FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_asconf.c

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 2001-2007, 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <netinet/sctp_os.h>
    #include <netinet/sctp_var.h>
    #include <netinet/sctp_sysctl.h>
    #include <netinet/sctp_pcb.h>
    #include <netinet/sctp_header.h>
    #include <netinet/sctputil.h>
    #include <netinet/sctp_output.h>
    #include <netinet/sctp_asconf.h>
    #include <netinet/sctp_timer.h>
    
    /*
     * debug flags:
     * SCTP_DEBUG_ASCONF1: protocol info, general info and errors
     * SCTP_DEBUG_ASCONF2: detailed info
     */
    
    /*
     * RFC 5061
     *
     * An ASCONF parameter queue exists per asoc which holds the pending address
     * operations.  Lists are updated upon receipt of ASCONF-ACK.
     *
     * A restricted_addrs list exists per assoc to hold local addresses that are
     * not (yet) usable by the assoc as a source address.  These addresses are
     * either pending an ASCONF operation (and exist on the ASCONF parameter
     * queue), or they are permanently restricted (the peer has returned an
     * ERROR indication to an ASCONF(ADD), or the peer does not support ASCONF).
     *
     * Deleted addresses are always immediately removed from the lists as they will
     * (shortly) no longer exist in the kernel.  We send ASCONFs as a courtesy,
     * only if allowed.
     */
    
    /*
     * ASCONF parameter processing.
     * response_required: set if a reply is required (eg. SUCCESS_REPORT).
     * returns a mbuf to an "error" response parameter or NULL/"success" if ok.
     * FIX: allocating this many mbufs on the fly is pretty inefficient...
     */
    static struct mbuf *
    sctp_asconf_success_response(uint32_t id)
    {
            struct mbuf *m_reply = NULL;
            struct sctp_asconf_paramhdr *aph;
    
            m_reply = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_paramhdr),
                0, M_NOWAIT, 1, MT_DATA);
            if (m_reply == NULL) {
                    SCTPDBG(SCTP_DEBUG_ASCONF1,
                        "asconf_success_response: couldn't get mbuf!\n");
                    return (NULL);
            }
            aph = mtod(m_reply, struct sctp_asconf_paramhdr *);
            aph->correlation_id = id;
            aph->ph.param_type = htons(SCTP_SUCCESS_REPORT);
            aph->ph.param_length = sizeof(struct sctp_asconf_paramhdr);
            SCTP_BUF_LEN(m_reply) = aph->ph.param_length;
            aph->ph.param_length = htons(aph->ph.param_length);
    
            return (m_reply);
    }
    
   static struct mbuf *
   sctp_asconf_error_response(uint32_t id, uint16_t cause, uint8_t *error_tlv,
       uint16_t tlv_length)
   {
           struct mbuf *m_reply = NULL;
           struct sctp_asconf_paramhdr *aph;
           struct sctp_error_cause *error;
           uint32_t buf_len;
           uint16_t i, param_length, cause_length, padding_length;
           uint8_t *tlv;
   
           if (error_tlv == NULL) {
                   tlv_length = 0;
           }
           cause_length = sizeof(struct sctp_error_cause) + tlv_length;
           param_length = sizeof(struct sctp_asconf_paramhdr) + cause_length;
           padding_length = tlv_length % 4;
           if (padding_length != 0) {
                   padding_length = 4 - padding_length;
           }
           buf_len = param_length + padding_length;
           if (buf_len > MLEN) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "asconf_error_response: tlv_length (%xh) too big\n",
                       tlv_length);
                   return (NULL);
           }
           m_reply = sctp_get_mbuf_for_msg(buf_len, 0, M_NOWAIT, 1, MT_DATA);
           if (m_reply == NULL) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "asconf_error_response: couldn't get mbuf!\n");
                   return (NULL);
           }
           aph = mtod(m_reply, struct sctp_asconf_paramhdr *);
           aph->ph.param_type = htons(SCTP_ERROR_CAUSE_IND);
           aph->ph.param_length = htons(param_length);
           aph->correlation_id = id;
           error = (struct sctp_error_cause *)(aph + 1);
           error->code = htons(cause);
           error->length = htons(cause_length);
           if (error_tlv != NULL) {
                   tlv = (uint8_t *)(error + 1);
                   memcpy(tlv, error_tlv, tlv_length);
                   for (i = 0; i < padding_length; i++) {
                           tlv[tlv_length + i] = 0;
                   }
           }
           SCTP_BUF_LEN(m_reply) = buf_len;
           return (m_reply);
   }
   
   static struct mbuf *
   sctp_process_asconf_add_ip(struct sockaddr *src, struct sctp_asconf_paramhdr *aph,
       struct sctp_tcb *stcb, int send_hb, int response_required)
   {
           struct sctp_nets *net;
           struct mbuf *m_reply = NULL;
           union sctp_sockstore store;
           struct sctp_paramhdr *ph;
           uint16_t param_type, aparam_length;
   #if defined(INET) || defined(INET6)
           uint16_t param_length;
   #endif
           struct sockaddr *sa;
           int zero_address = 0;
           int bad_address = 0;
   #ifdef INET
           struct sockaddr_in *sin;
           struct sctp_ipv4addr_param *v4addr;
   #endif
   #ifdef INET6
           struct sockaddr_in6 *sin6;
           struct sctp_ipv6addr_param *v6addr;
   #endif
   
           aparam_length = ntohs(aph->ph.param_length);
           if (aparam_length < sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_paramhdr)) {
                   return (NULL);
           }
           ph = (struct sctp_paramhdr *)(aph + 1);
           param_type = ntohs(ph->param_type);
   #if defined(INET) || defined(INET6)
           param_length = ntohs(ph->param_length);
           if (param_length + sizeof(struct sctp_asconf_paramhdr) != aparam_length) {
                   return (NULL);
           }
   #endif
           sa = &store.sa;
           switch (param_type) {
   #ifdef INET
           case SCTP_IPV4_ADDRESS:
                   if (param_length != sizeof(struct sctp_ipv4addr_param)) {
                           /* invalid param size */
                           return (NULL);
                   }
                   v4addr = (struct sctp_ipv4addr_param *)ph;
                   sin = &store.sin;
                   memset(sin, 0, sizeof(*sin));
                   sin->sin_family = AF_INET;
                   sin->sin_len = sizeof(struct sockaddr_in);
                   sin->sin_port = stcb->rport;
                   sin->sin_addr.s_addr = v4addr->addr;
                   if ((sin->sin_addr.s_addr == INADDR_BROADCAST) ||
                       IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
                           bad_address = 1;
                   }
                   if (sin->sin_addr.s_addr == INADDR_ANY)
                           zero_address = 1;
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_add_ip: adding ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                   break;
   #endif
   #ifdef INET6
           case SCTP_IPV6_ADDRESS:
                   if (param_length != sizeof(struct sctp_ipv6addr_param)) {
                           /* invalid param size */
                           return (NULL);
                   }
                   v6addr = (struct sctp_ipv6addr_param *)ph;
                   sin6 = &store.sin6;
                   memset(sin6, 0, sizeof(*sin6));
                   sin6->sin6_family = AF_INET6;
                   sin6->sin6_len = sizeof(struct sockaddr_in6);
                   sin6->sin6_port = stcb->rport;
                   memcpy((caddr_t)&sin6->sin6_addr, v6addr->addr,
                       sizeof(struct in6_addr));
                   if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
                           bad_address = 1;
                   }
                   if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
                           zero_address = 1;
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_add_ip: adding ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                   break;
   #endif
           default:
                   m_reply = sctp_asconf_error_response(aph->correlation_id,
                       SCTP_CAUSE_INVALID_PARAM, (uint8_t *)aph,
                       aparam_length);
                   return (m_reply);
           }                       /* end switch */
   
           /* if 0.0.0.0/::0, add the source address instead */
           if (zero_address && SCTP_BASE_SYSCTL(sctp_nat_friendly)) {
                   sa = src;
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "process_asconf_add_ip: using source addr ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, src);
           }
           net = NULL;
           /* add the address */
           if (bad_address) {
                   m_reply = sctp_asconf_error_response(aph->correlation_id,
                       SCTP_CAUSE_INVALID_PARAM, (uint8_t *)aph,
                       aparam_length);
           } else if (sctp_add_remote_addr(stcb, sa, &net, stcb->asoc.port,
                       SCTP_DONOT_SETSCOPE,
               SCTP_ADDR_DYNAMIC_ADDED) != 0) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "process_asconf_add_ip: error adding address\n");
                   m_reply = sctp_asconf_error_response(aph->correlation_id,
                       SCTP_CAUSE_RESOURCE_SHORTAGE, (uint8_t *)aph,
                       aparam_length);
           } else {
                   if (response_required) {
                           m_reply =
                               sctp_asconf_success_response(aph->correlation_id);
                   }
                   if (net != NULL) {
                           /* notify upper layer */
                           sctp_ulp_notify(SCTP_NOTIFY_ASCONF_ADD_IP, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
                           sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
                           sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
                               stcb, net);
                           if (send_hb) {
                                   sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
                           }
                   }
           }
           return (m_reply);
   }
   
   static int
   sctp_asconf_del_remote_addrs_except(struct sctp_tcb *stcb, struct sockaddr *src)
   {
           struct sctp_nets *src_net, *net, *nnet;
   
           /* make sure the source address exists as a destination net */
           src_net = sctp_findnet(stcb, src);
           if (src_net == NULL) {
                   /* not found */
                   return (-1);
           }
   
           /* delete all destination addresses except the source */
           TAILQ_FOREACH_SAFE(net, &stcb->asoc.nets, sctp_next, nnet) {
                   if (net != src_net) {
                           /* delete this address */
                           SCTPDBG(SCTP_DEBUG_ASCONF1,
                               "asconf_del_remote_addrs_except: deleting ");
                           SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1,
                               (struct sockaddr *)&net->ro._l_addr);
                           /* notify upper layer */
                           sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0,
                               (struct sockaddr *)&net->ro._l_addr, SCTP_SO_NOT_LOCKED);
                           sctp_remove_net(stcb, net);
                   }
           }
           return (0);
   }
   
   static struct mbuf *
   sctp_process_asconf_delete_ip(struct sockaddr *src,
       struct sctp_asconf_paramhdr *aph,
       struct sctp_tcb *stcb, int response_required)
   {
           struct mbuf *m_reply = NULL;
           union sctp_sockstore store;
           struct sctp_paramhdr *ph;
           uint16_t param_type, aparam_length;
   #if defined(INET) || defined(INET6)
           uint16_t param_length;
   #endif
           struct sockaddr *sa;
           int zero_address = 0;
           int result;
   #ifdef INET
           struct sockaddr_in *sin;
           struct sctp_ipv4addr_param *v4addr;
   #endif
   #ifdef INET6
           struct sockaddr_in6 *sin6;
           struct sctp_ipv6addr_param *v6addr;
   #endif
   
           aparam_length = ntohs(aph->ph.param_length);
           if (aparam_length < sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_paramhdr)) {
                   return (NULL);
           }
           ph = (struct sctp_paramhdr *)(aph + 1);
           param_type = ntohs(ph->param_type);
   #if defined(INET) || defined(INET6)
           param_length = ntohs(ph->param_length);
           if (param_length + sizeof(struct sctp_asconf_paramhdr) != aparam_length) {
                   return (NULL);
           }
   #endif
           sa = &store.sa;
           switch (param_type) {
   #ifdef INET
           case SCTP_IPV4_ADDRESS:
                   if (param_length != sizeof(struct sctp_ipv4addr_param)) {
                           /* invalid param size */
                           return (NULL);
                   }
                   v4addr = (struct sctp_ipv4addr_param *)ph;
                   sin = &store.sin;
                   memset(sin, 0, sizeof(*sin));
                   sin->sin_family = AF_INET;
                   sin->sin_len = sizeof(struct sockaddr_in);
                   sin->sin_port = stcb->rport;
                   sin->sin_addr.s_addr = v4addr->addr;
                   if (sin->sin_addr.s_addr == INADDR_ANY)
                           zero_address = 1;
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "process_asconf_delete_ip: deleting ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                   break;
   #endif
   #ifdef INET6
           case SCTP_IPV6_ADDRESS:
                   if (param_length != sizeof(struct sctp_ipv6addr_param)) {
                           /* invalid param size */
                           return (NULL);
                   }
                   v6addr = (struct sctp_ipv6addr_param *)ph;
                   sin6 = &store.sin6;
                   memset(sin6, 0, sizeof(*sin6));
                   sin6->sin6_family = AF_INET6;
                   sin6->sin6_len = sizeof(struct sockaddr_in6);
                   sin6->sin6_port = stcb->rport;
                   memcpy(&sin6->sin6_addr, v6addr->addr,
                       sizeof(struct in6_addr));
                   if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
                           zero_address = 1;
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "process_asconf_delete_ip: deleting ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                   break;
   #endif
           default:
                   m_reply = sctp_asconf_error_response(aph->correlation_id,
                       SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *)aph,
                       aparam_length);
                   return (m_reply);
           }
   
           /* make sure the source address is not being deleted */
           if (sctp_cmpaddr(sa, src)) {
                   /* trying to delete the source address! */
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: tried to delete source addr\n");
                   m_reply = sctp_asconf_error_response(aph->correlation_id,
                       SCTP_CAUSE_DELETING_SRC_ADDR, (uint8_t *)aph,
                       aparam_length);
                   return (m_reply);
           }
   
           /* if deleting 0.0.0.0/::0, delete all addresses except src addr */
           if (zero_address && SCTP_BASE_SYSCTL(sctp_nat_friendly)) {
                   result = sctp_asconf_del_remote_addrs_except(stcb, src);
   
                   if (result) {
                           /* src address did not exist? */
                           SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: src addr does not exist?\n");
                           /* what error to reply with?? */
                           m_reply =
                               sctp_asconf_error_response(aph->correlation_id,
                               SCTP_CAUSE_REQUEST_REFUSED, (uint8_t *)aph,
                               aparam_length);
                   } else if (response_required) {
                           m_reply =
                               sctp_asconf_success_response(aph->correlation_id);
                   }
                   return (m_reply);
           }
   
