text: /*-
   * SPDX-License-Identifier: BSD-3-Clause
   *
   * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   * Copyright (c) 2008-2012, by Michael Tuexen. 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.
   */
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  #endif
  
  #include <netinet/sctp_os.h>
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #include <sys/proc.h>
  #endif
  #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>
  #if defined(INET) || defined(INET6)
  #if !defined(_WIN32)
  #include <netinet/udp.h>
  #endif
  #endif
  #ifdef INET6
  #if defined(__Userspace__)
  #include "user_ip6_var.h"
  #else
  #include <netinet6/ip6_var.h>
  #endif
  #endif
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #include <sys/sched.h>
  #include <sys/smp.h>
  #include <sys/unistd.h>
  #endif
  #if defined(__Userspace__)
  #include <user_socketvar.h>
  #include <user_atomic.h>
  #if !defined(_WIN32)
  #include <netdb.h>
  #endif
  #endif
  
  #if !defined(__FreeBSD__) || defined(__Userspace__)
  struct sctp_base_info system_base_info;
  
  #endif
  /* FIX: we don't handle multiple link local scopes */
  /* "scopeless" replacement IN6_ARE_ADDR_EQUAL */
  #ifdef INET6
  int
  SCTP6_ARE_ADDR_EQUAL(struct sockaddr_in6 *a, struct sockaddr_in6 *b)
  {
  #ifdef SCTP_EMBEDDED_V6_SCOPE
  #if defined(__APPLE__) && !defined(__Userspace__)
  	struct in6_addr tmp_a, tmp_b;
  
  	tmp_a = a->sin6_addr;
  #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
  	if (in6_embedscope(&tmp_a, a, NULL, NULL) != 0) {
  #else
  	if (in6_embedscope(&tmp_a, a, NULL, NULL, NULL) != 0) {
  #endif
  		return (0);
  	}
  	tmp_b = b->sin6_addr;
  #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
  	if (in6_embedscope(&tmp_b, b, NULL, NULL) != 0) {
  #else
  	if (in6_embedscope(&tmp_b, b, NULL, NULL, NULL) != 0) {
  #endif
  		return (0);
  	}
  	return (IN6_ARE_ADDR_EQUAL(&tmp_a, &tmp_b));
  #elif defined(SCTP_KAME)
  	struct sockaddr_in6 tmp_a, tmp_b;
  
  	memcpy(&tmp_a, a, sizeof(struct sockaddr_in6));
  	if (sa6_embedscope(&tmp_a, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
  		return (0);
  	}
  	memcpy(&tmp_b, b, sizeof(struct sockaddr_in6));
  	if (sa6_embedscope(&tmp_b, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
  		return (0);
  	}
  	return (IN6_ARE_ADDR_EQUAL(&tmp_a.sin6_addr, &tmp_b.sin6_addr));
  #else
  	struct in6_addr tmp_a, tmp_b;
  
  	tmp_a = a->sin6_addr;
  	if (in6_embedscope(&tmp_a, a) != 0) {
  		return (0);
  	}
  	tmp_b = b->sin6_addr;
  	if (in6_embedscope(&tmp_b, b) != 0) {
  		return (0);
  	}
  	return (IN6_ARE_ADDR_EQUAL(&tmp_a, &tmp_b));
  #endif
  #else
  	return (IN6_ARE_ADDR_EQUAL(&(a->sin6_addr), &(b->sin6_addr)));
  #endif /* SCTP_EMBEDDED_V6_SCOPE */
  }
  #endif
  
  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 = SCTP_BASE_INFO(ipi_count_ep);
  	spcb->asoc_count = SCTP_BASE_INFO(ipi_count_asoc);
  	spcb->laddr_count = SCTP_BASE_INFO(ipi_count_laddr);
  	spcb->raddr_count = SCTP_BASE_INFO(ipi_count_raddr);
  	spcb->chk_count = SCTP_BASE_INFO(ipi_count_chunk);
  	spcb->readq_count = SCTP_BASE_INFO(ipi_count_readq);
  	spcb->stream_oque = SCTP_BASE_INFO(ipi_count_strmoq);
  	spcb->free_chunks = SCTP_BASE_INFO(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 separate 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 = &SCTP_BASE_INFO(sctp_vrfhash)[(vrf_id & SCTP_BASE_INFO(hashvrfmark))];
  	LIST_INSERT_HEAD(bucket, vrf, next_vrf);
  	atomic_add_int(&SCTP_BASE_INFO(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 that's wrong problems could occur :-)
  	 */
  	SCTP_IPI_ADDR_LOCK_ASSERT();
  	hash_ifn_head = &SCTP_BASE_INFO(vrf_ifn_hash)[(ifn_index & SCTP_BASE_INFO(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 = &SCTP_BASE_INFO(sctp_vrfhash)[(vrf_id & SCTP_BASE_INFO(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)
  {
  	if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&vrf->refcount)) {
                  if (vrf->vrf_addr_hash) {
                      SCTP_HASH_FREE(vrf->vrf_addr_hash, vrf->vrf_addr_hashmark);
                      vrf->vrf_addr_hash = NULL;
                  }
  		/* We zero'd the count */
  		LIST_REMOVE(vrf, next_vrf);
  		SCTP_FREE(vrf, SCTP_M_VRF);
  		atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_vrfs), 1);
  	}
  }
  
  void
  sctp_free_ifn(struct sctp_ifn *sctp_ifnp)
  {
  	if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&sctp_ifnp->refcount)) {
  		/* 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(&SCTP_BASE_INFO(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)
  {
  	if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&sctp_ifap->refcount)) {
  		/* 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(&SCTP_BASE_INFO(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();
  	} else {
  		SCTP_IPI_ADDR_WLOCK_ASSERT();
  	}
  	LIST_REMOVE(sctp_ifnp, next_bucket);
  	LIST_REMOVE(sctp_ifnp, next_ifn);
  	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;
  
  	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 unusable\n");
  		goto out;
  	}
  	if (if_name) {
  		if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, SCTP_IFNAMSIZ) != 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;
  
  	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 unusable\n");
  		goto out;
  	}
  	if (if_name) {
  		if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, SCTP_IFNAMSIZ) != 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;
  	switch (ifa_af) {
  #ifdef INET
  	case AF_INET:
  		sctp_ifnp->num_v4++;
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  		sctp_ifnp->num_v6++;
  		break;
  #endif
  	default:
  		break;
  	}
  	if (sctp_ifnp->ifa_count == 1) {
  		/* register the new interface */
  		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)
  {
  	LIST_REMOVE(sctp_ifap, next_ifa);
  	if (sctp_ifap->ifn_p) {
  		/* update address counts */
  		sctp_ifap->ifn_p->ifa_count--;
  		switch (sctp_ifap->address.sa.sa_family) {
  #ifdef INET
  		case AF_INET:
  			sctp_ifap->ifn_p->num_v4--;
  			break;
  #endif
  #ifdef INET6
  		case AF_INET6:
  			sctp_ifap->ifn_p->num_v6--;
  			break;
  #endif
  		default:
  			break;
  		}
  
  		if (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_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_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, *new_sctp_ifnp;
  	struct sctp_ifa *sctp_ifap, *new_sctp_ifap;
  	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_MALLOC(new_sctp_ifnp, struct sctp_ifn *,
  	            sizeof(struct sctp_ifn), SCTP_M_IFN);
  	if (new_sctp_ifnp == NULL) {
  #ifdef INVARIANTS
  		panic("No memory for IFN");
  #endif
  		return (NULL);
  	}
  	SCTP_MALLOC(new_sctp_ifap, struct sctp_ifa *, sizeof(struct sctp_ifa), SCTP_M_IFA);
  	if (new_sctp_ifap == NULL) {
  #ifdef INVARIANTS
  		panic("No memory for IFA");
  #endif
  		SCTP_FREE(new_sctp_ifnp, SCTP_M_IFN);
  		return (NULL);
  	}
  
  	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();
  				SCTP_FREE(new_sctp_ifnp, SCTP_M_IFN);
  				SCTP_FREE(new_sctp_ifap, SCTP_M_IFA);
  				return (NULL);
  			}
  		}
  	}
  	if (sctp_ifnp == NULL) {
  		/* build one and add it, can't hold lock
  		 * until after malloc done though.
  		 */
  		sctp_ifnp = new_sctp_ifnp;
  		new_sctp_ifnp = 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) {
  			SCTP_SNPRINTF(sctp_ifnp->ifn_name, SCTP_IFNAMSIZ, "%s", if_name);
  		} else {
  			SCTP_SNPRINTF(sctp_ifnp->ifn_name, SCTP_IFNAMSIZ, "%s", "unknown");
  		}
  		hash_ifn_head = &SCTP_BASE_INFO(vrf_ifn_hash)[(ifn_index & SCTP_BASE_INFO(vrf_ifn_hashmark))];
  		LIST_INIT(&sctp_ifnp->ifalist);
  		LIST_INSERT_HEAD(hash_ifn_head, sctp_ifnp, next_bucket);
  		LIST_INSERT_HEAD(&vrf->ifnlist, sctp_ifnp, next_ifn);
  		atomic_add_int(&SCTP_BASE_INFO(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,
  				(void *)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();
  			if (new_sctp_ifnp != NULL) {
  				SCTP_FREE(new_sctp_ifnp, SCTP_M_IFN);
  			}
  			SCTP_FREE(new_sctp_ifap, SCTP_M_IFA);
  			return (sctp_ifap);
  		} else {
  			if (sctp_ifap->ifn_p) {
  				/*
  				 * The last IFN gets the address, remove the
  				 * old one
  				 */
  				SCTPDBG(SCTP_DEBUG_PCB4, "Moving ifa %p from %s (0x%x) to %s (0x%x)\n",
  					(void *)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",
  					(void *)sctp_ifnp, (void *)sctp_ifap);
  				sctp_add_ifa_to_ifn(sctp_ifnp, sctp_ifap);
  			}
  			goto exit_stage_left;
  		}
  	}
  	sctp_ifap = new_sctp_ifap;
  	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;
  #ifdef HAVE_SA_LEN
  	memcpy(&sctp_ifap->address, addr, addr->sa_len);
  #else
  	switch (addr->sa_family) {
  #ifdef INET
  	case AF_INET:
  		memcpy(&sctp_ifap->address, addr, sizeof(struct sockaddr_in));
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  		memcpy(&sctp_ifap->address, addr, sizeof(struct sockaddr_in6));
  		break;
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  		memcpy(&sctp_ifap->address, addr, sizeof(struct sockaddr_conn));
  		break;
  #endif
  	default:
  		/* TSNH */
  		break;
  	}
  #endif
  	sctp_ifap->localifa_flags = SCTP_ADDR_VALID | SCTP_ADDR_DEFER_USE;
  	sctp_ifap->flags = ifa_flags;
  	/* Set scope */
  	switch (sctp_ifap->address.sa.sa_family) {
  #ifdef INET
  	case AF_INET:
  	{
  		struct sockaddr_in *sin;
  
  		sin = &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;
  		break;
  	}
  #endif
  #ifdef INET6
  	case AF_INET6:
  	{
  		/* ok to use deprecated addresses? */
  		struct sockaddr_in6 *sin6;
  
  		sin6 = &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;
  		break;
  	}
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  		if (new_ifn_af)
  			new_ifn_af = AF_CONN;
  		break;
  #endif
  	default:
  		new_ifn_af = 0;
  		break;
  	}
  	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;
  	}
  	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(&SCTP_BASE_INFO(ipi_count_ifas), 1);
  	if (new_ifn_af) {
  		sctp_ifnp->registered_af = new_ifn_af;
  	}
  	SCTP_IPI_ADDR_WUNLOCK();
  	if (new_sctp_ifnp != NULL) {
  		SCTP_FREE(new_sctp_ifnp, SCTP_M_IFN);
  	}
  
  	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(SCTP_BASE_INFO(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();
  		memset(wi, 0, sizeof(*wi));
  		(void)SCTP_GETTIME_TIMEVAL(&wi->start_time);
  		wi->ifa = sctp_ifap;
  		wi->action = SCTP_ADD_IP_ADDRESS;
  
  		SCTP_WQ_ADDR_LOCK();
  		LIST_INSERT_HEAD(&SCTP_BASE_INFO(addr_wq), wi, sctp_nxt_addr);
  		sctp_timer_start(SCTP_TIMER_TYPE_ADDR_WQ,
  				 (struct sctp_inpcb *)NULL,
  				 (struct sctp_tcb *)NULL,
  				 (struct sctp_nets *)NULL);
  		SCTP_WQ_ADDR_UNLOCK();
  	} 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.
  			 */
  			if (if_name) {
  				if (strncmp(if_name, sctp_ifap->ifn_p->ifn_name, SCTP_IFNAMSIZ) == 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", (void *)sctp_ifap);
  		sctp_ifap->localifa_flags &= SCTP_ADDR_VALID;
  		/*
  		 * We don't set the flag. This means that the structure will
  		 * hang around in EP's that have bound specific to it until
  		 * they close. This gives us TCP like behavior if someone
  		 * removes an address (or for that matter adds it right back).
  		 */
  		/* 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(SCTP_BASE_INFO(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();
  		memset(wi, 0, sizeof(*wi));
  		(void)SCTP_GETTIME_TIMEVAL(&wi->start_time);
  		wi->ifa = sctp_ifap;
  		wi->action = SCTP_DEL_IP_ADDRESS;
  		SCTP_WQ_ADDR_LOCK();
  		/*
  		 * Should this really be a tailq? As it is we will process the
  		 * newest first :-0
  		 */
  		LIST_INSERT_HEAD(&SCTP_BASE_INFO(addr_wq), wi, sctp_nxt_addr);
  		sctp_timer_start(SCTP_TIMER_TYPE_ADDR_WQ,
  				 (struct sctp_inpcb *)NULL,
  				 (struct sctp_tcb *)NULL,
  				 (struct sctp_nets *)NULL);
  		SCTP_WQ_ADDR_UNLOCK();
  	}
  	return;
  }
  
  static int
  sctp_does_stcb_own_this_addr(struct sctp_tcb *stcb, struct sockaddr *to)
  {
  	int loopback_scope;
  #if defined(INET)
  	int ipv4_local_scope, ipv4_addr_legal;
  #endif
  #if defined(INET6)
  	int local_scope, site_scope, ipv6_addr_legal;
  #endif
  #if defined(__Userspace__)
  	int conn_addr_legal;
  #endif
  	struct sctp_vrf *vrf;
  	struct sctp_ifn *sctp_ifn;
  	struct sctp_ifa *sctp_ifa;
  
  	loopback_scope = stcb->asoc.scope.loopback_scope;
  #if defined(INET)
  	ipv4_local_scope = stcb->asoc.scope.ipv4_local_scope;
  	ipv4_addr_legal = stcb->asoc.scope.ipv4_addr_legal;
  #endif
  #if defined(INET6)
  	local_scope = stcb->asoc.scope.local_scope;
  	site_scope = stcb->asoc.scope.site_scope;
  	ipv6_addr_legal = stcb->asoc.scope.ipv6_addr_legal;
  #endif
  #if defined(__Userspace__)
  	conn_addr_legal = stcb->asoc.scope.conn_addr_legal;
  #endif
  
  	SCTP_IPI_ADDR_RLOCK();
  	vrf = sctp_find_vrf(stcb->asoc.vrf_id);
  	if (vrf == NULL) {
  		/* no vrf, no addresses */
  		SCTP_IPI_ADDR_RUNLOCK();
  		return (0);
  	}
  
  	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
  		LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
  			if ((loopback_scope == 0) &&
  			    SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
  				continue;
  			}
  			LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
  				if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
  				    (!sctp_is_addr_pending(stcb, sctp_ifa))) {
  					/* We allow pending addresses, where we
  					 * have sent an asconf-add to be considered
  					 * valid.
  					 */
  					continue;
  				}
  				if (sctp_ifa->address.sa.sa_family != to->sa_family) {
  					continue;
  				}
  				switch (sctp_ifa->address.sa.sa_family) {
  #ifdef INET
  				case AF_INET:
  					if (ipv4_addr_legal) {
  						struct sockaddr_in *sin, *rsin;
  
  						sin = &sctp_ifa->address.sin;
  						rsin = (struct sockaddr_in *)to;
  						if ((ipv4_local_scope == 0) &&
  						    IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
  							continue;
  						}
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  						if (prison_check_ip4(stcb->sctp_ep->ip_inp.inp.inp_cred,
  						                     &sin->sin_addr) != 0) {
  							continue;
  						}
  #endif
  						if (sin->sin_addr.s_addr == rsin->sin_addr.s_addr) {
  							SCTP_IPI_ADDR_RUNLOCK();
  							return (1);
  						}
  					}
  					break;
  #endif
  #ifdef INET6
  				case AF_INET6:
  					if (ipv6_addr_legal) {
  						struct sockaddr_in6 *sin6, *rsin6;
  #if defined(SCTP_EMBEDDED_V6_SCOPE) && !defined(SCTP_KAME)
  						struct sockaddr_in6 lsa6;
  #endif
  						sin6 = &sctp_ifa->address.sin6;
  						rsin6 = (struct sockaddr_in6 *)to;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  						if (prison_check_ip6(stcb->sctp_ep->ip_inp.inp.inp_cred,
  						                     &sin6->sin6_addr) != 0) {
  							continue;
  						}
  #endif
  						if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
  							if (local_scope == 0)
  								continue;
  #if defined(SCTP_EMBEDDED_V6_SCOPE)
  							if (sin6->sin6_scope_id == 0) {
  #ifdef SCTP_KAME
  								if (sa6_recoverscope(sin6) != 0)
  									continue;
  #else
  								lsa6 = *sin6;
  								if (in6_recoverscope(&lsa6,
  								                     &lsa6.sin6_addr,
  								                     NULL))
  									continue;
  								sin6 = &lsa6;
  #endif /* SCTP_KAME */
  							}
  #endif /* SCTP_EMBEDDED_V6_SCOPE */
  						}
  						if ((site_scope == 0) &&
  						    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
  							continue;
  						}
  						if (SCTP6_ARE_ADDR_EQUAL(sin6, rsin6)) {
  							SCTP_IPI_ADDR_RUNLOCK();
  							return (1);
  						}
  					}
  					break;
  #endif
  #if defined(__Userspace__)
  				case AF_CONN:
  					if (conn_addr_legal) {
  						struct sockaddr_conn *sconn, *rsconn;
  
  						sconn = &sctp_ifa->address.sconn;
  						rsconn = (struct sockaddr_conn *)to;
  						if (sconn->sconn_addr == rsconn->sconn_addr) {
  							SCTP_IPI_ADDR_RUNLOCK();
  							return (1);
  						}
  					}
  					break;
  #endif
  				default:
  					/* TSNH */
  					break;
  				}
  			}
  		}
  	} else {
  		struct sctp_laddr *laddr;
  
  		LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
  			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
  				SCTPDBG(SCTP_DEBUG_PCB1, "ifa being deleted\n");
  				continue;
  			}
  			if (sctp_is_addr_restricted(stcb, laddr->ifa) &&
  			    (!sctp_is_addr_pending(stcb, laddr->ifa))) {
  				/* We allow pending addresses, where we
  				 * have sent an asconf-add to be considered
  				 * valid.
  				 */
  				continue;
  			}
  			if (laddr->ifa->address.sa.sa_family != to->sa_family) {
  				continue;
  			}
  			switch (to->sa_family) {
  #ifdef INET
  			case AF_INET:
  			{
  				struct sockaddr_in *sin, *rsin;
  
  				sin = &laddr->ifa->address.sin;
  				rsin = (struct sockaddr_in *)to;
  				if (sin->sin_addr.s_addr == rsin->sin_addr.s_addr) {
  					SCTP_IPI_ADDR_RUNLOCK();
  					return (1);
  				}
  				break;
  			}
  #endif
  #ifdef INET6
  			case AF_INET6:
  			{
  				struct sockaddr_in6 *sin6, *rsin6;
  
  				sin6 = &laddr->ifa->address.sin6;
  				rsin6 = (struct sockaddr_in6 *)to;
  				if (SCTP6_ARE_ADDR_EQUAL(sin6, rsin6)) {
  					SCTP_IPI_ADDR_RUNLOCK();
  					return (1);
  				}
  				break;
  			}
  
  #endif
  #if defined(__Userspace__)
  			case AF_CONN:
  			{
  				struct sockaddr_conn *sconn, *rsconn;
  
  				sconn = &laddr->ifa->address.sconn;
  				rsconn = (struct sockaddr_conn *)to;
  				if (sconn->sconn_addr == rsconn->sconn_addr) {
  					SCTP_IPI_ADDR_RUNLOCK();
  					return (1);
  				}
  				break;
  			}
  #endif
  			default:
  				/* TSNH */
  				break;
  			}
  		}
  	}
  	SCTP_IPI_ADDR_RUNLOCK();
  	return (0);
  }
  
  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;
  #ifdef SCTP_MVRF
  	int fnd, i;
  #endif
  
  	if ((to == NULL) || (from == NULL)) {
  		return (NULL);
  	}
  
  	switch (to->sa_family) {
  #ifdef INET
  	case AF_INET:
  		if (from->sa_family == AF_INET) {
  			lport = ((struct sockaddr_in *)to)->sin_port;
  			rport = ((struct sockaddr_in *)from)->sin_port;
  		} else {
  			return (NULL);
  		}
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  		if (from->sa_family == AF_INET6) {
  			lport = ((struct sockaddr_in6 *)to)->sin6_port;
  			rport = ((struct sockaddr_in6 *)from)->sin6_port;
  		} else {
  			return (NULL);
  		}
  		break;
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  		if (from->sa_family == AF_CONN) {
  			lport = ((struct sockaddr_conn *)to)->sconn_port;
  			rport = ((struct sockaddr_conn *)from)->sconn_port;
  		} else {
  			return (NULL);
  		}
  		break;
  #endif
  	default:
  		return (NULL);
  	}
  	ephead = &SCTP_BASE_INFO(sctp_tcpephash)[SCTP_PCBHASH_ALLADDR((lport | rport), SCTP_BASE_INFO(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 defined(__FreeBSD__) && !defined(__Userspace__)
  		switch (to->sa_family) {
  #ifdef INET
  		case AF_INET:
  		{
  			struct sockaddr_in *sin;
  
  			sin = (struct sockaddr_in *)to;
  			if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
  			                     &sin->sin_addr) != 0) {
  				SCTP_INP_RUNLOCK(inp);
  				continue;
  			}
  			break;
  		}
  #endif
  #ifdef INET6
  		case AF_INET6:
  		{
  			struct sockaddr_in6 *sin6;
  
  			sin6 = (struct sockaddr_in6 *)to;
  			if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
  			                     &sin6->sin6_addr) != 0) {
  				SCTP_INP_RUNLOCK(inp);
  				continue;
  			}
  			break;
  		}
  #endif
  		default:
  			SCTP_INP_RUNLOCK(inp);
  			continue;
  		}
  #endif
  #ifdef SCTP_MVRF
  		fnd = 0;
  		for (i = 0; i < inp->num_vrfs; i++) {
  			if (inp->m_vrf_ids[i] == vrf_id) {
  				fnd = 1;
  				break;
  			}
  		}
  		if (fnd == 0) {
  			SCTP_INP_RUNLOCK(inp);
  			continue;
  		}
  #else
  		if (inp->def_vrf_id != vrf_id) {
  			SCTP_INP_RUNLOCK(inp);
  			continue;
  		}
  #endif
  		/* 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", __func__);
  					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 */
  #ifdef INET
  					if (from->sa_family == AF_INET) {
  						struct sockaddr_in *intf_addr, *sin;
  
  						intf_addr = &laddr->ifa->address.sin;
  						sin = (struct sockaddr_in *)to;
  						if (sin->sin_addr.s_addr ==
  						    intf_addr->sin_addr.s_addr) {
  							match = 1;
  							break;
  						}
  					}
  #endif
  #ifdef INET6
  					if (from->sa_family == AF_INET6) {
  						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,
  						    intf_addr6)) {
  							match = 1;
  							break;
  						}
  					}
  #endif
  #if defined(__Userspace__)
  					if (from->sa_family == AF_CONN) {
  						struct sockaddr_conn *intf_addr, *sconn;
  
  						intf_addr = &laddr->ifa->address.sconn;
  						sconn = (struct sockaddr_conn *)to;
  						if (sconn->sconn_addr ==
  						    intf_addr->sconn_addr) {
  							match = 1;
  							break;
  						}
  					}
  #endif
  				}
  			}
  			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?
  		 */
  		/* XXX: Why don't we TAILQ_FOREACH through sctp_asoc_list? */
  		stcb = LIST_FIRST(&inp->sctp_asoc_list);
  		if (stcb == NULL) {
  			SCTP_INP_RUNLOCK(inp);
  			continue;
  		}
  		SCTP_TCB_LOCK(stcb);
  		if (!sctp_does_stcb_own_this_addr(stcb, to)) {
  			SCTP_TCB_UNLOCK(stcb);
  			SCTP_INP_RUNLOCK(inp);
  			continue;
  		}
  		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;
  		}
  		if (!sctp_does_stcb_own_this_addr(stcb, to)) {
  			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;
  			}
  			switch (from->sa_family) {
  #ifdef INET
  			case 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);
  				}
  				break;
  			}
  #endif
  #ifdef INET6
  			case AF_INET6:
  			{
  				struct sockaddr_in6 *sin6, *rsin6;
  
