The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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/10.0/sys/netinet/sctp_input.c 277808 2015-01-27 19:37:02Z delphij $");
   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 #include <netinet/udp.h>
   51 #include <sys/smp.h>
   52 
   53 
   54 
   55 static void
   56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
   57 {
   58         struct sctp_nets *net;
   59 
   60         /*
   61          * This now not only stops all cookie timers it also stops any INIT
   62          * timers as well. This will make sure that the timers are stopped
   63          * in all collision cases.
   64          */
   65         SCTP_TCB_LOCK_ASSERT(stcb);
   66         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
   67                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
   68                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
   69                             stcb->sctp_ep,
   70                             stcb,
   71                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
   72                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
   73                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
   74                             stcb->sctp_ep,
   75                             stcb,
   76                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
   77                 }
   78         }
   79 }
   80 
   81 /* INIT handler */
   82 static void
   83 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
   84     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
   85     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
   86     struct sctp_tcb *stcb, int *abort_no_unlock,
   87     uint8_t use_mflowid, uint32_t mflowid,
   88     uint32_t vrf_id, uint16_t port)
   89 {
   90         struct sctp_init *init;
   91         struct mbuf *op_err;
   92 
   93         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
   94             (void *)stcb);
   95         if (stcb == NULL) {
   96                 SCTP_INP_RLOCK(inp);
   97         }
   98         /* validate length */
   99         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
  100                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  101                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  102                     use_mflowid, mflowid,
  103                     vrf_id, port);
  104                 if (stcb)
  105                         *abort_no_unlock = 1;
  106                 goto outnow;
  107         }
  108         /* validate parameters */
  109         init = &cp->init;
  110         if (init->initiate_tag == 0) {
  111                 /* protocol error... send abort */
  112                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  113                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  114                     use_mflowid, mflowid,
  115                     vrf_id, port);
  116                 if (stcb)
  117                         *abort_no_unlock = 1;
  118                 goto outnow;
  119         }
  120         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
  121                 /* invalid parameter... send abort */
  122                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  123                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  124                     use_mflowid, mflowid,
  125                     vrf_id, port);
  126                 if (stcb)
  127                         *abort_no_unlock = 1;
  128                 goto outnow;
  129         }
  130         if (init->num_inbound_streams == 0) {
  131                 /* protocol error... send abort */
  132                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  133                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  134                     use_mflowid, mflowid,
  135                     vrf_id, port);
  136                 if (stcb)
  137                         *abort_no_unlock = 1;
  138                 goto outnow;
  139         }
  140         if (init->num_outbound_streams == 0) {
  141                 /* protocol error... send abort */
  142                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
  143                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  144                     use_mflowid, mflowid,
  145                     vrf_id, port);
  146                 if (stcb)
  147                         *abort_no_unlock = 1;
  148                 goto outnow;
  149         }
  150         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
  151             offset + ntohs(cp->ch.chunk_length))) {
  152                 /* auth parameter(s) error... send abort */
  153                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, NULL,
  154                     use_mflowid, mflowid,
  155                     vrf_id, port);
  156                 if (stcb)
  157                         *abort_no_unlock = 1;
  158                 goto outnow;
  159         }
  160         /*
  161          * We are only accepting if we have a socket with positive
  162          * so_qlimit.
  163          */
  164         if ((stcb == NULL) &&
  165             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
  166             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
  167             (inp->sctp_socket == NULL) ||
  168             (inp->sctp_socket->so_qlimit == 0))) {
  169                 /*
  170                  * FIX ME ?? What about TCP model and we have a
  171                  * match/restart case? Actually no fix is needed. the lookup
  172                  * will always find the existing assoc so stcb would not be
  173                  * NULL. It may be questionable to do this since we COULD
  174                  * just send back the INIT-ACK and hope that the app did
  175                  * accept()'s by the time the COOKIE was sent. But there is
  176                  * a price to pay for COOKIE generation and I don't want to
  177                  * pay it on the chance that the app will actually do some
  178                  * accepts(). The App just looses and should NOT be in this
  179                  * state :-)
  180                  */
  181                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
  182                         sctp_send_abort(m, iphlen, src, dst, sh, 0, NULL,
  183                             use_mflowid, mflowid,
  184                             vrf_id, port);
  185                 }
  186                 goto outnow;
  187         }
  188         if ((stcb != NULL) &&
  189             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
  190                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
  191                 sctp_send_shutdown_ack(stcb, NULL);
  192                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
  193         } else {
  194                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
  195                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
  196                     sh, cp,
  197                     use_mflowid, mflowid,
  198                     vrf_id, port,
  199                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
  200         }
  201 outnow:
  202         if (stcb == NULL) {
  203                 SCTP_INP_RUNLOCK(inp);
  204         }
  205 }
  206 
  207 /*
  208  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
  209  */
  210 
  211 int
  212 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
  213 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
  214     SCTP_UNUSED
  215 #endif
  216 )
  217 {
  218         int unsent_data = 0;
  219         unsigned int i;
  220         struct sctp_stream_queue_pending *sp;
  221         struct sctp_association *asoc;
  222 
  223         /*
  224          * This function returns the number of streams that have true unsent
  225          * data on them. Note that as it looks through it will clean up any
  226          * places that have old data that has been sent but left at top of
  227          * stream queue.
  228          */
  229         asoc = &stcb->asoc;
  230         SCTP_TCB_SEND_LOCK(stcb);
  231         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
  232                 /* Check to see if some data queued */
  233                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
  234                         /* sa_ignore FREED_MEMORY */
  235                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
  236                         if (sp == NULL) {
  237                                 continue;
  238                         }
  239                         if ((sp->msg_is_complete) &&
  240                             (sp->length == 0) &&
  241                             (sp->sender_all_done)) {
  242                                 /*
  243                                  * We are doing differed cleanup. Last time
  244                                  * through when we took all the data the
  245                                  * sender_all_done was not set.
  246                                  */
  247                                 if (sp->put_last_out == 0) {
  248                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
  249                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
  250                                             sp->sender_all_done,
  251                                             sp->length,
  252                                             sp->msg_is_complete,
  253                                             sp->put_last_out);
  254                                 }
  255                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
  256                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
  257                                 if (sp->net) {
  258                                         sctp_free_remote_addr(sp->net);
  259                                         sp->net = NULL;
  260                                 }
  261                                 if (sp->data) {
  262                                         sctp_m_freem(sp->data);
  263                                         sp->data = NULL;
  264                                 }
  265                                 sctp_free_a_strmoq(stcb, sp, so_locked);
  266                         } else {
  267                                 unsent_data++;
  268                                 break;
  269                         }
  270                 }
  271         }
  272         SCTP_TCB_SEND_UNLOCK(stcb);
  273         return (unsent_data);
  274 }
  275 
  276 static int
  277 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
  278 {
  279         struct sctp_init *init;
  280         struct sctp_association *asoc;
  281         struct sctp_nets *lnet;
  282         unsigned int i;
  283 
  284         init = &cp->init;
  285         asoc = &stcb->asoc;
  286         /* save off parameters */
  287         asoc->peer_vtag = ntohl(init->initiate_tag);
  288         asoc->peers_rwnd = ntohl(init->a_rwnd);
  289         /* init tsn's */
  290         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
  291 
  292         if (!TAILQ_EMPTY(&asoc->nets)) {
  293                 /* update any ssthresh's that may have a default */
  294                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
  295                         lnet->ssthresh = asoc->peers_rwnd;
  296                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
  297                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
  298                         }
  299                 }
  300         }
  301         SCTP_TCB_SEND_LOCK(stcb);
  302         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
  303                 unsigned int newcnt;
  304                 struct sctp_stream_out *outs;
  305                 struct sctp_stream_queue_pending *sp, *nsp;
  306                 struct sctp_tmit_chunk *chk, *nchk;
  307 
  308                 /* abandon the upper streams */
  309                 newcnt = ntohs(init->num_inbound_streams);
  310                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
  311                         if (chk->rec.data.stream_number >= newcnt) {
  312                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
  313                                 asoc->send_queue_cnt--;
  314                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
  315                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
  316 #ifdef INVARIANTS
  317                                 } else {
  318                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
  319 #endif
  320                                 }
  321                                 if (chk->data != NULL) {
  322                                         sctp_free_bufspace(stcb, asoc, chk, 1);
  323                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
  324                                             0, chk, SCTP_SO_NOT_LOCKED);
  325                                         if (chk->data) {
  326                                                 sctp_m_freem(chk->data);
  327                                                 chk->data = NULL;
  328                                         }
  329                                 }
  330                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  331                                 /* sa_ignore FREED_MEMORY */
  332                         }
  333                 }
  334                 if (asoc->strmout) {
  335                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
  336                                 outs = &asoc->strmout[i];
  337                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
  338                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
  339                                         asoc->stream_queue_cnt--;
  340                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
  341                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
  342                                         if (sp->data) {
  343                                                 sctp_m_freem(sp->data);
  344                                                 sp->data = NULL;
  345                                         }
  346                                         if (sp->net) {
  347                                                 sctp_free_remote_addr(sp->net);
  348                                                 sp->net = NULL;
  349                                         }
  350                                         /* Free the chunk */
  351                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
  352                                         /* sa_ignore FREED_MEMORY */
  353                                 }
  354                         }
  355                 }
  356                 /* cut back the count */
  357                 asoc->pre_open_streams = newcnt;
  358         }
  359         SCTP_TCB_SEND_UNLOCK(stcb);
  360         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
  361 
  362         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
  363         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
  364         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
  365                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
  366         }
  367         /* This is the next one we expect */
  368         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
  369 
  370         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
  371         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
  372 
  373         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
  374         /* open the requested streams */
  375 
  376         if (asoc->strmin != NULL) {
  377                 /* Free the old ones */
  378                 struct sctp_queued_to_read *ctl, *nctl;
  379 
  380                 for (i = 0; i < asoc->streamincnt; i++) {
  381                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
  382                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
  383                                 sctp_free_remote_addr(ctl->whoFrom);
  384                                 ctl->whoFrom = NULL;
  385                                 sctp_m_freem(ctl->data);
  386                                 ctl->data = NULL;
  387                                 sctp_free_a_readq(stcb, ctl);
  388                         }
  389                 }
  390                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
  391         }
  392         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
  393                 asoc->streamincnt = ntohs(init->num_outbound_streams);
  394         } else {
  395                 asoc->streamincnt = asoc->max_inbound_streams;
  396         }
  397         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
  398             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
  399         if (asoc->strmin == NULL) {
  400                 /* we didn't get memory for the streams! */
  401                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
  402                 return (-1);
  403         }
  404         for (i = 0; i < asoc->streamincnt; i++) {
  405                 asoc->strmin[i].stream_no = i;
  406                 asoc->strmin[i].last_sequence_delivered = 0xffff;
  407                 TAILQ_INIT(&asoc->strmin[i].inqueue);
  408                 asoc->strmin[i].delivery_started = 0;
  409         }
  410         /*
  411          * load_address_from_init will put the addresses into the
  412          * association when the COOKIE is processed or the INIT-ACK is
  413          * processed. Both types of COOKIE's existing and new call this
  414          * routine. It will remove addresses that are no longer in the
  415          * association (for the restarting case where addresses are
  416          * removed). Up front when the INIT arrives we will discard it if it
  417          * is a restart and new addresses have been added.
  418          */
  419         /* sa_ignore MEMLEAK */
  420         return (0);
  421 }
  422 
  423 /*
  424  * INIT-ACK message processing/consumption returns value < 0 on error
  425  */
  426 static int
  427 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
  428     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  429     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
  430     struct sctp_nets *net, int *abort_no_unlock,
  431     uint8_t use_mflowid, uint32_t mflowid,
  432     uint32_t vrf_id)
  433 {
  434         struct sctp_association *asoc;
  435         struct mbuf *op_err;
  436         int retval, abort_flag;
  437         uint32_t initack_limit;
  438         int nat_friendly = 0;
  439 
  440         /* First verify that we have no illegal param's */
  441         abort_flag = 0;
  442         op_err = NULL;
  443 
  444         op_err = sctp_arethere_unrecognized_parameters(m,
  445             (offset + sizeof(struct sctp_init_chunk)),
  446             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
  447         if (abort_flag) {
  448                 /* Send an abort and notify peer */
  449                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
  450                 *abort_no_unlock = 1;
  451                 return (-1);
  452         }
  453         asoc = &stcb->asoc;
  454         asoc->peer_supports_nat = (uint8_t) nat_friendly;
  455         /* process the peer's parameters in the INIT-ACK */
  456         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
  457         if (retval < 0) {
  458                 return (retval);
  459         }
  460         initack_limit = offset + ntohs(cp->ch.chunk_length);
  461         /* load all addresses */
  462         if ((retval = sctp_load_addresses_from_init(stcb, m,
  463             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
  464             src, dst, NULL))) {
  465                 /* Huh, we should abort */
  466                 SCTPDBG(SCTP_DEBUG_INPUT1,
  467                     "Load addresses from INIT causes an abort %d\n",
  468                     retval);
  469                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
  470                     src, dst, sh, NULL,
  471                     use_mflowid, mflowid,
  472                     vrf_id, net->port);
  473                 *abort_no_unlock = 1;
  474                 return (-1);
  475         }
  476         /* if the peer doesn't support asconf, flush the asconf queue */
  477         if (asoc->peer_supports_asconf == 0) {
  478                 struct sctp_asconf_addr *param, *nparam;
  479 
  480                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
  481                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
  482                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
  483                 }
  484         }
  485         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
  486             stcb->asoc.local_hmacs);
  487         if (op_err) {
  488                 sctp_queue_op_err(stcb, op_err);
  489                 /* queuing will steal away the mbuf chain to the out queue */
  490                 op_err = NULL;
  491         }
  492         /* extract the cookie and queue it to "echo" it back... */
  493         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  494                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
  495                     stcb->asoc.overall_error_count,
  496                     0,
  497                     SCTP_FROM_SCTP_INPUT,
  498                     __LINE__);
  499         }
  500         stcb->asoc.overall_error_count = 0;
  501         net->error_count = 0;
  502 
  503         /*
  504          * Cancel the INIT timer, We do this first before queueing the
  505          * cookie. We always cancel at the primary to assue that we are
  506          * canceling the timer started by the INIT which always goes to the
  507          * primary.
  508          */
  509         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
  510             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
  511 
  512         /* calculate the RTO */
  513         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
  514             SCTP_RTT_FROM_NON_DATA);
  515 
  516         retval = sctp_send_cookie_echo(m, offset, stcb, net);
  517         if (retval < 0) {
  518                 /*
  519                  * No cookie, we probably should send a op error. But in any
  520                  * case if there is no cookie in the INIT-ACK, we can
  521                  * abandon the peer, its broke.
  522                  */
  523                 if (retval == -3) {
  524                         /* We abort with an error of missing mandatory param */
  525                         op_err =
  526                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
  527                         if (op_err) {
  528                                 /*
  529                                  * Expand beyond to include the mandatory
  530                                  * param cookie
  531                                  */
  532                                 struct sctp_inv_mandatory_param *mp;
  533 
  534                                 SCTP_BUF_LEN(op_err) =
  535                                     sizeof(struct sctp_inv_mandatory_param);
  536                                 mp = mtod(op_err,
  537                                     struct sctp_inv_mandatory_param *);
  538                                 /* Subtract the reserved param */
  539                                 mp->length =
  540                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
  541                                 mp->num_param = htonl(1);
  542                                 mp->param = htons(SCTP_STATE_COOKIE);
  543                                 mp->resv = 0;
  544                         }
  545                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
  546                             src, dst, sh, op_err,
  547                             use_mflowid, mflowid,
  548                             vrf_id, net->port);
  549                         *abort_no_unlock = 1;
  550                 }
  551                 return (retval);
  552         }
  553         return (0);
  554 }
  555 
  556 static void
  557 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
  558     struct sctp_tcb *stcb, struct sctp_nets *net)
  559 {
  560         struct sockaddr_storage store;
  561         struct sctp_nets *r_net, *f_net;
  562         struct timeval tv;
  563         int req_prim = 0;
  564         uint16_t old_error_counter;
  565 
  566 #ifdef INET
  567         struct sockaddr_in *sin;
  568 
  569 #endif
  570 #ifdef INET6
  571         struct sockaddr_in6 *sin6;
  572 
  573 #endif
  574 
  575         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
  576                 /* Invalid length */
  577                 return;
  578         }
  579         memset(&store, 0, sizeof(store));
  580         switch (cp->heartbeat.hb_info.addr_family) {
  581 #ifdef INET
  582         case AF_INET:
  583                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
  584                         sin = (struct sockaddr_in *)&store;
  585                         sin->sin_family = cp->heartbeat.hb_info.addr_family;
  586                         sin->sin_len = cp->heartbeat.hb_info.addr_len;
  587                         sin->sin_port = stcb->rport;
  588                         memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
  589                             sizeof(sin->sin_addr));
  590                 } else {
  591                         return;
  592                 }
  593                 break;
  594 #endif
  595 #ifdef INET6
  596         case AF_INET6:
  597                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
  598                         sin6 = (struct sockaddr_in6 *)&store;
  599                         sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
  600                         sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
  601                         sin6->sin6_port = stcb->rport;
  602                         memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
  603                             sizeof(sin6->sin6_addr));
  604                 } else {
  605                         return;
  606                 }
  607                 break;
  608 #endif
  609         default:
  610                 return;
  611         }
  612         r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
  613         if (r_net == NULL) {
  614                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
  615                 return;
  616         }
  617         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  618             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
  619             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
  620                 /*
  621                  * If the its a HB and it's random value is correct when can
  622                  * confirm the destination.
  623                  */
  624                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
  625                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
  626                         stcb->asoc.primary_destination = r_net;
  627                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  628                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
  629                         if (f_net != r_net) {
  630                                 /*
  631                                  * first one on the list is NOT the primary
  632                                  * sctp_cmpaddr() is much more efficent if
  633                                  * the primary is the first on the list,
  634                                  * make it so.
  635                                  */
  636                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
  637                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
  638                         }
  639                         req_prim = 1;
  640                 }
  641                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
  642                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
  643                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
  644                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
  645         }
  646         old_error_counter = r_net->error_count;
  647         r_net->error_count = 0;
  648         r_net->hb_responded = 1;
  649         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
  650         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
  651         /* Now lets do a RTO with this */
  652         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
  653             SCTP_RTT_FROM_NON_DATA);
  654         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
  655                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
  656                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
  657                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
  658         }
  659         if (r_net->dest_state & SCTP_ADDR_PF) {
  660                 r_net->dest_state &= ~SCTP_ADDR_PF;
  661                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
  662         }
  663         if (old_error_counter > 0) {
  664                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
  665                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
  666         }
  667         if (r_net == stcb->asoc.primary_destination) {
  668                 if (stcb->asoc.alternate) {
  669                         /* release the alternate, primary is good */
  670                         sctp_free_remote_addr(stcb->asoc.alternate);
  671                         stcb->asoc.alternate = NULL;
  672                 }
  673         }
  674         /* Mobility adaptation */
  675         if (req_prim) {
  676                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
  677                     SCTP_MOBILITY_BASE) ||
  678                     sctp_is_mobility_feature_on(stcb->sctp_ep,
  679                     SCTP_MOBILITY_FASTHANDOFF)) &&
  680                     sctp_is_mobility_feature_on(stcb->sctp_ep,
  681                     SCTP_MOBILITY_PRIM_DELETED)) {
  682 
  683                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
  684                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
  685                             SCTP_MOBILITY_FASTHANDOFF)) {
  686                                 sctp_assoc_immediate_retrans(stcb,
  687                                     stcb->asoc.primary_destination);
  688                         }
  689                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
  690                             SCTP_MOBILITY_BASE)) {
  691                                 sctp_move_chunks_from_net(stcb,
  692                                     stcb->asoc.deleted_primary);
  693                         }
  694                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
  695                             stcb->asoc.deleted_primary);
  696                 }
  697         }
  698 }
  699 
  700 static int
  701 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
  702 {
  703         /*
  704          * return 0 means we want you to proceed with the abort non-zero
  705          * means no abort processing
  706          */
  707         struct sctpasochead *head;
  708 
  709         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
  710                 /* generate a new vtag and send init */
  711                 LIST_REMOVE(stcb, sctp_asocs);
  712                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
  713                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
  714                 /*
  715                  * put it in the bucket in the vtag hash of assoc's for the
  716                  * system
  717                  */
  718                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
  719                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
  720                 return (1);
  721         }
  722         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  723                 /*
  724                  * treat like a case where the cookie expired i.e.: - dump
  725                  * current cookie. - generate a new vtag. - resend init.
  726                  */
  727                 /* generate a new vtag and send init */
  728                 LIST_REMOVE(stcb, sctp_asocs);
  729                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
  730                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
  731                 sctp_stop_all_cookie_timers(stcb);
  732                 sctp_toss_old_cookies(stcb, &stcb->asoc);
  733                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
  734                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
  735                 /*
  736                  * put it in the bucket in the vtag hash of assoc's for the
  737                  * system
  738                  */
  739                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
  740                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
  741                 return (1);
  742         }
  743         return (0);
  744 }
  745 
  746 static int
  747 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
  748     struct sctp_nets *net)
  749 {
  750         /*
  751          * return 0 means we want you to proceed with the abort non-zero
  752          * means no abort processing
  753          */
  754         if (stcb->asoc.peer_supports_auth == 0) {
  755                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
  756                 return (0);
  757         }
  758         sctp_asconf_send_nat_state_update(stcb, net);
  759         return (1);
  760 }
  761 
  762 
  763 static void
  764 sctp_handle_abort(struct sctp_abort_chunk *abort,
  765     struct sctp_tcb *stcb, struct sctp_nets *net)
  766 {
  767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  768         struct socket *so;
  769 
  770 #endif
  771         uint16_t len;
  772         uint16_t error;
  773 
  774         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
  775         if (stcb == NULL)
  776                 return;
  777 
  778         len = ntohs(abort->ch.chunk_length);
  779         if (len > sizeof(struct sctp_chunkhdr)) {
  780                 /*
  781                  * Need to check the cause codes for our two magic nat
  782                  * aborts which don't kill the assoc necessarily.
  783                  */
  784                 struct sctp_missing_nat_state *natc;
  785 
  786                 natc = (struct sctp_missing_nat_state *)(abort + 1);
  787                 error = ntohs(natc->cause);
  788                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
  789                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
  790                             abort->ch.chunk_flags);
  791                         if (sctp_handle_nat_colliding_state(stcb)) {
  792                                 return;
  793                         }
  794                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
  795                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
  796                             abort->ch.chunk_flags);
  797                         if (sctp_handle_nat_missing_state(stcb, net)) {
  798                                 return;
  799                         }
  800                 }
  801         } else {
  802                 error = 0;
  803         }
  804         /* stop any receive timers */
  805         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
  806         /* notify user of the abort and clean up... */
  807         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
  808         /* free the tcb */
  809         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
  810         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
  811             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  812                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  813         }
  814 #ifdef SCTP_ASOCLOG_OF_TSNS
  815         sctp_print_out_track_log(stcb);
  816 #endif
  817 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  818         so = SCTP_INP_SO(stcb->sctp_ep);
  819         atomic_add_int(&stcb->asoc.refcnt, 1);
  820         SCTP_TCB_UNLOCK(stcb);
  821         SCTP_SOCKET_LOCK(so, 1);
  822         SCTP_TCB_LOCK(stcb);
  823         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  824 #endif
  825         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
  826         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
  827             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
  828 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  829         SCTP_SOCKET_UNLOCK(so, 1);
  830 #endif
  831         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
  832 }
  833 
  834 static void
  835 sctp_start_net_timers(struct sctp_tcb *stcb)
  836 {
  837         uint32_t cnt_hb_sent;
  838         struct sctp_nets *net;
  839 
  840         cnt_hb_sent = 0;
  841         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  842                 /*
  843                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
  844                  * If the dest in unconfirmed send a hb as well if under
  845                  * max_hb_burst have been sent.
  846                  */
  847                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
  848                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
  849                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
  850                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
  851                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  852                         cnt_hb_sent++;
  853                 }
  854         }
  855         if (cnt_hb_sent) {
  856                 sctp_chunk_output(stcb->sctp_ep, stcb,
  857                     SCTP_OUTPUT_FROM_COOKIE_ACK,
  858                     SCTP_SO_NOT_LOCKED);
  859         }
  860 }
  861 
  862 
  863 static void
  864 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
  865     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
  866 {
  867         struct sctp_association *asoc;
  868         int some_on_streamwheel;
  869 
  870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  871         struct socket *so;
  872 
  873 #endif
  874 
  875         SCTPDBG(SCTP_DEBUG_INPUT2,
  876             "sctp_handle_shutdown: handling SHUTDOWN\n");
  877         if (stcb == NULL)
  878                 return;
  879         asoc = &stcb->asoc;
  880         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
  881             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
  882                 return;
  883         }
  884         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
  885                 /* Shutdown NOT the expected size */
  886                 return;
  887         } else {
  888                 sctp_update_acked(stcb, cp, abort_flag);
  889                 if (*abort_flag) {
  890                         return;
  891                 }
  892         }
  893         if (asoc->control_pdapi) {
  894                 /*
  895                  * With a normal shutdown we assume the end of last record.
