The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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/11.2/sys/netinet/sctp_input.c 334802 2018-06-07 18:01:31Z tuexen $");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <netinet/sctp_var.h>
   38 #include <netinet/sctp_sysctl.h>
   39 #include <netinet/sctp_pcb.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctputil.h>
   42 #include <netinet/sctp_output.h>
   43 #include <netinet/sctp_input.h>
   44 #include <netinet/sctp_auth.h>
   45 #include <netinet/sctp_indata.h>
   46 #include <netinet/sctp_asconf.h>
   47 #include <netinet/sctp_bsd_addr.h>
   48 #include <netinet/sctp_timer.h>
   49 #include <netinet/sctp_crc32.h>
   50 #if defined(INET) || defined(INET6)
   51 #include <netinet/udp.h>
   52 #endif
   53 #include <sys/smp.h>
   54 
   55 
   56 
   57 static void
   58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
   59 {
   60         struct sctp_nets *net;
   61 
   62         /*
   63          * This now not only stops all cookie timers it also stops any INIT
   64          * timers as well. This will make sure that the timers are stopped
   65          * in all collision cases.
   66          */
   67         SCTP_TCB_LOCK_ASSERT(stcb);
   68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
   69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
   70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
   71                             stcb->sctp_ep,
   72                             stcb,
   73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
   74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
   75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
   76                             stcb->sctp_ep,
   77                             stcb,
   78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
   79                 }
   80         }
   81 }
   82 
   83 /* INIT handler */
   84 static void
   85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
   86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
   87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
   88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
   89     uint8_t mflowtype, uint32_t mflowid,
   90     uint32_t vrf_id, uint16_t port)
   91 {
   92         struct sctp_init *init;
   93         struct mbuf *op_err;
   94 
   95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
   96             (void *)stcb);
   97         if (stcb == NULL) {
   98                 SCTP_INP_RLOCK(inp);
   99         }
  100         /* validate length */
  101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
  102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  104                     mflowtype, mflowid,
  105                     vrf_id, port);
  106                 if (stcb)
  107                         *abort_no_unlock = 1;
  108                 goto outnow;
  109         }
  110         /* validate parameters */
  111         init = &cp->init;
  112         if (init->initiate_tag == 0) {
  113                 /* protocol error... send abort */
  114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  116                     mflowtype, mflowid,
  117                     vrf_id, port);
  118                 if (stcb)
  119                         *abort_no_unlock = 1;
  120                 goto outnow;
  121         }
  122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
  123                 /* invalid parameter... send abort */
  124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  126                     mflowtype, mflowid,
  127                     vrf_id, port);
  128                 if (stcb)
  129                         *abort_no_unlock = 1;
  130                 goto outnow;
  131         }
  132         if (init->num_inbound_streams == 0) {
  133                 /* protocol error... send abort */
  134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  136                     mflowtype, mflowid,
  137                     vrf_id, port);
  138                 if (stcb)
  139                         *abort_no_unlock = 1;
  140                 goto outnow;
  141         }
  142         if (init->num_outbound_streams == 0) {
  143                 /* protocol error... send abort */
  144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
  145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  146                     mflowtype, mflowid,
  147                     vrf_id, port);
  148                 if (stcb)
  149                         *abort_no_unlock = 1;
  150                 goto outnow;
  151         }
  152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
  153             offset + ntohs(cp->ch.chunk_length))) {
  154                 /* auth parameter(s) error... send abort */
  155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  156                     "Problem with AUTH parameters");
  157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
  158                     mflowtype, mflowid,
  159                     vrf_id, port);
  160                 if (stcb)
  161                         *abort_no_unlock = 1;
  162                 goto outnow;
  163         }
  164         /* We are only accepting if we have a socket with positive
  165          * so_qlimit. */
  166         if ((stcb == NULL) &&
  167             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
  168             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
  169             (inp->sctp_socket == NULL) ||
  170             (inp->sctp_socket->so_qlimit == 0))) {
  171                 /*
  172                  * FIX ME ?? What about TCP model and we have a
  173                  * match/restart case? Actually no fix is needed. the lookup
  174                  * will always find the existing assoc so stcb would not be
  175                  * NULL. It may be questionable to do this since we COULD
  176                  * just send back the INIT-ACK and hope that the app did
  177                  * accept()'s by the time the COOKIE was sent. But there is
  178                  * a price to pay for COOKIE generation and I don't want to
  179                  * pay it on the chance that the app will actually do some
  180                  * accepts(). The App just looses and should NOT be in this
