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sctp_pcb.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_pcb.c,v 1.38 2005/03/06 16:04:18 itojun Exp $       */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/netinet/sctp_pcb.c,v 1.62.2.2.2.1 2008/01/31 17:21:50 rrs Exp $");

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


struct sctp_epinfo sctppcbinfo;

/* FIX: we don't handle multiple link local scopes */
/* "scopeless" replacement IN6_ARE_ADDR_EQUAL */
int
SCTP6_ARE_ADDR_EQUAL(struct in6_addr *a, struct in6_addr *b)
{
      struct in6_addr tmp_a, tmp_b;

      /* use a copy of a and b */
      tmp_a = *a;
      tmp_b = *b;
      in6_clearscope(&tmp_a);
      in6_clearscope(&tmp_b);
      return (IN6_ARE_ADDR_EQUAL(&tmp_a, &tmp_b));
}

void
sctp_fill_pcbinfo(struct sctp_pcbinfo *spcb)
{
      /*
       * We really don't need to lock this, but I will just because it
       * does not hurt.
       */
      SCTP_INP_INFO_RLOCK();
      spcb->ep_count = sctppcbinfo.ipi_count_ep;
      spcb->asoc_count = sctppcbinfo.ipi_count_asoc;
      spcb->laddr_count = sctppcbinfo.ipi_count_laddr;
      spcb->raddr_count = sctppcbinfo.ipi_count_raddr;
      spcb->chk_count = sctppcbinfo.ipi_count_chunk;
      spcb->readq_count = sctppcbinfo.ipi_count_readq;
      spcb->stream_oque = sctppcbinfo.ipi_count_strmoq;
      spcb->free_chunks = sctppcbinfo.ipi_free_chunks;

      SCTP_INP_INFO_RUNLOCK();
}

/*
 * Addresses are added to VRF's (Virtual Router's). For BSD we
 * have only the default VRF 0. We maintain a hash list of
 * VRF's. Each VRF has its own list of sctp_ifn's. Each of
 * these has a list of addresses. When we add a new address
 * to a VRF we lookup the ifn/ifn_index, if the ifn does
 * not exist we create it and add it to the list of IFN's
 * within the VRF. Once we have the sctp_ifn, we add the
 * address to the list. So we look something like:
 *
 * hash-vrf-table
 *   vrf-> ifn-> ifn -> ifn
 *   vrf    |
 *    ...   +--ifa-> ifa -> ifa
 *   vrf
 *
 * We keep these seperate lists since the SCTP subsystem will
 * point to these from its source address selection nets structure.
 * When an address is deleted it does not happen right away on
 * the SCTP side, it gets scheduled. What we do when a
 * delete happens is immediately remove the address from
 * the master list and decrement the refcount. As our
 * addip iterator works through and frees the src address
 * selection pointing to the sctp_ifa, eventually the refcount
 * will reach 0 and we will delete it. Note that it is assumed
 * that any locking on system level ifn/ifa is done at the
 * caller of these functions and these routines will only
 * lock the SCTP structures as they add or delete things.
 *
 * Other notes on VRF concepts.
 *  - An endpoint can be in multiple VRF's
 *  - An association lives within a VRF and only one VRF.
 *  - Any incoming packet we can deduce the VRF for by
 *    looking at the mbuf/pak inbound (for BSD its VRF=0 :D)
 *  - Any downward send call or connect call must supply the
 *    VRF via ancillary data or via some sort of set default
 *    VRF socket option call (again for BSD no brainer since
 *    the VRF is always 0).
 *  - An endpoint may add multiple VRF's to it.
 *  - Listening sockets can accept associations in any
 *    of the VRF's they are in but the assoc will end up
 *    in only one VRF (gotten from the packet or connect/send).
 *
 */

struct sctp_vrf *
sctp_allocate_vrf(int vrf_id)
{
      struct sctp_vrf *vrf = NULL;
      struct sctp_vrflist *bucket;

      /* First allocate the VRF structure */
      vrf = sctp_find_vrf(vrf_id);
      if (vrf) {
            /* Already allocated */
            return (vrf);
      }
      SCTP_MALLOC(vrf, struct sctp_vrf *, sizeof(struct sctp_vrf),
          SCTP_M_VRF);
      if (vrf == NULL) {
            /* No memory */
#ifdef INVARIANTS
            panic("No memory for VRF:%d", vrf_id);
#endif
            return (NULL);
      }
      /* setup the VRF */
      memset(vrf, 0, sizeof(struct sctp_vrf));
      vrf->vrf_id = vrf_id;
      LIST_INIT(&vrf->ifnlist);
      vrf->total_ifa_count = 0;
      vrf->refcount = 0;
      /* now also setup table ids */
      SCTP_INIT_VRF_TABLEID(vrf);
      /* Init the HASH of addresses */
      vrf->vrf_addr_hash = SCTP_HASH_INIT(SCTP_VRF_ADDR_HASH_SIZE,
          &vrf->vrf_addr_hashmark);
      if (vrf->vrf_addr_hash == NULL) {
            /* No memory */
#ifdef INVARIANTS
            panic("No memory for VRF:%d", vrf_id);
#endif
            SCTP_FREE(vrf, SCTP_M_VRF);
            return (NULL);
      }
      /* Add it to the hash table */
      bucket = &sctppcbinfo.sctp_vrfhash[(vrf_id & sctppcbinfo.hashvrfmark)];
      LIST_INSERT_HEAD(bucket, vrf, next_vrf);
      atomic_add_int(&sctppcbinfo.ipi_count_vrfs, 1);
      return (vrf);
}


struct sctp_ifn *
sctp_find_ifn(void *ifn, uint32_t ifn_index)
{
      struct sctp_ifn *sctp_ifnp;
      struct sctp_ifnlist *hash_ifn_head;

      /*
       * We assume the lock is held for the addresses if thats wrong
       * problems could occur :-)
       */
      hash_ifn_head = &sctppcbinfo.vrf_ifn_hash[(ifn_index & sctppcbinfo.vrf_ifn_hashmark)];
      LIST_FOREACH(sctp_ifnp, hash_ifn_head, next_bucket) {
            if (sctp_ifnp->ifn_index == ifn_index) {
                  return (sctp_ifnp);
            }
            if (sctp_ifnp->ifn_p && ifn && (sctp_ifnp->ifn_p == ifn)) {
                  return (sctp_ifnp);
            }
      }
      return (NULL);
}



struct sctp_vrf *
sctp_find_vrf(uint32_t vrf_id)
{
      struct sctp_vrflist *bucket;
      struct sctp_vrf *liste;

      bucket = &sctppcbinfo.sctp_vrfhash[(vrf_id & sctppcbinfo.hashvrfmark)];
      LIST_FOREACH(liste, bucket, next_vrf) {
            if (vrf_id == liste->vrf_id) {
                  return (liste);
            }
      }
      return (NULL);
}

void
sctp_free_vrf(struct sctp_vrf *vrf)
{
      int ret;

      ret = atomic_fetchadd_int(&vrf->refcount, -1);
      if (ret == 1) {
            /* We zero'd the count */
            LIST_REMOVE(vrf, next_vrf);
            SCTP_FREE(vrf, SCTP_M_VRF);
            atomic_subtract_int(&sctppcbinfo.ipi_count_vrfs, 1);
      }
}

void
sctp_free_ifn(struct sctp_ifn *sctp_ifnp)
{
      int ret;

      ret = atomic_fetchadd_int(&sctp_ifnp->refcount, -1);
      if (ret == 1) {
            /* We zero'd the count */
            if (sctp_ifnp->vrf) {
                  sctp_free_vrf(sctp_ifnp->vrf);
            }
            SCTP_FREE(sctp_ifnp, SCTP_M_IFN);
            atomic_subtract_int(&sctppcbinfo.ipi_count_ifns, 1);
      }
}

void
sctp_update_ifn_mtu(uint32_t ifn_index, uint32_t mtu)
{
      struct sctp_ifn *sctp_ifnp;

      sctp_ifnp = sctp_find_ifn((void *)NULL, ifn_index);
      if (sctp_ifnp != NULL) {
            sctp_ifnp->ifn_mtu = mtu;
      }
}


void
sctp_free_ifa(struct sctp_ifa *sctp_ifap)
{
      int ret;

      ret = atomic_fetchadd_int(&sctp_ifap->refcount, -1);
      if (ret == 1) {
            /* We zero'd the count */
            if (sctp_ifap->ifn_p) {
                  sctp_free_ifn(sctp_ifap->ifn_p);
            }
            SCTP_FREE(sctp_ifap, SCTP_M_IFA);
            atomic_subtract_int(&sctppcbinfo.ipi_count_ifas, 1);
      }
}

static void
sctp_delete_ifn(struct sctp_ifn *sctp_ifnp, int hold_addr_lock)
{
      struct sctp_ifn *found;

      found = sctp_find_ifn(sctp_ifnp->ifn_p, sctp_ifnp->ifn_index);
      if (found == NULL) {
            /* Not in the list.. sorry */
            return;
      }
      if (hold_addr_lock == 0)
            SCTP_IPI_ADDR_WLOCK();
      LIST_REMOVE(sctp_ifnp, next_bucket);
      LIST_REMOVE(sctp_ifnp, next_ifn);
      SCTP_DEREGISTER_INTERFACE(sctp_ifnp->ifn_index,
          sctp_ifnp->registered_af);
      if (hold_addr_lock == 0)
            SCTP_IPI_ADDR_WUNLOCK();
      /* Take away the reference, and possibly free it */
      sctp_free_ifn(sctp_ifnp);
}

void
sctp_mark_ifa_addr_down(uint32_t vrf_id, struct sockaddr *addr,
    const char *if_name, uint32_t ifn_index)
{
      struct sctp_vrf *vrf;
      struct sctp_ifa *sctp_ifap = NULL;

      SCTP_IPI_ADDR_RLOCK();
      vrf = sctp_find_vrf(vrf_id);
      if (vrf == NULL) {
            SCTPDBG(SCTP_DEBUG_PCB4, "Can't find vrf_id 0x%x\n", vrf_id);
            goto out;

      }
      sctp_ifap = sctp_find_ifa_by_addr(addr, vrf->vrf_id, SCTP_ADDR_LOCKED);
      if (sctp_ifap == NULL) {
            SCTPDBG(SCTP_DEBUG_PCB4, "Can't find sctp_ifap for address\n");
            goto out;
      }
      if (sctp_ifap->ifn_p == NULL) {
            SCTPDBG(SCTP_DEBUG_PCB4, "IFA has no IFN - can't mark unuseable\n");
            goto out;
      }
      if (if_name) {
            int len1, len2;

            len1 = strlen(if_name);
            len2 = strlen(sctp_ifap->ifn_p->ifn_name);
            if (len1 != len2) {
                  SCTPDBG(SCTP_DEBUG_PCB4, "IFN of ifa names different lenght %d vs %d - ignored\n",
                      len1, len2);
                  goto out;
            }
            if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, len1) != 0) {
                  SCTPDBG(SCTP_DEBUG_PCB4, "IFN %s of IFA not the same as %s\n",
                      sctp_ifap->ifn_p->ifn_name,
                      if_name);
                  goto out;
            }
      } else {
            if (sctp_ifap->ifn_p->ifn_index != ifn_index) {
                  SCTPDBG(SCTP_DEBUG_PCB4, "IFA owned by ifn_index:%d down command for ifn_index:%d - ignored\n",
                      sctp_ifap->ifn_p->ifn_index, ifn_index);
                  goto out;
            }
      }

      sctp_ifap->localifa_flags &= (~SCTP_ADDR_VALID);
      sctp_ifap->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
out:
      SCTP_IPI_ADDR_RUNLOCK();
}

void
sctp_mark_ifa_addr_up(uint32_t vrf_id, struct sockaddr *addr,
    const char *if_name, uint32_t ifn_index)
{
      struct sctp_vrf *vrf;
      struct sctp_ifa *sctp_ifap = NULL;

      SCTP_IPI_ADDR_RLOCK();
      vrf = sctp_find_vrf(vrf_id);
      if (vrf == NULL) {
            SCTPDBG(SCTP_DEBUG_PCB4, "Can't find vrf_id 0x%x\n", vrf_id);
            goto out;

      }
      sctp_ifap = sctp_find_ifa_by_addr(addr, vrf->vrf_id, SCTP_ADDR_LOCKED);
      if (sctp_ifap == NULL) {
            SCTPDBG(SCTP_DEBUG_PCB4, "Can't find sctp_ifap for address\n");
            goto out;
      }
      if (sctp_ifap->ifn_p == NULL) {
            SCTPDBG(SCTP_DEBUG_PCB4, "IFA has no IFN - can't mark unuseable\n");
            goto out;
      }
      if (if_name) {
            int len1, len2;

            len1 = strlen(if_name);
            len2 = strlen(sctp_ifap->ifn_p->ifn_name);
            if (len1 != len2) {
                  SCTPDBG(SCTP_DEBUG_PCB4, "IFN of ifa names different lenght %d vs %d - ignored\n",
                      len1, len2);
                  goto out;
            }
            if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, len1) != 0) {
                  SCTPDBG(SCTP_DEBUG_PCB4, "IFN %s of IFA not the same as %s\n",
                      sctp_ifap->ifn_p->ifn_name,
                      if_name);
                  goto out;
            }
      } else {
            if (sctp_ifap->ifn_p->ifn_index != ifn_index) {
                  SCTPDBG(SCTP_DEBUG_PCB4, "IFA owned by ifn_index:%d down command for ifn_index:%d - ignored\n",
                      sctp_ifap->ifn_p->ifn_index, ifn_index);
                  goto out;
            }
      }

      sctp_ifap->localifa_flags &= (~SCTP_ADDR_IFA_UNUSEABLE);
      sctp_ifap->localifa_flags |= SCTP_ADDR_VALID;
out:
      SCTP_IPI_ADDR_RUNLOCK();
}

/*-
 * Add an ifa to an ifn.
 * Register the interface as necessary.
 * NOTE: ADDR write lock MUST be held.
 */
static void
sctp_add_ifa_to_ifn(struct sctp_ifn *sctp_ifnp, struct sctp_ifa *sctp_ifap)
{
      int ifa_af;

      LIST_INSERT_HEAD(&sctp_ifnp->ifalist, sctp_ifap, next_ifa);
      sctp_ifap->ifn_p = sctp_ifnp;
      atomic_add_int(&sctp_ifap->ifn_p->refcount, 1);
      /* update address counts */
      sctp_ifnp->ifa_count++;
      ifa_af = sctp_ifap->address.sa.sa_family;
      if (ifa_af == AF_INET)
            sctp_ifnp->num_v4++;
      else
            sctp_ifnp->num_v6++;
      if (sctp_ifnp->ifa_count == 1) {
            /* register the new interface */
            SCTP_REGISTER_INTERFACE(sctp_ifnp->ifn_index, ifa_af);
            sctp_ifnp->registered_af = ifa_af;
      }
}

/*-
 * Remove an ifa from its ifn.
 * If no more addresses exist, remove the ifn too. Otherwise, re-register
 * the interface based on the remaining address families left.
 * NOTE: ADDR write lock MUST be held.
 */
static void
sctp_remove_ifa_from_ifn(struct sctp_ifa *sctp_ifap)
{
      uint32_t ifn_index;

      LIST_REMOVE(sctp_ifap, next_ifa);
      if (sctp_ifap->ifn_p) {
            /* update address counts */
            sctp_ifap->ifn_p->ifa_count--;
            if (sctp_ifap->address.sa.sa_family == AF_INET6)
                  sctp_ifap->ifn_p->num_v6--;
            else if (sctp_ifap->address.sa.sa_family == AF_INET)
                  sctp_ifap->ifn_p->num_v4--;

            ifn_index = sctp_ifap->ifn_p->ifn_index;
            if (SCTP_LIST_EMPTY(&sctp_ifap->ifn_p->ifalist)) {
                  /* remove the ifn, possibly freeing it */
                  sctp_delete_ifn(sctp_ifap->ifn_p, SCTP_ADDR_LOCKED);
            } else {
                  /* re-register address family type, if needed */
                  if ((sctp_ifap->ifn_p->num_v6 == 0) &&
                      (sctp_ifap->ifn_p->registered_af == AF_INET6)) {
                        SCTP_DEREGISTER_INTERFACE(ifn_index, AF_INET6);
                        SCTP_REGISTER_INTERFACE(ifn_index, AF_INET);
                        sctp_ifap->ifn_p->registered_af = AF_INET;
                  } else if ((sctp_ifap->ifn_p->num_v4 == 0) &&
                      (sctp_ifap->ifn_p->registered_af == AF_INET)) {
                        SCTP_DEREGISTER_INTERFACE(ifn_index, AF_INET);
                        SCTP_REGISTER_INTERFACE(ifn_index, AF_INET6);
                        sctp_ifap->ifn_p->registered_af = AF_INET6;
                  }
                  /* free the ifn refcount */
                  sctp_free_ifn(sctp_ifap->ifn_p);
            }
            sctp_ifap->ifn_p = NULL;
      }
}

struct sctp_ifa *
sctp_add_addr_to_vrf(uint32_t vrf_id, void *ifn, uint32_t ifn_index,
    uint32_t ifn_type, const char *if_name, void *ifa,
    struct sockaddr *addr, uint32_t ifa_flags,
    int dynamic_add)
{
      struct sctp_vrf *vrf;
      struct sctp_ifn *sctp_ifnp = NULL;
      struct sctp_ifa *sctp_ifap = NULL;
      struct sctp_ifalist *hash_addr_head;
      struct sctp_ifnlist *hash_ifn_head;
      uint32_t hash_of_addr;
      int new_ifn_af = 0;

#ifdef SCTP_DEBUG
      SCTPDBG(SCTP_DEBUG_PCB4, "vrf_id 0x%x: adding address: ", vrf_id);
      SCTPDBG_ADDR(SCTP_DEBUG_PCB4, addr);
#endif
      SCTP_IPI_ADDR_WLOCK();
      sctp_ifnp = sctp_find_ifn(ifn, ifn_index);
      if (sctp_ifnp) {
            vrf = sctp_ifnp->vrf;
      } else {
            vrf = sctp_find_vrf(vrf_id);
            if (vrf == NULL) {
                  vrf = sctp_allocate_vrf(vrf_id);
                  if (vrf == NULL) {
                        SCTP_IPI_ADDR_WUNLOCK();
                        return (NULL);
                  }
            }
      }
      if (sctp_ifnp == NULL) {
            /*
             * build one and add it, can't hold lock until after malloc
             * done though.
             */
            SCTP_IPI_ADDR_WUNLOCK();
            SCTP_MALLOC(sctp_ifnp, struct sctp_ifn *,
                sizeof(struct sctp_ifn), SCTP_M_IFN);
            if (sctp_ifnp == NULL) {
#ifdef INVARIANTS
                  panic("No memory for IFN:%u", sctp_ifnp->ifn_index);
#endif
                  return (NULL);
            }
            memset(sctp_ifnp, 0, sizeof(struct sctp_ifn));
            sctp_ifnp->ifn_index = ifn_index;
            sctp_ifnp->ifn_p = ifn;
            sctp_ifnp->ifn_type = ifn_type;
            sctp_ifnp->refcount = 0;
            sctp_ifnp->vrf = vrf;
            atomic_add_int(&vrf->refcount, 1);
            sctp_ifnp->ifn_mtu = SCTP_GATHER_MTU_FROM_IFN_INFO(ifn, ifn_index, addr->sa_family);
            if (if_name != NULL) {
                  memcpy(sctp_ifnp->ifn_name, if_name, SCTP_IFNAMSIZ);
            } else {
                  memcpy(sctp_ifnp->ifn_name, "unknown", min(7, SCTP_IFNAMSIZ));
            }
            hash_ifn_head = &sctppcbinfo.vrf_ifn_hash[(ifn_index & sctppcbinfo.vrf_ifn_hashmark)];
            LIST_INIT(&sctp_ifnp->ifalist);
            SCTP_IPI_ADDR_WLOCK();
            LIST_INSERT_HEAD(hash_ifn_head, sctp_ifnp, next_bucket);
            LIST_INSERT_HEAD(&vrf->ifnlist, sctp_ifnp, next_ifn);
            atomic_add_int(&sctppcbinfo.ipi_count_ifns, 1);
            new_ifn_af = 1;
      }
      sctp_ifap = sctp_find_ifa_by_addr(addr, vrf->vrf_id, SCTP_ADDR_LOCKED);
      if (sctp_ifap) {
            /* Hmm, it already exists? */
            if ((sctp_ifap->ifn_p) &&
                (sctp_ifap->ifn_p->ifn_index == ifn_index)) {
                  SCTPDBG(SCTP_DEBUG_PCB4, "Using existing ifn %s (0x%x) for ifa %p\n",
                      sctp_ifap->ifn_p->ifn_name, ifn_index,
                      sctp_ifap);
                  if (new_ifn_af) {
                        /* Remove the created one that we don't want */
                        sctp_delete_ifn(sctp_ifnp, SCTP_ADDR_LOCKED);
                  }
                  if (sctp_ifap->localifa_flags & SCTP_BEING_DELETED) {
                        /* easy to solve, just switch back to active */
                        SCTPDBG(SCTP_DEBUG_PCB4, "Clearing deleted ifa flag\n");
                        sctp_ifap->localifa_flags = SCTP_ADDR_VALID;
                        sctp_ifap->ifn_p = sctp_ifnp;
                        atomic_add_int(&sctp_ifap->ifn_p->refcount, 1);
                  }
      exit_stage_left:
                  SCTP_IPI_ADDR_WUNLOCK();
                  return (sctp_ifap);
            } else {
                  if (sctp_ifap->ifn_p) {
                        /*
                         * The last IFN gets the address, removee
                         * the old one
                         */
                        SCTPDBG(SCTP_DEBUG_PCB4, "Moving ifa %p from %s (0x%x) to %s (0x%x)\n",
                            sctp_ifap, sctp_ifap->ifn_p->ifn_name,
                            sctp_ifap->ifn_p->ifn_index, if_name,
                            ifn_index);
                        /* remove the address from the old ifn */
                        sctp_remove_ifa_from_ifn(sctp_ifap);
                        /* move the address over to the new ifn */
                        sctp_add_ifa_to_ifn(sctp_ifnp, sctp_ifap);
                        goto exit_stage_left;
                  } else {
                        /* repair ifnp which was NULL ? */
                        sctp_ifap->localifa_flags = SCTP_ADDR_VALID;
                        SCTPDBG(SCTP_DEBUG_PCB4, "Repairing ifn %p for ifa %p\n",
                            sctp_ifnp, sctp_ifap);
                        sctp_add_ifa_to_ifn(sctp_ifnp, sctp_ifap);
                  }
                  goto exit_stage_left;
            }
      }
      SCTP_IPI_ADDR_WUNLOCK();
      SCTP_MALLOC(sctp_ifap, struct sctp_ifa *, sizeof(struct sctp_ifa), SCTP_M_IFA);
      if (sctp_ifap == NULL) {
#ifdef INVARIANTS
            panic("No memory for IFA");
#endif
            return (NULL);
      }
      memset(sctp_ifap, 0, sizeof(struct sctp_ifa));
      sctp_ifap->ifn_p = sctp_ifnp;
      atomic_add_int(&sctp_ifnp->refcount, 1);
      sctp_ifap->vrf_id = vrf_id;
      sctp_ifap->ifa = ifa;
      memcpy(&sctp_ifap->address, addr, addr->sa_len);
      sctp_ifap->localifa_flags = SCTP_ADDR_VALID | SCTP_ADDR_DEFER_USE;
      sctp_ifap->flags = ifa_flags;
      /* Set scope */
      if (sctp_ifap->address.sa.sa_family == AF_INET) {
            struct sockaddr_in *sin;

            sin = (struct sockaddr_in *)&sctp_ifap->address.sin;
            if (SCTP_IFN_IS_IFT_LOOP(sctp_ifap->ifn_p) ||
                (IN4_ISLOOPBACK_ADDRESS(&sin->sin_addr))) {
                  sctp_ifap->src_is_loop = 1;
            }
            if ((IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
                  sctp_ifap->src_is_priv = 1;
            }
            sctp_ifnp->num_v4++;
            if (new_ifn_af)
                  new_ifn_af = AF_INET;
      } else if (sctp_ifap->address.sa.sa_family == AF_INET6) {
            /* ok to use deprecated addresses? */
            struct sockaddr_in6 *sin6;

            sin6 = (struct sockaddr_in6 *)&sctp_ifap->address.sin6;
            if (SCTP_IFN_IS_IFT_LOOP(sctp_ifap->ifn_p) ||
                (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))) {
                  sctp_ifap->src_is_loop = 1;
            }
            if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                  sctp_ifap->src_is_priv = 1;
            }
            sctp_ifnp->num_v6++;
            if (new_ifn_af)
                  new_ifn_af = AF_INET6;
      } else {
            new_ifn_af = 0;
      }
      hash_of_addr = sctp_get_ifa_hash_val(&sctp_ifap->address.sa);

      if ((sctp_ifap->src_is_priv == 0) &&
          (sctp_ifap->src_is_loop == 0)) {
            sctp_ifap->src_is_glob = 1;
      }
      SCTP_IPI_ADDR_WLOCK();
      hash_addr_head = &vrf->vrf_addr_hash[(hash_of_addr & vrf->vrf_addr_hashmark)];
      LIST_INSERT_HEAD(hash_addr_head, sctp_ifap, next_bucket);
      sctp_ifap->refcount = 1;
      LIST_INSERT_HEAD(&sctp_ifnp->ifalist, sctp_ifap, next_ifa);
      sctp_ifnp->ifa_count++;
      vrf->total_ifa_count++;
      atomic_add_int(&sctppcbinfo.ipi_count_ifas, 1);
      if (new_ifn_af) {
            SCTP_REGISTER_INTERFACE(ifn_index, new_ifn_af);
            sctp_ifnp->registered_af = new_ifn_af;
      }
      SCTP_IPI_ADDR_WUNLOCK();
      if (dynamic_add) {
            /*
             * Bump up the refcount so that when the timer completes it
             * will drop back down.
             */
            struct sctp_laddr *wi;

            atomic_add_int(&sctp_ifap->refcount, 1);
            wi = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_laddr, struct sctp_laddr);
            if (wi == NULL) {
                  /*
                   * Gak, what can we do? We have lost an address
                   * change can you say HOSED?
                   */
                  SCTPDBG(SCTP_DEBUG_PCB4, "Lost an address change?\n");
                  /* Opps, must decrement the count */
                  sctp_del_addr_from_vrf(vrf_id, addr, ifn_index,
                      if_name);
                  return (NULL);
            }
            SCTP_INCR_LADDR_COUNT();
            bzero(wi, sizeof(*wi));
            (void)SCTP_GETTIME_TIMEVAL(&wi->start_time);
            wi->ifa = sctp_ifap;
            wi->action = SCTP_ADD_IP_ADDRESS;
            SCTP_IPI_ITERATOR_WQ_LOCK();
            /*
             * Should this really be a tailq? As it is we will process
             * the newest first :-0
             */
            LIST_INSERT_HEAD(&sctppcbinfo.addr_wq, wi, sctp_nxt_addr);
            SCTP_IPI_ITERATOR_WQ_UNLOCK();
            sctp_timer_start(SCTP_TIMER_TYPE_ADDR_WQ,
                (struct sctp_inpcb *)NULL,
                (struct sctp_tcb *)NULL,
                (struct sctp_nets *)NULL);
      } else {
            /* it's ready for use */
            sctp_ifap->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
      }
      return (sctp_ifap);
}

void
sctp_del_addr_from_vrf(uint32_t vrf_id, struct sockaddr *addr,
    uint32_t ifn_index, const char *if_name)
{
      struct sctp_vrf *vrf;
      struct sctp_ifa *sctp_ifap = NULL;