  896                  */
  897                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
  898                 asoc->control_pdapi->end_added = 1;
  899                 asoc->control_pdapi->pdapi_aborted = 1;
  900                 asoc->control_pdapi = NULL;
  901                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
  902 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  903                 so = SCTP_INP_SO(stcb->sctp_ep);
  904                 atomic_add_int(&stcb->asoc.refcnt, 1);
  905                 SCTP_TCB_UNLOCK(stcb);
  906                 SCTP_SOCKET_LOCK(so, 1);
  907                 SCTP_TCB_LOCK(stcb);
  908                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  909                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
  910                         /* assoc was freed while we were unlocked */
  911                         SCTP_SOCKET_UNLOCK(so, 1);
  912                         return;
  913                 }
  914 #endif
  915                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
  916 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  917                 SCTP_SOCKET_UNLOCK(so, 1);
  918 #endif
  919         }
  920         /* goto SHUTDOWN_RECEIVED state to block new requests */
  921         if (stcb->sctp_socket) {
  922                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
  923                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
  924                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
  925                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
  926                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  927                         /*
  928                          * notify upper layer that peer has initiated a
  929                          * shutdown
  930                          */
  931                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
  932 
  933                         /* reset time */
  934                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
  935                 }
  936         }
  937         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
  938                 /*
  939                  * stop the shutdown timer, since we WILL move to
  940                  * SHUTDOWN-ACK-SENT.
  941                  */
  942                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
  943         }
  944         /* Now is there unsent data on a stream somewhere? */
  945         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
  946 
  947         if (!TAILQ_EMPTY(&asoc->send_queue) ||
  948             !TAILQ_EMPTY(&asoc->sent_queue) ||
  949             some_on_streamwheel) {
  950                 /* By returning we will push more data out */
  951                 return;
  952         } else {
  953                 /* no outstanding data to send, so move on... */
  954                 /* send SHUTDOWN-ACK */
  955                 /* move to SHUTDOWN-ACK-SENT state */
  956                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
  957                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  958                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  959                 }
  960                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
  961                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  962                 sctp_stop_timers_for_shutdown(stcb);
  963                 sctp_send_shutdown_ack(stcb, net);
  964                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
  965                     stcb, net);
  966         }
  967 }
  968 
  969 static void
  970 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
  971     struct sctp_tcb *stcb,
  972     struct sctp_nets *net)
  973 {
  974         struct sctp_association *asoc;
  975 
  976 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  977         struct socket *so;
  978 
  979         so = SCTP_INP_SO(stcb->sctp_ep);
  980 #endif
  981         SCTPDBG(SCTP_DEBUG_INPUT2,
  982             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
  983         if (stcb == NULL)
  984                 return;
  985 
  986         asoc = &stcb->asoc;
  987         /* process according to association state */
  988         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
  989             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
  990                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
  991                 sctp_send_shutdown_complete(stcb, net, 1);
  992                 SCTP_TCB_UNLOCK(stcb);
  993                 return;
  994         }
  995         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
  996             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
  997                 /* unexpected SHUTDOWN-ACK... so ignore... */
  998                 SCTP_TCB_UNLOCK(stcb);
  999                 return;
 1000         }
 1001         if (asoc->control_pdapi) {
 1002                 /*
 1003                  * With a normal shutdown we assume the end of last record.
 1004                  */
 1005                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 1006                 asoc->control_pdapi->end_added = 1;
 1007                 asoc->control_pdapi->pdapi_aborted = 1;
 1008                 asoc->control_pdapi = NULL;
 1009                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 1010 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1011                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1012                 SCTP_TCB_UNLOCK(stcb);
 1013                 SCTP_SOCKET_LOCK(so, 1);
 1014                 SCTP_TCB_LOCK(stcb);
 1015                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1016                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1017                         /* assoc was freed while we were unlocked */
 1018                         SCTP_SOCKET_UNLOCK(so, 1);
 1019                         return;
 1020                 }
 1021 #endif
 1022                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 1023 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1024                 SCTP_SOCKET_UNLOCK(so, 1);
 1025 #endif
 1026         }
 1027 #ifdef INVARIANTS
 1028         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 1029             !TAILQ_EMPTY(&asoc->sent_queue) ||
 1030             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 1031                 panic("Queues are not empty when handling SHUTDOWN-ACK");
 1032         }
 1033 #endif
 1034         /* stop the timer */
 1035         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 1036         /* send SHUTDOWN-COMPLETE */
 1037         sctp_send_shutdown_complete(stcb, net, 0);
 1038         /* notify upper layer protocol */
 1039         if (stcb->sctp_socket) {
 1040                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1041                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 1042                         stcb->sctp_socket->so_snd.sb_cc = 0;
 1043                 }
 1044                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 1045         }
 1046         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 1047         /* free the TCB but first save off the ep */
 1048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1049         atomic_add_int(&stcb->asoc.refcnt, 1);
 1050         SCTP_TCB_UNLOCK(stcb);
 1051         SCTP_SOCKET_LOCK(so, 1);
 1052         SCTP_TCB_LOCK(stcb);
 1053         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1054 #endif
 1055         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 1056             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 1057 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1058         SCTP_SOCKET_UNLOCK(so, 1);
 1059 #endif
 1060 }
 1061 
 1062 /*
 1063  * Skip past the param header and then we will find the chunk that caused the
 1064  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
 1065  * our peer must be broken.
 1066  */
 1067 static void
 1068 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
 1069     struct sctp_nets *net)
 1070 {
 1071         struct sctp_chunkhdr *chk;
 1072 
 1073         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
 1074         switch (chk->chunk_type) {
 1075         case SCTP_ASCONF_ACK:
 1076         case SCTP_ASCONF:
 1077                 sctp_asconf_cleanup(stcb, net);
 1078                 break;
 1079         case SCTP_FORWARD_CUM_TSN:
 1080                 stcb->asoc.peer_supports_prsctp = 0;
 1081                 break;
 1082         default:
 1083                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1084                     "Peer does not support chunk type %d(%x)??\n",
 1085                     chk->chunk_type, (uint32_t) chk->chunk_type);
 1086                 break;
 1087         }
 1088 }
 1089 
 1090 /*
 1091  * Skip past the param header and then we will find the param that caused the
 1092  * problem.  There are a number of param's in a ASCONF OR the prsctp param
 1093  * these will turn of specific features.
 1094  */
 1095 static void
 1096 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
 1097 {
 1098         struct sctp_paramhdr *pbad;
 1099 
 1100         pbad = phdr + 1;
 1101         switch (ntohs(pbad->param_type)) {
 1102                 /* pr-sctp draft */
 1103         case SCTP_PRSCTP_SUPPORTED:
 1104                 stcb->asoc.peer_supports_prsctp = 0;
 1105                 break;
 1106         case SCTP_SUPPORTED_CHUNK_EXT:
 1107                 break;
 1108                 /* draft-ietf-tsvwg-addip-sctp */
 1109         case SCTP_HAS_NAT_SUPPORT:
 1110                 stcb->asoc.peer_supports_nat = 0;
 1111                 break;
 1112         case SCTP_ADD_IP_ADDRESS:
 1113         case SCTP_DEL_IP_ADDRESS:
 1114         case SCTP_SET_PRIM_ADDR:
 1115                 stcb->asoc.peer_supports_asconf = 0;
 1116                 break;
 1117         case SCTP_SUCCESS_REPORT:
 1118         case SCTP_ERROR_CAUSE_IND:
 1119                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
 1120                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1121                     "Turning off ASCONF to this strange peer\n");
 1122                 stcb->asoc.peer_supports_asconf = 0;
 1123                 break;
 1124         default:
 1125                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1126                     "Peer does not support param type %d(%x)??\n",
 1127                     pbad->param_type, (uint32_t) pbad->param_type);
 1128                 break;
 1129         }
 1130 }
 1131 
 1132 static int
 1133 sctp_handle_error(struct sctp_chunkhdr *ch,
 1134     struct sctp_tcb *stcb, struct sctp_nets *net)
 1135 {
 1136         int chklen;
 1137         struct sctp_paramhdr *phdr;
 1138         uint16_t error, error_type;
 1139         uint16_t error_len;
 1140         struct sctp_association *asoc;
 1141         int adjust;
 1142 
 1143 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1144         struct socket *so;
 1145 
 1146 #endif
 1147 
 1148         /* parse through all of the errors and process */
 1149         asoc = &stcb->asoc;
 1150         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
 1151             sizeof(struct sctp_chunkhdr));
 1152         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
 1153         error = 0;
 1154         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
 1155                 /* Process an Error Cause */
 1156                 error_type = ntohs(phdr->param_type);
 1157                 error_len = ntohs(phdr->param_length);
 1158                 if ((error_len > chklen) || (error_len == 0)) {
 1159                         /* invalid param length for this param */
 1160                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
 1161                             chklen, error_len);
 1162                         return (0);
 1163                 }
 1164                 if (error == 0) {
 1165                         /* report the first error cause */
 1166                         error = error_type;
 1167                 }
 1168                 switch (error_type) {
 1169                 case SCTP_CAUSE_INVALID_STREAM:
 1170                 case SCTP_CAUSE_MISSING_PARAM:
 1171                 case SCTP_CAUSE_INVALID_PARAM:
 1172                 case SCTP_CAUSE_NO_USER_DATA:
 1173                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
 1174                             error_type);
 1175                         break;
 1176                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
 1177                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 1178                             ch->chunk_flags);
 1179                         if (sctp_handle_nat_colliding_state(stcb)) {
 1180                                 return (0);
 1181                         }
 1182                         break;
 1183                 case SCTP_CAUSE_NAT_MISSING_STATE:
 1184                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 1185                             ch->chunk_flags);
 1186                         if (sctp_handle_nat_missing_state(stcb, net)) {
 1187                                 return (0);
 1188                         }
 1189                         break;
 1190                 case SCTP_CAUSE_STALE_COOKIE:
 1191                         /*
 1192                          * We only act if we have echoed a cookie and are
 1193                          * waiting.
 1194                          */
 1195                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
 1196                                 int *p;
 1197 
 1198                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
 1199                                 /* Save the time doubled */
 1200                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
 1201                                 asoc->stale_cookie_count++;
 1202                                 if (asoc->stale_cookie_count >
 1203                                     asoc->max_init_times) {
 1204                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
 1205                                         /* now free the asoc */
 1206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1207                                         so = SCTP_INP_SO(stcb->sctp_ep);
 1208                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 1209                                         SCTP_TCB_UNLOCK(stcb);
 1210                                         SCTP_SOCKET_LOCK(so, 1);
 1211                                         SCTP_TCB_LOCK(stcb);
 1212                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1213 #endif
 1214                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 1215                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
 1216 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1217                                         SCTP_SOCKET_UNLOCK(so, 1);
 1218 #endif
 1219                                         return (-1);
 1220                                 }
 1221                                 /* blast back to INIT state */
 1222                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 1223                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
 1224                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
 1225                                 sctp_stop_all_cookie_timers(stcb);
 1226                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 1227                         }
 1228                         break;
 1229                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
 1230                         /*
 1231                          * Nothing we can do here, we don't do hostname
 1232                          * addresses so if the peer does not like my IPv6
 1233                          * (or IPv4 for that matter) it does not matter. If
 1234                          * they don't support that type of address, they can
 1235                          * NOT possibly get that packet type... i.e. with no
 1236                          * IPv6 you can't recieve a IPv6 packet. so we can
 1237                          * safely ignore this one. If we ever added support
 1238                          * for HOSTNAME Addresses, then we would need to do
 1239                          * something here.
 1240                          */
 1241                         break;
 1242                 case SCTP_CAUSE_UNRECOG_CHUNK:
 1243                         sctp_process_unrecog_chunk(stcb, phdr, net);
 1244                         break;
 1245                 case SCTP_CAUSE_UNRECOG_PARAM:
 1246                         sctp_process_unrecog_param(stcb, phdr);
 1247                         break;
 1248                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
 1249                         /*
 1250                          * We ignore this since the timer will drive out a
 1251                          * new cookie anyway and there timer will drive us
 1252                          * to send a SHUTDOWN_COMPLETE. We can't send one
 1253                          * here since we don't have their tag.
 1254                          */
 1255                         break;
 1256                 case SCTP_CAUSE_DELETING_LAST_ADDR:
 1257                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
 1258                 case SCTP_CAUSE_DELETING_SRC_ADDR:
 1259                         /*
 1260                          * We should NOT get these here, but in a
 1261                          * ASCONF-ACK.
 1262                          */
 1263                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
 1264                             error_type);
 1265                         break;
 1266                 case SCTP_CAUSE_OUT_OF_RESC:
 1267                         /*
 1268                          * And what, pray tell do we do with the fact that
 1269                          * the peer is out of resources? Not really sure we
 1270                          * could do anything but abort. I suspect this
 1271                          * should have came WITH an abort instead of in a
 1272                          * OP-ERROR.
 1273                          */
 1274                         break;
 1275                 default:
 1276                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
 1277                             error_type);
 1278                         break;
 1279                 }
 1280                 adjust = SCTP_SIZE32(error_len);
 1281                 chklen -= adjust;
 1282                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
 1283         }
 1284         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
 1285         return (0);
 1286 }
 1287 
 1288 static int
 1289 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
 1290     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 1291     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 1292     struct sctp_nets *net, int *abort_no_unlock,
 1293     uint8_t use_mflowid, uint32_t mflowid,
 1294     uint32_t vrf_id)
 1295 {
 1296         struct sctp_init_ack *init_ack;
 1297         struct mbuf *op_err;
 1298 
 1299         SCTPDBG(SCTP_DEBUG_INPUT2,
 1300             "sctp_handle_init_ack: handling INIT-ACK\n");
 1301 
 1302         if (stcb == NULL) {
 1303                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1304                     "sctp_handle_init_ack: TCB is null\n");
 1305                 return (-1);
 1306         }
 1307         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
 1308                 /* Invalid length */
 1309                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1310                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1311                     src, dst, sh, op_err,
 1312                     use_mflowid, mflowid,
 1313                     vrf_id, net->port);
 1314                 *abort_no_unlock = 1;
 1315                 return (-1);
 1316         }
 1317         init_ack = &cp->init;
 1318         /* validate parameters */
 1319         if (init_ack->initiate_tag == 0) {
 1320                 /* protocol error... send an abort */
 1321                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1322                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1323                     src, dst, sh, op_err,
 1324                     use_mflowid, mflowid,
 1325                     vrf_id, net->port);
 1326                 *abort_no_unlock = 1;
 1327                 return (-1);
 1328         }
 1329         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
 1330                 /* protocol error... send an abort */
 1331                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1332                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1333                     src, dst, sh, op_err,
 1334                     use_mflowid, mflowid,
 1335                     vrf_id, net->port);
 1336                 *abort_no_unlock = 1;
 1337                 return (-1);
 1338         }
 1339         if (init_ack->num_inbound_streams == 0) {
 1340                 /* protocol error... send an abort */
 1341                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1342                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1343                     src, dst, sh, op_err,
 1344                     use_mflowid, mflowid,
 1345                     vrf_id, net->port);
 1346                 *abort_no_unlock = 1;
 1347                 return (-1);
 1348         }
 1349         if (init_ack->num_outbound_streams == 0) {
 1350                 /* protocol error... send an abort */
 1351                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 1352                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1353                     src, dst, sh, op_err,
 1354                     use_mflowid, mflowid,
 1355                     vrf_id, net->port);
 1356                 *abort_no_unlock = 1;
 1357                 return (-1);
 1358         }
 1359         /* process according to association state... */
 1360         switch (stcb->asoc.state & SCTP_STATE_MASK) {
 1361         case SCTP_STATE_COOKIE_WAIT:
 1362                 /* this is the expected state for this chunk */
 1363                 /* process the INIT-ACK parameters */
 1364                 if (stcb->asoc.primary_destination->dest_state &
 1365                     SCTP_ADDR_UNCONFIRMED) {
 1366                         /*
 1367                          * The primary is where we sent the INIT, we can
 1368                          * always consider it confirmed when the INIT-ACK is
 1369                          * returned. Do this before we load addresses
 1370                          * though.
 1371                          */
 1372                         stcb->asoc.primary_destination->dest_state &=
 1373                             ~SCTP_ADDR_UNCONFIRMED;
 1374                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 1375                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
 1376                 }
 1377                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
 1378                     net, abort_no_unlock,
 1379                     use_mflowid, mflowid,
 1380                     vrf_id) < 0) {
 1381                         /* error in parsing parameters */
 1382                         return (-1);
 1383                 }
 1384                 /* update our state */
 1385                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
 1386                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
 1387 
 1388                 /* reset the RTO calc */
 1389                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 1390                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 1391                             stcb->asoc.overall_error_count,
 1392                             0,
 1393                             SCTP_FROM_SCTP_INPUT,
 1394                             __LINE__);
 1395                 }
 1396                 stcb->asoc.overall_error_count = 0;
 1397                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 1398                 /*
 1399                  * collapse the init timer back in case of a exponential
 1400                  * backoff
 1401                  */
 1402                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
 1403                     stcb, net);
 1404                 /*
 1405                  * the send at the end of the inbound data processing will
 1406                  * cause the cookie to be sent
 1407                  */
 1408                 break;
 1409         case SCTP_STATE_SHUTDOWN_SENT:
 1410                 /* incorrect state... discard */
 1411                 break;
 1412         case SCTP_STATE_COOKIE_ECHOED:
 1413                 /* incorrect state... discard */
 1414                 break;
 1415         case SCTP_STATE_OPEN:
 1416                 /* incorrect state... discard */
 1417                 break;
 1418         case SCTP_STATE_EMPTY:
 1419         case SCTP_STATE_INUSE:
 1420         default:
 1421                 /* incorrect state... discard */
 1422                 return (-1);
 1423                 break;
 1424         }
 1425         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
 1426         return (0);
 1427 }
 1428 
 1429 static struct sctp_tcb *
 1430 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 1431     struct sockaddr *src, struct sockaddr *dst,
 1432     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 1433     struct sctp_inpcb *inp, struct sctp_nets **netp,
 1434     struct sockaddr *init_src, int *notification,
 1435     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 1436     uint8_t use_mflowid, uint32_t mflowid,
 1437     uint32_t vrf_id, uint16_t port);
 1438 
 1439 
 1440 /*
 1441  * handle a state cookie for an existing association m: input packet mbuf
 1442  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
 1443  * "split" mbuf and the cookie signature does not exist offset: offset into
 1444  * mbuf to the cookie-echo chunk
 1445  */
 1446 static struct sctp_tcb *
 1447 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
 1448     struct sockaddr *src, struct sockaddr *dst,
 1449     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 1450     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
 1451     struct sockaddr *init_src, int *notification,
 1452     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 1453     uint8_t use_mflowid, uint32_t mflowid,
 1454     uint32_t vrf_id, uint16_t port)
 1455 {
 1456         struct sctp_association *asoc;
 1457         struct sctp_init_chunk *init_cp, init_buf;
 1458         struct sctp_init_ack_chunk *initack_cp, initack_buf;
 1459         struct sctp_nets *net;
 1460         struct mbuf *op_err;
 1461         struct sctp_paramhdr *ph;
 1462         int init_offset, initack_offset, i;
 1463         int retval;
 1464         int spec_flag = 0;
 1465         uint32_t how_indx;
 1466 
 1467         net = *netp;
 1468         /* I know that the TCB is non-NULL from the caller */
 1469         asoc = &stcb->asoc;
 1470         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
 1471                 if (asoc->cookie_how[how_indx] == 0)
 1472                         break;
 1473         }
 1474         if (how_indx < sizeof(asoc->cookie_how)) {
 1475                 asoc->cookie_how[how_indx] = 1;
 1476         }
 1477         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 1478                 /* SHUTDOWN came in after sending INIT-ACK */
 1479                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 1480                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 1481                     0, M_NOWAIT, 1, MT_DATA);
 1482                 if (op_err == NULL) {
 1483                         /* FOOBAR */
 1484                         return (NULL);
 1485                 }
 1486                 /* Set the len */
 1487                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
 1488                 ph = mtod(op_err, struct sctp_paramhdr *);
 1489                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
 1490                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
 1491                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
 1492                     use_mflowid, mflowid,
 1493                     vrf_id, net->port);
 1494                 if (how_indx < sizeof(asoc->cookie_how))
 1495                         asoc->cookie_how[how_indx] = 2;
 1496                 return (NULL);
 1497         }
 1498         /*
 1499          * find and validate the INIT chunk in the cookie (peer's info) the
 1500          * INIT should start after the cookie-echo header struct (chunk
 1501          * header, state cookie header struct)
 1502          */
 1503         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
 1504 
 1505         init_cp = (struct sctp_init_chunk *)
 1506             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
 1507             (uint8_t *) & init_buf);
 1508         if (init_cp == NULL) {
 1509                 /* could not pull a INIT chunk in cookie */
 1510                 return (NULL);
 1511         }
 1512         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
 1513                 return (NULL);
 1514         }
 1515         /*
 1516          * find and validate the INIT-ACK chunk in the cookie (my info) the
 1517          * INIT-ACK follows the INIT chunk
 1518          */
 1519         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
 1520         initack_cp = (struct sctp_init_ack_chunk *)
 1521             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
 1522             (uint8_t *) & initack_buf);
 1523         if (initack_cp == NULL) {
 1524                 /* could not pull INIT-ACK chunk in cookie */
 1525                 return (NULL);
 1526         }
 1527         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
 1528                 return (NULL);
 1529         }
 1530         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1531             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
 1532                 /*
 1533                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
 1534                  * to get into the OPEN state
 1535                  */
 1536                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
 1537                         /*-
 1538                          * Opps, this means that we somehow generated two vtag's
 1539                          * the same. I.e. we did:
 1540                          *  Us               Peer
 1541                          *   <---INIT(tag=a)------
 1542                          *   ----INIT-ACK(tag=t)-->
 1543                          *   ----INIT(tag=t)------> *1
 1544                          *   <---INIT-ACK(tag=a)---
 1545                          *   <----CE(tag=t)------------- *2
 1546                          *
 1547                          * At point *1 we should be generating a different
 1548                          * tag t'. Which means we would throw away the CE and send
 1549                          * ours instead. Basically this is case C (throw away side).
 1550                          */
 1551                         if (how_indx < sizeof(asoc->cookie_how))
 1552                                 asoc->cookie_how[how_indx] = 17;
 1553                         return (NULL);
 1554 
 1555                 }
 1556                 switch SCTP_GET_STATE
 1557                         (asoc) {
 1558                 case SCTP_STATE_COOKIE_WAIT:
 1559                 case SCTP_STATE_COOKIE_ECHOED:
 1560                         /*
 1561                          * INIT was sent but got a COOKIE_ECHO with the
 1562                          * correct tags... just accept it...but we must
 1563                          * process the init so that we can make sure we have
 1564                          * the right seq no's.
 1565                          */
 1566                         /* First we must process the INIT !! */
 1567                         retval = sctp_process_init(init_cp, stcb);
 1568                         if (retval < 0) {
 1569                                 if (how_indx < sizeof(asoc->cookie_how))
 1570                                         asoc->cookie_how[how_indx] = 3;
 1571                                 return (NULL);
 1572                         }
 1573                         /* we have already processed the INIT so no problem */
 1574                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
 1575                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
 1576                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
 1577                         /* update current state */
 1578                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
 1579                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 1580                         else
 1581                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1582 
 1583                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1584                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1585                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1586                                     stcb->sctp_ep, stcb, asoc->primary_destination);
 1587                         }
 1588                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1589                         sctp_stop_all_cookie_timers(stcb);
 1590                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1591                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 1592                             (inp->sctp_socket->so_qlimit == 0)
 1593                             ) {
 1594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1595                                 struct socket *so;
 1596 
 1597 #endif
 1598                                 /*
 1599                                  * Here is where collision would go if we
 1600                                  * did a connect() and instead got a
 1601                                  * init/init-ack/cookie done before the
 1602                                  * init-ack came back..