  				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
  				rsin6 = (struct sockaddr_in6 *)from;
  				if (SCTP6_ARE_ADDR_EQUAL(sin6,
  				    rsin6)) {
  					/* found it */
  					if (netp != NULL) {
  						*netp = net;
  					}
  					/* Update the endpoint pointer */
  					*inp_p = inp;
  					SCTP_INP_RUNLOCK(inp);
  					return (stcb);
  				}
  				break;
  			}
  #endif
  #if defined(__Userspace__)
  			case AF_CONN:
  			{
  				struct sockaddr_conn *sconn, *rsconn;
  
  				sconn = (struct sockaddr_conn *)&net->ro._l_addr;
  				rsconn = (struct sockaddr_conn *)from;
  				if (sconn->sconn_addr == rsconn->sconn_addr) {
  					/* found it */
  					if (netp != NULL) {
  						*netp = net;
  					}
  					/* Update the endpoint pointer */
  					*inp_p = inp;
  					SCTP_INP_RUNLOCK(inp);
  					return (stcb);
  				}
  				break;
  			}
  #endif
  			default:
  				/* TSNH */
  				break;
  			}
  		}
  		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;
  	switch (remote->sa_family) {
  #ifdef INET
  	case AF_INET:
  		rport = (((struct sockaddr_in *)remote)->sin_port);
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  		rport = (((struct sockaddr_in6 *)remote)->sin6_port);
  		break;
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  		rport = (((struct sockaddr_conn *)remote)->sconn_port);
  		break;
  #endif
  	default:
  		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) ||
  	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
  		/*-
  		 * 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) && SCTP_IS_LISTENING(inp)) {
  			/* to is peer addr, from is my addr */
  #ifndef SCTP_MVRF
  			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);
  			}
  #else
  			/*-
  			 * MVRF is tricky, we must look in every VRF
  			 * the endpoint has.
  			 */
  			int i;
  
  			for (i = 0; i < inp->num_vrfs; i++) {
  				stcb = sctp_tcb_special_locate(inp_p, remote, local,
  				                               netp, inp->m_vrf_ids[i]);
  				if ((stcb != NULL) && (locked_tcb == NULL)) {
  					/* we have a locked tcb, lower refcount */
  					SCTP_INP_DECR_REF(inp);
  					break;
  				}
  				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);
  					break;
  				}
  			}
  #endif
  			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;
  			}
  			if (local && !sctp_does_stcb_own_this_addr(stcb, local)) {
  				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;
  				}
  				switch (remote->sa_family) {
  #ifdef INET
  				case 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);
  					}
  					break;
  				}
  #endif
  #ifdef INET6
  				case 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,
  					    rsin6)) {
  						/* 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);
  					}
  					break;
  				}
  #endif
  #if defined(__Userspace__)
  				case AF_CONN:
  				{
  					struct sockaddr_conn *sconn, *rsconn;
  
  					sconn = (struct sockaddr_conn *)&net->ro._l_addr;
  					rsconn = (struct sockaddr_conn *)remote;
  					if (sconn->sconn_addr == rsconn->sconn_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);
  					}
  					break;
  				}
  #endif
  				default:
  					/* TSNH */
  					break;
  				}
  			}
  			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)];
  		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;
  			}
  			if (local && !sctp_does_stcb_own_this_addr(stcb, local)) {
  				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;
  				}
  				switch (remote->sa_family) {
  #ifdef INET
  				case 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);
  					}
  					break;
  				}
  #endif
  #ifdef INET6
  				case 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,
  					    rsin6)) {
  						/* 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);
  					}
  					break;
  				}
  #endif
  #if defined(__Userspace__)
  				case AF_CONN:
  				{
  					struct sockaddr_conn *sconn, *rsconn;
  
  					sconn = (struct sockaddr_conn *)&net->ro._l_addr;
  					rsconn = (struct sockaddr_conn *)remote;
  					if (sconn->sconn_addr == rsconn->sconn_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);
  					}
  					break;
  				}
  #endif
  				default:
  					/* TSNH */
  					break;
  				}
  			}
  			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_findasoc_ep_asocid_locked(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 (inp == NULL) {
  		SCTP_PRINTF("TSNH ep_associd\n");
  		return (NULL);
  	}
  	if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
  		SCTP_PRINTF("TSNH ep_associd0\n");
  		return (NULL);
  	}
  	id = (uint32_t)asoc_id;
  	head = &inp->sctp_asocidhash[SCTP_PCBHASH_ASOC(id, inp->hashasocidmark)];
  	if (head == NULL) {
  		/* invalid id TSNH */
  		SCTP_PRINTF("TSNH ep_associd1\n");
  		return (NULL);
  	}
  	LIST_FOREACH(stcb, head, sctp_tcbasocidhash) {
  		if (stcb->asoc.assoc_id == id) {
  			if (inp != stcb->sctp_ep) {
  				/*
  				 * some other guy has the same id active (id
  				 * collision ??).
  				 */
  				SCTP_PRINTF("TSNH ep_associd2\n");
  				continue;
  			}
  			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
  				continue;
  			}
  			if (want_lock) {
  				SCTP_TCB_LOCK(stcb);
  			}
  			return (stcb);
  		}
  	}
  	return (NULL);
  }
  
  struct sctp_tcb *
  sctp_findassociation_ep_asocid(struct sctp_inpcb *inp, sctp_assoc_t asoc_id, int want_lock)
  {
  	struct sctp_tcb *stcb;
  
  	SCTP_INP_RLOCK(inp);
  	stcb = sctp_findasoc_ep_asocid_locked(inp, asoc_id, want_lock);
  	SCTP_INP_RUNLOCK(inp);
  	return (stcb);
  }
  
  /*
   * Endpoint probe expects that the INP_INFO is locked.
   */
  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 sctp_laddr *laddr;
  #ifdef INET
  	struct sockaddr_in *sin;
  #endif
  #ifdef INET6
  	struct sockaddr_in6 *sin6;
  	struct sockaddr_in6 *intf_addr6;
  #endif
  #if defined(__Userspace__)
  	struct sockaddr_conn *sconn;
  #endif
  #ifdef SCTP_MVRF
  	int i;
  #endif
  	int  fnd;
  
  #ifdef INET
  	sin = NULL;
  #endif
  #ifdef INET6
  	sin6 = NULL;
  #endif
  #if defined(__Userspace__)
  	sconn = NULL;
  #endif
  	switch (nam->sa_family) {
  #ifdef INET
  	case AF_INET:
  		sin = (struct sockaddr_in *)nam;
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  		sin6 = (struct sockaddr_in6 *)nam;
  		break;
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  		sconn = (struct sockaddr_conn *)nam;
  		break;
  #endif
  	default:
  		/* 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 */
  			switch (nam->sa_family) {
  #ifdef INET
  			case AF_INET:
  				if ((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;
  				}
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  				if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
  				                     &sin->sin_addr) != 0) {
  					SCTP_INP_RUNLOCK(inp);
  					continue;
  				}
  #endif
  				break;
  #endif
  #ifdef INET6
  			case AF_INET6:
  				/* A V6 address and the endpoint is NOT bound V6 */
  				if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
  					SCTP_INP_RUNLOCK(inp);
  					continue;
  				}
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  				if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
  				                     &sin6->sin6_addr) != 0) {
  					SCTP_INP_RUNLOCK(inp);
  					continue;
  				}
  #endif
  				break;
  #endif
  			default:
  				break;
  			}
  			/* does a VRF id match? */
  			fnd = 0;
  #ifdef SCTP_MVRF
  			for (i = 0; i < inp->num_vrfs; i++) {
  				if (inp->m_vrf_ids[i] == vrf_id) {
  					fnd = 1;
  					break;
  				}
  			}
  #else
  			if (inp->def_vrf_id == vrf_id)
  				fnd = 1;
  #endif
  
  			SCTP_INP_RUNLOCK(inp);
  			if (!fnd)
  				continue;
  			return (inp);
  		}
  		SCTP_INP_RUNLOCK(inp);
  	}
  	switch (nam->sa_family) {
  #ifdef INET
  	case AF_INET:
  		if (sin->sin_addr.s_addr == INADDR_ANY) {
  			/* Can't hunt for one that has no address specified */
  			return (NULL);
  		}
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  			/* Can't hunt for one that has no address specified */
  			return (NULL);
  		}
  		break;
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  		if (sconn->sconn_addr == NULL) {
  			return (NULL);
  		}
  		break;
  #endif
  	default:
  		break;
  	}
  	/*
  	 * 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;
  #ifdef SCTP_MVRF
  		for (i = 0; i < inp->num_vrfs; i++) {
  			if (inp->m_vrf_ids[i] == vrf_id) {
  				fnd = 1;
  				break;
  			}
  		}
  #else
  		if (inp->def_vrf_id == vrf_id)
  			fnd = 1;
  
  #endif
  		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",
  					__func__);
  				continue;
  			}
  			SCTPDBG(SCTP_DEBUG_PCB1, "Ok laddr->ifa:%p is possible, ",
  				(void *)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 */
  				switch (nam->sa_family) {
  #ifdef INET
  				case AF_INET:
  #if defined(__APPLE__) && !defined(__Userspace__)
  					if (sin == NULL) {
  						/* TSNH */
  						break;
  					}
  #endif
  					if (sin->sin_addr.s_addr ==
  					    laddr->ifa->address.sin.sin_addr.s_addr) {
  						SCTP_INP_RUNLOCK(inp);
  						return (inp);
  					}
  					break;
  #endif
  #ifdef INET6
  				case AF_INET6:
  					intf_addr6 = &laddr->ifa->address.sin6;
  					if (SCTP6_ARE_ADDR_EQUAL(sin6,
  					    intf_addr6)) {
  						SCTP_INP_RUNLOCK(inp);
  						return (inp);
  					}
  					break;
  #endif
  #if defined(__Userspace__)
  				case AF_CONN:
  					if (sconn->sconn_addr == laddr->ifa->address.sconn.sconn_addr) {
  						SCTP_INP_RUNLOCK(inp);
  						return (inp);
  					}
  					break;
  #endif
  				}
  			}
  		}
  		SCTP_INP_RUNLOCK(inp);
  	}
  	return (NULL);
  }
  
  static struct sctp_inpcb *
  sctp_isport_inuse(struct sctp_inpcb *inp, uint16_t lport, uint32_t vrf_id)
  {
  	struct sctppcbhead *head;
  	struct sctp_inpcb *t_inp;
  #ifdef SCTP_MVRF
  	int i;
  #endif
  	int fnd;
  
  	head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(lport,
  	    SCTP_BASE_INFO(hashmark))];
  	LIST_FOREACH(t_inp, head, sctp_hash) {
  		if (t_inp->sctp_lport != lport) {
  			continue;
  		}
  		/* is it in the VRF in question */
  		fnd = 0;
  #ifdef SCTP_MVRF
  		for (i = 0; i < inp->num_vrfs; i++) {
  			if (t_inp->m_vrf_ids[i] == vrf_id) {
  				fnd = 1;
  				break;
  			}
  		}
  #else
  		if (t_inp->def_vrf_id == vrf_id)
  			fnd = 1;
  #endif
  		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 (t_inp);
  			} 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 (t_inp);
  		} 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 (t_inp);
  	}
  	return (NULL);
  }
  
  int
  sctp_swap_inpcb_for_listen(struct sctp_inpcb *inp)
  {
  	/* For 1-2-1 with port reuse */
  	struct sctppcbhead *head;
  	struct sctp_inpcb *tinp, *ninp;
  
  	if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_PORTREUSE)) {
  		/* only works with port reuse on */
  		return (-1);
  	}
  	if ((inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) {
  		return (0);
  	}
  	SCTP_INP_RUNLOCK(inp);
  	SCTP_INP_INFO_WLOCK();
  	head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(inp->sctp_lport,
  	                                    SCTP_BASE_INFO(hashmark))];
  	/* Kick out all non-listeners to the TCP hash */
  	LIST_FOREACH_SAFE(tinp, head, sctp_hash, ninp) {
  		if (tinp->sctp_lport != inp->sctp_lport) {
  			continue;
  		}
  		if (tinp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
  			continue;
  		}
  		if (tinp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
  			continue;
  		}
  		if (SCTP_IS_LISTENING(tinp)) {
  			continue;
  		}
  		SCTP_INP_WLOCK(tinp);
  		LIST_REMOVE(tinp, sctp_hash);
  		head = &SCTP_BASE_INFO(sctp_tcpephash)[SCTP_PCBHASH_ALLADDR(tinp->sctp_lport, SCTP_BASE_INFO(hashtcpmark))];
  		tinp->sctp_flags |= SCTP_PCB_FLAGS_IN_TCPPOOL;
  		LIST_INSERT_HEAD(head, tinp, sctp_hash);
  		SCTP_INP_WUNLOCK(tinp);
  	}
  	SCTP_INP_WLOCK(inp);
  	/* Pull from where he was */
  	LIST_REMOVE(inp, sctp_hash);
  	inp->sctp_flags &= ~SCTP_PCB_FLAGS_IN_TCPPOOL;
  	head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(inp->sctp_lport, SCTP_BASE_INFO(hashmark))];
  	LIST_INSERT_HEAD(head, inp, sctp_hash);
  	SCTP_INP_WUNLOCK(inp);
  	SCTP_INP_RLOCK(inp);
  	SCTP_INP_INFO_WUNLOCK();
  	return (0);
  }
  
  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;
  	int lport;
  	unsigned int i;
  #ifdef INET
  	struct sockaddr_in *sin;
  #endif
  #ifdef INET6
  	struct sockaddr_in6 *sin6;
  #endif
  #if defined(__Userspace__)
  	struct sockaddr_conn *sconn;
  #endif
  
  	switch (nam->sa_family) {
  #ifdef INET
  	case AF_INET:
  		sin = (struct sockaddr_in *)nam;
  		lport = sin->sin_port;
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  		sin6 = (struct sockaddr_in6 *)nam;
  		lport = sin6->sin6_port;
  		break;
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  		sconn = (struct sockaddr_conn *)nam;
  		lport = sconn->sconn_port;
  		break;
  #endif
  	default:
  		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 = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(lport,
  	    SCTP_BASE_INFO(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 still exists a connected socket for this
  	 * guy. If so we can return the first one that we find. This may NOT
  	 * be the correct one so the caller should be wary on the returned INP.
  	 * Currently the only caller that sets find_tcp_pool is in bindx where
  	 * we are verifying that a user CAN bind the address. He either
  	 * has bound it already, or someone else has, or its open to bind,
  	 * so this is good enough.
  	 */
  	if (inp == NULL && find_tcp_pool) {
  		for (i = 0; i < SCTP_BASE_INFO(hashtcpmark) + 1; i++) {
  			head = &SCTP_BASE_INFO(sctp_tcpephash)[i];
  			inp = sctp_endpoint_probe(nam, head, lport, vrf_id);
  			if (inp) {
  				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 *from, struct sockaddr *to,
      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 *stcb;
  
  	SCTP_INP_INFO_RLOCK();
  	if (find_tcp_pool) {
  		if (inp_p != NULL) {
  			stcb = sctp_tcb_special_locate(inp_p, from, to, netp,
  			                               vrf_id);
  		} else {
  			stcb = sctp_tcb_special_locate(&inp, from, to, netp,
  			                               vrf_id);
  		}
  		if (stcb != NULL) {
  			SCTP_INP_INFO_RUNLOCK();
  			return (stcb);
  		}
  	}
  	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) {
  		stcb = sctp_findassociation_ep_addr(inp_p, from, netp, to,
  		                                    NULL);
  	} else {
  		stcb = sctp_findassociation_ep_addr(&inp, from, netp, to,
  		                                    NULL);
  	}
  	return (stcb);
  }
  
  /*
   * 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 offset,
      struct sctphdr *sh, struct sctp_inpcb **inp_p, struct sctp_nets **netp,
      struct sockaddr *dst)
  {
  	struct sctp_paramhdr *phdr, param_buf;
  #if defined(INET) || defined(INET6)
  	struct sctp_tcb *stcb;
  	uint16_t ptype;
  #endif
  	uint16_t plen;
  #ifdef INET
  	struct sockaddr_in sin4;
  #endif
  #ifdef INET6
  	struct sockaddr_in6 sin6;
  #endif
  
  #ifdef INET
  	memset(&sin4, 0, sizeof(sin4));
  #ifdef HAVE_SIN_LEN
  	sin4.sin_len = sizeof(sin4);
  #endif
  	sin4.sin_family = AF_INET;
  	sin4.sin_port = sh->src_port;
  #endif
  #ifdef INET6
  	memset(&sin6, 0, sizeof(sin6));
  #ifdef HAVE_SIN6_LEN
  	sin6.sin6_len = sizeof(sin6);
  #endif
  	sin6.sin6_family = AF_INET6;
  	sin6.sin6_port = sh->src_port;
  #endif
  
  	offset += sizeof(struct sctp_init_chunk);
  
  	phdr = sctp_get_next_param(m, offset, &param_buf, sizeof(param_buf));
  	while (phdr != NULL) {
  		/* now we must see if we want the parameter */
  #if defined(INET) || defined(INET6)
  		ptype = ntohs(phdr->param_type);
  #endif
  		plen = ntohs(phdr->param_length);
  		if (plen == 0) {
  			break;
  		}
  #ifdef INET
  		if (ptype == SCTP_IPV4_ADDRESS &&
  		    plen == sizeof(struct sctp_ipv4addr_param)) {
  			/* Get the rest of the address */
  			struct sctp_ipv4addr_param ip4_param, *p4;
  
  			phdr = sctp_get_next_param(m, offset,
  			    (struct sctp_paramhdr *)&ip4_param, sizeof(ip4_param));
  			if (phdr == NULL) {
  				return (NULL);
  			}
  			p4 = (struct sctp_ipv4addr_param *)phdr;
  			memcpy(&sin4.sin_addr, &p4->addr, sizeof(p4->addr));
  			/* look it up */
  			stcb = sctp_findassociation_ep_addr(inp_p,
  			    (struct sockaddr *)&sin4, netp, dst, NULL);
  			if (stcb != NULL) {
  				return (stcb);
  			}
  		}
  #endif
  #ifdef INET6
  		if (ptype == SCTP_IPV6_ADDRESS &&
  		    plen == sizeof(struct sctp_ipv6addr_param)) {
  			/* Get the rest of the address */
  			struct sctp_ipv6addr_param ip6_param, *p6;
  
  			phdr = sctp_get_next_param(m, offset,
  			    (struct sctp_paramhdr *)&ip6_param, sizeof(ip6_param));
  			if (phdr == NULL) {
  				return (NULL);
  			}
  			p6 = (struct sctp_ipv6addr_param *)phdr;
  			memcpy(&sin6.sin6_addr, &p6->addr, sizeof(p6->addr));
  			/* look it up */
  			stcb = sctp_findassociation_ep_addr(inp_p,
  			    (struct sockaddr *)&sin6, netp, dst, NULL);
  			if (stcb != NULL) {
  				return (stcb);
  			}
  		}
  #endif
  		offset += SCTP_SIZE32(plen);
  		phdr = sctp_get_next_param(m, offset, &param_buf,
  					   sizeof(param_buf));
  	}
  	return (NULL);
  }
  
  static struct sctp_tcb *
  sctp_findassoc_by_vtag(struct sockaddr *from, struct sockaddr *to, uint32_t vtag,
  		       struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint16_t rport,
  		       uint16_t lport, int skip_src_check, uint32_t vrf_id, uint32_t remote_tag)
  {
  	/*
  	 * 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;
  #ifdef SCTP_MVRF
  	unsigned int i;
  #endif
  