           /* delete the address */
           result = sctp_del_remote_addr(stcb, sa);
           /*
            * note if result == -2, the address doesn't exist in the asoc but
            * since it's being deleted anyways, we just ack the delete -- but
            * this probably means something has already gone awry
            */
           if (result == -1) {
                   /* only one address in the asoc */
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: tried to delete last IP addr!\n");
                   m_reply = sctp_asconf_error_response(aph->correlation_id,
                       SCTP_CAUSE_DELETING_LAST_ADDR, (uint8_t *)aph,
                       aparam_length);
           } else {
                   if (response_required) {
                           m_reply = sctp_asconf_success_response(aph->correlation_id);
                   }
                   /* notify upper layer */
                   sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
           }
           return (m_reply);
   }
   
   static struct mbuf *
   sctp_process_asconf_set_primary(struct sockaddr *src,
       struct sctp_asconf_paramhdr *aph,
       struct sctp_tcb *stcb, int response_required)
   {
           struct mbuf *m_reply = NULL;
           union sctp_sockstore store;
           struct sctp_paramhdr *ph;
           uint16_t param_type, aparam_length;
   #if defined(INET) || defined(INET6)
           uint16_t param_length;
   #endif
           struct sockaddr *sa;
           int zero_address = 0;
   #ifdef INET
           struct sockaddr_in *sin;
           struct sctp_ipv4addr_param *v4addr;
   #endif
   #ifdef INET6
           struct sockaddr_in6 *sin6;
           struct sctp_ipv6addr_param *v6addr;
   #endif
   
           aparam_length = ntohs(aph->ph.param_length);
           if (aparam_length < sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_paramhdr)) {
                   return (NULL);
           }
           ph = (struct sctp_paramhdr *)(aph + 1);
           param_type = ntohs(ph->param_type);
   #if defined(INET) || defined(INET6)
           param_length = ntohs(ph->param_length);
           if (param_length + sizeof(struct sctp_asconf_paramhdr) != aparam_length) {
                   return (NULL);
           }
   #endif
           sa = &store.sa;
           switch (param_type) {
   #ifdef INET
           case SCTP_IPV4_ADDRESS:
                   if (param_length != sizeof(struct sctp_ipv4addr_param)) {
                           /* invalid param size */
                           return (NULL);
                   }
                   v4addr = (struct sctp_ipv4addr_param *)ph;
                   sin = &store.sin;
                   memset(sin, 0, sizeof(*sin));
                   sin->sin_family = AF_INET;
                   sin->sin_len = sizeof(struct sockaddr_in);
                   sin->sin_addr.s_addr = v4addr->addr;
                   if (sin->sin_addr.s_addr == INADDR_ANY)
                           zero_address = 1;
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_set_primary: ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                   break;
   #endif
   #ifdef INET6
           case SCTP_IPV6_ADDRESS:
                   if (param_length != sizeof(struct sctp_ipv6addr_param)) {
                           /* invalid param size */
                           return (NULL);
                   }
                   v6addr = (struct sctp_ipv6addr_param *)ph;
                   sin6 = &store.sin6;
                   memset(sin6, 0, sizeof(*sin6));
                   sin6->sin6_family = AF_INET6;
                   sin6->sin6_len = sizeof(struct sockaddr_in6);
                   memcpy((caddr_t)&sin6->sin6_addr, v6addr->addr,
                       sizeof(struct in6_addr));
                   if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
                           zero_address = 1;
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_set_primary: ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                   break;
   #endif
           default:
                   m_reply = sctp_asconf_error_response(aph->correlation_id,
                       SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *)aph,
                       aparam_length);
                   return (m_reply);
           }
   
           /* if 0.0.0.0/::0, use the source address instead */
           if (zero_address && SCTP_BASE_SYSCTL(sctp_nat_friendly)) {
                   sa = src;
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "process_asconf_set_primary: using source addr ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, src);
           }
           /* set the primary address */
           if (sctp_set_primary_addr(stcb, sa, NULL) == 0) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "process_asconf_set_primary: primary address set\n");
                   /* notify upper layer */
                   sctp_ulp_notify(SCTP_NOTIFY_ASCONF_SET_PRIMARY, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
                   if ((stcb->asoc.primary_destination->dest_state & SCTP_ADDR_REACHABLE) &&
                       ((stcb->asoc.primary_destination->dest_state & SCTP_ADDR_PF) == 0) &&
                       (stcb->asoc.alternate != NULL)) {
                           sctp_free_remote_addr(stcb->asoc.alternate);
                           stcb->asoc.alternate = NULL;
                   }
                   if (response_required) {
                           m_reply = sctp_asconf_success_response(aph->correlation_id);
                   }
                   /*
                    * Mobility adaptation. Ideally, when the reception of SET
                    * PRIMARY with DELETE IP ADDRESS of the previous primary
                    * destination, unacknowledged DATA are retransmitted
                    * immediately to the new primary destination for seamless
                    * handover. If the destination is UNCONFIRMED and marked to
                    * REQ_PRIM, The retransmission occur when reception of the
                    * HEARTBEAT-ACK.  (See sctp_handle_heartbeat_ack in
                    * sctp_input.c) Also, when change of the primary
                    * destination, it is better that all subsequent new DATA
                    * containing already queued DATA are transmitted to the new
                    * primary destination. (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)) &&
                       sctp_is_mobility_feature_on(stcb->sctp_ep,
                       SCTP_MOBILITY_PRIM_DELETED) &&
                       (stcb->asoc.primary_destination->dest_state &
                       SCTP_ADDR_UNCONFIRMED) == 0) {
                           sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
                               stcb->sctp_ep, stcb, NULL,
                               SCTP_FROM_SCTP_ASCONF + SCTP_LOC_1);
                           if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                               SCTP_MOBILITY_FASTHANDOFF)) {
                                   sctp_assoc_immediate_retrans(stcb,
                                       stcb->asoc.primary_destination);
                           }
                           if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                               SCTP_MOBILITY_BASE)) {
                                   sctp_move_chunks_from_net(stcb,
                                       stcb->asoc.deleted_primary);
                           }
                           sctp_delete_prim_timer(stcb->sctp_ep, stcb);
                   }
           } else {
                   /* couldn't set the requested primary address! */
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "process_asconf_set_primary: set primary failed!\n");
                   /* must have been an invalid address, so report */
                   m_reply = sctp_asconf_error_response(aph->correlation_id,
                       SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *)aph,
                       aparam_length);
           }
   
           return (m_reply);
   }
   
   /*
    * handles an ASCONF chunk.
    * if all parameters are processed ok, send a plain (empty) ASCONF-ACK
    */
   void
   sctp_handle_asconf(struct mbuf *m, unsigned int offset,
       struct sockaddr *src,
       struct sctp_asconf_chunk *cp, struct sctp_tcb *stcb,
       int first)
   {
           struct sctp_association *asoc;
           uint32_t serial_num;
           struct mbuf *n, *m_ack, *m_result, *m_tail;
           struct sctp_asconf_ack_chunk *ack_cp;
           struct sctp_asconf_paramhdr *aph;
           struct sctp_ipv6addr_param *p_addr;
           unsigned int asconf_limit, cnt;
           int error = 0;          /* did an error occur? */
   
           /* asconf param buffer */
           uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
           struct sctp_asconf_ack *ack, *ack_next;
   
           /* verify minimum length */
           if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_chunk)) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "handle_asconf: chunk too small = %xh\n",
                       ntohs(cp->ch.chunk_length));
                   return;
           }
           asoc = &stcb->asoc;
           serial_num = ntohl(cp->serial_number);
   
           if (SCTP_TSN_GE(asoc->asconf_seq_in, serial_num)) {
                   /* got a duplicate ASCONF */
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "handle_asconf: got duplicate serial number = %xh\n",
                       serial_num);
                   return;
           } else if (serial_num != (asoc->asconf_seq_in + 1)) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: incorrect serial number = %xh (expected next = %xh)\n",
                       serial_num, asoc->asconf_seq_in + 1);
                   return;
           }
   
           /* it's the expected "next" sequence number, so process it */
           asoc->asconf_seq_in = serial_num;       /* update sequence */
           /* get length of all the param's in the ASCONF */
           asconf_limit = offset + ntohs(cp->ch.chunk_length);
           SCTPDBG(SCTP_DEBUG_ASCONF1,
               "handle_asconf: asconf_limit=%u, sequence=%xh\n",
               asconf_limit, serial_num);
   
           if (first) {
                   /* delete old cache */
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: Now processing first ASCONF. Try to delete old cache\n");
   
                   TAILQ_FOREACH_SAFE(ack, &asoc->asconf_ack_sent, next, ack_next) {
                           if (ack->serial_number == serial_num)
                                   break;
                           SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: delete old(%u) < first(%u)\n",
                               ack->serial_number, serial_num);
                           TAILQ_REMOVE(&asoc->asconf_ack_sent, ack, next);
                           if (ack->data != NULL) {
                                   sctp_m_freem(ack->data);
                           }
                           SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), ack);
                   }
           }
   
           m_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_ack_chunk), 0,
               M_NOWAIT, 1, MT_DATA);
           if (m_ack == NULL) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "handle_asconf: couldn't get mbuf!\n");
                   return;
           }
           m_tail = m_ack;         /* current reply chain's tail */
   
           /* fill in ASCONF-ACK header */
           ack_cp = mtod(m_ack, struct sctp_asconf_ack_chunk *);
           ack_cp->ch.chunk_type = SCTP_ASCONF_ACK;
           ack_cp->ch.chunk_flags = 0;
           ack_cp->serial_number = htonl(serial_num);
           /* set initial lengths (eg. just an ASCONF-ACK), ntohx at the end! */
           SCTP_BUF_LEN(m_ack) = sizeof(struct sctp_asconf_ack_chunk);
           ack_cp->ch.chunk_length = sizeof(struct sctp_asconf_ack_chunk);
   
           /* skip the lookup address parameter */
           offset += sizeof(struct sctp_asconf_chunk);
           p_addr = (struct sctp_ipv6addr_param *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), (uint8_t *)&aparam_buf);
           if (p_addr == NULL) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1,
                       "handle_asconf: couldn't get lookup addr!\n");
                   /* respond with a missing/invalid mandatory parameter error */
                   sctp_m_freem(m_ack);
                   return;
           }
           /* skip lookup addr */
           offset += SCTP_SIZE32(ntohs(p_addr->ph.param_length));
           /* get pointer to first asconf param in ASCONF */
           aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_asconf_paramhdr), (uint8_t *)&aparam_buf);
           if (aph == NULL) {
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "Empty ASCONF received?\n");
                   goto send_reply;
           }
           /* process through all parameters */
           cnt = 0;
           while (aph != NULL) {
                   unsigned int param_length, param_type;
   
                   param_type = ntohs(aph->ph.param_type);
                   param_length = ntohs(aph->ph.param_length);
                   if (offset + param_length > asconf_limit) {
                           /* parameter goes beyond end of chunk! */
                           sctp_m_freem(m_ack);
                           return;
                   }
                   m_result = NULL;
   
                   if (param_length > sizeof(aparam_buf)) {
                           SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: param length (%u) larger than buffer size!\n", param_length);
                           sctp_m_freem(m_ack);
                           return;
                   }
                   if (param_length < sizeof(struct sctp_asconf_paramhdr)) {
                           SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: param length (%u) too short\n", param_length);
                           sctp_m_freem(m_ack);
                           return;
                   }
                   /* get the entire parameter */
                   aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf);
                   if (aph == NULL) {
                           SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: couldn't get entire param\n");
                           sctp_m_freem(m_ack);
                           return;
                   }
                   switch (param_type) {
                   case SCTP_ADD_IP_ADDRESS:
                           m_result = sctp_process_asconf_add_ip(src, aph, stcb,
                               (cnt < SCTP_BASE_SYSCTL(sctp_hb_maxburst)), error);
                           cnt++;
                           break;
                   case SCTP_DEL_IP_ADDRESS:
                           m_result = sctp_process_asconf_delete_ip(src, aph, stcb,
                               error);
                           break;
                   case SCTP_ERROR_CAUSE_IND:
                           /* not valid in an ASCONF chunk */
                           break;
                   case SCTP_SET_PRIM_ADDR:
                           m_result = sctp_process_asconf_set_primary(src, aph,
                               stcb, error);
                           break;
                   case SCTP_NAT_VTAGS:
                           SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: sees a NAT VTAG state parameter\n");
                           break;
                   case SCTP_SUCCESS_REPORT:
                           /* not valid in an ASCONF chunk */
                           break;
                   case SCTP_ULP_ADAPTATION:
                           /* FIX */
                           break;
                   default:
                           if ((param_type & 0x8000) == 0) {
                                   /* Been told to STOP at this param */
                                   asconf_limit = offset;
                                   /*
                                    * FIX FIX - We need to call
                                    * sctp_arethere_unrecognized_parameters()
                                    * to get a operr and send it for any
                                    * param's with the 0x4000 bit set OR do it
                                    * here ourselves... note we still must STOP
                                    * if the 0x8000 bit is clear.
                                    */
                           }
                           /* unknown/invalid param type */
                           break;
                   }               /* switch */
   
                   /* add any (error) result to the reply mbuf chain */
                   if (m_result != NULL) {
                           SCTP_BUF_NEXT(m_tail) = m_result;
                           m_tail = m_result;
                           ack_cp->ch.chunk_length += SCTP_BUF_LEN(m_result);
                           /* set flag to force success reports */
                           error = 1;
                   }
                   offset += SCTP_SIZE32(param_length);
                   /* update remaining ASCONF message length to process */
                   if (offset >= asconf_limit) {
                           /* no more data in the mbuf chain */
                           break;
                   }
                   /* get pointer to next asconf param */
                   aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset,
                       sizeof(struct sctp_asconf_paramhdr),
                       (uint8_t *)&aparam_buf);
                   if (aph == NULL) {
                           /* can't get an asconf paramhdr */
                           SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: can't get asconf param hdr!\n");
                           /* FIX ME - add error here... */
                   }
           }
   
   send_reply:
           ack_cp->ch.chunk_length = htons(ack_cp->ch.chunk_length);
           /* save the ASCONF-ACK reply */
           ack = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_asconf_ack),
               struct sctp_asconf_ack);
           if (ack == NULL) {
                   sctp_m_freem(m_ack);
                   return;
           }
           ack->serial_number = serial_num;
           ack->last_sent_to = NULL;
           ack->data = m_ack;
           ack->len = 0;
           for (n = m_ack; n != NULL; n = SCTP_BUF_NEXT(n)) {
                   ack->len += SCTP_BUF_LEN(n);
           }
           TAILQ_INSERT_TAIL(&stcb->asoc.asconf_ack_sent, ack, next);
   
           /* see if last_control_chunk_from is set properly (use IP src addr) */
           if (stcb->asoc.last_control_chunk_from == NULL) {
                   /*
                    * this could happen if the source address was just newly
                    * added
                    */
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: looking up net for IP source address\n");
                   SCTPDBG(SCTP_DEBUG_ASCONF1, "Looking for IP source: ");
                   SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, src);
                   /* look up the from address */
                   stcb->asoc.last_control_chunk_from = sctp_findnet(stcb, src);
   #ifdef SCTP_DEBUG
                   if (stcb->asoc.last_control_chunk_from == NULL) {
                           SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: IP source address not found?!\n");
                   }
   #endif
           }
   }
   