  181                  * state :-)
  182                  */
  183                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
  184                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  185                             "No listener");
  186                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
  187                             mflowtype, mflowid, inp->fibnum,
  188                             vrf_id, port);
  189                 }
  190                 goto outnow;
  191         }
  192         if ((stcb != NULL) &&
  193             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
  194                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
  195                 sctp_send_shutdown_ack(stcb, NULL);
  196                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
  197         } else {
  198                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
  199                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
  200                     src, dst, sh, cp,
  201                     mflowtype, mflowid,
  202                     vrf_id, port);
  203         }
  204 outnow:
  205         if (stcb == NULL) {
  206                 SCTP_INP_RUNLOCK(inp);
  207         }
  208 }
  209 
  210 /*
  211  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
  212  */
  213 
  214 int
  215 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
  216 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
  217     SCTP_UNUSED
  218 #endif
  219 )
  220 {
  221         int unsent_data;
  222         unsigned int i;
  223         struct sctp_stream_queue_pending *sp;
  224         struct sctp_association *asoc;
  225 
  226         /*
  227          * This function returns if any stream has true unsent data on it.
  228          * Note that as it looks through it will clean up any places that
  229          * have old data that has been sent but left at top of stream queue.
  230          */
  231         asoc = &stcb->asoc;
  232         unsent_data = 0;
  233         SCTP_TCB_SEND_LOCK(stcb);
  234         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
  235                 /* Check to see if some data queued */
  236                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
  237                         /* sa_ignore FREED_MEMORY */
  238                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
  239                         if (sp == NULL) {
  240                                 continue;
  241                         }
  242                         if ((sp->msg_is_complete) &&
  243                             (sp->length == 0) &&
  244                             (sp->sender_all_done)) {
  245                                 /*
  246                                  * We are doing differed cleanup. Last time
  247                                  * through when we took all the data the
  248                                  * sender_all_done was not set.
  249                                  */
  250                                 if (sp->put_last_out == 0) {
  251                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
  252                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
  253                                             sp->sender_all_done,
  254                                             sp->length,
  255                                             sp->msg_is_complete,
  256                                             sp->put_last_out);
  257                                 }
  258                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
  259                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
  260                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
  261                                 if (sp->net) {
  262                                         sctp_free_remote_addr(sp->net);
  263                                         sp->net = NULL;
  264                                 }
  265                                 if (sp->data) {
  266                                         sctp_m_freem(sp->data);
  267                                         sp->data = NULL;
  268                                 }
  269                                 sctp_free_a_strmoq(stcb, sp, so_locked);
  270                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
  271                                         unsent_data++;
  272                                 }
  273                         } else {
  274                                 unsent_data++;
  275                         }
  276                         if (unsent_data > 0) {
  277                                 break;
  278                         }
  279                 }
  280         }
  281         SCTP_TCB_SEND_UNLOCK(stcb);
  282         return (unsent_data);
  283 }
  284 
  285 static int
  286 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
  287 {
  288         struct sctp_init *init;
  289         struct sctp_association *asoc;
  290         struct sctp_nets *lnet;
  291         unsigned int i;
  292 
  293         init = &cp->init;
  294         asoc = &stcb->asoc;
  295         /* save off parameters */
  296         asoc->peer_vtag = ntohl(init->initiate_tag);
  297         asoc->peers_rwnd = ntohl(init->a_rwnd);
  298         /* init tsn's */
  299         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
  300 
  301         if (!TAILQ_EMPTY(&asoc->nets)) {
  302                 /* update any ssthresh's that may have a default */
  303                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
  304                         lnet->ssthresh = asoc->peers_rwnd;
  305                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
  306                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
  307                         }
  308                 }
  309         }
  310         SCTP_TCB_SEND_LOCK(stcb);
  311         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
  312                 unsigned int newcnt;
  313                 struct sctp_stream_out *outs;
  314                 struct sctp_stream_queue_pending *sp, *nsp;