  	SCTP_INP_INFO_RLOCK();
  	head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(vtag,
  	                                                        SCTP_BASE_INFO(hashasocmark))];
  	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;
  		}
  #ifdef SCTP_MVRF
  		for (i = 0; i < stcb->sctp_ep->num_vrfs; i++) {
  			if (stcb->sctp_ep->m_vrf_ids[i] == vrf_id) {
  				break;
  			}
  		}
  		if (i == stcb->sctp_ep->num_vrfs) {
  			SCTP_INP_RUNLOCK(inp);
  			continue;
  		}
  #else
  		if (stcb->sctp_ep->def_vrf_id != vrf_id) {
  			SCTP_INP_RUNLOCK(stcb->sctp_ep);
  			continue;
  		}
  #endif
  		SCTP_TCB_LOCK(stcb);
  		SCTP_INP_RUNLOCK(stcb->sctp_ep);
  		if (stcb->asoc.my_vtag == vtag) {
  			/* candidate */
  			if (stcb->rport != rport) {
  				SCTP_TCB_UNLOCK(stcb);
  				continue;
  			}
  			if (stcb->sctp_ep->sctp_lport != lport) {
  				SCTP_TCB_UNLOCK(stcb);
  				continue;
  			}
  			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
  				SCTP_TCB_UNLOCK(stcb);
  				continue;
  			}
  			/* RRS:Need toaddr check here */
  			if (sctp_does_stcb_own_this_addr(stcb, to) == 0) {
  			        /* Endpoint does not own this address */
  				SCTP_TCB_UNLOCK(stcb);
  				continue;
  			}
  			if (remote_tag) {
  				/* If we have both vtags that's all we match on */
  				if (stcb->asoc.peer_vtag == remote_tag) {
  					/* If both tags match we consider it conclusive
  					 * and check NO source/destination addresses
  					 */
  					goto conclusive;
  				}
  			}
  			if (skip_src_check) {
  			conclusive:
  			        if (from) {
  					*netp = sctp_findnet(stcb, from);
  				} else {
  					*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 offset,
      struct sockaddr *src, struct sockaddr *dst,
      struct sctphdr *sh, struct sctp_chunkhdr *ch,
      struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint32_t vrf_id)
  {
  	struct sctp_tcb *stcb;
  	struct sctp_inpcb *inp;
  
  	if (sh->v_tag) {
  		/* we only go down this path if vtag is non-zero */
  		stcb = sctp_findassoc_by_vtag(src, dst, ntohl(sh->v_tag),
  		                              inp_p, netp, sh->src_port, sh->dest_port, 0, vrf_id, 0);
  		if (stcb) {
  			return (stcb);
  		}
  	}
  
  	if (inp_p) {
  		stcb = sctp_findassociation_addr_sa(src, dst, inp_p, netp,
  		                                    1, vrf_id);
  		inp = *inp_p;
  	} else {
  		stcb = sctp_findassociation_addr_sa(src, dst, &inp, netp,
  		                                    1, vrf_id);
  	}
  	SCTPDBG(SCTP_DEBUG_PCB1, "stcb:%p inp:%p\n", (void *)stcb, (void *)inp);
  	if (stcb == 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 listener before examining the
  			 * TCP pool.
  			 */
  			if (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) {
  				if (inp_p) {
  					*inp_p = NULL;
  				}
  				return (NULL);
  			}
  			stcb = sctp_findassociation_special_addr(m,
  			    offset, sh, &inp, netp, dst);
  			if (inp_p != NULL) {
  				*inp_p = inp;
  			}
  		}
  	}
  	SCTPDBG(SCTP_DEBUG_PCB1, "stcb is %p\n", (void *)stcb);
  	return (stcb);
  }
  
  /*
   * 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 offset,
  			       struct sockaddr *dst, struct sctphdr *sh,
                                 struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint32_t vrf_id)
  {
  	struct sctp_tcb *stcb;
  	union sctp_sockstore remote_store;
  	struct sctp_paramhdr param_buf, *phdr;
  	int ptype;
  	int zero_address = 0;
  #ifdef INET
  	struct sockaddr_in *sin;
  #endif
  #ifdef INET6
  	struct sockaddr_in6 *sin6;
  #endif
  
  	memset(&remote_store, 0, sizeof(remote_store));
  	phdr = sctp_get_next_param(m, offset + sizeof(struct sctp_asconf_chunk),
  				   &param_buf, sizeof(struct sctp_paramhdr));
  	if (phdr == NULL) {
  		SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf lookup addr\n",
  			__func__);
  		return NULL;
  	}
  	ptype = (int)((uint32_t) ntohs(phdr->param_type));
  	/* get the correlation address */
  	switch (ptype) {
  #ifdef INET6
  	case 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_buf));
  		if (p6 == NULL) {
  			SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf v6 lookup addr\n",
  				__func__);
  			return (NULL);
  		}
  		sin6 = &remote_store.sin6;
  		sin6->sin6_family = AF_INET6;
  #ifdef HAVE_SIN6_LEN
  		sin6->sin6_len = sizeof(*sin6);
  #endif
  		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;
  		break;
  	}
  #endif
  #ifdef INET
  	case 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_buf));
  		if (p4 == NULL) {
  			SCTPDBG(SCTP_DEBUG_INPUT3, "%s: failed to get asconf v4 lookup addr\n",
  				__func__);
  			return (NULL);
  		}
  		sin = &remote_store.sin;
  		sin->sin_family = AF_INET;
  #ifdef HAVE_SIN_LEN
  		sin->sin_len = sizeof(*sin);
  #endif
  		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;
  		break;
  	}
  #endif
  	default:
  		/* invalid address param type */
  		return NULL;
  	}
  
  	if (zero_address) {
  	        stcb = sctp_findassoc_by_vtag(NULL, dst, ntohl(sh->v_tag), inp_p,
  					      netp, sh->src_port, sh->dest_port, 1, vrf_id, 0);
  		if (stcb != NULL) {
  			SCTP_INP_DECR_REF(*inp_p);
  		}
  	} else {
  		stcb = sctp_findassociation_ep_addr(inp_p,
  		    &remote_store.sa, netp,
  		    dst, 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(SCTP_BASE_INFO(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 */
  	memset(inp, 0, sizeof(*inp));
  
  	/* bump generations */
  #if defined(__APPLE__) && !defined(__Userspace__)
  	inp->ip_inp.inp.inp_state = INPCB_STATE_INUSE;
  #endif
  	/* setup socket pointers */
  	inp->sctp_socket = so;
  	inp->ip_inp.inp.inp_socket = so;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	inp->ip_inp.inp.inp_cred = crhold(so->so_cred);
  #endif
  #ifdef INET6
  #if !defined(__Userspace__) && !defined(_WIN32)
  	if (INP_SOCKAF(so) == AF_INET6) {
  		if (MODULE_GLOBAL(ip6_auto_flowlabel)) {
  			inp->ip_inp.inp.inp_flags |= IN6P_AUTOFLOWLABEL;
  		}
  		if (MODULE_GLOBAL(ip6_v6only)) {
  			inp->ip_inp.inp.inp_flags |= IN6P_IPV6_V6ONLY;
  		}
  	}
  #endif
  #endif
  	inp->sctp_associd_counter = 1;
  	inp->partial_delivery_point = SCTP_SB_LIMIT_RCV(so) >> SCTP_PARTIAL_DELIVERY_SHIFT;
  	inp->sctp_frag_point = SCTP_DEFAULT_MAXSEGMENT;
  	inp->max_cwnd = 0;
  	inp->sctp_cmt_on_off = SCTP_BASE_SYSCTL(sctp_cmt_on_off);
  	inp->ecn_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_ecn_enable);
  	inp->prsctp_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_pr_enable);
  	inp->auth_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_auth_enable);
  	inp->asconf_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_asconf_enable);
  	inp->reconfig_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_reconfig_enable);
  	inp->nrsack_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_nrsack_enable);
  	inp->pktdrop_supported = (uint8_t)SCTP_BASE_SYSCTL(sctp_pktdrop_enable);
  	inp->idata_supported = 0;
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	inp->fibnum = so->so_fibnum;
  #else
  	inp->fibnum = 0;
  #endif
  #if defined(__Userspace__)
  	inp->ulp_info = NULL;
  	inp->recv_callback = NULL;
  	inp->send_callback = NULL;
  	inp->send_sb_threshold = 0;
  #endif
  	/* init the small hash table we use to track asocid <-> tcb */
  	inp->sctp_asocidhash = SCTP_HASH_INIT(SCTP_STACK_VTAG_HASH_SIZE, &inp->hashasocidmark);
  	if (inp->sctp_asocidhash == NULL) {
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  		crfree(inp->ip_inp.inp.inp_cred);
  #endif
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
  		SCTP_INP_INFO_WUNLOCK();
  		return (ENOBUFS);
  	}
  	SCTP_INCR_EP_COUNT();
  	inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  	SCTP_INP_INFO_WUNLOCK();
  
  	so->so_pcb = (caddr_t)inp;
  
  	if (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 */
  		SOCK_LOCK(so);
  		SCTP_CLEAR_SO_NBIO(so);
  		SOCK_UNLOCK(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);
  		so->so_pcb = NULL;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  		crfree(inp->ip_inp.inp.inp_cred);
  #endif
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
  		return (EOPNOTSUPP);
  	}
  	if (SCTP_BASE_SYSCTL(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_BASE_SYSCTL(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_BASE_SYSCTL(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_BASE_SYSCTL(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);
  		so->so_pcb = NULL;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  		crfree(inp->ip_inp.inp.inp_cred);
  #endif
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
  		return (ENOBUFS);
  	}
  #ifdef SCTP_MVRF
  	inp->vrf_size = SCTP_DEFAULT_VRF_SIZE;
  	SCTP_MALLOC(inp->m_vrf_ids, uint32_t *,
  		    (sizeof(uint32_t) * inp->vrf_size), SCTP_M_MVRF);
  	if (inp->m_vrf_ids == NULL) {
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOBUFS);
  		so->so_pcb = NULL;
  		SCTP_HASH_FREE(inp->sctp_tcbhash, inp->sctp_hashmark);
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  		crfree(inp->ip_inp.inp.inp_cred);
  #endif
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
  		return (ENOBUFS);
  	}
  	inp->m_vrf_ids[0] = vrf_id;
  	inp->num_vrfs = 1;
  #endif
  	inp->def_vrf_id = vrf_id;
  
  #if defined(__APPLE__) && !defined(__Userspace__)
  #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
  	inp->ip_inp.inp.inpcb_mtx = lck_mtx_alloc_init(SCTP_BASE_INFO(sctbinfo).mtx_grp, SCTP_BASE_INFO(sctbinfo).mtx_attr);
  	if (inp->ip_inp.inp.inpcb_mtx == NULL) {
  		SCTP_PRINTF("in_pcballoc: can't alloc mutex! so=%p\n", (void *)so);
  #ifdef SCTP_MVRF
  		SCTP_FREE(inp->m_vrf_ids, SCTP_M_MVRF);
  #endif
  		SCTP_HASH_FREE(inp->sctp_tcbhash, inp->sctp_hashmark);
  		so->so_pcb = NULL;
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
  		SCTP_UNLOCK_EXC(SCTP_BASE_INFO(sctbinfo).ipi_lock);
  		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, ENOMEM);
  		return (ENOMEM);
  	}
  #elif defined(APPLE_LION) || defined(APPLE_MOUNTAINLION)
  	lck_mtx_init(&inp->ip_inp.inp.inpcb_mtx, SCTP_BASE_INFO(sctbinfo).mtx_grp, SCTP_BASE_INFO(sctbinfo).mtx_attr);
  #else
  	lck_mtx_init(&inp->ip_inp.inp.inpcb_mtx, SCTP_BASE_INFO(sctbinfo).ipi_lock_grp, SCTP_BASE_INFO(sctbinfo).ipi_lock_attr);
  #endif
  #endif
  	SCTP_INP_INFO_WLOCK();
  	SCTP_INP_LOCK_INIT(inp);
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	INP_LOCK_INIT(&inp->ip_inp.inp, "inp", "sctpinp");
  #endif
  	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(&SCTP_BASE_INFO(listhead), inp, sctp_list);
  #if defined(__APPLE__) && !defined(__Userspace__)
  	inp->ip_inp.inp.inp_pcbinfo = &SCTP_BASE_INFO(sctbinfo);
  #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD) || defined(APPLE_LION) || defined(APPLE_MOUNTAINLION)
  	LIST_INSERT_HEAD(SCTP_BASE_INFO(sctbinfo).listhead, &inp->ip_inp.inp, inp_list);
  #else
  	LIST_INSERT_HEAD(SCTP_BASE_INFO(sctbinfo).ipi_listhead, &inp->ip_inp.inp, inp_list);
  #endif
  #endif
  	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] = sctp_secs_to_ticks(SCTP_SEND_SEC);	/* needed ? */
  	m->sctp_timeoutticks[SCTP_TIMER_INIT] = sctp_secs_to_ticks(SCTP_INIT_SEC);	/* needed ? */
  	m->sctp_timeoutticks[SCTP_TIMER_RECV] = sctp_msecs_to_ticks(SCTP_BASE_SYSCTL(sctp_delayed_sack_time_default));
  	m->sctp_timeoutticks[SCTP_TIMER_HEARTBEAT] = sctp_msecs_to_ticks(SCTP_BASE_SYSCTL(sctp_heartbeat_interval_default));
  	m->sctp_timeoutticks[SCTP_TIMER_PMTU] = sctp_secs_to_ticks(SCTP_BASE_SYSCTL(sctp_pmtu_raise_time_default));
  	m->sctp_timeoutticks[SCTP_TIMER_MAXSHUTDOWN] = sctp_secs_to_ticks(SCTP_BASE_SYSCTL(sctp_shutdown_guard_time_default));
  	m->sctp_timeoutticks[SCTP_TIMER_SIGNATURE] = sctp_secs_to_ticks(SCTP_BASE_SYSCTL(sctp_secret_lifetime_default));
  	/* all max/min max are in ms */
  	m->sctp_maxrto = SCTP_BASE_SYSCTL(sctp_rto_max_default);
  	m->sctp_minrto = SCTP_BASE_SYSCTL(sctp_rto_min_default);
  	m->initial_rto = SCTP_BASE_SYSCTL(sctp_rto_initial_default);
  	m->initial_init_rto_max = SCTP_BASE_SYSCTL(sctp_init_rto_max_default);
  	m->sctp_sack_freq = SCTP_BASE_SYSCTL(sctp_sack_freq_default);
  	m->max_init_times = SCTP_BASE_SYSCTL(sctp_init_rtx_max_default);
  	m->max_send_times = SCTP_BASE_SYSCTL(sctp_assoc_rtx_max_default);
  	m->def_net_failure = SCTP_BASE_SYSCTL(sctp_path_rtx_max_default);
  	m->def_net_pf_threshold = SCTP_BASE_SYSCTL(sctp_path_pf_threshold);
  	m->sctp_sws_sender = SCTP_SWS_SENDER_DEF;
  	m->sctp_sws_receiver = SCTP_SWS_RECEIVER_DEF;
  	m->max_burst = SCTP_BASE_SYSCTL(sctp_max_burst_default);
  	m->fr_max_burst = SCTP_BASE_SYSCTL(sctp_fr_max_burst_default);
  
  	m->sctp_default_cc_module = SCTP_BASE_SYSCTL(sctp_default_cc_module);
  	m->sctp_default_ss_module = SCTP_BASE_SYSCTL(sctp_default_ss_module);
  	m->max_open_streams_intome = SCTP_BASE_SYSCTL(sctp_nr_incoming_streams_default);
  	/* number of streams to pre-open on a association */
  	m->pre_open_stream_count = SCTP_BASE_SYSCTL(sctp_nr_outgoing_streams_default);
  
  	m->default_mtu = 0;
  	/* Add adaptation cookie */
  	m->adaptation_layer_indicator = 0;
  	m->adaptation_layer_indicator_provided = 0;
  
  	/* 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 = sctp_msecs_to_ticks(SCTP_BASE_SYSCTL(sctp_valid_cookie_life_default));
  	/*
  	 * Initialize authentication parameters
  	 */
  	m->local_hmacs = sctp_default_supported_hmaclist();
  	m->local_auth_chunks = sctp_alloc_chunklist();
  	if (inp->asconf_supported) {
  		sctp_auth_add_chunk(SCTP_ASCONF, m->local_auth_chunks);
  		sctp_auth_add_chunk(SCTP_ASCONF_ACK, m->local_auth_chunks);
  	}
  	m->default_dscp = 0;
  #ifdef INET6
  	m->default_flowlabel = 0;
  #endif
  	m->port = 0; /* encapsulation disabled by default */
  	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);
  	if (stcb->asoc.in_asocid_hash) {
  		LIST_REMOVE(stcb, sctp_tcbasocidhash);
  	}
  	/* Now insert the new_inp into the TCP connected hash */
  	head = &SCTP_BASE_INFO(sctp_tcpephash)[SCTP_PCBHASH_ALLADDR((lport | rport), SCTP_BASE_INFO(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.
  	 */
  	if (stcb->asoc.in_asocid_hash) {
  		struct sctpasochead *lhd;
  		lhd = &new_inp->sctp_asocidhash[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id,
  			new_inp->hashasocidmark)];
  		LIST_INSERT_HEAD(lhd, stcb, sctp_tcbasocidhash);
  	}
  	/* 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(SCTP_BASE_INFO(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();
  			memset(laddr, 0, 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++;
  			if (oladdr == stcb->asoc.last_used_address) {
  				stcb->asoc.last_used_address = laddr;
  			}
  		}
  	}
  	/* Now any running timers need to be adjusted. */
  	if (stcb->asoc.dack_timer.ep == old_inp) {
  		SCTP_INP_DECR_REF(old_inp);
  		stcb->asoc.dack_timer.ep = new_inp;
  		SCTP_INP_INCR_REF(new_inp);
  	}
  	if (stcb->asoc.asconf_timer.ep == old_inp) {
  		SCTP_INP_DECR_REF(old_inp);
  		stcb->asoc.asconf_timer.ep = new_inp;
  		SCTP_INP_INCR_REF(new_inp);
  	}
  	if (stcb->asoc.strreset_timer.ep == old_inp) {
  		SCTP_INP_DECR_REF(old_inp);
  		stcb->asoc.strreset_timer.ep = new_inp;
  		SCTP_INP_INCR_REF(new_inp);
  	}
  	if (stcb->asoc.shut_guard_timer.ep == old_inp) {
  		SCTP_INP_DECR_REF(old_inp);
  		stcb->asoc.shut_guard_timer.ep = new_inp;
  		SCTP_INP_INCR_REF(new_inp);
  	}
  	if (stcb->asoc.autoclose_timer.ep == old_inp) {
  		SCTP_INP_DECR_REF(old_inp);
  		stcb->asoc.autoclose_timer.ep = new_inp;
  		SCTP_INP_INCR_REF(new_inp);
  	}
  	if (stcb->asoc.delete_prim_timer.ep == old_inp) {
  		SCTP_INP_DECR_REF(old_inp);
  		stcb->asoc.delete_prim_timer.ep = new_inp;
  		SCTP_INP_INCR_REF(new_inp);
  	}
  	/* now what about the nets? */
  	TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  		if (net->pmtu_timer.ep == old_inp) {
  			SCTP_INP_DECR_REF(old_inp);
  			net->pmtu_timer.ep = new_inp;
  			SCTP_INP_INCR_REF(new_inp);
  		}
  		if (net->hb_timer.ep == old_inp) {
  			SCTP_INP_DECR_REF(old_inp);
  			net->hb_timer.ep = new_inp;
  			SCTP_INP_INCR_REF(new_inp);
  		}
  		if (net->rxt_timer.ep == old_inp) {
  			SCTP_INP_DECR_REF(old_inp);
  			net->rxt_timer.ep = new_inp;
  			SCTP_INP_INCR_REF(new_inp);
  		}
  	}
  	SCTP_INP_WUNLOCK(new_inp);
  	SCTP_INP_WUNLOCK(old_inp);
  }
  
  /*
   * insert an laddr entry with the given ifa for the desired list
   */
  static int
  sctp_insert_laddr(struct sctpladdr *list, struct sctp_ifa *ifa, uint32_t act)
  {
  	struct sctp_laddr *laddr;
  
  	laddr = SCTP_ZONE_GET(SCTP_BASE_INFO(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();
  	memset(laddr, 0, 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)
   */
  static 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(SCTP_BASE_INFO(ipi_zone_laddr), laddr);
  	SCTP_DECR_LADDR_COUNT();
  }
  #if !(defined(__FreeBSD__) || defined(__APPLE__) || defined(__Userspace__))
  
  /*
   * Don't know why, but without this there is an unknown reference when
   * compiling NetBSD... hmm
   */
  extern void in6_sin6_2_sin(struct sockaddr_in *, struct sockaddr_in6 *sin6);
  #endif
  
  /* sctp_ifap is used to bypass normal local address validation checks */
  int
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  sctp_inpcb_bind(struct socket *so, struct sockaddr *addr,
                  struct sctp_ifa *sctp_ifap, struct thread *p)
  #elif defined(_WIN32) && !defined(__Userspace__)
  sctp_inpcb_bind(struct socket *so, struct sockaddr *addr,
                  struct sctp_ifa *sctp_ifap, PKTHREAD p)
  #else
  sctp_inpcb_bind(struct socket *so, struct sockaddr *addr,
                  struct sctp_ifa *sctp_ifap, struct proc *p)
  #endif
  {
  	/* bind a ep to a socket address */
  	struct sctppcbhead *head;
  	struct sctp_inpcb *inp, *inp_tmp;
  #if (defined(__FreeBSD__) || defined(__APPLE__)) && !defined(__Userspace__)
  	struct inpcb *ip_inp;
  #endif
  	int port_reuse_active = 0;
  	int bindall;
  #ifdef SCTP_MVRF
  	int i;
  #endif
  	uint16_t lport;
  	int error;
  	uint32_t vrf_id;
  
  	lport = 0;
  	bindall = 1;
  	inp = (struct sctp_inpcb *)so->so_pcb;
  #if (defined(__FreeBSD__) || defined(__APPLE__)) && !defined(__Userspace__)
  	ip_inp = (struct inpcb *)so->so_pcb;
  #endif
  #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);
  	}
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #ifdef INVARIANTS
  	if (p == NULL)
  		panic("null proc/thread");
  #endif
  #endif
  	if (addr != NULL) {
  		switch (addr->sa_family) {
  #ifdef INET
  		case AF_INET:
  		{
  			struct sockaddr_in *sin;
  
  			/* IPV6_V6ONLY socket? */
  			if (SCTP_IPV6_V6ONLY(inp)) {
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
  				return (EINVAL);
  			}
  #ifdef HAVE_SA_LEN
  			if (addr->sa_len != sizeof(*sin)) {
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
  				return (EINVAL);
  			}
  #endif
  
  			sin = (struct sockaddr_in *)addr;
  			lport = sin->sin_port;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  			/*
  			 * For LOOPBACK the prison_local_ip4() call will transmute the ip address
  			 * to the proper value.
  			 */
  			if (p && (error = prison_local_ip4(p->td_ucred, &sin->sin_addr)) != 0) {
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
  				return (error);
  			}
  #endif
  			if (sin->sin_addr.s_addr != INADDR_ANY) {
  				bindall = 0;
  			}
  			break;
  		}
  #endif
  #ifdef INET6
  		case AF_INET6:
  		{
  			/* Only for pure IPv6 Address. (No IPv4 Mapped!) */
  			struct sockaddr_in6 *sin6;
  
  			sin6 = (struct sockaddr_in6 *)addr;
  