   /*
    * does the address match? returns 0 if not, 1 if so
    */
   static uint32_t
   sctp_asconf_addr_match(struct sctp_asconf_addr *aa, struct sockaddr *sa)
   {
           switch (sa->sa_family) {
   #ifdef INET6
           case AF_INET6:
                   {
                           /* XXX scopeid */
                           struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
   
                           if ((aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) &&
                               (memcmp(&aa->ap.addrp.addr, &sin6->sin6_addr,
                               sizeof(struct in6_addr)) == 0)) {
                                   return (1);
                           }
                           break;
                   }
   #endif
   #ifdef INET
           case AF_INET:
                   {
                           struct sockaddr_in *sin = (struct sockaddr_in *)sa;
   
                           if ((aa->ap.addrp.ph.param_type == SCTP_IPV4_ADDRESS) &&
                               (memcmp(&aa->ap.addrp.addr, &sin->sin_addr,
                               sizeof(struct in_addr)) == 0)) {
                                   return (1);
                           }
                           break;
                   }
   #endif
           default:
                   break;
           }
           return (0);
   }
   
   /*
    * does the address match? returns 0 if not, 1 if so
    */
   static uint32_t
   sctp_addr_match(struct sctp_paramhdr *ph, struct sockaddr *sa)
   {
   #if defined(INET) || defined(INET6)
           uint16_t param_type, param_length;
   
           param_type = ntohs(ph->param_type);
           param_length = ntohs(ph->param_length);
   #endif
           switch (sa->sa_family) {
   #ifdef INET6
           case AF_INET6:
                   {
                           /* XXX scopeid */
                           struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
                           struct sctp_ipv6addr_param *v6addr;
   
                           v6addr = (struct sctp_ipv6addr_param *)ph;
                           if ((param_type == SCTP_IPV6_ADDRESS) &&
                               (param_length == sizeof(struct sctp_ipv6addr_param)) &&
                               (memcmp(&v6addr->addr, &sin6->sin6_addr,
                               sizeof(struct in6_addr)) == 0)) {
                                   return (1);
                           }
                           break;
                   }
   #endif
   #ifdef INET
           case AF_INET:
                   {
                           struct sockaddr_in *sin = (struct sockaddr_in *)sa;
                           struct sctp_ipv4addr_param *v4addr;
   
                           v4addr = (struct sctp_ipv4addr_param *)ph;
                           if ((param_type == SCTP_IPV4_ADDRESS) &&
                               (param_length == sizeof(struct sctp_ipv4addr_param)) &&
                               (memcmp(&v4addr->addr, &sin->sin_addr,
                               sizeof(struct in_addr)) == 0)) {
                                   return (1);
                           }
                           break;
                   }
   #endif
           default:
                   break;
           }
           return (0);
   }
   
   /*
    * Cleanup for non-responded/OP ERR'd ASCONF
    */
   void
   sctp_asconf_cleanup(struct sctp_tcb *stcb)
   {
           /*
            * clear out any existing asconfs going out
            */
           sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, NULL,
               SCTP_FROM_SCTP_ASCONF + SCTP_LOC_2);
           stcb->asoc.asconf_seq_out_acked = stcb->asoc.asconf_seq_out;
           /* remove the old ASCONF on our outbound queue */
           sctp_toss_old_asconf(stcb);
   }
   
   /*
    * cleanup any cached source addresses that may be topologically
    * incorrect after a new address has been added to this interface.
    */
   static void
   sctp_asconf_nets_cleanup(struct sctp_tcb *stcb, struct sctp_ifn *ifn)
   {
           struct sctp_nets *net;
   
           /*
            * Ideally, we want to only clear cached routes and source addresses
            * that are topologically incorrect.  But since there is no easy way
            * to know whether the newly added address on the ifn would cause a
            * routing change (i.e. a new egress interface would be chosen)
            * without doing a new routing lookup and source address selection,
            * we will (for now) just flush any cached route using a different
            * ifn (and cached source addrs) and let output re-choose them
            * during the next send on that net.
            */
           TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                   /*
                    * clear any cached route (and cached source address) if the
                    * route's interface is NOT the same as the address change.
                    * If it's the same interface, just clear the cached source
                    * address.
                    */
                   if (SCTP_ROUTE_HAS_VALID_IFN(&net->ro) &&
                       ((ifn == NULL) ||
                       (SCTP_GET_IF_INDEX_FROM_ROUTE(&net->ro) != ifn->ifn_index))) {
                           /* clear any cached route */
                           RO_NHFREE(&net->ro);
                   }
                   /* clear any cached source address */
                   if (net->src_addr_selected) {
                           sctp_free_ifa(net->ro._s_addr);
                           net->ro._s_addr = NULL;
                           net->src_addr_selected = 0;
                   }
           }
   }
   
   void
   sctp_assoc_immediate_retrans(struct sctp_tcb *stcb, struct sctp_nets *dstnet)
   {
           int error;
   
           if (dstnet->dest_state & SCTP_ADDR_UNCONFIRMED) {
                   return;
           }
          if (stcb->asoc.deleted_primary == NULL) {
                  return;
          }
  
          if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "assoc_immediate_retrans: Deleted primary is ");
                  SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "Current Primary is ");
                  SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.primary_destination->ro._l_addr.sa);
                  sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb,
                      stcb->asoc.deleted_primary,
                      SCTP_FROM_SCTP_ASCONF + SCTP_LOC_3);
                  stcb->asoc.num_send_timers_up--;
                  if (stcb->asoc.num_send_timers_up < 0) {
                          stcb->asoc.num_send_timers_up = 0;
                  }
                  SCTP_TCB_LOCK_ASSERT(stcb);
                  error = sctp_t3rxt_timer(stcb->sctp_ep, stcb,
                      stcb->asoc.deleted_primary);
                  if (error) {
                          SCTP_INP_DECR_REF(stcb->sctp_ep);
                          return;
                  }
                  SCTP_TCB_LOCK_ASSERT(stcb);
  #ifdef SCTP_AUDITING_ENABLED
                  sctp_auditing(4, stcb->sctp_ep, stcb, stcb->asoc.deleted_primary);
  #endif
                  sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
                  if ((stcb->asoc.num_send_timers_up == 0) &&
                      (stcb->asoc.sent_queue_cnt > 0)) {
                          struct sctp_tmit_chunk *chk;
  
                          TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
                                  if (chk->whoTo != NULL) {
                                          break;
                                  }
                          }
                          if (chk != NULL) {
                                  sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
                          }
                  }
          }
          return;
  }
  
  static int
      sctp_asconf_queue_mgmt(struct sctp_tcb *, struct sctp_ifa *, uint16_t);
  
  void
  sctp_net_immediate_retrans(struct sctp_tcb *stcb, struct sctp_nets *net)
  {
          struct sctp_tmit_chunk *chk;
  
          SCTPDBG(SCTP_DEBUG_ASCONF1, "net_immediate_retrans: RTO is %d\n", net->RTO);
          sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net,
              SCTP_FROM_SCTP_ASCONF + SCTP_LOC_4);
          stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb, net);
          net->error_count = 0;
          TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
                  if (chk->whoTo == net) {
                          if (chk->sent < SCTP_DATAGRAM_RESEND) {
                                  chk->sent = SCTP_DATAGRAM_RESEND;
                                  sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
                                  sctp_flight_size_decrease(chk);
                                  sctp_total_flight_decrease(stcb, chk);
                                  net->marked_retrans++;
                                  stcb->asoc.marked_retrans++;
                          }
                  }
          }
          if (net->marked_retrans) {
                  sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
          }
  }
  
  static void
  sctp_path_check_and_react(struct sctp_tcb *stcb, struct sctp_ifa *newifa)
  {
          struct sctp_nets *net;
          int addrnum, changed;
  
          /*
           * If number of local valid addresses is 1, the valid address is
           * probably newly added address. Several valid addresses in this
           * association.  A source address may not be changed.  Additionally,
           * they can be configured on a same interface as "alias" addresses.
           * (by micchie)
           */
          addrnum = sctp_local_addr_count(stcb);
          SCTPDBG(SCTP_DEBUG_ASCONF1, "p_check_react(): %d local addresses\n",
              addrnum);
          if (addrnum == 1) {
                  TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                          /* clear any cached route and source address */
                          RO_NHFREE(&net->ro);
                          if (net->src_addr_selected) {
                                  sctp_free_ifa(net->ro._s_addr);
                                  net->ro._s_addr = NULL;
                                  net->src_addr_selected = 0;
                          }
                          /* Retransmit unacknowledged DATA chunks immediately */
                          if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                              SCTP_MOBILITY_FASTHANDOFF)) {
                                  sctp_net_immediate_retrans(stcb, net);
                          }
                          /* also, SET PRIMARY is maybe already sent */
                  }
                  return;
          }
  
          /* Multiple local addresses exist in the association.  */
          TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                  /* clear any cached route and source address */
                  RO_NHFREE(&net->ro);
                  if (net->src_addr_selected) {
                          sctp_free_ifa(net->ro._s_addr);
                          net->ro._s_addr = NULL;
                          net->src_addr_selected = 0;
                  }
                  /*
                   * Check if the nexthop is corresponding to the new address.
                   * If the new address is corresponding to the current
                   * nexthop, the path will be changed. If the new address is
                   * NOT corresponding to the current nexthop, the path will
                   * not be changed.
                   */
                  SCTP_RTALLOC((sctp_route_t *)&net->ro,
                      stcb->sctp_ep->def_vrf_id,
                      stcb->sctp_ep->fibnum);
                  if (net->ro.ro_nh == NULL)
                          continue;
  
                  changed = 0;
                  switch (net->ro._l_addr.sa.sa_family) {
  #ifdef INET
                  case AF_INET:
                          if (sctp_v4src_match_nexthop(newifa, (sctp_route_t *)&net->ro)) {
                                  changed = 1;
                          }
                          break;
  #endif
  #ifdef INET6
                  case AF_INET6:
                          if (sctp_v6src_match_nexthop(
                              &newifa->address.sin6, (sctp_route_t *)&net->ro)) {
                                  changed = 1;
                          }
                          break;
  #endif
                  default:
                          break;
                  }
                  /*
                   * if the newly added address does not relate routing
                   * information, we skip.
                   */
                  if (changed == 0)
                          continue;
                  /* Retransmit unacknowledged DATA chunks immediately */
                  if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                      SCTP_MOBILITY_FASTHANDOFF)) {
                          sctp_net_immediate_retrans(stcb, net);
                  }
                  /* Send SET PRIMARY for this new address */
                  if (net == stcb->asoc.primary_destination) {
                          (void)sctp_asconf_queue_mgmt(stcb, newifa,
                              SCTP_SET_PRIM_ADDR);
                  }
          }
  }
  
  /*
   * process an ADD/DELETE IP ack from peer.
   * addr: corresponding sctp_ifa to the address being added/deleted.
   * type: SCTP_ADD_IP_ADDRESS or SCTP_DEL_IP_ADDRESS.
   * flag: 1=success, 0=failure.
   */
  static void
  sctp_asconf_addr_mgmt_ack(struct sctp_tcb *stcb, struct sctp_ifa *addr, uint32_t flag)
  {
          /*
           * do the necessary asoc list work- if we get a failure indication,
           * leave the address on the assoc's restricted list.  If we get a
           * success indication, remove the address from the restricted list.
           */
          /*
           * Note: this will only occur for ADD_IP_ADDRESS, since
           * DEL_IP_ADDRESS is never actually added to the list...
           */
          if (flag) {
                  /* success case, so remove from the restricted list */
                  sctp_del_local_addr_restricted(stcb, addr);
  
                  if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                      SCTP_MOBILITY_BASE) ||
                      sctp_is_mobility_feature_on(stcb->sctp_ep,
                      SCTP_MOBILITY_FASTHANDOFF)) {
                          sctp_path_check_and_react(stcb, addr);
                          return;
                  }
                  /* clear any cached/topologically incorrect source addresses */
                  sctp_asconf_nets_cleanup(stcb, addr->ifn_p);
          }
          /* else, leave it on the list */
  }
  
  /*
   * add an asconf add/delete/set primary IP address parameter to the queue.
   * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR.
   * returns 0 if queued, -1 if not queued/removed.
   * NOTE: if adding, but a delete for the same address is already scheduled
   * (and not yet sent out), simply remove it from queue.  Same for deleting
   * an address already scheduled for add.  If a duplicate operation is found,
   * ignore the new one.
   */
  static int
  sctp_asconf_queue_mgmt(struct sctp_tcb *stcb, struct sctp_ifa *ifa,
      uint16_t type)
  {
          struct sctp_asconf_addr *aa, *aa_next;
  
          /* make sure the request isn't already in the queue */
          TAILQ_FOREACH_SAFE(aa, &stcb->asoc.asconf_queue, next, aa_next) {
                  /* address match? */
                  if (sctp_asconf_addr_match(aa, &ifa->address.sa) == 0)
                          continue;
                  /*
                   * is the request already in queue but not sent? pass the
                   * request already sent in order to resolve the following
                   * case: 1. arrival of ADD, then sent 2. arrival of DEL. we
                   * can't remove the ADD request already sent 3. arrival of
                   * ADD
                   */
                  if (aa->ap.aph.ph.param_type == type && aa->sent == 0) {
                          return (-1);
                  }
                  /* is the negative request already in queue, and not sent */
                  if ((aa->sent == 0) && (type == SCTP_ADD_IP_ADDRESS) &&
                      (aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS)) {
                          /* add requested, delete already queued */
                          TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
                          /* remove the ifa from the restricted list */
                          sctp_del_local_addr_restricted(stcb, ifa);
                          /* free the asconf param */
                          SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                          SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_mgmt: add removes queued entry\n");
                          return (-1);
                  }
                  if ((aa->sent == 0) && (type == SCTP_DEL_IP_ADDRESS) &&
                      (aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS)) {
                          /* delete requested, add already queued */
                          TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
                          /* remove the aa->ifa from the restricted list */
                          sctp_del_local_addr_restricted(stcb, aa->ifa);
                          /* free the asconf param */
                          SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                          SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_mgmt: delete removes queued entry\n");
                          return (-1);
                  }
          }                       /* for each aa */
  
          /* adding new request to the queue */
          SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
              SCTP_M_ASC_ADDR);
          if (aa == NULL) {
                  /* didn't get memory */
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "asconf_queue_mgmt: failed to get memory!\n");
                  return (-1);
          }
          aa->special_del = 0;
          /* fill in asconf address parameter fields */
          /* top level elements are "networked" during send */
          aa->ap.aph.ph.param_type = type;
          aa->ifa = ifa;
          atomic_add_int(&ifa->refcount, 1);
          /* correlation_id filled in during send routine later... */
          switch (ifa->address.sa.sa_family) {
  #ifdef INET6
          case AF_INET6:
                  {
                          struct sockaddr_in6 *sin6;
  