 1603                                  */
 1604                                 stcb->sctp_ep->sctp_flags |=
 1605                                     SCTP_PCB_FLAGS_CONNECTED;
 1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1607                                 so = SCTP_INP_SO(stcb->sctp_ep);
 1608                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1609                                 SCTP_TCB_UNLOCK(stcb);
 1610                                 SCTP_SOCKET_LOCK(so, 1);
 1611                                 SCTP_TCB_LOCK(stcb);
 1612                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1613                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1614                                         SCTP_SOCKET_UNLOCK(so, 1);
 1615                                         return (NULL);
 1616                                 }
 1617 #endif
 1618                                 soisconnected(stcb->sctp_socket);
 1619 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1620                                 SCTP_SOCKET_UNLOCK(so, 1);
 1621 #endif
 1622                         }
 1623                         /* notify upper layer */
 1624                         *notification = SCTP_NOTIFY_ASSOC_UP;
 1625                         /*
 1626                          * since we did not send a HB make sure we don't
 1627                          * double things
 1628                          */
 1629                         net->hb_responded = 1;
 1630                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
 1631                             &cookie->time_entered,
 1632                             sctp_align_unsafe_makecopy,
 1633                             SCTP_RTT_FROM_NON_DATA);
 1634 
 1635                         if (stcb->asoc.sctp_autoclose_ticks &&
 1636                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
 1637                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
 1638                                     inp, stcb, NULL);
 1639                         }
 1640                         break;
 1641                 default:
 1642                         /*
 1643                          * we're in the OPEN state (or beyond), so peer must
 1644                          * have simply lost the COOKIE-ACK
 1645                          */
 1646                         break;
 1647                         }       /* end switch */
 1648                 sctp_stop_all_cookie_timers(stcb);
 1649                 /*
 1650                  * We ignore the return code here.. not sure if we should
 1651                  * somehow abort.. but we do have an existing asoc. This
 1652                  * really should not fail.
 1653                  */
 1654                 if (sctp_load_addresses_from_init(stcb, m,
 1655                     init_offset + sizeof(struct sctp_init_chunk),
 1656                     initack_offset, src, dst, init_src)) {
 1657                         if (how_indx < sizeof(asoc->cookie_how))
 1658                                 asoc->cookie_how[how_indx] = 4;
 1659                         return (NULL);
 1660                 }
 1661                 /* respond with a COOKIE-ACK */
 1662                 sctp_toss_old_cookies(stcb, asoc);
 1663                 sctp_send_cookie_ack(stcb);
 1664                 if (how_indx < sizeof(asoc->cookie_how))
 1665                         asoc->cookie_how[how_indx] = 5;
 1666                 return (stcb);
 1667         }
 1668         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
 1669             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
 1670             cookie->tie_tag_my_vtag == 0 &&
 1671             cookie->tie_tag_peer_vtag == 0) {
 1672                 /*
 1673                  * case C in Section 5.2.4 Table 2: XMOO silently discard
 1674                  */
 1675                 if (how_indx < sizeof(asoc->cookie_how))
 1676                         asoc->cookie_how[how_indx] = 6;
 1677                 return (NULL);
 1678         }
 1679         /*
 1680          * If nat support, and the below and stcb is established, send back
 1681          * a ABORT(colliding state) if we are established.
 1682          */
 1683         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
 1684             (asoc->peer_supports_nat) &&
 1685             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1686             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
 1687             (asoc->peer_vtag == 0)))) {
 1688                 /*
 1689                  * Special case - Peer's support nat. We may have two init's
 1690                  * that we gave out the same tag on since one was not
 1691                  * established.. i.e. we get INIT from host-1 behind the nat
 1692                  * and we respond tag-a, we get a INIT from host-2 behind
 1693                  * the nat and we get tag-a again. Then we bring up host-1
 1694                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
 1695                  * Now we have colliding state. We must send an abort here
 1696                  * with colliding state indication.
 1697                  */
 1698                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 1699                     0, M_NOWAIT, 1, MT_DATA);
 1700                 if (op_err == NULL) {
 1701                         /* FOOBAR */
 1702                         return (NULL);
 1703                 }
 1704                 /* pre-reserve some space */
 1705 #ifdef INET6
 1706                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 1707 #else
 1708                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 1709 #endif
 1710                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 1711                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 1712                 /* Set the len */
 1713                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
 1714                 ph = mtod(op_err, struct sctp_paramhdr *);
 1715                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
 1716                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
 1717                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 1718                     use_mflowid, mflowid,
 1719                     vrf_id, port);
 1720                 return (NULL);
 1721         }
 1722         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1723             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
 1724             (asoc->peer_vtag == 0))) {
 1725                 /*
 1726                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
 1727                  * should be ok, re-accept peer info
 1728                  */
 1729                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
 1730                         /*
 1731                          * Extension of case C. If we hit this, then the
 1732                          * random number generator returned the same vtag
 1733                          * when we first sent our INIT-ACK and when we later
 1734                          * sent our INIT. The side with the seq numbers that
 1735                          * are different will be the one that normnally
 1736                          * would have hit case C. This in effect "extends"
 1737                          * our vtags in this collision case to be 64 bits.
 1738                          * The same collision could occur aka you get both
 1739                          * vtag and seq number the same twice in a row.. but
 1740                          * is much less likely. If it did happen then we
 1741                          * would proceed through and bring up the assoc.. we
 1742                          * may end up with the wrong stream setup however..
 1743                          * which would be bad.. but there is no way to
 1744                          * tell.. until we send on a stream that does not
 1745                          * exist :-)
 1746                          */
 1747                         if (how_indx < sizeof(asoc->cookie_how))
 1748                                 asoc->cookie_how[how_indx] = 7;
 1749 
 1750                         return (NULL);
 1751                 }
 1752                 if (how_indx < sizeof(asoc->cookie_how))
 1753                         asoc->cookie_how[how_indx] = 8;
 1754                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
 1755                 sctp_stop_all_cookie_timers(stcb);
 1756                 /*
 1757                  * since we did not send a HB make sure we don't double
 1758                  * things
 1759                  */
 1760                 net->hb_responded = 1;
 1761                 if (stcb->asoc.sctp_autoclose_ticks &&
 1762                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1763                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1764                             NULL);
 1765                 }
 1766                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 1767                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
 1768 
 1769                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
 1770                         /*
 1771                          * Ok the peer probably discarded our data (if we
 1772                          * echoed a cookie+data). So anything on the
 1773                          * sent_queue should be marked for retransmit, we
 1774                          * may not get something to kick us so it COULD
 1775                          * still take a timeout to move these.. but it can't
 1776                          * hurt to mark them.
 1777                          */
 1778                         struct sctp_tmit_chunk *chk;
 1779 
 1780                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 1781                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
 1782                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1783                                         sctp_flight_size_decrease(chk);
 1784                                         sctp_total_flight_decrease(stcb, chk);
 1785                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1786                                         spec_flag++;
 1787                                 }
 1788                         }
 1789 
 1790                 }
 1791                 /* process the INIT info (peer's info) */
 1792                 retval = sctp_process_init(init_cp, stcb);
 1793                 if (retval < 0) {
 1794                         if (how_indx < sizeof(asoc->cookie_how))
 1795                                 asoc->cookie_how[how_indx] = 9;
 1796                         return (NULL);
 1797                 }
 1798                 if (sctp_load_addresses_from_init(stcb, m,
 1799                     init_offset + sizeof(struct sctp_init_chunk),
 1800                     initack_offset, src, dst, init_src)) {
 1801                         if (how_indx < sizeof(asoc->cookie_how))
 1802                                 asoc->cookie_how[how_indx] = 10;
 1803                         return (NULL);
 1804                 }
 1805                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
 1806                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
 1807                         *notification = SCTP_NOTIFY_ASSOC_UP;
 1808 
 1809                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1810                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 1811                             (inp->sctp_socket->so_qlimit == 0)) {
 1812 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1813                                 struct socket *so;
 1814 
 1815 #endif
 1816                                 stcb->sctp_ep->sctp_flags |=
 1817                                     SCTP_PCB_FLAGS_CONNECTED;
 1818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1819                                 so = SCTP_INP_SO(stcb->sctp_ep);
 1820                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1821                                 SCTP_TCB_UNLOCK(stcb);
 1822                                 SCTP_SOCKET_LOCK(so, 1);
 1823                                 SCTP_TCB_LOCK(stcb);
 1824                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1825                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1826                                         SCTP_SOCKET_UNLOCK(so, 1);
 1827                                         return (NULL);
 1828                                 }
 1829 #endif
 1830                                 soisconnected(stcb->sctp_socket);
 1831 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1832                                 SCTP_SOCKET_UNLOCK(so, 1);
 1833 #endif
 1834                         }
 1835                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
 1836                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 1837                         else
 1838                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1839                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1840                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 1841                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
 1842                 } else {
 1843                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1844                 }
 1845                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1846                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1847                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1848                             stcb->sctp_ep, stcb, asoc->primary_destination);
 1849                 }
 1850                 sctp_stop_all_cookie_timers(stcb);
 1851                 sctp_toss_old_cookies(stcb, asoc);
 1852                 sctp_send_cookie_ack(stcb);
 1853                 if (spec_flag) {
 1854                         /*
 1855                          * only if we have retrans set do we do this. What
 1856                          * this call does is get only the COOKIE-ACK out and
 1857                          * then when we return the normal call to
 1858                          * sctp_chunk_output will get the retrans out behind
 1859                          * this.
 1860                          */
 1861                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
 1862                 }
 1863                 if (how_indx < sizeof(asoc->cookie_how))
 1864                         asoc->cookie_how[how_indx] = 11;
 1865 
 1866                 return (stcb);
 1867         }
 1868         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
 1869             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
 1870             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
 1871             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
 1872             cookie->tie_tag_peer_vtag != 0) {
 1873                 struct sctpasochead *head;
 1874 
 1875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1876                 struct socket *so;
 1877 
 1878 #endif
 1879 
 1880                 if (asoc->peer_supports_nat) {
 1881                         /*
 1882                          * This is a gross gross hack. Just call the
 1883                          * cookie_new code since we are allowing a duplicate
 1884                          * association. I hope this works...
 1885                          */
 1886                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
 1887                             sh, cookie, cookie_len,
 1888                             inp, netp, init_src, notification,
 1889                             auth_skipped, auth_offset, auth_len,
 1890                             use_mflowid, mflowid,
 1891                             vrf_id, port));
 1892                 }
 1893                 /*
 1894                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
 1895                  */
 1896                 /* temp code */
 1897                 if (how_indx < sizeof(asoc->cookie_how))
 1898                         asoc->cookie_how[how_indx] = 12;
 1899                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
 1900                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
 1901 
 1902                 /* notify upper layer */
 1903                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
 1904                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1905                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
 1906                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 1907                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 1908                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1909                 }
 1910                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 1911                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
 1912                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1913                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
 1914                 }
 1915                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1916                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1917                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1918                             stcb->sctp_ep, stcb, asoc->primary_destination);
 1919 
 1920                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
 1921                         /* move to OPEN state, if not in SHUTDOWN_SENT */
 1922                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1923                 }
 1924                 asoc->pre_open_streams =
 1925                     ntohs(initack_cp->init.num_outbound_streams);
 1926                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
 1927                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
 1928                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
 1929 
 1930                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
 1931 
 1932                 asoc->str_reset_seq_in = asoc->init_seq_number;
 1933 
 1934                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 1935                 if (asoc->mapping_array) {
 1936                         memset(asoc->mapping_array, 0,
 1937                             asoc->mapping_array_size);
 1938                 }
 1939                 if (asoc->nr_mapping_array) {
 1940                         memset(asoc->nr_mapping_array, 0,
 1941                             asoc->mapping_array_size);
 1942                 }
 1943                 SCTP_TCB_UNLOCK(stcb);
 1944 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1945                 so = SCTP_INP_SO(stcb->sctp_ep);
 1946                 SCTP_SOCKET_LOCK(so, 1);
 1947 #endif
 1948                 SCTP_INP_INFO_WLOCK();
 1949                 SCTP_INP_WLOCK(stcb->sctp_ep);
 1950                 SCTP_TCB_LOCK(stcb);
 1951                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1952                 /* send up all the data */
 1953                 SCTP_TCB_SEND_LOCK(stcb);
 1954 
 1955                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
 1956                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1957                         stcb->asoc.strmout[i].chunks_on_queues = 0;
 1958                         stcb->asoc.strmout[i].stream_no = i;
 1959                         stcb->asoc.strmout[i].next_sequence_send = 0;
 1960                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
 1961                 }
 1962                 /* process the INIT-ACK info (my info) */
 1963                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
 1964                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 1965 
 1966                 /* pull from vtag hash */
 1967                 LIST_REMOVE(stcb, sctp_asocs);
 1968                 /* re-insert to new vtag position */
 1969                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
 1970                     SCTP_BASE_INFO(hashasocmark))];
 1971                 /*
 1972                  * put it in the bucket in the vtag hash of assoc's for the
 1973                  * system
 1974                  */
 1975                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 1976 
 1977                 SCTP_TCB_SEND_UNLOCK(stcb);
 1978                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
 1979                 SCTP_INP_INFO_WUNLOCK();
 1980 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1981                 SCTP_SOCKET_UNLOCK(so, 1);
 1982 #endif
 1983                 asoc->total_flight = 0;
 1984                 asoc->total_flight_count = 0;
 1985                 /* process the INIT info (peer's info) */
 1986                 retval = sctp_process_init(init_cp, stcb);
 1987                 if (retval < 0) {
 1988                         if (how_indx < sizeof(asoc->cookie_how))
 1989                                 asoc->cookie_how[how_indx] = 13;
 1990 
 1991                         return (NULL);
 1992                 }
 1993                 /*
 1994                  * since we did not send a HB make sure we don't double
 1995                  * things
 1996                  */
 1997                 net->hb_responded = 1;
 1998 
 1999                 if (sctp_load_addresses_from_init(stcb, m,
 2000                     init_offset + sizeof(struct sctp_init_chunk),
 2001                     initack_offset, src, dst, init_src)) {
 2002                         if (how_indx < sizeof(asoc->cookie_how))
 2003                                 asoc->cookie_how[how_indx] = 14;
 2004 
 2005                         return (NULL);
 2006                 }
 2007                 /* respond with a COOKIE-ACK */
 2008                 sctp_stop_all_cookie_timers(stcb);
 2009                 sctp_toss_old_cookies(stcb, asoc);
 2010                 sctp_send_cookie_ack(stcb);
 2011                 if (how_indx < sizeof(asoc->cookie_how))
 2012                         asoc->cookie_how[how_indx] = 15;
 2013 
 2014                 return (stcb);
 2015         }
 2016         if (how_indx < sizeof(asoc->cookie_how))
 2017                 asoc->cookie_how[how_indx] = 16;
 2018         /* all other cases... */
 2019         return (NULL);
 2020 }
 2021 
 2022 
 2023 /*
 2024  * handle a state cookie for a new association m: input packet mbuf chain--
 2025  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
 2026  * and the cookie signature does not exist offset: offset into mbuf to the
 2027  * cookie-echo chunk length: length of the cookie chunk to: where the init
 2028  * was from returns a new TCB
 2029  */
 2030 static struct sctp_tcb *
 2031 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 2032     struct sockaddr *src, struct sockaddr *dst,
 2033     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 2034     struct sctp_inpcb *inp, struct sctp_nets **netp,
 2035     struct sockaddr *init_src, int *notification,
 2036     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 2037     uint8_t use_mflowid, uint32_t mflowid,
 2038     uint32_t vrf_id, uint16_t port)
 2039 {
 2040         struct sctp_tcb *stcb;
 2041         struct sctp_init_chunk *init_cp, init_buf;
 2042         struct sctp_init_ack_chunk *initack_cp, initack_buf;
 2043         struct sockaddr_storage sa_store;
 2044         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
 2045         struct sctp_association *asoc;
 2046         int init_offset, initack_offset, initack_limit;
 2047         int retval;
 2048         int error = 0;
 2049         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
 2050 
 2051 #ifdef INET
 2052         struct sockaddr_in *sin;
 2053 
 2054 #endif
 2055 #ifdef INET6
 2056         struct sockaddr_in6 *sin6;
 2057 
 2058 #endif
 2059 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2060         struct socket *so;
 2061 
 2062         so = SCTP_INP_SO(inp);
 2063 #endif
 2064 
 2065         /*
 2066          * find and validate the INIT chunk in the cookie (peer's info) the
 2067          * INIT should start after the cookie-echo header struct (chunk
 2068          * header, state cookie header struct)
 2069          */
 2070         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
 2071         init_cp = (struct sctp_init_chunk *)
 2072             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
 2073             (uint8_t *) & init_buf);
 2074         if (init_cp == NULL) {
 2075                 /* could not pull a INIT chunk in cookie */
 2076                 SCTPDBG(SCTP_DEBUG_INPUT1,
 2077                     "process_cookie_new: could not pull INIT chunk hdr\n");
 2078                 return (NULL);
 2079         }
 2080         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
 2081                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
 2082                 return (NULL);
 2083         }
 2084         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
 2085         /*
 2086          * find and validate the INIT-ACK chunk in the cookie (my info) the
 2087          * INIT-ACK follows the INIT chunk
 2088          */
 2089         initack_cp = (struct sctp_init_ack_chunk *)
 2090             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
 2091             (uint8_t *) & initack_buf);
 2092         if (initack_cp == NULL) {
 2093                 /* could not pull INIT-ACK chunk in cookie */
 2094                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
 2095                 return (NULL);
 2096         }
 2097         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
 2098                 return (NULL);
 2099         }
 2100         /*
 2101          * NOTE: We can't use the INIT_ACK's chk_length to determine the
 2102          * "initack_limit" value.  This is because the chk_length field
 2103          * includes the length of the cookie, but the cookie is omitted when
 2104          * the INIT and INIT_ACK are tacked onto the cookie...
 2105          */
 2106         initack_limit = offset + cookie_len;
 2107 
 2108         /*
 2109          * now that we know the INIT/INIT-ACK are in place, create a new TCB
 2110          * and popluate
 2111          */
 2112 
 2113         /*
 2114          * Here we do a trick, we set in NULL for the proc/thread argument.
 2115          * We do this since in effect we only use the p argument when the
 2116          * socket is unbound and we must do an implicit bind. Since we are
 2117          * getting a cookie, we cannot be unbound.
 2118          */
 2119         stcb = sctp_aloc_assoc(inp, init_src, &error,
 2120             ntohl(initack_cp->init.initiate_tag), vrf_id,
 2121             (struct thread *)NULL
 2122             );
 2123         if (stcb == NULL) {
 2124                 struct mbuf *op_err;
 2125 
 2126                 /* memory problem? */
 2127                 SCTPDBG(SCTP_DEBUG_INPUT1,
 2128                     "process_cookie_new: no room for another TCB!\n");
 2129                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 2130 
 2131                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
 2132                     src, dst, sh, op_err,
 2133                     use_mflowid, mflowid,
 2134                     vrf_id, port);
 2135                 return (NULL);
 2136         }
 2137         /* get the correct sctp_nets */
 2138         if (netp)
 2139                 *netp = sctp_findnet(stcb, init_src);
 2140 
 2141         asoc = &stcb->asoc;
 2142         /* get scope variables out of cookie */
 2143         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
 2144         asoc->scope.site_scope = cookie->site_scope;
 2145         asoc->scope.local_scope = cookie->local_scope;
 2146         asoc->scope.loopback_scope = cookie->loopback_scope;
 2147 
 2148         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
 2149             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
 2150                 struct mbuf *op_err;
 2151 
 2152                 /*
 2153                  * Houston we have a problem. The EP changed while the
 2154                  * cookie was in flight. Only recourse is to abort the
 2155                  * association.
 2156                  */
 2157                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2158                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 2159                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
 2160                     src, dst, sh, op_err,
 2161                     use_mflowid, mflowid,
 2162                     vrf_id, port);
 2163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2164                 SCTP_TCB_UNLOCK(stcb);
 2165                 SCTP_SOCKET_LOCK(so, 1);
 2166                 SCTP_TCB_LOCK(stcb);
 2167 #endif
 2168                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2169                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
 2170 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2171                 SCTP_SOCKET_UNLOCK(so, 1);
 2172 #endif
 2173                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2174                 return (NULL);
 2175         }
 2176         /* process the INIT-ACK info (my info) */
 2177         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
 2178         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 2179         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
 2180         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
 2181         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
 2182         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
 2183         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
 2184         asoc->str_reset_seq_in = asoc->init_seq_number;
 2185 
 2186         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 2187 
 2188         /* process the INIT info (peer's info) */
 2189         if (netp)
 2190                 retval = sctp_process_init(init_cp, stcb);
 2191         else
 2192                 retval = 0;
 2193         if (retval < 0) {
 2194                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2195 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2196                 SCTP_TCB_UNLOCK(stcb);
 2197                 SCTP_SOCKET_LOCK(so, 1);
 2198                 SCTP_TCB_LOCK(stcb);
 2199 #endif
 2200                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
 2201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2202                 SCTP_SOCKET_UNLOCK(so, 1);
 2203 #endif
 2204                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2205                 return (NULL);
 2206         }
 2207         /* load all addresses */
 2208         if (sctp_load_addresses_from_init(stcb, m,
 2209             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
 2210             src, dst, init_src)) {
 2211                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2212 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2213                 SCTP_TCB_UNLOCK(stcb);
 2214                 SCTP_SOCKET_LOCK(so, 1);
 2215                 SCTP_TCB_LOCK(stcb);
 2216 #endif
 2217                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
 2218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2219                 SCTP_SOCKET_UNLOCK(so, 1);
 2220 #endif
 2221                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2222                 return (NULL);
 2223         }
 2224         /*
 2225          * verify any preceding AUTH chunk that was skipped
 2226          */
 2227         /* pull the local authentication parameters from the cookie/init-ack */
 2228         sctp_auth_get_cookie_params(stcb, m,
 2229             initack_offset + sizeof(struct sctp_init_ack_chunk),
 2230             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
 2231         if (auth_skipped) {
 2232                 struct sctp_auth_chunk *auth;
 2233 
 2234                 auth = (struct sctp_auth_chunk *)
 2235                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
 2236                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
 2237                         /* auth HMAC failed, dump the assoc and packet */
 2238                         SCTPDBG(SCTP_DEBUG_AUTH1,
 2239                             "COOKIE-ECHO: AUTH failed\n");
 2240                         atomic_add_int(&stcb->asoc.refcnt, 1);
 2241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2242                         SCTP_TCB_UNLOCK(stcb);
 2243                         SCTP_SOCKET_LOCK(so, 1);
 2244                         SCTP_TCB_LOCK(stcb);
 2245 #endif
 2246                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
 2247 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2248                         SCTP_SOCKET_UNLOCK(so, 1);
 2249 #endif
 2250                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2251                         return (NULL);
 2252                 } else {
 2253                         /* remaining chunks checked... good to go */
 2254                         stcb->asoc.authenticated = 1;
 2255                 }
 2256         }
 2257         /* update current state */
 2258         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
 2259         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 2260         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 2261                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 2262                     stcb->sctp_ep, stcb, asoc->primary_destination);
 2263         }
 2264         sctp_stop_all_cookie_timers(stcb);
 2265         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
 2266         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 2267 
 2268         /*
 2269          * if we're doing ASCONFs, check to see if we have any new local
 2270          * addresses that need to get added to the peer (eg. addresses
 2271          * changed while cookie echo in flight).  This needs to be done
 2272          * after we go to the OPEN state to do the correct asconf
 2273          * processing. else, make sure we have the correct addresses in our
 2274          * lists
 2275          */
 2276 
 2277         /* warning, we re-use sin, sin6, sa_store here! */
 2278         /* pull in local_address (our "from" address) */
 2279         switch (cookie->laddr_type) {
 2280 #ifdef INET
 2281         case SCTP_IPV4_ADDRESS:
 2282                 /* source addr is IPv4 */
 2283                 sin = (struct sockaddr_in *)initack_src;
 2284                 memset(sin, 0, sizeof(*sin));
 2285                 sin->sin_family = AF_INET;
 2286                 sin->sin_len = sizeof(struct sockaddr_in);
 2287                 sin->sin_addr.s_addr = cookie->laddress[0];
 2288                 break;
 2289 #endif
 2290 #ifdef INET6
 2291         case SCTP_IPV6_ADDRESS:
 2292                 /* source addr is IPv6 */
 2293                 sin6 = (struct sockaddr_in6 *)initack_src;
 2294                 memset(sin6, 0, sizeof(*sin6));
 2295                 sin6->sin6_family = AF_INET6;
 2296                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 2297                 sin6->sin6_scope_id = cookie->scope_id;
 2298                 memcpy(&sin6->sin6_addr, cookie->laddress,
 2299                     sizeof(sin6->sin6_addr));
 2300                 break;
 2301 #endif
 2302         default:
 2303                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2304 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2305                 SCTP_TCB_UNLOCK(stcb);
 2306                 SCTP_SOCKET_LOCK(so, 1);
 2307                 SCTP_TCB_LOCK(stcb);
 2308 #endif
 2309                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
 2310 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2311                 SCTP_SOCKET_UNLOCK(so, 1);
 2312 #endif
 2313                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2314                 return (NULL);
 2315         }
 2316 
 2317         /* set up to notify upper layer */
 2318         *notification = SCTP_NOTIFY_ASSOC_UP;
 2319         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 2320             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 2321             (inp->sctp_socket->so_qlimit == 0)) {
 2322                 /*
 2323                  * This is an endpoint that called connect() how it got a
 2324                  * cookie that is NEW is a bit of a mystery. It must be that
 2325                  * the INIT was sent, but before it got there.. a complete
 2326                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
 2327                  * should have went to the other code.. not here.. oh well..