  315                 struct sctp_tmit_chunk *chk, *nchk;
  316 
  317                 /* abandon the upper streams */
  318                 newcnt = ntohs(init->num_inbound_streams);
  319                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
  320                         if (chk->rec.data.sid >= newcnt) {
  321                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
  322                                 asoc->send_queue_cnt--;
  323                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
  324                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
  325 #ifdef INVARIANTS
  326                                 } else {
  327                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
  328 #endif
  329                                 }
  330                                 if (chk->data != NULL) {
  331                                         sctp_free_bufspace(stcb, asoc, chk, 1);
  332                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
  333                                             0, chk, SCTP_SO_NOT_LOCKED);
  334                                         if (chk->data) {
  335                                                 sctp_m_freem(chk->data);
  336                                                 chk->data = NULL;
  337                                         }
  338                                 }
  339                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  340                                 /* sa_ignore FREED_MEMORY */
  341                         }
  342                 }
  343                 if (asoc->strmout) {
  344                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
  345                                 outs = &asoc->strmout[i];
  346                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
  347                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
  348                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
  349                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
  350                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
  351                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
  352                                         if (sp->data) {
  353                                                 sctp_m_freem(sp->data);
  354                                                 sp->data = NULL;
  355                                         }
  356                                         if (sp->net) {
  357                                                 sctp_free_remote_addr(sp->net);
  358                                                 sp->net = NULL;
  359                                         }
  360                                         /* Free the chunk */
  361                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
  362                                         /* sa_ignore FREED_MEMORY */
  363                                 }
  364                                 outs->state = SCTP_STREAM_CLOSED;
  365                         }
  366                 }
  367                 /* cut back the count */
  368                 asoc->pre_open_streams = newcnt;
  369         }
  370         SCTP_TCB_SEND_UNLOCK(stcb);
  371         asoc->streamoutcnt = asoc->pre_open_streams;
  372         if (asoc->strmout) {
  373                 for (i = 0; i < asoc->streamoutcnt; i++) {
  374                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
  375                 }
  376         }
  377         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
  378         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
  379         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
  380                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
  381         }
  382         /* This is the next one we expect */
  383         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
  384 
  385         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
  386         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
  387 
  388         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
  389         /* open the requested streams */
  390 
  391         if (asoc->strmin != NULL) {
  392                 /* Free the old ones */
  393                 for (i = 0; i < asoc->streamincnt; i++) {
  394                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
  395                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
  396                 }
  397                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
  398         }
  399         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
  400                 asoc->streamincnt = ntohs(init->num_outbound_streams);
  401         } else {
  402                 asoc->streamincnt = asoc->max_inbound_streams;
  403         }
  404         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
  405             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
  406         if (asoc->strmin == NULL) {
  407                 /* we didn't get memory for the streams! */
  408                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
  409                 return (-1);
  410         }
  411         for (i = 0; i < asoc->streamincnt; i++) {
  412                 asoc->strmin[i].sid = i;
  413                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
  414                 TAILQ_INIT(&asoc->strmin[i].inqueue);
  415                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
  416                 asoc->strmin[i].pd_api_started = 0;
  417                 asoc->strmin[i].delivery_started = 0;
  418         }
  419         /*
  420          * load_address_from_init will put the addresses into the
  421          * association when the COOKIE is processed or the INIT-ACK is
  422          * processed. Both types of COOKIE's existing and new call this
  423          * routine. It will remove addresses that are no longer in the
  424          * association (for the restarting case where addresses are
  425          * removed). Up front when the INIT arrives we will discard it if it
  426          * is a restart and new addresses have been added.
