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) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/10.3/sys/netinet/sctp_input.c 296052 2016-02-25 18:46:06Z tuexen $");
   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/sctp_crc32.h>
   50 #if defined(INET) || defined(INET6)
   51 #include <netinet/udp.h>
   52 #endif
   53 #include <sys/smp.h>
   54 
   55 
   56 
   57 static void
   58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
   59 {
   60         struct sctp_nets *net;
   61 
   62         /*
   63          * This now not only stops all cookie timers it also stops any INIT
   64          * timers as well. This will make sure that the timers are stopped
   65          * in all collision cases.
   66          */
   67         SCTP_TCB_LOCK_ASSERT(stcb);
   68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
   69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
   70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
   71                             stcb->sctp_ep,
   72                             stcb,
   73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
   74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
   75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
   76                             stcb->sctp_ep,
   77                             stcb,
   78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
   79                 }
   80         }
   81 }
   82 
   83 /* INIT handler */
   84 static void
   85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
   86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
   87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
   88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
   89     uint8_t mflowtype, uint32_t mflowid,
   90     uint32_t vrf_id, uint16_t port)
   91 {
   92         struct sctp_init *init;
   93         struct mbuf *op_err;
   94 
   95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
   96             (void *)stcb);
   97         if (stcb == NULL) {
   98                 SCTP_INP_RLOCK(inp);
   99         }
  100         /* validate length */
  101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
  102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  104                     mflowtype, mflowid,
  105                     vrf_id, port);
  106                 if (stcb)
  107                         *abort_no_unlock = 1;
  108                 goto outnow;
  109         }
  110         /* validate parameters */
  111         init = &cp->init;
  112         if (init->initiate_tag == 0) {
  113                 /* protocol error... send abort */
  114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  116                     mflowtype, mflowid,
  117                     vrf_id, port);
  118                 if (stcb)
  119                         *abort_no_unlock = 1;
  120                 goto outnow;
  121         }
  122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
  123                 /* invalid parameter... send abort */
  124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  126                     mflowtype, mflowid,
  127                     vrf_id, port);
  128                 if (stcb)
  129                         *abort_no_unlock = 1;
  130                 goto outnow;
  131         }
  132         if (init->num_inbound_streams == 0) {
  133                 /* protocol error... send abort */
  134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  136                     mflowtype, mflowid,
  137                     vrf_id, port);
  138                 if (stcb)
  139                         *abort_no_unlock = 1;
  140                 goto outnow;
  141         }
  142         if (init->num_outbound_streams == 0) {
  143                 /* protocol error... send abort */
  144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  146                     mflowtype, mflowid,
  147                     vrf_id, port);
  148                 if (stcb)
  149                         *abort_no_unlock = 1;
  150                 goto outnow;
  151         }
  152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
  153             offset + ntohs(cp->ch.chunk_length))) {
  154                 /* auth parameter(s) error... send abort */
  155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  156                     "Problem with AUTH parameters");
  157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  158                     mflowtype, mflowid,
  159                     vrf_id, port);
  160                 if (stcb)
  161                         *abort_no_unlock = 1;
  162                 goto outnow;
  163         }
  164         /*
  165          * We are only accepting if we have a socket with positive
  166          * so_qlimit.
  167          */
  168         if ((stcb == NULL) &&
  169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
  170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
  171             (inp->sctp_socket == NULL) ||
  172             (inp->sctp_socket->so_qlimit == 0))) {
  173                 /*
  174                  * FIX ME ?? What about TCP model and we have a
  175                  * match/restart case? Actually no fix is needed. the lookup
  176                  * will always find the existing assoc so stcb would not be
  177                  * NULL. It may be questionable to do this since we COULD
  178                  * just send back the INIT-ACK and hope that the app did
  179                  * accept()'s by the time the COOKIE was sent. But there is
  180                  * a price to pay for COOKIE generation and I don't want to
  181                  * pay it on the chance that the app will actually do some
  182                  * accepts(). The App just looses and should NOT be in this
  183                  * state :-)
  184                  */
  185                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
  186                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  187                             "No listener");
  188                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
  189                             mflowtype, mflowid, inp->fibnum,
  190                             vrf_id, port);
  191                 }
  192                 goto outnow;
  193         }
  194         if ((stcb != NULL) &&
  195             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
  196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
  197                 sctp_send_shutdown_ack(stcb, NULL);
  198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
  199         } else {
  200                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
  201                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
  202                     src, dst, sh, cp,
  203                     mflowtype, mflowid,
  204                     vrf_id, port,
  205                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
  206         }
  207 outnow:
  208         if (stcb == NULL) {
  209                 SCTP_INP_RUNLOCK(inp);
  210         }
  211 }
  212 
  213 /*
  214  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
  215  */
  216 
  217 int
  218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
  219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
  220     SCTP_UNUSED
  221 #endif
  222 )
  223 {
  224         int unsent_data = 0;
  225         unsigned int i;
  226         struct sctp_stream_queue_pending *sp;
  227         struct sctp_association *asoc;
  228 
  229         /*
  230          * This function returns the number of streams that have true unsent
  231          * data on them. Note that as it looks through it will clean up any
  232          * places that have old data that has been sent but left at top of
  233          * stream queue.
  234          */
  235         asoc = &stcb->asoc;
  236         SCTP_TCB_SEND_LOCK(stcb);
  237         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
  238                 /* Check to see if some data queued */
  239                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
  240                         /* sa_ignore FREED_MEMORY */
  241                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
  242                         if (sp == NULL) {
  243                                 continue;
  244                         }
  245                         if ((sp->msg_is_complete) &&
  246                             (sp->length == 0) &&
  247                             (sp->sender_all_done)) {
  248                                 /*
  249                                  * We are doing differed cleanup. Last time
  250                                  * through when we took all the data the
  251                                  * sender_all_done was not set.
  252                                  */
  253                                 if (sp->put_last_out == 0) {
  254                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
  255                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
  256                                             sp->sender_all_done,
  257                                             sp->length,
  258                                             sp->msg_is_complete,
  259                                             sp->put_last_out);
  260                                 }
  261                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
  262                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
  263                                 if (sp->net) {
  264                                         sctp_free_remote_addr(sp->net);
  265                                         sp->net = NULL;
  266                                 }
  267                                 if (sp->data) {
  268                                         sctp_m_freem(sp->data);
  269                                         sp->data = NULL;
  270                                 }
  271                                 sctp_free_a_strmoq(stcb, sp, so_locked);
  272                         } else {
  273                                 unsent_data++;
  274                                 break;
  275                         }
  276                 }
  277         }
  278         SCTP_TCB_SEND_UNLOCK(stcb);
  279         return (unsent_data);
  280 }
  281 
  282 static int
  283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
  284 {
  285         struct sctp_init *init;
  286         struct sctp_association *asoc;
  287         struct sctp_nets *lnet;
  288         unsigned int i;
  289 
  290         init = &cp->init;
  291         asoc = &stcb->asoc;
  292         /* save off parameters */
  293         asoc->peer_vtag = ntohl(init->initiate_tag);
  294         asoc->peers_rwnd = ntohl(init->a_rwnd);
  295         /* init tsn's */
  296         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
  297 
  298         if (!TAILQ_EMPTY(&asoc->nets)) {
  299                 /* update any ssthresh's that may have a default */
  300                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
  301                         lnet->ssthresh = asoc->peers_rwnd;
  302                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
  303                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
  304                         }
  305                 }
  306         }
  307         SCTP_TCB_SEND_LOCK(stcb);
  308         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
  309                 unsigned int newcnt;
  310                 struct sctp_stream_out *outs;
  311                 struct sctp_stream_queue_pending *sp, *nsp;
  312                 struct sctp_tmit_chunk *chk, *nchk;
  313 
  314                 /* abandon the upper streams */
  315                 newcnt = ntohs(init->num_inbound_streams);
  316                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
  317                         if (chk->rec.data.stream_number >= newcnt) {
  318                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
  319                                 asoc->send_queue_cnt--;
  320                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
  321                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
  322 #ifdef INVARIANTS
  323                                 } else {
  324                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
  325 #endif
  326                                 }
  327                                 if (chk->data != NULL) {
  328                                         sctp_free_bufspace(stcb, asoc, chk, 1);
  329                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
  330                                             0, chk, SCTP_SO_NOT_LOCKED);
  331                                         if (chk->data) {
  332                                                 sctp_m_freem(chk->data);
  333                                                 chk->data = NULL;
  334                                         }
  335                                 }
  336                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  337                                 /* sa_ignore FREED_MEMORY */
  338                         }
  339                 }
  340                 if (asoc->strmout) {
  341                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
  342                                 outs = &asoc->strmout[i];
  343                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
  344                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
  345                                         asoc->stream_queue_cnt--;
  346                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
  347                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
  348                                         if (sp->data) {
  349                                                 sctp_m_freem(sp->data);
  350                                                 sp->data = NULL;
  351                                         }
  352                                         if (sp->net) {
  353                                                 sctp_free_remote_addr(sp->net);
  354                                                 sp->net = NULL;
  355                                         }
  356                                         /* Free the chunk */
  357                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
  358                                         /* sa_ignore FREED_MEMORY */
  359                                 }
  360                                 outs->state = SCTP_STREAM_CLOSED;
  361                         }
  362                 }
  363                 /* cut back the count */
  364                 asoc->pre_open_streams = newcnt;
  365         }
  366         SCTP_TCB_SEND_UNLOCK(stcb);
  367         asoc->streamoutcnt = asoc->pre_open_streams;
  368         if (asoc->strmout) {
  369                 for (i = 0; i < asoc->streamoutcnt; i++) {
  370                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
  371                 }
  372         }
  373         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
  374         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
  375         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
  376                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
  377         }
  378         /* This is the next one we expect */
  379         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
  380 
  381         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
  382         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
  383 
  384         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
  385         /* open the requested streams */
  386 
  387         if (asoc->strmin != NULL) {
  388                 /* Free the old ones */
  389                 struct sctp_queued_to_read *ctl, *nctl;
  390 
  391                 for (i = 0; i < asoc->streamincnt; i++) {
  392                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
  393                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
  394                                 sctp_free_remote_addr(ctl->whoFrom);
  395                                 ctl->whoFrom = NULL;
  396                                 sctp_m_freem(ctl->data);
  397                                 ctl->data = NULL;
  398                                 sctp_free_a_readq(stcb, ctl);
  399                         }
  400                 }
  401                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
  402         }
  403         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
  404                 asoc->streamincnt = ntohs(init->num_outbound_streams);
  405         } else {
  406                 asoc->streamincnt = asoc->max_inbound_streams;
  407         }
  408         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
  409             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
  410         if (asoc->strmin == NULL) {
  411                 /* we didn't get memory for the streams! */
  412                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
  413                 return (-1);
  414         }
  415         for (i = 0; i < asoc->streamincnt; i++) {
  416                 asoc->strmin[i].stream_no = i;
  417                 asoc->strmin[i].last_sequence_delivered = 0xffff;
  418                 TAILQ_INIT(&asoc->strmin[i].inqueue);
  419                 asoc->strmin[i].delivery_started = 0;
  420         }
  421         /*
  422          * load_address_from_init will put the addresses into the
  423          * association when the COOKIE is processed or the INIT-ACK is
  424          * processed. Both types of COOKIE's existing and new call this
  425          * routine. It will remove addresses that are no longer in the
  426          * association (for the restarting case where addresses are
  427          * removed). Up front when the INIT arrives we will discard it if it
  428          * is a restart and new addresses have been added.
  429          */
  430         /* sa_ignore MEMLEAK */
  431         return (0);
  432 }
  433 
  434 /*
  435  * INIT-ACK message processing/consumption returns value < 0 on error
  436  */
  437 static int
  438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
  439     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  440     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
  441     struct sctp_nets *net, int *abort_no_unlock,
  442     uint8_t mflowtype, uint32_t mflowid,
  443     uint32_t vrf_id)
  444 {
  445         struct sctp_association *asoc;
  446         struct mbuf *op_err;
  447         int retval, abort_flag;
  448         uint32_t initack_limit;
  449         int nat_friendly = 0;
  450 
  451         /* First verify that we have no illegal param's */
  452         abort_flag = 0;
  453 
  454         op_err = sctp_arethere_unrecognized_parameters(m,
  455             (offset + sizeof(struct sctp_init_chunk)),
  456             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
  457         if (abort_flag) {
  458                 /* Send an abort and notify peer */
  459                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
  460                 *abort_no_unlock = 1;
  461                 return (-1);
  462         }
  463         asoc = &stcb->asoc;
  464         asoc->peer_supports_nat = (uint8_t) nat_friendly;
  465         /* process the peer's parameters in the INIT-ACK */
  466         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
  467         if (retval < 0) {
  468                 return (retval);
  469         }
  470         initack_limit = offset + ntohs(cp->ch.chunk_length);
  471         /* load all addresses */
  472         if ((retval = sctp_load_addresses_from_init(stcb, m,
  473             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
  474             src, dst, NULL))) {
  475                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  476                     "Problem with address parameters");
  477                 SCTPDBG(SCTP_DEBUG_INPUT1,
  478                     "Load addresses from INIT causes an abort %d\n",
  479                     retval);
  480                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
  481                     src, dst, sh, op_err,
  482                     mflowtype, mflowid,
  483                     vrf_id, net->port);
  484                 *abort_no_unlock = 1;
  485                 return (-1);
  486         }
  487         /* if the peer doesn't support asconf, flush the asconf queue */
  488         if (asoc->asconf_supported == 0) {
  489                 struct sctp_asconf_addr *param, *nparam;
  490 
  491                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
  492                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
  493                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
  494                 }
  495         }
  496         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
  497             stcb->asoc.local_hmacs);
  498         if (op_err) {
  499                 sctp_queue_op_err(stcb, op_err);
  500                 /* queuing will steal away the mbuf chain to the out queue */
  501                 op_err = NULL;
  502         }
  503         /* extract the cookie and queue it to "echo" it back... */
  504         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  505                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
  506                     stcb->asoc.overall_error_count,
  507                     0,
  508                     SCTP_FROM_SCTP_INPUT,
  509                     __LINE__);
  510         }
  511         stcb->asoc.overall_error_count = 0;
  512         net->error_count = 0;
  513 
  514         /*
  515          * Cancel the INIT timer, We do this first before queueing the
  516          * cookie. We always cancel at the primary to assue that we are
  517          * canceling the timer started by the INIT which always goes to the
  518          * primary.
  519          */
  520         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
  521             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
  522 
  523         /* calculate the RTO */
  524         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
  525             SCTP_RTT_FROM_NON_DATA);
  526         retval = sctp_send_cookie_echo(m, offset, stcb, net);
  527         if (retval < 0) {
  528                 /*
  529                  * No cookie, we probably should send a op error. But in any
  530                  * case if there is no cookie in the INIT-ACK, we can
  531                  * abandon the peer, its broke.
  532                  */
  533                 if (retval == -3) {
  534                         uint16_t len;
  535 
  536                         len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
  537                         /* We abort with an error of missing mandatory param */
  538                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
  539                         if (op_err != NULL) {
  540                                 struct sctp_error_missing_param *cause;
  541 
  542                                 SCTP_BUF_LEN(op_err) = len;
  543                                 cause = mtod(op_err, struct sctp_error_missing_param *);
  544                                 /* Subtract the reserved param */
  545                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
  546                                 cause->cause.length = htons(len);
  547                                 cause->num_missing_params = htonl(1);
  548                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
  549                         }
  550                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
  551                             src, dst, sh, op_err,
  552                             mflowtype, mflowid,
  553                             vrf_id, net->port);
  554                         *abort_no_unlock = 1;
  555                 }
  556                 return (retval);
  557         }
  558         return (0);
  559 }
  560 
  561 static void
  562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
  563     struct sctp_tcb *stcb, struct sctp_nets *net)
  564 {
  565         union sctp_sockstore store;
  566         struct sctp_nets *r_net, *f_net;
  567         struct timeval tv;
  568         int req_prim = 0;
  569         uint16_t old_error_counter;
  570 
  571         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
  572                 /* Invalid length */
  573                 return;
  574         }
  575         memset(&store, 0, sizeof(store));
  576         switch (cp->heartbeat.hb_info.addr_family) {
  577 #ifdef INET
  578         case AF_INET:
  579                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
  580                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
  581                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
  582                         store.sin.sin_port = stcb->rport;
  583                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
  584                             sizeof(store.sin.sin_addr));
  585                 } else {
  586                         return;
  587                 }
  588                 break;
  589 #endif
  590 #ifdef INET6
  591         case AF_INET6:
  592                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
  593                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
  594                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
  595                         store.sin6.sin6_port = stcb->rport;
  596                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
  597                 } else {
  598                         return;
  599                 }
  600                 break;
  601 #endif
  602         default:
  603                 return;
  604         }
  605         r_net = sctp_findnet(stcb, &store.sa);
  606         if (r_net == NULL) {
  607                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
  608                 return;
  609         }
  610         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  611             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
  612             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
  613                 /*
  614                  * If the its a HB and it's random value is correct when can
  615                  * confirm the destination.
  616                  */
  617                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
  618                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
  619                         stcb->asoc.primary_destination = r_net;
  620                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  621                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
  622                         if (f_net != r_net) {
  623                                 /*
  624                                  * first one on the list is NOT the primary
  625                                  * sctp_cmpaddr() is much more efficent if
  626                                  * the primary is the first on the list,
  627                                  * make it so.
  628                                  */
  629                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
  630                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
  631                         }
  632                         req_prim = 1;
  633                 }
  634                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
  635                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
  636                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
  637                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
  638                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
  639         }
  640         old_error_counter = r_net->error_count;
  641         r_net->error_count = 0;
  642         r_net->hb_responded = 1;
  643         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
  644         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
  645         /* Now lets do a RTO with this */
  646         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
  647             SCTP_RTT_FROM_NON_DATA);
  648         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
  649                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
  650                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
  651                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
  652         }
  653         if (r_net->dest_state & SCTP_ADDR_PF) {
  654                 r_net->dest_state &= ~SCTP_ADDR_PF;
  655                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
  656         }
  657         if (old_error_counter > 0) {
  658                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
  659                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
  660                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
  661         }
  662         if (r_net == stcb->asoc.primary_destination) {
  663                 if (stcb->asoc.alternate) {
  664                         /* release the alternate, primary is good */
  665                         sctp_free_remote_addr(stcb->asoc.alternate);
  666                         stcb->asoc.alternate = NULL;
  667                 }
  668         }
  669         /* Mobility adaptation */
  670         if (req_prim) {
  671                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
  672                     SCTP_MOBILITY_BASE) ||
  673                     sctp_is_mobility_feature_on(stcb->sctp_ep,
  674                     SCTP_MOBILITY_FASTHANDOFF)) &&
  675                     sctp_is_mobility_feature_on(stcb->sctp_ep,
  676                     SCTP_MOBILITY_PRIM_DELETED)) {
  677 
  678                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
  679                             stcb->sctp_ep, stcb, NULL,
  680                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
  681                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
  682                             SCTP_MOBILITY_FASTHANDOFF)) {
  683                                 sctp_assoc_immediate_retrans(stcb,
  684                                     stcb->asoc.primary_destination);
  685                         }
  686                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
  687                             SCTP_MOBILITY_BASE)) {
  688                                 sctp_move_chunks_from_net(stcb,
  689                                     stcb->asoc.deleted_primary);
  690                         }
  691                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
  692                             stcb->asoc.deleted_primary);
  693                 }
  694         }
  695 }
  696 
  697 static int
  698 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
  699 {
  700         /*
  701          * return 0 means we want you to proceed with the abort non-zero
  702          * means no abort processing
  703          */
  704         struct sctpasochead *head;
  705 
  706         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
  707                 /* generate a new vtag and send init */
  708                 LIST_REMOVE(stcb, sctp_asocs);
  709                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
  710                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
  711                 /*
  712                  * put it in the bucket in the vtag hash of assoc's for the
  713                  * system
  714                  */
  715                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
  716                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
  717                 return (1);
  718         }
  719         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  720                 /*
  721                  * treat like a case where the cookie expired i.e.: - dump
  722                  * current cookie. - generate a new vtag. - resend init.
  723                  */
  724                 /* generate a new vtag and send init */
  725                 LIST_REMOVE(stcb, sctp_asocs);
  726                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
  727                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
  728                 sctp_stop_all_cookie_timers(stcb);
  729                 sctp_toss_old_cookies(stcb, &stcb->asoc);
  730                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
  731                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
  732                 /*
  733                  * put it in the bucket in the vtag hash of assoc's for the
  734                  * system
  735                  */
  736                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
  737                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
  738                 return (1);
  739         }
  740         return (0);
  741 }
  742 
  743 static int
  744 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
  745     struct sctp_nets *net)
  746 {
  747         /*
  748          * return 0 means we want you to proceed with the abort non-zero
  749          * means no abort processing
  750          */
  751         if (stcb->asoc.auth_supported == 0) {
  752                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
  753                 return (0);
  754         }
  755         sctp_asconf_send_nat_state_update(stcb, net);
  756         return (1);
  757 }
  758 
  759 
  760 static void
  761 sctp_handle_abort(struct sctp_abort_chunk *abort,
  762     struct sctp_tcb *stcb, struct sctp_nets *net)
  763 {
  764 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  765         struct socket *so;
  766 
  767 #endif
  768         uint16_t len;
  769         uint16_t error;
  770 
  771         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
  772         if (stcb == NULL)
  773                 return;
  774 
  775         len = ntohs(abort->ch.chunk_length);
  776         if (len > sizeof(struct sctp_chunkhdr)) {
  777                 /*
  778                  * Need to check the cause codes for our two magic nat
  779                  * aborts which don't kill the assoc necessarily.
  780                  */
  781                 struct sctp_gen_error_cause *cause;
  782 
  783                 cause = (struct sctp_gen_error_cause *)(abort + 1);
  784                 error = ntohs(cause->code);
  785                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
  786                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
  787                             abort->ch.chunk_flags);
  788                         if (sctp_handle_nat_colliding_state(stcb)) {
  789                                 return;
  790                         }
  791                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
  792                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
  793                             abort->ch.chunk_flags);
  794                         if (sctp_handle_nat_missing_state(stcb, net)) {
  795                                 return;
  796                         }
  797                 }
  798         } else {
  799                 error = 0;
  800         }
  801         /* stop any receive timers */
  802         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
  803             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
  804         /* notify user of the abort and clean up... */
  805         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
  806         /* free the tcb */
  807         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
  808         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
  809             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  810                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  811         }
  812 #ifdef SCTP_ASOCLOG_OF_TSNS
  813         sctp_print_out_track_log(stcb);
  814 #endif
  815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  816         so = SCTP_INP_SO(stcb->sctp_ep);
  817         atomic_add_int(&stcb->asoc.refcnt, 1);
  818         SCTP_TCB_UNLOCK(stcb);
  819         SCTP_SOCKET_LOCK(so, 1);
  820         SCTP_TCB_LOCK(stcb);
  821         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  822 #endif
  823         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
  824         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
  825             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
  826 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  827         SCTP_SOCKET_UNLOCK(so, 1);
  828 #endif
  829         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
  830 }
  831 
  832 static void
  833 sctp_start_net_timers(struct sctp_tcb *stcb)
  834 {
  835         uint32_t cnt_hb_sent;
  836         struct sctp_nets *net;
  837 
  838         cnt_hb_sent = 0;
  839         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  840                 /*
  841                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
  842                  * If the dest in unconfirmed send a hb as well if under
  843                  * max_hb_burst have been sent.
  844                  */
  845                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
  846                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
  847                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
  848                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
  849                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  850                         cnt_hb_sent++;
  851                 }
  852         }
  853         if (cnt_hb_sent) {
  854                 sctp_chunk_output(stcb->sctp_ep, stcb,
  855                     SCTP_OUTPUT_FROM_COOKIE_ACK,
  856                     SCTP_SO_NOT_LOCKED);
  857         }
  858 }
  859 
  860 
  861 static void
  862 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
  863     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
  864 {
  865         struct sctp_association *asoc;
  866         int some_on_streamwheel;
  867         int old_state;
  868 
  869 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  870         struct socket *so;
  871 
  872 #endif
  873 
  874         SCTPDBG(SCTP_DEBUG_INPUT2,
  875             "sctp_handle_shutdown: handling SHUTDOWN\n");
  876         if (stcb == NULL)
  877                 return;
  878         asoc = &stcb->asoc;
  879         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
  880             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
  881                 return;
  882         }
  883         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
  884                 /* Shutdown NOT the expected size */
  885                 return;
  886         }
  887         old_state = SCTP_GET_STATE(asoc);
  888         sctp_update_acked(stcb, cp, abort_flag);
  889         if (*abort_flag) {
  890                 return;
  891         }
  892         if (asoc->control_pdapi) {
  893                 /*
  894                  * With a normal shutdown we assume the end of last record.
