The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_input.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions are met:
    6  *
    7  * a) Redistributions of source code must retain the above copyright notice,
    8  *   this list of conditions and the following disclaimer.
    9  *
   10  * b) Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in
   12  *   the documentation and/or other materials provided with the distribution.
   13  *
   14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   15  *    contributors may be used to endorse or promote products derived
   16  *    from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $   */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <netinet/sctp_var.h>
   38 #include <netinet/sctp_sysctl.h>
   39 #include <netinet/sctp_pcb.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctputil.h>
   42 #include <netinet/sctp_output.h>
   43 #include <netinet/sctp_input.h>
   44 #include <netinet/sctp_auth.h>
   45 #include <netinet/sctp_indata.h>
   46 #include <netinet/sctp_asconf.h>
   47 #include <netinet/sctp_bsd_addr.h>
   48 #include <netinet/sctp_timer.h>
   49 #include <netinet/udp.h>
   50 
   51 
   52 
   53 static void
   54 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
   55 {
   56         struct sctp_nets *net;
   57 
   58         /*
   59          * This now not only stops all cookie timers it also stops any INIT
   60          * timers as well. This will make sure that the timers are stopped
   61          * in all collision cases.
   62          */
   63         SCTP_TCB_LOCK_ASSERT(stcb);
   64         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
   65                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
   66                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
   67                             stcb->sctp_ep,
   68                             stcb,
   69                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
   70                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
   71                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
   72                             stcb->sctp_ep,
   73                             stcb,
   74                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
   75                 }
   76         }
   77 }
   78 
   79 /* INIT handler */
   80 static void
   81 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
   82     struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   83     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
   84 {
   85         struct sctp_init *init;
   86         struct mbuf *op_err;
   87         uint32_t init_limit;
   88 
   89         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
   90             stcb);
   91         if (stcb == NULL) {
   92                 SCTP_INP_RLOCK(inp);
   93                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
   94                         goto outnow;
   95                 }
   96         }
   97         op_err = NULL;
   98         init = &cp->init;
   99         /* First are we accepting? */
  100         if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
  101                 SCTPDBG(SCTP_DEBUG_INPUT2,
  102                     "sctp_handle_init: Abort, so_qlimit:%d\n",
  103                     inp->sctp_socket->so_qlimit);
  104                 /*
  105                  * FIX ME ?? What about TCP model and we have a
  106                  * match/restart case? Actually no fix is needed. the lookup
  107                  * will always find the existing assoc so stcb would not be
  108                  * NULL. It may be questionable to do this since we COULD
  109                  * just send back the INIT-ACK and hope that the app did
  110                  * accept()'s by the time the COOKIE was sent. But there is
  111                  * a price to pay for COOKIE generation and I don't want to
  112                  * pay it on the chance that the app will actually do some
  113                  * accepts(). The App just looses and should NOT be in this
  114                  * state :-)
  115                  */
  116                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
  117                     vrf_id, port);
  118                 if (stcb)
  119                         *abort_no_unlock = 1;
  120                 goto outnow;
  121         }
  122         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
  123                 /* Invalid length */
  124                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  125                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
  126                     vrf_id, port);
  127                 if (stcb)
  128                         *abort_no_unlock = 1;
  129                 goto outnow;
  130         }
  131         /* validate parameters */
  132         if (init->initiate_tag == 0) {
  133                 /* protocol error... send abort */
  134                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  135                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
  136                     vrf_id, port);
  137                 if (stcb)
  138                         *abort_no_unlock = 1;
  139                 goto outnow;
  140         }
  141         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
  142                 /* invalid parameter... send abort */
  143                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  144                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
  145                     vrf_id, port);
  146                 if (stcb)
  147                         *abort_no_unlock = 1;
  148                 goto outnow;
  149         }
  150         if (init->num_inbound_streams == 0) {
  151                 /* protocol error... send abort */
  152                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  153                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
  154                     vrf_id, port);
  155                 if (stcb)
  156                         *abort_no_unlock = 1;
  157                 goto outnow;
  158         }
  159         if (init->num_outbound_streams == 0) {
  160                 /* protocol error... send abort */
  161                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  162                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
  163                     vrf_id, port);
  164                 if (stcb)
  165                         *abort_no_unlock = 1;
  166                 goto outnow;
  167         }
  168         init_limit = offset + ntohs(cp->ch.chunk_length);
  169         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
  170             init_limit)) {
  171                 /* auth parameter(s) error... send abort */
  172                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
  173                 if (stcb)
  174                         *abort_no_unlock = 1;
  175                 goto outnow;
  176         }
  177         /* send an INIT-ACK w/cookie */
  178         SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
  179         sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
  180             ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
  181 outnow:
  182         if (stcb == NULL) {
  183                 SCTP_INP_RUNLOCK(inp);
  184         }
  185 }
  186 
  187 /*
  188  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
  189  */
  190 
  191 int
  192 sctp_is_there_unsent_data(struct sctp_tcb *stcb)
  193 {
  194         int unsent_data = 0;
  195         struct sctp_stream_queue_pending *sp;
  196         struct sctp_stream_out *strq;
  197         struct sctp_association *asoc;
  198 
  199         /*
  200          * This function returns the number of streams that have true unsent
  201          * data on them. Note that as it looks through it will clean up any
  202          * places that have old data that has been sent but left at top of
  203          * stream queue.
  204          */
  205         asoc = &stcb->asoc;
  206         SCTP_TCB_SEND_LOCK(stcb);
  207         if (!TAILQ_EMPTY(&asoc->out_wheel)) {
  208                 /* Check to see if some data queued */
  209                 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) {
  210         is_there_another:
  211                         /* sa_ignore FREED_MEMORY */
  212                         sp = TAILQ_FIRST(&strq->outqueue);
  213                         if (sp == NULL) {
  214                                 continue;
  215                         }
  216                         if ((sp->msg_is_complete) &&
  217                             (sp->length == 0) &&
  218                             (sp->sender_all_done)) {
  219                                 /*
  220                                  * We are doing differed cleanup. Last time
  221                                  * through when we took all the data the
  222                                  * sender_all_done was not set.
  223                                  */
  224                                 if (sp->put_last_out == 0) {
  225                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
  226                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
  227                                             sp->sender_all_done,
  228                                             sp->length,
  229                                             sp->msg_is_complete,
  230                                             sp->put_last_out);
  231                                 }
  232                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
  233                                 TAILQ_REMOVE(&strq->outqueue, sp, next);
  234                                 sctp_free_remote_addr(sp->net);
  235                                 if (sp->data) {
  236                                         sctp_m_freem(sp->data);
  237                                         sp->data = NULL;
  238                                 }
  239                                 sctp_free_a_strmoq(stcb, sp);
  240                                 goto is_there_another;
  241                         } else {
  242                                 unsent_data++;
  243                                 continue;
  244                         }
  245                 }
  246         }
  247         SCTP_TCB_SEND_UNLOCK(stcb);
  248         return (unsent_data);
  249 }
  250 
  251 static int
  252 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
  253     struct sctp_nets *net)
  254 {
  255         struct sctp_init *init;
  256         struct sctp_association *asoc;
  257         struct sctp_nets *lnet;
  258         unsigned int i;
  259 
  260         init = &cp->init;
  261         asoc = &stcb->asoc;
  262         /* save off parameters */
  263         asoc->peer_vtag = ntohl(init->initiate_tag);
  264         asoc->peers_rwnd = ntohl(init->a_rwnd);
  265         if (TAILQ_FIRST(&asoc->nets)) {
  266                 /* update any ssthresh's that may have a default */
  267                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
  268                         lnet->ssthresh = asoc->peers_rwnd;
  269 
  270                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
  271                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
  272                         }
  273                 }
  274         }
  275         SCTP_TCB_SEND_LOCK(stcb);
  276         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
  277                 unsigned int newcnt;
  278                 struct sctp_stream_out *outs;
  279                 struct sctp_stream_queue_pending *sp;
  280 
  281                 /* cut back on number of streams */
  282                 newcnt = ntohs(init->num_inbound_streams);
  283                 /* This if is probably not needed but I am cautious */
  284                 if (asoc->strmout) {
  285                         /* First make sure no data chunks are trapped */
  286                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
  287                                 outs = &asoc->strmout[i];
  288                                 sp = TAILQ_FIRST(&outs->outqueue);
  289                                 while (sp) {
  290                                         TAILQ_REMOVE(&outs->outqueue, sp,
  291                                             next);
  292                                         asoc->stream_queue_cnt--;
  293                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
  294                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
  295                                             sp, SCTP_SO_NOT_LOCKED);
  296                                         if (sp->data) {
  297                                                 sctp_m_freem(sp->data);
  298                                                 sp->data = NULL;
  299                                         }
  300                                         sctp_free_remote_addr(sp->net);
  301                                         sp->net = NULL;
  302                                         /* Free the chunk */
  303                                         SCTP_PRINTF("sp:%p tcb:%p weird free case\n",
  304                                             sp, stcb);
  305 
  306                                         sctp_free_a_strmoq(stcb, sp);
  307                                         /* sa_ignore FREED_MEMORY */
  308                                         sp = TAILQ_FIRST(&outs->outqueue);
  309                                 }
  310                         }
  311                 }
  312                 /* cut back the count and abandon the upper streams */
  313                 asoc->pre_open_streams = newcnt;
  314         }
  315         SCTP_TCB_SEND_UNLOCK(stcb);
  316         asoc->streamoutcnt = asoc->pre_open_streams;
  317         /* init tsn's */
  318         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
  319         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
  320                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
  321         }
  322         /* This is the next one we expect */
  323         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
  324 
  325         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
  326         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
  327         asoc->last_echo_tsn = asoc->asconf_seq_in;
  328         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
  329         /* open the requested streams */
  330 
  331         if (asoc->strmin != NULL) {
  332                 /* Free the old ones */
  333                 struct sctp_queued_to_read *ctl;
  334 
  335                 for (i = 0; i < asoc->streamincnt; i++) {
  336                         ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue);
  337                         while (ctl) {
  338                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
  339                                 sctp_free_remote_addr(ctl->whoFrom);
  340                                 ctl->whoFrom = NULL;
  341                                 sctp_m_freem(ctl->data);
  342                                 ctl->data = NULL;
  343                                 sctp_free_a_readq(stcb, ctl);
  344                                 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue);
  345                         }
  346                 }
  347                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
  348         }
  349         asoc->streamincnt = ntohs(init->num_outbound_streams);
  350         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
  351                 asoc->streamincnt = MAX_SCTP_STREAMS;
  352         }
  353         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
  354             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
  355         if (asoc->strmin == NULL) {
  356                 /* we didn't get memory for the streams! */
  357                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
  358                 return (-1);
  359         }
  360         for (i = 0; i < asoc->streamincnt; i++) {
  361                 asoc->strmin[i].stream_no = i;
  362                 asoc->strmin[i].last_sequence_delivered = 0xffff;
  363                 /*
  364                  * U-stream ranges will be set when the cookie is unpacked.
  365                  * Or for the INIT sender they are un set (if pr-sctp not
  366                  * supported) when the INIT-ACK arrives.
  367                  */
  368                 TAILQ_INIT(&asoc->strmin[i].inqueue);
  369                 asoc->strmin[i].delivery_started = 0;
  370         }
  371         /*
  372          * load_address_from_init will put the addresses into the
  373          * association when the COOKIE is processed or the INIT-ACK is
  374          * processed. Both types of COOKIE's existing and new call this
  375          * routine. It will remove addresses that are no longer in the
  376          * association (for the restarting case where addresses are
  377          * removed). Up front when the INIT arrives we will discard it if it
  378          * is a restart and new addresses have been added.
  379          */
  380         /* sa_ignore MEMLEAK */
  381         return (0);
  382 }
  383 
  384 /*
  385  * INIT-ACK message processing/consumption returns value < 0 on error
  386  */
  387 static int
  388 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
  389     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
  390     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
  391 {
  392         struct sctp_association *asoc;
  393         struct mbuf *op_err;
  394         int retval, abort_flag;
  395         uint32_t initack_limit;
  396 
  397         /* First verify that we have no illegal param's */
  398         abort_flag = 0;
  399         op_err = NULL;
  400 
  401         op_err = sctp_arethere_unrecognized_parameters(m,
  402             (offset + sizeof(struct sctp_init_chunk)),
  403             &abort_flag, (struct sctp_chunkhdr *)cp);
  404         if (abort_flag) {
  405                 /* Send an abort and notify peer */
  406                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
  407                 *abort_no_unlock = 1;
  408                 return (-1);
  409         }
  410         asoc = &stcb->asoc;
  411         /* process the peer's parameters in the INIT-ACK */
  412         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
  413         if (retval < 0) {
  414                 return (retval);
  415         }
  416         initack_limit = offset + ntohs(cp->ch.chunk_length);
  417         /* load all addresses */
  418         if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
  419             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
  420             NULL))) {
  421                 /* Huh, we should abort */
  422                 SCTPDBG(SCTP_DEBUG_INPUT1,
  423                     "Load addresses from INIT causes an abort %d\n",
  424                     retval);
  425                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
  426                     NULL, 0, net->port);
  427                 *abort_no_unlock = 1;
  428                 return (-1);
  429         }
  430         /* if the peer doesn't support asconf, flush the asconf queue */
  431         if (asoc->peer_supports_asconf == 0) {
  432                 struct sctp_asconf_addr *aparam;
  433 
  434                 while (!TAILQ_EMPTY(&asoc->asconf_queue)) {
  435                         /* sa_ignore FREED_MEMORY */
  436                         aparam = TAILQ_FIRST(&asoc->asconf_queue);
  437                         TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
  438                         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
  439                 }
  440         }
  441         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
  442             stcb->asoc.local_hmacs);
  443         if (op_err) {
  444                 sctp_queue_op_err(stcb, op_err);
  445                 /* queuing will steal away the mbuf chain to the out queue */
  446                 op_err = NULL;
  447         }
  448         /* extract the cookie and queue it to "echo" it back... */
  449         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  450                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
  451                     stcb->asoc.overall_error_count,
  452                     0,
  453                     SCTP_FROM_SCTP_INPUT,
  454                     __LINE__);
  455         }
  456         stcb->asoc.overall_error_count = 0;
  457         net->error_count = 0;
  458 
  459         /*
  460          * Cancel the INIT timer, We do this first before queueing the
  461          * cookie. We always cancel at the primary to assue that we are
  462          * canceling the timer started by the INIT which always goes to the
  463          * primary.
  464          */
  465         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
  466             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
  467 
  468         /* calculate the RTO */
  469         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy);
  470 
  471         retval = sctp_send_cookie_echo(m, offset, stcb, net);
  472         if (retval < 0) {
  473                 /*
  474                  * No cookie, we probably should send a op error. But in any
  475                  * case if there is no cookie in the INIT-ACK, we can
  476                  * abandon the peer, its broke.
  477                  */
  478                 if (retval == -3) {
  479                         /* We abort with an error of missing mandatory param */
  480                         op_err =
  481                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
  482                         if (op_err) {
  483                                 /*
  484                                  * Expand beyond to include the mandatory
  485                                  * param cookie
  486                                  */
  487                                 struct sctp_inv_mandatory_param *mp;
  488 
  489                                 SCTP_BUF_LEN(op_err) =
  490                                     sizeof(struct sctp_inv_mandatory_param);
  491                                 mp = mtod(op_err,
  492                                     struct sctp_inv_mandatory_param *);
  493                                 /* Subtract the reserved param */
  494                                 mp->length =
  495                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
  496                                 mp->num_param = htonl(1);
  497                                 mp->param = htons(SCTP_STATE_COOKIE);
  498                                 mp->resv = 0;
  499                         }
  500                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
  501                             sh, op_err, 0, net->port);
  502                         *abort_no_unlock = 1;
  503                 }
  504                 return (retval);
  505         }
  506         return (0);
  507 }
  508 
  509 static void
  510 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
  511     struct sctp_tcb *stcb, struct sctp_nets *net)
  512 {
  513         struct sockaddr_storage store;
  514         struct sockaddr_in *sin;
  515         struct sockaddr_in6 *sin6;
  516         struct sctp_nets *r_net;
  517         struct timeval tv;
  518         int req_prim = 0;
  519 
  520         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
  521                 /* Invalid length */
  522                 return;
  523         }
  524         sin = (struct sockaddr_in *)&store;
  525         sin6 = (struct sockaddr_in6 *)&store;
  526 
  527         memset(&store, 0, sizeof(store));
  528         if (cp->heartbeat.hb_info.addr_family == AF_INET &&
  529             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
  530                 sin->sin_family = cp->heartbeat.hb_info.addr_family;
  531                 sin->sin_len = cp->heartbeat.hb_info.addr_len;
  532                 sin->sin_port = stcb->rport;
  533                 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
  534                     sizeof(sin->sin_addr));
  535         } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 &&
  536             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
  537                 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
  538                 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
  539                 sin6->sin6_port = stcb->rport;
  540                 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
  541                     sizeof(sin6->sin6_addr));
  542         } else {
  543                 return;
  544         }
  545         r_net = sctp_findnet(stcb, (struct sockaddr *)sin);
  546         if (r_net == NULL) {
  547                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
  548                 return;
  549         }
  550         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  551             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
  552             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
  553                 /*
  554                  * If the its a HB and it's random value is correct when can
  555                  * confirm the destination.
  556                  */
  557                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
  558                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
  559                         stcb->asoc.primary_destination = r_net;
  560                         r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY;
  561                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  562                         r_net = TAILQ_FIRST(&stcb->asoc.nets);
  563                         if (r_net != stcb->asoc.primary_destination) {
  564                                 /*
  565                                  * first one on the list is NOT the primary
  566                                  * sctp_cmpaddr() is much more efficent if
  567                                  * the primary is the first on the list,
  568                                  * make it so.
  569                                  */
  570                                 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
  571                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
  572                         }
  573                         req_prim = 1;
  574                 }
  575                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
  576                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
  577         }
  578         r_net->error_count = 0;
  579         r_net->hb_responded = 1;
  580         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
  581         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
  582         if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
  583                 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
  584                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
  585                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
  586                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
  587                 /* now was it the primary? if so restore */
  588                 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
  589                         (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net);
  590                 }
  591         }
  592         /*
  593          * JRS 5/14/07 - If CMT PF is on and the destination is in PF state,
  594          * set the destination to active state and set the cwnd to one or
  595          * two MTU's based on whether PF1 or PF2 is being used. If a T3
  596          * timer is running, for the destination, stop the timer because a
  597          * PF-heartbeat was received.
  598          */
  599         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
  600             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
  601             (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) {
  602                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
  603                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
  604                             stcb, net,
  605                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
  606                 }
  607                 net->dest_state &= ~SCTP_ADDR_PF;
  608                 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
  609                 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n",
  610                     net, net->cwnd);
  611         }
  612         /* Now lets do a RTO with this */
  613         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy);
  614         /* Mobility adaptation */
  615         if (req_prim) {
  616                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
  617                     SCTP_MOBILITY_BASE) ||
  618                     sctp_is_mobility_feature_on(stcb->sctp_ep,
  619                     SCTP_MOBILITY_FASTHANDOFF)) &&
  620                     sctp_is_mobility_feature_on(stcb->sctp_ep,
  621                     SCTP_MOBILITY_PRIM_DELETED)) {
  622 
  623                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
  624                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
  625                             SCTP_MOBILITY_FASTHANDOFF)) {
  626                                 sctp_assoc_immediate_retrans(stcb,
  627                                     stcb->asoc.primary_destination);
  628                         }
  629                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
  630                             SCTP_MOBILITY_BASE)) {
  631                                 sctp_move_chunks_from_deleted_prim(stcb,
  632                                     stcb->asoc.primary_destination);
  633                         }
  634                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
  635                             stcb->asoc.deleted_primary);
  636                 }
  637         }
  638 }
  639 
  640 static void
  641 sctp_handle_abort(struct sctp_abort_chunk *cp,
  642     struct sctp_tcb *stcb, struct sctp_nets *net)
  643 {
  644 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  645         struct socket *so;
  646 
  647 #endif
  648 
  649         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
  650         if (stcb == NULL)
  651                 return;
  652 
  653         /* stop any receive timers */
  654         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
  655         /* notify user of the abort and clean up... */
  656         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
  657         /* free the tcb */
  658 #if defined(SCTP_PANIC_ON_ABORT)
  659         printf("stcb:%p state:%d rport:%d net:%p\n",
  660             stcb, stcb->asoc.state, stcb->rport, net);
  661         if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
  662                 panic("Received an ABORT");
  663         } else {
  664                 printf("No panic its in state %x closed\n", stcb->asoc.state);
  665         }
  666 #endif
  667         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
  668         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
  669             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  670                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  671         }
  672 #ifdef SCTP_ASOCLOG_OF_TSNS
  673         sctp_print_out_track_log(stcb);
  674 #endif
  675 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  676         so = SCTP_INP_SO(stcb->sctp_ep);
  677         atomic_add_int(&stcb->asoc.refcnt, 1);
  678         SCTP_TCB_UNLOCK(stcb);
  679         SCTP_SOCKET_LOCK(so, 1);
  680         SCTP_TCB_LOCK(stcb);
  681         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  682 #endif
  683         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
  684         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
  685             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
  686 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  687         SCTP_SOCKET_UNLOCK(so, 1);
  688 #endif
  689         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
  690 }
  691 
  692 static void
  693 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
  694     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
  695 {
  696         struct sctp_association *asoc;
  697         int some_on_streamwheel;
  698 
  699 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  700         struct socket *so;
  701 
  702 #endif
  703 
  704         SCTPDBG(SCTP_DEBUG_INPUT2,
  705             "sctp_handle_shutdown: handling SHUTDOWN\n");
  706         if (stcb == NULL)
  707                 return;
  708         asoc = &stcb->asoc;
  709         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
  710             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
  711                 return;
  712         }
  713         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
  714                 /* Shutdown NOT the expected size */
  715                 return;
  716         } else {
  717                 sctp_update_acked(stcb, cp, net, abort_flag);
  718         }
  719         if (asoc->control_pdapi) {
  720                 /*
  721                  * With a normal shutdown we assume the end of last record.
  722                  */
  723                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
  724                 asoc->control_pdapi->end_added = 1;
  725                 asoc->control_pdapi->pdapi_aborted = 1;
  726                 asoc->control_pdapi = NULL;
  727                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
  728 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  729                 so = SCTP_INP_SO(stcb->sctp_ep);
  730                 atomic_add_int(&stcb->asoc.refcnt, 1);
  731                 SCTP_TCB_UNLOCK(stcb);
  732                 SCTP_SOCKET_LOCK(so, 1);
  733                 SCTP_TCB_LOCK(stcb);
  734                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  735                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
  736                         /* assoc was freed while we were unlocked */
  737                         SCTP_SOCKET_UNLOCK(so, 1);
  738                         return;
  739                 }
  740 #endif
  741                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
  742 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  743                 SCTP_SOCKET_UNLOCK(so, 1);
  744 #endif
  745         }
  746         /* goto SHUTDOWN_RECEIVED state to block new requests */
  747         if (stcb->sctp_socket) {
  748                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
  749                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
  750                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
  751                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
  752                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  753                         /*
  754                          * notify upper layer that peer has initiated a
  755                          * shutdown
  756                          */
  757                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
  758 
  759                         /* reset time */
  760                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
  761                 }
  762         }
  763         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
  764                 /*
  765                  * stop the shutdown timer, since we WILL move to
  766                  * SHUTDOWN-ACK-SENT.
