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sctp_output.c

/*-
 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * a) Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * b) Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the distribution.
 *
 * c) Neither the name of Cisco Systems, Inc. nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

/* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $    */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/netinet/sctp_output.c,v 1.58.2.3 2007/12/09 20:23:47 rrs Exp $");

#include <netinet/sctp_os.h>
#include <sys/proc.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_input.h>



#define SCTP_MAX_GAPS_INARRAY 4
struct sack_track {
      uint8_t right_edge;     /* mergable on the right edge */
      uint8_t left_edge;      /* mergable on the left edge */
      uint8_t num_entries;
      uint8_t spare;
      struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
};

struct sack_track sack_array[256] = {
      {0, 0, 0, 0,            /* 0x00 */
            {{0, 0},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 1, 0,            /* 0x01 */
            {{0, 0},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x02 */
            {{1, 1},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 1, 0,            /* 0x03 */
            {{0, 1},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x04 */
            {{2, 2},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x05 */
            {{0, 0},
            {2, 2},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x06 */
            {{1, 2},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 1, 0,            /* 0x07 */
            {{0, 2},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x08 */
            {{3, 3},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x09 */
            {{0, 0},
            {3, 3},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x0a */
            {{1, 1},
            {3, 3},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x0b */
            {{0, 1},
            {3, 3},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x0c */
            {{2, 3},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x0d */
            {{0, 0},
            {2, 3},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x0e */
            {{1, 3},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 1, 0,            /* 0x0f */
            {{0, 3},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x10 */
            {{4, 4},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x11 */
            {{0, 0},
            {4, 4},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x12 */
            {{1, 1},
            {4, 4},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x13 */
            {{0, 1},
            {4, 4},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x14 */
            {{2, 2},
            {4, 4},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x15 */
            {{0, 0},
            {2, 2},
            {4, 4},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x16 */
            {{1, 2},
            {4, 4},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x17 */
            {{0, 2},
            {4, 4},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x18 */
            {{3, 4},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x19 */
            {{0, 0},
            {3, 4},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x1a */
            {{1, 1},
            {3, 4},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x1b */
            {{0, 1},
            {3, 4},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x1c */
            {{2, 4},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x1d */
            {{0, 0},
            {2, 4},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x1e */
            {{1, 4},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 1, 0,            /* 0x1f */
            {{0, 4},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x20 */
            {{5, 5},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x21 */
            {{0, 0},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x22 */
            {{1, 1},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x23 */
            {{0, 1},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x24 */
            {{2, 2},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x25 */
            {{0, 0},
            {2, 2},
            {5, 5},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x26 */
            {{1, 2},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x27 */
            {{0, 2},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x28 */
            {{3, 3},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x29 */
            {{0, 0},
            {3, 3},
            {5, 5},
            {0, 0}
            }
      },
      {0, 0, 3, 0,            /* 0x2a */
            {{1, 1},
            {3, 3},
            {5, 5},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x2b */
            {{0, 1},
            {3, 3},
            {5, 5},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x2c */
            {{2, 3},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x2d */
            {{0, 0},
            {2, 3},
            {5, 5},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x2e */
            {{1, 3},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x2f */
            {{0, 3},
            {5, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x30 */
            {{4, 5},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x31 */
            {{0, 0},
            {4, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x32 */
            {{1, 1},
            {4, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x33 */
            {{0, 1},
            {4, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x34 */
            {{2, 2},
            {4, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x35 */
            {{0, 0},
            {2, 2},
            {4, 5},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x36 */
            {{1, 2},
            {4, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x37 */
            {{0, 2},
            {4, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x38 */
            {{3, 5},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x39 */
            {{0, 0},
            {3, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x3a */
            {{1, 1},
            {3, 5},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x3b */
            {{0, 1},
            {3, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x3c */
            {{2, 5},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x3d */
            {{0, 0},
            {2, 5},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x3e */
            {{1, 5},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 1, 0,            /* 0x3f */
            {{0, 5},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x40 */
            {{6, 6},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x41 */
            {{0, 0},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x42 */
            {{1, 1},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x43 */
            {{0, 1},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x44 */
            {{2, 2},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x45 */
            {{0, 0},
            {2, 2},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x46 */
            {{1, 2},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x47 */
            {{0, 2},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x48 */
            {{3, 3},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x49 */
            {{0, 0},
            {3, 3},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 3, 0,            /* 0x4a */
            {{1, 1},
            {3, 3},
            {6, 6},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x4b */
            {{0, 1},
            {3, 3},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x4c */
            {{2, 3},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x4d */
            {{0, 0},
            {2, 3},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x4e */
            {{1, 3},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x4f */
            {{0, 3},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x50 */
            {{4, 4},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x51 */
            {{0, 0},
            {4, 4},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 3, 0,            /* 0x52 */
            {{1, 1},
            {4, 4},
            {6, 6},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x53 */
            {{0, 1},
            {4, 4},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 3, 0,            /* 0x54 */
            {{2, 2},
            {4, 4},
            {6, 6},
            {0, 0}
            }
      },
      {1, 0, 4, 0,            /* 0x55 */
            {{0, 0},
            {2, 2},
            {4, 4},
            {6, 6}
            }
      },
      {0, 0, 3, 0,            /* 0x56 */
            {{1, 2},
            {4, 4},
            {6, 6},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x57 */
            {{0, 2},
            {4, 4},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x58 */
            {{3, 4},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x59 */
            {{0, 0},
            {3, 4},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 3, 0,            /* 0x5a */
            {{1, 1},
            {3, 4},
            {6, 6},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x5b */
            {{0, 1},
            {3, 4},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x5c */
            {{2, 4},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x5d */
            {{0, 0},
            {2, 4},
            {6, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x5e */
            {{1, 4},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x5f */
            {{0, 4},
            {6, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x60 */
            {{5, 6},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x61 */
            {{0, 0},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x62 */
            {{1, 1},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x63 */
            {{0, 1},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x64 */
            {{2, 2},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x65 */
            {{0, 0},
            {2, 2},
            {5, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x66 */
            {{1, 2},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x67 */
            {{0, 2},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x68 */
            {{3, 3},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x69 */
            {{0, 0},
            {3, 3},
            {5, 6},
            {0, 0}
            }
      },
      {0, 0, 3, 0,            /* 0x6a */
            {{1, 1},
            {3, 3},
            {5, 6},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x6b */
            {{0, 1},
            {3, 3},
            {5, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x6c */
            {{2, 3},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x6d */
            {{0, 0},
            {2, 3},
            {5, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x6e */
            {{1, 3},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x6f */
            {{0, 3},
            {5, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x70 */
            {{4, 6},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x71 */
            {{0, 0},
            {4, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x72 */
            {{1, 1},
            {4, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x73 */
            {{0, 1},
            {4, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x74 */
            {{2, 2},
            {4, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 3, 0,            /* 0x75 */
            {{0, 0},
            {2, 2},
            {4, 6},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x76 */
            {{1, 2},
            {4, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x77 */
            {{0, 2},
            {4, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x78 */
            {{3, 6},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x79 */
            {{0, 0},
            {3, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 2, 0,            /* 0x7a */
            {{1, 1},
            {3, 6},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x7b */
            {{0, 1},
            {3, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x7c */
            {{2, 6},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 2, 0,            /* 0x7d */
            {{0, 0},
            {2, 6},
            {0, 0},
            {0, 0}
            }
      },
      {0, 0, 1, 0,            /* 0x7e */
            {{1, 6},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 0, 1, 0,            /* 0x7f */
            {{0, 6},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 1, 0,            /* 0x80 */
            {{7, 7},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0x81 */
            {{0, 0},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x82 */
            {{1, 1},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0x83 */
            {{0, 1},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x84 */
            {{2, 2},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x85 */
            {{0, 0},
            {2, 2},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x86 */
            {{1, 2},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0x87 */
            {{0, 2},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x88 */
            {{3, 3},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x89 */
            {{0, 0},
            {3, 3},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0x8a */
            {{1, 1},
            {3, 3},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x8b */
            {{0, 1},
            {3, 3},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x8c */
            {{2, 3},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x8d */
            {{0, 0},
            {2, 3},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x8e */
            {{1, 3},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0x8f */
            {{0, 3},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x90 */
            {{4, 4},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x91 */
            {{0, 0},
            {4, 4},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0x92 */
            {{1, 1},
            {4, 4},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x93 */
            {{0, 1},
            {4, 4},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0x94 */
            {{2, 2},
            {4, 4},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 4, 0,            /* 0x95 */
            {{0, 0},
            {2, 2},
            {4, 4},
            {7, 7}
            }
      },
      {0, 1, 3, 0,            /* 0x96 */
            {{1, 2},
            {4, 4},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x97 */
            {{0, 2},
            {4, 4},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x98 */
            {{3, 4},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x99 */
            {{0, 0},
            {3, 4},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0x9a */
            {{1, 1},
            {3, 4},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x9b */
            {{0, 1},
            {3, 4},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x9c */
            {{2, 4},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0x9d */
            {{0, 0},
            {2, 4},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0x9e */
            {{1, 4},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0x9f */
            {{0, 4},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xa0 */
            {{5, 5},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xa1 */
            {{0, 0},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xa2 */
            {{1, 1},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xa3 */
            {{0, 1},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xa4 */
            {{2, 2},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 4, 0,            /* 0xa5 */
            {{0, 0},
            {2, 2},
            {5, 5},
            {7, 7}
            }
      },
      {0, 1, 3, 0,            /* 0xa6 */
            {{1, 2},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xa7 */
            {{0, 2},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xa8 */
            {{3, 3},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 4, 0,            /* 0xa9 */
            {{0, 0},
            {3, 3},
            {5, 5},
            {7, 7}
            }
      },
      {0, 1, 4, 0,            /* 0xaa */
            {{1, 1},
            {3, 3},
            {5, 5},
            {7, 7}
            }
      },
      {1, 1, 4, 0,            /* 0xab */
            {{0, 1},
            {3, 3},
            {5, 5},
            {7, 7}
            }
      },
      {0, 1, 3, 0,            /* 0xac */
            {{2, 3},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 4, 0,            /* 0xad */
            {{0, 0},
            {2, 3},
            {5, 5},
            {7, 7}
            }
      },
      {0, 1, 3, 0,            /* 0xae */
            {{1, 3},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xaf */
            {{0, 3},
            {5, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xb0 */
            {{4, 5},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xb1 */
            {{0, 0},
            {4, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xb2 */
            {{1, 1},
            {4, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xb3 */
            {{0, 1},
            {4, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xb4 */
            {{2, 2},
            {4, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 4, 0,            /* 0xb5 */
            {{0, 0},
            {2, 2},
            {4, 5},
            {7, 7}
            }
      },
      {0, 1, 3, 0,            /* 0xb6 */
            {{1, 2},
            {4, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xb7 */
            {{0, 2},
            {4, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xb8 */
            {{3, 5},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xb9 */
            {{0, 0},
            {3, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xba */
            {{1, 1},
            {3, 5},
            {7, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xbb */
            {{0, 1},
            {3, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xbc */
            {{2, 5},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xbd */
            {{0, 0},
            {2, 5},
            {7, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xbe */
            {{1, 5},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xbf */
            {{0, 5},
            {7, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 1, 0,            /* 0xc0 */
            {{6, 7},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xc1 */
            {{0, 0},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xc2 */
            {{1, 1},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xc3 */
            {{0, 1},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xc4 */
            {{2, 2},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xc5 */
            {{0, 0},
            {2, 2},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xc6 */
            {{1, 2},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xc7 */
            {{0, 2},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xc8 */
            {{3, 3},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xc9 */
            {{0, 0},
            {3, 3},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xca */
            {{1, 1},
            {3, 3},
            {6, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xcb */
            {{0, 1},
            {3, 3},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xcc */
            {{2, 3},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xcd */
            {{0, 0},
            {2, 3},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xce */
            {{1, 3},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xcf */
            {{0, 3},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xd0 */
            {{4, 4},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xd1 */
            {{0, 0},
            {4, 4},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xd2 */
            {{1, 1},
            {4, 4},
            {6, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xd3 */
            {{0, 1},
            {4, 4},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xd4 */
            {{2, 2},
            {4, 4},
            {6, 7},
            {0, 0}
            }
      },
      {1, 1, 4, 0,            /* 0xd5 */
            {{0, 0},
            {2, 2},
            {4, 4},
            {6, 7}
            }
      },
      {0, 1, 3, 0,            /* 0xd6 */
            {{1, 2},
            {4, 4},
            {6, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xd7 */
            {{0, 2},
            {4, 4},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xd8 */
            {{3, 4},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xd9 */
            {{0, 0},
            {3, 4},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xda */
            {{1, 1},
            {3, 4},
            {6, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xdb */
            {{0, 1},
            {3, 4},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xdc */
            {{2, 4},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xdd */
            {{0, 0},
            {2, 4},
            {6, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xde */
            {{1, 4},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xdf */
            {{0, 4},
            {6, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 1, 0,            /* 0xe0 */
            {{5, 7},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xe1 */
            {{0, 0},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xe2 */
            {{1, 1},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xe3 */
            {{0, 1},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xe4 */
            {{2, 2},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xe5 */
            {{0, 0},
            {2, 2},
            {5, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xe6 */
            {{1, 2},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xe7 */
            {{0, 2},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xe8 */
            {{3, 3},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xe9 */
            {{0, 0},
            {3, 3},
            {5, 7},
            {0, 0}
            }
      },
      {0, 1, 3, 0,            /* 0xea */
            {{1, 1},
            {3, 3},
            {5, 7},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xeb */
            {{0, 1},
            {3, 3},
            {5, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xec */
            {{2, 3},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xed */
            {{0, 0},
            {2, 3},
            {5, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xee */
            {{1, 3},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xef */
            {{0, 3},
            {5, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 1, 0,            /* 0xf0 */
            {{4, 7},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xf1 */
            {{0, 0},
            {4, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xf2 */
            {{1, 1},
            {4, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xf3 */
            {{0, 1},
            {4, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xf4 */
            {{2, 2},
            {4, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 3, 0,            /* 0xf5 */
            {{0, 0},
            {2, 2},
            {4, 7},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xf6 */
            {{1, 2},
            {4, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xf7 */
            {{0, 2},
            {4, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 1, 0,            /* 0xf8 */
            {{3, 7},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xf9 */
            {{0, 0},
            {3, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 2, 0,            /* 0xfa */
            {{1, 1},
            {3, 7},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xfb */
            {{0, 1},
            {3, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 1, 0,            /* 0xfc */
            {{2, 7},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 2, 0,            /* 0xfd */
            {{0, 0},
            {2, 7},
            {0, 0},
            {0, 0}
            }
      },
      {0, 1, 1, 0,            /* 0xfe */
            {{1, 7},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      },
      {1, 1, 1, 0,            /* 0xff */
            {{0, 7},
            {0, 0},
            {0, 0},
            {0, 0}
            }
      }
};


int
sctp_is_address_in_scope(struct sctp_ifa *ifa,
    int ipv4_addr_legal,
    int ipv6_addr_legal,
    int loopback_scope,
    int ipv4_local_scope,
    int local_scope,
    int site_scope,
    int do_update)
{
      if ((loopback_scope == 0) &&
          (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
            /*
             * skip loopback if not in scope *
             */
            return (0);
      }
      if ((ifa->address.sa.sa_family == AF_INET) && ipv4_addr_legal) {
            struct sockaddr_in *sin;

            sin = (struct sockaddr_in *)&ifa->address.sin;
            if (sin->sin_addr.s_addr == 0) {
                  /* not in scope , unspecified */
                  return (0);
            }
            if ((ipv4_local_scope == 0) &&
                (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
                  /* private address not in scope */
                  return (0);
            }
      } else if ((ifa->address.sa.sa_family == AF_INET6) && ipv6_addr_legal) {
            struct sockaddr_in6 *sin6;

            /*
             * Must update the flags,  bummer, which means any IFA locks
             * must now be applied HERE <->
             */
            if (do_update) {
                  sctp_gather_internal_ifa_flags(ifa);
            }
            if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                  return (0);
            }
            /* ok to use deprecated addresses? */
            sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
            if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                  /* skip unspecifed addresses */
                  return (0);
            }
            if (        /* (local_scope == 0) && */
                (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
                  return (0);
            }
            if ((site_scope == 0) &&
                (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
                  return (0);
            }
      } else {
            return (0);
      }
      return (1);
}

static struct mbuf *
sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
{
      struct sctp_paramhdr *parmh;
      struct mbuf *mret;
      int len;

      if (ifa->address.sa.sa_family == AF_INET) {
            len = sizeof(struct sctp_ipv4addr_param);
      } else if (ifa->address.sa.sa_family == AF_INET6) {
            len = sizeof(struct sctp_ipv6addr_param);
      } else {
            /* unknown type */
            return (m);
      }
      if (M_TRAILINGSPACE(m) >= len) {
            /* easy side we just drop it on the end */
            parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
            mret = m;
      } else {
            /* Need more space */
            mret = m;
            while (SCTP_BUF_NEXT(mret) != NULL) {
                  mret = SCTP_BUF_NEXT(mret);
            }
            SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
            if (SCTP_BUF_NEXT(mret) == NULL) {
                  /* We are hosed, can't add more addresses */
                  return (m);
            }
            mret = SCTP_BUF_NEXT(mret);
            parmh = mtod(mret, struct sctp_paramhdr *);
      }
      /* now add the parameter */
      if (ifa->address.sa.sa_family == AF_INET) {
            struct sctp_ipv4addr_param *ipv4p;
            struct sockaddr_in *sin;

            sin = (struct sockaddr_in *)&ifa->address.sin;
            ipv4p = (struct sctp_ipv4addr_param *)parmh;
            parmh->param_type = htons(SCTP_IPV4_ADDRESS);
            parmh->param_length = htons(len);
            ipv4p->addr = sin->sin_addr.s_addr;
            SCTP_BUF_LEN(mret) += len;
      } else if (ifa->address.sa.sa_family == AF_INET6) {
            struct sctp_ipv6addr_param *ipv6p;
            struct sockaddr_in6 *sin6;

            sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
            ipv6p = (struct sctp_ipv6addr_param *)parmh;
            parmh->param_type = htons(SCTP_IPV6_ADDRESS);
            parmh->param_length = htons(len);
            memcpy(ipv6p->addr, &sin6->sin6_addr,
                sizeof(ipv6p->addr));
            /* clear embedded scope in the address */
            in6_clearscope((struct in6_addr *)ipv6p->addr);
            SCTP_BUF_LEN(mret) += len;
      } else {
            return (m);
      }
      return (mret);
}


struct mbuf *
sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
    struct mbuf *m_at, int cnt_inits_to)
{
      struct sctp_vrf *vrf = NULL;
      int cnt, limit_out = 0, total_count;
      uint32_t vrf_id;

      vrf_id = inp->def_vrf_id;
      SCTP_IPI_ADDR_RLOCK();
      vrf = sctp_find_vrf(vrf_id);
      if (vrf == NULL) {
            SCTP_IPI_ADDR_RUNLOCK();
            return (m_at);
      }
      if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
            struct sctp_ifa *sctp_ifap;
            struct sctp_ifn *sctp_ifnp;

            cnt = cnt_inits_to;
            if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
                  limit_out = 1;
                  cnt = SCTP_ADDRESS_LIMIT;
                  goto skip_count;
            }
            LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
                  if ((scope->loopback_scope == 0) &&
                      SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
                        /*
                         * Skip loopback devices if loopback_scope
                         * not set
                         */
                        continue;
                  }
                  LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
                        if (sctp_is_address_in_scope(sctp_ifap,
                            scope->ipv4_addr_legal,
                            scope->ipv6_addr_legal,
                            scope->loopback_scope,
                            scope->ipv4_local_scope,
                            scope->local_scope,
                            scope->site_scope, 1) == 0) {
                              continue;
                        }
                        cnt++;
                        if (cnt > SCTP_ADDRESS_LIMIT) {
                              break;
                        }
                  }
                  if (cnt > SCTP_ADDRESS_LIMIT) {
                        break;
                  }
            }
skip_count:
            if (cnt > 1) {
                  total_count = 0;
                  LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
                        cnt = 0;
                        if ((scope->loopback_scope == 0) &&
                            SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
                              /*
                               * Skip loopback devices if
                               * loopback_scope not set
                               */
                              continue;
                        }
                        LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
                              if (sctp_is_address_in_scope(sctp_ifap,
                                  scope->ipv4_addr_legal,
                                  scope->ipv6_addr_legal,
                                  scope->loopback_scope,
                                  scope->ipv4_local_scope,
                                  scope->local_scope,
                                  scope->site_scope, 0) == 0) {
                                    continue;
                              }
                              m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
                              if (limit_out) {
                                    cnt++;
                                    total_count++;
                                    if (cnt >= 2) {
                                          /*
                                           * two from each
                                           * address
                                           */
                                          break;
                                    }
                                    if (total_count > SCTP_ADDRESS_LIMIT) {
                                          /* No more addresses */
                                          break;
                                    }
                              }
                        }
                  }
            }
      } else {
            struct sctp_laddr *laddr;

            cnt = cnt_inits_to;
            /* First, how many ? */
            LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                  if (laddr->ifa == NULL) {
                        continue;
                  }
                  if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
                        /*
                         * Address being deleted by the system, dont
                         * list.
                         */
                        continue;
                  if (laddr->action == SCTP_DEL_IP_ADDRESS) {
                        /*
                         * Address being deleted on this ep don't
                         * list.
                         */
                        continue;
                  }
                  if (sctp_is_address_in_scope(laddr->ifa,
                      scope->ipv4_addr_legal,
                      scope->ipv6_addr_legal,
                      scope->loopback_scope,
                      scope->ipv4_local_scope,
                      scope->local_scope,
                      scope->site_scope, 1) == 0) {
                        continue;
                  }
                  cnt++;
            }
            if (cnt > SCTP_ADDRESS_LIMIT) {
                  limit_out = 1;
            }
            /*
             * To get through a NAT we only list addresses if we have
             * more than one. That way if you just bind a single address
             * we let the source of the init dictate our address.
             */
            if (cnt > 1) {
                  LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                        cnt = 0;
                        if (laddr->ifa == NULL) {
                              continue;
                        }
                        if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
                              continue;

                        if (sctp_is_address_in_scope(laddr->ifa,
                            scope->ipv4_addr_legal,
                            scope->ipv6_addr_legal,
                            scope->loopback_scope,
                            scope->ipv4_local_scope,
                            scope->local_scope,
                            scope->site_scope, 0) == 0) {
                              continue;
                        }
                        m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
                        cnt++;
                        if (cnt >= SCTP_ADDRESS_LIMIT) {
                              break;
                        }
                  }
            }
      }
      SCTP_IPI_ADDR_RUNLOCK();
      return (m_at);
}

static struct sctp_ifa *
sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
    uint8_t dest_is_loop,
    uint8_t dest_is_priv,
    sa_family_t fam)
{
      uint8_t dest_is_global = 0;

      /* dest_is_priv is true if destination is a private address */
      /* dest_is_loop is true if destination is a loopback addresses */

      /*
       * Here we determine if its a preferred address. A preferred address
       * means it is the same scope or higher scope then the destination.
       * L = loopback, P = private, G = global
       * ----------------------------------------- src    |  dest | result
       * ---------------------------------------- L     |    L  |    yes
       * ----------------------------------------- P     |    L  |
       * yes-v4 no-v6 ----------------------------------------- G     |
       * L  |    yes-v4 no-v6 ----------------------------------------- L
       * |    P  |    no ----------------------------------------- P     |
       * P  |    yes ----------------------------------------- G     |
       * P  |    no ----------------------------------------- L     |    G
       * |    no ----------------------------------------- P     |    G  |
       * no ----------------------------------------- G     |    G  |
       * yes -----------------------------------------
       */

      if (ifa->address.sa.sa_family != fam) {
            /* forget mis-matched family */
            return (NULL);
      }
      if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
            dest_is_global = 1;
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
      SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
      /* Ok the address may be ok */
      if (fam == AF_INET6) {
            /* ok to use deprecated addresses? */
            if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                  SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
                  return (NULL);
            }
            if (ifa->src_is_priv) {
                  if (dest_is_loop) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
                        return (NULL);
                  }
            }
            if (ifa->src_is_glob) {
                  if (dest_is_loop) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
                        return (NULL);
                  }
            }
      }
      /*
       * Now that we know what is what, implement or table this could in
       * theory be done slicker (it used to be), but this is
       * straightforward and easier to validate :-)
       */
      SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
          ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
      SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
          dest_is_loop, dest_is_priv, dest_is_global);

      if ((ifa->src_is_loop) && (dest_is_priv)) {
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
            return (NULL);
      }
      if ((ifa->src_is_glob) && (dest_is_priv)) {
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
            return (NULL);
      }
      if ((ifa->src_is_loop) && (dest_is_global)) {
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
            return (NULL);
      }
      if ((ifa->src_is_priv) && (dest_is_global)) {
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
            return (NULL);
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
      /* its a preferred address */
      return (ifa);
}

static struct sctp_ifa *
sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
    uint8_t dest_is_loop,
    uint8_t dest_is_priv,
    sa_family_t fam)
{
      uint8_t dest_is_global = 0;


      /*
       * Here we determine if its a acceptable address. A acceptable
       * address means it is the same scope or higher scope but we can
       * allow for NAT which means its ok to have a global dest and a
       * private src.
       * 
       * L = loopback, P = private, G = global
       * ----------------------------------------- src    |  dest | result
       * ----------------------------------------- L     |   L   |    yes
       * ----------------------------------------- P     |   L   |
       * yes-v4 no-v6 ----------------------------------------- G     |
       * L   |    yes ----------------------------------------- L     |
       * P   |    no ----------------------------------------- P     |   P
       * |    yes ----------------------------------------- G     |   P
       * |    yes - May not work -----------------------------------------
       * L     |   G   |    no ----------------------------------------- P
       * |   G   |    yes - May not work
       * ----------------------------------------- G     |   G   |    yes
       * -----------------------------------------
       */

      if (ifa->address.sa.sa_family != fam) {
            /* forget non matching family */
            return (NULL);
      }
      /* Ok the address may be ok */
      if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
            dest_is_global = 1;
      }
      if (fam == AF_INET6) {
            /* ok to use deprecated addresses? */
            if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                  return (NULL);
            }
            if (ifa->src_is_priv) {
                  /* Special case, linklocal to loop */
                  if (dest_is_loop)
                        return (NULL);
            }
      }
      /*
       * Now that we know what is what, implement our table. This could in
       * theory be done slicker (it used to be), but this is
       * straightforward and easier to validate :-)
       */
      if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
            return (NULL);
      }
      if ((ifa->src_is_loop == 1) && (dest_is_global)) {
            return (NULL);
      }
      /* its an acceptable address */
      return (ifa);
}

int
sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
{
      struct sctp_laddr *laddr;

      if (stcb == NULL) {
            /* There are no restrictions, no TCB :-) */
            return (0);
      }
      LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
            if (laddr->ifa == NULL) {
                  SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
                      __FUNCTION__);
                  continue;
            }
            if (laddr->ifa == ifa) {
                  /* Yes it is on the list */
                  return (1);
            }
      }
      return (0);
}


int
sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
{
      struct sctp_laddr *laddr;

      if (ifa == NULL)
            return (0);
      LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
            if (laddr->ifa == NULL) {
                  SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
                      __FUNCTION__);
                  continue;
            }
            if ((laddr->ifa == ifa) && laddr->action == 0)
                  /* same pointer */
                  return (1);
      }
      return (0);
}



static struct sctp_ifa *
sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
    sctp_route_t * ro,
    uint32_t vrf_id,
    int non_asoc_addr_ok,
    uint8_t dest_is_priv,
    uint8_t dest_is_loop,
    sa_family_t fam)
{
      struct sctp_laddr *laddr, *starting_point;
      void *ifn;
      int resettotop = 0;
      struct sctp_ifn *sctp_ifn;
      struct sctp_ifa *sctp_ifa, *sifa;
      struct sctp_vrf *vrf;
      uint32_t ifn_index;

      vrf = sctp_find_vrf(vrf_id);
      if (vrf == NULL)
            return (NULL);

      ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
      ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
      sctp_ifn = sctp_find_ifn(ifn, ifn_index);
      /*
       * first question, is the ifn we will emit on in our list, if so, we
       * want such an address. Note that we first looked for a preferred
       * address.
       */
      if (sctp_ifn) {
            /* is a preferred one on the interface we route out? */
            LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                  if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
                      (non_asoc_addr_ok == 0))
                        continue;
                  sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
                      dest_is_loop,
                      dest_is_priv, fam);
                  if (sifa == NULL)
                        continue;
                  if (sctp_is_addr_in_ep(inp, sifa)) {
                        atomic_add_int(&sifa->refcount, 1);
                        return (sifa);
                  }
            }
      }
      /*
       * ok, now we now need to find one on the list of the addresses. We
       * can't get one on the emitting interface so let's find first a
       * preferred one. If not that an acceptable one otherwise... we
       * return NULL.
       */
      starting_point = inp->next_addr_touse;
once_again:
      if (inp->next_addr_touse == NULL) {
            inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
            resettotop = 1;
      }
      for (laddr = inp->next_addr_touse; laddr;
          laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
            if (laddr->ifa == NULL) {
                  /* address has been removed */
                  continue;
            }
            if (laddr->action == SCTP_DEL_IP_ADDRESS) {
                  /* address is being deleted */
                  continue;
            }
            sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
                dest_is_priv, fam);
            if (sifa == NULL)
                  continue;
            atomic_add_int(&sifa->refcount, 1);
            return (sifa);
      }
      if (resettotop == 0) {
            inp->next_addr_touse = NULL;
            goto once_again;
      }
      inp->next_addr_touse = starting_point;
      resettotop = 0;
once_again_too:
      if (inp->next_addr_touse == NULL) {
            inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
            resettotop = 1;
      }
      /* ok, what about an acceptable address in the inp */
      for (laddr = inp->next_addr_touse; laddr;
          laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
            if (laddr->ifa == NULL) {
                  /* address has been removed */
                  continue;
            }
            if (laddr->action == SCTP_DEL_IP_ADDRESS) {
                  /* address is being deleted */
                  continue;
            }
            sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
                dest_is_priv, fam);
            if (sifa == NULL)
                  continue;
            atomic_add_int(&sifa->refcount, 1);
            return (sifa);
      }
      if (resettotop == 0) {
            inp->next_addr_touse = NULL;
            goto once_again_too;
      }
      /*
       * no address bound can be a source for the destination we are in
       * trouble
       */
      return (NULL);
}



static struct sctp_ifa *
sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    struct sctp_nets *net,
    sctp_route_t * ro,
    uint32_t vrf_id,
    uint8_t dest_is_priv,
    uint8_t dest_is_loop,
    int non_asoc_addr_ok,
    sa_family_t fam)
{
      struct sctp_laddr *laddr, *starting_point;
      void *ifn;
      struct sctp_ifn *sctp_ifn;
      struct sctp_ifa *sctp_ifa, *sifa;
      uint8_t start_at_beginning = 0;
      struct sctp_vrf *vrf;
      uint32_t ifn_index;

      /*
       * first question, is the ifn we will emit on in our list, if so, we
       * want that one.
       */
      vrf = sctp_find_vrf(vrf_id);
      if (vrf == NULL)
            return (NULL);

      ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
      ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
      sctp_ifn = sctp_find_ifn(ifn, ifn_index);

      /*
       * first question, is the ifn we will emit on in our list?  If so,
       * we want that one. First we look for a preferred. Second, we go
       * for an acceptable.
       */
      if (sctp_ifn) {
            /* first try for a preferred address on the ep */
            LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                  if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
                        continue;
                  if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
                        sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
                        if (sifa == NULL)
                              continue;
                        if ((non_asoc_addr_ok == 0) &&
                            (sctp_is_addr_restricted(stcb, sifa))) {
                              /* on the no-no list */
                              continue;
                        }
                        atomic_add_int(&sifa->refcount, 1);
                        return (sifa);
                  }
            }
            /* next try for an acceptable address on the ep */
            LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                  if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
                        continue;
                  if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
                        sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
                        if (sifa == NULL)
                              continue;
                        if ((non_asoc_addr_ok == 0) &&
                            (sctp_is_addr_restricted(stcb, sifa))) {
                              /* on the no-no list */
                              continue;
                        }
                        atomic_add_int(&sifa->refcount, 1);
                        return (sifa);
                  }
            }

      }
      /*
       * if we can't find one like that then we must look at all addresses
       * bound to pick one at first preferable then secondly acceptable.
       */
      starting_point = stcb->asoc.last_used_address;
sctp_from_the_top:
      if (stcb->asoc.last_used_address == NULL) {
            start_at_beginning = 1;
            stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
      }
      /* search beginning with the last used address */
      for (laddr = stcb->asoc.last_used_address; laddr;
          laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
            if (laddr->ifa == NULL) {
                  /* address has been removed */
                  continue;
            }
            if (laddr->action == SCTP_DEL_IP_ADDRESS) {
                  /* address is being deleted */
                  continue;
            }
            sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
            if (sifa == NULL)
                  continue;
            if ((non_asoc_addr_ok == 0) &&
                (sctp_is_addr_restricted(stcb, sifa))) {
                  /* on the no-no list */
                  continue;
            }
            stcb->asoc.last_used_address = laddr;
            atomic_add_int(&sifa->refcount, 1);
            return (sifa);
      }
      if (start_at_beginning == 0) {
            stcb->asoc.last_used_address = NULL;
            goto sctp_from_the_top;
      }
      /* now try for any higher scope than the destination */
      stcb->asoc.last_used_address = starting_point;
      start_at_beginning = 0;
sctp_from_the_top2:
      if (stcb->asoc.last_used_address == NULL) {
            start_at_beginning = 1;
            stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
      }
      /* search beginning with the last used address */
      for (laddr = stcb->asoc.last_used_address; laddr;
          laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
            if (laddr->ifa == NULL) {
                  /* address has been removed */
                  continue;
            }
            if (laddr->action == SCTP_DEL_IP_ADDRESS) {
                  /* address is being deleted */
                  continue;
            }
            sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
                dest_is_priv, fam);
            if (sifa == NULL)
                  continue;
            if ((non_asoc_addr_ok == 0) &&
                (sctp_is_addr_restricted(stcb, sifa))) {
                  /* on the no-no list */
                  continue;
            }
            stcb->asoc.last_used_address = laddr;
            atomic_add_int(&sifa->refcount, 1);
            return (sifa);
      }
      if (start_at_beginning == 0) {
            stcb->asoc.last_used_address = NULL;
            goto sctp_from_the_top2;
      }
      return (NULL);
}

static struct sctp_ifa *
sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
    struct sctp_tcb *stcb,
    int non_asoc_addr_ok,
    uint8_t dest_is_loop,
    uint8_t dest_is_priv,
    int addr_wanted,
    sa_family_t fam,
    sctp_route_t * ro
)
{
      struct sctp_ifa *ifa, *sifa;
      int num_eligible_addr = 0;

      LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
            if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
                (non_asoc_addr_ok == 0))
                  continue;
            sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
                dest_is_priv, fam);
            if (sifa == NULL)
                  continue;
            /*
             * Check if the IPv6 address matches to next-hop. In the
             * mobile case, old IPv6 address may be not deleted from the
             * interface. Then, the interface has previous and new
             * addresses.  We should use one corresponding to the
             * next-hop.  (by micchie)
             */
            if (stcb && fam == AF_INET6 &&
                sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
                  if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
                      == 0) {
                        continue;
                  }
            }
            /* Avoid topologically incorrect IPv4 address */
            if (stcb && fam == AF_INET &&
                sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
                  if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
                        continue;
                  }
            }
            if (stcb) {
                  if ((non_asoc_addr_ok == 0) &&
                      sctp_is_addr_restricted(stcb, sifa)) {
                        /*
                         * It is restricted for some reason..
                         * probably not yet added.
                         */
                        continue;
                  }
            }
            if (num_eligible_addr >= addr_wanted) {
                  return (sifa);
            }
            num_eligible_addr++;
      }
      return (NULL);
}


static int
sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
    struct sctp_tcb *stcb,
    int non_asoc_addr_ok,
    uint8_t dest_is_loop,
    uint8_t dest_is_priv,
    sa_family_t fam)
{
      struct sctp_ifa *ifa, *sifa;
      int num_eligible_addr = 0;

      LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
            if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
                (non_asoc_addr_ok == 0)) {
                  continue;
            }
            sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
                dest_is_priv, fam);
            if (sifa == NULL) {
                  continue;
            }
            if (stcb) {
                  if ((non_asoc_addr_ok == 0) &&
                      sctp_is_addr_restricted(stcb, sifa)) {
                        /*
                         * It is restricted for some reason..
                         * probably not yet added.
                         */
                        continue;
                  }
            }
            num_eligible_addr++;
      }
      return (num_eligible_addr);
}

static struct sctp_ifa *
sctp_choose_boundall(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    struct sctp_nets *net,
    sctp_route_t * ro,
    uint32_t vrf_id,
    uint8_t dest_is_priv,
    uint8_t dest_is_loop,
    int non_asoc_addr_ok,
    sa_family_t fam)
{
      int cur_addr_num = 0, num_preferred = 0;
      void *ifn;
      struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
      struct sctp_ifa *sctp_ifa, *sifa;
      uint32_t ifn_index;
      struct sctp_vrf *vrf;

      /*-
       * For boundall we can use any address in the association.
       * If non_asoc_addr_ok is set we can use any address (at least in
       * theory). So we look for preferred addresses first. If we find one,
       * we use it. Otherwise we next try to get an address on the
       * interface, which we should be able to do (unless non_asoc_addr_ok
       * is false and we are routed out that way). In these cases where we
       * can't use the address of the interface we go through all the
       * ifn's looking for an address we can use and fill that in. Punting
       * means we send back address 0, which will probably cause problems
       * actually since then IP will fill in the address of the route ifn,
       * which means we probably already rejected it.. i.e. here comes an
       * abort :-<.
       */
      vrf = sctp_find_vrf(vrf_id);
      if (vrf == NULL)
            return (NULL);

      ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
      ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
      emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
      if (sctp_ifn == NULL) {
            /* ?? We don't have this guy ?? */
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
            goto bound_all_plan_b;
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
          ifn_index, sctp_ifn->ifn_name);

      if (net) {
            cur_addr_num = net->indx_of_eligible_next_to_use;
      }
      num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
          stcb,
          non_asoc_addr_ok,
          dest_is_loop,
          dest_is_priv, fam);
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
          num_preferred, sctp_ifn->ifn_name);
      if (num_preferred == 0) {
            /*
             * no eligible addresses, we must use some other interface
             * address if we can find one.
             */
            goto bound_all_plan_b;
      }
      /*
       * Ok we have num_eligible_addr set with how many we can use, this
       * may vary from call to call due to addresses being deprecated
       * etc..
       */
      if (cur_addr_num >= num_preferred) {
            cur_addr_num = 0;
      }
      /*
       * select the nth address from the list (where cur_addr_num is the
       * nth) and 0 is the first one, 1 is the second one etc...
       */
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);

      sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
          dest_is_priv, cur_addr_num, fam, ro);