                          sin6 = &ifa->address.sin6;
                          aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
                          aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param));
                          aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) +
                              sizeof(struct sctp_ipv6addr_param);
                          memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr,
                              sizeof(struct in6_addr));
                          break;
                  }
  #endif
  #ifdef INET
          case AF_INET:
                  {
                          struct sockaddr_in *sin;
  
                          sin = &ifa->address.sin;
                          aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
                          aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param));
                          aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) +
                              sizeof(struct sctp_ipv4addr_param);
                          memcpy(&aa->ap.addrp.addr, &sin->sin_addr,
                              sizeof(struct in_addr));
                          break;
                  }
  #endif
          default:
                  /* invalid family! */
                  SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                  sctp_free_ifa(ifa);
                  return (-1);
          }
          aa->sent = 0;           /* clear sent flag */
  
          TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
  #ifdef SCTP_DEBUG
          if (SCTP_BASE_SYSCTL(sctp_debug_on) & SCTP_DEBUG_ASCONF2) {
                  if (type == SCTP_ADD_IP_ADDRESS) {
                          SCTP_PRINTF("asconf_queue_mgmt: inserted asconf ADD_IP_ADDRESS: ");
                          SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, &ifa->address.sa);
                  } else if (type == SCTP_DEL_IP_ADDRESS) {
                          SCTP_PRINTF("asconf_queue_mgmt: appended asconf DEL_IP_ADDRESS: ");
                          SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, &ifa->address.sa);
                  } else {
                          SCTP_PRINTF("asconf_queue_mgmt: appended asconf SET_PRIM_ADDR: ");
                          SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, &ifa->address.sa);
                  }
          }
  #endif
  
          return (0);
  }
  
  /*
   * add an asconf operation for the given ifa and type.
   * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR.
   * returns 0 if completed, -1 if not completed, 1 if immediate send is
   * advisable.
   */
  static int
  sctp_asconf_queue_add(struct sctp_tcb *stcb, struct sctp_ifa *ifa,
      uint16_t type)
  {
          uint32_t status;
          int pending_delete_queued = 0;
          int last;
  
          /* see if peer supports ASCONF */
          if (stcb->asoc.asconf_supported == 0) {
                  return (-1);
          }
  
          /*
           * if this is deleting the last address from the assoc, mark it as
           * pending.
           */
          if ((type == SCTP_DEL_IP_ADDRESS) && !stcb->asoc.asconf_del_pending) {
                  if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                          last = (sctp_local_addr_count(stcb) == 0);
                  } else {
                          last = (sctp_local_addr_count(stcb) == 1);
                  }
                  if (last) {
                          /* set the pending delete info only */
                          stcb->asoc.asconf_del_pending = 1;
                          stcb->asoc.asconf_addr_del_pending = ifa;
                          atomic_add_int(&ifa->refcount, 1);
                          SCTPDBG(SCTP_DEBUG_ASCONF2,
                              "asconf_queue_add: mark delete last address pending\n");
                          return (-1);
                  }
          }
  
          /* queue an asconf parameter */
          status = sctp_asconf_queue_mgmt(stcb, ifa, type);
  
          /*
           * if this is an add, and there is a delete also pending (i.e. the
           * last local address is being changed), queue the pending delete
           * too.
           */
          if ((type == SCTP_ADD_IP_ADDRESS) && stcb->asoc.asconf_del_pending && (status == 0)) {
                  /* queue in the pending delete */
                  if (sctp_asconf_queue_mgmt(stcb,
                      stcb->asoc.asconf_addr_del_pending,
                      SCTP_DEL_IP_ADDRESS) == 0) {
                          SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_add: queuing pending delete\n");
                          pending_delete_queued = 1;
                          /* clear out the pending delete info */
                          stcb->asoc.asconf_del_pending = 0;
                          sctp_free_ifa(stcb->asoc.asconf_addr_del_pending);
                          stcb->asoc.asconf_addr_del_pending = NULL;
                  }
          }
  
          if (pending_delete_queued) {
                  struct sctp_nets *net;
  
                  /*
                   * since we know that the only/last address is now being
                   * changed in this case, reset the cwnd/rto on all nets to
                   * start as a new address and path.  Also clear the error
                   * counts to give the assoc the best chance to complete the
                   * address change.
                   */
                  TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                          stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb,
                              net);
                          net->RTO = 0;
                          net->error_count = 0;
                  }
                  stcb->asoc.overall_error_count = 0;
                  if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
                          sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
                              stcb->asoc.overall_error_count,
                              0,
                              SCTP_FROM_SCTP_ASCONF,
                              __LINE__);
                  }
  
                  /* queue in an advisory set primary too */
                  (void)sctp_asconf_queue_mgmt(stcb, ifa, SCTP_SET_PRIM_ADDR);
                  /* let caller know we should send this out immediately */
                  status = 1;
          }
          return (status);
  }
  
  /*-
   * add an asconf delete IP address parameter to the queue by sockaddr and
   * possibly with no sctp_ifa available.  This is only called by the routine
   * that checks the addresses in an INIT-ACK against the current address list.
   * returns 0 if completed, non-zero if not completed.
   * NOTE: if an add is already scheduled (and not yet sent out), simply
   * remove it from queue.  If a duplicate operation is found, ignore the
   * new one.
   */
  static int
  sctp_asconf_queue_sa_delete(struct sctp_tcb *stcb, struct sockaddr *sa)
  {
          struct sctp_ifa *ifa;
          struct sctp_asconf_addr *aa, *aa_next;
  
          if (stcb == NULL) {
                  return (-1);
          }
          /* see if peer supports ASCONF */
          if (stcb->asoc.asconf_supported == 0) {
                  return (-1);
          }
          /* make sure the request isn't already in the queue */
          TAILQ_FOREACH_SAFE(aa, &stcb->asoc.asconf_queue, next, aa_next) {
                  /* address match? */
                  if (sctp_asconf_addr_match(aa, sa) == 0)
                          continue;
                  /* is the request already in queue (sent or not) */
                  if (aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) {
                          return (-1);
                  }
                  /* is the negative request already in queue, and not sent */
                  if (aa->sent == 1)
                          continue;
                  if (aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS) {
                          /* add already queued, so remove existing entry */
                          TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
                          sctp_del_local_addr_restricted(stcb, aa->ifa);
                          /* free the entry */
                          SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                          return (-1);
                  }
          }                       /* for each aa */
  
          /* find any existing ifa-- NOTE ifa CAN be allowed to be NULL */
          ifa = sctp_find_ifa_by_addr(sa, stcb->asoc.vrf_id, SCTP_ADDR_NOT_LOCKED);
  
          /* adding new request to the queue */
          SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
              SCTP_M_ASC_ADDR);
          if (aa == NULL) {
                  /* didn't get memory */
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "sctp_asconf_queue_sa_delete: failed to get memory!\n");
                  return (-1);
          }
          aa->special_del = 0;
          /* fill in asconf address parameter fields */
          /* top level elements are "networked" during send */
          aa->ap.aph.ph.param_type = SCTP_DEL_IP_ADDRESS;
          aa->ifa = ifa;
          if (ifa)
                  atomic_add_int(&ifa->refcount, 1);
          /* correlation_id filled in during send routine later... */
          switch (sa->sa_family) {
  #ifdef INET6
          case AF_INET6:
                  {
                          /* IPv6 address */
                          struct sockaddr_in6 *sin6;
  
                          sin6 = (struct sockaddr_in6 *)sa;
                          aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
                          aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param));
                          aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv6addr_param);
                          memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr,
                              sizeof(struct in6_addr));
                          break;
                  }
  #endif
  #ifdef INET
          case AF_INET:
                  {
                          /* IPv4 address */
                          struct sockaddr_in *sin = (struct sockaddr_in *)sa;
  
                          aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
                          aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param));
                          aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv4addr_param);
                          memcpy(&aa->ap.addrp.addr, &sin->sin_addr,
                              sizeof(struct in_addr));
                          break;
                  }
  #endif
          default:
                  /* invalid family! */
                  SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                  if (ifa)
                          sctp_free_ifa(ifa);
                  return (-1);
          }
          aa->sent = 0;           /* clear sent flag */
  
          /* delete goes to the back of the queue */
          TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
  
          /* sa_ignore MEMLEAK {memory is put on the tailq} */
          return (0);
  }
  
  /*
   * find a specific asconf param on our "sent" queue
   */
  static struct sctp_asconf_addr *
  sctp_asconf_find_param(struct sctp_tcb *stcb, uint32_t correlation_id)
  {
          struct sctp_asconf_addr *aa;
  
          TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
                  if (aa->ap.aph.correlation_id == correlation_id &&
                      aa->sent == 1) {
                          /* found it */
                          return (aa);
                  }
          }
          /* didn't find it */
          return (NULL);
  }
  
  /*
   * process an SCTP_ERROR_CAUSE_IND for a ASCONF-ACK parameter and do
   * notifications based on the error response
   */
  static void
  sctp_asconf_process_error(struct sctp_tcb *stcb SCTP_UNUSED,
      struct sctp_asconf_paramhdr *aph)
  {
          struct sctp_error_cause *eh;
          struct sctp_paramhdr *ph;
          uint16_t param_type;
          uint16_t error_code;
  
          eh = (struct sctp_error_cause *)(aph + 1);
          ph = (struct sctp_paramhdr *)(eh + 1);
          /* validate lengths */
          if (htons(eh->length) + sizeof(struct sctp_error_cause) >
              htons(aph->ph.param_length)) {
                  /* invalid error cause length */
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "asconf_process_error: cause element too long\n");
                  return;
          }
          if (htons(ph->param_length) + sizeof(struct sctp_paramhdr) >
              htons(eh->length)) {
                  /* invalid included TLV length */
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "asconf_process_error: included TLV too long\n");
                  return;
          }
          /* which error code ? */
          error_code = ntohs(eh->code);
          param_type = ntohs(aph->ph.param_type);
          /* FIX: this should go back up the REMOTE_ERROR ULP notify */
          switch (error_code) {
          case SCTP_CAUSE_RESOURCE_SHORTAGE:
                  /* we allow ourselves to "try again" for this error */
                  break;
          default:
                  /* peer can't handle it... */
                  switch (param_type) {
                  case SCTP_ADD_IP_ADDRESS:
                  case SCTP_DEL_IP_ADDRESS:
                  case SCTP_SET_PRIM_ADDR:
                          break;
                  default:
                          break;
                  }
          }
  }
  
  /*
   * process an asconf queue param.
   * aparam: parameter to process, will be removed from the queue.
   * flag: 1=success case, 0=failure case
   */
  static void
  sctp_asconf_process_param_ack(struct sctp_tcb *stcb,
      struct sctp_asconf_addr *aparam, uint32_t flag)
  {
          uint16_t param_type;
  
          /* process this param */
          param_type = aparam->ap.aph.ph.param_type;
          switch (param_type) {
          case SCTP_ADD_IP_ADDRESS:
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "process_param_ack: added IP address\n");
                  sctp_asconf_addr_mgmt_ack(stcb, aparam->ifa, flag);
                  break;
          case SCTP_DEL_IP_ADDRESS:
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "process_param_ack: deleted IP address\n");
                  /* nothing really to do... lists already updated */
                  break;
          case SCTP_SET_PRIM_ADDR:
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "process_param_ack: set primary IP address\n");
                  /* nothing to do... peer may start using this addr */
                  break;
          default:
                  /* should NEVER happen */
                  break;
          }
  
          /* remove the param and free it */
          TAILQ_REMOVE(&stcb->asoc.asconf_queue, aparam, next);
          if (aparam->ifa)
                  sctp_free_ifa(aparam->ifa);
          SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
  }
  
  /*
   * cleanup from a bad asconf ack parameter
   */
  static void
  sctp_asconf_ack_clear(struct sctp_tcb *stcb SCTP_UNUSED)
  {
          /* assume peer doesn't really know how to do asconfs */
          /* XXX we could free the pending queue here */
  
  }
  
  void
  sctp_handle_asconf_ack(struct mbuf *m, int offset,
      struct sctp_asconf_ack_chunk *cp, struct sctp_tcb *stcb,
      struct sctp_nets *net, int *abort_no_unlock)
  {
          struct sctp_association *asoc;
          uint32_t serial_num;
          uint16_t ack_length;
          struct sctp_asconf_paramhdr *aph;
          struct sctp_asconf_addr *aa, *aa_next;
          uint32_t last_error_id = 0;     /* last error correlation id */
          uint32_t id;
          struct sctp_asconf_addr *ap;
  
          /* asconf param buffer */
          uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
  
          /* verify minimum length */
          if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_ack_chunk)) {
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "handle_asconf_ack: chunk too small = %xh\n",
                      ntohs(cp->ch.chunk_length));
                  return;
          }
          asoc = &stcb->asoc;
          serial_num = ntohl(cp->serial_number);
  
          /*
           * NOTE: we may want to handle this differently- currently, we will
           * abort when we get an ack for the expected serial number + 1 (eg.
           * we didn't send it), process an ack normally if it is the expected
           * serial number, and re-send the previous ack for *ALL* other
           * serial numbers
           */
  
          /*
           * if the serial number is the next expected, but I didn't send it,
           * abort the asoc, since someone probably just hijacked us...
           */
          if (serial_num == (asoc->asconf_seq_out + 1)) {
                  struct mbuf *op_err;
                  char msg[SCTP_DIAG_INFO_LEN];
  
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf_ack: got unexpected next serial number! Aborting asoc!\n");
                  SCTP_SNPRINTF(msg, sizeof(msg), "Never sent serial number %8.8x", serial_num);
                  op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
                  sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
                  *abort_no_unlock = 1;
                  return;
          }
          if (serial_num != asoc->asconf_seq_out_acked + 1) {
                  /* got a duplicate/unexpected ASCONF-ACK */
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf_ack: got duplicate/unexpected serial number = %xh (expected = %xh)\n",
                      serial_num, asoc->asconf_seq_out_acked + 1);
                  return;
          }
  
          if (serial_num == asoc->asconf_seq_out - 1) {
                  /* stop our timer */
                  sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, NULL,
                      SCTP_FROM_SCTP_ASCONF + SCTP_LOC_5);
          }
  