  767                  */
  768                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
  769         }
  770         /* Now is there unsent data on a stream somewhere? */
  771         some_on_streamwheel = sctp_is_there_unsent_data(stcb);
  772 
  773         if (!TAILQ_EMPTY(&asoc->send_queue) ||
  774             !TAILQ_EMPTY(&asoc->sent_queue) ||
  775             some_on_streamwheel) {
  776                 /* By returning we will push more data out */
  777                 return;
  778         } else {
  779                 /* no outstanding data to send, so move on... */
  780                 /* send SHUTDOWN-ACK */
  781                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
  782                 /* move to SHUTDOWN-ACK-SENT state */
  783                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
  784                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  785                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  786                 }
  787                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
  788                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  789                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
  790                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
  791                 /* start SHUTDOWN timer */
  792                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
  793                     stcb, net);
  794         }
  795 }
  796 
  797 static void
  798 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
  799     struct sctp_tcb *stcb, struct sctp_nets *net)
  800 {
  801         struct sctp_association *asoc;
  802 
  803 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  804         struct socket *so;
  805 
  806         so = SCTP_INP_SO(stcb->sctp_ep);
  807 #endif
  808         SCTPDBG(SCTP_DEBUG_INPUT2,
  809             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
  810         if (stcb == NULL)
  811                 return;
  812 
  813         asoc = &stcb->asoc;
  814         /* process according to association state */
  815         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
  816             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
  817                 /* unexpected SHUTDOWN-ACK... so ignore... */
  818                 SCTP_TCB_UNLOCK(stcb);
  819                 return;
  820         }
  821         if (asoc->control_pdapi) {
  822                 /*
  823                  * With a normal shutdown we assume the end of last record.
  824                  */
  825                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
  826                 asoc->control_pdapi->end_added = 1;
  827                 asoc->control_pdapi->pdapi_aborted = 1;
  828                 asoc->control_pdapi = NULL;
  829                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
  830 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  831                 atomic_add_int(&stcb->asoc.refcnt, 1);
  832                 SCTP_TCB_UNLOCK(stcb);
  833                 SCTP_SOCKET_LOCK(so, 1);
  834                 SCTP_TCB_LOCK(stcb);
  835                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  836                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
  837                         /* assoc was freed while we were unlocked */
  838                         SCTP_SOCKET_UNLOCK(so, 1);
  839                         return;
  840                 }
  841 #endif
  842                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
  843 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  844                 SCTP_SOCKET_UNLOCK(so, 1);
  845 #endif
  846         }
  847         /* are the queues empty? */
  848         if (!TAILQ_EMPTY(&asoc->send_queue) ||
  849             !TAILQ_EMPTY(&asoc->sent_queue) ||
  850             !TAILQ_EMPTY(&asoc->out_wheel)) {
  851                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
  852         }
  853         /* stop the timer */
  854         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
  855         /* send SHUTDOWN-COMPLETE */
  856         sctp_send_shutdown_complete(stcb, net);
  857         /* notify upper layer protocol */
  858         if (stcb->sctp_socket) {
  859                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
  860                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
  861                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
  862                         /* Set the connected flag to disconnected */
  863                         stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
  864                 }
  865         }
  866         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
  867         /* free the TCB but first save off the ep */
  868 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  869         atomic_add_int(&stcb->asoc.refcnt, 1);
  870         SCTP_TCB_UNLOCK(stcb);
  871         SCTP_SOCKET_LOCK(so, 1);
  872         SCTP_TCB_LOCK(stcb);
  873         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  874 #endif
  875         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
  876             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
  877 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  878         SCTP_SOCKET_UNLOCK(so, 1);
  879 #endif
  880 }
  881 
  882 /*
  883  * Skip past the param header and then we will find the chunk that caused the
  884  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
  885  * our peer must be broken.
  886  */
  887 static void
  888 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
  889     struct sctp_nets *net)
  890 {
  891         struct sctp_chunkhdr *chk;
  892 
  893         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
  894         switch (chk->chunk_type) {
  895         case SCTP_ASCONF_ACK:
  896         case SCTP_ASCONF:
  897                 sctp_asconf_cleanup(stcb, net);
  898                 break;
  899         case SCTP_FORWARD_CUM_TSN:
  900                 stcb->asoc.peer_supports_prsctp = 0;
  901                 break;
  902         default:
  903                 SCTPDBG(SCTP_DEBUG_INPUT2,
  904                     "Peer does not support chunk type %d(%x)??\n",
  905                     chk->chunk_type, (uint32_t) chk->chunk_type);
  906                 break;
  907         }
  908 }
  909 
  910 /*
  911  * Skip past the param header and then we will find the param that caused the
  912  * problem.  There are a number of param's in a ASCONF OR the prsctp param
  913  * these will turn of specific features.
  914  */
  915 static void
  916 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
  917 {
  918         struct sctp_paramhdr *pbad;
  919 
  920         pbad = phdr + 1;
  921         switch (ntohs(pbad->param_type)) {
  922                 /* pr-sctp draft */
  923         case SCTP_PRSCTP_SUPPORTED:
  924                 stcb->asoc.peer_supports_prsctp = 0;
  925                 break;
  926         case SCTP_SUPPORTED_CHUNK_EXT:
  927                 break;
  928                 /* draft-ietf-tsvwg-addip-sctp */
  929         case SCTP_ECN_NONCE_SUPPORTED:
  930                 stcb->asoc.peer_supports_ecn_nonce = 0;
  931                 stcb->asoc.ecn_nonce_allowed = 0;
  932                 stcb->asoc.ecn_allowed = 0;
  933                 break;
  934         case SCTP_ADD_IP_ADDRESS:
  935         case SCTP_DEL_IP_ADDRESS:
  936         case SCTP_SET_PRIM_ADDR:
  937                 stcb->asoc.peer_supports_asconf = 0;
  938                 break;
  939         case SCTP_SUCCESS_REPORT:
  940         case SCTP_ERROR_CAUSE_IND:
  941                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
  942                 SCTPDBG(SCTP_DEBUG_INPUT2,
  943                     "Turning off ASCONF to this strange peer\n");
  944                 stcb->asoc.peer_supports_asconf = 0;
  945                 break;
  946         default:
  947                 SCTPDBG(SCTP_DEBUG_INPUT2,
  948                     "Peer does not support param type %d(%x)??\n",
  949                     pbad->param_type, (uint32_t) pbad->param_type);
  950                 break;
  951         }
  952 }
  953 
  954 static int
  955 sctp_handle_error(struct sctp_chunkhdr *ch,
  956     struct sctp_tcb *stcb, struct sctp_nets *net)
  957 {
  958         int chklen;
  959         struct sctp_paramhdr *phdr;
  960         uint16_t error_type;
  961         uint16_t error_len;
  962         struct sctp_association *asoc;
  963         int adjust;
  964 
  965 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  966         struct socket *so;
  967 
  968 #endif
  969 
  970         /* parse through all of the errors and process */
  971         asoc = &stcb->asoc;
  972         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
  973             sizeof(struct sctp_chunkhdr));
  974         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
  975         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
  976                 /* Process an Error Cause */
  977                 error_type = ntohs(phdr->param_type);
  978                 error_len = ntohs(phdr->param_length);
  979                 if ((error_len > chklen) || (error_len == 0)) {
  980                         /* invalid param length for this param */
  981                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
  982                             chklen, error_len);
  983                         return (0);
  984                 }
  985                 switch (error_type) {
  986                 case SCTP_CAUSE_INVALID_STREAM:
  987                 case SCTP_CAUSE_MISSING_PARAM:
  988                 case SCTP_CAUSE_INVALID_PARAM:
  989                 case SCTP_CAUSE_NO_USER_DATA:
  990                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
  991                             error_type);
  992                         break;
  993                 case SCTP_CAUSE_STALE_COOKIE:
  994                         /*
  995                          * We only act if we have echoed a cookie and are
  996                          * waiting.
  997                          */
  998                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
  999                                 int *p;
 1000 
 1001                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
 1002                                 /* Save the time doubled */
 1003                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
 1004                                 asoc->stale_cookie_count++;
 1005                                 if (asoc->stale_cookie_count >
 1006                                     asoc->max_init_times) {
 1007                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 1008                                         /* now free the asoc */
 1009 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1010                                         so = SCTP_INP_SO(stcb->sctp_ep);
 1011                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 1012                                         SCTP_TCB_UNLOCK(stcb);
 1013                                         SCTP_SOCKET_LOCK(so, 1);
 1014                                         SCTP_TCB_LOCK(stcb);
 1015                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1016 #endif
 1017                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 1018                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
 1019 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1020                                         SCTP_SOCKET_UNLOCK(so, 1);
 1021 #endif
 1022                                         return (-1);
 1023                                 }
 1024                                 /* blast back to INIT state */
 1025                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
 1026                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
 1027 
 1028                                 sctp_stop_all_cookie_timers(stcb);
 1029                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 1030                         }
 1031                         break;
 1032                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
 1033                         /*
 1034                          * Nothing we can do here, we don't do hostname
 1035                          * addresses so if the peer does not like my IPv6
 1036                          * (or IPv4 for that matter) it does not matter. If
 1037                          * they don't support that type of address, they can
 1038                          * NOT possibly get that packet type... i.e. with no
 1039                          * IPv6 you can't recieve a IPv6 packet. so we can
 1040                          * safely ignore this one. If we ever added support
 1041                          * for HOSTNAME Addresses, then we would need to do
 1042                          * something here.
 1043                          */
 1044                         break;
 1045                 case SCTP_CAUSE_UNRECOG_CHUNK:
 1046                         sctp_process_unrecog_chunk(stcb, phdr, net);
 1047                         break;
 1048                 case SCTP_CAUSE_UNRECOG_PARAM:
 1049                         sctp_process_unrecog_param(stcb, phdr);
 1050                         break;
 1051                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
 1052                         /*
 1053                          * We ignore this since the timer will drive out a
 1054                          * new cookie anyway and there timer will drive us
 1055                          * to send a SHUTDOWN_COMPLETE. We can't send one
 1056                          * here since we don't have their tag.
 1057                          */
 1058                         break;
 1059                 case SCTP_CAUSE_DELETING_LAST_ADDR:
 1060                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
 1061                 case SCTP_CAUSE_DELETING_SRC_ADDR:
 1062                         /*
 1063                          * We should NOT get these here, but in a
 1064                          * ASCONF-ACK.
 1065                          */
 1066                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
 1067                             error_type);
 1068                         break;
 1069                 case SCTP_CAUSE_OUT_OF_RESC:
 1070                         /*
 1071                          * And what, pray tell do we do with the fact that
 1072                          * the peer is out of resources? Not really sure we
 1073                          * could do anything but abort. I suspect this
 1074                          * should have came WITH an abort instead of in a
 1075                          * OP-ERROR.
 1076                          */
 1077                         break;
 1078                 default:
 1079                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
 1080                             error_type);
 1081                         break;
 1082                 }
 1083                 adjust = SCTP_SIZE32(error_len);
 1084                 chklen -= adjust;
 1085                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
 1086         }
 1087         return (0);
 1088 }
 1089 
 1090 static int
 1091 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
 1092     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 1093     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 1094 {
 1095         struct sctp_init_ack *init_ack;
 1096         struct mbuf *op_err;
 1097 
 1098         SCTPDBG(SCTP_DEBUG_INPUT2,
 1099             "sctp_handle_init_ack: handling INIT-ACK\n");
 1100 
 1101         if (stcb == NULL) {
 1102                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1103                     "sctp_handle_init_ack: TCB is null\n");
 1104                 return (-1);
 1105         }
 1106         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
 1107                 /* Invalid length */
 1108                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1109                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 1110                     op_err, 0, net->port);
 1111                 *abort_no_unlock = 1;
 1112                 return (-1);
 1113         }
 1114         init_ack = &cp->init;
 1115         /* validate parameters */
 1116         if (init_ack->initiate_tag == 0) {
 1117                 /* protocol error... send an abort */
 1118                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1119                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 1120                     op_err, 0, net->port);
 1121                 *abort_no_unlock = 1;
 1122                 return (-1);
 1123         }
 1124         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
 1125                 /* protocol error... send an abort */
 1126                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1127                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 1128                     op_err, 0, net->port);
 1129                 *abort_no_unlock = 1;
 1130                 return (-1);
 1131         }
 1132         if (init_ack->num_inbound_streams == 0) {
 1133                 /* protocol error... send an abort */
 1134                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1135                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 1136                     op_err, 0, net->port);
 1137                 *abort_no_unlock = 1;
 1138                 return (-1);
 1139         }
 1140         if (init_ack->num_outbound_streams == 0) {
 1141                 /* protocol error... send an abort */
 1142                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1143                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 1144                     op_err, 0, net->port);
 1145                 *abort_no_unlock = 1;
 1146                 return (-1);
 1147         }
 1148         /* process according to association state... */
 1149         switch (stcb->asoc.state & SCTP_STATE_MASK) {
 1150         case SCTP_STATE_COOKIE_WAIT:
 1151                 /* this is the expected state for this chunk */
 1152                 /* process the INIT-ACK parameters */
 1153                 if (stcb->asoc.primary_destination->dest_state &
 1154                     SCTP_ADDR_UNCONFIRMED) {
 1155                         /*
 1156                          * The primary is where we sent the INIT, we can
 1157                          * always consider it confirmed when the INIT-ACK is
 1158                          * returned. Do this before we load addresses
 1159                          * though.
 1160                          */
 1161                         stcb->asoc.primary_destination->dest_state &=
 1162                             ~SCTP_ADDR_UNCONFIRMED;
 1163                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 1164                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
 1165                 }
 1166                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
 1167                     net, abort_no_unlock, vrf_id) < 0) {
 1168                         /* error in parsing parameters */
 1169                         return (-1);
 1170                 }
 1171                 /* update our state */
 1172                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
 1173                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
 1174 
 1175                 /* reset the RTO calc */
 1176                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 1177                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 1178                             stcb->asoc.overall_error_count,
 1179                             0,
 1180                             SCTP_FROM_SCTP_INPUT,
 1181                             __LINE__);
 1182                 }
 1183                 stcb->asoc.overall_error_count = 0;
 1184                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 1185                 /*
 1186                  * collapse the init timer back in case of a exponential
 1187                  * backoff
 1188                  */
 1189                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
 1190                     stcb, net);
 1191                 /*
 1192                  * the send at the end of the inbound data processing will
 1193                  * cause the cookie to be sent
 1194                  */
 1195                 break;
 1196         case SCTP_STATE_SHUTDOWN_SENT:
 1197                 /* incorrect state... discard */
 1198                 break;
 1199         case SCTP_STATE_COOKIE_ECHOED:
 1200                 /* incorrect state... discard */
 1201                 break;
 1202         case SCTP_STATE_OPEN:
 1203                 /* incorrect state... discard */
 1204                 break;
 1205         case SCTP_STATE_EMPTY:
 1206         case SCTP_STATE_INUSE:
 1207         default:
 1208                 /* incorrect state... discard */
 1209                 return (-1);
 1210                 break;
 1211         }
 1212         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
 1213         return (0);
 1214 }
 1215 
 1216 
 1217 /*
 1218  * handle a state cookie for an existing association m: input packet mbuf
 1219  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
 1220  * "split" mbuf and the cookie signature does not exist offset: offset into
 1221  * mbuf to the cookie-echo chunk
 1222  */
 1223 static struct sctp_tcb *
 1224 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
 1225     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 1226     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
 1227     struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id,
 1228     uint32_t vrf_id)
 1229 {
 1230         struct sctp_association *asoc;
 1231         struct sctp_init_chunk *init_cp, init_buf;
 1232         struct sctp_init_ack_chunk *initack_cp, initack_buf;
 1233         int chk_length;
 1234         int init_offset, initack_offset, i;
 1235         int retval;
 1236         int spec_flag = 0;
 1237         uint32_t how_indx;
 1238 
 1239         /* I know that the TCB is non-NULL from the caller */
 1240         asoc = &stcb->asoc;
 1241         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
 1242                 if (asoc->cookie_how[how_indx] == 0)
 1243                         break;
 1244         }
 1245         if (how_indx < sizeof(asoc->cookie_how)) {
 1246                 asoc->cookie_how[how_indx] = 1;
 1247         }
 1248         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 1249                 /* SHUTDOWN came in after sending INIT-ACK */
 1250                 struct mbuf *op_err;
 1251                 struct sctp_paramhdr *ph;
 1252 
 1253                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 1254                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 1255                     0, M_DONTWAIT, 1, MT_DATA);
 1256                 if (op_err == NULL) {
 1257                         /* FOOBAR */
 1258                         return (NULL);
 1259                 }
 1260                 /* pre-reserve some space */
 1261 #ifdef INET6
 1262                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 1263 #else
 1264                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 1265 #endif
 1266                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 1267                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 1268                 /* Set the len */
 1269                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
 1270                 ph = mtod(op_err, struct sctp_paramhdr *);
 1271                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
 1272                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
 1273                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
 1274                     vrf_id, net->port);
 1275                 if (how_indx < sizeof(asoc->cookie_how))
 1276                         asoc->cookie_how[how_indx] = 2;
 1277                 return (NULL);
 1278         }
 1279         /*
 1280          * find and validate the INIT chunk in the cookie (peer's info) the
 1281          * INIT should start after the cookie-echo header struct (chunk
 1282          * header, state cookie header struct)
 1283          */
 1284         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
 1285 
 1286         init_cp = (struct sctp_init_chunk *)
 1287             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
 1288             (uint8_t *) & init_buf);
 1289         if (init_cp == NULL) {
 1290                 /* could not pull a INIT chunk in cookie */
 1291                 return (NULL);
 1292         }
 1293         chk_length = ntohs(init_cp->ch.chunk_length);
 1294         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
 1295                 return (NULL);
 1296         }
 1297         /*
 1298          * find and validate the INIT-ACK chunk in the cookie (my info) the
 1299          * INIT-ACK follows the INIT chunk
 1300          */
 1301         initack_offset = init_offset + SCTP_SIZE32(chk_length);
 1302         initack_cp = (struct sctp_init_ack_chunk *)
 1303             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
 1304             (uint8_t *) & initack_buf);
 1305         if (initack_cp == NULL) {
 1306                 /* could not pull INIT-ACK chunk in cookie */
 1307                 return (NULL);
 1308         }
 1309         chk_length = ntohs(initack_cp->ch.chunk_length);
 1310         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
 1311                 return (NULL);
 1312         }
 1313         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1314             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
 1315                 /*
 1316                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
 1317                  * to get into the OPEN state
 1318                  */
 1319                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
 1320                         /*-
 1321                          * Opps, this means that we somehow generated two vtag's
 1322                          * the same. I.e. we did:
 1323                          *  Us               Peer
 1324                          *   <---INIT(tag=a)------
 1325                          *   ----INIT-ACK(tag=t)-->
 1326                          *   ----INIT(tag=t)------> *1
 1327                          *   <---INIT-ACK(tag=a)---
 1328                          *   <----CE(tag=t)------------- *2
 1329                          *
 1330                          * At point *1 we should be generating a different
 1331                          * tag t'. Which means we would throw away the CE and send
 1332                          * ours instead. Basically this is case C (throw away side).
 1333                          */
 1334                         if (how_indx < sizeof(asoc->cookie_how))
 1335                                 asoc->cookie_how[how_indx] = 17;
 1336                         return (NULL);
 1337 
 1338                 }
 1339                 switch SCTP_GET_STATE
 1340                         (asoc) {
 1341                 case SCTP_STATE_COOKIE_WAIT:
 1342                 case SCTP_STATE_COOKIE_ECHOED:
 1343                         /*
 1344                          * INIT was sent but got a COOKIE_ECHO with the
 1345                          * correct tags... just accept it...but we must
 1346                          * process the init so that we can make sure we have
 1347                          * the right seq no's.
 1348                          */
 1349                         /* First we must process the INIT !! */
 1350                         retval = sctp_process_init(init_cp, stcb, net);
 1351                         if (retval < 0) {
 1352                                 if (how_indx < sizeof(asoc->cookie_how))
 1353                                         asoc->cookie_how[how_indx] = 3;
 1354                                 return (NULL);
 1355                         }
 1356                         /* we have already processed the INIT so no problem */
 1357                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
 1358                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
 1359                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
 1360                         /* update current state */
 1361                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
 1362                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 1363                         else
 1364                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1365 
 1366                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1367                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1368                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1369                                     stcb->sctp_ep, stcb, asoc->primary_destination);
 1370                         }
 1371                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1372                         sctp_stop_all_cookie_timers(stcb);
 1373                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1374                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 1375                             (inp->sctp_socket->so_qlimit == 0)
 1376                             ) {
 1377 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1378                                 struct socket *so;
 1379 
 1380 #endif
 1381                                 /*
 1382                                  * Here is where collision would go if we
 1383                                  * did a connect() and instead got a
 1384                                  * init/init-ack/cookie done before the
 1385                                  * init-ack came back..
 1386                                  */
 1387                                 stcb->sctp_ep->sctp_flags |=
 1388                                     SCTP_PCB_FLAGS_CONNECTED;
 1389 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1390                                 so = SCTP_INP_SO(stcb->sctp_ep);
 1391                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1392                                 SCTP_TCB_UNLOCK(stcb);
 1393                                 SCTP_SOCKET_LOCK(so, 1);
 1394                                 SCTP_TCB_LOCK(stcb);
 1395                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1396                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1397                                         SCTP_SOCKET_UNLOCK(so, 1);
 1398                                         return (NULL);
 1399                                 }
 1400 #endif
 1401                                 soisconnected(stcb->sctp_socket);
 1402 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1403                                 SCTP_SOCKET_UNLOCK(so, 1);
 1404 #endif
 1405                         }
 1406                         /* notify upper layer */
 1407                         *notification = SCTP_NOTIFY_ASSOC_UP;
 1408                         /*
 1409                          * since we did not send a HB make sure we don't
 1410                          * double things
 1411                          */
 1412                         net->hb_responded = 1;
 1413                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
 1414                             &cookie->time_entered, sctp_align_unsafe_makecopy);
 1415 
 1416                         if (stcb->asoc.sctp_autoclose_ticks &&
 1417                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
 1418                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
 1419                                     inp, stcb, NULL);
 1420                         }
 1421                         break;
 1422                 default:
 1423                         /*
 1424                          * we're in the OPEN state (or beyond), so peer must
 1425                          * have simply lost the COOKIE-ACK
 1426                          */
 1427                         break;
 1428                         }       /* end switch */
 1429                 sctp_stop_all_cookie_timers(stcb);
 1430                 /*
 1431                  * We ignore the return code here.. not sure if we should
 1432                  * somehow abort.. but we do have an existing asoc. This
 1433                  * really should not fail.