  #ifdef HAVE_SA_LEN
  			if (addr->sa_len != sizeof(*sin6)) {
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
  				return (EINVAL);
  			}
  #endif
  			lport = sin6->sin6_port;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  			/*
  			 * For LOOPBACK the prison_local_ip6() call will transmute the ipv6 address
  			 * to the proper value.
  			 */
  			if (p && (error = prison_local_ip6(p->td_ucred, &sin6->sin6_addr,
  			    (SCTP_IPV6_V6ONLY(inp) != 0))) != 0) {
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
  				return (error);
  			}
  #endif
  			if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  				bindall = 0;
  #ifdef SCTP_EMBEDDED_V6_SCOPE
  				/* KAME hack: embed scopeid */
  #if defined(SCTP_KAME)
  				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
  					SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
  					return (EINVAL);
  				}
  #elif defined(__APPLE__) && !defined(__Userspace__)
  #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
  				if (in6_embedscope(&sin6->sin6_addr, sin6, ip_inp, NULL) != 0) {
  #else
  				if (in6_embedscope(&sin6->sin6_addr, sin6, ip_inp, NULL, NULL) != 0) {
  #endif
  					SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
  					return (EINVAL);
  				}
  #elif defined(__FreeBSD__) && !defined(__Userspace__)
  				error = scope6_check_id(sin6, MODULE_GLOBAL(ip6_use_defzone));
  				if (error != 0) {
  					SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, error);
  					return (error);
  				}
  #else
  				if (in6_embedscope(&sin6->sin6_addr, sin6) != 0) {
  					SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
  					return (EINVAL);
  				}
  #endif
  #endif /* SCTP_EMBEDDED_V6_SCOPE */
  			}
  #ifndef SCOPEDROUTING
  			/* this must be cleared for ifa_ifwithaddr() */
  			sin6->sin6_scope_id = 0;
  #endif /* SCOPEDROUTING */
  			break;
  		}
  #endif
  #if defined(__Userspace__)
  		case AF_CONN:
  		{
  			struct sockaddr_conn *sconn;
  
  #ifdef HAVE_SA_LEN
  			if (addr->sa_len != sizeof(struct sockaddr_conn)) {
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
  				return (EINVAL);
  			}
  #endif
  			sconn = (struct sockaddr_conn *)addr;
  			lport = sconn->sconn_port;
  			if (sconn->sconn_addr != NULL) {
  				bindall = 0;
  			}
  			break;
  		}
  #endif
  		default:
  			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 an ep
  		 * already has this one bound.
  		 */
  		/* got to be root to get at low ports */
  #if !(defined(_WIN32) && !defined(__Userspace__))
  		if (ntohs(lport) < IPPORT_RESERVED) {
  			if ((p != NULL) && ((error =
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  				  priv_check(p, PRIV_NETINET_RESERVEDPORT)
  #elif defined(__APPLE__) && !defined(__Userspace__)
  				  suser(p->p_ucred, &p->p_acflag)
  #elif defined(__Userspace__) /* must be true to use raw socket */
  				  1
  #else
  				  suser(p, 0)
  #endif
  				    ) != 0)) {
  				SCTP_INP_DECR_REF(inp);
  				SCTP_INP_WUNLOCK(inp);
  				SCTP_INP_INFO_WUNLOCK();
  				return (error);
  			}
  		}
  #endif
  		SCTP_INP_WUNLOCK(inp);
  		if (bindall) {
  #ifdef SCTP_MVRF
  			for (i = 0; i < inp->num_vrfs; i++) {
  				vrf_id = inp->m_vrf_ids[i];
  #else
  				vrf_id = inp->def_vrf_id;
  #endif
  				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);
  					/* unlock info */
  					if ((sctp_is_feature_on(inp, SCTP_PCB_FLAGS_PORTREUSE)) &&
  					    (sctp_is_feature_on(inp_tmp, SCTP_PCB_FLAGS_PORTREUSE))) {
  						/* Ok, must be one-2-one and allowing port re-use */
  						port_reuse_active = 1;
  						goto continue_anyway;
  					}
  					SCTP_INP_DECR_REF(inp);
  					SCTP_INP_INFO_WUNLOCK();
  					SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EADDRINUSE);
  					return (EADDRINUSE);
  				}
  #ifdef SCTP_MVRF
  			}
  #endif
  		} 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);
  				/* unlock info */
  				if ((sctp_is_feature_on(inp, SCTP_PCB_FLAGS_PORTREUSE)) &&
  				    (sctp_is_feature_on(inp_tmp, SCTP_PCB_FLAGS_PORTREUSE))) {
  					/* Ok, must be one-2-one and allowing port re-use */
  					port_reuse_active = 1;
  					goto continue_anyway;
  				}
  				SCTP_INP_DECR_REF(inp);
  				SCTP_INP_INFO_WUNLOCK();
  				SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EADDRINUSE);
  				return (EADDRINUSE);
  			}
  		}
  	continue_anyway:
  		SCTP_INP_WLOCK(inp);
  		if (bindall) {
  			/* verify that no lport is not used by a singleton */
  			if ((port_reuse_active == 0) &&
  			    (inp_tmp = sctp_isport_inuse(inp, lport, vrf_id))) {
  				/* Sorry someone already has this one bound */
  				if ((sctp_is_feature_on(inp, SCTP_PCB_FLAGS_PORTREUSE)) &&
  				    (sctp_is_feature_on(inp_tmp, SCTP_PCB_FLAGS_PORTREUSE))) {
  					port_reuse_active = 1;
  				} else {
  					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 defined(_WIN32) && !defined(__Userspace__)
  		first = 1;
  		last = 0xffff;
  #else
  #if defined(__Userspace__)
  		/* TODO ensure uid is 0, etc... */
  #elif (defined(__FreeBSD__) || defined(__APPLE__)) && !defined(__Userspace__)
  		if (ip_inp->inp_flags & INP_HIGHPORT) {
  			first = MODULE_GLOBAL(ipport_hifirstauto);
  			last = MODULE_GLOBAL(ipport_hilastauto);
  		} else if (ip_inp->inp_flags & INP_LOWPORT) {
  			if (p && (error =
  #if defined(__FreeBSD__)
  				  priv_check(p, PRIV_NETINET_RESERVEDPORT)
  #elif defined(__APPLE__)
  				  suser(p->p_ucred, &p->p_acflag)
  #else
  				  suser(p, 0)
  #endif
  				    )) {
  				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 = MODULE_GLOBAL(ipport_lowfirstauto);
  			last = MODULE_GLOBAL(ipport_lowlastauto);
  		} else {
  #endif
  			first = MODULE_GLOBAL(ipport_firstauto);
  			last = MODULE_GLOBAL(ipport_lastauto);
  #if (defined(__FreeBSD__) || defined(__APPLE__)) && !defined(__Userspace__)
  		}
  #endif
  #endif
  		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) {
  #ifdef SCTP_MVRF
  			for (i = 0; i < inp->num_vrfs; i++) {
  				if (sctp_isport_inuse(inp, htons(candidate), inp->m_vrf_ids[i]) != NULL) {
  					break;
  				}
  			}
  			if (i == inp->num_vrfs) {
  				done = 1;
  			}
  #else
  			if (sctp_isport_inuse(inp, htons(candidate), inp->def_vrf_id) == NULL) {
  				done = 1;
  			}
  #endif
  			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_BASE_SYSCTL(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);
  		}
  		if (SCTP_BASE_SYSCTL(sctp_multiple_asconfs) == 0) {
  			sctp_feature_off(inp, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS);
  		} else {
  			sctp_feature_on(inp, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS);
  		}
  		/* set the automatic mobility_base from kernel
  		   flag (by micchie)
  		*/
  		if (SCTP_BASE_SYSCTL(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_BASE_SYSCTL(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;
  		union sctp_sockstore store;
  
  		memset(&store, 0, sizeof(store));
  		switch (addr->sa_family) {
  #ifdef INET
  		case AF_INET:
  			memcpy(&store.sin, addr, sizeof(struct sockaddr_in));
  			store.sin.sin_port = 0;
  			break;
  #endif
  #ifdef INET6
  		case AF_INET6:
  			memcpy(&store.sin6, addr, sizeof(struct sockaddr_in6));
  			store.sin6.sin6_port = 0;
  			break;
  #endif
  #if defined(__Userspace__)
  		case AF_CONN:
  			memcpy(&store.sconn, addr, sizeof(struct sockaddr_conn));
  			store.sconn.sconn_port = 0;
  			break;
  #endif
  		default:
  			break;
  		}
  		/*
  		 * 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.
  			 */
  			ifa = sctp_find_ifa_by_addr(&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);
  		}
  #ifdef INET6
  		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);
  			}
  		}
  #endif
  		/* 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 */
  	if (port_reuse_active) {
  		/* Put it into tcp 1-2-1 hash */
  		head = &SCTP_BASE_INFO(sctp_tcpephash)[SCTP_PCBHASH_ALLADDR(lport, SCTP_BASE_INFO(hashtcpmark))];
  		inp->sctp_flags |= SCTP_PCB_FLAGS_IN_TCPPOOL;
  	} else {
  		head = &SCTP_BASE_INFO(sctp_ephash)[SCTP_PCBHASH_ALLADDR(lport, SCTP_BASE_INFO(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 - in tcp_pool=%d\n",
  		(void *)head, ntohs(lport), port_reuse_active);
  	/* 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_iterator *it, *nit;
  
  	/*
  	 * We enter with the only the ITERATOR_LOCK in place and a write
  	 * lock on the inp_info stuff.
  	 */
  	it = sctp_it_ctl.cur_it;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	if (it && (it->vn != curvnet)) {
  		/* Its not looking at our VNET */
  		return;
  	}
  #endif
  	if (it && (it->inp == inp)) {
  		/*
  		 * This is tricky and we hold the iterator lock,
  		 * but when it returns and gets the lock (when we
  		 * release it) the iterator will try to operate on
  		 * inp. We need to stop that from happening. But
  		 * of course the iterator has a reference on the
  		 * stcb and inp. We can mark it and it will stop.
  		 *
  		 * If its a single iterator situation, we
  		 * set the end iterator flag. Otherwise
  		 * we set the iterator to go to the next inp.
  		 *
  		 */
  		if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
  			sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_STOP_CUR_IT;
  		} else {
  			sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_STOP_CUR_INP;
  		}
  	}
  	/* Now go through and remove any single reference to
  	 * our inp that may be still pending on the list
  	 */
  	SCTP_IPI_ITERATOR_WQ_LOCK();
  	TAILQ_FOREACH_SAFE(it, &sctp_it_ctl.iteratorhead, sctp_nxt_itr, nit) {
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  		if (it->vn != curvnet) {
  			continue;
  		}
  #endif
  		if (it->inp == inp) {
  			/* This one points to me is it inp specific? */
  			if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
  				/* Remove and free this one */
  				TAILQ_REMOVE(&sctp_it_ctl.iteratorhead,
  				    it, sctp_nxt_itr);
  				if (it->function_atend != NULL) {
  					(*it->function_atend) (it->pointer, it->val);
  				}
  				SCTP_FREE(it, SCTP_M_ITER);
  			} else {
  				it->inp = LIST_NEXT(it->inp, sctp_list);
  				if (it->inp) {
  					SCTP_INP_INCR_REF(it->inp);
  				}
  			}
  			/* When its put in the refcnt is incremented so decr it */
  			SCTP_INP_DECR_REF(inp);
  		}
  	}
  	SCTP_IPI_ITERATOR_WQ_UNLOCK();
  }
  
  /* 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_tcb *asoc, *nasoc;
  	struct sctp_laddr *laddr, *nladdr;
  	struct inpcb *ip_pcb;
  	struct socket *so;
  	int being_refed = 0;
  	struct sctp_queued_to_read *sq, *nsq;
  #if !defined(__Userspace__)
  #if !defined(__FreeBSD__)
  	sctp_rtentry_t *rt;
  #endif
  #endif
  	int cnt;
  	sctp_sharedkey_t *shared_key, *nshared_key;
  
  #if defined(__APPLE__) && !defined(__Userspace__)
  	sctp_lock_assert(SCTP_INP_SO(inp));
  #endif
  #ifdef SCTP_LOG_CLOSING
  	sctp_log_closing(inp, NULL, 0);
  #endif
  	SCTP_ITERATOR_LOCK();
  	/* mark any iterators on the list or being processed */
  	sctp_iterator_inp_being_freed(inp);
  	SCTP_ITERATOR_UNLOCK();
  	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);
  #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);
  	if (from == SCTP_CALLED_AFTER_CMPSET_OFCLOSE) {
  		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;
  	}
  	/* First time through we have the socket lock, after that no more. */
  	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;
  	}
  	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;
  		LIST_FOREACH_SAFE(asoc, &inp->sctp_asoc_list, sctp_tcblist, nasoc) {
  			SCTP_TCB_LOCK(asoc);
  			if (asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
  				/* Skip guys being freed */
  				cnt_in_sd++;
  				if (asoc->asoc.state & SCTP_STATE_IN_ACCEPT_QUEUE) {
  					/*
  					 * Special case - we did not start a kill
  					 * timer on the asoc due to it was not
  					 * closed. So go ahead and start it now.
  					 */
  					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_IN_ACCEPT_QUEUE);
  					sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, asoc, NULL);
  				}
  				SCTP_TCB_UNLOCK(asoc);
  				continue;
  			}
  			if (((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
  			     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) &&
  			    (asoc->asoc.total_output_queue_size == 0)) {
  				/* 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;
  			SCTP_ADD_SUBSTATE(asoc, 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_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
  				asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_3;
  				sctp_send_abort_tcb(asoc, op_err, SCTP_SO_LOCKED);
  				SCTP_STAT_INCR_COUNTER32(sctps_aborted);
  				if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
  				    (SCTP_GET_STATE(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.ss_functions.sctp_ss_is_user_msgs_incomplete)(asoc, &asoc->asoc)) {
  					goto abort_anyway;
  				}
  				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
  				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
  					struct sctp_nets *netp;
  
  					/*
  					 * there is nothing queued to send,
  					 * so I send shutdown
  					 */
  					if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
  					    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  					}
  					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
  					sctp_stop_timers_for_shutdown(asoc);
  					if (asoc->asoc.alternate) {
  						netp = asoc->asoc.alternate;
  					} else {
  						netp = asoc->asoc.primary_destination;
  					}
  					sctp_send_shutdown(asoc, netp);
  					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, asoc->sctp_ep, asoc,
  					    netp);
  					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, asoc->sctp_ep, asoc, NULL);
  					sctp_chunk_output(inp, asoc, SCTP_OUTPUT_FROM_SHUT_TMR, SCTP_SO_LOCKED);
  				}
  			} else {
  				/* mark into shutdown pending */
  				SCTP_ADD_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, asoc->sctp_ep, asoc, NULL);
  				if ((*asoc->asoc.ss_functions.sctp_ss_is_user_msgs_incomplete)(asoc, &asoc->asoc)) {
  					SCTP_ADD_SUBSTATE(asoc, 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_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
  					asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_5;
  					sctp_send_abort_tcb(asoc, op_err, SCTP_SO_LOCKED);
  					SCTP_STAT_INCR_COUNTER32(sctps_aborted);
  					if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
  					    (SCTP_GET_STATE(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) {
  #ifdef SCTP_LOG_CLOSING
  			sctp_log_closing(inp, NULL, 2);
  #endif
  			inp->sctp_socket = NULL;
  			SCTP_INP_WUNLOCK(inp);
  			SCTP_ASOC_CREATE_UNLOCK(inp);
  			SCTP_INP_INFO_WUNLOCK();
  			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 SCTP_BASE_INFO(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;
  	LIST_FOREACH_SAFE(asoc, &inp->sctp_asoc_list, sctp_tcblist, nasoc) {
  		SCTP_TCB_LOCK(asoc);
  		if (immediate != SCTP_FREE_SHOULD_USE_GRACEFUL_CLOSE) {
  			/* Disconnect the socket please */
  			asoc->sctp_socket = NULL;
  			SCTP_ADD_SUBSTATE(asoc, SCTP_STATE_CLOSED_SOCKET);
  		}
  		if (asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
  			if (asoc->asoc.state & SCTP_STATE_IN_ACCEPT_QUEUE) {
  				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_IN_ACCEPT_QUEUE);
  				sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, asoc, NULL);
  			}
  			cnt++;
  			SCTP_TCB_UNLOCK(asoc);
  			continue;
  		}
  		/* Free associations that are NOT killing us */
  		if ((SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
  		    ((asoc->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0)) {
  			struct mbuf *op_err;
  
  			op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
  			asoc->sctp_ep->last_abort_code = SCTP_FROM_SCTP_PCB + SCTP_LOC_7;
  			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) == SCTP_STATE_OPEN) ||
  		    (SCTP_GET_STATE(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 */
  #ifdef SCTP_LOG_CLOSING
  		sctp_log_closing(inp, NULL, 3);
  #endif
  		SCTP_INP_WUNLOCK(inp);
  		SCTP_ASOC_CREATE_UNLOCK(inp);
  		SCTP_INP_INFO_WUNLOCK();
  		return;
  	}
  	if (SCTP_INP_LOCK_CONTENDED(inp))
  		being_refed++;
  	if (SCTP_INP_READ_CONTENDED(inp))
  		being_refed++;
  	if (SCTP_ASOC_CREATE_LOCK_CONTENDED(inp))
  		being_refed++;
  	/* NOTE: 0 refcount also means no timers are referencing us. */
  	if ((inp->refcount) ||
  	    (being_refed) ||
  	    (inp->sctp_flags & SCTP_PCB_FLAGS_CLOSE_IP)) {
  #ifdef SCTP_LOG_CLOSING
  		sctp_log_closing(inp, NULL, 4);
  #endif
  		sctp_timer_start(SCTP_TIMER_TYPE_INPKILL, inp, NULL, NULL);
  		SCTP_INP_WUNLOCK(inp);
  		SCTP_ASOC_CREATE_UNLOCK(inp);
  		SCTP_INP_INFO_WUNLOCK();
  		return;
  	}
  	inp->sctp_ep.signature_change.type = 0;
  	inp->sctp_flags |= SCTP_PCB_FLAGS_SOCKET_ALLGONE;
  	/* Remove it from the list .. last thing we need a
  	 * lock for.
  	 */
  	LIST_REMOVE(inp, sctp_list);
  	SCTP_INP_WUNLOCK(inp);
  	SCTP_ASOC_CREATE_UNLOCK(inp);
  	SCTP_INP_INFO_WUNLOCK();
  
  #ifdef SCTP_LOG_CLOSING
  	sctp_log_closing(inp, NULL, 5);
  #endif
  #if !(defined(_WIN32) || defined(__Userspace__))
  #if !(defined(__FreeBSD__)  && !defined(__Userspace__))
  	rt = ip_pcb->inp_route.ro_rt;
  #endif
  #endif
  	if ((inp->sctp_asocidhash) != NULL) {
  		SCTP_HASH_FREE(inp->sctp_asocidhash, inp->hashasocidmark);
  		inp->sctp_asocidhash = NULL;
  	}
  	/*sa_ignore FREED_MEMORY*/
  	TAILQ_FOREACH_SAFE(sq, &inp->read_queue, next, nsq) {
  		/* 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_free_a_readq(NULL, sq);
  	}
  	/* 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.
  	 */
  	if (ip_pcb->inp_options) {
  		(void)sctp_m_free(ip_pcb->inp_options);
  		ip_pcb->inp_options = 0;
  	}
  #if !(defined(_WIN32) || defined(__Userspace__))
  #if !defined(__FreeBSD__)
  	if (rt) {
  		RTFREE(rt);
  		ip_pcb->inp_route.ro_rt = 0;
  	}
  #endif
  #endif
  #ifdef INET6
  #if !(defined(_WIN32) || defined(__Userspace__))
  #if (defined(__FreeBSD__) || defined(__APPLE__) && !defined(__Userspace__))
  	if (ip_pcb->inp_vflag & INP_IPV6) {
  #else
  	if (inp->inp_vflag & INP_IPV6) {
  #endif
  		ip6_freepcbopts(ip_pcb->in6p_outputopts);
  	}
  #endif
  #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);
  
  	LIST_FOREACH_SAFE(shared_key, &inp->sctp_ep.shared_keys, next, nshared_key) {
  		LIST_REMOVE(shared_key, next);
  		sctp_free_sharedkey(shared_key);
  		/*sa_ignore FREED_MEMORY*/
  	}
  
  #if defined(__APPLE__) && !defined(__Userspace__)
  	inp->ip_inp.inp.inp_state = INPCB_STATE_DEAD;
  	if (in_pcb_checkstate(&inp->ip_inp.inp, WNT_STOPUSING, 1) != WNT_STOPUSING) {
  #ifdef INVARIANTS
  		panic("sctp_inpcb_free inp = %p couldn't set to STOPUSING\n", (void *)inp);
  #else
  		SCTP_PRINTF("sctp_inpcb_free inp = %p couldn't set to STOPUSING\n", (void *)inp);
  #endif
  	}
  	inp->ip_inp.inp.inp_socket->so_flags |= SOF_PCBCLEARING;
  #endif
  	/*
  	 * 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.
  	 */
  	LIST_FOREACH_SAFE(laddr, &inp->sctp_addr_list, sctp_nxt_addr, nladdr) {
  		sctp_remove_laddr(laddr);
  	}
  
  #ifdef SCTP_TRACK_FREED_ASOCS
  	/* TEMP CODE */
  	LIST_FOREACH_SAFE(asoc, &inp->sctp_asoc_free_list, sctp_tcblist, nasoc) {
  		LIST_REMOVE(asoc, sctp_tcblist);
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), asoc);
  		SCTP_DECR_ASOC_COUNT();
  	}
  	/* *** END TEMP CODE ****/
  #endif
  #ifdef SCTP_MVRF
  	SCTP_FREE(inp->m_vrf_ids, SCTP_M_MVRF);
  #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 */
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	crfree(inp->ip_inp.inp.inp_cred);
  	INP_LOCK_DESTROY(&inp->ip_inp.inp);
  #endif
  	SCTP_INP_LOCK_DESTROY(inp);
  	SCTP_INP_READ_DESTROY(inp);
  	SCTP_ASOC_CREATE_LOCK_DESTROY(inp);
  #if !(defined(__APPLE__) && !defined(__Userspace__))
  	SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_ep), inp);
  	SCTP_DECR_EP_COUNT();
  #else
  	/* For Tiger, we will do this later... */
  #endif
  }
  
  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,
      struct sctp_nets **netp, uint16_t port, int set_scope, int from)
  {
  	/*
  	 * The following is redundant to the same lines in the
  	 * sctp_aloc_assoc() but is needed since others 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;
  	switch (newaddr->sa_family) {
  #ifdef INET
  	case 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 zero area */
  		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
  