          /* process the ASCONF-ACK contents */
          ack_length = ntohs(cp->ch.chunk_length) -
              sizeof(struct sctp_asconf_ack_chunk);
          offset += sizeof(struct sctp_asconf_ack_chunk);
          /* process through all parameters */
          while (ack_length >= sizeof(struct sctp_asconf_paramhdr)) {
                  unsigned int param_length, param_type;
  
                  /* get pointer to next asconf parameter */
                  aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset,
                      sizeof(struct sctp_asconf_paramhdr), aparam_buf);
                  if (aph == NULL) {
                          /* can't get an asconf paramhdr */
                          sctp_asconf_ack_clear(stcb);
                          return;
                  }
                  param_type = ntohs(aph->ph.param_type);
                  param_length = ntohs(aph->ph.param_length);
                  if (param_length > ack_length) {
                          sctp_asconf_ack_clear(stcb);
                          return;
                  }
                  if (param_length < sizeof(struct sctp_asconf_paramhdr)) {
                          sctp_asconf_ack_clear(stcb);
                          return;
                  }
                  /* get the complete parameter... */
                  if (param_length > sizeof(aparam_buf)) {
                          SCTPDBG(SCTP_DEBUG_ASCONF1,
                              "param length (%u) larger than buffer size!\n", param_length);
                          sctp_asconf_ack_clear(stcb);
                          return;
                  }
                  aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf);
                  if (aph == NULL) {
                          sctp_asconf_ack_clear(stcb);
                          return;
                  }
                  /* correlation_id is transparent to peer, no ntohl needed */
                  id = aph->correlation_id;
  
                  switch (param_type) {
                  case SCTP_ERROR_CAUSE_IND:
                          last_error_id = id;
                          /* find the corresponding asconf param in our queue */
                          ap = sctp_asconf_find_param(stcb, id);
                          if (ap == NULL) {
                                  /* hmm... can't find this in our queue! */
                                  break;
                          }
                          /* process the parameter, failed flag */
                          sctp_asconf_process_param_ack(stcb, ap, 0);
                          /* process the error response */
                          sctp_asconf_process_error(stcb, aph);
                          break;
                  case SCTP_SUCCESS_REPORT:
                          /* find the corresponding asconf param in our queue */
                          ap = sctp_asconf_find_param(stcb, id);
                          if (ap == NULL) {
                                  /* hmm... can't find this in our queue! */
                                  break;
                          }
                          /* process the parameter, success flag */
                          sctp_asconf_process_param_ack(stcb, ap, 1);
                          break;
                  default:
                          break;
                  }               /* switch */
  
                  /* update remaining ASCONF-ACK message length to process */
                  if (ack_length > SCTP_SIZE32(param_length)) {
                          ack_length -= SCTP_SIZE32(param_length);
                  } else {
                          break;
                  }
                  offset += SCTP_SIZE32(param_length);
          }                       /* while */
  
          /*
           * if there are any "sent" params still on the queue, these are
           * implicitly "success", or "failed" (if we got an error back) ...
           * so process these appropriately
           *
           * we assume that the correlation_id's are monotonically increasing
           * beginning from 1 and that we don't have *that* many outstanding
           * at any given time
           */
          if (last_error_id == 0)
                  last_error_id--;        /* set to "max" value */
          TAILQ_FOREACH_SAFE(aa, &stcb->asoc.asconf_queue, next, aa_next) {
                  if (aa->sent == 1) {
                          /*
                           * implicitly successful or failed if correlation_id
                           * < last_error_id, then success else, failure
                           */
                          if (aa->ap.aph.correlation_id < last_error_id)
                                  sctp_asconf_process_param_ack(stcb, aa, 1);
                          else
                                  sctp_asconf_process_param_ack(stcb, aa, 0);
                  } else {
                          /*
                           * since we always process in order (FIFO queue) if
                           * we reach one that hasn't been sent, the rest
                           * should not have been sent either. so, we're
                           * done...
                           */
                          break;
                  }
          }
  
          /* update the next sequence number to use */
          asoc->asconf_seq_out_acked++;
          /* remove the old ASCONF on our outbound queue */
          sctp_toss_old_asconf(stcb);
          if (!TAILQ_EMPTY(&stcb->asoc.asconf_queue)) {
  #ifdef SCTP_TIMER_BASED_ASCONF
                  /* we have more params, so restart our timer */
                  sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep,
                      stcb, net);
  #else
                  /* we have more params, so send out more */
                  sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
  #endif
          }
  }
  
  #ifdef INET6
  static uint32_t
  sctp_is_scopeid_in_nets(struct sctp_tcb *stcb, struct sockaddr *sa)
  {
          struct sockaddr_in6 *sin6, *net6;
          struct sctp_nets *net;
  
          if (sa->sa_family != AF_INET6) {
                  /* wrong family */
                  return (0);
          }
          sin6 = (struct sockaddr_in6 *)sa;
          if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) == 0) {
                  /* not link local address */
                  return (0);
          }
          /* hunt through our destination nets list for this scope_id */
          TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                  if (((struct sockaddr *)(&net->ro._l_addr))->sa_family !=
                      AF_INET6)
                          continue;
                  net6 = (struct sockaddr_in6 *)&net->ro._l_addr;
                  if (IN6_IS_ADDR_LINKLOCAL(&net6->sin6_addr) == 0)
                          continue;
                  if (sctp_is_same_scope(sin6, net6)) {
                          /* found one */
                          return (1);
                  }
          }
          /* didn't find one */
          return (0);
  }
  #endif
  
  /*
   * address management functions
   */
  static void
  sctp_addr_mgmt_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
      struct sctp_ifa *ifa, uint16_t type, int addr_locked)
  {
          int status;
  
          if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0 ||
              sctp_is_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
                  /* subset bound, no ASCONF allowed case, so ignore */
                  return;
          }
          /*
           * note: we know this is not the subset bound, no ASCONF case eg.
           * this is boundall or subset bound w/ASCONF allowed
           */
  
          /* first, make sure that the address is IPv4 or IPv6 and not jailed */
          switch (ifa->address.sa.sa_family) {
  #ifdef INET6
          case AF_INET6:
                  if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
                      &ifa->address.sin6.sin6_addr) != 0) {
                          return;
                  }
                  break;
  #endif
  #ifdef INET
          case AF_INET:
                  if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
                      &ifa->address.sin.sin_addr) != 0) {
                          return;
                  }
                  break;
  #endif
          default:
                  return;
          }
  #ifdef INET6
          /* make sure we're "allowed" to add this type of addr */
          if (ifa->address.sa.sa_family == AF_INET6) {
                  /* invalid if we're not a v6 endpoint */
                  if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0)
                          return;
                  /* is the v6 addr really valid ? */
                  if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                          return;
                  }
          }
  #endif
          /* put this address on the "pending/do not use yet" list */
          sctp_add_local_addr_restricted(stcb, ifa);
          /*
           * check address scope if address is out of scope, don't queue
           * anything... note: this would leave the address on both inp and
           * asoc lists
           */
          switch (ifa->address.sa.sa_family) {
  #ifdef INET6
          case AF_INET6:
                  {
                          struct sockaddr_in6 *sin6;
  
                          sin6 = &ifa->address.sin6;
                          if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                                  /* we skip unspecified addresses */
                                  return;
                          }
                          if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                                  if (stcb->asoc.scope.local_scope == 0) {
                                          return;
                                  }
                                  /* is it the right link local scope? */
                                  if (sctp_is_scopeid_in_nets(stcb, &ifa->address.sa) == 0) {
                                          return;
                                  }
                          }
                          if (stcb->asoc.scope.site_scope == 0 &&
                              IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
                                  return;
                          }
                          break;
                  }
  #endif
  #ifdef INET
          case AF_INET:
                  {
                          struct sockaddr_in *sin;
  
                          /* invalid if we are a v6 only endpoint */
                          if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                              SCTP_IPV6_V6ONLY(inp))
                                  return;
  
                          sin = &ifa->address.sin;
                          if (sin->sin_addr.s_addr == 0) {
                                  /* we skip unspecified addresses */
                                  return;
                          }
                          if (stcb->asoc.scope.ipv4_local_scope == 0 &&
                              IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
                                  return;
                          }
                          break;
                  }
  #endif
          default:
                  /* else, not AF_INET or AF_INET6, so skip */
                  return;
          }
  
          /* queue an asconf for this address add/delete */
          if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
                  /* does the peer do asconf? */
                  if (stcb->asoc.asconf_supported) {
                          /* queue an asconf for this addr */
                          status = sctp_asconf_queue_add(stcb, ifa, type);
  
                          /*
                           * if queued ok, and in the open state, send out the
                           * ASCONF.  If in the non-open state, these will be
                           * sent when the state goes open.
                           */
                          if (status == 0 &&
                              ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
                              (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED))) {
  #ifdef SCTP_TIMER_BASED_ASCONF
                                  sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
                                      stcb, stcb->asoc.primary_destination);
  #else
                                  sctp_send_asconf(stcb, NULL, addr_locked);
  #endif
                          }
                  }
          }
  }
  
  int
  sctp_asconf_iterator_ep(struct sctp_inpcb *inp, void *ptr, uint32_t val SCTP_UNUSED)
  {
          struct sctp_asconf_iterator *asc;
          struct sctp_ifa *ifa;
          struct sctp_laddr *l;
          int cnt_invalid = 0;
  
          asc = (struct sctp_asconf_iterator *)ptr;
          LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
                  ifa = l->ifa;
                  switch (ifa->address.sa.sa_family) {
  #ifdef INET6
                  case AF_INET6:
                          /* invalid if we're not a v6 endpoint */
                          if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
                                  cnt_invalid++;
                                  if (asc->cnt == cnt_invalid)
                                          return (1);
                          }
                          break;
  #endif
  #ifdef INET
                  case AF_INET:
                          {
                                  /* invalid if we are a v6 only endpoint */
                                  if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                                      SCTP_IPV6_V6ONLY(inp)) {
                                          cnt_invalid++;
                                          if (asc->cnt == cnt_invalid)
                                                  return (1);
                                  }
                                  break;
                          }
  #endif
                  default:
                          /* invalid address family */
                          cnt_invalid++;
                          if (asc->cnt == cnt_invalid)
                                  return (1);
                  }
          }
          return (0);
  }
  
  static int
  sctp_asconf_iterator_ep_end(struct sctp_inpcb *inp, void *ptr, uint32_t val SCTP_UNUSED)
  {
          struct sctp_ifa *ifa;
          struct sctp_asconf_iterator *asc;
          struct sctp_laddr *laddr, *nladdr, *l;
  
          /* Only for specific case not bound all */
          asc = (struct sctp_asconf_iterator *)ptr;
          LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
                  ifa = l->ifa;
                  if (l->action == SCTP_ADD_IP_ADDRESS) {
                          LIST_FOREACH(laddr, &inp->sctp_addr_list,
                              sctp_nxt_addr) {
                                  if (laddr->ifa == ifa) {
                                          laddr->action = 0;
                                          break;
                                  }
                          }
                  } else if (l->action == SCTP_DEL_IP_ADDRESS) {
                          LIST_FOREACH_SAFE(laddr, &inp->sctp_addr_list, sctp_nxt_addr, nladdr) {
                                  /* remove only after all guys are done */
                                  if (laddr->ifa == ifa) {
                                          sctp_del_local_addr_ep(inp, ifa);
                                  }
                          }
                  }
          }
          return (0);
  }
  
  void
  sctp_asconf_iterator_stcb(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
      void *ptr, uint32_t val SCTP_UNUSED)
  {
          struct sctp_asconf_iterator *asc;
          struct sctp_ifa *ifa;
          struct sctp_laddr *l;
          int cnt_invalid = 0;
          int type, status;
          int num_queued = 0;
  
          asc = (struct sctp_asconf_iterator *)ptr;
          LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
                  ifa = l->ifa;
                  type = l->action;
  
                  /* address's vrf_id must be the vrf_id of the assoc */
                  if (ifa->vrf_id != stcb->asoc.vrf_id) {
                          continue;
                  }
  
                  /* Same checks again for assoc */
                  switch (ifa->address.sa.sa_family) {
  #ifdef INET6
                  case AF_INET6:
                          {
                                  /* invalid if we're not a v6 endpoint */
                                  struct sockaddr_in6 *sin6;
  
                                  if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
                                          cnt_invalid++;
                                          if (asc->cnt == cnt_invalid)
                                                  return;
                                          else
                                                  continue;
                                  }
                                  sin6 = &ifa->address.sin6;
                                  if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                                          /* we skip unspecified addresses */
                                          continue;
                                  }
                                  if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
                                      &sin6->sin6_addr) != 0) {
                                          continue;
                                  }
                                  if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                                          if (stcb->asoc.scope.local_scope == 0) {
                                                  continue;
                                          }
                                          /* is it the right link local scope? */
                                          if (sctp_is_scopeid_in_nets(stcb, &ifa->address.sa) == 0) {
                                                  continue;
                                          }
                                  }
                                  break;
                          }
  #endif
  #ifdef INET
                  case AF_INET:
                          {
                                  /* invalid if we are a v6 only endpoint */
                                  struct sockaddr_in *sin;
  
                                  /* invalid if we are a v6 only endpoint */
                                  if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                                      SCTP_IPV6_V6ONLY(inp))
                                          continue;
  
                                  sin = &ifa->address.sin;
                                  if (sin->sin_addr.s_addr == 0) {
                                          /* we skip unspecified addresses */
                                          continue;
                                  }
                                  if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
                                      &sin->sin_addr) != 0) {
                                          continue;
                                  }
                                  if (stcb->asoc.scope.ipv4_local_scope == 0 &&
                                      IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
                                          continue;
                                  }
                                  if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                                      SCTP_IPV6_V6ONLY(inp)) {
                                          cnt_invalid++;
                                          if (asc->cnt == cnt_invalid)
                                                  return;
                                          else
                                                  continue;
                                  }
                                  break;
                          }
  #endif
                  default:
                          /* invalid address family */
                          cnt_invalid++;
                          if (asc->cnt == cnt_invalid)
                                  return;
                          else
                                  continue;
                  }
  
                  if (type == SCTP_ADD_IP_ADDRESS) {
                          /* prevent this address from being used as a source */
                          sctp_add_local_addr_restricted(stcb, ifa);
                  } else if (type == SCTP_DEL_IP_ADDRESS) {
                          struct sctp_nets *net;
  