      /* if sctp_ifa is NULL something changed??, fall to plan b. */
      if (sctp_ifa) {
            atomic_add_int(&sctp_ifa->refcount, 1);
            if (net) {
                  /* save off where the next one we will want */
                  net->indx_of_eligible_next_to_use = cur_addr_num + 1;
            }
            return (sctp_ifa);
      }
      /*
       * plan_b: Look at all interfaces and find a preferred address. If
       * no preferred fall through to plan_c.
       */
bound_all_plan_b:
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
      LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
                sctp_ifn->ifn_name);
            if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
                  /* wrong base scope */
                  SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
                  continue;
            }
            if ((sctp_ifn == looked_at) && looked_at) {
                  /* already looked at this guy */
                  SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
                  continue;
            }
            num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
                dest_is_loop, dest_is_priv, fam);
            SCTPDBG(SCTP_DEBUG_OUTPUT2,
                "Found ifn:%p %d preferred source addresses\n",
                ifn, num_preferred);
            if (num_preferred == 0) {
                  /* None on this interface. */
                  SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
                  continue;
            }
            SCTPDBG(SCTP_DEBUG_OUTPUT2,
                "num preferred:%d on interface:%p cur_addr_num:%d\n",
                num_preferred, sctp_ifn, cur_addr_num);

            /*
             * Ok we have num_eligible_addr set with how many we can
             * use, this may vary from call to call due to addresses
             * being deprecated etc..
             */
            if (cur_addr_num >= num_preferred) {
                  cur_addr_num = 0;
            }
            sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
                dest_is_priv, cur_addr_num, fam, ro);
            if (sifa == NULL)
                  continue;
            if (net) {
                  net->indx_of_eligible_next_to_use = cur_addr_num + 1;
                  SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
                      cur_addr_num);
                  SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
                  SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
                  SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
                  SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
            }
            atomic_add_int(&sifa->refcount, 1);
            return (sifa);

      }

      /* plan_c: do we have an acceptable address on the emit interface */
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
      if (emit_ifn == NULL) {
            goto plan_d;
      }
      LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
            if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
                (non_asoc_addr_ok == 0))
                  continue;
            sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
                dest_is_priv, fam);
            if (sifa == NULL)
                  continue;
            if (stcb) {
                  if ((non_asoc_addr_ok == 0) &&
                      sctp_is_addr_restricted(stcb, sifa)) {
                        /*
                         * It is restricted for some reason..
                         * probably not yet added.
                         */
                        continue;
                  }
            }
            atomic_add_int(&sifa->refcount, 1);
            return (sifa);
      }
plan_d:
      /*
       * plan_d: We are in trouble. No preferred address on the emit
       * interface. And not even a preferred address on all interfaces. Go
       * out and see if we can find an acceptable address somewhere
       * amongst all interfaces.
       */
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
      LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
            if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
                  /* wrong base scope */
                  continue;
            }
            if ((sctp_ifn == looked_at) && looked_at)
                  /* already looked at this guy */
                  continue;

            LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                  if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
                      (non_asoc_addr_ok == 0))
                        continue;
                  sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
                      dest_is_loop,
                      dest_is_priv, fam);
                  if (sifa == NULL)
                        continue;
                  if (stcb) {
                        if ((non_asoc_addr_ok == 0) &&
                            sctp_is_addr_restricted(stcb, sifa)) {
                              /*
                               * It is restricted for some
                               * reason.. probably not yet added.
                               */
                              continue;
                        }
                  }
                  atomic_add_int(&sifa->refcount, 1);
                  return (sifa);
            }
      }
      /*
       * Ok we can find NO address to source from that is not on our
       * restricted list and non_asoc_address is NOT ok, or it is on our
       * restricted list. We can't source to it :-(
       */
      return (NULL);
}



/* tcb may be NULL */
struct sctp_ifa *
sctp_source_address_selection(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    sctp_route_t * ro,
    struct sctp_nets *net,
    int non_asoc_addr_ok, uint32_t vrf_id)
{
      struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
      struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
      struct sctp_ifa *answer;
      uint8_t dest_is_priv, dest_is_loop;
      sa_family_t fam;

      /*-
       * Rules: - Find the route if needed, cache if I can. - Look at
       * interface address in route, Is it in the bound list. If so we
       * have the best source. - If not we must rotate amongst the
       * addresses.
       *
       * Cavets and issues
       *
       * Do we need to pay attention to scope. We can have a private address
       * or a global address we are sourcing or sending to. So if we draw
       * it out
       * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
       * For V4
         *------------------------------------------
       *      source     *      dest  *  result
       * -----------------------------------------
       * <a>  Private    *    Global  *  NAT
       * -----------------------------------------
       * <b>  Private    *    Private *  No problem
       * -----------------------------------------
         * <c>  Global     *    Private *  Huh, How will this work?
       * -----------------------------------------
         * <d>  Global     *    Global  *  No Problem
         *------------------------------------------
       * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
       * For V6
         *------------------------------------------
       *      source     *      dest  *  result
       * -----------------------------------------
       * <a>  Linklocal  *    Global  *
       * -----------------------------------------
       * <b>  Linklocal  * Linklocal  *  No problem
       * -----------------------------------------
         * <c>  Global     * Linklocal  *  Huh, How will this work?
       * -----------------------------------------
         * <d>  Global     *    Global  *  No Problem
         *------------------------------------------
       * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
         *
       * And then we add to that what happens if there are multiple addresses
       * assigned to an interface. Remember the ifa on a ifn is a linked
       * list of addresses. So one interface can have more than one IP
       * address. What happens if we have both a private and a global
       * address? Do we then use context of destination to sort out which
       * one is best? And what about NAT's sending P->G may get you a NAT
       * translation, or should you select the G thats on the interface in
       * preference.
       *
       * Decisions:
       *
       * - count the number of addresses on the interface.
         * - if it is one, no problem except case <c>.
         *   For <a> we will assume a NAT out there.
       * - if there are more than one, then we need to worry about scope P
       *   or G. We should prefer G -> G and P -> P if possible.
       *   Then as a secondary fall back to mixed types G->P being a last
       *   ditch one.
         * - The above all works for bound all, but bound specific we need to
       *   use the same concept but instead only consider the bound
       *   addresses. If the bound set is NOT assigned to the interface then
       *   we must use rotation amongst the bound addresses..
       */
      if (ro->ro_rt == NULL) {
            /*
             * Need a route to cache.
             */
            SCTP_RTALLOC(ro, vrf_id);
      }
      if (ro->ro_rt == NULL) {
            return (NULL);
      }
      fam = to->sin_family;
      dest_is_priv = dest_is_loop = 0;
      /* Setup our scopes for the destination */
      if (fam == AF_INET) {
            /* Scope based on outbound address */
            if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
                  dest_is_priv = 1;
            } else if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
                  dest_is_loop = 1;
                  if (net != NULL) {
                        /* mark it as local */
                        net->addr_is_local = 1;
                  }
            }
      } else if (fam == AF_INET6) {
            /* Scope based on outbound address */
            if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
                  /*
                   * If the route goes to the loopback address OR the
                   * address is a loopback address, we are loopback
                   * scope. But we don't use dest_is_priv (link local
                   * addresses).
                   */
                  dest_is_loop = 1;
                  if (net != NULL) {
                        /* mark it as local */
                        net->addr_is_local = 1;
                  }
            } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
                  dest_is_priv = 1;
            }
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
      SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
      SCTP_IPI_ADDR_RLOCK();
      if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
            /*
             * Bound all case
             */
            answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
                dest_is_priv, dest_is_loop,
                non_asoc_addr_ok, fam);
            SCTP_IPI_ADDR_RUNLOCK();
            return (answer);
      }
      /*
       * Subset bound case
       */
      if (stcb) {
            answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
                vrf_id, dest_is_priv,
                dest_is_loop,
                non_asoc_addr_ok, fam);
      } else {
            answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
                non_asoc_addr_ok,
                dest_is_priv,
                dest_is_loop, fam);
      }
      SCTP_IPI_ADDR_RUNLOCK();
      return (answer);
}

static int
sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
{
      struct cmsghdr cmh;
      int tlen, at;

      tlen = SCTP_BUF_LEN(control);
      at = 0;
      /*
       * Independent of how many mbufs, find the c_type inside the control
       * structure and copy out the data.
       */
      while (at < tlen) {
            if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
                  /* not enough room for one more we are done. */
                  return (0);
            }
            m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
            if (((int)cmh.cmsg_len + at) > tlen) {
                  /*
                   * this is real messed up since there is not enough
                   * data here to cover the cmsg header. We are done.
                   */
                  return (0);
            }
            if ((cmh.cmsg_level == IPPROTO_SCTP) &&
                (c_type == cmh.cmsg_type)) {
                  /* found the one we want, copy it out */
                  at += CMSG_ALIGN(sizeof(struct cmsghdr));
                  if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
                        /*
                         * space of cmsg_len after header not big
                         * enough
                         */
                        return (0);
                  }
                  m_copydata(control, at, cpsize, data);
                  return (1);
            } else {
                  at += CMSG_ALIGN(cmh.cmsg_len);
                  if (cmh.cmsg_len == 0) {
                        break;
                  }
            }
      }
      /* not found */
      return (0);
}

static struct mbuf *
sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
{
      struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
      struct sctp_state_cookie *stc;
      struct sctp_paramhdr *ph;
      uint8_t *foo;
      int sig_offset;
      uint16_t cookie_sz;

      mret = NULL;
      mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
          sizeof(struct sctp_paramhdr)), 0,
          M_DONTWAIT, 1, MT_DATA);
      if (mret == NULL) {
            return (NULL);
      }
      copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
      if (copy_init == NULL) {
            sctp_m_freem(mret);
            return (NULL);
      }
      copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
          M_DONTWAIT);
      if (copy_initack == NULL) {
            sctp_m_freem(mret);
            sctp_m_freem(copy_init);
            return (NULL);
      }
      /* easy side we just drop it on the end */
      ph = mtod(mret, struct sctp_paramhdr *);
      SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
          sizeof(struct sctp_paramhdr);
      stc = (struct sctp_state_cookie *)((caddr_t)ph +
          sizeof(struct sctp_paramhdr));
      ph->param_type = htons(SCTP_STATE_COOKIE);
      ph->param_length = 0;   /* fill in at the end */
      /* Fill in the stc cookie data */
      memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));

      /* tack the INIT and then the INIT-ACK onto the chain */
      cookie_sz = 0;
      m_at = mret;
      for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
            cookie_sz += SCTP_BUF_LEN(m_at);
            if (SCTP_BUF_NEXT(m_at) == NULL) {
                  SCTP_BUF_NEXT(m_at) = copy_init;
                  break;
            }
      }

      for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
            cookie_sz += SCTP_BUF_LEN(m_at);
            if (SCTP_BUF_NEXT(m_at) == NULL) {
                  SCTP_BUF_NEXT(m_at) = copy_initack;
                  break;
            }
      }

      for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
            cookie_sz += SCTP_BUF_LEN(m_at);
            if (SCTP_BUF_NEXT(m_at) == NULL) {
                  break;
            }
      }
      sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
      if (sig == NULL) {
            /* no space, so free the entire chain */
            sctp_m_freem(mret);
            return (NULL);
      }
      SCTP_BUF_LEN(sig) = 0;
      SCTP_BUF_NEXT(m_at) = sig;
      sig_offset = 0;
      foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
      memset(foo, 0, SCTP_SIGNATURE_SIZE);
      *signature = foo;
      SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
      cookie_sz += SCTP_SIGNATURE_SIZE;
      ph->param_length = htons(cookie_sz);
      return (mret);
}


static uint8_t
sctp_get_ect(struct sctp_tcb *stcb,
    struct sctp_tmit_chunk *chk)
{
      uint8_t this_random;

      /* Huh? */
      if (sctp_ecn_enable == 0)
            return (0);

      if (sctp_ecn_nonce == 0)
            /* no nonce, always return ECT0 */
            return (SCTP_ECT0_BIT);

      if (stcb->asoc.peer_supports_ecn_nonce == 0) {
            /* Peer does NOT support it, so we send a ECT0 only */
            return (SCTP_ECT0_BIT);
      }
      if (chk == NULL)
            return (SCTP_ECT0_BIT);

      if ((stcb->asoc.hb_random_idx > 3) ||
          ((stcb->asoc.hb_random_idx == 3) &&
          (stcb->asoc.hb_ect_randombit > 7))) {
            uint32_t rndval;

warp_drive_sa:
            rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
            memcpy(stcb->asoc.hb_random_values, &rndval,
                sizeof(stcb->asoc.hb_random_values));
            this_random = stcb->asoc.hb_random_values[0];
            stcb->asoc.hb_random_idx = 0;
            stcb->asoc.hb_ect_randombit = 0;
      } else {
            if (stcb->asoc.hb_ect_randombit > 7) {
                  stcb->asoc.hb_ect_randombit = 0;
                  stcb->asoc.hb_random_idx++;
                  if (stcb->asoc.hb_random_idx > 3) {
                        goto warp_drive_sa;
                  }
            }
            this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
      }
      if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
            if (chk != NULL)
                  /* ECN Nonce stuff */
                  chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
            stcb->asoc.hb_ect_randombit++;
            return (SCTP_ECT1_BIT);
      } else {
            stcb->asoc.hb_ect_randombit++;
            return (SCTP_ECT0_BIT);
      }
}

static int
sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,    /* may be NULL */
    struct sctp_nets *net,
    struct sockaddr *to,
    struct mbuf *m,
    uint32_t auth_offset,
    struct sctp_auth_chunk *auth,
    int nofragment_flag,
    int ecn_ok,
    struct sctp_tmit_chunk *chk,
    int out_of_asoc_ok,
    int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
)
/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
{
      /*
       * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
       * header WITH an SCTPHDR but no IP header, endpoint inp and sa
       * structure: - fill in the HMAC digest of any AUTH chunk in the
       * packet. - calculate and fill in the SCTP checksum. - prepend an
       * IP address header. - if boundall use INADDR_ANY. - if
       * boundspecific do source address selection. - set fragmentation
       * option for ipV4. - On return from IP output, check/adjust mtu
       * size of output interface and smallest_mtu size as well.
       */
      /* Will need ifdefs around this */
      struct mbuf *o_pak;
      struct mbuf *newm;
      struct sctphdr *sctphdr;
      int packet_length;
      uint32_t csum;
      int ret;
      uint32_t vrf_id;
      sctp_route_t *ro = NULL;

      if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
            SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
            sctp_m_freem(m);
            return (EFAULT);
      }
      if (stcb) {
            vrf_id = stcb->asoc.vrf_id;
      } else {
            vrf_id = inp->def_vrf_id;
      }

      /* fill in the HMAC digest for any AUTH chunk in the packet */
      if ((auth != NULL) && (stcb != NULL)) {
            sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb);
      }
      /* Calculate the csum and fill in the length of the packet */
      sctphdr = mtod(m, struct sctphdr *);
      if (sctp_no_csum_on_loopback &&
          (stcb) &&
          (to->sa_family == AF_INET) &&
          (stcb->asoc.loopback_scope)) {
            sctphdr->checksum = 0;
            /*
             * This can probably now be taken out since my audit shows
             * no more bad pktlen's coming in. But we will wait a while
             * yet.
             */
            packet_length = sctp_calculate_len(m);
      } else {
            sctphdr->checksum = 0;
            csum = sctp_calculate_sum(m, &packet_length, 0);
            sctphdr->checksum = csum;
      }

      if (to->sa_family == AF_INET) {
            struct ip *ip = NULL;
            sctp_route_t iproute;
            uint8_t tos_value;

            newm = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
            if (newm == NULL) {
                  sctp_m_freem(m);
                  SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                  return (ENOMEM);
            }
            SCTP_ALIGN_TO_END(newm, sizeof(struct ip));
            SCTP_BUF_LEN(newm) = sizeof(struct ip);
            packet_length += sizeof(struct ip);
            SCTP_BUF_NEXT(newm) = m;
            m = newm;
            ip = mtod(m, struct ip *);
            ip->ip_v = IPVERSION;
            ip->ip_hl = (sizeof(struct ip) >> 2);
            if (net) {
                  tos_value = net->tos_flowlabel & 0x000000ff;
            } else {
                  tos_value = inp->ip_inp.inp.inp_ip_tos;
            }
            if (nofragment_flag) {
#if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__)
                  ip->ip_off = IP_DF;
#else
                  ip->ip_off = htons(IP_DF);
#endif
            } else
                  ip->ip_off = 0;

            /* FreeBSD has a function for ip_id's */
            ip->ip_id = ip_newid();

            ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
            ip->ip_len = packet_length;
            if (stcb) {
                  if ((stcb->asoc.ecn_allowed) && ecn_ok) {
                        /* Enable ECN */
                        ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
                  } else {
                        /* No ECN */
                        ip->ip_tos = (u_char)(tos_value & 0xfc);
                  }
            } else {
                  /* no association at all */
                  ip->ip_tos = (tos_value & 0xfc);
            }
            ip->ip_p = IPPROTO_SCTP;
            ip->ip_sum = 0;
            if (net == NULL) {
                  ro = &iproute;
                  memset(&iproute, 0, sizeof(iproute));
                  memcpy(&ro->ro_dst, to, to->sa_len);
            } else {
                  ro = (sctp_route_t *) & net->ro;
            }
            /* Now the address selection part */
            ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;

            /* call the routine to select the src address */
            if (net) {
                  if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
                        sctp_free_ifa(net->ro._s_addr);
                        net->ro._s_addr = NULL;
                        net->src_addr_selected = 0;
                        if (ro->ro_rt) {
                              RTFREE(ro->ro_rt);
                              ro->ro_rt = NULL;
                        }
                  }
                  if (net->src_addr_selected == 0) {
                        if (out_of_asoc_ok) {
                              /* do not cache */
                              goto temp_v4_src;
                        }
                        /* Cache the source address */
                        net->ro._s_addr = sctp_source_address_selection(inp, stcb,
                            ro, net, out_of_asoc_ok,
                            vrf_id);
                        net->src_addr_selected = 1;
                  }
                  if (net->ro._s_addr == NULL) {
                        /* No route to host */
                        net->src_addr_selected = 0;
                        goto no_route;
                  }
                  ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
            } else {
                  struct sctp_ifa *_lsrc;

      temp_v4_src:
                  _lsrc = sctp_source_address_selection(inp, stcb, ro,
                      net,
                      out_of_asoc_ok,
                      vrf_id);
                  if (_lsrc == NULL) {
                        goto no_route;
                  }
                  ip->ip_src = _lsrc->address.sin.sin_addr;
                  sctp_free_ifa(_lsrc);
            }

            /*
             * If source address selection fails and we find no route
             * then the ip_output should fail as well with a
             * NO_ROUTE_TO_HOST type error. We probably should catch
             * that somewhere and abort the association right away
             * (assuming this is an INIT being sent).
             */
            if ((ro->ro_rt == NULL)) {
                  /*
                   * src addr selection failed to find a route (or
                   * valid source addr), so we can't get there from
                   * here (yet)!
                   */
      no_route:
                  SCTPDBG(SCTP_DEBUG_OUTPUT1,
                      "%s: dropped packet - no valid source addr\n",
                      __FUNCTION__);
                  if (net) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1,
                            "Destination was ");
                        SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
                            &net->ro._l_addr.sa);
                        if (net->dest_state & SCTP_ADDR_CONFIRMED) {
                              if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
                                    SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
                                    sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
                                        stcb,
                                        SCTP_FAILED_THRESHOLD,
                                        (void *)net,
                                        so_locked);
                                    net->dest_state &= ~SCTP_ADDR_REACHABLE;
                                    net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
                                    /*
                                     * JRS 5/14/07 - If a
                                     * destination is
                                     * unreachable, the PF bit
                                     * is turned off.  This
                                     * allows an unambiguous use
                                     * of the PF bit for
                                     * destinations that are
                                     * reachable but potentially
                                     * failed. If the
                                     * destination is set to the
                                     * unreachable state, also
                                     * set the destination to
                                     * the PF state.
                                     */
                                    /*
                                     * Add debug message here if
                                     * destination is not in PF
                                     * state.
                                     */
                                    /*
                                     * Stop any running T3
                                     * timers here?
                                     */
                                    if (sctp_cmt_on_off && sctp_cmt_pf) {
                                          net->dest_state &= ~SCTP_ADDR_PF;
                                          SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
                                              net);
                                    }
                              }
                        }
                        if (stcb) {
                              if (net == stcb->asoc.primary_destination) {
                                    /* need a new primary */
                                    struct sctp_nets *alt;

                                    alt = sctp_find_alternate_net(stcb, net, 0);
                                    if (alt != net) {
                                          if (sctp_set_primary_addr(stcb,
                                              (struct sockaddr *)NULL,
                                              alt) == 0) {
                                                net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
                                                if (net->ro._s_addr) {
                                                      sctp_free_ifa(net->ro._s_addr);
                                                      net->ro._s_addr = NULL;
                                                }
                                                net->src_addr_selected = 0;
                                          }
                                    }
                              }
                        }
                  }
                  SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
                  sctp_m_freem(m);
                  return (EHOSTUNREACH);
            }
            if (ro != &iproute) {
                  memcpy(&iproute, ro, sizeof(*ro));
            }
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
                (uint32_t) (ntohl(ip->ip_src.s_addr)));
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
                (uint32_t) (ntohl(ip->ip_dst.s_addr)));
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
                ro->ro_rt);

            if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
                  /* failed to prepend data, give up */
                  SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                  sctp_m_freem(m);
                  return (ENOMEM);
            }
#ifdef  SCTP_PACKET_LOGGING
            if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
                  sctp_packet_log(m, packet_length);
#endif
            SCTP_ATTACH_CHAIN(o_pak, m, packet_length);

            /* send it out.  table id is taken from stcb */
            SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);

            SCTP_STAT_INCR(sctps_sendpackets);
            SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
            if (ret)
                  SCTP_STAT_INCR(sctps_senderrors);

            SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
            if (net == NULL) {
                  /* free tempy routes */
                  if (ro->ro_rt) {
                        RTFREE(ro->ro_rt);
                        ro->ro_rt = NULL;
                  }
            } else {
                  /* PMTU check versus smallest asoc MTU goes here */
                  if ((ro->ro_rt != NULL) &&
                      (net->ro._s_addr)) {
                        uint32_t mtu;

                        mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
                        if (mtu &&
                            (stcb->asoc.smallest_mtu > mtu)) {
#ifdef SCTP_PRINT_FOR_B_AND_M
                              SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n",
                                  mtu);
#endif
                              sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
                              net->mtu = mtu;
                        }
                  } else if (ro->ro_rt == NULL) {
                        /* route was freed */
                        if (net->ro._s_addr &&
                            net->src_addr_selected) {
                              sctp_free_ifa(net->ro._s_addr);
                              net->ro._s_addr = NULL;
                        }
                        net->src_addr_selected = 0;
                  }
            }
            return (ret);
      }
#ifdef INET6
      else if (to->sa_family == AF_INET6) {
            uint32_t flowlabel;
            struct ip6_hdr *ip6h;
            struct route_in6 ip6route;
            struct ifnet *ifp;
            u_char flowTop;
            uint16_t flowBottom;
            u_char tosBottom, tosTop;
            struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
            int prev_scope = 0;
            struct sockaddr_in6 lsa6_storage;
            int error;
            u_short prev_port = 0;

            if (net != NULL) {
                  flowlabel = net->tos_flowlabel;
            } else {
                  flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
            }

            newm = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
            if (newm == NULL) {
                  sctp_m_freem(m);
                  SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                  return (ENOMEM);
            }
            SCTP_ALIGN_TO_END(newm, sizeof(struct ip6_hdr));
            SCTP_BUF_LEN(newm) = sizeof(struct ip6_hdr);
            packet_length += sizeof(struct ip6_hdr);
            SCTP_BUF_NEXT(newm) = m;
            m = newm;

            ip6h = mtod(m, struct ip6_hdr *);
            /*
             * We assume here that inp_flow is in host byte order within
             * the TCB!
             */
            flowBottom = flowlabel & 0x0000ffff;
            flowTop = ((flowlabel & 0x000f0000) >> 16);
            tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
            /* protect *sin6 from overwrite */
            sin6 = (struct sockaddr_in6 *)to;
            tmp = *sin6;
            sin6 = &tmp;

            /* KAME hack: embed scopeid */
            if (sa6_embedscope(sin6, ip6_use_defzone) != 0) {
                  SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  return (EINVAL);
            }
            if (net == NULL) {
                  memset(&ip6route, 0, sizeof(ip6route));
                  ro = (sctp_route_t *) & ip6route;
                  memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
            } else {
                  ro = (sctp_route_t *) & net->ro;
            }
            if (stcb != NULL) {
                  if ((stcb->asoc.ecn_allowed) && ecn_ok) {
                        /* Enable ECN */
                        tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
                  } else {
                        /* No ECN */
                        tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
                  }
            } else {
                  /* we could get no asoc if it is a O-O-T-B packet */
                  tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
            }
            ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
            ip6h->ip6_nxt = IPPROTO_SCTP;
            ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
            ip6h->ip6_dst = sin6->sin6_addr;

            /*
             * Add SRC address selection here: we can only reuse to a
             * limited degree the kame src-addr-sel, since we can try
             * their selection but it may not be bound.
             */
            bzero(&lsa6_tmp, sizeof(lsa6_tmp));
            lsa6_tmp.sin6_family = AF_INET6;
            lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
            lsa6 = &lsa6_tmp;
            if (net) {
                  if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
                        sctp_free_ifa(net->ro._s_addr);
                        net->ro._s_addr = NULL;
                        net->src_addr_selected = 0;
                        if (ro->ro_rt) {
                              RTFREE(ro->ro_rt);
                              ro->ro_rt = NULL;
                        }
                  }
                  if (net->src_addr_selected == 0) {
                        if (out_of_asoc_ok) {
                              /* do not cache */
                              goto temp_v6_src;
                        }
                        /* Cache the source address */
                        net->ro._s_addr = sctp_source_address_selection(inp,
                            stcb,
                            ro,
                            net,
                            out_of_asoc_ok,
                            vrf_id);
                        net->src_addr_selected = 1;
                  }
                  if (net->ro._s_addr == NULL) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
                        net->src_addr_selected = 0;
                        goto no_route;
                  }
                  lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
            } else {
                  struct sctp_ifa *_lsrc;

      temp_v6_src:
                  _lsrc = sctp_source_address_selection(inp, stcb, ro,
                      net,
                      out_of_asoc_ok,
                      vrf_id);
                  if (_lsrc == NULL) {
                        goto no_route;
                  }
                  lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
                  sctp_free_ifa(_lsrc);
            }
            lsa6->sin6_port = inp->sctp_lport;

            if ((ro->ro_rt == NULL)) {
                  /*
                   * src addr selection failed to find a route (or
                   * valid source addr), so we can't get there from
                   * here!
                   */
                  goto no_route;
            }
            /*
             * XXX: sa6 may not have a valid sin6_scope_id in the
             * non-SCOPEDROUTING case.
             */
            bzero(&lsa6_storage, sizeof(lsa6_storage));
            lsa6_storage.sin6_family = AF_INET6;
            lsa6_storage.sin6_len = sizeof(lsa6_storage);
            if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
                  SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
                  sctp_m_freem(m);
                  return (error);
            }
            /* XXX */
            lsa6_storage.sin6_addr = lsa6->sin6_addr;
            lsa6_storage.sin6_port = inp->sctp_lport;
            lsa6 = &lsa6_storage;
            ip6h->ip6_src = lsa6->sin6_addr;

            /*
             * We set the hop limit now since there is a good chance
             * that our ro pointer is now filled
             */
            ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
            ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);

#ifdef SCTP_DEBUG
            /* Copy to be sure something bad is not happening */
            sin6->sin6_addr = ip6h->ip6_dst;
            lsa6->sin6_addr = ip6h->ip6_src;
#endif

            SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
            SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
            SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
            if (net) {
                  sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
                  /* preserve the port and scope for link local send */
                  prev_scope = sin6->sin6_scope_id;
                  prev_port = sin6->sin6_port;
            }
            if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
                  /* failed to prepend data, give up */
                  sctp_m_freem(m);
                  SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                  return (ENOMEM);
            }
#ifdef  SCTP_PACKET_LOGGING
            if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
                  sctp_packet_log(m, packet_length);
#endif
            SCTP_ATTACH_CHAIN(o_pak, m, packet_length);

            /* send it out. table id is taken from stcb */
            SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp,
                stcb, vrf_id);

            if (net) {
                  /* for link local this must be done */
                  sin6->sin6_scope_id = prev_scope;
                  sin6->sin6_port = prev_port;
            }
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
            SCTP_STAT_INCR(sctps_sendpackets);
            SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
            if (ret) {
                  SCTP_STAT_INCR(sctps_senderrors);
            }
            if (net == NULL) {
                  /* Now if we had a temp route free it */
                  if (ro->ro_rt) {
                        RTFREE(ro->ro_rt);
                  }
            } else {
                  /* PMTU check versus smallest asoc MTU goes here */
                  if (ro->ro_rt == NULL) {
                        /* Route was freed */
                        if (net->ro._s_addr &&
                            net->src_addr_selected) {
                              sctp_free_ifa(net->ro._s_addr);
                              net->ro._s_addr = NULL;
                        }
                        net->src_addr_selected = 0;
                  }
                  if ((ro->ro_rt != NULL) &&
                      (net->ro._s_addr)) {
                        uint32_t mtu;

                        mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
                        if (mtu &&
                            (stcb->asoc.smallest_mtu > mtu)) {
#ifdef SCTP_PRINT_FOR_B_AND_M
                              SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
                                  mtu);
#endif
                              sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
                              net->mtu = mtu;
                        }
                  } else if (ifp) {
                        if (ND_IFINFO(ifp)->linkmtu &&
                            (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
#ifdef SCTP_PRINT_FOR_B_AND_M
                              SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
                                  ND_IFINFO(ifp)->linkmtu);
#endif
                              sctp_mtu_size_reset(inp,
                                  &stcb->asoc,
                                  ND_IFINFO(ifp)->linkmtu);
                        }
                  }
            }
            return (ret);
      }
#endif
      else {
            SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
                ((struct sockaddr *)to)->sa_family);
            sctp_m_freem(m);
            SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
            return (EFAULT);
      }
}


void
sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
)
{
      struct mbuf *m, *m_at, *mp_last;
      struct sctp_nets *net;
      struct sctp_init_msg *initm;
      struct sctp_supported_addr_param *sup_addr;
      struct sctp_ecn_supported_param *ecn;
      struct sctp_prsctp_supported_param *prsctp;
      struct sctp_ecn_nonce_supported_param *ecn_nonce;
      struct sctp_supported_chunk_types_param *pr_supported;
      int cnt_inits_to = 0;
      int padval, ret;
      int num_ext;
      int p_len;

      /* INIT's always go to the primary (and usually ONLY address) */
      mp_last = NULL;
      net = stcb->asoc.primary_destination;
      if (net == NULL) {
            net = TAILQ_FIRST(&stcb->asoc.nets);
            if (net == NULL) {
                  /* TSNH */
                  return;
            }
            /* we confirm any address we send an INIT to */
            net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
            (void)sctp_set_primary_addr(stcb, NULL, net);
      } else {
            /* we confirm any address we send an INIT to */
            net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
      if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
            /*
             * special hook, if we are sending to link local it will not
             * show up in our private address count.
             */
            struct sockaddr_in6 *sin6l;

            sin6l = &net->ro._l_addr.sin6;
            if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
                  cnt_inits_to = 1;
      }
      if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
            /* This case should not happen */
            SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
            return;
      }
      /* start the INIT timer */
      sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);

      m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
      if (m == NULL) {
            /* No memory, INIT timer will re-attempt. */
            SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
            return;
      }
      SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
      /*
       * assume peer supports asconf in order to be able to queue local
       * address changes while an INIT is in flight and before the assoc
       * is established.
       */
      stcb->asoc.peer_supports_asconf = 1;
      /* Now lets put the SCTP header in place */
      initm = mtod(m, struct sctp_init_msg *);
      initm->sh.src_port = inp->sctp_lport;
      initm->sh.dest_port = stcb->rport;
      initm->sh.v_tag = 0;
      initm->sh.checksum = 0; /* calculate later */
      /* now the chunk header */
      initm->msg.ch.chunk_type = SCTP_INITIATION;
      initm->msg.ch.chunk_flags = 0;
      /* fill in later from mbuf we build */
      initm->msg.ch.chunk_length = 0;
      /* place in my tag */
      initm->msg.init.initiate_tag = htonl(stcb->asoc.my_vtag);
      /* set up some of the credits. */
      initm->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(inp->sctp_socket),
          SCTP_MINIMAL_RWND));

      initm->msg.init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
      initm->msg.init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
      initm->msg.init.initial_tsn = htonl(stcb->asoc.init_seq_number);
      /* now the address restriction */
      sup_addr = (struct sctp_supported_addr_param *)((caddr_t)initm +
          sizeof(*initm));
      sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
      /* we support 2 types IPv6/IPv4 */
      sup_addr->ph.param_length = htons(sizeof(*sup_addr) +
          sizeof(uint16_t));
      sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
      sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
      SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);

      if (inp->sctp_ep.adaptation_layer_indicator) {
            struct sctp_adaptation_layer_indication *ali;

            ali = (struct sctp_adaptation_layer_indication *)(
                (caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
            ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
            ali->ph.param_length = htons(sizeof(*ali));
            ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
            SCTP_BUF_LEN(m) += sizeof(*ali);
            ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
                sizeof(*ali));
      } else {
            ecn = (struct sctp_ecn_supported_param *)((caddr_t)sup_addr +
                sizeof(*sup_addr) + sizeof(uint16_t));
      }

      /* now any cookie time extensions */
      if (stcb->asoc.cookie_preserve_req) {
            struct sctp_cookie_perserve_param *cookie_preserve;

            cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
            cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
            cookie_preserve->ph.param_length = htons(
                sizeof(*cookie_preserve));
            cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
            SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
            ecn = (struct sctp_ecn_supported_param *)(
                (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
            stcb->asoc.cookie_preserve_req = 0;
      }
      /* ECN parameter */
      if (sctp_ecn_enable == 1) {
            ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
            ecn->ph.param_length = htons(sizeof(*ecn));
            SCTP_BUF_LEN(m) += sizeof(*ecn);
            prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
                sizeof(*ecn));
      } else {
            prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
      }
      /* And now tell the peer we do pr-sctp */
      prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
      prsctp->ph.param_length = htons(sizeof(*prsctp));
      SCTP_BUF_LEN(m) += sizeof(*prsctp);

      /* And now tell the peer we do all the extensions */
      pr_supported = (struct sctp_supported_chunk_types_param *)
          ((caddr_t)prsctp + sizeof(*prsctp));
      pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
      num_ext = 0;
      pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
      pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
      pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
      pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
      pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
      if (!sctp_auth_disable)
            pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
      p_len = sizeof(*pr_supported) + num_ext;
      pr_supported->ph.param_length = htons(p_len);
      bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
      SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);

      /* ECN nonce: And now tell the peer we support ECN nonce */
      if (sctp_ecn_nonce) {
            ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
                ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
            ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
            ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
            SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
      }
      /* add authentication parameters */
      if (!sctp_auth_disable) {
            struct sctp_auth_random *randp;
            struct sctp_auth_hmac_algo *hmacs;
            struct sctp_auth_chunk_list *chunks;

            /* attach RANDOM parameter, if available */
            if (stcb->asoc.authinfo.random != NULL) {
                  randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
                  p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
#ifdef SCTP_AUTH_DRAFT_04
                  randp->ph.param_type = htons(SCTP_RANDOM);
                  randp->ph.param_length = htons(p_len);
                  bcopy(stcb->asoc.authinfo.random->key,
                      randp->random_data,
                      stcb->asoc.authinfo.random_len);
#else
                  /* random key already contains the header */
                  bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
#endif
                  /* zero out any padding required */
                  bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
                  SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
            }
            /* add HMAC_ALGO parameter */
            hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
            p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
                (uint8_t *) hmacs->hmac_ids);
            if (p_len > 0) {
                  p_len += sizeof(*hmacs);
                  hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
                  hmacs->ph.param_length = htons(p_len);
                  /* zero out any padding required */
                  bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
                  SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
            }
            /* add CHUNKS parameter */
            chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
            p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
                chunks->chunk_types);
            if (p_len > 0) {
                  p_len += sizeof(*chunks);
                  chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
                  chunks->ph.param_length = htons(p_len);
                  /* zero out any padding required */
                  bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
                  SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
            }
      }
      m_at = m;
      /* now the addresses */
      {
            struct sctp_scoping scp;

            /*
             * To optimize this we could put the scoping stuff into a
             * structure and remove the individual uint8's from the
             * assoc structure. Then we could just sifa in the address
             * within the stcb.. but for now this is a quick hack to get
             * the address stuff teased apart.
             */
            scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
            scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
            scp.loopback_scope = stcb->asoc.loopback_scope;
            scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
            scp.local_scope = stcb->asoc.local_scope;
            scp.site_scope = stcb->asoc.site_scope;

            m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
      }

      /* calulate the size and update pkt header and chunk header */
      p_len = 0;
      for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
            if (SCTP_BUF_NEXT(m_at) == NULL)
                  mp_last = m_at;
            p_len += SCTP_BUF_LEN(m_at);
      }
      initm->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
      /*
       * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
       * here since the timer will drive a retranmission.
       */