  427          */
  428         /* sa_ignore MEMLEAK */
  429         return (0);
  430 }
  431 
  432 /*
  433  * INIT-ACK message processing/consumption returns value < 0 on error
  434  */
  435 static int
  436 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
  437     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  438     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
  439     struct sctp_nets *net, int *abort_no_unlock,
  440     uint8_t mflowtype, uint32_t mflowid,
  441     uint32_t vrf_id)
  442 {
  443         struct sctp_association *asoc;
  444         struct mbuf *op_err;
  445         int retval, abort_flag;
  446         uint32_t initack_limit;
  447         int nat_friendly = 0;
  448 
  449         /* First verify that we have no illegal param's */
  450         abort_flag = 0;
  451 
  452         op_err = sctp_arethere_unrecognized_parameters(m,
  453             (offset + sizeof(struct sctp_init_chunk)),
  454             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
  455         if (abort_flag) {
  456                 /* Send an abort and notify peer */
  457                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
  458                 *abort_no_unlock = 1;
  459                 return (-1);
  460         }
  461         asoc = &stcb->asoc;
  462         asoc->peer_supports_nat = (uint8_t)nat_friendly;
  463         /* process the peer's parameters in the INIT-ACK */
  464         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
  465         if (retval < 0) {
  466                 return (retval);
  467         }
  468         initack_limit = offset + ntohs(cp->ch.chunk_length);
  469         /* load all addresses */
  470         if ((retval = sctp_load_addresses_from_init(stcb, m,
  471             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
  472             src, dst, NULL, stcb->asoc.port))) {
  473                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  474                     "Problem with address parameters");
  475                 SCTPDBG(SCTP_DEBUG_INPUT1,
  476                     "Load addresses from INIT causes an abort %d\n",
  477                     retval);
  478                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
  479                     src, dst, sh, op_err,
  480                     mflowtype, mflowid,
  481                     vrf_id, net->port);
  482                 *abort_no_unlock = 1;
  483                 return (-1);
  484         }
  485         /* if the peer doesn't support asconf, flush the asconf queue */
  486         if (asoc->asconf_supported == 0) {
  487                 struct sctp_asconf_addr *param, *nparam;
  488 
  489                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
  490                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
  491                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
  492                 }
  493         }
  494         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
  495             stcb->asoc.local_hmacs);
  496         if (op_err) {
  497                 sctp_queue_op_err(stcb, op_err);
  498                 /* queuing will steal away the mbuf chain to the out queue */
  499                 op_err = NULL;
  500         }
  501         /* extract the cookie and queue it to "echo" it back... */
  502         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  503                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
  504                     stcb->asoc.overall_error_count,
  505                     0,
  506                     SCTP_FROM_SCTP_INPUT,
  507                     __LINE__);
  508         }
  509         stcb->asoc.overall_error_count = 0;
  510         net->error_count = 0;
  511 
  512         /*
  513          * Cancel the INIT timer, We do this first before queueing the
  514          * cookie. We always cancel at the primary to assue that we are
  515          * canceling the timer started by the INIT which always goes to the
  516          * primary.
  517          */
  518         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
  519             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
  520 
  521         /* calculate the RTO */
  522         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
  523             SCTP_RTT_FROM_NON_DATA);
  524         retval = sctp_send_cookie_echo(m, offset, stcb, net);
  525         if (retval < 0) {
  526                 /*
  527                  * No cookie, we probably should send a op error. But in any
  528                  * case if there is no cookie in the INIT-ACK, we can
  529                  * abandon the peer, its broke.
  530                  */
  531                 if (retval == -3) {
  532                         uint16_t len;
  533 
  534                         len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
  535                         /* We abort with an error of missing mandatory param */
  536                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
  537                         if (op_err != NULL) {
  538                                 struct sctp_error_missing_param *cause;
  539 
  540                                 SCTP_BUF_LEN(op_err) = len;
  541                                 cause = mtod(op_err, struct sctp_error_missing_param *);
  542                                 /* Subtract the reserved param */
  543                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
  544                                 cause->cause.length = htons(len);
  545                                 cause->num_missing_params = htonl(1);
  546                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
  547                         }
  548                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
  549                             src, dst, sh, op_err,
  550                             mflowtype, mflowid,
  551                             vrf_id, net->port);
  552                         *abort_no_unlock = 1;
  553                 }
  554                 return (retval);
  555         }
  556         return (0);
  557 }
  558 
  559 static void
  560 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
  561     struct sctp_tcb *stcb, struct sctp_nets *net)
  562 {
  563         union sctp_sockstore store;
  564         struct sctp_nets *r_net, *f_net;
  565         struct timeval tv;
  566         int req_prim = 0;
  567         uint16_t old_error_counter;
  568 
  569         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
  570                 /* Invalid length */
  571                 return;
  572         }
  573         memset(&store, 0, sizeof(store));
  574         switch (cp->heartbeat.hb_info.addr_family) {
  575 #ifdef INET
  576         case AF_INET:
  577                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
  578                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
  579                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
  580                         store.sin.sin_port = stcb->rport;
  581                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
  582                             sizeof(store.sin.sin_addr));
  583                 } else {
  584                         return;
  585                 }
  586                 break;
  587 #endif
  588 #ifdef INET6
  589         case AF_INET6:
  590                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
  591                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
  592                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
  593                         store.sin6.sin6_port = stcb->rport;
  594                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
  595                 } else {
  596                         return;
  597                 }
  598                 break;
  599 #endif
  600         default:
  601                 return;
  602         }
  603         r_net = sctp_findnet(stcb, &store.sa);
  604         if (r_net == NULL) {
  605                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
  606                 return;
  607         }
  608         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  609             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
  610             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
  611                 /*
  612                  * If the its a HB and it's random value is correct when can
  613                  * confirm the destination.