                          TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                                  /* delete this address if cached */
                                  if (net->ro._s_addr == ifa) {
                                          sctp_free_ifa(net->ro._s_addr);
                                          net->ro._s_addr = NULL;
                                          net->src_addr_selected = 0;
                                          RO_NHFREE(&net->ro);
                                          /*
                                           * Now we deleted our src address,
                                           * should we not also now reset the
                                           * cwnd/rto to start as if its a new
                                           * address?
                                           */
                                          stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb, net);
                                          net->RTO = 0;
                                  }
                          }
                  } else if (type == SCTP_SET_PRIM_ADDR) {
                          if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
                                  /* must validate the ifa is in the ep */
                                  if (sctp_is_addr_in_ep(stcb->sctp_ep, ifa) == 0) {
                                          continue;
                                  }
                          } else {
                                  /* Need to check scopes for this guy */
                                  if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
                                          continue;
                                  }
                          }
                  }
                  /* queue an asconf for this address add/delete */
                  if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF) &&
                      stcb->asoc.asconf_supported == 1) {
                          /* queue an asconf for this addr */
                          status = sctp_asconf_queue_add(stcb, ifa, type);
                          /*
                           * if queued ok, and in the open state, update the
                           * count of queued params.  If in the non-open
                           * state, these get sent when the assoc goes open.
                           */
                          if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
                              (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
                                  if (status >= 0) {
                                          num_queued++;
                                  }
                          }
                  }
          }
          /*
           * If we have queued params in the open state, send out an ASCONF.
           */
          if (num_queued > 0) {
                  sctp_send_asconf(stcb, NULL, SCTP_ADDR_NOT_LOCKED);
          }
  }
  
  void
  sctp_asconf_iterator_end(void *ptr, uint32_t val SCTP_UNUSED)
  {
          struct sctp_asconf_iterator *asc;
          struct sctp_ifa *ifa;
          struct sctp_laddr *l, *nl;
  
          asc = (struct sctp_asconf_iterator *)ptr;
          LIST_FOREACH_SAFE(l, &asc->list_of_work, sctp_nxt_addr, nl) {
                  ifa = l->ifa;
                  if (l->action == SCTP_ADD_IP_ADDRESS) {
                          /* Clear the defer use flag */
                          ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
                  }
                  sctp_free_ifa(ifa);
                  SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_laddr), l);
                  SCTP_DECR_LADDR_COUNT();
          }
          SCTP_FREE(asc, SCTP_M_ASC_IT);
  }
  
  /*
   * sa is the sockaddr to ask the peer to set primary to.
   * returns: 0 = completed, -1 = error
   */
  int32_t
  sctp_set_primary_ip_address_sa(struct sctp_tcb *stcb, struct sockaddr *sa)
  {
          uint32_t vrf_id;
          struct sctp_ifa *ifa;
  
          /* find the ifa for the desired set primary */
          vrf_id = stcb->asoc.vrf_id;
          ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
          if (ifa == NULL) {
                  /* Invalid address */
                  return (-1);
          }
  
          /* queue an ASCONF:SET_PRIM_ADDR to be sent */
          if (!sctp_asconf_queue_add(stcb, ifa, SCTP_SET_PRIM_ADDR)) {
                  /* set primary queuing succeeded */
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "set_primary_ip_address_sa: queued on tcb=%p, ",
                      (void *)stcb);
                  SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                  if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
                      (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  #ifdef SCTP_TIMER_BASED_ASCONF
                          sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
                              stcb->sctp_ep, stcb,
                              stcb->asoc.primary_destination);
  #else
                          sctp_send_asconf(stcb, NULL, SCTP_ADDR_NOT_LOCKED);
  #endif
                  }
          } else {
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "set_primary_ip_address_sa: failed to add to queue on tcb=%p, ",
                      (void *)stcb);
                  SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                  return (-1);
          }
          return (0);
  }
  
  int
  sctp_is_addr_pending(struct sctp_tcb *stcb, struct sctp_ifa *sctp_ifa)
  {
          struct sctp_tmit_chunk *chk, *nchk;
          unsigned int offset, asconf_limit;
          struct sctp_asconf_chunk *acp;
          struct sctp_asconf_paramhdr *aph;
          uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
          struct sctp_paramhdr *ph;
          int add_cnt, del_cnt;
          uint16_t last_param_type;
  
          add_cnt = del_cnt = 0;
          last_param_type = 0;
          TAILQ_FOREACH_SAFE(chk, &stcb->asoc.asconf_send_queue, sctp_next, nchk) {
                  if (chk->data == NULL) {
                          SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: No mbuf data?\n");
                          continue;
                  }
                  offset = 0;
                  acp = mtod(chk->data, struct sctp_asconf_chunk *);
                  offset += sizeof(struct sctp_asconf_chunk);
                  asconf_limit = ntohs(acp->ch.chunk_length);
                  ph = (struct sctp_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_paramhdr), aparam_buf);
                  if (ph == NULL) {
                          SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: couldn't get lookup addr!\n");
                          continue;
                  }
                  offset += ntohs(ph->param_length);
  
                  aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf);
                  if (aph == NULL) {
                          SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: Empty ASCONF will be sent?\n");
                          continue;
                  }
                  while (aph != NULL) {
                          unsigned int param_length, param_type;
  
                          param_type = ntohs(aph->ph.param_type);
                          param_length = ntohs(aph->ph.param_length);
                          if (offset + param_length > asconf_limit) {
                                  /* parameter goes beyond end of chunk! */
                                  break;
                          }
                          if (param_length > sizeof(aparam_buf)) {
                                  SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: param length (%u) larger than buffer size!\n", param_length);
                                  break;
                          }
                          if (param_length <= sizeof(struct sctp_paramhdr)) {
                                  SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: param length(%u) too short\n", param_length);
                                  break;
                          }
  
                          aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, param_length, aparam_buf);
                          if (aph == NULL) {
                                  SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: couldn't get entire param\n");
                                  break;
                          }
  
                          ph = (struct sctp_paramhdr *)(aph + 1);
                          if (sctp_addr_match(ph, &sctp_ifa->address.sa) != 0) {
                                  switch (param_type) {
                                  case SCTP_ADD_IP_ADDRESS:
                                          add_cnt++;
                                          break;
                                  case SCTP_DEL_IP_ADDRESS:
                                          del_cnt++;
                                          break;
                                  default:
                                          break;
                                  }
                                  last_param_type = param_type;
                          }
  
                          offset += SCTP_SIZE32(param_length);
                          if (offset >= asconf_limit) {
                                  /* no more data in the mbuf chain */
                                  break;
                          }
                          /* get pointer to next asconf param */
                          aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf);
                  }
          }
  
          /*
           * we want to find the sequences which consist of ADD -> DEL -> ADD
           * or DEL -> ADD
           */
          if (add_cnt > del_cnt ||
              (add_cnt == del_cnt && last_param_type == SCTP_ADD_IP_ADDRESS)) {
                  return (1);
          }
          return (0);
  }
  
  static struct sockaddr *
  sctp_find_valid_localaddr(struct sctp_tcb *stcb, int addr_locked)
  {
          struct sctp_vrf *vrf = NULL;
          struct sctp_ifn *sctp_ifn;
          struct sctp_ifa *sctp_ifa;
  
          if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                  SCTP_IPI_ADDR_RLOCK();
          vrf = sctp_find_vrf(stcb->asoc.vrf_id);
          if (vrf == NULL) {
                  if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                          SCTP_IPI_ADDR_RUNLOCK();
                  return (NULL);
          }
          LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
                  if (stcb->asoc.scope.loopback_scope == 0 &&
                      SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
                          /* Skip if loopback_scope not set */
                          continue;
                  }
                  LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                          switch (sctp_ifa->address.sa.sa_family) {
  #ifdef INET
                          case AF_INET:
                                  if (stcb->asoc.scope.ipv4_addr_legal) {
                                          struct sockaddr_in *sin;
  
                                          sin = &sctp_ifa->address.sin;
                                          if (sin->sin_addr.s_addr == 0) {
                                                  /*
                                                   * skip unspecified
                                                   * addresses
                                                   */
                                                  continue;
                                          }
                                          if (prison_check_ip4(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                              &sin->sin_addr) != 0) {
                                                  continue;
                                          }
                                          if (stcb->asoc.scope.ipv4_local_scope == 0 &&
                                              IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))
                                                  continue;
  
                                          if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
                                              (!sctp_is_addr_pending(stcb, sctp_ifa)))
                                                  continue;
                                          /*
                                           * found a valid local v4 address to
                                           * use
                                           */
                                          if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                                                  SCTP_IPI_ADDR_RUNLOCK();
                                          return (&sctp_ifa->address.sa);
                                  }
                                  break;
  #endif
  #ifdef INET6
                          case AF_INET6:
                                  if (stcb->asoc.scope.ipv6_addr_legal) {
                                          struct sockaddr_in6 *sin6;
  
                                          if (sctp_ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                                                  continue;
                                          }
  
                                          sin6 = &sctp_ifa->address.sin6;
                                          if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                                                  /*
                                                   * we skip unspecified
                                                   * addresses
                                                   */
                                                  continue;
                                          }
                                          if (prison_check_ip6(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                              &sin6->sin6_addr) != 0) {
                                                  continue;
                                          }
                                          if (stcb->asoc.scope.local_scope == 0 &&
                                              IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
                                                  continue;
                                          if (stcb->asoc.scope.site_scope == 0 &&
                                              IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
                                                  continue;
  
                                          if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
                                              (!sctp_is_addr_pending(stcb, sctp_ifa)))
                                                  continue;
                                          /*
                                           * found a valid local v6 address to
                                           * use
                                           */
                                          if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                                                  SCTP_IPI_ADDR_RUNLOCK();
                                          return (&sctp_ifa->address.sa);
                                  }
                                  break;
  #endif
                          default:
                                  break;
                          }
                  }
          }
          /* no valid addresses found */
          if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                  SCTP_IPI_ADDR_RUNLOCK();
          return (NULL);
  }
  
  static struct sockaddr *
  sctp_find_valid_localaddr_ep(struct sctp_tcb *stcb)
  {
          struct sctp_laddr *laddr;
  
          LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
                  if (laddr->ifa == NULL) {
                          continue;
                  }
                  /* is the address restricted ? */
                  if (sctp_is_addr_restricted(stcb, laddr->ifa) &&
                      (!sctp_is_addr_pending(stcb, laddr->ifa)))
                          continue;
  
                  /* found a valid local address to use */
                  return (&laddr->ifa->address.sa);
          }
          /* no valid addresses found */
          return (NULL);
  }
  
  /*
   * builds an ASCONF chunk from queued ASCONF params.
   * returns NULL on error (no mbuf, no ASCONF params queued, etc).
   */
  struct mbuf *
  sctp_compose_asconf(struct sctp_tcb *stcb, int *retlen, int addr_locked)
  {
          struct mbuf *m_asconf, *m_asconf_chk;
          struct sctp_asconf_addr *aa;
          struct sctp_asconf_chunk *acp;
          struct sctp_asconf_paramhdr *aph;
          struct sctp_asconf_addr_param *aap;
          uint32_t p_length, overhead;
          uint32_t correlation_id = 1;    /* 0 is reserved... */
          caddr_t ptr, lookup_ptr;
          uint8_t lookup_used = 0;
  
          /* are there any asconf params to send? */
          TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
                  if (aa->sent == 0)
                          break;
          }
          if (aa == NULL)
                  return (NULL);
  
          /* Consider IP header and SCTP common header. */
          if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                  overhead = SCTP_MIN_OVERHEAD;
          } else {
                  overhead = SCTP_MIN_V4_OVERHEAD;
          }
          /* Consider ASONF chunk. */
          overhead += sizeof(struct sctp_asconf_chunk);
          /* Consider AUTH chunk. */
          overhead += sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
          if (stcb->asoc.smallest_mtu <= overhead) {
                  /* MTU too small. */
                  return (NULL);
          }
          /*
           * get a chunk header mbuf and a cluster for the asconf params since
           * it's simpler to fill in the asconf chunk header lookup address on
           * the fly
           */
          m_asconf_chk = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_chunk), 0, M_NOWAIT, 1, MT_DATA);
          if (m_asconf_chk == NULL) {
                  /* no mbuf's */
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "sctp_compose_asconf: couldn't get chunk mbuf!\n");
                  return (NULL);
          }
          m_asconf = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
          if (m_asconf == NULL) {
                  /* no mbuf's */
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "sctp_compose_asconf: couldn't get mbuf!\n");
                  sctp_m_freem(m_asconf_chk);
                  return (NULL);
          }
          SCTP_BUF_LEN(m_asconf_chk) = sizeof(struct sctp_asconf_chunk);
          SCTP_BUF_LEN(m_asconf) = 0;
          acp = mtod(m_asconf_chk, struct sctp_asconf_chunk *);
          memset(acp, 0, sizeof(struct sctp_asconf_chunk));
          /* save pointers to lookup address and asconf params */
          lookup_ptr = (caddr_t)(acp + 1);        /* after the header */
          ptr = mtod(m_asconf, caddr_t);  /* beginning of cluster */
  
          /* fill in chunk header info */
          acp->ch.chunk_type = SCTP_ASCONF;
          acp->ch.chunk_flags = 0;
          acp->serial_number = htonl(stcb->asoc.asconf_seq_out);
          stcb->asoc.asconf_seq_out++;
  
          /* add parameters... up to smallest MTU allowed */
          TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
                  if (aa->sent)
                          continue;
                  /* get the parameter length */
                  p_length = SCTP_SIZE32(aa->ap.aph.ph.param_length);
                  /* will it fit in current chunk? */
                  if ((SCTP_BUF_LEN(m_asconf) + p_length > stcb->asoc.smallest_mtu - overhead) ||
                      (SCTP_BUF_LEN(m_asconf) + p_length > MCLBYTES)) {
                          /* won't fit, so we're done with this chunk */
                          break;
                  }
                  /* assign (and store) a correlation id */
                  aa->ap.aph.correlation_id = correlation_id++;
  
                  /*
                   * fill in address if we're doing a delete this is a simple
                   * way for us to fill in the correlation address, which
                   * should only be used by the peer if we're deleting our
                   * source address and adding a new address (e.g. renumbering
                   * case)
                   */
                  if (lookup_used == 0 &&
                      (aa->special_del == 0) &&
                      aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) {
                          struct sctp_ipv6addr_param *lookup;
                          uint16_t p_size, addr_size;
  
                          lookup = (struct sctp_ipv6addr_param *)lookup_ptr;
                          lookup->ph.param_type =
                              htons(aa->ap.addrp.ph.param_type);
                          if (aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) {
                                  /* copy IPv6 address */
                                  p_size = sizeof(struct sctp_ipv6addr_param);
                                  addr_size = sizeof(struct in6_addr);
                          } else {
                                  /* copy IPv4 address */
                                  p_size = sizeof(struct sctp_ipv4addr_param);
                                  addr_size = sizeof(struct in_addr);
                          }
                          lookup->ph.param_length = htons(SCTP_SIZE32(p_size));
                          memcpy(lookup->addr, &aa->ap.addrp.addr, addr_size);
                          SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size);
                          lookup_used = 1;
                  }
                  /* copy into current space */
                  memcpy(ptr, &aa->ap, p_length);
  