      /* I don't expect this to execute but we will be safe here */
      padval = p_len % 4;
      if ((padval) && (mp_last)) {
            /*
             * The compiler worries that mp_last may not be set even
             * though I think it is impossible :-> however we add
             * mp_last here just in case.
             */
            ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
            if (ret) {
                  /* Houston we have a problem, no space */
                  sctp_m_freem(m);
                  return;
            }
            p_len += padval;
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
      ret = sctp_lowlevel_chunk_output(inp, stcb, net,
          (struct sockaddr *)&net->ro._l_addr,
          m, 0, NULL, 0, 0, NULL, 0, so_locked);
      SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
      SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
      sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
      (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
}

struct mbuf *
sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp)
{
      /*
       * Given a mbuf containing an INIT or INIT-ACK with the param_offset
       * being equal to the beginning of the params i.e. (iphlen +
       * sizeof(struct sctp_init_msg) parse through the parameters to the
       * end of the mbuf verifying that all parameters are known.
       * 
       * For unknown parameters build and return a mbuf with
       * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
       * processing this chunk stop, and set *abort_processing to 1.
       * 
       * By having param_offset be pre-set to where parameters begin it is
       * hoped that this routine may be reused in the future by new
       * features.
       */
      struct sctp_paramhdr *phdr, params;

      struct mbuf *mat, *op_err;
      char tempbuf[SCTP_PARAM_BUFFER_SIZE];
      int at, limit, pad_needed;
      uint16_t ptype, plen, padded_size;
      int err_at;

      *abort_processing = 0;
      mat = in_initpkt;
      err_at = 0;
      limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
      at = param_offset;
      op_err = NULL;
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
      phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
      while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
            ptype = ntohs(phdr->param_type);
            plen = ntohs(phdr->param_length);
            if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
                  /* wacked parameter */
                  SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
                  goto invalid_size;
            }
            limit -= SCTP_SIZE32(plen);
            /*-
             * All parameters for all chunks that we know/understand are
             * listed here. We process them other places and make
             * appropriate stop actions per the upper bits. However this
             * is the generic routine processor's can call to get back
             * an operr.. to either incorporate (init-ack) or send.
             */
            padded_size = SCTP_SIZE32(plen);
            switch (ptype) {
                  /* Param's with variable size */
            case SCTP_HEARTBEAT_INFO:
            case SCTP_STATE_COOKIE:
            case SCTP_UNRECOG_PARAM:
            case SCTP_ERROR_CAUSE_IND:
                  /* ok skip fwd */
                  at += padded_size;
                  break;
                  /* Param's with variable size within a range */
            case SCTP_CHUNK_LIST:
            case SCTP_SUPPORTED_CHUNK_EXT:
                  if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_SUPPORTED_ADDRTYPE:
                  if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_RANDOM:
                  if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_SET_PRIM_ADDR:
            case SCTP_DEL_IP_ADDRESS:
            case SCTP_ADD_IP_ADDRESS:
                  if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
                      (padded_size != sizeof(struct sctp_asconf_addr_param))) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
                  /* Param's with a fixed size */
            case SCTP_IPV4_ADDRESS:
                  if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_IPV6_ADDRESS:
                  if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_COOKIE_PRESERVE:
                  if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_ECN_NONCE_SUPPORTED:
            case SCTP_PRSCTP_SUPPORTED:
                  if (padded_size != sizeof(struct sctp_paramhdr)) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_ECN_CAPABLE:
                  if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_ULP_ADAPTATION:
                  if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_SUCCESS_REPORT:
                  if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
                        goto invalid_size;
                  }
                  at += padded_size;
                  break;
            case SCTP_HOSTNAME_ADDRESS:
                  {
                        /* We can NOT handle HOST NAME addresses!! */
                        int l_len;

                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
                        *abort_processing = 1;
                        if (op_err == NULL) {
                              /* Ok need to try to get a mbuf */
                              l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
                              l_len += plen;
                              l_len += sizeof(struct sctp_paramhdr);
                              op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
                              if (op_err) {
                                    SCTP_BUF_LEN(op_err) = 0;
                                    /*
                                     * pre-reserve space for ip
                                     * and sctp header  and
                                     * chunk hdr
                                     */
                                    SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
                                    SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
                                    SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
                              }
                        }
                        if (op_err) {
                              /* If we have space */
                              struct sctp_paramhdr s;

                              if (err_at % 4) {
                                    uint32_t cpthis = 0;

                                    pad_needed = 4 - (err_at % 4);
                                    m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
                                    err_at += pad_needed;
                              }
                              s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
                              s.param_length = htons(sizeof(s) + plen);
                              m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
                              err_at += sizeof(s);
                              phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
                              if (phdr == NULL) {
                                    sctp_m_freem(op_err);
                                    /*
                                     * we are out of memory but
                                     * we still need to have a
                                     * look at what to do (the
                                     * system is in trouble
                                     * though).
                                     */
                                    return (NULL);
                              }
                              m_copyback(op_err, err_at, plen, (caddr_t)phdr);
                              err_at += plen;
                        }
                        return (op_err);
                        break;
                  }
            default:
                  /*
                   * we do not recognize the parameter figure out what
                   * we do.
                   */
                  SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
                  if ((ptype & 0x4000) == 0x4000) {
                        /* Report bit is set?? */
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
                        if (op_err == NULL) {
                              int l_len;

                              /* Ok need to try to get an mbuf */
                              l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
                              l_len += plen;
                              l_len += sizeof(struct sctp_paramhdr);
                              op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
                              if (op_err) {
                                    SCTP_BUF_LEN(op_err) = 0;
                                    SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
                                    SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
                                    SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
                              }
                        }
                        if (op_err) {
                              /* If we have space */
                              struct sctp_paramhdr s;

                              if (err_at % 4) {
                                    uint32_t cpthis = 0;

                                    pad_needed = 4 - (err_at % 4);
                                    m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
                                    err_at += pad_needed;
                              }
                              s.param_type = htons(SCTP_UNRECOG_PARAM);
                              s.param_length = htons(sizeof(s) + plen);
                              m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
                              err_at += sizeof(s);
                              if (plen > sizeof(tempbuf)) {
                                    plen = sizeof(tempbuf);
                              }
                              phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
                              if (phdr == NULL) {
                                    sctp_m_freem(op_err);
                                    /*
                                     * we are out of memory but
                                     * we still need to have a
                                     * look at what to do (the
                                     * system is in trouble
                                     * though).
                                     */
                                    op_err = NULL;
                                    goto more_processing;
                              }
                              m_copyback(op_err, err_at, plen, (caddr_t)phdr);
                              err_at += plen;
                        }
                  }
      more_processing:
                  if ((ptype & 0x8000) == 0x0000) {
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
                        return (op_err);
                  } else {
                        /* skip this chunk and continue processing */
                        SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
                        at += SCTP_SIZE32(plen);
                  }
                  break;

            }
            phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
      }
      return (op_err);
invalid_size:
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
      *abort_processing = 1;
      if ((op_err == NULL) && phdr) {
            int l_len;

            l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
            l_len += (2 * sizeof(struct sctp_paramhdr));
            op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
            if (op_err) {
                  SCTP_BUF_LEN(op_err) = 0;
                  SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
                  SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
                  SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
            }
      }
      if ((op_err) && phdr) {
            struct sctp_paramhdr s;

            if (err_at % 4) {
                  uint32_t cpthis = 0;

                  pad_needed = 4 - (err_at % 4);
                  m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
                  err_at += pad_needed;
            }
            s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
            s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
            m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
            err_at += sizeof(s);
            /* Only copy back the p-hdr that caused the issue */
            m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
      }
      return (op_err);
}

static int
sctp_are_there_new_addresses(struct sctp_association *asoc,
    struct mbuf *in_initpkt, int iphlen, int offset)
{
      /*
       * Given a INIT packet, look through the packet to verify that there
       * are NO new addresses. As we go through the parameters add reports
       * of any un-understood parameters that require an error.  Also we
       * must return (1) to drop the packet if we see a un-understood
       * parameter that tells us to drop the chunk.
       */
      struct sockaddr_in sin4, *sa4;
      struct sockaddr_in6 sin6, *sa6;
      struct sockaddr *sa_touse;
      struct sockaddr *sa;
      struct sctp_paramhdr *phdr, params;
      struct ip *iph;
      struct mbuf *mat;
      uint16_t ptype, plen;
      int err_at;
      uint8_t fnd;
      struct sctp_nets *net;

      memset(&sin4, 0, sizeof(sin4));
      memset(&sin6, 0, sizeof(sin6));
      sin4.sin_family = AF_INET;
      sin4.sin_len = sizeof(sin4);
      sin6.sin6_family = AF_INET6;
      sin6.sin6_len = sizeof(sin6);

      sa_touse = NULL;
      /* First what about the src address of the pkt ? */
      iph = mtod(in_initpkt, struct ip *);
      if (iph->ip_v == IPVERSION) {
            /* source addr is IPv4 */
            sin4.sin_addr = iph->ip_src;
            sa_touse = (struct sockaddr *)&sin4;
      } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
            /* source addr is IPv6 */
            struct ip6_hdr *ip6h;

            ip6h = mtod(in_initpkt, struct ip6_hdr *);
            sin6.sin6_addr = ip6h->ip6_src;
            sa_touse = (struct sockaddr *)&sin6;
      } else {
            return (1);
      }

      fnd = 0;
      TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
            sa = (struct sockaddr *)&net->ro._l_addr;
            if (sa->sa_family == sa_touse->sa_family) {
                  if (sa->sa_family == AF_INET) {
                        sa4 = (struct sockaddr_in *)sa;
                        if (sa4->sin_addr.s_addr ==
                            sin4.sin_addr.s_addr) {
                              fnd = 1;
                              break;
                        }
                  } else if (sa->sa_family == AF_INET6) {
                        sa6 = (struct sockaddr_in6 *)sa;
                        if (SCTP6_ARE_ADDR_EQUAL(&sa6->sin6_addr,
                            &sin6.sin6_addr)) {
                              fnd = 1;
                              break;
                        }
                  }
            }
      }
      if (fnd == 0) {
            /* New address added! no need to look futher. */
            return (1);
      }
      /* Ok so far lets munge through the rest of the packet */
      mat = in_initpkt;
      err_at = 0;
      sa_touse = NULL;
      offset += sizeof(struct sctp_init_chunk);
      phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
      while (phdr) {
            ptype = ntohs(phdr->param_type);
            plen = ntohs(phdr->param_length);
            if (ptype == SCTP_IPV4_ADDRESS) {
                  struct sctp_ipv4addr_param *p4, p4_buf;

                  phdr = sctp_get_next_param(mat, offset,
                      (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
                  if (plen != sizeof(struct sctp_ipv4addr_param) ||
                      phdr == NULL) {
                        return (1);
                  }
                  p4 = (struct sctp_ipv4addr_param *)phdr;
                  sin4.sin_addr.s_addr = p4->addr;
                  sa_touse = (struct sockaddr *)&sin4;
            } else if (ptype == SCTP_IPV6_ADDRESS) {
                  struct sctp_ipv6addr_param *p6, p6_buf;

                  phdr = sctp_get_next_param(mat, offset,
                      (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
                  if (plen != sizeof(struct sctp_ipv6addr_param) ||
                      phdr == NULL) {
                        return (1);
                  }
                  p6 = (struct sctp_ipv6addr_param *)phdr;
                  memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
                      sizeof(p6->addr));
                  sa_touse = (struct sockaddr *)&sin4;
            }
            if (sa_touse) {
                  /* ok, sa_touse points to one to check */
                  fnd = 0;
                  TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
                        sa = (struct sockaddr *)&net->ro._l_addr;
                        if (sa->sa_family != sa_touse->sa_family) {
                              continue;
                        }
                        if (sa->sa_family == AF_INET) {
                              sa4 = (struct sockaddr_in *)sa;
                              if (sa4->sin_addr.s_addr ==
                                  sin4.sin_addr.s_addr) {
                                    fnd = 1;
                                    break;
                              }
                        } else if (sa->sa_family == AF_INET6) {
                              sa6 = (struct sockaddr_in6 *)sa;
                              if (SCTP6_ARE_ADDR_EQUAL(
                                  &sa6->sin6_addr, &sin6.sin6_addr)) {
                                    fnd = 1;
                                    break;
                              }
                        }
                  }
                  if (!fnd) {
                        /* New addr added! no need to look further */
                        return (1);
                  }
            }
            offset += SCTP_SIZE32(plen);
            phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
      }
      return (0);
}

/*
 * Given a MBUF chain that was sent into us containing an INIT. Build a
 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
 * message (i.e. the struct sctp_init_msg).
 */
void
sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
    struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
    struct sctp_init_chunk *init_chk, uint32_t vrf_id, int hold_inp_lock)
{
      struct sctp_association *asoc;
      struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
      struct sctp_init_msg *initackm_out;
      struct sctp_ecn_supported_param *ecn;
      struct sctp_prsctp_supported_param *prsctp;
      struct sctp_ecn_nonce_supported_param *ecn_nonce;
      struct sctp_supported_chunk_types_param *pr_supported;
      struct sockaddr_storage store;
      struct sockaddr_in *sin;
      struct sockaddr_in6 *sin6;
      sctp_route_t *ro;
      struct ip *iph;
      struct ip6_hdr *ip6;
      struct sockaddr *to;
      struct sctp_state_cookie stc;
      struct sctp_nets *net = NULL;
      uint8_t *signature = NULL;
      int cnt_inits_to = 0;
      uint16_t his_limit, i_want;
      int abort_flag, padval;
      int num_ext;
      int p_len;
      struct socket *so;

      if (stcb)
            asoc = &stcb->asoc;
      else
            asoc = NULL;
      mp_last = NULL;
      if ((asoc != NULL) &&
          (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
          (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
            /* new addresses, out of here in non-cookie-wait states */
            /*
             * Send a ABORT, we don't add the new address error clause
             * though we even set the T bit and copy in the 0 tag.. this
             * looks no different than if no listener was present.
             */
            sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id);
            return;
      }
      abort_flag = 0;
      op_err = sctp_arethere_unrecognized_parameters(init_pkt,
          (offset + sizeof(struct sctp_init_chunk)),
          &abort_flag, (struct sctp_chunkhdr *)init_chk);
      if (abort_flag) {
            sctp_send_abort(init_pkt, iphlen, sh,
                init_chk->init.initiate_tag, op_err, vrf_id);
            return;
      }
      m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
      if (m == NULL) {
            /* No memory, INIT timer will re-attempt. */
            if (op_err)
                  sctp_m_freem(op_err);
            return;
      }
      SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);

      /* the time I built cookie */
      (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);

      /* populate any tie tags */
      if (asoc != NULL) {
            /* unlock before tag selections */
            stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
            stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
            stc.cookie_life = asoc->cookie_life;
            net = asoc->primary_destination;
      } else {
            stc.tie_tag_my_vtag = 0;
            stc.tie_tag_peer_vtag = 0;
            /* life I will award this cookie */
            stc.cookie_life = inp->sctp_ep.def_cookie_life;
      }

      /* copy in the ports for later check */
      stc.myport = sh->dest_port;
      stc.peerport = sh->src_port;

      /*
       * If we wanted to honor cookie life extentions, we would add to
       * stc.cookie_life. For now we should NOT honor any extension
       */
      stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
      if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
            struct inpcb *in_inp;

            /* Its a V6 socket */
            in_inp = (struct inpcb *)inp;
            stc.ipv6_addr_legal = 1;
            /* Now look at the binding flag to see if V4 will be legal */
            if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
                  stc.ipv4_addr_legal = 1;
            } else {
                  /* V4 addresses are NOT legal on the association */
                  stc.ipv4_addr_legal = 0;
            }
      } else {
            /* Its a V4 socket, no - V6 */
            stc.ipv4_addr_legal = 1;
            stc.ipv6_addr_legal = 0;
      }

#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
      stc.ipv4_scope = 1;
#else
      stc.ipv4_scope = 0;
#endif
      /* now for scope setup */
      memset((caddr_t)&store, 0, sizeof(store));
      sin = (struct sockaddr_in *)&store;
      sin6 = (struct sockaddr_in6 *)&store;
      if (net == NULL) {
            to = (struct sockaddr *)&store;
            iph = mtod(init_pkt, struct ip *);
            if (iph->ip_v == IPVERSION) {
                  struct sctp_ifa *addr;
                  sctp_route_t iproute;

                  sin->sin_family = AF_INET;
                  sin->sin_len = sizeof(struct sockaddr_in);
                  sin->sin_port = sh->src_port;
                  sin->sin_addr = iph->ip_src;
                  /* lookup address */
                  stc.address[0] = sin->sin_addr.s_addr;
                  stc.address[1] = 0;
                  stc.address[2] = 0;
                  stc.address[3] = 0;
                  stc.addr_type = SCTP_IPV4_ADDRESS;
                  /* local from address */
                  memset(&iproute, 0, sizeof(iproute));
                  ro = &iproute;
                  memcpy(&ro->ro_dst, sin, sizeof(*sin));
                  addr = sctp_source_address_selection(inp, NULL,
                      ro, NULL, 0,
                      vrf_id);
                  if (addr == NULL)
                        return;

                  if (ro->ro_rt) {
                        RTFREE(ro->ro_rt);
                        ro->ro_rt = NULL;
                  }
                  stc.laddress[0] = addr->address.sin.sin_addr.s_addr;
                  stc.laddress[1] = 0;
                  stc.laddress[2] = 0;
                  stc.laddress[3] = 0;
                  stc.laddr_type = SCTP_IPV4_ADDRESS;
                  /* scope_id is only for v6 */
                  stc.scope_id = 0;
#ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
                  if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
                        stc.ipv4_scope = 1;
                  }
#else
                  stc.ipv4_scope = 1;
#endif                        /* SCTP_DONT_DO_PRIVADDR_SCOPE */
                  /* Must use the address in this case */
                  if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
                        stc.loopback_scope = 1;
                        stc.ipv4_scope = 1;
                        stc.site_scope = 1;
                        stc.local_scope = 0;
                  }
                  sctp_free_ifa(addr);
            } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
                  struct sctp_ifa *addr;
                  struct route_in6 iproute6;

                  ip6 = mtod(init_pkt, struct ip6_hdr *);
                  sin6->sin6_family = AF_INET6;
                  sin6->sin6_len = sizeof(struct sockaddr_in6);
                  sin6->sin6_port = sh->src_port;
                  sin6->sin6_addr = ip6->ip6_src;
                  /* lookup address */
                  memcpy(&stc.address, &sin6->sin6_addr,
                      sizeof(struct in6_addr));
                  sin6->sin6_scope_id = 0;
                  stc.addr_type = SCTP_IPV6_ADDRESS;
                  stc.scope_id = 0;
                  if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
                        stc.loopback_scope = 1;
                        stc.local_scope = 0;
                        stc.site_scope = 1;
                        stc.ipv4_scope = 1;
                  } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                        /*
                         * If the new destination is a LINK_LOCAL we
                         * must have common both site and local
                         * scope. Don't set local scope though since
                         * we must depend on the source to be added
                         * implicitly. We cannot assure just because
                         * we share one link that all links are
                         * common.
                         */
                        stc.local_scope = 0;
                        stc.site_scope = 1;
                        stc.ipv4_scope = 1;
                        /*
                         * we start counting for the private address
                         * stuff at 1. since the link local we
                         * source from won't show up in our scoped
                         * count.
                         */
                        cnt_inits_to = 1;
                        /* pull out the scope_id from incoming pkt */
                        /* FIX ME: does this have scope from rcvif? */
                        (void)sa6_recoverscope(sin6);

                        sa6_embedscope(sin6, ip6_use_defzone);
                        stc.scope_id = sin6->sin6_scope_id;
                  } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
                        /*
                         * If the new destination is SITE_LOCAL then
                         * we must have site scope in common.
                         */
                        stc.site_scope = 1;
                  }
                  /* local from address */
                  memset(&iproute6, 0, sizeof(iproute6));
                  ro = (sctp_route_t *) & iproute6;
                  memcpy(&ro->ro_dst, sin6, sizeof(*sin6));
                  addr = sctp_source_address_selection(inp, NULL,
                      ro, NULL, 0, vrf_id);
                  if (addr == NULL)
                        return;

                  if (ro->ro_rt) {
                        RTFREE(ro->ro_rt);
                        ro->ro_rt = NULL;
                  }
                  memcpy(&stc.laddress, &addr->address.sin6.sin6_addr, sizeof(struct in6_addr));
                  stc.laddr_type = SCTP_IPV6_ADDRESS;
                  sctp_free_ifa(addr);
            }
      } else {
            /* set the scope per the existing tcb */
            struct sctp_nets *lnet;

            stc.loopback_scope = asoc->loopback_scope;
            stc.ipv4_scope = asoc->ipv4_local_scope;
            stc.site_scope = asoc->site_scope;
            stc.local_scope = asoc->local_scope;
            TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
                  if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
                        if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
                              /*
                               * if we have a LL address, start
                               * counting at 1.
                               */
                              cnt_inits_to = 1;
                        }
                  }
            }

            /* use the net pointer */
            to = (struct sockaddr *)&net->ro._l_addr;
            if (to->sa_family == AF_INET) {
                  sin = (struct sockaddr_in *)to;
                  stc.address[0] = sin->sin_addr.s_addr;
                  stc.address[1] = 0;
                  stc.address[2] = 0;
                  stc.address[3] = 0;
                  stc.addr_type = SCTP_IPV4_ADDRESS;
                  if (net->src_addr_selected == 0) {
                        /*
                         * strange case here, the INIT should have
                         * did the selection.
                         */
                        net->ro._s_addr = sctp_source_address_selection(inp,
                            stcb, (sctp_route_t *) & net->ro,
                            net, 0, vrf_id);
                        if (net->ro._s_addr == NULL)
                              return;

                        net->src_addr_selected = 1;

                  }
                  stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
                  stc.laddress[1] = 0;
                  stc.laddress[2] = 0;
                  stc.laddress[3] = 0;
                  stc.laddr_type = SCTP_IPV4_ADDRESS;
            } else if (to->sa_family == AF_INET6) {
                  sin6 = (struct sockaddr_in6 *)to;
                  memcpy(&stc.address, &sin6->sin6_addr,
                      sizeof(struct in6_addr));
                  stc.addr_type = SCTP_IPV6_ADDRESS;
                  if (net->src_addr_selected == 0) {
                        /*
                         * strange case here, the INIT should have
                         * did the selection.
                         */
                        net->ro._s_addr = sctp_source_address_selection(inp,
                            stcb, (sctp_route_t *) & net->ro,
                            net, 0, vrf_id);
                        if (net->ro._s_addr == NULL)
                              return;

                        net->src_addr_selected = 1;
                  }
                  memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
                      sizeof(struct in6_addr));
                  stc.laddr_type = SCTP_IPV6_ADDRESS;
            }
      }
      /* Now lets put the SCTP header in place */
      initackm_out = mtod(m, struct sctp_init_msg *);
      initackm_out->sh.src_port = inp->sctp_lport;
      initackm_out->sh.dest_port = sh->src_port;
      initackm_out->sh.v_tag = init_chk->init.initiate_tag;
      /* Save it off for quick ref */
      stc.peers_vtag = init_chk->init.initiate_tag;
      initackm_out->sh.checksum = 0;      /* calculate later */
      /* who are we */
      memcpy(stc.identification, SCTP_VERSION_STRING,
          min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
      /* now the chunk header */
      initackm_out->msg.ch.chunk_type = SCTP_INITIATION_ACK;
      initackm_out->msg.ch.chunk_flags = 0;
      /* fill in later from mbuf we build */
      initackm_out->msg.ch.chunk_length = 0;
      /* place in my tag */
      if ((asoc != NULL) &&
          ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
          (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
          (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
            /* re-use the v-tags and init-seq here */
            initackm_out->msg.init.initiate_tag = htonl(asoc->my_vtag);
            initackm_out->msg.init.initial_tsn = htonl(asoc->init_seq_number);
      } else {
            uint32_t vtag, itsn;

            if (hold_inp_lock) {
                  SCTP_INP_INCR_REF(inp);
                  SCTP_INP_RUNLOCK(inp);
            }
            if (asoc) {
                  atomic_add_int(&asoc->refcnt, 1);
                  SCTP_TCB_UNLOCK(stcb);
                  vtag = sctp_select_a_tag(inp, 1);
                  initackm_out->msg.init.initiate_tag = htonl(vtag);
                  /* get a TSN to use too */
                  itsn = sctp_select_initial_TSN(&inp->sctp_ep);
                  initackm_out->msg.init.initial_tsn = htonl(itsn);
                  SCTP_TCB_LOCK(stcb);
                  atomic_add_int(&asoc->refcnt, -1);
            } else {
                  vtag = sctp_select_a_tag(inp, 1);
                  initackm_out->msg.init.initiate_tag = htonl(vtag);
                  /* get a TSN to use too */
                  initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
            }
            if (hold_inp_lock) {
                  SCTP_INP_RLOCK(inp);
                  SCTP_INP_DECR_REF(inp);
            }
      }
      /* save away my tag to */
      stc.my_vtag = initackm_out->msg.init.initiate_tag;

      /* set up some of the credits. */
      so = inp->sctp_socket;
      if (so == NULL) {
            /* memory problem */
            sctp_m_freem(m);
            return;
      } else {
            initackm_out->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
      }
      /* set what I want */
      his_limit = ntohs(init_chk->init.num_inbound_streams);
      /* choose what I want */
      if (asoc != NULL) {
            if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
                  i_want = asoc->streamoutcnt;
            } else {
                  i_want = inp->sctp_ep.pre_open_stream_count;
            }
      } else {
            i_want = inp->sctp_ep.pre_open_stream_count;
      }
      if (his_limit < i_want) {
            /* I Want more :< */
            initackm_out->msg.init.num_outbound_streams = init_chk->init.num_inbound_streams;
      } else {
            /* I can have what I want :> */
            initackm_out->msg.init.num_outbound_streams = htons(i_want);
      }
      /* tell him his limt. */
      initackm_out->msg.init.num_inbound_streams =
          htons(inp->sctp_ep.max_open_streams_intome);
      /* setup the ECN pointer */

      if (inp->sctp_ep.adaptation_layer_indicator) {
            struct sctp_adaptation_layer_indication *ali;

            ali = (struct sctp_adaptation_layer_indication *)(
                (caddr_t)initackm_out + sizeof(*initackm_out));
            ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
            ali->ph.param_length = htons(sizeof(*ali));
            ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
            SCTP_BUF_LEN(m) += sizeof(*ali);
            ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
                sizeof(*ali));
      } else {
            ecn = (struct sctp_ecn_supported_param *)(
                (caddr_t)initackm_out + sizeof(*initackm_out));
      }

      /* ECN parameter */
      if (sctp_ecn_enable == 1) {
            ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
            ecn->ph.param_length = htons(sizeof(*ecn));
            SCTP_BUF_LEN(m) += sizeof(*ecn);

            prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
                sizeof(*ecn));
      } else {
            prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
      }
      /* And now tell the peer we do  pr-sctp */
      prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
      prsctp->ph.param_length = htons(sizeof(*prsctp));
      SCTP_BUF_LEN(m) += sizeof(*prsctp);

      /* And now tell the peer we do all the extensions */
      pr_supported = (struct sctp_supported_chunk_types_param *)
          ((caddr_t)prsctp + sizeof(*prsctp));

      pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
      num_ext = 0;
      pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
      pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
      pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
      pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
      pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
      if (!sctp_auth_disable)
            pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
      p_len = sizeof(*pr_supported) + num_ext;
      pr_supported->ph.param_length = htons(p_len);
      bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
      SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);

      /* ECN nonce: And now tell the peer we support ECN nonce */
      if (sctp_ecn_nonce) {
            ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
                ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
            ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
            ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
            SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
      }
      /* add authentication parameters */
      if (!sctp_auth_disable) {
            struct sctp_auth_random *randp;
            struct sctp_auth_hmac_algo *hmacs;
            struct sctp_auth_chunk_list *chunks;
            uint16_t random_len;

            /* generate and add RANDOM parameter */
            random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
            randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
            randp->ph.param_type = htons(SCTP_RANDOM);
            p_len = sizeof(*randp) + random_len;
            randp->ph.param_length = htons(p_len);
            SCTP_READ_RANDOM(randp->random_data, random_len);
            /* zero out any padding required */
            bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
            SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);

            /* add HMAC_ALGO parameter */
            hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
            p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
                (uint8_t *) hmacs->hmac_ids);
            if (p_len > 0) {
                  p_len += sizeof(*hmacs);
                  hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
                  hmacs->ph.param_length = htons(p_len);
                  /* zero out any padding required */
                  bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
                  SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
            }
            /* add CHUNKS parameter */
            chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
            p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
                chunks->chunk_types);
            if (p_len > 0) {
                  p_len += sizeof(*chunks);
                  chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
                  chunks->ph.param_length = htons(p_len);
                  /* zero out any padding required */
                  bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
                  SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
            }
      }
      m_at = m;
      /* now the addresses */
      {
            struct sctp_scoping scp;

            /*
             * To optimize this we could put the scoping stuff into a
             * structure and remove the individual uint8's from the stc
             * structure. Then we could just sifa in the address within
             * the stc.. but for now this is a quick hack to get the
             * address stuff teased apart.
             */
            scp.ipv4_addr_legal = stc.ipv4_addr_legal;
            scp.ipv6_addr_legal = stc.ipv6_addr_legal;
            scp.loopback_scope = stc.loopback_scope;
            scp.ipv4_local_scope = stc.ipv4_scope;
            scp.local_scope = stc.local_scope;
            scp.site_scope = stc.site_scope;
            m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
      }

      /* tack on the operational error if present */
      if (op_err) {
            struct mbuf *ol;
            int llen;

            llen = 0;
            ol = op_err;
            while (ol) {
                  llen += SCTP_BUF_LEN(ol);
                  ol = SCTP_BUF_NEXT(ol);
            }
            if (llen % 4) {
                  /* must add a pad to the param */
                  uint32_t cpthis = 0;
                  int padlen;

                  padlen = 4 - (llen % 4);
                  m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
            }
            while (SCTP_BUF_NEXT(m_at) != NULL) {
                  m_at = SCTP_BUF_NEXT(m_at);
            }
            SCTP_BUF_NEXT(m_at) = op_err;
            while (SCTP_BUF_NEXT(m_at) != NULL) {
                  m_at = SCTP_BUF_NEXT(m_at);
            }
      }
      /* pre-calulate the size and update pkt header and chunk header */
      p_len = 0;
      for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
            p_len += SCTP_BUF_LEN(m_tmp);
            if (SCTP_BUF_NEXT(m_tmp) == NULL) {
                  /* m_tmp should now point to last one */
                  break;
            }
      }

      /* Now we must build a cookie */
      m_cookie = sctp_add_cookie(inp, init_pkt, offset, m,
          sizeof(struct sctphdr), &stc, &signature);
      if (m_cookie == NULL) {
            /* memory problem */
            sctp_m_freem(m);
            return;
      }
      /* Now append the cookie to the end and update the space/size */
      SCTP_BUF_NEXT(m_tmp) = m_cookie;

      for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
            p_len += SCTP_BUF_LEN(m_tmp);
            if (SCTP_BUF_NEXT(m_tmp) == NULL) {
                  /* m_tmp should now point to last one */
                  mp_last = m_tmp;
                  break;
            }
      }
      /*
       * Place in the size, but we don't include the last pad (if any) in
       * the INIT-ACK.
       */
      initackm_out->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));

      /*
       * Time to sign the cookie, we don't sign over the cookie signature
       * though thus we set trailer.
       */
      (void)sctp_hmac_m(SCTP_HMAC,
          (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
          SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
          (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
      /*
       * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
       * here since the timer will drive a retranmission.
       */
      padval = p_len % 4;
      if ((padval) && (mp_last)) {
            /* see my previous comments on mp_last */
            int ret;

            ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
            if (ret) {
                  /* Houston we have a problem, no space */
                  sctp_m_freem(m);
                  return;
            }
            p_len += padval;
      }
      (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
          NULL, 0, SCTP_SO_NOT_LOCKED);
      SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
}


void
sctp_insert_on_wheel(struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    struct sctp_stream_out *strq, int holds_lock)
{
      struct sctp_stream_out *stre, *strn;

      if (holds_lock == 0) {
            SCTP_TCB_SEND_LOCK(stcb);
      }
      if ((strq->next_spoke.tqe_next) ||
          (strq->next_spoke.tqe_prev)) {
            /* already on wheel */
            goto outof_here;
      }
      stre = TAILQ_FIRST(&asoc->out_wheel);
      if (stre == NULL) {
            /* only one on wheel */
            TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
            goto outof_here;
      }
      for (; stre; stre = strn) {
            strn = TAILQ_NEXT(stre, next_spoke);
            if (stre->stream_no > strq->stream_no) {
                  TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
                  goto outof_here;
            } else if (stre->stream_no == strq->stream_no) {
                  /* huh, should not happen */
                  goto outof_here;
            } else if (strn == NULL) {
                  /* next one is null */
                  TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
                      next_spoke);
            }
      }
outof_here:
      if (holds_lock == 0) {
            SCTP_TCB_SEND_UNLOCK(stcb);
      }
}

static void
sctp_remove_from_wheel(struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    struct sctp_stream_out *strq)
{
      /* take off and then setup so we know it is not on the wheel */
      SCTP_TCB_SEND_LOCK(stcb);
      if (TAILQ_FIRST(&strq->outqueue)) {
            /* more was added */
            SCTP_TCB_SEND_UNLOCK(stcb);
            return;
      }
      TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
      strq->next_spoke.tqe_next = NULL;
      strq->next_spoke.tqe_prev = NULL;
      SCTP_TCB_SEND_UNLOCK(stcb);
}

static void
sctp_prune_prsctp(struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    struct sctp_sndrcvinfo *srcv,
    int dataout)
{
      int freed_spc = 0;
      struct sctp_tmit_chunk *chk, *nchk;

      SCTP_TCB_LOCK_ASSERT(stcb);
      if ((asoc->peer_supports_prsctp) &&
          (asoc->sent_queue_cnt_removeable > 0)) {
            TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
                  /*
                   * Look for chunks marked with the PR_SCTP flag AND
                   * the buffer space flag. If the one being sent is
                   * equal or greater priority then purge the old one
                   * and free some space.
                   */
                  if (PR_SCTP_BUF_ENABLED(chk->flags)) {
                        /*
                         * This one is PR-SCTP AND buffer space
                         * limited type
                         */
                        if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
                              /*
                               * Lower numbers equates to higher
                               * priority so if the one we are
                               * looking at has a larger or equal
                               * priority we want to drop the data
                               * and NOT retransmit it.
                               */
                              if (chk->data) {
                                    /*
                                     * We release the book_size
                                     * if the mbuf is here
                                     */
                                    int ret_spc;
                                    int cause;

                                    if (chk->sent > SCTP_DATAGRAM_UNSENT)
                                          cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
                                    else
                                          cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
                                    ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
                                        cause,
                                        &asoc->sent_queue, SCTP_SO_LOCKED);
                                    freed_spc += ret_spc;
                                    if (freed_spc >= dataout) {
                                          return;
                                    }
                              }     /* if chunk was present */
                        }     /* if of sufficent priority */
                  }     /* if chunk has enabled */
            }           /* tailqforeach */

            chk = TAILQ_FIRST(&asoc->send_queue);
            while (chk) {
                  nchk = TAILQ_NEXT(chk, sctp_next);
                  /* Here we must move to the sent queue and mark */
                  if (PR_SCTP_TTL_ENABLED(chk->flags)) {
                        if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
                              if (chk->data) {
                                    /*
                                     * We release the book_size
                                     * if the mbuf is here
                                     */
                                    int ret_spc;

                                    ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
                                        SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
                                        &asoc->send_queue, SCTP_SO_LOCKED);

                                    freed_spc += ret_spc;
                                    if (freed_spc >= dataout) {
                                          return;
                                    }
                              }     /* end if chk->data */
                        }     /* end if right class */
                  }     /* end if chk pr-sctp */
                  chk = nchk;
            }           /* end while (chk) */
      }                 /* if enabled in asoc */
}

int
sctp_get_frag_point(struct sctp_tcb *stcb,
    struct sctp_association *asoc)
{
      int siz, ovh;

      /*
       * For endpoints that have both v6 and v4 addresses we must reserve
       * room for the ipv6 header, for those that are only dealing with V4
       * we use a larger frag point.
       */
      if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
            ovh = SCTP_MED_OVERHEAD;
      } else {
            ovh = SCTP_MED_V4_OVERHEAD;
      }

      if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
            siz = asoc->smallest_mtu - ovh;
      else
            siz = (stcb->asoc.sctp_frag_point - ovh);
      /*
       * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
       */
      /* A data chunk MUST fit in a cluster */
      /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
      /* } */

      /* adjust for an AUTH chunk if DATA requires auth */
      if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
            siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);

      if (siz % 4) {
            /* make it an even word boundary please */
            siz -= (siz % 4);
      }
      return (siz);
}

static void
sctp_set_prsctp_policy(struct sctp_tcb *stcb,
    struct sctp_stream_queue_pending *sp)
{
      sp->pr_sctp_on = 0;
      if (stcb->asoc.peer_supports_prsctp) {
            /*
             * We assume that the user wants PR_SCTP_TTL if the user
             * provides a positive lifetime but does not specify any
             * PR_SCTP policy. This is a BAD assumption and causes
             * problems at least with the U-Vancovers MPI folks. I will
             * change this to be no policy means NO PR-SCTP.
             */
            if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
                  sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
                  sp->pr_sctp_on = 1;
            } else {
                  return;
            }
            switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
            case CHUNK_FLAGS_PR_SCTP_BUF:
                  /*
                   * Time to live is a priority stored in tv_sec when
                   * doing the buffer drop thing.
                   */
                  sp->ts.tv_sec = sp->timetolive;
                  sp->ts.tv_usec = 0;
                  break;
            case CHUNK_FLAGS_PR_SCTP_TTL:
                  {
                        struct timeval tv;

                        (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
                        tv.tv_sec = sp->timetolive / 1000;
                        tv.tv_usec = (sp->timetolive * 1000) % 1000000;
                        timevaladd(&sp->ts, &tv);
                  }
                  break;
            case CHUNK_FLAGS_PR_SCTP_RTX:
                  /*
                   * Time to live is a the number or retransmissions
                   * stored in tv_sec.
                   */
                  sp->ts.tv_sec = sp->timetolive;
                  sp->ts.tv_usec = 0;
                  break;
            default:
                  SCTPDBG(SCTP_DEBUG_USRREQ1,
                      "Unknown PR_SCTP policy %u.\n",
                      PR_SCTP_POLICY(sp->sinfo_flags));
                  break;
            }
      }
}

static int
sctp_msg_append(struct sctp_tcb *stcb,
    struct sctp_nets *net,
    struct mbuf *m,
    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
{
      int error = 0, holds_lock;
      struct mbuf *at;
      struct sctp_stream_queue_pending *sp = NULL;
      struct sctp_stream_out *strm;