 1434                  */
 1435                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
 1436                     init_offset + sizeof(struct sctp_init_chunk),
 1437                     initack_offset, sh, init_src)) {
 1438                         if (how_indx < sizeof(asoc->cookie_how))
 1439                                 asoc->cookie_how[how_indx] = 4;
 1440                         return (NULL);
 1441                 }
 1442                 /* respond with a COOKIE-ACK */
 1443                 sctp_toss_old_cookies(stcb, asoc);
 1444                 sctp_send_cookie_ack(stcb);
 1445                 if (how_indx < sizeof(asoc->cookie_how))
 1446                         asoc->cookie_how[how_indx] = 5;
 1447                 return (stcb);
 1448         }
 1449         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
 1450             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
 1451             cookie->tie_tag_my_vtag == 0 &&
 1452             cookie->tie_tag_peer_vtag == 0) {
 1453                 /*
 1454                  * case C in Section 5.2.4 Table 2: XMOO silently discard
 1455                  */
 1456                 if (how_indx < sizeof(asoc->cookie_how))
 1457                         asoc->cookie_how[how_indx] = 6;
 1458                 return (NULL);
 1459         }
 1460         if (ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag &&
 1461             (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag ||
 1462             init_cp->init.initiate_tag == 0)) {
 1463                 /*
 1464                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
 1465                  * should be ok, re-accept peer info
 1466                  */
 1467                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
 1468                         /*
 1469                          * Extension of case C. If we hit this, then the
 1470                          * random number generator returned the same vtag
 1471                          * when we first sent our INIT-ACK and when we later
 1472                          * sent our INIT. The side with the seq numbers that
 1473                          * are different will be the one that normnally
 1474                          * would have hit case C. This in effect "extends"
 1475                          * our vtags in this collision case to be 64 bits.
 1476                          * The same collision could occur aka you get both
 1477                          * vtag and seq number the same twice in a row.. but
 1478                          * is much less likely. If it did happen then we
 1479                          * would proceed through and bring up the assoc.. we
 1480                          * may end up with the wrong stream setup however..
 1481                          * which would be bad.. but there is no way to
 1482                          * tell.. until we send on a stream that does not
 1483                          * exist :-)
 1484                          */
 1485                         if (how_indx < sizeof(asoc->cookie_how))
 1486                                 asoc->cookie_how[how_indx] = 7;
 1487 
 1488                         return (NULL);
 1489                 }
 1490                 if (how_indx < sizeof(asoc->cookie_how))
 1491                         asoc->cookie_how[how_indx] = 8;
 1492                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
 1493                 sctp_stop_all_cookie_timers(stcb);
 1494                 /*
 1495                  * since we did not send a HB make sure we don't double
 1496                  * things
 1497                  */
 1498                 net->hb_responded = 1;
 1499                 if (stcb->asoc.sctp_autoclose_ticks &&
 1500                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1501                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1502                             NULL);
 1503                 }
 1504                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 1505                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
 1506 
 1507                 /* Note last_cwr_tsn? where is this used? */
 1508                 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
 1509                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
 1510                         /*
 1511                          * Ok the peer probably discarded our data (if we
 1512                          * echoed a cookie+data). So anything on the
 1513                          * sent_queue should be marked for retransmit, we
 1514                          * may not get something to kick us so it COULD
 1515                          * still take a timeout to move these.. but it can't
 1516                          * hurt to mark them.
 1517                          */
 1518                         struct sctp_tmit_chunk *chk;
 1519 
 1520                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 1521                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
 1522                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1523                                         sctp_flight_size_decrease(chk);
 1524                                         sctp_total_flight_decrease(stcb, chk);
 1525                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1526                                         spec_flag++;
 1527                                 }
 1528                         }
 1529 
 1530                 }
 1531                 /* process the INIT info (peer's info) */
 1532                 retval = sctp_process_init(init_cp, stcb, net);
 1533                 if (retval < 0) {
 1534                         if (how_indx < sizeof(asoc->cookie_how))
 1535                                 asoc->cookie_how[how_indx] = 9;
 1536                         return (NULL);
 1537                 }
 1538                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
 1539                     init_offset + sizeof(struct sctp_init_chunk),
 1540                     initack_offset, sh, init_src)) {
 1541                         if (how_indx < sizeof(asoc->cookie_how))
 1542                                 asoc->cookie_how[how_indx] = 10;
 1543                         return (NULL);
 1544                 }
 1545                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
 1546                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
 1547                         *notification = SCTP_NOTIFY_ASSOC_UP;
 1548 
 1549                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1550                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 1551                             (inp->sctp_socket->so_qlimit == 0)) {
 1552 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1553                                 struct socket *so;
 1554 
 1555 #endif
 1556                                 stcb->sctp_ep->sctp_flags |=
 1557                                     SCTP_PCB_FLAGS_CONNECTED;
 1558 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1559                                 so = SCTP_INP_SO(stcb->sctp_ep);
 1560                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1561                                 SCTP_TCB_UNLOCK(stcb);
 1562                                 SCTP_SOCKET_LOCK(so, 1);
 1563                                 SCTP_TCB_LOCK(stcb);
 1564                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1565                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1566                                         SCTP_SOCKET_UNLOCK(so, 1);
 1567                                         return (NULL);
 1568                                 }
 1569 #endif
 1570                                 soisconnected(stcb->sctp_socket);
 1571 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1572                                 SCTP_SOCKET_UNLOCK(so, 1);
 1573 #endif
 1574                         }
 1575                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
 1576                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 1577                         else
 1578                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1579                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1580                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 1581                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
 1582                 } else {
 1583                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1584                 }
 1585                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1586                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1587                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1588                             stcb->sctp_ep, stcb, asoc->primary_destination);
 1589                 }
 1590                 sctp_stop_all_cookie_timers(stcb);
 1591                 sctp_toss_old_cookies(stcb, asoc);
 1592                 sctp_send_cookie_ack(stcb);
 1593                 if (spec_flag) {
 1594                         /*
 1595                          * only if we have retrans set do we do this. What
 1596                          * this call does is get only the COOKIE-ACK out and
 1597                          * then when we return the normal call to
 1598                          * sctp_chunk_output will get the retrans out behind
 1599                          * this.
 1600                          */
 1601                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
 1602                 }
 1603                 if (how_indx < sizeof(asoc->cookie_how))
 1604                         asoc->cookie_how[how_indx] = 11;
 1605 
 1606                 return (stcb);
 1607         }
 1608         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
 1609             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
 1610             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
 1611             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
 1612             cookie->tie_tag_peer_vtag != 0) {
 1613                 struct sctpasochead *head;
 1614 
 1615                 /*
 1616                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
 1617                  */
 1618                 /* temp code */
 1619                 if (how_indx < sizeof(asoc->cookie_how))
 1620                         asoc->cookie_how[how_indx] = 12;
 1621                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
 1622                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
 1623 
 1624                 *sac_assoc_id = sctp_get_associd(stcb);
 1625                 /* notify upper layer */
 1626                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
 1627                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1628                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
 1629                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 1630                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 1631                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1632                 }
 1633                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 1634                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
 1635                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1636                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
 1637                 }
 1638                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1639                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1640                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1641                             stcb->sctp_ep, stcb, asoc->primary_destination);
 1642 
 1643                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
 1644                         /* move to OPEN state, if not in SHUTDOWN_SENT */
 1645                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1646                 }
 1647                 asoc->pre_open_streams =
 1648                     ntohs(initack_cp->init.num_outbound_streams);
 1649                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
 1650                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
 1651                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
 1652 
 1653                 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
 1654                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
 1655 
 1656                 asoc->str_reset_seq_in = asoc->init_seq_number;
 1657 
 1658                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 1659                 if (asoc->mapping_array) {
 1660                         memset(asoc->mapping_array, 0,
 1661                             asoc->mapping_array_size);
 1662                 }
 1663                 SCTP_TCB_UNLOCK(stcb);
 1664                 SCTP_INP_INFO_WLOCK();
 1665                 SCTP_INP_WLOCK(stcb->sctp_ep);
 1666                 SCTP_TCB_LOCK(stcb);
 1667                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1668                 /* send up all the data */
 1669                 SCTP_TCB_SEND_LOCK(stcb);
 1670 
 1671                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
 1672                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1673                         stcb->asoc.strmout[i].stream_no = i;
 1674                         stcb->asoc.strmout[i].next_sequence_sent = 0;
 1675                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
 1676                 }
 1677                 /* process the INIT-ACK info (my info) */
 1678                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
 1679                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 1680 
 1681                 /* pull from vtag hash */
 1682                 LIST_REMOVE(stcb, sctp_asocs);
 1683                 /* re-insert to new vtag position */
 1684                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
 1685                     SCTP_BASE_INFO(hashasocmark))];
 1686                 /*
 1687                  * put it in the bucket in the vtag hash of assoc's for the
 1688                  * system
 1689                  */
 1690                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 1691 
 1692                 /* Is this the first restart? */
 1693                 if (stcb->asoc.in_restart_hash == 0) {
 1694                         /* Ok add it to assoc_id vtag hash */
 1695                         head = &SCTP_BASE_INFO(sctp_restarthash)[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id,
 1696                             SCTP_BASE_INFO(hashrestartmark))];
 1697                         LIST_INSERT_HEAD(head, stcb, sctp_tcbrestarhash);
 1698                         stcb->asoc.in_restart_hash = 1;
 1699                 }
 1700                 /* process the INIT info (peer's info) */
 1701                 SCTP_TCB_SEND_UNLOCK(stcb);
 1702                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
 1703                 SCTP_INP_INFO_WUNLOCK();
 1704 
 1705                 retval = sctp_process_init(init_cp, stcb, net);
 1706                 if (retval < 0) {
 1707                         if (how_indx < sizeof(asoc->cookie_how))
 1708                                 asoc->cookie_how[how_indx] = 13;
 1709 
 1710                         return (NULL);
 1711                 }
 1712                 /*
 1713                  * since we did not send a HB make sure we don't double
 1714                  * things
 1715                  */
 1716                 net->hb_responded = 1;
 1717 
 1718                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
 1719                     init_offset + sizeof(struct sctp_init_chunk),
 1720                     initack_offset, sh, init_src)) {
 1721                         if (how_indx < sizeof(asoc->cookie_how))
 1722                                 asoc->cookie_how[how_indx] = 14;
 1723 
 1724                         return (NULL);
 1725                 }
 1726                 /* respond with a COOKIE-ACK */
 1727                 sctp_stop_all_cookie_timers(stcb);
 1728                 sctp_toss_old_cookies(stcb, asoc);
 1729                 sctp_send_cookie_ack(stcb);
 1730                 if (how_indx < sizeof(asoc->cookie_how))
 1731                         asoc->cookie_how[how_indx] = 15;
 1732 
 1733                 return (stcb);
 1734         }
 1735         if (how_indx < sizeof(asoc->cookie_how))
 1736                 asoc->cookie_how[how_indx] = 16;
 1737         /* all other cases... */
 1738         return (NULL);
 1739 }
 1740 
 1741 
 1742 /*
 1743  * handle a state cookie for a new association m: input packet mbuf chain--
 1744  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
 1745  * and the cookie signature does not exist offset: offset into mbuf to the
 1746  * cookie-echo chunk length: length of the cookie chunk to: where the init
 1747  * was from returns a new TCB
 1748  */
 1749 static struct sctp_tcb *
 1750 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 1751     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 1752     struct sctp_inpcb *inp, struct sctp_nets **netp,
 1753     struct sockaddr *init_src, int *notification,
 1754     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 1755     uint32_t vrf_id, uint16_t port)
 1756 {
 1757         struct sctp_tcb *stcb;
 1758         struct sctp_init_chunk *init_cp, init_buf;
 1759         struct sctp_init_ack_chunk *initack_cp, initack_buf;
 1760         struct sockaddr_storage sa_store;
 1761         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
 1762         struct sockaddr_in *sin;
 1763         struct sockaddr_in6 *sin6;
 1764         struct sctp_association *asoc;
 1765         int chk_length;
 1766         int init_offset, initack_offset, initack_limit;
 1767         int retval;
 1768         int error = 0;
 1769         uint32_t old_tag;
 1770         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
 1771 
 1772 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1773         struct socket *so;
 1774 
 1775         so = SCTP_INP_SO(inp);
 1776 #endif
 1777 
 1778         /*
 1779          * find and validate the INIT chunk in the cookie (peer's info) the
 1780          * INIT should start after the cookie-echo header struct (chunk
 1781          * header, state cookie header struct)
 1782          */
 1783         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
 1784         init_cp = (struct sctp_init_chunk *)
 1785             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
 1786             (uint8_t *) & init_buf);
 1787         if (init_cp == NULL) {
 1788                 /* could not pull a INIT chunk in cookie */
 1789                 SCTPDBG(SCTP_DEBUG_INPUT1,
 1790                     "process_cookie_new: could not pull INIT chunk hdr\n");
 1791                 return (NULL);
 1792         }
 1793         chk_length = ntohs(init_cp->ch.chunk_length);
 1794         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
 1795                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
 1796                 return (NULL);
 1797         }
 1798         initack_offset = init_offset + SCTP_SIZE32(chk_length);
 1799         /*
 1800          * find and validate the INIT-ACK chunk in the cookie (my info) the
 1801          * INIT-ACK follows the INIT chunk
 1802          */
 1803         initack_cp = (struct sctp_init_ack_chunk *)
 1804             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
 1805             (uint8_t *) & initack_buf);
 1806         if (initack_cp == NULL) {
 1807                 /* could not pull INIT-ACK chunk in cookie */
 1808                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
 1809                 return (NULL);
 1810         }
 1811         chk_length = ntohs(initack_cp->ch.chunk_length);
 1812         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
 1813                 return (NULL);
 1814         }
 1815         /*
 1816          * NOTE: We can't use the INIT_ACK's chk_length to determine the
 1817          * "initack_limit" value.  This is because the chk_length field
 1818          * includes the length of the cookie, but the cookie is omitted when
 1819          * the INIT and INIT_ACK are tacked onto the cookie...
 1820          */
 1821         initack_limit = offset + cookie_len;
 1822 
 1823         /*
 1824          * now that we know the INIT/INIT-ACK are in place, create a new TCB
 1825          * and popluate
 1826          */
 1827 
 1828         /*
 1829          * Here we do a trick, we set in NULL for the proc/thread argument.
 1830          * We do this since in effect we only use the p argument when the
 1831          * socket is unbound and we must do an implicit bind. Since we are
 1832          * getting a cookie, we cannot be unbound.
 1833          */
 1834         stcb = sctp_aloc_assoc(inp, init_src, 0, &error,
 1835             ntohl(initack_cp->init.initiate_tag), vrf_id,
 1836             (struct thread *)NULL
 1837             );
 1838         if (stcb == NULL) {
 1839                 struct mbuf *op_err;
 1840 
 1841                 /* memory problem? */
 1842                 SCTPDBG(SCTP_DEBUG_INPUT1,
 1843                     "process_cookie_new: no room for another TCB!\n");
 1844                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 1845 
 1846                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
 1847                     sh, op_err, vrf_id, port);
 1848                 return (NULL);
 1849         }
 1850         /* get the correct sctp_nets */
 1851         if (netp)
 1852                 *netp = sctp_findnet(stcb, init_src);
 1853 
 1854         asoc = &stcb->asoc;
 1855         /* get scope variables out of cookie */
 1856         asoc->ipv4_local_scope = cookie->ipv4_scope;
 1857         asoc->site_scope = cookie->site_scope;
 1858         asoc->local_scope = cookie->local_scope;
 1859         asoc->loopback_scope = cookie->loopback_scope;
 1860 
 1861         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
 1862             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
 1863                 struct mbuf *op_err;
 1864 
 1865                 /*
 1866                  * Houston we have a problem. The EP changed while the
 1867                  * cookie was in flight. Only recourse is to abort the
 1868                  * association.
 1869                  */
 1870                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1871                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 1872                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
 1873                     sh, op_err, vrf_id, port);
 1874 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1875                 SCTP_TCB_UNLOCK(stcb);
 1876                 SCTP_SOCKET_LOCK(so, 1);
 1877                 SCTP_TCB_LOCK(stcb);
 1878 #endif
 1879                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 1880                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
 1881 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1882                 SCTP_SOCKET_UNLOCK(so, 1);
 1883 #endif
 1884                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1885                 return (NULL);
 1886         }
 1887         /* process the INIT-ACK info (my info) */
 1888         old_tag = asoc->my_vtag;
 1889         asoc->assoc_id = asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
 1890         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 1891         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
 1892         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
 1893         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
 1894         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
 1895         asoc->last_cwr_tsn = asoc->init_seq_number - 1;
 1896         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
 1897         asoc->str_reset_seq_in = asoc->init_seq_number;
 1898 
 1899         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 1900 
 1901         /* process the INIT info (peer's info) */
 1902         if (netp)
 1903                 retval = sctp_process_init(init_cp, stcb, *netp);
 1904         else
 1905                 retval = 0;
 1906         if (retval < 0) {
 1907                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1908 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1909                 SCTP_TCB_UNLOCK(stcb);
 1910                 SCTP_SOCKET_LOCK(so, 1);
 1911                 SCTP_TCB_LOCK(stcb);
 1912 #endif
 1913                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
 1914 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1915                 SCTP_SOCKET_UNLOCK(so, 1);
 1916 #endif
 1917                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1918                 return (NULL);
 1919         }
 1920         /* load all addresses */
 1921         if (sctp_load_addresses_from_init(stcb, m, iphlen,
 1922             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
 1923             init_src)) {
 1924                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1925 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1926                 SCTP_TCB_UNLOCK(stcb);
 1927                 SCTP_SOCKET_LOCK(so, 1);
 1928                 SCTP_TCB_LOCK(stcb);
 1929 #endif
 1930                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
 1931 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1932                 SCTP_SOCKET_UNLOCK(so, 1);
 1933 #endif
 1934                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1935                 return (NULL);
 1936         }
 1937         /*
 1938          * verify any preceding AUTH chunk that was skipped
 1939          */
 1940         /* pull the local authentication parameters from the cookie/init-ack */
 1941         sctp_auth_get_cookie_params(stcb, m,
 1942             initack_offset + sizeof(struct sctp_init_ack_chunk),
 1943             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
 1944         if (auth_skipped) {
 1945                 struct sctp_auth_chunk *auth;
 1946 
 1947                 auth = (struct sctp_auth_chunk *)
 1948                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
 1949                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
 1950                         /* auth HMAC failed, dump the assoc and packet */
 1951                         SCTPDBG(SCTP_DEBUG_AUTH1,
 1952                             "COOKIE-ECHO: AUTH failed\n");
 1953                         atomic_add_int(&stcb->asoc.refcnt, 1);
 1954 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1955                         SCTP_TCB_UNLOCK(stcb);
 1956                         SCTP_SOCKET_LOCK(so, 1);
 1957                         SCTP_TCB_LOCK(stcb);
 1958 #endif
 1959                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
 1960 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1961                         SCTP_SOCKET_UNLOCK(so, 1);
 1962 #endif
 1963                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1964                         return (NULL);
 1965                 } else {
 1966                         /* remaining chunks checked... good to go */
 1967                         stcb->asoc.authenticated = 1;
 1968                 }
 1969         }
 1970         /* update current state */
 1971         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
 1972         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1973         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1974                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1975                     stcb->sctp_ep, stcb, asoc->primary_destination);
 1976         }
 1977         sctp_stop_all_cookie_timers(stcb);
 1978         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
 1979         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1980 
 1981         /*
 1982          * if we're doing ASCONFs, check to see if we have any new local
 1983          * addresses that need to get added to the peer (eg. addresses
 1984          * changed while cookie echo in flight).  This needs to be done
 1985          * after we go to the OPEN state to do the correct asconf
 1986          * processing. else, make sure we have the correct addresses in our
 1987          * lists
 1988          */
 1989 
 1990         /* warning, we re-use sin, sin6, sa_store here! */
 1991         /* pull in local_address (our "from" address) */
 1992         if (cookie->laddr_type == SCTP_IPV4_ADDRESS) {
 1993                 /* source addr is IPv4 */
 1994                 sin = (struct sockaddr_in *)initack_src;
 1995                 memset(sin, 0, sizeof(*sin));
 1996                 sin->sin_family = AF_INET;
 1997                 sin->sin_len = sizeof(struct sockaddr_in);
 1998                 sin->sin_addr.s_addr = cookie->laddress[0];
 1999         } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) {
 2000                 /* source addr is IPv6 */
 2001                 sin6 = (struct sockaddr_in6 *)initack_src;
 2002                 memset(sin6, 0, sizeof(*sin6));
 2003                 sin6->sin6_family = AF_INET6;
 2004                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 2005                 sin6->sin6_scope_id = cookie->scope_id;
 2006                 memcpy(&sin6->sin6_addr, cookie->laddress,
 2007                     sizeof(sin6->sin6_addr));
 2008         } else {
 2009                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2010 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2011                 SCTP_TCB_UNLOCK(stcb);
 2012                 SCTP_SOCKET_LOCK(so, 1);
 2013                 SCTP_TCB_LOCK(stcb);
 2014 #endif
 2015                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
 2016 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2017                 SCTP_SOCKET_UNLOCK(so, 1);
 2018 #endif
 2019                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2020                 return (NULL);
 2021         }
 2022 
 2023         /* set up to notify upper layer */
 2024         *notification = SCTP_NOTIFY_ASSOC_UP;
 2025         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 2026             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 2027             (inp->sctp_socket->so_qlimit == 0)) {
 2028                 /*
 2029                  * This is an endpoint that called connect() how it got a
 2030                  * cookie that is NEW is a bit of a mystery. It must be that
 2031                  * the INIT was sent, but before it got there.. a complete
 2032                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
 2033                  * should have went to the other code.. not here.. oh well..
 2034                  * a bit of protection is worth having..
 2035                  */
 2036                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 2037 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2038                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2039                 SCTP_TCB_UNLOCK(stcb);
 2040                 SCTP_SOCKET_LOCK(so, 1);
 2041                 SCTP_TCB_LOCK(stcb);
 2042                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2043                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 2044                         SCTP_SOCKET_UNLOCK(so, 1);
 2045                         return (NULL);
 2046                 }
 2047 #endif
 2048                 soisconnected(stcb->sctp_socket);
 2049 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2050                 SCTP_SOCKET_UNLOCK(so, 1);
 2051 #endif
 2052         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 2053             (inp->sctp_socket->so_qlimit)) {
 2054                 /*
 2055                  * We don't want to do anything with this one. Since it is
 2056                  * the listening guy. The timer will get started for
 2057                  * accepted connections in the caller.