      SCTP_IPI_ADDR_WLOCK();
      vrf = sctp_find_vrf(vrf_id);
      if (vrf == NULL) {
            SCTPDBG(SCTP_DEBUG_PCB4, "Can't find vrf_id 0x%x\n", vrf_id);
            goto out_now;
      }
#ifdef SCTP_DEBUG
      SCTPDBG(SCTP_DEBUG_PCB4, "vrf_id 0x%x: deleting address:", vrf_id);
      SCTPDBG_ADDR(SCTP_DEBUG_PCB4, addr);
#endif
      sctp_ifap = sctp_find_ifa_by_addr(addr, vrf->vrf_id, SCTP_ADDR_LOCKED);
      if (sctp_ifap) {
            /* Validate the delete */
            if (sctp_ifap->ifn_p) {
                  int valid = 0;

                  /*-
                   * The name has priority over the ifn_index
                   * if its given. We do this especially for
                   * panda who might recycle indexes fast.
                   */
                  if (if_name) {
                        int len1, len2;

                        len1 = min(SCTP_IFNAMSIZ, strlen(if_name));
                        len2 = min(SCTP_IFNAMSIZ, strlen(sctp_ifap->ifn_p->ifn_name));
                        if (len1 && len2 && (len1 == len2)) {
                              /* we can compare them */
                              if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, len1) == 0) {
                                    /*
                                     * They match its a correct
                                     * delete
                                     */
                                    valid = 1;
                              }
                        }
                  }
                  if (!valid) {
                        /* last ditch check ifn_index */
                        if (ifn_index == sctp_ifap->ifn_p->ifn_index) {
                              valid = 1;
                        }
                  }
                  if (!valid) {
                        SCTPDBG(SCTP_DEBUG_PCB4, "ifn:%d ifname:%s does not match addresses\n",
                            ifn_index, ((if_name == NULL) ? "NULL" : if_name));
                        SCTPDBG(SCTP_DEBUG_PCB4, "ifn:%d ifname:%s - ignoring delete\n",
                            sctp_ifap->ifn_p->ifn_index, sctp_ifap->ifn_p->ifn_name);
                        SCTP_IPI_ADDR_WUNLOCK();
                        return;
                  }
            }
            SCTPDBG(SCTP_DEBUG_PCB4, "Deleting ifa %p\n", sctp_ifap);
            sctp_ifap->localifa_flags &= SCTP_ADDR_VALID;
            sctp_ifap->localifa_flags |= SCTP_BEING_DELETED;
            vrf->total_ifa_count--;
            LIST_REMOVE(sctp_ifap, next_bucket);
            sctp_remove_ifa_from_ifn(sctp_ifap);
      }
#ifdef SCTP_DEBUG
      else {
            SCTPDBG(SCTP_DEBUG_PCB4, "Del Addr-ifn:%d Could not find address:",
                ifn_index);
            SCTPDBG_ADDR(SCTP_DEBUG_PCB1, addr);
      }
#endif

out_now:
      SCTP_IPI_ADDR_WUNLOCK();
      if (sctp_ifap) {
            struct sctp_laddr *wi;

            wi = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_laddr, struct sctp_laddr);
            if (wi == NULL) {
                  /*
                   * Gak, what can we do? We have lost an address
                   * change can you say HOSED?
                   */
                  SCTPDBG(SCTP_DEBUG_PCB4, "Lost an address change?\n");

                  /* Oops, must decrement the count */
                  sctp_free_ifa(sctp_ifap);
                  return;
            }
            SCTP_INCR_LADDR_COUNT();
            bzero(wi, sizeof(*wi));
            (void)SCTP_GETTIME_TIMEVAL(&wi->start_time);
            wi->ifa = sctp_ifap;
            wi->action = SCTP_DEL_IP_ADDRESS;
            SCTP_IPI_ITERATOR_WQ_LOCK();
            /*
             * Should this really be a tailq? As it is we will process
             * the newest first :-0
             */
            LIST_INSERT_HEAD(&sctppcbinfo.addr_wq, wi, sctp_nxt_addr);
            SCTP_IPI_ITERATOR_WQ_UNLOCK();

            sctp_timer_start(SCTP_TIMER_TYPE_ADDR_WQ,
                (struct sctp_inpcb *)NULL,
                (struct sctp_tcb *)NULL,
                (struct sctp_nets *)NULL);
      }
      return;
}


static struct sctp_tcb *
sctp_tcb_special_locate(struct sctp_inpcb **inp_p, struct sockaddr *from,
    struct sockaddr *to, struct sctp_nets **netp, uint32_t vrf_id)
{
      /**** ASSUMES THE CALLER holds the INP_INFO_RLOCK */
      /*
       * If we support the TCP model, then we must now dig through to see
       * if we can find our endpoint in the list of tcp ep's.
       */
      uint16_t lport, rport;
      struct sctppcbhead *ephead;
      struct sctp_inpcb *inp;
      struct sctp_laddr *laddr;
      struct sctp_tcb *stcb;
      struct sctp_nets *net;

      if ((to == NULL) || (from == NULL)) {
            return (NULL);
      }
      if (to->sa_family == AF_INET && from->sa_family == AF_INET) {
            lport = ((struct sockaddr_in *)to)->sin_port;
            rport = ((struct sockaddr_in *)from)->sin_port;
      } else if (to->sa_family == AF_INET6 && from->sa_family == AF_INET6) {
            lport = ((struct sockaddr_in6 *)to)->sin6_port;
            rport = ((struct sockaddr_in6 *)from)->sin6_port;
      } else {
            return NULL;
      }
      ephead = &sctppcbinfo.sctp_tcpephash[SCTP_PCBHASH_ALLADDR(
          (lport + rport), sctppcbinfo.hashtcpmark)];
      /*
       * Ok now for each of the guys in this bucket we must look and see:
       * - Does the remote port match. - Does there single association's
       * addresses match this address (to). If so we update p_ep to point
       * to this ep and return the tcb from it.
       */
      LIST_FOREACH(inp, ephead, sctp_hash) {
            SCTP_INP_RLOCK(inp);
            if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            if (lport != inp->sctp_lport) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            if (inp->def_vrf_id != vrf_id) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            /* check to see if the ep has one of the addresses */
            if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
                  /* We are NOT bound all, so look further */
                  int match = 0;

                  LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {

                        if (laddr->ifa == NULL) {
                              SCTPDBG(SCTP_DEBUG_PCB1, "%s: NULL ifa\n", __FUNCTION__);
                              continue;
                        }
                        if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
                              SCTPDBG(SCTP_DEBUG_PCB1, "ifa being deleted\n");
                              continue;
                        }
                        if (laddr->ifa->address.sa.sa_family ==
                            to->sa_family) {
                              /* see if it matches */
                              struct sockaddr_in *intf_addr, *sin;

                              intf_addr = &laddr->ifa->address.sin;
                              sin = (struct sockaddr_in *)to;
                              if (from->sa_family == AF_INET) {
                                    if (sin->sin_addr.s_addr ==
                                        intf_addr->sin_addr.s_addr) {
                                          match = 1;
                                          break;
                                    }
                              } else {
                                    struct sockaddr_in6 *intf_addr6;
                                    struct sockaddr_in6 *sin6;

                                    sin6 = (struct sockaddr_in6 *)
                                        to;
                                    intf_addr6 = &laddr->ifa->address.sin6;

                                    if (SCTP6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
                                        &intf_addr6->sin6_addr)) {
                                          match = 1;
                                          break;
                                    }
                              }
                        }
                  }
                  if (match == 0) {
                        /* This endpoint does not have this address */
                        SCTP_INP_RUNLOCK(inp);
                        continue;
                  }
            }
            /*
             * Ok if we hit here the ep has the address, does it hold
             * the tcb?
             */

            stcb = LIST_FIRST(&inp->sctp_asoc_list);
            if (stcb == NULL) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            SCTP_TCB_LOCK(stcb);
            if (stcb->rport != rport) {
                  /* remote port does not match. */
                  SCTP_TCB_UNLOCK(stcb);
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                  SCTP_TCB_UNLOCK(stcb);
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            /* Does this TCB have a matching address? */
            TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {

                  if (net->ro._l_addr.sa.sa_family != from->sa_family) {
                        /* not the same family, can't be a match */
                        continue;
                  }
                  if (from->sa_family == AF_INET) {
                        struct sockaddr_in *sin, *rsin;

                        sin = (struct sockaddr_in *)&net->ro._l_addr;
                        rsin = (struct sockaddr_in *)from;
                        if (sin->sin_addr.s_addr ==
                            rsin->sin_addr.s_addr) {
                              /* found it */
                              if (netp != NULL) {
                                    *netp = net;
                              }
                              /* Update the endpoint pointer */
                              *inp_p = inp;
                              SCTP_INP_RUNLOCK(inp);
                              return (stcb);
                        }
                  } else {
                        struct sockaddr_in6 *sin6, *rsin6;

                        sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
                        rsin6 = (struct sockaddr_in6 *)from;
                        if (SCTP6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
                            &rsin6->sin6_addr)) {
                              /* found it */
                              if (netp != NULL) {
                                    *netp = net;
                              }
                              /* Update the endpoint pointer */
                              *inp_p = inp;
                              SCTP_INP_RUNLOCK(inp);
                              return (stcb);
                        }
                  }
            }
            SCTP_TCB_UNLOCK(stcb);
            SCTP_INP_RUNLOCK(inp);
      }
      return (NULL);
}

/*
 * rules for use
 *
 * 1) If I return a NULL you must decrement any INP ref cnt. 2) If I find an
 * stcb, both will be locked (locked_tcb and stcb) but decrement will be done
 * (if locked == NULL). 3) Decrement happens on return ONLY if locked ==
 * NULL.
 */

struct sctp_tcb *
sctp_findassociation_ep_addr(struct sctp_inpcb **inp_p, struct sockaddr *remote,
    struct sctp_nets **netp, struct sockaddr *local, struct sctp_tcb *locked_tcb)
{
      struct sctpasochead *head;
      struct sctp_inpcb *inp;
      struct sctp_tcb *stcb = NULL;
      struct sctp_nets *net;
      uint16_t rport;

      inp = *inp_p;
      if (remote->sa_family == AF_INET) {
            rport = (((struct sockaddr_in *)remote)->sin_port);
      } else if (remote->sa_family == AF_INET6) {
            rport = (((struct sockaddr_in6 *)remote)->sin6_port);
      } else {
            return (NULL);
      }
      if (locked_tcb) {
            /*
             * UN-lock so we can do proper locking here this occurs when
             * called from load_addresses_from_init.
             */
            atomic_add_int(&locked_tcb->asoc.refcnt, 1);
            SCTP_TCB_UNLOCK(locked_tcb);
      }
      SCTP_INP_INFO_RLOCK();
      if (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
            /*-
             * Now either this guy is our listener or it's the
             * connector. If it is the one that issued the connect, then
             * it's only chance is to be the first TCB in the list. If
             * it is the acceptor, then do the special_lookup to hash
             * and find the real inp.
             */
            if ((inp->sctp_socket) && (inp->sctp_socket->so_qlimit)) {
                  /* to is peer addr, from is my addr */
                  stcb = sctp_tcb_special_locate(inp_p, remote, local,
                      netp, inp->def_vrf_id);
                  if ((stcb != NULL) && (locked_tcb == NULL)) {
                        /* we have a locked tcb, lower refcount */
                        SCTP_INP_DECR_REF(inp);
                  }
                  if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
                        SCTP_INP_RLOCK(locked_tcb->sctp_ep);
                        SCTP_TCB_LOCK(locked_tcb);
                        atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
                        SCTP_INP_RUNLOCK(locked_tcb->sctp_ep);
                  }
                  SCTP_INP_INFO_RUNLOCK();
                  return (stcb);
            } else {
                  SCTP_INP_WLOCK(inp);
                  if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                        goto null_return;
                  }
                  stcb = LIST_FIRST(&inp->sctp_asoc_list);
                  if (stcb == NULL) {
                        goto null_return;
                  }
                  SCTP_TCB_LOCK(stcb);

                  if (stcb->rport != rport) {
                        /* remote port does not match. */
                        SCTP_TCB_UNLOCK(stcb);
                        goto null_return;
                  }
                  if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                        SCTP_TCB_UNLOCK(stcb);
                        goto null_return;
                  }
                  /* now look at the list of remote addresses */
                  TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
#ifdef INVARIANTS
                        if (net == (TAILQ_NEXT(net, sctp_next))) {
                              panic("Corrupt net list");
                        }
#endif
                        if (net->ro._l_addr.sa.sa_family !=
                            remote->sa_family) {
                              /* not the same family */
                              continue;
                        }
                        if (remote->sa_family == AF_INET) {
                              struct sockaddr_in *sin, *rsin;

                              sin = (struct sockaddr_in *)
                                  &net->ro._l_addr;
                              rsin = (struct sockaddr_in *)remote;
                              if (sin->sin_addr.s_addr ==
                                  rsin->sin_addr.s_addr) {
                                    /* found it */
                                    if (netp != NULL) {
                                          *netp = net;
                                    }
                                    if (locked_tcb == NULL) {
                                          SCTP_INP_DECR_REF(inp);
                                    } else if (locked_tcb != stcb) {
                                          SCTP_TCB_LOCK(locked_tcb);
                                    }
                                    if (locked_tcb) {
                                          atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
                                    }
                                    SCTP_INP_WUNLOCK(inp);
                                    SCTP_INP_INFO_RUNLOCK();
                                    return (stcb);
                              }
                        } else if (remote->sa_family == AF_INET6) {
                              struct sockaddr_in6 *sin6, *rsin6;

                              sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
                              rsin6 = (struct sockaddr_in6 *)remote;
                              if (SCTP6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
                                  &rsin6->sin6_addr)) {
                                    /* found it */
                                    if (netp != NULL) {
                                          *netp = net;
                                    }
                                    if (locked_tcb == NULL) {
                                          SCTP_INP_DECR_REF(inp);
                                    } else if (locked_tcb != stcb) {
                                          SCTP_TCB_LOCK(locked_tcb);
                                    }
                                    if (locked_tcb) {
                                          atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
                                    }
                                    SCTP_INP_WUNLOCK(inp);
                                    SCTP_INP_INFO_RUNLOCK();
                                    return (stcb);
                              }
                        }
                  }
                  SCTP_TCB_UNLOCK(stcb);
            }
      } else {
            SCTP_INP_WLOCK(inp);
            if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                  goto null_return;
            }
            head = &inp->sctp_tcbhash[SCTP_PCBHASH_ALLADDR(rport,
                inp->sctp_hashmark)];
            if (head == NULL) {
                  goto null_return;
            }
            LIST_FOREACH(stcb, head, sctp_tcbhash) {
                  if (stcb->rport != rport) {
                        /* remote port does not match */
                        continue;
                  }
                  SCTP_TCB_LOCK(stcb);
                  if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                        SCTP_TCB_UNLOCK(stcb);
                        continue;
                  }
                  /* now look at the list of remote addresses */
                  TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
#ifdef INVARIANTS
                        if (net == (TAILQ_NEXT(net, sctp_next))) {
                              panic("Corrupt net list");
                        }
#endif
                        if (net->ro._l_addr.sa.sa_family !=
                            remote->sa_family) {
                              /* not the same family */
                              continue;
                        }
                        if (remote->sa_family == AF_INET) {
                              struct sockaddr_in *sin, *rsin;

                              sin = (struct sockaddr_in *)
                                  &net->ro._l_addr;
                              rsin = (struct sockaddr_in *)remote;
                              if (sin->sin_addr.s_addr ==
                                  rsin->sin_addr.s_addr) {
                                    /* found it */
                                    if (netp != NULL) {
                                          *netp = net;
                                    }
                                    if (locked_tcb == NULL) {
                                          SCTP_INP_DECR_REF(inp);
                                    } else if (locked_tcb != stcb) {
                                          SCTP_TCB_LOCK(locked_tcb);
                                    }
                                    if (locked_tcb) {
                                          atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
                                    }
                                    SCTP_INP_WUNLOCK(inp);
                                    SCTP_INP_INFO_RUNLOCK();
                                    return (stcb);
                              }
                        } else if (remote->sa_family == AF_INET6) {
                              struct sockaddr_in6 *sin6, *rsin6;

                              sin6 = (struct sockaddr_in6 *)
                                  &net->ro._l_addr;
                              rsin6 = (struct sockaddr_in6 *)remote;
                              if (SCTP6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
                                  &rsin6->sin6_addr)) {
                                    /* found it */
                                    if (netp != NULL) {
                                          *netp = net;
                                    }
                                    if (locked_tcb == NULL) {
                                          SCTP_INP_DECR_REF(inp);
                                    } else if (locked_tcb != stcb) {
                                          SCTP_TCB_LOCK(locked_tcb);
                                    }
                                    if (locked_tcb) {
                                          atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
                                    }
                                    SCTP_INP_WUNLOCK(inp);
                                    SCTP_INP_INFO_RUNLOCK();
                                    return (stcb);
                              }
                        }
                  }
                  SCTP_TCB_UNLOCK(stcb);
            }
      }
null_return:
      /* clean up for returning null */
      if (locked_tcb) {
            SCTP_TCB_LOCK(locked_tcb);
            atomic_subtract_int(&locked_tcb->asoc.refcnt, 1);
      }
      SCTP_INP_WUNLOCK(inp);
      SCTP_INP_INFO_RUNLOCK();
      /* not found */
      return (NULL);
}

/*
 * Find an association for a specific endpoint using the association id given
 * out in the COMM_UP notification
 */

struct sctp_tcb *
sctp_findassociation_ep_asocid(struct sctp_inpcb *inp, sctp_assoc_t asoc_id, int want_lock)
{
      /*
       * Use my the assoc_id to find a endpoint
       */
      struct sctpasochead *head;
      struct sctp_tcb *stcb;
      uint32_t id;

      if (asoc_id == 0 || inp == NULL) {
            return (NULL);
      }
      SCTP_INP_INFO_RLOCK();
      id = (uint32_t) asoc_id;
      head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(id,
          sctppcbinfo.hashasocmark)];
      if (head == NULL) {
            /* invalid id TSNH */
            SCTP_INP_INFO_RUNLOCK();
            return (NULL);
      }
      LIST_FOREACH(stcb, head, sctp_asocs) {
            SCTP_INP_RLOCK(stcb->sctp_ep);
            if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                  SCTP_INP_RUNLOCK(stcb->sctp_ep);
                  SCTP_INP_INFO_RUNLOCK();
                  return (NULL);
            }
            if (stcb->asoc.assoc_id == id) {
                  /* candidate */
                  if (inp != stcb->sctp_ep) {
                        /*
                         * some other guy has the same id active (id
                         * collision ??).
                         */
                        SCTP_INP_RUNLOCK(stcb->sctp_ep);
                        continue;
                  }
                  if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                        continue;
                  }
                  if (want_lock) {
                        SCTP_TCB_LOCK(stcb);
                  }
                  SCTP_INP_RUNLOCK(stcb->sctp_ep);
                  SCTP_INP_INFO_RUNLOCK();
                  return (stcb);
            }
            SCTP_INP_RUNLOCK(stcb->sctp_ep);
      }
      /* Ok if we missed here, lets try the restart hash */
      head = &sctppcbinfo.sctp_restarthash[SCTP_PCBHASH_ASOC(id, sctppcbinfo.hashrestartmark)];
      if (head == NULL) {
            /* invalid id TSNH */
            SCTP_INP_INFO_RUNLOCK();
            return (NULL);
      }
      LIST_FOREACH(stcb, head, sctp_tcbrestarhash) {
            SCTP_INP_RLOCK(stcb->sctp_ep);
            if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                  SCTP_INP_RUNLOCK(stcb->sctp_ep);
                  continue;
            }
            if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                  continue;
            }
            if (want_lock) {
                  SCTP_TCB_LOCK(stcb);
            }
            if (stcb->asoc.assoc_id == id) {
                  /* candidate */
                  SCTP_INP_RUNLOCK(stcb->sctp_ep);
                  if (inp != stcb->sctp_ep) {
                        /*
                         * some other guy has the same id active (id
                         * collision ??).
                         */
                        if (want_lock) {
                              SCTP_TCB_UNLOCK(stcb);
                        }
                        continue;
                  }
                  SCTP_INP_INFO_RUNLOCK();
                  return (stcb);
            } else {
                  SCTP_INP_RUNLOCK(stcb->sctp_ep);
            }
            if (want_lock) {
                  SCTP_TCB_UNLOCK(stcb);
            }
      }
      SCTP_INP_INFO_RUNLOCK();
      return (NULL);
}


static struct sctp_inpcb *
sctp_endpoint_probe(struct sockaddr *nam, struct sctppcbhead *head,
    uint16_t lport, uint32_t vrf_id)
{
      struct sctp_inpcb *inp;
      struct sockaddr_in *sin;
      struct sockaddr_in6 *sin6;
      struct sctp_laddr *laddr;
      int fnd;

      /*
       * Endpoing probe expects that the INP_INFO is locked.
       */
      if (nam->sa_family == AF_INET) {
            sin = (struct sockaddr_in *)nam;
            sin6 = NULL;
      } else if (nam->sa_family == AF_INET6) {
            sin6 = (struct sockaddr_in6 *)nam;
            sin = NULL;
      } else {
            /* unsupported family */
            return (NULL);
      }
      if (head == NULL)
            return (NULL);
      LIST_FOREACH(inp, head, sctp_hash) {
            SCTP_INP_RLOCK(inp);
            if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) &&
                (inp->sctp_lport == lport)) {
                  /* got it */
                  if ((nam->sa_family == AF_INET) &&
                      (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                      SCTP_IPV6_V6ONLY(inp)) {
                        /* IPv4 on a IPv6 socket with ONLY IPv6 set */
                        SCTP_INP_RUNLOCK(inp);
                        continue;
                  }
                  /* A V6 address and the endpoint is NOT bound V6 */
                  if (nam->sa_family == AF_INET6 &&
                      (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
                        SCTP_INP_RUNLOCK(inp);
                        continue;
                  }
                  /* does a VRF id match? */
                  fnd = 0;
                  if (inp->def_vrf_id == vrf_id)
                        fnd = 1;

                  SCTP_INP_RUNLOCK(inp);
                  if (!fnd)
                        continue;
                  return (inp);
            }
            SCTP_INP_RUNLOCK(inp);
      }

      if ((nam->sa_family == AF_INET) &&
          (sin->sin_addr.s_addr == INADDR_ANY)) {
            /* Can't hunt for one that has no address specified */
            return (NULL);
      } else if ((nam->sa_family == AF_INET6) &&
          (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))) {
            /* Can't hunt for one that has no address specified */
            return (NULL);
      }
      /*
       * ok, not bound to all so see if we can find a EP bound to this
       * address.
       */
      LIST_FOREACH(inp, head, sctp_hash) {
            SCTP_INP_RLOCK(inp);
            if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL)) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            /*
             * Ok this could be a likely candidate, look at all of its
             * addresses
             */
            if (inp->sctp_lport != lport) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            /* does a VRF id match? */
            fnd = 0;
            if (inp->def_vrf_id == vrf_id)
                  fnd = 1;

            if (!fnd) {
                  SCTP_INP_RUNLOCK(inp);
                  continue;
            }
            LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                  if (laddr->ifa == NULL) {
                        SCTPDBG(SCTP_DEBUG_PCB1, "%s: NULL ifa\n",
                            __FUNCTION__);
                        continue;
                  }
                  SCTPDBG(SCTP_DEBUG_PCB1, "Ok laddr->ifa:%p is possible, ",
                      laddr->ifa);
                  if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
                        SCTPDBG(SCTP_DEBUG_PCB1, "Huh IFA being deleted\n");
                        continue;
                  }
                  if (laddr->ifa->address.sa.sa_family == nam->sa_family) {
                        /* possible, see if it matches */
                        struct sockaddr_in *intf_addr;

                        intf_addr = &laddr->ifa->address.sin;
                        if (nam->sa_family == AF_INET) {
                              if (sin->sin_addr.s_addr ==
                                  intf_addr->sin_addr.s_addr) {
                                    SCTP_INP_RUNLOCK(inp);
                                    return (inp);
                              }
                        } else if (nam->sa_family == AF_INET6) {
                              struct sockaddr_in6 *intf_addr6;

                              intf_addr6 = &laddr->ifa->address.sin6;
                              if (SCTP6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
                                  &intf_addr6->sin6_addr)) {
                                    SCTP_INP_RUNLOCK(inp);
                                    return (inp);
                              }
                        }
                  }
            }
            SCTP_INP_RUNLOCK(inp);
      }
      return (NULL);
}

struct sctp_inpcb *
sctp_pcb_findep(struct sockaddr *nam, int find_tcp_pool, int have_lock,
    uint32_t vrf_id)
{
      /*
       * First we check the hash table to see if someone has this port
       * bound with just the port.
       */
      struct sctp_inpcb *inp;
      struct sctppcbhead *head;
      struct sockaddr_in *sin;
      struct sockaddr_in6 *sin6;
      int lport;

      if (nam->sa_family == AF_INET) {
            sin = (struct sockaddr_in *)nam;
            lport = ((struct sockaddr_in *)nam)->sin_port;
      } else if (nam->sa_family == AF_INET6) {
            sin6 = (struct sockaddr_in6 *)nam;
            lport = ((struct sockaddr_in6 *)nam)->sin6_port;
      } else {
            /* unsupported family */
            return (NULL);
      }
      /*
       * I could cheat here and just cast to one of the types but we will
       * do it right. It also provides the check against an Unsupported
       * type too.
       */
      /* Find the head of the ALLADDR chain */
      if (have_lock == 0) {
            SCTP_INP_INFO_RLOCK();
      }
      head = &sctppcbinfo.sctp_ephash[SCTP_PCBHASH_ALLADDR(lport,
          sctppcbinfo.hashmark)];
      inp = sctp_endpoint_probe(nam, head, lport, vrf_id);

      /*
       * If the TCP model exists it could be that the main listening
       * endpoint is gone but there exists a connected socket for this guy
       * yet. If so we can return the first one that we find. This may NOT
       * be the correct one but the sctp_findassociation_ep_addr has
       * further code to look at all TCP models.
       */
      if (inp == NULL && find_tcp_pool) {
            unsigned int i;

            for (i = 0; i < sctppcbinfo.hashtblsize; i++) {
                  /*
                   * This is real gross, but we do NOT have a remote
                   * port at this point depending on who is calling.
                   * We must therefore look for ANY one that matches
                   * our local port :/
                   */
                  head = &sctppcbinfo.sctp_tcpephash[i];
                  if (LIST_FIRST(head)) {
                        inp = sctp_endpoint_probe(nam, head, lport, vrf_id);
                        if (inp) {
                              /* Found one */
                              break;
                        }
                  }
            }
      }
      if (inp) {
            SCTP_INP_INCR_REF(inp);
      }
      if (have_lock == 0) {
            SCTP_INP_INFO_RUNLOCK();
      }
      return (inp);
}

/*
 * Find an association for an endpoint with the pointer to whom you want to
 * send to and the endpoint pointer. The address can be IPv4 or IPv6. We may
 * need to change the *to to some other struct like a mbuf...
 */
struct sctp_tcb *
sctp_findassociation_addr_sa(struct sockaddr *to, struct sockaddr *from,
    struct sctp_inpcb **inp_p, struct sctp_nets **netp, int find_tcp_pool,
    uint32_t vrf_id)
{
      struct sctp_inpcb *inp = NULL;
      struct sctp_tcb *retval;