      /*
       * Given an mbuf chain, put it into the association send queue and
       * place it on the wheel
       */
      holds_lock = hold_stcb_lock;
      if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
            /* Invalid stream number */
            SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            error = EINVAL;
            goto out_now;
      }
      if ((stcb->asoc.stream_locked) &&
          (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
            SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            error = EINVAL;
            goto out_now;
      }
      strm = &stcb->asoc.strmout[srcv->sinfo_stream];
      /* Now can we send this? */
      if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
          (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
          (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
          (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
            /* got data while shutting down */
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
            error = ECONNRESET;
            goto out_now;
      }
      sctp_alloc_a_strmoq(stcb, sp);
      if (sp == NULL) {
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
            error = ENOMEM;
            goto out_now;
      }
      sp->sinfo_flags = srcv->sinfo_flags;
      sp->timetolive = srcv->sinfo_timetolive;
      sp->ppid = srcv->sinfo_ppid;
      sp->context = srcv->sinfo_context;
      sp->strseq = 0;
      if (sp->sinfo_flags & SCTP_ADDR_OVER) {
            sp->net = net;
            sp->addr_over = 1;
      } else {
            sp->net = stcb->asoc.primary_destination;
            sp->addr_over = 0;
      }
      atomic_add_int(&sp->net->ref_count, 1);
      (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
      sp->stream = srcv->sinfo_stream;
      sp->msg_is_complete = 1;
      sp->sender_all_done = 1;
      sp->some_taken = 0;
      sp->data = m;
      sp->tail_mbuf = NULL;
      sp->length = 0;
      at = m;
      sctp_set_prsctp_policy(stcb, sp);
      /*
       * We could in theory (for sendall) sifa the length in, but we would
       * still have to hunt through the chain since we need to setup the
       * tail_mbuf
       */
      while (at) {
            if (SCTP_BUF_NEXT(at) == NULL)
                  sp->tail_mbuf = at;
            sp->length += SCTP_BUF_LEN(at);
            at = SCTP_BUF_NEXT(at);
      }
      SCTP_TCB_SEND_LOCK(stcb);
      sctp_snd_sb_alloc(stcb, sp->length);
      atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
      TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
      if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
            sp->strseq = strm->next_sequence_sent;
            strm->next_sequence_sent++;
      }
      if ((strm->next_spoke.tqe_next == NULL) &&
          (strm->next_spoke.tqe_prev == NULL)) {
            /* Not on wheel, insert */
            sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
      }
      m = NULL;
      SCTP_TCB_SEND_UNLOCK(stcb);
out_now:
      if (m) {
            sctp_m_freem(m);
      }
      return (error);
}


static struct mbuf *
sctp_copy_mbufchain(struct mbuf *clonechain,
    struct mbuf *outchain,
    struct mbuf **endofchain,
    int can_take_mbuf,
    int sizeofcpy,
    uint8_t copy_by_ref)
{
      struct mbuf *m;
      struct mbuf *appendchain;
      caddr_t cp;
      int len;

      if (endofchain == NULL) {
            /* error */
error_out:
            if (outchain)
                  sctp_m_freem(outchain);
            return (NULL);
      }
      if (can_take_mbuf) {
            appendchain = clonechain;
      } else {
            if (!copy_by_ref &&
                (sizeofcpy <= (int)((((sctp_mbuf_threshold_count - 1) * MLEN) + MHLEN)))
                ) {
                  /* Its not in a cluster */
                  if (*endofchain == NULL) {
                        /* lets get a mbuf cluster */
                        if (outchain == NULL) {
                              /* This is the general case */
                  new_mbuf:
                              outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
                              if (outchain == NULL) {
                                    goto error_out;
                              }
                              SCTP_BUF_LEN(outchain) = 0;
                              *endofchain = outchain;
                              /* get the prepend space */
                              SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
                        } else {
                              /*
                               * We really should not get a NULL
                               * in endofchain
                               */
                              /* find end */
                              m = outchain;
                              while (m) {
                                    if (SCTP_BUF_NEXT(m) == NULL) {
                                          *endofchain = m;
                                          break;
                                    }
                                    m = SCTP_BUF_NEXT(m);
                              }
                              /* sanity */
                              if (*endofchain == NULL) {
                                    /*
                                     * huh, TSNH XXX maybe we
                                     * should panic
                                     */
                                    sctp_m_freem(outchain);
                                    goto new_mbuf;
                              }
                        }
                        /* get the new end of length */
                        len = M_TRAILINGSPACE(*endofchain);
                  } else {
                        /* how much is left at the end? */
                        len = M_TRAILINGSPACE(*endofchain);
                  }
                  /* Find the end of the data, for appending */
                  cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));

                  /* Now lets copy it out */
                  if (len >= sizeofcpy) {
                        /* It all fits, copy it in */
                        m_copydata(clonechain, 0, sizeofcpy, cp);
                        SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
                  } else {
                        /* fill up the end of the chain */
                        if (len > 0) {
                              m_copydata(clonechain, 0, len, cp);
                              SCTP_BUF_LEN((*endofchain)) += len;
                              /* now we need another one */
                              sizeofcpy -= len;
                        }
                        m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
                        if (m == NULL) {
                              /* We failed */
                              goto error_out;
                        }
                        SCTP_BUF_NEXT((*endofchain)) = m;
                        *endofchain = m;
                        cp = mtod((*endofchain), caddr_t);
                        m_copydata(clonechain, len, sizeofcpy, cp);
                        SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
                  }
                  return (outchain);
            } else {
                  /* copy the old fashion way */
                  appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
            }
      }
      if (appendchain == NULL) {
            /* error */
            if (outchain)
                  sctp_m_freem(outchain);
            return (NULL);
      }
      if (outchain) {
            /* tack on to the end */
            if (*endofchain != NULL) {
                  SCTP_BUF_NEXT(((*endofchain))) = appendchain;
            } else {
                  m = outchain;
                  while (m) {
                        if (SCTP_BUF_NEXT(m) == NULL) {
                              SCTP_BUF_NEXT(m) = appendchain;
                              break;
                        }
                        m = SCTP_BUF_NEXT(m);
                  }
            }
            /*
             * save off the end and update the end-chain postion
             */
            m = appendchain;
            while (m) {
                  if (SCTP_BUF_NEXT(m) == NULL) {
                        *endofchain = m;
                        break;
                  }
                  m = SCTP_BUF_NEXT(m);
            }
            return (outchain);
      } else {
            /* save off the end and update the end-chain postion */
            m = appendchain;
            while (m) {
                  if (SCTP_BUF_NEXT(m) == NULL) {
                        *endofchain = m;
                        break;
                  }
                  m = SCTP_BUF_NEXT(m);
            }
            return (appendchain);
      }
}

int
sctp_med_chunk_output(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    int *num_out,
    int *reason_code,
    int control_only, int *cwnd_full, int from_where,
    struct timeval *now, int *now_filled, int frag_point, int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
);

static void
sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
    uint32_t val)
{
      struct sctp_copy_all *ca;
      struct mbuf *m;
      int ret = 0;
      int added_control = 0;
      int un_sent, do_chunk_output = 1;
      struct sctp_association *asoc;

      ca = (struct sctp_copy_all *)ptr;
      if (ca->m == NULL) {
            return;
      }
      if (ca->inp != inp) {
            /* TSNH */
            return;
      }
      if ((ca->m) && ca->sndlen) {
            m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
            if (m == NULL) {
                  /* can't copy so we are done */
                  ca->cnt_failed++;
                  return;
            }
      } else {
            m = NULL;
      }
      SCTP_TCB_LOCK_ASSERT(stcb);
      if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
            /* Abort this assoc with m as the user defined reason */
            if (m) {
                  struct sctp_paramhdr *ph;

                  SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
                  if (m) {
                        ph = mtod(m, struct sctp_paramhdr *);
                        ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
                        ph->param_length = htons(ca->sndlen);
                  }
                  /*
                   * We add one here to keep the assoc from
                   * dis-appearing on us.
                   */
                  atomic_add_int(&stcb->asoc.refcnt, 1);
                  sctp_abort_an_association(inp, stcb,
                      SCTP_RESPONSE_TO_USER_REQ,
                      m, SCTP_SO_NOT_LOCKED);
                  /*
                   * sctp_abort_an_association calls sctp_free_asoc()
                   * free association will NOT free it since we
                   * incremented the refcnt .. we do this to prevent
                   * it being freed and things getting tricky since we
                   * could end up (from free_asoc) calling inpcb_free
                   * which would get a recursive lock call to the
                   * iterator lock.. But as a consequence of that the
                   * stcb will return to us un-locked.. since
                   * free_asoc returns with either no TCB or the TCB
                   * unlocked, we must relock.. to unlock in the
                   * iterator timer :-0
                   */
                  SCTP_TCB_LOCK(stcb);
                  atomic_add_int(&stcb->asoc.refcnt, -1);
                  goto no_chunk_output;
            }
      } else {
            if (m) {
                  ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
                      &ca->sndrcv, 1);
            }
            asoc = &stcb->asoc;
            if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
                  /* shutdown this assoc */
                  int cnt;

                  cnt = sctp_is_there_unsent_data(stcb);

                  if (TAILQ_EMPTY(&asoc->send_queue) &&
                      TAILQ_EMPTY(&asoc->sent_queue) &&
                      (cnt == 0)) {
                        if (asoc->locked_on_sending) {
                              goto abort_anyway;
                        }
                        /*
                         * there is nothing queued to send, so I'm
                         * done...
                         */
                        if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
                            (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
                            (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
                              /*
                               * only send SHUTDOWN the first time
                               * through
                               */
                              sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
                              if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
                                    SCTP_STAT_DECR_GAUGE32(sctps_currestab);
                              }
                              SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
                              SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
                              sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
                                  asoc->primary_destination);
                              sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
                                  asoc->primary_destination);
                              added_control = 1;
                              do_chunk_output = 0;
                        }
                  } else {
                        /*
                         * we still got (or just got) data to send,
                         * so set SHUTDOWN_PENDING
                         */
                        /*
                         * XXX sockets draft says that SCTP_EOF
                         * should be sent with no data.  currently,
                         * we will allow user data to be sent first
                         * and move to SHUTDOWN-PENDING
                         */
                        if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
                            (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
                            (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
                              if (asoc->locked_on_sending) {
                                    /*
                                     * Locked to send out the
                                     * data
                                     */
                                    struct sctp_stream_queue_pending *sp;

                                    sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
                                    if (sp) {
                                          if ((sp->length == 0) && (sp->msg_is_complete == 0))
                                                asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
                                    }
                              }
                              asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
                              if (TAILQ_EMPTY(&asoc->send_queue) &&
                                  TAILQ_EMPTY(&asoc->sent_queue) &&
                                  (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
                        abort_anyway:
                                    atomic_add_int(&stcb->asoc.refcnt, 1);
                                    sctp_abort_an_association(stcb->sctp_ep, stcb,
                                        SCTP_RESPONSE_TO_USER_REQ,
                                        NULL, SCTP_SO_NOT_LOCKED);
                                    atomic_add_int(&stcb->asoc.refcnt, -1);
                                    goto no_chunk_output;
                              }
                              sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
                                  asoc->primary_destination);
                        }
                  }

            }
      }
      un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
          ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));

      if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
          (stcb->asoc.total_flight > 0) &&
          (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
          ) {
            do_chunk_output = 0;
      }
      if (do_chunk_output)
            sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
      else if (added_control) {
            int num_out = 0, reason = 0, cwnd_full = 0, now_filled = 0;
            struct timeval now;
            int frag_point;

            frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
            (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
                &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
      }
no_chunk_output:
      if (ret) {
            ca->cnt_failed++;
      } else {
            ca->cnt_sent++;
      }
}

static void
sctp_sendall_completes(void *ptr, uint32_t val)
{
      struct sctp_copy_all *ca;

      ca = (struct sctp_copy_all *)ptr;
      /*
       * Do a notify here? Kacheong suggests that the notify be done at
       * the send time.. so you would push up a notification if any send
       * failed. Don't know if this is feasable since the only failures we
       * have is "memory" related and if you cannot get an mbuf to send
       * the data you surely can't get an mbuf to send up to notify the
       * user you can't send the data :->
       */

      /* now free everything */
      sctp_m_freem(ca->m);
      SCTP_FREE(ca, SCTP_M_COPYAL);
}


#define     MC_ALIGN(m, len) do {                                 \
      SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1));   \
} while (0)



static struct mbuf *
sctp_copy_out_all(struct uio *uio, int len)
{
      struct mbuf *ret, *at;
      int left, willcpy, cancpy, error;

      ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
      if (ret == NULL) {
            /* TSNH */
            return (NULL);
      }
      left = len;
      SCTP_BUF_LEN(ret) = 0;
      /* save space for the data chunk header */
      cancpy = M_TRAILINGSPACE(ret);
      willcpy = min(cancpy, left);
      at = ret;
      while (left > 0) {
            /* Align data to the end */
            error = uiomove(mtod(at, caddr_t), willcpy, uio);
            if (error) {
      err_out_now:
                  sctp_m_freem(at);
                  return (NULL);
            }
            SCTP_BUF_LEN(at) = willcpy;
            SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
            left -= willcpy;
            if (left > 0) {
                  SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
                  if (SCTP_BUF_NEXT(at) == NULL) {
                        goto err_out_now;
                  }
                  at = SCTP_BUF_NEXT(at);
                  SCTP_BUF_LEN(at) = 0;
                  cancpy = M_TRAILINGSPACE(at);
                  willcpy = min(cancpy, left);
            }
      }
      return (ret);
}

static int
sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
    struct sctp_sndrcvinfo *srcv)
{
      int ret;
      struct sctp_copy_all *ca;

      SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
          SCTP_M_COPYAL);
      if (ca == NULL) {
            sctp_m_freem(m);
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
            return (ENOMEM);
      }
      memset(ca, 0, sizeof(struct sctp_copy_all));

      ca->inp = inp;
      memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
      /*
       * take off the sendall flag, it would be bad if we failed to do
       * this :-0
       */
      ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
      /* get length and mbuf chain */
      if (uio) {
            ca->sndlen = uio->uio_resid;
            ca->m = sctp_copy_out_all(uio, ca->sndlen);
            if (ca->m == NULL) {
                  SCTP_FREE(ca, SCTP_M_COPYAL);
                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                  return (ENOMEM);
            }
      } else {
            /* Gather the length of the send */
            struct mbuf *mat;

            mat = m;
            ca->sndlen = 0;
            while (m) {
                  ca->sndlen += SCTP_BUF_LEN(m);
                  m = SCTP_BUF_NEXT(m);
            }
            ca->m = mat;
      }
      ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
          SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
          SCTP_ASOC_ANY_STATE,
          (void *)ca, 0,
          sctp_sendall_completes, inp, 1);
      if (ret) {
            SCTP_PRINTF("Failed to initiate iterator for sendall\n");
            SCTP_FREE(ca, SCTP_M_COPYAL);
            SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
            return (EFAULT);
      }
      return (0);
}


void
sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
      struct sctp_tmit_chunk *chk, *nchk;

      chk = TAILQ_FIRST(&asoc->control_send_queue);
      while (chk) {
            nchk = TAILQ_NEXT(chk, sctp_next);
            if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
                  TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
                  if (chk->data) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  asoc->ctrl_queue_cnt--;
                  sctp_free_a_chunk(stcb, chk);
            }
            chk = nchk;
      }
}

void
sctp_toss_old_asconf(struct sctp_tcb *stcb)
{
      struct sctp_association *asoc;
      struct sctp_tmit_chunk *chk, *chk_tmp;

      asoc = &stcb->asoc;
      for (chk = TAILQ_FIRST(&asoc->control_send_queue); chk != NULL;
          chk = chk_tmp) {
            /* get next chk */
            chk_tmp = TAILQ_NEXT(chk, sctp_next);
            /* find SCTP_ASCONF chunk in queue (only one ever in queue) */
            if (chk->rec.chunk_id.id == SCTP_ASCONF) {
                  TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
                  if (chk->data) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  asoc->ctrl_queue_cnt--;
                  sctp_free_a_chunk(stcb, chk);
            }
      }
}


static void
sctp_clean_up_datalist(struct sctp_tcb *stcb,

    struct sctp_association *asoc,
    struct sctp_tmit_chunk **data_list,
    int bundle_at,
    struct sctp_nets *net)
{
      int i;
      struct sctp_tmit_chunk *tp1;

      for (i = 0; i < bundle_at; i++) {
            /* off of the send queue */
            if (i) {
                  /*
                   * Any chunk NOT 0 you zap the time chunk 0 gets
                   * zapped or set based on if a RTO measurment is
                   * needed.
                   */
                  data_list[i]->do_rtt = 0;
            }
            /* record time */
            data_list[i]->sent_rcv_time = net->last_sent_time;
            data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
            TAILQ_REMOVE(&asoc->send_queue,
                data_list[i],
                sctp_next);
            /* on to the sent queue */
            tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
            if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
                data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
                  struct sctp_tmit_chunk *tpp;

                  /* need to move back */
      back_up_more:
                  tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
                  if (tpp == NULL) {
                        TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
                        goto all_done;
                  }
                  tp1 = tpp;
                  if (compare_with_wrap(tp1->rec.data.TSN_seq,
                      data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
                        goto back_up_more;
                  }
                  TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
            } else {
                  TAILQ_INSERT_TAIL(&asoc->sent_queue,
                      data_list[i],
                      sctp_next);
            }
all_done:
            /* This does not lower until the cum-ack passes it */
            asoc->sent_queue_cnt++;
            asoc->send_queue_cnt--;
            if ((asoc->peers_rwnd <= 0) &&
                (asoc->total_flight == 0) &&
                (bundle_at == 1)) {
                  /* Mark the chunk as being a window probe */
                  SCTP_STAT_INCR(sctps_windowprobed);
            }
#ifdef SCTP_AUDITING_ENABLED
            sctp_audit_log(0xC2, 3);
#endif
            data_list[i]->sent = SCTP_DATAGRAM_SENT;
            data_list[i]->snd_count = 1;
            data_list[i]->rec.data.chunk_was_revoked = 0;
            if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
                  sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
                      data_list[i]->whoTo->flight_size,
                      data_list[i]->book_size,
                      (uintptr_t) data_list[i]->whoTo,
                      data_list[i]->rec.data.TSN_seq);
            }
            sctp_flight_size_increase(data_list[i]);
            sctp_total_flight_increase(stcb, data_list[i]);
            if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
                  sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
                      asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
            }
            asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
                (uint32_t) (data_list[i]->send_size + sctp_peer_chunk_oh));
            if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
                  /* SWS sender side engages */
                  asoc->peers_rwnd = 0;
            }
      }
}

static void
sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
      struct sctp_tmit_chunk *chk, *nchk;

      for (chk = TAILQ_FIRST(&asoc->control_send_queue);
          chk; chk = nchk) {
            nchk = TAILQ_NEXT(chk, sctp_next);
            if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
                (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
                (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
                (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
                (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
                (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
                (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
                (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
                (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
                (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
                  /* Stray chunks must be cleaned up */
      clean_up_anyway:
                  TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
                  if (chk->data) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  asoc->ctrl_queue_cnt--;
                  sctp_free_a_chunk(stcb, chk);
            } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
                  /* special handling, we must look into the param */
                  if (chk != asoc->str_reset) {
                        goto clean_up_anyway;
                  }
            }
      }
}


static int
sctp_can_we_split_this(struct sctp_tcb *stcb,
    uint32_t length,
    uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
{
      /*
       * Make a decision on if I should split a msg into multiple parts.
       * This is only asked of incomplete messages.
       */
      if (eeor_on) {
            /*
             * If we are doing EEOR we need to always send it if its the
             * entire thing, since it might be all the guy is putting in
             * the hopper.
             */
            if (goal_mtu >= length) {
                  /*-
                   * If we have data outstanding,
                   * we get another chance when the sack
                   * arrives to transmit - wait for more data
                   */
                  if (stcb->asoc.total_flight == 0) {
                        /*
                         * If nothing is in flight, we zero the
                         * packet counter.
                         */
                        return (length);
                  }
                  return (0);

            } else {
                  /* You can fill the rest */
                  return (goal_mtu);
            }
      }
      /*-
       * For those strange folk that make the send buffer
       * smaller than our fragmentation point, we can't
       * get a full msg in so we have to allow splitting.
       */
      if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
            return (length);
      }
      if ((length <= goal_mtu) ||
          ((length - goal_mtu) < sctp_min_residual)) {
            /* Sub-optimial residual don't split in non-eeor mode. */
            return (0);
      }
      /*
       * If we reach here length is larger than the goal_mtu. Do we wish
       * to split it for the sake of packet putting together?
       */
      if (goal_mtu >= min(sctp_min_split_point, frag_point)) {
            /* Its ok to split it */
            return (min(goal_mtu, frag_point));
      }
      /* Nope, can't split */
      return (0);

}

static uint32_t
sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
    struct sctp_stream_out *strq,
    uint32_t goal_mtu,
    uint32_t frag_point,
    int *locked,
    int *giveup,
    int eeor_mode,
    int *bail)
{
      /* Move from the stream to the send_queue keeping track of the total */
      struct sctp_association *asoc;
      struct sctp_stream_queue_pending *sp;
      struct sctp_tmit_chunk *chk;
      struct sctp_data_chunk *dchkh;
      uint32_t to_move, length;
      uint8_t rcv_flags = 0;
      uint8_t some_taken;
      uint8_t send_lock_up = 0;

      SCTP_TCB_LOCK_ASSERT(stcb);
      asoc = &stcb->asoc;
one_more_time:
      /* sa_ignore FREED_MEMORY */
      sp = TAILQ_FIRST(&strq->outqueue);
      if (sp == NULL) {
            *locked = 0;
            if (send_lock_up == 0) {
                  SCTP_TCB_SEND_LOCK(stcb);
                  send_lock_up = 1;
            }
            sp = TAILQ_FIRST(&strq->outqueue);
            if (sp) {
                  goto one_more_time;
            }
            if (strq->last_msg_incomplete) {
                  SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
                      strq->stream_no,
                      strq->last_msg_incomplete);
                  strq->last_msg_incomplete = 0;
            }
            to_move = 0;
            if (send_lock_up) {
                  SCTP_TCB_SEND_UNLOCK(stcb);
                  send_lock_up = 0;
            }
            goto out_of;
      }
      if ((sp->msg_is_complete) && (sp->length == 0)) {
            if (sp->sender_all_done) {
                  /*
                   * We are doing differed cleanup. Last time through
                   * when we took all the data the sender_all_done was
                   * not set.
                   */
                  if (sp->put_last_out == 0) {
                        SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
                        SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
                            sp->sender_all_done,
                            sp->length,
                            sp->msg_is_complete,
                            sp->put_last_out,
                            send_lock_up);
                  }
                  if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
                        SCTP_TCB_SEND_LOCK(stcb);
                        send_lock_up = 1;
                  }
                  atomic_subtract_int(&asoc->stream_queue_cnt, 1);
                  TAILQ_REMOVE(&strq->outqueue, sp, next);
                  sctp_free_remote_addr(sp->net);
                  if (sp->data) {
                        sctp_m_freem(sp->data);
                        sp->data = NULL;
                  }
                  sctp_free_a_strmoq(stcb, sp);

                  /* we can't be locked to it */
                  *locked = 0;
                  stcb->asoc.locked_on_sending = NULL;
                  if (send_lock_up) {
                        SCTP_TCB_SEND_UNLOCK(stcb);
                        send_lock_up = 0;
                  }
                  /* back to get the next msg */
                  goto one_more_time;
            } else {
                  /*
                   * sender just finished this but still holds a
                   * reference
                   */
                  *locked = 1;
                  *giveup = 1;
                  to_move = 0;
                  goto out_of;
            }
      } else {
            /* is there some to get */
            if (sp->length == 0) {
                  /* no */
                  *locked = 1;
                  *giveup = 1;
                  to_move = 0;
                  goto out_of;
            }
      }
      some_taken = sp->some_taken;
      if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
            sp->msg_is_complete = 1;
      }
re_look:
      length = sp->length;
      if (sp->msg_is_complete) {
            /* The message is complete */
            to_move = min(length, frag_point);
            if (to_move == length) {
                  /* All of it fits in the MTU */
                  if (sp->some_taken) {
                        rcv_flags |= SCTP_DATA_LAST_FRAG;
                        sp->put_last_out = 1;
                  } else {
                        rcv_flags |= SCTP_DATA_NOT_FRAG;
                        sp->put_last_out = 1;
                  }
            } else {
                  /* Not all of it fits, we fragment */
                  if (sp->some_taken == 0) {
                        rcv_flags |= SCTP_DATA_FIRST_FRAG;
                  }
                  sp->some_taken = 1;
            }
      } else {
            to_move = sctp_can_we_split_this(stcb, length, goal_mtu,
                frag_point, eeor_mode);
            if (to_move) {
                  /*-
                     * We use a snapshot of length in case it
                     * is expanding during the compare.
                     */
                  uint32_t llen;

                  llen = length;
                  if (to_move >= llen) {
                        to_move = llen;
                        if (send_lock_up == 0) {
                              /*-
                                 * We are taking all of an incomplete msg
                                 * thus we need a send lock.
                                 */
                              SCTP_TCB_SEND_LOCK(stcb);
                              send_lock_up = 1;
                              if (sp->msg_is_complete) {
                                    /*
                                     * the sender finished the
                                     * msg
                                     */
                                    goto re_look;
                              }
                        }
                  }
                  if (sp->some_taken == 0) {
                        rcv_flags |= SCTP_DATA_FIRST_FRAG;
                        sp->some_taken = 1;
                  }
            } else {
                  /* Nothing to take. */
                  if (sp->some_taken) {
                        *locked = 1;
                  }
                  *giveup = 1;
                  to_move = 0;
                  goto out_of;
            }
      }

      /* If we reach here, we can copy out a chunk */
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            /* No chunk memory */
            *giveup = 1;
            to_move = 0;
            goto out_of;
      }
      /*
       * Setup for unordered if needed by looking at the user sent info
       * flags.
       */
      if (sp->sinfo_flags & SCTP_UNORDERED) {
            rcv_flags |= SCTP_DATA_UNORDERED;
      }
      /* clear out the chunk before setting up */
      memset(chk, 0, sizeof(*chk));
      chk->rec.data.rcv_flags = rcv_flags;

      if (to_move >= length) {
            /* we think we can steal the whole thing */
            if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
                  SCTP_TCB_SEND_LOCK(stcb);
                  send_lock_up = 1;
            }
            if (to_move < sp->length) {
                  /* bail, it changed */
                  goto dont_do_it;
            }
            chk->data = sp->data;
            chk->last_mbuf = sp->tail_mbuf;
            /* register the stealing */
            sp->data = sp->tail_mbuf = NULL;
      } else {
            struct mbuf *m;

dont_do_it:
            chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
            chk->last_mbuf = NULL;
            if (chk->data == NULL) {
                  sp->some_taken = some_taken;
                  sctp_free_a_chunk(stcb, chk);
                  *bail = 1;
                  to_move = 0;
                  goto out_of;
            }
            /* Pull off the data */
            m_adj(sp->data, to_move);
            /* Now lets work our way down and compact it */
            m = sp->data;
            while (m && (SCTP_BUF_LEN(m) == 0)) {
                  sp->data = SCTP_BUF_NEXT(m);
                  SCTP_BUF_NEXT(m) = NULL;
                  if (sp->tail_mbuf == m) {
                        /*-
                         * Freeing tail? TSNH since
                         * we supposedly were taking less
                         * than the sp->length.
                         */
#ifdef INVARIANTS
                        panic("Huh, freing tail? - TSNH");
#else
                        SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
                        sp->tail_mbuf = sp->data = NULL;
                        sp->length = 0;
#endif

                  }
                  sctp_m_free(m);
                  m = sp->data;
            }
      }
      if (SCTP_BUF_IS_EXTENDED(chk->data)) {
            chk->copy_by_ref = 1;
      } else {
            chk->copy_by_ref = 0;
      }
      /*
       * get last_mbuf and counts of mb useage This is ugly but hopefully
       * its only one mbuf.
       */
      if (chk->last_mbuf == NULL) {
            chk->last_mbuf = chk->data;
            while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
                  chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
            }
      }
      if (to_move > length) {
            /*- This should not happen either
             * since we always lower to_move to the size
             * of sp->length if its larger.
             */
#ifdef INVARIANTS
            panic("Huh, how can to_move be larger?");
#else
            SCTP_PRINTF("Huh, how can to_move be larger?\n");
            sp->length = 0;
#endif
      } else {
            atomic_subtract_int(&sp->length, to_move);
      }
      if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
            /* Not enough room for a chunk header, get some */
            struct mbuf *m;

            m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
            if (m == NULL) {
                  /*
                   * we're in trouble here. _PREPEND below will free
                   * all the data if there is no leading space, so we
                   * must put the data back and restore.
                   */
                  if (send_lock_up == 0) {
                        SCTP_TCB_SEND_LOCK(stcb);
                        send_lock_up = 1;
                  }
                  if (chk->data == NULL) {
                        /* unsteal the data */
                        sp->data = chk->data;
                        sp->tail_mbuf = chk->last_mbuf;
                  } else {
                        struct mbuf *m_tmp;

                        /* reassemble the data */
                        m_tmp = sp->data;
                        sp->data = chk->data;
                        SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
                  }
                  sp->some_taken = some_taken;
                  atomic_add_int(&sp->length, to_move);
                  chk->data = NULL;
                  *bail = 1;
                  sctp_free_a_chunk(stcb, chk);
                  to_move = 0;
                  goto out_of;
            } else {
                  SCTP_BUF_LEN(m) = 0;
                  SCTP_BUF_NEXT(m) = chk->data;
                  chk->data = m;
                  M_ALIGN(chk->data, 4);
            }
      }
      SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
      if (chk->data == NULL) {
            /* HELP, TSNH since we assured it would not above? */
#ifdef INVARIANTS
            panic("prepend failes HELP?");
#else
            SCTP_PRINTF("prepend fails HELP?\n");
            sctp_free_a_chunk(stcb, chk);
#endif
            *bail = 1;
            to_move = 0;
            goto out_of;
      }
      sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
      chk->book_size = chk->send_size = (to_move +
          sizeof(struct sctp_data_chunk));
      chk->book_size_scale = 0;
      chk->sent = SCTP_DATAGRAM_UNSENT;

      chk->flags = 0;
      chk->asoc = &stcb->asoc;
      chk->pad_inplace = 0;
      chk->no_fr_allowed = 0;
      chk->rec.data.stream_seq = sp->strseq;
      chk->rec.data.stream_number = sp->stream;
      chk->rec.data.payloadtype = sp->ppid;
      chk->rec.data.context = sp->context;
      chk->rec.data.doing_fast_retransmit = 0;
      chk->rec.data.ect_nonce = 0;  /* ECN Nonce */

      chk->rec.data.timetodrop = sp->ts;
      chk->flags = sp->act_flags;
      chk->addr_over = sp->addr_over;

      chk->whoTo = net;
      atomic_add_int(&chk->whoTo->ref_count, 1);

      chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
      if (sctp_logging_level & SCTP_LOG_AT_SEND_2_OUTQ) {
            sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
                (uintptr_t) stcb, sp->length,
                (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
                chk->rec.data.TSN_seq);
      }
      dchkh = mtod(chk->data, struct sctp_data_chunk *);
      /*
       * Put the rest of the things in place now. Size was done earlier in
       * previous loop prior to padding.
       */

#ifdef SCTP_ASOCLOG_OF_TSNS
      SCTP_TCB_LOCK_ASSERT(stcb);
      if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
            asoc->tsn_out_at = 0;
            asoc->tsn_out_wrapped = 1;
      }
      asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
      asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
      asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
      asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
      asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
      asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
      asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
      asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
      asoc->tsn_out_at++;
#endif

      dchkh->ch.chunk_type = SCTP_DATA;
      dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
      dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
      dchkh->dp.stream_id = htons(strq->stream_no);
      dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
      dchkh->dp.protocol_id = chk->rec.data.payloadtype;
      dchkh->ch.chunk_length = htons(chk->send_size);
      /* Now advance the chk->send_size by the actual pad needed. */
      if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
            /* need a pad */
            struct mbuf *lm;
            int pads;

            pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
            if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
                  chk->pad_inplace = 1;
            }
            if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
                  /* pad added an mbuf */
                  chk->last_mbuf = lm;
            }
            chk->send_size += pads;
      }
      /* We only re-set the policy if it is on */
      if (sp->pr_sctp_on) {
            sctp_set_prsctp_policy(stcb, sp);
            asoc->pr_sctp_cnt++;
            chk->pr_sctp_on = 1;
      } else {
            chk->pr_sctp_on = 0;
      }
      if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
            /* All done pull and kill the message */
            atomic_subtract_int(&asoc->stream_queue_cnt, 1);
            if (sp->put_last_out == 0) {
                  SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
                  SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
                      sp->sender_all_done,
                      sp->length,
                      sp->msg_is_complete,
                      sp->put_last_out,
                      send_lock_up);
            }
            if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
                  SCTP_TCB_SEND_LOCK(stcb);
                  send_lock_up = 1;
            }
            TAILQ_REMOVE(&strq->outqueue, sp, next);
            sctp_free_remote_addr(sp->net);
            if (sp->data) {
                  sctp_m_freem(sp->data);
                  sp->data = NULL;
            }
            sctp_free_a_strmoq(stcb, sp);

            /* we can't be locked to it */
            *locked = 0;
            stcb->asoc.locked_on_sending = NULL;
      } else {
            /* more to go, we are locked */
            *locked = 1;
      }
      asoc->chunks_on_out_queue++;
      TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
      asoc->send_queue_cnt++;
out_of:
      if (send_lock_up) {
            SCTP_TCB_SEND_UNLOCK(stcb);
            send_lock_up = 0;
      }
      return (to_move);
}


static struct sctp_stream_out *
sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
      struct sctp_stream_out *strq;

      /* Find the next stream to use */
      if (asoc->last_out_stream == NULL) {
            strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
            if (asoc->last_out_stream == NULL) {
                  /* huh nothing on the wheel, TSNH */
                  return (NULL);
            }
            goto done_it;
      }
      strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
done_it:
      if (strq == NULL) {
            strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
      }
      /* Save off the last stream */
      asoc->last_out_stream = strq;
      return (strq);

}


static void
sctp_fill_outqueue(struct sctp_tcb *stcb,
    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
{
      struct sctp_association *asoc;
      struct sctp_stream_out *strq, *strqn, *strqt;
      int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
      int locked, giveup;
      struct sctp_stream_queue_pending *sp;

      SCTP_TCB_LOCK_ASSERT(stcb);
      asoc = &stcb->asoc;
#ifdef INET6
      if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
            goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
      } else {
            /* ?? not sure what else to do */
            goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
      }
#else
      goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
      mtu_fromwheel = 0;
#endif
      /* Need an allowance for the data chunk header too */
      goal_mtu -= sizeof(struct sctp_data_chunk);

      /* must make even word boundary */
      goal_mtu &= 0xfffffffc;
      if (asoc->locked_on_sending) {
            /* We are stuck on one stream until the message completes. */
            strqn = strq = asoc->locked_on_sending;
            locked = 1;
      } else {
            strqn = strq = sctp_select_a_stream(stcb, asoc);
            locked = 0;
      }

      while ((goal_mtu > 0) && strq) {
            sp = TAILQ_FIRST(&strq->outqueue);
            /*
             * If CMT is off, we must validate that the stream in
             * question has the first item pointed towards are network
             * destionation requested by the caller. Note that if we
             * turn out to be locked to a stream (assigning TSN's then
             * we must stop, since we cannot look for another stream
             * with data to send to that destination). In CMT's case, by
             * skipping this check, we will send one data packet towards
             * the requested net.
             */
            if (sp == NULL) {
                  break;
            }
            if ((sp->net != net) && (sctp_cmt_on_off == 0)) {
                  /* none for this network */
                  if (locked) {
                        break;
                  } else {
                        strq = sctp_select_a_stream(stcb, asoc);
                        if (strq == NULL)
                              /* none left */
                              break;
                        if (strqn == strq) {
                              /* I have circled */
                              break;
                        }
                        continue;
                  }
            }
            giveup = 0;
            bail = 0;
            moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
                &giveup, eeor_mode, &bail);
            asoc->last_out_stream = strq;
            if (locked) {
                  asoc->locked_on_sending = strq;
                  if ((moved_how_much == 0) || (giveup) || bail)
                        /* no more to move for now */
                        break;
            } else {
                  asoc->locked_on_sending = NULL;
                  strqt = sctp_select_a_stream(stcb, asoc);
                  if (TAILQ_FIRST(&strq->outqueue) == NULL) {
                        if (strq == strqn) {
                              /* Must move start to next one */
                              strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
                              if (strqn == NULL) {
                                    strqn = TAILQ_FIRST(&asoc->out_wheel);
                                    if (strqn == NULL) {
                                          break;
                                    }
                              }
                        }
                        sctp_remove_from_wheel(stcb, asoc, strq);
                  }
                  if ((giveup) || bail) {
                        break;
                  }
                  strq = strqt;
                  if (strq == NULL) {
                        break;
                  }
            }
            total_moved += moved_how_much;
            goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
            goal_mtu &= 0xfffffffc;
      }
      if (bail)
            *quit_now = 1;

      if (total_moved == 0) {
            if ((sctp_cmt_on_off == 0) &&
                (net == stcb->asoc.primary_destination)) {
                  /* ran dry for primary network net */
                  SCTP_STAT_INCR(sctps_primary_randry);
            } else if (sctp_cmt_on_off) {
                  /* ran dry with CMT on */
                  SCTP_STAT_INCR(sctps_cmt_randry);
            }
      }
}

void
sctp_fix_ecn_echo(struct sctp_association *asoc)
{
      struct sctp_tmit_chunk *chk;

      TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
            if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
                  chk->sent = SCTP_DATAGRAM_UNSENT;
            }
      }
}

static void
sctp_move_to_an_alt(struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    struct sctp_nets *net)
{
      struct sctp_tmit_chunk *chk;
      struct sctp_nets *a_net;