  		/* assure len is set */
  #ifdef HAVE_SIN_LEN
  		sin->sin_len = sizeof(struct sockaddr_in);
  #endif
  		if (set_scope) {
  			if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
  				stcb->asoc.scope.ipv4_local_scope = 1;
  			}
  		} else {
  			/* Validate the address is in scope */
  			if ((IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) &&
  			    (stcb->asoc.scope.ipv4_local_scope == 0)) {
  				addr_inscope = 0;
  			}
  		}
  		break;
  	}
  #endif
  #ifdef INET6
  	case 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 */
  #ifdef HAVE_SIN6_LEN
  		sin6->sin6_len = sizeof(struct sockaddr_in6);
  #endif
  		if (set_scope) {
  			if (sctp_is_address_on_local_host(newaddr, stcb->asoc.vrf_id)) {
  				stcb->asoc.scope.loopback_scope = 1;
  				stcb->asoc.scope.local_scope = 0;
  				stcb->asoc.scope.ipv4_local_scope = 1;
  				stcb->asoc.scope.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.scope.ipv4_local_scope = 1;
  				stcb->asoc.scope.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.scope.site_scope = 1;
  			}
  		} else {
  			/* Validate the address is in scope */
  			if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr) &&
  			    (stcb->asoc.scope.loopback_scope == 0)) {
  				addr_inscope = 0;
  			} else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  			    (stcb->asoc.scope.local_scope == 0)) {
  				addr_inscope = 0;
  			} else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  			    (stcb->asoc.scope.site_scope == 0)) {
  				addr_inscope = 0;
  			}
  		}
  		break;
  	}
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  	{
  		struct sockaddr_conn *sconn;
  
  		sconn = (struct sockaddr_conn *)newaddr;
  		if (sconn->sconn_addr == NULL) {
  			/* Invalid address */
  			return (-1);
  		}
  #ifdef HAVE_SCONN_LEN
  		sconn->sconn_len = sizeof(struct sockaddr_conn);
  #endif
  		break;
  	}
  #endif
  	default:
  		/* not supported family type */
  		return (-1);
  	}
  	net = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_net), struct sctp_nets);
  	if (net == NULL) {
  		return (-1);
  	}
  	SCTP_INCR_RADDR_COUNT();
  	memset(net, 0, sizeof(struct sctp_nets));
  	(void)SCTP_GETTIME_TIMEVAL(&net->start_time);
  #ifdef HAVE_SA_LEN
  	memcpy(&net->ro._l_addr, newaddr, newaddr->sa_len);
  #endif
  	switch (newaddr->sa_family) {
  #ifdef INET
  	case AF_INET:
  #ifndef HAVE_SA_LEN
  		memcpy(&net->ro._l_addr, newaddr, sizeof(struct sockaddr_in));
  #endif
  		((struct sockaddr_in *)&net->ro._l_addr)->sin_port = stcb->rport;
  		break;
  #endif
  #ifdef INET6
  	case AF_INET6:
  #ifndef HAVE_SA_LEN
  		memcpy(&net->ro._l_addr, newaddr, sizeof(struct sockaddr_in6));
  #endif
  		((struct sockaddr_in6 *)&net->ro._l_addr)->sin6_port = stcb->rport;
  		break;
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  #ifndef HAVE_SA_LEN
  		memcpy(&net->ro._l_addr, newaddr, sizeof(struct sockaddr_conn));
  #endif
  		((struct sockaddr_conn *)&net->ro._l_addr)->sconn_port = stcb->rport;
  		break;
  #endif
  	default:
  		break;
  	}
  	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.scope.loopback_scope = 1;
  		stcb->asoc.scope.ipv4_local_scope = 1;
  		stcb->asoc.scope.local_scope = 0;
  		stcb->asoc.scope.site_scope = 1;
  		addr_inscope = 1;
  	}
  	net->failure_threshold = stcb->asoc.def_net_failure;
  	net->pf_threshold = stcb->asoc.def_net_pf_threshold;
  	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_needed = 1;
  	net->RTO = 0;
  	net->RTO_measured = 0;
  	stcb->asoc.numnets++;
  	net->ref_count = 1;
  	net->cwr_window_tsn = net->last_cwr_tsn = stcb->asoc.sending_seq - 1;
  	net->port = port;
  	net->dscp = stcb->asoc.default_dscp;
  #ifdef INET6
  	net->flowlabel = stcb->asoc.default_flowlabel;
  #endif
  	if (sctp_stcb_is_feature_on(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_DONOT_HEARTBEAT)) {
  		net->dest_state |= SCTP_ADDR_NOHB;
  	} else {
  		net->dest_state &= ~SCTP_ADDR_NOHB;
  	}
  	if (sctp_stcb_is_feature_on(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_DO_NOT_PMTUD)) {
  		net->dest_state |= SCTP_ADDR_NO_PMTUD;
  	} else {
  		net->dest_state &= ~SCTP_ADDR_NO_PMTUD;
  	}
  	net->heart_beat_delay = stcb->asoc.heart_beat_delay;
  	/* Init the timer structure */
  	SCTP_OS_TIMER_INIT(&net->rxt_timer.timer);
  	SCTP_OS_TIMER_INIT(&net->pmtu_timer.timer);
  	SCTP_OS_TIMER_INIT(&net->hb_timer.timer);
  
  	/* Now generate a route for this guy */
  #ifdef INET6
  #ifdef SCTP_EMBEDDED_V6_SCOPE
  	/* KAME hack: embed scopeid */
  	if (newaddr->sa_family == AF_INET6) {
  		struct sockaddr_in6 *sin6;
  
  		sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
  #if defined(__APPLE__) && !defined(__Userspace__)
  #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
  		(void)in6_embedscope(&sin6->sin6_addr, sin6, &stcb->sctp_ep->ip_inp.inp, NULL);
  #else
  		(void)in6_embedscope(&sin6->sin6_addr, sin6, &stcb->sctp_ep->ip_inp.inp, NULL, NULL);
  #endif
  #elif defined(SCTP_KAME)
  		(void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
  #else
  		(void)in6_embedscope(&sin6->sin6_addr, sin6);
  #endif
  #ifndef SCOPEDROUTING
  		sin6->sin6_scope_id = 0;
  #endif
  	}
  #endif /* SCTP_EMBEDDED_V6_SCOPE */
  #endif
  	SCTP_RTALLOC((sctp_route_t *)&net->ro,
  	             stcb->asoc.vrf_id,
  	             stcb->sctp_ep->fibnum);
  
  	net->src_addr_selected = 0;
  #if !defined(__Userspace__)
  	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);
  		if (stcb->asoc.default_mtu > 0) {
  			net->mtu = stcb->asoc.default_mtu;
  			switch (net->ro._l_addr.sa.sa_family) {
  #ifdef INET
  			case AF_INET:
  				net->mtu += SCTP_MIN_V4_OVERHEAD;
  				break;
  #endif
  #ifdef INET6
  			case AF_INET6:
  				net->mtu += SCTP_MIN_OVERHEAD;
  				break;
  #endif
  #if defined(__Userspace__)
  			case AF_CONN:
  				net->mtu += sizeof(struct sctphdr);
  				break;
  #endif
  			default:
  				break;
  			}
  #if defined(INET) || defined(INET6)
  			if (net->port) {
  				net->mtu += (uint32_t)sizeof(struct udphdr);
  			}
  #endif
  		} else if (net->ro._s_addr != NULL) {
  			uint32_t imtu, rmtu, hcmtu;
  
  			net->src_addr_selected = 1;
  			/* Now get the interface MTU */
  			if (net->ro._s_addr->ifn_p != NULL) {
  				imtu = SCTP_GATHER_MTU_FROM_INTFC(net->ro._s_addr->ifn_p);
  			} else {
  				imtu = 0;
  			}
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  			rmtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, net->ro.ro_nh);
  			hcmtu = sctp_hc_get_mtu(&net->ro._l_addr, stcb->sctp_ep->fibnum);
  #else
  			rmtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, net->ro.ro_rt);
  			hcmtu = 0;
  #endif
  			net->mtu = sctp_min_mtu(hcmtu, rmtu, imtu);
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #else
  			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);
  			}
  #endif
  		}
  	}
  #endif
  	if (net->mtu == 0) {
  		if (stcb->asoc.default_mtu > 0) {
  			net->mtu = stcb->asoc.default_mtu;
  			switch (net->ro._l_addr.sa.sa_family) {
  #ifdef INET
  			case AF_INET:
  				net->mtu += SCTP_MIN_V4_OVERHEAD;
  				break;
  #endif
  #ifdef INET6
  			case AF_INET6:
  				net->mtu += SCTP_MIN_OVERHEAD;
  				break;
  #endif
  #if defined(__Userspace__)
  			case AF_CONN:
  				net->mtu += sizeof(struct sctphdr);
  				break;
  #endif
  			default:
  				break;
  			}
  #if defined(INET) || defined(INET6)
  			if (net->port) {
  				net->mtu += (uint32_t)sizeof(struct udphdr);
  			}
  #endif
  		} else {
  			switch (newaddr->sa_family) {
  #ifdef INET
  			case AF_INET:
  				net->mtu = SCTP_DEFAULT_MTU;
  				break;
  #endif
  #ifdef INET6
  			case AF_INET6:
  				net->mtu = 1280;
  				break;
  #endif
  #if defined(__Userspace__)
  			case AF_CONN:
  				net->mtu = 1280;
  				break;
  #endif
  			default:
  				break;
  			}
  		}
  	}
  #if defined(INET) || defined(INET6)
  	if (net->port) {
  		net->mtu -= (uint32_t)sizeof(struct udphdr);
  	}
  #endif
  	if (from == SCTP_ALLOC_ASOC) {
  		stcb->asoc.smallest_mtu = net->mtu;
  	}
  	if (stcb->asoc.smallest_mtu > net->mtu) {
  		sctp_pathmtu_adjustment(stcb, net->mtu);
  	}
  #ifdef INET6
  #ifdef SCTP_EMBEDDED_V6_SCOPE
  	if (newaddr->sa_family == AF_INET6) {
  		struct sockaddr_in6 *sin6;
  
  		sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
  #ifdef SCTP_KAME
  		(void)sa6_recoverscope(sin6);
  #else
  		(void)in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
  #endif /* SCTP_KAME */
  	}
  #endif /* SCTP_EMBEDDED_V6_SCOPE */
  #endif
  
  	/* JRS - Use the congestion control given in the CC module */
  	if (stcb->asoc.cc_functions.sctp_set_initial_cc_param != NULL)
  		(*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;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	/* Choose an initial flowid. */
  	net->flowid = stcb->asoc.my_vtag ^
  	              ntohs(stcb->rport) ^
  	              ntohs(stcb->sctp_ep->sctp_lport);
  	net->flowtype = M_HASHTYPE_OPAQUE_HASH;
  #endif
  	if (netp) {
  		*netp = net;
  	}
  	netfirst = TAILQ_FIRST(&stcb->asoc.nets);
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	if (net->ro.ro_nh == NULL) {
  #else
  	if (net->ro.ro_rt == NULL) {
  #endif
  		/* 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);
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	} else if (netfirst->ro.ro_nh == NULL) {
  #else
  	} else if (netfirst->ro.ro_rt == NULL) {
  #endif
  		/*
  		 * First one has NO route. Place this one ahead of the first
  		 * one.
  		 */
  		TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	} else if (net->ro.ro_nh->nh_ifp != netfirst->ro.ro_nh->nh_ifp) {
  #else
  	} else if (net->ro.ro_rt->rt_ifp != netfirst->ro.ro_rt->rt_ifp) {
  #endif
  		/*
  		 * 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;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  			} else if (netlook->ro.ro_nh == NULL) {
  #else
  			} else if (netlook->ro.ro_rt == NULL) {
  #endif
  				/* next one has NO route */
  				TAILQ_INSERT_BEFORE(netfirst, net, sctp_next);
  				break;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  			} else if (netlook->ro.ro_nh->nh_ifp != net->ro.ro_nh->nh_ifp) {
  #else
  			} else if (netlook->ro.ro_rt->rt_ifp != net->ro.ro_rt->rt_ifp) {
  #endif
  				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;
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	} else if ((stcb->asoc.primary_destination->ro.ro_nh == NULL) &&
  	           (net->ro.ro_nh) &&
  #else
  	} else if ((stcb->asoc.primary_destination->ro.ro_rt == NULL) &&
  	           (net->ro.ro_rt) &&
  #endif
  	           ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) {
  		/* No route to current primary adopt new primary */
  		stcb->asoc.primary_destination = 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 efficient 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);
  }
  
  static uint32_t
  sctp_aloc_a_assoc_id(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
  {
  	uint32_t id;
  	struct sctpasochead *head;
  	struct sctp_tcb *lstcb;
  
   try_again:
  	if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
  		/* TSNH */
  		return (0);
  	}
  	/*
  	 * We don't allow assoc id to be one of SCTP_FUTURE_ASSOC,
  	 * SCTP_CURRENT_ASSOC and SCTP_ALL_ASSOC.
  	 */
  	if (inp->sctp_associd_counter <= SCTP_ALL_ASSOC) {
  		inp->sctp_associd_counter = SCTP_ALL_ASSOC + 1;
  	}
  	id = inp->sctp_associd_counter;
  	inp->sctp_associd_counter++;
  	lstcb = sctp_findasoc_ep_asocid_locked(inp, (sctp_assoc_t)id, 0);
  	if (lstcb) {
  		goto try_again;
  	}
  	head = &inp->sctp_asocidhash[SCTP_PCBHASH_ASOC(id, inp->hashasocidmark)];
  	LIST_INSERT_HEAD(head, stcb, sctp_tcbasocidhash);
  	stcb->asoc.in_asocid_hash = 1;
  	return (id);
  }
  
  /*
   * 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 *error, uint32_t override_tag, uint32_t vrf_id,
                  uint16_t o_streams, uint16_t port,
  #if defined(__FreeBSD__) && !defined(__Userspace__)
                  struct thread *p,
  #elif defined(_WIN32) && !defined(__Userspace__)
                  PKTHREAD p,
  #else
  #if defined(__Userspace__)
                  /*  __Userspace__ NULL proc is going to be passed here. See sctp_lower_sosend */
  #endif
                  struct proc *p,
  #endif
                  int initialize_auth_params)
  {
  	/* 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 (SCTP_BASE_INFO(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) &&
  	    ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_PORTREUSE)) ||
  	     (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED))) {
  		/*
  		 * 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);
  	}
  	if ((inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) ||
  	    (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE)) {
  		if ((inp->sctp_flags & SCTP_PCB_FLAGS_WAS_CONNECTED) ||
  		    (inp->sctp_flags & SCTP_PCB_FLAGS_WAS_ABORTED)) {
  			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);
  		switch (firstaddr->sa_family) {
  #ifdef INET
  		case AF_INET:
  			SCTPDBG(SCTP_DEBUG_PCB3, "Port:%d\n",
  			        ntohs(((struct sockaddr_in *)firstaddr)->sin_port));
  			break;
  #endif
  #ifdef INET6
  		case AF_INET6:
  			SCTPDBG(SCTP_DEBUG_PCB3, "Port:%d\n",
  			        ntohs(((struct sockaddr_in6 *)firstaddr)->sin6_port));
  			break;
  #endif
  #if defined(__Userspace__)
  		case AF_CONN:
  			SCTPDBG(SCTP_DEBUG_PCB3, "Port:%d\n",
  			        ntohs(((struct sockaddr_conn *)firstaddr)->sconn_port));
  			break;
  #endif
  		default:
  			break;
  		}
  	} else {
  		SCTPDBG(SCTP_DEBUG_PCB3,"None\n");
  	}
  #endif				/* SCTP_DEBUG */
  	switch (firstaddr->sa_family) {
  #ifdef INET
  	case AF_INET:
  	{
  		struct sockaddr_in *sin;
  
  		sin = (struct sockaddr_in *)firstaddr;
  		if ((ntohs(sin->sin_port) == 0) ||
  		    (sin->sin_addr.s_addr == INADDR_ANY) ||
  		    (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
  		    IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) ||
  #if defined(__Userspace__)
  		    (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_CONN) != 0) ||
  		     (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) != 0) &&
  		      (SCTP_IPV6_V6ONLY(inp) != 0)))) {
  #else
  		    (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) != 0) &&
  		     (SCTP_IPV6_V6ONLY(inp) != 0))) {
  #endif
  			/* 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;
  		break;
  	}
  #endif
  #ifdef INET6
  	case AF_INET6:
  	{
  		struct sockaddr_in6 *sin6;
  
  		sin6 = (struct sockaddr_in6 *)firstaddr;
  		if ((ntohs(sin6->sin6_port) == 0) ||
  		    IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
  		    IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) ||
  		    ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0)) {
  			/* 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;
  		break;
  	}
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  	{
  		struct sockaddr_conn *sconn;
  
  		sconn = (struct sockaddr_conn *)firstaddr;
  		if ((ntohs(sconn->sconn_port) == 0) ||
  		    (sconn->sconn_addr == NULL) ||
  		    ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_CONN) == 0)) {
  			/* Invalid address */
  			SCTP_INP_RUNLOCK(inp);
  			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PCB, EINVAL);
  			*error = EINVAL;
  			return (NULL);
  		}
  		rport = sconn->sconn_port;
  		break;
  	}
  #endif
  	default:
  		/* 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
  		 * ephemeral bind for you.
  		 */
  		if ((err = sctp_inpcb_bind(inp->sctp_socket, NULL, NULL, p))) {
  			/* bind error, probably perm */
  			*error = err;
  			return (NULL);
  		}
  	}
  	stcb = SCTP_ZONE_GET(SCTP_BASE_INFO(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();
  
  	memset(stcb, 0, sizeof(*stcb));
  	asoc = &stcb->asoc;
  
  	SCTP_TCB_LOCK_INIT(stcb);
  	SCTP_TCB_SEND_LOCK_INIT(stcb);
  	stcb->rport = rport;
  	/* setup back pointer's */
  	stcb->sctp_ep = inp;
  	stcb->sctp_socket = inp->sctp_socket;
  	if ((err = sctp_init_asoc(inp, stcb, override_tag, vrf_id, o_streams))) {
  		/* failed */
  		SCTP_TCB_LOCK_DESTROY(stcb);
  		SCTP_TCB_SEND_LOCK_DESTROY(stcb);
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), stcb);
  		SCTP_DECR_ASOC_COUNT();
  		*error = err;
  		return (NULL);
  	}
  	/* and the port */
  	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(SCTP_BASE_INFO(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);
  
  	asoc->assoc_id = sctp_aloc_a_assoc_id(inp, stcb);
  	/* now that my_vtag is set, add it to the hash */
  	head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
  	/* put it in the bucket in the vtag hash of assoc's for the system */
  	LIST_INSERT_HEAD(head, stcb, sctp_asocs);
  	SCTP_INP_INFO_WUNLOCK();
  
  	if (sctp_add_remote_addr(stcb, firstaddr, NULL, port, 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;
  		}
  		if (asoc->nr_mapping_array) {
  			SCTP_FREE(asoc->nr_mapping_array, SCTP_M_MAP);
  			asoc->nr_mapping_array = NULL;
  		}
  		SCTP_DECR_ASOC_COUNT();
  		SCTP_TCB_UNLOCK(stcb);
  		SCTP_TCB_LOCK_DESTROY(stcb);
  		SCTP_TCB_SEND_LOCK_DESTROY(stcb);
  		LIST_REMOVE(stcb, sctp_tcbasocidhash);
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(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->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->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);
  	}
  	if (initialize_auth_params == SCTP_INITIALIZE_AUTH_PARAMS) {
  		sctp_initialize_auth_params(inp, stcb);
  	}
  	SCTP_INP_WUNLOCK(inp);
  	SCTPDBG(SCTP_DEBUG_PCB1, "Association %p now allocated\n", (void *)stcb);
  	return (stcb);
  }
  
  void
  sctp_remove_net(struct sctp_tcb *stcb, struct sctp_nets *net)
  {
  	struct sctp_inpcb *inp;
  	struct sctp_association *asoc;
  
  	inp = stcb->sctp_ep;
  	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 out;
  			}
  			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);
  		}
  out:
  		/* 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;
  	}
  	if (net == asoc->last_net_cmt_send_started) {
  		/* Clear net */
  		asoc->last_net_cmt_send_started = NULL;
  	}
  	if (net == stcb->asoc.alternate) {
  		sctp_free_remote_addr(stcb->asoc.alternate);
  		stcb->asoc.alternate = NULL;
  	}
  	sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
  	                SCTP_FROM_SCTP_PCB + SCTP_LOC_9);
  	sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
  	                SCTP_FROM_SCTP_PCB + SCTP_LOC_10);
  	net->dest_state |= SCTP_ADDR_BEING_DELETED;
  	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, *nnet;
  
  	asoc = &stcb->asoc;
  
  	/* locate the address */
  	TAILQ_FOREACH_SAFE(net, &asoc->nets, sctp_next, nnet) {
  		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, uint16_t lport, uint16_t rport)
  {
  	struct sctpvtaghead *chain;
  	struct sctp_tagblock *twait_block;
  	int found = 0;
  	int i;
  
  	chain = &SCTP_BASE_INFO(vtag_timewait)[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
  	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].lport == lport) &&
  		      (twait_block->vtag_block[i].rport == rport)) {
  				twait_block->vtag_block[i].tv_sec_at_expire = 0;
  				twait_block->vtag_block[i].v_tag = 0;
  				twait_block->vtag_block[i].lport = 0;
  				twait_block->vtag_block[i].rport = 0;
  				found = 1;
  				break;
  			}
  		}
  		if (found)
  			break;
  	}
  }
  
  int
  sctp_is_in_timewait(uint32_t tag, uint16_t lport, uint16_t rport)
  {
  	struct sctpvtaghead *chain;
  	struct sctp_tagblock *twait_block;
  	int found = 0;
  	int i;
  
  	SCTP_INP_INFO_WLOCK();
  	chain = &SCTP_BASE_INFO(vtag_timewait)[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
  	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].lport == lport)  &&
  			    (twait_block->vtag_block[i].rport == rport)) {
  				found = 1;
  				break;
  			}
  		}
  		if (found)
  			break;
  	}
  	SCTP_INP_INFO_WUNLOCK();
  	return (found);
  }
  
  void
  sctp_add_vtag_to_timewait(uint32_t tag, uint32_t time, uint16_t lport, uint16_t rport)
  {
  	struct sctpvtaghead *chain;
  	struct sctp_tagblock *twait_block;
  	struct timeval now;
  	int set, i;
  
  	if (time == 0) {
  		/* Its disabled */
  		return;
  	}
  	(void)SCTP_GETTIME_TIMEVAL(&now);
  	chain = &SCTP_BASE_INFO(vtag_timewait)[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
  	set = 0;
  	LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
  		/* Block(s) present, lets find space, and expire on the fly */
  		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;
  				twait_block->vtag_block[i].lport = lport;
  				twait_block->vtag_block[i].rport = rport;
  				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;
  				twait_block->vtag_block[i].lport = 0;
  				twait_block->vtag_block[i].rport = 0;
  				if (set == 0) {
  					/* Reuse it for my new tag */
  					twait_block->vtag_block[i].tv_sec_at_expire = now.tv_sec + time;
  					twait_block->vtag_block[i].v_tag = tag;
  					twait_block->vtag_block[i].lport = lport;
  					twait_block->vtag_block[i].rport = rport;
  					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;
  		twait_block->vtag_block[0].lport = lport;
  		twait_block->vtag_block[0].rport = rport;
  	}
  }
  
  void
  sctp_clean_up_stream(struct sctp_tcb *stcb, struct sctp_readhead *rh)
  {
  	struct sctp_tmit_chunk *chk, *nchk;
  	struct sctp_queued_to_read *control, *ncontrol;
  
  	TAILQ_FOREACH_SAFE(control, rh, next_instrm, ncontrol) {
  		TAILQ_REMOVE(rh, control, next_instrm);
  		control->on_strm_q = 0;
  		if (control->on_read_q == 0) {
  			sctp_free_remote_addr(control->whoFrom);
  			if (control->data) {
  				sctp_m_freem(control->data);
  				control->data = NULL;
  			}
  		}
  		/* Reassembly free? */
  		TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
  			TAILQ_REMOVE(&control->reasm, chk, sctp_next);
  			if (chk->data) {
  				sctp_m_freem(chk->data);
  				chk->data = NULL;
  			}
  			if (chk->holds_key_ref)
  				sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
  			sctp_free_remote_addr(chk->whoTo);
  			SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
  			SCTP_DECR_CHK_COUNT();
  			/*sa_ignore FREED_MEMORY*/
  		}
  		/*
  		 * We don't free the address here
  		 * since all the net's were freed
  		 * above.
  		 */
  		if (control->on_read_q == 0) {
  			sctp_free_a_readq(stcb, control);
  		}
  	}
  }
  