  895                  */
  896                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
  897                 asoc->control_pdapi->end_added = 1;
  898                 asoc->control_pdapi->pdapi_aborted = 1;
  899                 asoc->control_pdapi = NULL;
  900                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
  901 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  902                 so = SCTP_INP_SO(stcb->sctp_ep);
  903                 atomic_add_int(&stcb->asoc.refcnt, 1);
  904                 SCTP_TCB_UNLOCK(stcb);
  905                 SCTP_SOCKET_LOCK(so, 1);
  906                 SCTP_TCB_LOCK(stcb);
  907                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  908                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
  909                         /* assoc was freed while we were unlocked */
  910                         SCTP_SOCKET_UNLOCK(so, 1);
  911                         return;
  912                 }
  913 #endif
  914                 if (stcb->sctp_socket) {
  915                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
  916                 }
  917 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  918                 SCTP_SOCKET_UNLOCK(so, 1);
  919 #endif
  920         }
  921         /* goto SHUTDOWN_RECEIVED state to block new requests */
  922         if (stcb->sctp_socket) {
  923                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
  924                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
  925                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
  926                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
  927                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  928                         /*
  929                          * notify upper layer that peer has initiated a
  930                          * shutdown
  931                          */
  932                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
  933 
  934                         /* reset time */
  935                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
  936                 }
  937         }
  938         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
  939                 /*
  940                  * stop the shutdown timer, since we WILL move to
  941                  * SHUTDOWN-ACK-SENT.
  942                  */
  943                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
  944                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
  945         }
  946         /* Now is there unsent data on a stream somewhere? */
  947         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
  948 
  949         if (!TAILQ_EMPTY(&asoc->send_queue) ||
  950             !TAILQ_EMPTY(&asoc->sent_queue) ||
  951             some_on_streamwheel) {
  952                 /* By returning we will push more data out */
  953                 return;
  954         } else {
  955                 /* no outstanding data to send, so move on... */
  956                 /* send SHUTDOWN-ACK */
  957                 /* move to SHUTDOWN-ACK-SENT state */
  958                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
  959                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  960                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  961                 }
  962                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  963                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
  964                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
  965                         sctp_stop_timers_for_shutdown(stcb);
  966                         sctp_send_shutdown_ack(stcb, net);
  967                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
  968                             stcb->sctp_ep, stcb, net);
  969                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
  970                         sctp_send_shutdown_ack(stcb, net);
  971                 }
  972         }
  973 }
  974 
  975 static void
  976 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
  977     struct sctp_tcb *stcb,
  978     struct sctp_nets *net)
  979 {
  980         struct sctp_association *asoc;
  981 
  982 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  983         struct socket *so;
  984 
  985         so = SCTP_INP_SO(stcb->sctp_ep);
  986 #endif
  987         SCTPDBG(SCTP_DEBUG_INPUT2,
  988             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
  989         if (stcb == NULL)
  990                 return;
  991 
  992         asoc = &stcb->asoc;
  993         /* process according to association state */
  994         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
  995             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
  996                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
  997                 sctp_send_shutdown_complete(stcb, net, 1);
  998                 SCTP_TCB_UNLOCK(stcb);
  999                 return;
 1000         }
 1001         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 1002             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 1003                 /* unexpected SHUTDOWN-ACK... so ignore... */
 1004                 SCTP_TCB_UNLOCK(stcb);
 1005                 return;
 1006         }
 1007         if (asoc->control_pdapi) {
 1008                 /*
 1009                  * With a normal shutdown we assume the end of last record.
 1010                  */
 1011                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 1012                 asoc->control_pdapi->end_added = 1;
 1013                 asoc->control_pdapi->pdapi_aborted = 1;
 1014                 asoc->control_pdapi = NULL;
 1015                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1017                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1018                 SCTP_TCB_UNLOCK(stcb);
 1019                 SCTP_SOCKET_LOCK(so, 1);
 1020                 SCTP_TCB_LOCK(stcb);
 1021                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1022                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1023                         /* assoc was freed while we were unlocked */
 1024                         SCTP_SOCKET_UNLOCK(so, 1);
 1025                         return;
 1026                 }
 1027 #endif
 1028                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 1029 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1030                 SCTP_SOCKET_UNLOCK(so, 1);
 1031 #endif
 1032         }
 1033 #ifdef INVARIANTS
 1034         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 1035             !TAILQ_EMPTY(&asoc->sent_queue) ||
 1036             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 1037                 panic("Queues are not empty when handling SHUTDOWN-ACK");
 1038         }
 1039 #endif
 1040         /* stop the timer */
 1041         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
 1042             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 1043         /* send SHUTDOWN-COMPLETE */
 1044         sctp_send_shutdown_complete(stcb, net, 0);
 1045         /* notify upper layer protocol */
 1046         if (stcb->sctp_socket) {
 1047                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1048                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 1049                         stcb->sctp_socket->so_snd.sb_cc = 0;
 1050                 }
 1051                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 1052         }
 1053         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 1054         /* free the TCB but first save off the ep */
 1055 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1056         atomic_add_int(&stcb->asoc.refcnt, 1);
 1057         SCTP_TCB_UNLOCK(stcb);
 1058         SCTP_SOCKET_LOCK(so, 1);
 1059         SCTP_TCB_LOCK(stcb);
 1060         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1061 #endif
 1062         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 1063             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
 1064 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1065         SCTP_SOCKET_UNLOCK(so, 1);
 1066 #endif
 1067 }
 1068 
 1069 /*
 1070  * Skip past the param header and then we will find the chunk that caused the
 1071  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
 1072  * our peer must be broken.
 1073  */
 1074 static void
 1075 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
 1076     struct sctp_nets *net)
 1077 {
 1078         struct sctp_chunkhdr *chk;
 1079 
 1080         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
 1081         switch (chk->chunk_type) {
 1082         case SCTP_ASCONF_ACK:
 1083         case SCTP_ASCONF:
 1084                 sctp_asconf_cleanup(stcb, net);
 1085                 break;
 1086         case SCTP_FORWARD_CUM_TSN:
 1087                 stcb->asoc.prsctp_supported = 0;
 1088                 break;
 1089         default:
 1090                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1091                     "Peer does not support chunk type %d(%x)??\n",
 1092                     chk->chunk_type, (uint32_t) chk->chunk_type);
 1093                 break;
 1094         }
 1095 }
 1096 
 1097 /*
 1098  * Skip past the param header and then we will find the param that caused the
 1099  * problem.  There are a number of param's in a ASCONF OR the prsctp param
 1100  * these will turn of specific features.
 1101  * XXX: Is this the right thing to do?
 1102  */
 1103 static void
 1104 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
 1105 {
 1106         struct sctp_paramhdr *pbad;
 1107 
 1108         pbad = phdr + 1;
 1109         switch (ntohs(pbad->param_type)) {
 1110                 /* pr-sctp draft */
 1111         case SCTP_PRSCTP_SUPPORTED:
 1112                 stcb->asoc.prsctp_supported = 0;
 1113                 break;
 1114         case SCTP_SUPPORTED_CHUNK_EXT:
 1115                 break;
 1116                 /* draft-ietf-tsvwg-addip-sctp */
 1117         case SCTP_HAS_NAT_SUPPORT:
 1118                 stcb->asoc.peer_supports_nat = 0;
 1119                 break;
 1120         case SCTP_ADD_IP_ADDRESS:
 1121         case SCTP_DEL_IP_ADDRESS:
 1122         case SCTP_SET_PRIM_ADDR:
 1123                 stcb->asoc.asconf_supported = 0;
 1124                 break;
 1125         case SCTP_SUCCESS_REPORT:
 1126         case SCTP_ERROR_CAUSE_IND:
 1127                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
 1128                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1129                     "Turning off ASCONF to this strange peer\n");
 1130                 stcb->asoc.asconf_supported = 0;
 1131                 break;
 1132         default:
 1133                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1134                     "Peer does not support param type %d(%x)??\n",
 1135                     pbad->param_type, (uint32_t) pbad->param_type);
 1136                 break;
 1137         }
 1138 }
 1139 
 1140 static int
 1141 sctp_handle_error(struct sctp_chunkhdr *ch,
 1142     struct sctp_tcb *stcb, struct sctp_nets *net)
 1143 {
 1144         int chklen;
 1145         struct sctp_paramhdr *phdr;
 1146         uint16_t error, error_type;
 1147         uint16_t error_len;
 1148         struct sctp_association *asoc;
 1149         int adjust;
 1150 
 1151 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1152         struct socket *so;
 1153 
 1154 #endif
 1155 
 1156         /* parse through all of the errors and process */
 1157         asoc = &stcb->asoc;
 1158         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
 1159             sizeof(struct sctp_chunkhdr));
 1160         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
 1161         error = 0;
 1162         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
 1163                 /* Process an Error Cause */
 1164                 error_type = ntohs(phdr->param_type);
 1165                 error_len = ntohs(phdr->param_length);
 1166                 if ((error_len > chklen) || (error_len == 0)) {
 1167                         /* invalid param length for this param */
 1168                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
 1169                             chklen, error_len);
 1170                         return (0);
 1171                 }
 1172                 if (error == 0) {
 1173                         /* report the first error cause */
 1174                         error = error_type;
 1175                 }
 1176                 switch (error_type) {
 1177                 case SCTP_CAUSE_INVALID_STREAM:
 1178                 case SCTP_CAUSE_MISSING_PARAM:
 1179                 case SCTP_CAUSE_INVALID_PARAM:
 1180                 case SCTP_CAUSE_NO_USER_DATA:
 1181                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
 1182                             error_type);
 1183                         break;
 1184                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
 1185                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 1186                             ch->chunk_flags);
 1187                         if (sctp_handle_nat_colliding_state(stcb)) {
 1188                                 return (0);
 1189                         }
 1190                         break;
 1191                 case SCTP_CAUSE_NAT_MISSING_STATE:
 1192                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 1193                             ch->chunk_flags);
 1194                         if (sctp_handle_nat_missing_state(stcb, net)) {
 1195                                 return (0);
 1196                         }
 1197                         break;
 1198                 case SCTP_CAUSE_STALE_COOKIE:
 1199                         /*
 1200                          * We only act if we have echoed a cookie and are
 1201                          * waiting.
 1202                          */
 1203                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
 1204                                 int *p;
 1205 
 1206                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
 1207                                 /* Save the time doubled */
 1208                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
 1209                                 asoc->stale_cookie_count++;
 1210                                 if (asoc->stale_cookie_count >
 1211                                     asoc->max_init_times) {
 1212                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
 1213                                         /* now free the asoc */
 1214 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1215                                         so = SCTP_INP_SO(stcb->sctp_ep);
 1216                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 1217                                         SCTP_TCB_UNLOCK(stcb);
 1218                                         SCTP_SOCKET_LOCK(so, 1);
 1219                                         SCTP_TCB_LOCK(stcb);
 1220                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1221 #endif
 1222                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 1223                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
 1224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1225                                         SCTP_SOCKET_UNLOCK(so, 1);
 1226 #endif
 1227                                         return (-1);
 1228                                 }
 1229                                 /* blast back to INIT state */
 1230                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 1231                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
 1232                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
 1233                                 sctp_stop_all_cookie_timers(stcb);
 1234                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 1235                         }
 1236                         break;
 1237                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
 1238                         /*
 1239                          * Nothing we can do here, we don't do hostname
 1240                          * addresses so if the peer does not like my IPv6
 1241                          * (or IPv4 for that matter) it does not matter. If
 1242                          * they don't support that type of address, they can
 1243                          * NOT possibly get that packet type... i.e. with no
 1244                          * IPv6 you can't recieve a IPv6 packet. so we can
 1245                          * safely ignore this one. If we ever added support
 1246                          * for HOSTNAME Addresses, then we would need to do
 1247                          * something here.
 1248                          */
 1249                         break;
 1250                 case SCTP_CAUSE_UNRECOG_CHUNK:
 1251                         sctp_process_unrecog_chunk(stcb, phdr, net);
 1252                         break;
 1253                 case SCTP_CAUSE_UNRECOG_PARAM:
 1254                         sctp_process_unrecog_param(stcb, phdr);
 1255                         break;
 1256                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
 1257                         /*
 1258                          * We ignore this since the timer will drive out a
 1259                          * new cookie anyway and there timer will drive us
 1260                          * to send a SHUTDOWN_COMPLETE. We can't send one
 1261                          * here since we don't have their tag.
 1262                          */
 1263                         break;
 1264                 case SCTP_CAUSE_DELETING_LAST_ADDR:
 1265                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
 1266                 case SCTP_CAUSE_DELETING_SRC_ADDR:
 1267                         /*
 1268                          * We should NOT get these here, but in a
 1269                          * ASCONF-ACK.
 1270                          */
 1271                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
 1272                             error_type);
 1273                         break;
 1274                 case SCTP_CAUSE_OUT_OF_RESC:
 1275                         /*
 1276                          * And what, pray tell do we do with the fact that
 1277                          * the peer is out of resources? Not really sure we
 1278                          * could do anything but abort. I suspect this
 1279                          * should have came WITH an abort instead of in a
 1280                          * OP-ERROR.
 1281                          */
 1282                         break;
 1283                 default:
 1284                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
 1285                             error_type);
 1286                         break;
 1287                 }
 1288                 adjust = SCTP_SIZE32(error_len);
 1289                 chklen -= adjust;
 1290                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
 1291         }
 1292         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
 1293         return (0);
 1294 }
 1295 
 1296 static int
 1297 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
 1298     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 1299     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 1300     struct sctp_nets *net, int *abort_no_unlock,
 1301     uint8_t mflowtype, uint32_t mflowid,
 1302     uint32_t vrf_id)
 1303 {
 1304         struct sctp_init_ack *init_ack;
 1305         struct mbuf *op_err;
 1306 
 1307         SCTPDBG(SCTP_DEBUG_INPUT2,
 1308             "sctp_handle_init_ack: handling INIT-ACK\n");
 1309 
 1310         if (stcb == NULL) {
 1311                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1312                     "sctp_handle_init_ack: TCB is null\n");
 1313                 return (-1);
 1314         }
 1315         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
 1316                 /* Invalid length */
 1317                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1318                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1319                     src, dst, sh, op_err,
 1320                     mflowtype, mflowid,
 1321                     vrf_id, net->port);
 1322                 *abort_no_unlock = 1;
 1323                 return (-1);
 1324         }
 1325         init_ack = &cp->init;
 1326         /* validate parameters */
 1327         if (init_ack->initiate_tag == 0) {
 1328                 /* protocol error... send an abort */
 1329                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1330                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1331                     src, dst, sh, op_err,
 1332                     mflowtype, mflowid,
 1333                     vrf_id, net->port);
 1334                 *abort_no_unlock = 1;
 1335                 return (-1);
 1336         }
 1337         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
 1338                 /* protocol error... send an abort */
 1339                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1340                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1341                     src, dst, sh, op_err,
 1342                     mflowtype, mflowid,
 1343                     vrf_id, net->port);
 1344                 *abort_no_unlock = 1;
 1345                 return (-1);
 1346         }
 1347         if (init_ack->num_inbound_streams == 0) {
 1348                 /* protocol error... send an abort */
 1349                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1350                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1351                     src, dst, sh, op_err,
 1352                     mflowtype, mflowid,
 1353                     vrf_id, net->port);
 1354                 *abort_no_unlock = 1;
 1355                 return (-1);
 1356         }
 1357         if (init_ack->num_outbound_streams == 0) {
 1358                 /* protocol error... send an abort */
 1359                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1360                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1361                     src, dst, sh, op_err,
 1362                     mflowtype, mflowid,
 1363                     vrf_id, net->port);
 1364                 *abort_no_unlock = 1;
 1365                 return (-1);
 1366         }
 1367         /* process according to association state... */
 1368         switch (stcb->asoc.state & SCTP_STATE_MASK) {
 1369         case SCTP_STATE_COOKIE_WAIT:
 1370                 /* this is the expected state for this chunk */
 1371                 /* process the INIT-ACK parameters */
 1372                 if (stcb->asoc.primary_destination->dest_state &
 1373                     SCTP_ADDR_UNCONFIRMED) {
 1374                         /*
 1375                          * The primary is where we sent the INIT, we can
 1376                          * always consider it confirmed when the INIT-ACK is
 1377                          * returned. Do this before we load addresses
 1378                          * though.
 1379                          */
 1380                         stcb->asoc.primary_destination->dest_state &=
 1381                             ~SCTP_ADDR_UNCONFIRMED;
 1382                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 1383                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
 1384                 }
 1385                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
 1386                     net, abort_no_unlock,
 1387                     mflowtype, mflowid,
 1388                     vrf_id) < 0) {
 1389                         /* error in parsing parameters */
 1390                         return (-1);
 1391                 }
 1392                 /* update our state */
 1393                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
 1394                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
 1395 
 1396                 /* reset the RTO calc */
 1397                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 1398                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 1399                             stcb->asoc.overall_error_count,
 1400                             0,
 1401                             SCTP_FROM_SCTP_INPUT,
 1402                             __LINE__);
 1403                 }
 1404                 stcb->asoc.overall_error_count = 0;
 1405                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 1406                 /*
 1407                  * collapse the init timer back in case of a exponential
 1408                  * backoff
 1409                  */
 1410                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
 1411                     stcb, net);
 1412                 /*
 1413                  * the send at the end of the inbound data processing will
 1414                  * cause the cookie to be sent
 1415                  */
 1416                 break;
 1417         case SCTP_STATE_SHUTDOWN_SENT:
 1418                 /* incorrect state... discard */
 1419                 break;
 1420         case SCTP_STATE_COOKIE_ECHOED:
 1421                 /* incorrect state... discard */
 1422                 break;
 1423         case SCTP_STATE_OPEN:
 1424                 /* incorrect state... discard */
 1425                 break;
 1426         case SCTP_STATE_EMPTY:
 1427         case SCTP_STATE_INUSE:
 1428         default:
 1429                 /* incorrect state... discard */
 1430                 return (-1);
 1431                 break;
 1432         }
 1433         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
 1434         return (0);
 1435 }
 1436 
 1437 static struct sctp_tcb *
 1438 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 1439     struct sockaddr *src, struct sockaddr *dst,
 1440     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 1441     struct sctp_inpcb *inp, struct sctp_nets **netp,
 1442     struct sockaddr *init_src, int *notification,
 1443     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 1444     uint8_t mflowtype, uint32_t mflowid,
 1445     uint32_t vrf_id, uint16_t port);
 1446 
 1447 
 1448 /*
 1449  * handle a state cookie for an existing association m: input packet mbuf
 1450  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
 1451  * "split" mbuf and the cookie signature does not exist offset: offset into
 1452  * mbuf to the cookie-echo chunk
 1453  */
 1454 static struct sctp_tcb *
 1455 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
 1456     struct sockaddr *src, struct sockaddr *dst,
 1457     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 1458     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
 1459     struct sockaddr *init_src, int *notification,
 1460     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 1461     uint8_t mflowtype, uint32_t mflowid,
 1462     uint32_t vrf_id, uint16_t port)
 1463 {
 1464         struct sctp_association *asoc;
 1465         struct sctp_init_chunk *init_cp, init_buf;
 1466         struct sctp_init_ack_chunk *initack_cp, initack_buf;
 1467         struct sctp_nets *net;
 1468         struct mbuf *op_err;
 1469         int init_offset, initack_offset, i;
 1470         int retval;
 1471         int spec_flag = 0;
 1472         uint32_t how_indx;
 1473 
 1474 #if defined(SCTP_DETAILED_STR_STATS)
 1475         int j;
 1476 
 1477 #endif
 1478 
 1479         net = *netp;
 1480         /* I know that the TCB is non-NULL from the caller */
 1481         asoc = &stcb->asoc;
 1482         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
 1483                 if (asoc->cookie_how[how_indx] == 0)
 1484                         break;
 1485         }
 1486         if (how_indx < sizeof(asoc->cookie_how)) {
 1487                 asoc->cookie_how[how_indx] = 1;
 1488         }
 1489         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 1490                 /* SHUTDOWN came in after sending INIT-ACK */
 1491                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 1492                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
 1493                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
 1494                     mflowtype, mflowid, inp->fibnum,
 1495                     vrf_id, net->port);
 1496                 if (how_indx < sizeof(asoc->cookie_how))
 1497                         asoc->cookie_how[how_indx] = 2;
 1498                 return (NULL);
 1499         }
 1500         /*
 1501          * find and validate the INIT chunk in the cookie (peer's info) the
 1502          * INIT should start after the cookie-echo header struct (chunk
 1503          * header, state cookie header struct)
 1504          */
 1505         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
 1506 
 1507         init_cp = (struct sctp_init_chunk *)
 1508             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
 1509             (uint8_t *) & init_buf);
 1510         if (init_cp == NULL) {
 1511                 /* could not pull a INIT chunk in cookie */
 1512                 return (NULL);
 1513         }
 1514         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
 1515                 return (NULL);
 1516         }
 1517         /*
 1518          * find and validate the INIT-ACK chunk in the cookie (my info) the
 1519          * INIT-ACK follows the INIT chunk
 1520          */
 1521         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
 1522         initack_cp = (struct sctp_init_ack_chunk *)
 1523             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
 1524             (uint8_t *) & initack_buf);
 1525         if (initack_cp == NULL) {
 1526                 /* could not pull INIT-ACK chunk in cookie */
 1527                 return (NULL);
 1528         }
 1529         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
 1530                 return (NULL);
 1531         }
 1532         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1533             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
 1534                 /*
 1535                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
 1536                  * to get into the OPEN state
 1537                  */
 1538                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
 1539                         /*-
 1540                          * Opps, this means that we somehow generated two vtag's
 1541                          * the same. I.e. we did:
 1542                          *  Us               Peer
 1543                          *   <---INIT(tag=a)------
 1544                          *   ----INIT-ACK(tag=t)-->
 1545                          *   ----INIT(tag=t)------> *1
 1546                          *   <---INIT-ACK(tag=a)---
 1547                          *   <----CE(tag=t)------------- *2
 1548                          *
 1549                          * At point *1 we should be generating a different
 1550                          * tag t'. Which means we would throw away the CE and send
 1551                          * ours instead. Basically this is case C (throw away side).
 1552                          */
 1553                         if (how_indx < sizeof(asoc->cookie_how))
 1554                                 asoc->cookie_how[how_indx] = 17;
 1555                         return (NULL);
 1556 
 1557                 }
 1558                 switch (SCTP_GET_STATE(asoc)) {
 1559                 case SCTP_STATE_COOKIE_WAIT:
 1560                 case SCTP_STATE_COOKIE_ECHOED:
 1561                         /*
 1562                          * INIT was sent but got a COOKIE_ECHO with the
 1563                          * correct tags... just accept it...but we must
 1564                          * process the init so that we can make sure we have
 1565                          * the right seq no's.
 1566                          */
 1567                         /* First we must process the INIT !! */
 1568                         retval = sctp_process_init(init_cp, stcb);
 1569                         if (retval < 0) {
 1570                                 if (how_indx < sizeof(asoc->cookie_how))
 1571                                         asoc->cookie_how[how_indx] = 3;
 1572                                 return (NULL);
 1573                         }
 1574                         /* we have already processed the INIT so no problem */
 1575                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
 1576                             stcb, net,
 1577                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
 1578                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
 1579                             stcb, net,
 1580                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
 1581                         /* update current state */
 1582                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
 1583                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 1584                         else
 1585                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1586 
 1587                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1588                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1589                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1590                                     stcb->sctp_ep, stcb, asoc->primary_destination);
 1591                         }
 1592                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1593                         sctp_stop_all_cookie_timers(stcb);
 1594                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1595                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 1596                             (inp->sctp_socket->so_qlimit == 0)
 1597                             ) {
 1598 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1599                                 struct socket *so;
 1600 
 1601 #endif
 1602                                 /*
 1603                                  * Here is where collision would go if we
 1604                                  * did a connect() and instead got a
 1605                                  * init/init-ack/cookie done before the
 1606                                  * init-ack came back..