      SCTP_INP_INFO_RLOCK();
      if (find_tcp_pool) {
            if (inp_p != NULL) {
                  retval = sctp_tcb_special_locate(inp_p, from, to, netp,
                      vrf_id);
            } else {
                  retval = sctp_tcb_special_locate(&inp, from, to, netp,
                      vrf_id);
            }
            if (retval != NULL) {
                  SCTP_INP_INFO_RUNLOCK();
                  return (retval);
            }
      }
      inp = sctp_pcb_findep(to, 0, 1, vrf_id);
      if (inp_p != NULL) {
            *inp_p = inp;
      }
      SCTP_INP_INFO_RUNLOCK();

      if (inp == NULL) {
            return (NULL);
      }
      /*
       * ok, we have an endpoint, now lets find the assoc for it (if any)
       * we now place the source address or from in the to of the find
       * endpoint call. Since in reality this chain is used from the
       * inbound packet side.
       */
      if (inp_p != NULL) {
            retval = sctp_findassociation_ep_addr(inp_p, from, netp, to,
                NULL);
      } else {
            retval = sctp_findassociation_ep_addr(&inp, from, netp, to,
                NULL);
      }
      return retval;
}


/*
 * This routine will grub through the mbuf that is a INIT or INIT-ACK and
 * find all addresses that the sender has specified in any address list. Each
 * address will be used to lookup the TCB and see if one exits.
 */
static struct sctp_tcb *
sctp_findassociation_special_addr(struct mbuf *m, int iphlen, int offset,
    struct sctphdr *sh, struct sctp_inpcb **inp_p, struct sctp_nets **netp,
    struct sockaddr *dest)
{
      struct sockaddr_in sin4;
      struct sockaddr_in6 sin6;
      struct sctp_paramhdr *phdr, parm_buf;
      struct sctp_tcb *retval;
      uint32_t ptype, plen;

      memset(&sin4, 0, sizeof(sin4));
      memset(&sin6, 0, sizeof(sin6));
      sin4.sin_len = sizeof(sin4);
      sin4.sin_family = AF_INET;
      sin4.sin_port = sh->src_port;
      sin6.sin6_len = sizeof(sin6);
      sin6.sin6_family = AF_INET6;
      sin6.sin6_port = sh->src_port;

      retval = NULL;
      offset += sizeof(struct sctp_init_chunk);

      phdr = sctp_get_next_param(m, offset, &parm_buf, sizeof(parm_buf));
      while (phdr != NULL) {
            /* now we must see if we want the parameter */
            ptype = ntohs(phdr->param_type);
            plen = ntohs(phdr->param_length);
            if (plen == 0) {
                  break;
            }
            if (ptype == SCTP_IPV4_ADDRESS &&
                plen == sizeof(struct sctp_ipv4addr_param)) {
                  /* Get the rest of the address */
                  struct sctp_ipv4addr_param ip4_parm, *p4;

                  phdr = sctp_get_next_param(m, offset,
                      (struct sctp_paramhdr *)&ip4_parm, min(plen, sizeof(ip4_parm)));
                  if (phdr == NULL) {
                        return (NULL);
                  }
                  p4 = (struct sctp_ipv4addr_param *)phdr;
                  memcpy(&sin4.sin_addr, &p4->addr, sizeof(p4->addr));
                  /* look it up */
                  retval = sctp_findassociation_ep_addr(inp_p,
                      (struct sockaddr *)&sin4, netp, dest, NULL);
                  if (retval != NULL) {
                        return (retval);
                  }
            } else if (ptype == SCTP_IPV6_ADDRESS &&
                plen == sizeof(struct sctp_ipv6addr_param)) {
                  /* Get the rest of the address */
                  struct sctp_ipv6addr_param ip6_parm, *p6;

                  phdr = sctp_get_next_param(m, offset,
                      (struct sctp_paramhdr *)&ip6_parm, min(plen, sizeof(ip6_parm)));
                  if (phdr == NULL) {
                        return (NULL);
                  }
                  p6 = (struct sctp_ipv6addr_param *)phdr;
                  memcpy(&sin6.sin6_addr, &p6->addr, sizeof(p6->addr));
                  /* look it up */
                  retval = sctp_findassociation_ep_addr(inp_p,
                      (struct sockaddr *)&sin6, netp, dest, NULL);
                  if (retval != NULL) {
                        return (retval);
                  }
            }
            offset += SCTP_SIZE32(plen);
            phdr = sctp_get_next_param(m, offset, &parm_buf,
                sizeof(parm_buf));
      }
      return (NULL);
}


static struct sctp_tcb *
sctp_findassoc_by_vtag(struct sockaddr *from, uint32_t vtag,
    struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint16_t rport,
    uint16_t lport, int skip_src_check)
{
      /*
       * Use my vtag to hash. If we find it we then verify the source addr
       * is in the assoc. If all goes well we save a bit on rec of a
       * packet.
       */
      struct sctpasochead *head;
      struct sctp_nets *net;
      struct sctp_tcb *stcb;

      *netp = NULL;
      *inp_p = NULL;
      SCTP_INP_INFO_RLOCK();
      head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(vtag,
          sctppcbinfo.hashasocmark)];
      if (head == NULL) {
            /* invalid vtag */
            SCTP_INP_INFO_RUNLOCK();
            return (NULL);
      }
      LIST_FOREACH(stcb, head, sctp_asocs) {
            SCTP_INP_RLOCK(stcb->sctp_ep);
            if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                  SCTP_INP_RUNLOCK(stcb->sctp_ep);
                  continue;
            }
            SCTP_TCB_LOCK(stcb);
            SCTP_INP_RUNLOCK(stcb->sctp_ep);
            if (stcb->asoc.my_vtag == vtag) {
                  /* candidate */
                  if (stcb->rport != rport) {
                        /*
                         * we could remove this if vtags are unique
                         * across the system.
                         */
                        SCTP_TCB_UNLOCK(stcb);
                        continue;
                  }
                  if (stcb->sctp_ep->sctp_lport != lport) {
                        /*
                         * we could remove this if vtags are unique
                         * across the system.
                         */
                        SCTP_TCB_UNLOCK(stcb);
                        continue;
                  }
                  if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                        SCTP_TCB_UNLOCK(stcb);
                        continue;
                  }
                  if (skip_src_check) {
                        *netp = NULL;     /* unknown */
                        if (inp_p)
                              *inp_p = stcb->sctp_ep;
                        SCTP_INP_INFO_RUNLOCK();
                        return (stcb);
                  }
                  net = sctp_findnet(stcb, from);
                  if (net) {
                        /* yep its him. */
                        *netp = net;
                        SCTP_STAT_INCR(sctps_vtagexpress);
                        *inp_p = stcb->sctp_ep;
                        SCTP_INP_INFO_RUNLOCK();
                        return (stcb);
                  } else {
                        /*
                         * not him, this should only happen in rare
                         * cases so I peg it.
                         */
                        SCTP_STAT_INCR(sctps_vtagbogus);
                  }
            }
            SCTP_TCB_UNLOCK(stcb);
      }
      SCTP_INP_INFO_RUNLOCK();
      return (NULL);
}

/*
 * Find an association with the pointer to the inbound IP packet. This can be
 * a IPv4 or IPv6 packet.
 */
struct sctp_tcb *
sctp_findassociation_addr(struct mbuf *m, int iphlen, int offset,
    struct sctphdr *sh, struct sctp_chunkhdr *ch,
    struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint32_t vrf_id)
{
      int find_tcp_pool;
      struct ip *iph;
      struct sctp_tcb *retval;
      struct sockaddr_storage to_store, from_store;
      struct sockaddr *to = (struct sockaddr *)&to_store;
      struct sockaddr *from = (struct sockaddr *)&from_store;
      struct sctp_inpcb *inp;

      iph = mtod(m, struct ip *);
      if (iph->ip_v == IPVERSION) {
            /* its IPv4 */
            struct sockaddr_in *from4;

            from4 = (struct sockaddr_in *)&from_store;
            bzero(from4, sizeof(*from4));
            from4->sin_family = AF_INET;
            from4->sin_len = sizeof(struct sockaddr_in);
            from4->sin_addr.s_addr = iph->ip_src.s_addr;
            from4->sin_port = sh->src_port;
      } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
            /* its IPv6 */
            struct ip6_hdr *ip6;
            struct sockaddr_in6 *from6;

            ip6 = mtod(m, struct ip6_hdr *);
            from6 = (struct sockaddr_in6 *)&from_store;
            bzero(from6, sizeof(*from6));
            from6->sin6_family = AF_INET6;
            from6->sin6_len = sizeof(struct sockaddr_in6);
            from6->sin6_addr = ip6->ip6_src;
            from6->sin6_port = sh->src_port;
            /* Get the scopes in properly to the sin6 addr's */
            /* we probably don't need these operations */
            (void)sa6_recoverscope(from6);
            sa6_embedscope(from6, ip6_use_defzone);
      } else {
            /* Currently not supported. */
            return (NULL);
      }
      if (sh->v_tag) {
            /* we only go down this path if vtag is non-zero */
            retval = sctp_findassoc_by_vtag(from, ntohl(sh->v_tag),
                inp_p, netp, sh->src_port, sh->dest_port, 0);
            if (retval) {
                  return (retval);
            }
      }
      if (iph->ip_v == IPVERSION) {
            /* its IPv4 */
            struct sockaddr_in *to4;

            to4 = (struct sockaddr_in *)&to_store;
            bzero(to4, sizeof(*to4));
            to4->sin_family = AF_INET;
            to4->sin_len = sizeof(struct sockaddr_in);
            to4->sin_addr.s_addr = iph->ip_dst.s_addr;
            to4->sin_port = sh->dest_port;
      } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
            /* its IPv6 */
            struct ip6_hdr *ip6;
            struct sockaddr_in6 *to6;

            ip6 = mtod(m, struct ip6_hdr *);
            to6 = (struct sockaddr_in6 *)&to_store;
            bzero(to6, sizeof(*to6));
            to6->sin6_family = AF_INET6;
            to6->sin6_len = sizeof(struct sockaddr_in6);
            to6->sin6_addr = ip6->ip6_dst;
            to6->sin6_port = sh->dest_port;
            /* Get the scopes in properly to the sin6 addr's */
            /* we probably don't need these operations */
            (void)sa6_recoverscope(to6);
            sa6_embedscope(to6, ip6_use_defzone);
      }
      find_tcp_pool = 0;
      if ((ch->chunk_type != SCTP_INITIATION) &&
          (ch->chunk_type != SCTP_INITIATION_ACK) &&
          (ch->chunk_type != SCTP_COOKIE_ACK) &&
          (ch->chunk_type != SCTP_COOKIE_ECHO)) {
            /* Other chunk types go to the tcp pool. */
            find_tcp_pool = 1;
      }
      if (inp_p) {
            retval = sctp_findassociation_addr_sa(to, from, inp_p, netp,
                find_tcp_pool, vrf_id);
            inp = *inp_p;
      } else {
            retval = sctp_findassociation_addr_sa(to, from, &inp, netp,
                find_tcp_pool, vrf_id);
      }
      SCTPDBG(SCTP_DEBUG_PCB1, "retval:%p inp:%p\n", retval, inp);
      if (retval == NULL && inp) {
            /* Found a EP but not this address */
            if ((ch->chunk_type == SCTP_INITIATION) ||
                (ch->chunk_type == SCTP_INITIATION_ACK)) {
                  /*-
                   * special hook, we do NOT return linp or an
                   * association that is linked to an existing
                   * association that is under the TCP pool (i.e. no
                   * listener exists). The endpoint finding routine
                   * will always find a listner before examining the
                   * TCP pool.
                   */
                  if (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) {
                        if (inp_p) {
                              *inp_p = NULL;
                        }
                        return (NULL);
                  }
                  retval = sctp_findassociation_special_addr(m, iphlen,
                      offset, sh, &inp, netp, to);
                  if (inp_p != NULL) {
                        *inp_p = inp;
                  }
            }
      }
      SCTPDBG(SCTP_DEBUG_PCB1, "retval is %p\n", retval);
      return (retval);
}

/*
 * lookup an association by an ASCONF lookup address.
 * if the lookup address is 0.0.0.0 or ::0, use the vtag to do the lookup
 */
struct sctp_tcb *
sctp_findassociation_ep_asconf(struct mbuf *m, int iphlen, int offset,
    struct sctphdr *sh, struct sctp_inpcb **inp_p, struct sctp_nets **netp)
{
      struct sctp_tcb *stcb;
      struct sockaddr_in *sin;
      struct sockaddr_in6 *sin6;
      struct sockaddr_storage local_store, remote_store;
      struct ip *iph;
      struct sctp_paramhdr parm_buf, *phdr;
      int ptype;
      int zero_address = 0;


      memset(&local_store, 0, sizeof(local_store));
      memset(&remote_store, 0, sizeof(remote_store));

      /* First get the destination address setup too. */
      iph = mtod(m, struct ip *);
      if (iph->ip_v == IPVERSION) {
            /* its IPv4 */
            sin = (struct sockaddr_in *)&local_store;
            sin->sin_family = AF_INET;
            sin->sin_len = sizeof(*sin);
            sin->sin_port = sh->dest_port;
            sin->sin_addr.s_addr = iph->ip_dst.s_addr;
      } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
            /* its IPv6 */
            struct ip6_hdr *ip6;

            ip6 = mtod(m, struct ip6_hdr *);
            sin6 = (struct sockaddr_in6 *)&local_store;
            sin6->sin6_family = AF_INET6;
            sin6->sin6_len = sizeof(*sin6);
            sin6->sin6_port = sh->dest_port;
            sin6->sin6_addr = ip6->ip6_dst;
      } else {
            return NULL;
      }

      phdr = sctp_get_next_param(m, offset + sizeof(struct sctp_asconf_chunk),
          &parm_buf, sizeof(struct sctp_paramhdr));
      if (phdr == NULL) {
            SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf lookup addr\n",
                __FUNCTION__);
            return NULL;
      }
      ptype = (int)((uint32_t) ntohs(phdr->param_type));
      /* get the correlation address */
      if (ptype == SCTP_IPV6_ADDRESS) {
            /* ipv6 address param */
            struct sctp_ipv6addr_param *p6, p6_buf;

            if (ntohs(phdr->param_length) != sizeof(struct sctp_ipv6addr_param)) {
                  return NULL;
            }
            p6 = (struct sctp_ipv6addr_param *)sctp_get_next_param(m,
                offset + sizeof(struct sctp_asconf_chunk),
                &p6_buf.ph, sizeof(*p6));
            if (p6 == NULL) {
                  SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf v6 lookup addr\n",
                      __FUNCTION__);
                  return (NULL);
            }
            sin6 = (struct sockaddr_in6 *)&remote_store;
            sin6->sin6_family = AF_INET6;
            sin6->sin6_len = sizeof(*sin6);
            sin6->sin6_port = sh->src_port;
            memcpy(&sin6->sin6_addr, &p6->addr, sizeof(struct in6_addr));
            if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
                  zero_address = 1;
      } else if (ptype == SCTP_IPV4_ADDRESS) {
            /* ipv4 address param */
            struct sctp_ipv4addr_param *p4, p4_buf;

            if (ntohs(phdr->param_length) != sizeof(struct sctp_ipv4addr_param)) {
                  return NULL;
            }
            p4 = (struct sctp_ipv4addr_param *)sctp_get_next_param(m,
                offset + sizeof(struct sctp_asconf_chunk),
                &p4_buf.ph, sizeof(*p4));
            if (p4 == NULL) {
                  SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf v4 lookup addr\n",
                      __FUNCTION__);
                  return (NULL);
            }
            sin = (struct sockaddr_in *)&remote_store;
            sin->sin_family = AF_INET;
            sin->sin_len = sizeof(*sin);
            sin->sin_port = sh->src_port;
            memcpy(&sin->sin_addr, &p4->addr, sizeof(struct in_addr));
            if (sin->sin_addr.s_addr == INADDR_ANY)
                  zero_address = 1;
      } else {
            /* invalid address param type */
            return NULL;
      }

      if (zero_address) {
            stcb = sctp_findassoc_by_vtag(NULL, ntohl(sh->v_tag), inp_p,
                netp, sh->src_port, sh->dest_port, 1);
            /*
             * printf("findassociation_ep_asconf: zero lookup address
             * finds stcb 0x%x\n", (uint32_t)stcb);
             */
      } else {
            stcb = sctp_findassociation_ep_addr(inp_p,
                (struct sockaddr *)&remote_store, netp,
                (struct sockaddr *)&local_store, NULL);
      }
      return (stcb);
}


/*
 * allocate a sctp_inpcb and setup a temporary binding to a port/all
 * addresses. This way if we don't get a bind we by default pick a ephemeral
 * port with all addresses bound.
 */
int
sctp_inpcb_alloc(struct socket *so, uint32_t vrf_id)
{
      /*
       * we get called when a new endpoint starts up. We need to allocate
       * the sctp_inpcb structure from the zone and init it. Mark it as
       * unbound and find a port that we can use as an ephemeral with
       * INADDR_ANY. If the user binds later no problem we can then add in
       * the specific addresses. And setup the default parameters for the
       * EP.
       */
      int i, error;
      struct sctp_inpcb *inp;
      struct sctp_pcb *m;
      struct timeval time;
      sctp_sharedkey_t *null_key;

      error = 0;

      SCTP_INP_INFO_WLOCK();
      inp = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_ep, struct sctp_inpcb);
      if (inp == NULL) {
            SCTP_PRINTF("Out of SCTP-INPCB structures - no resources\n");
            SCTP_INP_INFO_WUNLOCK();
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
            return (ENOBUFS);
      }
      /* zap it */
      bzero(inp, sizeof(*inp));

      /* bump generations */
      /* setup socket pointers */
      inp->sctp_socket = so;
      inp->ip_inp.inp.inp_socket = so;

      inp->partial_delivery_point = SCTP_SB_LIMIT_RCV(so) >> SCTP_PARTIAL_DELIVERY_SHIFT;
      inp->sctp_frag_point = SCTP_DEFAULT_MAXSEGMENT;

#ifdef IPSEC
      {
            struct inpcbpolicy *pcb_sp = NULL;

            error = ipsec_init_policy(so, &pcb_sp);
            /* Arrange to share the policy */
            inp->ip_inp.inp.inp_sp = pcb_sp;
            ((struct in6pcb *)(&inp->ip_inp.inp))->in6p_sp = pcb_sp;
      }
      if (error != 0) {
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_ep, inp);
            SCTP_INP_INFO_WUNLOCK();
            return error;
      }
#endif                        /* IPSEC */
      SCTP_INCR_EP_COUNT();
      inp->ip_inp.inp.inp_ip_ttl = ip_defttl;
      SCTP_INP_INFO_WUNLOCK();

      so->so_pcb = (caddr_t)inp;

      if ((SCTP_SO_TYPE(so) == SOCK_DGRAM) ||
          (SCTP_SO_TYPE(so) == SOCK_SEQPACKET)) {
            /* UDP style socket */
            inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
                SCTP_PCB_FLAGS_UNBOUND);
            /* Be sure it is NON-BLOCKING IO for UDP */
            /* SCTP_SET_SO_NBIO(so); */
      } else if (SCTP_SO_TYPE(so) == SOCK_STREAM) {
            /* TCP style socket */
            inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
                SCTP_PCB_FLAGS_UNBOUND);
            /* Be sure we have blocking IO by default */
            SCTP_CLEAR_SO_NBIO(so);
      } else {
            /*
             * unsupported socket type (RAW, etc)- in case we missed it
             * in protosw
             */
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EOPNOTSUPP);
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_ep, inp);
            return (EOPNOTSUPP);
      }
      if (sctp_default_frag_interleave == SCTP_FRAG_LEVEL_1) {
            sctp_feature_on(inp, SCTP_PCB_FLAGS_FRAG_INTERLEAVE);
            sctp_feature_off(inp, SCTP_PCB_FLAGS_INTERLEAVE_STRMS);
      } else if (sctp_default_frag_interleave == SCTP_FRAG_LEVEL_2) {
            sctp_feature_on(inp, SCTP_PCB_FLAGS_FRAG_INTERLEAVE);
            sctp_feature_on(inp, SCTP_PCB_FLAGS_INTERLEAVE_STRMS);
      } else if (sctp_default_frag_interleave == SCTP_FRAG_LEVEL_0) {
            sctp_feature_off(inp, SCTP_PCB_FLAGS_FRAG_INTERLEAVE);
            sctp_feature_off(inp, SCTP_PCB_FLAGS_INTERLEAVE_STRMS);
      }
      inp->sctp_tcbhash = SCTP_HASH_INIT(sctp_pcbtblsize,
          &inp->sctp_hashmark);
      if (inp->sctp_tcbhash == NULL) {
            SCTP_PRINTF("Out of SCTP-INPCB->hashinit - no resources\n");
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_ep, inp);
            return (ENOBUFS);
      }
      inp->def_vrf_id = vrf_id;

      SCTP_INP_INFO_WLOCK();
      SCTP_INP_LOCK_INIT(inp);
      INP_LOCK_INIT(&inp->ip_inp.inp, "inp", "sctpinp");
      SCTP_INP_READ_INIT(inp);
      SCTP_ASOC_CREATE_LOCK_INIT(inp);
      /* lock the new ep */
      SCTP_INP_WLOCK(inp);

      /* add it to the info area */
      LIST_INSERT_HEAD(&sctppcbinfo.listhead, inp, sctp_list);
      SCTP_INP_INFO_WUNLOCK();

      TAILQ_INIT(&inp->read_queue);
      LIST_INIT(&inp->sctp_addr_list);

      LIST_INIT(&inp->sctp_asoc_list);

#ifdef SCTP_TRACK_FREED_ASOCS
      /* TEMP CODE */
      LIST_INIT(&inp->sctp_asoc_free_list);
#endif
      /* Init the timer structure for signature change */
      SCTP_OS_TIMER_INIT(&inp->sctp_ep.signature_change.timer);
      inp->sctp_ep.signature_change.type = SCTP_TIMER_TYPE_NEWCOOKIE;

      /* now init the actual endpoint default data */
      m = &inp->sctp_ep;

      /* setup the base timeout information */
      m->sctp_timeoutticks[SCTP_TIMER_SEND] = SEC_TO_TICKS(SCTP_SEND_SEC);    /* needed ? */
      m->sctp_timeoutticks[SCTP_TIMER_INIT] = SEC_TO_TICKS(SCTP_INIT_SEC);    /* needed ? */
      m->sctp_timeoutticks[SCTP_TIMER_RECV] = MSEC_TO_TICKS(sctp_delayed_sack_time_default);
      m->sctp_timeoutticks[SCTP_TIMER_HEARTBEAT] = MSEC_TO_TICKS(sctp_heartbeat_interval_default);
      m->sctp_timeoutticks[SCTP_TIMER_PMTU] = SEC_TO_TICKS(sctp_pmtu_raise_time_default);
      m->sctp_timeoutticks[SCTP_TIMER_MAXSHUTDOWN] = SEC_TO_TICKS(sctp_shutdown_guard_time_default);
      m->sctp_timeoutticks[SCTP_TIMER_SIGNATURE] = SEC_TO_TICKS(sctp_secret_lifetime_default);
      /* all max/min max are in ms */
      m->sctp_maxrto = sctp_rto_max_default;
      m->sctp_minrto = sctp_rto_min_default;
      m->initial_rto = sctp_rto_initial_default;
      m->initial_init_rto_max = sctp_init_rto_max_default;
      m->sctp_sack_freq = sctp_sack_freq_default;

      m->max_open_streams_intome = MAX_SCTP_STREAMS;

      m->max_init_times = sctp_init_rtx_max_default;
      m->max_send_times = sctp_assoc_rtx_max_default;
      m->def_net_failure = sctp_path_rtx_max_default;
      m->sctp_sws_sender = SCTP_SWS_SENDER_DEF;
      m->sctp_sws_receiver = SCTP_SWS_RECEIVER_DEF;
      m->max_burst = sctp_max_burst_default;
      if ((sctp_default_cc_module >= SCTP_CC_RFC2581) &&
          (sctp_default_cc_module <= SCTP_CC_HTCP)) {
            m->sctp_default_cc_module = sctp_default_cc_module;
      } else {
            /* sysctl done with invalid value, set to 2581 */
            m->sctp_default_cc_module = SCTP_CC_RFC2581;
      }
      /* number of streams to pre-open on a association */
      m->pre_open_stream_count = sctp_nr_outgoing_streams_default;

      /* Add adaptation cookie */
      m->adaptation_layer_indicator = 0x504C5253;

      /* seed random number generator */
      m->random_counter = 1;
      m->store_at = SCTP_SIGNATURE_SIZE;
      SCTP_READ_RANDOM(m->random_numbers, sizeof(m->random_numbers));
      sctp_fill_random_store(m);

      /* Minimum cookie size */
      m->size_of_a_cookie = (sizeof(struct sctp_init_msg) * 2) +
          sizeof(struct sctp_state_cookie);
      m->size_of_a_cookie += SCTP_SIGNATURE_SIZE;

      /* Setup the initial secret */
      (void)SCTP_GETTIME_TIMEVAL(&time);
      m->time_of_secret_change = time.tv_sec;

      for (i = 0; i < SCTP_NUMBER_OF_SECRETS; i++) {
            m->secret_key[0][i] = sctp_select_initial_TSN(m);
      }
      sctp_timer_start(SCTP_TIMER_TYPE_NEWCOOKIE, inp, NULL, NULL);

      /* How long is a cookie good for ? */
      m->def_cookie_life = MSEC_TO_TICKS(sctp_valid_cookie_life_default);
      /*
       * Initialize authentication parameters
       */
      m->local_hmacs = sctp_default_supported_hmaclist();
      m->local_auth_chunks = sctp_alloc_chunklist();
      sctp_auth_set_default_chunks(m->local_auth_chunks);
      LIST_INIT(&m->shared_keys);
      /* add default NULL key as key id 0 */
      null_key = sctp_alloc_sharedkey();
      sctp_insert_sharedkey(&m->shared_keys, null_key);
      SCTP_INP_WUNLOCK(inp);
#ifdef SCTP_LOG_CLOSING
      sctp_log_closing(inp, NULL, 12);
#endif
      return (error);
}


void
sctp_move_pcb_and_assoc(struct sctp_inpcb *old_inp, struct sctp_inpcb *new_inp,
    struct sctp_tcb *stcb)
{
      struct sctp_nets *net;
      uint16_t lport, rport;
      struct sctppcbhead *head;
      struct sctp_laddr *laddr, *oladdr;

      atomic_add_int(&stcb->asoc.refcnt, 1);
      SCTP_TCB_UNLOCK(stcb);
      SCTP_INP_INFO_WLOCK();
      SCTP_INP_WLOCK(old_inp);
      SCTP_INP_WLOCK(new_inp);
      SCTP_TCB_LOCK(stcb);
      atomic_subtract_int(&stcb->asoc.refcnt, 1);

      new_inp->sctp_ep.time_of_secret_change =
          old_inp->sctp_ep.time_of_secret_change;
      memcpy(new_inp->sctp_ep.secret_key, old_inp->sctp_ep.secret_key,
          sizeof(old_inp->sctp_ep.secret_key));
      new_inp->sctp_ep.current_secret_number =
          old_inp->sctp_ep.current_secret_number;
      new_inp->sctp_ep.last_secret_number =
          old_inp->sctp_ep.last_secret_number;
      new_inp->sctp_ep.size_of_a_cookie = old_inp->sctp_ep.size_of_a_cookie;

      /* make it so new data pours into the new socket */
      stcb->sctp_socket = new_inp->sctp_socket;
      stcb->sctp_ep = new_inp;

      /* Copy the port across */
      lport = new_inp->sctp_lport = old_inp->sctp_lport;
      rport = stcb->rport;
      /* Pull the tcb from the old association */
      LIST_REMOVE(stcb, sctp_tcbhash);
      LIST_REMOVE(stcb, sctp_tcblist);

      /* Now insert the new_inp into the TCP connected hash */
      head = &sctppcbinfo.sctp_tcpephash[SCTP_PCBHASH_ALLADDR((lport + rport),
          sctppcbinfo.hashtcpmark)];

      LIST_INSERT_HEAD(head, new_inp, sctp_hash);
      /* Its safe to access */
      new_inp->sctp_flags &= ~SCTP_PCB_FLAGS_UNBOUND;