  614                  */
  615                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
  616                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
  617                         stcb->asoc.primary_destination = r_net;
  618                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  619                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
  620                         if (f_net != r_net) {
  621                                 /*
  622                                  * first one on the list is NOT the primary
  623                                  * sctp_cmpaddr() is much more efficient if
  624                                  * the primary is the first on the list,
  625                                  * make it so.
  626                                  */
  627                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
  628                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
  629                         }
  630                         req_prim = 1;
  631                 }
  632                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
  633                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
  634                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
  635                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
  636                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
  637         }
  638         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  639                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
  640                     stcb->asoc.overall_error_count,
  641                     0,
  642                     SCTP_FROM_SCTP_INPUT,
  643                     __LINE__);
  644         }
  645         stcb->asoc.overall_error_count = 0;
  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,
  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,
  665                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
  666                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
  667         }
  668         if (r_net == stcb->asoc.primary_destination) {
  669                 if (stcb->asoc.alternate) {
  670                         /* release the alternate, primary is good */
  671                         sctp_free_remote_addr(stcb->asoc.alternate);
  672                         stcb->asoc.alternate = NULL;
  673                 }
  674         }
  675         /* Mobility adaptation */
  676         if (req_prim) {
  677                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
  678                     SCTP_MOBILITY_BASE) ||
  679                     sctp_is_mobility_feature_on(stcb->sctp_ep,
  680                     SCTP_MOBILITY_FASTHANDOFF)) &&
  681                     sctp_is_mobility_feature_on(stcb->sctp_ep,
  682                     SCTP_MOBILITY_PRIM_DELETED)) {
  683 
  684                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
  685                             stcb->sctp_ep, stcb, NULL,
  686                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
  687                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
  688                             SCTP_MOBILITY_FASTHANDOFF)) {
  689                                 sctp_assoc_immediate_retrans(stcb,
  690                                     stcb->asoc.primary_destination);
  691                         }
  692                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
  693                             SCTP_MOBILITY_BASE)) {
  694                                 sctp_move_chunks_from_net(stcb,
  695                                     stcb->asoc.deleted_primary);
  696                         }
  697                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
  698                             stcb->asoc.deleted_primary);
  699                 }
  700         }
  701 }
  702 
  703 static int
  704 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
  705 {
  706         /*
  707          * return 0 means we want you to proceed with the abort non-zero
  708          * means no abort processing
  709          */
  710         struct sctpasochead *head;
  711 
  712         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) ||
  713             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
  714                 atomic_add_int(&stcb->asoc.refcnt, 1);
  715                 SCTP_TCB_UNLOCK(stcb);
  716                 SCTP_INP_INFO_WLOCK();
  717                 SCTP_TCB_LOCK(stcb);
  718                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  719         }
  720         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
  721                 /* generate a new vtag and send init */
  722                 LIST_REMOVE(stcb, sctp_asocs);
  723                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
  724                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
  725                 /*
  726                  * put it in the bucket in the vtag hash of assoc's for the
  727                  * system
  728                  */
  729                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
  730                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
  731                 SCTP_INP_INFO_WUNLOCK();
  732                 return (1);
  733         }
  734         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  735                 /*
  736                  * treat like a case where the cookie expired i.e.: - dump
  737                  * current cookie. - generate a new vtag. - resend init.