 2328                  * a bit of protection is worth having..
 2329                  */
 2330                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 2331 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2332                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2333                 SCTP_TCB_UNLOCK(stcb);
 2334                 SCTP_SOCKET_LOCK(so, 1);
 2335                 SCTP_TCB_LOCK(stcb);
 2336                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2337                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 2338                         SCTP_SOCKET_UNLOCK(so, 1);
 2339                         return (NULL);
 2340                 }
 2341 #endif
 2342                 soisconnected(stcb->sctp_socket);
 2343 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2344                 SCTP_SOCKET_UNLOCK(so, 1);
 2345 #endif
 2346         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 2347             (inp->sctp_socket->so_qlimit)) {
 2348                 /*
 2349                  * We don't want to do anything with this one. Since it is
 2350                  * the listening guy. The timer will get started for
 2351                  * accepted connections in the caller.
 2352                  */
 2353                 ;
 2354         }
 2355         /* since we did not send a HB make sure we don't double things */
 2356         if ((netp) && (*netp))
 2357                 (*netp)->hb_responded = 1;
 2358 
 2359         if (stcb->asoc.sctp_autoclose_ticks &&
 2360             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 2361                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
 2362         }
 2363         /* calculate the RTT */
 2364         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 2365         if ((netp) && (*netp)) {
 2366                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
 2367                     &cookie->time_entered, sctp_align_unsafe_makecopy,
 2368                     SCTP_RTT_FROM_NON_DATA);
 2369         }
 2370         /* respond with a COOKIE-ACK */
 2371         sctp_send_cookie_ack(stcb);
 2372 
 2373         /*
 2374          * check the address lists for any ASCONFs that need to be sent
 2375          * AFTER the cookie-ack is sent
 2376          */
 2377         sctp_check_address_list(stcb, m,
 2378             initack_offset + sizeof(struct sctp_init_ack_chunk),
 2379             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
 2380             initack_src, cookie->local_scope, cookie->site_scope,
 2381             cookie->ipv4_scope, cookie->loopback_scope);
 2382 
 2383 
 2384         return (stcb);
 2385 }
 2386 
 2387 /*
 2388  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
 2389  * we NEED to make sure we are not already using the vtag. If so we
 2390  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
 2391         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
 2392                                                             SCTP_BASE_INFO(hashasocmark))];
 2393         LIST_FOREACH(stcb, head, sctp_asocs) {
 2394                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
 2395                        -- SEND ABORT - TRY AGAIN --
 2396                 }
 2397         }
 2398 */
 2399 
 2400 /*
 2401  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
 2402  * existing (non-NULL) TCB
 2403  */
 2404 static struct mbuf *
 2405 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
 2406     struct sockaddr *src, struct sockaddr *dst,
 2407     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
 2408     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
 2409     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 2410     struct sctp_tcb **locked_tcb,
 2411     uint8_t use_mflowid, uint32_t mflowid,
 2412     uint32_t vrf_id, uint16_t port)
 2413 {
 2414         struct sctp_state_cookie *cookie;
 2415         struct sctp_tcb *l_stcb = *stcb;
 2416         struct sctp_inpcb *l_inp;
 2417         struct sockaddr *to;
 2418         struct sctp_pcb *ep;
 2419         struct mbuf *m_sig;
 2420         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
 2421         uint8_t *sig;
 2422         uint8_t cookie_ok = 0;
 2423         unsigned int sig_offset, cookie_offset;
 2424         unsigned int cookie_len;
 2425         struct timeval now;
 2426         struct timeval time_expires;
 2427         int notification = 0;
 2428         struct sctp_nets *netl;
 2429         int had_a_existing_tcb = 0;
 2430         int send_int_conf = 0;
 2431 
 2432 #ifdef INET
 2433         struct sockaddr_in sin;
 2434 
 2435 #endif
 2436 #ifdef INET6
 2437         struct sockaddr_in6 sin6;
 2438 
 2439 #endif
 2440 
 2441         SCTPDBG(SCTP_DEBUG_INPUT2,
 2442             "sctp_handle_cookie: handling COOKIE-ECHO\n");
 2443 
 2444         if (inp_p == NULL) {
 2445                 return (NULL);
 2446         }
 2447         cookie = &cp->cookie;
 2448         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
 2449         cookie_len = ntohs(cp->ch.chunk_length);
 2450 
 2451         if ((cookie->peerport != sh->src_port) &&
 2452             (cookie->myport != sh->dest_port) &&
 2453             (cookie->my_vtag != sh->v_tag)) {
 2454                 /*
 2455                  * invalid ports or bad tag.  Note that we always leave the
 2456                  * v_tag in the header in network order and when we stored
 2457                  * it in the my_vtag slot we also left it in network order.
 2458                  * This maintains the match even though it may be in the
 2459                  * opposite byte order of the machine :->
 2460                  */
 2461                 return (NULL);
 2462         }
 2463         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
 2464             sizeof(struct sctp_init_chunk) +
 2465             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
 2466                 /* cookie too small */
 2467                 return (NULL);
 2468         }
 2469         /*
 2470          * split off the signature into its own mbuf (since it should not be
 2471          * calculated in the sctp_hmac_m() call).
 2472          */
 2473         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
 2474         m_sig = m_split(m, sig_offset, M_NOWAIT);
 2475         if (m_sig == NULL) {
 2476                 /* out of memory or ?? */
 2477                 return (NULL);
 2478         }
 2479 #ifdef SCTP_MBUF_LOGGING
 2480         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 2481                 struct mbuf *mat;
 2482 
 2483                 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
 2484                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 2485                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
 2486                         }
 2487                 }
 2488         }
 2489 #endif
 2490 
 2491         /*
 2492          * compute the signature/digest for the cookie
 2493          */
 2494         ep = &(*inp_p)->sctp_ep;
 2495         l_inp = *inp_p;
 2496         if (l_stcb) {
 2497                 SCTP_TCB_UNLOCK(l_stcb);
 2498         }
 2499         SCTP_INP_RLOCK(l_inp);
 2500         if (l_stcb) {
 2501                 SCTP_TCB_LOCK(l_stcb);
 2502         }
 2503         /* which cookie is it? */
 2504         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
 2505             (ep->current_secret_number != ep->last_secret_number)) {
 2506                 /* it's the old cookie */
 2507                 (void)sctp_hmac_m(SCTP_HMAC,
 2508                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
 2509                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2510         } else {
 2511                 /* it's the current cookie */
 2512                 (void)sctp_hmac_m(SCTP_HMAC,
 2513                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
 2514                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2515         }
 2516         /* get the signature */
 2517         SCTP_INP_RUNLOCK(l_inp);
 2518         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
 2519         if (sig == NULL) {
 2520                 /* couldn't find signature */
 2521                 sctp_m_freem(m_sig);
 2522                 return (NULL);
 2523         }
 2524         /* compare the received digest with the computed digest */
 2525         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
 2526                 /* try the old cookie? */
 2527                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
 2528                     (ep->current_secret_number != ep->last_secret_number)) {
 2529                         /* compute digest with old */
 2530                         (void)sctp_hmac_m(SCTP_HMAC,
 2531                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
 2532                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2533                         /* compare */
 2534                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
 2535                                 cookie_ok = 1;
 2536                 }
 2537         } else {
 2538                 cookie_ok = 1;
 2539         }
 2540 
 2541         /*
 2542          * Now before we continue we must reconstruct our mbuf so that
 2543          * normal processing of any other chunks will work.
 2544          */
 2545         {
 2546                 struct mbuf *m_at;
 2547 
 2548                 m_at = m;
 2549                 while (SCTP_BUF_NEXT(m_at) != NULL) {
 2550                         m_at = SCTP_BUF_NEXT(m_at);
 2551                 }
 2552                 SCTP_BUF_NEXT(m_at) = m_sig;
 2553         }
 2554 
 2555         if (cookie_ok == 0) {
 2556                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
 2557                 SCTPDBG(SCTP_DEBUG_INPUT2,
 2558                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
 2559                     (uint32_t) offset, cookie_offset, sig_offset);
 2560                 return (NULL);
 2561         }
 2562         /*
 2563          * check the cookie timestamps to be sure it's not stale
 2564          */
 2565         (void)SCTP_GETTIME_TIMEVAL(&now);
 2566         /* Expire time is in Ticks, so we convert to seconds */
 2567         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
 2568         time_expires.tv_usec = cookie->time_entered.tv_usec;
 2569         /*
 2570          * TODO sctp_constants.h needs alternative time macros when _KERNEL
 2571          * is undefined.
 2572          */
 2573         if (timevalcmp(&now, &time_expires, >)) {
 2574                 /* cookie is stale! */
 2575                 struct mbuf *op_err;
 2576                 struct sctp_stale_cookie_msg *scm;
 2577                 uint32_t tim;
 2578 
 2579                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
 2580                     0, M_NOWAIT, 1, MT_DATA);
 2581                 if (op_err == NULL) {
 2582                         /* FOOBAR */
 2583                         return (NULL);
 2584                 }
 2585                 /* Set the len */
 2586                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
 2587                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
 2588                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
 2589                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
 2590                     (sizeof(uint32_t))));
 2591                 /* seconds to usec */
 2592                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
 2593                 /* add in usec */
 2594                 if (tim == 0)
 2595                         tim = now.tv_usec - cookie->time_entered.tv_usec;
 2596                 scm->time_usec = htonl(tim);
 2597                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
 2598                     use_mflowid, mflowid,
 2599                     vrf_id, port);
 2600                 return (NULL);
 2601         }
 2602         /*
 2603          * Now we must see with the lookup address if we have an existing
 2604          * asoc. This will only happen if we were in the COOKIE-WAIT state
 2605          * and a INIT collided with us and somewhere the peer sent the
 2606          * cookie on another address besides the single address our assoc
 2607          * had for him. In this case we will have one of the tie-tags set at
 2608          * least AND the address field in the cookie can be used to look it
 2609          * up.
 2610          */
 2611         to = NULL;
 2612         switch (cookie->addr_type) {
 2613 #ifdef INET6
 2614         case SCTP_IPV6_ADDRESS:
 2615                 memset(&sin6, 0, sizeof(sin6));
 2616                 sin6.sin6_family = AF_INET6;
 2617                 sin6.sin6_len = sizeof(sin6);
 2618                 sin6.sin6_port = sh->src_port;
 2619                 sin6.sin6_scope_id = cookie->scope_id;
 2620                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
 2621                     sizeof(sin6.sin6_addr.s6_addr));
 2622                 to = (struct sockaddr *)&sin6;
 2623                 break;
 2624 #endif
 2625 #ifdef INET
 2626         case SCTP_IPV4_ADDRESS:
 2627                 memset(&sin, 0, sizeof(sin));
 2628                 sin.sin_family = AF_INET;
 2629                 sin.sin_len = sizeof(sin);
 2630                 sin.sin_port = sh->src_port;
 2631                 sin.sin_addr.s_addr = cookie->address[0];
 2632                 to = (struct sockaddr *)&sin;
 2633                 break;
 2634 #endif
 2635         default:
 2636                 /* This should not happen */
 2637                 return (NULL);
 2638         }
 2639         if ((*stcb == NULL) && to) {
 2640                 /* Yep, lets check */
 2641                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
 2642                 if (*stcb == NULL) {
 2643                         /*
 2644                          * We should have only got back the same inp. If we
 2645                          * got back a different ep we have a problem. The
 2646                          * original findep got back l_inp and now
 2647                          */
 2648                         if (l_inp != *inp_p) {
 2649                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
 2650                         }
 2651                 } else {
 2652                         if (*locked_tcb == NULL) {
 2653                                 /*
 2654                                  * In this case we found the assoc only
 2655                                  * after we locked the create lock. This
 2656                                  * means we are in a colliding case and we
 2657                                  * must make sure that we unlock the tcb if
 2658                                  * its one of the cases where we throw away
 2659                                  * the incoming packets.
 2660                                  */
 2661                                 *locked_tcb = *stcb;
 2662 
 2663                                 /*
 2664                                  * We must also increment the inp ref count
 2665                                  * since the ref_count flags was set when we
 2666                                  * did not find the TCB, now we found it
 2667                                  * which reduces the refcount.. we must
 2668                                  * raise it back out to balance it all :-)
 2669                                  */
 2670                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
 2671                                 if ((*stcb)->sctp_ep != l_inp) {
 2672                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
 2673                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
 2674                                 }
 2675                         }
 2676                 }
 2677         }
 2678         if (to == NULL) {
 2679                 return (NULL);
 2680         }
 2681         cookie_len -= SCTP_SIGNATURE_SIZE;
 2682         if (*stcb == NULL) {
 2683                 /* this is the "normal" case... get a new TCB */
 2684                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
 2685                     cookie, cookie_len, *inp_p,
 2686                     netp, to, &notification,
 2687                     auth_skipped, auth_offset, auth_len,
 2688                     use_mflowid, mflowid,
 2689                     vrf_id, port);
 2690         } else {
 2691                 /* this is abnormal... cookie-echo on existing TCB */
 2692                 had_a_existing_tcb = 1;
 2693                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
 2694                     src, dst, sh,
 2695                     cookie, cookie_len, *inp_p, *stcb, netp, to,
 2696                     &notification, auth_skipped, auth_offset, auth_len,
 2697                     use_mflowid, mflowid,
 2698                     vrf_id, port);
 2699         }
 2700 
 2701         if (*stcb == NULL) {
 2702                 /* still no TCB... must be bad cookie-echo */
 2703                 return (NULL);
 2704         }
 2705         if ((*netp != NULL) && (use_mflowid != 0)) {
 2706                 (*netp)->flowid = mflowid;
 2707 #ifdef INVARIANTS
 2708                 (*netp)->flowidset = 1;
 2709 #endif
 2710         }
 2711         /*
 2712          * Ok, we built an association so confirm the address we sent the
 2713          * INIT-ACK to.
 2714          */
 2715         netl = sctp_findnet(*stcb, to);
 2716         /*
 2717          * This code should in theory NOT run but
 2718          */
 2719         if (netl == NULL) {
 2720                 /* TSNH! Huh, why do I need to add this address here? */
 2721                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
 2722                         return (NULL);
 2723                 }
 2724                 netl = sctp_findnet(*stcb, to);
 2725         }
 2726         if (netl) {
 2727                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
 2728                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 2729                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
 2730                             netl);
 2731                         send_int_conf = 1;
 2732                 }
 2733         }
 2734         sctp_start_net_timers(*stcb);
 2735         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 2736                 if (!had_a_existing_tcb ||
 2737                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 2738                         /*
 2739                          * If we have a NEW cookie or the connect never
 2740                          * reached the connected state during collision we
 2741                          * must do the TCP accept thing.
 2742                          */
 2743                         struct socket *so, *oso;
 2744                         struct sctp_inpcb *inp;
 2745 
 2746                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
 2747                                 /*
 2748                                  * For a restart we will keep the same
 2749                                  * socket, no need to do anything. I THINK!!
 2750                                  */
 2751                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2752                                 if (send_int_conf) {
 2753                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2754                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2755                                 }
 2756                                 return (m);
 2757                         }
 2758                         oso = (*inp_p)->sctp_socket;
 2759                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2760                         SCTP_TCB_UNLOCK((*stcb));
 2761                         CURVNET_SET(oso->so_vnet);
 2762                         so = sonewconn(oso, 0
 2763                             );
 2764                         CURVNET_RESTORE();
 2765                         SCTP_TCB_LOCK((*stcb));
 2766                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2767 
 2768                         if (so == NULL) {
 2769                                 struct mbuf *op_err;
 2770 
 2771 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2772                                 struct socket *pcb_so;
 2773 
 2774 #endif
 2775                                 /* Too many sockets */
 2776                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
 2777                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 2778                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
 2779                                     src, dst, sh, op_err,
 2780                                     use_mflowid, mflowid,
 2781                                     vrf_id, port);
 2782 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2783                                 pcb_so = SCTP_INP_SO(*inp_p);
 2784                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2785                                 SCTP_TCB_UNLOCK((*stcb));
 2786                                 SCTP_SOCKET_LOCK(pcb_so, 1);
 2787                                 SCTP_TCB_LOCK((*stcb));
 2788                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2789 #endif
 2790                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
 2791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2792                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
 2793 #endif
 2794                                 return (NULL);
 2795                         }
 2796                         inp = (struct sctp_inpcb *)so->so_pcb;
 2797                         SCTP_INP_INCR_REF(inp);
 2798                         /*
 2799                          * We add the unbound flag here so that if we get an
 2800                          * soabort() before we get the move_pcb done, we
 2801                          * will properly cleanup.
 2802                          */
 2803                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
 2804                             SCTP_PCB_FLAGS_CONNECTED |
 2805                             SCTP_PCB_FLAGS_IN_TCPPOOL |
 2806                             SCTP_PCB_FLAGS_UNBOUND |
 2807                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
 2808                             SCTP_PCB_FLAGS_DONT_WAKE);
 2809                         inp->sctp_features = (*inp_p)->sctp_features;
 2810                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
 2811                         inp->sctp_socket = so;
 2812                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
 2813                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
 2814                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
 2815                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
 2816                         inp->sctp_context = (*inp_p)->sctp_context;
 2817                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
 2818                         inp->inp_starting_point_for_iterator = NULL;
 2819                         /*
 2820                          * copy in the authentication parameters from the
 2821                          * original endpoint
 2822                          */
 2823                         if (inp->sctp_ep.local_hmacs)
 2824                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
 2825                         inp->sctp_ep.local_hmacs =
 2826                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
 2827                         if (inp->sctp_ep.local_auth_chunks)
 2828                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
 2829                         inp->sctp_ep.local_auth_chunks =
 2830                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
 2831 
 2832                         /*
 2833                          * Now we must move it from one hash table to
 2834                          * another and get the tcb in the right place.
 2835                          */
 2836 
 2837                         /*
 2838                          * This is where the one-2-one socket is put into
 2839                          * the accept state waiting for the accept!
 2840                          */
 2841                         if (*stcb) {
 2842                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
 2843                         }
 2844                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
 2845 
 2846                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2847                         SCTP_TCB_UNLOCK((*stcb));
 2848 
 2849                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
 2850                             0);
 2851                         SCTP_TCB_LOCK((*stcb));
 2852                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2853 
 2854 
 2855                         /*
 2856                          * now we must check to see if we were aborted while
 2857                          * the move was going on and the lock/unlock
 2858                          * happened.
 2859                          */
 2860                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 2861                                 /*
 2862                                  * yep it was, we leave the assoc attached
 2863                                  * to the socket since the sctp_inpcb_free()
 2864                                  * call will send an abort for us.
 2865                                  */
 2866                                 SCTP_INP_DECR_REF(inp);
 2867                                 return (NULL);
 2868                         }
 2869                         SCTP_INP_DECR_REF(inp);
 2870                         /* Switch over to the new guy */
 2871                         *inp_p = inp;
 2872                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2873                         if (send_int_conf) {
 2874                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2875                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2876                         }
 2877                         /*
 2878                          * Pull it from the incomplete queue and wake the
 2879                          * guy
 2880                          */
 2881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2882                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2883                         SCTP_TCB_UNLOCK((*stcb));
 2884                         SCTP_SOCKET_LOCK(so, 1);
 2885 #endif
 2886                         soisconnected(so);
 2887 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2888                         SCTP_TCB_LOCK((*stcb));
 2889                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2890                         SCTP_SOCKET_UNLOCK(so, 1);
 2891 #endif
 2892                         return (m);
 2893                 }
 2894         }
 2895         if (notification) {
 2896                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2897         }
 2898         if (send_int_conf) {
 2899                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2900                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2901         }
 2902         return (m);
 2903 }
 2904 
 2905 static void
 2906 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
 2907     struct sctp_tcb *stcb, struct sctp_nets *net)
 2908 {
 2909         /* cp must not be used, others call this without a c-ack :-) */
 2910         struct sctp_association *asoc;
 2911 
 2912         SCTPDBG(SCTP_DEBUG_INPUT2,
 2913             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
 2914         if (stcb == NULL)
 2915                 return;
 2916 
 2917         asoc = &stcb->asoc;
 2918 
 2919         sctp_stop_all_cookie_timers(stcb);
 2920         /* process according to association state */
 2921         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
 2922                 /* state change only needed when I am in right state */
 2923                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
 2924                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 2925                 sctp_start_net_timers(stcb);
 2926                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 2927                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 2928                             stcb->sctp_ep, stcb, asoc->primary_destination);
 2929 
 2930                 }
 2931                 /* update RTO */
 2932                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 2933                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 2934                 if (asoc->overall_error_count == 0) {
 2935                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
 2936                             &asoc->time_entered, sctp_align_safe_nocopy,
 2937                             SCTP_RTT_FROM_NON_DATA);
 2938                 }
 2939                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 2940                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2941                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 2942                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 2943 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2944                         struct socket *so;
 2945 
 2946 #endif
 2947                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 2948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2949                         so = SCTP_INP_SO(stcb->sctp_ep);
 2950                         atomic_add_int(&stcb->asoc.refcnt, 1);
 2951                         SCTP_TCB_UNLOCK(stcb);
 2952                         SCTP_SOCKET_LOCK(so, 1);
 2953                         SCTP_TCB_LOCK(stcb);
 2954                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2955 #endif
 2956                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
 2957                                 soisconnected(stcb->sctp_socket);
 2958                         }
 2959 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2960                         SCTP_SOCKET_UNLOCK(so, 1);
 2961 #endif
 2962                 }
 2963                 /*
 2964                  * since we did not send a HB make sure we don't double
 2965                  * things
 2966                  */
 2967                 net->hb_responded = 1;
 2968 
 2969                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 2970                         /*
 2971                          * We don't need to do the asconf thing, nor hb or
 2972                          * autoclose if the socket is closed.
 2973                          */
 2974                         goto closed_socket;
 2975                 }
 2976                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 2977                     stcb, net);
 2978 
 2979 
 2980                 if (stcb->asoc.sctp_autoclose_ticks &&
 2981                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 2982                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
 2983                             stcb->sctp_ep, stcb, NULL);
 2984                 }
 2985                 /*
 2986                  * send ASCONF if parameters are pending and ASCONFs are
 2987                  * allowed (eg. addresses changed when init/cookie echo were
 2988                  * in flight)
 2989                  */
 2990                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
 2991                     (stcb->asoc.peer_supports_asconf) &&
 2992                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
 2993 #ifdef SCTP_TIMER_BASED_ASCONF
 2994                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
 2995                             stcb->sctp_ep, stcb,
 2996                             stcb->asoc.primary_destination);
 2997 #else
 2998                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
 2999                             SCTP_ADDR_NOT_LOCKED);
 3000 #endif
 3001                 }
 3002         }
 3003 closed_socket:
 3004         /* Toss the cookie if I can */
 3005         sctp_toss_old_cookies(stcb, asoc);
 3006         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
 3007                 /* Restart the timer if we have pending data */
 3008                 struct sctp_tmit_chunk *chk;
 3009 
 3010                 chk = TAILQ_FIRST(&asoc->sent_queue);
 3011                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
 3012         }
 3013 }
 3014 
 3015 static void
 3016 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
 3017     struct sctp_tcb *stcb)
 3018 {
 3019         struct sctp_nets *net;
 3020         struct sctp_tmit_chunk *lchk;
 3021         struct sctp_ecne_chunk bkup;
 3022         uint8_t override_bit;
 3023         uint32_t tsn, window_data_tsn;
 3024         int len;
 3025         unsigned int pkt_cnt;
 3026 
 3027         len = ntohs(cp->ch.chunk_length);
 3028         if ((len != sizeof(struct sctp_ecne_chunk)) &&
 3029             (len != sizeof(struct old_sctp_ecne_chunk))) {
 3030                 return;
 3031         }
 3032         if (len == sizeof(struct old_sctp_ecne_chunk)) {
 3033                 /* Its the old format */
 3034                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
 3035                 bkup.num_pkts_since_cwr = htonl(1);
 3036                 cp = &bkup;
 3037         }
 3038         SCTP_STAT_INCR(sctps_recvecne);
 3039         tsn = ntohl(cp->tsn);
 3040         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
 3041         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
 3042         if (lchk == NULL) {
 3043                 window_data_tsn = stcb->asoc.sending_seq - 1;
 3044         } else {
 3045                 window_data_tsn = lchk->rec.data.TSN_seq;
 3046         }
 3047 
 3048         /* Find where it was sent to if possible. */
 3049         net = NULL;
 3050         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
 3051                 if (lchk->rec.data.TSN_seq == tsn) {
 3052                         net = lchk->whoTo;
 3053                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
 3054                         break;
 3055                 }
 3056                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
 3057                         break;
 3058                 }
 3059         }
 3060         if (net == NULL) {
 3061                 /*
 3062                  * What to do. A previous send of a CWR was possibly lost.