 2058                  */
 2059                 ;
 2060         }
 2061         /* since we did not send a HB make sure we don't double things */
 2062         if ((netp) && (*netp))
 2063                 (*netp)->hb_responded = 1;
 2064 
 2065         if (stcb->asoc.sctp_autoclose_ticks &&
 2066             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 2067                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
 2068         }
 2069         /* calculate the RTT */
 2070         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 2071         if ((netp) && (*netp)) {
 2072                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
 2073                     &cookie->time_entered, sctp_align_unsafe_makecopy);
 2074         }
 2075         /* respond with a COOKIE-ACK */
 2076         sctp_send_cookie_ack(stcb);
 2077 
 2078         /*
 2079          * check the address lists for any ASCONFs that need to be sent
 2080          * AFTER the cookie-ack is sent
 2081          */
 2082         sctp_check_address_list(stcb, m,
 2083             initack_offset + sizeof(struct sctp_init_ack_chunk),
 2084             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
 2085             initack_src, cookie->local_scope, cookie->site_scope,
 2086             cookie->ipv4_scope, cookie->loopback_scope);
 2087 
 2088 
 2089         return (stcb);
 2090 }
 2091 
 2092 
 2093 /*
 2094  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
 2095  * existing (non-NULL) TCB
 2096  */
 2097 static struct mbuf *
 2098 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
 2099     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
 2100     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
 2101     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 2102     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
 2103 {
 2104         struct sctp_state_cookie *cookie;
 2105         struct sockaddr_in6 sin6;
 2106         struct sockaddr_in sin;
 2107         struct sctp_tcb *l_stcb = *stcb;
 2108         struct sctp_inpcb *l_inp;
 2109         struct sockaddr *to;
 2110         sctp_assoc_t sac_restart_id;
 2111         struct sctp_pcb *ep;
 2112         struct mbuf *m_sig;
 2113         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
 2114         uint8_t *sig;
 2115         uint8_t cookie_ok = 0;
 2116         unsigned int size_of_pkt, sig_offset, cookie_offset;
 2117         unsigned int cookie_len;
 2118         struct timeval now;
 2119         struct timeval time_expires;
 2120         struct sockaddr_storage dest_store;
 2121         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
 2122         struct ip *iph;
 2123         int notification = 0;
 2124         struct sctp_nets *netl;
 2125         int had_a_existing_tcb = 0;
 2126 
 2127         SCTPDBG(SCTP_DEBUG_INPUT2,
 2128             "sctp_handle_cookie: handling COOKIE-ECHO\n");
 2129 
 2130         if (inp_p == NULL) {
 2131                 return (NULL);
 2132         }
 2133         /* First get the destination address setup too. */
 2134         iph = mtod(m, struct ip *);
 2135         switch (iph->ip_v) {
 2136         case IPVERSION:
 2137                 {
 2138                         /* its IPv4 */
 2139                         struct sockaddr_in *lsin;
 2140 
 2141                         lsin = (struct sockaddr_in *)(localep_sa);
 2142                         memset(lsin, 0, sizeof(*lsin));
 2143                         lsin->sin_family = AF_INET;
 2144                         lsin->sin_len = sizeof(*lsin);
 2145                         lsin->sin_port = sh->dest_port;
 2146                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
 2147                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
 2148                         break;
 2149                 }
 2150 #ifdef INET6
 2151         case IPV6_VERSION >> 4:
 2152                 {
 2153                         /* its IPv6 */
 2154                         struct ip6_hdr *ip6;
 2155                         struct sockaddr_in6 *lsin6;
 2156 
 2157                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
 2158                         memset(lsin6, 0, sizeof(*lsin6));
 2159                         lsin6->sin6_family = AF_INET6;
 2160                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
 2161                         ip6 = mtod(m, struct ip6_hdr *);
 2162                         lsin6->sin6_port = sh->dest_port;
 2163                         lsin6->sin6_addr = ip6->ip6_dst;
 2164                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
 2165                         break;
 2166                 }
 2167 #endif
 2168         default:
 2169                 return (NULL);
 2170         }
 2171 
 2172         cookie = &cp->cookie;
 2173         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
 2174         cookie_len = ntohs(cp->ch.chunk_length);
 2175 
 2176         if ((cookie->peerport != sh->src_port) &&
 2177             (cookie->myport != sh->dest_port) &&
 2178             (cookie->my_vtag != sh->v_tag)) {
 2179                 /*
 2180                  * invalid ports or bad tag.  Note that we always leave the
 2181                  * v_tag in the header in network order and when we stored
 2182                  * it in the my_vtag slot we also left it in network order.
 2183                  * This maintains the match even though it may be in the
 2184                  * opposite byte order of the machine :->
 2185                  */
 2186                 return (NULL);
 2187         }
 2188         if (cookie_len > size_of_pkt ||
 2189             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
 2190             sizeof(struct sctp_init_chunk) +
 2191             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
 2192                 /* cookie too long!  or too small */
 2193                 return (NULL);
 2194         }
 2195         /*
 2196          * split off the signature into its own mbuf (since it should not be
 2197          * calculated in the sctp_hmac_m() call).
 2198          */
 2199         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
 2200         if (sig_offset > size_of_pkt) {
 2201                 /* packet not correct size! */
 2202                 /* XXX this may already be accounted for earlier... */
 2203                 return (NULL);
 2204         }
 2205         m_sig = m_split(m, sig_offset, M_DONTWAIT);
 2206         if (m_sig == NULL) {
 2207                 /* out of memory or ?? */
 2208                 return (NULL);
 2209         }
 2210 #ifdef SCTP_MBUF_LOGGING
 2211         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 2212                 struct mbuf *mat;
 2213 
 2214                 mat = m_sig;
 2215                 while (mat) {
 2216                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 2217                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
 2218                         }
 2219                         mat = SCTP_BUF_NEXT(mat);
 2220                 }
 2221         }
 2222 #endif
 2223 
 2224         /*
 2225          * compute the signature/digest for the cookie
 2226          */
 2227         ep = &(*inp_p)->sctp_ep;
 2228         l_inp = *inp_p;
 2229         if (l_stcb) {
 2230                 SCTP_TCB_UNLOCK(l_stcb);
 2231         }
 2232         SCTP_INP_RLOCK(l_inp);
 2233         if (l_stcb) {
 2234                 SCTP_TCB_LOCK(l_stcb);
 2235         }
 2236         /* which cookie is it? */
 2237         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
 2238             (ep->current_secret_number != ep->last_secret_number)) {
 2239                 /* it's the old cookie */
 2240                 (void)sctp_hmac_m(SCTP_HMAC,
 2241                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
 2242                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2243         } else {
 2244                 /* it's the current cookie */
 2245                 (void)sctp_hmac_m(SCTP_HMAC,
 2246                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
 2247                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2248         }
 2249         /* get the signature */
 2250         SCTP_INP_RUNLOCK(l_inp);
 2251         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
 2252         if (sig == NULL) {
 2253                 /* couldn't find signature */
 2254                 sctp_m_freem(m_sig);
 2255                 return (NULL);
 2256         }
 2257         /* compare the received digest with the computed digest */
 2258         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
 2259                 /* try the old cookie? */
 2260                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
 2261                     (ep->current_secret_number != ep->last_secret_number)) {
 2262                         /* compute digest with old */
 2263                         (void)sctp_hmac_m(SCTP_HMAC,
 2264                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
 2265                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2266                         /* compare */
 2267                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
 2268                                 cookie_ok = 1;
 2269                 }
 2270         } else {
 2271                 cookie_ok = 1;
 2272         }
 2273 
 2274         /*
 2275          * Now before we continue we must reconstruct our mbuf so that
 2276          * normal processing of any other chunks will work.
 2277          */
 2278         {
 2279                 struct mbuf *m_at;
 2280 
 2281                 m_at = m;
 2282                 while (SCTP_BUF_NEXT(m_at) != NULL) {
 2283                         m_at = SCTP_BUF_NEXT(m_at);
 2284                 }
 2285                 SCTP_BUF_NEXT(m_at) = m_sig;
 2286         }
 2287 
 2288         if (cookie_ok == 0) {
 2289                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
 2290                 SCTPDBG(SCTP_DEBUG_INPUT2,
 2291                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
 2292                     (uint32_t) offset, cookie_offset, sig_offset);
 2293                 return (NULL);
 2294         }
 2295         /*
 2296          * check the cookie timestamps to be sure it's not stale
 2297          */
 2298         (void)SCTP_GETTIME_TIMEVAL(&now);
 2299         /* Expire time is in Ticks, so we convert to seconds */
 2300         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
 2301         time_expires.tv_usec = cookie->time_entered.tv_usec;
 2302         /*
 2303          * TODO sctp_constants.h needs alternative time macros when _KERNEL
 2304          * is undefined.
 2305          */
 2306         if (timevalcmp(&now, &time_expires, >)) {
 2307                 /* cookie is stale! */
 2308                 struct mbuf *op_err;
 2309                 struct sctp_stale_cookie_msg *scm;
 2310                 uint32_t tim;
 2311 
 2312                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
 2313                     0, M_DONTWAIT, 1, MT_DATA);
 2314                 if (op_err == NULL) {
 2315                         /* FOOBAR */
 2316                         return (NULL);
 2317                 }
 2318                 /* pre-reserve some space */
 2319 #ifdef INET6
 2320                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 2321 #else
 2322                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 2323 #endif
 2324                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 2325                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 2326 
 2327                 /* Set the len */
 2328                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
 2329                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
 2330                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
 2331                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
 2332                     (sizeof(uint32_t))));
 2333                 /* seconds to usec */
 2334                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
 2335                 /* add in usec */
 2336                 if (tim == 0)
 2337                         tim = now.tv_usec - cookie->time_entered.tv_usec;
 2338                 scm->time_usec = htonl(tim);
 2339                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
 2340                     vrf_id, port);
 2341                 return (NULL);
 2342         }
 2343         /*
 2344          * Now we must see with the lookup address if we have an existing
 2345          * asoc. This will only happen if we were in the COOKIE-WAIT state
 2346          * and a INIT collided with us and somewhere the peer sent the
 2347          * cookie on another address besides the single address our assoc
 2348          * had for him. In this case we will have one of the tie-tags set at
 2349          * least AND the address field in the cookie can be used to look it
 2350          * up.
 2351          */
 2352         to = NULL;
 2353         if (cookie->addr_type == SCTP_IPV6_ADDRESS) {
 2354                 memset(&sin6, 0, sizeof(sin6));
 2355                 sin6.sin6_family = AF_INET6;
 2356                 sin6.sin6_len = sizeof(sin6);
 2357                 sin6.sin6_port = sh->src_port;
 2358                 sin6.sin6_scope_id = cookie->scope_id;
 2359                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
 2360                     sizeof(sin6.sin6_addr.s6_addr));
 2361                 to = (struct sockaddr *)&sin6;
 2362         } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) {
 2363                 memset(&sin, 0, sizeof(sin));
 2364                 sin.sin_family = AF_INET;
 2365                 sin.sin_len = sizeof(sin);
 2366                 sin.sin_port = sh->src_port;
 2367                 sin.sin_addr.s_addr = cookie->address[0];
 2368                 to = (struct sockaddr *)&sin;
 2369         } else {
 2370                 /* This should not happen */
 2371                 return (NULL);
 2372         }
 2373         if ((*stcb == NULL) && to) {
 2374                 /* Yep, lets check */
 2375                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
 2376                 if (*stcb == NULL) {
 2377                         /*
 2378                          * We should have only got back the same inp. If we
 2379                          * got back a different ep we have a problem. The
 2380                          * original findep got back l_inp and now
 2381                          */
 2382                         if (l_inp != *inp_p) {
 2383                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
 2384                         }
 2385                 } else {
 2386                         if (*locked_tcb == NULL) {
 2387                                 /*
 2388                                  * In this case we found the assoc only
 2389                                  * after we locked the create lock. This
 2390                                  * means we are in a colliding case and we
 2391                                  * must make sure that we unlock the tcb if
 2392                                  * its one of the cases where we throw away
 2393                                  * the incoming packets.
 2394                                  */
 2395                                 *locked_tcb = *stcb;
 2396 
 2397                                 /*
 2398                                  * We must also increment the inp ref count
 2399                                  * since the ref_count flags was set when we
 2400                                  * did not find the TCB, now we found it
 2401                                  * which reduces the refcount.. we must
 2402                                  * raise it back out to balance it all :-)
 2403                                  */
 2404                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
 2405                                 if ((*stcb)->sctp_ep != l_inp) {
 2406                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
 2407                                             (*stcb)->sctp_ep, l_inp);
 2408                                 }
 2409                         }
 2410                 }
 2411         }
 2412         if (to == NULL)
 2413                 return (NULL);
 2414 
 2415         cookie_len -= SCTP_SIGNATURE_SIZE;
 2416         if (*stcb == NULL) {
 2417                 /* this is the "normal" case... get a new TCB */
 2418                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
 2419                     cookie_len, *inp_p, netp, to, &notification,
 2420                     auth_skipped, auth_offset, auth_len, vrf_id, port);
 2421         } else {
 2422                 /* this is abnormal... cookie-echo on existing TCB */
 2423                 had_a_existing_tcb = 1;
 2424                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
 2425                     cookie, cookie_len, *inp_p, *stcb, *netp, to,
 2426                     &notification, &sac_restart_id, vrf_id);
 2427         }
 2428 
 2429         if (*stcb == NULL) {
 2430                 /* still no TCB... must be bad cookie-echo */
 2431                 return (NULL);
 2432         }
 2433         /*
 2434          * Ok, we built an association so confirm the address we sent the
 2435          * INIT-ACK to.
 2436          */
 2437         netl = sctp_findnet(*stcb, to);
 2438         /*
 2439          * This code should in theory NOT run but
 2440          */
 2441         if (netl == NULL) {
 2442                 /* TSNH! Huh, why do I need to add this address here? */
 2443                 int ret;
 2444 
 2445                 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE,
 2446                     SCTP_IN_COOKIE_PROC);
 2447                 netl = sctp_findnet(*stcb, to);
 2448         }
 2449         if (netl) {
 2450                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
 2451                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 2452                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
 2453                             netl);
 2454                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2455                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2456                 }
 2457         }
 2458         if (*stcb) {
 2459                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p,
 2460                     *stcb, NULL);
 2461         }
 2462         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 2463                 if (!had_a_existing_tcb ||
 2464                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 2465                         /*
 2466                          * If we have a NEW cookie or the connect never
 2467                          * reached the connected state during collision we
 2468                          * must do the TCP accept thing.
 2469                          */
 2470                         struct socket *so, *oso;
 2471                         struct sctp_inpcb *inp;
 2472 
 2473                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
 2474                                 /*
 2475                                  * For a restart we will keep the same
 2476                                  * socket, no need to do anything. I THINK!!
 2477                                  */
 2478                                 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED);
 2479                                 return (m);
 2480                         }
 2481                         oso = (*inp_p)->sctp_socket;
 2482                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2483                         SCTP_TCB_UNLOCK((*stcb));
 2484                         so = sonewconn(oso, 0
 2485                             );
 2486                         SCTP_TCB_LOCK((*stcb));
 2487                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2488 
 2489                         if (so == NULL) {
 2490                                 struct mbuf *op_err;
 2491 
 2492 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2493                                 struct socket *pcb_so;
 2494 
 2495 #endif
 2496                                 /* Too many sockets */
 2497                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
 2498                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 2499                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
 2500                                     sh, op_err, vrf_id, port);
 2501 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2502                                 pcb_so = SCTP_INP_SO(*inp_p);
 2503                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2504                                 SCTP_TCB_UNLOCK((*stcb));
 2505                                 SCTP_SOCKET_LOCK(pcb_so, 1);
 2506                                 SCTP_TCB_LOCK((*stcb));
 2507                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2508 #endif
 2509                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
 2510 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2511                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
 2512 #endif
 2513                                 return (NULL);
 2514                         }
 2515                         inp = (struct sctp_inpcb *)so->so_pcb;
 2516                         SCTP_INP_INCR_REF(inp);
 2517                         /*
 2518                          * We add the unbound flag here so that if we get an
 2519                          * soabort() before we get the move_pcb done, we
 2520                          * will properly cleanup.
 2521                          */
 2522                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
 2523                             SCTP_PCB_FLAGS_CONNECTED |
 2524                             SCTP_PCB_FLAGS_IN_TCPPOOL |
 2525                             SCTP_PCB_FLAGS_UNBOUND |
 2526                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
 2527                             SCTP_PCB_FLAGS_DONT_WAKE);
 2528                         inp->sctp_features = (*inp_p)->sctp_features;
 2529                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
 2530                         inp->sctp_socket = so;
 2531                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
 2532                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
 2533                         inp->sctp_context = (*inp_p)->sctp_context;
 2534                         inp->inp_starting_point_for_iterator = NULL;
 2535                         /*
 2536                          * copy in the authentication parameters from the
 2537                          * original endpoint
 2538                          */
 2539                         if (inp->sctp_ep.local_hmacs)
 2540                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
 2541                         inp->sctp_ep.local_hmacs =
 2542                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
 2543                         if (inp->sctp_ep.local_auth_chunks)
 2544                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
 2545                         inp->sctp_ep.local_auth_chunks =
 2546                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
 2547                         (void)sctp_copy_skeylist(&(*inp_p)->sctp_ep.shared_keys,
 2548                             &inp->sctp_ep.shared_keys);
 2549 
 2550                         /*
 2551                          * Now we must move it from one hash table to
 2552                          * another and get the tcb in the right place.
 2553                          */
 2554                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
 2555 
 2556                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2557                         SCTP_TCB_UNLOCK((*stcb));
 2558 
 2559                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
 2560                             0);
 2561                         SCTP_TCB_LOCK((*stcb));
 2562                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2563 
 2564 
 2565                         /*
 2566                          * now we must check to see if we were aborted while
 2567                          * the move was going on and the lock/unlock
 2568                          * happened.
 2569                          */
 2570                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 2571                                 /*
 2572                                  * yep it was, we leave the assoc attached
 2573                                  * to the socket since the sctp_inpcb_free()
 2574                                  * call will send an abort for us.
 2575                                  */
 2576                                 SCTP_INP_DECR_REF(inp);
 2577                                 return (NULL);
 2578                         }
 2579                         SCTP_INP_DECR_REF(inp);
 2580                         /* Switch over to the new guy */
 2581                         *inp_p = inp;
 2582                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2583 
 2584                         /*
 2585                          * Pull it from the incomplete queue and wake the
 2586                          * guy
 2587                          */
 2588 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2589                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2590                         SCTP_TCB_UNLOCK((*stcb));
 2591                         SCTP_SOCKET_LOCK(so, 1);
 2592 #endif
 2593                         soisconnected(so);
 2594 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2595                         SCTP_TCB_LOCK((*stcb));
 2596                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2597                         SCTP_SOCKET_UNLOCK(so, 1);
 2598 #endif
 2599                         return (m);
 2600                 }
 2601         }
 2602         if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
 2603                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2604         }
 2605         return (m);
 2606 }
 2607 
 2608 static void
 2609 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
 2610     struct sctp_tcb *stcb, struct sctp_nets *net)
 2611 {
 2612         /* cp must not be used, others call this without a c-ack :-) */
 2613         struct sctp_association *asoc;
 2614 
 2615         SCTPDBG(SCTP_DEBUG_INPUT2,
 2616             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
 2617         if (stcb == NULL)
 2618                 return;
 2619 
 2620         asoc = &stcb->asoc;
 2621 
 2622         sctp_stop_all_cookie_timers(stcb);
 2623         /* process according to association state */
 2624         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
 2625                 /* state change only needed when I am in right state */
 2626                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
 2627                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 2628                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 2629                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 2630                             stcb->sctp_ep, stcb, asoc->primary_destination);
 2631 
 2632                 }
 2633                 /* update RTO */
 2634                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 2635                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 2636                 if (asoc->overall_error_count == 0) {
 2637                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
 2638                             &asoc->time_entered, sctp_align_safe_nocopy);
 2639                 }
 2640                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 2641                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2642                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 2643                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 2644 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2645                         struct socket *so;
 2646 
 2647 #endif
 2648                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 2649 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2650                         so = SCTP_INP_SO(stcb->sctp_ep);
 2651                         atomic_add_int(&stcb->asoc.refcnt, 1);
 2652                         SCTP_TCB_UNLOCK(stcb);
 2653                         SCTP_SOCKET_LOCK(so, 1);
 2654                         SCTP_TCB_LOCK(stcb);
 2655                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2656                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 2657                                 SCTP_SOCKET_UNLOCK(so, 1);
 2658                                 return;
 2659                         }
 2660 #endif
 2661                         soisconnected(stcb->sctp_socket);
 2662 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2663                         SCTP_SOCKET_UNLOCK(so, 1);
 2664 #endif
 2665                 }
 2666                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 2667                     stcb, net);
 2668                 /*
 2669                  * since we did not send a HB make sure we don't double
 2670                  * things
 2671                  */
 2672                 net->hb_responded = 1;
 2673 
 2674                 if (stcb->asoc.sctp_autoclose_ticks &&
 2675                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 2676                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
 2677                             stcb->sctp_ep, stcb, NULL);
 2678                 }
 2679                 /*
 2680                  * send ASCONF if parameters are pending and ASCONFs are
 2681                  * allowed (eg. addresses changed when init/cookie echo were
 2682                  * in flight)
 2683                  */
 2684                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
 2685                     (stcb->asoc.peer_supports_asconf) &&
 2686                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
 2687 #ifdef SCTP_TIMER_BASED_ASCONF
 2688                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
 2689                             stcb->sctp_ep, stcb,
 2690                             stcb->asoc.primary_destination);
 2691 #else
 2692                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
 2693                             SCTP_ADDR_NOT_LOCKED);
 2694 #endif
 2695                 }
 2696         }
 2697         /* Toss the cookie if I can */
 2698         sctp_toss_old_cookies(stcb, asoc);
 2699         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
 2700                 /* Restart the timer if we have pending data */
 2701                 struct sctp_tmit_chunk *chk;
 2702 
 2703                 chk = TAILQ_FIRST(&asoc->sent_queue);
 2704                 if (chk) {
 2705                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 2706                             stcb, chk->whoTo);
 2707                 }
 2708         }
 2709 }
 2710 
 2711 static void
 2712 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
 2713     struct sctp_tcb *stcb)
 2714 {
 2715         struct sctp_nets *net;
 2716         struct sctp_tmit_chunk *lchk;
 2717         uint32_t tsn;
 2718 
 2719         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) {
 2720                 return;
 2721         }
 2722         SCTP_STAT_INCR(sctps_recvecne);
 2723         tsn = ntohl(cp->tsn);
 2724         /* ECN Nonce stuff: need a resync and disable the nonce sum check */
 2725         /* Also we make sure we disable the nonce_wait */
 2726         lchk = TAILQ_FIRST(&stcb->asoc.send_queue);
 2727         if (lchk == NULL) {
 2728                 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq;
 2729         } else {
 2730                 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq;
 2731         }
 2732         stcb->asoc.nonce_wait_for_ecne = 0;
 2733         stcb->asoc.nonce_sum_check = 0;
 2734 
 2735         /* Find where it was sent, if possible */
 2736         net = NULL;
 2737         lchk = TAILQ_FIRST(&stcb->asoc.sent_queue);
 2738         while (lchk) {
 2739                 if (lchk->rec.data.TSN_seq == tsn) {
 2740                         net = lchk->whoTo;
 2741                         break;
 2742                 }
 2743                 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ))
 2744                         break;
 2745                 lchk = TAILQ_NEXT(lchk, sctp_next);
 2746         }
 2747         if (net == NULL)
 2748                 /* default is we use the primary */
 2749                 net = stcb->asoc.primary_destination;
 2750 
 2751         if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) {
 2752                 /*
 2753                  * JRS - Use the congestion control given in the pluggable
 2754                  * CC module
 2755                  */
 2756                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net);
 2757                 /*
 2758                  * we reduce once every RTT. So we will only lower cwnd at
 2759                  * the next sending seq i.e. the resync_tsn.