 1607                                  */
 1608                                 stcb->sctp_ep->sctp_flags |=
 1609                                     SCTP_PCB_FLAGS_CONNECTED;
 1610 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1611                                 so = SCTP_INP_SO(stcb->sctp_ep);
 1612                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1613                                 SCTP_TCB_UNLOCK(stcb);
 1614                                 SCTP_SOCKET_LOCK(so, 1);
 1615                                 SCTP_TCB_LOCK(stcb);
 1616                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1617                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1618                                         SCTP_SOCKET_UNLOCK(so, 1);
 1619                                         return (NULL);
 1620                                 }
 1621 #endif
 1622                                 soisconnected(stcb->sctp_socket);
 1623 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1624                                 SCTP_SOCKET_UNLOCK(so, 1);
 1625 #endif
 1626                         }
 1627                         /* notify upper layer */
 1628                         *notification = SCTP_NOTIFY_ASSOC_UP;
 1629                         /*
 1630                          * since we did not send a HB make sure we don't
 1631                          * double things
 1632                          */
 1633                         net->hb_responded = 1;
 1634                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
 1635                             &cookie->time_entered,
 1636                             sctp_align_unsafe_makecopy,
 1637                             SCTP_RTT_FROM_NON_DATA);
 1638 
 1639                         if (stcb->asoc.sctp_autoclose_ticks &&
 1640                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
 1641                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
 1642                                     inp, stcb, NULL);
 1643                         }
 1644                         break;
 1645                 default:
 1646                         /*
 1647                          * we're in the OPEN state (or beyond), so peer must
 1648                          * have simply lost the COOKIE-ACK
 1649                          */
 1650                         break;
 1651                 }               /* end switch */
 1652                 sctp_stop_all_cookie_timers(stcb);
 1653                 /*
 1654                  * We ignore the return code here.. not sure if we should
 1655                  * somehow abort.. but we do have an existing asoc. This
 1656                  * really should not fail.
 1657                  */
 1658                 if (sctp_load_addresses_from_init(stcb, m,
 1659                     init_offset + sizeof(struct sctp_init_chunk),
 1660                     initack_offset, src, dst, init_src)) {
 1661                         if (how_indx < sizeof(asoc->cookie_how))
 1662                                 asoc->cookie_how[how_indx] = 4;
 1663                         return (NULL);
 1664                 }
 1665                 /* respond with a COOKIE-ACK */
 1666                 sctp_toss_old_cookies(stcb, asoc);
 1667                 sctp_send_cookie_ack(stcb);
 1668                 if (how_indx < sizeof(asoc->cookie_how))
 1669                         asoc->cookie_how[how_indx] = 5;
 1670                 return (stcb);
 1671         }
 1672         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
 1673             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
 1674             cookie->tie_tag_my_vtag == 0 &&
 1675             cookie->tie_tag_peer_vtag == 0) {
 1676                 /*
 1677                  * case C in Section 5.2.4 Table 2: XMOO silently discard
 1678                  */
 1679                 if (how_indx < sizeof(asoc->cookie_how))
 1680                         asoc->cookie_how[how_indx] = 6;
 1681                 return (NULL);
 1682         }
 1683         /*
 1684          * If nat support, and the below and stcb is established, send back
 1685          * a ABORT(colliding state) if we are established.
 1686          */
 1687         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
 1688             (asoc->peer_supports_nat) &&
 1689             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1690             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
 1691             (asoc->peer_vtag == 0)))) {
 1692                 /*
 1693                  * Special case - Peer's support nat. We may have two init's
 1694                  * that we gave out the same tag on since one was not
 1695                  * established.. i.e. we get INIT from host-1 behind the nat
 1696                  * and we respond tag-a, we get a INIT from host-2 behind
 1697                  * the nat and we get tag-a again. Then we bring up host-1
 1698                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
 1699                  * Now we have colliding state. We must send an abort here
 1700                  * with colliding state indication.
 1701                  */
 1702                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
 1703                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 1704                     mflowtype, mflowid, inp->fibnum,
 1705                     vrf_id, port);
 1706                 return (NULL);
 1707         }
 1708         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1709             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
 1710             (asoc->peer_vtag == 0))) {
 1711                 /*
 1712                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
 1713                  * should be ok, re-accept peer info
 1714                  */
 1715                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
 1716                         /*
 1717                          * Extension of case C. If we hit this, then the
 1718                          * random number generator returned the same vtag
 1719                          * when we first sent our INIT-ACK and when we later
 1720                          * sent our INIT. The side with the seq numbers that
 1721                          * are different will be the one that normnally
 1722                          * would have hit case C. This in effect "extends"
 1723                          * our vtags in this collision case to be 64 bits.
 1724                          * The same collision could occur aka you get both
 1725                          * vtag and seq number the same twice in a row.. but
 1726                          * is much less likely. If it did happen then we
 1727                          * would proceed through and bring up the assoc.. we
 1728                          * may end up with the wrong stream setup however..
 1729                          * which would be bad.. but there is no way to
 1730                          * tell.. until we send on a stream that does not
 1731                          * exist :-)
 1732                          */
 1733                         if (how_indx < sizeof(asoc->cookie_how))
 1734                                 asoc->cookie_how[how_indx] = 7;
 1735 
 1736                         return (NULL);
 1737                 }
 1738                 if (how_indx < sizeof(asoc->cookie_how))
 1739                         asoc->cookie_how[how_indx] = 8;
 1740                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
 1741                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
 1742                 sctp_stop_all_cookie_timers(stcb);
 1743                 /*
 1744                  * since we did not send a HB make sure we don't double
 1745                  * things
 1746                  */
 1747                 net->hb_responded = 1;
 1748                 if (stcb->asoc.sctp_autoclose_ticks &&
 1749                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1750                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1751                             NULL);
 1752                 }
 1753                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 1754                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
 1755 
 1756                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
 1757                         /*
 1758                          * Ok the peer probably discarded our data (if we
 1759                          * echoed a cookie+data). So anything on the
 1760                          * sent_queue should be marked for retransmit, we
 1761                          * may not get something to kick us so it COULD
 1762                          * still take a timeout to move these.. but it can't
 1763                          * hurt to mark them.
 1764                          */
 1765                         struct sctp_tmit_chunk *chk;
 1766 
 1767                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 1768                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
 1769                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1770                                         sctp_flight_size_decrease(chk);
 1771                                         sctp_total_flight_decrease(stcb, chk);
 1772                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1773                                         spec_flag++;
 1774                                 }
 1775                         }
 1776 
 1777                 }
 1778                 /* process the INIT info (peer's info) */
 1779                 retval = sctp_process_init(init_cp, stcb);
 1780                 if (retval < 0) {
 1781                         if (how_indx < sizeof(asoc->cookie_how))
 1782                                 asoc->cookie_how[how_indx] = 9;
 1783                         return (NULL);
 1784                 }
 1785                 if (sctp_load_addresses_from_init(stcb, m,
 1786                     init_offset + sizeof(struct sctp_init_chunk),
 1787                     initack_offset, src, dst, init_src)) {
 1788                         if (how_indx < sizeof(asoc->cookie_how))
 1789                                 asoc->cookie_how[how_indx] = 10;
 1790                         return (NULL);
 1791                 }
 1792                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
 1793                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
 1794                         *notification = SCTP_NOTIFY_ASSOC_UP;
 1795 
 1796                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1797                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 1798                             (inp->sctp_socket->so_qlimit == 0)) {
 1799 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1800                                 struct socket *so;
 1801 
 1802 #endif
 1803                                 stcb->sctp_ep->sctp_flags |=
 1804                                     SCTP_PCB_FLAGS_CONNECTED;
 1805 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1806                                 so = SCTP_INP_SO(stcb->sctp_ep);
 1807                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1808                                 SCTP_TCB_UNLOCK(stcb);
 1809                                 SCTP_SOCKET_LOCK(so, 1);
 1810                                 SCTP_TCB_LOCK(stcb);
 1811                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1812                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1813                                         SCTP_SOCKET_UNLOCK(so, 1);
 1814                                         return (NULL);
 1815                                 }
 1816 #endif
 1817                                 soisconnected(stcb->sctp_socket);
 1818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1819                                 SCTP_SOCKET_UNLOCK(so, 1);
 1820 #endif
 1821                         }
 1822                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
 1823                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 1824                         else
 1825                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1826                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1827                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 1828                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
 1829                 } else {
 1830                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1831                 }
 1832                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1833                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1834                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1835                             stcb->sctp_ep, stcb, asoc->primary_destination);
 1836                 }
 1837                 sctp_stop_all_cookie_timers(stcb);
 1838                 sctp_toss_old_cookies(stcb, asoc);
 1839                 sctp_send_cookie_ack(stcb);
 1840                 if (spec_flag) {
 1841                         /*
 1842                          * only if we have retrans set do we do this. What
 1843                          * this call does is get only the COOKIE-ACK out and
 1844                          * then when we return the normal call to
 1845                          * sctp_chunk_output will get the retrans out behind
 1846                          * this.
 1847                          */
 1848                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
 1849                 }
 1850                 if (how_indx < sizeof(asoc->cookie_how))
 1851                         asoc->cookie_how[how_indx] = 11;
 1852 
 1853                 return (stcb);
 1854         }
 1855         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
 1856             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
 1857             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
 1858             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
 1859             cookie->tie_tag_peer_vtag != 0) {
 1860                 struct sctpasochead *head;
 1861 
 1862 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1863                 struct socket *so;
 1864 
 1865 #endif
 1866 
 1867                 if (asoc->peer_supports_nat) {
 1868                         /*
 1869                          * This is a gross gross hack. Just call the
 1870                          * cookie_new code since we are allowing a duplicate
 1871                          * association. I hope this works...
 1872                          */
 1873                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
 1874                             sh, cookie, cookie_len,
 1875                             inp, netp, init_src, notification,
 1876                             auth_skipped, auth_offset, auth_len,
 1877                             mflowtype, mflowid,
 1878                             vrf_id, port));
 1879                 }
 1880                 /*
 1881                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
 1882                  */
 1883                 /* temp code */
 1884                 if (how_indx < sizeof(asoc->cookie_how))
 1885                         asoc->cookie_how[how_indx] = 12;
 1886                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
 1887                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
 1888                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
 1889                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
 1890 
 1891                 /* notify upper layer */
 1892                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
 1893                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1894                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
 1895                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 1896                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 1897                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1898                 }
 1899                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 1900                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
 1901                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1902                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
 1903                 }
 1904                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1905                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1906                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1907                             stcb->sctp_ep, stcb, asoc->primary_destination);
 1908 
 1909                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
 1910                         /* move to OPEN state, if not in SHUTDOWN_SENT */
 1911                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1912                 }
 1913                 asoc->pre_open_streams =
 1914                     ntohs(initack_cp->init.num_outbound_streams);
 1915                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
 1916                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
 1917                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
 1918 
 1919                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
 1920 
 1921                 asoc->str_reset_seq_in = asoc->init_seq_number;
 1922 
 1923                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 1924                 if (asoc->mapping_array) {
 1925                         memset(asoc->mapping_array, 0,
 1926                             asoc->mapping_array_size);
 1927                 }
 1928                 if (asoc->nr_mapping_array) {
 1929                         memset(asoc->nr_mapping_array, 0,
 1930                             asoc->mapping_array_size);
 1931                 }
 1932                 SCTP_TCB_UNLOCK(stcb);
 1933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1934                 so = SCTP_INP_SO(stcb->sctp_ep);
 1935                 SCTP_SOCKET_LOCK(so, 1);
 1936 #endif
 1937                 SCTP_INP_INFO_WLOCK();
 1938                 SCTP_INP_WLOCK(stcb->sctp_ep);
 1939                 SCTP_TCB_LOCK(stcb);
 1940                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1941                 /* send up all the data */
 1942                 SCTP_TCB_SEND_LOCK(stcb);
 1943 
 1944                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
 1945                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1946                         stcb->asoc.strmout[i].chunks_on_queues = 0;
 1947 #if defined(SCTP_DETAILED_STR_STATS)
 1948                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
 1949                                 asoc->strmout[i].abandoned_sent[j] = 0;
 1950                                 asoc->strmout[i].abandoned_unsent[j] = 0;
 1951                         }
 1952 #else
 1953                         asoc->strmout[i].abandoned_sent[0] = 0;
 1954                         asoc->strmout[i].abandoned_unsent[0] = 0;
 1955 #endif
 1956                         stcb->asoc.strmout[i].stream_no = i;
 1957                         stcb->asoc.strmout[i].next_sequence_send = 0;
 1958                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
 1959                 }
 1960                 /* process the INIT-ACK info (my info) */
 1961                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
 1962                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 1963 
 1964                 /* pull from vtag hash */
 1965                 LIST_REMOVE(stcb, sctp_asocs);
 1966                 /* re-insert to new vtag position */
 1967                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
 1968                     SCTP_BASE_INFO(hashasocmark))];
 1969                 /*
 1970                  * put it in the bucket in the vtag hash of assoc's for the
 1971                  * system
 1972                  */
 1973                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 1974 
 1975                 SCTP_TCB_SEND_UNLOCK(stcb);
 1976                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
 1977                 SCTP_INP_INFO_WUNLOCK();
 1978 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1979                 SCTP_SOCKET_UNLOCK(so, 1);
 1980 #endif
 1981                 asoc->total_flight = 0;
 1982                 asoc->total_flight_count = 0;
 1983                 /* process the INIT info (peer's info) */
 1984                 retval = sctp_process_init(init_cp, stcb);
 1985                 if (retval < 0) {
 1986                         if (how_indx < sizeof(asoc->cookie_how))
 1987                                 asoc->cookie_how[how_indx] = 13;
 1988 
 1989                         return (NULL);
 1990                 }
 1991                 /*
 1992                  * since we did not send a HB make sure we don't double
 1993                  * things
 1994                  */
 1995                 net->hb_responded = 1;
 1996 
 1997                 if (sctp_load_addresses_from_init(stcb, m,
 1998                     init_offset + sizeof(struct sctp_init_chunk),
 1999                     initack_offset, src, dst, init_src)) {
 2000                         if (how_indx < sizeof(asoc->cookie_how))
 2001                                 asoc->cookie_how[how_indx] = 14;
 2002 
 2003                         return (NULL);
 2004                 }
 2005                 /* respond with a COOKIE-ACK */
 2006                 sctp_stop_all_cookie_timers(stcb);
 2007                 sctp_toss_old_cookies(stcb, asoc);
 2008                 sctp_send_cookie_ack(stcb);
 2009                 if (how_indx < sizeof(asoc->cookie_how))
 2010                         asoc->cookie_how[how_indx] = 15;
 2011 
 2012                 return (stcb);
 2013         }
 2014         if (how_indx < sizeof(asoc->cookie_how))
 2015                 asoc->cookie_how[how_indx] = 16;
 2016         /* all other cases... */
 2017         return (NULL);
 2018 }
 2019 
 2020 
 2021 /*
 2022  * handle a state cookie for a new association m: input packet mbuf chain--
 2023  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
 2024  * and the cookie signature does not exist offset: offset into mbuf to the
 2025  * cookie-echo chunk length: length of the cookie chunk to: where the init
 2026  * was from returns a new TCB
 2027  */
 2028 static struct sctp_tcb *
 2029 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 2030     struct sockaddr *src, struct sockaddr *dst,
 2031     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 2032     struct sctp_inpcb *inp, struct sctp_nets **netp,
 2033     struct sockaddr *init_src, int *notification,
 2034     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 2035     uint8_t mflowtype, uint32_t mflowid,
 2036     uint32_t vrf_id, uint16_t port)
 2037 {
 2038         struct sctp_tcb *stcb;
 2039         struct sctp_init_chunk *init_cp, init_buf;
 2040         struct sctp_init_ack_chunk *initack_cp, initack_buf;
 2041         union sctp_sockstore store;
 2042         struct sctp_association *asoc;
 2043         int init_offset, initack_offset, initack_limit;
 2044         int retval;
 2045         int error = 0;
 2046         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
 2047 
 2048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2049         struct socket *so;
 2050 
 2051         so = SCTP_INP_SO(inp);
 2052 #endif
 2053 
 2054         /*
 2055          * find and validate the INIT chunk in the cookie (peer's info) the
 2056          * INIT should start after the cookie-echo header struct (chunk
 2057          * header, state cookie header struct)
 2058          */
 2059         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
 2060         init_cp = (struct sctp_init_chunk *)
 2061             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
 2062             (uint8_t *) & init_buf);
 2063         if (init_cp == NULL) {
 2064                 /* could not pull a INIT chunk in cookie */
 2065                 SCTPDBG(SCTP_DEBUG_INPUT1,
 2066                     "process_cookie_new: could not pull INIT chunk hdr\n");
 2067                 return (NULL);
 2068         }
 2069         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
 2070                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
 2071                 return (NULL);
 2072         }
 2073         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
 2074         /*
 2075          * find and validate the INIT-ACK chunk in the cookie (my info) the
 2076          * INIT-ACK follows the INIT chunk
 2077          */
 2078         initack_cp = (struct sctp_init_ack_chunk *)
 2079             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
 2080             (uint8_t *) & initack_buf);
 2081         if (initack_cp == NULL) {
 2082                 /* could not pull INIT-ACK chunk in cookie */
 2083                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
 2084                 return (NULL);
 2085         }
 2086         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
 2087                 return (NULL);
 2088         }
 2089         /*
 2090          * NOTE: We can't use the INIT_ACK's chk_length to determine the
 2091          * "initack_limit" value.  This is because the chk_length field
 2092          * includes the length of the cookie, but the cookie is omitted when
 2093          * the INIT and INIT_ACK are tacked onto the cookie...
 2094          */
 2095         initack_limit = offset + cookie_len;
 2096 
 2097         /*
 2098          * now that we know the INIT/INIT-ACK are in place, create a new TCB
 2099          * and popluate
 2100          */
 2101 
 2102         /*
 2103          * Here we do a trick, we set in NULL for the proc/thread argument.
 2104          * We do this since in effect we only use the p argument when the
 2105          * socket is unbound and we must do an implicit bind. Since we are
 2106          * getting a cookie, we cannot be unbound.
 2107          */
 2108         stcb = sctp_aloc_assoc(inp, init_src, &error,
 2109             ntohl(initack_cp->init.initiate_tag), vrf_id,
 2110             ntohs(initack_cp->init.num_outbound_streams),
 2111             (struct thread *)NULL
 2112             );
 2113         if (stcb == NULL) {
 2114                 struct mbuf *op_err;
 2115 
 2116                 /* memory problem? */
 2117                 SCTPDBG(SCTP_DEBUG_INPUT1,
 2118                     "process_cookie_new: no room for another TCB!\n");
 2119                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 2120                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
 2121                     src, dst, sh, op_err,
 2122                     mflowtype, mflowid,
 2123                     vrf_id, port);
 2124                 return (NULL);
 2125         }
 2126         /* get the correct sctp_nets */
 2127         if (netp)
 2128                 *netp = sctp_findnet(stcb, init_src);
 2129 
 2130         asoc = &stcb->asoc;
 2131         /* get scope variables out of cookie */
 2132         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
 2133         asoc->scope.site_scope = cookie->site_scope;
 2134         asoc->scope.local_scope = cookie->local_scope;
 2135         asoc->scope.loopback_scope = cookie->loopback_scope;
 2136 
 2137         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
 2138             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
 2139                 struct mbuf *op_err;
 2140 
 2141                 /*
 2142                  * Houston we have a problem. The EP changed while the
 2143                  * cookie was in flight. Only recourse is to abort the
 2144                  * association.
 2145                  */
 2146                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2147                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 2148                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
 2149                     src, dst, sh, op_err,
 2150                     mflowtype, mflowid,
 2151                     vrf_id, port);
 2152 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2153                 SCTP_TCB_UNLOCK(stcb);
 2154                 SCTP_SOCKET_LOCK(so, 1);
 2155                 SCTP_TCB_LOCK(stcb);
 2156 #endif
 2157                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2158                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
 2159 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2160                 SCTP_SOCKET_UNLOCK(so, 1);
 2161 #endif
 2162                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2163                 return (NULL);
 2164         }
 2165         /* process the INIT-ACK info (my info) */
 2166         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
 2167         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 2168         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
 2169         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
 2170         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
 2171         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
 2172         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
 2173         asoc->str_reset_seq_in = asoc->init_seq_number;
 2174 
 2175         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 2176 
 2177         /* process the INIT info (peer's info) */
 2178         if (netp)
 2179                 retval = sctp_process_init(init_cp, stcb);
 2180         else
 2181                 retval = 0;
 2182         if (retval < 0) {
 2183                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2184 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2185                 SCTP_TCB_UNLOCK(stcb);
 2186                 SCTP_SOCKET_LOCK(so, 1);
 2187                 SCTP_TCB_LOCK(stcb);
 2188 #endif
 2189                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2190                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
 2191 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2192                 SCTP_SOCKET_UNLOCK(so, 1);
 2193 #endif
 2194                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2195                 return (NULL);
 2196         }
 2197         /* load all addresses */
 2198         if (sctp_load_addresses_from_init(stcb, m,
 2199             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
 2200             src, dst, init_src)) {
 2201                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2203                 SCTP_TCB_UNLOCK(stcb);
 2204                 SCTP_SOCKET_LOCK(so, 1);
 2205                 SCTP_TCB_LOCK(stcb);
 2206 #endif
 2207                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2208                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
 2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2210                 SCTP_SOCKET_UNLOCK(so, 1);
 2211 #endif
 2212                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2213                 return (NULL);
 2214         }
 2215         /*
 2216          * verify any preceding AUTH chunk that was skipped
 2217          */
 2218         /* pull the local authentication parameters from the cookie/init-ack */
 2219         sctp_auth_get_cookie_params(stcb, m,
 2220             initack_offset + sizeof(struct sctp_init_ack_chunk),
 2221             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
 2222         if (auth_skipped) {
 2223                 struct sctp_auth_chunk *auth;
 2224 
 2225                 auth = (struct sctp_auth_chunk *)
 2226                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
 2227                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
 2228                         /* auth HMAC failed, dump the assoc and packet */
 2229                         SCTPDBG(SCTP_DEBUG_AUTH1,
 2230                             "COOKIE-ECHO: AUTH failed\n");
 2231                         atomic_add_int(&stcb->asoc.refcnt, 1);
 2232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2233                         SCTP_TCB_UNLOCK(stcb);
 2234                         SCTP_SOCKET_LOCK(so, 1);
 2235                         SCTP_TCB_LOCK(stcb);
 2236 #endif
 2237                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2238                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
 2239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2240                         SCTP_SOCKET_UNLOCK(so, 1);
 2241 #endif
 2242                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2243                         return (NULL);
 2244                 } else {
 2245                         /* remaining chunks checked... good to go */
 2246                         stcb->asoc.authenticated = 1;
 2247                 }
 2248         }
 2249         /* update current state */
 2250         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
 2251         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 2252         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 2253                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 2254                     stcb->sctp_ep, stcb, asoc->primary_destination);
 2255         }
 2256         sctp_stop_all_cookie_timers(stcb);
 2257         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
 2258         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 2259 
 2260         /*
 2261          * if we're doing ASCONFs, check to see if we have any new local
 2262          * addresses that need to get added to the peer (eg. addresses
 2263          * changed while cookie echo in flight).  This needs to be done
 2264          * after we go to the OPEN state to do the correct asconf
 2265          * processing. else, make sure we have the correct addresses in our
 2266          * lists
 2267          */
 2268 
 2269         /* warning, we re-use sin, sin6, sa_store here! */
 2270         /* pull in local_address (our "from" address) */
 2271         switch (cookie->laddr_type) {
 2272 #ifdef INET
 2273         case SCTP_IPV4_ADDRESS:
 2274                 /* source addr is IPv4 */
 2275                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
 2276                 store.sin.sin_family = AF_INET;
 2277                 store.sin.sin_len = sizeof(struct sockaddr_in);
 2278                 store.sin.sin_addr.s_addr = cookie->laddress[0];
 2279                 break;
 2280 #endif
 2281 #ifdef INET6
 2282         case SCTP_IPV6_ADDRESS:
 2283                 /* source addr is IPv6 */
 2284                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
 2285                 store.sin6.sin6_family = AF_INET6;
 2286                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
 2287                 store.sin6.sin6_scope_id = cookie->scope_id;
 2288                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
 2289                 break;
 2290 #endif
 2291         default:
 2292                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2293 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2294                 SCTP_TCB_UNLOCK(stcb);
 2295                 SCTP_SOCKET_LOCK(so, 1);
 2296                 SCTP_TCB_LOCK(stcb);
 2297 #endif
 2298                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2299                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
 2300 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2301                 SCTP_SOCKET_UNLOCK(so, 1);
 2302 #endif
 2303                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2304                 return (NULL);
 2305         }
 2306 
 2307         /* set up to notify upper layer */
 2308         *notification = SCTP_NOTIFY_ASSOC_UP;
 2309         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 2310             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 2311             (inp->sctp_socket->so_qlimit == 0)) {
 2312                 /*
 2313                  * This is an endpoint that called connect() how it got a
 2314                  * cookie that is NEW is a bit of a mystery. It must be that
 2315                  * the INIT was sent, but before it got there.. a complete
 2316                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
 2317                  * should have went to the other code.. not here.. oh well..
 2318                  * a bit of protection is worth having..
 2319                  */
 2320                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 2321 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2322                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2323                 SCTP_TCB_UNLOCK(stcb);
 2324                 SCTP_SOCKET_LOCK(so, 1);
 2325                 SCTP_TCB_LOCK(stcb);
 2326                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2327                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 2328                         SCTP_SOCKET_UNLOCK(so, 1);
 2329                         return (NULL);
 2330                 }
 2331 #endif
 2332                 soisconnected(stcb->sctp_socket);
 2333 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2334                 SCTP_SOCKET_UNLOCK(so, 1);
 2335 #endif
 2336         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 2337             (inp->sctp_socket->so_qlimit)) {
 2338                 /*
 2339                  * We don't want to do anything with this one. Since it is
 2340                  * the listening guy. The timer will get started for
 2341                  * accepted connections in the caller.