      SCTP_TCB_LOCK_ASSERT(stcb);
      /*
       * JRS 5/14/07 - If CMT PF is turned on, find an alternate
       * destination using the PF algorithm for finding alternate
       * destinations.
       */
      if (sctp_cmt_on_off && sctp_cmt_pf) {
            a_net = sctp_find_alternate_net(stcb, net, 2);
      } else {
            a_net = sctp_find_alternate_net(stcb, net, 0);
      }
      if ((a_net != net) &&
          ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
            /*
             * We only proceed if a valid alternate is found that is not
             * this one and is reachable. Here we must move all chunks
             * queued in the send queue off of the destination address
             * to our alternate.
             */
            TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
                  if (chk->whoTo == net) {
                        /* Move the chunk to our alternate */
                        sctp_free_remote_addr(chk->whoTo);
                        chk->whoTo = a_net;
                        atomic_add_int(&a_net->ref_count, 1);
                  }
            }
      }
}

int
sctp_med_chunk_output(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    int *num_out,
    int *reason_code,
    int control_only, int *cwnd_full, int from_where,
    struct timeval *now, int *now_filled, int frag_point, int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
)
{
      /*
       * Ok this is the generic chunk service queue. we must do the
       * following: - Service the stream queue that is next, moving any
       * message (note I must get a complete message i.e. FIRST/MIDDLE and
       * LAST to the out queue in one pass) and assigning TSN's - Check to
       * see if the cwnd/rwnd allows any output, if so we go ahead and
       * fomulate and send the low level chunks. Making sure to combine
       * any control in the control chunk queue also.
       */
      struct sctp_nets *net;
      struct mbuf *outchain, *endoutchain;
      struct sctp_tmit_chunk *chk, *nchk;
      struct sctphdr *shdr;

      /* temp arrays for unlinking */
      struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
      int no_fragmentflg, error;
      int one_chunk, hbflag, skip_data_for_this_net;
      int asconf, cookie, no_out_cnt;
      int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
      unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
      struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
      int tsns_sent = 0;
      uint32_t auth_offset = 0;
      struct sctp_auth_chunk *auth = NULL;

      /*
       * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
       * destination.
       */
      int pf_hbflag = 0;
      int quit_now = 0;

      *num_out = 0;
      cwnd_full_ind = 0;

      if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
          (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
          (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
            eeor_mode = 1;
      } else {
            eeor_mode = 0;
      }
      ctl_cnt = no_out_cnt = asconf = cookie = 0;
      /*
       * First lets prime the pump. For each destination, if there is room
       * in the flight size, attempt to pull an MTU's worth out of the
       * stream queues into the general send_queue
       */
#ifdef SCTP_AUDITING_ENABLED
      sctp_audit_log(0xC2, 2);
#endif
      SCTP_TCB_LOCK_ASSERT(stcb);
      hbflag = 0;
      if ((control_only) || (asoc->stream_reset_outstanding))
            no_data_chunks = 1;
      else
            no_data_chunks = 0;

      /* Nothing to possible to send? */
      if (TAILQ_EMPTY(&asoc->control_send_queue) &&
          TAILQ_EMPTY(&asoc->send_queue) &&
          TAILQ_EMPTY(&asoc->out_wheel)) {
            *reason_code = 9;
            return (0);
      }
      if (asoc->peers_rwnd == 0) {
            /* No room in peers rwnd */
            *cwnd_full = 1;
            *reason_code = 1;
            if (asoc->total_flight > 0) {
                  /* we are allowed one chunk in flight */
                  no_data_chunks = 1;
            }
      }
      if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
            if (sctp_cmt_on_off) {
                  /*
                   * for CMT we start at the next one past the one we
                   * last added data to.
                   */
                  if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
                        goto skip_the_fill_from_streams;
                  }
                  if (asoc->last_net_data_came_from) {
                        net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
                        if (net == NULL) {
                              net = TAILQ_FIRST(&asoc->nets);
                        }
                  } else {
                        /* back to start */
                        net = TAILQ_FIRST(&asoc->nets);
                  }

                  /*
                   * JRI-TODO: CMT-MPI. Simply set the first
                   * destination (net) to be optimized for the next
                   * message to be pulled out of the outwheel. 1. peek
                   * at outwheel 2. If large message, set net =
                   * highest_cwnd 3. If small message, set net =
                   * lowest rtt
                   */
            } else {
                  net = asoc->primary_destination;
                  if (net == NULL) {
                        /* TSNH */
                        net = TAILQ_FIRST(&asoc->nets);
                  }
            }
            start_at = net;

one_more_time:
            for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
                  net->window_probe = 0;
                  if (old_startat && (old_startat == net)) {
                        break;
                  }
                  /*
                   * JRI: if dest is unreachable or unconfirmed, do
                   * not send data to it
                   */
                  if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
                        continue;
                  }
                  /*
                   * JRI: if dest is in PF state, do not send data to
                   * it
                   */
                  if (sctp_cmt_on_off && sctp_cmt_pf && (net->dest_state & SCTP_ADDR_PF)) {
                        continue;
                  }
                  if ((sctp_cmt_on_off == 0) && (net->ref_count < 2)) {
                        /* nothing can be in queue for this guy */
                        continue;
                  }
                  if (net->flight_size >= net->cwnd) {
                        /* skip this network, no room */
                        cwnd_full_ind++;
                        continue;
                  }
                  /*
                   * JRI : this for loop we are in takes in each net,
                   * if its's got space in cwnd and has data sent to
                   * it (when CMT is off) then it calls
                   * sctp_fill_outqueue for the net. This gets data on
                   * the send queue for that network.
                   * 
                   * In sctp_fill_outqueue TSN's are assigned and data is
                   * copied out of the stream buffers. Note mostly
                   * copy by reference (we hope).
                   */
                  if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
                        sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
                  }
                  sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
                  if (quit_now) {
                        /* memory alloc failure */
                        no_data_chunks = 1;
                        goto skip_the_fill_from_streams;
                  }
            }
            if (start_at != TAILQ_FIRST(&asoc->nets)) {
                  /* got to pick up the beginning stuff. */
                  old_startat = start_at;
                  start_at = net = TAILQ_FIRST(&asoc->nets);
                  if (old_startat)
                        goto one_more_time;
            }
      }
skip_the_fill_from_streams:
      *cwnd_full = cwnd_full_ind;

      /* now service each destination and send out what we can for it */
      /* Nothing to send? */
      if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
          (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
            *reason_code = 8;
            return (0);
      }
      if (no_data_chunks) {
            chk = TAILQ_FIRST(&asoc->control_send_queue);
      } else {
            chk = TAILQ_FIRST(&asoc->send_queue);
      }
      if (chk) {
            send_start_at = chk->whoTo;
      } else {
            send_start_at = TAILQ_FIRST(&asoc->nets);
      }
      old_startat = NULL;
again_one_more_time:
      for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
            /* how much can we send? */
            /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
            if (old_startat && (old_startat == net)) {
                  /* through list ocmpletely. */
                  break;
            }
            tsns_sent = 0;
            if (net->ref_count < 2) {
                  /*
                   * Ref-count of 1 so we cannot have data or control
                   * queued to this address. Skip it.
                   */
                  continue;
            }
            ctl_cnt = bundle_at = 0;
            endoutchain = outchain = NULL;
            no_fragmentflg = 1;
            one_chunk = 0;
            if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
                  skip_data_for_this_net = 1;
            } else {
                  skip_data_for_this_net = 0;
            }
            if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
                  /*
                   * if we have a route and an ifp check to see if we
                   * have room to send to this guy
                   */
                  struct ifnet *ifp;

                  ifp = net->ro.ro_rt->rt_ifp;
                  if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
                        SCTP_STAT_INCR(sctps_ifnomemqueued);
                        if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
                              sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
                        }
                        continue;
                  }
            }
            if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
                  mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
            } else {
                  mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
            }
            mx_mtu = mtu;
            to_out = 0;
            if (mtu > asoc->peers_rwnd) {
                  if (asoc->total_flight > 0) {
                        /* We have a packet in flight somewhere */
                        r_mtu = asoc->peers_rwnd;
                  } else {
                        /* We are always allowed to send one MTU out */
                        one_chunk = 1;
                        r_mtu = mtu;
                  }
            } else {
                  r_mtu = mtu;
            }
            /************************/
            /* Control transmission */
            /************************/
            /* Now first lets go through the control queue */
            for (chk = TAILQ_FIRST(&asoc->control_send_queue);
                chk; chk = nchk) {
                  nchk = TAILQ_NEXT(chk, sctp_next);
                  if (chk->whoTo != net) {
                        /*
                         * No, not sent to the network we are
                         * looking at
                         */
                        continue;
                  }
                  if (chk->data == NULL) {
                        continue;
                  }
                  if (chk->sent != SCTP_DATAGRAM_UNSENT) {
                        /*
                         * It must be unsent. Cookies and ASCONF's
                         * hang around but there timers will force
                         * when marked for resend.
                         */
                        continue;
                  }
                  /*
                   * if no AUTH is yet included and this chunk
                   * requires it, make sure to account for it.  We
                   * don't apply the size until the AUTH chunk is
                   * actually added below in case there is no room for
                   * this chunk. NOTE: we overload the use of "omtu"
                   * here
                   */
                  if ((auth == NULL) &&
                      sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
                      stcb->asoc.peer_auth_chunks)) {
                        omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
                  } else
                        omtu = 0;
                  /* Here we do NOT factor the r_mtu */
                  if ((chk->send_size < (int)(mtu - omtu)) ||
                      (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
                        /*
                         * We probably should glom the mbuf chain
                         * from the chk->data for control but the
                         * problem is it becomes yet one more level
                         * of tracking to do if for some reason
                         * output fails. Then I have got to
                         * reconstruct the merged control chain.. el
                         * yucko.. for now we take the easy way and
                         * do the copy
                         */
                        /*
                         * Add an AUTH chunk, if chunk requires it
                         * save the offset into the chain for AUTH
                         */
                        if ((auth == NULL) &&
                            (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
                            stcb->asoc.peer_auth_chunks))) {
                              outchain = sctp_add_auth_chunk(outchain,
                                  &endoutchain,
                                  &auth,
                                  &auth_offset,
                                  stcb,
                                  chk->rec.chunk_id.id);
                              SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
                        }
                        outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
                            (int)chk->rec.chunk_id.can_take_data,
                            chk->send_size, chk->copy_by_ref);
                        if (outchain == NULL) {
                              *reason_code = 8;
                              SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                              return (ENOMEM);
                        }
                        SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
                        /* update our MTU size */
                        if (mtu > (chk->send_size + omtu))
                              mtu -= (chk->send_size + omtu);
                        else
                              mtu = 0;
                        to_out += (chk->send_size + omtu);
                        /* Do clear IP_DF ? */
                        if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
                              no_fragmentflg = 0;
                        }
                        if (chk->rec.chunk_id.can_take_data)
                              chk->data = NULL;
                        /* Mark things to be removed, if needed */
                        if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
                            (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
                            (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
                            (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
                            (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
                            (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
                            (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
                            (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
                            (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
                            (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {

                              if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
                                    hbflag = 1;
                                    /*
                                     * JRS 5/14/07 - Set the
                                     * flag to say a heartbeat
                                     * is being sent.
                                     */
                                    pf_hbflag = 1;
                              }
                              /* remove these chunks at the end */
                              if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
                                    /* turn off the timer */
                                    if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
                                          sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
                                              inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
                                    }
                              }
                              ctl_cnt++;
                        } else {
                              /*
                               * Other chunks, since they have
                               * timers running (i.e. COOKIE or
                               * ASCONF) we just "trust" that it
                               * gets sent or retransmitted.
                               */
                              ctl_cnt++;
                              if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
                                    cookie = 1;
                                    no_out_cnt = 1;
                              } else if (chk->rec.chunk_id.id == SCTP_ASCONF) {
                                    /*
                                     * set hb flag since we can
                                     * use these for RTO
                                     */
                                    hbflag = 1;
                                    asconf = 1;
                                    /*
                                     * should sysctl this: don't
                                     * bundle data with ASCONF
                                     * since it requires AUTH
                                     */
                                    no_data_chunks = 1;
                              }
                              chk->sent = SCTP_DATAGRAM_SENT;
                              chk->snd_count++;
                        }
                        if (mtu == 0) {
                              /*
                               * Ok we are out of room but we can
                               * output without effecting the
                               * flight size since this little guy
                               * is a control only packet.
                               */
                              if (asconf) {
                                    sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
                                    /*
                                     * do NOT clear the asconf
                                     * flag as it is used to do
                                     * appropriate source
                                     * address selection.
                                     */
                              }
                              if (cookie) {
                                    sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
                                    cookie = 0;
                              }
                              SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
                              if (outchain == NULL) {
                                    /* no memory */
                                    SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
                                    error = ENOBUFS;
                                    goto error_out_again;
                              }
                              shdr = mtod(outchain, struct sctphdr *);
                              shdr->src_port = inp->sctp_lport;
                              shdr->dest_port = stcb->rport;
                              shdr->v_tag = htonl(stcb->asoc.peer_vtag);
                              shdr->checksum = 0;
                              auth_offset += sizeof(struct sctphdr);
                              if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
                                  (struct sockaddr *)&net->ro._l_addr,
                                  outchain, auth_offset, auth,
                                  no_fragmentflg, 0, NULL, asconf, so_locked))) {
                                    if (error == ENOBUFS) {
                                          asoc->ifp_had_enobuf = 1;
                                          SCTP_STAT_INCR(sctps_lowlevelerr);
                                    }
                                    if (from_where == 0) {
                                          SCTP_STAT_INCR(sctps_lowlevelerrusr);
                                    }
                        error_out_again:
                                    /* error, could not output */
                                    if (hbflag) {
                                          if (*now_filled == 0) {
                                                (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
                                                *now_filled = 1;
                                                *now = net->last_sent_time;
                                          } else {
                                                net->last_sent_time = *now;
                                          }
                                          hbflag = 0;
                                    }
                                    if (error == EHOSTUNREACH) {
                                          /*
                                           * Destination went
                                           * unreachable
                                           * during this send
                                           */
                                          sctp_move_to_an_alt(stcb, asoc, net);
                                    }
                                    *reason_code = 7;
                                    continue;
                              } else
                                    asoc->ifp_had_enobuf = 0;
                              /* Only HB or ASCONF advances time */
                              if (hbflag) {
                                    if (*now_filled == 0) {
                                          (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
                                          *now_filled = 1;
                                          *now = net->last_sent_time;
                                    } else {
                                          net->last_sent_time = *now;
                                    }
                                    hbflag = 0;
                              }
                              /*
                               * increase the number we sent, if a
                               * cookie is sent we don't tell them
                               * any was sent out.
                               */
                              outchain = endoutchain = NULL;
                              auth = NULL;
                              auth_offset = 0;
                              if (!no_out_cnt)
                                    *num_out += ctl_cnt;
                              /* recalc a clean slate and setup */
                              if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                                    mtu = (net->mtu - SCTP_MIN_OVERHEAD);
                              } else {
                                    mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
                              }
                              to_out = 0;
                              no_fragmentflg = 1;
                        }
                  }
            }
            /*********************/
            /* Data transmission */
            /*********************/
            /*
             * if AUTH for DATA is required and no AUTH has been added
             * yet, account for this in the mtu now... if no data can be
             * bundled, this adjustment won't matter anyways since the
             * packet will be going out...
             */
            if ((auth == NULL) &&
                sctp_auth_is_required_chunk(SCTP_DATA,
                stcb->asoc.peer_auth_chunks)) {
                  mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
            }
            /* now lets add any data within the MTU constraints */
            if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
                  if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
                        omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
                  else
                        omtu = 0;
            } else {
                  if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
                        omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
                  else
                        omtu = 0;
            }
            if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) && (skip_data_for_this_net == 0)) ||
                (cookie)) {
                  for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
                        if (no_data_chunks) {
                              /* let only control go out */
                              *reason_code = 1;
                              break;
                        }
                        if (net->flight_size >= net->cwnd) {
                              /* skip this net, no room for data */
                              *reason_code = 2;
                              break;
                        }
                        nchk = TAILQ_NEXT(chk, sctp_next);
                        if (chk->whoTo != net) {
                              /* No, not sent to this net */
                              continue;
                        }
                        if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
                              /*-
                               * strange, we have a chunk that is
                               * to big for its destination and
                               * yet no fragment ok flag.
                               * Something went wrong when the
                               * PMTU changed...we did not mark
                               * this chunk for some reason?? I
                               * will fix it here by letting IP
                               * fragment it for now and printing
                               * a warning. This really should not
                               * happen ...
                               */
                              SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
                                  chk->send_size, mtu);
                              chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
                        }
                        if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
                            ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
                              /* ok we will add this one */

                              /*
                               * Add an AUTH chunk, if chunk
                               * requires it, save the offset into
                               * the chain for AUTH
                               */
                              if ((auth == NULL) &&
                                  (sctp_auth_is_required_chunk(SCTP_DATA,
                                  stcb->asoc.peer_auth_chunks))) {

                                    outchain = sctp_add_auth_chunk(outchain,
                                        &endoutchain,
                                        &auth,
                                        &auth_offset,
                                        stcb,
                                        SCTP_DATA);
                                    SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
                              }
                              outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
                                  chk->send_size, chk->copy_by_ref);
                              if (outchain == NULL) {
                                    SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
                                    if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
                                          sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
                                    }
                                    *reason_code = 3;
                                    SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                                    return (ENOMEM);
                              }
                              /* upate our MTU size */
                              /* Do clear IP_DF ? */
                              if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
                                    no_fragmentflg = 0;
                              }
                              /* unsigned subtraction of mtu */
                              if (mtu > chk->send_size)
                                    mtu -= chk->send_size;
                              else
                                    mtu = 0;
                              /* unsigned subtraction of r_mtu */
                              if (r_mtu > chk->send_size)
                                    r_mtu -= chk->send_size;
                              else
                                    r_mtu = 0;

                              to_out += chk->send_size;
                              if ((to_out > mx_mtu) && no_fragmentflg) {
#ifdef INVARIANTS
                                    panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
#else
                                    SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
                                        mx_mtu, to_out);
#endif
                              }
                              chk->window_probe = 0;
                              data_list[bundle_at++] = chk;
                              if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
                                    mtu = 0;
                                    break;
                              }
                              if (chk->sent == SCTP_DATAGRAM_UNSENT) {
                                    if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
                                          SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
                                    } else {
                                          SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
                                    }
                                    if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
                                        ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
                                          /*
                                           * Count number of
                                           * user msg's that
                                           * were fragmented
                                           * we do this by
                                           * counting when we
                                           * see a LAST
                                           * fragment only.
                                           */
                                          SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
                              }
                              if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
                                    if (one_chunk) {
                                          data_list[0]->window_probe = 1;
                                          net->window_probe = 1;
                                    }
                                    break;
                              }
                        } else {
                              /*
                               * Must be sent in order of the
                               * TSN's (on a network)
                               */
                              break;
                        }
                  }     /* for (chunk gather loop for this net) */
            }           /* if asoc.state OPEN */
            /* Is there something to send for this destination? */
            if (outchain) {
                  /* We may need to start a control timer or two */
                  if (asconf) {
                        sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
                            stcb, net);
                        /*
                         * do NOT clear the asconf flag as it is
                         * used to do appropriate source address
                         * selection.
                         */
                  }
                  if (cookie) {
                        sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
                        cookie = 0;
                  }
                  /* must start a send timer if data is being sent */
                  if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
                        /*
                         * no timer running on this destination
                         * restart it.
                         */
                        sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
                  } else if (sctp_cmt_on_off && sctp_cmt_pf && pf_hbflag && ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)
                      && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
                        /*
                         * JRS 5/14/07 - If a HB has been sent to a
                         * PF destination and no T3 timer is
                         * currently running, start the T3 timer to
                         * track the HBs that were sent.
                         */
                        sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
                  }
                  /* Now send it, if there is anything to send :> */
                  SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
                  if (outchain == NULL) {
                        /* out of mbufs */
                        SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
                        error = ENOBUFS;
                        goto errored_send;
                  }
                  shdr = mtod(outchain, struct sctphdr *);
                  shdr->src_port = inp->sctp_lport;
                  shdr->dest_port = stcb->rport;
                  shdr->v_tag = htonl(stcb->asoc.peer_vtag);
                  shdr->checksum = 0;
                  auth_offset += sizeof(struct sctphdr);
                  if ((error = sctp_lowlevel_chunk_output(inp,
                      stcb,
                      net,
                      (struct sockaddr *)&net->ro._l_addr,
                      outchain,
                      auth_offset,
                      auth,
                      no_fragmentflg,
                      bundle_at,
                      data_list[0],
                      asconf, so_locked))) {
                        /* error, we could not output */
                        if (error == ENOBUFS) {
                              SCTP_STAT_INCR(sctps_lowlevelerr);
                              asoc->ifp_had_enobuf = 1;
                        }
                        if (from_where == 0) {
                              SCTP_STAT_INCR(sctps_lowlevelerrusr);
                        }
            errored_send:
                        SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
                        if (hbflag) {
                              if (*now_filled == 0) {
                                    (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
                                    *now_filled = 1;
                                    *now = net->last_sent_time;
                              } else {
                                    net->last_sent_time = *now;
                              }
                              hbflag = 0;
                        }
                        if (error == EHOSTUNREACH) {
                              /*
                               * Destination went unreachable
                               * during this send
                               */
                              sctp_move_to_an_alt(stcb, asoc, net);
                        }
                        *reason_code = 6;
                        /*-
                         * I add this line to be paranoid. As far as
                         * I can tell the continue, takes us back to
                         * the top of the for, but just to make sure
                         * I will reset these again here.
                         */
                        ctl_cnt = bundle_at = 0;
                        continue;   /* This takes us back to the
                                     * for() for the nets. */
                  } else {
                        asoc->ifp_had_enobuf = 0;
                  }
                  outchain = endoutchain = NULL;
                  auth = NULL;
                  auth_offset = 0;
                  if (bundle_at || hbflag) {
                        /* For data/asconf and hb set time */
                        if (*now_filled == 0) {
                              (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
                              *now_filled = 1;
                              *now = net->last_sent_time;
                        } else {
                              net->last_sent_time = *now;
                        }
                  }
                  if (!no_out_cnt) {
                        *num_out += (ctl_cnt + bundle_at);
                  }
                  if (bundle_at) {
                        /* setup for a RTO measurement */
                        tsns_sent = data_list[0]->rec.data.TSN_seq;
                        /* fill time if not already filled */
                        if (*now_filled == 0) {
                              (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
                              *now_filled = 1;
                              *now = asoc->time_last_sent;
                        } else {
                              asoc->time_last_sent = *now;
                        }
                        data_list[0]->do_rtt = 1;
                        SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
                        sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
                        if (sctp_early_fr) {
                              if (net->flight_size < net->cwnd) {
                                    /* start or restart it */
                                    if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
                                          sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
                                              SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
                                    }
                                    SCTP_STAT_INCR(sctps_earlyfrstrout);
                                    sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
                              } else {
                                    /* stop it if its running */
                                    if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
                                          SCTP_STAT_INCR(sctps_earlyfrstpout);
                                          sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
                                              SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
                                    }
                              }
                        }
                  }
                  if (one_chunk) {
                        break;
                  }
            }
            if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
                  sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
            }
      }
      if (old_startat == NULL) {
            old_startat = send_start_at;
            send_start_at = TAILQ_FIRST(&asoc->nets);
            if (old_startat)
                  goto again_one_more_time;
      }
      /*
       * At the end there should be no NON timed chunks hanging on this
       * queue.
       */
      if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
            sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
      }
      if ((*num_out == 0) && (*reason_code == 0)) {
            *reason_code = 4;
      } else {
            *reason_code = 5;
      }
      sctp_clean_up_ctl(stcb, asoc);
      return (0);
}

void
sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
{
      /*-
       * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
       * the control chunk queue.
       */
      struct sctp_chunkhdr *hdr;
      struct sctp_tmit_chunk *chk;
      struct mbuf *mat;

      SCTP_TCB_LOCK_ASSERT(stcb);
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            /* no memory */
            sctp_m_freem(op_err);
            return;
      }
      chk->copy_by_ref = 0;
      SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
      if (op_err == NULL) {
            sctp_free_a_chunk(stcb, chk);
            return;
      }
      chk->send_size = 0;
      mat = op_err;
      while (mat != NULL) {
            chk->send_size += SCTP_BUF_LEN(mat);
            mat = SCTP_BUF_NEXT(mat);
      }
      chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
      chk->rec.chunk_id.can_take_data = 1;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->flags = 0;
      chk->asoc = &stcb->asoc;
      chk->data = op_err;
      chk->whoTo = chk->asoc->primary_destination;
      atomic_add_int(&chk->whoTo->ref_count, 1);
      hdr = mtod(op_err, struct sctp_chunkhdr *);
      hdr->chunk_type = SCTP_OPERATION_ERROR;
      hdr->chunk_flags = 0;
      hdr->chunk_length = htons(chk->send_size);
      TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
          chk,
          sctp_next);
      chk->asoc->ctrl_queue_cnt++;
}

int
sctp_send_cookie_echo(struct mbuf *m,
    int offset,
    struct sctp_tcb *stcb,
    struct sctp_nets *net)
{
      /*-
       * pull out the cookie and put it at the front of the control chunk
       * queue.
       */
      int at;
      struct mbuf *cookie;
      struct sctp_paramhdr parm, *phdr;
      struct sctp_chunkhdr *hdr;
      struct sctp_tmit_chunk *chk;
      uint16_t ptype, plen;

      /* First find the cookie in the param area */
      cookie = NULL;
      at = offset + sizeof(struct sctp_init_chunk);

      SCTP_TCB_LOCK_ASSERT(stcb);
      do {
            phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
            if (phdr == NULL) {
                  return (-3);
            }
            ptype = ntohs(phdr->param_type);
            plen = ntohs(phdr->param_length);
            if (ptype == SCTP_STATE_COOKIE) {
                  int pad;

                  /* found the cookie */
                  if ((pad = (plen % 4))) {
                        plen += 4 - pad;
                  }
                  cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
                  if (cookie == NULL) {
                        /* No memory */
                        return (-2);
                  }
                  break;
            }
            at += SCTP_SIZE32(plen);
      } while (phdr);
      if (cookie == NULL) {
            /* Did not find the cookie */
            return (-3);
      }
      /* ok, we got the cookie lets change it into a cookie echo chunk */

      /* first the change from param to cookie */
      hdr = mtod(cookie, struct sctp_chunkhdr *);
      hdr->chunk_type = SCTP_COOKIE_ECHO;
      hdr->chunk_flags = 0;
      /* get the chunk stuff now and place it in the FRONT of the queue */
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            /* no memory */
            sctp_m_freem(cookie);
            return (-5);
      }
      chk->copy_by_ref = 0;
      chk->send_size = plen;
      chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
      chk->rec.chunk_id.can_take_data = 0;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
      chk->asoc = &stcb->asoc;
      chk->data = cookie;
      chk->whoTo = chk->asoc->primary_destination;
      atomic_add_int(&chk->whoTo->ref_count, 1);
      TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
      chk->asoc->ctrl_queue_cnt++;
      return (0);
}

void
sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
    struct mbuf *m,
    int offset,
    int chk_length,
    struct sctp_nets *net)
{
      /*
       * take a HB request and make it into a HB ack and send it.
       */
      struct mbuf *outchain;
      struct sctp_chunkhdr *chdr;
      struct sctp_tmit_chunk *chk;


      if (net == NULL)
            /* must have a net pointer */
            return;

      outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
      if (outchain == NULL) {
            /* gak out of memory */
            return;
      }
      chdr = mtod(outchain, struct sctp_chunkhdr *);
      chdr->chunk_type = SCTP_HEARTBEAT_ACK;
      chdr->chunk_flags = 0;
      if (chk_length % 4) {
            /* need pad */
            uint32_t cpthis = 0;
            int padlen;

            padlen = 4 - (chk_length % 4);
            m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
      }
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            /* no memory */
            sctp_m_freem(outchain);
            return;
      }
      chk->copy_by_ref = 0;
      chk->send_size = chk_length;
      chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
      chk->rec.chunk_id.can_take_data = 1;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->flags = 0;
      chk->asoc = &stcb->asoc;
      chk->data = outchain;
      chk->whoTo = net;
      atomic_add_int(&chk->whoTo->ref_count, 1);
      TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
      chk->asoc->ctrl_queue_cnt++;
}

void
sctp_send_cookie_ack(struct sctp_tcb *stcb)
{
      /* formulate and queue a cookie-ack back to sender */
      struct mbuf *cookie_ack;
      struct sctp_chunkhdr *hdr;
      struct sctp_tmit_chunk *chk;

      cookie_ack = NULL;
      SCTP_TCB_LOCK_ASSERT(stcb);

      cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
      if (cookie_ack == NULL) {
            /* no mbuf's */
            return;
      }
      SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            /* no memory */
            sctp_m_freem(cookie_ack);
            return;
      }
      chk->copy_by_ref = 0;
      chk->send_size = sizeof(struct sctp_chunkhdr);
      chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
      chk->rec.chunk_id.can_take_data = 1;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->flags = 0;
      chk->asoc = &stcb->asoc;
      chk->data = cookie_ack;
      if (chk->asoc->last_control_chunk_from != NULL) {
            chk->whoTo = chk->asoc->last_control_chunk_from;
      } else {
            chk->whoTo = chk->asoc->primary_destination;
      }
      atomic_add_int(&chk->whoTo->ref_count, 1);
      hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
      hdr->chunk_type = SCTP_COOKIE_ACK;
      hdr->chunk_flags = 0;
      hdr->chunk_length = htons(chk->send_size);
      SCTP_BUF_LEN(cookie_ack) = chk->send_size;
      TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
      chk->asoc->ctrl_queue_cnt++;
      return;
}


void
sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
{
      /* formulate and queue a SHUTDOWN-ACK back to the sender */
      struct mbuf *m_shutdown_ack;
      struct sctp_shutdown_ack_chunk *ack_cp;
      struct sctp_tmit_chunk *chk;

      m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
      if (m_shutdown_ack == NULL) {
            /* no mbuf's */
            return;
      }
      SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            /* no memory */
            sctp_m_freem(m_shutdown_ack);
            return;
      }
      chk->copy_by_ref = 0;
      chk->send_size = sizeof(struct sctp_chunkhdr);
      chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
      chk->rec.chunk_id.can_take_data = 1;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->flags = 0;
      chk->asoc = &stcb->asoc;
      chk->data = m_shutdown_ack;
      chk->whoTo = net;
      atomic_add_int(&net->ref_count, 1);

      ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
      ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
      ack_cp->ch.chunk_flags = 0;
      ack_cp->ch.chunk_length = htons(chk->send_size);
      SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
      TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
      chk->asoc->ctrl_queue_cnt++;
      return;
}

void
sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
{
      /* formulate and queue a SHUTDOWN to the sender */
      struct mbuf *m_shutdown;
      struct sctp_shutdown_chunk *shutdown_cp;
      struct sctp_tmit_chunk *chk;

      m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
      if (m_shutdown == NULL) {
            /* no mbuf's */
            return;
      }
      SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            /* no memory */
            sctp_m_freem(m_shutdown);
            return;
      }
      chk->copy_by_ref = 0;
      chk->send_size = sizeof(struct sctp_shutdown_chunk);
      chk->rec.chunk_id.id = SCTP_SHUTDOWN;
      chk->rec.chunk_id.can_take_data = 1;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->flags = 0;
      chk->asoc = &stcb->asoc;
      chk->data = m_shutdown;
      chk->whoTo = net;
      atomic_add_int(&net->ref_count, 1);

      shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
      shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
      shutdown_cp->ch.chunk_flags = 0;
      shutdown_cp->ch.chunk_length = htons(chk->send_size);
      shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
      SCTP_BUF_LEN(m_shutdown) = chk->send_size;
      TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
      chk->asoc->ctrl_queue_cnt++;
      return;
}

void
sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
{
      /*
       * formulate and queue an ASCONF to the peer. ASCONF parameters
       * should be queued on the assoc queue.
       */
      struct sctp_tmit_chunk *chk;
      struct mbuf *m_asconf;
      struct sctp_asconf_chunk *acp;
      int len;

      SCTP_TCB_LOCK_ASSERT(stcb);
      /* compose an ASCONF chunk, maximum length is PMTU */
      m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
      if (m_asconf == NULL) {
            return;
      }
      acp = mtod(m_asconf, struct sctp_asconf_chunk *);
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            /* no memory */
            sctp_m_freem(m_asconf);
            return;
      }
      chk->copy_by_ref = 0;
      chk->data = m_asconf;
      chk->send_size = len;
      chk->rec.chunk_id.id = SCTP_ASCONF;
      chk->rec.chunk_id.can_take_data = 0;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->flags = 0;
      chk->asoc = &stcb->asoc;
      chk->whoTo = chk->asoc->primary_destination;
      atomic_add_int(&chk->whoTo->ref_count, 1);
      TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
      chk->asoc->ctrl_queue_cnt++;
      return;
}

void
sctp_send_asconf_ack(struct sctp_tcb *stcb)
{
      /*
       * formulate and queue a asconf-ack back to sender. the asconf-ack
       * must be stored in the tcb.
       */
      struct sctp_tmit_chunk *chk;
      struct sctp_asconf_ack *ack, *latest_ack;
      struct mbuf *m_ack, *m;
      struct sctp_nets *net = NULL;

      SCTP_TCB_LOCK_ASSERT(stcb);
      /* Get the latest ASCONF-ACK */
      latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
      if (latest_ack == NULL) {
            return;
      }
      if (latest_ack->last_sent_to != NULL &&
          latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
            /* we're doing a retransmission */
            net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
            if (net == NULL) {
                  /* no alternate */
                  if (stcb->asoc.last_control_chunk_from == NULL)
                        net = stcb->asoc.primary_destination;
                  else
                        net = stcb->asoc.last_control_chunk_from;
            }
      } else {
            /* normal case */
            if (stcb->asoc.last_control_chunk_from == NULL)
                  net = stcb->asoc.primary_destination;
            else
                  net = stcb->asoc.last_control_chunk_from;
      }
      latest_ack->last_sent_to = net;

      TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
            if (ack->data == NULL) {
                  continue;
            }
            /* copy the asconf_ack */
            m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
            if (m_ack == NULL) {
                  /* couldn't copy it */
                  return;
            }
            sctp_alloc_a_chunk(stcb, chk);
            if (chk == NULL) {
                  /* no memory */
                  if (m_ack)
                        sctp_m_freem(m_ack);
                  return;
            }
            chk->copy_by_ref = 0;

            chk->whoTo = net;
            chk->data = m_ack;
            chk->send_size = 0;
            /* Get size */
            m = m_ack;
            chk->send_size = ack->len;
            chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
            chk->rec.chunk_id.can_take_data = 1;
            chk->sent = SCTP_DATAGRAM_UNSENT;
            chk->snd_count = 0;
            chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;    /* XXX */
            chk->asoc = &stcb->asoc;
            atomic_add_int(&chk->whoTo->ref_count, 1);

            TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
            chk->asoc->ctrl_queue_cnt++;
      }
      return;
}


static int
sctp_chunk_retransmission(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
)
{
      /*-
       * send out one MTU of retransmission. If fast_retransmit is
       * happening we ignore the cwnd. Otherwise we obey the cwnd and
       * rwnd. For a Cookie or Asconf in the control chunk queue we
       * retransmit them by themselves.
       *
       * For data chunks we will pick out the lowest TSN's in the sent_queue
       * marked for resend and bundle them all together (up to a MTU of
       * destination). The address to send to should have been
       * selected/changed where the retransmission was marked (i.e. in FR
       * or t3-timeout routines).
       */
      struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
      struct sctp_tmit_chunk *chk, *fwd;
      struct mbuf *m, *endofchain;
      struct sctphdr *shdr;
      int asconf;
      struct sctp_nets *net = NULL;
      uint32_t tsns_sent = 0;
      int no_fragmentflg, bundle_at, cnt_thru;
      unsigned int mtu;
      int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
      struct sctp_auth_chunk *auth = NULL;
      uint32_t auth_offset = 0;
      uint32_t dmtu = 0;

      SCTP_TCB_LOCK_ASSERT(stcb);
      tmr_started = ctl_cnt = bundle_at = error = 0;
      no_fragmentflg = 1;
      asconf = 0;
      fwd_tsn = 0;
      *cnt_out = 0;
      fwd = NULL;
      endofchain = m = NULL;
#ifdef SCTP_AUDITING_ENABLED
      sctp_audit_log(0xC3, 1);
#endif
      if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
          (TAILQ_EMPTY(&asoc->control_send_queue))) {
            SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
                asoc->sent_queue_retran_cnt);
            asoc->sent_queue_cnt = 0;
            asoc->sent_queue_cnt_removeable = 0;
            /* send back 0/0 so we enter normal transmission */
            *cnt_out = 0;
            return (0);
      }
      TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
            if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
                (chk->rec.chunk_id.id == SCTP_ASCONF) ||
                (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
                (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
                  if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
                        if (chk != asoc->str_reset) {
                              /*
                               * not eligible for retran if its
                               * not ours
                               */
                              continue;
                        }
                  }
                  ctl_cnt++;
                  if (chk->rec.chunk_id.id == SCTP_ASCONF) {
                        no_fragmentflg = 1;
                        asconf = 1;
                  }
                  if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
                        fwd_tsn = 1;
                        fwd = chk;
                  }
                  /*
                   * Add an AUTH chunk, if chunk requires it save the
                   * offset into the chain for AUTH
                   */
                  if ((auth == NULL) &&
                      (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
                      stcb->asoc.peer_auth_chunks))) {
                        m = sctp_add_auth_chunk(m, &endofchain,
                            &auth, &auth_offset,
                            stcb,
                            chk->rec.chunk_id.id);
                  }
                  m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
                  break;
            }
      }
      one_chunk = 0;
      cnt_thru = 0;
      /* do we have control chunks to retransmit? */
      if (m != NULL) {
            /* Start a timer no matter if we suceed or fail */
            if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
                  sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
            } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
                  sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);

            SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
            if (m == NULL) {
                  SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
                  return (ENOBUFS);
            }
            shdr = mtod(m, struct sctphdr *);
            shdr->src_port = inp->sctp_lport;
            shdr->dest_port = stcb->rport;
            shdr->v_tag = htonl(stcb->asoc.peer_vtag);
            shdr->checksum = 0;
            auth_offset += sizeof(struct sctphdr);
            chk->snd_count++; /* update our count */

            if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
                (struct sockaddr *)&chk->whoTo->ro._l_addr, m, auth_offset,
                auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
                  SCTP_STAT_INCR(sctps_lowlevelerr);
                  return (error);
            }
            m = endofchain = NULL;
            auth = NULL;
            auth_offset = 0;
            /*
             * We don't want to mark the net->sent time here since this
             * we use this for HB and retrans cannot measure RTT
             */
            /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
            *cnt_out += 1;
            chk->sent = SCTP_DATAGRAM_SENT;
            sctp_ucount_decr(asoc->sent_queue_retran_cnt);
            if (fwd_tsn == 0) {
                  return (0);
            } else {
                  /* Clean up the fwd-tsn list */
                  sctp_clean_up_ctl(stcb, asoc);
                  return (0);
            }
      }
      /*
       * Ok, it is just data retransmission we need to do or that and a
       * fwd-tsn with it all.
       */
      if (TAILQ_EMPTY(&asoc->sent_queue)) {
            return (SCTP_RETRAN_DONE);
      }
      if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
          (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
            /* not yet open, resend the cookie and that is it */
            return (1);
      }
#ifdef SCTP_AUDITING_ENABLED
      sctp_auditing(20, inp, stcb, NULL);
#endif
      TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
            if (chk->sent != SCTP_DATAGRAM_RESEND) {
                  /* No, not sent to this net or not ready for rtx */
                  continue;
            }
            if ((sctp_max_retran_chunk) && (chk->snd_count >= sctp_max_retran_chunk)) {
                  /* Gak, we have exceeded max unlucky retran, abort! */
                  SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
                      chk->snd_count,
                      sctp_max_retran_chunk);
                  atomic_add_int(&stcb->asoc.refcnt, 1);
                  sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
                  SCTP_TCB_LOCK(stcb);
                  atomic_subtract_int(&stcb->asoc.refcnt, 1);
                  return (SCTP_RETRAN_EXIT);
            }
            /* pick up the net */
            net = chk->whoTo;
            if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                  mtu = (net->mtu - SCTP_MIN_OVERHEAD);
            } else {
                  mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
            }

            if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
                  /* No room in peers rwnd */
                  uint32_t tsn;

                  tsn = asoc->last_acked_seq + 1;
                  if (tsn == chk->rec.data.TSN_seq) {
                        /*
                         * we make a special exception for this
                         * case. The peer has no rwnd but is missing
                         * the lowest chunk.. which is probably what
                         * is holding up the rwnd.
                         */
                        goto one_chunk_around;
                  }
                  return (1);
            }
one_chunk_around:
            if (asoc->peers_rwnd < mtu) {
                  one_chunk = 1;
                  if ((asoc->peers_rwnd == 0) &&
                      (asoc->total_flight == 0)) {
                        chk->window_probe = 1;
                        chk->whoTo->window_probe = 1;
                  }
            }
#ifdef SCTP_AUDITING_ENABLED
            sctp_audit_log(0xC3, 2);
#endif
            bundle_at = 0;
            m = NULL;
            net->fast_retran_ip = 0;
            if (chk->rec.data.doing_fast_retransmit == 0) {
                  /*
                   * if no FR in progress skip destination that have
                   * flight_size > cwnd.
                   */
                  if (net->flight_size >= net->cwnd) {
                        continue;
                  }
            } else {
                  /*
                   * Mark the destination net to have FR recovery
                   * limits put on it.
                   */
                  *fr_done = 1;
                  net->fast_retran_ip = 1;
            }

            /*
             * if no AUTH is yet included and this chunk requires it,
             * make sure to account for it.  We don't apply the size
             * until the AUTH chunk is actually added below in case
             * there is no room for this chunk.
             */
            if ((auth == NULL) &&
                sctp_auth_is_required_chunk(SCTP_DATA,
                stcb->asoc.peer_auth_chunks)) {
                  dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
            } else
                  dmtu = 0;

            if ((chk->send_size <= (mtu - dmtu)) ||
                (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
                  /* ok we will add this one */
                  if ((auth == NULL) &&
                      (sctp_auth_is_required_chunk(SCTP_DATA,
                      stcb->asoc.peer_auth_chunks))) {
                        m = sctp_add_auth_chunk(m, &endofchain,
                            &auth, &auth_offset,
                            stcb, SCTP_DATA);
                  }
                  m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
                  if (m == NULL) {
                        SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                        return (ENOMEM);
                  }
                  /* Do clear IP_DF ? */
                  if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
                        no_fragmentflg = 0;
                  }
                  /* upate our MTU size */
                  if (mtu > (chk->send_size + dmtu))
                        mtu -= (chk->send_size + dmtu);
                  else
                        mtu = 0;
                  data_list[bundle_at++] = chk;
                  if (one_chunk && (asoc->total_flight <= 0)) {
                        SCTP_STAT_INCR(sctps_windowprobed);
                  }
            }
            if (one_chunk == 0) {
                  /*
                   * now are there anymore forward from chk to pick
                   * up?
                   */
                  fwd = TAILQ_NEXT(chk, sctp_next);
                  while (fwd) {
                        if (fwd->sent != SCTP_DATAGRAM_RESEND) {
                              /* Nope, not for retran */
                              fwd = TAILQ_NEXT(fwd, sctp_next);
                              continue;
                        }
                        if (fwd->whoTo != net) {
                              /* Nope, not the net in question */
                              fwd = TAILQ_NEXT(fwd, sctp_next);
                              continue;
                        }
                        if ((auth == NULL) &&
                            sctp_auth_is_required_chunk(SCTP_DATA,
                            stcb->asoc.peer_auth_chunks)) {
                              dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
                        } else
                              dmtu = 0;
                        if (fwd->send_size <= (mtu - dmtu)) {
                              if ((auth == NULL) &&
                                  (sctp_auth_is_required_chunk(SCTP_DATA,
                                  stcb->asoc.peer_auth_chunks))) {
                                    m = sctp_add_auth_chunk(m,
                                        &endofchain,
                                        &auth, &auth_offset,
                                        stcb,
                                        SCTP_DATA);
                              }
                              m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
                              if (m == NULL) {
                                    SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                                    return (ENOMEM);
                              }
                              /* Do clear IP_DF ? */
                              if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
                                    no_fragmentflg = 0;
                              }
                              /* upate our MTU size */
                              if (mtu > (fwd->send_size + dmtu))
                                    mtu -= (fwd->send_size + dmtu);
                              else
                                    mtu = 0;
                              data_list[bundle_at++] = fwd;
                              if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
                                    break;
                              }
                              fwd = TAILQ_NEXT(fwd, sctp_next);
                        } else {
                              /* can't fit so we are done */
                              break;
                        }
                  }
            }
            /* Is there something to send for this destination? */
            if (m) {
                  /*
                   * No matter if we fail/or suceed we should start a
                   * timer. A failure is like a lost IP packet :-)
                   */
                  if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
                        /*
                         * no timer running on this destination
                         * restart it.
                         */
                        sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
                        tmr_started = 1;
                  }
                  SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
                  if (m == NULL) {
                        SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
                        return (ENOBUFS);
                  }
                  shdr = mtod(m, struct sctphdr *);
                  shdr->src_port = inp->sctp_lport;
                  shdr->dest_port = stcb->rport;
                  shdr->v_tag = htonl(stcb->asoc.peer_vtag);
                  shdr->checksum = 0;
                  auth_offset += sizeof(struct sctphdr);
                  /* Now lets send it, if there is anything to send :> */
                  if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
                      (struct sockaddr *)&net->ro._l_addr, m, auth_offset,
                      auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
                        /* error, we could not output */
                        SCTP_STAT_INCR(sctps_lowlevelerr);
                        return (error);
                  }
                  m = endofchain = NULL;
                  auth = NULL;
                  auth_offset = 0;
                  /* For HB's */
                  /*
                   * We don't want to mark the net->sent time here
                   * since this we use this for HB and retrans cannot
                   * measure RTT
                   */
                  /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */

                  /* For auto-close */
                  cnt_thru++;
                  if (*now_filled == 0) {
                        (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
                        *now = asoc->time_last_sent;
                        *now_filled = 1;
                  } else {
                        asoc->time_last_sent = *now;
                  }
                  *cnt_out += bundle_at;
#ifdef SCTP_AUDITING_ENABLED
                  sctp_audit_log(0xC4, bundle_at);
#endif
                  if (bundle_at) {
                        tsns_sent = data_list[0]->rec.data.TSN_seq;
                  }
                  for (i = 0; i < bundle_at; i++) {
                        SCTP_STAT_INCR(sctps_sendretransdata);
                        data_list[i]->sent = SCTP_DATAGRAM_SENT;
                        /*
                         * When we have a revoked data, and we
                         * retransmit it, then we clear the revoked
                         * flag since this flag dictates if we
                         * subtracted from the fs
                         */
                        if (data_list[i]->rec.data.chunk_was_revoked) {
                              /* Deflate the cwnd */
                              data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
                              data_list[i]->rec.data.chunk_was_revoked = 0;
                        }
                        data_list[i]->snd_count++;
                        sctp_ucount_decr(asoc->sent_queue_retran_cnt);
                        /* record the time */
                        data_list[i]->sent_rcv_time = asoc->time_last_sent;
                        if (data_list[i]->book_size_scale) {
                              /*
                               * need to double the book size on
                               * this one
                               */
                              data_list[i]->book_size_scale = 0;
                              /*
                               * Since we double the booksize, we
                               * must also double the output queue
                               * size, since this get shrunk when
                               * we free by this amount.
                               */
                              atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
                              data_list[i]->book_size *= 2;


                        } else {
                              if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
                                    sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
                                        asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
                              }
                              asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
                                  (uint32_t) (data_list[i]->send_size +
                                  sctp_peer_chunk_oh));
                        }
                        if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
                              sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
                                  data_list[i]->whoTo->flight_size,
                                  data_list[i]->book_size,
                                  (uintptr_t) data_list[i]->whoTo,
                                  data_list[i]->rec.data.TSN_seq);
                        }
                        sctp_flight_size_increase(data_list[i]);
                        sctp_total_flight_increase(stcb, data_list[i]);
                        if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
                              /* SWS sender side engages */
                              asoc->peers_rwnd = 0;
                        }
                        if ((i == 0) &&
                            (data_list[i]->rec.data.doing_fast_retransmit)) {
                              SCTP_STAT_INCR(sctps_sendfastretrans);
                              if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
                                  (tmr_started == 0)) {
                                    /*-
                                     * ok we just fast-retrans'd
                                     * the lowest TSN, i.e the
                                     * first on the list. In
                                     * this case we want to give
                                     * some more time to get a
                                     * SACK back without a
                                     * t3-expiring.
                                     */
                                    sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
                                        SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
                                    sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
                              }
                        }
                  }
                  if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
                        sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
                  }
#ifdef SCTP_AUDITING_ENABLED
                  sctp_auditing(21, inp, stcb, NULL);
#endif
            } else {
                  /* None will fit */
                  return (1);
            }
            if (asoc->sent_queue_retran_cnt <= 0) {
                  /* all done we have no more to retran */
                  asoc->sent_queue_retran_cnt = 0;
                  break;
            }
            if (one_chunk) {
                  /* No more room in rwnd */
                  return (1);
            }
            /* stop the for loop here. we sent out a packet */
            break;
      }
      return (0);
}


static int
sctp_timer_validation(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    int ret)
{
      struct sctp_nets *net;

      /* Validate that a timer is running somewhere */
      TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
            if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
                  /* Here is a timer */
                  return (ret);
            }
      }
      SCTP_TCB_LOCK_ASSERT(stcb);
      /* Gak, we did not have a timer somewhere */
      SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
      sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
      return (ret);
}

void
sctp_chunk_output(struct sctp_inpcb *inp,
    struct sctp_tcb *stcb,
    int from_where,
    int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
)
{
      /*-
       * Ok this is the generic chunk service queue. we must do the
       * following:
       * - See if there are retransmits pending, if so we must
       *   do these first.
       * - Service the stream queue that is next, moving any
       *   message (note I must get a complete message i.e.
       *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
       *   TSN's
       * - Check to see if the cwnd/rwnd allows any output, if so we
       *   go ahead and fomulate and send the low level chunks. Making sure
       *   to combine any control in the control chunk queue also.
       */
      struct sctp_association *asoc;
      struct sctp_nets *net;
      int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
          burst_cnt = 0, burst_limit = 0;
      struct timeval now;
      int now_filled = 0;
      int cwnd_full = 0;
      int nagle_on = 0;
      int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
      int un_sent = 0;
      int fr_done, tot_frs = 0;

      asoc = &stcb->asoc;
      if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
            if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
                  nagle_on = 0;
            } else {
                  nagle_on = 1;
            }
      }
      SCTP_TCB_LOCK_ASSERT(stcb);

      un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);

      if ((un_sent <= 0) &&
          (TAILQ_EMPTY(&asoc->control_send_queue)) &&
          (asoc->sent_queue_retran_cnt == 0)) {
            /* Nothing to do unless there is something to be sent left */
            return;
      }
      /*
       * Do we have something to send, data or control AND a sack timer
       * running, if so piggy-back the sack.
       */
      if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
            sctp_send_sack(stcb);
            (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
      }
      while (asoc->sent_queue_retran_cnt) {
            /*-
             * Ok, it is retransmission time only, we send out only ONE
             * packet with a single call off to the retran code.
             */
            if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
                  /*-
                   * Special hook for handling cookiess discarded
                   * by peer that carried data. Send cookie-ack only
                   * and then the next call with get the retran's.
                   */
                  (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
                      &cwnd_full, from_where,
                      &now, &now_filled, frag_point, so_locked);
                  return;
            } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
                  /* if its not from a HB then do it */
                  fr_done = 0;
                  ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
                  if (fr_done) {
                        tot_frs++;
                  }
            } else {
                  /*
                   * its from any other place, we don't allow retran
                   * output (only control)
                   */
                  ret = 1;
            }
            if (ret > 0) {
                  /* Can't send anymore */
                  /*-
                   * now lets push out control by calling med-level
                   * output once. this assures that we WILL send HB's
                   * if queued too.
                   */
                  (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
                      &cwnd_full, from_where,
                      &now, &now_filled, frag_point, so_locked);
#ifdef SCTP_AUDITING_ENABLED
                  sctp_auditing(8, inp, stcb, NULL);
#endif
                  (void)sctp_timer_validation(inp, stcb, asoc, ret);
                  return;
            }
            if (ret < 0) {
                  /*-
                   * The count was off.. retran is not happening so do
                   * the normal retransmission.
                   */
#ifdef SCTP_AUDITING_ENABLED
                  sctp_auditing(9, inp, stcb, NULL);
#endif
                  if (ret == SCTP_RETRAN_EXIT) {
                        return;
                  }
                  break;
            }
            if (from_where == SCTP_OUTPUT_FROM_T3) {
                  /* Only one transmission allowed out of a timeout */
#ifdef SCTP_AUDITING_ENABLED
                  sctp_auditing(10, inp, stcb, NULL);
#endif
                  /* Push out any control */
                  (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
                      &now, &now_filled, frag_point, so_locked);
                  return;
            }
            if (tot_frs > asoc->max_burst) {
                  /* Hit FR burst limit */
                  return;
            }
            if ((num_out == 0) && (ret == 0)) {

                  /* No more retrans to send */
                  break;
            }
      }
#ifdef SCTP_AUDITING_ENABLED
      sctp_auditing(12, inp, stcb, NULL);
#endif
      /* Check for bad destinations, if they exist move chunks around. */
      burst_limit = asoc->max_burst;
      TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
            if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
                SCTP_ADDR_NOT_REACHABLE) {
                  /*-
                   * if possible move things off of this address we
                   * still may send below due to the dormant state but
                   * we try to find an alternate address to send to
                   * and if we have one we move all queued data on the
                   * out wheel to this alternate address.
                   */
                  if (net->ref_count > 1)
                        sctp_move_to_an_alt(stcb, asoc, net);
            } else if (sctp_cmt_on_off && sctp_cmt_pf && ((net->dest_state & SCTP_ADDR_PF) ==
                SCTP_ADDR_PF)) {
                  /*
                   * JRS 5/14/07 - If CMT PF is on and the current
                   * destination is in PF state, move all queued data
                   * to an alternate desination.
                   */
                  if (net->ref_count > 1)
                        sctp_move_to_an_alt(stcb, asoc, net);
            } else {
                  /*-
                   * if ((asoc->sat_network) || (net->addr_is_local))
                   * { burst_limit = asoc->max_burst *
                   * SCTP_SAT_NETWORK_BURST_INCR; }
                   */
                  if (sctp_use_cwnd_based_maxburst) {
                        if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
                              /*
                               * JRS - Use the congestion control
                               * given in the congestion control
                               * module
                               */
                              asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
                              if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
                                    sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
                              }
                              SCTP_STAT_INCR(sctps_maxburstqueued);
                        }
                        net->fast_retran_ip = 0;
                  } else {
                        if (net->flight_size == 0) {
                              /* Should be decaying the cwnd here */
                              ;
                        }
                  }
            }

      }
      burst_cnt = 0;
      cwnd_full = 0;
      do {
            error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
                &reason_code, 0, &cwnd_full, from_where,
                &now, &now_filled, frag_point, so_locked);
            if (error) {
                  SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
                  if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
                        sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
                  }
                  if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
                        sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
                        sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
                  }
                  break;
            }
            SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);

            tot_out += num_out;
            burst_cnt++;
            if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
                  sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
                  if (num_out == 0) {
                        sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
                  }
            }
            if (nagle_on) {
                  /*-
                   * When nagle is on, we look at how much is un_sent, then
                   * if its smaller than an MTU and we have data in
                   * flight we stop.
                   */
                  un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
                      ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count)
                      * sizeof(struct sctp_data_chunk)));
                  if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
                      (stcb->asoc.total_flight > 0)) {
                        break;
                  }
            }
            if (TAILQ_EMPTY(&asoc->control_send_queue) &&
                TAILQ_EMPTY(&asoc->send_queue) &&
                TAILQ_EMPTY(&asoc->out_wheel)) {
                  /* Nothing left to send */
                  break;
            }
            if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
                  /* Nothing left to send */
                  break;
            }
      } while (num_out && (sctp_use_cwnd_based_maxburst ||
          (burst_cnt < burst_limit)));

      if (sctp_use_cwnd_based_maxburst == 0) {
            if (burst_cnt >= burst_limit) {
                  SCTP_STAT_INCR(sctps_maxburstqueued);
                  asoc->burst_limit_applied = 1;
                  if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
                        sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
                  }
            } else {
                  asoc->burst_limit_applied = 0;
            }
      }
      if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
            sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
          tot_out);

      /*-
       * Now we need to clean up the control chunk chain if a ECNE is on
       * it. It must be marked as UNSENT again so next call will continue
       * to send it until such time that we get a CWR, to remove it.
       */
      if (stcb->asoc.ecn_echo_cnt_onq)
            sctp_fix_ecn_echo(asoc);
      return;
}


int
sctp_output(inp, m, addr, control, p, flags)
      struct sctp_inpcb *inp;
      struct mbuf *m;
      struct sockaddr *addr;
      struct mbuf *control;
      struct thread *p;
      int flags;
{
      if (inp == NULL) {
            SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            return (EINVAL);
      }
      if (inp->sctp_socket == NULL) {
            SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            return (EINVAL);
      }
      return (sctp_sosend(inp->sctp_socket,
          addr,
          (struct uio *)NULL,
          m,
          control,
          flags, p
          ));
}

void
send_forward_tsn(struct sctp_tcb *stcb,
    struct sctp_association *asoc)
{
      struct sctp_tmit_chunk *chk;
      struct sctp_forward_tsn_chunk *fwdtsn;

      SCTP_TCB_LOCK_ASSERT(stcb);
      TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
            if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
                  /* mark it to unsent */
                  chk->sent = SCTP_DATAGRAM_UNSENT;
                  chk->snd_count = 0;
                  /* Do we correct its output location? */
                  if (chk->whoTo != asoc->primary_destination) {
                        sctp_free_remote_addr(chk->whoTo);
                        chk->whoTo = asoc->primary_destination;
                        atomic_add_int(&chk->whoTo->ref_count, 1);
                  }
                  goto sctp_fill_in_rest;
            }
      }
      /* Ok if we reach here we must build one */
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            return;
      }
      chk->copy_by_ref = 0;
      chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
      chk->rec.chunk_id.can_take_data = 0;
      chk->asoc = asoc;
      chk->whoTo = NULL;

      chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
      if (chk->data == NULL) {
            sctp_free_a_chunk(stcb, chk);
            return;
      }
      SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->whoTo = asoc->primary_destination;
      atomic_add_int(&chk->whoTo->ref_count, 1);
      TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
      asoc->ctrl_queue_cnt++;
sctp_fill_in_rest:
      /*-
       * Here we go through and fill out the part that deals with
       * stream/seq of the ones we skip.
       */
      SCTP_BUF_LEN(chk->data) = 0;
      {
            struct sctp_tmit_chunk *at, *tp1, *last;
            struct sctp_strseq *strseq;
            unsigned int cnt_of_space, i, ovh;
            unsigned int space_needed;
            unsigned int cnt_of_skipped = 0;

            TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
                  if (at->sent != SCTP_FORWARD_TSN_SKIP) {
                        /* no more to look at */
                        break;
                  }
                  if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
                        /* We don't report these */
                        continue;
                  }
                  cnt_of_skipped++;
            }
            space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
                (cnt_of_skipped * sizeof(struct sctp_strseq)));

            cnt_of_space = M_TRAILINGSPACE(chk->data);

            if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                  ovh = SCTP_MIN_OVERHEAD;
            } else {
                  ovh = SCTP_MIN_V4_OVERHEAD;
            }
            if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
                  /* trim to a mtu size */
                  cnt_of_space = asoc->smallest_mtu - ovh;
            }
            if (cnt_of_space < space_needed) {
                  /*-
                   * ok we must trim down the chunk by lowering the
                   * advance peer ack point.
                   */
                  cnt_of_skipped = (cnt_of_space -
                      ((sizeof(struct sctp_forward_tsn_chunk)) /
                      sizeof(struct sctp_strseq)));
                  /*-
                   * Go through and find the TSN that will be the one
                   * we report.
                   */
                  at = TAILQ_FIRST(&asoc->sent_queue);
                  for (i = 0; i < cnt_of_skipped; i++) {
                        tp1 = TAILQ_NEXT(at, sctp_next);
                        at = tp1;
                  }
                  last = at;
                  /*-
                   * last now points to last one I can report, update
                   * peer ack point
                   */
                  asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
                  space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
            }
            chk->send_size = space_needed;
            /* Setup the chunk */
            fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
            fwdtsn->ch.chunk_length = htons(chk->send_size);
            fwdtsn->ch.chunk_flags = 0;
            fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
            fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
            chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
                (cnt_of_skipped * sizeof(struct sctp_strseq)));
            SCTP_BUF_LEN(chk->data) = chk->send_size;
            fwdtsn++;
            /*-
             * Move pointer to after the fwdtsn and transfer to the
             * strseq pointer.
             */
            strseq = (struct sctp_strseq *)fwdtsn;
            /*-
             * Now populate the strseq list. This is done blindly
             * without pulling out duplicate stream info. This is
             * inefficent but won't harm the process since the peer will
             * look at these in sequence and will thus release anything.
             * It could mean we exceed the PMTU and chop off some that
             * we could have included.. but this is unlikely (aka 1432/4
             * would mean 300+ stream seq's would have to be reported in
             * one FWD-TSN. With a bit of work we can later FIX this to
             * optimize and pull out duplcates.. but it does add more
             * overhead. So for now... not!
             */
            at = TAILQ_FIRST(&asoc->sent_queue);
            for (i = 0; i < cnt_of_skipped; i++) {
                  tp1 = TAILQ_NEXT(at, sctp_next);
                  if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
                        /* We don't report these */
                        i--;
                        at = tp1;
                        continue;
                  }
                  strseq->stream = ntohs(at->rec.data.stream_number);
                  strseq->sequence = ntohs(at->rec.data.stream_seq);
                  strseq++;
                  at = tp1;
            }
      }
      return;

}

void
sctp_send_sack(struct sctp_tcb *stcb)
{
      /*-
       * Queue up a SACK in the control queue. We must first check to see
       * if a SACK is somehow on the control queue. If so, we will take
       * and and remove the old one.
       */
      struct sctp_association *asoc;
      struct sctp_tmit_chunk *chk, *a_chk;
      struct sctp_sack_chunk *sack;
      struct sctp_gap_ack_block *gap_descriptor;
      struct sack_track *selector;
      int mergeable = 0;
      int offset;
      caddr_t limit;
      uint32_t *dup;
      int limit_reached = 0;
      unsigned int i, jstart, siz, j;
      unsigned int num_gap_blocks = 0, space;
      int num_dups = 0;
      int space_req;

      a_chk = NULL;
      asoc = &stcb->asoc;
      SCTP_TCB_LOCK_ASSERT(stcb);
      if (asoc->last_data_chunk_from == NULL) {
            /* Hmm we never received anything */
            return;
      }
      sctp_set_rwnd(stcb, asoc);
      TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
            if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
                  /* Hmm, found a sack already on queue, remove it */
                  TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
                  asoc->ctrl_queue_cnt++;
                  a_chk = chk;
                  if (a_chk->data) {
                        sctp_m_freem(a_chk->data);
                        a_chk->data = NULL;
                  }
                  sctp_free_remote_addr(a_chk->whoTo);
                  a_chk->whoTo = NULL;
                  break;
            }
      }
      if (a_chk == NULL) {
            sctp_alloc_a_chunk(stcb, a_chk);
            if (a_chk == NULL) {
                  /* No memory so we drop the idea, and set a timer */
                  if (stcb->asoc.delayed_ack) {
                        sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
                            stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
                        sctp_timer_start(SCTP_TIMER_TYPE_RECV,
                            stcb->sctp_ep, stcb, NULL);
                  } else {
                        stcb->asoc.send_sack = 1;
                  }
                  return;
            }
            a_chk->copy_by_ref = 0;
            /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
            a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
            a_chk->rec.chunk_id.can_take_data = 1;
      }
      /* Clear our pkt counts */
      asoc->data_pkts_seen = 0;

      a_chk->asoc = asoc;
      a_chk->snd_count = 0;
      a_chk->send_size = 0;   /* fill in later */
      a_chk->sent = SCTP_DATAGRAM_UNSENT;
      a_chk->whoTo = NULL;

      if ((asoc->numduptsns) ||
          (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
          ) {
            /*-
             * Ok, we have some duplicates or the destination for the
             * sack is unreachable, lets see if we can select an
             * alternate than asoc->last_data_chunk_from
             */
            if ((!(asoc->last_data_chunk_from->dest_state &
                SCTP_ADDR_NOT_REACHABLE)) &&
                (asoc->used_alt_onsack > asoc->numnets)) {
                  /* We used an alt last time, don't this time */
                  a_chk->whoTo = NULL;
            } else {
                  asoc->used_alt_onsack++;
                  a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
            }
            if (a_chk->whoTo == NULL) {
                  /* Nope, no alternate */
                  a_chk->whoTo = asoc->last_data_chunk_from;
                  asoc->used_alt_onsack = 0;
            }
      } else {
            /*
             * No duplicates so we use the last place we received data
             * from.
             */
            asoc->used_alt_onsack = 0;
            a_chk->whoTo = asoc->last_data_chunk_from;
      }
      if (a_chk->whoTo) {
            atomic_add_int(&a_chk->whoTo->ref_count, 1);
      }
      if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
            /* no gaps */
            space_req = sizeof(struct sctp_sack_chunk);
      } else {
            /* gaps get a cluster */
            space_req = MCLBYTES;
      }
      /* Ok now lets formulate a MBUF with our sack */
      a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
      if ((a_chk->data == NULL) ||
          (a_chk->whoTo == NULL)) {
            /* rats, no mbuf memory */
            if (a_chk->data) {
                  /* was a problem with the destination */
                  sctp_m_freem(a_chk->data);
                  a_chk->data = NULL;
            }
            sctp_free_a_chunk(stcb, a_chk);
            /* sa_ignore NO_NULL_CHK */
            if (stcb->asoc.delayed_ack) {
                  sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
                      stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
                  sctp_timer_start(SCTP_TIMER_TYPE_RECV,
                      stcb->sctp_ep, stcb, NULL);
            } else {
                  stcb->asoc.send_sack = 1;
            }
            return;
      }
      /* ok, lets go through and fill it in */
      SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
      space = M_TRAILINGSPACE(a_chk->data);
      if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
            space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
      }
      limit = mtod(a_chk->data, caddr_t);
      limit += space;

      sack = mtod(a_chk->data, struct sctp_sack_chunk *);
      sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
      /* 0x01 is used by nonce for ecn */
      if ((sctp_ecn_enable) &&
          (sctp_ecn_nonce) &&
          (asoc->peer_supports_ecn_nonce))
            sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
      else
            sack->ch.chunk_flags = 0;

      if (sctp_cmt_on_off && sctp_cmt_use_dac) {
            /*-
             * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
             * received, then set high bit to 1, else 0. Reset
             * pkts_rcvd.
             */
            sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
            asoc->cmt_dac_pkts_rcvd = 0;
      }
#ifdef SCTP_ASOCLOG_OF_TSNS
      stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
      stcb->asoc.cumack_log_atsnt++;
      if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
            stcb->asoc.cumack_log_atsnt = 0;
      }
#endif
      sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
      sack->sack.a_rwnd = htonl(asoc->my_rwnd);
      asoc->my_last_reported_rwnd = asoc->my_rwnd;

      /* reset the readers interpretation */
      stcb->freed_by_sorcv_sincelast = 0;

      gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));

      siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
      if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
            offset = 1;
            /*-
             * cum-ack behind the mapping array, so we start and use all
             * entries.
             */
            jstart = 0;
      } else {
            offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
            /*-
             * we skip the first one when the cum-ack is at or above the
             * mapping array base. Note this only works if
             */
            jstart = 1;
      }
      if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
            /* we have a gap .. maybe */
            for (i = 0; i < siz; i++) {
                  selector = &sack_array[asoc->mapping_array[i]];
                  if (mergeable && selector->right_edge) {
                        /*
                         * Backup, left and right edges were ok to
                         * merge.
                         */
                        num_gap_blocks--;
                        gap_descriptor--;
                  }
                  if (selector->num_entries == 0)
                        mergeable = 0;
                  else {
                        for (j = jstart; j < selector->num_entries; j++) {
                              if (mergeable && selector->right_edge) {
                                    /*
                                     * do a merge by NOT setting
                                     * the left side
                                     */
                                    mergeable = 0;
                              } else {
                                    /*
                                     * no merge, set the left
                                     * side
                                     */
                                    mergeable = 0;
                                    gap_descriptor->start = htons((selector->gaps[j].start + offset));
                              }
                              gap_descriptor->end = htons((selector->gaps[j].end + offset));
                              num_gap_blocks++;
                              gap_descriptor++;
                              if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
                                    /* no more room */
                                    limit_reached = 1;
                                    break;
                              }
                        }
                        if (selector->left_edge) {
                              mergeable = 1;
                        }
                  }
                  if (limit_reached) {
                        /* Reached the limit stop */
                        break;
                  }
                  jstart = 0;
                  offset += 8;
            }
            if (num_gap_blocks == 0) {
                  /*
                   * slide not yet happened, and somehow we got called
                   * to send a sack. Cumack needs to move up.
                   */
                  int abort_flag = 0;

                  asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
                  sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
                  sctp_sack_check(stcb, 0, 0, &abort_flag);
            }
      }
      /* now we must add any dups we are going to report. */
      if ((limit_reached == 0) && (asoc->numduptsns)) {
            dup = (uint32_t *) gap_descriptor;
            for (i = 0; i < asoc->numduptsns; i++) {
                  *dup = htonl(asoc->dup_tsns[i]);
                  dup++;
                  num_dups++;
                  if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
                        /* no more room */
                        break;
                  }
            }
            asoc->numduptsns = 0;
      }
      /*
       * now that the chunk is prepared queue it to the control chunk
       * queue.
       */
      a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
          (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
          (num_dups * sizeof(int32_t)));
      SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
      sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
      sack->sack.num_dup_tsns = htons(num_dups);
      sack->ch.chunk_length = htons(a_chk->send_size);
      TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
      asoc->ctrl_queue_cnt++;
      asoc->send_sack = 0;
      SCTP_STAT_INCR(sctps_sendsacks);
      return;
}


void
sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
)
{
      struct mbuf *m_abort;
      struct mbuf *m_out = NULL, *m_end = NULL;
      struct sctp_abort_chunk *abort = NULL;
      int sz;
      uint32_t auth_offset = 0;
      struct sctp_auth_chunk *auth = NULL;
      struct sctphdr *shdr;

      /*-
       * Add an AUTH chunk, if chunk requires it and save the offset into
       * the chain for AUTH
       */
      if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
          stcb->asoc.peer_auth_chunks)) {
            m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
                stcb, SCTP_ABORT_ASSOCIATION);
      }
      SCTP_TCB_LOCK_ASSERT(stcb);
      m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
      if (m_abort == NULL) {
            /* no mbuf's */
            if (m_out)
                  sctp_m_freem(m_out);
            return;
      }
      /* link in any error */
      SCTP_BUF_NEXT(m_abort) = operr;
      sz = 0;
      if (operr) {
            struct mbuf *n;

            n = operr;
            while (n) {
                  sz += SCTP_BUF_LEN(n);
                  n = SCTP_BUF_NEXT(n);
            }
      }
      SCTP_BUF_LEN(m_abort) = sizeof(*abort);
      if (m_out == NULL) {
            /* NO Auth chunk prepended, so reserve space in front */
            SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
            m_out = m_abort;
      } else {
            /* Put AUTH chunk at the front of the chain */
            SCTP_BUF_NEXT(m_end) = m_abort;
      }

      /* fill in the ABORT chunk */
      abort = mtod(m_abort, struct sctp_abort_chunk *);
      abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
      abort->ch.chunk_flags = 0;
      abort->ch.chunk_length = htons(sizeof(*abort) + sz);

      /* prepend and fill in the SCTP header */
      SCTP_BUF_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
      if (m_out == NULL) {
            /* TSNH: no memory */
            return;
      }
      shdr = mtod(m_out, struct sctphdr *);
      shdr->src_port = stcb->sctp_ep->sctp_lport;
      shdr->dest_port = stcb->rport;
      shdr->v_tag = htonl(stcb->asoc.peer_vtag);
      shdr->checksum = 0;
      auth_offset += sizeof(struct sctphdr);

      (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
          stcb->asoc.primary_destination,
          (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
          m_out, auth_offset, auth, 1, 0, NULL, 0, so_locked);
      SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
}

void
sctp_send_shutdown_complete(struct sctp_tcb *stcb,
    struct sctp_nets *net)
{
      /* formulate and SEND a SHUTDOWN-COMPLETE */
      struct mbuf *m_shutdown_comp;
      struct sctp_shutdown_complete_msg *comp_cp;

      m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 0, M_DONTWAIT, 1, MT_HEADER);
      if (m_shutdown_comp == NULL) {
            /* no mbuf's */
            return;
      }
      comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
      comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
      comp_cp->shut_cmp.ch.chunk_flags = 0;
      comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
      comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
      comp_cp->sh.dest_port = stcb->rport;
      comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
      comp_cp->sh.checksum = 0;

      SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
      (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
          (struct sockaddr *)&net->ro._l_addr,
          m_shutdown_comp, 0, NULL, 1, 0, NULL, 0, SCTP_SO_NOT_LOCKED);
      SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
      return;
}

void
sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
    uint32_t vrf_id)
{
      /* formulate and SEND a SHUTDOWN-COMPLETE */
      struct mbuf *o_pak;
      struct mbuf *mout;
      struct ip *iph, *iph_out;
      struct ip6_hdr *ip6, *ip6_out;
      int offset_out, len, mlen;
      struct sctp_shutdown_complete_msg *comp_cp;

      /* Get room for the largest message */
      len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
      mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
      if (mout == NULL) {
            return;
      }
      SCTP_BUF_LEN(mout) = len;
      iph = mtod(m, struct ip *);
      iph_out = NULL;
      ip6_out = NULL;
      offset_out = 0;
      if (iph->ip_v == IPVERSION) {
            SCTP_BUF_LEN(mout) = sizeof(struct ip) +
                sizeof(struct sctp_shutdown_complete_msg);
            SCTP_BUF_NEXT(mout) = NULL;
            iph_out = mtod(mout, struct ip *);

            /* Fill in the IP header for the ABORT */
            iph_out->ip_v = IPVERSION;
            iph_out->ip_hl = (sizeof(struct ip) / 4);
            iph_out->ip_tos = (u_char)0;
            iph_out->ip_id = 0;
            iph_out->ip_off = 0;
            iph_out->ip_ttl = MAXTTL;
            iph_out->ip_p = IPPROTO_SCTP;
            iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
            iph_out->ip_dst.s_addr = iph->ip_src.s_addr;

            /* let IP layer calculate this */
            iph_out->ip_sum = 0;
            offset_out += sizeof(*iph_out);
            comp_cp = (struct sctp_shutdown_complete_msg *)(
                (caddr_t)iph_out + offset_out);
      } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
            ip6 = (struct ip6_hdr *)iph;
            SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr) +
                sizeof(struct sctp_shutdown_complete_msg);
            SCTP_BUF_NEXT(mout) = NULL;
            ip6_out = mtod(mout, struct ip6_hdr *);

            /* Fill in the IPv6 header for the ABORT */
            ip6_out->ip6_flow = ip6->ip6_flow;
            ip6_out->ip6_hlim = ip6_defhlim;
            ip6_out->ip6_nxt = IPPROTO_SCTP;
            ip6_out->ip6_src = ip6->ip6_dst;
            ip6_out->ip6_dst = ip6->ip6_src;
            /*
             * ?? The old code had both the iph len + payload, I think
             * this is wrong and would never have worked
             */
            ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
            offset_out += sizeof(*ip6_out);
            comp_cp = (struct sctp_shutdown_complete_msg *)(
                (caddr_t)ip6_out + offset_out);
      } else {
            /* Currently not supported. */
            return;
      }
      if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
            /* no mbuf's */
            sctp_m_freem(mout);
            return;
      }
      /* Now copy in and fill in the ABORT tags etc. */
      comp_cp->sh.src_port = sh->dest_port;
      comp_cp->sh.dest_port = sh->src_port;
      comp_cp->sh.checksum = 0;
      comp_cp->sh.v_tag = sh->v_tag;
      comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
      comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
      comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));

      /* add checksum */
      comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
      if (iph_out != NULL) {
            sctp_route_t ro;
            int ret;
            struct sctp_tcb *stcb = NULL;

            mlen = SCTP_BUF_LEN(mout);
            bzero(&ro, sizeof ro);
            /* set IPv4 length */
            iph_out->ip_len = mlen;
#ifdef  SCTP_PACKET_LOGGING
            if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
                  sctp_packet_log(mout, mlen);
#endif
            SCTP_ATTACH_CHAIN(o_pak, mout, mlen);

            /* out it goes */
            SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);