 2760                  */
 2761                 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn;
 2762         }
 2763         /*
 2764          * We always send a CWR this way if our previous one was lost our
 2765          * peer will get an update, or if it is not time again to reduce we
 2766          * still get the cwr to the peer.
 2767          */
 2768         sctp_send_cwr(stcb, net, tsn);
 2769 }
 2770 
 2771 static void
 2772 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb)
 2773 {
 2774         /*
 2775          * Here we get a CWR from the peer. We must look in the outqueue and
 2776          * make sure that we have a covered ECNE in teh control chunk part.
 2777          * If so remove it.
 2778          */
 2779         struct sctp_tmit_chunk *chk;
 2780         struct sctp_ecne_chunk *ecne;
 2781 
 2782         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 2783                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
 2784                         continue;
 2785                 }
 2786                 /*
 2787                  * Look for and remove if it is the right TSN. Since there
 2788                  * is only ONE ECNE on the control queue at any one time we
 2789                  * don't need to worry about more than one!
 2790                  */
 2791                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
 2792                 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn),
 2793                     MAX_TSN) || (cp->tsn == ecne->tsn)) {
 2794                         /* this covers this ECNE, we can remove it */
 2795                         stcb->asoc.ecn_echo_cnt_onq--;
 2796                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
 2797                             sctp_next);
 2798                         if (chk->data) {
 2799                                 sctp_m_freem(chk->data);
 2800                                 chk->data = NULL;
 2801                         }
 2802                         stcb->asoc.ctrl_queue_cnt--;
 2803                         sctp_free_a_chunk(stcb, chk);
 2804                         break;
 2805                 }
 2806         }
 2807 }
 2808 
 2809 static void
 2810 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
 2811     struct sctp_tcb *stcb, struct sctp_nets *net)
 2812 {
 2813         struct sctp_association *asoc;
 2814 
 2815 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2816         struct socket *so;
 2817 
 2818 #endif
 2819 
 2820         SCTPDBG(SCTP_DEBUG_INPUT2,
 2821             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
 2822         if (stcb == NULL)
 2823                 return;
 2824 
 2825         asoc = &stcb->asoc;
 2826         /* process according to association state */
 2827         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 2828                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
 2829                 SCTPDBG(SCTP_DEBUG_INPUT2,
 2830                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
 2831                 SCTP_TCB_UNLOCK(stcb);
 2832                 return;
 2833         }
 2834         /* notify upper layer protocol */
 2835         if (stcb->sctp_socket) {
 2836                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2837                 /* are the queues empty? they should be */
 2838                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
 2839                     !TAILQ_EMPTY(&asoc->sent_queue) ||
 2840                     !TAILQ_EMPTY(&asoc->out_wheel)) {
 2841                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
 2842                 }
 2843         }
 2844         /* stop the timer */
 2845         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
 2846         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 2847         /* free the TCB */
 2848         SCTPDBG(SCTP_DEBUG_INPUT2,
 2849             "sctp_handle_shutdown_complete: calls free-asoc\n");
 2850 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2851         so = SCTP_INP_SO(stcb->sctp_ep);
 2852         atomic_add_int(&stcb->asoc.refcnt, 1);
 2853         SCTP_TCB_UNLOCK(stcb);
 2854         SCTP_SOCKET_LOCK(so, 1);
 2855         SCTP_TCB_LOCK(stcb);
 2856         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2857 #endif
 2858         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
 2859 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2860         SCTP_SOCKET_UNLOCK(so, 1);
 2861 #endif
 2862         return;
 2863 }
 2864 
 2865 static int
 2866 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
 2867     struct sctp_nets *net, uint8_t flg)
 2868 {
 2869         switch (desc->chunk_type) {
 2870                 case SCTP_DATA:
 2871                 /* find the tsn to resend (possibly */
 2872                 {
 2873                         uint32_t tsn;
 2874                         struct sctp_tmit_chunk *tp1;
 2875 
 2876                         tsn = ntohl(desc->tsn_ifany);
 2877                         tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
 2878                         while (tp1) {
 2879                                 if (tp1->rec.data.TSN_seq == tsn) {
 2880                                         /* found it */
 2881                                         break;
 2882                                 }
 2883                                 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn,
 2884                                     MAX_TSN)) {
 2885                                         /* not found */
 2886                                         tp1 = NULL;
 2887                                         break;
 2888                                 }
 2889                                 tp1 = TAILQ_NEXT(tp1, sctp_next);
 2890                         }
 2891                         if (tp1 == NULL) {
 2892                                 /*
 2893                                  * Do it the other way , aka without paying
 2894                                  * attention to queue seq order.
 2895                                  */
 2896                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
 2897                                 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
 2898                                 while (tp1) {
 2899                                         if (tp1->rec.data.TSN_seq == tsn) {
 2900                                                 /* found it */
 2901                                                 break;
 2902                                         }
 2903                                         tp1 = TAILQ_NEXT(tp1, sctp_next);
 2904                                 }
 2905                         }
 2906                         if (tp1 == NULL) {
 2907                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
 2908                         }
 2909                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
 2910                                 uint8_t *ddp;
 2911 
 2912                                 if ((stcb->asoc.peers_rwnd == 0) &&
 2913                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
 2914                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
 2915                                         return (0);
 2916                                 }
 2917                                 if (stcb->asoc.peers_rwnd == 0 &&
 2918                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
 2919                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
 2920                                         return (0);
 2921                                 }
 2922                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
 2923                                     sizeof(struct sctp_data_chunk));
 2924                                 {
 2925                                         unsigned int iii;
 2926 
 2927                                         for (iii = 0; iii < sizeof(desc->data_bytes);
 2928                                             iii++) {
 2929                                                 if (ddp[iii] != desc->data_bytes[iii]) {
 2930                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
 2931                                                         return (-1);
 2932                                                 }
 2933                                         }
 2934                                 }
 2935                                 /*
 2936                                  * We zero out the nonce so resync not
 2937                                  * needed
 2938                                  */
 2939                                 tp1->rec.data.ect_nonce = 0;
 2940 
 2941                                 if (tp1->do_rtt) {
 2942                                         /*
 2943                                          * this guy had a RTO calculation
 2944                                          * pending on it, cancel it
 2945                                          */
 2946                                         tp1->do_rtt = 0;
 2947                                 }
 2948                                 SCTP_STAT_INCR(sctps_pdrpmark);
 2949                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
 2950                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 2951                                 tp1->sent = SCTP_DATAGRAM_RESEND;
 2952                                 /*
 2953                                  * mark it as if we were doing a FR, since
 2954                                  * we will be getting gap ack reports behind
 2955                                  * the info from the router.
 2956                                  */
 2957                                 tp1->rec.data.doing_fast_retransmit = 1;
 2958                                 /*
 2959                                  * mark the tsn with what sequences can
 2960                                  * cause a new FR.
 2961                                  */
 2962                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 2963                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 2964                                 } else {
 2965                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
 2966                                 }
 2967 
 2968                                 /* restart the timer */
 2969                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 2970                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
 2971                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 2972                                     stcb, tp1->whoTo);
 2973 
 2974                                 /* fix counts and things */
 2975                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 2976                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
 2977                                             tp1->whoTo->flight_size,
 2978                                             tp1->book_size,
 2979                                             (uintptr_t) stcb,
 2980                                             tp1->rec.data.TSN_seq);
 2981                                 }
 2982                                 sctp_flight_size_decrease(tp1);
 2983                                 sctp_total_flight_decrease(stcb, tp1);
 2984                         } {
 2985                                 /* audit code */
 2986                                 unsigned int audit;
 2987 
 2988                                 audit = 0;
 2989                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 2990                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
 2991                                                 audit++;
 2992                                 }
 2993                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
 2994                                     sctp_next) {
 2995                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
 2996                                                 audit++;
 2997                                 }
 2998                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
 2999                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
 3000                                             audit, stcb->asoc.sent_queue_retran_cnt);
 3001 #ifndef SCTP_AUDITING_ENABLED
 3002                                         stcb->asoc.sent_queue_retran_cnt = audit;
 3003 #endif
 3004                                 }
 3005                         }
 3006                 }
 3007                 break;
 3008         case SCTP_ASCONF:
 3009                 {
 3010                         struct sctp_tmit_chunk *asconf;
 3011 
 3012                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
 3013                             sctp_next) {
 3014                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
 3015                                         break;
 3016                                 }
 3017                         }
 3018                         if (asconf) {
 3019                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 3020                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3021                                 asconf->sent = SCTP_DATAGRAM_RESEND;
 3022                                 asconf->snd_count--;
 3023                         }
 3024                 }
 3025                 break;
 3026         case SCTP_INITIATION:
 3027                 /* resend the INIT */
 3028                 stcb->asoc.dropped_special_cnt++;
 3029                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
 3030                         /*
 3031                          * If we can get it in, in a few attempts we do
 3032                          * this, otherwise we let the timer fire.
 3033                          */
 3034                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
 3035                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
 3036                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 3037                 }
 3038                 break;
 3039         case SCTP_SELECTIVE_ACK:
 3040                 /* resend the sack */
 3041                 sctp_send_sack(stcb);
 3042                 break;
 3043         case SCTP_HEARTBEAT_REQUEST:
 3044                 /* resend a demand HB */
 3045                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
 3046                         /*
 3047                          * Only retransmit if we KNOW we wont destroy the
 3048                          * tcb
 3049                          */
 3050                         (void)sctp_send_hb(stcb, 1, net);
 3051                 }
 3052                 break;
 3053         case SCTP_SHUTDOWN:
 3054                 sctp_send_shutdown(stcb, net);
 3055                 break;
 3056         case SCTP_SHUTDOWN_ACK:
 3057                 sctp_send_shutdown_ack(stcb, net);
 3058                 break;
 3059         case SCTP_COOKIE_ECHO:
 3060                 {
 3061                         struct sctp_tmit_chunk *cookie;
 3062 
 3063                         cookie = NULL;
 3064                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
 3065                             sctp_next) {
 3066                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 3067                                         break;
 3068                                 }
 3069                         }
 3070                         if (cookie) {
 3071                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
 3072                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3073                                 cookie->sent = SCTP_DATAGRAM_RESEND;
 3074                                 sctp_stop_all_cookie_timers(stcb);
 3075                         }
 3076                 }
 3077                 break;
 3078         case SCTP_COOKIE_ACK:
 3079                 sctp_send_cookie_ack(stcb);
 3080                 break;
 3081         case SCTP_ASCONF_ACK:
 3082                 /* resend last asconf ack */
 3083                 sctp_send_asconf_ack(stcb);
 3084                 break;
 3085         case SCTP_FORWARD_CUM_TSN:
 3086                 send_forward_tsn(stcb, &stcb->asoc);
 3087                 break;
 3088                 /* can't do anything with these */
 3089         case SCTP_PACKET_DROPPED:
 3090         case SCTP_INITIATION_ACK:       /* this should not happen */
 3091         case SCTP_HEARTBEAT_ACK:
 3092         case SCTP_ABORT_ASSOCIATION:
 3093         case SCTP_OPERATION_ERROR:
 3094         case SCTP_SHUTDOWN_COMPLETE:
 3095         case SCTP_ECN_ECHO:
 3096         case SCTP_ECN_CWR:
 3097         default:
 3098                 break;
 3099         }
 3100         return (0);
 3101 }
 3102 
 3103 void
 3104 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
 3105 {
 3106         int i;
 3107         uint16_t temp;
 3108 
 3109         /*
 3110          * We set things to 0xffff since this is the last delivered sequence
 3111          * and we will be sending in 0 after the reset.
 3112          */
 3113 
 3114         if (number_entries) {
 3115                 for (i = 0; i < number_entries; i++) {
 3116                         temp = ntohs(list[i]);
 3117                         if (temp >= stcb->asoc.streamincnt) {
 3118                                 continue;
 3119                         }
 3120                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
 3121                 }
 3122         } else {
 3123                 list = NULL;
 3124                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
 3125                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
 3126                 }
 3127         }
 3128         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
 3129 }
 3130 
 3131 static void
 3132 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
 3133 {
 3134         int i;
 3135 
 3136         if (number_entries == 0) {
 3137                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3138                         stcb->asoc.strmout[i].next_sequence_sent = 0;
 3139                 }
 3140         } else if (number_entries) {
 3141                 for (i = 0; i < number_entries; i++) {
 3142                         uint16_t temp;
 3143 
 3144                         temp = ntohs(list[i]);
 3145                         if (temp >= stcb->asoc.streamoutcnt) {
 3146                                 /* no such stream */
 3147                                 continue;
 3148                         }
 3149                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
 3150                 }
 3151         }
 3152         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
 3153 }
 3154 
 3155 
 3156 struct sctp_stream_reset_out_request *
 3157 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
 3158 {
 3159         struct sctp_association *asoc;
 3160         struct sctp_stream_reset_out_req *req;
 3161         struct sctp_stream_reset_out_request *r;
 3162         struct sctp_tmit_chunk *chk;
 3163         int len, clen;
 3164 
 3165         asoc = &stcb->asoc;
 3166         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
 3167                 asoc->stream_reset_outstanding = 0;
 3168                 return (NULL);
 3169         }
 3170         if (stcb->asoc.str_reset == NULL) {
 3171                 asoc->stream_reset_outstanding = 0;
 3172                 return (NULL);
 3173         }
 3174         chk = stcb->asoc.str_reset;
 3175         if (chk->data == NULL) {
 3176                 return (NULL);
 3177         }
 3178         if (bchk) {
 3179                 /* he wants a copy of the chk pointer */
 3180                 *bchk = chk;
 3181         }
 3182         clen = chk->send_size;
 3183         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
 3184         r = &req->sr_req;
 3185         if (ntohl(r->request_seq) == seq) {
 3186                 /* found it */
 3187                 return (r);
 3188         }
 3189         len = SCTP_SIZE32(ntohs(r->ph.param_length));
 3190         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
 3191                 /* move to the next one, there can only be a max of two */
 3192                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
 3193                 if (ntohl(r->request_seq) == seq) {
 3194                         return (r);
 3195                 }
 3196         }
 3197         /* that seq is not here */
 3198         return (NULL);
 3199 }
 3200 
 3201 static void
 3202 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
 3203 {
 3204         struct sctp_association *asoc;
 3205         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
 3206 
 3207         if (stcb->asoc.str_reset == NULL) {
 3208                 return;
 3209         }
 3210         asoc = &stcb->asoc;
 3211 
 3212         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
 3213         TAILQ_REMOVE(&asoc->control_send_queue,
 3214             chk,
 3215             sctp_next);
 3216         if (chk->data) {
 3217                 sctp_m_freem(chk->data);
 3218                 chk->data = NULL;
 3219         }
 3220         asoc->ctrl_queue_cnt--;
 3221         sctp_free_a_chunk(stcb, chk);
 3222         /* sa_ignore NO_NULL_CHK */
 3223         stcb->asoc.str_reset = NULL;
 3224 }
 3225 
 3226 
 3227 static int
 3228 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
 3229     uint32_t seq, uint32_t action,
 3230     struct sctp_stream_reset_response *respin)
 3231 {
 3232         uint16_t type;
 3233         int lparm_len;
 3234         struct sctp_association *asoc = &stcb->asoc;
 3235         struct sctp_tmit_chunk *chk;
 3236         struct sctp_stream_reset_out_request *srparam;
 3237         int number_entries;
 3238 
 3239         if (asoc->stream_reset_outstanding == 0) {
 3240                 /* duplicate */
 3241                 return (0);
 3242         }
 3243         if (seq == stcb->asoc.str_reset_seq_out) {
 3244                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
 3245                 if (srparam) {
 3246                         stcb->asoc.str_reset_seq_out++;
 3247                         type = ntohs(srparam->ph.param_type);
 3248                         lparm_len = ntohs(srparam->ph.param_length);
 3249                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
 3250                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
 3251                                 asoc->stream_reset_out_is_outstanding = 0;
 3252                                 if (asoc->stream_reset_outstanding)
 3253                                         asoc->stream_reset_outstanding--;
 3254                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
 3255                                         /* do it */
 3256                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
 3257                                 } else {
 3258                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
 3259                                 }
 3260                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
 3261                                 /* Answered my request */
 3262                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
 3263                                 if (asoc->stream_reset_outstanding)
 3264                                         asoc->stream_reset_outstanding--;
 3265                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
 3266                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
 3267                                 }
 3268                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
 3269                                 /**
 3270                                  * a) Adopt the new in tsn.
 3271                                  * b) reset the map
 3272                                  * c) Adopt the new out-tsn
 3273                                  */
 3274                                 struct sctp_stream_reset_response_tsn *resp;
 3275                                 struct sctp_forward_tsn_chunk fwdtsn;
 3276                                 int abort_flag = 0;
 3277 
 3278                                 if (respin == NULL) {
 3279                                         /* huh ? */
 3280                                         return (0);
 3281                                 }
 3282                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
 3283                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
 3284                                         asoc->stream_reset_outstanding--;
 3285                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
 3286                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 3287                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
 3288                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
 3289                                         if (abort_flag) {
 3290                                                 return (1);
 3291                                         }
 3292                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
 3293                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 3294                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 3295                                         }
 3296                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
 3297                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
 3298                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
 3299                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
 3300                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
 3301 
 3302                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
 3303                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
 3304 
 3305                                 }
 3306                         }
 3307                         /* get rid of the request and get the request flags */
 3308                         if (asoc->stream_reset_outstanding == 0) {
 3309                                 sctp_clean_up_stream_reset(stcb);
 3310                         }
 3311                 }
 3312         }
 3313         return (0);
 3314 }
 3315 
 3316 static void
 3317 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
 3318     struct sctp_tmit_chunk *chk,
 3319     struct sctp_stream_reset_in_request *req, int trunc)
 3320 {
 3321         uint32_t seq;
 3322         int len, i;
 3323         int number_entries;
 3324         uint16_t temp;
 3325 
 3326         /*
 3327          * peer wants me to send a str-reset to him for my outgoing seq's if
 3328          * seq_in is right.
 3329          */
 3330         struct sctp_association *asoc = &stcb->asoc;
 3331 
 3332         seq = ntohl(req->request_seq);
 3333         if (asoc->str_reset_seq_in == seq) {
 3334                 if (trunc) {
 3335                         /* Can't do it, since they exceeded our buffer size  */
 3336                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3337                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
 3338                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3339                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
 3340                         len = ntohs(req->ph.param_length);
 3341                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
 3342                         for (i = 0; i < number_entries; i++) {
 3343                                 temp = ntohs(req->list_of_streams[i]);
 3344                                 req->list_of_streams[i] = temp;
 3345                         }
 3346                         /* move the reset action back one */
 3347                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3348                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
 3349                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
 3350                             asoc->str_reset_seq_out,
 3351                             seq, (asoc->sending_seq - 1));
 3352                         asoc->stream_reset_out_is_outstanding = 1;
 3353                         asoc->str_reset = chk;
 3354                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
 3355                         stcb->asoc.stream_reset_outstanding++;
 3356                 } else {
 3357                         /* Can't do it, since we have sent one out */
 3358                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3359                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
 3360                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3361                 }
 3362                 asoc->str_reset_seq_in++;
 3363         } else if (asoc->str_reset_seq_in - 1 == seq) {
 3364                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3365         } else if (asoc->str_reset_seq_in - 2 == seq) {
 3366                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 3367         } else {
 3368                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
 3369         }
 3370 }
 3371 
 3372 static int
 3373 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
 3374     struct sctp_tmit_chunk *chk,
 3375     struct sctp_stream_reset_tsn_request *req)
 3376 {
 3377         /* reset all in and out and update the tsn */
 3378         /*
 3379          * A) reset my str-seq's on in and out. B) Select a receive next,
 3380          * and set cum-ack to it. Also process this selected number as a
 3381          * fwd-tsn as well. C) set in the response my next sending seq.
 3382          */
 3383         struct sctp_forward_tsn_chunk fwdtsn;
 3384         struct sctp_association *asoc = &stcb->asoc;
 3385         int abort_flag = 0;
 3386         uint32_t seq;
 3387 
 3388         seq = ntohl(req->request_seq);
 3389         if (asoc->str_reset_seq_in == seq) {
 3390                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
 3391                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 3392                 fwdtsn.ch.chunk_flags = 0;
 3393                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
 3394                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
 3395                 if (abort_flag) {
 3396                         return (1);
 3397                 }
 3398                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
 3399                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 3400                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 3401                 }
 3402                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
 3403                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
 3404                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
 3405                 atomic_add_int(&stcb->asoc.sending_seq, 1);
 3406                 /* save off historical data for retrans */
 3407                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
 3408                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
 3409                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
 3410                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
 3411 
 3412                 sctp_add_stream_reset_result_tsn(chk,
 3413                     ntohl(req->request_seq),
 3414                     SCTP_STREAM_RESET_PERFORMED,
 3415                     stcb->asoc.sending_seq,
 3416                     stcb->asoc.mapping_array_base_tsn);
 3417                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
 3418                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
 3419                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
 3420                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
 3421 
 3422                 asoc->str_reset_seq_in++;
 3423         } else if (asoc->str_reset_seq_in - 1 == seq) {
 3424                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
 3425                     stcb->asoc.last_sending_seq[0],
 3426                     stcb->asoc.last_base_tsnsent[0]
 3427                     );
 3428         } else if (asoc->str_reset_seq_in - 2 == seq) {
 3429                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
 3430                     stcb->asoc.last_sending_seq[1],
 3431                     stcb->asoc.last_base_tsnsent[1]
 3432                     );
 3433         } else {
 3434                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
 3435         }
 3436         return (0);
 3437 }
 3438 
 3439 static void
 3440 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
 3441     struct sctp_tmit_chunk *chk,
 3442     struct sctp_stream_reset_out_request *req, int trunc)
 3443 {
 3444         uint32_t seq, tsn;
 3445         int number_entries, len;
 3446         struct sctp_association *asoc = &stcb->asoc;
 3447 
 3448         seq = ntohl(req->request_seq);
 3449 
 3450         /* now if its not a duplicate we process it */
 3451         if (asoc->str_reset_seq_in == seq) {
 3452                 len = ntohs(req->ph.param_length);
 3453                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
 3454                 /*
 3455                  * the sender is resetting, handle the list issue.. we must
 3456                  * a) verify if we can do the reset, if so no problem b) If
 3457                  * we can't do the reset we must copy the request. c) queue
 3458                  * it, and setup the data in processor to trigger it off
 3459                  * when needed and dequeue all the queued data.