 2342                  */
 2343                 ;
 2344         }
 2345         /* since we did not send a HB make sure we don't double things */
 2346         if ((netp) && (*netp))
 2347                 (*netp)->hb_responded = 1;
 2348 
 2349         if (stcb->asoc.sctp_autoclose_ticks &&
 2350             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 2351                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
 2352         }
 2353         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 2354         if ((netp != NULL) && (*netp != NULL)) {
 2355                 /* calculate the RTT and set the encaps port */
 2356                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
 2357                     &cookie->time_entered, sctp_align_unsafe_makecopy,
 2358                     SCTP_RTT_FROM_NON_DATA);
 2359 #if defined(INET) || defined(INET6)
 2360                 if (((*netp)->port == 0) && (port != 0)) {
 2361                         sctp_pathmtu_adjustment(stcb, (*netp)->mtu - sizeof(struct udphdr));
 2362                 }
 2363                 (*netp)->port = port;
 2364 #endif
 2365         }
 2366         /* respond with a COOKIE-ACK */
 2367         sctp_send_cookie_ack(stcb);
 2368 
 2369         /*
 2370          * check the address lists for any ASCONFs that need to be sent
 2371          * AFTER the cookie-ack is sent
 2372          */
 2373         sctp_check_address_list(stcb, m,
 2374             initack_offset + sizeof(struct sctp_init_ack_chunk),
 2375             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
 2376             &store.sa, cookie->local_scope, cookie->site_scope,
 2377             cookie->ipv4_scope, cookie->loopback_scope);
 2378 
 2379 
 2380         return (stcb);
 2381 }
 2382 
 2383 /*
 2384  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
 2385  * we NEED to make sure we are not already using the vtag. If so we
 2386  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
 2387         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
 2388                                                             SCTP_BASE_INFO(hashasocmark))];
 2389         LIST_FOREACH(stcb, head, sctp_asocs) {
 2390                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
 2391                        -- SEND ABORT - TRY AGAIN --
 2392                 }
 2393         }
 2394 */
 2395 
 2396 /*
 2397  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
 2398  * existing (non-NULL) TCB
 2399  */
 2400 static struct mbuf *
 2401 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
 2402     struct sockaddr *src, struct sockaddr *dst,
 2403     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
 2404     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
 2405     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 2406     struct sctp_tcb **locked_tcb,
 2407     uint8_t mflowtype, uint32_t mflowid,
 2408     uint32_t vrf_id, uint16_t port)
 2409 {
 2410         struct sctp_state_cookie *cookie;
 2411         struct sctp_tcb *l_stcb = *stcb;
 2412         struct sctp_inpcb *l_inp;
 2413         struct sockaddr *to;
 2414         struct sctp_pcb *ep;
 2415         struct mbuf *m_sig;
 2416         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
 2417         uint8_t *sig;
 2418         uint8_t cookie_ok = 0;
 2419         unsigned int sig_offset, cookie_offset;
 2420         unsigned int cookie_len;
 2421         struct timeval now;
 2422         struct timeval time_expires;
 2423         int notification = 0;
 2424         struct sctp_nets *netl;
 2425         int had_a_existing_tcb = 0;
 2426         int send_int_conf = 0;
 2427 
 2428 #ifdef INET
 2429         struct sockaddr_in sin;
 2430 
 2431 #endif
 2432 #ifdef INET6
 2433         struct sockaddr_in6 sin6;
 2434 
 2435 #endif
 2436 
 2437         SCTPDBG(SCTP_DEBUG_INPUT2,
 2438             "sctp_handle_cookie: handling COOKIE-ECHO\n");
 2439 
 2440         if (inp_p == NULL) {
 2441                 return (NULL);
 2442         }
 2443         cookie = &cp->cookie;
 2444         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
 2445         cookie_len = ntohs(cp->ch.chunk_length);
 2446 
 2447         if ((cookie->peerport != sh->src_port) ||
 2448             (cookie->myport != sh->dest_port) ||
 2449             (cookie->my_vtag != sh->v_tag)) {
 2450                 /*
 2451                  * invalid ports or bad tag.  Note that we always leave the
 2452                  * v_tag in the header in network order and when we stored
 2453                  * it in the my_vtag slot we also left it in network order.
 2454                  * This maintains the match even though it may be in the
 2455                  * opposite byte order of the machine :->
 2456                  */
 2457                 return (NULL);
 2458         }
 2459         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
 2460             sizeof(struct sctp_init_chunk) +
 2461             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
 2462                 /* cookie too small */
 2463                 return (NULL);
 2464         }
 2465         /*
 2466          * split off the signature into its own mbuf (since it should not be
 2467          * calculated in the sctp_hmac_m() call).
 2468          */
 2469         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
 2470         m_sig = m_split(m, sig_offset, M_NOWAIT);
 2471         if (m_sig == NULL) {
 2472                 /* out of memory or ?? */
 2473                 return (NULL);
 2474         }
 2475 #ifdef SCTP_MBUF_LOGGING
 2476         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 2477                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
 2478         }
 2479 #endif
 2480 
 2481         /*
 2482          * compute the signature/digest for the cookie
 2483          */
 2484         ep = &(*inp_p)->sctp_ep;
 2485         l_inp = *inp_p;
 2486         if (l_stcb) {
 2487                 SCTP_TCB_UNLOCK(l_stcb);
 2488         }
 2489         SCTP_INP_RLOCK(l_inp);
 2490         if (l_stcb) {
 2491                 SCTP_TCB_LOCK(l_stcb);
 2492         }
 2493         /* which cookie is it? */
 2494         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
 2495             (ep->current_secret_number != ep->last_secret_number)) {
 2496                 /* it's the old cookie */
 2497                 (void)sctp_hmac_m(SCTP_HMAC,
 2498                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
 2499                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2500         } else {
 2501                 /* it's the current cookie */
 2502                 (void)sctp_hmac_m(SCTP_HMAC,
 2503                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
 2504                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2505         }
 2506         /* get the signature */
 2507         SCTP_INP_RUNLOCK(l_inp);
 2508         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
 2509         if (sig == NULL) {
 2510                 /* couldn't find signature */
 2511                 sctp_m_freem(m_sig);
 2512                 return (NULL);
 2513         }
 2514         /* compare the received digest with the computed digest */
 2515         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
 2516                 /* try the old cookie? */
 2517                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
 2518                     (ep->current_secret_number != ep->last_secret_number)) {
 2519                         /* compute digest with old */
 2520                         (void)sctp_hmac_m(SCTP_HMAC,
 2521                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
 2522                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2523                         /* compare */
 2524                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
 2525                                 cookie_ok = 1;
 2526                 }
 2527         } else {
 2528                 cookie_ok = 1;
 2529         }
 2530 
 2531         /*
 2532          * Now before we continue we must reconstruct our mbuf so that
 2533          * normal processing of any other chunks will work.
 2534          */
 2535         {
 2536                 struct mbuf *m_at;
 2537 
 2538                 m_at = m;
 2539                 while (SCTP_BUF_NEXT(m_at) != NULL) {
 2540                         m_at = SCTP_BUF_NEXT(m_at);
 2541                 }
 2542                 SCTP_BUF_NEXT(m_at) = m_sig;
 2543         }
 2544 
 2545         if (cookie_ok == 0) {
 2546                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
 2547                 SCTPDBG(SCTP_DEBUG_INPUT2,
 2548                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
 2549                     (uint32_t) offset, cookie_offset, sig_offset);
 2550                 return (NULL);
 2551         }
 2552         /*
 2553          * check the cookie timestamps to be sure it's not stale
 2554          */
 2555         (void)SCTP_GETTIME_TIMEVAL(&now);
 2556         /* Expire time is in Ticks, so we convert to seconds */
 2557         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
 2558         time_expires.tv_usec = cookie->time_entered.tv_usec;
 2559         /*
 2560          * TODO sctp_constants.h needs alternative time macros when _KERNEL
 2561          * is undefined.
 2562          */
 2563         if (timevalcmp(&now, &time_expires, >)) {
 2564                 /* cookie is stale! */
 2565                 struct mbuf *op_err;
 2566                 struct sctp_error_stale_cookie *cause;
 2567                 uint32_t tim;
 2568 
 2569                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
 2570                     0, M_NOWAIT, 1, MT_DATA);
 2571                 if (op_err == NULL) {
 2572                         /* FOOBAR */
 2573                         return (NULL);
 2574                 }
 2575                 /* Set the len */
 2576                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
 2577                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
 2578                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
 2579                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
 2580                     (sizeof(uint32_t))));
 2581                 /* seconds to usec */
 2582                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
 2583                 /* add in usec */
 2584                 if (tim == 0)
 2585                         tim = now.tv_usec - cookie->time_entered.tv_usec;
 2586                 cause->stale_time = htonl(tim);
 2587                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
 2588                     mflowtype, mflowid, l_inp->fibnum,
 2589                     vrf_id, port);
 2590                 return (NULL);
 2591         }
 2592         /*
 2593          * Now we must see with the lookup address if we have an existing
 2594          * asoc. This will only happen if we were in the COOKIE-WAIT state
 2595          * and a INIT collided with us and somewhere the peer sent the
 2596          * cookie on another address besides the single address our assoc
 2597          * had for him. In this case we will have one of the tie-tags set at
 2598          * least AND the address field in the cookie can be used to look it
 2599          * up.
 2600          */
 2601         to = NULL;
 2602         switch (cookie->addr_type) {
 2603 #ifdef INET6
 2604         case SCTP_IPV6_ADDRESS:
 2605                 memset(&sin6, 0, sizeof(sin6));
 2606                 sin6.sin6_family = AF_INET6;
 2607                 sin6.sin6_len = sizeof(sin6);
 2608                 sin6.sin6_port = sh->src_port;
 2609                 sin6.sin6_scope_id = cookie->scope_id;
 2610                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
 2611                     sizeof(sin6.sin6_addr.s6_addr));
 2612                 to = (struct sockaddr *)&sin6;
 2613                 break;
 2614 #endif
 2615 #ifdef INET
 2616         case SCTP_IPV4_ADDRESS:
 2617                 memset(&sin, 0, sizeof(sin));
 2618                 sin.sin_family = AF_INET;
 2619                 sin.sin_len = sizeof(sin);
 2620                 sin.sin_port = sh->src_port;
 2621                 sin.sin_addr.s_addr = cookie->address[0];
 2622                 to = (struct sockaddr *)&sin;
 2623                 break;
 2624 #endif
 2625         default:
 2626                 /* This should not happen */
 2627                 return (NULL);
 2628         }
 2629         if (*stcb == NULL) {
 2630                 /* Yep, lets check */
 2631                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
 2632                 if (*stcb == NULL) {
 2633                         /*
 2634                          * We should have only got back the same inp. If we
 2635                          * got back a different ep we have a problem. The
 2636                          * original findep got back l_inp and now
 2637                          */
 2638                         if (l_inp != *inp_p) {
 2639                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
 2640                         }
 2641                 } else {
 2642                         if (*locked_tcb == NULL) {
 2643                                 /*
 2644                                  * In this case we found the assoc only
 2645                                  * after we locked the create lock. This
 2646                                  * means we are in a colliding case and we
 2647                                  * must make sure that we unlock the tcb if
 2648                                  * its one of the cases where we throw away
 2649                                  * the incoming packets.
 2650                                  */
 2651                                 *locked_tcb = *stcb;
 2652 
 2653                                 /*
 2654                                  * We must also increment the inp ref count
 2655                                  * since the ref_count flags was set when we
 2656                                  * did not find the TCB, now we found it
 2657                                  * which reduces the refcount.. we must
 2658                                  * raise it back out to balance it all :-)
 2659                                  */
 2660                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
 2661                                 if ((*stcb)->sctp_ep != l_inp) {
 2662                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
 2663                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
 2664                                 }
 2665                         }
 2666                 }
 2667         }
 2668         cookie_len -= SCTP_SIGNATURE_SIZE;
 2669         if (*stcb == NULL) {
 2670                 /* this is the "normal" case... get a new TCB */
 2671                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
 2672                     cookie, cookie_len, *inp_p,
 2673                     netp, to, &notification,
 2674                     auth_skipped, auth_offset, auth_len,
 2675                     mflowtype, mflowid,
 2676                     vrf_id, port);
 2677         } else {
 2678                 /* this is abnormal... cookie-echo on existing TCB */
 2679                 had_a_existing_tcb = 1;
 2680                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
 2681                     src, dst, sh,
 2682                     cookie, cookie_len, *inp_p, *stcb, netp, to,
 2683                     &notification, auth_skipped, auth_offset, auth_len,
 2684                     mflowtype, mflowid,
 2685                     vrf_id, port);
 2686         }
 2687 
 2688         if (*stcb == NULL) {
 2689                 /* still no TCB... must be bad cookie-echo */
 2690                 return (NULL);
 2691         }
 2692         if (*netp != NULL) {
 2693                 (*netp)->flowtype = mflowtype;
 2694                 (*netp)->flowid = mflowid;
 2695         }
 2696         /*
 2697          * Ok, we built an association so confirm the address we sent the
 2698          * INIT-ACK to.
 2699          */
 2700         netl = sctp_findnet(*stcb, to);
 2701         /*
 2702          * This code should in theory NOT run but
 2703          */
 2704         if (netl == NULL) {
 2705                 /* TSNH! Huh, why do I need to add this address here? */
 2706                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
 2707                         return (NULL);
 2708                 }
 2709                 netl = sctp_findnet(*stcb, to);
 2710         }
 2711         if (netl) {
 2712                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
 2713                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 2714                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
 2715                             netl);
 2716                         send_int_conf = 1;
 2717                 }
 2718         }
 2719         sctp_start_net_timers(*stcb);
 2720         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 2721                 if (!had_a_existing_tcb ||
 2722                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 2723                         /*
 2724                          * If we have a NEW cookie or the connect never
 2725                          * reached the connected state during collision we
 2726                          * must do the TCP accept thing.
 2727                          */
 2728                         struct socket *so, *oso;
 2729                         struct sctp_inpcb *inp;
 2730 
 2731                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
 2732                                 /*
 2733                                  * For a restart we will keep the same
 2734                                  * socket, no need to do anything. I THINK!!
 2735                                  */
 2736                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2737                                 if (send_int_conf) {
 2738                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2739                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2740                                 }
 2741                                 return (m);
 2742                         }
 2743                         oso = (*inp_p)->sctp_socket;
 2744                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2745                         SCTP_TCB_UNLOCK((*stcb));
 2746                         CURVNET_SET(oso->so_vnet);
 2747                         so = sonewconn(oso, 0
 2748                             );
 2749                         CURVNET_RESTORE();
 2750                         SCTP_TCB_LOCK((*stcb));
 2751                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2752 
 2753                         if (so == NULL) {
 2754                                 struct mbuf *op_err;
 2755 
 2756 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2757                                 struct socket *pcb_so;
 2758 
 2759 #endif
 2760                                 /* Too many sockets */
 2761                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
 2762                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 2763                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
 2764                                     src, dst, sh, op_err,
 2765                                     mflowtype, mflowid,
 2766                                     vrf_id, port);
 2767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2768                                 pcb_so = SCTP_INP_SO(*inp_p);
 2769                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2770                                 SCTP_TCB_UNLOCK((*stcb));
 2771                                 SCTP_SOCKET_LOCK(pcb_so, 1);
 2772                                 SCTP_TCB_LOCK((*stcb));
 2773                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2774 #endif
 2775                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
 2776                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
 2777 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2778                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
 2779 #endif
 2780                                 return (NULL);
 2781                         }
 2782                         inp = (struct sctp_inpcb *)so->so_pcb;
 2783                         SCTP_INP_INCR_REF(inp);
 2784                         /*
 2785                          * We add the unbound flag here so that if we get an
 2786                          * soabort() before we get the move_pcb done, we
 2787                          * will properly cleanup.
 2788                          */
 2789                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
 2790                             SCTP_PCB_FLAGS_CONNECTED |
 2791                             SCTP_PCB_FLAGS_IN_TCPPOOL |
 2792                             SCTP_PCB_FLAGS_UNBOUND |
 2793                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
 2794                             SCTP_PCB_FLAGS_DONT_WAKE);
 2795                         inp->sctp_features = (*inp_p)->sctp_features;
 2796                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
 2797                         inp->sctp_socket = so;
 2798                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
 2799                         inp->max_cwnd = (*inp_p)->max_cwnd;
 2800                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
 2801                         inp->ecn_supported = (*inp_p)->ecn_supported;
 2802                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
 2803                         inp->auth_supported = (*inp_p)->auth_supported;
 2804                         inp->asconf_supported = (*inp_p)->asconf_supported;
 2805                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
 2806                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
 2807                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
 2808                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
 2809                         inp->sctp_context = (*inp_p)->sctp_context;
 2810                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
 2811                         inp->fibnum = (*inp_p)->fibnum;
 2812                         inp->inp_starting_point_for_iterator = NULL;
 2813                         /*
 2814                          * copy in the authentication parameters from the
 2815                          * original endpoint
 2816                          */
 2817                         if (inp->sctp_ep.local_hmacs)
 2818                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
 2819                         inp->sctp_ep.local_hmacs =
 2820                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
 2821                         if (inp->sctp_ep.local_auth_chunks)
 2822                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
 2823                         inp->sctp_ep.local_auth_chunks =
 2824                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
 2825 
 2826                         /*
 2827                          * Now we must move it from one hash table to
 2828                          * another and get the tcb in the right place.
 2829                          */
 2830 
 2831                         /*
 2832                          * This is where the one-2-one socket is put into
 2833                          * the accept state waiting for the accept!
 2834                          */
 2835                         if (*stcb) {
 2836                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
 2837                         }
 2838                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
 2839 
 2840                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2841                         SCTP_TCB_UNLOCK((*stcb));
 2842 
 2843                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
 2844                             0);
 2845                         SCTP_TCB_LOCK((*stcb));
 2846                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2847 
 2848 
 2849                         /*
 2850                          * now we must check to see if we were aborted while
 2851                          * the move was going on and the lock/unlock
 2852                          * happened.
 2853                          */
 2854                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 2855                                 /*
 2856                                  * yep it was, we leave the assoc attached
 2857                                  * to the socket since the sctp_inpcb_free()
 2858                                  * call will send an abort for us.
 2859                                  */
 2860                                 SCTP_INP_DECR_REF(inp);
 2861                                 return (NULL);
 2862                         }
 2863                         SCTP_INP_DECR_REF(inp);
 2864                         /* Switch over to the new guy */
 2865                         *inp_p = inp;
 2866                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2867                         if (send_int_conf) {
 2868                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2869                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2870                         }
 2871                         /*
 2872                          * Pull it from the incomplete queue and wake the
 2873                          * guy
 2874                          */
 2875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2876                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2877                         SCTP_TCB_UNLOCK((*stcb));
 2878                         SCTP_SOCKET_LOCK(so, 1);
 2879 #endif
 2880                         soisconnected(so);
 2881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2882                         SCTP_TCB_LOCK((*stcb));
 2883                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2884                         SCTP_SOCKET_UNLOCK(so, 1);
 2885 #endif
 2886                         return (m);
 2887                 }
 2888         }
 2889         if (notification) {
 2890                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2891         }
 2892         if (send_int_conf) {
 2893                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2894                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2895         }
 2896         return (m);
 2897 }
 2898 
 2899 static void
 2900 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
 2901     struct sctp_tcb *stcb, struct sctp_nets *net)
 2902 {
 2903         /* cp must not be used, others call this without a c-ack :-) */
 2904         struct sctp_association *asoc;
 2905 
 2906         SCTPDBG(SCTP_DEBUG_INPUT2,
 2907             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
 2908         if ((stcb == NULL) || (net == NULL)) {
 2909                 return;
 2910         }
 2911         asoc = &stcb->asoc;
 2912 
 2913         sctp_stop_all_cookie_timers(stcb);
 2914         /* process according to association state */
 2915         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
 2916                 /* state change only needed when I am in right state */
 2917                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
 2918                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 2919                 sctp_start_net_timers(stcb);
 2920                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 2921                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 2922                             stcb->sctp_ep, stcb, asoc->primary_destination);
 2923 
 2924                 }
 2925                 /* update RTO */
 2926                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 2927                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 2928                 if (asoc->overall_error_count == 0) {
 2929                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
 2930                             &asoc->time_entered, sctp_align_safe_nocopy,
 2931                             SCTP_RTT_FROM_NON_DATA);
 2932                 }
 2933                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 2934                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2935                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 2936                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 2937 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2938                         struct socket *so;
 2939 
 2940 #endif
 2941                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 2942 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2943                         so = SCTP_INP_SO(stcb->sctp_ep);
 2944                         atomic_add_int(&stcb->asoc.refcnt, 1);
 2945                         SCTP_TCB_UNLOCK(stcb);
 2946                         SCTP_SOCKET_LOCK(so, 1);
 2947                         SCTP_TCB_LOCK(stcb);
 2948                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2949 #endif
 2950                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
 2951                                 soisconnected(stcb->sctp_socket);
 2952                         }
 2953 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2954                         SCTP_SOCKET_UNLOCK(so, 1);
 2955 #endif
 2956                 }
 2957                 /*
 2958                  * since we did not send a HB make sure we don't double
 2959                  * things
 2960                  */
 2961                 net->hb_responded = 1;
 2962 
 2963                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 2964                         /*
 2965                          * We don't need to do the asconf thing, nor hb or
 2966                          * autoclose if the socket is closed.
 2967                          */
 2968                         goto closed_socket;
 2969                 }
 2970                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 2971                     stcb, net);
 2972 
 2973 
 2974                 if (stcb->asoc.sctp_autoclose_ticks &&
 2975                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 2976                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
 2977                             stcb->sctp_ep, stcb, NULL);
 2978                 }
 2979                 /*
 2980                  * send ASCONF if parameters are pending and ASCONFs are
 2981                  * allowed (eg. addresses changed when init/cookie echo were
 2982                  * in flight)
 2983                  */
 2984                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
 2985                     (stcb->asoc.asconf_supported == 1) &&
 2986                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
 2987 #ifdef SCTP_TIMER_BASED_ASCONF
 2988                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
 2989                             stcb->sctp_ep, stcb,
 2990                             stcb->asoc.primary_destination);
 2991 #else
 2992                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
 2993                             SCTP_ADDR_NOT_LOCKED);
 2994 #endif
 2995                 }
 2996         }
 2997 closed_socket:
 2998         /* Toss the cookie if I can */
 2999         sctp_toss_old_cookies(stcb, asoc);
 3000         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
 3001                 /* Restart the timer if we have pending data */
 3002                 struct sctp_tmit_chunk *chk;
 3003 
 3004                 chk = TAILQ_FIRST(&asoc->sent_queue);
 3005                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
 3006         }
 3007 }
 3008 
 3009 static void
 3010 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
 3011     struct sctp_tcb *stcb)
 3012 {
 3013         struct sctp_nets *net;
 3014         struct sctp_tmit_chunk *lchk;
 3015         struct sctp_ecne_chunk bkup;
 3016         uint8_t override_bit;
 3017         uint32_t tsn, window_data_tsn;
 3018         int len;
 3019         unsigned int pkt_cnt;
 3020 
 3021         len = ntohs(cp->ch.chunk_length);
 3022         if ((len != sizeof(struct sctp_ecne_chunk)) &&
 3023             (len != sizeof(struct old_sctp_ecne_chunk))) {
 3024                 return;
 3025         }
 3026         if (len == sizeof(struct old_sctp_ecne_chunk)) {
 3027                 /* Its the old format */
 3028                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
 3029                 bkup.num_pkts_since_cwr = htonl(1);
 3030                 cp = &bkup;
 3031         }
 3032         SCTP_STAT_INCR(sctps_recvecne);
 3033         tsn = ntohl(cp->tsn);
 3034         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
 3035         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
 3036         if (lchk == NULL) {
 3037                 window_data_tsn = stcb->asoc.sending_seq - 1;
 3038         } else {
 3039                 window_data_tsn = lchk->rec.data.TSN_seq;
 3040         }
 3041 
 3042         /* Find where it was sent to if possible. */
 3043         net = NULL;
 3044         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
 3045                 if (lchk->rec.data.TSN_seq == tsn) {
 3046                         net = lchk->whoTo;
 3047                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
 3048                         break;
 3049                 }
 3050                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
 3051                         break;
 3052                 }
 3053         }
 3054         if (net == NULL) {
 3055                 /*
 3056                  * What to do. A previous send of a CWR was possibly lost.
 3057                  * See how old it is, we may have it marked on the actual
 3058                  * net.