 3063                  * See how old it is, we may have it marked on the actual
 3064                  * net.
 3065                  */
 3066                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 3067                         if (tsn == net->last_cwr_tsn) {
 3068                                 /* Found him, send it off */
 3069                                 break;
 3070                         }
 3071                 }
 3072                 if (net == NULL) {
 3073                         /*
 3074                          * If we reach here, we need to send a special CWR
 3075                          * that says hey, we did this a long time ago and
 3076                          * you lost the response.
 3077                          */
 3078                         net = TAILQ_FIRST(&stcb->asoc.nets);
 3079                         if (net == NULL) {
 3080                                 /* TSNH */
 3081                                 return;
 3082                         }
 3083                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
 3084                 } else {
 3085                         override_bit = 0;
 3086                 }
 3087         } else {
 3088                 override_bit = 0;
 3089         }
 3090         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
 3091             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
 3092                 /*
 3093                  * JRS - Use the congestion control given in the pluggable
 3094                  * CC module
 3095                  */
 3096                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
 3097                 /*
 3098                  * We reduce once every RTT. So we will only lower cwnd at
 3099                  * the next sending seq i.e. the window_data_tsn
 3100                  */
 3101                 net->cwr_window_tsn = window_data_tsn;
 3102                 net->ecn_ce_pkt_cnt += pkt_cnt;
 3103                 net->lost_cnt = pkt_cnt;
 3104                 net->last_cwr_tsn = tsn;
 3105         } else {
 3106                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
 3107                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
 3108                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
 3109                         /*
 3110                          * Another loss in the same window update how many
 3111                          * marks/packets lost we have had.
 3112                          */
 3113                         int cnt = 1;
 3114 
 3115                         if (pkt_cnt > net->lost_cnt) {
 3116                                 /* Should be the case */
 3117                                 cnt = (pkt_cnt - net->lost_cnt);
 3118                                 net->ecn_ce_pkt_cnt += cnt;
 3119                         }
 3120                         net->lost_cnt = pkt_cnt;
 3121                         net->last_cwr_tsn = tsn;
 3122                         /*
 3123                          * Most CC functions will ignore this call, since we
 3124                          * are in-window yet of the initial CE the peer saw.
 3125                          */
 3126                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
 3127                 }
 3128         }
 3129         /*
 3130          * We always send a CWR this way if our previous one was lost our
 3131          * peer will get an update, or if it is not time again to reduce we
 3132          * still get the cwr to the peer. Note we set the override when we
 3133          * could not find the TSN on the chunk or the destination network.
 3134          */
 3135         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
 3136 }
 3137 
 3138 static void
 3139 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
 3140 {
 3141         /*
 3142          * Here we get a CWR from the peer. We must look in the outqueue and
 3143          * make sure that we have a covered ECNE in the control chunk part.
 3144          * If so remove it.
 3145          */
 3146         struct sctp_tmit_chunk *chk;
 3147         struct sctp_ecne_chunk *ecne;
 3148         int override;
 3149         uint32_t cwr_tsn;
 3150 
 3151         cwr_tsn = ntohl(cp->tsn);
 3152 
 3153         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
 3154         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 3155                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
 3156                         continue;
 3157                 }
 3158                 if ((override == 0) && (chk->whoTo != net)) {
 3159                         /* Must be from the right src unless override is set */
 3160                         continue;
 3161                 }
 3162                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
 3163                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
 3164                         /* this covers this ECNE, we can remove it */
 3165                         stcb->asoc.ecn_echo_cnt_onq--;
 3166                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
 3167                             sctp_next);
 3168                         if (chk->data) {
 3169                                 sctp_m_freem(chk->data);
 3170                                 chk->data = NULL;
 3171                         }
 3172                         stcb->asoc.ctrl_queue_cnt--;
 3173                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 3174                         if (override == 0) {
 3175                                 break;
 3176                         }
 3177                 }
 3178         }
 3179 }
 3180 
 3181 static void
 3182 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
 3183     struct sctp_tcb *stcb, struct sctp_nets *net)
 3184 {
 3185         struct sctp_association *asoc;
 3186 
 3187 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3188         struct socket *so;
 3189 
 3190 #endif
 3191 
 3192         SCTPDBG(SCTP_DEBUG_INPUT2,
 3193             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
 3194         if (stcb == NULL)
 3195                 return;
 3196 
 3197         asoc = &stcb->asoc;
 3198         /* process according to association state */
 3199         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 3200                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
 3201                 SCTPDBG(SCTP_DEBUG_INPUT2,
 3202                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
 3203                 SCTP_TCB_UNLOCK(stcb);
 3204                 return;
 3205         }
 3206         /* notify upper layer protocol */
 3207         if (stcb->sctp_socket) {
 3208                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 3209         }
 3210 #ifdef INVARIANTS
 3211         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 3212             !TAILQ_EMPTY(&asoc->sent_queue) ||
 3213             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 3214                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
 3215         }
 3216 #endif
 3217         /* stop the timer */
 3218         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
 3219         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 3220         /* free the TCB */
 3221         SCTPDBG(SCTP_DEBUG_INPUT2,
 3222             "sctp_handle_shutdown_complete: calls free-asoc\n");
 3223 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3224         so = SCTP_INP_SO(stcb->sctp_ep);
 3225         atomic_add_int(&stcb->asoc.refcnt, 1);
 3226         SCTP_TCB_UNLOCK(stcb);
 3227         SCTP_SOCKET_LOCK(so, 1);
 3228         SCTP_TCB_LOCK(stcb);
 3229         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 3230 #endif
 3231         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
 3232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3233         SCTP_SOCKET_UNLOCK(so, 1);
 3234 #endif
 3235         return;
 3236 }
 3237 
 3238 static int
 3239 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
 3240     struct sctp_nets *net, uint8_t flg)
 3241 {
 3242         switch (desc->chunk_type) {
 3243         case SCTP_DATA:
 3244                 /* find the tsn to resend (possibly */
 3245                 {
 3246                         uint32_t tsn;
 3247                         struct sctp_tmit_chunk *tp1;
 3248 
 3249                         tsn = ntohl(desc->tsn_ifany);
 3250                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3251                                 if (tp1->rec.data.TSN_seq == tsn) {
 3252                                         /* found it */
 3253                                         break;
 3254                                 }
 3255                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
 3256                                         /* not found */
 3257                                         tp1 = NULL;
 3258                                         break;
 3259                                 }
 3260                         }
 3261                         if (tp1 == NULL) {
 3262                                 /*
 3263                                  * Do it the other way , aka without paying
 3264                                  * attention to queue seq order.
 3265                                  */
 3266                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
 3267                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3268                                         if (tp1->rec.data.TSN_seq == tsn) {
 3269                                                 /* found it */
 3270                                                 break;
 3271                                         }
 3272                                 }
 3273                         }
 3274                         if (tp1 == NULL) {
 3275                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
 3276                         }
 3277                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
 3278                                 uint8_t *ddp;
 3279 
 3280                                 if (((flg & SCTP_BADCRC) == 0) &&
 3281                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
 3282                                         return (0);
 3283                                 }
 3284                                 if ((stcb->asoc.peers_rwnd == 0) &&
 3285                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
 3286                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
 3287                                         return (0);
 3288                                 }
 3289                                 if (stcb->asoc.peers_rwnd == 0 &&
 3290                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
 3291                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
 3292                                         return (0);
 3293                                 }
 3294                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
 3295                                     sizeof(struct sctp_data_chunk));
 3296                                 {
 3297                                         unsigned int iii;
 3298 
 3299                                         for (iii = 0; iii < sizeof(desc->data_bytes);
 3300                                             iii++) {
 3301                                                 if (ddp[iii] != desc->data_bytes[iii]) {
 3302                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
 3303                                                         return (-1);
 3304                                                 }
 3305                                         }
 3306                                 }
 3307 
 3308                                 if (tp1->do_rtt) {
 3309                                         /*
 3310                                          * this guy had a RTO calculation
 3311                                          * pending on it, cancel it
 3312                                          */
 3313                                         if (tp1->whoTo->rto_needed == 0) {
 3314                                                 tp1->whoTo->rto_needed = 1;
 3315                                         }
 3316                                         tp1->do_rtt = 0;
 3317                                 }
 3318                                 SCTP_STAT_INCR(sctps_pdrpmark);
 3319                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
 3320                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3321                                 /*
 3322                                  * mark it as if we were doing a FR, since
 3323                                  * we will be getting gap ack reports behind
 3324                                  * the info from the router.
 3325                                  */
 3326                                 tp1->rec.data.doing_fast_retransmit = 1;
 3327                                 /*
 3328                                  * mark the tsn with what sequences can
 3329                                  * cause a new FR.
 3330                                  */
 3331                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 3332                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 3333                                 } else {
 3334                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
 3335                                 }
 3336 
 3337                                 /* restart the timer */
 3338                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 3339                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
 3340                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 3341                                     stcb, tp1->whoTo);
 3342 
 3343                                 /* fix counts and things */
 3344                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 3345                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
 3346                                             tp1->whoTo->flight_size,
 3347                                             tp1->book_size,
 3348                                             (uintptr_t) stcb,
 3349                                             tp1->rec.data.TSN_seq);
 3350                                 }
 3351                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 3352                                         sctp_flight_size_decrease(tp1);
 3353                                         sctp_total_flight_decrease(stcb, tp1);
 3354                                 }
 3355                                 tp1->sent = SCTP_DATAGRAM_RESEND;
 3356                         } {
 3357                                 /* audit code */
 3358                                 unsigned int audit;
 3359 
 3360                                 audit = 0;
 3361                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3362                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
 3363                                                 audit++;
 3364                                 }
 3365                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
 3366                                     sctp_next) {
 3367                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
 3368                                                 audit++;
 3369                                 }
 3370                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
 3371                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
 3372                                             audit, stcb->asoc.sent_queue_retran_cnt);
 3373 #ifndef SCTP_AUDITING_ENABLED
 3374                                         stcb->asoc.sent_queue_retran_cnt = audit;
 3375 #endif
 3376                                 }
 3377                         }
 3378                 }
 3379                 break;
 3380         case SCTP_ASCONF:
 3381                 {
 3382                         struct sctp_tmit_chunk *asconf;
 3383 
 3384                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
 3385                             sctp_next) {
 3386                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
 3387                                         break;
 3388                                 }
 3389                         }
 3390                         if (asconf) {
 3391                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 3392                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3393                                 asconf->sent = SCTP_DATAGRAM_RESEND;
 3394                                 asconf->snd_count--;
 3395                         }
 3396                 }
 3397                 break;
 3398         case SCTP_INITIATION:
 3399                 /* resend the INIT */
 3400                 stcb->asoc.dropped_special_cnt++;
 3401                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
 3402                         /*
 3403                          * If we can get it in, in a few attempts we do
 3404                          * this, otherwise we let the timer fire.
 3405                          */
 3406                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
 3407                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
 3408                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 3409                 }
 3410                 break;
 3411         case SCTP_SELECTIVE_ACK:
 3412         case SCTP_NR_SELECTIVE_ACK:
 3413                 /* resend the sack */
 3414                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
 3415                 break;
 3416         case SCTP_HEARTBEAT_REQUEST:
 3417                 /* resend a demand HB */
 3418                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
 3419                         /*
 3420                          * Only retransmit if we KNOW we wont destroy the
 3421                          * tcb
 3422                          */
 3423                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 3424                 }
 3425                 break;
 3426         case SCTP_SHUTDOWN:
 3427                 sctp_send_shutdown(stcb, net);
 3428                 break;
 3429         case SCTP_SHUTDOWN_ACK:
 3430                 sctp_send_shutdown_ack(stcb, net);
 3431                 break;
 3432         case SCTP_COOKIE_ECHO:
 3433                 {
 3434                         struct sctp_tmit_chunk *cookie;
 3435 
 3436                         cookie = NULL;
 3437                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
 3438                             sctp_next) {
 3439                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 3440                                         break;
 3441                                 }
 3442                         }
 3443                         if (cookie) {
 3444                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
 3445                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3446                                 cookie->sent = SCTP_DATAGRAM_RESEND;
 3447                                 sctp_stop_all_cookie_timers(stcb);
 3448                         }
 3449                 }
 3450                 break;
 3451         case SCTP_COOKIE_ACK:
 3452                 sctp_send_cookie_ack(stcb);
 3453                 break;
 3454         case SCTP_ASCONF_ACK:
 3455                 /* resend last asconf ack */
 3456                 sctp_send_asconf_ack(stcb);
 3457                 break;
 3458         case SCTP_FORWARD_CUM_TSN:
 3459                 send_forward_tsn(stcb, &stcb->asoc);
 3460                 break;
 3461                 /* can't do anything with these */
 3462         case SCTP_PACKET_DROPPED:
 3463         case SCTP_INITIATION_ACK:       /* this should not happen */
 3464         case SCTP_HEARTBEAT_ACK:
 3465         case SCTP_ABORT_ASSOCIATION:
 3466         case SCTP_OPERATION_ERROR:
 3467         case SCTP_SHUTDOWN_COMPLETE:
 3468         case SCTP_ECN_ECHO:
 3469         case SCTP_ECN_CWR:
 3470         default:
 3471                 break;
 3472         }
 3473         return (0);
 3474 }
 3475 
 3476 void
 3477 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
 3478 {
 3479         uint32_t i;
 3480         uint16_t temp;
 3481 
 3482         /*
 3483          * We set things to 0xffff since this is the last delivered sequence
 3484          * and we will be sending in 0 after the reset.
 3485          */
 3486 
 3487         if (number_entries) {
 3488                 for (i = 0; i < number_entries; i++) {
 3489                         temp = ntohs(list[i]);
 3490                         if (temp >= stcb->asoc.streamincnt) {
 3491                                 continue;
 3492                         }
 3493                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
 3494                 }
 3495         } else {
 3496                 list = NULL;
 3497                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
 3498                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
 3499                 }
 3500         }
 3501         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
 3502 }
 3503 
 3504 static void
 3505 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
 3506 {
 3507         uint32_t i;
 3508         uint16_t temp;
 3509 
 3510         if (number_entries > 0) {
 3511                 for (i = 0; i < number_entries; i++) {
 3512                         temp = ntohs(list[i]);
 3513                         if (temp >= stcb->asoc.streamoutcnt) {
 3514                                 /* no such stream */
 3515                                 continue;
 3516                         }
 3517                         stcb->asoc.strmout[temp].next_sequence_send = 0;
 3518                 }
 3519         } else {
 3520                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3521                         stcb->asoc.strmout[i].next_sequence_send = 0;
 3522                 }
 3523         }
 3524         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
 3525 }
 3526 
 3527 
 3528 struct sctp_stream_reset_out_request *
 3529 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
 3530 {
 3531         struct sctp_association *asoc;
 3532         struct sctp_chunkhdr *ch;
 3533         struct sctp_stream_reset_out_request *r;
 3534         struct sctp_tmit_chunk *chk;
 3535         int len, clen;
 3536 
 3537         asoc = &stcb->asoc;
 3538         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
 3539                 asoc->stream_reset_outstanding = 0;
 3540                 return (NULL);
 3541         }
 3542         if (stcb->asoc.str_reset == NULL) {
 3543                 asoc->stream_reset_outstanding = 0;
 3544                 return (NULL);
 3545         }
 3546         chk = stcb->asoc.str_reset;
 3547         if (chk->data == NULL) {
 3548                 return (NULL);
 3549         }
 3550         if (bchk) {
 3551                 /* he wants a copy of the chk pointer */
 3552                 *bchk = chk;
 3553         }
 3554         clen = chk->send_size;
 3555         ch = mtod(chk->data, struct sctp_chunkhdr *);
 3556         r = (struct sctp_stream_reset_out_request *)(ch + 1);
 3557         if (ntohl(r->request_seq) == seq) {
 3558                 /* found it */
 3559                 return (r);
 3560         }
 3561         len = SCTP_SIZE32(ntohs(r->ph.param_length));
 3562         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
 3563                 /* move to the next one, there can only be a max of two */
 3564                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
 3565                 if (ntohl(r->request_seq) == seq) {
 3566                         return (r);
 3567                 }
 3568         }
 3569         /* that seq is not here */
 3570         return (NULL);
 3571 }
 3572 
 3573 static void
 3574 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
 3575 {
 3576         struct sctp_association *asoc;
 3577         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
 3578 
 3579         if (stcb->asoc.str_reset == NULL) {
 3580                 return;
 3581         }
 3582         asoc = &stcb->asoc;
 3583 
 3584         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
 3585         TAILQ_REMOVE(&asoc->control_send_queue,
 3586             chk,
 3587             sctp_next);
 3588         if (chk->data) {
 3589                 sctp_m_freem(chk->data);
 3590                 chk->data = NULL;
 3591         }
 3592         asoc->ctrl_queue_cnt--;
 3593         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 3594         /* sa_ignore NO_NULL_CHK */
 3595         stcb->asoc.str_reset = NULL;
 3596 }
 3597 
 3598 
 3599 static int
 3600 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
 3601     uint32_t seq, uint32_t action,
 3602     struct sctp_stream_reset_response *respin)
 3603 {
 3604         uint16_t type;
 3605         int lparm_len;
 3606         struct sctp_association *asoc = &stcb->asoc;
 3607         struct sctp_tmit_chunk *chk;
 3608         struct sctp_stream_reset_out_request *srparam;
 3609         uint32_t number_entries;
 3610 
 3611         if (asoc->stream_reset_outstanding == 0) {
 3612                 /* duplicate */
 3613                 return (0);
 3614         }
 3615         if (seq == stcb->asoc.str_reset_seq_out) {
 3616                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
 3617                 if (srparam) {
 3618                         stcb->asoc.str_reset_seq_out++;
 3619                         type = ntohs(srparam->ph.param_type);
 3620                         lparm_len = ntohs(srparam->ph.param_length);
 3621                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
 3622                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
 3623                                 asoc->stream_reset_out_is_outstanding = 0;
 3624                                 if (asoc->stream_reset_outstanding)
 3625                                         asoc->stream_reset_outstanding--;
 3626                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3627                                         /* do it */
 3628                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
 3629                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3630                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
 3631                                 } else {
 3632                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
 3633                                 }
 3634                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
 3635                                 /* Answered my request */
 3636                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
 3637                                 if (asoc->stream_reset_outstanding)
 3638                                         asoc->stream_reset_outstanding--;
 3639                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3640                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
 3641                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
 3642                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3643                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
 3644                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
 3645                                 }
 3646                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
 3647                                 /* Ok we now may have more streams */
 3648                                 int num_stream;
 3649 
 3650                                 num_stream = stcb->asoc.strm_pending_add_size;
 3651                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
 3652                                         /* TSNH */
 3653                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
 3654                                 }
 3655                                 stcb->asoc.strm_pending_add_size = 0;
 3656                                 if (asoc->stream_reset_outstanding)
 3657                                         asoc->stream_reset_outstanding--;
 3658                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3659                                         /* Put the new streams into effect */
 3660                                         stcb->asoc.streamoutcnt += num_stream;
 3661                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
 3662                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3663                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3664                                             SCTP_STREAM_CHANGE_DENIED);
 3665                                 } else {
 3666                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3667                                             SCTP_STREAM_CHANGE_FAILED);
 3668                                 }
 3669                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
 3670                                 if (asoc->stream_reset_outstanding)
 3671                                         asoc->stream_reset_outstanding--;
 3672                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3673                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3674                                             SCTP_STREAM_CHANGE_DENIED);
 3675                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3676                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3677                                             SCTP_STREAM_CHANGE_FAILED);
 3678                                 }
 3679                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
 3680                                 /**
 3681                                  * a) Adopt the new in tsn.
 3682                                  * b) reset the map
 3683                                  * c) Adopt the new out-tsn
 3684                                  */
 3685                                 struct sctp_stream_reset_response_tsn *resp;
 3686                                 struct sctp_forward_tsn_chunk fwdtsn;
 3687                                 int abort_flag = 0;
 3688 
 3689                                 if (respin == NULL) {
 3690                                         /* huh ? */
 3691                                         return (0);
 3692                                 }
 3693                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
 3694                                         return (0);
 3695                                 }
 3696                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3697                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
 3698                                         asoc->stream_reset_outstanding--;
 3699                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
 3700                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 3701                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
 3702                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
 3703                                         if (abort_flag) {
 3704                                                 return (1);
 3705                                         }
 3706                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
 3707                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 3708                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 3709                                         }
 3710                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
 3711                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
 3712                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
 3713 
 3714                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
 3715                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
 3716 
 3717                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
 3718                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
 3719 
 3720                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
 3721                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
 3722                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
 3723                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3724                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
 3725                                             SCTP_ASSOC_RESET_DENIED);
 3726                                 } else {
 3727                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
 3728                                             SCTP_ASSOC_RESET_FAILED);
 3729                                 }
 3730                         }
 3731                         /* get rid of the request and get the request flags */
 3732                         if (asoc->stream_reset_outstanding == 0) {
 3733                                 sctp_clean_up_stream_reset(stcb);
 3734                         }
 3735                 }
 3736         }
 3737         return (0);
 3738 }
 3739 
 3740 static void
 3741 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
 3742     struct sctp_tmit_chunk *chk,
 3743     struct sctp_stream_reset_in_request *req, int trunc)
 3744 {
 3745         uint32_t seq;
 3746         int len, i;
 3747         int number_entries;
 3748         uint16_t temp;
 3749 
 3750         /*
 3751          * peer wants me to send a str-reset to him for my outgoing seq's if
 3752          * seq_in is right.
 3753          */
 3754         struct sctp_association *asoc = &stcb->asoc;
 3755 
 3756         seq = ntohl(req->request_seq);
 3757         if (asoc->str_reset_seq_in == seq) {
 3758                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3759                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
 3760                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3761                 } else if (trunc) {
 3762                         /* Can't do it, since they exceeded our buffer size  */
 3763                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3764                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
 3765                         len = ntohs(req->ph.param_length);
 3766                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
 3767                         for (i = 0; i < number_entries; i++) {
 3768                                 temp = ntohs(req->list_of_streams[i]);
 3769                                 req->list_of_streams[i] = temp;
 3770                         }
 3771                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3772                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
 3773                             asoc->str_reset_seq_out,
 3774                             seq, (asoc->sending_seq - 1));
 3775                         asoc->stream_reset_out_is_outstanding = 1;
 3776                         asoc->str_reset = chk;
 3777                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
 3778                         stcb->asoc.stream_reset_outstanding++;
 3779                 } else {
 3780                         /* Can't do it, since we have sent one out */
 3781                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
 3782                 }
 3783                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3784                 asoc->str_reset_seq_in++;
 3785         } else if (asoc->str_reset_seq_in - 1 == seq) {
 3786                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3787         } else if (asoc->str_reset_seq_in - 2 == seq) {
 3788                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 3789         } else {
 3790                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 3791         }
 3792 }
 3793 
 3794 static int
 3795 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
 3796     struct sctp_tmit_chunk *chk,
 3797     struct sctp_stream_reset_tsn_request *req)
 3798 {
 3799         /* reset all in and out and update the tsn */
 3800         /*
 3801          * A) reset my str-seq's on in and out. B) Select a receive next,
 3802          * and set cum-ack to it. Also process this selected number as a
 3803          * fwd-tsn as well. C) set in the response my next sending seq.
 3804          */
 3805         struct sctp_forward_tsn_chunk fwdtsn;
 3806         struct sctp_association *asoc = &stcb->asoc;
 3807         int abort_flag = 0;
 3808         uint32_t seq;
 3809 
 3810         seq = ntohl(req->request_seq);
 3811         if (asoc->str_reset_seq_in == seq) {
 3812                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
 3813                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 3814                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3815                 } else {
 3816                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
 3817                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 3818                         fwdtsn.ch.chunk_flags = 0;
 3819                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
 3820                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
 3821                         if (abort_flag) {
 3822                                 return (1);
 3823                         }
 3824                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
 3825                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 3826                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 3827                         }
 3828                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
 3829                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
 3830                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
 3831                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 3832                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
 3833                         atomic_add_int(&asoc->sending_seq, 1);
 3834                         /* save off historical data for retrans */
 3835                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
 3836                         asoc->last_sending_seq[0] = asoc->sending_seq;
 3837                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
 3838                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
 3839                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
 3840                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
 3841                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3842                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
 3843                 }
 3844                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
 3845                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
 3846                 asoc->str_reset_seq_in++;
 3847         } else if (asoc->str_reset_seq_in - 1 == seq) {
 3848                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
 3849                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
 3850         } else if (asoc->str_reset_seq_in - 2 == seq) {
 3851                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
 3852                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
 3853         } else {
 3854                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 3855         }
 3856         return (0);
 3857 }
 3858 
 3859 static void
 3860 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
 3861     struct sctp_tmit_chunk *chk,
 3862     struct sctp_stream_reset_out_request *req, int trunc)
 3863 {
 3864         uint32_t seq, tsn;
 3865         int number_entries, len;
 3866         struct sctp_association *asoc = &stcb->asoc;
 3867 
 3868         seq = ntohl(req->request_seq);
 3869 
 3870         /* now if its not a duplicate we process it */
 3871         if (asoc->str_reset_seq_in == seq) {
 3872                 len = ntohs(req->ph.param_length);
 3873                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
 3874                 /*
 3875                  * the sender is resetting, handle the list issue.. we must
 3876                  * a) verify if we can do the reset, if so no problem b) If
 3877                  * we can't do the reset we must copy the request. c) queue
 3878                  * it, and setup the data in processor to trigger it off
 3879                  * when needed and dequeue all the queued data.