            /* Free the route if we got one back */
            if (ro.ro_rt)
                  RTFREE(ro.ro_rt);
      } else if (ip6_out != NULL) {
            struct route_in6 ro;
            int ret;
            struct sctp_tcb *stcb = NULL;
            struct ifnet *ifp = NULL;

            bzero(&ro, sizeof(ro));
            mlen = SCTP_BUF_LEN(mout);
#ifdef  SCTP_PACKET_LOGGING
            if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
                  sctp_packet_log(mout, mlen);
#endif
            SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
            SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);

            /* Free the route if we got one back */
            if (ro.ro_rt)
                  RTFREE(ro.ro_rt);
      }
      SCTP_STAT_INCR(sctps_sendpackets);
      SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
      SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
      return;

}

static struct sctp_nets *
sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
{
      struct sctp_nets *net, *hnet;
      int ms_goneby, highest_ms, state_overide = 0;

      (void)SCTP_GETTIME_TIMEVAL(now);
      highest_ms = 0;
      hnet = NULL;
      SCTP_TCB_LOCK_ASSERT(stcb);
      TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
            if (
                ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
                (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
                ) {
                  /*
                   * Skip this guy from consideration if HB is off AND
                   * its confirmed
                   */
                  continue;
            }
            if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
                  /* skip this dest net from consideration */
                  continue;
            }
            if (net->last_sent_time.tv_sec) {
                  /* Sent to so we subtract */
                  ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
            } else
                  /* Never been sent to */
                  ms_goneby = 0x7fffffff;
            /*-
             * When the address state is unconfirmed but still
             * considered reachable, we HB at a higher rate. Once it
             * goes confirmed OR reaches the "unreachable" state, thenw
             * we cut it back to HB at a more normal pace.
             */
            if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
                  state_overide = 1;
            } else {
                  state_overide = 0;
            }

            if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
                (ms_goneby > highest_ms)) {
                  highest_ms = ms_goneby;
                  hnet = net;
            }
      }
      if (hnet &&
          ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
            state_overide = 1;
      } else {
            state_overide = 0;
      }

      if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
            /*-
             * Found the one with longest delay bounds OR it is
             * unconfirmed and still not marked unreachable.
             */
            SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
#ifdef SCTP_DEBUG
            if (hnet) {
                  SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
                      (struct sockaddr *)&hnet->ro._l_addr);
            } else {
                  SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
            }
#endif
            /* update the timer now */
            hnet->last_sent_time = *now;
            return (hnet);
      }
      /* Nothing to HB */
      return (NULL);
}

int
sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
{
      struct sctp_tmit_chunk *chk;
      struct sctp_nets *net;
      struct sctp_heartbeat_chunk *hb;
      struct timeval now;
      struct sockaddr_in *sin;
      struct sockaddr_in6 *sin6;

      SCTP_TCB_LOCK_ASSERT(stcb);
      if (user_req == 0) {
            net = sctp_select_hb_destination(stcb, &now);
            if (net == NULL) {
                  /*-
                   * All our busy none to send to, just start the
                   * timer again.
                   */
                  if (stcb->asoc.state == 0) {
                        return (0);
                  }
                  sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
                      stcb->sctp_ep,
                      stcb,
                      net);
                  return (0);
            }
      } else {
            net = u_net;
            if (net == NULL) {
                  return (0);
            }
            (void)SCTP_GETTIME_TIMEVAL(&now);
      }
      sin = (struct sockaddr_in *)&net->ro._l_addr;
      if (sin->sin_family != AF_INET) {
            if (sin->sin_family != AF_INET6) {
                  /* huh */
                  return (0);
            }
      }
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
            return (0);
      }
      chk->copy_by_ref = 0;
      chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
      chk->rec.chunk_id.can_take_data = 1;
      chk->asoc = &stcb->asoc;
      chk->send_size = sizeof(struct sctp_heartbeat_chunk);

      chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
      if (chk->data == NULL) {
            sctp_free_a_chunk(stcb, chk);
            return (0);
      }
      SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
      SCTP_BUF_LEN(chk->data) = chk->send_size;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->whoTo = net;
      atomic_add_int(&chk->whoTo->ref_count, 1);
      /* Now we have a mbuf that we can fill in with the details */
      hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
      memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
      /* fill out chunk header */
      hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
      hb->ch.chunk_flags = 0;
      hb->ch.chunk_length = htons(chk->send_size);
      /* Fill out hb parameter */
      hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
      hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
      hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
      hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
      /* Did our user request this one, put it in */
      hb->heartbeat.hb_info.user_req = user_req;
      hb->heartbeat.hb_info.addr_family = sin->sin_family;
      hb->heartbeat.hb_info.addr_len = sin->sin_len;
      if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
            /*
             * we only take from the entropy pool if the address is not
             * confirmed.
             */
            net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
            net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
      } else {
            net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
            net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
      }
      if (sin->sin_family == AF_INET) {
            memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
      } else if (sin->sin_family == AF_INET6) {
            /* We leave the scope the way it is in our lookup table. */
            sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
            memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
      } else {
            /* huh compiler bug */
            return (0);
      }

      /*
       * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
       * PF-heartbeats.  Because of this, threshold management is done by
       * the t3 timer handler, and does not need to be done upon the send
       * of a PF-heartbeat. If CMT PF is on and the destination to which a
       * heartbeat is being sent is in PF state, do NOT do threshold
       * management.
       */
      if ((sctp_cmt_pf == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
            /* ok we have a destination that needs a beat */
            /* lets do the theshold management Qiaobing style */
            if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
                stcb->asoc.max_send_times)) {
                  /*-
                   * we have lost the association, in a way this is
                   * quite bad since we really are one less time since
                   * we really did not send yet. This is the down side
                   * to the Q's style as defined in the RFC and not my
                   * alternate style defined in the RFC.
                   */
                  if (chk->data != NULL) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  /*
                   * Here we do NOT use the macro since the
                   * association is now gone.
                   */
                  if (chk->whoTo) {
                        sctp_free_remote_addr(chk->whoTo);
                        chk->whoTo = NULL;
                  }
                  sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
                  return (-1);
            }
      }
      net->hb_responded = 0;
      TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
      stcb->asoc.ctrl_queue_cnt++;
      SCTP_STAT_INCR(sctps_sendheartbeat);
      /*-
       * Call directly med level routine to put out the chunk. It will
       * always tumble out control chunks aka HB but it may even tumble
       * out data too.
       */
      return (1);
}

void
sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
    uint32_t high_tsn)
{
      struct sctp_association *asoc;
      struct sctp_ecne_chunk *ecne;
      struct sctp_tmit_chunk *chk;

      asoc = &stcb->asoc;
      SCTP_TCB_LOCK_ASSERT(stcb);
      TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
            if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
                  /* found a previous ECN_ECHO update it if needed */
                  ecne = mtod(chk->data, struct sctp_ecne_chunk *);
                  ecne->tsn = htonl(high_tsn);
                  return;
            }
      }
      /* nope could not find one to update so we must build one */
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            return;
      }
      chk->copy_by_ref = 0;
      SCTP_STAT_INCR(sctps_sendecne);
      chk->rec.chunk_id.id = SCTP_ECN_ECHO;
      chk->rec.chunk_id.can_take_data = 0;
      chk->asoc = &stcb->asoc;
      chk->send_size = sizeof(struct sctp_ecne_chunk);
      chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
      if (chk->data == NULL) {
            sctp_free_a_chunk(stcb, chk);
            return;
      }
      SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
      SCTP_BUF_LEN(chk->data) = chk->send_size;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->whoTo = net;
      atomic_add_int(&chk->whoTo->ref_count, 1);
      stcb->asoc.ecn_echo_cnt_onq++;
      ecne = mtod(chk->data, struct sctp_ecne_chunk *);
      ecne->ch.chunk_type = SCTP_ECN_ECHO;
      ecne->ch.chunk_flags = 0;
      ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
      ecne->tsn = htonl(high_tsn);
      TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
      asoc->ctrl_queue_cnt++;
}

void
sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
    struct mbuf *m, int iphlen, int bad_crc)
{
      struct sctp_association *asoc;
      struct sctp_pktdrop_chunk *drp;
      struct sctp_tmit_chunk *chk;
      uint8_t *datap;
      int len;
      int was_trunc = 0;
      struct ip *iph;
      int fullsz = 0, extra = 0;
      long spc;
      int offset;
      struct sctp_chunkhdr *ch, chunk_buf;
      unsigned int chk_length;

      if (!stcb) {
            return;
      }
      asoc = &stcb->asoc;
      SCTP_TCB_LOCK_ASSERT(stcb);
      if (asoc->peer_supports_pktdrop == 0) {
            /*-
             * peer must declare support before I send one.
             */
            return;
      }
      if (stcb->sctp_socket == NULL) {
            return;
      }
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            return;
      }
      chk->copy_by_ref = 0;
      iph = mtod(m, struct ip *);
      if (iph == NULL) {
            sctp_free_a_chunk(stcb, chk);
            return;
      }
      if (iph->ip_v == IPVERSION) {
            /* IPv4 */
            len = chk->send_size = iph->ip_len;
      } else {
            struct ip6_hdr *ip6h;

            /* IPv6 */
            ip6h = mtod(m, struct ip6_hdr *);
            len = chk->send_size = htons(ip6h->ip6_plen);
      }
      /* Validate that we do not have an ABORT in here. */
      offset = iphlen + sizeof(struct sctphdr);
      ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
          sizeof(*ch), (uint8_t *) & chunk_buf);
      while (ch != NULL) {
            chk_length = ntohs(ch->chunk_length);
            if (chk_length < sizeof(*ch)) {
                  /* break to abort land */
                  break;
            }
            switch (ch->chunk_type) {
            case SCTP_PACKET_DROPPED:
            case SCTP_ABORT_ASSOCIATION:
                  /*-
                   * we don't respond with an PKT-DROP to an ABORT
                   * or PKT-DROP
                   */
                  sctp_free_a_chunk(stcb, chk);
                  return;
            default:
                  break;
            }
            offset += SCTP_SIZE32(chk_length);
            ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
                sizeof(*ch), (uint8_t *) & chunk_buf);
      }

      if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
          min(stcb->asoc.smallest_mtu, MCLBYTES)) {
            /*
             * only send 1 mtu worth, trim off the excess on the end.
             */
            fullsz = len - extra;
            len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
            was_trunc = 1;
      }
      chk->asoc = &stcb->asoc;
      chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
      if (chk->data == NULL) {
jump_out:
            sctp_free_a_chunk(stcb, chk);
            return;
      }
      SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
      drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
      if (drp == NULL) {
            sctp_m_freem(chk->data);
            chk->data = NULL;
            goto jump_out;
      }
      chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
          sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
      chk->book_size_scale = 0;
      if (was_trunc) {
            drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
            drp->trunc_len = htons(fullsz);
            /*
             * Len is already adjusted to size minus overhead above take
             * out the pkt_drop chunk itself from it.
             */
            chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
            len = chk->send_size;
      } else {
            /* no truncation needed */
            drp->ch.chunk_flags = 0;
            drp->trunc_len = htons(0);
      }
      if (bad_crc) {
            drp->ch.chunk_flags |= SCTP_BADCRC;
      }
      chk->send_size += sizeof(struct sctp_pktdrop_chunk);
      SCTP_BUF_LEN(chk->data) = chk->send_size;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      if (net) {
            /* we should hit here */
            chk->whoTo = net;
      } else {
            chk->whoTo = asoc->primary_destination;
      }
      atomic_add_int(&chk->whoTo->ref_count, 1);
      chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
      chk->rec.chunk_id.can_take_data = 1;
      drp->ch.chunk_type = SCTP_PACKET_DROPPED;
      drp->ch.chunk_length = htons(chk->send_size);
      spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
      if (spc < 0) {
            spc = 0;
      }
      drp->bottle_bw = htonl(spc);
      if (asoc->my_rwnd) {
            drp->current_onq = htonl(asoc->size_on_reasm_queue +
                asoc->size_on_all_streams +
                asoc->my_rwnd_control_len +
                stcb->sctp_socket->so_rcv.sb_cc);
      } else {
            /*-
             * If my rwnd is 0, possibly from mbuf depletion as well as
             * space used, tell the peer there is NO space aka onq == bw
             */
            drp->current_onq = htonl(spc);
      }
      drp->reserved = 0;
      datap = drp->data;
      m_copydata(m, iphlen, len, (caddr_t)datap);
      TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
      asoc->ctrl_queue_cnt++;
}

void
sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
{
      struct sctp_association *asoc;
      struct sctp_cwr_chunk *cwr;
      struct sctp_tmit_chunk *chk;

      asoc = &stcb->asoc;
      SCTP_TCB_LOCK_ASSERT(stcb);
      TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
            if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
                  /* found a previous ECN_CWR update it if needed */
                  cwr = mtod(chk->data, struct sctp_cwr_chunk *);
                  if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
                      MAX_TSN)) {
                        cwr->tsn = htonl(high_tsn);
                  }
                  return;
            }
      }
      /* nope could not find one to update so we must build one */
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            return;
      }
      chk->copy_by_ref = 0;
      chk->rec.chunk_id.id = SCTP_ECN_CWR;
      chk->rec.chunk_id.can_take_data = 1;
      chk->asoc = &stcb->asoc;
      chk->send_size = sizeof(struct sctp_cwr_chunk);
      chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
      if (chk->data == NULL) {
            sctp_free_a_chunk(stcb, chk);
            return;
      }
      SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
      SCTP_BUF_LEN(chk->data) = chk->send_size;
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->whoTo = net;
      atomic_add_int(&chk->whoTo->ref_count, 1);
      cwr = mtod(chk->data, struct sctp_cwr_chunk *);
      cwr->ch.chunk_type = SCTP_ECN_CWR;
      cwr->ch.chunk_flags = 0;
      cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
      cwr->tsn = htonl(high_tsn);
      TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
      asoc->ctrl_queue_cnt++;
}

void
sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
    int number_entries, uint16_t * list,
    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
{
      int len, old_len, i;
      struct sctp_stream_reset_out_request *req_out;
      struct sctp_chunkhdr *ch;

      ch = mtod(chk->data, struct sctp_chunkhdr *);


      old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

      /* get to new offset for the param. */
      req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
      /* now how long will this param be? */
      len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
      req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
      req_out->ph.param_length = htons(len);
      req_out->request_seq = htonl(seq);
      req_out->response_seq = htonl(resp_seq);
      req_out->send_reset_at_tsn = htonl(last_sent);
      if (number_entries) {
            for (i = 0; i < number_entries; i++) {
                  req_out->list_of_streams[i] = htons(list[i]);
            }
      }
      if (SCTP_SIZE32(len) > len) {
            /*-
             * Need to worry about the pad we may end up adding to the
             * end. This is easy since the struct is either aligned to 4
             * bytes or 2 bytes off.
             */
            req_out->list_of_streams[number_entries] = 0;
      }
      /* now fix the chunk length */
      ch->chunk_length = htons(len + old_len);
      chk->book_size = len + old_len;
      chk->book_size_scale = 0;
      chk->send_size = SCTP_SIZE32(chk->book_size);
      SCTP_BUF_LEN(chk->data) = chk->send_size;
      return;
}


void
sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
    int number_entries, uint16_t * list,
    uint32_t seq)
{
      int len, old_len, i;
      struct sctp_stream_reset_in_request *req_in;
      struct sctp_chunkhdr *ch;

      ch = mtod(chk->data, struct sctp_chunkhdr *);


      old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

      /* get to new offset for the param. */
      req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
      /* now how long will this param be? */
      len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
      req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
      req_in->ph.param_length = htons(len);
      req_in->request_seq = htonl(seq);
      if (number_entries) {
            for (i = 0; i < number_entries; i++) {
                  req_in->list_of_streams[i] = htons(list[i]);
            }
      }
      if (SCTP_SIZE32(len) > len) {
            /*-
             * Need to worry about the pad we may end up adding to the
             * end. This is easy since the struct is either aligned to 4
             * bytes or 2 bytes off.
             */
            req_in->list_of_streams[number_entries] = 0;
      }
      /* now fix the chunk length */
      ch->chunk_length = htons(len + old_len);
      chk->book_size = len + old_len;
      chk->book_size_scale = 0;
      chk->send_size = SCTP_SIZE32(chk->book_size);
      SCTP_BUF_LEN(chk->data) = chk->send_size;
      return;
}


void
sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
    uint32_t seq)
{
      int len, old_len;
      struct sctp_stream_reset_tsn_request *req_tsn;
      struct sctp_chunkhdr *ch;

      ch = mtod(chk->data, struct sctp_chunkhdr *);


      old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

      /* get to new offset for the param. */
      req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
      /* now how long will this param be? */
      len = sizeof(struct sctp_stream_reset_tsn_request);
      req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
      req_tsn->ph.param_length = htons(len);
      req_tsn->request_seq = htonl(seq);

      /* now fix the chunk length */
      ch->chunk_length = htons(len + old_len);
      chk->send_size = len + old_len;
      chk->book_size = SCTP_SIZE32(chk->send_size);
      chk->book_size_scale = 0;
      SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
      return;
}

void
sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
    uint32_t resp_seq, uint32_t result)
{
      int len, old_len;
      struct sctp_stream_reset_response *resp;
      struct sctp_chunkhdr *ch;

      ch = mtod(chk->data, struct sctp_chunkhdr *);


      old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

      /* get to new offset for the param. */
      resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
      /* now how long will this param be? */
      len = sizeof(struct sctp_stream_reset_response);
      resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
      resp->ph.param_length = htons(len);
      resp->response_seq = htonl(resp_seq);
      resp->result = ntohl(result);

      /* now fix the chunk length */
      ch->chunk_length = htons(len + old_len);
      chk->book_size = len + old_len;
      chk->book_size_scale = 0;
      chk->send_size = SCTP_SIZE32(chk->book_size);
      SCTP_BUF_LEN(chk->data) = chk->send_size;
      return;

}


void
sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
    uint32_t resp_seq, uint32_t result,
    uint32_t send_una, uint32_t recv_next)
{
      int len, old_len;
      struct sctp_stream_reset_response_tsn *resp;
      struct sctp_chunkhdr *ch;

      ch = mtod(chk->data, struct sctp_chunkhdr *);


      old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));

      /* get to new offset for the param. */
      resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
      /* now how long will this param be? */
      len = sizeof(struct sctp_stream_reset_response_tsn);
      resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
      resp->ph.param_length = htons(len);
      resp->response_seq = htonl(resp_seq);
      resp->result = htonl(result);
      resp->senders_next_tsn = htonl(send_una);
      resp->receivers_next_tsn = htonl(recv_next);

      /* now fix the chunk length */
      ch->chunk_length = htons(len + old_len);
      chk->book_size = len + old_len;
      chk->send_size = SCTP_SIZE32(chk->book_size);
      chk->book_size_scale = 0;
      SCTP_BUF_LEN(chk->data) = chk->send_size;
      return;
}


int
sctp_send_str_reset_req(struct sctp_tcb *stcb,
    int number_entries, uint16_t * list,
    uint8_t send_out_req, uint32_t resp_seq,
    uint8_t send_in_req,
    uint8_t send_tsn_req)
{

      struct sctp_association *asoc;
      struct sctp_tmit_chunk *chk;
      struct sctp_chunkhdr *ch;
      uint32_t seq;

      asoc = &stcb->asoc;
      if (asoc->stream_reset_outstanding) {
            /*-
             * Already one pending, must get ACK back to clear the flag.
             */
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
            return (EBUSY);
      }
      if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
            /* nothing to do */
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            return (EINVAL);
      }
      if (send_tsn_req && (send_out_req || send_in_req)) {
            /* error, can't do that */
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            return (EINVAL);
      }
      sctp_alloc_a_chunk(stcb, chk);
      if (chk == NULL) {
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
            return (ENOMEM);
      }
      chk->copy_by_ref = 0;
      chk->rec.chunk_id.id = SCTP_STREAM_RESET;
      chk->rec.chunk_id.can_take_data = 0;
      chk->asoc = &stcb->asoc;
      chk->book_size = sizeof(struct sctp_chunkhdr);
      chk->send_size = SCTP_SIZE32(chk->book_size);
      chk->book_size_scale = 0;

      chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
      if (chk->data == NULL) {
            sctp_free_a_chunk(stcb, chk);
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
            return (ENOMEM);
      }
      SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);

      /* setup chunk parameters */
      chk->sent = SCTP_DATAGRAM_UNSENT;
      chk->snd_count = 0;
      chk->whoTo = asoc->primary_destination;
      atomic_add_int(&chk->whoTo->ref_count, 1);

      ch = mtod(chk->data, struct sctp_chunkhdr *);
      ch->chunk_type = SCTP_STREAM_RESET;
      ch->chunk_flags = 0;
      ch->chunk_length = htons(chk->book_size);
      SCTP_BUF_LEN(chk->data) = chk->send_size;

      seq = stcb->asoc.str_reset_seq_out;
      if (send_out_req) {
            sctp_add_stream_reset_out(chk, number_entries, list,
                seq, resp_seq, (stcb->asoc.sending_seq - 1));
            asoc->stream_reset_out_is_outstanding = 1;
            seq++;
            asoc->stream_reset_outstanding++;
      }
      if (send_in_req) {
            sctp_add_stream_reset_in(chk, number_entries, list, seq);
            asoc->stream_reset_outstanding++;
      }
      if (send_tsn_req) {
            sctp_add_stream_reset_tsn(chk, seq);
            asoc->stream_reset_outstanding++;
      }
      asoc->str_reset = chk;

      /* insert the chunk for sending */
      TAILQ_INSERT_TAIL(&asoc->control_send_queue,
          chk,
          sctp_next);
      asoc->ctrl_queue_cnt++;
      sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
      return (0);
}

void
sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
    struct mbuf *err_cause, uint32_t vrf_id)
{
      /*-
       * Formulate the abort message, and send it back down.
       */
      struct mbuf *o_pak;
      struct mbuf *mout;
      struct sctp_abort_msg *abm;
      struct ip *iph, *iph_out;
      struct ip6_hdr *ip6, *ip6_out;
      int iphlen_out, len;

      /* don't respond to ABORT with ABORT */
      if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
            if (err_cause)
                  sctp_m_freem(err_cause);
            return;
      }
      len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));

      mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
      if (mout == NULL) {
            if (err_cause)
                  sctp_m_freem(err_cause);
            return;
      }
      iph = mtod(m, struct ip *);
      iph_out = NULL;
      ip6_out = NULL;
      if (iph->ip_v == IPVERSION) {
            iph_out = mtod(mout, struct ip *);
            SCTP_BUF_LEN(mout) = sizeof(*iph_out) + sizeof(*abm);
            SCTP_BUF_NEXT(mout) = err_cause;

            /* Fill in the IP header for the ABORT */
            iph_out->ip_v = IPVERSION;
            iph_out->ip_hl = (sizeof(struct ip) / 4);
            iph_out->ip_tos = (u_char)0;
            iph_out->ip_id = 0;
            iph_out->ip_off = 0;
            iph_out->ip_ttl = MAXTTL;
            iph_out->ip_p = IPPROTO_SCTP;
            iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
            iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
            /* let IP layer calculate this */
            iph_out->ip_sum = 0;

            iphlen_out = sizeof(*iph_out);
            abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
      } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
            ip6 = (struct ip6_hdr *)iph;
            ip6_out = mtod(mout, struct ip6_hdr *);
            SCTP_BUF_LEN(mout) = sizeof(*ip6_out) + sizeof(*abm);
            SCTP_BUF_NEXT(mout) = err_cause;

            /* Fill in the IP6 header for the ABORT */
            ip6_out->ip6_flow = ip6->ip6_flow;
            ip6_out->ip6_hlim = ip6_defhlim;
            ip6_out->ip6_nxt = IPPROTO_SCTP;
            ip6_out->ip6_src = ip6->ip6_dst;
            ip6_out->ip6_dst = ip6->ip6_src;

            iphlen_out = sizeof(*ip6_out);
            abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
      } else {
            /* Currently not supported */
            if (err_cause)
                  sctp_m_freem(err_cause);
            sctp_m_freem(mout);
            return;
      }

      abm->sh.src_port = sh->dest_port;
      abm->sh.dest_port = sh->src_port;
      abm->sh.checksum = 0;
      if (vtag == 0) {
            abm->sh.v_tag = sh->v_tag;
            abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
      } else {
            abm->sh.v_tag = htonl(vtag);
            abm->msg.ch.chunk_flags = 0;
      }
      abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;

      if (err_cause) {
            struct mbuf *m_tmp = err_cause;
            int err_len = 0;

            /* get length of the err_cause chain */
            while (m_tmp != NULL) {
                  err_len += SCTP_BUF_LEN(m_tmp);
                  m_tmp = SCTP_BUF_NEXT(m_tmp);
            }
            len = SCTP_BUF_LEN(mout) + err_len;
            if (err_len % 4) {
                  /* need pad at end of chunk */
                  uint32_t cpthis = 0;
                  int padlen;

                  padlen = 4 - (len % 4);
                  m_copyback(mout, len, padlen, (caddr_t)&cpthis);
                  len += padlen;
            }
            abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
      } else {
            len = SCTP_BUF_LEN(mout);
            abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
      }

      /* add checksum */
      abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
      if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
            /* no mbuf's */
            sctp_m_freem(mout);
            return;
      }
      if (iph_out != NULL) {
            sctp_route_t ro;
            struct sctp_tcb *stcb = NULL;
            int ret;

            /* zap the stack pointer to the route */
            bzero(&ro, sizeof ro);
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
            SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
            /* set IPv4 length */
            iph_out->ip_len = len;
            /* out it goes */
#ifdef  SCTP_PACKET_LOGGING
            if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
                  sctp_packet_log(mout, len);
#endif
            SCTP_ATTACH_CHAIN(o_pak, mout, len);
            SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);

            /* Free the route if we got one back */
            if (ro.ro_rt)
                  RTFREE(ro.ro_rt);
      } else if (ip6_out != NULL) {
            struct route_in6 ro;
            int ret;
            struct sctp_tcb *stcb = NULL;
            struct ifnet *ifp = NULL;

            /* zap the stack pointer to the route */
            bzero(&ro, sizeof(ro));
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
            SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
            ip6_out->ip6_plen = len - sizeof(*ip6_out);
#ifdef  SCTP_PACKET_LOGGING
            if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
                  sctp_packet_log(mout, len);
#endif
            SCTP_ATTACH_CHAIN(o_pak, mout, len);
            SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);

            /* Free the route if we got one back */
            if (ro.ro_rt)
                  RTFREE(ro.ro_rt);
      }
      SCTP_STAT_INCR(sctps_sendpackets);
      SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
}

void
sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
    uint32_t vrf_id)
{
      struct mbuf *o_pak;
      struct sctphdr *ihdr;
      int retcode;
      struct sctphdr *ohdr;
      struct sctp_chunkhdr *ophdr;
      struct ip *iph;
      struct mbuf *mout;

#ifdef SCTP_DEBUG
      struct sockaddr_in6 lsa6, fsa6;

#endif
      uint32_t val;
      struct mbuf *at;
      int len;

      iph = mtod(m, struct ip *);
      ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);

      SCTP_BUF_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
      if (scm == NULL) {
            /* can't send because we can't add a mbuf */
            return;
      }
      ohdr = mtod(scm, struct sctphdr *);
      ohdr->src_port = ihdr->dest_port;
      ohdr->dest_port = ihdr->src_port;
      ohdr->v_tag = vtag;
      ohdr->checksum = 0;
      ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
      ophdr->chunk_type = SCTP_OPERATION_ERROR;
      ophdr->chunk_flags = 0;
      len = 0;
      at = scm;
      while (at) {
            len += SCTP_BUF_LEN(at);
            at = SCTP_BUF_NEXT(at);
      }
      ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
      if (len % 4) {
            /* need padding */
            uint32_t cpthis = 0;
            int padlen;

            padlen = 4 - (len % 4);
            m_copyback(scm, len, padlen, (caddr_t)&cpthis);
            len += padlen;
      }
      val = sctp_calculate_sum(scm, NULL, 0);
      mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
      if (mout == NULL) {
            sctp_m_freem(scm);
            return;
      }
      SCTP_BUF_NEXT(mout) = scm;
      if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
            sctp_m_freem(mout);
            return;
      }
      ohdr->checksum = val;
      if (iph->ip_v == IPVERSION) {
            /* V4 */
            struct ip *out;
            sctp_route_t ro;
            struct sctp_tcb *stcb = NULL;

            SCTP_BUF_LEN(mout) = sizeof(struct ip);
            len += sizeof(struct ip);

            bzero(&ro, sizeof ro);
            out = mtod(mout, struct ip *);
            out->ip_v = iph->ip_v;
            out->ip_hl = (sizeof(struct ip) / 4);
            out->ip_tos = iph->ip_tos;
            out->ip_id = iph->ip_id;
            out->ip_off = 0;
            out->ip_ttl = MAXTTL;
            out->ip_p = IPPROTO_SCTP;
            out->ip_sum = 0;
            out->ip_src = iph->ip_dst;
            out->ip_dst = iph->ip_src;
            out->ip_len = len;
#ifdef  SCTP_PACKET_LOGGING
            if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
                  sctp_packet_log(mout, len);
#endif
            SCTP_ATTACH_CHAIN(o_pak, mout, len);

            SCTP_IP_OUTPUT(retcode, o_pak, &ro, stcb, vrf_id);

            SCTP_STAT_INCR(sctps_sendpackets);
            SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
            /* Free the route if we got one back */
            if (ro.ro_rt)
                  RTFREE(ro.ro_rt);
      } else {
            /* V6 */
            struct route_in6 ro;
            int ret;
            struct sctp_tcb *stcb = NULL;
            struct ifnet *ifp = NULL;
            struct ip6_hdr *out6, *in6;

            SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr);
            len += sizeof(struct ip6_hdr);
            bzero(&ro, sizeof ro);
            in6 = mtod(m, struct ip6_hdr *);
            out6 = mtod(mout, struct ip6_hdr *);
            out6->ip6_flow = in6->ip6_flow;
            out6->ip6_hlim = ip6_defhlim;
            out6->ip6_nxt = IPPROTO_SCTP;
            out6->ip6_src = in6->ip6_dst;
            out6->ip6_dst = in6->ip6_src;
            out6->ip6_plen = len - sizeof(struct ip6_hdr);

#ifdef SCTP_DEBUG
            bzero(&lsa6, sizeof(lsa6));
            lsa6.sin6_len = sizeof(lsa6);
            lsa6.sin6_family = AF_INET6;
            lsa6.sin6_addr = out6->ip6_src;
            bzero(&fsa6, sizeof(fsa6));
            fsa6.sin6_len = sizeof(fsa6);
            fsa6.sin6_family = AF_INET6;
            fsa6.sin6_addr = out6->ip6_dst;
#endif
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_operr_to calling ipv6 output:\n");
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "src: ");
            SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&lsa6);
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "dst ");
            SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&fsa6);

#ifdef  SCTP_PACKET_LOGGING
            if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
                  sctp_packet_log(mout, len);
#endif
            SCTP_ATTACH_CHAIN(o_pak, mout, len);
            SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);

            SCTP_STAT_INCR(sctps_sendpackets);
            SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
            /* Free the route if we got one back */
            if (ro.ro_rt)
                  RTFREE(ro.ro_rt);
      }
}

static struct mbuf *
sctp_copy_resume(struct sctp_stream_queue_pending *sp,
    struct uio *uio,
    struct sctp_sndrcvinfo *srcv,
    int max_send_len,
    int user_marks_eor,
    int *error,
    uint32_t * sndout,
    struct mbuf **new_tail)
{
      struct mbuf *m;

      m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
          (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
      if (m == NULL) {
            SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
            *error = ENOMEM;
      } else {
            *sndout = m_length(m, NULL);
            *new_tail = m_last(m);
      }
      return (m);
}

static int
sctp_copy_one(struct sctp_stream_queue_pending *sp,
    struct uio *uio,
    int resv_upfront)
{
      int left;

      left = sp->length;
      sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
          resv_upfront, 0);
      if (sp->data == NULL) {
            SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
            return (ENOMEM);
      }
      sp->tail_mbuf = m_last(sp->data);
      return (0);
}



static struct sctp_stream_queue_pending *
sctp_copy_it_in(struct sctp_tcb *stcb,
    struct sctp_association *asoc,
    struct sctp_sndrcvinfo *srcv,
    struct uio *uio,
    struct sctp_nets *net,
    int max_send_len,
    int user_marks_eor,
    int *error,
    int non_blocking)
{
      /*-
       * This routine must be very careful in its work. Protocol
       * processing is up and running so care must be taken to spl...()
       * when you need to do something that may effect the stcb/asoc. The
       * sb is locked however. When data is copied the protocol processing
       * should be enabled since this is a slower operation...
       */
      struct sctp_stream_queue_pending *sp = NULL;
      int resv_in_first;

      *error = 0;
      /* Now can we send this? */
      if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
          (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
          (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
          (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
            /* got data while shutting down */
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
            *error = ECONNRESET;
            goto out_now;
      }
      sctp_alloc_a_strmoq(stcb, sp);
      if (sp == NULL) {
            SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
            *error = ENOMEM;
            goto out_now;
      }
      sp->act_flags = 0;
      sp->sender_all_done = 0;
      sp->sinfo_flags = srcv->sinfo_flags;
      sp->timetolive = srcv->sinfo_timetolive;
      sp->ppid = srcv->sinfo_ppid;
      sp->context = srcv->sinfo_context;
      sp->strseq = 0;
      (void)SCTP_GETTIME_TIMEVAL(&sp->ts);

      sp->stream = srcv->sinfo_stream;
      sp->length = min(uio->uio_resid, max_send_len);
      if ((sp->length == (uint32_t) uio->uio_resid) &&
          ((user_marks_eor == 0) ||
          (srcv->sinfo_flags & SCTP_EOF) ||
          (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
            sp->msg_is_complete = 1;
      } else {
            sp->msg_is_complete = 0;
      }
      sp->sender_all_done = 0;
      sp->some_taken = 0;
      sp->put_last_out = 0;
      resv_in_first = sizeof(struct sctp_data_chunk);
      sp->data = sp->tail_mbuf = NULL;
      *error = sctp_copy_one(sp, uio, resv_in_first);
      if (*error) {
            sctp_free_a_strmoq(stcb, sp);
            sp = NULL;
      } else {
            if (sp->sinfo_flags & SCTP_ADDR_OVER) {
                  sp->net = net;
                  sp->addr_over = 1;
            } else {
                  sp->net = asoc->primary_destination;
                  sp->addr_over = 0;
            }
            atomic_add_int(&sp->net->ref_count, 1);
            sctp_set_prsctp_policy(stcb, sp);
      }
out_now:
      return (sp);
}


int
sctp_sosend(struct socket *so,
    struct sockaddr *addr,
    struct uio *uio,
    struct mbuf *top,
    struct mbuf *control,
    int flags,
    struct thread *p
)
{
      struct sctp_inpcb *inp;
      int error, use_rcvinfo = 0;
      struct sctp_sndrcvinfo srcv;

      inp = (struct sctp_inpcb *)so->so_pcb;
      if (control) {
            /* process cmsg snd/rcv info (maybe a assoc-id) */
            if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
                sizeof(srcv))) {
                  /* got one */
                  use_rcvinfo = 1;
            }
      }
      error = sctp_lower_sosend(so, addr, uio, top,
          control,
          flags,
          use_rcvinfo, &srcv
          ,p
          );
      return (error);
}


int
sctp_lower_sosend(struct socket *so,
    struct sockaddr *addr,
    struct uio *uio,
    struct mbuf *i_pak,
    struct mbuf *control,
    int flags,
    int use_rcvinfo,
    struct sctp_sndrcvinfo *srcv
    ,
    struct thread *p
)
{
      unsigned int sndlen = 0, max_len;
      int error, len;
      struct mbuf *top = NULL;

#if defined(__NetBSD__) || defined(__OpenBSD_)
      int s;

#endif
      int queue_only = 0, queue_only_for_init = 0;
      int free_cnt_applied = 0;
      int un_sent = 0;
      int now_filled = 0;
      unsigned int inqueue_bytes = 0;
      struct sctp_block_entry be;
      struct sctp_inpcb *inp;
      struct sctp_tcb *stcb = NULL;
      struct timeval now;
      struct sctp_nets *net;
      struct sctp_association *asoc;
      struct sctp_inpcb *t_inp;
      int user_marks_eor;
      int create_lock_applied = 0;
      int nagle_applies = 0;
      int some_on_control = 0;
      int got_all_of_the_send = 0;
      int hold_tcblock = 0;
      int non_blocking = 0;
      int temp_flags = 0;
      uint32_t local_add_more, local_soresv = 0;

      error = 0;
      net = NULL;
      stcb = NULL;
      asoc = NULL;

      t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
      if (inp == NULL) {
            SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
            error = EFAULT;
            if (i_pak) {
                  SCTP_RELEASE_PKT(i_pak);
            }
            return (error);
      }
      if ((uio == NULL) && (i_pak == NULL)) {
            SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            return (EINVAL);
      }
      user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
      atomic_add_int(&inp->total_sends, 1);
      if (uio) {
            if (uio->uio_resid < 0) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  return (EINVAL);
            }
            sndlen = uio->uio_resid;
      } else {
            top = SCTP_HEADER_TO_CHAIN(i_pak);
            sndlen = SCTP_HEADER_LEN(i_pak);
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
          addr,
          sndlen);
      /*-
         * Pre-screen address, if one is given the sin-len
         * must be set correctly!
         */
      if (addr) {
            if ((addr->sa_family == AF_INET) &&
                (addr->sa_len != sizeof(struct sockaddr_in))) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  error = EINVAL;
                  goto out_unlocked;
            } else if ((addr->sa_family == AF_INET6) &&
                (addr->sa_len != sizeof(struct sockaddr_in6))) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  error = EINVAL;
                  goto out_unlocked;
            }
      }
      hold_tcblock = 0;

      if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
          (inp->sctp_socket->so_qlimit)) {
            /* The listener can NOT send */
            SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
            error = EFAULT;
            goto out_unlocked;
      }
      if ((use_rcvinfo) && srcv) {
            if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
                PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  error = EINVAL;
                  goto out_unlocked;
            }
            if (srcv->sinfo_flags)
                  SCTP_STAT_INCR(sctps_sends_with_flags);

            if (srcv->sinfo_flags & SCTP_SENDALL) {
                  /* its a sendall */
                  error = sctp_sendall(inp, uio, top, srcv);
                  top = NULL;
                  goto out_unlocked;
            }
      }
      /* now we must find the assoc */
      if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
          (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
            SCTP_INP_RLOCK(inp);
            stcb = LIST_FIRST(&inp->sctp_asoc_list);
            if (stcb == NULL) {
                  SCTP_INP_RUNLOCK(inp);
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
                  error = ENOTCONN;
                  goto out_unlocked;
            }
            hold_tcblock = 0;
            SCTP_INP_RUNLOCK(inp);
            if (addr) {
                  /* Must locate the net structure if addr given */
                  net = sctp_findnet(stcb, addr);
                  if (net) {
                        /* validate port was 0 or correct */
                        struct sockaddr_in *sin;