 3460                  */
 3461                 tsn = ntohl(req->send_reset_at_tsn);
 3462 
 3463                 /* move the reset action back one */
 3464                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3465                 if (trunc) {
 3466                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
 3467                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
 3468                 } else if ((tsn == asoc->cumulative_tsn) ||
 3469                     (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) {
 3470                         /* we can do it now */
 3471                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
 3472                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
 3473                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
 3474                 } else {
 3475                         /*
 3476                          * we must queue it up and thus wait for the TSN's
 3477                          * to arrive that are at or before tsn
 3478                          */
 3479                         struct sctp_stream_reset_list *liste;
 3480                         int siz;
 3481 
 3482                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
 3483                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
 3484                             siz, SCTP_M_STRESET);
 3485                         if (liste == NULL) {
 3486                                 /* gak out of memory */
 3487                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
 3488                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
 3489                                 return;
 3490                         }
 3491                         liste->tsn = tsn;
 3492                         liste->number_entries = number_entries;
 3493                         memcpy(&liste->req, req,
 3494                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
 3495                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
 3496                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
 3497                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
 3498                 }
 3499                 asoc->str_reset_seq_in++;
 3500         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 3501                 /*
 3502                  * one seq back, just echo back last action since my
 3503                  * response was lost.
 3504                  */
 3505                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3506         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 3507                 /*
 3508                  * two seq back, just echo back last action since my
 3509                  * response was lost.
 3510                  */
 3511                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 3512         } else {
 3513                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
 3514         }
 3515 }
 3516 
 3517 #ifdef __GNUC__
 3518 __attribute__((noinline))
 3519 #endif
 3520         static int
 3521             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
 3522         struct sctp_stream_reset_out_req *sr_req)
 3523 {
 3524         int chk_length, param_len, ptype;
 3525         struct sctp_paramhdr pstore;
 3526         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
 3527 
 3528         uint32_t seq;
 3529         int num_req = 0;
 3530         int trunc = 0;
 3531         struct sctp_tmit_chunk *chk;
 3532         struct sctp_chunkhdr *ch;
 3533         struct sctp_paramhdr *ph;
 3534         int ret_code = 0;
 3535         int num_param = 0;
 3536 
 3537         /* now it may be a reset or a reset-response */
 3538         chk_length = ntohs(sr_req->ch.chunk_length);
 3539 
 3540         /* setup for adding the response */
 3541         sctp_alloc_a_chunk(stcb, chk);
 3542         if (chk == NULL) {
 3543                 return (ret_code);
 3544         }
 3545         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
 3546         chk->rec.chunk_id.can_take_data = 0;
 3547         chk->asoc = &stcb->asoc;
 3548         chk->no_fr_allowed = 0;
 3549         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
 3550         chk->book_size_scale = 0;
 3551         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
 3552         if (chk->data == NULL) {
 3553 strres_nochunk:
 3554                 if (chk->data) {
 3555                         sctp_m_freem(chk->data);
 3556                         chk->data = NULL;
 3557                 }
 3558                 sctp_free_a_chunk(stcb, chk);
 3559                 return (ret_code);
 3560         }
 3561         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
 3562 
 3563         /* setup chunk parameters */
 3564         chk->sent = SCTP_DATAGRAM_UNSENT;
 3565         chk->snd_count = 0;
 3566         chk->whoTo = stcb->asoc.primary_destination;
 3567         atomic_add_int(&chk->whoTo->ref_count, 1);
 3568 
 3569         ch = mtod(chk->data, struct sctp_chunkhdr *);
 3570         ch->chunk_type = SCTP_STREAM_RESET;
 3571         ch->chunk_flags = 0;
 3572         ch->chunk_length = htons(chk->send_size);
 3573         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
 3574         offset += sizeof(struct sctp_chunkhdr);
 3575         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
 3576                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
 3577                 if (ph == NULL)
 3578                         break;
 3579                 param_len = ntohs(ph->param_length);
 3580                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
 3581                         /* bad param */
 3582                         break;
 3583                 }
 3584                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
 3585                     (uint8_t *) & cstore);
 3586                 ptype = ntohs(ph->param_type);
 3587                 num_param++;
 3588                 if (param_len > (int)sizeof(cstore)) {
 3589                         trunc = 1;
 3590                 } else {
 3591                         trunc = 0;
 3592                 }
 3593 
 3594                 if (num_param > SCTP_MAX_RESET_PARAMS) {
 3595                         /* hit the max of parameters already sorry.. */
 3596                         break;
 3597                 }
 3598                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
 3599                         struct sctp_stream_reset_out_request *req_out;
 3600 
 3601                         req_out = (struct sctp_stream_reset_out_request *)ph;
 3602                         num_req++;
 3603                         if (stcb->asoc.stream_reset_outstanding) {
 3604                                 seq = ntohl(req_out->response_seq);
 3605                                 if (seq == stcb->asoc.str_reset_seq_out) {
 3606                                         /* implicit ack */
 3607                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
 3608                                 }
 3609                         }
 3610                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
 3611                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
 3612                         struct sctp_stream_reset_in_request *req_in;
 3613 
 3614                         num_req++;
 3615 
 3616                         req_in = (struct sctp_stream_reset_in_request *)ph;
 3617 
 3618                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
 3619                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
 3620                         struct sctp_stream_reset_tsn_request *req_tsn;
 3621 
 3622                         num_req++;
 3623                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
 3624 
 3625                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
 3626                                 ret_code = 1;
 3627                                 goto strres_nochunk;
 3628                         }
 3629                         /* no more */
 3630                         break;
 3631                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
 3632                         struct sctp_stream_reset_response *resp;
 3633                         uint32_t result;
 3634 
 3635                         resp = (struct sctp_stream_reset_response *)ph;
 3636                         seq = ntohl(resp->response_seq);
 3637                         result = ntohl(resp->result);
 3638                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
 3639                                 ret_code = 1;
 3640                                 goto strres_nochunk;
 3641                         }
 3642                 } else {
 3643                         break;
 3644                 }
 3645                 offset += SCTP_SIZE32(param_len);
 3646                 chk_length -= SCTP_SIZE32(param_len);
 3647         }
 3648         if (num_req == 0) {
 3649                 /* we have no response free the stuff */
 3650                 goto strres_nochunk;
 3651         }
 3652         /* ok we have a chunk to link in */
 3653         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
 3654             chk,
 3655             sctp_next);
 3656         stcb->asoc.ctrl_queue_cnt++;
 3657         return (ret_code);
 3658 }
 3659 
 3660 /*
 3661  * Handle a router or endpoints report of a packet loss, there are two ways
 3662  * to handle this, either we get the whole packet and must disect it
 3663  * ourselves (possibly with truncation and or corruption) or it is a summary
 3664  * from a middle box that did the disectting for us.
 3665  */
 3666 static void
 3667 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
 3668     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
 3669 {
 3670         uint32_t bottle_bw, on_queue;
 3671         uint16_t trunc_len;
 3672         unsigned int chlen;
 3673         unsigned int at;
 3674         struct sctp_chunk_desc desc;
 3675         struct sctp_chunkhdr *ch;
 3676 
 3677         chlen = ntohs(cp->ch.chunk_length);
 3678         chlen -= sizeof(struct sctp_pktdrop_chunk);
 3679         /* XXX possible chlen underflow */
 3680         if (chlen == 0) {
 3681                 ch = NULL;
 3682                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
 3683                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
 3684         } else {
 3685                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
 3686                 chlen -= sizeof(struct sctphdr);
 3687                 /* XXX possible chlen underflow */
 3688                 memset(&desc, 0, sizeof(desc));
 3689         }
 3690         trunc_len = (uint16_t) ntohs(cp->trunc_len);
 3691         if (trunc_len > limit) {
 3692                 trunc_len = limit;
 3693         }
 3694         /* now the chunks themselves */
 3695         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
 3696                 desc.chunk_type = ch->chunk_type;
 3697                 /* get amount we need to move */
 3698                 at = ntohs(ch->chunk_length);
 3699                 if (at < sizeof(struct sctp_chunkhdr)) {
 3700                         /* corrupt chunk, maybe at the end? */
 3701                         SCTP_STAT_INCR(sctps_pdrpcrupt);
 3702                         break;
 3703                 }
 3704                 if (trunc_len == 0) {
 3705                         /* we are supposed to have all of it */
 3706                         if (at > chlen) {
 3707                                 /* corrupt skip it */
 3708                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
 3709                                 break;
 3710                         }
 3711                 } else {
 3712                         /* is there enough of it left ? */
 3713                         if (desc.chunk_type == SCTP_DATA) {
 3714                                 if (chlen < (sizeof(struct sctp_data_chunk) +
 3715                                     sizeof(desc.data_bytes))) {
 3716                                         break;
 3717                                 }
 3718                         } else {
 3719                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
 3720                                         break;
 3721                                 }
 3722                         }
 3723                 }
 3724                 if (desc.chunk_type == SCTP_DATA) {
 3725                         /* can we get out the tsn? */
 3726                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
 3727                                 SCTP_STAT_INCR(sctps_pdrpmbda);
 3728 
 3729                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
 3730                                 /* yep */
 3731                                 struct sctp_data_chunk *dcp;
 3732                                 uint8_t *ddp;
 3733                                 unsigned int iii;
 3734 
 3735                                 dcp = (struct sctp_data_chunk *)ch;
 3736                                 ddp = (uint8_t *) (dcp + 1);
 3737                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
 3738                                         desc.data_bytes[iii] = ddp[iii];
 3739                                 }
 3740                                 desc.tsn_ifany = dcp->dp.tsn;
 3741                         } else {
 3742                                 /* nope we are done. */
 3743                                 SCTP_STAT_INCR(sctps_pdrpnedat);
 3744                                 break;
 3745                         }
 3746                 } else {
 3747                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
 3748                                 SCTP_STAT_INCR(sctps_pdrpmbct);
 3749                 }
 3750 
 3751                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
 3752                         SCTP_STAT_INCR(sctps_pdrppdbrk);
 3753                         break;
 3754                 }
 3755                 if (SCTP_SIZE32(at) > chlen) {
 3756                         break;
 3757                 }
 3758                 chlen -= SCTP_SIZE32(at);
 3759                 if (chlen < sizeof(struct sctp_chunkhdr)) {
 3760                         /* done, none left */
 3761                         break;
 3762                 }
 3763                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
 3764         }
 3765         /* Now update any rwnd --- possibly */
 3766         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
 3767                 /* From a peer, we get a rwnd report */
 3768                 uint32_t a_rwnd;
 3769 
 3770                 SCTP_STAT_INCR(sctps_pdrpfehos);
 3771 
 3772                 bottle_bw = ntohl(cp->bottle_bw);
 3773                 on_queue = ntohl(cp->current_onq);
 3774                 if (bottle_bw && on_queue) {
 3775                         /* a rwnd report is in here */
 3776                         if (bottle_bw > on_queue)
 3777                                 a_rwnd = bottle_bw - on_queue;
 3778                         else
 3779                                 a_rwnd = 0;
 3780 
 3781                         if (a_rwnd == 0)
 3782                                 stcb->asoc.peers_rwnd = 0;
 3783                         else {
 3784                                 if (a_rwnd > stcb->asoc.total_flight) {
 3785                                         stcb->asoc.peers_rwnd =
 3786                                             a_rwnd - stcb->asoc.total_flight;
 3787                                 } else {
 3788                                         stcb->asoc.peers_rwnd = 0;
 3789                                 }
 3790                                 if (stcb->asoc.peers_rwnd <
 3791                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 3792                                         /* SWS sender side engages */
 3793                                         stcb->asoc.peers_rwnd = 0;
 3794                                 }
 3795                         }
 3796                 }
 3797         } else {
 3798                 SCTP_STAT_INCR(sctps_pdrpfmbox);
 3799         }
 3800 
 3801         /* now middle boxes in sat networks get a cwnd bump */
 3802         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
 3803             (stcb->asoc.sat_t3_loss_recovery == 0) &&
 3804             (stcb->asoc.sat_network)) {
 3805                 /*
 3806                  * This is debateable but for sat networks it makes sense
 3807                  * Note if a T3 timer has went off, we will prohibit any
 3808                  * changes to cwnd until we exit the t3 loss recovery.
 3809                  */
 3810                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
 3811                     net, cp, &bottle_bw, &on_queue);
 3812         }
 3813 }
 3814 
 3815 /*
 3816  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
 3817  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
 3818  * offset: offset into the mbuf chain to first chunkhdr - length: is the
 3819  * length of the complete packet outputs: - length: modified to remaining
 3820  * length after control processing - netp: modified to new sctp_nets after
 3821  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
 3822  * bad packet,...) otherwise return the tcb for this packet
 3823  */
 3824 #ifdef __GNUC__
 3825 __attribute__((noinline))
 3826 #endif
 3827         static struct sctp_tcb *
 3828                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
 3829              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
 3830              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
 3831              uint32_t vrf_id, uint16_t port)
 3832 {
 3833         struct sctp_association *asoc;
 3834         uint32_t vtag_in;
 3835         int num_chunks = 0;     /* number of control chunks processed */
 3836         uint32_t chk_length;
 3837         int ret;
 3838         int abort_no_unlock = 0;
 3839 
 3840         /*
 3841          * How big should this be, and should it be alloc'd? Lets try the
 3842          * d-mtu-ceiling for now (2k) and that should hopefully work ...
 3843          * until we get into jumbo grams and such..
 3844          */
 3845         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
 3846         struct sctp_tcb *locked_tcb = stcb;
 3847         int got_auth = 0;
 3848         uint32_t auth_offset = 0, auth_len = 0;
 3849         int auth_skipped = 0;
 3850         int asconf_cnt = 0;
 3851 
 3852 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3853         struct socket *so;
 3854 
 3855 #endif
 3856 
 3857         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
 3858             iphlen, *offset, length, stcb);
 3859 
 3860         /* validate chunk header length... */
 3861         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
 3862                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
 3863                     ntohs(ch->chunk_length));
 3864                 if (locked_tcb) {
 3865                         SCTP_TCB_UNLOCK(locked_tcb);
 3866                 }
 3867                 return (NULL);
 3868         }
 3869         /*
 3870          * validate the verification tag
 3871          */
 3872         vtag_in = ntohl(sh->v_tag);
 3873 
 3874         if (locked_tcb) {
 3875                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
 3876         }
 3877         if (ch->chunk_type == SCTP_INITIATION) {
 3878                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
 3879                     ntohs(ch->chunk_length), vtag_in);
 3880                 if (vtag_in != 0) {
 3881                         /* protocol error- silently discard... */
 3882                         SCTP_STAT_INCR(sctps_badvtag);
 3883                         if (locked_tcb) {
 3884                                 SCTP_TCB_UNLOCK(locked_tcb);
 3885                         }
 3886                         return (NULL);
 3887                 }
 3888         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
 3889                 /*
 3890                  * If there is no stcb, skip the AUTH chunk and process
 3891                  * later after a stcb is found (to validate the lookup was
 3892                  * valid.
 3893                  */
 3894                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
 3895                     (stcb == NULL) &&
 3896                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
 3897                         /* save this chunk for later processing */
 3898                         auth_skipped = 1;
 3899                         auth_offset = *offset;
 3900                         auth_len = ntohs(ch->chunk_length);
 3901 
 3902                         /* (temporarily) move past this chunk */
 3903                         *offset += SCTP_SIZE32(auth_len);
 3904                         if (*offset >= length) {
 3905                                 /* no more data left in the mbuf chain */
 3906                                 *offset = length;
 3907                                 if (locked_tcb) {
 3908                                         SCTP_TCB_UNLOCK(locked_tcb);
 3909                                 }
 3910                                 return (NULL);
 3911                         }
 3912                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 3913                             sizeof(struct sctp_chunkhdr), chunk_buf);
 3914                 }
 3915                 if (ch == NULL) {
 3916                         /* Help */
 3917                         *offset = length;
 3918                         if (locked_tcb) {
 3919                                 SCTP_TCB_UNLOCK(locked_tcb);
 3920                         }
 3921                         return (NULL);
 3922                 }
 3923                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
 3924                         goto process_control_chunks;
 3925                 }
 3926                 /*
 3927                  * first check if it's an ASCONF with an unknown src addr we
 3928                  * need to look inside to find the association
 3929                  */
 3930                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
 3931                         struct sctp_chunkhdr *asconf_ch = ch;
 3932                         uint32_t asconf_offset = 0, asconf_len = 0;
 3933 
 3934                         /* inp's refcount may be reduced */
 3935                         SCTP_INP_INCR_REF(inp);
 3936 
 3937                         asconf_offset = *offset;
 3938                         do {
 3939                                 asconf_len = ntohs(asconf_ch->chunk_length);
 3940                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
 3941                                         break;
 3942                                 stcb = sctp_findassociation_ep_asconf(m, iphlen,
 3943                                     *offset, sh, &inp, netp);
 3944                                 if (stcb != NULL)
 3945                                         break;
 3946                                 asconf_offset += SCTP_SIZE32(asconf_len);
 3947                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
 3948                                     sizeof(struct sctp_chunkhdr), chunk_buf);
 3949                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
 3950                         if (stcb == NULL) {
 3951                                 /*
 3952                                  * reduce inp's refcount if not reduced in
 3953                                  * sctp_findassociation_ep_asconf().
 3954                                  */
 3955                                 SCTP_INP_DECR_REF(inp);
 3956                         } else {
 3957                                 locked_tcb = stcb;
 3958                         }
 3959 
 3960                         /* now go back and verify any auth chunk to be sure */
 3961                         if (auth_skipped && (stcb != NULL)) {
 3962                                 struct sctp_auth_chunk *auth;
 3963 
 3964                                 auth = (struct sctp_auth_chunk *)
 3965                                     sctp_m_getptr(m, auth_offset,
 3966                                     auth_len, chunk_buf);
 3967                                 got_auth = 1;
 3968                                 auth_skipped = 0;
 3969                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
 3970                                     auth_offset)) {
 3971                                         /* auth HMAC failed so dump it */
 3972                                         *offset = length;
 3973                                         if (locked_tcb) {
 3974                                                 SCTP_TCB_UNLOCK(locked_tcb);
 3975                                         }
 3976                                         return (NULL);
 3977                                 } else {
 3978                                         /* remaining chunks are HMAC checked */
 3979                                         stcb->asoc.authenticated = 1;
 3980                                 }
 3981                         }
 3982                 }
 3983                 if (stcb == NULL) {
 3984                         /* no association, so it's out of the blue... */
 3985                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
 3986                             vrf_id, port);
 3987                         *offset = length;
 3988                         if (locked_tcb) {
 3989                                 SCTP_TCB_UNLOCK(locked_tcb);
 3990                         }
 3991                         return (NULL);
 3992                 }
 3993                 asoc = &stcb->asoc;
 3994                 /* ABORT and SHUTDOWN can use either v_tag... */
 3995                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
 3996                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
 3997                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
 3998                         if ((vtag_in == asoc->my_vtag) ||
 3999                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
 4000                             (vtag_in == asoc->peer_vtag))) {
 4001                                 /* this is valid */
 4002                         } else {
 4003                                 /* drop this packet... */
 4004                                 SCTP_STAT_INCR(sctps_badvtag);
 4005                                 if (locked_tcb) {
 4006                                         SCTP_TCB_UNLOCK(locked_tcb);
 4007                                 }
 4008                                 return (NULL);
 4009                         }
 4010                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 4011                         if (vtag_in != asoc->my_vtag) {
 4012                                 /*
 4013                                  * this could be a stale SHUTDOWN-ACK or the
 4014                                  * peer never got the SHUTDOWN-COMPLETE and
 4015                                  * is still hung; we have started a new asoc
 4016                                  * but it won't complete until the shutdown
 4017                                  * is completed
 4018                                  */
 4019                                 if (locked_tcb) {
 4020                                         SCTP_TCB_UNLOCK(locked_tcb);
 4021                                 }
 4022                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
 4023                                     NULL, vrf_id, port);
 4024                                 return (NULL);
 4025                         }
 4026                 } else {
 4027                         /* for all other chunks, vtag must match */
 4028                         if (vtag_in != asoc->my_vtag) {
 4029                                 /* invalid vtag... */
 4030                                 SCTPDBG(SCTP_DEBUG_INPUT3,
 4031                                     "invalid vtag: %xh, expect %xh\n",
 4032                                     vtag_in, asoc->my_vtag);
 4033                                 SCTP_STAT_INCR(sctps_badvtag);
 4034                                 if (locked_tcb) {
 4035                                         SCTP_TCB_UNLOCK(locked_tcb);
 4036                                 }
 4037                                 *offset = length;
 4038                                 return (NULL);
 4039                         }
 4040                 }
 4041         }                       /* end if !SCTP_COOKIE_ECHO */
 4042         /*
 4043          * process all control chunks...
 4044          */
 4045         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
 4046             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
 4047             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 4048                 /* implied cookie-ack.. we must have lost the ack */
 4049                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4050                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4051                             stcb->asoc.overall_error_count,
 4052                             0,
 4053                             SCTP_FROM_SCTP_INPUT,
 4054                             __LINE__);
 4055                 }
 4056                 stcb->asoc.overall_error_count = 0;
 4057                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
 4058                     *netp);
 4059         }
 4060 process_control_chunks:
 4061         while (IS_SCTP_CONTROL(ch)) {
 4062                 /* validate chunk length */
 4063                 chk_length = ntohs(ch->chunk_length);
 4064                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
 4065                     ch->chunk_type, chk_length);
 4066                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
 4067                 if (chk_length < sizeof(*ch) ||
 4068                     (*offset + (int)chk_length) > length) {
 4069                         *offset = length;
 4070                         if (locked_tcb) {
 4071                                 SCTP_TCB_UNLOCK(locked_tcb);
 4072                         }
 4073                         return (NULL);
 4074                 }
 4075                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
 4076                 /*
 4077                  * INIT-ACK only gets the init ack "header" portion only
 4078                  * because we don't have to process the peer's COOKIE. All
 4079                  * others get a complete chunk.
 4080                  */
 4081                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
 4082                     (ch->chunk_type == SCTP_INITIATION)) {
 4083                         /* get an init-ack chunk */
 4084                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4085                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
 4086                         if (ch == NULL) {
 4087                                 *offset = length;
 4088                                 if (locked_tcb) {
 4089                                         SCTP_TCB_UNLOCK(locked_tcb);
 4090                                 }
 4091                                 return (NULL);
 4092                         }
 4093                 } else {
 4094                         /* For cookies and all other chunks. */
 4095                         if (chk_length > sizeof(chunk_buf)) {
 4096                                 /*
 4097                                  * use just the size of the chunk buffer so
 4098                                  * the front part of our chunks fit in
 4099                                  * contiguous space up to the chunk buffer
 4100                                  * size (508 bytes). For chunks that need to
 4101                                  * get more than that they must use the
 4102                                  * sctp_m_getptr() function or other means
 4103                                  * (e.g. know how to parse mbuf chains).
 4104                                  * Cookies do this already.