 3880                  */
 3881                 tsn = ntohl(req->send_reset_at_tsn);
 3882 
 3883                 /* move the reset action back one */
 3884                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3885                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
 3886                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3887                 } else if (trunc) {
 3888                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3889                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
 3890                         /* we can do it now */
 3891                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
 3892                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3893                 } else {
 3894                         /*
 3895                          * we must queue it up and thus wait for the TSN's
 3896                          * to arrive that are at or before tsn
 3897                          */
 3898                         struct sctp_stream_reset_list *liste;
 3899                         int siz;
 3900 
 3901                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
 3902                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
 3903                             siz, SCTP_M_STRESET);
 3904                         if (liste == NULL) {
 3905                                 /* gak out of memory */
 3906                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3907                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3908                                 return;
 3909                         }
 3910                         liste->tsn = tsn;
 3911                         liste->number_entries = number_entries;
 3912                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
 3913                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
 3914                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3915                 }
 3916                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3917                 asoc->str_reset_seq_in++;
 3918         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 3919                 /*
 3920                  * one seq back, just echo back last action since my
 3921                  * response was lost.
 3922                  */
 3923                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3924         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 3925                 /*
 3926                  * two seq back, just echo back last action since my
 3927                  * response was lost.
 3928                  */
 3929                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 3930         } else {
 3931                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 3932         }
 3933 }
 3934 
 3935 static void
 3936 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
 3937     struct sctp_stream_reset_add_strm *str_add)
 3938 {
 3939         /*
 3940          * Peer is requesting to add more streams. If its within our
 3941          * max-streams we will allow it.
 3942          */
 3943         uint32_t num_stream, i;
 3944         uint32_t seq;
 3945         struct sctp_association *asoc = &stcb->asoc;
 3946         struct sctp_queued_to_read *ctl, *nctl;
 3947 
 3948         /* Get the number. */
 3949         seq = ntohl(str_add->request_seq);
 3950         num_stream = ntohs(str_add->number_of_streams);
 3951         /* Now what would be the new total? */
 3952         if (asoc->str_reset_seq_in == seq) {
 3953                 num_stream += stcb->asoc.streamincnt;
 3954                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
 3955                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 3956                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3957                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
 3958                     (num_stream > 0xffff)) {
 3959                         /* We must reject it they ask for to many */
 3960         denied:
 3961                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3962                 } else {
 3963                         /* Ok, we can do that :-) */
 3964                         struct sctp_stream_in *oldstrm;
 3965 
 3966                         /* save off the old */
 3967                         oldstrm = stcb->asoc.strmin;
 3968                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
 3969                             (num_stream * sizeof(struct sctp_stream_in)),
 3970                             SCTP_M_STRMI);
 3971                         if (stcb->asoc.strmin == NULL) {
 3972                                 stcb->asoc.strmin = oldstrm;
 3973                                 goto denied;
 3974                         }
 3975                         /* copy off the old data */
 3976                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
 3977                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
 3978                                 stcb->asoc.strmin[i].stream_no = i;
 3979                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
 3980                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
 3981                                 /* now anything on those queues? */
 3982                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
 3983                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
 3984                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
 3985                                 }
 3986                         }
 3987                         /* Init the new streams */
 3988                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
 3989                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
 3990                                 stcb->asoc.strmin[i].stream_no = i;
 3991                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
 3992                                 stcb->asoc.strmin[i].delivery_started = 0;
 3993                         }
 3994                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
 3995                         /* update the size */
 3996                         stcb->asoc.streamincnt = num_stream;
 3997                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3998                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
 3999                 }
 4000                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4001                 asoc->str_reset_seq_in++;
 4002         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 4003                 /*
 4004                  * one seq back, just echo back last action since my
 4005                  * response was lost.
 4006                  */
 4007                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4008         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 4009                 /*
 4010                  * two seq back, just echo back last action since my
 4011                  * response was lost.
 4012                  */
 4013                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 4014         } else {
 4015                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 4016 
 4017         }
 4018 }
 4019 
 4020 static void
 4021 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
 4022     struct sctp_stream_reset_add_strm *str_add)
 4023 {
 4024         /*
 4025          * Peer is requesting to add more streams. If its within our
 4026          * max-streams we will allow it.
 4027          */
 4028         uint16_t num_stream;
 4029         uint32_t seq;
 4030         struct sctp_association *asoc = &stcb->asoc;
 4031 
 4032         /* Get the number. */
 4033         seq = ntohl(str_add->request_seq);
 4034         num_stream = ntohs(str_add->number_of_streams);
 4035         /* Now what would be the new total? */
 4036         if (asoc->str_reset_seq_in == seq) {
 4037                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
 4038                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 4039                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4040                 } else if (stcb->asoc.stream_reset_outstanding) {
 4041                         /* We must reject it we have something pending */
 4042                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
 4043                 } else {
 4044                         /* Ok, we can do that :-) */
 4045                         int mychk;
 4046 
 4047                         mychk = stcb->asoc.streamoutcnt;
 4048                         mychk += num_stream;
 4049                         if (mychk < 0x10000) {
 4050                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 4051                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
 4052                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4053                                 }
 4054                         } else {
 4055                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4056                         }
 4057                 }
 4058                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
 4059                 asoc->str_reset_seq_in++;
 4060         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 4061                 /*
 4062                  * one seq back, just echo back last action since my
 4063                  * response was lost.
 4064                  */
 4065                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4066         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 4067                 /*
 4068                  * two seq back, just echo back last action since my
 4069                  * response was lost.
 4070                  */
 4071                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 4072         } else {
 4073                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 4074         }
 4075 }
 4076 
 4077 #ifdef __GNUC__
 4078 __attribute__((noinline))
 4079 #endif
 4080         static int
 4081             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
 4082         struct sctp_chunkhdr *ch_req)
 4083 {
 4084         uint16_t remaining_length, param_len, ptype;
 4085         struct sctp_paramhdr pstore;
 4086         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
 4087         uint32_t seq = 0;
 4088         int num_req = 0;
 4089         int trunc = 0;
 4090         struct sctp_tmit_chunk *chk;
 4091         struct sctp_chunkhdr *ch;
 4092         struct sctp_paramhdr *ph;
 4093         int ret_code = 0;
 4094         int num_param = 0;
 4095 
 4096         /* now it may be a reset or a reset-response */
 4097         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
 4098 
 4099         /* setup for adding the response */
 4100         sctp_alloc_a_chunk(stcb, chk);
 4101         if (chk == NULL) {
 4102                 return (ret_code);
 4103         }
 4104         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
 4105         chk->rec.chunk_id.can_take_data = 0;
 4106         chk->asoc = &stcb->asoc;
 4107         chk->no_fr_allowed = 0;
 4108         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
 4109         chk->book_size_scale = 0;
 4110         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
 4111         if (chk->data == NULL) {
 4112 strres_nochunk:
 4113                 if (chk->data) {
 4114                         sctp_m_freem(chk->data);
 4115                         chk->data = NULL;
 4116                 }
 4117                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 4118                 return (ret_code);
 4119         }
 4120         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
 4121 
 4122         /* setup chunk parameters */
 4123         chk->sent = SCTP_DATAGRAM_UNSENT;
 4124         chk->snd_count = 0;
 4125         chk->whoTo = NULL;
 4126 
 4127         ch = mtod(chk->data, struct sctp_chunkhdr *);
 4128         ch->chunk_type = SCTP_STREAM_RESET;
 4129         ch->chunk_flags = 0;
 4130         ch->chunk_length = htons(chk->send_size);
 4131         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
 4132         offset += sizeof(struct sctp_chunkhdr);
 4133         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
 4134                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
 4135                 if (ph == NULL) {
 4136                         /* TSNH */
 4137                         break;
 4138                 }
 4139                 param_len = ntohs(ph->param_length);
 4140                 if ((param_len > remaining_length) ||
 4141                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
 4142                         /* bad parameter length */
 4143                         break;
 4144                 }
 4145                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
 4146                     (uint8_t *) & cstore);
 4147                 if (ph == NULL) {
 4148                         /* TSNH */
 4149                         break;
 4150                 }
 4151                 ptype = ntohs(ph->param_type);
 4152                 num_param++;
 4153                 if (param_len > sizeof(cstore)) {
 4154                         trunc = 1;
 4155                 } else {
 4156                         trunc = 0;
 4157                 }
 4158                 if (num_param > SCTP_MAX_RESET_PARAMS) {
 4159                         /* hit the max of parameters already sorry.. */
 4160                         break;
 4161                 }
 4162                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
 4163                         struct sctp_stream_reset_out_request *req_out;
 4164 
 4165                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
 4166                                 break;
 4167                         }
 4168                         req_out = (struct sctp_stream_reset_out_request *)ph;
 4169                         num_req++;
 4170                         if (stcb->asoc.stream_reset_outstanding) {
 4171                                 seq = ntohl(req_out->response_seq);
 4172                                 if (seq == stcb->asoc.str_reset_seq_out) {
 4173                                         /* implicit ack */
 4174                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
 4175                                 }
 4176                         }
 4177                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
 4178                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
 4179                         struct sctp_stream_reset_add_strm *str_add;
 4180 
 4181                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
 4182                                 break;
 4183                         }
 4184                         str_add = (struct sctp_stream_reset_add_strm *)ph;
 4185                         num_req++;
 4186                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
 4187                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
 4188                         struct sctp_stream_reset_add_strm *str_add;
 4189 
 4190                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
 4191                                 break;
 4192                         }
 4193                         str_add = (struct sctp_stream_reset_add_strm *)ph;
 4194                         num_req++;
 4195                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
 4196                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
 4197                         struct sctp_stream_reset_in_request *req_in;
 4198 
 4199                         num_req++;
 4200                         req_in = (struct sctp_stream_reset_in_request *)ph;
 4201                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
 4202                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
 4203                         struct sctp_stream_reset_tsn_request *req_tsn;
 4204 
 4205                         num_req++;
 4206                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
 4207                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
 4208                                 ret_code = 1;
 4209                                 goto strres_nochunk;
 4210                         }
 4211                         /* no more */
 4212                         break;
 4213                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
 4214                         struct sctp_stream_reset_response *resp;
 4215                         uint32_t result;
 4216 
 4217                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
 4218                                 break;
 4219                         }
 4220                         resp = (struct sctp_stream_reset_response *)ph;
 4221                         seq = ntohl(resp->response_seq);
 4222                         result = ntohl(resp->result);
 4223                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
 4224                                 ret_code = 1;
 4225                                 goto strres_nochunk;
 4226                         }
 4227                 } else {
 4228                         break;
 4229                 }
 4230                 offset += SCTP_SIZE32(param_len);
 4231                 if (remaining_length >= SCTP_SIZE32(param_len)) {
 4232                         remaining_length -= SCTP_SIZE32(param_len);
 4233                 } else {
 4234                         remaining_length = 0;
 4235                 }
 4236         }
 4237         if (num_req == 0) {
 4238                 /* we have no response free the stuff */
 4239                 goto strres_nochunk;
 4240         }
 4241         /* ok we have a chunk to link in */
 4242         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
 4243             chk,
 4244             sctp_next);
 4245         stcb->asoc.ctrl_queue_cnt++;
 4246         return (ret_code);
 4247 }
 4248 
 4249 /*
 4250  * Handle a router or endpoints report of a packet loss, there are two ways
 4251  * to handle this, either we get the whole packet and must disect it
 4252  * ourselves (possibly with truncation and or corruption) or it is a summary
 4253  * from a middle box that did the disectting for us.
 4254  */
 4255 static void
 4256 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
 4257     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
 4258 {
 4259         uint32_t bottle_bw, on_queue;
 4260         uint16_t trunc_len;
 4261         unsigned int chlen;
 4262         unsigned int at;
 4263         struct sctp_chunk_desc desc;
 4264         struct sctp_chunkhdr *ch;
 4265 
 4266         chlen = ntohs(cp->ch.chunk_length);
 4267         chlen -= sizeof(struct sctp_pktdrop_chunk);
 4268         /* XXX possible chlen underflow */
 4269         if (chlen == 0) {
 4270                 ch = NULL;
 4271                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
 4272                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
 4273         } else {
 4274                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
 4275                 chlen -= sizeof(struct sctphdr);
 4276                 /* XXX possible chlen underflow */
 4277                 memset(&desc, 0, sizeof(desc));
 4278         }
 4279         trunc_len = (uint16_t) ntohs(cp->trunc_len);
 4280         if (trunc_len > limit) {
 4281                 trunc_len = limit;
 4282         }
 4283         /* now the chunks themselves */
 4284         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
 4285                 desc.chunk_type = ch->chunk_type;
 4286                 /* get amount we need to move */
 4287                 at = ntohs(ch->chunk_length);
 4288                 if (at < sizeof(struct sctp_chunkhdr)) {
 4289                         /* corrupt chunk, maybe at the end? */
 4290                         SCTP_STAT_INCR(sctps_pdrpcrupt);
 4291                         break;
 4292                 }
 4293                 if (trunc_len == 0) {
 4294                         /* we are supposed to have all of it */
 4295                         if (at > chlen) {
 4296                                 /* corrupt skip it */
 4297                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
 4298                                 break;
 4299                         }
 4300                 } else {
 4301                         /* is there enough of it left ? */
 4302                         if (desc.chunk_type == SCTP_DATA) {
 4303                                 if (chlen < (sizeof(struct sctp_data_chunk) +
 4304                                     sizeof(desc.data_bytes))) {
 4305                                         break;
 4306                                 }
 4307                         } else {
 4308                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
 4309                                         break;
 4310                                 }
 4311                         }
 4312                 }
 4313                 if (desc.chunk_type == SCTP_DATA) {
 4314                         /* can we get out the tsn? */
 4315                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
 4316                                 SCTP_STAT_INCR(sctps_pdrpmbda);
 4317 
 4318                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
 4319                                 /* yep */
 4320                                 struct sctp_data_chunk *dcp;
 4321                                 uint8_t *ddp;
 4322                                 unsigned int iii;
 4323 
 4324                                 dcp = (struct sctp_data_chunk *)ch;
 4325                                 ddp = (uint8_t *) (dcp + 1);
 4326                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
 4327                                         desc.data_bytes[iii] = ddp[iii];
 4328                                 }
 4329                                 desc.tsn_ifany = dcp->dp.tsn;
 4330                         } else {
 4331                                 /* nope we are done. */
 4332                                 SCTP_STAT_INCR(sctps_pdrpnedat);
 4333                                 break;
 4334                         }
 4335                 } else {
 4336                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
 4337                                 SCTP_STAT_INCR(sctps_pdrpmbct);
 4338                 }
 4339 
 4340                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
 4341                         SCTP_STAT_INCR(sctps_pdrppdbrk);
 4342                         break;
 4343                 }
 4344                 if (SCTP_SIZE32(at) > chlen) {
 4345                         break;
 4346                 }
 4347                 chlen -= SCTP_SIZE32(at);
 4348                 if (chlen < sizeof(struct sctp_chunkhdr)) {
 4349                         /* done, none left */
 4350                         break;
 4351                 }
 4352                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
 4353         }
 4354         /* Now update any rwnd --- possibly */
 4355         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
 4356                 /* From a peer, we get a rwnd report */
 4357                 uint32_t a_rwnd;
 4358 
 4359                 SCTP_STAT_INCR(sctps_pdrpfehos);
 4360 
 4361                 bottle_bw = ntohl(cp->bottle_bw);
 4362                 on_queue = ntohl(cp->current_onq);
 4363                 if (bottle_bw && on_queue) {
 4364                         /* a rwnd report is in here */
 4365                         if (bottle_bw > on_queue)
 4366                                 a_rwnd = bottle_bw - on_queue;
 4367                         else
 4368                                 a_rwnd = 0;
 4369 
 4370                         if (a_rwnd == 0)
 4371                                 stcb->asoc.peers_rwnd = 0;
 4372                         else {
 4373                                 if (a_rwnd > stcb->asoc.total_flight) {
 4374                                         stcb->asoc.peers_rwnd =
 4375                                             a_rwnd - stcb->asoc.total_flight;
 4376                                 } else {
 4377                                         stcb->asoc.peers_rwnd = 0;
 4378                                 }
 4379                                 if (stcb->asoc.peers_rwnd <
 4380                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 4381                                         /* SWS sender side engages */
 4382                                         stcb->asoc.peers_rwnd = 0;
 4383                                 }
 4384                         }
 4385                 }
 4386         } else {
 4387                 SCTP_STAT_INCR(sctps_pdrpfmbox);
 4388         }
 4389 
 4390         /* now middle boxes in sat networks get a cwnd bump */
 4391         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
 4392             (stcb->asoc.sat_t3_loss_recovery == 0) &&
 4393             (stcb->asoc.sat_network)) {
 4394                 /*
 4395                  * This is debateable but for sat networks it makes sense
 4396                  * Note if a T3 timer has went off, we will prohibit any
 4397                  * changes to cwnd until we exit the t3 loss recovery.
 4398                  */
 4399                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
 4400                     net, cp, &bottle_bw, &on_queue);
 4401         }
 4402 }
 4403 
 4404 /*
 4405  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
 4406  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
 4407  * offset: offset into the mbuf chain to first chunkhdr - length: is the
 4408  * length of the complete packet outputs: - length: modified to remaining
 4409  * length after control processing - netp: modified to new sctp_nets after
 4410  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
 4411  * bad packet,...) otherwise return the tcb for this packet
 4412  */
 4413 #ifdef __GNUC__
 4414 __attribute__((noinline))
 4415 #endif
 4416         static struct sctp_tcb *
 4417                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
 4418              struct sockaddr *src, struct sockaddr *dst,
 4419              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
 4420              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
 4421              uint8_t use_mflowid, uint32_t mflowid,
 4422              uint32_t vrf_id, uint16_t port)
 4423 {
 4424         struct sctp_association *asoc;
 4425         uint32_t vtag_in;
 4426         int num_chunks = 0;     /* number of control chunks processed */
 4427         uint32_t chk_length;
 4428         int ret;
 4429         int abort_no_unlock = 0;
 4430         int ecne_seen = 0;
 4431 
 4432         /*
 4433          * How big should this be, and should it be alloc'd? Lets try the
 4434          * d-mtu-ceiling for now (2k) and that should hopefully work ...
 4435          * until we get into jumbo grams and such..
 4436          */
 4437         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
 4438         struct sctp_tcb *locked_tcb = stcb;
 4439         int got_auth = 0;
 4440         uint32_t auth_offset = 0, auth_len = 0;
 4441         int auth_skipped = 0;
 4442         int asconf_cnt = 0;
 4443 
 4444 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4445         struct socket *so;
 4446 
 4447 #endif
 4448 
 4449         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
 4450             iphlen, *offset, length, (void *)stcb);
 4451 
 4452         /* validate chunk header length... */
 4453         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
 4454                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
 4455                     ntohs(ch->chunk_length));
 4456                 if (locked_tcb) {
 4457                         SCTP_TCB_UNLOCK(locked_tcb);
 4458                 }
 4459                 return (NULL);
 4460         }
 4461         /*
 4462          * validate the verification tag
 4463          */
 4464         vtag_in = ntohl(sh->v_tag);
 4465 
 4466         if (locked_tcb) {
 4467                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
 4468         }
 4469         if (ch->chunk_type == SCTP_INITIATION) {
 4470                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
 4471                     ntohs(ch->chunk_length), vtag_in);
 4472                 if (vtag_in != 0) {
 4473                         /* protocol error- silently discard... */
 4474                         SCTP_STAT_INCR(sctps_badvtag);
 4475                         if (locked_tcb) {
 4476                                 SCTP_TCB_UNLOCK(locked_tcb);
 4477                         }
 4478                         return (NULL);
 4479                 }
 4480         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
 4481                 /*
 4482                  * If there is no stcb, skip the AUTH chunk and process
 4483                  * later after a stcb is found (to validate the lookup was
 4484                  * valid.
 4485                  */
 4486                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
 4487                     (stcb == NULL) &&
 4488                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
 4489                         /* save this chunk for later processing */
 4490                         auth_skipped = 1;
 4491                         auth_offset = *offset;
 4492                         auth_len = ntohs(ch->chunk_length);
 4493 
 4494                         /* (temporarily) move past this chunk */
 4495                         *offset += SCTP_SIZE32(auth_len);
 4496                         if (*offset >= length) {
 4497                                 /* no more data left in the mbuf chain */
 4498                                 *offset = length;
 4499                                 if (locked_tcb) {
 4500                                         SCTP_TCB_UNLOCK(locked_tcb);
 4501                                 }
 4502                                 return (NULL);
 4503                         }
 4504                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4505                             sizeof(struct sctp_chunkhdr), chunk_buf);
 4506                 }
 4507                 if (ch == NULL) {
 4508                         /* Help */
 4509                         *offset = length;
 4510                         if (locked_tcb) {
 4511                                 SCTP_TCB_UNLOCK(locked_tcb);
 4512                         }
 4513                         return (NULL);
 4514                 }
 4515                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
 4516                         goto process_control_chunks;
 4517                 }
 4518                 /*
 4519                  * first check if it's an ASCONF with an unknown src addr we
 4520                  * need to look inside to find the association
 4521                  */
 4522                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
 4523                         struct sctp_chunkhdr *asconf_ch = ch;
 4524                         uint32_t asconf_offset = 0, asconf_len = 0;
 4525 
 4526                         /* inp's refcount may be reduced */
 4527                         SCTP_INP_INCR_REF(inp);
 4528 
 4529                         asconf_offset = *offset;
 4530                         do {
 4531                                 asconf_len = ntohs(asconf_ch->chunk_length);
 4532                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
 4533                                         break;
 4534                                 stcb = sctp_findassociation_ep_asconf(m,
 4535                                     *offset,
 4536                                     dst,
 4537                                     sh, &inp, netp, vrf_id);
 4538                                 if (stcb != NULL)
 4539                                         break;
 4540                                 asconf_offset += SCTP_SIZE32(asconf_len);
 4541                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
 4542                                     sizeof(struct sctp_chunkhdr), chunk_buf);
 4543                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
 4544                         if (stcb == NULL) {
 4545                                 /*
 4546                                  * reduce inp's refcount if not reduced in
 4547                                  * sctp_findassociation_ep_asconf().
 4548                                  */
 4549                                 SCTP_INP_DECR_REF(inp);
 4550                         } else {
 4551                                 locked_tcb = stcb;
 4552                         }
 4553 
 4554                         /* now go back and verify any auth chunk to be sure */
 4555                         if (auth_skipped && (stcb != NULL)) {
 4556                                 struct sctp_auth_chunk *auth;
 4557 
 4558                                 auth = (struct sctp_auth_chunk *)
 4559                                     sctp_m_getptr(m, auth_offset,
 4560                                     auth_len, chunk_buf);
 4561                                 got_auth = 1;
 4562                                 auth_skipped = 0;
 4563                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
 4564                                     auth_offset)) {
 4565                                         /* auth HMAC failed so dump it */
 4566                                         *offset = length;
 4567                                         if (locked_tcb) {
 4568                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4569                                         }
 4570                                         return (NULL);
 4571                                 } else {
 4572                                         /* remaining chunks are HMAC checked */
 4573                                         stcb->asoc.authenticated = 1;
 4574                                 }
 4575                         }
 4576                 }
 4577                 if (stcb == NULL) {
 4578                         /* no association, so it's out of the blue... */
 4579                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp,
 4580                             use_mflowid, mflowid,
 4581                             vrf_id, port);
 4582                         *offset = length;
 4583                         if (locked_tcb) {
 4584                                 SCTP_TCB_UNLOCK(locked_tcb);
 4585                         }
 4586                         return (NULL);
 4587                 }
 4588                 asoc = &stcb->asoc;
 4589                 /* ABORT and SHUTDOWN can use either v_tag... */
 4590                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
 4591                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
 4592                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
 4593                         /* Take the T-bit always into account. */
 4594                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
 4595                             (vtag_in == asoc->my_vtag)) ||
 4596                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
 4597                             (vtag_in == asoc->peer_vtag))) {
 4598                                 /* this is valid */
 4599                         } else {
 4600                                 /* drop this packet... */
 4601                                 SCTP_STAT_INCR(sctps_badvtag);
 4602                                 if (locked_tcb) {
 4603                                         SCTP_TCB_UNLOCK(locked_tcb);
 4604                                 }
 4605                                 return (NULL);
 4606                         }
 4607                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 4608                         if (vtag_in != asoc->my_vtag) {
 4609                                 /*
 4610                                  * this could be a stale SHUTDOWN-ACK or the
 4611                                  * peer never got the SHUTDOWN-COMPLETE and
 4612                                  * is still hung; we have started a new asoc
 4613                                  * but it won't complete until the shutdown
 4614                                  * is completed
 4615                                  */
 4616                                 if (locked_tcb) {
 4617                                         SCTP_TCB_UNLOCK(locked_tcb);
 4618                                 }
 4619                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
 4620                                     sh, inp,
 4621                                     use_mflowid, mflowid,
 4622                                     vrf_id, port);
 4623                                 return (NULL);
 4624                         }
 4625                 } else {
 4626                         /* for all other chunks, vtag must match */
 4627                         if (vtag_in != asoc->my_vtag) {
 4628                                 /* invalid vtag... */
 4629                                 SCTPDBG(SCTP_DEBUG_INPUT3,
 4630                                     "invalid vtag: %xh, expect %xh\n",
 4631                                     vtag_in, asoc->my_vtag);
 4632                                 SCTP_STAT_INCR(sctps_badvtag);
 4633                                 if (locked_tcb) {
 4634                                         SCTP_TCB_UNLOCK(locked_tcb);
 4635                                 }
 4636                                 *offset = length;
 4637                                 return (NULL);
 4638                         }
 4639                 }
 4640         }                       /* end if !SCTP_COOKIE_ECHO */
 4641         /*
 4642          * process all control chunks...