      /* Now move the tcb into the endpoint list */
      LIST_INSERT_HEAD(&new_inp->sctp_asoc_list, stcb, sctp_tcblist);
      /*
       * Question, do we even need to worry about the ep-hash since we
       * only have one connection? Probably not :> so lets get rid of it
       * and not suck up any kernel memory in that.
       */

      /* Ok. Let's restart timer. */
      TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
            sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, new_inp,
                stcb, net);
      }

      SCTP_INP_INFO_WUNLOCK();
      if (new_inp->sctp_tcbhash != NULL) {
            SCTP_HASH_FREE(new_inp->sctp_tcbhash, new_inp->sctp_hashmark);
            new_inp->sctp_tcbhash = NULL;
      }
      if ((new_inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
            /* Subset bound, so copy in the laddr list from the old_inp */
            LIST_FOREACH(oladdr, &old_inp->sctp_addr_list, sctp_nxt_addr) {
                  laddr = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_laddr, struct sctp_laddr);
                  if (laddr == NULL) {
                        /*
                         * Gak, what can we do? This assoc is really
                         * HOSED. We probably should send an abort
                         * here.
                         */
                        SCTPDBG(SCTP_DEBUG_PCB1, "Association hosed in TCP model, out of laddr memory\n");
                        continue;
                  }
                  SCTP_INCR_LADDR_COUNT();
                  bzero(laddr, sizeof(*laddr));
                  (void)SCTP_GETTIME_TIMEVAL(&laddr->start_time);
                  laddr->ifa = oladdr->ifa;
                  atomic_add_int(&laddr->ifa->refcount, 1);
                  LIST_INSERT_HEAD(&new_inp->sctp_addr_list, laddr,
                      sctp_nxt_addr);
                  new_inp->laddr_count++;
            }
      }
      /*
       * Now any running timers need to be adjusted since we really don't
       * care if they are running or not just blast in the new_inp into
       * all of them.
       */

      stcb->asoc.hb_timer.ep = (void *)new_inp;
      stcb->asoc.dack_timer.ep = (void *)new_inp;
      stcb->asoc.asconf_timer.ep = (void *)new_inp;
      stcb->asoc.strreset_timer.ep = (void *)new_inp;
      stcb->asoc.shut_guard_timer.ep = (void *)new_inp;
      stcb->asoc.autoclose_timer.ep = (void *)new_inp;
      stcb->asoc.delayed_event_timer.ep = (void *)new_inp;
      stcb->asoc.delete_prim_timer.ep = (void *)new_inp;
      /* now what about the nets? */
      TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
            net->pmtu_timer.ep = (void *)new_inp;
            net->rxt_timer.ep = (void *)new_inp;
            net->fr_timer.ep = (void *)new_inp;
      }
      SCTP_INP_WUNLOCK(new_inp);
      SCTP_INP_WUNLOCK(old_inp);
}

static int
sctp_isport_inuse(struct sctp_inpcb *inp, uint16_t lport, uint32_t vrf_id)
{
      struct sctppcbhead *head;
      struct sctp_inpcb *t_inp;
      int fnd;

      head = &sctppcbinfo.sctp_ephash[SCTP_PCBHASH_ALLADDR(lport,
          sctppcbinfo.hashmark)];
      LIST_FOREACH(t_inp, head, sctp_hash) {
            if (t_inp->sctp_lport != lport) {
                  continue;
            }
            /* is it in the VRF in question */
            fnd = 0;
            if (t_inp->def_vrf_id == vrf_id)
                  fnd = 1;
            if (!fnd)
                  continue;

            /* This one is in use. */
            /* check the v6/v4 binding issue */
            if ((t_inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                SCTP_IPV6_V6ONLY(t_inp)) {
                  if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                        /* collision in V6 space */
                        return (1);
                  } else {
                        /* inp is BOUND_V4 no conflict */
                        continue;
                  }
            } else if (t_inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                  /* t_inp is bound v4 and v6, conflict always */
                  return (1);
            } else {
                  /* t_inp is bound only V4 */
                  if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                      SCTP_IPV6_V6ONLY(inp)) {
                        /* no conflict */
                        continue;
                  }
                  /* else fall through to conflict */
            }
            return (1);
      }
      return (0);
}



/* sctp_ifap is used to bypass normal local address validation checks */
int
sctp_inpcb_bind(struct socket *so, struct sockaddr *addr,
    struct sctp_ifa *sctp_ifap, struct thread *p)
{
      /* bind a ep to a socket address */
      struct sctppcbhead *head;
      struct sctp_inpcb *inp, *inp_tmp;
      struct inpcb *ip_inp;
      int bindall;
      int prison = 0;
      uint16_t lport;
      int error;
      uint32_t vrf_id;

      lport = 0;
      error = 0;
      bindall = 1;
      inp = (struct sctp_inpcb *)so->so_pcb;
      ip_inp = (struct inpcb *)so->so_pcb;
#ifdef SCTP_DEBUG
      if (addr) {
            SCTPDBG(SCTP_DEBUG_PCB1, "Bind called port:%d\n",
                ntohs(((struct sockaddr_in *)addr)->sin_port));
            SCTPDBG(SCTP_DEBUG_PCB1, "Addr :");
            SCTPDBG_ADDR(SCTP_DEBUG_PCB1, addr);
      }
#endif
      if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 0) {
            /* already did a bind, subsequent binds NOT allowed ! */
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
            return (EINVAL);
      }
#ifdef INVARIANTS
      if (p == NULL)
            panic("null proc/thread");
#endif
      if (p && jailed(p->td_ucred)) {
            prison = 1;
      }
      if (addr != NULL) {
            if (addr->sa_family == AF_INET) {
                  struct sockaddr_in *sin;

                  /* IPV6_V6ONLY socket? */
                  if (SCTP_IPV6_V6ONLY(ip_inp)) {
                        SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
                        return (EINVAL);
                  }
                  if (addr->sa_len != sizeof(*sin)) {
                        SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
                        return (EINVAL);
                  }
                  sin = (struct sockaddr_in *)addr;
                  lport = sin->sin_port;
                  if (prison) {
                        /*
                         * For INADDR_ANY and  LOOPBACK the
                         * prison_ip() call will transmute the ip
                         * address to the proper value (i.e. the IP
                         * address owned by the jail).
                         */
                        if (prison_ip(p->td_ucred, 0, &sin->sin_addr.s_addr)) {
                              SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
                              return (EINVAL);
                        }
                  }
                  if (sin->sin_addr.s_addr != INADDR_ANY) {
                        bindall = 0;
                  }
            } else if (addr->sa_family == AF_INET6) {
                  /* Only for pure IPv6 Address. (No IPv4 Mapped!) */
                  struct sockaddr_in6 *sin6;

                  sin6 = (struct sockaddr_in6 *)addr;

                  if (addr->sa_len != sizeof(*sin6)) {
                        SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
                        return (EINVAL);
                  }
                  lport = sin6->sin6_port;
                  /*
                   * Jail checks for IPv6 should go HERE! i.e. add the
                   * prison_ip() equivilant in this postion to
                   * transmute the addresses to the proper one jailed.
                   */
                  if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                        bindall = 0;
                        /* KAME hack: embed scopeid */
                        if (sa6_embedscope(sin6, ip6_use_defzone) != 0) {
                              SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
                              return (EINVAL);
                        }
                  }
                  /* this must be cleared for ifa_ifwithaddr() */
                  sin6->sin6_scope_id = 0;
            } else {
                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EAFNOSUPPORT);
                  return (EAFNOSUPPORT);
            }
      }
      SCTP_INP_INFO_WLOCK();
      SCTP_INP_WLOCK(inp);
      /* Setup a vrf_id to be the default for the non-bind-all case. */
      vrf_id = inp->def_vrf_id;

      /* increase our count due to the unlock we do */
      SCTP_INP_INCR_REF(inp);
      if (lport) {
            /*
             * Did the caller specify a port? if so we must see if a ep
             * already has this one bound.
             */
            /* got to be root to get at low ports */
            if (ntohs(lport) < IPPORT_RESERVED) {
                  if (p && (error =
                      priv_check(p, PRIV_NETINET_RESERVEDPORT)
                      )) {
                        SCTP_INP_DECR_REF(inp);
                        SCTP_INP_WUNLOCK(inp);
                        SCTP_INP_INFO_WUNLOCK();
                        return (error);
                  }
            }
            if (p == NULL) {
                  SCTP_INP_DECR_REF(inp);
                  SCTP_INP_WUNLOCK(inp);
                  SCTP_INP_INFO_WUNLOCK();
                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
                  return (error);
            }
            SCTP_INP_WUNLOCK(inp);
            if (bindall) {
                  vrf_id = inp->def_vrf_id;
                  inp_tmp = sctp_pcb_findep(addr, 0, 1, vrf_id);
                  if (inp_tmp != NULL) {
                        /*
                         * lock guy returned and lower count note
                         * that we are not bound so inp_tmp should
                         * NEVER be inp. And it is this inp
                         * (inp_tmp) that gets the reference bump,
                         * so we must lower it.
                         */
                        SCTP_INP_DECR_REF(inp_tmp);
                        SCTP_INP_DECR_REF(inp);
                        /* unlock info */
                        SCTP_INP_INFO_WUNLOCK();
                        SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EADDRINUSE);
                        return (EADDRINUSE);
                  }
            } else {
                  inp_tmp = sctp_pcb_findep(addr, 0, 1, vrf_id);
                  if (inp_tmp != NULL) {
                        /*
                         * lock guy returned and lower count note
                         * that we are not bound so inp_tmp should
                         * NEVER be inp. And it is this inp
                         * (inp_tmp) that gets the reference bump,
                         * so we must lower it.
                         */
                        SCTP_INP_DECR_REF(inp_tmp);
                        SCTP_INP_DECR_REF(inp);
                        /* unlock info */
                        SCTP_INP_INFO_WUNLOCK();
                        SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EADDRINUSE);
                        return (EADDRINUSE);
                  }
            }
            SCTP_INP_WLOCK(inp);
            if (bindall) {
                  /* verify that no lport is not used by a singleton */
                  if (sctp_isport_inuse(inp, lport, vrf_id)) {
                        /* Sorry someone already has this one bound */
                        SCTP_INP_DECR_REF(inp);
                        SCTP_INP_WUNLOCK(inp);
                        SCTP_INP_INFO_WUNLOCK();
                        SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EADDRINUSE);
                        return (EADDRINUSE);
                  }
            }
      } else {
            uint16_t first, last, candidate;
            uint16_t count;
            int done;

            if (ip_inp->inp_flags & INP_HIGHPORT) {
                  first = ipport_hifirstauto;
                  last = ipport_hilastauto;
            } else if (ip_inp->inp_flags & INP_LOWPORT) {
                  if (p && (error =
                      priv_check(p, PRIV_NETINET_RESERVEDPORT)
                      )) {
                        SCTP_INP_DECR_REF(inp);
                        SCTP_INP_WUNLOCK(inp);
                        SCTP_INP_INFO_WUNLOCK();
                        SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
                        return (error);
                  }
                  first = ipport_lowfirstauto;
                  last = ipport_lowlastauto;
            } else {
                  first = ipport_firstauto;
                  last = ipport_lastauto;
            }
            if (first > last) {
                  uint16_t temp;

                  temp = first;
                  first = last;
                  last = temp;
            }
            count = last - first + 1;     /* number of candidates */
            candidate = first + sctp_select_initial_TSN(&inp->sctp_ep) % (count);

            done = 0;
            while (!done) {
                  if (sctp_isport_inuse(inp, htons(candidate), inp->def_vrf_id) == 0) {
                        done = 1;
                  }
                  if (!done) {
                        if (--count == 0) {
                              SCTP_INP_DECR_REF(inp);
                              SCTP_INP_WUNLOCK(inp);
                              SCTP_INP_INFO_WUNLOCK();
                              SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EADDRINUSE);
                              return (EADDRINUSE);
                        }
                        if (candidate == last)
                              candidate = first;
                        else
                              candidate = candidate + 1;
                  }
            }
            lport = htons(candidate);
      }
      SCTP_INP_DECR_REF(inp);
      if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE |
          SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
            /*
             * this really should not happen. The guy did a non-blocking
             * bind and then did a close at the same time.
             */
            SCTP_INP_WUNLOCK(inp);
            SCTP_INP_INFO_WUNLOCK();
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
            return (EINVAL);
      }
      /* ok we look clear to give out this port, so lets setup the binding */
      if (bindall) {
            /* binding to all addresses, so just set in the proper flags */
            inp->sctp_flags |= SCTP_PCB_FLAGS_BOUNDALL;
            /* set the automatic addr changes from kernel flag */
            if (sctp_auto_asconf == 0) {
                  sctp_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF);
                  sctp_feature_off(inp, SCTP_PCB_FLAGS_AUTO_ASCONF);
            } else {
                  sctp_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF);
                  sctp_feature_on(inp, SCTP_PCB_FLAGS_AUTO_ASCONF);
            }
            /*
             * set the automatic mobility_base from kernel flag (by
             * micchie)
             */
            if (sctp_mobility_base == 0) {
                  sctp_mobility_feature_off(inp, SCTP_MOBILITY_BASE);
                  sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
            } else {
                  sctp_mobility_feature_on(inp, SCTP_MOBILITY_BASE);
                  sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
            }
            /*
             * set the automatic mobility_fasthandoff from kernel flag
             * (by micchie)
             */
            if (sctp_mobility_fasthandoff == 0) {
                  sctp_mobility_feature_off(inp, SCTP_MOBILITY_FASTHANDOFF);
                  sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
            } else {
                  sctp_mobility_feature_on(inp, SCTP_MOBILITY_FASTHANDOFF);
                  sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
            }
      } else {
            /*
             * bind specific, make sure flags is off and add a new
             * address structure to the sctp_addr_list inside the ep
             * structure.
             * 
             * We will need to allocate one and insert it at the head. The
             * socketopt call can just insert new addresses in there as
             * well. It will also have to do the embed scope kame hack
             * too (before adding).
             */
            struct sctp_ifa *ifa;
            struct sockaddr_storage store_sa;

            memset(&store_sa, 0, sizeof(store_sa));
            if (addr->sa_family == AF_INET) {
                  struct sockaddr_in *sin;

                  sin = (struct sockaddr_in *)&store_sa;
                  memcpy(sin, addr, sizeof(struct sockaddr_in));
                  sin->sin_port = 0;
            } else if (addr->sa_family == AF_INET6) {
                  struct sockaddr_in6 *sin6;

                  sin6 = (struct sockaddr_in6 *)&store_sa;
                  memcpy(sin6, addr, sizeof(struct sockaddr_in6));
                  sin6->sin6_port = 0;
            }
            /*
             * first find the interface with the bound address need to
             * zero out the port to find the address! yuck! can't do
             * this earlier since need port for sctp_pcb_findep()
             */
            if (sctp_ifap != NULL)
                  ifa = sctp_ifap;
            else {
                  /*
                   * Note for BSD we hit here always other O/S's will
                   * pass things in via the sctp_ifap argument
                   * (Panda).
                   */
                  ifa = sctp_find_ifa_by_addr((struct sockaddr *)&store_sa,
                      vrf_id, SCTP_ADDR_NOT_LOCKED);
            }
            if (ifa == NULL) {
                  /* Can't find an interface with that address */
                  SCTP_INP_WUNLOCK(inp);
                  SCTP_INP_INFO_WUNLOCK();
                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EADDRNOTAVAIL);
                  return (EADDRNOTAVAIL);
            }
            if (addr->sa_family == AF_INET6) {
                  /* GAK, more FIXME IFA lock? */
                  if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                        /* Can't bind a non-existent addr. */
                        SCTP_INP_WUNLOCK(inp);
                        SCTP_INP_INFO_WUNLOCK();
                        SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
                        return (EINVAL);
                  }
            }
            /* we're not bound all */
            inp->sctp_flags &= ~SCTP_PCB_FLAGS_BOUNDALL;
            /* allow bindx() to send ASCONF's for binding changes */
            sctp_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF);
            /* clear automatic addr changes from kernel flag */
            sctp_feature_off(inp, SCTP_PCB_FLAGS_AUTO_ASCONF);

            /* add this address to the endpoint list */
            error = sctp_insert_laddr(&inp->sctp_addr_list, ifa, 0);
            if (error != 0) {
                  SCTP_INP_WUNLOCK(inp);
                  SCTP_INP_INFO_WUNLOCK();
                  return (error);
            }
            inp->laddr_count++;
      }
      /* find the bucket */
      head = &sctppcbinfo.sctp_ephash[SCTP_PCBHASH_ALLADDR(lport,
          sctppcbinfo.hashmark)];
      /* put it in the bucket */
      LIST_INSERT_HEAD(head, inp, sctp_hash);
      SCTPDBG(SCTP_DEBUG_PCB1, "Main hash to bind at head:%p, bound port:%d\n",
          head, ntohs(lport));
      /* set in the port */
      inp->sctp_lport = lport;

      /* turn off just the unbound flag */
      inp->sctp_flags &= ~SCTP_PCB_FLAGS_UNBOUND;
      SCTP_INP_WUNLOCK(inp);
      SCTP_INP_INFO_WUNLOCK();
      return (0);
}


static void
sctp_iterator_inp_being_freed(struct sctp_inpcb *inp, struct sctp_inpcb *inp_next)
{
      struct sctp_iterator *it;

      /*
       * We enter with the only the ITERATOR_LOCK in place and a write
       * lock on the inp_info stuff.
       */

      /*
       * Go through all iterators, we must do this since it is possible
       * that some iterator does NOT have the lock, but is waiting for it.
       * And the one that had the lock has either moved in the last
       * iteration or we just cleared it above. We need to find all of
       * those guys. The list of iterators should never be very big
       * though.
       */
      TAILQ_FOREACH(it, &sctppcbinfo.iteratorhead, sctp_nxt_itr) {
            if (it == inp->inp_starting_point_for_iterator)
                  /* skip this guy, he's special */
                  continue;
            if (it->inp == inp) {
                  /*
                   * This is tricky and we DON'T lock the iterator.
                   * Reason is he's running but waiting for me since
                   * inp->inp_starting_point_for_iterator has the lock
                   * on me (the guy above we skipped). This tells us
                   * its is not running but waiting for
                   * inp->inp_starting_point_for_iterator to be
                   * released by the guy that does have our INP in a
                   * lock.
                   */
                  if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
                        it->inp = NULL;
                        it->stcb = NULL;
                  } else {
                        /* set him up to do the next guy not me */
                        it->inp = inp_next;
                        it->stcb = NULL;
                  }
            }
      }
      it = inp->inp_starting_point_for_iterator;
      if (it) {
            if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
                  it->inp = NULL;
            } else {
                  it->inp = inp_next;
            }
            it->stcb = NULL;
      }
}

/* release sctp_inpcb unbind the port */
void
sctp_inpcb_free(struct sctp_inpcb *inp, int immediate, int from)
{
      /*
       * Here we free a endpoint. We must find it (if it is in the Hash
       * table) and remove it from there. Then we must also find it in the
       * overall list and remove it from there. After all removals are
       * complete then any timer has to be stopped. Then start the actual
       * freeing. a) Any local lists. b) Any associations. c) The hash of
       * all associations. d) finally the ep itself.
       */
      struct sctp_pcb *m;
      struct sctp_inpcb *inp_save;
      struct sctp_tcb *asoc, *nasoc;
      struct sctp_laddr *laddr, *nladdr;
      struct inpcb *ip_pcb;
      struct socket *so;

      struct sctp_queued_to_read *sq;


      int cnt;
      sctp_sharedkey_t *shared_key;


#ifdef SCTP_LOG_CLOSING
      sctp_log_closing(inp, NULL, 0);
#endif
      SCTP_ITERATOR_LOCK();
      so = inp->sctp_socket;
      if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
            /* been here before.. eeks.. get out of here */
            SCTP_PRINTF("This conflict in free SHOULD not be happening! from %d, imm %d\n", from, immediate);
            SCTP_ITERATOR_UNLOCK();
#ifdef SCTP_LOG_CLOSING
            sctp_log_closing(inp, NULL, 1);
#endif
            return;
      }
      SCTP_ASOC_CREATE_LOCK(inp);
      SCTP_INP_INFO_WLOCK();

      SCTP_INP_WLOCK(inp);
      /* First time through we have the socket lock, after that no more. */
      if (from == SCTP_CALLED_AFTER_CMPSET_OFCLOSE) {
            /*
             * Once we are in we can remove the flag from = 1 is only
             * passed from the actual closing routines that are called
             * via the sockets layer.
             */
            inp->sctp_flags &= ~SCTP_PCB_FLAGS_CLOSE_IP;
            /* socket is gone, so no more wakeups allowed */
            inp->sctp_flags |= SCTP_PCB_FLAGS_DONT_WAKE;
            inp->sctp_flags &= ~SCTP_PCB_FLAGS_WAKEINPUT;
            inp->sctp_flags &= ~SCTP_PCB_FLAGS_WAKEOUTPUT;
      }
      sctp_timer_stop(SCTP_TIMER_TYPE_NEWCOOKIE, inp, NULL, NULL,
          SCTP_FROM_SCTP_PCB + SCTP_LOC_1);

      if (inp->control) {
            sctp_m_freem(inp->control);
            inp->control = NULL;
      }
      if (inp->pkt) {
            sctp_m_freem(inp->pkt);
            inp->pkt = NULL;
      }
      m = &inp->sctp_ep;
      ip_pcb = &inp->ip_inp.inp;    /* we could just cast the main pointer
                               * here but I will be nice :> (i.e.
                               * ip_pcb = ep;) */
      if (immediate == SCTP_FREE_SHOULD_USE_GRACEFUL_CLOSE) {
            int cnt_in_sd;

            cnt_in_sd = 0;
            for ((asoc = LIST_FIRST(&inp->sctp_asoc_list)); asoc != NULL;
                asoc = nasoc) {
                  SCTP_TCB_LOCK(asoc);
                  nasoc = LIST_NEXT(asoc, sctp_tcblist);
                  if (asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                        /* Skip guys being freed */
                        /* asoc->sctp_socket = NULL; FIXME MT */
                        cnt_in_sd++;
                        SCTP_TCB_UNLOCK(asoc);
                        continue;
                  }
                  if ((SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_COOKIE_WAIT) ||
                      (SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
                        /*
                         * If we have data in queue, we don't want
                         * to just free since the app may have done,
                         * send()/close or connect/send/close. And
                         * it wants the data to get across first.
                         */
                        /* Just abandon things in the front states */
                        if (sctp_free_assoc(inp, asoc, SCTP_PCBFREE_NOFORCE,
                            SCTP_FROM_SCTP_PCB + SCTP_LOC_2) == 0) {
                              cnt_in_sd++;
                        }
                        continue;
                  }
                  /* Disconnect the socket please */
                  asoc->sctp_socket = NULL;
                  asoc->asoc.state |= SCTP_STATE_CLOSED_SOCKET;
                  if ((asoc->asoc.size_on_reasm_queue > 0) ||
                      (asoc->asoc.control_pdapi) ||
                      (asoc->asoc.size_on_all_streams > 0) ||
                      (so && (so->so_rcv.sb_cc > 0))
                      ) {
                        /* Left with Data unread */
                        struct mbuf *op_err;

                        op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
                            0, M_DONTWAIT, 1, MT_DATA);
                        if (op_err) {
                              /* Fill in the user initiated abort */
                              struct sctp_paramhdr *ph;
                              uint32_t *ippp;

                              SCTP_BUF_LEN(op_err) =
                                  sizeof(struct sctp_paramhdr) + sizeof(uint32_t);
                              ph = mtod(op_err,
                                  struct sctp_paramhdr *);
                              ph->param_type = htons(
                                  SCTP_CAUSE_USER_INITIATED_ABT);
                              ph->param_length = htons(SCTP_BUF_LEN(op_err));
                              ippp = (uint32_t *) (ph + 1);
                              *ippp = htonl(SCTP_FROM_SCTP_PCB + SCTP_LOC_3);
                        }
                        asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_3;
#if defined(SCTP_PANIC_ON_ABORT)
                        panic("inpcb_free does an abort");
#endif
                        sctp_send_abort_tcb(asoc, op_err, SCTP_SO_LOCKED);
                        SCTP_STAT_INCR_COUNTER32(sctps_aborted);
                        if ((SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_OPEN) ||
                            (SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
                              SCTP_STAT_DECR_GAUGE32(sctps_currestab);
                        }
                        if (sctp_free_assoc(inp, asoc,
                            SCTP_PCBFREE_NOFORCE, SCTP_FROM_SCTP_PCB + SCTP_LOC_4) == 0) {
                              cnt_in_sd++;
                        }
                        continue;
                  } else if (TAILQ_EMPTY(&asoc->asoc.send_queue) &&
                            TAILQ_EMPTY(&asoc->asoc.sent_queue) &&
                            (asoc->asoc.stream_queue_cnt == 0)
                      ) {
                        if (asoc->asoc.locked_on_sending) {
                              goto abort_anyway;
                        }
                        if ((SCTP_GET_STATE(&asoc->asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
                            (SCTP_GET_STATE(&asoc->asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
                              /*
                               * there is nothing queued to send,
                               * so I send shutdown
                               */
                              sctp_send_shutdown(asoc, asoc->asoc.primary_destination);
                              if ((SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_OPEN) ||
                                  (SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
                                    SCTP_STAT_DECR_GAUGE32(sctps_currestab);
                              }
                              SCTP_SET_STATE(&asoc->asoc, SCTP_STATE_SHUTDOWN_SENT);
                              SCTP_CLEAR_SUBSTATE(&asoc->asoc, SCTP_STATE_SHUTDOWN_PENDING);
                              sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, asoc->sctp_ep, asoc,
                                  asoc->asoc.primary_destination);
                              sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, asoc->sctp_ep, asoc,
                                  asoc->asoc.primary_destination);
                              sctp_chunk_output(inp, asoc, SCTP_OUTPUT_FROM_SHUT_TMR, SCTP_SO_LOCKED);
                        }
                  } else {
                        /* mark into shutdown pending */
                        struct sctp_stream_queue_pending *sp;

                        asoc->asoc.state |= SCTP_STATE_SHUTDOWN_PENDING;
                        sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, asoc->sctp_ep, asoc,
                            asoc->asoc.primary_destination);
                        if (asoc->asoc.locked_on_sending) {
                              sp = TAILQ_LAST(&((asoc->asoc.locked_on_sending)->outqueue),
                                  sctp_streamhead);
                              if (sp == NULL) {
                                    SCTP_PRINTF("Error, sp is NULL, locked on sending is %p strm:%d\n",
                                        asoc->asoc.locked_on_sending,
                                        asoc->asoc.locked_on_sending->stream_no);
                              } else {
                                    if ((sp->length == 0) && (sp->msg_is_complete == 0))
                                          asoc->asoc.state |= SCTP_STATE_PARTIAL_MSG_LEFT;
                              }
                        }
                        if (TAILQ_EMPTY(&asoc->asoc.send_queue) &&
                            TAILQ_EMPTY(&asoc->asoc.sent_queue) &&
                            (asoc->asoc.state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
                              struct mbuf *op_err;

                  abort_anyway:
                              op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
                                  0, M_DONTWAIT, 1, MT_DATA);
                              if (op_err) {
                                    /*
                                     * Fill in the user
                                     * initiated abort
                                     */
                                    struct sctp_paramhdr *ph;
                                    uint32_t *ippp;

                                    SCTP_BUF_LEN(op_err) =
                                        (sizeof(struct sctp_paramhdr) +
                                        sizeof(uint32_t));
                                    ph = mtod(op_err,
                                        struct sctp_paramhdr *);
                                    ph->param_type = htons(
                                        SCTP_CAUSE_USER_INITIATED_ABT);
                                    ph->param_length = htons(SCTP_BUF_LEN(op_err));
                                    ippp = (uint32_t *) (ph + 1);
                                    *ippp = htonl(SCTP_FROM_SCTP_PCB + SCTP_LOC_5);
                              }
                              asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_5;
#if defined(SCTP_PANIC_ON_ABORT)
                              panic("inpcb_free does an abort");
#endif