 3059                  */
 3060                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 3061                         if (tsn == net->last_cwr_tsn) {
 3062                                 /* Found him, send it off */
 3063                                 break;
 3064                         }
 3065                 }
 3066                 if (net == NULL) {
 3067                         /*
 3068                          * If we reach here, we need to send a special CWR
 3069                          * that says hey, we did this a long time ago and
 3070                          * you lost the response.
 3071                          */
 3072                         net = TAILQ_FIRST(&stcb->asoc.nets);
 3073                         if (net == NULL) {
 3074                                 /* TSNH */
 3075                                 return;
 3076                         }
 3077                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
 3078                 } else {
 3079                         override_bit = 0;
 3080                 }
 3081         } else {
 3082                 override_bit = 0;
 3083         }
 3084         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
 3085             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
 3086                 /*
 3087                  * JRS - Use the congestion control given in the pluggable
 3088                  * CC module
 3089                  */
 3090                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
 3091                 /*
 3092                  * We reduce once every RTT. So we will only lower cwnd at
 3093                  * the next sending seq i.e. the window_data_tsn
 3094                  */
 3095                 net->cwr_window_tsn = window_data_tsn;
 3096                 net->ecn_ce_pkt_cnt += pkt_cnt;
 3097                 net->lost_cnt = pkt_cnt;
 3098                 net->last_cwr_tsn = tsn;
 3099         } else {
 3100                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
 3101                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
 3102                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
 3103                         /*
 3104                          * Another loss in the same window update how many
 3105                          * marks/packets lost we have had.
 3106                          */
 3107                         int cnt = 1;
 3108 
 3109                         if (pkt_cnt > net->lost_cnt) {
 3110                                 /* Should be the case */
 3111                                 cnt = (pkt_cnt - net->lost_cnt);
 3112                                 net->ecn_ce_pkt_cnt += cnt;
 3113                         }
 3114                         net->lost_cnt = pkt_cnt;
 3115                         net->last_cwr_tsn = tsn;
 3116                         /*
 3117                          * Most CC functions will ignore this call, since we
 3118                          * are in-window yet of the initial CE the peer saw.
 3119                          */
 3120                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
 3121                 }
 3122         }
 3123         /*
 3124          * We always send a CWR this way if our previous one was lost our
 3125          * peer will get an update, or if it is not time again to reduce we
 3126          * still get the cwr to the peer. Note we set the override when we
 3127          * could not find the TSN on the chunk or the destination network.
 3128          */
 3129         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
 3130 }
 3131 
 3132 static void
 3133 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
 3134 {
 3135         /*
 3136          * Here we get a CWR from the peer. We must look in the outqueue and
 3137          * make sure that we have a covered ECNE in the control chunk part.
 3138          * If so remove it.
 3139          */
 3140         struct sctp_tmit_chunk *chk;
 3141         struct sctp_ecne_chunk *ecne;
 3142         int override;
 3143         uint32_t cwr_tsn;
 3144 
 3145         cwr_tsn = ntohl(cp->tsn);
 3146         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
 3147         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 3148                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
 3149                         continue;
 3150                 }
 3151                 if ((override == 0) && (chk->whoTo != net)) {
 3152                         /* Must be from the right src unless override is set */
 3153                         continue;
 3154                 }
 3155                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
 3156                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
 3157                         /* this covers this ECNE, we can remove it */
 3158                         stcb->asoc.ecn_echo_cnt_onq--;
 3159                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
 3160                             sctp_next);
 3161                         sctp_m_freem(chk->data);
 3162                         chk->data = NULL;
 3163                         stcb->asoc.ctrl_queue_cnt--;
 3164                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 3165                         if (override == 0) {
 3166                                 break;
 3167                         }
 3168                 }
 3169         }
 3170 }
 3171 
 3172 static void
 3173 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
 3174     struct sctp_tcb *stcb, struct sctp_nets *net)
 3175 {
 3176         struct sctp_association *asoc;
 3177 
 3178 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3179         struct socket *so;
 3180 
 3181 #endif
 3182 
 3183         SCTPDBG(SCTP_DEBUG_INPUT2,
 3184             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
 3185         if (stcb == NULL)
 3186                 return;
 3187 
 3188         asoc = &stcb->asoc;
 3189         /* process according to association state */
 3190         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 3191                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
 3192                 SCTPDBG(SCTP_DEBUG_INPUT2,
 3193                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
 3194                 SCTP_TCB_UNLOCK(stcb);
 3195                 return;
 3196         }
 3197         /* notify upper layer protocol */
 3198         if (stcb->sctp_socket) {
 3199                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 3200         }
 3201 #ifdef INVARIANTS
 3202         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 3203             !TAILQ_EMPTY(&asoc->sent_queue) ||
 3204             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 3205                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
 3206         }
 3207 #endif
 3208         /* stop the timer */
 3209         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
 3210             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
 3211         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 3212         /* free the TCB */
 3213         SCTPDBG(SCTP_DEBUG_INPUT2,
 3214             "sctp_handle_shutdown_complete: calls free-asoc\n");
 3215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3216         so = SCTP_INP_SO(stcb->sctp_ep);
 3217         atomic_add_int(&stcb->asoc.refcnt, 1);
 3218         SCTP_TCB_UNLOCK(stcb);
 3219         SCTP_SOCKET_LOCK(so, 1);
 3220         SCTP_TCB_LOCK(stcb);
 3221         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 3222 #endif
 3223         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 3224             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
 3225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3226         SCTP_SOCKET_UNLOCK(so, 1);
 3227 #endif
 3228         return;
 3229 }
 3230 
 3231 static int
 3232 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
 3233     struct sctp_nets *net, uint8_t flg)
 3234 {
 3235         switch (desc->chunk_type) {
 3236         case SCTP_DATA:
 3237                 /* find the tsn to resend (possibly */
 3238                 {
 3239                         uint32_t tsn;
 3240                         struct sctp_tmit_chunk *tp1;
 3241 
 3242                         tsn = ntohl(desc->tsn_ifany);
 3243                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3244                                 if (tp1->rec.data.TSN_seq == tsn) {
 3245                                         /* found it */
 3246                                         break;
 3247                                 }
 3248                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
 3249                                         /* not found */
 3250                                         tp1 = NULL;
 3251                                         break;
 3252                                 }
 3253                         }
 3254                         if (tp1 == NULL) {
 3255                                 /*
 3256                                  * Do it the other way , aka without paying
 3257                                  * attention to queue seq order.
 3258                                  */
 3259                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
 3260                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3261                                         if (tp1->rec.data.TSN_seq == tsn) {
 3262                                                 /* found it */
 3263                                                 break;
 3264                                         }
 3265                                 }
 3266                         }
 3267                         if (tp1 == NULL) {
 3268                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
 3269                         }
 3270                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
 3271                                 uint8_t *ddp;
 3272 
 3273                                 if (((flg & SCTP_BADCRC) == 0) &&
 3274                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
 3275                                         return (0);
 3276                                 }
 3277                                 if ((stcb->asoc.peers_rwnd == 0) &&
 3278                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
 3279                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
 3280                                         return (0);
 3281                                 }
 3282                                 if (stcb->asoc.peers_rwnd == 0 &&
 3283                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
 3284                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
 3285                                         return (0);
 3286                                 }
 3287                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
 3288                                     sizeof(struct sctp_data_chunk));
 3289                                 {
 3290                                         unsigned int iii;
 3291 
 3292                                         for (iii = 0; iii < sizeof(desc->data_bytes);
 3293                                             iii++) {
 3294                                                 if (ddp[iii] != desc->data_bytes[iii]) {
 3295                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
 3296                                                         return (-1);
 3297                                                 }
 3298                                         }
 3299                                 }
 3300 
 3301                                 if (tp1->do_rtt) {
 3302                                         /*
 3303                                          * this guy had a RTO calculation
 3304                                          * pending on it, cancel it
 3305                                          */
 3306                                         if (tp1->whoTo->rto_needed == 0) {
 3307                                                 tp1->whoTo->rto_needed = 1;
 3308                                         }
 3309                                         tp1->do_rtt = 0;
 3310                                 }
 3311                                 SCTP_STAT_INCR(sctps_pdrpmark);
 3312                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
 3313                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3314                                 /*
 3315                                  * mark it as if we were doing a FR, since
 3316                                  * we will be getting gap ack reports behind
 3317                                  * the info from the router.
 3318                                  */
 3319                                 tp1->rec.data.doing_fast_retransmit = 1;
 3320                                 /*
 3321                                  * mark the tsn with what sequences can
 3322                                  * cause a new FR.
 3323                                  */
 3324                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 3325                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 3326                                 } else {
 3327                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
 3328                                 }
 3329 
 3330                                 /* restart the timer */
 3331                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 3332                                     stcb, tp1->whoTo,
 3333                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
 3334                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 3335                                     stcb, tp1->whoTo);
 3336 
 3337                                 /* fix counts and things */
 3338                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 3339                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
 3340                                             tp1->whoTo->flight_size,
 3341                                             tp1->book_size,
 3342                                             (uintptr_t) stcb,
 3343                                             tp1->rec.data.TSN_seq);
 3344                                 }
 3345                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 3346                                         sctp_flight_size_decrease(tp1);
 3347                                         sctp_total_flight_decrease(stcb, tp1);
 3348                                 }
 3349                                 tp1->sent = SCTP_DATAGRAM_RESEND;
 3350                         } {
 3351                                 /* audit code */
 3352                                 unsigned int audit;
 3353 
 3354                                 audit = 0;
 3355                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3356                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
 3357                                                 audit++;
 3358                                 }
 3359                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
 3360                                     sctp_next) {
 3361                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
 3362                                                 audit++;
 3363                                 }
 3364                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
 3365                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
 3366                                             audit, stcb->asoc.sent_queue_retran_cnt);
 3367 #ifndef SCTP_AUDITING_ENABLED
 3368                                         stcb->asoc.sent_queue_retran_cnt = audit;
 3369 #endif
 3370                                 }
 3371                         }
 3372                 }
 3373                 break;
 3374         case SCTP_ASCONF:
 3375                 {
 3376                         struct sctp_tmit_chunk *asconf;
 3377 
 3378                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
 3379                             sctp_next) {
 3380                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
 3381                                         break;
 3382                                 }
 3383                         }
 3384                         if (asconf) {
 3385                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 3386                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3387                                 asconf->sent = SCTP_DATAGRAM_RESEND;
 3388                                 asconf->snd_count--;
 3389                         }
 3390                 }
 3391                 break;
 3392         case SCTP_INITIATION:
 3393                 /* resend the INIT */
 3394                 stcb->asoc.dropped_special_cnt++;
 3395                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
 3396                         /*
 3397                          * If we can get it in, in a few attempts we do
 3398                          * this, otherwise we let the timer fire.
 3399                          */
 3400                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
 3401                             stcb, net,
 3402                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
 3403                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 3404                 }
 3405                 break;
 3406         case SCTP_SELECTIVE_ACK:
 3407         case SCTP_NR_SELECTIVE_ACK:
 3408                 /* resend the sack */
 3409                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
 3410                 break;
 3411         case SCTP_HEARTBEAT_REQUEST:
 3412                 /* resend a demand HB */
 3413                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
 3414                         /*
 3415                          * Only retransmit if we KNOW we wont destroy the
 3416                          * tcb
 3417                          */
 3418                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 3419                 }
 3420                 break;
 3421         case SCTP_SHUTDOWN:
 3422                 sctp_send_shutdown(stcb, net);
 3423                 break;
 3424         case SCTP_SHUTDOWN_ACK:
 3425                 sctp_send_shutdown_ack(stcb, net);
 3426                 break;
 3427         case SCTP_COOKIE_ECHO:
 3428                 {
 3429                         struct sctp_tmit_chunk *cookie;
 3430 
 3431                         cookie = NULL;
 3432                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
 3433                             sctp_next) {
 3434                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 3435                                         break;
 3436                                 }
 3437                         }
 3438                         if (cookie) {
 3439                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
 3440                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3441                                 cookie->sent = SCTP_DATAGRAM_RESEND;
 3442                                 sctp_stop_all_cookie_timers(stcb);
 3443                         }
 3444                 }
 3445                 break;
 3446         case SCTP_COOKIE_ACK:
 3447                 sctp_send_cookie_ack(stcb);
 3448                 break;
 3449         case SCTP_ASCONF_ACK:
 3450                 /* resend last asconf ack */
 3451                 sctp_send_asconf_ack(stcb);
 3452                 break;
 3453         case SCTP_FORWARD_CUM_TSN:
 3454                 send_forward_tsn(stcb, &stcb->asoc);
 3455                 break;
 3456                 /* can't do anything with these */
 3457         case SCTP_PACKET_DROPPED:
 3458         case SCTP_INITIATION_ACK:       /* this should not happen */
 3459         case SCTP_HEARTBEAT_ACK:
 3460         case SCTP_ABORT_ASSOCIATION:
 3461         case SCTP_OPERATION_ERROR:
 3462         case SCTP_SHUTDOWN_COMPLETE:
 3463         case SCTP_ECN_ECHO:
 3464         case SCTP_ECN_CWR:
 3465         default:
 3466                 break;
 3467         }
 3468         return (0);
 3469 }
 3470 
 3471 void
 3472 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
 3473 {
 3474         uint32_t i;
 3475         uint16_t temp;
 3476 
 3477         /*
 3478          * We set things to 0xffff since this is the last delivered sequence
 3479          * and we will be sending in 0 after the reset.
 3480          */
 3481 
 3482         if (number_entries) {
 3483                 for (i = 0; i < number_entries; i++) {
 3484                         temp = ntohs(list[i]);
 3485                         if (temp >= stcb->asoc.streamincnt) {
 3486                                 continue;
 3487                         }
 3488                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
 3489                 }
 3490         } else {
 3491                 list = NULL;
 3492                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
 3493                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
 3494                 }
 3495         }
 3496         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
 3497 }
 3498 
 3499 static void
 3500 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
 3501 {
 3502         uint32_t i;
 3503         uint16_t temp;
 3504 
 3505         if (number_entries > 0) {
 3506                 for (i = 0; i < number_entries; i++) {
 3507                         temp = ntohs(list[i]);
 3508                         if (temp >= stcb->asoc.streamoutcnt) {
 3509                                 /* no such stream */
 3510                                 continue;
 3511                         }
 3512                         stcb->asoc.strmout[temp].next_sequence_send = 0;
 3513                 }
 3514         } else {
 3515                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3516                         stcb->asoc.strmout[i].next_sequence_send = 0;
 3517                 }
 3518         }
 3519         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
 3520 }
 3521 
 3522 static void
 3523 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
 3524 {
 3525         uint32_t i;
 3526         uint16_t temp;
 3527 
 3528         if (number_entries > 0) {
 3529                 for (i = 0; i < number_entries; i++) {
 3530                         temp = ntohs(list[i]);
 3531                         if (temp >= stcb->asoc.streamoutcnt) {
 3532                                 /* no such stream */
 3533                                 continue;
 3534                         }
 3535                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
 3536                 }
 3537         } else {
 3538                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3539                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
 3540                 }
 3541         }
 3542 }
 3543 
 3544 
 3545 struct sctp_stream_reset_request *
 3546 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
 3547 {
 3548         struct sctp_association *asoc;
 3549         struct sctp_chunkhdr *ch;
 3550         struct sctp_stream_reset_request *r;
 3551         struct sctp_tmit_chunk *chk;
 3552         int len, clen;
 3553 
 3554         asoc = &stcb->asoc;
 3555         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
 3556                 asoc->stream_reset_outstanding = 0;
 3557                 return (NULL);
 3558         }
 3559         if (stcb->asoc.str_reset == NULL) {
 3560                 asoc->stream_reset_outstanding = 0;
 3561                 return (NULL);
 3562         }
 3563         chk = stcb->asoc.str_reset;
 3564         if (chk->data == NULL) {
 3565                 return (NULL);
 3566         }
 3567         if (bchk) {
 3568                 /* he wants a copy of the chk pointer */
 3569                 *bchk = chk;
 3570         }
 3571         clen = chk->send_size;
 3572         ch = mtod(chk->data, struct sctp_chunkhdr *);
 3573         r = (struct sctp_stream_reset_request *)(ch + 1);
 3574         if (ntohl(r->request_seq) == seq) {
 3575                 /* found it */
 3576                 return (r);
 3577         }
 3578         len = SCTP_SIZE32(ntohs(r->ph.param_length));
 3579         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
 3580                 /* move to the next one, there can only be a max of two */
 3581                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
 3582                 if (ntohl(r->request_seq) == seq) {
 3583                         return (r);
 3584                 }
 3585         }
 3586         /* that seq is not here */
 3587         return (NULL);
 3588 }
 3589 
 3590 static void
 3591 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
 3592 {
 3593         struct sctp_association *asoc;
 3594         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
 3595 
 3596         if (stcb->asoc.str_reset == NULL) {
 3597                 return;
 3598         }
 3599         asoc = &stcb->asoc;
 3600 
 3601         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
 3602             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
 3603         TAILQ_REMOVE(&asoc->control_send_queue,
 3604             chk,
 3605             sctp_next);
 3606         if (chk->data) {
 3607                 sctp_m_freem(chk->data);
 3608                 chk->data = NULL;
 3609         }
 3610         asoc->ctrl_queue_cnt--;
 3611         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 3612         /* sa_ignore NO_NULL_CHK */
 3613         stcb->asoc.str_reset = NULL;
 3614 }
 3615 
 3616 
 3617 static int
 3618 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
 3619     uint32_t seq, uint32_t action,
 3620     struct sctp_stream_reset_response *respin)
 3621 {
 3622         uint16_t type;
 3623         int lparm_len;
 3624         struct sctp_association *asoc = &stcb->asoc;
 3625         struct sctp_tmit_chunk *chk;
 3626         struct sctp_stream_reset_request *req_param;
 3627         struct sctp_stream_reset_out_request *req_out_param;
 3628         struct sctp_stream_reset_in_request *req_in_param;
 3629         uint32_t number_entries;
 3630 
 3631         if (asoc->stream_reset_outstanding == 0) {
 3632                 /* duplicate */
 3633                 return (0);
 3634         }
 3635         if (seq == stcb->asoc.str_reset_seq_out) {
 3636                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
 3637                 if (req_param != NULL) {
 3638                         stcb->asoc.str_reset_seq_out++;
 3639                         type = ntohs(req_param->ph.param_type);
 3640                         lparm_len = ntohs(req_param->ph.param_length);
 3641                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
 3642                                 int no_clear = 0;
 3643 
 3644                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
 3645                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
 3646                                 asoc->stream_reset_out_is_outstanding = 0;
 3647                                 if (asoc->stream_reset_outstanding)
 3648                                         asoc->stream_reset_outstanding--;
 3649                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3650                                         /* do it */
 3651                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
 3652                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3653                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
 3654                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
 3655                                         /*
 3656                                          * Set it up so we don't stop
 3657                                          * retransmitting
 3658                                          */
 3659                                         asoc->stream_reset_outstanding++;
 3660                                         stcb->asoc.str_reset_seq_out--;
 3661                                         asoc->stream_reset_out_is_outstanding = 1;
 3662                                         no_clear = 1;
 3663                                 } else {
 3664                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
 3665                                 }
 3666                                 if (no_clear == 0) {
 3667                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
 3668                                 }
 3669                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
 3670                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
 3671                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
 3672                                 if (asoc->stream_reset_outstanding)
 3673                                         asoc->stream_reset_outstanding--;
 3674                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3675                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
 3676                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
 3677                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3678                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
 3679                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
 3680                                 }
 3681                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
 3682                                 /* Ok we now may have more streams */
 3683                                 int num_stream;
 3684 
 3685                                 num_stream = stcb->asoc.strm_pending_add_size;
 3686                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
 3687                                         /* TSNH */
 3688                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
 3689                                 }
 3690                                 stcb->asoc.strm_pending_add_size = 0;
 3691                                 if (asoc->stream_reset_outstanding)
 3692                                         asoc->stream_reset_outstanding--;
 3693                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3694                                         /* Put the new streams into effect */
 3695                                         int i;
 3696 
 3697                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
 3698                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
 3699                                         }
 3700                                         asoc->streamoutcnt += num_stream;
 3701                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
 3702                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3703                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3704                                             SCTP_STREAM_CHANGE_DENIED);
 3705                                 } else {
 3706                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3707                                             SCTP_STREAM_CHANGE_FAILED);
 3708                                 }
 3709                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
 3710                                 if (asoc->stream_reset_outstanding)
 3711                                         asoc->stream_reset_outstanding--;
 3712                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3713                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3714                                             SCTP_STREAM_CHANGE_DENIED);
 3715                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3716                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3717                                             SCTP_STREAM_CHANGE_FAILED);
 3718                                 }
 3719                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
 3720                                 /**
 3721                                  * a) Adopt the new in tsn.
 3722                                  * b) reset the map
 3723                                  * c) Adopt the new out-tsn
 3724                                  */
 3725                                 struct sctp_stream_reset_response_tsn *resp;
 3726                                 struct sctp_forward_tsn_chunk fwdtsn;
 3727                                 int abort_flag = 0;
 3728 
 3729                                 if (respin == NULL) {
 3730                                         /* huh ? */
 3731                                         return (0);
 3732                                 }
 3733                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
 3734                                         return (0);
 3735                                 }
 3736                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3737                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
 3738                                         asoc->stream_reset_outstanding--;
 3739                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
 3740                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 3741                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
 3742                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
 3743                                         if (abort_flag) {
 3744                                                 return (1);
 3745                                         }
 3746                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
 3747                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 3748                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 3749                                         }
 3750                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
 3751                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
 3752                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
 3753 
 3754                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
 3755                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
 3756 
 3757                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
 3758                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
 3759 
 3760                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
 3761                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
 3762                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
 3763                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3764                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
 3765                                             SCTP_ASSOC_RESET_DENIED);
 3766                                 } else {
 3767                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
 3768                                             SCTP_ASSOC_RESET_FAILED);
 3769                                 }
 3770                         }
 3771                         /* get rid of the request and get the request flags */
 3772                         if (asoc->stream_reset_outstanding == 0) {
 3773                                 sctp_clean_up_stream_reset(stcb);
 3774                         }
 3775                 }
 3776         }
 3777         if (asoc->stream_reset_outstanding == 0) {
 3778                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
 3779         }
 3780         return (0);
 3781 }
 3782 
 3783 static void
 3784 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
 3785     struct sctp_tmit_chunk *chk,
 3786     struct sctp_stream_reset_in_request *req, int trunc)
 3787 {
 3788         uint32_t seq;
 3789         int len, i;
 3790         int number_entries;
 3791         uint16_t temp;
 3792 
 3793         /*
 3794          * peer wants me to send a str-reset to him for my outgoing seq's if
 3795          * seq_in is right.
 3796          */
 3797         struct sctp_association *asoc = &stcb->asoc;
 3798 
 3799         seq = ntohl(req->request_seq);
 3800         if (asoc->str_reset_seq_in == seq) {
 3801                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3802                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
 3803                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3804                 } else if (trunc) {
 3805                         /* Can't do it, since they exceeded our buffer size  */
 3806                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3807                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
 3808                         len = ntohs(req->ph.param_length);
 3809                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
 3810                         if (number_entries) {
 3811                                 for (i = 0; i < number_entries; i++) {
 3812                                         temp = ntohs(req->list_of_streams[i]);
 3813                                         if (temp >= stcb->asoc.streamoutcnt) {
 3814                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3815                                                 goto bad_boy;
 3816                                         }
 3817                                         req->list_of_streams[i] = temp;
 3818                                 }
 3819                                 for (i = 0; i < number_entries; i++) {
 3820                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
 3821                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
 3822                                         }
 3823                                 }
 3824                         } else {
 3825                                 /* Its all */
 3826                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3827                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
 3828                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
 3829                                 }
 3830                         }
 3831                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3832                 } else {
 3833                         /* Can't do it, since we have sent one out */
 3834                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
 3835                 }
 3836 bad_boy:
 3837                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3838                 asoc->str_reset_seq_in++;
 3839         } else if (asoc->str_reset_seq_in - 1 == seq) {
 3840                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3841         } else if (asoc->str_reset_seq_in - 2 == seq) {
 3842                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 3843         } else {
 3844                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 3845         }
 3846         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
 3847 }
 3848 
 3849 static int
 3850 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
 3851     struct sctp_tmit_chunk *chk,
 3852     struct sctp_stream_reset_tsn_request *req)
 3853 {
 3854         /* reset all in and out and update the tsn */
 3855         /*
 3856          * A) reset my str-seq's on in and out. B) Select a receive next,
 3857          * and set cum-ack to it. Also process this selected number as a
 3858          * fwd-tsn as well. C) set in the response my next sending seq.