 4643          */
 4644         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
 4645             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
 4646             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
 4647             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 4648                 /* implied cookie-ack.. we must have lost the ack */
 4649                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 4650                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4651                             stcb->asoc.overall_error_count,
 4652                             0,
 4653                             SCTP_FROM_SCTP_INPUT,
 4654                             __LINE__);
 4655                 }
 4656                 stcb->asoc.overall_error_count = 0;
 4657                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
 4658                     *netp);
 4659         }
 4660 process_control_chunks:
 4661         while (IS_SCTP_CONTROL(ch)) {
 4662                 /* validate chunk length */
 4663                 chk_length = ntohs(ch->chunk_length);
 4664                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
 4665                     ch->chunk_type, chk_length);
 4666                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
 4667                 if (chk_length < sizeof(*ch) ||
 4668                     (*offset + (int)chk_length) > length) {
 4669                         *offset = length;
 4670                         if (locked_tcb) {
 4671                                 SCTP_TCB_UNLOCK(locked_tcb);
 4672                         }
 4673                         return (NULL);
 4674                 }
 4675                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
 4676                 /*
 4677                  * INIT-ACK only gets the init ack "header" portion only
 4678                  * because we don't have to process the peer's COOKIE. All
 4679                  * others get a complete chunk.
 4680                  */
 4681                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
 4682                     (ch->chunk_type == SCTP_INITIATION)) {
 4683                         /* get an init-ack chunk */
 4684                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4685                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
 4686                         if (ch == NULL) {
 4687                                 *offset = length;
 4688                                 if (locked_tcb) {
 4689                                         SCTP_TCB_UNLOCK(locked_tcb);
 4690                                 }
 4691                                 return (NULL);
 4692                         }
 4693                 } else {
 4694                         /* For cookies and all other chunks. */
 4695                         if (chk_length > sizeof(chunk_buf)) {
 4696                                 /*
 4697                                  * use just the size of the chunk buffer so
 4698                                  * the front part of our chunks fit in
 4699                                  * contiguous space up to the chunk buffer
 4700                                  * size (508 bytes). For chunks that need to
 4701                                  * get more than that they must use the
 4702                                  * sctp_m_getptr() function or other means
 4703                                  * (e.g. know how to parse mbuf chains).
 4704                                  * Cookies do this already.
 4705                                  */
 4706                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4707                                     (sizeof(chunk_buf) - 4),
 4708                                     chunk_buf);
 4709                                 if (ch == NULL) {
 4710                                         *offset = length;
 4711                                         if (locked_tcb) {
 4712                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4713                                         }
 4714                                         return (NULL);
 4715                                 }
 4716                         } else {
 4717                                 /* We can fit it all */
 4718                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4719                                     chk_length, chunk_buf);
 4720                                 if (ch == NULL) {
 4721                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
 4722                                         *offset = length;
 4723                                         if (locked_tcb) {
 4724                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4725                                         }
 4726                                         return (NULL);
 4727                                 }
 4728                         }
 4729                 }
 4730                 num_chunks++;
 4731                 /* Save off the last place we got a control from */
 4732                 if (stcb != NULL) {
 4733                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
 4734                                 /*
 4735                                  * allow last_control to be NULL if
 4736                                  * ASCONF... ASCONF processing will find the
 4737                                  * right net later
 4738                                  */
 4739                                 if ((netp != NULL) && (*netp != NULL))
 4740                                         stcb->asoc.last_control_chunk_from = *netp;
 4741                         }
 4742                 }
 4743 #ifdef SCTP_AUDITING_ENABLED
 4744                 sctp_audit_log(0xB0, ch->chunk_type);
 4745 #endif
 4746 
 4747                 /* check to see if this chunk required auth, but isn't */
 4748                 if ((stcb != NULL) &&
 4749                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
 4750                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
 4751                     !stcb->asoc.authenticated) {
 4752                         /* "silently" ignore */
 4753                         SCTP_STAT_INCR(sctps_recvauthmissing);
 4754                         goto next_chunk;
 4755                 }
 4756                 switch (ch->chunk_type) {
 4757                 case SCTP_INITIATION:
 4758                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
 4759                         /* The INIT chunk must be the only chunk. */
 4760                         if ((num_chunks > 1) ||
 4761                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 4762                                 sctp_abort_association(inp, stcb, m, iphlen,
 4763                                     src, dst, sh, NULL,
 4764                                     use_mflowid, mflowid,
 4765                                     vrf_id, port);
 4766                                 *offset = length;
 4767                                 return (NULL);
 4768                         }
 4769                         /* Honor our resource limit. */
 4770                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
 4771                                 struct mbuf *op_err;
 4772 
 4773                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 4774                                 sctp_abort_association(inp, stcb, m, iphlen,
 4775                                     src, dst, sh, op_err,
 4776                                     use_mflowid, mflowid,
 4777                                     vrf_id, port);
 4778                                 *offset = length;
 4779                                 return (NULL);
 4780                         }
 4781                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
 4782                             (struct sctp_init_chunk *)ch, inp,
 4783                             stcb, &abort_no_unlock,
 4784                             use_mflowid, mflowid,
 4785                             vrf_id, port);
 4786                         *offset = length;
 4787                         if ((!abort_no_unlock) && (locked_tcb)) {
 4788                                 SCTP_TCB_UNLOCK(locked_tcb);
 4789                         }
 4790                         return (NULL);
 4791                         break;
 4792                 case SCTP_PAD_CHUNK:
 4793                         break;
 4794                 case SCTP_INITIATION_ACK:
 4795                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
 4796                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4797                                 /* We are not interested anymore */
 4798                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 4799                                         ;
 4800                                 } else {
 4801                                         if (locked_tcb != stcb) {
 4802                                                 /* Very unlikely */
 4803                                                 SCTP_TCB_UNLOCK(locked_tcb);
 4804                                         }
 4805                                         *offset = length;
 4806                                         if (stcb) {
 4807 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4808                                                 so = SCTP_INP_SO(inp);
 4809                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4810                                                 SCTP_TCB_UNLOCK(stcb);
 4811                                                 SCTP_SOCKET_LOCK(so, 1);
 4812                                                 SCTP_TCB_LOCK(stcb);
 4813                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4814 #endif
 4815                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
 4816 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4817                                                 SCTP_SOCKET_UNLOCK(so, 1);
 4818 #endif
 4819                                         }
 4820                                         return (NULL);
 4821                                 }
 4822                         }
 4823                         /* The INIT-ACK chunk must be the only chunk. */
 4824                         if ((num_chunks > 1) ||
 4825                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 4826                                 *offset = length;
 4827                                 if (locked_tcb) {
 4828                                         SCTP_TCB_UNLOCK(locked_tcb);
 4829                                 }
 4830                                 return (NULL);
 4831                         }
 4832                         if ((netp) && (*netp)) {
 4833                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
 4834                                     src, dst, sh,
 4835                                     (struct sctp_init_ack_chunk *)ch,
 4836                                     stcb, *netp,
 4837                                     &abort_no_unlock,
 4838                                     use_mflowid, mflowid,
 4839                                     vrf_id);
 4840                         } else {
 4841                                 ret = -1;
 4842                         }
 4843                         *offset = length;
 4844                         if (abort_no_unlock) {
 4845                                 return (NULL);
 4846                         }
 4847                         /*
 4848                          * Special case, I must call the output routine to
 4849                          * get the cookie echoed
 4850                          */
 4851                         if ((stcb != NULL) && (ret == 0)) {
 4852                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 4853                         }
 4854                         if (locked_tcb) {
 4855                                 SCTP_TCB_UNLOCK(locked_tcb);
 4856                         }
 4857                         return (NULL);
 4858                         break;
 4859                 case SCTP_SELECTIVE_ACK:
 4860                         {
 4861                                 struct sctp_sack_chunk *sack;
 4862                                 int abort_now = 0;
 4863                                 uint32_t a_rwnd, cum_ack;
 4864                                 uint16_t num_seg, num_dup;
 4865                                 uint8_t flags;
 4866                                 int offset_seg, offset_dup;
 4867 
 4868                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
 4869                                 SCTP_STAT_INCR(sctps_recvsacks);
 4870                                 if (stcb == NULL) {
 4871                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
 4872                                         break;
 4873                                 }
 4874                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
 4875                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
 4876                                         break;
 4877                                 }
 4878                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 4879                                         /*-
 4880                                          * If we have sent a shutdown-ack, we will pay no
 4881                                          * attention to a sack sent in to us since
 4882                                          * we don't care anymore.
 4883                                          */
 4884                                         break;
 4885                                 }
 4886                                 sack = (struct sctp_sack_chunk *)ch;
 4887                                 flags = ch->chunk_flags;
 4888                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
 4889                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
 4890                                 num_dup = ntohs(sack->sack.num_dup_tsns);
 4891                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
 4892                                 if (sizeof(struct sctp_sack_chunk) +
 4893                                     num_seg * sizeof(struct sctp_gap_ack_block) +
 4894                                     num_dup * sizeof(uint32_t) != chk_length) {
 4895                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
 4896                                         break;
 4897                                 }
 4898                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
 4899                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
 4900                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
 4901                                     cum_ack, num_seg, a_rwnd);
 4902                                 stcb->asoc.seen_a_sack_this_pkt = 1;
 4903                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
 4904                                     (num_seg == 0) &&
 4905                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
 4906                                     (stcb->asoc.saw_sack_with_frags == 0) &&
 4907                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
 4908                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
 4909                                     ) {
 4910                                         /*
 4911                                          * We have a SIMPLE sack having no
 4912                                          * prior segments and data on sent
 4913                                          * queue to be acked.. Use the
 4914                                          * faster path sack processing. We
 4915                                          * also allow window update sacks
 4916                                          * with no missing segments to go
 4917                                          * this way too.
 4918                                          */
 4919                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
 4920                                 } else {
 4921                                         if (netp && *netp)
 4922                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
 4923                                                     num_seg, 0, num_dup, &abort_now, flags,
 4924                                                     cum_ack, a_rwnd, ecne_seen);
 4925                                 }
 4926                                 if (abort_now) {
 4927                                         /* ABORT signal from sack processing */
 4928                                         *offset = length;
 4929                                         return (NULL);
 4930                                 }
 4931                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
 4932                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
 4933                                     (stcb->asoc.stream_queue_cnt == 0)) {
 4934                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 4935                                 }
 4936                         }
 4937                         break;
 4938                         /*
 4939                          * EY - nr_sack:  If the received chunk is an
 4940                          * nr_sack chunk
 4941                          */
 4942                 case SCTP_NR_SELECTIVE_ACK:
 4943                         {
 4944                                 struct sctp_nr_sack_chunk *nr_sack;
 4945                                 int abort_now = 0;
 4946                                 uint32_t a_rwnd, cum_ack;
 4947                                 uint16_t num_seg, num_nr_seg, num_dup;
 4948                                 uint8_t flags;
 4949                                 int offset_seg, offset_dup;
 4950 
 4951                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
 4952                                 SCTP_STAT_INCR(sctps_recvsacks);
 4953                                 if (stcb == NULL) {
 4954                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
 4955                                         break;
 4956                                 }
 4957                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
 4958                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
 4959                                         goto unknown_chunk;
 4960                                 }
 4961                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
 4962                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
 4963                                         break;
 4964                                 }
 4965                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 4966                                         /*-
 4967                                          * If we have sent a shutdown-ack, we will pay no
 4968                                          * attention to a sack sent in to us since
 4969                                          * we don't care anymore.
 4970                                          */
 4971                                         break;
 4972                                 }
 4973                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
 4974                                 flags = ch->chunk_flags;
 4975                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
 4976                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
 4977                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
 4978                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
 4979                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
 4980                                 if (sizeof(struct sctp_nr_sack_chunk) +
 4981                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
 4982                                     num_dup * sizeof(uint32_t) != chk_length) {
 4983                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
 4984                                         break;
 4985                                 }
 4986                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
 4987                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
 4988                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
 4989                                     cum_ack, num_seg, a_rwnd);
 4990                                 stcb->asoc.seen_a_sack_this_pkt = 1;
 4991                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
 4992                                     (num_seg == 0) && (num_nr_seg == 0) &&
 4993                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
 4994                                     (stcb->asoc.saw_sack_with_frags == 0) &&
 4995                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
 4996                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 4997                                         /*
 4998                                          * We have a SIMPLE sack having no
 4999                                          * prior segments and data on sent
 5000                                          * queue to be acked. Use the faster
 5001                                          * path sack processing. We also
 5002                                          * allow window update sacks with no
 5003                                          * missing segments to go this way
 5004                                          * too.
 5005                                          */
 5006                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
 5007                                             &abort_now, ecne_seen);
 5008                                 } else {
 5009                                         if (netp && *netp)
 5010                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
 5011                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
 5012                                                     cum_ack, a_rwnd, ecne_seen);
 5013                                 }
 5014                                 if (abort_now) {
 5015                                         /* ABORT signal from sack processing */
 5016                                         *offset = length;
 5017                                         return (NULL);
 5018                                 }
 5019                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
 5020                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
 5021                                     (stcb->asoc.stream_queue_cnt == 0)) {
 5022                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 5023                                 }
 5024                         }
 5025                         break;
 5026 
 5027                 case SCTP_HEARTBEAT_REQUEST:
 5028                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
 5029                         if ((stcb) && netp && *netp) {
 5030                                 SCTP_STAT_INCR(sctps_recvheartbeat);
 5031                                 sctp_send_heartbeat_ack(stcb, m, *offset,
 5032                                     chk_length, *netp);
 5033 
 5034                                 /* He's alive so give him credit */
 5035                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5036                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5037                                             stcb->asoc.overall_error_count,
 5038                                             0,
 5039                                             SCTP_FROM_SCTP_INPUT,
 5040                                             __LINE__);
 5041                                 }
 5042                                 stcb->asoc.overall_error_count = 0;
 5043                         }
 5044                         break;
 5045                 case SCTP_HEARTBEAT_ACK:
 5046                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
 5047                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
 5048                                 /* Its not ours */
 5049                                 *offset = length;
 5050                                 if (locked_tcb) {
 5051                                         SCTP_TCB_UNLOCK(locked_tcb);
 5052                                 }
 5053                                 return (NULL);
 5054                         }
 5055                         /* He's alive so give him credit */
 5056                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5057                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5058                                     stcb->asoc.overall_error_count,
 5059                                     0,
 5060                                     SCTP_FROM_SCTP_INPUT,
 5061                                     __LINE__);
 5062                         }
 5063                         stcb->asoc.overall_error_count = 0;
 5064                         SCTP_STAT_INCR(sctps_recvheartbeatack);
 5065                         if (netp && *netp)
 5066                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
 5067                                     stcb, *netp);
 5068                         break;
 5069                 case SCTP_ABORT_ASSOCIATION:
 5070                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
 5071                             (void *)stcb);
 5072                         if ((stcb) && netp && *netp)
 5073                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
 5074                                     stcb, *netp);
 5075                         *offset = length;
 5076                         return (NULL);
 5077                         break;
 5078                 case SCTP_SHUTDOWN:
 5079                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
 5080                             (void *)stcb);
 5081                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
 5082                                 *offset = length;
 5083                                 if (locked_tcb) {
 5084                                         SCTP_TCB_UNLOCK(locked_tcb);
 5085                                 }
 5086                                 return (NULL);
 5087                         }
 5088                         if (netp && *netp) {
 5089                                 int abort_flag = 0;
 5090 
 5091                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
 5092                                     stcb, *netp, &abort_flag);
 5093                                 if (abort_flag) {
 5094                                         *offset = length;
 5095                                         return (NULL);
 5096                                 }
 5097                         }
 5098                         break;
 5099                 case SCTP_SHUTDOWN_ACK:
 5100                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
 5101                         if ((stcb) && (netp) && (*netp))
 5102                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
 5103                         *offset = length;
 5104                         return (NULL);
 5105                         break;
 5106 
 5107                 case SCTP_OPERATION_ERROR:
 5108                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
 5109                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
 5110                                 *offset = length;
 5111                                 return (NULL);
 5112                         }
 5113                         break;
 5114                 case SCTP_COOKIE_ECHO:
 5115                         SCTPDBG(SCTP_DEBUG_INPUT3,
 5116                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
 5117                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 5118                                 ;
 5119                         } else {
 5120                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5121                                         /* We are not interested anymore */
 5122                         abend:
 5123                                         if (stcb) {
 5124                                                 SCTP_TCB_UNLOCK(stcb);
 5125                                         }
 5126                                         *offset = length;
 5127                                         return (NULL);
 5128                                 }
 5129                         }
 5130                         /*
 5131                          * First are we accepting? We do this again here
 5132                          * since it is possible that a previous endpoint WAS
 5133                          * listening responded to a INIT-ACK and then
 5134                          * closed. We opened and bound.. and are now no
 5135                          * longer listening.
 5136                          */
 5137 
 5138                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
 5139                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 5140                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
 5141                                         struct mbuf *op_err;
 5142 
 5143                                         op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 5144                                         sctp_abort_association(inp, stcb, m, iphlen,
 5145                                             src, dst, sh, op_err,
 5146                                             use_mflowid, mflowid,
 5147                                             vrf_id, port);
 5148                                 }
 5149                                 *offset = length;
 5150                                 return (NULL);
 5151                         } else {
 5152                                 struct mbuf *ret_buf;
 5153                                 struct sctp_inpcb *linp;
 5154 
 5155                                 if (stcb) {
 5156                                         linp = NULL;
 5157                                 } else {
 5158                                         linp = inp;
 5159                                 }
 5160 
 5161                                 if (linp) {
 5162                                         SCTP_ASOC_CREATE_LOCK(linp);
 5163                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 5164                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
 5165                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
 5166                                                 goto abend;
 5167                                         }
 5168                                 }
 5169                                 if (netp) {
 5170                                         ret_buf =
 5171                                             sctp_handle_cookie_echo(m, iphlen,
 5172                                             *offset,
 5173                                             src, dst,
 5174                                             sh,
 5175                                             (struct sctp_cookie_echo_chunk *)ch,
 5176                                             &inp, &stcb, netp,
 5177                                             auth_skipped,
 5178                                             auth_offset,
 5179                                             auth_len,
 5180                                             &locked_tcb,
 5181                                             use_mflowid,
 5182                                             mflowid,
 5183                                             vrf_id,
 5184                                             port);
 5185                                 } else {
 5186                                         ret_buf = NULL;
 5187                                 }
 5188                                 if (linp) {
 5189                                         SCTP_ASOC_CREATE_UNLOCK(linp);
 5190                                 }
 5191                                 if (ret_buf == NULL) {
 5192                                         if (locked_tcb) {
 5193                                                 SCTP_TCB_UNLOCK(locked_tcb);
 5194                                         }
 5195                                         SCTPDBG(SCTP_DEBUG_INPUT3,
 5196                                             "GAK, null buffer\n");
 5197                                         *offset = length;
 5198                                         return (NULL);
 5199                                 }
 5200                                 /* if AUTH skipped, see if it verified... */
 5201                                 if (auth_skipped) {
 5202                                         got_auth = 1;
 5203                                         auth_skipped = 0;
 5204                                 }
 5205                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
 5206                                         /*
 5207                                          * Restart the timer if we have
 5208                                          * pending data
 5209                                          */
 5210                                         struct sctp_tmit_chunk *chk;
 5211 
 5212                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
 5213                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
 5214                                 }
 5215                         }
 5216                         break;
 5217                 case SCTP_COOKIE_ACK:
 5218                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
 5219                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
 5220                                 if (locked_tcb) {
 5221                                         SCTP_TCB_UNLOCK(locked_tcb);
 5222                                 }
 5223                                 return (NULL);
 5224                         }
 5225                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5226                                 /* We are not interested anymore */
 5227                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 5228                                         ;
 5229                                 } else if (stcb) {
 5230 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5231                                         so = SCTP_INP_SO(inp);
 5232                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5233                                         SCTP_TCB_UNLOCK(stcb);
 5234                                         SCTP_SOCKET_LOCK(so, 1);
 5235                                         SCTP_TCB_LOCK(stcb);
 5236                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 5237 #endif
 5238                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
 5239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5240                                         SCTP_SOCKET_UNLOCK(so, 1);
 5241 #endif
 5242                                         *offset = length;
 5243                                         return (NULL);
 5244                                 }
 5245                         }
 5246                         /* He's alive so give him credit */
 5247                         if ((stcb) && netp && *netp) {
 5248                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5249                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5250                                             stcb->asoc.overall_error_count,
 5251                                             0,
 5252                                             SCTP_FROM_SCTP_INPUT,
 5253                                             __LINE__);
 5254                                 }
 5255                                 stcb->asoc.overall_error_count = 0;
 5256                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
 5257                         }
 5258                         break;
 5259                 case SCTP_ECN_ECHO:
 5260                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
 5261                         /* He's alive so give him credit */
 5262                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
 5263                                 /* Its not ours */
 5264                                 if (locked_tcb) {
 5265                                         SCTP_TCB_UNLOCK(locked_tcb);
 5266                                 }
 5267                                 *offset = length;
 5268                                 return (NULL);
 5269                         }
 5270                         if (stcb) {
 5271                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5272                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5273                                             stcb->asoc.overall_error_count,
 5274                                             0,
 5275                                             SCTP_FROM_SCTP_INPUT,
 5276                                             __LINE__);
 5277                                 }
 5278                                 stcb->asoc.overall_error_count = 0;
 5279                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
 5280                                     stcb);
 5281                                 ecne_seen = 1;
 5282                         }
 5283                         break;
 5284                 case SCTP_ECN_CWR:
 5285                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
 5286                         /* He's alive so give him credit */
 5287                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
 5288                                 /* Its not ours */
 5289                                 if (locked_tcb) {
 5290                                         SCTP_TCB_UNLOCK(locked_tcb);
 5291                                 }
 5292                                 *offset = length;
 5293                                 return (NULL);
 5294                         }
 5295                         if (stcb) {
 5296                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5297                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5298                                             stcb->asoc.overall_error_count,
 5299                                             0,
 5300                                             SCTP_FROM_SCTP_INPUT,
 5301                                             __LINE__);
 5302                                 }
 5303                                 stcb->asoc.overall_error_count = 0;
 5304                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
 5305                         }
 5306                         break;
 5307                 case SCTP_SHUTDOWN_COMPLETE:
 5308                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
 5309                         /* must be first and only chunk */
 5310                         if ((num_chunks > 1) ||
 5311                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 5312                                 *offset = length;
 5313                                 if (locked_tcb) {
 5314                                         SCTP_TCB_UNLOCK(locked_tcb);
 5315                                 }
 5316                                 return (NULL);
 5317                         }
 5318                         if ((stcb) && netp && *netp) {
 5319                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
 5320                                     stcb, *netp);
 5321                         }
 5322                         *offset = length;
 5323                         return (NULL);
 5324                         break;
 5325                 case SCTP_ASCONF:
 5326                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
 5327                         /* He's alive so give him credit */
 5328                         if (stcb) {
 5329                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5330                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5331                                             stcb->asoc.overall_error_count,
 5332                                             0,
 5333                                             SCTP_FROM_SCTP_INPUT,
 5334                                             __LINE__);
 5335                                 }
 5336                                 stcb->asoc.overall_error_count = 0;
 5337                                 sctp_handle_asconf(m, *offset, src,
 5338                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
 5339                                 asconf_cnt++;
 5340                         }
 5341                         break;
 5342                 case SCTP_ASCONF_ACK:
 5343                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
 5344                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
 5345                                 /* Its not ours */
 5346                                 if (locked_tcb) {
 5347                                         SCTP_TCB_UNLOCK(locked_tcb);
 5348                                 }
 5349                                 *offset = length;
 5350                                 return (NULL);
 5351                         }
 5352                         if ((stcb) && netp && *netp) {
 5353                                 /* He's alive so give him credit */
 5354                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5355                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5356                                             stcb->asoc.overall_error_count,
 5357                                             0,
 5358                                             SCTP_FROM_SCTP_INPUT,
 5359                                             __LINE__);
 5360                                 }
 5361                                 stcb->asoc.overall_error_count = 0;
 5362                                 sctp_handle_asconf_ack(m, *offset,
 5363                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
 5364                                 if (abort_no_unlock)
 5365                                         return (NULL);
 5366                         }
 5367                         break;
 5368                 case SCTP_FORWARD_CUM_TSN:
 5369                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
 5370                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
 5371                                 /* Its not ours */
 5372                                 if (locked_tcb) {
 5373                                         SCTP_TCB_UNLOCK(locked_tcb);
 5374                                 }
 5375                                 *offset = length;
 5376                                 return (NULL);
 5377                         }
 5378                         /* He's alive so give him credit */
 5379                         if (stcb) {
 5380                                 int abort_flag = 0;
 5381 
 5382                                 stcb->asoc.overall_error_count = 0;
 5383                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5384                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5385                                             stcb->asoc.overall_error_count,
 5386                                             0,
 5387                                             SCTP_FROM_SCTP_INPUT,
 5388                                             __LINE__);
 5389                                 }
 5390                                 *fwd_tsn_seen = 1;
 5391                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5392                                         /* We are not interested anymore */
 5393 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5394                                         so = SCTP_INP_SO(inp);
 5395                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5396                                         SCTP_TCB_UNLOCK(stcb);
 5397                                         SCTP_SOCKET_LOCK(so, 1);
 5398                                         SCTP_TCB_LOCK(stcb);
 5399                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 5400 #endif
 5401                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
 5402 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5403                                         SCTP_SOCKET_UNLOCK(so, 1);
 5404 #endif
 5405                                         *offset = length;
 5406                                         return (NULL);
 5407                                 }
 5408                                 sctp_handle_forward_tsn(stcb,
 5409                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
 5410                                 if (abort_flag) {
 5411                                         *offset = length;
 5412                                         return (NULL);
 5413                                 } else {
 5414                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5415                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5416                                                     stcb->asoc.overall_error_count,
 5417                                                     0,
 5418                                                     SCTP_FROM_SCTP_INPUT,
 5419                                                     __LINE__);
 5420                                         }
 5421                                         stcb->asoc.overall_error_count = 0;
 5422                                 }
 5423 
 5424                         }
 5425                         break;
 5426                 case SCTP_STREAM_RESET:
 5427                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
 5428                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
 5429                                 /* Its not ours */
 5430                                 if (locked_tcb) {
 5431                                         SCTP_TCB_UNLOCK(locked_tcb);
 5432                                 }
 5433                                 *offset = length;
 5434                                 return (NULL);
 5435                         }
 5436                         if (stcb->asoc.peer_supports_strreset == 0) {
 5437                                 /*
 5438                                  * hmm, peer should have announced this, but
 5439                                  * we will turn it on since he is sending us
 5440                                  * a stream reset.