                              sctp_send_abort_tcb(asoc, op_err, SCTP_SO_LOCKED);
                              SCTP_STAT_INCR_COUNTER32(sctps_aborted);
                              if ((SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_OPEN) ||
                                  (SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
                                    SCTP_STAT_DECR_GAUGE32(sctps_currestab);
                              }
                              if (sctp_free_assoc(inp, asoc,
                                  SCTP_PCBFREE_NOFORCE,
                                  SCTP_FROM_SCTP_PCB + SCTP_LOC_6) == 0) {
                                    cnt_in_sd++;
                              }
                              continue;
                        } else {
                              sctp_chunk_output(inp, asoc, SCTP_OUTPUT_FROM_CLOSING, SCTP_SO_LOCKED);
                        }
                  }
                  cnt_in_sd++;
                  SCTP_TCB_UNLOCK(asoc);
            }
            /* now is there some left in our SHUTDOWN state? */
            if (cnt_in_sd) {
                  SCTP_INP_WUNLOCK(inp);
                  SCTP_ASOC_CREATE_UNLOCK(inp);
                  SCTP_INP_INFO_WUNLOCK();
                  SCTP_ITERATOR_UNLOCK();
#ifdef SCTP_LOG_CLOSING
                  sctp_log_closing(inp, NULL, 2);
#endif
                  return;
            }
      }
      inp->sctp_socket = NULL;
      if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) !=
          SCTP_PCB_FLAGS_UNBOUND) {
            /*
             * ok, this guy has been bound. It's port is somewhere in
             * the sctppcbinfo hash table. Remove it!
             */
            LIST_REMOVE(inp, sctp_hash);
            inp->sctp_flags |= SCTP_PCB_FLAGS_UNBOUND;
      }
      /*
       * If there is a timer running to kill us, forget it, since it may
       * have a contest on the INP lock.. which would cause us to die ...
       */
      cnt = 0;
      for ((asoc = LIST_FIRST(&inp->sctp_asoc_list)); asoc != NULL;
          asoc = nasoc) {
            nasoc = LIST_NEXT(asoc, sctp_tcblist);
            if (asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                  cnt++;
                  continue;
            }
            /* Free associations that are NOT killing us */
            SCTP_TCB_LOCK(asoc);
            if ((SCTP_GET_STATE(&asoc->asoc) != SCTP_STATE_COOKIE_WAIT) &&
                ((asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0)) {
                  struct mbuf *op_err;
                  uint32_t *ippp;

                  op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
                      0, M_DONTWAIT, 1, MT_DATA);
                  if (op_err) {
                        /* Fill in the user initiated abort */
                        struct sctp_paramhdr *ph;

                        SCTP_BUF_LEN(op_err) = (sizeof(struct sctp_paramhdr) +
                            sizeof(uint32_t));
                        ph = mtod(op_err, struct sctp_paramhdr *);
                        ph->param_type = htons(
                            SCTP_CAUSE_USER_INITIATED_ABT);
                        ph->param_length = htons(SCTP_BUF_LEN(op_err));
                        ippp = (uint32_t *) (ph + 1);
                        *ippp = htonl(SCTP_FROM_SCTP_PCB + SCTP_LOC_7);

                  }
                  asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_7;
#if defined(SCTP_PANIC_ON_ABORT)
                  panic("inpcb_free does an abort");
#endif
                  sctp_send_abort_tcb(asoc, op_err, SCTP_SO_LOCKED);
                  SCTP_STAT_INCR_COUNTER32(sctps_aborted);
            } else if (asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
                  cnt++;
                  SCTP_TCB_UNLOCK(asoc);
                  continue;
            }
            if ((SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_OPEN) ||
                (SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
                  SCTP_STAT_DECR_GAUGE32(sctps_currestab);
            }
            if (sctp_free_assoc(inp, asoc, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_PCB + SCTP_LOC_8) == 0) {
                  cnt++;
            }
      }
      if (cnt) {
            /* Ok we have someone out there that will kill us */
            (void)SCTP_OS_TIMER_STOP(&inp->sctp_ep.signature_change.timer);
            SCTP_INP_WUNLOCK(inp);
            SCTP_ASOC_CREATE_UNLOCK(inp);
            SCTP_INP_INFO_WUNLOCK();
            SCTP_ITERATOR_UNLOCK();
#ifdef SCTP_LOG_CLOSING
            sctp_log_closing(inp, NULL, 3);
#endif
            return;
      }
      if ((inp->refcount) || (inp->sctp_flags & SCTP_PCB_FLAGS_CLOSE_IP)) {
            (void)SCTP_OS_TIMER_STOP(&inp->sctp_ep.signature_change.timer);
            sctp_timer_start(SCTP_TIMER_TYPE_INPKILL, inp, NULL, NULL);
            SCTP_INP_WUNLOCK(inp);
            SCTP_ASOC_CREATE_UNLOCK(inp);
            SCTP_INP_INFO_WUNLOCK();
            SCTP_ITERATOR_UNLOCK();
#ifdef SCTP_LOG_CLOSING
            sctp_log_closing(inp, NULL, 4);
#endif
            return;
      }
      (void)SCTP_OS_TIMER_STOP(&inp->sctp_ep.signature_change.timer);
      inp->sctp_ep.signature_change.type = 0;
      inp->sctp_flags |= SCTP_PCB_FLAGS_SOCKET_ALLGONE;

#ifdef SCTP_LOG_CLOSING
      sctp_log_closing(inp, NULL, 5);
#endif

      (void)SCTP_OS_TIMER_STOP(&inp->sctp_ep.signature_change.timer);
      inp->sctp_ep.signature_change.type = SCTP_TIMER_TYPE_NONE;
      /* Clear the read queue */
      /* sa_ignore FREED_MEMORY */
      while ((sq = TAILQ_FIRST(&inp->read_queue)) != NULL) {
            /* Its only abandoned if it had data left */
            if (sq->length)
                  SCTP_STAT_INCR(sctps_left_abandon);

            TAILQ_REMOVE(&inp->read_queue, sq, next);
            sctp_free_remote_addr(sq->whoFrom);
            if (so)
                  so->so_rcv.sb_cc -= sq->length;
            if (sq->data) {
                  sctp_m_freem(sq->data);
                  sq->data = NULL;
            }
            /*
             * no need to free the net count, since at this point all
             * assoc's are gone.
             */
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_readq, sq);
            SCTP_DECR_READQ_COUNT();
      }
      /* Now the sctp_pcb things */
      /*
       * free each asoc if it is not already closed/free. we can't use the
       * macro here since le_next will get freed as part of the
       * sctp_free_assoc() call.
       */
      cnt = 0;
      if (so) {
#ifdef IPSEC
            ipsec4_delete_pcbpolicy(ip_pcb);
#endif                        /* IPSEC */

            /* Unlocks not needed since the socket is gone now */
      }
      if (ip_pcb->inp_options) {
            (void)sctp_m_free(ip_pcb->inp_options);
            ip_pcb->inp_options = 0;
      }
      if (ip_pcb->inp_moptions) {
            inp_freemoptions(ip_pcb->inp_moptions);
            ip_pcb->inp_moptions = 0;
      }
#ifdef INET6
      if (ip_pcb->inp_vflag & INP_IPV6) {
            struct in6pcb *in6p;

            in6p = (struct in6pcb *)inp;
            ip6_freepcbopts(in6p->in6p_outputopts);
      }
#endif                        /* INET6 */
      ip_pcb->inp_vflag = 0;
      /* free up authentication fields */
      if (inp->sctp_ep.local_auth_chunks != NULL)
            sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
      if (inp->sctp_ep.local_hmacs != NULL)
            sctp_free_hmaclist(inp->sctp_ep.local_hmacs);

      shared_key = LIST_FIRST(&inp->sctp_ep.shared_keys);
      while (shared_key) {
            LIST_REMOVE(shared_key, next);
            sctp_free_sharedkey(shared_key);
            /* sa_ignore FREED_MEMORY */
            shared_key = LIST_FIRST(&inp->sctp_ep.shared_keys);
      }

      inp_save = LIST_NEXT(inp, sctp_list);
      LIST_REMOVE(inp, sctp_list);

      /* fix any iterators only after out of the list */
      sctp_iterator_inp_being_freed(inp, inp_save);
      /*
       * if we have an address list the following will free the list of
       * ifaddr's that are set into this ep. Again macro limitations here,
       * since the LIST_FOREACH could be a bad idea.
       */
      for ((laddr = LIST_FIRST(&inp->sctp_addr_list)); laddr != NULL;
          laddr = nladdr) {
            nladdr = LIST_NEXT(laddr, sctp_nxt_addr);
            sctp_remove_laddr(laddr);
      }

#ifdef SCTP_TRACK_FREED_ASOCS
      /* TEMP CODE */
      for ((asoc = LIST_FIRST(&inp->sctp_asoc_free_list)); asoc != NULL;
          asoc = nasoc) {
            nasoc = LIST_NEXT(asoc, sctp_tcblist);
            LIST_REMOVE(asoc, sctp_tcblist);
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, asoc);
            SCTP_DECR_ASOC_COUNT();
      }
      /* *** END TEMP CODE *** */
#endif
      /* Now lets see about freeing the EP hash table. */
      if (inp->sctp_tcbhash != NULL) {
            SCTP_HASH_FREE(inp->sctp_tcbhash, inp->sctp_hashmark);
            inp->sctp_tcbhash = NULL;
      }
      /* Now we must put the ep memory back into the zone pool */
      INP_LOCK_DESTROY(&inp->ip_inp.inp);
      SCTP_INP_LOCK_DESTROY(inp);
      SCTP_INP_READ_DESTROY(inp);
      SCTP_ASOC_CREATE_LOCK_DESTROY(inp);
      SCTP_INP_INFO_WUNLOCK();
      SCTP_ITERATOR_UNLOCK();
      SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_ep, inp);
      SCTP_DECR_EP_COUNT();
}


struct sctp_nets *
sctp_findnet(struct sctp_tcb *stcb, struct sockaddr *addr)
{
      struct sctp_nets *net;

      /* locate the address */
      TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
            if (sctp_cmpaddr(addr, (struct sockaddr *)&net->ro._l_addr))
                  return (net);
      }
      return (NULL);
}


int
sctp_is_address_on_local_host(struct sockaddr *addr, uint32_t vrf_id)
{
      struct sctp_ifa *sctp_ifa;

      sctp_ifa = sctp_find_ifa_by_addr(addr, vrf_id, SCTP_ADDR_NOT_LOCKED);
      if (sctp_ifa) {
            return (1);
      } else {
            return (0);
      }
}

/*
 * add's a remote endpoint address, done with the INIT/INIT-ACK as well as
 * when a ASCONF arrives that adds it. It will also initialize all the cwnd
 * stats of stuff.
 */
int
sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
    int set_scope, int from)
{
      /*
       * The following is redundant to the same lines in the
       * sctp_aloc_assoc() but is needed since other's call the add
       * address function
       */
      struct sctp_nets *net, *netfirst;
      int addr_inscope;

      SCTPDBG(SCTP_DEBUG_PCB1, "Adding an address (from:%d) to the peer: ",
          from);
      SCTPDBG_ADDR(SCTP_DEBUG_PCB1, newaddr);

      netfirst = sctp_findnet(stcb, newaddr);
      if (netfirst) {
            /*
             * Lie and return ok, we don't want to make the association
             * go away for this behavior. It will happen in the TCP
             * model in a connected socket. It does not reach the hash
             * table until after the association is built so it can't be
             * found. Mark as reachable, since the initial creation will
             * have been cleared and the NOT_IN_ASSOC flag will have
             * been added... and we don't want to end up removing it
             * back out.
             */
            if (netfirst->dest_state & SCTP_ADDR_UNCONFIRMED) {
                  netfirst->dest_state = (SCTP_ADDR_REACHABLE |
                      SCTP_ADDR_UNCONFIRMED);
            } else {
                  netfirst->dest_state = SCTP_ADDR_REACHABLE;
            }

            return (0);
      }
      addr_inscope = 1;
      if (newaddr->sa_family == AF_INET) {
            struct sockaddr_in *sin;

            sin = (struct sockaddr_in *)newaddr;
            if (sin->sin_addr.s_addr == 0) {
                  /* Invalid address */
                  return (-1);
            }
            /* zero out the bzero area */
            memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));

            /* assure len is set */
            sin->sin_len = sizeof(struct sockaddr_in);
            if (set_scope) {
#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
                  stcb->ipv4_local_scope = 1;
#else
                  if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
                        stcb->asoc.ipv4_local_scope = 1;
                  }
#endif                        /* SCTP_DONT_DO_PRIVADDR_SCOPE */
            } else {
                  /* Validate the address is in scope */
                  if ((IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) &&
                      (stcb->asoc.ipv4_local_scope == 0)) {
                        addr_inscope = 0;
                  }
            }
      } else if (newaddr->sa_family == AF_INET6) {
            struct sockaddr_in6 *sin6;

            sin6 = (struct sockaddr_in6 *)newaddr;
            if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                  /* Invalid address */
                  return (-1);
            }
            /* assure len is set */
            sin6->sin6_len = sizeof(struct sockaddr_in6);
            if (set_scope) {
                  if (sctp_is_address_on_local_host(newaddr, stcb->asoc.vrf_id)) {
                        stcb->asoc.loopback_scope = 1;
                        stcb->asoc.local_scope = 0;
                        stcb->asoc.ipv4_local_scope = 1;
                        stcb->asoc.site_scope = 1;
                  } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                        /*
                         * If the new destination is a LINK_LOCAL we
                         * must have common site scope. Don't set
                         * the local scope since we may not share
                         * all links, only loopback can do this.
                         * Links on the local network would also be
                         * on our private network for v4 too.
                         */
                        stcb->asoc.ipv4_local_scope = 1;
                        stcb->asoc.site_scope = 1;
                  } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
                        /*
                         * If the new destination is SITE_LOCAL then
                         * we must have site scope in common.
                         */
                        stcb->asoc.site_scope = 1;
                  }
            } else {
                  /* Validate the address is in scope */
                  if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr) &&
                      (stcb->asoc.loopback_scope == 0)) {
                        addr_inscope = 0;
                  } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
                      (stcb->asoc.local_scope == 0)) {
                        addr_inscope = 0;
                  } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
                      (stcb->asoc.site_scope == 0)) {
                        addr_inscope = 0;
                  }
            }
      } else {
            /* not supported family type */
            return (-1);
      }
      net = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_net, struct sctp_nets);
      if (net == NULL) {
            return (-1);
      }
      SCTP_INCR_RADDR_COUNT();
      bzero(net, sizeof(*net));
      (void)SCTP_GETTIME_TIMEVAL(&net->start_time);
      memcpy(&net->ro._l_addr, newaddr, newaddr->sa_len);
      if (newaddr->sa_family == AF_INET) {
            ((struct sockaddr_in *)&net->ro._l_addr)->sin_port = stcb->rport;
      } else if (newaddr->sa_family == AF_INET6) {
            ((struct sockaddr_in6 *)&net->ro._l_addr)->sin6_port = stcb->rport;
      }
      net->addr_is_local = sctp_is_address_on_local_host(newaddr, stcb->asoc.vrf_id);
      if (net->addr_is_local && ((set_scope || (from == SCTP_ADDR_IS_CONFIRMED)))) {
            stcb->asoc.loopback_scope = 1;
            stcb->asoc.ipv4_local_scope = 1;
            stcb->asoc.local_scope = 0;
            stcb->asoc.site_scope = 1;
            addr_inscope = 1;
      }
      net->failure_threshold = stcb->asoc.def_net_failure;
      if (addr_inscope == 0) {
            net->dest_state = (SCTP_ADDR_REACHABLE |
                SCTP_ADDR_OUT_OF_SCOPE);
      } else {
            if (from == SCTP_ADDR_IS_CONFIRMED)
                  /* SCTP_ADDR_IS_CONFIRMED is passed by connect_x */
                  net->dest_state = SCTP_ADDR_REACHABLE;
            else
                  net->dest_state = SCTP_ADDR_REACHABLE |
                      SCTP_ADDR_UNCONFIRMED;
      }
      /*
       * We set this to 0, the timer code knows that this means its an
       * initial value
       */
      net->RTO = 0;
      net->RTO_measured = 0;
      stcb->asoc.numnets++;
      *(&net->ref_count) = 1;
      net->tos_flowlabel = 0;
#ifdef INET
      if (newaddr->sa_family == AF_INET)
            net->tos_flowlabel = stcb->asoc.default_tos;
#endif
#ifdef INET6
      if (newaddr->sa_family == AF_INET6)
            net->tos_flowlabel = stcb->asoc.default_flowlabel;
#endif
      /* Init the timer structure */
      SCTP_OS_TIMER_INIT(&net->rxt_timer.timer);
      SCTP_OS_TIMER_INIT(&net->fr_timer.timer);
      SCTP_OS_TIMER_INIT(&net->pmtu_timer.timer);

      /* Now generate a route for this guy */
      /* KAME hack: embed scopeid */
      if (newaddr->sa_family == AF_INET6) {
            struct sockaddr_in6 *sin6;

            sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
            (void)sa6_embedscope(sin6, ip6_use_defzone);
            sin6->sin6_scope_id = 0;
      }
      SCTP_RTALLOC((sctp_route_t *) & net->ro, stcb->asoc.vrf_id);

      if (newaddr->sa_family == AF_INET6) {
            struct sockaddr_in6 *sin6;

            sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
            (void)sa6_recoverscope(sin6);
      }
      if (SCTP_ROUTE_HAS_VALID_IFN(&net->ro)) {
            /* Get source address */
            net->ro._s_addr = sctp_source_address_selection(stcb->sctp_ep,
                stcb,
                (sctp_route_t *) & net->ro,
                net,
                0,
                stcb->asoc.vrf_id);
            /* Now get the interface MTU */
            if (net->ro._s_addr && net->ro._s_addr->ifn_p) {
                  net->mtu = SCTP_GATHER_MTU_FROM_INTFC(net->ro._s_addr->ifn_p);
            } else {
                  net->mtu = 0;
            }
#ifdef SCTP_PRINT_FOR_B_AND_M
            SCTP_PRINTF("We have found an interface mtu of %d\n", net->mtu);
#endif
            if (net->mtu == 0) {
                  /* Huh ?? */
                  net->mtu = SCTP_DEFAULT_MTU;
            } else {
                  uint32_t rmtu;

                  rmtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, net->ro.ro_rt);
#ifdef SCTP_PRINT_FOR_B_AND_M
                  SCTP_PRINTF("The route mtu is %d\n", rmtu);
#endif
                  if (rmtu == 0) {
                        /*
                         * Start things off to match mtu of
                         * interface please.
                         */
                        SCTP_SET_MTU_OF_ROUTE(&net->ro._l_addr.sa,
                            net->ro.ro_rt, net->mtu);
                  } else {
                        /*
                         * we take the route mtu over the interface,
                         * since the route may be leading out the
                         * loopback, or a different interface.
                         */
                        net->mtu = rmtu;
                  }
            }
            if (from == SCTP_ALLOC_ASOC) {
#ifdef SCTP_PRINT_FOR_B_AND_M
                  SCTP_PRINTF("New assoc sets mtu to :%d\n", net->mtu);
#endif
                  stcb->asoc.smallest_mtu = net->mtu;
            }
      } else {
            net->mtu = stcb->asoc.smallest_mtu;
      }
      if (stcb->asoc.smallest_mtu > net->mtu) {
#ifdef SCTP_PRINT_FOR_B_AND_M
            SCTP_PRINTF("new address mtu:%d smaller than smallest:%d\n",
                net->mtu, stcb->asoc.smallest_mtu);
#endif
            stcb->asoc.smallest_mtu = net->mtu;
      }
      /* JRS - Use the congestion control given in the CC module */
      stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb, net);

      /*
       * CMT: CUC algo - set find_pseudo_cumack to TRUE (1) at beginning
       * of assoc (2005/06/27, iyengar@cis.udel.edu)
       */
      net->find_pseudo_cumack = 1;
      net->find_rtx_pseudo_cumack = 1;
      net->src_addr_selected = 0;
      netfirst = TAILQ_FIRST(&stcb->asoc.nets);
      if (net->ro.ro_rt == NULL) {
            /* Since we have no route put it at the back */
            TAILQ_INSERT_TAIL(&stcb->asoc.nets, net, sctp_next);
      } else if (netfirst == NULL) {
            /* We are the first one in the pool. */
            TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
      } else if (netfirst->ro.ro_rt == NULL) {
            /*
             * First one has NO route. Place this one ahead of the first
             * one.
             */
            TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
      } else if (net->ro.ro_rt->rt_ifp != netfirst->ro.ro_rt->rt_ifp) {
            /*
             * This one has a different interface than the one at the
             * top of the list. Place it ahead.
             */
            TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
      } else {
            /*
             * Ok we have the same interface as the first one. Move
             * forward until we find either a) one with a NULL route...
             * insert ahead of that b) one with a different ifp.. insert
             * after that. c) end of the list.. insert at the tail.
             */
            struct sctp_nets *netlook;

            do {
                  netlook = TAILQ_NEXT(netfirst, sctp_next);
                  if (netlook == NULL) {
                        /* End of the list */
                        TAILQ_INSERT_TAIL(&stcb->asoc.nets, net, sctp_next);
                        break;
                  } else if (netlook->ro.ro_rt == NULL) {
                        /* next one has NO route */
                        TAILQ_INSERT_BEFORE(netfirst, net, sctp_next);
                        break;
                  } else if (netlook->ro.ro_rt->rt_ifp != net->ro.ro_rt->rt_ifp) {
                        TAILQ_INSERT_AFTER(&stcb->asoc.nets, netlook,
                            net, sctp_next);
                        break;
                  }
                  /* Shift forward */
                  netfirst = netlook;
            } while (netlook != NULL);
      }

      /* got to have a primary set */
      if (stcb->asoc.primary_destination == 0) {
            stcb->asoc.primary_destination = net;
      } else if ((stcb->asoc.primary_destination->ro.ro_rt == NULL) &&
                (net->ro.ro_rt) &&
          ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) {
            /* No route to current primary adopt new primary */
            stcb->asoc.primary_destination = net;
      }
      sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb,
          net);
      /* Validate primary is first */
      net = TAILQ_FIRST(&stcb->asoc.nets);
      if ((net != stcb->asoc.primary_destination) &&
          (stcb->asoc.primary_destination)) {
            /*
             * first one on the list is NOT the primary sctp_cmpaddr()
             * is much more efficent if the primary is the first on the
             * list, make it so.
             */
            TAILQ_REMOVE(&stcb->asoc.nets,
                stcb->asoc.primary_destination, sctp_next);
            TAILQ_INSERT_HEAD(&stcb->asoc.nets,
                stcb->asoc.primary_destination, sctp_next);
      }
      return (0);
}


/*
 * allocate an association and add it to the endpoint. The caller must be
 * careful to add all additional addresses once they are know right away or
 * else the assoc will be may experience a blackout scenario.
 */
struct sctp_tcb *
sctp_aloc_assoc(struct sctp_inpcb *inp, struct sockaddr *firstaddr,
    int for_a_init, int *error, uint32_t override_tag, uint32_t vrf_id,
    struct thread *p
)
{
      /* note the p argument is only valid in unbound sockets */

      struct sctp_tcb *stcb;
      struct sctp_association *asoc;
      struct sctpasochead *head;
      uint16_t rport;
      int err;

      /*
       * Assumption made here: Caller has done a
       * sctp_findassociation_ep_addr(ep, addr's); to make sure the
       * address does not exist already.
       */
      if (sctppcbinfo.ipi_count_asoc >= SCTP_MAX_NUM_OF_ASOC) {
            /* Hit max assoc, sorry no more */
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
            *error = ENOBUFS;
            return (NULL);
      }
      if (firstaddr == NULL) {
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
            *error = EINVAL;
            return (NULL);
      }
      SCTP_INP_RLOCK(inp);
      if (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) {
            /*
             * If its in the TCP pool, its NOT allowed to create an
             * association. The parent listener needs to call
             * sctp_aloc_assoc.. or the one-2-many socket. If a peeled
             * off, or connected one does this.. its an error.
             */
            SCTP_INP_RUNLOCK(inp);
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
            *error = EINVAL;
            return (NULL);
      }
      SCTPDBG(SCTP_DEBUG_PCB3, "Allocate an association for peer:");
#ifdef SCTP_DEBUG
      if (firstaddr) {
            SCTPDBG_ADDR(SCTP_DEBUG_PCB3, firstaddr);
            SCTPDBG(SCTP_DEBUG_PCB3, "Port:%d\n",
                ntohs(((struct sockaddr_in *)firstaddr)->sin_port));
      } else {
            SCTPDBG(SCTP_DEBUG_PCB3, "None\n");
      }
#endif                        /* SCTP_DEBUG */
      if (firstaddr->sa_family == AF_INET) {
            struct sockaddr_in *sin;

            sin = (struct sockaddr_in *)firstaddr;
            if ((sin->sin_port == 0) || (sin->sin_addr.s_addr == 0)) {
                  /* Invalid address */
                  SCTP_INP_RUNLOCK(inp);
                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
                  *error = EINVAL;
                  return (NULL);
            }
            rport = sin->sin_port;
      } else if (firstaddr->sa_family == AF_INET6) {
            struct sockaddr_in6 *sin6;

            sin6 = (struct sockaddr_in6 *)firstaddr;
            if ((sin6->sin6_port == 0) ||
                (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))) {
                  /* Invalid address */
                  SCTP_INP_RUNLOCK(inp);
                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
                  *error = EINVAL;
                  return (NULL);
            }
            rport = sin6->sin6_port;
      } else {
            /* not supported family type */
            SCTP_INP_RUNLOCK(inp);
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
            *error = EINVAL;
            return (NULL);
      }
      SCTP_INP_RUNLOCK(inp);
      if (inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) {
            /*
             * If you have not performed a bind, then we need to do the
             * ephemerial bind for you.
             */
            if ((err = sctp_inpcb_bind(inp->sctp_socket,
                (struct sockaddr *)NULL,
                (struct sctp_ifa *)NULL,
                p
                ))) {
                  /* bind error, probably perm */
                  *error = err;
                  return (NULL);
            }
      }
      stcb = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_asoc, struct sctp_tcb);
      if (stcb == NULL) {
            /* out of memory? */
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOMEM);
            *error = ENOMEM;
            return (NULL);
      }
      SCTP_INCR_ASOC_COUNT();

      bzero(stcb, sizeof(*stcb));
      asoc = &stcb->asoc;
      SCTP_TCB_LOCK_INIT(stcb);
      SCTP_TCB_SEND_LOCK_INIT(stcb);
      /* setup back pointer's */
      stcb->sctp_ep = inp;
      stcb->sctp_socket = inp->sctp_socket;
      if ((err = sctp_init_asoc(inp, stcb, for_a_init, override_tag, vrf_id))) {
            /* failed */
            SCTP_TCB_LOCK_DESTROY(stcb);
            SCTP_TCB_SEND_LOCK_DESTROY(stcb);
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
            SCTP_DECR_ASOC_COUNT();
            *error = err;
            return (NULL);
      }
      /* and the port */
      stcb->rport = rport;
      SCTP_INP_INFO_WLOCK();
      SCTP_INP_WLOCK(inp);
      if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
            /* inpcb freed while alloc going on */
            SCTP_TCB_LOCK_DESTROY(stcb);
            SCTP_TCB_SEND_LOCK_DESTROY(stcb);
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
            SCTP_INP_WUNLOCK(inp);
            SCTP_INP_INFO_WUNLOCK();
            SCTP_DECR_ASOC_COUNT();
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
            *error = EINVAL;
            return (NULL);
      }
      SCTP_TCB_LOCK(stcb);