  /*-
   * 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, *nnet;
  	struct sctp_laddr *laddr, *naddr;
  	struct sctp_tmit_chunk *chk, *nchk;
  	struct sctp_asconf_addr *aparam, *naparam;
  	struct sctp_asconf_ack *aack, *naack;
  	struct sctp_stream_reset_list *strrst, *nstrrst;
  	struct sctp_queued_to_read *sq, *nsq;
  	struct sctp_stream_queue_pending *sp, *nsp;
  	sctp_sharedkey_t *shared_key, *nshared_key;
  	struct socket *so;
  
  	/* first, lets purge the entry from the hash table. */
  #if defined(__APPLE__) && !defined(__Userspace__)
  	sctp_lock_assert(SCTP_INP_SO(inp));
  #endif
  
  #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);
  	}
  	SCTP_TCB_SEND_LOCK(stcb);
  	if (stcb->asoc.alternate) {
  		sctp_free_remote_addr(stcb->asoc.alternate);
  		stcb->asoc.alternate = NULL;
  	}
  #if !(defined(__APPLE__) && !defined(__Userspace__))
  	/* TEMP CODE */
  	if (stcb->freed_from_where == 0) {
  		/* Only record the first place free happened from */
  		stcb->freed_from_where = from_location;
  	}
  	/* TEMP CODE */
  #endif
  
  	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_SEND_UNLOCK(stcb);
  			SCTP_TCB_UNLOCK(stcb);
  #ifdef SCTP_LOG_CLOSING
  			sctp_log_closing(inp, stcb, 8);
  #endif
  			return (0);
  		}
  	}
  	/* Now clean up any other timers */
  	sctp_stop_association_timers(stcb, false);
  	/* Now the read queue needs to be cleaned up (only once) */
  	if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0) {
  		SCTP_ADD_SUBSTATE(stcb, 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_stcb_is_feature_on(inp, stcb, 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->mid & 0x0000ffff);
  						sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
  						                stcb,
  						                SCTP_PARTIAL_DELIVERY_ABORTED,
  						                (void *)&strseq,
  						                SCTP_SO_LOCKED);
  						stcb->asoc.control_pdapi = NULL;
  					}
  				}
  				/* Add an end to wake them */
  				sq->end_added = 1;
  			}
  		}
  		SCTP_INP_READ_UNLOCK(inp);
  		if (stcb->block_entry) {
  			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) || (stcb->asoc.state & SCTP_STATE_IN_ACCEPT_QUEUE)) {
  		/* Someone holds a reference OR the socket is unaccepted yet.
  		*/
  		if ((stcb->asoc.refcnt)  ||
  		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
  		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE)) {
  			SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
  			sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, stcb, NULL);
  		}
  		SCTP_TCB_SEND_UNLOCK(stcb);
  		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_SEND_UNLOCK(stcb);
  		SCTP_TCB_UNLOCK(stcb);
  		SCTP_INP_INFO_WLOCK();
  		SCTP_INP_WLOCK(inp);
  		SCTP_TCB_LOCK(stcb);
  		SCTP_TCB_SEND_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) {
  				SOCKBUF_LOCK(&so->so_rcv);
  				so->so_state &= ~(SS_ISCONNECTING |
  				    SS_ISDISCONNECTING |
  				    SS_ISCONFIRMING |
  				    SS_ISCONNECTED);
  				so->so_state |= SS_ISDISCONNECTED;
  #if defined(__APPLE__) && !defined(__Userspace__)
  				socantrcvmore(so);
  #else
  				socantrcvmore_locked(so);
  #endif
  				socantsendmore(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.
  	 */
  	/* re-increment the lock */
  	if (from_inpcbfree == SCTP_NORMAL_PROC) {
  		atomic_add_int(&stcb->asoc.refcnt, -1);
  	}
  	if (stcb->asoc.refcnt) {
  		SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
  		sctp_timer_start(SCTP_TIMER_TYPE_ASOCKILL, inp, stcb, NULL);
  		if (from_inpcbfree == SCTP_NORMAL_PROC) {
  			SCTP_INP_INFO_WUNLOCK();
  			SCTP_INP_WUNLOCK(inp);
  		}
  		SCTP_TCB_SEND_UNLOCK(stcb);
  		SCTP_TCB_UNLOCK(stcb);
  		return (0);
  	}
  	asoc->state = 0;
  	if (inp->sctp_tcbhash) {
  		LIST_REMOVE(stcb, sctp_tcbhash);
  	}
  	if (stcb->asoc.in_asocid_hash) {
  		LIST_REMOVE(stcb, sctp_tcbasocidhash);
  	}
  	/* 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);
  	}
  	/* pull from vtag hash */
  	LIST_REMOVE(stcb, sctp_asocs);
  	sctp_add_vtag_to_timewait(asoc->my_vtag, SCTP_BASE_SYSCTL(sctp_vtag_time_wait),
  				  inp->sctp_lport, stcb->rport);
  
  	/* Now restop the timers to be sure
  	 * this is paranoia at is finest!
  	 */
  	sctp_stop_association_timers(stcb, true);
  
  	/*
  	 * 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 */
  		TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
  			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
  			TAILQ_REMOVE(&outs->outqueue, sp, next);
  			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
  			sctp_free_spbufspace(stcb, asoc, sp);
  			if (sp->data) {
  				if (so) {
  					/* Still an open socket - report */
  					sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, stcb,
  					                0, (void *)sp, SCTP_SO_LOCKED);
  				}
  				if (sp->data) {
  					sctp_m_freem(sp->data);
  					sp->data = NULL;
  					sp->tail_mbuf = NULL;
  					sp->length = 0;
  				}
  			}
  			if (sp->net) {
  				sctp_free_remote_addr(sp->net);
  				sp->net = NULL;
  			}
  			sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
  		}
  	}
  	/*sa_ignore FREED_MEMORY*/
  	TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
  		TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
  		SCTP_FREE(strrst, SCTP_M_STRESET);
  	}
  	TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
  		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_free_a_readq(stcb, sq);
  		/*sa_ignore FREED_MEMORY*/
  	}
  	TAILQ_FOREACH_SAFE(chk, &asoc->free_chunks, sctp_next, nchk) {
  		TAILQ_REMOVE(&asoc->free_chunks, chk, sctp_next);
  		if (chk->data) {
  			sctp_m_freem(chk->data);
  			chk->data = NULL;
  		}
  		if (chk->holds_key_ref)
  			sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
  		SCTP_DECR_CHK_COUNT();
  		atomic_subtract_int(&SCTP_BASE_INFO(ipi_free_chunks), 1);
  		asoc->free_chunk_cnt--;
  		/*sa_ignore FREED_MEMORY*/
  	}
  	/* pending send queue SHOULD be empty */
  	TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
  		if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
  			asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
  #ifdef INVARIANTS
  		} else {
  			panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
  #endif
  		}
  		TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
  		if (chk->data) {
  			if (so) {
  				/* Still a socket? */
  				sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
  				                0, chk, SCTP_SO_LOCKED);
  			}
  			if (chk->data) {
  				sctp_m_freem(chk->data);
  				chk->data = NULL;
  			}
  		}
  		if (chk->holds_key_ref)
  			sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
  		if (chk->whoTo) {
  			sctp_free_remote_addr(chk->whoTo);
  			chk->whoTo = NULL;
  		}
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
  		SCTP_DECR_CHK_COUNT();
  		/*sa_ignore FREED_MEMORY*/
  	}
  	/* sent queue SHOULD be empty */
  	TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  		if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
  			if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
  				asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
  #ifdef INVARIANTS
  			} else {
  				panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
  #endif
  			}
  		}
  		TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  		if (chk->data) {
  			if (so) {
  				/* Still a socket? */
  				sctp_ulp_notify(SCTP_NOTIFY_SENT_DG_FAIL, stcb,
  				                0, chk, SCTP_SO_LOCKED);
  			}
  			if (chk->data) {
  				sctp_m_freem(chk->data);
  				chk->data = NULL;
  			}
  		}
  		if (chk->holds_key_ref)
  			sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
  		sctp_free_remote_addr(chk->whoTo);
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
  		SCTP_DECR_CHK_COUNT();
  		/*sa_ignore FREED_MEMORY*/
  	}
  #ifdef INVARIANTS
  	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
  		if (stcb->asoc.strmout[i].chunks_on_queues > 0) {
  			panic("%u chunks left for stream %u.", stcb->asoc.strmout[i].chunks_on_queues, i);
  		}
  	}
  #endif
  	/* control queue MAY not be empty */
  	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
  		TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
  		if (chk->data) {
  			sctp_m_freem(chk->data);
  			chk->data = NULL;
  		}
  		if (chk->holds_key_ref)
  			sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
  		sctp_free_remote_addr(chk->whoTo);
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
  		SCTP_DECR_CHK_COUNT();
  		/*sa_ignore FREED_MEMORY*/
  	}
  	/* ASCONF queue MAY not be empty */
  	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
  		TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
  		if (chk->data) {
  			sctp_m_freem(chk->data);
  			chk->data = NULL;
  		}
  		if (chk->holds_key_ref)
  			sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
  		sctp_free_remote_addr(chk->whoTo);
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
  		SCTP_DECR_CHK_COUNT();
  		/*sa_ignore FREED_MEMORY*/
  	}
  	if (asoc->mapping_array) {
  		SCTP_FREE(asoc->mapping_array, SCTP_M_MAP);
  		asoc->mapping_array = NULL;
  	}
  	if (asoc->nr_mapping_array) {
  		SCTP_FREE(asoc->nr_mapping_array, SCTP_M_MAP);
  		asoc->nr_mapping_array = NULL;
  	}
  	/* the stream outs */
  	if (asoc->strmout) {
  		SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
  		asoc->strmout = NULL;
  	}
  	asoc->strm_realoutsize = asoc->streamoutcnt = 0;
  	if (asoc->strmin) {
  		for (i = 0; i < asoc->streamincnt; i++) {
  			sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
  			sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
  		}
  		SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
  		asoc->strmin = NULL;
  	}
  	asoc->streamincnt = 0;
  	TAILQ_FOREACH_SAFE(net, &asoc->nets, sctp_next, nnet) {
  #ifdef INVARIANTS
  		if (SCTP_BASE_INFO(ipi_count_raddr) == 0) {
  			panic("no net's left alloc'ed, or list points to itself");
  		}
  #endif
  		TAILQ_REMOVE(&asoc->nets, net, sctp_next);
  		sctp_free_remote_addr(net);
  	}
  	LIST_FOREACH_SAFE(laddr, &asoc->sctp_restricted_addrs, sctp_nxt_addr, naddr) {
  		/*sa_ignore FREED_MEMORY*/
  		sctp_remove_laddr(laddr);
  	}
  
  	/* pending asconf (address) parameters */
  	TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
  		/*sa_ignore FREED_MEMORY*/
  		TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
  		SCTP_FREE(aparam,SCTP_M_ASC_ADDR);
  	}
  	TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
  		/*sa_ignore FREED_MEMORY*/
  		TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
  		if (aack->data != NULL) {
  			sctp_m_freem(aack->data);
  		}
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(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);
  
  	LIST_FOREACH_SAFE(shared_key, &asoc->shared_keys, next, nshared_key) {
  		LIST_REMOVE(shared_key, next);
  		sctp_free_sharedkey(shared_key);
  		/*sa_ignore FREED_MEMORY*/
  	}
  
  	/* Insert new items here :> */
  
  	/* Get rid of LOCK */
  	SCTP_TCB_SEND_UNLOCK(stcb);
  	SCTP_TCB_UNLOCK(stcb);
  	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);
  	}
  #if defined(__APPLE__) && !defined(__Userspace__)
  	/* TEMP CODE */
  	stcb->freed_from_where = from_location;
  #endif
  #ifdef SCTP_TRACK_FREED_ASOCS
  	if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
  		/* now clean up the tasoc itself */
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asoc), stcb);
  		SCTP_DECR_ASOC_COUNT();
  	} else {
  		LIST_INSERT_HEAD(&inp->sctp_asoc_free_list, stcb, sctp_tcblist);
  	}
  #else
  	SCTP_ZONE_FREE(SCTP_BASE_INFO(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 last one) 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);
  		} else {
  			/* The socket is still open. */
  			SCTP_INP_DECR_REF(inp);
  			SCTP_INP_RUNLOCK(inp);
  		}
  	}
  	/* 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 */
  	switch (destaddr->sa_family) {
  #ifdef INET6
  	case AF_INET6:
  		answer = inp->ip_inp.inp.inp_vflag & INP_IPV6;
  		break;
  #endif
  #ifdef INET
  	case AF_INET:
  		answer = inp->ip_inp.inp.inp_vflag & INP_IPV4;
  		break;
  #endif
  #if defined(__Userspace__)
  	case AF_CONN:
  		answer = inp->ip_inp.inp.inp_vflag & INP_CONN;
  		break;
  #endif
  	default:
  		/* invalid family, so it's unreachable */
  		answer = 0;
  		break;
  	}
  	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",
  				__func__);
  			continue;
  		}
  
  		if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
  			continue;
  		}
  		switch (laddr->ifa->address.sa.sa_family) {
  #ifdef INET6
  		case AF_INET6:
  			inp->ip_inp.inp.inp_vflag |= INP_IPV6;
  			break;
  #endif
  #ifdef INET
  		case AF_INET:
  			inp->ip_inp.inp.inp_vflag |= INP_IPV4;
  			break;
  #endif
  #if defined(__Userspace__)
  		case AF_CONN:
  			inp->ip_inp.inp.inp_vflag |= INP_CONN;
  			break;
  #endif
  		default:
  			break;
  		}
  	}
  }
  
  /*
   * 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;
  	struct sctp_tcb *stcb;
  	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;
  	}
  #ifdef INET6
  	if (ifa->address.sa.sa_family == AF_INET6) {
  		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
  			/* Can't bind a non-useable addr. */
  			return;
  		}
  	}
  #endif
  	/* 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 */
  		switch (ifa->address.sa.sa_family) {
  #ifdef INET6
  		case AF_INET6:
  			inp->ip_inp.inp.inp_vflag |= INP_IPV6;
  			break;
  #endif
  #ifdef INET
  		case AF_INET:
  			inp->ip_inp.inp.inp_vflag |= INP_IPV4;
  			break;
  #endif
  #if defined(__Userspace__)
  		case AF_CONN:
  			inp->ip_inp.inp.inp_vflag |= INP_CONN;
  			break;
  #endif
  		default:
  			break;
  		}
  		LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
  			sctp_add_local_addr_restricted(stcb, ifa);
  		}
  	}
  	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 == laddr->ifa) {
  					/* Yep, purge src address selected */
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  					RO_NHFREE(&net->ro);
  #else
  					sctp_rtentry_t *rt;
  
  					/* delete this address if cached */
  					rt = net->ro.ro_rt;
  					if (rt != NULL) {
  						RTFREE(rt);
  						net->ro.ro_rt = NULL;
  					}
  #endif
  					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_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;
  
  #ifdef INET6
  	if (ifa->address.sa.sa_family == AF_INET6) {
  		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
  			/* Can't bind a non-existent addr. */
  			return;
  		}
  	}
  #endif
  	/* 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;
  }
  
  /*
   * 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;
  }
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  /* sysctl */
  static int sctp_max_number_of_assoc = SCTP_MAX_NUM_OF_ASOC;
  static int sctp_scale_up_for_address = SCTP_SCALE_FOR_ADDR;
  #endif
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #if defined(SCTP_MCORE_INPUT) && defined(SMP)
  struct sctp_mcore_ctrl *sctp_mcore_workers = NULL;
  int *sctp_cpuarry = NULL;
  
  void
  sctp_queue_to_mcore(struct mbuf *m, int off, int cpu_to_use)
  {
  	/* Queue a packet to a processor for the specified core */
  	struct sctp_mcore_queue *qent;
  	struct sctp_mcore_ctrl *wkq;
  	int need_wake = 0;
  
  	if (sctp_mcore_workers == NULL) {
  		/* Something went way bad during setup */
  		sctp_input_with_port(m, off, 0);
  		return;
  	}
  	SCTP_MALLOC(qent, struct sctp_mcore_queue *,
  		    (sizeof(struct sctp_mcore_queue)),
  		    SCTP_M_MCORE);
  	if (qent == NULL) {
  		/* This is trouble  */
  		sctp_input_with_port(m, off, 0);
  		return;
  	}
  	qent->vn = curvnet;
  	qent->m = m;
  	qent->off = off;
  	qent->v6 = 0;
  	wkq = &sctp_mcore_workers[cpu_to_use];
  	SCTP_MCORE_QLOCK(wkq);
  
  	TAILQ_INSERT_TAIL(&wkq->que, qent, next);
  	if (wkq->running == 0) {
  		need_wake = 1;
  	}
  	SCTP_MCORE_QUNLOCK(wkq);
  	if (need_wake) {
  		wakeup(&wkq->running);
  	}
  }
  
  static void
  sctp_mcore_thread(void *arg)
  {
  
  	struct sctp_mcore_ctrl *wkq;
  	struct sctp_mcore_queue *qent;
  
  	wkq = (struct sctp_mcore_ctrl *)arg;
  	struct mbuf *m;
  	int off, v6;
  
  	/* Wait for first tickle */
  	SCTP_MCORE_LOCK(wkq);
  	wkq->running = 0;
  	msleep(&wkq->running,
  	       &wkq->core_mtx,
  	       0, "wait for pkt", 0);
  	SCTP_MCORE_UNLOCK(wkq);
  
  	/* Bind to our cpu */
  	thread_lock(curthread);
  	sched_bind(curthread, wkq->cpuid);
  	thread_unlock(curthread);
  
  	/* Now lets start working */
  	SCTP_MCORE_LOCK(wkq);
  	/* Now grab lock and go */
  	for (;;) {
  		SCTP_MCORE_QLOCK(wkq);
  	skip_sleep:
  		wkq->running = 1;
  		qent = TAILQ_FIRST(&wkq->que);
  		if (qent) {
  			TAILQ_REMOVE(&wkq->que, qent, next);
  			SCTP_MCORE_QUNLOCK(wkq);
  			CURVNET_SET(qent->vn);
  			m = qent->m;
  			off = qent->off;
  			v6 = qent->v6;
  			SCTP_FREE(qent, SCTP_M_MCORE);
  			if (v6 == 0) {
  				sctp_input_with_port(m, off, 0);
  			} else {
  				SCTP_PRINTF("V6 not yet supported\n");
  				sctp_m_freem(m);
  			}
  			CURVNET_RESTORE();
  			SCTP_MCORE_QLOCK(wkq);
  		}
  		wkq->running = 0;
  		if (!TAILQ_EMPTY(&wkq->que)) {
  			goto skip_sleep;
  		}
  		SCTP_MCORE_QUNLOCK(wkq);
  		msleep(&wkq->running,
  		       &wkq->core_mtx,
  		       0, "wait for pkt", 0);
  	}
  }
  
  static void
  sctp_startup_mcore_threads(void)
  {
  	int i, cpu;
  
  	if (mp_ncpus == 1)
  		return;
  
  	if (sctp_mcore_workers != NULL) {
  		/* Already been here in some previous
  		 * vnet?
  		 */
  		return;
  	}
  	SCTP_MALLOC(sctp_mcore_workers, struct sctp_mcore_ctrl *,
  		    ((mp_maxid+1) * sizeof(struct sctp_mcore_ctrl)),
  		    SCTP_M_MCORE);
  	if (sctp_mcore_workers == NULL) {
  		/* TSNH I hope */
  		return;
  	}
  	memset(sctp_mcore_workers, 0 , ((mp_maxid+1) *
  					sizeof(struct sctp_mcore_ctrl)));
  	/* Init the structures */
  	for (i = 0; i<=mp_maxid; i++) {
  		TAILQ_INIT(&sctp_mcore_workers[i].que);
  		SCTP_MCORE_LOCK_INIT(&sctp_mcore_workers[i]);
  		SCTP_MCORE_QLOCK_INIT(&sctp_mcore_workers[i]);
  		sctp_mcore_workers[i].cpuid = i;
  	}
  	if (sctp_cpuarry == NULL) {
  		SCTP_MALLOC(sctp_cpuarry, int *,
  			    (mp_ncpus * sizeof(int)),
  			    SCTP_M_MCORE);
  		i = 0;
  		CPU_FOREACH(cpu) {
  			sctp_cpuarry[i] = cpu;
  			i++;
  		}
  	}
  	/* Now start them all */
  	CPU_FOREACH(cpu) {
  		(void)kproc_create(sctp_mcore_thread,
  				   (void *)&sctp_mcore_workers[cpu],
  				   &sctp_mcore_workers[cpu].thread_proc,
  				   0,
  				   SCTP_KTHREAD_PAGES,
  				   SCTP_MCORE_NAME);
  	}
  }
  #endif
  #endif
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #if defined(SCTP_NOT_YET)
  static struct mbuf *
  sctp_netisr_hdlr(struct mbuf *m, uintptr_t source)
  {
  	struct ip *ip;
  	struct sctphdr *sh;
  	int offset;
  	uint32_t flowid, tag;
  
  	/*
  	 * No flow id built by lower layers fix it so we
  	 * create one.
  	 */
  	ip = mtod(m, struct ip *);
  	offset = (ip->ip_hl << 2) + sizeof(struct sctphdr);
  	if (SCTP_BUF_LEN(m) < offset) {
  		if ((m = m_pullup(m, offset)) == NULL) {
  			SCTP_STAT_INCR(sctps_hdrops);
  			return (NULL);
  		}
  		ip = mtod(m, struct ip *);
  	}
  	sh = (struct sctphdr *)((caddr_t)ip + (ip->ip_hl << 2));
  	tag = htonl(sh->v_tag);
  	flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
  	m->m_pkthdr.flowid = flowid;
  	/* FIX ME */
  	m->m_flags |= M_FLOWID;
  	return (m);
  }
  
  #endif
  #endif
  void
  #if defined(__Userspace__)
  sctp_pcb_init(int start_threads)
  #else
  sctp_pcb_init(void)
  #endif
  {
  	/*
  	 * SCTP initialization for the PCB structures should be called by
  	 * the sctp_init() function.
  	 */
  	int i;
  	struct timeval tv;
  
  	if (SCTP_BASE_VAR(sctp_pcb_initialized) != 0) {
  		/* error I was called twice */
  		return;
  	}
  	SCTP_BASE_VAR(sctp_pcb_initialized) = 1;
  