 4105                                  */
 4106                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4107                                     (sizeof(chunk_buf) - 4),
 4108                                     chunk_buf);
 4109                                 if (ch == NULL) {
 4110                                         *offset = length;
 4111                                         if (locked_tcb) {
 4112                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4113                                         }
 4114                                         return (NULL);
 4115                                 }
 4116                         } else {
 4117                                 /* We can fit it all */
 4118                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4119                                     chk_length, chunk_buf);
 4120                                 if (ch == NULL) {
 4121                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
 4122                                         *offset = length;
 4123                                         if (locked_tcb) {
 4124                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4125                                         }
 4126                                         return (NULL);
 4127                                 }
 4128                         }
 4129                 }
 4130                 num_chunks++;
 4131                 /* Save off the last place we got a control from */
 4132                 if (stcb != NULL) {
 4133                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
 4134                                 /*
 4135                                  * allow last_control to be NULL if
 4136                                  * ASCONF... ASCONF processing will find the
 4137                                  * right net later
 4138                                  */
 4139                                 if ((netp != NULL) && (*netp != NULL))
 4140                                         stcb->asoc.last_control_chunk_from = *netp;
 4141                         }
 4142                 }
 4143 #ifdef SCTP_AUDITING_ENABLED
 4144                 sctp_audit_log(0xB0, ch->chunk_type);
 4145 #endif
 4146 
 4147                 /* check to see if this chunk required auth, but isn't */
 4148                 if ((stcb != NULL) &&
 4149                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
 4150                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
 4151                     !stcb->asoc.authenticated) {
 4152                         /* "silently" ignore */
 4153                         SCTP_STAT_INCR(sctps_recvauthmissing);
 4154                         goto next_chunk;
 4155                 }
 4156                 switch (ch->chunk_type) {
 4157                 case SCTP_INITIATION:
 4158                         /* must be first and only chunk */
 4159                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
 4160                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4161                                 /* We are not interested anymore? */
 4162                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 4163                                         /*
 4164                                          * collision case where we are
 4165                                          * sending to them too
 4166                                          */
 4167                                         ;
 4168                                 } else {
 4169                                         if (locked_tcb) {
 4170                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4171                                         }
 4172                                         *offset = length;
 4173                                         return (NULL);
 4174                                 }
 4175                         }
 4176                         if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
 4177                             (num_chunks > 1) ||
 4178                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
 4179                                 *offset = length;
 4180                                 if (locked_tcb) {
 4181                                         SCTP_TCB_UNLOCK(locked_tcb);
 4182                                 }
 4183                                 return (NULL);
 4184                         }
 4185                         if ((stcb != NULL) &&
 4186                             (SCTP_GET_STATE(&stcb->asoc) ==
 4187                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 4188                                 sctp_send_shutdown_ack(stcb,
 4189                                     stcb->asoc.primary_destination);
 4190                                 *offset = length;
 4191                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 4192                                 if (locked_tcb) {
 4193                                         SCTP_TCB_UNLOCK(locked_tcb);
 4194                                 }
 4195                                 return (NULL);
 4196                         }
 4197                         if (netp) {
 4198                                 sctp_handle_init(m, iphlen, *offset, sh,
 4199                                     (struct sctp_init_chunk *)ch, inp,
 4200                                     stcb, *netp, &abort_no_unlock, vrf_id, port);
 4201                         }
 4202                         if (abort_no_unlock)
 4203                                 return (NULL);
 4204 
 4205                         *offset = length;
 4206                         if (locked_tcb) {
 4207                                 SCTP_TCB_UNLOCK(locked_tcb);
 4208                         }
 4209                         return (NULL);
 4210                         break;
 4211                 case SCTP_PAD_CHUNK:
 4212                         break;
 4213                 case SCTP_INITIATION_ACK:
 4214                         /* must be first and only chunk */
 4215                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
 4216                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4217                                 /* We are not interested anymore */
 4218                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 4219                                         ;
 4220                                 } else {
 4221                                         if (locked_tcb) {
 4222                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4223                                         }
 4224                                         *offset = length;
 4225                                         if (stcb) {
 4226 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4227                                                 so = SCTP_INP_SO(inp);
 4228                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4229                                                 SCTP_TCB_UNLOCK(stcb);
 4230                                                 SCTP_SOCKET_LOCK(so, 1);
 4231                                                 SCTP_TCB_LOCK(stcb);
 4232                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4233 #endif
 4234                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
 4235 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4236                                                 SCTP_SOCKET_UNLOCK(so, 1);
 4237 #endif
 4238                                         }
 4239                                         return (NULL);
 4240                                 }
 4241                         }
 4242                         if ((num_chunks > 1) ||
 4243                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
 4244                                 *offset = length;
 4245                                 if (locked_tcb) {
 4246                                         SCTP_TCB_UNLOCK(locked_tcb);
 4247                                 }
 4248                                 return (NULL);
 4249                         }
 4250                         if ((netp) && (*netp)) {
 4251                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
 4252                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
 4253                         } else {
 4254                                 ret = -1;
 4255                         }
 4256                         /*
 4257                          * Special case, I must call the output routine to
 4258                          * get the cookie echoed
 4259                          */
 4260                         if (abort_no_unlock)
 4261                                 return (NULL);
 4262 
 4263                         if ((stcb) && ret == 0)
 4264                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 4265                         *offset = length;
 4266                         if (locked_tcb) {
 4267                                 SCTP_TCB_UNLOCK(locked_tcb);
 4268                         }
 4269                         return (NULL);
 4270                         break;
 4271                 case SCTP_SELECTIVE_ACK:
 4272                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
 4273                         SCTP_STAT_INCR(sctps_recvsacks);
 4274                         {
 4275                                 struct sctp_sack_chunk *sack;
 4276                                 int abort_now = 0;
 4277                                 uint32_t a_rwnd, cum_ack;
 4278                                 uint16_t num_seg;
 4279                                 int nonce_sum_flag;
 4280 
 4281                                 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_sack_chunk))) {
 4282                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on sack chunk, too small\n");
 4283                         ignore_sack:
 4284                                         *offset = length;
 4285                                         if (locked_tcb) {
 4286                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4287                                         }
 4288                                         return (NULL);
 4289                                 }
 4290                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 4291                                         /*-
 4292                                          * If we have sent a shutdown-ack, we will pay no
 4293                                          * attention to a sack sent in to us since
 4294                                          * we don't care anymore.
 4295                                          */
 4296                                         goto ignore_sack;
 4297                                 }
 4298                                 sack = (struct sctp_sack_chunk *)ch;
 4299                                 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM;
 4300                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
 4301                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
 4302                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
 4303                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
 4304                                     cum_ack,
 4305                                     num_seg,
 4306                                     a_rwnd
 4307                                     );
 4308                                 stcb->asoc.seen_a_sack_this_pkt = 1;
 4309                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
 4310                                     (num_seg == 0) &&
 4311                                     ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) ||
 4312                                     (cum_ack == stcb->asoc.last_acked_seq)) &&
 4313                                     (stcb->asoc.saw_sack_with_frags == 0) &&
 4314                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
 4315                                     ) {
 4316                                         /*
 4317                                          * We have a SIMPLE sack having no
 4318                                          * prior segments and data on sent
 4319                                          * queue to be acked.. Use the
 4320                                          * faster path sack processing. We
 4321                                          * also allow window update sacks
 4322                                          * with no missing segments to go
 4323                                          * this way too.
 4324                                          */
 4325                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag,
 4326                                             &abort_now);
 4327                                 } else {
 4328                                         if (netp && *netp)
 4329                                                 sctp_handle_sack(m, *offset,
 4330                                                     sack, stcb, *netp, &abort_now, chk_length, a_rwnd);
 4331                                 }
 4332                                 if (abort_now) {
 4333                                         /* ABORT signal from sack processing */
 4334                                         *offset = length;
 4335                                         return (NULL);
 4336                                 }
 4337                         }
 4338                         break;
 4339                 case SCTP_HEARTBEAT_REQUEST:
 4340                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
 4341                         if ((stcb) && netp && *netp) {
 4342                                 SCTP_STAT_INCR(sctps_recvheartbeat);
 4343                                 sctp_send_heartbeat_ack(stcb, m, *offset,
 4344                                     chk_length, *netp);
 4345 
 4346                                 /* He's alive so give him credit */
 4347                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4348                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4349                                             stcb->asoc.overall_error_count,
 4350                                             0,
 4351                                             SCTP_FROM_SCTP_INPUT,
 4352                                             __LINE__);
 4353                                 }
 4354                                 stcb->asoc.overall_error_count = 0;
 4355                         }
 4356                         break;
 4357                 case SCTP_HEARTBEAT_ACK:
 4358                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
 4359                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
 4360                                 /* Its not ours */
 4361                                 *offset = length;
 4362                                 if (locked_tcb) {
 4363                                         SCTP_TCB_UNLOCK(locked_tcb);
 4364                                 }
 4365                                 return (NULL);
 4366                         }
 4367                         /* He's alive so give him credit */
 4368                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4369                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4370                                     stcb->asoc.overall_error_count,
 4371                                     0,
 4372                                     SCTP_FROM_SCTP_INPUT,
 4373                                     __LINE__);
 4374                         }
 4375                         stcb->asoc.overall_error_count = 0;
 4376                         SCTP_STAT_INCR(sctps_recvheartbeatack);
 4377                         if (netp && *netp)
 4378                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
 4379                                     stcb, *netp);
 4380                         break;
 4381                 case SCTP_ABORT_ASSOCIATION:
 4382                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
 4383                             stcb);
 4384                         if ((stcb) && netp && *netp)
 4385                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
 4386                                     stcb, *netp);
 4387                         *offset = length;
 4388                         return (NULL);
 4389                         break;
 4390                 case SCTP_SHUTDOWN:
 4391                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
 4392                             stcb);
 4393                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
 4394                                 *offset = length;
 4395                                 if (locked_tcb) {
 4396                                         SCTP_TCB_UNLOCK(locked_tcb);
 4397                                 }
 4398                                 return (NULL);
 4399                         }
 4400                         if (netp && *netp) {
 4401                                 int abort_flag = 0;
 4402 
 4403                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
 4404                                     stcb, *netp, &abort_flag);
 4405                                 if (abort_flag) {
 4406                                         *offset = length;
 4407                                         return (NULL);
 4408                                 }
 4409                         }
 4410                         break;
 4411                 case SCTP_SHUTDOWN_ACK:
 4412                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
 4413                         if ((stcb) && (netp) && (*netp))
 4414                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
 4415                         *offset = length;
 4416                         return (NULL);
 4417                         break;
 4418 
 4419                 case SCTP_OPERATION_ERROR:
 4420                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
 4421                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
 4422 
 4423                                 *offset = length;
 4424                                 return (NULL);
 4425                         }
 4426                         break;
 4427                 case SCTP_COOKIE_ECHO:
 4428                         SCTPDBG(SCTP_DEBUG_INPUT3,
 4429                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
 4430                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 4431                                 ;
 4432                         } else {
 4433                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4434                                         /* We are not interested anymore */
 4435                                         *offset = length;
 4436                                         return (NULL);
 4437                                 }
 4438                         }
 4439                         /*
 4440                          * First are we accepting? We do this again here
 4441                          * sincen it is possible that a previous endpoint
 4442                          * WAS listening responded to a INIT-ACK and then
 4443                          * closed. We opened and bound.. and are now no
 4444                          * longer listening.
 4445                          */
 4446 
 4447                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
 4448                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 4449                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
 4450                                         struct mbuf *oper;
 4451                                         struct sctp_paramhdr *phdr;
 4452 
 4453                                         oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 4454                                             0, M_DONTWAIT, 1, MT_DATA);
 4455                                         if (oper) {
 4456                                                 SCTP_BUF_LEN(oper) =
 4457                                                     sizeof(struct sctp_paramhdr);
 4458                                                 phdr = mtod(oper,
 4459                                                     struct sctp_paramhdr *);
 4460                                                 phdr->param_type =
 4461                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
 4462                                                 phdr->param_length =
 4463                                                     htons(sizeof(struct sctp_paramhdr));
 4464                                         }
 4465                                         sctp_abort_association(inp, stcb, m,
 4466                                             iphlen, sh, oper, vrf_id, port);
 4467                                 }
 4468                                 *offset = length;
 4469                                 return (NULL);
 4470                         } else {
 4471                                 struct mbuf *ret_buf;
 4472                                 struct sctp_inpcb *linp;
 4473 
 4474                                 if (stcb) {
 4475                                         linp = NULL;
 4476                                 } else {
 4477                                         linp = inp;
 4478                                 }
 4479 
 4480                                 if (linp) {
 4481                                         SCTP_ASOC_CREATE_LOCK(linp);
 4482                                 }
 4483                                 if (netp) {
 4484                                         ret_buf =
 4485                                             sctp_handle_cookie_echo(m, iphlen,
 4486                                             *offset, sh,
 4487                                             (struct sctp_cookie_echo_chunk *)ch,
 4488                                             &inp, &stcb, netp,
 4489                                             auth_skipped,
 4490                                             auth_offset,
 4491                                             auth_len,
 4492                                             &locked_tcb,
 4493                                             vrf_id,
 4494                                             port);
 4495                                 } else {
 4496                                         ret_buf = NULL;
 4497                                 }
 4498                                 if (linp) {
 4499                                         SCTP_ASOC_CREATE_UNLOCK(linp);
 4500                                 }
 4501                                 if (ret_buf == NULL) {
 4502                                         if (locked_tcb) {
 4503                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4504                                         }
 4505                                         SCTPDBG(SCTP_DEBUG_INPUT3,
 4506                                             "GAK, null buffer\n");
 4507                                         auth_skipped = 0;
 4508                                         *offset = length;
 4509                                         return (NULL);
 4510                                 }
 4511                                 /* if AUTH skipped, see if it verified... */
 4512                                 if (auth_skipped) {
 4513                                         got_auth = 1;
 4514                                         auth_skipped = 0;
 4515                                 }
 4516                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
 4517                                         /*
 4518                                          * Restart the timer if we have
 4519                                          * pending data
 4520                                          */
 4521                                         struct sctp_tmit_chunk *chk;
 4522 
 4523                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
 4524                                         if (chk) {
 4525                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
 4526                                                     stcb->sctp_ep, stcb,
 4527                                                     chk->whoTo);
 4528                                         }
 4529                                 }
 4530                         }
 4531                         break;
 4532                 case SCTP_COOKIE_ACK:
 4533                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
 4534                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
 4535                                 if (locked_tcb) {
 4536                                         SCTP_TCB_UNLOCK(locked_tcb);
 4537                                 }
 4538                                 return (NULL);
 4539                         }
 4540                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4541                                 /* We are not interested anymore */
 4542                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 4543                                         ;
 4544                                 } else if (stcb) {
 4545 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4546                                         so = SCTP_INP_SO(inp);
 4547                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 4548                                         SCTP_TCB_UNLOCK(stcb);
 4549                                         SCTP_SOCKET_LOCK(so, 1);
 4550                                         SCTP_TCB_LOCK(stcb);
 4551                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4552 #endif
 4553                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
 4554 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4555                                         SCTP_SOCKET_UNLOCK(so, 1);
 4556 #endif
 4557                                         *offset = length;
 4558                                         return (NULL);
 4559                                 }
 4560                         }
 4561                         /* He's alive so give him credit */
 4562                         if ((stcb) && netp && *netp) {
 4563                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4564                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4565                                             stcb->asoc.overall_error_count,
 4566                                             0,
 4567                                             SCTP_FROM_SCTP_INPUT,
 4568                                             __LINE__);
 4569                                 }
 4570                                 stcb->asoc.overall_error_count = 0;
 4571                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
 4572                         }
 4573                         break;
 4574                 case SCTP_ECN_ECHO:
 4575                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
 4576                         /* He's alive so give him credit */
 4577                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
 4578                                 /* Its not ours */
 4579                                 if (locked_tcb) {
 4580                                         SCTP_TCB_UNLOCK(locked_tcb);
 4581                                 }
 4582                                 *offset = length;
 4583                                 return (NULL);
 4584                         }
 4585                         if (stcb) {
 4586                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4587                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4588                                             stcb->asoc.overall_error_count,
 4589                                             0,
 4590                                             SCTP_FROM_SCTP_INPUT,
 4591                                             __LINE__);
 4592                                 }
 4593                                 stcb->asoc.overall_error_count = 0;
 4594                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
 4595                                     stcb);
 4596                         }
 4597                         break;
 4598                 case SCTP_ECN_CWR:
 4599                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
 4600                         /* He's alive so give him credit */
 4601                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
 4602                                 /* Its not ours */
 4603                                 if (locked_tcb) {
 4604                                         SCTP_TCB_UNLOCK(locked_tcb);
 4605                                 }
 4606                                 *offset = length;
 4607                                 return (NULL);
 4608                         }
 4609                         if (stcb) {
 4610                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4611                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4612                                             stcb->asoc.overall_error_count,
 4613                                             0,
 4614                                             SCTP_FROM_SCTP_INPUT,
 4615                                             __LINE__);
 4616                                 }
 4617                                 stcb->asoc.overall_error_count = 0;
 4618                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb);
 4619                         }
 4620                         break;
 4621                 case SCTP_SHUTDOWN_COMPLETE:
 4622                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
 4623                         /* must be first and only chunk */
 4624                         if ((num_chunks > 1) ||
 4625                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 4626                                 *offset = length;
 4627                                 if (locked_tcb) {
 4628                                         SCTP_TCB_UNLOCK(locked_tcb);
 4629                                 }
 4630                                 return (NULL);
 4631                         }
 4632                         if ((stcb) && netp && *netp) {
 4633                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
 4634                                     stcb, *netp);
 4635                         }
 4636                         *offset = length;
 4637                         return (NULL);
 4638                         break;
 4639                 case SCTP_ASCONF:
 4640                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
 4641                         /* He's alive so give him credit */
 4642                         if (stcb) {
 4643                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4644                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4645                                             stcb->asoc.overall_error_count,
 4646                                             0,
 4647                                             SCTP_FROM_SCTP_INPUT,
 4648                                             __LINE__);
 4649                                 }
 4650                                 stcb->asoc.overall_error_count = 0;
 4651                                 sctp_handle_asconf(m, *offset,
 4652                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
 4653                                 asconf_cnt++;
 4654                         }
 4655                         break;
 4656                 case SCTP_ASCONF_ACK:
 4657                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
 4658                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
 4659                                 /* Its not ours */
 4660                                 if (locked_tcb) {
 4661                                         SCTP_TCB_UNLOCK(locked_tcb);
 4662                                 }
 4663                                 *offset = length;
 4664                                 return (NULL);
 4665                         }
 4666                         if ((stcb) && netp && *netp) {
 4667                                 /* He's alive so give him credit */
 4668                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4669                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4670                                             stcb->asoc.overall_error_count,
 4671                                             0,
 4672                                             SCTP_FROM_SCTP_INPUT,
 4673                                             __LINE__);
 4674                                 }
 4675                                 stcb->asoc.overall_error_count = 0;
 4676                                 sctp_handle_asconf_ack(m, *offset,
 4677                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
 4678                                 if (abort_no_unlock)
 4679                                         return (NULL);
 4680                         }
 4681                         break;
 4682                 case SCTP_FORWARD_CUM_TSN:
 4683                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
 4684                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
 4685                                 /* Its not ours */
 4686                                 if (locked_tcb) {
 4687                                         SCTP_TCB_UNLOCK(locked_tcb);
 4688                                 }
 4689                                 *offset = length;
 4690                                 return (NULL);
 4691                         }
 4692                         /* He's alive so give him credit */
 4693                         if (stcb) {
 4694                                 int abort_flag = 0;
 4695 
 4696                                 stcb->asoc.overall_error_count = 0;
 4697                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4698                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4699                                             stcb->asoc.overall_error_count,
 4700                                             0,
 4701                                             SCTP_FROM_SCTP_INPUT,
 4702                                             __LINE__);
 4703                                 }
 4704                                 *fwd_tsn_seen = 1;
 4705                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4706                                         /* We are not interested anymore */
 4707 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4708                                         so = SCTP_INP_SO(inp);
 4709                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 4710                                         SCTP_TCB_UNLOCK(stcb);
 4711                                         SCTP_SOCKET_LOCK(so, 1);
 4712                                         SCTP_TCB_LOCK(stcb);
 4713                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4714 #endif
 4715                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
 4716 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4717                                         SCTP_SOCKET_UNLOCK(so, 1);
 4718 #endif
 4719                                         *offset = length;
 4720                                         return (NULL);
 4721                                 }
 4722                                 sctp_handle_forward_tsn(stcb,
 4723                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
 4724                                 if (abort_flag) {
 4725                                         *offset = length;
 4726                                         return (NULL);
 4727                                 } else {
 4728                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4729                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4730                                                     stcb->asoc.overall_error_count,
 4731                                                     0,
 4732                                                     SCTP_FROM_SCTP_INPUT,
 4733                                                     __LINE__);
 4734                                         }
 4735                                         stcb->asoc.overall_error_count = 0;
 4736                                 }
 4737 
 4738                         }
 4739                         break;
 4740                 case SCTP_STREAM_RESET:
 4741                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
 4742                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
 4743                                 /* Its not ours */
 4744                                 if (locked_tcb) {
 4745                                         SCTP_TCB_UNLOCK(locked_tcb);
 4746                                 }
 4747                                 *offset = length;
 4748                                 return (NULL);
 4749                         }
 4750                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4751                                 /* We are not interested anymore */
 4752 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4753                                 so = SCTP_INP_SO(inp);
 4754                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4755                                 SCTP_TCB_UNLOCK(stcb);
 4756                                 SCTP_SOCKET_LOCK(so, 1);
 4757                                 SCTP_TCB_LOCK(stcb);
 4758                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4759 #endif
 4760                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
 4761 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4762                                 SCTP_SOCKET_UNLOCK(so, 1);
 4763 #endif
 4764                                 *offset = length;
 4765                                 return (NULL);
 4766                         }
 4767                         if (stcb->asoc.peer_supports_strreset == 0) {
 4768                                 /*
 4769                                  * hmm, peer should have announced this, but
 4770                                  * we will turn it on since he is sending us
 4771                                  * a stream reset.
 4772                                  */
 4773                                 stcb->asoc.peer_supports_strreset = 1;
 4774                         }
 4775                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
 4776                                 /* stop processing */
 4777                                 *offset = length;
 4778                                 return (NULL);
 4779                         }
 4780                         break;
 4781                 case SCTP_PACKET_DROPPED:
 4782                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
 4783                         /* re-get it all please */
 4784                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
 4785                                 /* Its not ours */
 4786                                 if (locked_tcb) {
 4787                                         SCTP_TCB_UNLOCK(locked_tcb);
 4788                                 }
 4789                                 *offset = length;
 4790                                 return (NULL);
 4791                         }
 4792                         if (ch && (stcb) && netp && (*netp)) {
 4793                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
 4794                                     stcb, *netp,
 4795                                     min(chk_length, (sizeof(chunk_buf) - 4)));
 4796 
 4797                         }
 4798                         break;
 4799 
 4800                 case SCTP_AUTHENTICATION:
 4801                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
 4802                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
 4803                                 goto unknown_chunk;
 4804 
 4805                         if (stcb == NULL) {
 4806                                 /* save the first AUTH for later processing */
 4807                                 if (auth_skipped == 0) {
 4808                                         auth_offset = *offset;
 4809                                         auth_len = chk_length;
 4810                                         auth_skipped = 1;
 4811                                 }
 4812                                 /* skip this chunk (temporarily) */
 4813                                 goto next_chunk;
 4814                         }
 4815                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
 4816                             (chk_length > (sizeof(struct sctp_auth_chunk) +
 4817                             SCTP_AUTH_DIGEST_LEN_MAX))) {
 4818                                 /* Its not ours */
 4819                                 if (locked_tcb) {
 4820                                         SCTP_TCB_UNLOCK(locked_tcb);
 4821                                 }
 4822                                 *offset = length;
 4823                                 return (NULL);
 4824                         }
 4825                         if (got_auth == 1) {
 4826                                 /* skip this chunk... it's already auth'd */
 4827                                 goto next_chunk;
 4828                         }
 4829                         got_auth = 1;
 4830                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
 4831                             m, *offset)) {
 4832                                 /* auth HMAC failed so dump the packet */
 4833                                 *offset = length;
 4834                                 return (stcb);
 4835                         } else {
 4836                                 /* remaining chunks are HMAC checked */
 4837                                 stcb->asoc.authenticated = 1;
 4838                         }
 4839                         break;
 4840 
 4841                 default:
 4842         unknown_chunk:
 4843                         /* it's an unknown chunk! */
 4844                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
 4845                                 struct mbuf *mm;
 4846                                 struct sctp_paramhdr *phd;
 4847 
 4848                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 4849                                     0, M_DONTWAIT, 1, MT_DATA);
 4850                                 if (mm) {
 4851                                         phd = mtod(mm, struct sctp_paramhdr *);
 4852                                         /*
 4853                                          * We cheat and use param type since
 4854                                          * we did not bother to define a
 4855                                          * error cause struct. They are the
 4856                                          * same basic format with different
 4857                                          * names.