      /* now that my_vtag is set, add it to the hash */
      head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
          sctppcbinfo.hashasocmark)];
      /* put it in the bucket in the vtag hash of assoc's for the system */
      LIST_INSERT_HEAD(head, stcb, sctp_asocs);
      sctp_delete_from_timewait(stcb->asoc.my_vtag);

      SCTP_INP_INFO_WUNLOCK();

      if ((err = sctp_add_remote_addr(stcb, firstaddr, SCTP_DO_SETSCOPE, SCTP_ALLOC_ASOC))) {
            /* failure.. memory error? */
            if (asoc->strmout) {
                  SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
                  asoc->strmout = NULL;
            }
            if (asoc->mapping_array) {
                  SCTP_FREE(asoc->mapping_array, SCTP_M_MAP);
                  asoc->mapping_array = NULL;
            }
            SCTP_DECR_ASOC_COUNT();
            SCTP_TCB_LOCK_DESTROY(stcb);
            SCTP_TCB_SEND_LOCK_DESTROY(stcb);
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
            SCTP_INP_WUNLOCK(inp);
            SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
            *error = ENOBUFS;
            return (NULL);
      }
      /* Init all the timers */
      SCTP_OS_TIMER_INIT(&asoc->hb_timer.timer);
      SCTP_OS_TIMER_INIT(&asoc->dack_timer.timer);
      SCTP_OS_TIMER_INIT(&asoc->strreset_timer.timer);
      SCTP_OS_TIMER_INIT(&asoc->asconf_timer.timer);
      SCTP_OS_TIMER_INIT(&asoc->shut_guard_timer.timer);
      SCTP_OS_TIMER_INIT(&asoc->autoclose_timer.timer);
      SCTP_OS_TIMER_INIT(&asoc->delayed_event_timer.timer);
      SCTP_OS_TIMER_INIT(&asoc->delete_prim_timer.timer);

      LIST_INSERT_HEAD(&inp->sctp_asoc_list, stcb, sctp_tcblist);
      /* now file the port under the hash as well */
      if (inp->sctp_tcbhash != NULL) {
            head = &inp->sctp_tcbhash[SCTP_PCBHASH_ALLADDR(stcb->rport,
                inp->sctp_hashmark)];
            LIST_INSERT_HEAD(head, stcb, sctp_tcbhash);
      }
      SCTP_INP_WUNLOCK(inp);
      SCTPDBG(SCTP_DEBUG_PCB1, "Association %p now allocated\n", stcb);
      return (stcb);
}


void
sctp_remove_net(struct sctp_tcb *stcb, struct sctp_nets *net)
{
      struct sctp_association *asoc;

      asoc = &stcb->asoc;
      asoc->numnets--;
      TAILQ_REMOVE(&asoc->nets, net, sctp_next);
      if (net == asoc->primary_destination) {
            /* Reset primary */
            struct sctp_nets *lnet;

            lnet = TAILQ_FIRST(&asoc->nets);
            /*
             * Mobility adaptation Ideally, if deleted destination is
             * the primary, it becomes a fast retransmission trigger by
             * the subsequent SET PRIMARY. (by micchie)
             */
            if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                SCTP_MOBILITY_BASE) ||
                sctp_is_mobility_feature_on(stcb->sctp_ep,
                SCTP_MOBILITY_FASTHANDOFF)) {
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "remove_net: primary dst is deleting\n");
                  if (asoc->deleted_primary != NULL) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "remove_net: deleted primary may be already stored\n");
                        goto leave;
                  }
                  asoc->deleted_primary = net;
                  atomic_add_int(&net->ref_count, 1);
                  memset(&net->lastsa, 0, sizeof(net->lastsa));
                  memset(&net->lastsv, 0, sizeof(net->lastsv));
                  sctp_mobility_feature_on(stcb->sctp_ep,
                      SCTP_MOBILITY_PRIM_DELETED);
                  sctp_timer_start(SCTP_TIMER_TYPE_PRIM_DELETED,
                      stcb->sctp_ep, stcb, NULL);
            }
leave:
            /* Try to find a confirmed primary */
            asoc->primary_destination = sctp_find_alternate_net(stcb, lnet, 0);
      }
      if (net == asoc->last_data_chunk_from) {
            /* Reset primary */
            asoc->last_data_chunk_from = TAILQ_FIRST(&asoc->nets);
      }
      if (net == asoc->last_control_chunk_from) {
            /* Clear net */
            asoc->last_control_chunk_from = NULL;
      }
      sctp_free_remote_addr(net);
}

/*
 * remove a remote endpoint address from an association, it will fail if the
 * address does not exist.
 */
int
sctp_del_remote_addr(struct sctp_tcb *stcb, struct sockaddr *remaddr)
{
      /*
       * Here we need to remove a remote address. This is quite simple, we
       * first find it in the list of address for the association
       * (tasoc->asoc.nets) and then if it is there, we do a LIST_REMOVE
       * on that item. Note we do not allow it to be removed if there are
       * no other addresses.
       */
      struct sctp_association *asoc;
      struct sctp_nets *net, *net_tmp;

      asoc = &stcb->asoc;

      /* locate the address */
      for (net = TAILQ_FIRST(&asoc->nets); net != NULL; net = net_tmp) {
            net_tmp = TAILQ_NEXT(net, sctp_next);
            if (net->ro._l_addr.sa.sa_family != remaddr->sa_family) {
                  continue;
            }
            if (sctp_cmpaddr((struct sockaddr *)&net->ro._l_addr,
                remaddr)) {
                  /* we found the guy */
                  if (asoc->numnets < 2) {
                        /* Must have at LEAST two remote addresses */
                        return (-1);
                  } else {
                        sctp_remove_net(stcb, net);
                        return (0);
                  }
            }
      }
      /* not found. */
      return (-2);
}

void
sctp_delete_from_timewait(uint32_t tag)
{
      struct sctpvtaghead *chain;
      struct sctp_tagblock *twait_block;
      int found = 0;
      int i;

      chain = &sctppcbinfo.vtag_timewait[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
      if (!SCTP_LIST_EMPTY(chain)) {
            LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
                  for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
                        if (twait_block->vtag_block[i].v_tag == tag) {
                              twait_block->vtag_block[i].tv_sec_at_expire = 0;
                              twait_block->vtag_block[i].v_tag = 0;
                              found = 1;
                              break;
                        }
                  }
                  if (found)
                        break;
            }
      }
}

int
sctp_is_in_timewait(uint32_t tag)
{
      struct sctpvtaghead *chain;
      struct sctp_tagblock *twait_block;
      int found = 0;
      int i;

      chain = &sctppcbinfo.vtag_timewait[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
      if (!SCTP_LIST_EMPTY(chain)) {
            LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
                  for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
                        if (twait_block->vtag_block[i].v_tag == tag) {
                              found = 1;
                              break;
                        }
                  }
                  if (found)
                        break;
            }
      }
      return (found);
}


void
sctp_add_vtag_to_timewait(uint32_t tag, uint32_t time)
{
      struct sctpvtaghead *chain;
      struct sctp_tagblock *twait_block;
      struct timeval now;
      int set, i;

      (void)SCTP_GETTIME_TIMEVAL(&now);
      chain = &sctppcbinfo.vtag_timewait[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
      set = 0;
      if (!SCTP_LIST_EMPTY(chain)) {
            /* Block(s) present, lets find space, and expire on the fly */
            LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
                  for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
                        if ((twait_block->vtag_block[i].v_tag == 0) &&
                            !set) {
                              twait_block->vtag_block[i].tv_sec_at_expire =
                                  now.tv_sec + time;
                              twait_block->vtag_block[i].v_tag = tag;
                              set = 1;
                        } else if ((twait_block->vtag_block[i].v_tag) &&
                            ((long)twait_block->vtag_block[i].tv_sec_at_expire < now.tv_sec)) {
                              /* Audit expires this guy */
                              twait_block->vtag_block[i].tv_sec_at_expire = 0;
                              twait_block->vtag_block[i].v_tag = 0;
                              if (set == 0) {
                                    /* Reuse it for my new tag */
                                    twait_block->vtag_block[0].tv_sec_at_expire = now.tv_sec + time;
                                    twait_block->vtag_block[0].v_tag = tag;
                                    set = 1;
                              }
                        }
                  }
                  if (set) {
                        /*
                         * We only do up to the block where we can
                         * place our tag for audits
                         */
                        break;
                  }
            }
      }
      /* Need to add a new block to chain */
      if (!set) {
            SCTP_MALLOC(twait_block, struct sctp_tagblock *,
                sizeof(struct sctp_tagblock), SCTP_M_TIMW);
            if (twait_block == NULL) {
                  return;
            }
            memset(twait_block, 0, sizeof(struct sctp_tagblock));
            LIST_INSERT_HEAD(chain, twait_block, sctp_nxt_tagblock);
            twait_block->vtag_block[0].tv_sec_at_expire = now.tv_sec + time;
            twait_block->vtag_block[0].v_tag = tag;
      }
}


static void
sctp_iterator_asoc_being_freed(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
      struct sctp_iterator *it;

      /*
       * Unlock the tcb lock we do this so we avoid a dead lock scenario
       * where the iterator is waiting on the TCB lock and the TCB lock is
       * waiting on the iterator lock.
       */
      it = stcb->asoc.stcb_starting_point_for_iterator;
      if (it == NULL) {
            return;
      }
      if (it->inp != stcb->sctp_ep) {
            /* hmm, focused on the wrong one? */
            return;
      }
      if (it->stcb != stcb) {
            return;
      }
      it->stcb = LIST_NEXT(stcb, sctp_tcblist);
      if (it->stcb == NULL) {
            /* done with all asoc's in this assoc */
            if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
                  it->inp = NULL;
            } else {
                  it->inp = LIST_NEXT(inp, sctp_list);
            }
      }
}


/*-
 * Free the association after un-hashing the remote port. This
 * function ALWAYS returns holding NO LOCK on the stcb. It DOES
 * expect that the input to this function IS a locked TCB.
 * It will return 0, if it did NOT destroy the association (instead
 * it unlocks it. It will return NON-zero if it either destroyed the
 * association OR the association is already destroyed.
 */
int
sctp_free_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int from_inpcbfree, int from_location)
{
      int i;
      struct sctp_association *asoc;
      struct sctp_nets *net, *prev;
      struct sctp_laddr *laddr;
      struct sctp_tmit_chunk *chk;
      struct sctp_asconf_addr *aparam;
      struct sctp_asconf_ack *aack;
      struct sctp_stream_reset_list *liste;
      struct sctp_queued_to_read *sq;
      struct sctp_stream_queue_pending *sp;
      sctp_sharedkey_t *shared_key;
      struct socket *so;
      int ccnt = 0;
      int cnt = 0;

      /* first, lets purge the entry from the hash table. */

#ifdef SCTP_LOG_CLOSING
      sctp_log_closing(inp, stcb, 6);
#endif
      if (stcb->asoc.state == 0) {
#ifdef SCTP_LOG_CLOSING
            sctp_log_closing(inp, NULL, 7);
#endif
            /* there is no asoc, really TSNH :-0 */
            return (1);
      }
      /* TEMP CODE */
      if (stcb->freed_from_where == 0) {
            /* Only record the first place free happened from */
            stcb->freed_from_where = from_location;
      }
      /* TEMP CODE */

      asoc = &stcb->asoc;
      if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
          (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE))
            /* nothing around */
            so = NULL;
      else
            so = inp->sctp_socket;

      /*
       * We used timer based freeing if a reader or writer is in the way.
       * So we first check if we are actually being called from a timer,
       * if so we abort early if a reader or writer is still in the way.
       */
      if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) &&
          (from_inpcbfree == SCTP_NORMAL_PROC)) {
            /*
             * is it the timer driving us? if so are the reader/writers
             * gone?
             */
            if (stcb->asoc.refcnt) {
                  /* nope, reader or writer in the way */
                  sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, stcb, NULL);
                  /* no asoc destroyed */
                  SCTP_TCB_UNLOCK(stcb);
#ifdef SCTP_LOG_CLOSING
                  sctp_log_closing(inp, stcb, 8);
#endif
                  return (0);
            }
      }
      /* now clean up any other timers */
      (void)SCTP_OS_TIMER_STOP(&asoc->hb_timer.timer);
      asoc->hb_timer.self = NULL;
      (void)SCTP_OS_TIMER_STOP(&asoc->dack_timer.timer);
      asoc->dack_timer.self = NULL;
      (void)SCTP_OS_TIMER_STOP(&asoc->strreset_timer.timer);
      /*-
       * For stream reset we don't blast this unless
       * it is a str-reset timer, it might be the
       * free-asoc timer which we DON'T want to
       * disturb.
       */
      if (asoc->strreset_timer.type == SCTP_TIMER_TYPE_STRRESET)
            asoc->strreset_timer.self = NULL;
      (void)SCTP_OS_TIMER_STOP(&asoc->asconf_timer.timer);
      asoc->asconf_timer.self = NULL;
      (void)SCTP_OS_TIMER_STOP(&asoc->autoclose_timer.timer);
      asoc->autoclose_timer.self = NULL;
      (void)SCTP_OS_TIMER_STOP(&asoc->shut_guard_timer.timer);
      asoc->shut_guard_timer.self = NULL;
      (void)SCTP_OS_TIMER_STOP(&asoc->delayed_event_timer.timer);
      asoc->delayed_event_timer.self = NULL;
      /* Mobility adaptation */
      (void)SCTP_OS_TIMER_STOP(&asoc->delete_prim_timer.timer);
      asoc->delete_prim_timer.self = NULL;
      TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
            (void)SCTP_OS_TIMER_STOP(&net->fr_timer.timer);
            net->fr_timer.self = NULL;
            (void)SCTP_OS_TIMER_STOP(&net->rxt_timer.timer);
            net->rxt_timer.self = NULL;
            (void)SCTP_OS_TIMER_STOP(&net->pmtu_timer.timer);
            net->pmtu_timer.self = NULL;
      }
      /* Now the read queue needs to be cleaned up (only once) */
      cnt = 0;
      if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) {
            stcb->asoc.state |= SCTP_STATE_ABOUT_TO_BE_FREED;
            SCTP_INP_READ_LOCK(inp);
            TAILQ_FOREACH(sq, &inp->read_queue, next) {
                  if (sq->stcb == stcb) {
                        sq->do_not_ref_stcb = 1;
                        sq->sinfo_cumtsn = stcb->asoc.cumulative_tsn;
                        /*
                         * If there is no end, there never will be
                         * now.
                         */
                        if (sq->end_added == 0) {
                              /* Held for PD-API clear that. */
                              sq->pdapi_aborted = 1;
                              sq->held_length = 0;
                              if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_PDAPIEVNT) && (so != NULL)) {
                                    /*
                                     * Need to add a PD-API
                                     * aborted indication.
                                     * Setting the control_pdapi
                                     * assures that it will be
                                     * added right after this
                                     * msg.
                                     */
                                    uint32_t strseq;

                                    stcb->asoc.control_pdapi = sq;
                                    strseq = (sq->sinfo_stream << 16) | sq->sinfo_ssn;
                                    sctp_notify_partial_delivery_indication(stcb,
                                        SCTP_PARTIAL_DELIVERY_ABORTED, 1, strseq);
                                    stcb->asoc.control_pdapi = NULL;
                              }
                        }
                        /* Add an end to wake them */
                        sq->end_added = 1;
                        cnt++;
                  }
            }
            SCTP_INP_READ_UNLOCK(inp);
            if (stcb->block_entry) {
                  cnt++;
                  SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PCB, ECONNRESET);
                  stcb->block_entry->error = ECONNRESET;
                  stcb->block_entry = NULL;
            }
      }
      if (stcb->asoc.refcnt) {
            /*
             * reader or writer in the way, we have hopefully given him
             * something to chew on above.
             */
            sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, stcb, NULL);
            SCTP_TCB_UNLOCK(stcb);
            if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
                (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE))
                  /* nothing around */
                  so = NULL;
            if (so) {
                  /* Wake any reader/writers */
                  sctp_sorwakeup(inp, so);
                  sctp_sowwakeup(inp, so);
            }
#ifdef SCTP_LOG_CLOSING
            sctp_log_closing(inp, stcb, 9);
#endif
            /* no asoc destroyed */
            return (0);
      }
#ifdef SCTP_LOG_CLOSING
      sctp_log_closing(inp, stcb, 10);
#endif
      /*
       * When I reach here, no others want to kill the assoc yet.. and I
       * own the lock. Now its possible an abort comes in when I do the
       * lock exchange below to grab all the locks to do the final take
       * out. to prevent this we increment the count, which will start a
       * timer and blow out above thus assuring us that we hold exclusive
       * killing of the asoc. Note that after getting back the TCB lock we
       * will go ahead and increment the counter back up and stop any
       * timer a passing stranger may have started :-S
       */
      if (from_inpcbfree == SCTP_NORMAL_PROC) {
            atomic_add_int(&stcb->asoc.refcnt, 1);

            SCTP_TCB_UNLOCK(stcb);

            SCTP_ITERATOR_LOCK();
            SCTP_INP_INFO_WLOCK();
            SCTP_INP_WLOCK(inp);
            SCTP_TCB_LOCK(stcb);
      }
      /* Double check the GONE flag */
      if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
          (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE))
            /* nothing around */
            so = NULL;

      if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
          (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
            /*
             * For TCP type we need special handling when we are
             * connected. We also include the peel'ed off ones to.
             */
            if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
                  inp->sctp_flags &= ~SCTP_PCB_FLAGS_CONNECTED;
                  inp->sctp_flags |= SCTP_PCB_FLAGS_WAS_CONNECTED;
                  if (so) {
                        SOCK_LOCK(so);
                        if (so->so_rcv.sb_cc == 0) {
                              so->so_state &= ~(SS_ISCONNECTING |
                                  SS_ISDISCONNECTING |
                                  SS_ISCONFIRMING |
                                  SS_ISCONNECTED);
                        }
                        SOCK_UNLOCK(so);
                        socantrcvmore(so);
                        sctp_sowwakeup(inp, so);
                        sctp_sorwakeup(inp, so);
                        SCTP_SOWAKEUP(so);
                  }
            }
      }
      /*
       * Make it invalid too, that way if its about to run it will abort
       * and return.
       */
      sctp_iterator_asoc_being_freed(inp, stcb);
      /* re-increment the lock */
      if (from_inpcbfree == SCTP_NORMAL_PROC) {
            atomic_add_int(&stcb->asoc.refcnt, -1);
      }
      asoc->state = 0;
      if (inp->sctp_tcbhash) {
            LIST_REMOVE(stcb, sctp_tcbhash);
      }
      if (stcb->asoc.in_restart_hash) {
            LIST_REMOVE(stcb, sctp_tcbrestarhash);
      }
      /* Now lets remove it from the list of ALL associations in the EP */
      LIST_REMOVE(stcb, sctp_tcblist);
      if (from_inpcbfree == SCTP_NORMAL_PROC) {
            SCTP_INP_INCR_REF(inp);
            SCTP_INP_WUNLOCK(inp);
            SCTP_ITERATOR_UNLOCK();
      }
      /* pull from vtag hash */
      LIST_REMOVE(stcb, sctp_asocs);
      sctp_add_vtag_to_timewait(asoc->my_vtag, SCTP_TIME_WAIT);

      /*
       * Now restop the timers to be sure - this is paranoia at is finest!
       */
      (void)SCTP_OS_TIMER_STOP(&asoc->strreset_timer.timer);
      (void)SCTP_OS_TIMER_STOP(&asoc->hb_timer.timer);
      (void)SCTP_OS_TIMER_STOP(&asoc->dack_timer.timer);
      (void)SCTP_OS_TIMER_STOP(&asoc->strreset_timer.timer);
      (void)SCTP_OS_TIMER_STOP(&asoc->asconf_timer.timer);
      (void)SCTP_OS_TIMER_STOP(&asoc->shut_guard_timer.timer);
      (void)SCTP_OS_TIMER_STOP(&asoc->autoclose_timer.timer);
      (void)SCTP_OS_TIMER_STOP(&asoc->delayed_event_timer.timer);
      TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
            (void)SCTP_OS_TIMER_STOP(&net->fr_timer.timer);
            (void)SCTP_OS_TIMER_STOP(&net->rxt_timer.timer);
            (void)SCTP_OS_TIMER_STOP(&net->pmtu_timer.timer);
      }

      asoc->strreset_timer.type = SCTP_TIMER_TYPE_NONE;
      prev = NULL;
      /*
       * The chunk lists and such SHOULD be empty but we check them just
       * in case.
       */
      /* anything on the wheel needs to be removed */
      for (i = 0; i < asoc->streamoutcnt; i++) {
            struct sctp_stream_out *outs;

            outs = &asoc->strmout[i];
            /* now clean up any chunks here */
            sp = TAILQ_FIRST(&outs->outqueue);
            while (sp) {
                  TAILQ_REMOVE(&outs->outqueue, sp, next);
                  if (sp->data) {
                        sctp_m_freem(sp->data);
                        sp->data = NULL;
                        sp->tail_mbuf = NULL;
                  }
                  sctp_free_remote_addr(sp->net);
                  sctp_free_spbufspace(stcb, asoc, sp);
                  /* Free the zone stuff  */
                  SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_strmoq, sp);
                  SCTP_DECR_STRMOQ_COUNT();
                  /* sa_ignore FREED_MEMORY */
                  sp = TAILQ_FIRST(&outs->outqueue);
            }
      }

      /* sa_ignore FREED_MEMORY */
      while ((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) {
            TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
            SCTP_FREE(liste, SCTP_M_STRESET);
      }

      sq = TAILQ_FIRST(&asoc->pending_reply_queue);
      while (sq) {
            TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
            if (sq->data) {
                  sctp_m_freem(sq->data);
                  sq->data = NULL;
            }
            sctp_free_remote_addr(sq->whoFrom);
            sq->whoFrom = NULL;
            sq->stcb = NULL;
            /* Free the ctl entry */
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_readq, sq);
            SCTP_DECR_READQ_COUNT();
            /* sa_ignore FREED_MEMORY */
            sq = TAILQ_FIRST(&asoc->pending_reply_queue);
      }

      chk = TAILQ_FIRST(&asoc->free_chunks);
      while (chk) {
            TAILQ_REMOVE(&asoc->free_chunks, chk, sctp_next);
            if (chk->data) {
                  sctp_m_freem(chk->data);
                  chk->data = NULL;
            }
            ccnt++;
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
            SCTP_DECR_CHK_COUNT();
            atomic_subtract_int(&sctppcbinfo.ipi_free_chunks, 1);
            asoc->free_chunk_cnt--;
            /* sa_ignore FREED_MEMORY */
            chk = TAILQ_FIRST(&asoc->free_chunks);
      }
      /* pending send queue SHOULD be empty */
      if (!TAILQ_EMPTY(&asoc->send_queue)) {
            chk = TAILQ_FIRST(&asoc->send_queue);
            while (chk) {
                  TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
                  if (chk->data) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  ccnt++;
                  sctp_free_remote_addr(chk->whoTo);
                  SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                  SCTP_DECR_CHK_COUNT();
                  /* sa_ignore FREED_MEMORY */
                  chk = TAILQ_FIRST(&asoc->send_queue);
            }
      }
/*
  if(ccnt) {
  printf("Freed %d from send_queue\n", ccnt);
  ccnt = 0;
  }
*/
      /* sent queue SHOULD be empty */
      if (!TAILQ_EMPTY(&asoc->sent_queue)) {
            chk = TAILQ_FIRST(&asoc->sent_queue);
            while (chk) {
                  TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
                  if (chk->data) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  ccnt++;
                  sctp_free_remote_addr(chk->whoTo);
                  SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                  SCTP_DECR_CHK_COUNT();
                  /* sa_ignore FREED_MEMORY */
                  chk = TAILQ_FIRST(&asoc->sent_queue);
            }
      }
/*
  if(ccnt) {
  printf("Freed %d from sent_queue\n", ccnt);
  ccnt = 0;
  }
*/
      /* control queue MAY not be empty */
      if (!TAILQ_EMPTY(&asoc->control_send_queue)) {
            chk = TAILQ_FIRST(&asoc->control_send_queue);
            while (chk) {
                  TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
                  if (chk->data) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  ccnt++;
                  sctp_free_remote_addr(chk->whoTo);
                  SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                  SCTP_DECR_CHK_COUNT();
                  /* sa_ignore FREED_MEMORY */
                  chk = TAILQ_FIRST(&asoc->control_send_queue);
            }
      }
/*
  if(ccnt) {
  printf("Freed %d from ctrl_queue\n", ccnt);
  ccnt = 0;
  }
*/
      if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
            chk = TAILQ_FIRST(&asoc->reasmqueue);
            while (chk) {
                  TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
                  if (chk->data) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  sctp_free_remote_addr(chk->whoTo);
                  ccnt++;
                  SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                  SCTP_DECR_CHK_COUNT();
                  /* sa_ignore FREED_MEMORY */
                  chk = TAILQ_FIRST(&asoc->reasmqueue);
            }
      }
/*
  if(ccnt) {
  printf("Freed %d from reasm_queue\n", ccnt);
  ccnt = 0;
  }
*/
      if (asoc->mapping_array) {
            SCTP_FREE(asoc->mapping_array, SCTP_M_MAP);
            asoc->mapping_array = NULL;
      }
      /* the stream outs */
      if (asoc->strmout) {
            SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
            asoc->strmout = NULL;
      }
      asoc->streamoutcnt = 0;
      if (asoc->strmin) {
            struct sctp_queued_to_read *ctl;

            for (i = 0; i < asoc->streamincnt; i++) {
                  if (!TAILQ_EMPTY(&asoc->strmin[i].inqueue)) {
                        /* We have somethings on the streamin queue */
                        ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue);
                        while (ctl) {
                              TAILQ_REMOVE(&asoc->strmin[i].inqueue,
                                  ctl, next);
                              sctp_free_remote_addr(ctl->whoFrom);
                              if (ctl->data) {
                                    sctp_m_freem(ctl->data);
                                    ctl->data = NULL;
                              }
                              /*
                               * We don't free the address here
                               * since all the net's were freed
                               * above.
                               */
                              SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_readq, ctl);
                              SCTP_DECR_READQ_COUNT();
                              ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue);
                        }
                  }
            }
            SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
            asoc->strmin = NULL;
      }
      asoc->streamincnt = 0;
      while (!TAILQ_EMPTY(&asoc->nets)) {
            /* sa_ignore FREED_MEMORY */
            net = TAILQ_FIRST(&asoc->nets);
            /* pull from list */
            if ((sctppcbinfo.ipi_count_raddr == 0) || (prev == net)) {
#ifdef INVARIANTS
                  panic("no net's left alloc'ed, or list points to itself");
#endif
                  break;
            }
            prev = net;
            TAILQ_REMOVE(&asoc->nets, net, sctp_next);
            sctp_free_remote_addr(net);
      }

      while (!SCTP_LIST_EMPTY(&asoc->sctp_restricted_addrs)) {
            /* sa_ignore FREED_MEMORY */
            laddr = LIST_FIRST(&asoc->sctp_restricted_addrs);
            sctp_remove_laddr(laddr);
      }