  #if defined(SCTP_PROCESS_LEVEL_LOCKS)
  #if !defined(_WIN32)
  	pthread_mutexattr_init(&SCTP_BASE_VAR(mtx_attr));
  #ifdef INVARIANTS
  	pthread_mutexattr_settype(&SCTP_BASE_VAR(mtx_attr), PTHREAD_MUTEX_ERRORCHECK);
  #endif
  #endif
  #endif
  #if defined(SCTP_LOCAL_TRACE_BUF)
  #if defined(_WIN32) && !defined(__Userspace__)
  	if (SCTP_BASE_SYSCTL(sctp_log) != NULL) {
  		memset(SCTP_BASE_SYSCTL(sctp_log), 0, sizeof(struct sctp_log));
  	}
  #else
  	memset(&SCTP_BASE_SYSCTL(sctp_log), 0, sizeof(struct sctp_log));
  #endif
  #endif
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #if defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
  	SCTP_MALLOC(SCTP_BASE_STATS, struct sctpstat *,
  		    ((mp_maxid+1) * sizeof(struct sctpstat)),
  		    SCTP_M_MCORE);
  #endif
  #endif
  	(void)SCTP_GETTIME_TIMEVAL(&tv);
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #if defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
  	memset(SCTP_BASE_STATS, 0, sizeof(struct sctpstat) * (mp_maxid+1));
  	SCTP_BASE_STATS[PCPU_GET(cpuid)].sctps_discontinuitytime.tv_sec = (uint32_t)tv.tv_sec;
  	SCTP_BASE_STATS[PCPU_GET(cpuid)].sctps_discontinuitytime.tv_usec = (uint32_t)tv.tv_usec;
  #else
  	memset(&SCTP_BASE_STATS, 0, sizeof(struct sctpstat));
  	SCTP_BASE_STAT(sctps_discontinuitytime).tv_sec = (uint32_t)tv.tv_sec;
  	SCTP_BASE_STAT(sctps_discontinuitytime).tv_usec = (uint32_t)tv.tv_usec;
  #endif
  #else
  	memset(&SCTP_BASE_STATS, 0, sizeof(struct sctpstat));
  	SCTP_BASE_STAT(sctps_discontinuitytime).tv_sec = (uint32_t)tv.tv_sec;
  	SCTP_BASE_STAT(sctps_discontinuitytime).tv_usec = (uint32_t)tv.tv_usec;
  #endif
  	/* init the empty list of (All) Endpoints */
  	LIST_INIT(&SCTP_BASE_INFO(listhead));
  #if defined(__APPLE__) && !defined(__Userspace__)
  	LIST_INIT(&SCTP_BASE_INFO(inplisthead));
  #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD) || defined(APPLE_LION) || defined(APPLE_MOUNTAINLION)
  	SCTP_BASE_INFO(sctbinfo).listhead = &SCTP_BASE_INFO(inplisthead);
  	SCTP_BASE_INFO(sctbinfo).mtx_grp_attr = lck_grp_attr_alloc_init();
  	lck_grp_attr_setdefault(SCTP_BASE_INFO(sctbinfo).mtx_grp_attr);
  	SCTP_BASE_INFO(sctbinfo).mtx_grp = lck_grp_alloc_init("sctppcb", SCTP_BASE_INFO(sctbinfo).mtx_grp_attr);
  	SCTP_BASE_INFO(sctbinfo).mtx_attr = lck_attr_alloc_init();
  	lck_attr_setdefault(SCTP_BASE_INFO(sctbinfo).mtx_attr);
  #else
  	SCTP_BASE_INFO(sctbinfo).ipi_listhead = &SCTP_BASE_INFO(inplisthead);
  	SCTP_BASE_INFO(sctbinfo).ipi_lock_grp_attr = lck_grp_attr_alloc_init();
  	lck_grp_attr_setdefault(SCTP_BASE_INFO(sctbinfo).ipi_lock_grp_attr);
  	SCTP_BASE_INFO(sctbinfo).ipi_lock_grp = lck_grp_alloc_init("sctppcb", SCTP_BASE_INFO(sctbinfo).ipi_lock_grp_attr);
  	SCTP_BASE_INFO(sctbinfo).ipi_lock_attr = lck_attr_alloc_init();
  	lck_attr_setdefault(SCTP_BASE_INFO(sctbinfo).ipi_lock_attr);
  #endif
  #if !defined(APPLE_LEOPARD) && !defined(APPLE_SNOWLEOPARD) && !defined(APPLE_LION) && !defined(APPLE_MOUNTAINLION)
  	SCTP_BASE_INFO(sctbinfo).ipi_gc = sctp_gc;
  	in_pcbinfo_attach(&SCTP_BASE_INFO(sctbinfo));
  #endif
  #endif
  
  	/* init the hash table of endpoints */
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	TUNABLE_INT_FETCH("net.inet.sctp.tcbhashsize", &SCTP_BASE_SYSCTL(sctp_hashtblsize));
  	TUNABLE_INT_FETCH("net.inet.sctp.pcbhashsize", &SCTP_BASE_SYSCTL(sctp_pcbtblsize));
  	TUNABLE_INT_FETCH("net.inet.sctp.chunkscale", &SCTP_BASE_SYSCTL(sctp_chunkscale));
  #endif
  	SCTP_BASE_INFO(sctp_asochash) = SCTP_HASH_INIT((SCTP_BASE_SYSCTL(sctp_hashtblsize) * 31),
  						       &SCTP_BASE_INFO(hashasocmark));
  	SCTP_BASE_INFO(sctp_ephash) = SCTP_HASH_INIT(SCTP_BASE_SYSCTL(sctp_hashtblsize),
  						     &SCTP_BASE_INFO(hashmark));
  	SCTP_BASE_INFO(sctp_tcpephash) = SCTP_HASH_INIT(SCTP_BASE_SYSCTL(sctp_hashtblsize),
  							&SCTP_BASE_INFO(hashtcpmark));
  	SCTP_BASE_INFO(hashtblsize) = SCTP_BASE_SYSCTL(sctp_hashtblsize);
  	SCTP_BASE_INFO(sctp_vrfhash) = SCTP_HASH_INIT(SCTP_SIZE_OF_VRF_HASH,
  						      &SCTP_BASE_INFO(hashvrfmark));
  
  	SCTP_BASE_INFO(vrf_ifn_hash) = SCTP_HASH_INIT(SCTP_VRF_IFN_HASH_SIZE,
  						      &SCTP_BASE_INFO(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(SCTP_BASE_INFO(ipi_zone_ep), "sctp_ep",
  		       sizeof(struct sctp_inpcb), maxsockets);
  
  	SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_asoc), "sctp_asoc",
  		       sizeof(struct sctp_tcb), sctp_max_number_of_assoc);
  
  	SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_laddr), "sctp_laddr",
  		       sizeof(struct sctp_laddr),
  		       (sctp_max_number_of_assoc * sctp_scale_up_for_address));
  
  	SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_net), "sctp_raddr",
  		       sizeof(struct sctp_nets),
  		       (sctp_max_number_of_assoc * sctp_scale_up_for_address));
  
  	SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_chunk), "sctp_chunk",
  		       sizeof(struct sctp_tmit_chunk),
  		       (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
  
  	SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_readq), "sctp_readq",
  		       sizeof(struct sctp_queued_to_read),
  		       (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
  
  	SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_strmoq), "sctp_stream_msg_out",
  		       sizeof(struct sctp_stream_queue_pending),
  		       (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
  
  	SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_asconf), "sctp_asconf",
  		       sizeof(struct sctp_asconf),
  		       (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
  
  	SCTP_ZONE_INIT(SCTP_BASE_INFO(ipi_zone_asconf_ack), "sctp_asconf_ack",
  		       sizeof(struct sctp_asconf_ack),
  		       (sctp_max_number_of_assoc * SCTP_BASE_SYSCTL(sctp_chunkscale)));
  
  	/* Master Lock INIT for info structure */
  	SCTP_INP_INFO_LOCK_INIT();
  	SCTP_STATLOG_INIT_LOCK();
  
  	SCTP_IPI_COUNT_INIT();
  	SCTP_IPI_ADDR_INIT();
  #ifdef SCTP_PACKET_LOGGING
  	SCTP_IP_PKTLOG_INIT();
  #endif
  	LIST_INIT(&SCTP_BASE_INFO(addr_wq));
  
  	SCTP_WQ_ADDR_INIT();
  	/* not sure if we need all the counts */
  	SCTP_BASE_INFO(ipi_count_ep) = 0;
  	/* assoc/tcb zone info */
  	SCTP_BASE_INFO(ipi_count_asoc) = 0;
  	/* local addrlist zone info */
  	SCTP_BASE_INFO(ipi_count_laddr) = 0;
  	/* remote addrlist zone info */
  	SCTP_BASE_INFO(ipi_count_raddr) = 0;
  	/* chunk info */
  	SCTP_BASE_INFO(ipi_count_chunk) = 0;
  
  	/* socket queue zone info */
  	SCTP_BASE_INFO(ipi_count_readq) = 0;
  
  	/* stream out queue cont */
  	SCTP_BASE_INFO(ipi_count_strmoq) = 0;
  
  	SCTP_BASE_INFO(ipi_free_strmoq) = 0;
  	SCTP_BASE_INFO(ipi_free_chunks) = 0;
  
  	SCTP_OS_TIMER_INIT(&SCTP_BASE_INFO(addr_wq_timer.timer));
  
  	/* Init the TIMEWAIT list */
  	for (i = 0; i < SCTP_STACK_VTAG_HASH_SIZE; i++) {
  		LIST_INIT(&SCTP_BASE_INFO(vtag_timewait)[i]);
  	}
  #if defined(SCTP_PROCESS_LEVEL_LOCKS)
  #if defined(_WIN32)
  	InitializeConditionVariable(&sctp_it_ctl.iterator_wakeup);
  #else
  	(void)pthread_cond_init(&sctp_it_ctl.iterator_wakeup, NULL);
  #endif
  #endif
  	sctp_startup_iterator();
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #if defined(SCTP_MCORE_INPUT) && defined(SMP)
  	sctp_startup_mcore_threads();
  #endif
  #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);
  #if defined(__FreeBSD__) && !defined(__Userspace__) && defined(SCTP_NOT_YET)
  	if (ip_register_flow_handler(sctp_netisr_hdlr, IPPROTO_SCTP)) {
  		SCTP_PRINTF("***SCTP- Error can't register netisr handler***\n");
  	}
  #endif
  #if defined(_SCTP_NEEDS_CALLOUT_) || defined(_USER_SCTP_NEEDS_CALLOUT_)
  	/* allocate the lock for the callout/timer queue */
  	SCTP_TIMERQ_LOCK_INIT();
  	TAILQ_INIT(&SCTP_BASE_INFO(callqueue));
  #endif
  #if defined(__Userspace__)
  	mbuf_initialize(NULL);
  	atomic_init();
  #if defined(INET) || defined(INET6)
  	if (start_threads)
  		recv_thread_init();
  #endif
  #endif
  }
  
  /*
   * Assumes that the SCTP_BASE_INFO() lock is NOT held.
   */
  void
  sctp_pcb_finish(void)
  {
  	struct sctp_vrflist *vrf_bucket;
  	struct sctp_vrf *vrf, *nvrf;
  	struct sctp_ifn *ifn, *nifn;
  	struct sctp_ifa *ifa, *nifa;
  	struct sctpvtaghead *chain;
  	struct sctp_tagblock *twait_block, *prev_twait_block;
  	struct sctp_laddr *wi, *nwi;
  	int i;
  	struct sctp_iterator *it, *nit;
  
  	if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
  		SCTP_PRINTF("%s: race condition on teardown.\n", __func__);
  		return;
  	}
  	SCTP_BASE_VAR(sctp_pcb_initialized) = 0;
  #if !(defined(__FreeBSD__) && !defined(__Userspace__))
  	/* Notify the iterator to exit. */
  	SCTP_IPI_ITERATOR_WQ_LOCK();
  	sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_MUST_EXIT;
  	sctp_wakeup_iterator();
  	SCTP_IPI_ITERATOR_WQ_UNLOCK();
  #endif
  #if defined(__APPLE__) && !defined(__Userspace__)
  #if !defined(APPLE_LEOPARD) && !defined(APPLE_SNOWLEOPARD) && !defined(APPLE_LION) && !defined(APPLE_MOUNTAINLION)
  	in_pcbinfo_detach(&SCTP_BASE_INFO(sctbinfo));
  #endif
  	SCTP_IPI_ITERATOR_WQ_LOCK();
  	do {
  		msleep(&sctp_it_ctl.iterator_flags,
  		       sctp_it_ctl.ipi_iterator_wq_mtx,
  		       0, "waiting_for_work", 0);
  	} while ((sctp_it_ctl.iterator_flags & SCTP_ITERATOR_EXITED) == 0);
  	thread_deallocate(sctp_it_ctl.thread_proc);
  	SCTP_IPI_ITERATOR_WQ_UNLOCK();
  #endif
  #if defined(_WIN32) && !defined(__Userspace__)
  	if (sctp_it_ctl.iterator_thread_obj != NULL) {
  		NTSTATUS status = STATUS_SUCCESS;
  
  		KeSetEvent(&sctp_it_ctl.iterator_wakeup[1], IO_NO_INCREMENT, FALSE);
  		status = KeWaitForSingleObject(sctp_it_ctl.iterator_thread_obj,
  					       Executive,
  					       KernelMode,
  					       FALSE,
  					       NULL);
  		ObDereferenceObject(sctp_it_ctl.iterator_thread_obj);
  	}
  #endif
  #if defined(__Userspace__)
  	if (SCTP_BASE_VAR(iterator_thread_started)) {
  #if defined(_WIN32)
  		WaitForSingleObject(sctp_it_ctl.thread_proc, INFINITE);
  		CloseHandle(sctp_it_ctl.thread_proc);
  		sctp_it_ctl.thread_proc = NULL;
  #else
  		pthread_join(sctp_it_ctl.thread_proc, NULL);
  		sctp_it_ctl.thread_proc = 0;
  #endif
  	}
  #endif
  #if defined(SCTP_PROCESS_LEVEL_LOCKS)
  #if defined(_WIN32)
  	DeleteConditionVariable(&sctp_it_ctl.iterator_wakeup);
  #else
  	pthread_cond_destroy(&sctp_it_ctl.iterator_wakeup);
  	pthread_mutexattr_destroy(&SCTP_BASE_VAR(mtx_attr));
  #endif
  #endif
  	/* In FreeBSD the iterator thread never exits
  	 * but we do clean up.
  	 * The only way FreeBSD reaches here is if we have VRF's
  	 * but we still add the ifdef to make it compile on old versions.
  	 */
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  retry:
  #endif
  	SCTP_IPI_ITERATOR_WQ_LOCK();
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	/*
  	 * sctp_iterator_worker() might be working on an it entry without
  	 * holding the lock.  We won't find it on the list either and
  	 * continue and free/destroy it.  While holding the lock, spin, to
  	 * avoid the race condition as sctp_iterator_worker() will have to
  	 * wait to re-acquire the lock.
  	 */
  	if (sctp_it_ctl.iterator_running != 0 || sctp_it_ctl.cur_it != NULL) {
  		SCTP_IPI_ITERATOR_WQ_UNLOCK();
  		SCTP_PRINTF("%s: Iterator running while we held the lock. Retry. "
  		            "cur_it=%p\n", __func__, sctp_it_ctl.cur_it);
  		DELAY(10);
  		goto retry;
  	}
  #endif
  	TAILQ_FOREACH_SAFE(it, &sctp_it_ctl.iteratorhead, sctp_nxt_itr, nit) {
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  		if (it->vn != curvnet) {
  			continue;
  		}
  #endif
  		TAILQ_REMOVE(&sctp_it_ctl.iteratorhead, it, sctp_nxt_itr);
  		if (it->function_atend != NULL) {
  			(*it->function_atend) (it->pointer, it->val);
  		}
  		SCTP_FREE(it,SCTP_M_ITER);
  	}
  	SCTP_IPI_ITERATOR_WQ_UNLOCK();
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	SCTP_ITERATOR_LOCK();
  	if ((sctp_it_ctl.cur_it) &&
  	    (sctp_it_ctl.cur_it->vn == curvnet)) {
  		sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_STOP_CUR_IT;
  	}
  	SCTP_ITERATOR_UNLOCK();
  #endif
  #if !(defined(__FreeBSD__) && !defined(__Userspace__))
  	SCTP_IPI_ITERATOR_WQ_DESTROY();
  	SCTP_ITERATOR_LOCK_DESTROY();
  #endif
  	SCTP_OS_TIMER_STOP_DRAIN(&SCTP_BASE_INFO(addr_wq_timer.timer));
  	SCTP_WQ_ADDR_LOCK();
  	LIST_FOREACH_SAFE(wi, &SCTP_BASE_INFO(addr_wq), sctp_nxt_addr, nwi) {
  		LIST_REMOVE(wi, sctp_nxt_addr);
  		SCTP_DECR_LADDR_COUNT();
  		if (wi->action == SCTP_DEL_IP_ADDRESS) {
  			SCTP_FREE(wi->ifa, SCTP_M_IFA);
  		}
  		SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_laddr), wi);
  	}
  	SCTP_WQ_ADDR_UNLOCK();
  
  	/*
  	 * free the vrf/ifn/ifa lists and hashes (be sure address monitor
  	 * is destroyed first).
  	 */
  	SCTP_IPI_ADDR_WLOCK();
  	vrf_bucket = &SCTP_BASE_INFO(sctp_vrfhash)[(SCTP_DEFAULT_VRFID & SCTP_BASE_INFO(hashvrfmark))];
  	LIST_FOREACH_SAFE(vrf, vrf_bucket, next_vrf, nvrf) {
  		LIST_FOREACH_SAFE(ifn, &vrf->ifnlist, next_ifn, nifn) {
  			LIST_FOREACH_SAFE(ifa, &ifn->ifalist, next_ifa, nifa) {
  				/* free the ifa */
  				LIST_REMOVE(ifa, next_bucket);
  				LIST_REMOVE(ifa, next_ifa);
  				SCTP_FREE(ifa, SCTP_M_IFA);
  			}
  			/* free the ifn */
  			LIST_REMOVE(ifn, next_bucket);
  			LIST_REMOVE(ifn, next_ifn);
  			SCTP_FREE(ifn, SCTP_M_IFN);
  		}
  		SCTP_HASH_FREE(vrf->vrf_addr_hash, vrf->vrf_addr_hashmark);
  		/* free the vrf */
  		LIST_REMOVE(vrf, next_vrf);
  		SCTP_FREE(vrf, SCTP_M_VRF);
  	}
  	SCTP_IPI_ADDR_WUNLOCK();
  	/* free the vrf hashes */
  	SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_vrfhash), SCTP_BASE_INFO(hashvrfmark));
  	SCTP_HASH_FREE(SCTP_BASE_INFO(vrf_ifn_hash), SCTP_BASE_INFO(vrf_ifn_hashmark));
  
  	/* free the TIMEWAIT list elements malloc'd in the function
  	 * sctp_add_vtag_to_timewait()...
  	 */
  	for (i = 0; i < SCTP_STACK_VTAG_HASH_SIZE; i++) {
  		chain = &SCTP_BASE_INFO(vtag_timewait)[i];
  		if (!LIST_EMPTY(chain)) {
  			prev_twait_block = NULL;
  			LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
  				if (prev_twait_block) {
  					SCTP_FREE(prev_twait_block, SCTP_M_TIMW);
  				}
  				prev_twait_block = twait_block;
  			}
  			SCTP_FREE(prev_twait_block, SCTP_M_TIMW);
  		}
  	}
  
  	/* free the locks and mutexes */
  #if defined(__APPLE__) && !defined(__Userspace__)
  	SCTP_TIMERQ_LOCK_DESTROY();
  #endif
  #ifdef SCTP_PACKET_LOGGING
  	SCTP_IP_PKTLOG_DESTROY();
  #endif
  	SCTP_IPI_ADDR_DESTROY();
  #if defined(__APPLE__) && !defined(__Userspace__)
  	SCTP_IPI_COUNT_DESTROY();
  #endif
  	SCTP_STATLOG_DESTROY();
  	SCTP_INP_INFO_LOCK_DESTROY();
  
  	SCTP_WQ_ADDR_DESTROY();
  
  #if defined(__APPLE__) && !defined(__Userspace__)
  #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD) || defined(APPLE_LION) || defined(APPLE_MOUNTAINLION)
  	lck_grp_attr_free(SCTP_BASE_INFO(sctbinfo).mtx_grp_attr);
  	lck_grp_free(SCTP_BASE_INFO(sctbinfo).mtx_grp);
  	lck_attr_free(SCTP_BASE_INFO(sctbinfo).mtx_attr);
  #else
  	lck_grp_attr_free(SCTP_BASE_INFO(sctbinfo).ipi_lock_grp_attr);
  	lck_grp_free(SCTP_BASE_INFO(sctbinfo).ipi_lock_grp);
  	lck_attr_free(SCTP_BASE_INFO(sctbinfo).ipi_lock_attr);
  #endif
  #endif
  #if defined(__Userspace__)
  	SCTP_TIMERQ_LOCK_DESTROY();
  	SCTP_ZONE_DESTROY(zone_mbuf);
  	SCTP_ZONE_DESTROY(zone_clust);
  	SCTP_ZONE_DESTROY(zone_ext_refcnt);
  #endif
  	/* Get rid of other stuff too. */
  	if (SCTP_BASE_INFO(sctp_asochash) != NULL)
  		SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_asochash), SCTP_BASE_INFO(hashasocmark));
  	if (SCTP_BASE_INFO(sctp_ephash) != NULL)
  		SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_ephash), SCTP_BASE_INFO(hashmark));
  	if (SCTP_BASE_INFO(sctp_tcpephash) != NULL)
  		SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_tcpephash), SCTP_BASE_INFO(hashtcpmark));
  
  #if defined(_WIN32) || defined(__FreeBSD__) || defined(__Userspace__)
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_ep));
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asoc));
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_laddr));
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_net));
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_chunk));
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_readq));
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_strmoq));
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asconf));
  	SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asconf_ack));
  #endif
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #if defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
  	SCTP_FREE(SCTP_BASE_STATS, SCTP_M_MCORE);
  #endif
  #endif
  }
  
  int
  sctp_load_addresses_from_init(struct sctp_tcb *stcb, struct mbuf *m,
                                int offset, int limit,
                                struct sockaddr *src, struct sockaddr *dst,
                                struct sockaddr *altsa, uint16_t port)
  {
  	/*
  	 * 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;
  	struct sctp_nets *net, *nnet, *net_tmp;
  	struct sctp_paramhdr *phdr, param_buf;
  	struct sctp_tcb *stcb_tmp;
  	uint16_t ptype, plen;
  	struct sockaddr *sa;
  	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;
  	uint8_t peer_supports_ecn;
  	uint8_t peer_supports_prsctp;
  	uint8_t peer_supports_auth;
  	uint8_t peer_supports_asconf;
  	uint8_t peer_supports_asconf_ack;
  	uint8_t peer_supports_reconfig;
  	uint8_t peer_supports_nrsack;
  	uint8_t peer_supports_pktdrop;
  	uint8_t peer_supports_idata;
  #ifdef INET
  	struct sockaddr_in sin;
  #endif
  #ifdef INET6
  	struct sockaddr_in6 sin6;
  #endif
  