 3859          */
 3860         struct sctp_forward_tsn_chunk fwdtsn;
 3861         struct sctp_association *asoc = &stcb->asoc;
 3862         int abort_flag = 0;
 3863         uint32_t seq;
 3864 
 3865         seq = ntohl(req->request_seq);
 3866         if (asoc->str_reset_seq_in == seq) {
 3867                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
 3868                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 3869                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3870                 } else {
 3871                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
 3872                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 3873                         fwdtsn.ch.chunk_flags = 0;
 3874                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
 3875                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
 3876                         if (abort_flag) {
 3877                                 return (1);
 3878                         }
 3879                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
 3880                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 3881                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 3882                         }
 3883                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
 3884                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
 3885                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
 3886                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 3887                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
 3888                         atomic_add_int(&asoc->sending_seq, 1);
 3889                         /* save off historical data for retrans */
 3890                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
 3891                         asoc->last_sending_seq[0] = asoc->sending_seq;
 3892                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
 3893                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
 3894                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
 3895                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
 3896                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3897                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
 3898                 }
 3899                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
 3900                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
 3901                 asoc->str_reset_seq_in++;
 3902         } else if (asoc->str_reset_seq_in - 1 == seq) {
 3903                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
 3904                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
 3905         } else if (asoc->str_reset_seq_in - 2 == seq) {
 3906                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
 3907                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
 3908         } else {
 3909                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 3910         }
 3911         return (0);
 3912 }
 3913 
 3914 static void
 3915 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
 3916     struct sctp_tmit_chunk *chk,
 3917     struct sctp_stream_reset_out_request *req, int trunc)
 3918 {
 3919         uint32_t seq, tsn;
 3920         int number_entries, len;
 3921         struct sctp_association *asoc = &stcb->asoc;
 3922 
 3923         seq = ntohl(req->request_seq);
 3924 
 3925         /* now if its not a duplicate we process it */
 3926         if (asoc->str_reset_seq_in == seq) {
 3927                 len = ntohs(req->ph.param_length);
 3928                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
 3929                 /*
 3930                  * the sender is resetting, handle the list issue.. we must
 3931                  * a) verify if we can do the reset, if so no problem b) If
 3932                  * we can't do the reset we must copy the request. c) queue
 3933                  * it, and setup the data in processor to trigger it off
 3934                  * when needed and dequeue all the queued data.
 3935                  */
 3936                 tsn = ntohl(req->send_reset_at_tsn);
 3937 
 3938                 /* move the reset action back one */
 3939                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3940                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
 3941                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3942                 } else if (trunc) {
 3943                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3944                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
 3945                         /* we can do it now */
 3946                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
 3947                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3948                 } else {
 3949                         /*
 3950                          * we must queue it up and thus wait for the TSN's
 3951                          * to arrive that are at or before tsn
 3952                          */
 3953                         struct sctp_stream_reset_list *liste;
 3954                         int siz;
 3955 
 3956                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
 3957                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
 3958                             siz, SCTP_M_STRESET);
 3959                         if (liste == NULL) {
 3960                                 /* gak out of memory */
 3961                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3962                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3963                                 return;
 3964                         }
 3965                         liste->seq = seq;
 3966                         liste->tsn = tsn;
 3967                         liste->number_entries = number_entries;
 3968                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
 3969                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
 3970                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
 3971                 }
 3972                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3973                 asoc->str_reset_seq_in++;
 3974         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 3975                 /*
 3976                  * one seq back, just echo back last action since my
 3977                  * response was lost.
 3978                  */
 3979                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3980         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 3981                 /*
 3982                  * two seq back, just echo back last action since my
 3983                  * response was lost.
 3984                  */
 3985                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 3986         } else {
 3987                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 3988         }
 3989 }
 3990 
 3991 static void
 3992 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
 3993     struct sctp_stream_reset_add_strm *str_add)
 3994 {
 3995         /*
 3996          * Peer is requesting to add more streams. If its within our
 3997          * max-streams we will allow it.
 3998          */
 3999         uint32_t num_stream, i;
 4000         uint32_t seq;
 4001         struct sctp_association *asoc = &stcb->asoc;
 4002         struct sctp_queued_to_read *ctl, *nctl;
 4003 
 4004         /* Get the number. */
 4005         seq = ntohl(str_add->request_seq);
 4006         num_stream = ntohs(str_add->number_of_streams);
 4007         /* Now what would be the new total? */
 4008         if (asoc->str_reset_seq_in == seq) {
 4009                 num_stream += stcb->asoc.streamincnt;
 4010                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
 4011                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 4012                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4013                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
 4014                     (num_stream > 0xffff)) {
 4015                         /* We must reject it they ask for to many */
 4016         denied:
 4017                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4018                 } else {
 4019                         /* Ok, we can do that :-) */
 4020                         struct sctp_stream_in *oldstrm;
 4021 
 4022                         /* save off the old */
 4023                         oldstrm = stcb->asoc.strmin;
 4024                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
 4025                             (num_stream * sizeof(struct sctp_stream_in)),
 4026                             SCTP_M_STRMI);
 4027                         if (stcb->asoc.strmin == NULL) {
 4028                                 stcb->asoc.strmin = oldstrm;
 4029                                 goto denied;
 4030                         }
 4031                         /* copy off the old data */
 4032                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
 4033                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
 4034                                 stcb->asoc.strmin[i].stream_no = i;
 4035                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
 4036                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
 4037                                 /* now anything on those queues? */
 4038                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
 4039                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
 4040                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
 4041                                 }
 4042                         }
 4043                         /* Init the new streams */
 4044                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
 4045                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
 4046                                 stcb->asoc.strmin[i].stream_no = i;
 4047                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
 4048                                 stcb->asoc.strmin[i].delivery_started = 0;
 4049                         }
 4050                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
 4051                         /* update the size */
 4052                         stcb->asoc.streamincnt = num_stream;
 4053                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 4054                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
 4055                 }
 4056                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4057                 asoc->str_reset_seq_in++;
 4058         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 4059                 /*
 4060                  * one seq back, just echo back last action since my
 4061                  * response was lost.
 4062                  */
 4063                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4064         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 4065                 /*
 4066                  * two seq back, just echo back last action since my
 4067                  * response was lost.
 4068                  */
 4069                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 4070         } else {
 4071                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 4072 
 4073         }
 4074 }
 4075 
 4076 static void
 4077 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
 4078     struct sctp_stream_reset_add_strm *str_add)
 4079 {
 4080         /*
 4081          * Peer is requesting to add more streams. If its within our
 4082          * max-streams we will allow it.
 4083          */
 4084         uint16_t num_stream;
 4085         uint32_t seq;
 4086         struct sctp_association *asoc = &stcb->asoc;
 4087 
 4088         /* Get the number. */
 4089         seq = ntohl(str_add->request_seq);
 4090         num_stream = ntohs(str_add->number_of_streams);
 4091         /* Now what would be the new total? */
 4092         if (asoc->str_reset_seq_in == seq) {
 4093                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
 4094                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 4095                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4096                 } else if (stcb->asoc.stream_reset_outstanding) {
 4097                         /* We must reject it we have something pending */
 4098                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
 4099                 } else {
 4100                         /* Ok, we can do that :-) */
 4101                         int mychk;
 4102 
 4103                         mychk = stcb->asoc.streamoutcnt;
 4104                         mychk += num_stream;
 4105                         if (mychk < 0x10000) {
 4106                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 4107                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
 4108                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4109                                 }
 4110                         } else {
 4111                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4112                         }
 4113                 }
 4114                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
 4115                 asoc->str_reset_seq_in++;
 4116         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 4117                 /*
 4118                  * one seq back, just echo back last action since my
 4119                  * response was lost.
 4120                  */
 4121                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4122         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 4123                 /*
 4124                  * two seq back, just echo back last action since my
 4125                  * response was lost.
 4126                  */
 4127                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 4128         } else {
 4129                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 4130         }
 4131 }
 4132 
 4133 #ifdef __GNUC__
 4134 __attribute__((noinline))
 4135 #endif
 4136         static int
 4137             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
 4138         struct sctp_chunkhdr *ch_req)
 4139 {
 4140         uint16_t remaining_length, param_len, ptype;
 4141         struct sctp_paramhdr pstore;
 4142         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
 4143         uint32_t seq = 0;
 4144         int num_req = 0;
 4145         int trunc = 0;
 4146         struct sctp_tmit_chunk *chk;
 4147         struct sctp_chunkhdr *ch;
 4148         struct sctp_paramhdr *ph;
 4149         int ret_code = 0;
 4150         int num_param = 0;
 4151 
 4152         /* now it may be a reset or a reset-response */
 4153         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
 4154 
 4155         /* setup for adding the response */
 4156         sctp_alloc_a_chunk(stcb, chk);
 4157         if (chk == NULL) {
 4158                 return (ret_code);
 4159         }
 4160         chk->copy_by_ref = 0;
 4161         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
 4162         chk->rec.chunk_id.can_take_data = 0;
 4163         chk->flags = 0;
 4164         chk->asoc = &stcb->asoc;
 4165         chk->no_fr_allowed = 0;
 4166         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
 4167         chk->book_size_scale = 0;
 4168         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
 4169         if (chk->data == NULL) {
 4170 strres_nochunk:
 4171                 if (chk->data) {
 4172                         sctp_m_freem(chk->data);
 4173                         chk->data = NULL;
 4174                 }
 4175                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 4176                 return (ret_code);
 4177         }
 4178         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
 4179 
 4180         /* setup chunk parameters */
 4181         chk->sent = SCTP_DATAGRAM_UNSENT;
 4182         chk->snd_count = 0;
 4183         chk->whoTo = NULL;
 4184 
 4185         ch = mtod(chk->data, struct sctp_chunkhdr *);
 4186         ch->chunk_type = SCTP_STREAM_RESET;
 4187         ch->chunk_flags = 0;
 4188         ch->chunk_length = htons(chk->send_size);
 4189         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
 4190         offset += sizeof(struct sctp_chunkhdr);
 4191         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
 4192                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
 4193                 if (ph == NULL) {
 4194                         /* TSNH */
 4195                         break;
 4196                 }
 4197                 param_len = ntohs(ph->param_length);
 4198                 if ((param_len > remaining_length) ||
 4199                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
 4200                         /* bad parameter length */
 4201                         break;
 4202                 }
 4203                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
 4204                     (uint8_t *) & cstore);
 4205                 if (ph == NULL) {
 4206                         /* TSNH */
 4207                         break;
 4208                 }
 4209                 ptype = ntohs(ph->param_type);
 4210                 num_param++;
 4211                 if (param_len > sizeof(cstore)) {
 4212                         trunc = 1;
 4213                 } else {
 4214                         trunc = 0;
 4215                 }
 4216                 if (num_param > SCTP_MAX_RESET_PARAMS) {
 4217                         /* hit the max of parameters already sorry.. */
 4218                         break;
 4219                 }
 4220                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
 4221                         struct sctp_stream_reset_out_request *req_out;
 4222 
 4223                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
 4224                                 break;
 4225                         }
 4226                         req_out = (struct sctp_stream_reset_out_request *)ph;
 4227                         num_req++;
 4228                         if (stcb->asoc.stream_reset_outstanding) {
 4229                                 seq = ntohl(req_out->response_seq);
 4230                                 if (seq == stcb->asoc.str_reset_seq_out) {
 4231                                         /* implicit ack */
 4232                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
 4233                                 }
 4234                         }
 4235                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
 4236                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
 4237                         struct sctp_stream_reset_add_strm *str_add;
 4238 
 4239                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
 4240                                 break;
 4241                         }
 4242                         str_add = (struct sctp_stream_reset_add_strm *)ph;
 4243                         num_req++;
 4244                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
 4245                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
 4246                         struct sctp_stream_reset_add_strm *str_add;
 4247 
 4248                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
 4249                                 break;
 4250                         }
 4251                         str_add = (struct sctp_stream_reset_add_strm *)ph;
 4252                         num_req++;
 4253                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
 4254                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
 4255                         struct sctp_stream_reset_in_request *req_in;
 4256 
 4257                         num_req++;
 4258                         req_in = (struct sctp_stream_reset_in_request *)ph;
 4259                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
 4260                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
 4261                         struct sctp_stream_reset_tsn_request *req_tsn;
 4262 
 4263                         num_req++;
 4264                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
 4265                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
 4266                                 ret_code = 1;
 4267                                 goto strres_nochunk;
 4268                         }
 4269                         /* no more */
 4270                         break;
 4271                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
 4272                         struct sctp_stream_reset_response *resp;
 4273                         uint32_t result;
 4274 
 4275                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
 4276                                 break;
 4277                         }
 4278                         resp = (struct sctp_stream_reset_response *)ph;
 4279                         seq = ntohl(resp->response_seq);
 4280                         result = ntohl(resp->result);
 4281                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
 4282                                 ret_code = 1;
 4283                                 goto strres_nochunk;
 4284                         }
 4285                 } else {
 4286                         break;
 4287                 }
 4288                 offset += SCTP_SIZE32(param_len);
 4289                 if (remaining_length >= SCTP_SIZE32(param_len)) {
 4290                         remaining_length -= SCTP_SIZE32(param_len);
 4291                 } else {
 4292                         remaining_length = 0;
 4293                 }
 4294         }
 4295         if (num_req == 0) {
 4296                 /* we have no response free the stuff */
 4297                 goto strres_nochunk;
 4298         }
 4299         /* ok we have a chunk to link in */
 4300         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
 4301             chk,
 4302             sctp_next);
 4303         stcb->asoc.ctrl_queue_cnt++;
 4304         return (ret_code);
 4305 }
 4306 
 4307 /*
 4308  * Handle a router or endpoints report of a packet loss, there are two ways
 4309  * to handle this, either we get the whole packet and must disect it
 4310  * ourselves (possibly with truncation and or corruption) or it is a summary
 4311  * from a middle box that did the disectting for us.
 4312  */
 4313 static void
 4314 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
 4315     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
 4316 {
 4317         uint32_t bottle_bw, on_queue;
 4318         uint16_t trunc_len;
 4319         unsigned int chlen;
 4320         unsigned int at;
 4321         struct sctp_chunk_desc desc;
 4322         struct sctp_chunkhdr *ch;
 4323 
 4324         chlen = ntohs(cp->ch.chunk_length);
 4325         chlen -= sizeof(struct sctp_pktdrop_chunk);
 4326         /* XXX possible chlen underflow */
 4327         if (chlen == 0) {
 4328                 ch = NULL;
 4329                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
 4330                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
 4331         } else {
 4332                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
 4333                 chlen -= sizeof(struct sctphdr);
 4334                 /* XXX possible chlen underflow */
 4335                 memset(&desc, 0, sizeof(desc));
 4336         }
 4337         trunc_len = (uint16_t) ntohs(cp->trunc_len);
 4338         if (trunc_len > limit) {
 4339                 trunc_len = limit;
 4340         }
 4341         /* now the chunks themselves */
 4342         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
 4343                 desc.chunk_type = ch->chunk_type;
 4344                 /* get amount we need to move */
 4345                 at = ntohs(ch->chunk_length);
 4346                 if (at < sizeof(struct sctp_chunkhdr)) {
 4347                         /* corrupt chunk, maybe at the end? */
 4348                         SCTP_STAT_INCR(sctps_pdrpcrupt);
 4349                         break;
 4350                 }
 4351                 if (trunc_len == 0) {
 4352                         /* we are supposed to have all of it */
 4353                         if (at > chlen) {
 4354                                 /* corrupt skip it */
 4355                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
 4356                                 break;
 4357                         }
 4358                 } else {
 4359                         /* is there enough of it left ? */
 4360                         if (desc.chunk_type == SCTP_DATA) {
 4361                                 if (chlen < (sizeof(struct sctp_data_chunk) +
 4362                                     sizeof(desc.data_bytes))) {
 4363                                         break;
 4364                                 }
 4365                         } else {
 4366                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
 4367                                         break;
 4368                                 }
 4369                         }
 4370                 }
 4371                 if (desc.chunk_type == SCTP_DATA) {
 4372                         /* can we get out the tsn? */
 4373                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
 4374                                 SCTP_STAT_INCR(sctps_pdrpmbda);
 4375 
 4376                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
 4377                                 /* yep */
 4378                                 struct sctp_data_chunk *dcp;
 4379                                 uint8_t *ddp;
 4380                                 unsigned int iii;
 4381 
 4382                                 dcp = (struct sctp_data_chunk *)ch;
 4383                                 ddp = (uint8_t *) (dcp + 1);
 4384                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
 4385                                         desc.data_bytes[iii] = ddp[iii];
 4386                                 }
 4387                                 desc.tsn_ifany = dcp->dp.tsn;
 4388                         } else {
 4389                                 /* nope we are done. */
 4390                                 SCTP_STAT_INCR(sctps_pdrpnedat);
 4391                                 break;
 4392                         }
 4393                 } else {
 4394                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
 4395                                 SCTP_STAT_INCR(sctps_pdrpmbct);
 4396                 }
 4397 
 4398                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
 4399                         SCTP_STAT_INCR(sctps_pdrppdbrk);
 4400                         break;
 4401                 }
 4402                 if (SCTP_SIZE32(at) > chlen) {
 4403                         break;
 4404                 }
 4405                 chlen -= SCTP_SIZE32(at);
 4406                 if (chlen < sizeof(struct sctp_chunkhdr)) {
 4407                         /* done, none left */
 4408                         break;
 4409                 }
 4410                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
 4411         }
 4412         /* Now update any rwnd --- possibly */
 4413         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
 4414                 /* From a peer, we get a rwnd report */
 4415                 uint32_t a_rwnd;
 4416 
 4417                 SCTP_STAT_INCR(sctps_pdrpfehos);
 4418 
 4419                 bottle_bw = ntohl(cp->bottle_bw);
 4420                 on_queue = ntohl(cp->current_onq);
 4421                 if (bottle_bw && on_queue) {
 4422                         /* a rwnd report is in here */
 4423                         if (bottle_bw > on_queue)
 4424                                 a_rwnd = bottle_bw - on_queue;
 4425                         else
 4426                                 a_rwnd = 0;
 4427 
 4428                         if (a_rwnd == 0)
 4429                                 stcb->asoc.peers_rwnd = 0;
 4430                         else {
 4431                                 if (a_rwnd > stcb->asoc.total_flight) {
 4432                                         stcb->asoc.peers_rwnd =
 4433                                             a_rwnd - stcb->asoc.total_flight;
 4434                                 } else {
 4435                                         stcb->asoc.peers_rwnd = 0;
 4436                                 }
 4437                                 if (stcb->asoc.peers_rwnd <
 4438                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 4439                                         /* SWS sender side engages */
 4440                                         stcb->asoc.peers_rwnd = 0;
 4441                                 }
 4442                         }
 4443                 }
 4444         } else {
 4445                 SCTP_STAT_INCR(sctps_pdrpfmbox);
 4446         }
 4447 
 4448         /* now middle boxes in sat networks get a cwnd bump */
 4449         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
 4450             (stcb->asoc.sat_t3_loss_recovery == 0) &&
 4451             (stcb->asoc.sat_network)) {
 4452                 /*
 4453                  * This is debateable but for sat networks it makes sense
 4454                  * Note if a T3 timer has went off, we will prohibit any
 4455                  * changes to cwnd until we exit the t3 loss recovery.
 4456                  */
 4457                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
 4458                     net, cp, &bottle_bw, &on_queue);
 4459         }
 4460 }
 4461 
 4462 /*
 4463  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
 4464  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
 4465  * offset: offset into the mbuf chain to first chunkhdr - length: is the
 4466  * length of the complete packet outputs: - length: modified to remaining
 4467  * length after control processing - netp: modified to new sctp_nets after
 4468  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
 4469  * bad packet,...) otherwise return the tcb for this packet
 4470  */
 4471 #ifdef __GNUC__
 4472 __attribute__((noinline))
 4473 #endif
 4474         static struct sctp_tcb *
 4475                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
 4476              struct sockaddr *src, struct sockaddr *dst,
 4477              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
 4478              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
 4479              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
 4480              uint32_t vrf_id, uint16_t port)
 4481 {
 4482         struct sctp_association *asoc;
 4483         struct mbuf *op_err;
 4484         char msg[SCTP_DIAG_INFO_LEN];
 4485         uint32_t vtag_in;
 4486         int num_chunks = 0;     /* number of control chunks processed */
 4487         uint32_t chk_length;
 4488         int ret;
 4489         int abort_no_unlock = 0;
 4490         int ecne_seen = 0;
 4491 
 4492         /*
 4493          * How big should this be, and should it be alloc'd? Lets try the
 4494          * d-mtu-ceiling for now (2k) and that should hopefully work ...
 4495          * until we get into jumbo grams and such..
 4496          */
 4497         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
 4498         struct sctp_tcb *locked_tcb = stcb;
 4499         int got_auth = 0;
 4500         uint32_t auth_offset = 0, auth_len = 0;
 4501         int auth_skipped = 0;
 4502         int asconf_cnt = 0;
 4503 
 4504 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4505         struct socket *so;
 4506 
 4507 #endif
 4508 
 4509         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
 4510             iphlen, *offset, length, (void *)stcb);
 4511 
 4512         /* validate chunk header length... */
 4513         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
 4514                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
 4515                     ntohs(ch->chunk_length));
 4516                 if (locked_tcb) {
 4517                         SCTP_TCB_UNLOCK(locked_tcb);
 4518                 }
 4519                 return (NULL);
 4520         }
 4521         /*
 4522          * validate the verification tag
 4523          */
 4524         vtag_in = ntohl(sh->v_tag);
 4525 
 4526         if (locked_tcb) {
 4527                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
 4528         }
 4529         if (ch->chunk_type == SCTP_INITIATION) {
 4530                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
 4531                     ntohs(ch->chunk_length), vtag_in);
 4532                 if (vtag_in != 0) {
 4533                         /* protocol error- silently discard... */
 4534                         SCTP_STAT_INCR(sctps_badvtag);
 4535                         if (locked_tcb) {
 4536                                 SCTP_TCB_UNLOCK(locked_tcb);
 4537                         }
 4538                         return (NULL);
 4539                 }
 4540         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
 4541                 /*
 4542                  * If there is no stcb, skip the AUTH chunk and process
 4543                  * later after a stcb is found (to validate the lookup was
 4544                  * valid.
 4545                  */
 4546                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
 4547                     (stcb == NULL) &&
 4548                     (inp->auth_supported == 1)) {
 4549                         /* save this chunk for later processing */
 4550                         auth_skipped = 1;
 4551                         auth_offset = *offset;
 4552                         auth_len = ntohs(ch->chunk_length);
 4553 
 4554                         /* (temporarily) move past this chunk */
 4555                         *offset += SCTP_SIZE32(auth_len);
 4556                         if (*offset >= length) {
 4557                                 /* no more data left in the mbuf chain */
 4558                                 *offset = length;
 4559                                 if (locked_tcb) {
 4560                                         SCTP_TCB_UNLOCK(locked_tcb);
 4561                                 }
 4562                                 return (NULL);
 4563                         }
 4564                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4565                             sizeof(struct sctp_chunkhdr), chunk_buf);
 4566                 }
 4567                 if (ch == NULL) {
 4568                         /* Help */
 4569                         *offset = length;
 4570                         if (locked_tcb) {
 4571                                 SCTP_TCB_UNLOCK(locked_tcb);
 4572                         }
 4573                         return (NULL);
 4574                 }
 4575                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
 4576                         goto process_control_chunks;
 4577                 }
 4578                 /*
 4579                  * first check if it's an ASCONF with an unknown src addr we
 4580                  * need to look inside to find the association
 4581                  */
 4582                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
 4583                         struct sctp_chunkhdr *asconf_ch = ch;
 4584                         uint32_t asconf_offset = 0, asconf_len = 0;
 4585 
 4586                         /* inp's refcount may be reduced */
 4587                         SCTP_INP_INCR_REF(inp);
 4588 
 4589                         asconf_offset = *offset;
 4590                         do {
 4591                                 asconf_len = ntohs(asconf_ch->chunk_length);
 4592                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
 4593                                         break;
 4594                                 stcb = sctp_findassociation_ep_asconf(m,
 4595                                     *offset,
 4596                                     dst,
 4597                                     sh, &inp, netp, vrf_id);
 4598                                 if (stcb != NULL)
 4599                                         break;
 4600                                 asconf_offset += SCTP_SIZE32(asconf_len);
 4601                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
 4602                                     sizeof(struct sctp_chunkhdr), chunk_buf);
 4603                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
 4604                         if (stcb == NULL) {
 4605                                 /*
 4606                                  * reduce inp's refcount if not reduced in
 4607                                  * sctp_findassociation_ep_asconf().