      /* pending asconf (address) parameters */
      while (!TAILQ_EMPTY(&asoc->asconf_queue)) {
            /* sa_ignore FREED_MEMORY */
            aparam = TAILQ_FIRST(&asoc->asconf_queue);
            TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
            SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
      }
      while (!TAILQ_EMPTY(&asoc->asconf_ack_sent)) {
            /* sa_ignore FREED_MEMORY */
            aack = TAILQ_FIRST(&asoc->asconf_ack_sent);
            TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
            if (aack->data != NULL) {
                  sctp_m_freem(aack->data);
            }
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asconf_ack, aack);
      }
      /* clean up auth stuff */
      if (asoc->local_hmacs)
            sctp_free_hmaclist(asoc->local_hmacs);
      if (asoc->peer_hmacs)
            sctp_free_hmaclist(asoc->peer_hmacs);

      if (asoc->local_auth_chunks)
            sctp_free_chunklist(asoc->local_auth_chunks);
      if (asoc->peer_auth_chunks)
            sctp_free_chunklist(asoc->peer_auth_chunks);

      sctp_free_authinfo(&asoc->authinfo);

      shared_key = LIST_FIRST(&asoc->shared_keys);
      while (shared_key) {
            LIST_REMOVE(shared_key, next);
            sctp_free_sharedkey(shared_key);
            /* sa_ignore FREED_MEMORY */
            shared_key = LIST_FIRST(&asoc->shared_keys);
      }

      /* Insert new items here :> */

      /* Get rid of LOCK */
      SCTP_TCB_LOCK_DESTROY(stcb);
      SCTP_TCB_SEND_LOCK_DESTROY(stcb);
      if (from_inpcbfree == SCTP_NORMAL_PROC) {
            SCTP_INP_INFO_WUNLOCK();
            SCTP_INP_RLOCK(inp);
      }
#ifdef SCTP_TRACK_FREED_ASOCS
      if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
            /* now clean up the tasoc itself */
            SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
            SCTP_DECR_ASOC_COUNT();
      } else {
            LIST_INSERT_HEAD(&inp->sctp_asoc_free_list, stcb, sctp_tcblist);
      }
#else
      SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
      SCTP_DECR_ASOC_COUNT();
#endif
      if (from_inpcbfree == SCTP_NORMAL_PROC) {
            if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
                  /*
                   * If its NOT the inp_free calling us AND sctp_close
                   * as been called, we call back...
                   */
                  SCTP_INP_RUNLOCK(inp);
                  /*
                   * This will start the kill timer (if we are the
                   * lastone) since we hold an increment yet. But this
                   * is the only safe way to do this since otherwise
                   * if the socket closes at the same time we are here
                   * we might collide in the cleanup.
                   */
                  sctp_inpcb_free(inp,
                      SCTP_FREE_SHOULD_USE_GRACEFUL_CLOSE,
                      SCTP_CALLED_DIRECTLY_NOCMPSET);
                  SCTP_INP_DECR_REF(inp);
                  goto out_of;
            } else {
                  /* The socket is still open. */
                  SCTP_INP_DECR_REF(inp);
            }
      }
      if (from_inpcbfree == SCTP_NORMAL_PROC) {
            SCTP_INP_RUNLOCK(inp);
      }
out_of:
      /* destroyed the asoc */
#ifdef SCTP_LOG_CLOSING
      sctp_log_closing(inp, NULL, 11);
#endif
      return (1);
}



/*
 * determine if a destination is "reachable" based upon the addresses bound
 * to the current endpoint (e.g. only v4 or v6 currently bound)
 */
/*
 * FIX: if we allow assoc-level bindx(), then this needs to be fixed to use
 * assoc level v4/v6 flags, as the assoc *may* not have the same address
 * types bound as its endpoint
 */
int
sctp_destination_is_reachable(struct sctp_tcb *stcb, struct sockaddr *destaddr)
{
      struct sctp_inpcb *inp;
      int answer;

      /*
       * No locks here, the TCB, in all cases is already locked and an
       * assoc is up. There is either a INP lock by the caller applied (in
       * asconf case when deleting an address) or NOT in the HB case,
       * however if HB then the INP increment is up and the INP will not
       * be removed (on top of the fact that we have a TCB lock). So we
       * only want to read the sctp_flags, which is either bound-all or
       * not.. no protection needed since once an assoc is up you can't be
       * changing your binding.
       */
      inp = stcb->sctp_ep;
      if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
            /* if bound all, destination is not restricted */
            /*
             * RRS: Question during lock work: Is this correct? If you
             * are bound-all you still might need to obey the V4--V6
             * flags??? IMO this bound-all stuff needs to be removed!
             */
            return (1);
      }
      /* NOTE: all "scope" checks are done when local addresses are added */
      if (destaddr->sa_family == AF_INET6) {
            answer = inp->ip_inp.inp.inp_vflag & INP_IPV6;
      } else if (destaddr->sa_family == AF_INET) {
            answer = inp->ip_inp.inp.inp_vflag & INP_IPV4;
      } else {
            /* invalid family, so it's unreachable */
            answer = 0;
      }
      return (answer);
}

/*
 * update the inp_vflags on an endpoint
 */
static void
sctp_update_ep_vflag(struct sctp_inpcb *inp)
{
      struct sctp_laddr *laddr;

      /* first clear the flag */
      inp->ip_inp.inp.inp_vflag = 0;
      /* set the flag based on addresses on the ep list */
      LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
            if (laddr->ifa == NULL) {
                  SCTPDBG(SCTP_DEBUG_PCB1, "%s: NULL ifa\n",
                      __FUNCTION__);
                  continue;
            }
            if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
                  continue;
            }
            if (laddr->ifa->address.sa.sa_family == AF_INET6) {
                  inp->ip_inp.inp.inp_vflag |= INP_IPV6;
            } else if (laddr->ifa->address.sa.sa_family == AF_INET) {
                  inp->ip_inp.inp.inp_vflag |= INP_IPV4;
            }
      }
}

/*
 * Add the address to the endpoint local address list There is nothing to be
 * done if we are bound to all addresses
 */
void
sctp_add_local_addr_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa, uint32_t action)
{
      struct sctp_laddr *laddr;
      int fnd, error = 0;

      fnd = 0;

      if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
            /* You are already bound to all. You have it already */
            return;
      }
      if (ifa->address.sa.sa_family == AF_INET6) {
            if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                  /* Can't bind a non-useable addr. */
                  return;
            }
      }
      /* first, is it already present? */
      LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
            if (laddr->ifa == ifa) {
                  fnd = 1;
                  break;
            }
      }

      if (fnd == 0) {
            /* Not in the ep list */
            error = sctp_insert_laddr(&inp->sctp_addr_list, ifa, action);
            if (error != 0)
                  return;
            inp->laddr_count++;
            /* update inp_vflag flags */
            if (ifa->address.sa.sa_family == AF_INET6) {
                  inp->ip_inp.inp.inp_vflag |= INP_IPV6;
            } else if (ifa->address.sa.sa_family == AF_INET) {
                  inp->ip_inp.inp.inp_vflag |= INP_IPV4;
            }
      }
      return;
}


/*
 * select a new (hopefully reachable) destination net (should only be used
 * when we deleted an ep addr that is the only usable source address to reach
 * the destination net)
 */
static void
sctp_select_primary_destination(struct sctp_tcb *stcb)
{
      struct sctp_nets *net;

      TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
            /* for now, we'll just pick the first reachable one we find */
            if (net->dest_state & SCTP_ADDR_UNCONFIRMED)
                  continue;
            if (sctp_destination_is_reachable(stcb,
                (struct sockaddr *)&net->ro._l_addr)) {
                  /* found a reachable destination */
                  stcb->asoc.primary_destination = net;
            }
      }
      /* I can't there from here! ...we're gonna die shortly... */
}


/*
 * Delete the address from the endpoint local address list There is nothing
 * to be done if we are bound to all addresses
 */
void
sctp_del_local_addr_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
{
      struct sctp_laddr *laddr;
      int fnd;

      fnd = 0;
      if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
            /* You are already bound to all. You have it already */
            return;
      }
      LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
            if (laddr->ifa == ifa) {
                  fnd = 1;
                  break;
            }
      }
      if (fnd && (inp->laddr_count < 2)) {
            /* can't delete unless there are at LEAST 2 addresses */
            return;
      }
      if (fnd) {
            /*
             * clean up any use of this address go through our
             * associations and clear any last_used_address that match
             * this one for each assoc, see if a new primary_destination
             * is needed
             */
            struct sctp_tcb *stcb;

            /* clean up "next_addr_touse" */
            if (inp->next_addr_touse == laddr)
                  /* delete this address */
                  inp->next_addr_touse = NULL;

            /* clean up "last_used_address" */
            LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                  struct sctp_nets *net;

                  SCTP_TCB_LOCK(stcb);
                  if (stcb->asoc.last_used_address == laddr)
                        /* delete this address */
                        stcb->asoc.last_used_address = NULL;
                  /*
                   * Now spin through all the nets and purge any ref
                   * to laddr
                   */
                  TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                        if (net->ro._s_addr &&
                            (net->ro._s_addr->ifa == laddr->ifa)) {
                              /* Yep, purge src address selected */
                              sctp_rtentry_t *rt;

                              /* delete this address if cached */
                              rt = net->ro.ro_rt;
                              if (rt != NULL) {
                                    RTFREE(rt);
                                    net->ro.ro_rt = NULL;
                              }
                              sctp_free_ifa(net->ro._s_addr);
                              net->ro._s_addr = NULL;
                              net->src_addr_selected = 0;
                        }
                  }
                  SCTP_TCB_UNLOCK(stcb);
            }           /* for each tcb */
            /* remove it from the ep list */
            sctp_remove_laddr(laddr);
            inp->laddr_count--;
            /* update inp_vflag flags */
            sctp_update_ep_vflag(inp);
      }
      return;
}

/*
 * Add the address to the TCB local address restricted list.
 * This is a "pending" address list (eg. addresses waiting for an
 * ASCONF-ACK response) and cannot be used as a valid source address.
 */
void
sctp_add_local_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
{
      struct sctp_inpcb *inp;
      struct sctp_laddr *laddr;
      struct sctpladdr *list;

      /*
       * Assumes TCB is locked.. and possibly the INP. May need to
       * confirm/fix that if we need it and is not the case.
       */
      list = &stcb->asoc.sctp_restricted_addrs;

      inp = stcb->sctp_ep;
      if (ifa->address.sa.sa_family == AF_INET6) {
            if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                  /* Can't bind a non-existent addr. */
                  return;
            }
      }
      /* does the address already exist? */
      LIST_FOREACH(laddr, list, sctp_nxt_addr) {
            if (laddr->ifa == ifa) {
                  return;
            }
      }

      /* add to the list */
      (void)sctp_insert_laddr(list, ifa, 0);
      return;
}

/*
 * insert an laddr entry with the given ifa for the desired list
 */
int
sctp_insert_laddr(struct sctpladdr *list, struct sctp_ifa *ifa, uint32_t act)
{
      struct sctp_laddr *laddr;

      laddr = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_laddr, struct sctp_laddr);
      if (laddr == NULL) {
            /* out of memory? */
            SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
            return (EINVAL);
      }
      SCTP_INCR_LADDR_COUNT();
      bzero(laddr, sizeof(*laddr));
      (void)SCTP_GETTIME_TIMEVAL(&laddr->start_time);
      laddr->ifa = ifa;
      laddr->action = act;
      atomic_add_int(&ifa->refcount, 1);
      /* insert it */
      LIST_INSERT_HEAD(list, laddr, sctp_nxt_addr);

      return (0);
}

/*
 * Remove an laddr entry from the local address list (on an assoc)
 */
void
sctp_remove_laddr(struct sctp_laddr *laddr)
{

      /* remove from the list */
      LIST_REMOVE(laddr, sctp_nxt_addr);
      sctp_free_ifa(laddr->ifa);
      SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_laddr, laddr);
      SCTP_DECR_LADDR_COUNT();
}

/*
 * Remove a local address from the TCB local address restricted list
 */
void
sctp_del_local_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
{
      struct sctp_inpcb *inp;
      struct sctp_laddr *laddr;

      /*
       * This is called by asconf work. It is assumed that a) The TCB is
       * locked and b) The INP is locked. This is true in as much as I can
       * trace through the entry asconf code where I did these locks.
       * Again, the ASCONF code is a bit different in that it does lock
       * the INP during its work often times. This must be since we don't
       * want other proc's looking up things while what they are looking
       * up is changing :-D
       */

      inp = stcb->sctp_ep;
      /* if subset bound and don't allow ASCONF's, can't delete last */
      if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) &&
          sctp_is_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
            if (stcb->sctp_ep->laddr_count < 2) {
                  /* can't delete last address */
                  return;
            }
      }
      LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
            /* remove the address if it exists */
            if (laddr->ifa == NULL)
                  continue;
            if (laddr->ifa == ifa) {
                  sctp_remove_laddr(laddr);
                  return;
            }
      }

      /* address not found! */
      return;
}

static char sctp_pcb_initialized = 0;

/*
 * Temporarily remove for __APPLE__ until we use the Tiger equivalents
 */
/* sysctl */
static int sctp_max_number_of_assoc = SCTP_MAX_NUM_OF_ASOC;
static int sctp_scale_up_for_address = SCTP_SCALE_FOR_ADDR;

void
sctp_pcb_init()
{
      /*
       * SCTP initialization for the PCB structures should be called by
       * the sctp_init() funciton.
       */
      int i;
      struct timeval tv;

      if (sctp_pcb_initialized != 0) {
            /* error I was called twice */
            return;
      }
      sctp_pcb_initialized = 1;

      bzero(&sctpstat, sizeof(struct sctpstat));
#if defined(SCTP_LOCAL_TRACE_BUF)
      bzero(&sctp_log, sizeof(struct sctp_log));
#endif
      (void)SCTP_GETTIME_TIMEVAL(&tv);
      sctpstat.sctps_discontinuitytime.tv_sec = (uint32_t) tv.tv_sec;
      sctpstat.sctps_discontinuitytime.tv_usec = (uint32_t) tv.tv_usec;
      /* init the empty list of (All) Endpoints */
      LIST_INIT(&sctppcbinfo.listhead);

      /* init the iterator head */
      TAILQ_INIT(&sctppcbinfo.iteratorhead);

      /* init the hash table of endpoints */
      TUNABLE_INT_FETCH("net.inet.sctp.tcbhashsize", &sctp_hashtblsize);
      TUNABLE_INT_FETCH("net.inet.sctp.pcbhashsize", &sctp_pcbtblsize);
      TUNABLE_INT_FETCH("net.inet.sctp.chunkscale", &sctp_chunkscale);
      sctppcbinfo.sctp_asochash = SCTP_HASH_INIT((sctp_hashtblsize * 31),
          &sctppcbinfo.hashasocmark);
      sctppcbinfo.sctp_ephash = SCTP_HASH_INIT(sctp_hashtblsize,
          &sctppcbinfo.hashmark);
      sctppcbinfo.sctp_tcpephash = SCTP_HASH_INIT(sctp_hashtblsize,
          &sctppcbinfo.hashtcpmark);
      sctppcbinfo.hashtblsize = sctp_hashtblsize;

      /* init the small hash table we use to track restarted asoc's */
      sctppcbinfo.sctp_restarthash = SCTP_HASH_INIT(SCTP_STACK_VTAG_HASH_SIZE,
          &sctppcbinfo.hashrestartmark);


      sctppcbinfo.sctp_vrfhash = SCTP_HASH_INIT(SCTP_SIZE_OF_VRF_HASH,
          &sctppcbinfo.hashvrfmark);

      sctppcbinfo.vrf_ifn_hash = SCTP_HASH_INIT(SCTP_VRF_IFN_HASH_SIZE,
          &sctppcbinfo.vrf_ifn_hashmark);

      /* init the zones */
      /*
       * FIX ME: Should check for NULL returns, but if it does fail we are
       * doomed to panic anyways... add later maybe.
       */
      SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_ep, "sctp_ep",
          sizeof(struct sctp_inpcb), maxsockets);

      SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_asoc, "sctp_asoc",
          sizeof(struct sctp_tcb), sctp_max_number_of_assoc);

      SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_laddr, "sctp_laddr",
          sizeof(struct sctp_laddr),
          (sctp_max_number_of_assoc * sctp_scale_up_for_address));

      SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_net, "sctp_raddr",
          sizeof(struct sctp_nets),
          (sctp_max_number_of_assoc * sctp_scale_up_for_address));

      SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_chunk, "sctp_chunk",
          sizeof(struct sctp_tmit_chunk),
          (sctp_max_number_of_assoc * sctp_chunkscale));

      SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_readq, "sctp_readq",
          sizeof(struct sctp_queued_to_read),
          (sctp_max_number_of_assoc * sctp_chunkscale));

      SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_strmoq, "sctp_stream_msg_out",
          sizeof(struct sctp_stream_queue_pending),
          (sctp_max_number_of_assoc * sctp_chunkscale));

      SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_asconf_ack, "sctp_asconf_ack",
          sizeof(struct sctp_asconf_ack),
          (sctp_max_number_of_assoc * sctp_chunkscale));


      /* Master Lock INIT for info structure */
      SCTP_INP_INFO_LOCK_INIT();
      SCTP_STATLOG_INIT_LOCK();
      SCTP_ITERATOR_LOCK_INIT();

      SCTP_IPI_COUNT_INIT();
      SCTP_IPI_ADDR_INIT();
      SCTP_IPI_ITERATOR_WQ_INIT();
#ifdef SCTP_PACKET_LOGGING
      SCTP_IP_PKTLOG_INIT();
#endif
      LIST_INIT(&sctppcbinfo.addr_wq);

      /* not sure if we need all the counts */
      sctppcbinfo.ipi_count_ep = 0;
      /* assoc/tcb zone info */
      sctppcbinfo.ipi_count_asoc = 0;
      /* local addrlist zone info */
      sctppcbinfo.ipi_count_laddr = 0;
      /* remote addrlist zone info */
      sctppcbinfo.ipi_count_raddr = 0;
      /* chunk info */
      sctppcbinfo.ipi_count_chunk = 0;

      /* socket queue zone info */
      sctppcbinfo.ipi_count_readq = 0;

      /* stream out queue cont */
      sctppcbinfo.ipi_count_strmoq = 0;

      sctppcbinfo.ipi_free_strmoq = 0;
      sctppcbinfo.ipi_free_chunks = 0;

      SCTP_OS_TIMER_INIT(&sctppcbinfo.addr_wq_timer.timer);

      /* Init the TIMEWAIT list */
      for (i = 0; i < SCTP_STACK_VTAG_HASH_SIZE_A; i++) {
            LIST_INIT(&sctppcbinfo.vtag_timewait[i]);
      }

#if defined(SCTP_USE_THREAD_BASED_ITERATOR)
      sctppcbinfo.iterator_running = 0;
      sctp_startup_iterator();
#endif

      /*
       * INIT the default VRF which for BSD is the only one, other O/S's
       * may have more. But initially they must start with one and then
       * add the VRF's as addresses are added.
       */
      sctp_init_vrf_list(SCTP_DEFAULT_VRF);

}


int
sctp_load_addresses_from_init(struct sctp_tcb *stcb, struct mbuf *m,
    int iphlen, int offset, int limit, struct sctphdr *sh,
    struct sockaddr *altsa)
{
      /*
       * grub through the INIT pulling addresses and loading them to the
       * nets structure in the asoc. The from address in the mbuf should
       * also be loaded (if it is not already). This routine can be called
       * with either INIT or INIT-ACK's as long as the m points to the IP
       * packet and the offset points to the beginning of the parameters.
       */
      struct sctp_inpcb *inp, *l_inp;
      struct sctp_nets *net, *net_tmp;
      struct ip *iph;
      struct sctp_paramhdr *phdr, parm_buf;
      struct sctp_tcb *stcb_tmp;
      uint16_t ptype, plen;
      struct sockaddr *sa;
      struct sockaddr_storage dest_store;
      struct sockaddr *local_sa = (struct sockaddr *)&dest_store;
      struct sockaddr_in sin;
      struct sockaddr_in6 sin6;
      uint8_t random_store[SCTP_PARAM_BUFFER_SIZE];
      struct sctp_auth_random *p_random = NULL;
      uint16_t random_len = 0;
      uint8_t hmacs_store[SCTP_PARAM_BUFFER_SIZE];
      struct sctp_auth_hmac_algo *hmacs = NULL;
      uint16_t hmacs_len = 0;
      uint8_t saw_asconf = 0;
      uint8_t saw_asconf_ack = 0;
      uint8_t chunks_store[SCTP_PARAM_BUFFER_SIZE];
      struct sctp_auth_chunk_list *chunks = NULL;
      uint16_t num_chunks = 0;
      sctp_key_t *new_key;
      uint32_t keylen;
      int got_random = 0, got_hmacs = 0, got_chklist = 0;

      /* First get the destination address setup too. */
      memset(&sin, 0, sizeof(sin));
      memset(&sin6, 0, sizeof(sin6));

      sin.sin_family = AF_INET;
      sin.sin_len = sizeof(sin);
      sin.sin_port = stcb->rport;

      sin6.sin6_family = AF_INET6;
      sin6.sin6_len = sizeof(struct sockaddr_in6);
      sin6.sin6_port = stcb->rport;
      if (altsa == NULL) {
            iph = mtod(m, struct ip *);
            if (iph->ip_v == IPVERSION) {
                  /* its IPv4 */
                  struct sockaddr_in *sin_2;

                  sin_2 = (struct sockaddr_in *)(local_sa);
                  memset(sin_2, 0, sizeof(sin));
                  sin_2->sin_family = AF_INET;
                  sin_2->sin_len = sizeof(sin);
                  sin_2->sin_port = sh->dest_port;
                  sin_2->sin_addr.s_addr = iph->ip_dst.s_addr;
                  sin.sin_addr = iph->ip_src;
                  sa = (struct sockaddr *)&sin;
            } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
                  /* its IPv6 */
                  struct ip6_hdr *ip6;
                  struct sockaddr_in6 *sin6_2;

                  ip6 = mtod(m, struct ip6_hdr *);
                  sin6_2 = (struct sockaddr_in6 *)(local_sa);
                  memset(sin6_2, 0, sizeof(sin6));
                  sin6_2->sin6_family = AF_INET6;
                  sin6_2->sin6_len = sizeof(struct sockaddr_in6);
                  sin6_2->sin6_port = sh->dest_port;
                  sin6.sin6_addr = ip6->ip6_src;
                  sa = (struct sockaddr *)&sin6;
            } else {
                  sa = NULL;
            }
      } else {
            /*
             * For cookies we use the src address NOT from the packet
             * but from the original INIT
             */
            sa = altsa;
      }
      /* Turn off ECN until we get through all params */
      stcb->asoc.ecn_allowed = 0;
      TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
            /* mark all addresses that we have currently on the list */
            net->dest_state |= SCTP_ADDR_NOT_IN_ASSOC;
      }
      /* does the source address already exist? if so skip it */
      l_inp = inp = stcb->sctp_ep;

      atomic_add_int(&stcb->asoc.refcnt, 1);
      stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net_tmp, local_sa, stcb);
      atomic_add_int(&stcb->asoc.refcnt, -1);

      if ((stcb_tmp == NULL && inp == stcb->sctp_ep) || inp == NULL) {
            /* we must add the source address */
            /* no scope set here since we have a tcb already. */
            if ((sa->sa_family == AF_INET) &&
                (stcb->asoc.ipv4_addr_legal)) {
                  if (sctp_add_remote_addr(stcb, sa, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_2)) {
                        return (-1);
                  }
            } else if ((sa->sa_family == AF_INET6) &&
                (stcb->asoc.ipv6_addr_legal)) {
                  if (sctp_add_remote_addr(stcb, sa, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_3)) {
                        return (-2);
                  }
            }
      } else {
            if (net_tmp != NULL && stcb_tmp == stcb) {
                  net_tmp->dest_state &= ~SCTP_ADDR_NOT_IN_ASSOC;
            } else if (stcb_tmp != stcb) {
                  /* It belongs to another association? */
                  if (stcb_tmp)
                        SCTP_TCB_UNLOCK(stcb_tmp);
                  return (-3);
            }
      }
      if (stcb->asoc.state == 0) {
            /* the assoc was freed? */
            return (-4);
      }
      /*
       * peer must explicitly turn this on. This may have been initialized
       * to be "on" in order to allow local addr changes while INIT's are
       * in flight.
       */
      stcb->asoc.peer_supports_asconf = 0;
      /* now we must go through each of the params. */
      phdr = sctp_get_next_param(m, offset, &parm_buf, sizeof(parm_buf));
      while (phdr) {
            ptype = ntohs(phdr->param_type);
            plen = ntohs(phdr->param_length);
            /*
             * printf("ptype => %0x, plen => %d\n", (uint32_t)ptype,
             * (int)plen);
             */
            if (offset + plen > limit) {
                  break;
            }
            if (plen == 0) {
                  break;
            }
            if (ptype == SCTP_IPV4_ADDRESS) {
                  if (stcb->asoc.ipv4_addr_legal) {
                        struct sctp_ipv4addr_param *p4, p4_buf;

                        /* ok get the v4 address and check/add */
                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
                        if (plen != sizeof(struct sctp_ipv4addr_param) ||
                            phdr == NULL) {
                              return (-5);
                        }
                        p4 = (struct sctp_ipv4addr_param *)phdr;
                        sin.sin_addr.s_addr = p4->addr;
                        if (IN_MULTICAST(sin.sin_addr.s_addr)) {
                              /* Skip multi-cast addresses */
                              goto next_param;
                        }
                        if ((sin.sin_addr.s_addr == INADDR_BROADCAST) ||
                            (sin.sin_addr.s_addr == INADDR_ANY)) {
                              goto next_param;
                        }
                        sa = (struct sockaddr *)&sin;
                        inp = stcb->sctp_ep;
                        atomic_add_int(&stcb->asoc.refcnt, 1);
                        stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net,
                            local_sa, stcb);
                        atomic_add_int(&stcb->asoc.refcnt, -1);

                        if ((stcb_tmp == NULL && inp == stcb->sctp_ep) ||
                            inp == NULL) {
                              /* we must add the source address */
                              /*
                               * no scope set since we have a tcb
                               * already
                               */

                              /*
                               * we must validate the state again
                               * here
                               */
                              if (stcb->asoc.state == 0) {
                                    /* the assoc was freed? */
                                    return (-7);
                              }
                              if (sctp_add_remote_addr(stcb, sa, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_4)) {
                                    return (-8);
                              }
                        } else if (stcb_tmp == stcb) {
                              if (stcb->asoc.state == 0) {
                                    /* the assoc was freed? */
                                    return (-10);
                              }
                              if (net != NULL) {
                                    /* clear flag */
                                    net->dest_state &=
                                        ~SCTP_ADDR_NOT_IN_ASSOC;
                              }
                        } else {
                              /*
                               * strange, address is in another
                               * assoc? straighten out locks.
                               */
                              if (stcb_tmp)
                                    SCTP_TCB_UNLOCK(stcb_tmp);

                              if (stcb->asoc.state == 0) {
                                    /* the assoc was freed? */
                                    return (-12);
                              }
                              return (-13);
                        }
                  }
            } else if (ptype == SCTP_IPV6_ADDRESS) {
                  if (stcb->asoc.ipv6_addr_legal) {
                        /* ok get the v6 address and check/add */
                        struct sctp_ipv6addr_param *p6, p6_buf;

                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
                        if (plen != sizeof(struct sctp_ipv6addr_param) ||
                            phdr == NULL) {
                              return (-14);
                        }
                        p6 = (struct sctp_ipv6addr_param *)phdr;
                        memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
                            sizeof(p6->addr));
                        if (IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
                              /* Skip multi-cast addresses */
                              goto next_param;
                        }
                        if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
                              /*
                               * Link local make no sense without
                               * scope
                               */
                              goto next_param;
                        }
                        sa = (struct sockaddr *)&sin6;
                        inp = stcb->sctp_ep;
                        atomic_add_int(&stcb->asoc.refcnt, 1);
                        stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net,
                            local_sa, stcb);
                        atomic_add_int(&stcb->asoc.refcnt, -1);
                        if (stcb_tmp == NULL && (inp == stcb->sctp_ep ||
                            inp == NULL)) {
                              /*
                               * we must validate the state again
                               * here
                               */
                              if (stcb->asoc.state == 0) {
                                    /* the assoc was freed? */
                                    return (-16);
                              }
                              /*
                               * we must add the address, no scope
                               * set
                               */
                              if (sctp_add_remote_addr(stcb, sa, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_5)) {
                                    return (-17);
                              }
                        } else if (stcb_tmp == stcb) {
                              /*
                               * we must validate the state again
                               * here
                               */
                              if (stcb->asoc.state == 0) {
                                    /* the assoc was freed? */
                                    return (-19);
                              }
                              if (net != NULL) {
                                    /* clear flag */
                                    net->dest_state &=
                                        ~SCTP_ADDR_NOT_IN_ASSOC;
                              }
                        } else {
                              /*
                               * strange, address is in another
                               * assoc? straighten out locks.
                               */
                              if (stcb_tmp)
                                    SCTP_TCB_UNLOCK(stcb_tmp);