 4858                                          */
 4859                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
 4860                                         phd->param_length = htons(chk_length + sizeof(*phd));
 4861                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
 4862                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
 4863                                             M_DONTWAIT);
 4864                                         if (SCTP_BUF_NEXT(mm)) {
 4865 #ifdef SCTP_MBUF_LOGGING
 4866                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 4867                                                         struct mbuf *mat;
 4868 
 4869                                                         mat = SCTP_BUF_NEXT(mm);
 4870                                                         while (mat) {
 4871                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
 4872                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
 4873                                                                 }
 4874                                                                 mat = SCTP_BUF_NEXT(mat);
 4875                                                         }
 4876                                                 }
 4877 #endif
 4878                                                 sctp_queue_op_err(stcb, mm);
 4879                                         } else {
 4880                                                 sctp_m_freem(mm);
 4881                                         }
 4882                                 }
 4883                         }
 4884                         if ((ch->chunk_type & 0x80) == 0) {
 4885                                 /* discard this packet */
 4886                                 *offset = length;
 4887                                 return (stcb);
 4888                         }       /* else skip this bad chunk and continue... */
 4889                         break;
 4890                 }               /* switch (ch->chunk_type) */
 4891 
 4892 
 4893 next_chunk:
 4894                 /* get the next chunk */
 4895                 *offset += SCTP_SIZE32(chk_length);
 4896                 if (*offset >= length) {
 4897                         /* no more data left in the mbuf chain */
 4898                         break;
 4899                 }
 4900                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4901                     sizeof(struct sctp_chunkhdr), chunk_buf);
 4902                 if (ch == NULL) {
 4903                         if (locked_tcb) {
 4904                                 SCTP_TCB_UNLOCK(locked_tcb);
 4905                         }
 4906                         *offset = length;
 4907                         return (NULL);
 4908                 }
 4909         }                       /* while */
 4910 
 4911         if (asconf_cnt > 0 && stcb != NULL) {
 4912                 sctp_send_asconf_ack(stcb);
 4913         }
 4914         return (stcb);
 4915 }
 4916 
 4917 
 4918 /*
 4919  * Process the ECN bits we have something set so we must look to see if it is
 4920  * ECN(0) or ECN(1) or CE
 4921  */
 4922 static void
 4923 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net,
 4924     uint8_t ecn_bits)
 4925 {
 4926         if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
 4927                 ;
 4928         } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) {
 4929                 /*
 4930                  * we only add to the nonce sum for ECT1, ECT0 does not
 4931                  * change the NS bit (that we have yet to find a way to send
 4932                  * it yet).
 4933                  */
 4934 
 4935                 /* ECN Nonce stuff */
 4936                 stcb->asoc.receiver_nonce_sum++;
 4937                 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM;
 4938 
 4939                 /*
 4940                  * Drag up the last_echo point if cumack is larger since we
 4941                  * don't want the point falling way behind by more than
 4942                  * 2^^31 and then having it be incorrect.
 4943                  */
 4944                 if (compare_with_wrap(stcb->asoc.cumulative_tsn,
 4945                     stcb->asoc.last_echo_tsn, MAX_TSN)) {
 4946                         stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
 4947                 }
 4948         } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) {
 4949                 /*
 4950                  * Drag up the last_echo point if cumack is larger since we
 4951                  * don't want the point falling way behind by more than
 4952                  * 2^^31 and then having it be incorrect.
 4953                  */
 4954                 if (compare_with_wrap(stcb->asoc.cumulative_tsn,
 4955                     stcb->asoc.last_echo_tsn, MAX_TSN)) {
 4956                         stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
 4957                 }
 4958         }
 4959 }
 4960 
 4961 static void
 4962 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net,
 4963     uint32_t high_tsn, uint8_t ecn_bits)
 4964 {
 4965         if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
 4966                 /*
 4967                  * we possibly must notify the sender that a congestion
 4968                  * window reduction is in order. We do this by adding a ECNE
 4969                  * chunk to the output chunk queue. The incoming CWR will
 4970                  * remove this chunk.
 4971                  */
 4972                 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn,
 4973                     MAX_TSN)) {
 4974                         /* Yep, we need to add a ECNE */
 4975                         sctp_send_ecn_echo(stcb, net, high_tsn);
 4976                         stcb->asoc.last_echo_tsn = high_tsn;
 4977                 }
 4978         }
 4979 }
 4980 
 4981 #ifdef INVARIANTS
 4982 static void
 4983 sctp_validate_no_locks(struct sctp_inpcb *inp)
 4984 {
 4985         struct sctp_tcb *stcb;
 4986 
 4987         LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
 4988                 if (mtx_owned(&stcb->tcb_mtx)) {
 4989                         panic("Own lock on stcb at return from input");
 4990                 }
 4991         }
 4992 }
 4993 
 4994 #endif
 4995 
 4996 /*
 4997  * common input chunk processing (v4 and v6)
 4998  */
 4999 void
 5000 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
 5001     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
 5002     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
 5003     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
 5004 {
 5005         /*
 5006          * Control chunk processing
 5007          */
 5008         uint32_t high_tsn;
 5009         int fwd_tsn_seen = 0, data_processed = 0;
 5010         struct mbuf *m = *mm;
 5011         int abort_flag = 0;
 5012         int un_sent;
 5013 
 5014         SCTP_STAT_INCR(sctps_recvdatagrams);
 5015 #ifdef SCTP_AUDITING_ENABLED
 5016         sctp_audit_log(0xE0, 1);
 5017         sctp_auditing(0, inp, stcb, net);
 5018 #endif
 5019 
 5020         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
 5021             m, iphlen, offset, length, stcb);
 5022         if (stcb) {
 5023                 /* always clear this before beginning a packet */
 5024                 stcb->asoc.authenticated = 0;
 5025                 stcb->asoc.seen_a_sack_this_pkt = 0;
 5026                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
 5027                     stcb, stcb->asoc.state);
 5028 
 5029                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
 5030                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
 5031                         /*-
 5032                          * If we hit here, we had a ref count
 5033                          * up when the assoc was aborted and the
 5034                          * timer is clearing out the assoc, we should
 5035                          * NOT respond to any packet.. its OOTB.
 5036                          */
 5037                         SCTP_TCB_UNLOCK(stcb);
 5038                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
 5039                             vrf_id, port);
 5040                         goto out_now;
 5041                 }
 5042         }
 5043         if (IS_SCTP_CONTROL(ch)) {
 5044                 /* process the control portion of the SCTP packet */
 5045                 /* sa_ignore NO_NULL_CHK */
 5046                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
 5047                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
 5048                 if (stcb) {
 5049                         /*
 5050                          * This covers us if the cookie-echo was there and
 5051                          * it changes our INP.
 5052                          */
 5053                         inp = stcb->sctp_ep;
 5054                         if ((net) && (port)) {
 5055                                 if (net->port == 0) {
 5056                                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
 5057                                 }
 5058                                 net->port = port;
 5059                         }
 5060                 }
 5061         } else {
 5062                 /*
 5063                  * no control chunks, so pre-process DATA chunks (these
 5064                  * checks are taken care of by control processing)
 5065                  */
 5066 
 5067                 /*
 5068                  * if DATA only packet, and auth is required, then punt...
 5069                  * can't have authenticated without any AUTH (control)
 5070                  * chunks
 5071                  */
 5072                 if ((stcb != NULL) &&
 5073                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
 5074                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
 5075                         /* "silently" ignore */
 5076                         SCTP_STAT_INCR(sctps_recvauthmissing);
 5077                         SCTP_TCB_UNLOCK(stcb);
 5078                         goto out_now;
 5079                 }
 5080                 if (stcb == NULL) {
 5081                         /* out of the blue DATA chunk */
 5082                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
 5083                             vrf_id, port);
 5084                         goto out_now;
 5085                 }
 5086                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
 5087                         /* v_tag mismatch! */
 5088                         SCTP_STAT_INCR(sctps_badvtag);
 5089                         SCTP_TCB_UNLOCK(stcb);
 5090                         goto out_now;
 5091                 }
 5092         }
 5093 
 5094         if (stcb == NULL) {
 5095                 /*
 5096                  * no valid TCB for this packet, or we found it's a bad
 5097                  * packet while processing control, or we're done with this
 5098                  * packet (done or skip rest of data), so we drop it...
 5099                  */
 5100                 goto out_now;
 5101         }
 5102         /*
 5103          * DATA chunk processing
 5104          */
 5105         /* plow through the data chunks while length > offset */
 5106 
 5107         /*
 5108          * Rest should be DATA only.  Check authentication state if AUTH for
 5109          * DATA is required.
 5110          */
 5111         if ((length > offset) &&
 5112             (stcb != NULL) &&
 5113             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
 5114             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
 5115             !stcb->asoc.authenticated) {
 5116                 /* "silently" ignore */
 5117                 SCTP_STAT_INCR(sctps_recvauthmissing);
 5118                 SCTPDBG(SCTP_DEBUG_AUTH1,
 5119                     "Data chunk requires AUTH, skipped\n");
 5120                 goto trigger_send;
 5121         }
 5122         if (length > offset) {
 5123                 int retval;
 5124 
 5125                 /*
 5126                  * First check to make sure our state is correct. We would
 5127                  * not get here unless we really did have a tag, so we don't
 5128                  * abort if this happens, just dump the chunk silently.
 5129                  */
 5130                 switch (SCTP_GET_STATE(&stcb->asoc)) {
 5131                 case SCTP_STATE_COOKIE_ECHOED:
 5132                         /*
 5133                          * we consider data with valid tags in this state
 5134                          * shows us the cookie-ack was lost. Imply it was
 5135                          * there.
 5136                          */
 5137                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5138                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5139                                     stcb->asoc.overall_error_count,
 5140                                     0,
 5141                                     SCTP_FROM_SCTP_INPUT,
 5142                                     __LINE__);
 5143                         }
 5144                         stcb->asoc.overall_error_count = 0;
 5145                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
 5146                         break;
 5147                 case SCTP_STATE_COOKIE_WAIT:
 5148                         /*
 5149                          * We consider OOTB any data sent during asoc setup.
 5150                          */
 5151                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
 5152                             vrf_id, port);
 5153                         SCTP_TCB_UNLOCK(stcb);
 5154                         goto out_now;
 5155                         /* sa_ignore NOTREACHED */
 5156                         break;
 5157                 case SCTP_STATE_EMPTY:  /* should not happen */
 5158                 case SCTP_STATE_INUSE:  /* should not happen */
 5159                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
 5160                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
 5161                 default:
 5162                         SCTP_TCB_UNLOCK(stcb);
 5163                         goto out_now;
 5164                         /* sa_ignore NOTREACHED */
 5165                         break;
 5166                 case SCTP_STATE_OPEN:
 5167                 case SCTP_STATE_SHUTDOWN_SENT:
 5168                         break;
 5169                 }
 5170                 /* take care of ECN, part 1. */
 5171                 if (stcb->asoc.ecn_allowed &&
 5172                     (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) {
 5173                         sctp_process_ecn_marked_a(stcb, net, ecn_bits);
 5174                 }
 5175                 /* plow through the data chunks while length > offset */
 5176                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
 5177                     inp, stcb, net, &high_tsn);
 5178                 if (retval == 2) {
 5179                         /*
 5180                          * The association aborted, NO UNLOCK needed since
 5181                          * the association is destroyed.
 5182                          */
 5183                         goto out_now;
 5184                 }
 5185                 data_processed = 1;
 5186                 if (retval == 0) {
 5187                         /* take care of ecn part 2. */
 5188                         if (stcb->asoc.ecn_allowed &&
 5189                             (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) {
 5190                                 sctp_process_ecn_marked_b(stcb, net, high_tsn,
 5191                                     ecn_bits);
 5192                         }
 5193                 }
 5194                 /*
 5195                  * Anything important needs to have been m_copy'ed in
 5196                  * process_data
 5197                  */
 5198         }
 5199         if ((data_processed == 0) && (fwd_tsn_seen)) {
 5200                 int was_a_gap = 0;
 5201 
 5202                 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
 5203                     stcb->asoc.cumulative_tsn, MAX_TSN)) {
 5204                         /* there was a gap before this data was processed */
 5205                         was_a_gap = 1;
 5206                 }
 5207                 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
 5208                 if (abort_flag) {
 5209                         /* Again, we aborted so NO UNLOCK needed */
 5210                         goto out_now;
 5211                 }
 5212         }
 5213         /* trigger send of any chunks in queue... */
 5214 trigger_send:
 5215 #ifdef SCTP_AUDITING_ENABLED
 5216         sctp_audit_log(0xE0, 2);
 5217         sctp_auditing(1, inp, stcb, net);
 5218 #endif
 5219         SCTPDBG(SCTP_DEBUG_INPUT1,
 5220             "Check for chunk output prw:%d tqe:%d tf=%d\n",
 5221             stcb->asoc.peers_rwnd,
 5222             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
 5223             stcb->asoc.total_flight);
 5224         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
 5225 
 5226         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) ||
 5227             ((un_sent) &&
 5228             (stcb->asoc.peers_rwnd > 0 ||
 5229             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
 5230                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
 5231                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 5232                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
 5233         }
 5234 #ifdef SCTP_AUDITING_ENABLED
 5235         sctp_audit_log(0xE0, 3);
 5236         sctp_auditing(2, inp, stcb, net);
 5237 #endif
 5238         SCTP_TCB_UNLOCK(stcb);
 5239 out_now:
 5240 #ifdef INVARIANTS
 5241         sctp_validate_no_locks(inp);
 5242 #endif
 5243         return;
 5244 }
 5245 
 5246 
 5247 void
 5248 sctp_input_with_port(i_pak, off, port)
 5249         struct mbuf *i_pak;
 5250         int off;
 5251         uint16_t port;
 5252 {
 5253 #ifdef SCTP_MBUF_LOGGING
 5254         struct mbuf *mat;
 5255 
 5256 #endif
 5257         struct mbuf *m;
 5258         int iphlen;
 5259         uint32_t vrf_id = 0;
 5260         uint8_t ecn_bits;
 5261         struct ip *ip;
 5262         struct sctphdr *sh;
 5263         struct sctp_inpcb *inp = NULL;
 5264 
 5265         uint32_t check, calc_check;
 5266         struct sctp_nets *net;
 5267         struct sctp_tcb *stcb = NULL;
 5268         struct sctp_chunkhdr *ch;
 5269         int refcount_up = 0;
 5270         int length, mlen, offset;
 5271 
 5272 
 5273         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
 5274                 SCTP_RELEASE_PKT(i_pak);
 5275                 return;
 5276         }
 5277         mlen = SCTP_HEADER_LEN(i_pak);
 5278         iphlen = off;
 5279         m = SCTP_HEADER_TO_CHAIN(i_pak);
 5280 
 5281         net = NULL;
 5282         SCTP_STAT_INCR(sctps_recvpackets);
 5283         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 5284 
 5285 
 5286 #ifdef SCTP_MBUF_LOGGING
 5287         /* Log in any input mbufs */
 5288         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 5289                 mat = m;
 5290                 while (mat) {
 5291                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 5292                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
 5293                         }
 5294                         mat = SCTP_BUF_NEXT(mat);
 5295                 }
 5296         }
 5297 #endif
 5298 #ifdef  SCTP_PACKET_LOGGING
 5299         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 5300                 sctp_packet_log(m, mlen);
 5301 #endif
 5302         /*
 5303          * Must take out the iphlen, since mlen expects this (only effect lb
 5304          * case)
 5305          */
 5306         mlen -= iphlen;
 5307 
 5308         /*
 5309          * Get IP, SCTP, and first chunk header together in first mbuf.
 5310          */
 5311         ip = mtod(m, struct ip *);
 5312         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 5313         if (SCTP_BUF_LEN(m) < offset) {
 5314                 if ((m = m_pullup(m, offset)) == 0) {
 5315                         SCTP_STAT_INCR(sctps_hdrops);
 5316                         return;
 5317                 }
 5318                 ip = mtod(m, struct ip *);
 5319         }
 5320         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
 5321         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
 5322         SCTPDBG(SCTP_DEBUG_INPUT1,
 5323             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
 5324 
 5325         /* SCTP does not allow broadcasts or multicasts */
 5326         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 5327                 goto bad;
 5328         }
 5329         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
 5330                 /*
 5331                  * We only look at broadcast if its a front state, All
 5332                  * others we will not have a tcb for anyway.
 5333                  */
 5334                 goto bad;
 5335         }
 5336         /* validate SCTP checksum */
 5337         check = sh->checksum;   /* save incoming checksum */
 5338         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
 5339             ((ip->ip_src.s_addr == ip->ip_dst.s_addr) ||
 5340             (SCTP_IS_IT_LOOPBACK(m)))
 5341             ) {
 5342                 goto sctp_skip_csum_4;
 5343         }
 5344         sh->checksum = 0;       /* prepare for calc */
 5345         calc_check = sctp_calculate_sum(m, &mlen, iphlen);
 5346         if (calc_check != check) {
 5347                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
 5348                     calc_check, check, m, mlen, iphlen);
 5349 
 5350                 stcb = sctp_findassociation_addr(m, iphlen,
 5351                     offset - sizeof(*ch),
 5352                     sh, ch, &inp, &net,
 5353                     vrf_id);
 5354                 if ((net) && (port)) {
 5355                         if (net->port == 0) {
 5356                                 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
 5357                         }
 5358                         net->port = port;
 5359                 }
 5360                 if ((inp) && (stcb)) {
 5361                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 5362                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 5363                 } else if ((inp != NULL) && (stcb == NULL)) {
 5364                         refcount_up = 1;
 5365                 }
 5366                 SCTP_STAT_INCR(sctps_badsum);
 5367                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 5368                 goto bad;
 5369         }
 5370         sh->checksum = calc_check;
 5371 sctp_skip_csum_4:
 5372         /* destination port of 0 is illegal, based on RFC2960. */
 5373         if (sh->dest_port == 0) {
 5374                 SCTP_STAT_INCR(sctps_hdrops);
 5375                 goto bad;
 5376         }
 5377         /* validate mbuf chain length with IP payload length */
 5378         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
 5379                 SCTP_STAT_INCR(sctps_hdrops);
 5380                 goto bad;
 5381         }
 5382         /*
 5383          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 5384          * IP/SCTP/first chunk header...
 5385          */
 5386         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 5387             sh, ch, &inp, &net, vrf_id);
 5388         if ((net) && (port)) {
 5389                 if (net->port == 0) {
 5390                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
 5391                 }
 5392                 net->port = port;
 5393         }
 5394         /* inp's ref-count increased && stcb locked */
 5395         if (inp == NULL) {
 5396                 struct sctp_init_chunk *init_chk, chunk_buf;
 5397 
 5398                 SCTP_STAT_INCR(sctps_noport);
 5399 #ifdef ICMP_BANDLIM
 5400                 /*
 5401                  * we use the bandwidth limiting to protect against sending
 5402                  * too many ABORTS all at once. In this case these count the
 5403                  * same as an ICMP message.
 5404                  */
 5405                 if (badport_bandlim(0) < 0)
 5406                         goto bad;
 5407 #endif                          /* ICMP_BANDLIM */
 5408                 SCTPDBG(SCTP_DEBUG_INPUT1,
 5409                     "Sending a ABORT from packet entry!\n");
 5410                 if (ch->chunk_type == SCTP_INITIATION) {
 5411                         /*
 5412                          * we do a trick here to get the INIT tag, dig in
 5413                          * and get the tag from the INIT and put it in the
 5414                          * common header.
 5415                          */
 5416                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 5417                             iphlen + sizeof(*sh), sizeof(*init_chk),
 5418                             (uint8_t *) & chunk_buf);
 5419                         if (init_chk != NULL)
 5420                                 sh->v_tag = init_chk->init.initiate_tag;
 5421                 }
 5422                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 5423                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
 5424                         goto bad;
 5425                 }
 5426                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 5427                         goto bad;
 5428                 }
 5429                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
 5430                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 5431                 goto bad;
 5432         } else if (stcb == NULL) {
 5433                 refcount_up = 1;
 5434         }
 5435 #ifdef IPSEC
 5436         /*
 5437          * I very much doubt any of the IPSEC stuff will work but I have no
 5438          * idea, so I will leave it in place.
 5439          */
 5440         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
 5441                 MODULE_GLOBAL(MOD_IPSEC, ipsec4stat).in_polvio++;
 5442                 SCTP_STAT_INCR(sctps_hdrops);
 5443                 goto bad;
 5444         }
 5445 #endif                          /* IPSEC */
 5446 
 5447         /*
 5448          * common chunk processing
 5449          */
 5450         length = ip->ip_len + iphlen;
 5451         offset -= sizeof(struct sctp_chunkhdr);
 5452 
 5453         ecn_bits = ip->ip_tos;
 5454 
 5455         /* sa_ignore NO_NULL_CHK */
 5456         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 5457             inp, stcb, net, ecn_bits, vrf_id, port);
 5458         /* inp's ref-count reduced && stcb unlocked */
 5459         if (m) {
 5460                 sctp_m_freem(m);
 5461         }
 5462         if ((inp) && (refcount_up)) {
 5463                 /* reduce ref-count */
 5464                 SCTP_INP_DECR_REF(inp);
 5465         }
 5466         return;
 5467 bad:
 5468         if (stcb) {
 5469                 SCTP_TCB_UNLOCK(stcb);
 5470         }
 5471         if ((inp) && (refcount_up)) {
 5472                 /* reduce ref-count */
 5473                 SCTP_INP_DECR_REF(inp);
 5474         }
 5475         if (m) {
 5476                 sctp_m_freem(m);
 5477         }
 5478         return;
 5479 }
 5480 void
 5481 sctp_input(i_pak, off)
 5482         struct mbuf *i_pak;
 5483         int off;
 5484 {
 5485         sctp_input_with_port(i_pak, off, 0);
 5486 }

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