                  /* network elements and update lengths */
                  aph = (struct sctp_asconf_paramhdr *)ptr;
                  aap = (struct sctp_asconf_addr_param *)ptr;
                  /* correlation_id is transparent to peer, no htonl needed */
                  aph->ph.param_type = htons(aph->ph.param_type);
                  aph->ph.param_length = htons(aph->ph.param_length);
                  aap->addrp.ph.param_type = htons(aap->addrp.ph.param_type);
                  aap->addrp.ph.param_length = htons(aap->addrp.ph.param_length);
  
                  SCTP_BUF_LEN(m_asconf) += SCTP_SIZE32(p_length);
                  ptr += SCTP_SIZE32(p_length);
  
                  /*
                   * these params are removed off the pending list upon
                   * getting an ASCONF-ACK back from the peer, just set flag
                   */
                  aa->sent = 1;
          }
          /* check to see if the lookup addr has been populated yet */
          if (lookup_used == 0) {
                  /* NOTE: if the address param is optional, can skip this... */
                  /* add any valid (existing) address... */
                  struct sctp_ipv6addr_param *lookup;
                  uint16_t p_size, addr_size;
                  struct sockaddr *found_addr;
                  caddr_t addr_ptr;
  
                  if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL)
                          found_addr = sctp_find_valid_localaddr(stcb,
                              addr_locked);
                  else
                          found_addr = sctp_find_valid_localaddr_ep(stcb);
  
                  lookup = (struct sctp_ipv6addr_param *)lookup_ptr;
                  if (found_addr != NULL) {
                          switch (found_addr->sa_family) {
  #ifdef INET6
                          case AF_INET6:
                                  /* copy IPv6 address */
                                  lookup->ph.param_type =
                                      htons(SCTP_IPV6_ADDRESS);
                                  p_size = sizeof(struct sctp_ipv6addr_param);
                                  addr_size = sizeof(struct in6_addr);
                                  addr_ptr = (caddr_t)&((struct sockaddr_in6 *)
                                      found_addr)->sin6_addr;
                                  break;
  #endif
  #ifdef INET
                          case AF_INET:
                                  /* copy IPv4 address */
                                  lookup->ph.param_type =
                                      htons(SCTP_IPV4_ADDRESS);
                                  p_size = sizeof(struct sctp_ipv4addr_param);
                                  addr_size = sizeof(struct in_addr);
                                  addr_ptr = (caddr_t)&((struct sockaddr_in *)
                                      found_addr)->sin_addr;
                                  break;
  #endif
                          default:
                                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                                      "sctp_compose_asconf: no usable lookup addr (family = %d)!\n",
                                      found_addr->sa_family);
                                  sctp_m_freem(m_asconf_chk);
                                  sctp_m_freem(m_asconf);
                                  return (NULL);
                          }
                          lookup->ph.param_length = htons(SCTP_SIZE32(p_size));
                          memcpy(lookup->addr, addr_ptr, addr_size);
                          SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size);
                  } else {
                          /* uh oh... don't have any address?? */
                          SCTPDBG(SCTP_DEBUG_ASCONF1,
                              "sctp_compose_asconf: no lookup addr!\n");
                          sctp_m_freem(m_asconf_chk);
                          sctp_m_freem(m_asconf);
                          return (NULL);
                  }
          }
          /* chain it all together */
          SCTP_BUF_NEXT(m_asconf_chk) = m_asconf;
          *retlen = SCTP_BUF_LEN(m_asconf_chk) + SCTP_BUF_LEN(m_asconf);
          acp->ch.chunk_length = htons(*retlen);
  
          return (m_asconf_chk);
  }
  
  /*
   * section to handle address changes before an association is up eg. changes
   * during INIT/INIT-ACK/COOKIE-ECHO handshake
   */
  
  /*
   * processes the (local) addresses in the INIT-ACK chunk
   */
  static void
  sctp_process_initack_addresses(struct sctp_tcb *stcb, struct mbuf *m,
      unsigned int offset, unsigned int length)
  {
          struct sctp_paramhdr tmp_param, *ph;
          uint16_t plen, ptype;
          struct sctp_ifa *sctp_ifa;
          union sctp_sockstore store;
  #ifdef INET6
          struct sctp_ipv6addr_param addr6_store;
  #endif
  #ifdef INET
          struct sctp_ipv4addr_param addr4_store;
  #endif
  
          SCTPDBG(SCTP_DEBUG_ASCONF2, "processing init-ack addresses\n");
          if (stcb == NULL)       /* Un-needed check for SA */
                  return;
  
          /* convert to upper bound */
          length += offset;
  
          if ((offset + sizeof(struct sctp_paramhdr)) > length) {
                  return;
          }
          /* go through the addresses in the init-ack */
          ph = (struct sctp_paramhdr *)
              sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr),
              (uint8_t *)&tmp_param);
          while (ph != NULL) {
                  ptype = ntohs(ph->param_type);
                  plen = ntohs(ph->param_length);
                  switch (ptype) {
  #ifdef INET6
                  case SCTP_IPV6_ADDRESS:
                          {
                                  struct sctp_ipv6addr_param *a6p;
  
                                  /* get the entire IPv6 address param */
                                  a6p = (struct sctp_ipv6addr_param *)
                                      sctp_m_getptr(m, offset,
                                      sizeof(struct sctp_ipv6addr_param),
                                      (uint8_t *)&addr6_store);
                                  if (plen != sizeof(struct sctp_ipv6addr_param) ||
                                      a6p == NULL) {
                                          return;
                                  }
                                  memset(&store, 0, sizeof(union sctp_sockstore));
                                  store.sin6.sin6_family = AF_INET6;
                                  store.sin6.sin6_len = sizeof(struct sockaddr_in6);
                                  store.sin6.sin6_port = stcb->rport;
                                  memcpy(&store.sin6.sin6_addr, a6p->addr, sizeof(struct in6_addr));
                                  break;
                          }
  #endif
  #ifdef INET
                  case SCTP_IPV4_ADDRESS:
                          {
                                  struct sctp_ipv4addr_param *a4p;
  
                                  /* get the entire IPv4 address param */
                                  a4p = (struct sctp_ipv4addr_param *)sctp_m_getptr(m, offset,
                                      sizeof(struct sctp_ipv4addr_param),
                                      (uint8_t *)&addr4_store);
                                  if (plen != sizeof(struct sctp_ipv4addr_param) ||
                                      a4p == NULL) {
                                          return;
                                  }
                                  memset(&store, 0, sizeof(union sctp_sockstore));
                                  store.sin.sin_family = AF_INET;
                                  store.sin.sin_len = sizeof(struct sockaddr_in);
                                  store.sin.sin_port = stcb->rport;
                                  store.sin.sin_addr.s_addr = a4p->addr;
                                  break;
                          }
  #endif
                  default:
                          goto next_addr;
                  }
  
                  /* see if this address really (still) exists */
                  sctp_ifa = sctp_find_ifa_by_addr(&store.sa, stcb->asoc.vrf_id,
                      SCTP_ADDR_NOT_LOCKED);
                  if (sctp_ifa == NULL) {
                          /* address doesn't exist anymore */
                          int status;
  
                          /* are ASCONFs allowed ? */
                          if ((sctp_is_feature_on(stcb->sctp_ep,
                              SCTP_PCB_FLAGS_DO_ASCONF)) &&
                              stcb->asoc.asconf_supported) {
                                  /* queue an ASCONF DEL_IP_ADDRESS */
                                  status = sctp_asconf_queue_sa_delete(stcb, &store.sa);
                                  /*
                                   * if queued ok, and in correct state, send
                                   * out the ASCONF.
                                   */
                                  if (status == 0 &&
                                      SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
  #ifdef SCTP_TIMER_BASED_ASCONF
                                          sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
                                              stcb->sctp_ep, stcb,
                                              stcb->asoc.primary_destination);
  #else
                                          sctp_send_asconf(stcb, NULL, SCTP_ADDR_NOT_LOCKED);
  #endif
                                  }
                          }
                  }
  
  next_addr:
                  /*
                   * Sanity check:  Make sure the length isn't 0, otherwise
                   * we'll be stuck in this loop for a long time...
                   */
                  if (SCTP_SIZE32(plen) == 0) {
                          SCTP_PRINTF("process_initack_addrs: bad len (%d) type=%xh\n",
                              plen, ptype);
                          return;
                  }
                  /* get next parameter */
                  offset += SCTP_SIZE32(plen);
                  if ((offset + sizeof(struct sctp_paramhdr)) > length)
                          return;
                  ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
                      sizeof(struct sctp_paramhdr), (uint8_t *)&tmp_param);
          }                       /* while */
  }
  
  /* FIX ME: need to verify return result for v6 address type if v6 disabled */
  /*
   * checks to see if a specific address is in the initack address list returns
   * 1 if found, 0 if not
   */
  static uint32_t
  sctp_addr_in_initack(struct mbuf *m, uint32_t offset, uint32_t length, struct sockaddr *sa)
  {
          struct sctp_paramhdr tmp_param, *ph;
          uint16_t plen, ptype;
  #ifdef INET
          struct sockaddr_in *sin;
          struct sctp_ipv4addr_param *a4p;
          struct sctp_ipv6addr_param addr4_store;
  #endif
  #ifdef INET6
          struct sockaddr_in6 *sin6;
          struct sctp_ipv6addr_param *a6p;
          struct sctp_ipv6addr_param addr6_store;
          struct sockaddr_in6 sin6_tmp;
  #endif
  
          switch (sa->sa_family) {
  #ifdef INET
          case AF_INET:
                  break;
  #endif
  #ifdef INET6
          case AF_INET6:
                  break;
  #endif
          default:
                  return (0);
          }
  
          SCTPDBG(SCTP_DEBUG_ASCONF2, "find_initack_addr: starting search for ");
          SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
          /* convert to upper bound */
          length += offset;
  
          if ((offset + sizeof(struct sctp_paramhdr)) > length) {
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "find_initack_addr: invalid offset?\n");
                  return (0);
          }
          /* go through the addresses in the init-ack */
          ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
              sizeof(struct sctp_paramhdr), (uint8_t *)&tmp_param);
          while (ph != NULL) {
                  ptype = ntohs(ph->param_type);
                  plen = ntohs(ph->param_length);
                  switch (ptype) {
  #ifdef INET6
                  case SCTP_IPV6_ADDRESS:
                          if (sa->sa_family == AF_INET6) {
                                  /* get the entire IPv6 address param */
                                  if (plen != sizeof(struct sctp_ipv6addr_param)) {
                                          break;
                                  }
                                  /* get the entire IPv6 address param */
                                  a6p = (struct sctp_ipv6addr_param *)
                                      sctp_m_getptr(m, offset,
                                      sizeof(struct sctp_ipv6addr_param),
                                      (uint8_t *)&addr6_store);
                                  if (a6p == NULL) {
                                          return (0);
                                  }
                                  sin6 = (struct sockaddr_in6 *)sa;
                                  if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
                                          /* create a copy and clear scope */
                                          memcpy(&sin6_tmp, sin6,
                                              sizeof(struct sockaddr_in6));
                                          sin6 = &sin6_tmp;
                                          in6_clearscope(&sin6->sin6_addr);
                                  }
                                  if (memcmp(&sin6->sin6_addr, a6p->addr,
                                      sizeof(struct in6_addr)) == 0) {
                                          /* found it */
                                          return (1);
                                  }
                          }
                          break;
  #endif                          /* INET6 */
  #ifdef INET
                  case SCTP_IPV4_ADDRESS:
                          if (sa->sa_family == AF_INET) {
                                  if (plen != sizeof(struct sctp_ipv4addr_param)) {
                                          break;
                                  }
                                  /* get the entire IPv4 address param */
                                  a4p = (struct sctp_ipv4addr_param *)
                                      sctp_m_getptr(m, offset,
                                      sizeof(struct sctp_ipv4addr_param),
                                      (uint8_t *)&addr4_store);
                                  if (a4p == NULL) {
                                          return (0);
                                  }
                                  sin = (struct sockaddr_in *)sa;
                                  if (sin->sin_addr.s_addr == a4p->addr) {
                                          /* found it */
                                          return (1);
                                  }
                          }
                          break;
  #endif
                  default:
                          break;
                  }
                  /* get next parameter */
                  offset += SCTP_SIZE32(plen);
                  if (offset + sizeof(struct sctp_paramhdr) > length) {
                          return (0);
                  }
                  ph = (struct sctp_paramhdr *)
                      sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr),
                      (uint8_t *)&tmp_param);
          }                       /* while */
          /* not found! */
          return (0);
  }
  
  /*
   * makes sure that the current endpoint local addr list is consistent with
   * the new association (eg. subset bound, asconf allowed) adds addresses as
   * necessary
   */
  static void
  sctp_check_address_list_ep(struct sctp_tcb *stcb, struct mbuf *m, int offset,
      int length, struct sockaddr *init_addr)
  {
          struct sctp_laddr *laddr;
  
          /* go through the endpoint list */
          LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
                  /* be paranoid and validate the laddr */
                  if (laddr->ifa == NULL) {
                          SCTPDBG(SCTP_DEBUG_ASCONF1,
                              "check_addr_list_ep: laddr->ifa is NULL");
                          continue;
                  }
                  /* do i have it implicitly? */
                  if (sctp_cmpaddr(&laddr->ifa->address.sa, init_addr)) {
                          continue;
                  }
                  /* check to see if in the init-ack */
                  if (!sctp_addr_in_initack(m, offset, length, &laddr->ifa->address.sa)) {
                          /* try to add it */
                          sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb, laddr->ifa,
                              SCTP_ADD_IP_ADDRESS, SCTP_ADDR_NOT_LOCKED);
                  }
          }
  }
  