                              if (stcb->asoc.state == 0) {
                                    /* the assoc was freed? */
                                    return (-21);
                              }
                              return (-22);
                        }
                  }
            } else if (ptype == SCTP_ECN_CAPABLE) {
                  stcb->asoc.ecn_allowed = 1;
            } else if (ptype == SCTP_ULP_ADAPTATION) {
                  if (stcb->asoc.state != SCTP_STATE_OPEN) {
                        struct sctp_adaptation_layer_indication ai,
                                                        *aip;

                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&ai, sizeof(ai));
                        aip = (struct sctp_adaptation_layer_indication *)phdr;
                        if (aip) {
                              stcb->asoc.peers_adaptation = ntohl(aip->indication);
                              stcb->asoc.adaptation_needed = 1;
                        }
                  }
            } else if (ptype == SCTP_SET_PRIM_ADDR) {
                  struct sctp_asconf_addr_param lstore, *fee;
                  struct sctp_asconf_addrv4_param *fii;
                  int lptype;
                  struct sockaddr *lsa = NULL;

                  stcb->asoc.peer_supports_asconf = 1;
                  if (plen > sizeof(lstore)) {
                        return (-23);
                  }
                  phdr = sctp_get_next_param(m, offset,
                      (struct sctp_paramhdr *)&lstore, min(plen, sizeof(lstore)));
                  if (phdr == NULL) {
                        return (-24);
                  }
                  fee = (struct sctp_asconf_addr_param *)phdr;
                  lptype = ntohs(fee->addrp.ph.param_type);
                  if (lptype == SCTP_IPV4_ADDRESS) {
                        if (plen !=
                            sizeof(struct sctp_asconf_addrv4_param)) {
                              SCTP_PRINTF("Sizeof setprim in init/init ack not %d but %d - ignored\n",
                                  (int)sizeof(struct sctp_asconf_addrv4_param),
                                  plen);
                        } else {
                              fii = (struct sctp_asconf_addrv4_param *)fee;
                              sin.sin_addr.s_addr = fii->addrp.addr;
                              lsa = (struct sockaddr *)&sin;
                        }
                  } else if (lptype == SCTP_IPV6_ADDRESS) {
                        if (plen !=
                            sizeof(struct sctp_asconf_addr_param)) {
                              SCTP_PRINTF("Sizeof setprim (v6) in init/init ack not %d but %d - ignored\n",
                                  (int)sizeof(struct sctp_asconf_addr_param),
                                  plen);
                        } else {
                              memcpy(sin6.sin6_addr.s6_addr,
                                  fee->addrp.addr,
                                  sizeof(fee->addrp.addr));
                              lsa = (struct sockaddr *)&sin6;
                        }
                  }
                  if (lsa) {
                        (void)sctp_set_primary_addr(stcb, sa, NULL);
                  }
            } else if (ptype == SCTP_PRSCTP_SUPPORTED) {
                  /* Peer supports pr-sctp */
                  stcb->asoc.peer_supports_prsctp = 1;
            } else if (ptype == SCTP_SUPPORTED_CHUNK_EXT) {
                  /* A supported extension chunk */
                  struct sctp_supported_chunk_types_param *pr_supported;
                  uint8_t local_store[SCTP_PARAM_BUFFER_SIZE];
                  int num_ent, i;

                  phdr = sctp_get_next_param(m, offset,
                      (struct sctp_paramhdr *)&local_store, min(sizeof(local_store), plen));
                  if (phdr == NULL) {
                        return (-25);
                  }
                  stcb->asoc.peer_supports_asconf = 0;
                  stcb->asoc.peer_supports_prsctp = 0;
                  stcb->asoc.peer_supports_pktdrop = 0;
                  stcb->asoc.peer_supports_strreset = 0;
                  stcb->asoc.peer_supports_auth = 0;
                  pr_supported = (struct sctp_supported_chunk_types_param *)phdr;
                  num_ent = plen - sizeof(struct sctp_paramhdr);
                  for (i = 0; i < num_ent; i++) {
                        switch (pr_supported->chunk_types[i]) {
                        case SCTP_ASCONF:
                        case SCTP_ASCONF_ACK:
                              stcb->asoc.peer_supports_asconf = 1;
                              break;
                        case SCTP_FORWARD_CUM_TSN:
                              stcb->asoc.peer_supports_prsctp = 1;
                              break;
                        case SCTP_PACKET_DROPPED:
                              stcb->asoc.peer_supports_pktdrop = 1;
                              break;
                        case SCTP_STREAM_RESET:
                              stcb->asoc.peer_supports_strreset = 1;
                              break;
                        case SCTP_AUTHENTICATION:
                              stcb->asoc.peer_supports_auth = 1;
                              break;
                        default:
                              /* one I have not learned yet */
                              break;

                        }
                  }
            } else if (ptype == SCTP_ECN_NONCE_SUPPORTED) {
                  /* Peer supports ECN-nonce */
                  stcb->asoc.peer_supports_ecn_nonce = 1;
                  stcb->asoc.ecn_nonce_allowed = 1;
            } else if (ptype == SCTP_RANDOM) {
                  if (plen > sizeof(random_store))
                        break;
                  if (got_random) {
                        /* already processed a RANDOM */
                        goto next_param;
                  }
                  phdr = sctp_get_next_param(m, offset,
                      (struct sctp_paramhdr *)random_store,
                      min(sizeof(random_store), plen));
                  if (phdr == NULL)
                        return (-26);
                  p_random = (struct sctp_auth_random *)phdr;
                  random_len = plen - sizeof(*p_random);
                  /* enforce the random length */
                  if (random_len != SCTP_AUTH_RANDOM_SIZE_REQUIRED) {
                        SCTPDBG(SCTP_DEBUG_AUTH1, "SCTP: invalid RANDOM len\n");
                        return (-27);
                  }
                  got_random = 1;
            } else if (ptype == SCTP_HMAC_LIST) {
                  int num_hmacs;
                  int i;

                  if (plen > sizeof(hmacs_store))
                        break;
                  if (got_hmacs) {
                        /* already processed a HMAC list */
                        goto next_param;
                  }
                  phdr = sctp_get_next_param(m, offset,
                      (struct sctp_paramhdr *)hmacs_store,
                      min(plen, sizeof(hmacs_store)));
                  if (phdr == NULL)
                        return (-28);
                  hmacs = (struct sctp_auth_hmac_algo *)phdr;
                  hmacs_len = plen - sizeof(*hmacs);
                  num_hmacs = hmacs_len / sizeof(hmacs->hmac_ids[0]);
                  /* validate the hmac list */
                  if (sctp_verify_hmac_param(hmacs, num_hmacs)) {
                        return (-29);
                  }
                  if (stcb->asoc.peer_hmacs != NULL)
                        sctp_free_hmaclist(stcb->asoc.peer_hmacs);
                  stcb->asoc.peer_hmacs = sctp_alloc_hmaclist(num_hmacs);
                  if (stcb->asoc.peer_hmacs != NULL) {
                        for (i = 0; i < num_hmacs; i++) {
                              (void)sctp_auth_add_hmacid(stcb->asoc.peer_hmacs,
                                  ntohs(hmacs->hmac_ids[i]));
                        }
                  }
                  got_hmacs = 1;
            } else if (ptype == SCTP_CHUNK_LIST) {
                  int i;

                  if (plen > sizeof(chunks_store))
                        break;
                  if (got_chklist) {
                        /* already processed a Chunks list */
                        goto next_param;
                  }
                  phdr = sctp_get_next_param(m, offset,
                      (struct sctp_paramhdr *)chunks_store,
                      min(plen, sizeof(chunks_store)));
                  if (phdr == NULL)
                        return (-30);
                  chunks = (struct sctp_auth_chunk_list *)phdr;
                  num_chunks = plen - sizeof(*chunks);
                  if (stcb->asoc.peer_auth_chunks != NULL)
                        sctp_clear_chunklist(stcb->asoc.peer_auth_chunks);
                  else
                        stcb->asoc.peer_auth_chunks = sctp_alloc_chunklist();
                  for (i = 0; i < num_chunks; i++) {
                        (void)sctp_auth_add_chunk(chunks->chunk_types[i],
                            stcb->asoc.peer_auth_chunks);
                        /* record asconf/asconf-ack if listed */
                        if (chunks->chunk_types[i] == SCTP_ASCONF)
                              saw_asconf = 1;
                        if (chunks->chunk_types[i] == SCTP_ASCONF_ACK)
                              saw_asconf_ack = 1;

                  }
                  got_chklist = 1;
            } else if ((ptype == SCTP_HEARTBEAT_INFO) ||
                      (ptype == SCTP_STATE_COOKIE) ||
                      (ptype == SCTP_UNRECOG_PARAM) ||
                      (ptype == SCTP_COOKIE_PRESERVE) ||
                      (ptype == SCTP_SUPPORTED_ADDRTYPE) ||
                      (ptype == SCTP_ADD_IP_ADDRESS) ||
                      (ptype == SCTP_DEL_IP_ADDRESS) ||
                      (ptype == SCTP_ERROR_CAUSE_IND) ||
                (ptype == SCTP_SUCCESS_REPORT)) {
                   /* don't care */ ;
            } else {
                  if ((ptype & 0x8000) == 0x0000) {
                        /*
                         * must stop processing the rest of the
                         * param's. Any report bits were handled
                         * with the call to
                         * sctp_arethere_unrecognized_parameters()
                         * when the INIT or INIT-ACK was first seen.
                         */
                        break;
                  }
            }
next_param:
            offset += SCTP_SIZE32(plen);
            if (offset >= limit) {
                  break;
            }
            phdr = sctp_get_next_param(m, offset, &parm_buf,
                sizeof(parm_buf));
      }
      /* Now check to see if we need to purge any addresses */
      for (net = TAILQ_FIRST(&stcb->asoc.nets); net != NULL; net = net_tmp) {
            net_tmp = TAILQ_NEXT(net, sctp_next);
            if ((net->dest_state & SCTP_ADDR_NOT_IN_ASSOC) ==
                SCTP_ADDR_NOT_IN_ASSOC) {
                  /* This address has been removed from the asoc */
                  /* remove and free it */
                  stcb->asoc.numnets--;
                  TAILQ_REMOVE(&stcb->asoc.nets, net, sctp_next);
                  sctp_free_remote_addr(net);
                  if (net == stcb->asoc.primary_destination) {
                        stcb->asoc.primary_destination = NULL;
                        sctp_select_primary_destination(stcb);
                  }
            }
      }
      /* validate authentication required parameters */
      if (got_random && got_hmacs) {
            stcb->asoc.peer_supports_auth = 1;
      } else {
            stcb->asoc.peer_supports_auth = 0;
      }
      if (!stcb->asoc.peer_supports_auth && got_chklist) {
            /* peer does not support auth but sent a chunks list? */
            return (-31);
      }
      if (!sctp_asconf_auth_nochk && stcb->asoc.peer_supports_asconf &&
          !stcb->asoc.peer_supports_auth) {
            /* peer supports asconf but not auth? */
            return (-32);
      } else if ((stcb->asoc.peer_supports_asconf) && (stcb->asoc.peer_supports_auth) &&
          ((saw_asconf == 0) || (saw_asconf_ack == 0))) {
            return (-33);
      }
      /* concatenate the full random key */
#ifdef SCTP_AUTH_DRAFT_04
      keylen = random_len;
      new_key = sctp_alloc_key(keylen);
      if (new_key != NULL) {
            /* copy in the RANDOM */
            if (p_random != NULL)
                  bcopy(p_random->random_data, new_key->key, random_len);
      }
#else
      keylen = sizeof(*p_random) + random_len + sizeof(*chunks) + num_chunks +
          sizeof(*hmacs) + hmacs_len;
      new_key = sctp_alloc_key(keylen);
      if (new_key != NULL) {
            /* copy in the RANDOM */
            if (p_random != NULL) {
                  keylen = sizeof(*p_random) + random_len;
                  bcopy(p_random, new_key->key, keylen);
            }
            /* append in the AUTH chunks */
            if (chunks != NULL) {
                  bcopy(chunks, new_key->key + keylen,
                      sizeof(*chunks) + num_chunks);
                  keylen += sizeof(*chunks) + num_chunks;
            }
            /* append in the HMACs */
            if (hmacs != NULL) {
                  bcopy(hmacs, new_key->key + keylen,
                      sizeof(*hmacs) + hmacs_len);
            }
      }
#endif
      else {
            /* failed to get memory for the key */
            return (-34);
      }
      if (stcb->asoc.authinfo.peer_random != NULL)
            sctp_free_key(stcb->asoc.authinfo.peer_random);
      stcb->asoc.authinfo.peer_random = new_key;
#ifdef SCTP_AUTH_DRAFT_04
      /* don't include the chunks and hmacs for draft -04 */
      stcb->asoc.authinfo.peer_random->keylen = random_len;
#endif
      sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.assoc_keyid);
      sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.recv_keyid);

      return (0);
}

int
sctp_set_primary_addr(struct sctp_tcb *stcb, struct sockaddr *sa,
    struct sctp_nets *net)
{
      /* make sure the requested primary address exists in the assoc */
      if (net == NULL && sa)
            net = sctp_findnet(stcb, sa);

      if (net == NULL) {
            /* didn't find the requested primary address! */
            return (-1);
      } else {
            /* set the primary address */
            if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
                  /* Must be confirmed, so queue to set */
                  net->dest_state |= SCTP_ADDR_REQ_PRIMARY;
                  return (0);
            }
            stcb->asoc.primary_destination = net;
            net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY;
            net = TAILQ_FIRST(&stcb->asoc.nets);
            if (net != stcb->asoc.primary_destination) {
                  /*
                   * first one on the list is NOT the primary
                   * sctp_cmpaddr() is much more efficent if the
                   * primary is the first on the list, make it so.
                   */
                  TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
                  TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
            }
            return (0);
      }
}

int
sctp_is_vtag_good(struct sctp_inpcb *inp, uint32_t tag, struct timeval *now, int save_in_twait)
{
      /*
       * This function serves two purposes. It will see if a TAG can be
       * re-used and return 1 for yes it is ok and 0 for don't use that
       * tag. A secondary function it will do is purge out old tags that
       * can be removed.
       */
      struct sctpasochead *head;
      struct sctpvtaghead *chain;
      struct sctp_tagblock *twait_block;
      struct sctp_tcb *stcb;
      int i;

      SCTP_INP_INFO_WLOCK();
      chain = &sctppcbinfo.vtag_timewait[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
      /* First is the vtag in use ? */

      head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(tag,
          sctppcbinfo.hashasocmark)];
      if (head == NULL) {
            goto check_restart;
      }
      LIST_FOREACH(stcb, head, sctp_asocs) {

            if (stcb->asoc.my_vtag == tag) {
                  /*
                   * We should remove this if and return 0 always if
                   * we want vtags unique across all endpoints. For
                   * now within a endpoint is ok.
                   */
                  if (inp == stcb->sctp_ep) {
                        /* bad tag, in use */
                        SCTP_INP_INFO_WUNLOCK();
                        return (0);
                  }
            }
      }
check_restart:
      /* Now lets check the restart hash */
      head = &sctppcbinfo.sctp_restarthash[SCTP_PCBHASH_ASOC(tag,
          sctppcbinfo.hashrestartmark)];
      if (head == NULL) {
            goto check_time_wait;
      }
      LIST_FOREACH(stcb, head, sctp_tcbrestarhash) {
            if (stcb->asoc.assoc_id == tag) {
                  /* candidate */
                  if (inp == stcb->sctp_ep) {
                        /* bad tag, in use */
                        SCTP_INP_INFO_WUNLOCK();
                        return (0);
                  }
            }
      }
check_time_wait:
      /* Now what about timed wait ? */
      if (!SCTP_LIST_EMPTY(chain)) {
            /*
             * Block(s) are present, lets see if we have this tag in the
             * list
             */
            LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
                  for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
                        if (twait_block->vtag_block[i].v_tag == 0) {
                              /* not used */
                              continue;
                        } else if ((long)twait_block->vtag_block[i].tv_sec_at_expire <
                            now->tv_sec) {
                              /* Audit expires this guy */
                              twait_block->vtag_block[i].tv_sec_at_expire = 0;
                              twait_block->vtag_block[i].v_tag = 0;
                        } else if (twait_block->vtag_block[i].v_tag ==
                            tag) {
                              /* Bad tag, sorry :< */
                              SCTP_INP_INFO_WUNLOCK();
                              return (0);
                        }
                  }
            }
      }
      /*-
       * Not found, ok to use the tag, add it to the time wait hash
       * as well this will prevent two sucessive cookies from getting
       * the same tag or two inits sent quickly on multi-processors.
       * We only keep the tag for the life of a cookie and when we
       * add this tag to the assoc hash we need to purge it from
       * the t-wait hash.
       */
      if (save_in_twait)
            sctp_add_vtag_to_timewait(tag, TICKS_TO_SEC(inp->sctp_ep.def_cookie_life));
      SCTP_INP_INFO_WUNLOCK();
      return (1);
}


static sctp_assoc_t reneged_asoc_ids[256];
static uint8_t reneged_at = 0;


static void
sctp_drain_mbufs(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
      /*
       * We must hunt this association for MBUF's past the cumack (i.e.
       * out of order data that we can renege on).
       */
      struct sctp_association *asoc;
      struct sctp_tmit_chunk *chk, *nchk;
      uint32_t cumulative_tsn_p1, tsn;
      struct sctp_queued_to_read *ctl, *nctl;
      int cnt, strmat, gap;

      /* We look for anything larger than the cum-ack + 1 */

      SCTP_STAT_INCR(sctps_protocol_drain_calls);
      if (sctp_do_drain == 0) {
            return;
      }
      asoc = &stcb->asoc;
      if (asoc->cumulative_tsn == asoc->highest_tsn_inside_map) {
            /* none we can reneg on. */
            return;
      }
      SCTP_STAT_INCR(sctps_protocol_drains_done);
      cumulative_tsn_p1 = asoc->cumulative_tsn + 1;
      cnt = 0;
      /* First look in the re-assembly queue */
      chk = TAILQ_FIRST(&asoc->reasmqueue);
      while (chk) {
            /* Get the next one */
            nchk = TAILQ_NEXT(chk, sctp_next);
            if (compare_with_wrap(chk->rec.data.TSN_seq,
                cumulative_tsn_p1, MAX_TSN)) {
                  /* Yep it is above cum-ack */
                  cnt++;
                  tsn = chk->rec.data.TSN_seq;
                  if (tsn >= asoc->mapping_array_base_tsn) {
                        gap = tsn - asoc->mapping_array_base_tsn;
                  } else {
                        gap = (MAX_TSN - asoc->mapping_array_base_tsn) +
                            tsn + 1;
                  }
                  asoc->size_on_reasm_queue = sctp_sbspace_sub(asoc->size_on_reasm_queue, chk->send_size);
                  sctp_ucount_decr(asoc->cnt_on_reasm_queue);
                  SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
                  TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
                  if (chk->data) {
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                  }
                  sctp_free_a_chunk(stcb, chk);
            }
            chk = nchk;
      }
      /* Ok that was fun, now we will drain all the inbound streams? */
      for (strmat = 0; strmat < asoc->streamincnt; strmat++) {
            ctl = TAILQ_FIRST(&asoc->strmin[strmat].inqueue);
            while (ctl) {
                  nctl = TAILQ_NEXT(ctl, next);
                  if (compare_with_wrap(ctl->sinfo_tsn,
                      cumulative_tsn_p1, MAX_TSN)) {
                        /* Yep it is above cum-ack */
                        cnt++;
                        tsn = ctl->sinfo_tsn;
                        if (tsn >= asoc->mapping_array_base_tsn) {
                              gap = tsn -
                                  asoc->mapping_array_base_tsn;
                        } else {
                              gap = (MAX_TSN -
                                  asoc->mapping_array_base_tsn) +
                                  tsn + 1;
                        }
                        asoc->size_on_all_streams = sctp_sbspace_sub(asoc->size_on_all_streams, ctl->length);
                        sctp_ucount_decr(asoc->cnt_on_all_streams);

                        SCTP_UNSET_TSN_PRESENT(asoc->mapping_array,
                            gap);
                        TAILQ_REMOVE(&asoc->strmin[strmat].inqueue,
                            ctl, next);
                        if (ctl->data) {
                              sctp_m_freem(ctl->data);
                              ctl->data = NULL;
                        }
                        sctp_free_remote_addr(ctl->whoFrom);
                        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_readq, ctl);
                        SCTP_DECR_READQ_COUNT();
                  }
                  ctl = nctl;
            }
      }
      /*
       * Question, should we go through the delivery queue? The only
       * reason things are on here is the app not reading OR a p-d-api up.
       * An attacker COULD send enough in to initiate the PD-API and then
       * send a bunch of stuff to other streams... these would wind up on
       * the delivery queue.. and then we would not get to them. But in
       * order to do this I then have to back-track and un-deliver
       * sequence numbers in streams.. el-yucko. I think for now we will
       * NOT look at the delivery queue and leave it to be something to
       * consider later. An alternative would be to abort the P-D-API with
       * a notification and then deliver the data.... Or another method
       * might be to keep track of how many times the situation occurs and
       * if we see a possible attack underway just abort the association.
       */
#ifdef SCTP_DEBUG
      if (cnt) {
            SCTPDBG(SCTP_DEBUG_PCB1, "Freed %d chunks from reneg harvest\n", cnt);
      }
#endif
      if (cnt) {
            /*
             * Now do we need to find a new
             * asoc->highest_tsn_inside_map?
             */
            if (asoc->highest_tsn_inside_map >= asoc->mapping_array_base_tsn) {
                  gap = asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn;
            } else {
                  gap = (MAX_TSN - asoc->mapping_array_base_tsn) +
                      asoc->highest_tsn_inside_map + 1;
            }
            if (gap >= (asoc->mapping_array_size << 3)) {
                  /*
                   * Something bad happened or cum-ack and high were
                   * behind the base, but if so earlier checks should
                   * have found NO data... wierd... we will start at
                   * end of mapping array.
                   */
                  SCTP_PRINTF("Gap was larger than array?? %d set to max:%d maparraymax:%x\n",
                      (int)gap,
                      (int)(asoc->mapping_array_size << 3),
                      (int)asoc->highest_tsn_inside_map);
                  gap = asoc->mapping_array_size << 3;
            }
            while (gap > 0) {
                  if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
                        /* found the new highest */
                        asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn + gap;
                        break;
                  }
                  gap--;
            }
            if (gap == 0) {
                  /* Nothing left in map */
                  memset(asoc->mapping_array, 0, asoc->mapping_array_size);
                  asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
                  asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
            }
            asoc->last_revoke_count = cnt;
            (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
            /* sa_ignore NO_NULL_CHK */
            sctp_send_sack(stcb);
            sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_DRAIN, SCTP_SO_NOT_LOCKED);
            reneged_asoc_ids[reneged_at] = sctp_get_associd(stcb);
            reneged_at++;
      }
      /*
       * Another issue, in un-setting the TSN's in the mapping array we
       * DID NOT adjust the higest_tsn marker.  This will cause one of two
       * things to occur. It may cause us to do extra work in checking for
       * our mapping array movement. More importantly it may cause us to
       * SACK every datagram. This may not be a bad thing though since we
       * will recover once we get our cum-ack above and all this stuff we
       * dumped recovered.
       */
}

void
sctp_drain()
{
      /*
       * We must walk the PCB lists for ALL associations here. The system
       * is LOW on MBUF's and needs help. This is where reneging will
       * occur. We really hope this does NOT happen!
       */
      struct sctp_inpcb *inp;
      struct sctp_tcb *stcb;

      SCTP_INP_INFO_RLOCK();
      LIST_FOREACH(inp, &sctppcbinfo.listhead, sctp_list) {
            /* For each endpoint */
            SCTP_INP_RLOCK(inp);
            LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                  /* For each association */
                  SCTP_TCB_LOCK(stcb);
                  sctp_drain_mbufs(inp, stcb);
                  SCTP_TCB_UNLOCK(stcb);
            }
            SCTP_INP_RUNLOCK(inp);
      }
      SCTP_INP_INFO_RUNLOCK();
}

/*
 * start a new iterator
 * iterates through all endpoints and associations based on the pcb_state
 * flags and asoc_state.  "af" (mandatory) is executed for all matching
 * assocs and "ef" (optional) is executed when the iterator completes.
 * "inpf" (optional) is executed for each new endpoint as it is being
 * iterated through. inpe (optional) is called when the inp completes
 * its way through all the stcbs.
 */
int
sctp_initiate_iterator(inp_func inpf,
    asoc_func af,
    inp_func inpe,
    uint32_t pcb_state,
    uint32_t pcb_features,
    uint32_t asoc_state,
    void *argp,
    uint32_t argi,
    end_func ef,
    struct sctp_inpcb *s_inp,
    uint8_t chunk_output_off)
{
      struct sctp_iterator *it = NULL;

      if (af == NULL) {
            return (-1);
      }
      SCTP_MALLOC(it, struct sctp_iterator *, sizeof(struct sctp_iterator),
          SCTP_M_ITER);
      if (it == NULL) {
            SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOMEM);
            return (ENOMEM);
      }
      memset(it, 0, sizeof(*it));
      it->function_assoc = af;
      it->function_inp = inpf;
      if (inpf)
            it->done_current_ep = 0;
      else
            it->done_current_ep = 1;
      it->function_atend = ef;
      it->pointer = argp;
      it->val = argi;
      it->pcb_flags = pcb_state;
      it->pcb_features = pcb_features;
      it->asoc_state = asoc_state;
      it->function_inp_end = inpe;
      it->no_chunk_output = chunk_output_off;
      if (s_inp) {
            it->inp = s_inp;
            it->iterator_flags = SCTP_ITERATOR_DO_SINGLE_INP;
      } else {
            SCTP_INP_INFO_RLOCK();
            it->inp = LIST_FIRST(&sctppcbinfo.listhead);

            SCTP_INP_INFO_RUNLOCK();
            it->iterator_flags = SCTP_ITERATOR_DO_ALL_INP;

      }
      SCTP_IPI_ITERATOR_WQ_LOCK();
      if (it->inp) {
            SCTP_INP_INCR_REF(it->inp);
      }
      TAILQ_INSERT_TAIL(&sctppcbinfo.iteratorhead, it, sctp_nxt_itr);
#if defined(SCTP_USE_THREAD_BASED_ITERATOR)
      if (sctppcbinfo.iterator_running == 0) {
            sctp_wakeup_iterator();
      }
      SCTP_IPI_ITERATOR_WQ_UNLOCK();
#else
      if (it->inp)
            SCTP_INP_DECR_REF(it->inp);
      SCTP_IPI_ITERATOR_WQ_UNLOCK();
      /* Init the timer */
      SCTP_OS_TIMER_INIT(&it->tmr.timer);
      /* add to the list of all iterators */
      sctp_timer_start(SCTP_TIMER_TYPE_ITERATOR, (struct sctp_inpcb *)it,
          NULL, NULL);
#endif
      /* sa_ignore MEMLEAK {memory is put on the tailq for the iterator} */
      return (0);
}

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