 4608                                  */
 4609                                 SCTP_INP_DECR_REF(inp);
 4610                         } else {
 4611                                 locked_tcb = stcb;
 4612                         }
 4613 
 4614                         /* now go back and verify any auth chunk to be sure */
 4615                         if (auth_skipped && (stcb != NULL)) {
 4616                                 struct sctp_auth_chunk *auth;
 4617 
 4618                                 auth = (struct sctp_auth_chunk *)
 4619                                     sctp_m_getptr(m, auth_offset,
 4620                                     auth_len, chunk_buf);
 4621                                 got_auth = 1;
 4622                                 auth_skipped = 0;
 4623                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
 4624                                     auth_offset)) {
 4625                                         /* auth HMAC failed so dump it */
 4626                                         *offset = length;
 4627                                         if (locked_tcb) {
 4628                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4629                                         }
 4630                                         return (NULL);
 4631                                 } else {
 4632                                         /* remaining chunks are HMAC checked */
 4633                                         stcb->asoc.authenticated = 1;
 4634                                 }
 4635                         }
 4636                 }
 4637                 if (stcb == NULL) {
 4638                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 4639                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 4640                             msg);
 4641                         /* no association, so it's out of the blue... */
 4642                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
 4643                             mflowtype, mflowid, inp->fibnum,
 4644                             vrf_id, port);
 4645                         *offset = length;
 4646                         if (locked_tcb) {
 4647                                 SCTP_TCB_UNLOCK(locked_tcb);
 4648                         }
 4649                         return (NULL);
 4650                 }
 4651                 asoc = &stcb->asoc;
 4652                 /* ABORT and SHUTDOWN can use either v_tag... */
 4653                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
 4654                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
 4655                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
 4656                         /* Take the T-bit always into account. */
 4657                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
 4658                             (vtag_in == asoc->my_vtag)) ||
 4659                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
 4660                             (vtag_in == asoc->peer_vtag))) {
 4661                                 /* this is valid */
 4662                         } else {
 4663                                 /* drop this packet... */
 4664                                 SCTP_STAT_INCR(sctps_badvtag);
 4665                                 if (locked_tcb) {
 4666                                         SCTP_TCB_UNLOCK(locked_tcb);
 4667                                 }
 4668                                 return (NULL);
 4669                         }
 4670                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 4671                         if (vtag_in != asoc->my_vtag) {
 4672                                 /*
 4673                                  * this could be a stale SHUTDOWN-ACK or the
 4674                                  * peer never got the SHUTDOWN-COMPLETE and
 4675                                  * is still hung; we have started a new asoc
 4676                                  * but it won't complete until the shutdown
 4677                                  * is completed
 4678                                  */
 4679                                 if (locked_tcb) {
 4680                                         SCTP_TCB_UNLOCK(locked_tcb);
 4681                                 }
 4682                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 4683                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 4684                                     msg);
 4685                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
 4686                                     sh, inp, op_err,
 4687                                     mflowtype, mflowid, fibnum,
 4688                                     vrf_id, port);
 4689                                 return (NULL);
 4690                         }
 4691                 } else {
 4692                         /* for all other chunks, vtag must match */
 4693                         if (vtag_in != asoc->my_vtag) {
 4694                                 /* invalid vtag... */
 4695                                 SCTPDBG(SCTP_DEBUG_INPUT3,
 4696                                     "invalid vtag: %xh, expect %xh\n",
 4697                                     vtag_in, asoc->my_vtag);
 4698                                 SCTP_STAT_INCR(sctps_badvtag);
 4699                                 if (locked_tcb) {
 4700                                         SCTP_TCB_UNLOCK(locked_tcb);
 4701                                 }
 4702                                 *offset = length;
 4703                                 return (NULL);
 4704                         }
 4705                 }
 4706         }                       /* end if !SCTP_COOKIE_ECHO */
 4707         /*
 4708          * process all control chunks...
 4709          */
 4710         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
 4711             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
 4712             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
 4713             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 4714                 /* implied cookie-ack.. we must have lost the ack */
 4715                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4716                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4717                             stcb->asoc.overall_error_count,
 4718                             0,
 4719                             SCTP_FROM_SCTP_INPUT,
 4720                             __LINE__);
 4721                 }
 4722                 stcb->asoc.overall_error_count = 0;
 4723                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
 4724                     *netp);
 4725         }
 4726 process_control_chunks:
 4727         while (IS_SCTP_CONTROL(ch)) {
 4728                 /* validate chunk length */
 4729                 chk_length = ntohs(ch->chunk_length);
 4730                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
 4731                     ch->chunk_type, chk_length);
 4732                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
 4733                 if (chk_length < sizeof(*ch) ||
 4734                     (*offset + (int)chk_length) > length) {
 4735                         *offset = length;
 4736                         if (locked_tcb) {
 4737                                 SCTP_TCB_UNLOCK(locked_tcb);
 4738                         }
 4739                         return (NULL);
 4740                 }
 4741                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
 4742                 /*
 4743                  * INIT-ACK only gets the init ack "header" portion only
 4744                  * because we don't have to process the peer's COOKIE. All
 4745                  * others get a complete chunk.
 4746                  */
 4747                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
 4748                     (ch->chunk_type == SCTP_INITIATION)) {
 4749                         /* get an init-ack chunk */
 4750                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4751                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
 4752                         if (ch == NULL) {
 4753                                 *offset = length;
 4754                                 if (locked_tcb) {
 4755                                         SCTP_TCB_UNLOCK(locked_tcb);
 4756                                 }
 4757                                 return (NULL);
 4758                         }
 4759                 } else {
 4760                         /* For cookies and all other chunks. */
 4761                         if (chk_length > sizeof(chunk_buf)) {
 4762                                 /*
 4763                                  * use just the size of the chunk buffer so
 4764                                  * the front part of our chunks fit in
 4765                                  * contiguous space up to the chunk buffer
 4766                                  * size (508 bytes). For chunks that need to
 4767                                  * get more than that they must use the
 4768                                  * sctp_m_getptr() function or other means
 4769                                  * (e.g. know how to parse mbuf chains).
 4770                                  * Cookies do this already.
 4771                                  */
 4772                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4773                                     (sizeof(chunk_buf) - 4),
 4774                                     chunk_buf);
 4775                                 if (ch == NULL) {
 4776                                         *offset = length;
 4777                                         if (locked_tcb) {
 4778                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4779                                         }
 4780                                         return (NULL);
 4781                                 }
 4782                         } else {
 4783                                 /* We can fit it all */
 4784                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4785                                     chk_length, chunk_buf);
 4786                                 if (ch == NULL) {
 4787                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
 4788                                         *offset = length;
 4789                                         if (locked_tcb) {
 4790                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4791                                         }
 4792                                         return (NULL);
 4793                                 }
 4794                         }
 4795                 }
 4796                 num_chunks++;
 4797                 /* Save off the last place we got a control from */
 4798                 if (stcb != NULL) {
 4799                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
 4800                                 /*
 4801                                  * allow last_control to be NULL if
 4802                                  * ASCONF... ASCONF processing will find the
 4803                                  * right net later
 4804                                  */
 4805                                 if ((netp != NULL) && (*netp != NULL))
 4806                                         stcb->asoc.last_control_chunk_from = *netp;
 4807                         }
 4808                 }
 4809 #ifdef SCTP_AUDITING_ENABLED
 4810                 sctp_audit_log(0xB0, ch->chunk_type);
 4811 #endif
 4812 
 4813                 /* check to see if this chunk required auth, but isn't */
 4814                 if ((stcb != NULL) &&
 4815                     (stcb->asoc.auth_supported == 1) &&
 4816                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
 4817                     !stcb->asoc.authenticated) {
 4818                         /* "silently" ignore */
 4819                         SCTP_STAT_INCR(sctps_recvauthmissing);
 4820                         goto next_chunk;
 4821                 }
 4822                 switch (ch->chunk_type) {
 4823                 case SCTP_INITIATION:
 4824                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
 4825                         /* The INIT chunk must be the only chunk. */
 4826                         if ((num_chunks > 1) ||
 4827                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 4828                                 /* RFC 4960 requires that no ABORT is sent */
 4829                                 *offset = length;
 4830                                 if (locked_tcb) {
 4831                                         SCTP_TCB_UNLOCK(locked_tcb);
 4832                                 }
 4833                                 return (NULL);
 4834                         }
 4835                         /* Honor our resource limit. */
 4836                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
 4837                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 4838                                 sctp_abort_association(inp, stcb, m, iphlen,
 4839                                     src, dst, sh, op_err,
 4840                                     mflowtype, mflowid,
 4841                                     vrf_id, port);
 4842                                 *offset = length;
 4843                                 return (NULL);
 4844                         }
 4845                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
 4846                             (struct sctp_init_chunk *)ch, inp,
 4847                             stcb, *netp, &abort_no_unlock,
 4848                             mflowtype, mflowid,
 4849                             vrf_id, port);
 4850                         *offset = length;
 4851                         if ((!abort_no_unlock) && (locked_tcb)) {
 4852                                 SCTP_TCB_UNLOCK(locked_tcb);
 4853                         }
 4854                         return (NULL);
 4855                         break;
 4856                 case SCTP_PAD_CHUNK:
 4857                         break;
 4858                 case SCTP_INITIATION_ACK:
 4859                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
 4860                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4861                                 /* We are not interested anymore */
 4862                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 4863                                         ;
 4864                                 } else {
 4865                                         if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
 4866                                                 /* Very unlikely */
 4867                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4868                                         }
 4869                                         *offset = length;
 4870                                         if (stcb) {
 4871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4872                                                 so = SCTP_INP_SO(inp);
 4873                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4874                                                 SCTP_TCB_UNLOCK(stcb);
 4875                                                 SCTP_SOCKET_LOCK(so, 1);
 4876                                                 SCTP_TCB_LOCK(stcb);
 4877                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4878 #endif
 4879                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 4880                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
 4881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4882                                                 SCTP_SOCKET_UNLOCK(so, 1);
 4883 #endif
 4884                                         }
 4885                                         return (NULL);
 4886                                 }
 4887                         }
 4888                         /* The INIT-ACK chunk must be the only chunk. */
 4889                         if ((num_chunks > 1) ||
 4890                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 4891                                 *offset = length;
 4892                                 if (locked_tcb) {
 4893                                         SCTP_TCB_UNLOCK(locked_tcb);
 4894                                 }
 4895                                 return (NULL);
 4896                         }
 4897                         if ((netp) && (*netp)) {
 4898                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
 4899                                     src, dst, sh,
 4900                                     (struct sctp_init_ack_chunk *)ch,
 4901                                     stcb, *netp,
 4902                                     &abort_no_unlock,
 4903                                     mflowtype, mflowid,
 4904                                     vrf_id);
 4905                         } else {
 4906                                 ret = -1;
 4907                         }
 4908                         *offset = length;
 4909                         if (abort_no_unlock) {
 4910                                 return (NULL);
 4911                         }
 4912                         /*
 4913                          * Special case, I must call the output routine to
 4914                          * get the cookie echoed
 4915                          */
 4916                         if ((stcb != NULL) && (ret == 0)) {
 4917                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 4918                         }
 4919                         if (locked_tcb) {
 4920                                 SCTP_TCB_UNLOCK(locked_tcb);
 4921                         }
 4922                         return (NULL);
 4923                         break;
 4924                 case SCTP_SELECTIVE_ACK:
 4925                         {
 4926                                 struct sctp_sack_chunk *sack;
 4927                                 int abort_now = 0;
 4928                                 uint32_t a_rwnd, cum_ack;
 4929                                 uint16_t num_seg, num_dup;
 4930                                 uint8_t flags;
 4931                                 int offset_seg, offset_dup;
 4932 
 4933                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
 4934                                 SCTP_STAT_INCR(sctps_recvsacks);
 4935                                 if (stcb == NULL) {
 4936                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
 4937                                         break;
 4938                                 }
 4939                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
 4940                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
 4941                                         break;
 4942                                 }
 4943                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 4944                                         /*-
 4945                                          * If we have sent a shutdown-ack, we will pay no
 4946                                          * attention to a sack sent in to us since
 4947                                          * we don't care anymore.
 4948                                          */
 4949                                         break;
 4950                                 }
 4951                                 sack = (struct sctp_sack_chunk *)ch;
 4952                                 flags = ch->chunk_flags;
 4953                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
 4954                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
 4955                                 num_dup = ntohs(sack->sack.num_dup_tsns);
 4956                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
 4957                                 if (sizeof(struct sctp_sack_chunk) +
 4958                                     num_seg * sizeof(struct sctp_gap_ack_block) +
 4959                                     num_dup * sizeof(uint32_t) != chk_length) {
 4960                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
 4961                                         break;
 4962                                 }
 4963                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
 4964                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
 4965                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
 4966                                     cum_ack, num_seg, a_rwnd);
 4967                                 stcb->asoc.seen_a_sack_this_pkt = 1;
 4968                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
 4969                                     (num_seg == 0) &&
 4970                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
 4971                                     (stcb->asoc.saw_sack_with_frags == 0) &&
 4972                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
 4973                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
 4974                                     ) {
 4975                                         /*
 4976                                          * We have a SIMPLE sack having no
 4977                                          * prior segments and data on sent
 4978                                          * queue to be acked.. Use the
 4979                                          * faster path sack processing. We
 4980                                          * also allow window update sacks
 4981                                          * with no missing segments to go
 4982                                          * this way too.
 4983                                          */
 4984                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
 4985                                 } else {
 4986                                         if (netp && *netp)
 4987                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
 4988                                                     num_seg, 0, num_dup, &abort_now, flags,
 4989                                                     cum_ack, a_rwnd, ecne_seen);
 4990                                 }
 4991                                 if (abort_now) {
 4992                                         /* ABORT signal from sack processing */
 4993                                         *offset = length;
 4994                                         return (NULL);
 4995                                 }
 4996                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
 4997                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
 4998                                     (stcb->asoc.stream_queue_cnt == 0)) {
 4999                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 5000                                 }
 5001                         }
 5002                         break;
 5003                         /*
 5004                          * EY - nr_sack:  If the received chunk is an
 5005                          * nr_sack chunk
 5006                          */
 5007                 case SCTP_NR_SELECTIVE_ACK:
 5008                         {
 5009                                 struct sctp_nr_sack_chunk *nr_sack;
 5010                                 int abort_now = 0;
 5011                                 uint32_t a_rwnd, cum_ack;
 5012                                 uint16_t num_seg, num_nr_seg, num_dup;
 5013                                 uint8_t flags;
 5014                                 int offset_seg, offset_dup;
 5015 
 5016                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
 5017                                 SCTP_STAT_INCR(sctps_recvsacks);
 5018                                 if (stcb == NULL) {
 5019                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
 5020                                         break;
 5021                                 }
 5022                                 if (stcb->asoc.nrsack_supported == 0) {
 5023                                         goto unknown_chunk;
 5024                                 }
 5025                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
 5026                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
 5027                                         break;
 5028                                 }
 5029                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 5030                                         /*-
 5031                                          * If we have sent a shutdown-ack, we will pay no
 5032                                          * attention to a sack sent in to us since
 5033                                          * we don't care anymore.
 5034                                          */
 5035                                         break;
 5036                                 }
 5037                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
 5038                                 flags = ch->chunk_flags;
 5039                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
 5040                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
 5041                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
 5042                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
 5043                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
 5044                                 if (sizeof(struct sctp_nr_sack_chunk) +
 5045                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
 5046                                     num_dup * sizeof(uint32_t) != chk_length) {
 5047                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
 5048                                         break;
 5049                                 }
 5050                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
 5051                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
 5052                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
 5053                                     cum_ack, num_seg, a_rwnd);
 5054                                 stcb->asoc.seen_a_sack_this_pkt = 1;
 5055                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
 5056                                     (num_seg == 0) && (num_nr_seg == 0) &&
 5057                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
 5058                                     (stcb->asoc.saw_sack_with_frags == 0) &&
 5059                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
 5060                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 5061                                         /*
 5062                                          * We have a SIMPLE sack having no
 5063                                          * prior segments and data on sent
 5064                                          * queue to be acked. Use the faster
 5065                                          * path sack processing. We also
 5066                                          * allow window update sacks with no
 5067                                          * missing segments to go this way
 5068                                          * too.
 5069                                          */
 5070                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
 5071                                             &abort_now, ecne_seen);
 5072                                 } else {
 5073                                         if (netp && *netp)
 5074                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
 5075                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
 5076                                                     cum_ack, a_rwnd, ecne_seen);
 5077                                 }
 5078                                 if (abort_now) {
 5079                                         /* ABORT signal from sack processing */
 5080                                         *offset = length;
 5081                                         return (NULL);
 5082                                 }
 5083                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
 5084                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
 5085                                     (stcb->asoc.stream_queue_cnt == 0)) {
 5086                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 5087                                 }
 5088                         }
 5089                         break;
 5090 
 5091                 case SCTP_HEARTBEAT_REQUEST:
 5092                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
 5093                         if ((stcb) && netp && *netp) {
 5094                                 SCTP_STAT_INCR(sctps_recvheartbeat);
 5095                                 sctp_send_heartbeat_ack(stcb, m, *offset,
 5096                                     chk_length, *netp);
 5097 
 5098                                 /* He's alive so give him credit */
 5099                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5100                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5101                                             stcb->asoc.overall_error_count,
 5102                                             0,
 5103                                             SCTP_FROM_SCTP_INPUT,
 5104                                             __LINE__);
 5105                                 }
 5106                                 stcb->asoc.overall_error_count = 0;
 5107                         }
 5108                         break;
 5109                 case SCTP_HEARTBEAT_ACK:
 5110                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
 5111                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
 5112                                 /* Its not ours */
 5113                                 *offset = length;
 5114                                 if (locked_tcb) {
 5115                                         SCTP_TCB_UNLOCK(locked_tcb);
 5116                                 }
 5117                                 return (NULL);
 5118                         }
 5119                         /* He's alive so give him credit */
 5120                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5121                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5122                                     stcb->asoc.overall_error_count,
 5123                                     0,
 5124                                     SCTP_FROM_SCTP_INPUT,
 5125                                     __LINE__);
 5126                         }
 5127                         stcb->asoc.overall_error_count = 0;
 5128                         SCTP_STAT_INCR(sctps_recvheartbeatack);
 5129                         if (netp && *netp)
 5130                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
 5131                                     stcb, *netp);
 5132                         break;
 5133                 case SCTP_ABORT_ASSOCIATION:
 5134                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
 5135                             (void *)stcb);
 5136                         if ((stcb) && netp && *netp)
 5137                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
 5138                                     stcb, *netp);
 5139                         *offset = length;
 5140                         return (NULL);
 5141                         break;
 5142                 case SCTP_SHUTDOWN:
 5143                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
 5144                             (void *)stcb);
 5145                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
 5146                                 *offset = length;
 5147                                 if (locked_tcb) {
 5148                                         SCTP_TCB_UNLOCK(locked_tcb);
 5149                                 }
 5150                                 return (NULL);
 5151                         }
 5152                         if (netp && *netp) {
 5153                                 int abort_flag = 0;
 5154 
 5155                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
 5156                                     stcb, *netp, &abort_flag);
 5157                                 if (abort_flag) {
 5158                                         *offset = length;
 5159                                         return (NULL);
 5160                                 }
 5161                         }
 5162                         break;
 5163                 case SCTP_SHUTDOWN_ACK:
 5164                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
 5165                         if ((stcb) && (netp) && (*netp))
 5166                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
 5167                         *offset = length;
 5168                         return (NULL);
 5169                         break;
 5170 
 5171                 case SCTP_OPERATION_ERROR:
 5172                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
 5173                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
 5174                                 *offset = length;
 5175                                 return (NULL);
 5176                         }
 5177                         break;
 5178                 case SCTP_COOKIE_ECHO:
 5179                         SCTPDBG(SCTP_DEBUG_INPUT3,
 5180                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
 5181                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 5182                                 ;
 5183                         } else {
 5184                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5185                                         /* We are not interested anymore */
 5186                         abend:
 5187                                         if (stcb) {
 5188                                                 SCTP_TCB_UNLOCK(stcb);
 5189                                         }
 5190                                         *offset = length;
 5191                                         return (NULL);
 5192                                 }
 5193                         }
 5194                         /*
 5195                          * First are we accepting? We do this again here
 5196                          * since it is possible that a previous endpoint WAS
 5197                          * listening responded to a INIT-ACK and then
 5198                          * closed. We opened and bound.. and are now no
 5199                          * longer listening.