  	/* First get the destination address setup too. */
  #ifdef INET
  	memset(&sin, 0, sizeof(sin));
  	sin.sin_family = AF_INET;
  #ifdef HAVE_SIN_LEN
  	sin.sin_len = sizeof(sin);
  #endif
  	sin.sin_port = stcb->rport;
  #endif
  #ifdef INET6
  	memset(&sin6, 0, sizeof(sin6));
  	sin6.sin6_family = AF_INET6;
  #ifdef HAVE_SIN6_LEN
  	sin6.sin6_len = sizeof(struct sockaddr_in6);
  #endif
  	sin6.sin6_port = stcb->rport;
  #endif
  	if (altsa) {
  		sa = altsa;
  	} else {
  		sa = src;
  	}
  	peer_supports_idata = 0;
  	peer_supports_ecn = 0;
  	peer_supports_prsctp = 0;
  	peer_supports_auth = 0;
  	peer_supports_asconf = 0;
  	peer_supports_asconf_ack = 0;
  	peer_supports_reconfig = 0;
  	peer_supports_nrsack = 0;
  	peer_supports_pktdrop = 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 */
  	inp = stcb->sctp_ep;
  	atomic_add_int(&stcb->asoc.refcnt, 1);
  	stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net_tmp, dst, 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. */
  		switch (sa->sa_family) {
  #ifdef INET
  		case AF_INET:
  			if (stcb->asoc.scope.ipv4_addr_legal) {
  				if (sctp_add_remote_addr(stcb, sa, NULL, port, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_2)) {
  					return (-1);
  				}
  			}
  			break;
  #endif
  #ifdef INET6
  		case AF_INET6:
  			if (stcb->asoc.scope.ipv6_addr_legal) {
  				if (sctp_add_remote_addr(stcb, sa, NULL, port, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_3)) {
  					return (-2);
  				}
  			}
  			break;
  #endif
  #if defined(__Userspace__)
  		case AF_CONN:
  			if (stcb->asoc.scope.conn_addr_legal) {
  				if (sctp_add_remote_addr(stcb, sa, NULL, port, SCTP_DONOT_SETSCOPE, SCTP_LOAD_ADDR_3)) {
  					return (-2);
  				}
  			}
  			break;
  #endif
  		default:
  			break;
  		}
  	} 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);
  	}
  	/* now we must go through each of the params. */
  	phdr = sctp_get_next_param(m, offset, &param_buf, sizeof(param_buf));
  	while (phdr) {
  		ptype = ntohs(phdr->param_type);
  		plen = ntohs(phdr->param_length);
  		/*
  		 * SCTP_PRINTF("ptype => %0x, plen => %d\n", (uint32_t)ptype,
  		 * (int)plen);
  		 */
  		if (offset + plen > limit) {
  			break;
  		}
  		if (plen < sizeof(struct sctp_paramhdr)) {
  			break;
  		}
  #ifdef INET
  		if (ptype == SCTP_IPV4_ADDRESS) {
  			if (stcb->asoc.scope.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(ntohl(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,
  									dst, 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
  					 */
  				add_it_now:
  					if (stcb->asoc.state == 0) {
  						/* the assoc was freed? */
  						return (-7);
  					}
  					if (sctp_add_remote_addr(stcb, sa, NULL, port, 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) {
  						if (SCTP_GET_STATE(stcb_tmp) == SCTP_STATE_COOKIE_WAIT) {
  							struct mbuf *op_err;
  							char msg[SCTP_DIAG_INFO_LEN];
  
  							/* in setup state we abort this guy */
  							SCTP_SNPRINTF(msg, sizeof(msg),
  							              "%s:%d at %s", __FILE__, __LINE__, __func__);
  							op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  							         msg);
  							sctp_abort_an_association(stcb_tmp->sctp_ep,
  										  stcb_tmp, op_err,
  							                          SCTP_SO_NOT_LOCKED);
  							goto add_it_now;
  						}
  						SCTP_TCB_UNLOCK(stcb_tmp);
  					}
  
  					if (stcb->asoc.state == 0) {
  						/* the assoc was freed? */
  						return (-12);
  					}
  					return (-13);
  				}
  			}
  		} else
  #endif
  #ifdef INET6
  		if (ptype == SCTP_IPV6_ADDRESS) {
  			if (stcb->asoc.scope.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,
  									dst, 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
  					 */
  				add_it_now6:
  					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, NULL, port, 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) {
  						if (SCTP_GET_STATE(stcb_tmp) == SCTP_STATE_COOKIE_WAIT) {
  							struct mbuf *op_err;
  							char msg[SCTP_DIAG_INFO_LEN];
  
  							/* in setup state we abort this guy */
  							SCTP_SNPRINTF(msg, sizeof(msg),
  							              "%s:%d at %s", __FILE__, __LINE__, __func__);
  							op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  							         msg);
  							sctp_abort_an_association(stcb_tmp->sctp_ep,
  										  stcb_tmp, op_err,
  							                          SCTP_SO_NOT_LOCKED);
  							goto add_it_now6;
  						}
  						SCTP_TCB_UNLOCK(stcb_tmp);
  					}
  					if (stcb->asoc.state == 0) {
  						/* the assoc was freed? */
  						return (-21);
  					}
  					return (-22);
  				}
  			}
  		} else
  #endif
  		if (ptype == SCTP_ECN_CAPABLE) {
  			peer_supports_ecn = 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;
  			int lptype;
  			struct sockaddr *lsa = NULL;
  #ifdef INET
  			struct sctp_asconf_addrv4_param *fii;
  #endif
  
  			if (stcb->asoc.asconf_supported == 0) {
  				return (-100);
  			}
  			if (plen > sizeof(lstore)) {
  				return (-23);
  			}
  			if (plen < sizeof(struct sctp_asconf_addrv4_param)) {
  				return (-101);
  			}
  			phdr = sctp_get_next_param(m, offset,
  						   (struct sctp_paramhdr *)&lstore,
  						   plen);
  			if (phdr == NULL) {
  				return (-24);
  			}
  			fee = (struct sctp_asconf_addr_param *)phdr;
  			lptype = ntohs(fee->addrp.ph.param_type);
  			switch (lptype) {
  #ifdef INET
  			case 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;
  				}
  				break;
  #endif
  #ifdef INET6
  			case 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;
  				}
  				break;
  #endif
  			default:
  				break;
  			}
  			if (lsa) {
  				(void)sctp_set_primary_addr(stcb, sa, NULL);
  			}
  		} else if (ptype == SCTP_HAS_NAT_SUPPORT) {
  			stcb->asoc.peer_supports_nat = 1;
  		} else if (ptype == SCTP_PRSCTP_SUPPORTED) {
  			/* Peer supports pr-sctp */
  			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;
  
  			if (plen > sizeof(local_store)) {
  				return (-35);
  			}
  			phdr = sctp_get_next_param(m, offset,
  						   (struct sctp_paramhdr *)&local_store, plen);
  			if (phdr == NULL) {
  				return (-25);
  			}
  			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:
  					peer_supports_asconf = 1;
  					break;
  				case SCTP_ASCONF_ACK:
  					peer_supports_asconf_ack = 1;
  					break;
  				case SCTP_FORWARD_CUM_TSN:
  					peer_supports_prsctp = 1;
  					break;
  				case SCTP_PACKET_DROPPED:
  					peer_supports_pktdrop = 1;
  					break;
  				case SCTP_NR_SELECTIVE_ACK:
  					peer_supports_nrsack = 1;
  					break;
  				case SCTP_STREAM_RESET:
  					peer_supports_reconfig = 1;
  					break;
  				case SCTP_AUTHENTICATION:
  					peer_supports_auth = 1;
  					break;
  				case SCTP_IDATA:
  					peer_supports_idata = 1;
  					break;
  				default:
  					/* one I have not learned yet */
  					break;
  				}
  			}
  		} 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,
  						   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) {
  			uint16_t num_hmacs;
  			uint16_t 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,
  						   plen);
  			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,
  						   plen);
  			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, &param_buf,
  		                           sizeof(param_buf));
  	}
  	/* Now check to see if we need to purge any addresses */
  	TAILQ_FOREACH_SAFE(net, &stcb->asoc.nets, sctp_next, nnet) {
  		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);
  			if (net == stcb->asoc.alternate) {
  				sctp_free_remote_addr(stcb->asoc.alternate);
  				stcb->asoc.alternate = NULL;
  			}
  			if (net == stcb->asoc.primary_destination) {
  				stcb->asoc.primary_destination = NULL;
  				sctp_select_primary_destination(stcb);
  			}
  			sctp_free_remote_addr(net);
  		}
  	}
  	if ((stcb->asoc.ecn_supported == 1) &&
  	    (peer_supports_ecn == 0)) {
  		stcb->asoc.ecn_supported = 0;
  	}
  	if ((stcb->asoc.prsctp_supported == 1) &&
  	    (peer_supports_prsctp == 0)) {
  		stcb->asoc.prsctp_supported = 0;
  	}
  	if ((stcb->asoc.auth_supported == 1) &&
  	    ((peer_supports_auth == 0) ||
  	     (got_random == 0) || (got_hmacs == 0))) {
  		stcb->asoc.auth_supported = 0;
  	}
  	if ((stcb->asoc.asconf_supported == 1) &&
  	    ((peer_supports_asconf == 0) || (peer_supports_asconf_ack == 0) ||
  	     (stcb->asoc.auth_supported == 0) ||
  	     (saw_asconf == 0) || (saw_asconf_ack == 0))) {
  		stcb->asoc.asconf_supported = 0;
  	}
  	if ((stcb->asoc.reconfig_supported == 1) &&
  	    (peer_supports_reconfig == 0)) {
  		stcb->asoc.reconfig_supported = 0;
  	}
  	if ((stcb->asoc.idata_supported == 1) &&
  	    (peer_supports_idata == 0)) {
  		stcb->asoc.idata_supported = 0;
  	}
  	if ((stcb->asoc.nrsack_supported == 1) &&
  	    (peer_supports_nrsack == 0)) {
  		stcb->asoc.nrsack_supported = 0;
  	}
  	if ((stcb->asoc.pktdrop_supported == 1) &&
  	    (peer_supports_pktdrop == 0)){
  		stcb->asoc.pktdrop_supported = 0;
  	}
  	/* validate authentication required parameters */
  	if ((peer_supports_auth == 0) && (got_chklist == 1)) {
  		/* peer does not support auth but sent a chunks list? */
  		return (-31);
  	}
  	if ((peer_supports_asconf == 1) && (peer_supports_auth == 0)) {
  		/* peer supports asconf but not auth? */
  		return (-32);
  	} else if ((peer_supports_asconf == 1) &&
  	           (peer_supports_auth == 1) &&
  		   ((saw_asconf == 0) || (saw_asconf_ack == 0))) {
  		return (-33);
  	}
  	/* concatenate the full random key */
  	keylen = sizeof(*p_random) + random_len + sizeof(*hmacs) + hmacs_len;
  	if (chunks != NULL) {
  		keylen += sizeof(*chunks) + num_chunks;
  	}
  	new_key = sctp_alloc_key(keylen);
  	if (new_key != NULL) {
  		/* copy in the RANDOM */
  		if (p_random != NULL) {
  			keylen = sizeof(*p_random) + random_len;
  			memcpy(new_key->key, p_random, keylen);
  		} else {
  			keylen = 0;
  		}
  		/* append in the AUTH chunks */
  		if (chunks != NULL) {
  			memcpy(new_key->key + keylen, chunks,
  			       sizeof(*chunks) + num_chunks);
  			keylen += sizeof(*chunks) + num_chunks;
  		}
  		/* append in the HMACs */
  		if (hmacs != NULL) {
  			memcpy(new_key->key + keylen, hmacs,
  			       sizeof(*hmacs) + hmacs_len);
  		}
  	} 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;
  	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;
  		if (!(net->dest_state & SCTP_ADDR_PF) && (stcb->asoc.alternate)) {
  			sctp_free_remote_addr(stcb->asoc.alternate);
  			stcb->asoc.alternate = NULL;
  		}
  		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 efficient 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(uint32_t tag, uint16_t lport, uint16_t rport, struct timeval *now)
  {
  	/*
  	 * 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 sctpvtaghead *chain;
  	struct sctp_tagblock *twait_block;
  	struct sctpasochead *head;
  	struct sctp_tcb *stcb;
  	int i;
  
  	SCTP_INP_INFO_RLOCK();
  	head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
  								SCTP_BASE_INFO(hashasocmark))];
  	LIST_FOREACH(stcb, head, sctp_asocs) {
  		/* We choose not to lock anything here. TCB's can't be
  		 * removed since we have the read lock, so they can't
  		 * be freed on us, same thing for the INP. I may
  		 * be wrong with this assumption, but we will go
  		 * with it for now :-)
  		 */
  		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
  			continue;
  		}
  		if (stcb->asoc.my_vtag == tag) {
  			/* candidate */
  			if (stcb->rport != rport) {
  				continue;
  			}
  			if (stcb->sctp_ep->sctp_lport != lport) {
  				continue;
  			}
  			/* Its a used tag set */
  			SCTP_INP_INFO_RUNLOCK();
  			return (0);
  		}
  	}
  	chain = &SCTP_BASE_INFO(vtag_timewait)[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
  	/* Now what about timed wait ? */
  	LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
  		/*
  		 * Block(s) are present, lets see if we have this tag in the
  		 * list
  		 */
  		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;
  				twait_block->vtag_block[i].lport = 0;
  				twait_block->vtag_block[i].rport = 0;
  			} else if ((twait_block->vtag_block[i].v_tag == tag) &&
  				   (twait_block->vtag_block[i].lport == lport) &&
  				   (twait_block->vtag_block[i].rport == rport)) {
  				/* Bad tag, sorry :< */
  				SCTP_INP_INFO_RUNLOCK();
  				return (0);
  			}
  		}
  	}
  	SCTP_INP_INFO_RUNLOCK();
  	return (1);
  }
  
  static void
  sctp_drain_mbufs(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;
  	struct sctp_queued_to_read *control, *ncontrol;
  	int cnt, strmat;
  	uint32_t gap, i;
  	int fnd = 0;
  
  	/* We look for anything larger than the cum-ack + 1 */
  
  	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;
  	/* Ok that was fun, now we will drain all the inbound streams? */
  	for (strmat = 0; strmat < asoc->streamincnt; strmat++) {
  		TAILQ_FOREACH_SAFE(control, &asoc->strmin[strmat].inqueue, next_instrm, ncontrol) {
  #ifdef INVARIANTS
  			if (control->on_strm_q != SCTP_ON_ORDERED) {
  				panic("Huh control: %p on_q: %d -- not ordered?",
  				      control, control->on_strm_q);
  			}
  #endif
  			if (SCTP_TSN_GT(control->sinfo_tsn, cumulative_tsn_p1)) {
  				/* Yep it is above cum-ack */
  				cnt++;
  				SCTP_CALC_TSN_TO_GAP(gap, control->sinfo_tsn, asoc->mapping_array_base_tsn);
  				KASSERT(control->length > 0, ("control has zero length"));
  				if (asoc->size_on_all_streams >= control->length) {
  					asoc->size_on_all_streams -= control->length;
  				} else {
  #ifdef INVARIANTS
  					panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length);
  #else
  					asoc->size_on_all_streams = 0;
  #endif
  				}
  				sctp_ucount_decr(asoc->cnt_on_all_streams);
  				SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
  				if (control->on_read_q) {
  					TAILQ_REMOVE(&stcb->sctp_ep->read_queue, control, next);
  					control->on_read_q = 0;
  				}
  				TAILQ_REMOVE(&asoc->strmin[strmat].inqueue, control, next_instrm);
  				control->on_strm_q = 0;
  				if (control->data) {
  					sctp_m_freem(control->data);
  					control->data = NULL;
  				}
  				sctp_free_remote_addr(control->whoFrom);
  				/* Now its reasm? */
  				TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
  					cnt++;
  					SCTP_CALC_TSN_TO_GAP(gap, chk->rec.data.tsn, asoc->mapping_array_base_tsn);
  					KASSERT(chk->send_size > 0, ("chunk has zero length"));
  					if (asoc->size_on_reasm_queue >= chk->send_size) {
  						asoc->size_on_reasm_queue -= chk->send_size;
  					} else {
  #ifdef INVARIANTS
  						panic("size_on_reasm_queue = %u smaller than chunk length %u", asoc->size_on_reasm_queue, chk->send_size);
  #else
  						asoc->size_on_reasm_queue = 0;
  #endif
  					}
  					sctp_ucount_decr(asoc->cnt_on_reasm_queue);
  					SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
  					TAILQ_REMOVE(&control->reasm, chk, sctp_next);
  					if (chk->data) {
  						sctp_m_freem(chk->data);
  						chk->data = NULL;
  					}
  					sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  				}
  				sctp_free_a_readq(stcb, control);
  			}
  		}
  		TAILQ_FOREACH_SAFE(control, &asoc->strmin[strmat].uno_inqueue, next_instrm, ncontrol) {
  #ifdef INVARIANTS
  			if (control->on_strm_q != SCTP_ON_UNORDERED) {
  				panic("Huh control: %p on_q: %d -- not unordered?",
  				      control, control->on_strm_q);
  			}
  #endif
  			if (SCTP_TSN_GT(control->sinfo_tsn, cumulative_tsn_p1)) {
  				/* Yep it is above cum-ack */
  				cnt++;
  				SCTP_CALC_TSN_TO_GAP(gap, control->sinfo_tsn, asoc->mapping_array_base_tsn);
  				KASSERT(control->length > 0, ("control has zero length"));
  				if (asoc->size_on_all_streams >= control->length) {
  					asoc->size_on_all_streams -= control->length;
  				} else {
  #ifdef INVARIANTS
  					panic("size_on_all_streams = %u smaller than control length %u", asoc->size_on_all_streams, control->length);
  #else
  					asoc->size_on_all_streams = 0;
  #endif
  				}
  				sctp_ucount_decr(asoc->cnt_on_all_streams);
  				SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
  				if (control->on_read_q) {
  					TAILQ_REMOVE(&stcb->sctp_ep->read_queue, control, next);
  					control->on_read_q = 0;
  				}
  				TAILQ_REMOVE(&asoc->strmin[strmat].uno_inqueue, control, next_instrm);
  				control->on_strm_q = 0;
  				if (control->data) {
  					sctp_m_freem(control->data);
  					control->data = NULL;
  				}
  				sctp_free_remote_addr(control->whoFrom);
  				/* Now its reasm? */
  				TAILQ_FOREACH_SAFE(chk, &control->reasm, sctp_next, nchk) {
  					cnt++;
  					SCTP_CALC_TSN_TO_GAP(gap, chk->rec.data.tsn, asoc->mapping_array_base_tsn);
  					KASSERT(chk->send_size > 0, ("chunk has zero length"));
  					if (asoc->size_on_reasm_queue >= chk->send_size) {
  						asoc->size_on_reasm_queue -= chk->send_size;
  					} else {
  #ifdef INVARIANTS
  						panic("size_on_reasm_queue = %u smaller than chunk length %u", asoc->size_on_reasm_queue, chk->send_size);
  #else
  						asoc->size_on_reasm_queue = 0;
  #endif
  					}
  					sctp_ucount_decr(asoc->cnt_on_reasm_queue);
  					SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
  					TAILQ_REMOVE(&control->reasm, chk, sctp_next);
  					if (chk->data) {
  						sctp_m_freem(chk->data);
  						chk->data = NULL;
  					}
  					sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  				}
  				sctp_free_a_readq(stcb, control);
  			}
  		}
  	}
  	if (cnt) {
  		/* We must back down to see what the new highest is */
  		for (i = asoc->highest_tsn_inside_map; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
  			SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
  			if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
  				asoc->highest_tsn_inside_map = i;
  				fnd = 1;
  				break;
  			}
  		}
  		if (!fnd) {
  			asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
  		}
  
  		/*
  		 * 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
  		SCTPDBG(SCTP_DEBUG_PCB1, "Freed %d chunks from reneg harvest\n", cnt);
  #endif
  		/*
  		 * Now do we need to find a new
  		 * asoc->highest_tsn_inside_map?
  		 */
  		asoc->last_revoke_count = cnt;
  		sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
  		                SCTP_FROM_SCTP_PCB + SCTP_LOC_11);
  		/*sa_ignore NO_NULL_CHK*/
  		sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
  		sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_DRAIN, SCTP_SO_NOT_LOCKED);
  	}
  	/*
  	 * Another issue, in un-setting the TSN's in the mapping array we
  	 * DID NOT adjust the highest_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!
  	 */
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	VNET_ITERATOR_DECL(vnet_iter);
  #else
  	struct sctp_inpcb *inp;
  	struct sctp_tcb *stcb;
  
  	SCTP_STAT_INCR(sctps_protocol_drain_calls);
  	if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
  		return;
  	}
  #endif
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  	VNET_LIST_RLOCK_NOSLEEP();
  	VNET_FOREACH(vnet_iter) {
  		CURVNET_SET(vnet_iter);
  		struct sctp_inpcb *inp;
  		struct sctp_tcb *stcb;
  #endif
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  		SCTP_STAT_INCR(sctps_protocol_drain_calls);
  		if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
  #ifdef VIMAGE
  			continue;
  #else
  			return;
  #endif
  		}
  #endif
  		SCTP_INP_INFO_RLOCK();
  		LIST_FOREACH(inp, &SCTP_BASE_INFO(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(stcb);
  				SCTP_TCB_UNLOCK(stcb);
  			}
  			SCTP_INP_RUNLOCK(inp);
  		}
  		SCTP_INP_INFO_RUNLOCK();
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  		CURVNET_RESTORE();
  	}
  	VNET_LIST_RUNLOCK_NOSLEEP();
  #endif
  }
  
  /*
   * 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);
  	}
  	if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
  		SCTP_PRINTF("%s: abort on initialize being %d\n", __func__,
  		            SCTP_BASE_VAR(sctp_pcb_initialized));
  		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 (-1);
  	}
  	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 defined(__FreeBSD__) && !defined(__Userspace__)
  	it->vn = curvnet;
  #endif
  	if (s_inp) {
  		/* Assume lock is held here */
  		it->inp = s_inp;
  		SCTP_INP_INCR_REF(it->inp);
  		it->iterator_flags = SCTP_ITERATOR_DO_SINGLE_INP;
  	} else {
  		SCTP_INP_INFO_RLOCK();
  		it->inp = LIST_FIRST(&SCTP_BASE_INFO(listhead));
  		if (it->inp) {
  			SCTP_INP_INCR_REF(it->inp);
  		}
  		SCTP_INP_INFO_RUNLOCK();
  		it->iterator_flags = SCTP_ITERATOR_DO_ALL_INP;
  	}
  	SCTP_IPI_ITERATOR_WQ_LOCK();
  	if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
  		SCTP_IPI_ITERATOR_WQ_UNLOCK();
  		SCTP_PRINTF("%s: rollback on initialize being %d it=%p\n", __func__,
  		            SCTP_BASE_VAR(sctp_pcb_initialized), it);
  		SCTP_FREE(it, SCTP_M_ITER);
  		return (-1);
  	}
  	TAILQ_INSERT_TAIL(&sctp_it_ctl.iteratorhead, it, sctp_nxt_itr);
  	if (sctp_it_ctl.iterator_running == 0) {
  		sctp_wakeup_iterator();
  	}
  	SCTP_IPI_ITERATOR_WQ_UNLOCK();
  	/* sa_ignore MEMLEAK {memory is put on the tailq for the iterator} */
  	return (0);
  }
  