 5441                                  */
 5442                                 stcb->asoc.peer_supports_strreset = 1;
 5443                         }
 5444                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
 5445                                 /* stop processing */
 5446                                 *offset = length;
 5447                                 return (NULL);
 5448                         }
 5449                         break;
 5450                 case SCTP_PACKET_DROPPED:
 5451                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
 5452                         /* re-get it all please */
 5453                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
 5454                                 /* Its not ours */
 5455                                 if (locked_tcb) {
 5456                                         SCTP_TCB_UNLOCK(locked_tcb);
 5457                                 }
 5458                                 *offset = length;
 5459                                 return (NULL);
 5460                         }
 5461                         if (ch && (stcb) && netp && (*netp)) {
 5462                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
 5463                                     stcb, *netp,
 5464                                     min(chk_length, (sizeof(chunk_buf) - 4)));
 5465 
 5466                         }
 5467                         break;
 5468 
 5469                 case SCTP_AUTHENTICATION:
 5470                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
 5471                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
 5472                                 goto unknown_chunk;
 5473 
 5474                         if (stcb == NULL) {
 5475                                 /* save the first AUTH for later processing */
 5476                                 if (auth_skipped == 0) {
 5477                                         auth_offset = *offset;
 5478                                         auth_len = chk_length;
 5479                                         auth_skipped = 1;
 5480                                 }
 5481                                 /* skip this chunk (temporarily) */
 5482                                 goto next_chunk;
 5483                         }
 5484                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
 5485                             (chk_length > (sizeof(struct sctp_auth_chunk) +
 5486                             SCTP_AUTH_DIGEST_LEN_MAX))) {
 5487                                 /* Its not ours */
 5488                                 if (locked_tcb) {
 5489                                         SCTP_TCB_UNLOCK(locked_tcb);
 5490                                 }
 5491                                 *offset = length;
 5492                                 return (NULL);
 5493                         }
 5494                         if (got_auth == 1) {
 5495                                 /* skip this chunk... it's already auth'd */
 5496                                 goto next_chunk;
 5497                         }
 5498                         got_auth = 1;
 5499                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
 5500                             m, *offset)) {
 5501                                 /* auth HMAC failed so dump the packet */
 5502                                 *offset = length;
 5503                                 return (stcb);
 5504                         } else {
 5505                                 /* remaining chunks are HMAC checked */
 5506                                 stcb->asoc.authenticated = 1;
 5507                         }
 5508                         break;
 5509 
 5510                 default:
 5511         unknown_chunk:
 5512                         /* it's an unknown chunk! */
 5513                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
 5514                                 struct mbuf *mm;
 5515                                 struct sctp_paramhdr *phd;
 5516 
 5517                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 5518                                     0, M_NOWAIT, 1, MT_DATA);
 5519                                 if (mm) {
 5520                                         phd = mtod(mm, struct sctp_paramhdr *);
 5521                                         /*
 5522                                          * We cheat and use param type since
 5523                                          * we did not bother to define a
 5524                                          * error cause struct. They are the
 5525                                          * same basic format with different
 5526                                          * names.
 5527                                          */
 5528                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
 5529                                         phd->param_length = htons(chk_length + sizeof(*phd));
 5530                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
 5531                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT);
 5532                                         if (SCTP_BUF_NEXT(mm)) {
 5533                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
 5534                                                         sctp_m_freem(mm);
 5535                                                 } else {
 5536 #ifdef SCTP_MBUF_LOGGING
 5537                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 5538                                                                 struct mbuf *mat;
 5539 
 5540                                                                 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
 5541                                                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 5542                                                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
 5543                                                                         }
 5544                                                                 }
 5545                                                         }
 5546 #endif
 5547                                                         sctp_queue_op_err(stcb, mm);
 5548                                                 }
 5549                                         } else {
 5550                                                 sctp_m_freem(mm);
 5551                                         }
 5552                                 }
 5553                         }
 5554                         if ((ch->chunk_type & 0x80) == 0) {
 5555                                 /* discard this packet */
 5556                                 *offset = length;
 5557                                 return (stcb);
 5558                         }       /* else skip this bad chunk and continue... */
 5559                         break;
 5560                 }               /* switch (ch->chunk_type) */
 5561 
 5562 
 5563 next_chunk:
 5564                 /* get the next chunk */
 5565                 *offset += SCTP_SIZE32(chk_length);
 5566                 if (*offset >= length) {
 5567                         /* no more data left in the mbuf chain */
 5568                         break;
 5569                 }
 5570                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 5571                     sizeof(struct sctp_chunkhdr), chunk_buf);
 5572                 if (ch == NULL) {
 5573                         if (locked_tcb) {
 5574                                 SCTP_TCB_UNLOCK(locked_tcb);
 5575                         }
 5576                         *offset = length;
 5577                         return (NULL);
 5578                 }
 5579         }                       /* while */
 5580 
 5581         if (asconf_cnt > 0 && stcb != NULL) {
 5582                 sctp_send_asconf_ack(stcb);
 5583         }
 5584         return (stcb);
 5585 }
 5586 
 5587 
 5588 #ifdef INVARIANTS
 5589 #ifdef __GNUC__
 5590 __attribute__((noinline))
 5591 #endif
 5592         void
 5593              sctp_validate_no_locks(struct sctp_inpcb *inp)
 5594 {
 5595         struct sctp_tcb *lstcb;
 5596 
 5597         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
 5598                 if (mtx_owned(&lstcb->tcb_mtx)) {
 5599                         panic("Own lock on stcb at return from input");
 5600                 }
 5601         }
 5602         if (mtx_owned(&inp->inp_create_mtx)) {
 5603                 panic("Own create lock on inp");
 5604         }
 5605         if (mtx_owned(&inp->inp_mtx)) {
 5606                 panic("Own inp lock on inp");
 5607         }
 5608 }
 5609 
 5610 #endif
 5611 
 5612 /*
 5613  * common input chunk processing (v4 and v6)
 5614  */
 5615 void
 5616 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
 5617     struct sockaddr *src, struct sockaddr *dst,
 5618     struct sctphdr *sh, struct sctp_chunkhdr *ch,
 5619 #if !defined(SCTP_WITH_NO_CSUM)
 5620     uint8_t compute_crc,
 5621 #endif
 5622     uint8_t ecn_bits,
 5623     uint8_t use_mflowid, uint32_t mflowid,
 5624     uint32_t vrf_id, uint16_t port)
 5625 {
 5626         uint32_t high_tsn;
 5627         int fwd_tsn_seen = 0, data_processed = 0;
 5628         struct mbuf *m = *mm;
 5629         int un_sent;
 5630         int cnt_ctrl_ready = 0;
 5631         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
 5632         struct sctp_tcb *stcb = NULL;
 5633         struct sctp_nets *net = NULL;
 5634 
 5635         SCTP_STAT_INCR(sctps_recvdatagrams);
 5636 #ifdef SCTP_AUDITING_ENABLED
 5637         sctp_audit_log(0xE0, 1);
 5638         sctp_auditing(0, inp, stcb, net);
 5639 #endif
 5640 #if !defined(SCTP_WITH_NO_CSUM)
 5641         if (compute_crc != 0) {
 5642                 uint32_t check, calc_check;
 5643 
 5644                 check = sh->checksum;
 5645                 sh->checksum = 0;
 5646                 calc_check = sctp_calculate_cksum(m, iphlen);
 5647                 sh->checksum = check;
 5648                 if (calc_check != check) {
 5649                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
 5650                             calc_check, check, (void *)m, length, iphlen);
 5651                         stcb = sctp_findassociation_addr(m, offset, src, dst,
 5652                             sh, ch, &inp, &net, vrf_id);
 5653                         if ((net != NULL) && (port != 0)) {
 5654                                 if (net->port == 0) {
 5655                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 5656                                 }
 5657                                 net->port = port;
 5658                         }
 5659                         if ((net != NULL) && (use_mflowid != 0)) {
 5660                                 net->flowid = mflowid;
 5661 #ifdef INVARIANTS
 5662                                 net->flowidset = 1;
 5663 #endif
 5664                         }
 5665                         if ((inp != NULL) && (stcb != NULL)) {
 5666                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
 5667                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 5668                         } else if ((inp != NULL) && (stcb == NULL)) {
 5669                                 inp_decr = inp;
 5670                         }
 5671                         SCTP_STAT_INCR(sctps_badsum);
 5672                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 5673                         goto out;
 5674                 }
 5675         }
 5676 #endif
 5677         /* Destination port of 0 is illegal, based on RFC4960. */
 5678         if (sh->dest_port == 0) {
 5679                 SCTP_STAT_INCR(sctps_hdrops);
 5680                 goto out;
 5681         }
 5682         stcb = sctp_findassociation_addr(m, offset, src, dst,
 5683             sh, ch, &inp, &net, vrf_id);
 5684         if ((net != NULL) && (port != 0)) {
 5685                 if (net->port == 0) {
 5686                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 5687                 }
 5688                 net->port = port;
 5689         }
 5690         if ((net != NULL) && (use_mflowid != 0)) {
 5691                 net->flowid = mflowid;
 5692 #ifdef INVARIANTS
 5693                 net->flowidset = 1;
 5694 #endif
 5695         }
 5696         if (inp == NULL) {
 5697                 SCTP_STAT_INCR(sctps_noport);
 5698                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
 5699                         goto out;
 5700                 }
 5701                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 5702                         sctp_send_shutdown_complete2(src, dst, sh,
 5703                             use_mflowid, mflowid,
 5704                             vrf_id, port);
 5705                         goto out;
 5706                 }
 5707                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 5708                         goto out;
 5709                 }
 5710                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
 5711                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
 5712                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
 5713                             (ch->chunk_type != SCTP_INIT))) {
 5714                                 sctp_send_abort(m, iphlen, src, dst,
 5715                                     sh, 0, NULL,
 5716                                     use_mflowid, mflowid,
 5717                                     vrf_id, port);
 5718                         }
 5719                 }
 5720                 goto out;
 5721         } else if (stcb == NULL) {
 5722                 inp_decr = inp;
 5723         }
 5724 #ifdef IPSEC
 5725         /*-
 5726          * I very much doubt any of the IPSEC stuff will work but I have no
 5727          * idea, so I will leave it in place.
 5728          */
 5729         if (inp != NULL) {
 5730                 switch (dst->sa_family) {
 5731 #ifdef INET
 5732                 case AF_INET:
 5733                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
 5734                                 IPSECSTAT_INC(ips_in_polvio);
 5735                                 SCTP_STAT_INCR(sctps_hdrops);
 5736                                 goto out;
 5737                         }
 5738                         break;
 5739 #endif
 5740 #ifdef INET6
 5741                 case AF_INET6:
 5742                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
 5743                                 IPSEC6STAT_INC(ips_in_polvio);
 5744                                 SCTP_STAT_INCR(sctps_hdrops);
 5745                                 goto out;
 5746                         }
 5747                         break;
 5748 #endif
 5749                 default:
 5750                         break;
 5751                 }
 5752         }
 5753 #endif
 5754         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
 5755             (void *)m, iphlen, offset, length, (void *)stcb);
 5756         if (stcb) {
 5757                 /* always clear this before beginning a packet */
 5758                 stcb->asoc.authenticated = 0;
 5759                 stcb->asoc.seen_a_sack_this_pkt = 0;
 5760                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
 5761                     (void *)stcb, stcb->asoc.state);
 5762 
 5763                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
 5764                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
 5765                         /*-
 5766                          * If we hit here, we had a ref count
 5767                          * up when the assoc was aborted and the
 5768                          * timer is clearing out the assoc, we should
 5769                          * NOT respond to any packet.. its OOTB.
 5770                          */
 5771                         SCTP_TCB_UNLOCK(stcb);
 5772                         stcb = NULL;
 5773                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
 5774                             use_mflowid, mflowid,
 5775                             vrf_id, port);
 5776                         goto out;
 5777                 }
 5778         }
 5779         if (IS_SCTP_CONTROL(ch)) {
 5780                 /* process the control portion of the SCTP packet */
 5781                 /* sa_ignore NO_NULL_CHK */
 5782                 stcb = sctp_process_control(m, iphlen, &offset, length,
 5783                     src, dst, sh, ch,
 5784                     inp, stcb, &net, &fwd_tsn_seen,
 5785                     use_mflowid, mflowid,
 5786                     vrf_id, port);
 5787                 if (stcb) {
 5788                         /*
 5789                          * This covers us if the cookie-echo was there and
 5790                          * it changes our INP.
 5791                          */
 5792                         inp = stcb->sctp_ep;
 5793                         if ((net) && (port)) {
 5794                                 if (net->port == 0) {
 5795                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
 5796                                 }
 5797                                 net->port = port;
 5798                         }
 5799                 }
 5800         } else {
 5801                 /*
 5802                  * no control chunks, so pre-process DATA chunks (these
 5803                  * checks are taken care of by control processing)
 5804                  */
 5805 
 5806                 /*
 5807                  * if DATA only packet, and auth is required, then punt...
 5808                  * can't have authenticated without any AUTH (control)
 5809                  * chunks
 5810                  */
 5811                 if ((stcb != NULL) &&
 5812                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
 5813                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
 5814                         /* "silently" ignore */
 5815                         SCTP_STAT_INCR(sctps_recvauthmissing);
 5816                         goto out;
 5817                 }
 5818                 if (stcb == NULL) {
 5819                         /* out of the blue DATA chunk */
 5820                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
 5821                             use_mflowid, mflowid,
 5822                             vrf_id, port);
 5823                         goto out;
 5824                 }
 5825                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
 5826                         /* v_tag mismatch! */
 5827                         SCTP_STAT_INCR(sctps_badvtag);
 5828                         goto out;
 5829                 }
 5830         }
 5831 
 5832         if (stcb == NULL) {
 5833                 /*
 5834                  * no valid TCB for this packet, or we found it's a bad
 5835                  * packet while processing control, or we're done with this
 5836                  * packet (done or skip rest of data), so we drop it...
 5837                  */
 5838                 goto out;
 5839         }
 5840         /*
 5841          * DATA chunk processing
 5842          */
 5843         /* plow through the data chunks while length > offset */
 5844 
 5845         /*
 5846          * Rest should be DATA only.  Check authentication state if AUTH for
 5847          * DATA is required.
 5848          */
 5849         if ((length > offset) &&
 5850             (stcb != NULL) &&
 5851             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
 5852             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
 5853             !stcb->asoc.authenticated) {
 5854                 /* "silently" ignore */
 5855                 SCTP_STAT_INCR(sctps_recvauthmissing);
 5856                 SCTPDBG(SCTP_DEBUG_AUTH1,
 5857                     "Data chunk requires AUTH, skipped\n");
 5858                 goto trigger_send;
 5859         }
 5860         if (length > offset) {
 5861                 int retval;
 5862 
 5863                 /*
 5864                  * First check to make sure our state is correct. We would
 5865                  * not get here unless we really did have a tag, so we don't
 5866                  * abort if this happens, just dump the chunk silently.
 5867                  */
 5868                 switch (SCTP_GET_STATE(&stcb->asoc)) {
 5869                 case SCTP_STATE_COOKIE_ECHOED:
 5870                         /*
 5871                          * we consider data with valid tags in this state
 5872                          * shows us the cookie-ack was lost. Imply it was
 5873                          * there.
 5874                          */
 5875                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5876                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5877                                     stcb->asoc.overall_error_count,
 5878                                     0,
 5879                                     SCTP_FROM_SCTP_INPUT,
 5880                                     __LINE__);
 5881                         }
 5882                         stcb->asoc.overall_error_count = 0;
 5883                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
 5884                         break;
 5885                 case SCTP_STATE_COOKIE_WAIT:
 5886                         /*
 5887                          * We consider OOTB any data sent during asoc setup.
 5888                          */
 5889                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
 5890                             use_mflowid, mflowid,
 5891                             vrf_id, port);
 5892                         goto out;
 5893                         /* sa_ignore NOTREACHED */
 5894                         break;
 5895                 case SCTP_STATE_EMPTY:  /* should not happen */
 5896                 case SCTP_STATE_INUSE:  /* should not happen */
 5897                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
 5898                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
 5899                 default:
 5900                         goto out;
 5901                         /* sa_ignore NOTREACHED */
 5902                         break;
 5903                 case SCTP_STATE_OPEN:
 5904                 case SCTP_STATE_SHUTDOWN_SENT:
 5905                         break;
 5906                 }
 5907                 /* plow through the data chunks while length > offset */
 5908                 retval = sctp_process_data(mm, iphlen, &offset, length,
 5909                     src, dst, sh,
 5910                     inp, stcb, net, &high_tsn,
 5911                     use_mflowid, mflowid,
 5912                     vrf_id, port);
 5913                 if (retval == 2) {
 5914                         /*
 5915                          * The association aborted, NO UNLOCK needed since
 5916                          * the association is destroyed.
 5917                          */
 5918                         stcb = NULL;
 5919                         goto out;
 5920                 }
 5921                 data_processed = 1;
 5922                 /*
 5923                  * Anything important needs to have been m_copy'ed in
 5924                  * process_data
 5925                  */
 5926         }
 5927         /* take care of ecn */
 5928         if ((data_processed == 1) &&
 5929             (stcb->asoc.ecn_allowed == 1) &&
 5930             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
 5931                 /* Yep, we need to add a ECNE */
 5932                 sctp_send_ecn_echo(stcb, net, high_tsn);
 5933         }
 5934         if ((data_processed == 0) && (fwd_tsn_seen)) {
 5935                 int was_a_gap;
 5936                 uint32_t highest_tsn;
 5937 
 5938                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
 5939                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
 5940                 } else {
 5941                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
 5942                 }
 5943                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
 5944                 stcb->asoc.send_sack = 1;
 5945                 sctp_sack_check(stcb, was_a_gap);
 5946         } else if (fwd_tsn_seen) {
 5947                 stcb->asoc.send_sack = 1;
 5948         }
 5949         /* trigger send of any chunks in queue... */
 5950 trigger_send:
 5951 #ifdef SCTP_AUDITING_ENABLED
 5952         sctp_audit_log(0xE0, 2);
 5953         sctp_auditing(1, inp, stcb, net);
 5954 #endif
 5955         SCTPDBG(SCTP_DEBUG_INPUT1,
 5956             "Check for chunk output prw:%d tqe:%d tf=%d\n",
 5957             stcb->asoc.peers_rwnd,
 5958             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
 5959             stcb->asoc.total_flight);
 5960         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
 5961         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
 5962                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
 5963         }
 5964         if (cnt_ctrl_ready ||
 5965             ((un_sent) &&
 5966             (stcb->asoc.peers_rwnd > 0 ||
 5967             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
 5968                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
 5969                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 5970                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
 5971         }
 5972 #ifdef SCTP_AUDITING_ENABLED
 5973         sctp_audit_log(0xE0, 3);
 5974         sctp_auditing(2, inp, stcb, net);
 5975 #endif
 5976 out:
 5977         if (stcb != NULL) {
 5978                 SCTP_TCB_UNLOCK(stcb);
 5979         }
 5980         if (inp_decr != NULL) {
 5981                 /* reduce ref-count */
 5982                 SCTP_INP_WLOCK(inp_decr);
 5983                 SCTP_INP_DECR_REF(inp_decr);
 5984                 SCTP_INP_WUNLOCK(inp_decr);
 5985         }
 5986 #ifdef INVARIANTS
 5987         if (inp != NULL) {
 5988                 sctp_validate_no_locks(inp);
 5989         }
 5990 #endif
 5991         return;
 5992 }
 5993 
 5994 #if 0
 5995 static void
 5996 sctp_print_mbuf_chain(struct mbuf *m)
 5997 {
 5998         for (; m; m = SCTP_BUF_NEXT(m)) {
 5999                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
 6000                 if (SCTP_BUF_IS_EXTENDED(m))
 6001                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
 6002         }
 6003 }
 6004 
 6005 #endif
 6006 
 6007 #ifdef INET
 6008 void
 6009 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
 6010 {
 6011         struct mbuf *m;
 6012         int iphlen;
 6013         uint32_t vrf_id = 0;
 6014         uint8_t ecn_bits;
 6015         struct sockaddr_in src, dst;
 6016         struct ip *ip;
 6017         struct sctphdr *sh;
 6018         struct sctp_chunkhdr *ch;
 6019         int length, offset;
 6020 
 6021 #if !defined(SCTP_WITH_NO_CSUM)
 6022         uint8_t compute_crc;
 6023 
 6024 #endif
 6025         uint32_t mflowid;
 6026         uint8_t use_mflowid;
 6027 
 6028         iphlen = off;
 6029         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
 6030                 SCTP_RELEASE_PKT(i_pak);
 6031                 return;
 6032         }
 6033         m = SCTP_HEADER_TO_CHAIN(i_pak);
 6034 #ifdef SCTP_MBUF_LOGGING
 6035         /* Log in any input mbufs */
 6036         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6037                 struct mbuf *mat;
 6038 
 6039                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
 6040                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 6041                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
 6042                         }
 6043                 }
 6044         }
 6045 #endif
 6046 #ifdef SCTP_PACKET_LOGGING
 6047         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 6048                 sctp_packet_log(m);
 6049         }
 6050 #endif
 6051         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 6052             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 6053             m->m_pkthdr.len,
 6054             if_name(m->m_pkthdr.rcvif),
 6055             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 6056         if (m->m_flags & M_FLOWID) {
 6057                 mflowid = m->m_pkthdr.flowid;
 6058                 use_mflowid = 1;
 6059         } else {
 6060                 mflowid = 0;