                        sin = (struct sockaddr_in *)addr;
                        if ((sin->sin_port != 0) &&
                            (sin->sin_port != stcb->rport)) {
                              net = NULL;
                        }
                  }
                  temp_flags |= SCTP_ADDR_OVER;
            } else
                  net = stcb->asoc.primary_destination;
            if (addr && (net == NULL)) {
                  /* Could not find address, was it legal */
                  if (addr->sa_family == AF_INET) {
                        struct sockaddr_in *sin;

                        sin = (struct sockaddr_in *)addr;
                        if (sin->sin_addr.s_addr == 0) {
                              if ((sin->sin_port == 0) ||
                                  (sin->sin_port == stcb->rport)) {
                                    net = stcb->asoc.primary_destination;
                              }
                        }
                  } else {
                        struct sockaddr_in6 *sin6;

                        sin6 = (struct sockaddr_in6 *)addr;
                        if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                              if ((sin6->sin6_port == 0) ||
                                  (sin6->sin6_port == stcb->rport)) {
                                    net = stcb->asoc.primary_destination;
                              }
                        }
                  }
            }
            if (net == NULL) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  error = EINVAL;
                  goto out_unlocked;
            }
      } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
            stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
            if (stcb) {
                  if (addr)
                        /*
                         * Must locate the net structure if addr
                         * given
                         */
                        net = sctp_findnet(stcb, addr);
                  else
                        net = stcb->asoc.primary_destination;
                  if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
                      ((net == NULL) || (addr == NULL))) {
                        struct sockaddr_in *sin;

                        if (addr == NULL) {
                              SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                              error = EINVAL;
                              goto out_unlocked;
                        }
                        sin = (struct sockaddr_in *)addr;
                        /* Validate port is 0 or correct */
                        if ((sin->sin_port != 0) &&
                            (sin->sin_port != stcb->rport)) {
                              net = NULL;
                        }
                  }
            }
            hold_tcblock = 0;
      } else if (addr) {
            /*-
             * Since we did not use findep we must
             * increment it, and if we don't find a tcb
             * decrement it.
             */
            SCTP_INP_WLOCK(inp);
            SCTP_INP_INCR_REF(inp);
            SCTP_INP_WUNLOCK(inp);
            stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
            if (stcb == NULL) {
                  SCTP_INP_WLOCK(inp);
                  SCTP_INP_DECR_REF(inp);
                  SCTP_INP_WUNLOCK(inp);
            } else {
                  hold_tcblock = 1;
            }
      }
      if ((stcb == NULL) && (addr)) {
            /* Possible implicit send? */
            SCTP_ASOC_CREATE_LOCK(inp);
            create_lock_applied = 1;
            if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
                (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                  /* Should I really unlock ? */
                  SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
                  error = EFAULT;
                  goto out_unlocked;

            }
            if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
                (addr->sa_family == AF_INET6)) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  error = EINVAL;
                  goto out_unlocked;
            }
            SCTP_INP_WLOCK(inp);
            SCTP_INP_INCR_REF(inp);
            SCTP_INP_WUNLOCK(inp);
            /* With the lock applied look again */
            stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
            if (stcb == NULL) {
                  SCTP_INP_WLOCK(inp);
                  SCTP_INP_DECR_REF(inp);
                  SCTP_INP_WUNLOCK(inp);
            } else {
                  hold_tcblock = 1;
            }
            if (t_inp != inp) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
                  error = ENOTCONN;
                  goto out_unlocked;
            }
      }
      if (stcb == NULL) {
            if (addr == NULL) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
                  error = ENOENT;
                  goto out_unlocked;
            } else {
                  /*
                   * UDP style, we must go ahead and start the INIT
                   * process
                   */
                  uint32_t vrf_id;

                  if ((use_rcvinfo) && (srcv) &&
                      ((srcv->sinfo_flags & SCTP_ABORT) ||
                      ((srcv->sinfo_flags & SCTP_EOF) &&
                      (sndlen == 0)))) {
                        /*-
                         * User asks to abort a non-existant assoc,
                         * or EOF a non-existant assoc with no data
                         */
                        SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
                        error = ENOENT;
                        goto out_unlocked;
                  }
                  /* get an asoc/stcb struct */
                  vrf_id = inp->def_vrf_id;
#ifdef INVARIANTS
                  if (create_lock_applied == 0) {
                        panic("Error, should hold create lock and I don't?");
                  }
#endif
                  stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
                      p
                      );
                  if (stcb == NULL) {
                        /* Error is setup for us in the call */
                        goto out_unlocked;
                  }
                  if (create_lock_applied) {
                        SCTP_ASOC_CREATE_UNLOCK(inp);
                        create_lock_applied = 0;
                  } else {
                        SCTP_PRINTF("Huh-3? create lock should have been on??\n");
                  }
                  /*
                   * Turn on queue only flag to prevent data from
                   * being sent
                   */
                  queue_only = 1;
                  asoc = &stcb->asoc;
                  SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
                  (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);

                  /* initialize authentication params for the assoc */
                  sctp_initialize_auth_params(inp, stcb);

                  if (control) {
                        /*
                         * see if a init structure exists in cmsg
                         * headers
                         */
                        struct sctp_initmsg initm;
                        int i;

                        if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
                            sizeof(initm))) {
                              /*
                               * we have an INIT override of the
                               * default
                               */
                              if (initm.sinit_max_attempts)
                                    asoc->max_init_times = initm.sinit_max_attempts;
                              if (initm.sinit_num_ostreams)
                                    asoc->pre_open_streams = initm.sinit_num_ostreams;
                              if (initm.sinit_max_instreams)
                                    asoc->max_inbound_streams = initm.sinit_max_instreams;
                              if (initm.sinit_max_init_timeo)
                                    asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
                              if (asoc->streamoutcnt < asoc->pre_open_streams) {
                                    /* Default is NOT correct */
                                    SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
                                        asoc->streamoutcnt, asoc->pre_open_streams);
                                    /*
                                     * What happens if this
                                     * fails? we panic ...
                                     */
                                    {
                                          struct sctp_stream_out *tmp_str;
                                          int had_lock = 0;

                                          if (hold_tcblock) {
                                                had_lock = 1;
                                                SCTP_TCB_UNLOCK(stcb);
                                          }
                                          SCTP_MALLOC(tmp_str,
                                              struct sctp_stream_out *,
                                              (asoc->pre_open_streams *
                                              sizeof(struct sctp_stream_out)),
                                              SCTP_M_STRMO);
                                          if (had_lock) {
                                                SCTP_TCB_LOCK(stcb);
                                          }
                                          if (tmp_str != NULL) {
                                                SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
                                                asoc->strmout = tmp_str;
                                                asoc->streamoutcnt = asoc->pre_open_streams;
                                          } else {
                                                asoc->pre_open_streams = asoc->streamoutcnt;
                                          }
                                    }
                                    for (i = 0; i < asoc->streamoutcnt; i++) {
                                          /*-
                                             * inbound side must be set
                                             * to 0xffff, also NOTE when
                                             * we get the INIT-ACK back
                                             * (for INIT sender) we MUST
                                             * reduce the count
                                             * (streamoutcnt) but first
                                             * check if we sent to any
                                             * of the upper streams that
                                             * were dropped (if some
                                             * were). Those that were
                                             * dropped must be notified
                                             * to the upper layer as
                                             * failed to send.
                                             */
                                          asoc->strmout[i].next_sequence_sent = 0x0;
                                          TAILQ_INIT(&asoc->strmout[i].outqueue);
                                          asoc->strmout[i].stream_no = i;
                                          asoc->strmout[i].last_msg_incomplete = 0;
                                          asoc->strmout[i].next_spoke.tqe_next = 0;
                                          asoc->strmout[i].next_spoke.tqe_prev = 0;
                                    }
                              }
                        }
                  }
                  hold_tcblock = 1;
                  /* out with the INIT */
                  queue_only_for_init = 1;
                  /*-
                     * we may want to dig in after this call and adjust the MTU
                     * value. It defaulted to 1500 (constant) but the ro
                     * structure may now have an update and thus we may need to
                     * change it BEFORE we append the message.
                     */
                  net = stcb->asoc.primary_destination;
                  asoc = &stcb->asoc;
            }
      }
      if ((SCTP_SO_IS_NBIO(so)
          || (flags & MSG_NBIO)
          )) {
            non_blocking = 1;
      }
      asoc = &stcb->asoc;

      if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
            if (sndlen > asoc->smallest_mtu) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
                  error = EMSGSIZE;
                  goto out_unlocked;
            }
      }
      /* would we block? */
      if (non_blocking) {
            if (hold_tcblock == 0) {
                  SCTP_TCB_LOCK(stcb);
                  hold_tcblock = 1;
            }
            inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
            if ((SCTP_SB_LIMIT_SND(so) <
                (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
                (stcb->asoc.chunks_on_out_queue >
                sctp_max_chunks_on_queue)) {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
                  if (sndlen > SCTP_SB_LIMIT_SND(so))
                        error = EMSGSIZE;
                  else
                        error = EWOULDBLOCK;
                  goto out_unlocked;
            }
            stcb->asoc.sb_send_resv += sndlen;
            SCTP_TCB_UNLOCK(stcb);
            hold_tcblock = 0;
      } else {
            atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
      }
      local_soresv = sndlen;
      /* Keep the stcb from being freed under our feet */
      if (free_cnt_applied) {
#ifdef INVARIANTS
            panic("refcnt already incremented");
#else
            printf("refcnt:1 already incremented?\n");
#endif
      } else {
            atomic_add_int(&stcb->asoc.refcnt, 1);
            free_cnt_applied = 1;
      }
      if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
            SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
            error = ECONNRESET;
            goto out_unlocked;
      }
      if (create_lock_applied) {
            SCTP_ASOC_CREATE_UNLOCK(inp);
            create_lock_applied = 0;
      }
      if (asoc->stream_reset_outstanding) {
            /*
             * Can't queue any data while stream reset is underway.
             */
            SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
            error = EAGAIN;
            goto out_unlocked;
      }
      if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
          (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
            queue_only = 1;
      }
      if ((use_rcvinfo == 0) || (srcv == NULL)) {
            /* Grab the default stuff from the asoc */
            srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
      }
      /* we are now done with all control */
      if (control) {
            sctp_m_freem(control);
            control = NULL;
      }
      if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
          (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
          (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
          (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
            if ((use_rcvinfo) &&
                (srcv->sinfo_flags & SCTP_ABORT)) {
                  ;
            } else {
                  SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
                  error = ECONNRESET;
                  goto out_unlocked;
            }
      }
      /* Ok, we will attempt a msgsnd :> */
      if (p) {
            p->td_ru.ru_msgsnd++;
      }
      if (stcb) {
            if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
                  net = stcb->asoc.primary_destination;
            }
      }
      if (net == NULL) {
            SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            error = EINVAL;
            goto out_unlocked;
      }
      if ((net->flight_size > net->cwnd) && (sctp_cmt_on_off == 0)) {
            /*-
             * CMT: Added check for CMT above. net above is the primary
             * dest. If CMT is ON, sender should always attempt to send
             * with the output routine sctp_fill_outqueue() that loops
             * through all destination addresses. Therefore, if CMT is
             * ON, queue_only is NOT set to 1 here, so that
             * sctp_chunk_output() can be called below.
             */
            queue_only = 1;

      } else if (asoc->ifp_had_enobuf) {
            SCTP_STAT_INCR(sctps_ifnomemqueued);
            if (net->flight_size > (net->mtu * 2))
                  queue_only = 1;
            asoc->ifp_had_enobuf = 0;
      } else {
            un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
                ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
      }
      /* Are we aborting? */
      if (srcv->sinfo_flags & SCTP_ABORT) {
            struct mbuf *mm;
            int tot_demand, tot_out = 0, max_out;

            SCTP_STAT_INCR(sctps_sends_with_abort);
            if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
                (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
                  /* It has to be up before we abort */
                  /* how big is the user initiated abort? */
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  error = EINVAL;
                  goto out;
            }
            if (hold_tcblock) {
                  SCTP_TCB_UNLOCK(stcb);
                  hold_tcblock = 0;
            }
            if (top) {
                  struct mbuf *cntm = NULL;

                  mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
                  if (sndlen != 0) {
                        cntm = top;
                        while (cntm) {
                              tot_out += SCTP_BUF_LEN(cntm);
                              cntm = SCTP_BUF_NEXT(cntm);
                        }
                  }
                  tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
            } else {
                  /* Must fit in a MTU */
                  tot_out = sndlen;
                  tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
                  if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
                        /* To big */
                        SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
                        error = EMSGSIZE;
                        goto out;
                  }
                  mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
            }
            if (mm == NULL) {
                  SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
                  error = ENOMEM;
                  goto out;
            }
            max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
            max_out -= sizeof(struct sctp_abort_msg);
            if (tot_out > max_out) {
                  tot_out = max_out;
            }
            if (mm) {
                  struct sctp_paramhdr *ph;

                  /* now move forward the data pointer */
                  ph = mtod(mm, struct sctp_paramhdr *);
                  ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
                  ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
                  ph++;
                  SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
                  if (top == NULL) {
                        error = uiomove((caddr_t)ph, (int)tot_out, uio);
                        if (error) {
                              /*-
                                 * Here if we can't get his data we
                                 * still abort we just don't get to
                                 * send the users note :-0
                                 */
                              sctp_m_freem(mm);
                              mm = NULL;
                        }
                  } else {
                        if (sndlen != 0) {
                              SCTP_BUF_NEXT(mm) = top;
                        }
                  }
            }
            if (hold_tcblock == 0) {
                  SCTP_TCB_LOCK(stcb);
                  hold_tcblock = 1;
            }
            atomic_add_int(&stcb->asoc.refcnt, -1);
            free_cnt_applied = 0;
            /* release this lock, otherwise we hang on ourselves */
            sctp_abort_an_association(stcb->sctp_ep, stcb,
                SCTP_RESPONSE_TO_USER_REQ,
                mm, SCTP_SO_LOCKED);
            /* now relock the stcb so everything is sane */
            hold_tcblock = 0;
            stcb = NULL;
            /*
             * In this case top is already chained to mm avoid double
             * free, since we free it below if top != NULL and driver
             * would free it after sending the packet out
             */
            if (sndlen != 0) {
                  top = NULL;
            }
            goto out_unlocked;
      }
      /* Calculate the maximum we can send */
      inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
      if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
            if (non_blocking) {
                  /* we already checked for non-blocking above. */
                  max_len = sndlen;
            } else {
                  max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
            }
      } else {
            max_len = 0;
      }
      if (hold_tcblock) {
            SCTP_TCB_UNLOCK(stcb);
            hold_tcblock = 0;
      }
      /* Is the stream no. valid? */
      if (srcv->sinfo_stream >= asoc->streamoutcnt) {
            /* Invalid stream number */
            SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            error = EINVAL;
            goto out_unlocked;
      }
      if (asoc->strmout == NULL) {
            /* huh? software error */
            SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
            error = EFAULT;
            goto out_unlocked;
      }
      /* Unless E_EOR mode is on, we must make a send FIT in one call. */
      if ((user_marks_eor == 0) &&
          (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
            /* It will NEVER fit */
            SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
            error = EMSGSIZE;
            goto out_unlocked;
      }
      if ((uio == NULL) && user_marks_eor) {
            /*-
             * We do not support eeor mode for
             * sending with mbuf chains (like sendfile).
             */
            SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
            error = EINVAL;
            goto out_unlocked;
      }
      if (user_marks_eor) {
            local_add_more = sctp_add_more_threshold;
      } else {
            /*-
             * For non-eeor the whole message must fit in
             * the socket send buffer.
             */
            local_add_more = sndlen;
      }
      len = 0;
      if (non_blocking) {
            goto skip_preblock;
      }
      if (((max_len <= local_add_more) &&
          (SCTP_SB_LIMIT_SND(so) > local_add_more)) ||
          ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) > sctp_max_chunks_on_queue)) {    /* if */
            /* No room right no ! */
            SOCKBUF_LOCK(&so->so_snd);
            inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
            while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + sctp_add_more_threshold)) ||
                ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) > sctp_max_chunks_on_queue /* while */ )) {

                  if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
                        sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA,
                            so, asoc, sndlen);
                  }
                  be.error = 0;
                  stcb->block_entry = &be;
                  error = sbwait(&so->so_snd);
                  stcb->block_entry = NULL;
                  if (error || so->so_error || be.error) {
                        if (error == 0) {
                              if (so->so_error)
                                    error = so->so_error;
                              if (be.error) {
                                    error = be.error;
                              }
                        }
                        SOCKBUF_UNLOCK(&so->so_snd);
                        goto out_unlocked;
                  }
                  if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
                        sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
                            so, asoc, stcb->asoc.total_output_queue_size);
                  }
                  if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                        goto out_unlocked;
                  }
                  inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
            }
            inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
            if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
                  max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
            } else {
                  max_len = 0;
            }
            SOCKBUF_UNLOCK(&so->so_snd);
      }
skip_preblock:
      if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
            goto out_unlocked;
      }
      atomic_add_int(&stcb->total_sends, 1);
      /*
       * sndlen covers for mbuf case uio_resid covers for the non-mbuf
       * case NOTE: uio will be null when top/mbuf is passed
       */
      if (sndlen == 0) {
            if (srcv->sinfo_flags & SCTP_EOF) {
                  got_all_of_the_send = 1;
                  goto dataless_eof;
            } else {
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  error = EINVAL;
                  goto out;
            }
      }
      if (top == NULL) {
            struct sctp_stream_queue_pending *sp;
            struct sctp_stream_out *strm;
            uint32_t sndout, initial_out;

            initial_out = uio->uio_resid;

            SCTP_TCB_SEND_LOCK(stcb);
            if ((asoc->stream_locked) &&
                (asoc->stream_locked_on != srcv->sinfo_stream)) {
                  SCTP_TCB_SEND_UNLOCK(stcb);
                  SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
                  error = EINVAL;
                  goto out;
            }
            SCTP_TCB_SEND_UNLOCK(stcb);

            strm = &stcb->asoc.strmout[srcv->sinfo_stream];
            if (strm->last_msg_incomplete == 0) {
      do_a_copy_in:
                  sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
                  if ((sp == NULL) || (error)) {
                        goto out;
                  }
                  SCTP_TCB_SEND_LOCK(stcb);
                  if (sp->msg_is_complete) {
                        strm->last_msg_incomplete = 0;
                        asoc->stream_locked = 0;
                  } else {
                        /*
                         * Just got locked to this guy in case of an
                         * interrupt.
                         */
                        strm->last_msg_incomplete = 1;
                        asoc->stream_locked = 1;
                        asoc->stream_locked_on = srcv->sinfo_stream;
                        sp->sender_all_done = 0;
                  }
                  sctp_snd_sb_alloc(stcb, sp->length);
                  atomic_add_int(&asoc->stream_queue_cnt, 1);
                  if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
                        sp->strseq = strm->next_sequence_sent;
                        if (sctp_logging_level & SCTP_LOG_AT_SEND_2_SCTP) {
                              sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
                                  (uintptr_t) stcb, sp->length,
                                  (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
                        }
                        strm->next_sequence_sent++;
                  } else {
                        SCTP_STAT_INCR(sctps_sends_with_unord);
                  }
                  TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
                  if ((strm->next_spoke.tqe_next == NULL) &&
                      (strm->next_spoke.tqe_prev == NULL)) {
                        /* Not on wheel, insert */
                        sctp_insert_on_wheel(stcb, asoc, strm, 1);
                  }
                  SCTP_TCB_SEND_UNLOCK(stcb);
            } else {
                  SCTP_TCB_SEND_LOCK(stcb);
                  sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
                  SCTP_TCB_SEND_UNLOCK(stcb);
                  if (sp == NULL) {
                        /* ???? Huh ??? last msg is gone */
#ifdef INVARIANTS
                        panic("Warning: Last msg marked incomplete, yet nothing left?");
#else
                        SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
                        strm->last_msg_incomplete = 0;
#endif
                        goto do_a_copy_in;

                  }
            }
            while (uio->uio_resid > 0) {
                  /* How much room do we have? */
                  struct mbuf *new_tail, *mm;

                  if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
                        max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
                  else
                        max_len = 0;

                  if ((max_len > sctp_add_more_threshold) ||
                      (max_len && (SCTP_SB_LIMIT_SND(so) < sctp_add_more_threshold)) ||
                      (uio->uio_resid &&
                      (uio->uio_resid <= (int)max_len))) {
                        sndout = 0;
                        new_tail = NULL;
                        if (hold_tcblock) {
                              SCTP_TCB_UNLOCK(stcb);
                              hold_tcblock = 0;
                        }
                        mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
                        if ((mm == NULL) || error) {
                              if (mm) {
                                    sctp_m_freem(mm);
                              }
                              goto out;
                        }
                        /* Update the mbuf and count */
                        SCTP_TCB_SEND_LOCK(stcb);
                        if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                              /*
                               * we need to get out. Peer probably
                               * aborted.
                               */
                              sctp_m_freem(mm);
                              if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
                                    SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
                                    error = ECONNRESET;
                              }
                              SCTP_TCB_SEND_UNLOCK(stcb);
                              goto out;
                        }
                        if (sp->tail_mbuf) {
                              /* tack it to the end */
                              SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
                              sp->tail_mbuf = new_tail;
                        } else {
                              /* A stolen mbuf */
                              sp->data = mm;
                              sp->tail_mbuf = new_tail;
                        }
                        sctp_snd_sb_alloc(stcb, sndout);
                        atomic_add_int(&sp->length, sndout);
                        len += sndout;

                        /* Did we reach EOR? */
                        if ((uio->uio_resid == 0) &&
                            ((user_marks_eor == 0) ||
                            (srcv->sinfo_flags & SCTP_EOF) ||
                            (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
                            ) {
                              sp->msg_is_complete = 1;
                        } else {
                              sp->msg_is_complete = 0;
                        }
                        SCTP_TCB_SEND_UNLOCK(stcb);
                  }
                  if (uio->uio_resid == 0) {
                        /* got it all? */
                        continue;
                  }
                  /* PR-SCTP? */
                  if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
                        /*
                         * This is ugly but we must assure locking
                         * order
                         */
                        if (hold_tcblock == 0) {
                              SCTP_TCB_LOCK(stcb);
                              hold_tcblock = 1;
                        }
                        sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
                        inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
                        if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
                              max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
                        else
                              max_len = 0;
                        if (max_len > 0) {
                              continue;
                        }
                        SCTP_TCB_UNLOCK(stcb);
                        hold_tcblock = 0;
                  }
                  /* wait for space now */
                  if (non_blocking) {
                        /* Non-blocking io in place out */
                        goto skip_out_eof;
                  }
                  if ((net->flight_size > net->cwnd) &&
                      (sctp_cmt_on_off == 0)) {
                        queue_only = 1;
                  } else if (asoc->ifp_had_enobuf) {
                        SCTP_STAT_INCR(sctps_ifnomemqueued);
                        if (net->flight_size > (net->mtu * 2)) {
                              queue_only = 1;
                        } else {
                              queue_only = 0;
                        }
                        asoc->ifp_had_enobuf = 0;
                        un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
                            ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
                            sizeof(struct sctp_data_chunk)));
                  } else {
                        un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
                            ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
                            sizeof(struct sctp_data_chunk)));
                        if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
                              queue_only = 1;
                              SCTP_STAT_INCR(sctps_send_burst_avoid);
                        } else if (net->flight_size > net->cwnd) {
                              queue_only = 1;
                              SCTP_STAT_INCR(sctps_send_cwnd_avoid);
                        } else {
                              queue_only = 0;
                        }
                  }
                  if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
                      (stcb->asoc.total_flight > 0) &&
                      (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
                      (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
                      ) {

                        /*-
                         * Ok, Nagle is set on and we have data outstanding.
                         * Don't send anything and let SACKs drive out the
                         * data unless wen have a "full" segment to send.
                         */
                        if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
                              sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
                        }
                        SCTP_STAT_INCR(sctps_naglequeued);
                        nagle_applies = 1;
                  } else {
                        if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
                              if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
                                    sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
                        }
                        SCTP_STAT_INCR(sctps_naglesent);
                        nagle_applies = 0;
                  }
                  /* What about the INIT, send it maybe */
                  if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {

                        sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
                            nagle_applies, un_sent);
                        sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
                            stcb->asoc.total_flight,
                            stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
                  }
                  if (queue_only_for_init) {
                        if (hold_tcblock == 0) {
                              SCTP_TCB_LOCK(stcb);
                              hold_tcblock = 1;
                        }
                        if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
                              /* a collision took us forward? */
                              queue_only_for_init = 0;
                              queue_only = 0;
                        } else {
                              sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
                              SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
                              queue_only_for_init = 0;
                              queue_only = 1;
                        }
                  }
                  if ((queue_only == 0) && (nagle_applies == 0)
                      ) {
                        /*-
                         * need to start chunk output
                         * before blocking.. note that if
                         * a lock is already applied, then
                         * the input via the net is happening
                         * and I don't need to start output :-D
                         */
                        if (hold_tcblock == 0) {
                              if (SCTP_TCB_TRYLOCK(stcb)) {
                                    hold_tcblock = 1;
                                    sctp_chunk_output(inp,
                                        stcb,
                                        SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
                              }
                        } else {
                              sctp_chunk_output(inp,
                                  stcb,
                                  SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
                        }
                        if (hold_tcblock == 1) {
                              SCTP_TCB_UNLOCK(stcb);
                              hold_tcblock = 0;
                        }
                  }
                  SOCKBUF_LOCK(&so->so_snd);
                  /*-
                     * This is a bit strange, but I think it will
                     * work. The total_output_queue_size is locked and
                     * protected by the TCB_LOCK, which we just released.
                     * There is a race that can occur between releasing it
                     * above, and me getting the socket lock, where sacks
                     * come in but we have not put the SB_WAIT on the
                     * so_snd buffer to get the wakeup. After the LOCK
                     * is applied the sack_processing will also need to
                     * LOCK the so->so_snd to do the actual sowwakeup(). So
                     * once we have the socket buffer lock if we recheck the
                     * size we KNOW we will get to sleep safely with the
                     * wakeup flag in place.
                     */
                  if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
                      min(sctp_add_more_threshold, SCTP_SB_LIMIT_SND(so)))
                      ) {
                        if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
                              sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
                                  so, asoc, uio->uio_resid);
                        }
                        be.error = 0;
                        stcb->block_entry = &be;
                        error = sbwait(&so->so_snd);
                        stcb->block_entry = NULL;

                        if (error || so->so_error || be.error) {
                              if (error == 0) {
                                    if (so->so_error)
                                          error = so->so_error;
                                    if (be.error) {
                                          error = be.error;
                                    }
                              }
                              SOCKBUF_UNLOCK(&so->so_snd);
                              goto out_unlocked;
                        }
                        if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
                              sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
                                  so, asoc, stcb->asoc.total_output_queue_size);
                        }
                  }
                  SOCKBUF_UNLOCK(&so->so_snd);
                  if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                        goto out_unlocked;
                  }
            }
            SCTP_TCB_SEND_LOCK(stcb);
            if (sp) {
                  if (sp->msg_is_complete == 0) {
                        strm->last_msg_incomplete = 1;
                        asoc->stream_locked = 1;
                        asoc->stream_locked_on = srcv->sinfo_stream;
                  } else {
                        sp->sender_all_done = 1;
                        strm->last_msg_incomplete = 0;
                        asoc->stream_locked = 0;
                  }
            } else {
                  SCTP_PRINTF("Huh no sp TSNH?\n");
                  strm->last_msg_incomplete = 0;
                  asoc->stream_locked = 0;
            }
            SCTP_TCB_SEND_UNLOCK(stcb);
            if (uio->uio_resid == 0) {
                  got_all_of_the_send = 1;
            }
      } else if (top) {
            /* We send in a 0, since we do NOT have any locks */
            error = sctp_msg_append(stcb, net, top, srcv, 0);
            top = NULL;
            if (srcv->sinfo_flags & SCTP_EOF) {
                  /*
                   * This should only happen for Panda for the mbuf
                   * send case, which does NOT yet support EEOR mode.
                   * Thus, we can just set this flag to do the proper
                   * EOF handling.
                   */
                  got_all_of_the_send = 1;
            }
      }
      if (error) {
            goto out;
      }
dataless_eof:
      /* EOF thing ? */
      if ((srcv->sinfo_flags & SCTP_EOF) &&
          (got_all_of_the_send == 1) &&
          (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)
          ) {
            int cnt;

            SCTP_STAT_INCR(sctps_sends_with_eof);
            error = 0;
            if (hold_tcblock == 0) {
                  SCTP_TCB_LOCK(stcb);
                  hold_tcblock = 1;
            }
            cnt = sctp_is_there_unsent_data(stcb);
            if (TAILQ_EMPTY(&asoc->send_queue) &&
                TAILQ_EMPTY(&asoc->sent_queue) &&
                (cnt == 0)) {
                  if (asoc->locked_on_sending) {
                        goto abort_anyway;
                  }
                  /* there is nothing queued to send, so I'm done... */
                  if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
                      (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
                      (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
                        /* only send SHUTDOWN the first time through */
                        sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
                        if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
                              SCTP_STAT_DECR_GAUGE32(sctps_currestab);
                        }
                        SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
                        SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
                        sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
                            asoc->primary_destination);
                        sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
                            asoc->primary_destination);
                  }
            } else {
                  /*-
                     * we still got (or just got) data to send, so set
                     * SHUTDOWN_PENDING
                     */
                  /*-
                     * XXX sockets draft says that SCTP_EOF should be
                     * sent with no data.  currently, we will allow user
                     * data to be sent first and move to
                     * SHUTDOWN-PENDING
                     */
                  if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
                      (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
                      (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
                        if (hold_tcblock == 0) {
                              SCTP_TCB_LOCK(stcb);
                              hold_tcblock = 1;
                        }
                        if (asoc->locked_on_sending) {
                              /* Locked to send out the data */
                              struct sctp_stream_queue_pending *sp;

                              sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
                              if (sp) {
                                    if ((sp->length == 0) && (sp->msg_is_complete == 0))
                                          asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
                              }
                        }
                        asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
                        if (TAILQ_EMPTY(&asoc->send_queue) &&
                            TAILQ_EMPTY(&asoc->sent_queue) &&
                            (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
                  abort_anyway:
                              if (free_cnt_applied) {
                                    atomic_add_int(&stcb->asoc.refcnt, -1);
                                    free_cnt_applied = 0;
                              }
                              sctp_abort_an_association(stcb->sctp_ep, stcb,
                                  SCTP_RESPONSE_TO_USER_REQ,
                                  NULL, SCTP_SO_LOCKED);
                              /*
                               * now relock the stcb so everything
                               * is sane
                               */
                              hold_tcblock = 0;
                              stcb = NULL;
                              goto out;
                        }
                        sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
                            asoc->primary_destination);
                        sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
                  }
            }
      }
skip_out_eof:
      if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
            some_on_control = 1;
      }
      if ((net->flight_size > net->cwnd) &&
          (sctp_cmt_on_off == 0)) {
            queue_only = 1;
      } else if (asoc->ifp_had_enobuf) {
            SCTP_STAT_INCR(sctps_ifnomemqueued);
            if (net->flight_size > (net->mtu * 2)) {
                  queue_only = 1;
            } else {
                  queue_only = 0;
            }
            asoc->ifp_had_enobuf = 0;
            un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
                ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
                sizeof(struct sctp_data_chunk)));
      } else {
            un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
                ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
                sizeof(struct sctp_data_chunk)));
            if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
                  queue_only = 1;
                  SCTP_STAT_INCR(sctps_send_burst_avoid);
            } else if (net->flight_size > net->cwnd) {
                  queue_only = 1;
                  SCTP_STAT_INCR(sctps_send_cwnd_avoid);
            } else {
                  queue_only = 0;
            }
      }
      if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
          (stcb->asoc.total_flight > 0) &&
          (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
          (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
          ) {
            /*-
             * Ok, Nagle is set on and we have data outstanding.
             * Don't send anything and let SACKs drive out the
             * data unless wen have a "full" segment to send.
             */
            if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
                  sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
            }
            SCTP_STAT_INCR(sctps_naglequeued);
            nagle_applies = 1;
      } else {
            if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
                  if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
                        sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
            }
            SCTP_STAT_INCR(sctps_naglesent);
            nagle_applies = 0;
      }
      if (queue_only_for_init) {
            if (hold_tcblock == 0) {
                  SCTP_TCB_LOCK(stcb);
                  hold_tcblock = 1;
            }
            if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
                  /* a collision took us forward? */
                  queue_only_for_init = 0;
                  queue_only = 0;
            } else {
                  sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
                  SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
                  queue_only_for_init = 0;
                  queue_only = 1;
            }
      }
      if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
            /* we can attempt to send too. */
            if (hold_tcblock == 0) {
                  /*
                   * If there is activity recv'ing sacks no need to
                   * send
                   */
                  if (SCTP_TCB_TRYLOCK(stcb)) {
                        sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
                        hold_tcblock = 1;
                  }
            } else {
                  sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
            }
      } else if ((queue_only == 0) &&
                (stcb->asoc.peers_rwnd == 0) &&
          (stcb->asoc.total_flight == 0)) {
            /* We get to have a probe outstanding */
            if (hold_tcblock == 0) {
                  hold_tcblock = 1;
                  SCTP_TCB_LOCK(stcb);
            }
            sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
      } else if (some_on_control) {
            int num_out, reason, cwnd_full, frag_point;

            /* Here we do control only */
            if (hold_tcblock == 0) {
                  hold_tcblock = 1;
                  SCTP_TCB_LOCK(stcb);
            }
            frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
            (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
                &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d",
          queue_only, stcb->asoc.peers_rwnd, un_sent,
          stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
          stcb->asoc.total_output_queue_size, error);

out:
out_unlocked:

      if (local_soresv && stcb) {
            atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
            local_soresv = 0;
      }
      if (create_lock_applied) {
            SCTP_ASOC_CREATE_UNLOCK(inp);
            create_lock_applied = 0;
      }
      if ((stcb) && hold_tcblock) {
            SCTP_TCB_UNLOCK(stcb);
      }
      if (stcb && free_cnt_applied) {
            atomic_add_int(&stcb->asoc.refcnt, -1);
      }
#ifdef INVARIANTS
      if (stcb) {
            if (mtx_owned(&stcb->tcb_mtx)) {
                  panic("Leaving with tcb mtx owned?");
            }
            if (mtx_owned(&stcb->tcb_send_mtx)) {
                  panic("Leaving with tcb send mtx owned?");
            }
      }
#endif
      if (top) {
            sctp_m_freem(top);
      }
      if (control) {
            sctp_m_freem(control);
      }
      return (error);
}


/*
 * generate an AUTHentication chunk, if required
 */
struct mbuf *
sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
    struct sctp_auth_chunk **auth_ret, uint32_t * offset,
    struct sctp_tcb *stcb, uint8_t chunk)
{
      struct mbuf *m_auth;
      struct sctp_auth_chunk *auth;
      int chunk_len;

      if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
          (stcb == NULL))
            return (m);

      /* sysctl disabled auth? */
      if (sctp_auth_disable)
            return (m);

      /* peer doesn't do auth... */
      if (!stcb->asoc.peer_supports_auth) {
            return (m);
      }
      /* does the requested chunk require auth? */
      if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
            return (m);
      }
      m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
      if (m_auth == NULL) {
            /* no mbuf's */
            return (m);
      }
      /* reserve some space if this will be the first mbuf */
      if (m == NULL)
            SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
      /* fill in the AUTH chunk details */
      auth = mtod(m_auth, struct sctp_auth_chunk *);
      bzero(auth, sizeof(*auth));
      auth->ch.chunk_type = SCTP_AUTHENTICATION;
      auth->ch.chunk_flags = 0;
      chunk_len = sizeof(*auth) +
          sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
      auth->ch.chunk_length = htons(chunk_len);
      auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
      /* key id and hmac digest will be computed and filled in upon send */

      /* save the offset where the auth was inserted into the chain */
      if (m != NULL) {
            struct mbuf *cn;

            *offset = 0;
            cn = m;
            while (cn) {
                  *offset += SCTP_BUF_LEN(cn);
                  cn = SCTP_BUF_NEXT(cn);
            }
      } else
            *offset = 0;

      /* update length and return pointer to the auth chunk */
      SCTP_BUF_LEN(m_auth) = chunk_len;
      m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
      if (auth_ret != NULL)
            *auth_ret = auth;

      return (m);
}

int
sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
{
      struct nd_prefix *pfx = NULL;
      struct nd_pfxrouter *pfxrtr = NULL;
      struct sockaddr_in6 gw6;

      if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
            return (0);

      /* get prefix entry of address */
      LIST_FOREACH(pfx, &nd_prefix, ndpr_entry) {
            if (pfx->ndpr_stateflags & NDPRF_DETACHED)
                  continue;
            if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
                &src6->sin6_addr, &pfx->ndpr_mask))
                  break;
      }
      /* no prefix entry in the prefix list */
      if (pfx == NULL) {
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
            SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
            return (0);
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
      SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);

      /* search installed gateway from prefix entry */
      for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
          pfxrtr->pfr_next) {
            memset(&gw6, 0, sizeof(struct sockaddr_in6));
            gw6.sin6_family = AF_INET6;
            gw6.sin6_len = sizeof(struct sockaddr_in6);
            memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
                sizeof(struct in6_addr));
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
            SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
            SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
            SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
            if (sctp_cmpaddr((struct sockaddr *)&gw6,
                ro->ro_rt->rt_gateway)) {
                  SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
                  return (1);
            }
      }
      SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
      return (0);
}
int
sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
{
      struct sockaddr_in *sin, *mask;
      struct ifaddr *ifa;
      struct in_addr srcnetaddr, gwnetaddr;

      if (ro == NULL || ro->ro_rt == NULL ||
          sifa->address.sa.sa_family != AF_INET) {
            return (0);
      }
      ifa = (struct ifaddr *)sifa->ifa;
      mask = (struct sockaddr_in *)(ifa->ifa_netmask);
      sin = (struct sockaddr_in *)&sifa->address.sin;
      srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
      SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);

      sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
      gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
      SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
      SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
      if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
            return (1);
      }
      return (0);
}

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