 5200                          */
 5201 
 5202                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
 5203                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 5204                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
 5205                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 5206                                         sctp_abort_association(inp, stcb, m, iphlen,
 5207                                             src, dst, sh, op_err,
 5208                                             mflowtype, mflowid,
 5209                                             vrf_id, port);
 5210                                 }
 5211                                 *offset = length;
 5212                                 return (NULL);
 5213                         } else {
 5214                                 struct mbuf *ret_buf;
 5215                                 struct sctp_inpcb *linp;
 5216 
 5217                                 if (stcb) {
 5218                                         linp = NULL;
 5219                                 } else {
 5220                                         linp = inp;
 5221                                 }
 5222 
 5223                                 if (linp) {
 5224                                         SCTP_ASOC_CREATE_LOCK(linp);
 5225                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 5226                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
 5227                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
 5228                                                 goto abend;
 5229                                         }
 5230                                 }
 5231                                 if (netp) {
 5232                                         ret_buf =
 5233                                             sctp_handle_cookie_echo(m, iphlen,
 5234                                             *offset,
 5235                                             src, dst,
 5236                                             sh,
 5237                                             (struct sctp_cookie_echo_chunk *)ch,
 5238                                             &inp, &stcb, netp,
 5239                                             auth_skipped,
 5240                                             auth_offset,
 5241                                             auth_len,
 5242                                             &locked_tcb,
 5243                                             mflowtype,
 5244                                             mflowid,
 5245                                             vrf_id,
 5246                                             port);
 5247                                 } else {
 5248                                         ret_buf = NULL;
 5249                                 }
 5250                                 if (linp) {
 5251                                         SCTP_ASOC_CREATE_UNLOCK(linp);
 5252                                 }
 5253                                 if (ret_buf == NULL) {
 5254                                         if (locked_tcb) {
 5255                                                 SCTP_TCB_UNLOCK(locked_tcb);
 5256                                         }
 5257                                         SCTPDBG(SCTP_DEBUG_INPUT3,
 5258                                             "GAK, null buffer\n");
 5259                                         *offset = length;
 5260                                         return (NULL);
 5261                                 }
 5262                                 /* if AUTH skipped, see if it verified... */
 5263                                 if (auth_skipped) {
 5264                                         got_auth = 1;
 5265                                         auth_skipped = 0;
 5266                                 }
 5267                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
 5268                                         /*
 5269                                          * Restart the timer if we have
 5270                                          * pending data
 5271                                          */
 5272                                         struct sctp_tmit_chunk *chk;
 5273 
 5274                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
 5275                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
 5276                                 }
 5277                         }
 5278                         break;
 5279                 case SCTP_COOKIE_ACK:
 5280                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
 5281                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
 5282                                 if (locked_tcb) {
 5283                                         SCTP_TCB_UNLOCK(locked_tcb);
 5284                                 }
 5285                                 return (NULL);
 5286                         }
 5287                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5288                                 /* We are not interested anymore */
 5289                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 5290                                         ;
 5291                                 } else if (stcb) {
 5292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5293                                         so = SCTP_INP_SO(inp);
 5294                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5295                                         SCTP_TCB_UNLOCK(stcb);
 5296                                         SCTP_SOCKET_LOCK(so, 1);
 5297                                         SCTP_TCB_LOCK(stcb);
 5298                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 5299 #endif
 5300                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 5301                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
 5302 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5303                                         SCTP_SOCKET_UNLOCK(so, 1);
 5304 #endif
 5305                                         *offset = length;
 5306                                         return (NULL);
 5307                                 }
 5308                         }
 5309                         /* He's alive so give him credit */
 5310                         if ((stcb) && netp && *netp) {
 5311                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5312                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5313                                             stcb->asoc.overall_error_count,
 5314                                             0,
 5315                                             SCTP_FROM_SCTP_INPUT,
 5316                                             __LINE__);
 5317                                 }
 5318                                 stcb->asoc.overall_error_count = 0;
 5319                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
 5320                         }
 5321                         break;
 5322                 case SCTP_ECN_ECHO:
 5323                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
 5324                         /* He's alive so give him credit */
 5325                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
 5326                                 /* Its not ours */
 5327                                 if (locked_tcb) {
 5328                                         SCTP_TCB_UNLOCK(locked_tcb);
 5329                                 }
 5330                                 *offset = length;
 5331                                 return (NULL);
 5332                         }
 5333                         if (stcb) {
 5334                                 if (stcb->asoc.ecn_supported == 0) {
 5335                                         goto unknown_chunk;
 5336                                 }
 5337                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5338                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5339                                             stcb->asoc.overall_error_count,
 5340                                             0,
 5341                                             SCTP_FROM_SCTP_INPUT,
 5342                                             __LINE__);
 5343                                 }
 5344                                 stcb->asoc.overall_error_count = 0;
 5345                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
 5346                                     stcb);
 5347                                 ecne_seen = 1;
 5348                         }
 5349                         break;
 5350                 case SCTP_ECN_CWR:
 5351                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
 5352                         /* He's alive so give him credit */
 5353                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
 5354                                 /* Its not ours */
 5355                                 if (locked_tcb) {
 5356                                         SCTP_TCB_UNLOCK(locked_tcb);
 5357                                 }
 5358                                 *offset = length;
 5359                                 return (NULL);
 5360                         }
 5361                         if (stcb) {
 5362                                 if (stcb->asoc.ecn_supported == 0) {
 5363                                         goto unknown_chunk;
 5364                                 }
 5365                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5366                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5367                                             stcb->asoc.overall_error_count,
 5368                                             0,
 5369                                             SCTP_FROM_SCTP_INPUT,
 5370                                             __LINE__);
 5371                                 }
 5372                                 stcb->asoc.overall_error_count = 0;
 5373                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
 5374                         }
 5375                         break;
 5376                 case SCTP_SHUTDOWN_COMPLETE:
 5377                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
 5378                         /* must be first and only chunk */
 5379                         if ((num_chunks > 1) ||
 5380                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 5381                                 *offset = length;
 5382                                 if (locked_tcb) {
 5383                                         SCTP_TCB_UNLOCK(locked_tcb);
 5384                                 }
 5385                                 return (NULL);
 5386                         }
 5387                         if ((stcb) && netp && *netp) {
 5388                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
 5389                                     stcb, *netp);
 5390                         }
 5391                         *offset = length;
 5392                         return (NULL);
 5393                         break;
 5394                 case SCTP_ASCONF:
 5395                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
 5396                         /* He's alive so give him credit */
 5397                         if (stcb) {
 5398                                 if (stcb->asoc.asconf_supported == 0) {
 5399                                         goto unknown_chunk;
 5400                                 }
 5401                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5402                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5403                                             stcb->asoc.overall_error_count,
 5404                                             0,
 5405                                             SCTP_FROM_SCTP_INPUT,
 5406                                             __LINE__);
 5407                                 }
 5408                                 stcb->asoc.overall_error_count = 0;
 5409                                 sctp_handle_asconf(m, *offset, src,
 5410                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
 5411                                 asconf_cnt++;
 5412                         }
 5413                         break;
 5414                 case SCTP_ASCONF_ACK:
 5415                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
 5416                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
 5417                                 /* Its not ours */
 5418                                 if (locked_tcb) {
 5419                                         SCTP_TCB_UNLOCK(locked_tcb);
 5420                                 }
 5421                                 *offset = length;
 5422                                 return (NULL);
 5423                         }
 5424                         if ((stcb) && netp && *netp) {
 5425                                 if (stcb->asoc.asconf_supported == 0) {
 5426                                         goto unknown_chunk;
 5427                                 }
 5428                                 /* He's alive so give him credit */
 5429                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5430                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5431                                             stcb->asoc.overall_error_count,
 5432                                             0,
 5433                                             SCTP_FROM_SCTP_INPUT,
 5434                                             __LINE__);
 5435                                 }
 5436                                 stcb->asoc.overall_error_count = 0;
 5437                                 sctp_handle_asconf_ack(m, *offset,
 5438                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
 5439                                 if (abort_no_unlock)
 5440                                         return (NULL);
 5441                         }
 5442                         break;
 5443                 case SCTP_FORWARD_CUM_TSN:
 5444                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
 5445                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
 5446                                 /* Its not ours */
 5447                                 if (locked_tcb) {
 5448                                         SCTP_TCB_UNLOCK(locked_tcb);
 5449                                 }
 5450                                 *offset = length;
 5451                                 return (NULL);
 5452                         }
 5453                         /* He's alive so give him credit */
 5454                         if (stcb) {
 5455                                 int abort_flag = 0;
 5456 
 5457                                 if (stcb->asoc.prsctp_supported == 0) {
 5458                                         goto unknown_chunk;
 5459                                 }
 5460                                 stcb->asoc.overall_error_count = 0;
 5461                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5462                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5463                                             stcb->asoc.overall_error_count,
 5464                                             0,
 5465                                             SCTP_FROM_SCTP_INPUT,
 5466                                             __LINE__);
 5467                                 }
 5468                                 *fwd_tsn_seen = 1;
 5469                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5470                                         /* We are not interested anymore */
 5471 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5472                                         so = SCTP_INP_SO(inp);
 5473                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5474                                         SCTP_TCB_UNLOCK(stcb);
 5475                                         SCTP_SOCKET_LOCK(so, 1);
 5476                                         SCTP_TCB_LOCK(stcb);
 5477                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 5478 #endif
 5479                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 5480                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
 5481 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5482                                         SCTP_SOCKET_UNLOCK(so, 1);
 5483 #endif
 5484                                         *offset = length;
 5485                                         return (NULL);
 5486                                 }
 5487                                 sctp_handle_forward_tsn(stcb,
 5488                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
 5489                                 if (abort_flag) {
 5490                                         *offset = length;
 5491                                         return (NULL);
 5492                                 } else {
 5493                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5494                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5495                                                     stcb->asoc.overall_error_count,
 5496                                                     0,
 5497                                                     SCTP_FROM_SCTP_INPUT,
 5498                                                     __LINE__);
 5499                                         }
 5500                                         stcb->asoc.overall_error_count = 0;
 5501                                 }
 5502 
 5503                         }
 5504                         break;
 5505                 case SCTP_STREAM_RESET:
 5506                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
 5507                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
 5508                                 /* Its not ours */
 5509                                 if (locked_tcb) {
 5510                                         SCTP_TCB_UNLOCK(locked_tcb);
 5511                                 }
 5512                                 *offset = length;
 5513                                 return (NULL);
 5514                         }
 5515                         if (stcb->asoc.reconfig_supported == 0) {
 5516                                 goto unknown_chunk;
 5517                         }
 5518                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
 5519                                 /* stop processing */
 5520                                 *offset = length;
 5521                                 return (NULL);
 5522                         }
 5523                         break;
 5524                 case SCTP_PACKET_DROPPED:
 5525                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
 5526                         /* re-get it all please */
 5527                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
 5528                                 /* Its not ours */
 5529                                 if (locked_tcb) {
 5530                                         SCTP_TCB_UNLOCK(locked_tcb);
 5531                                 }
 5532                                 *offset = length;
 5533                                 return (NULL);
 5534                         }
 5535                         if (ch && (stcb) && netp && (*netp)) {
 5536                                 if (stcb->asoc.pktdrop_supported == 0) {
 5537                                         goto unknown_chunk;
 5538                                 }
 5539                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
 5540                                     stcb, *netp,
 5541                                     min(chk_length, (sizeof(chunk_buf) - 4)));
 5542 
 5543                         }
 5544                         break;
 5545                 case SCTP_AUTHENTICATION:
 5546                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
 5547                         if (stcb == NULL) {
 5548                                 /* save the first AUTH for later processing */
 5549                                 if (auth_skipped == 0) {
 5550                                         auth_offset = *offset;
 5551                                         auth_len = chk_length;
 5552                                         auth_skipped = 1;
 5553                                 }
 5554                                 /* skip this chunk (temporarily) */
 5555                                 goto next_chunk;
 5556                         }
 5557                         if (stcb->asoc.auth_supported == 0) {
 5558                                 goto unknown_chunk;
 5559                         }
 5560                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
 5561                             (chk_length > (sizeof(struct sctp_auth_chunk) +
 5562                             SCTP_AUTH_DIGEST_LEN_MAX))) {
 5563                                 /* Its not ours */
 5564                                 if (locked_tcb) {
 5565                                         SCTP_TCB_UNLOCK(locked_tcb);
 5566                                 }
 5567                                 *offset = length;
 5568                                 return (NULL);
 5569                         }
 5570                         if (got_auth == 1) {
 5571                                 /* skip this chunk... it's already auth'd */
 5572                                 goto next_chunk;
 5573                         }
 5574                         got_auth = 1;
 5575                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
 5576                             m, *offset)) {
 5577                                 /* auth HMAC failed so dump the packet */
 5578                                 *offset = length;
 5579                                 return (stcb);
 5580                         } else {
 5581                                 /* remaining chunks are HMAC checked */
 5582                                 stcb->asoc.authenticated = 1;
 5583                         }
 5584                         break;
 5585 
 5586                 default:
 5587         unknown_chunk:
 5588                         /* it's an unknown chunk! */
 5589                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
 5590                                 struct sctp_gen_error_cause *cause;
 5591                                 int len;
 5592 
 5593                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
 5594                                     0, M_NOWAIT, 1, MT_DATA);
 5595                                 if (op_err != NULL) {
 5596                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
 5597                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
 5598                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
 5599                                         cause->length = htons(len + sizeof(struct sctp_gen_error_cause));
 5600                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
 5601                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
 5602                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
 5603 #ifdef SCTP_MBUF_LOGGING
 5604                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 5605                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
 5606                                                 }
 5607 #endif
 5608                                                 sctp_queue_op_err(stcb, op_err);
 5609                                         } else {
 5610                                                 sctp_m_freem(op_err);
 5611                                         }
 5612                                 }
 5613                         }
 5614                         if ((ch->chunk_type & 0x80) == 0) {
 5615                                 /* discard this packet */
 5616                                 *offset = length;
 5617                                 return (stcb);
 5618                         }       /* else skip this bad chunk and continue... */
 5619                         break;
 5620                 }               /* switch (ch->chunk_type) */
 5621 
 5622 
 5623 next_chunk:
 5624                 /* get the next chunk */
 5625                 *offset += SCTP_SIZE32(chk_length);
 5626                 if (*offset >= length) {
 5627                         /* no more data left in the mbuf chain */
 5628                         break;
 5629                 }
 5630                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 5631                     sizeof(struct sctp_chunkhdr), chunk_buf);
 5632                 if (ch == NULL) {
 5633                         if (locked_tcb) {
 5634                                 SCTP_TCB_UNLOCK(locked_tcb);
 5635                         }
 5636                         *offset = length;
 5637                         return (NULL);
 5638                 }
 5639         }                       /* while */
 5640 
 5641         if (asconf_cnt > 0 && stcb != NULL) {
 5642                 sctp_send_asconf_ack(stcb);
 5643         }
 5644         return (stcb);
 5645 }
 5646 
 5647 
 5648 /*
 5649  * common input chunk processing (v4 and v6)
 5650  */
 5651 void
 5652 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
 5653     struct sockaddr *src, struct sockaddr *dst,
 5654     struct sctphdr *sh, struct sctp_chunkhdr *ch,
 5655 #if !defined(SCTP_WITH_NO_CSUM)
 5656     uint8_t compute_crc,
 5657 #endif
 5658     uint8_t ecn_bits,
 5659     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
 5660     uint32_t vrf_id, uint16_t port)
 5661 {
 5662         uint32_t high_tsn;
 5663         int fwd_tsn_seen = 0, data_processed = 0;
 5664         struct mbuf *m = *mm, *op_err;
 5665         char msg[SCTP_DIAG_INFO_LEN];
 5666         int un_sent;
 5667         int cnt_ctrl_ready = 0;
 5668         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
 5669         struct sctp_tcb *stcb = NULL;
 5670         struct sctp_nets *net = NULL;
 5671 
 5672         SCTP_STAT_INCR(sctps_recvdatagrams);
 5673 #ifdef SCTP_AUDITING_ENABLED
 5674         sctp_audit_log(0xE0, 1);
 5675         sctp_auditing(0, inp, stcb, net);
 5676 #endif
 5677 #if !defined(SCTP_WITH_NO_CSUM)
 5678         if (compute_crc != 0) {
 5679                 uint32_t check, calc_check;
 5680 
 5681                 check = sh->checksum;
 5682                 sh->checksum = 0;
 5683                 calc_check = sctp_calculate_cksum(m, iphlen);
 5684                 sh->checksum = check;
 5685                 if (calc_check != check) {
 5686                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
 5687                             calc_check, check, (void *)m, length, iphlen);
 5688                         stcb = sctp_findassociation_addr(m, offset, src, dst,
 5689                             sh, ch, &inp, &net, vrf_id);
 5690 #if defined(INET) || defined(INET6)
 5691                         if ((ch->chunk_type != SCTP_INITIATION) &&
 5692                             (net != NULL) && (net->port != port)) {
 5693                                 if (net->port == 0) {
 5694                                         /* UDP encapsulation turned on. */
 5695                                         net->mtu -= sizeof(struct udphdr);
 5696                                         if (stcb->asoc.smallest_mtu > net->mtu) {
 5697                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
 5698                                         }
 5699                                 } else if (port == 0) {
 5700                                         /* UDP encapsulation turned off. */
 5701                                         net->mtu += sizeof(struct udphdr);
 5702                                         /* XXX Update smallest_mtu */
 5703                                 }
 5704                                 net->port = port;
 5705                         }
 5706 #endif
 5707                         if (net != NULL) {
 5708                                 net->flowtype = mflowtype;
 5709                                 net->flowid = mflowid;
 5710                         }
 5711                         if ((inp != NULL) && (stcb != NULL)) {
 5712                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
 5713                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 5714                         } else if ((inp != NULL) && (stcb == NULL)) {
 5715                                 inp_decr = inp;
 5716                         }
 5717                         SCTP_STAT_INCR(sctps_badsum);
 5718                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 5719                         goto out;
 5720                 }
 5721         }
 5722 #endif
 5723         /* Destination port of 0 is illegal, based on RFC4960. */
 5724         if (sh->dest_port == 0) {
 5725                 SCTP_STAT_INCR(sctps_hdrops);
 5726                 goto out;
 5727         }
 5728         stcb = sctp_findassociation_addr(m, offset, src, dst,
 5729             sh, ch, &inp, &net, vrf_id);
 5730 #if defined(INET) || defined(INET6)
 5731         if ((ch->chunk_type != SCTP_INITIATION) &&
 5732             (net != NULL) && (net->port != port)) {
 5733                 if (net->port == 0) {
 5734                         /* UDP encapsulation turned on. */
 5735                         net->mtu -= sizeof(struct udphdr);
 5736                         if (stcb->asoc.smallest_mtu > net->mtu) {
 5737                                 sctp_pathmtu_adjustment(stcb, net->mtu);
 5738                         }
 5739                 } else if (port == 0) {
 5740                         /* UDP encapsulation turned off. */
 5741                         net->mtu += sizeof(struct udphdr);
 5742                         /* XXX Update smallest_mtu */
 5743                 }
 5744                 net->port = port;
 5745         }
 5746 #endif
 5747         if (net != NULL) {
 5748                 net->flowtype = mflowtype;
 5749                 net->flowid = mflowid;
 5750         }
 5751         if (inp == NULL) {
 5752                 SCTP_STAT_INCR(sctps_noport);
 5753                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
 5754                         goto out;
 5755                 }
 5756                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 5757                         sctp_send_shutdown_complete2(src, dst, sh,
 5758                             mflowtype, mflowid, fibnum,
 5759                             vrf_id, port);
 5760                         goto out;
 5761                 }
 5762                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 5763                         goto out;
 5764                 }
 5765                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
 5766                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
 5767                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
 5768                             (ch->chunk_type != SCTP_INIT))) {
 5769                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5770                                     "Out of the blue");
 5771                                 sctp_send_abort(m, iphlen, src, dst,
 5772                                     sh, 0, op_err,
 5773                                     mflowtype, mflowid, fibnum,
 5774                                     vrf_id, port);
 5775                         }
 5776                 }
 5777                 goto out;
 5778         } else if (stcb == NULL) {
 5779                 inp_decr = inp;
 5780         }
 5781 #ifdef IPSEC
 5782         /*-
 5783          * I very much doubt any of the IPSEC stuff will work but I have no
 5784          * idea, so I will leave it in place.
 5785          */
 5786         if (inp != NULL) {
 5787                 switch (dst->sa_family) {
 5788 #ifdef INET
 5789                 case AF_INET:
 5790                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
 5791                                 IPSECSTAT_INC(ips_in_polvio);
 5792                                 SCTP_STAT_INCR(sctps_hdrops);
 5793                                 goto out;
 5794                         }
 5795                         break;
 5796 #endif
 5797 #ifdef INET6
 5798                 case AF_INET6:
 5799                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
 5800                                 IPSEC6STAT_INC(ips_in_polvio);
 5801                                 SCTP_STAT_INCR(sctps_hdrops);
 5802                                 goto out;
 5803                         }
 5804                         break;
 5805 #endif
 5806                 default:
 5807                         break;
 5808                 }
 5809         }
 5810 #endif
 5811         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
 5812             (void *)m, iphlen, offset, length, (void *)stcb);
 5813         if (stcb) {
 5814                 /* always clear this before beginning a packet */
 5815                 stcb->asoc.authenticated = 0;
 5816                 stcb->asoc.seen_a_sack_this_pkt = 0;
 5817                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
 5818                     (void *)stcb, stcb->asoc.state);
 5819 
 5820                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
 5821                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
 5822                         /*-
 5823                          * If we hit here, we had a ref count
 5824                          * up when the assoc was aborted and the
 5825                          * timer is clearing out the assoc, we should
 5826                          * NOT respond to any packet.. its OOTB.
 5827                          */
 5828                         SCTP_TCB_UNLOCK(stcb);
 5829                         stcb = NULL;
 5830                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 5831                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5832                             msg);
 5833                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
 5834                             mflowtype, mflowid, inp->fibnum,
 5835                             vrf_id, port);
 5836                         goto out;
 5837                 }
 5838         }
 5839         if (IS_SCTP_CONTROL(ch)) {
 5840                 /* process the control portion of the SCTP packet */
 5841                 /* sa_ignore NO_NULL_CHK */
 5842                 stcb = sctp_process_control(m, iphlen, &offset, length,
 5843                     src, dst, sh, ch,
 5844                     inp, stcb, &net, &fwd_tsn_seen,
 5845                     mflowtype, mflowid, fibnum,
 5846                     vrf_id, port);
 5847                 if (stcb) {
 5848                         /*
 5849                          * This covers us if the cookie-echo was there and
 5850                          * it changes our INP.
 5851                          */
 5852                         inp = stcb->sctp_ep;
 5853 #if defined(INET) || defined(INET6)
 5854                         if ((ch->chunk_type != SCTP_INITIATION) &&
 5855                             (net != NULL) && (net->port != port)) {
 5856                                 if (net->port == 0) {
 5857                                         /* UDP encapsulation turned on. */
 5858                                         net->mtu -= sizeof(struct udphdr);
 5859                                         if (stcb->asoc.smallest_mtu > net->mtu) {
 5860                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
 5861                                         }
 5862                                 } else if (port == 0) {
 5863                                         /* UDP encapsulation turned off. */
 5864                                         net->mtu += sizeof(struct udphdr);
 5865                                         /* XXX Update smallest_mtu */
 5866                                 }
 5867                                 net->port = port;
 5868                         }
 5869 #endif
 5870                 }
 5871         } else {
 5872                 /*
 5873                  * no control chunks, so pre-process DATA chunks (these
 5874                  * checks are taken care of by control processing)
 5875                  */
 5876 
 5877                 /*
 5878                  * if DATA only packet, and auth is required, then punt...
 5879                  * can't have authenticated without any AUTH (control)
 5880                  * chunks
 5881                  */
 5882                 if ((stcb != NULL) &&
 5883                     (stcb->asoc.auth_supported == 1) &&
 5884                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
 5885                         /* "silently" ignore */
 5886                         SCTP_STAT_INCR(sctps_recvauthmissing);
 5887                         goto out;
 5888                 }
 5889                 if (stcb == NULL) {
 5890                         /* out of the blue DATA chunk */
 5891                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 5892                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5893                             msg);
 5894                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
 5895                             mflowtype, mflowid, fibnum,
 5896                             vrf_id, port);
 5897                         goto out;
 5898                 }
 5899                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
 5900                         /* v_tag mismatch! */
 5901                         SCTP_STAT_INCR(sctps_badvtag);
 5902                         goto out;
 5903                 }
 5904         }
 5905 
 5906         if (stcb == NULL) {
 5907                 /*
 5908                  * no valid TCB for this packet, or we found it's a bad
 5909                  * packet while processing control, or we're done with this
 5910                  * packet (done or skip rest of data), so we drop it...
 5911                  */
 5912                 goto out;
 5913         }
 5914         /*
 5915          * DATA chunk processing
 5916          */
 5917         /* plow through the data chunks while length > offset */
 5918 
 5919         /*
 5920          * Rest should be DATA only.  Check authentication state if AUTH for
 5921          * DATA is required.
 5922          */
 5923         if ((length > offset) &&
 5924             (stcb != NULL) &&
 5925             (stcb->asoc.auth_supported == 1) &&
 5926             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
 5927             !stcb->asoc.authenticated) {
 5928                 /* "silently" ignore */
 5929                 SCTP_STAT_INCR(sctps_recvauthmissing);
 5930                 SCTPDBG(SCTP_DEBUG_AUTH1,
 5931                     "Data chunk requires AUTH, skipped\n");
 5932                 goto trigger_send;
 5933         }
 5934         if (length > offset) {
 5935                 int retval;
 5936 
 5937                 /*
 5938                  * First check to make sure our state is correct. We would
 5939                  * not get here unless we really did have a tag, so we don't
 5940                  * abort if this happens, just dump the chunk silently.
 5941                  */
 5942                 switch (SCTP_GET_STATE(&stcb->asoc)) {
 5943                 case SCTP_STATE_COOKIE_ECHOED:
 5944                         /*
 5945                          * we consider data with valid tags in this state
 5946                          * shows us the cookie-ack was lost. Imply it was
 5947                          * there.
 5948                          */
 5949                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5950                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5951                                     stcb->asoc.overall_error_count,
 5952                                     0,
 5953                                     SCTP_FROM_SCTP_INPUT,
 5954                                     __LINE__);
 5955                         }
 5956                         stcb->asoc.overall_error_count = 0;
 5957                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
 5958                         break;
 5959                 case SCTP_STATE_COOKIE_WAIT:
 5960                         /*
 5961                          * We consider OOTB any data sent during asoc setup.
 5962                          */
 5963                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 5964                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5965                             msg);
 5966                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
 5967                             mflowtype, mflowid, inp->fibnum,
 5968                             vrf_id, port);
 5969                         goto out;
 5970                         /* sa_ignore NOTREACHED */
 5971                         break;
 5972                 case SCTP_STATE_EMPTY:  /* should not happen */
 5973                 case SCTP_STATE_INUSE:  /* should not happen */
 5974                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
 5975                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
 5976                 default:
 5977                         goto out;
 5978                         /* sa_ignore NOTREACHED */
 5979                         break;
 5980                 case SCTP_STATE_OPEN:
 5981                 case SCTP_STATE_SHUTDOWN_SENT:
 5982                         break;
 5983                 }
 5984                 /* plow through the data chunks while length > offset */
 5985                 retval = sctp_process_data(mm, iphlen, &offset, length,
 5986                     inp, stcb, net, &high_tsn);
 5987                 if (retval == 2) {
 5988                         /*
 5989                          * The association aborted, NO UNLOCK needed since
 5990                          * the association is destroyed.
 5991                          */
 5992                         stcb = NULL;
 5993                         goto out;
 5994                 }
 5995                 data_processed = 1;
 5996                 /*
 5997                  * Anything important needs to have been m_copy'ed in
 5998                  * process_data
 5999                  */
 6000         }
 6001         /* take care of ecn */
 6002         if ((data_processed == 1) &&
 6003             (stcb->asoc.ecn_supported == 1) &&
 6004             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
 6005                 /* Yep, we need to add a ECNE */
 6006                 sctp_send_ecn_echo(stcb, net, high_tsn);
 6007         }
 6008         if ((data_processed == 0) && (fwd_tsn_seen)) {
 6009                 int was_a_gap;
 6010                 uint32_t highest_tsn;
 6011 
 6012                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
 6013                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
 6014                 } else {
 6015                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
 6016                 }
 6017                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
 6018                 stcb->asoc.send_sack = 1;
 6019                 sctp_sack_check(stcb, was_a_gap);
 6020         } else if (fwd_tsn_seen) {
 6021                 stcb->asoc.send_sack = 1;
 6022         }
 6023         /* trigger send of any chunks in queue... */
 6024 trigger_send:
 6025 #ifdef SCTP_AUDITING_ENABLED
 6026         sctp_audit_log(0xE0, 2);
 6027         sctp_auditing(1, inp, stcb, net);
 6028 #endif
 6029         SCTPDBG(SCTP_DEBUG_INPUT1,
 6030             "Check for chunk output prw:%d tqe:%d tf=%d\n",
 6031             stcb->asoc.peers_rwnd,
 6032             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
 6033             stcb->asoc.total_flight);
 6034         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
 6035         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
 6036                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
 6037         }
 6038         if (cnt_ctrl_ready || stcb->asoc.trigger_reset ||
 6039             ((un_sent) &&
 6040             (stcb->asoc.peers_rwnd > 0 ||
 6041             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
 6042                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
 6043                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);