  /*
   * makes sure that the current kernel address list is consistent with the new
   * association (with all addrs bound) adds addresses as necessary
   */
  static void
  sctp_check_address_list_all(struct sctp_tcb *stcb, struct mbuf *m, int offset,
      int length, struct sockaddr *init_addr,
      uint16_t local_scope, uint16_t site_scope,
      uint16_t ipv4_scope, uint16_t loopback_scope)
  {
          struct sctp_vrf *vrf = NULL;
          struct sctp_ifn *sctp_ifn;
          struct sctp_ifa *sctp_ifa;
          uint32_t vrf_id;
  #ifdef INET
          struct sockaddr_in *sin;
  #endif
  #ifdef INET6
          struct sockaddr_in6 *sin6;
  #endif
  
          if (stcb) {
                  vrf_id = stcb->asoc.vrf_id;
          } else {
                  return;
          }
          SCTP_IPI_ADDR_RLOCK();
          vrf = sctp_find_vrf(vrf_id);
          if (vrf == NULL) {
                  SCTP_IPI_ADDR_RUNLOCK();
                  return;
          }
          /* go through all our known interfaces */
          LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
                  if (loopback_scope == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
                          /* skip loopback interface */
                          continue;
                  }
                  /* go through each interface address */
                  LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                          /* do i have it implicitly? */
                          if (sctp_cmpaddr(&sctp_ifa->address.sa, init_addr)) {
                                  continue;
                          }
                          switch (sctp_ifa->address.sa.sa_family) {
  #ifdef INET
                          case AF_INET:
                                  sin = &sctp_ifa->address.sin;
                                  if (prison_check_ip4(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                      &sin->sin_addr) != 0) {
                                          continue;
                                  }
                                  if ((ipv4_scope == 0) &&
                                      (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
                                          /* private address not in scope */
                                          continue;
                                  }
                                  break;
  #endif
  #ifdef INET6
                          case AF_INET6:
                                  sin6 = &sctp_ifa->address.sin6;
                                  if (prison_check_ip6(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                      &sin6->sin6_addr) != 0) {
                                          continue;
                                  }
                                  if ((local_scope == 0) &&
                                      (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
                                          continue;
                                  }
                                  if ((site_scope == 0) &&
                                      (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
                                          continue;
                                  }
                                  break;
  #endif
                          default:
                                  break;
                          }
                          /* check to see if in the init-ack */
                          if (!sctp_addr_in_initack(m, offset, length, &sctp_ifa->address.sa)) {
                                  /* try to add it */
                                  sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb,
                                      sctp_ifa, SCTP_ADD_IP_ADDRESS,
                                      SCTP_ADDR_LOCKED);
                          }
                  }               /* end foreach ifa */
          }                       /* end foreach ifn */
          SCTP_IPI_ADDR_RUNLOCK();
  }
  
  /*
   * validates an init-ack chunk (from a cookie-echo) with current addresses
   * adds addresses from the init-ack into our local address list, if needed
   * queues asconf adds/deletes addresses as needed and makes appropriate list
   * changes for source address selection m, offset: points to the start of the
   * address list in an init-ack chunk length: total length of the address
   * params only init_addr: address where my INIT-ACK was sent from
   */
  void
  sctp_check_address_list(struct sctp_tcb *stcb, struct mbuf *m, int offset,
      int length, struct sockaddr *init_addr,
      uint16_t local_scope, uint16_t site_scope,
      uint16_t ipv4_scope, uint16_t loopback_scope)
  {
          /* process the local addresses in the initack */
          sctp_process_initack_addresses(stcb, m, offset, length);
  
          if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                  /* bound all case */
                  sctp_check_address_list_all(stcb, m, offset, length, init_addr,
                      local_scope, site_scope, ipv4_scope, loopback_scope);
          } else {
                  /* subset bound case */
                  if (sctp_is_feature_on(stcb->sctp_ep,
                      SCTP_PCB_FLAGS_DO_ASCONF)) {
                          /* asconf's allowed */
                          sctp_check_address_list_ep(stcb, m, offset, length,
                              init_addr);
                  }
                  /* else, no asconfs allowed, so what we sent is what we get */
          }
  }
  
  /*
   * sctp_bindx() support
   */
  uint32_t
  sctp_addr_mgmt_ep_sa(struct sctp_inpcb *inp, struct sockaddr *sa,
      uint32_t type, uint32_t vrf_id)
  {
          struct sctp_ifa *ifa;
          struct sctp_laddr *laddr, *nladdr;
  
          if (sa->sa_len == 0) {
                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EINVAL);
                  return (EINVAL);
          }
          if (type == SCTP_ADD_IP_ADDRESS) {
                  /* For an add the address MUST be on the system */
                  ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
          } else if (type == SCTP_DEL_IP_ADDRESS) {
                  /* For a delete we need to find it in the inp */
                  ifa = sctp_find_ifa_in_ep(inp, sa, SCTP_ADDR_NOT_LOCKED);
          } else {
                  ifa = NULL;
          }
          if (ifa != NULL) {
                  if (type == SCTP_ADD_IP_ADDRESS) {
                          sctp_add_local_addr_ep(inp, ifa, type);
                  } else if (type == SCTP_DEL_IP_ADDRESS) {
                          if (inp->laddr_count < 2) {
                                  /* can't delete the last local address */
                                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EINVAL);
                                  return (EINVAL);
                          }
                          LIST_FOREACH(laddr, &inp->sctp_addr_list,
                              sctp_nxt_addr) {
                                  if (ifa == laddr->ifa) {
                                          /* Mark in the delete */
                                          laddr->action = type;
                                  }
                          }
                  }
                  if (LIST_EMPTY(&inp->sctp_asoc_list)) {
                          /*
                           * There is no need to start the iterator if the inp
                           * has no associations.
                           */
                          if (type == SCTP_DEL_IP_ADDRESS) {
                                  LIST_FOREACH_SAFE(laddr, &inp->sctp_addr_list, sctp_nxt_addr, nladdr) {
                                          if (laddr->ifa == ifa) {
                                                  sctp_del_local_addr_ep(inp, ifa);
                                          }
                                  }
                          }
                  } else {
                          struct sctp_asconf_iterator *asc;
                          struct sctp_laddr *wi;
                          int ret;
  
                          SCTP_MALLOC(asc, struct sctp_asconf_iterator *,
                              sizeof(struct sctp_asconf_iterator),
                              SCTP_M_ASC_IT);
                          if (asc == NULL) {
                                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, ENOMEM);
                                  return (ENOMEM);
                          }
                          wi = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct sctp_laddr);
                          if (wi == NULL) {
                                  SCTP_FREE(asc, SCTP_M_ASC_IT);
                                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, ENOMEM);
                                  return (ENOMEM);
                          }
                          LIST_INIT(&asc->list_of_work);
                          asc->cnt = 1;
                          SCTP_INCR_LADDR_COUNT();
                          wi->ifa = ifa;
                          wi->action = type;
                          atomic_add_int(&ifa->refcount, 1);
                          LIST_INSERT_HEAD(&asc->list_of_work, wi, sctp_nxt_addr);
                          ret = sctp_initiate_iterator(sctp_asconf_iterator_ep,
                              sctp_asconf_iterator_stcb,
                              sctp_asconf_iterator_ep_end,
                              SCTP_PCB_ANY_FLAGS,
                              SCTP_PCB_ANY_FEATURES,
                              SCTP_ASOC_ANY_STATE,
                              (void *)asc, 0,
                              sctp_asconf_iterator_end, inp, 0);
                          if (ret) {
                                  SCTP_PRINTF("Failed to initiate iterator for addr_mgmt_ep_sa\n");
                                  SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EFAULT);
                                  sctp_asconf_iterator_end(asc, 0);
                                  return (EFAULT);
                          }
                  }
                  return (0);
          } else {
                  /* invalid address! */
                  SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EADDRNOTAVAIL);
                  return (EADDRNOTAVAIL);
          }
  }
  
  void
  sctp_asconf_send_nat_state_update(struct sctp_tcb *stcb, struct sctp_nets *net)
  {
          struct sctp_asconf_addr *aa_vtag, *aa_add, *aa_del;
          struct sctp_ifa *sctp_ifap;
          struct sctp_asconf_tag_param *vtag;
  #ifdef INET
          struct sockaddr_in *to;
  #endif
  #ifdef INET6
          struct sockaddr_in6 *to6;
  #endif
  
          if (net == NULL) {
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "sctp_asconf_send_nat_state_update: Missing net\n");
                  return;
          }
          if (stcb == NULL) {
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "sctp_asconf_send_nat_state_update: Missing stcb\n");
                  return;
          }
          /*
           * Need to have in the ASCONF: - VTAG(my_vtag/peer_vtag) -
           * ADD(wildcard) - DEL(wildcard) - ADD(Any global addresses)
           */
          SCTP_MALLOC(aa_vtag, struct sctp_asconf_addr *, sizeof(struct sctp_asconf_addr), SCTP_M_ASC_ADDR);
          SCTP_MALLOC(aa_add, struct sctp_asconf_addr *, sizeof(struct sctp_asconf_addr), SCTP_M_ASC_ADDR);
          SCTP_MALLOC(aa_del, struct sctp_asconf_addr *, sizeof(struct sctp_asconf_addr), SCTP_M_ASC_ADDR);
  
          if ((aa_vtag == NULL) || (aa_add == NULL) || (aa_del == NULL)) {
                  /* Didn't get memory */
                  SCTPDBG(SCTP_DEBUG_ASCONF1, "sctp_asconf_send_nat_state_update: failed to get memory!\n");
  out:
                  if (aa_vtag != NULL) {
                          SCTP_FREE(aa_vtag, SCTP_M_ASC_ADDR);
                  }
                  if (aa_add != NULL) {
                          SCTP_FREE(aa_add, SCTP_M_ASC_ADDR);
                  }
                  if (aa_del != NULL) {
                          SCTP_FREE(aa_del, SCTP_M_ASC_ADDR);
                  }
                  return;
          }
          memset(aa_vtag, 0, sizeof(struct sctp_asconf_addr));
          aa_vtag->special_del = 0;
          /* Fill in ASCONF address parameter fields. */
          /* Top level elements are "networked" during send. */
          aa_vtag->ifa = NULL;
          aa_vtag->sent = 0;      /* clear sent flag */
          vtag = (struct sctp_asconf_tag_param *)&aa_vtag->ap.aph;
          vtag->aph.ph.param_type = SCTP_NAT_VTAGS;
          vtag->aph.ph.param_length = sizeof(struct sctp_asconf_tag_param);
          vtag->local_vtag = htonl(stcb->asoc.my_vtag);
          vtag->remote_vtag = htonl(stcb->asoc.peer_vtag);
  
          memset(aa_add, 0, sizeof(struct sctp_asconf_addr));
          memset(aa_del, 0, sizeof(struct sctp_asconf_addr));
          switch (net->ro._l_addr.sa.sa_family) {
  #ifdef INET
          case AF_INET:
                  aa_add->ap.aph.ph.param_type = SCTP_ADD_IP_ADDRESS;
                  aa_add->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addrv4_param);
                  aa_add->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
                  aa_add->ap.addrp.ph.param_length = sizeof(struct sctp_ipv4addr_param);
                  /* No need to fill the address, we are using 0.0.0.0 */
                  aa_del->ap.aph.ph.param_type = SCTP_DEL_IP_ADDRESS;
                  aa_del->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addrv4_param);
                  aa_del->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
                  aa_del->ap.addrp.ph.param_length = sizeof(struct sctp_ipv4addr_param);
                  /* No need to fill the address, we are using 0.0.0.0 */
                  break;
  #endif
  #ifdef INET6
          case AF_INET6:
                  aa_add->ap.aph.ph.param_type = SCTP_ADD_IP_ADDRESS;
                  aa_add->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addr_param);
                  aa_add->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
                  aa_add->ap.addrp.ph.param_length = sizeof(struct sctp_ipv6addr_param);
                  /* No need to fill the address, we are using ::0 */
                  aa_del->ap.aph.ph.param_type = SCTP_DEL_IP_ADDRESS;
                  aa_del->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addr_param);
                  aa_del->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
                  aa_del->ap.addrp.ph.param_length = sizeof(struct sctp_ipv6addr_param);
                  /* No need to fill the address, we are using ::0 */
                  break;
  #endif
          default:
                  SCTPDBG(SCTP_DEBUG_ASCONF1,
                      "sctp_asconf_send_nat_state_update: unknown address family %d\n",
                      net->ro._l_addr.sa.sa_family);
                  goto out;
          }
          TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa_vtag, next);
          TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa_add, next);
          TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa_del, next);
  
          /* Now we must hunt the addresses and add all global addresses */
          if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                  struct sctp_vrf *vrf = NULL;
                  struct sctp_ifn *sctp_ifnp;
                  uint32_t vrf_id;
  
                  vrf_id = stcb->sctp_ep->def_vrf_id;
                  vrf = sctp_find_vrf(vrf_id);
                  if (vrf == NULL) {
                          goto skip_rest;
                  }
  
                  SCTP_IPI_ADDR_RLOCK();
                  LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
                          LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
                                  switch (sctp_ifap->address.sa.sa_family) {
  #ifdef INET
                                  case AF_INET:
                                          to = &sctp_ifap->address.sin;
                                          if (prison_check_ip4(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                              &to->sin_addr) != 0) {
                                                  continue;
                                          }
                                          if (IN4_ISPRIVATE_ADDRESS(&to->sin_addr)) {
                                                  continue;
                                          }
                                          if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
                                                  continue;
                                          }
                                          break;
  #endif
  #ifdef INET6
                                  case AF_INET6:
                                          to6 = &sctp_ifap->address.sin6;
                                          if (prison_check_ip6(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                              &to6->sin6_addr) != 0) {
                                                  continue;
                                          }
                                          if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
                                                  continue;
                                          }
                                          if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
                                                  continue;
                                          }
                                          break;
  #endif
                                  default:
                                          continue;
                                  }
                                  sctp_asconf_queue_mgmt(stcb, sctp_ifap, SCTP_ADD_IP_ADDRESS);
                          }
                  }
                  SCTP_IPI_ADDR_RUNLOCK();
          } else {
                  struct sctp_laddr *laddr;
  
                  LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
                          if (laddr->ifa == NULL) {
                                  continue;
                          }
                          if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
                                  /*
                                   * Address being deleted by the system, dont
                                   * list.
                                   */
                                  continue;
                          if (laddr->action == SCTP_DEL_IP_ADDRESS) {
                                  /*
                                   * Address being deleted on this ep don't
                                   * list.
                                   */
                                  continue;
                          }
                          sctp_ifap = laddr->ifa;
                          switch (sctp_ifap->address.sa.sa_family) {
  #ifdef INET
                          case AF_INET:
                                  to = &sctp_ifap->address.sin;
                                  if (IN4_ISPRIVATE_ADDRESS(&to->sin_addr)) {
                                          continue;
                                  }
                                  if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
                                          continue;
                                  }
                                  break;
  #endif
  #ifdef INET6
                          case AF_INET6:
                                  to6 = &sctp_ifap->address.sin6;
                                  if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
                                          continue;
                                  }
                                  if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
                                          continue;
                                  }
                                  break;
  #endif
                          default:
                                  continue;
                          }
                          sctp_asconf_queue_mgmt(stcb, sctp_ifap, SCTP_ADD_IP_ADDRESS);
                  }
          }
  skip_rest:
          /* Now we must send the asconf into the queue */
          sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
  }

Cache object: bf9ac9ff69e656c2372aa136638fd4f5