  738                  */
  739                 /* generate a new vtag and send init */
  740                 LIST_REMOVE(stcb, sctp_asocs);
  741                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
  742                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
  743                 sctp_stop_all_cookie_timers(stcb);
  744                 sctp_toss_old_cookies(stcb, &stcb->asoc);
  745                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
  746                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
  747                 /*
  748                  * put it in the bucket in the vtag hash of assoc's for the
  749                  * system
  750                  */
  751                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
  752                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
  753                 SCTP_INP_INFO_WUNLOCK();
  754                 return (1);
  755         }
  756         return (0);
  757 }
  758 
  759 static int
  760 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
  761     struct sctp_nets *net)
  762 {
  763         /*
  764          * return 0 means we want you to proceed with the abort non-zero
  765          * means no abort processing
  766          */
  767         if (stcb->asoc.auth_supported == 0) {
  768                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
  769                 return (0);
  770         }
  771         sctp_asconf_send_nat_state_update(stcb, net);
  772         return (1);
  773 }
  774 
  775 
  776 /* Returns 1 if the stcb was aborted, 0 otherwise */
  777 static int
  778 sctp_handle_abort(struct sctp_abort_chunk *abort,
  779     struct sctp_tcb *stcb, struct sctp_nets *net)
  780 {
  781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  782         struct socket *so;
  783 #endif
  784         uint16_t len;
  785         uint16_t error;
  786 
  787         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
  788         if (stcb == NULL)
  789                 return (0);
  790 
  791         len = ntohs(abort->ch.chunk_length);
  792         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
  793                 /*
  794                  * Need to check the cause codes for our two magic nat
  795                  * aborts which don't kill the assoc necessarily.
  796                  */
  797                 struct sctp_error_cause *cause;
  798 
  799                 cause = (struct sctp_error_cause *)(abort + 1);
  800                 error = ntohs(cause->code);
  801                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
  802                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
  803                             abort->ch.chunk_flags);
  804                         if (sctp_handle_nat_colliding_state(stcb)) {
  805                                 return (0);
  806                         }
  807                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
  808                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
  809                             abort->ch.chunk_flags);
  810                         if (sctp_handle_nat_missing_state(stcb, net)) {
  811                                 return (0);
  812                         }
  813                 }
  814         } else {
  815                 error = 0;
  816         }
  817         /* stop any receive timers */
  818         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
  819             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
  820         /* notify user of the abort and clean up... */
  821         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
  822         /* free the tcb */
  823         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
  824         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
  825             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  826                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  827         }
  828 #ifdef SCTP_ASOCLOG_OF_TSNS
  829         sctp_print_out_track_log(stcb);
  830 #endif
  831 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  832         so = SCTP_INP_SO(stcb->sctp_ep);
  833         atomic_add_int(&stcb->asoc.refcnt, 1);
  834         SCTP_TCB_UNLOCK(stcb);
  835         SCTP_SOCKET_LOCK(so, 1);
  836         SCTP_TCB_LOCK(stcb);
  837         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  838 #endif
  839         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
  840         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
  841             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
  842 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  843         SCTP_SOCKET_UNLOCK(so, 1);
  844 #endif
  845         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
  846         return (1);
  847 }
  848 
  849 static void
  850 sctp_start_net_timers(struct sctp_tcb *stcb)
  851 {
  852         uint32_t cnt_hb_sent;
  853         struct sctp_nets *net;
  854 
  855         cnt_hb_sent = 0;
  856         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  857                 /*
  858                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
  859                  * If the dest in unconfirmed send a hb as well if under
  860                  * max_hb_burst have been sent.
  861                  */
  862                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
  863                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
  864                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
  865                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
  866                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  867                         cnt_hb_sent++;
  868                 }
  869         }
  870         if (cnt_hb_sent) {
  871                 sctp_chunk_output(stcb->sctp_ep, stcb,
  872                     SCTP_OUTPUT_FROM_COOKIE_ACK,
  873                     SCTP_SO_NOT_LOCKED);
  874         }
  875 }
  876 
  877 
  878 static void
  879 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
  880     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
  881 {
  882         struct sctp_association *asoc;
  883         int some_on_streamwheel;
  884         int old_state;
  885 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  886         struct socket *so;
  887 #endif
  888 
  889         SCTPDBG(SCTP_DEBUG_INPUT2,
  890             "sctp_handle_shutdown: handling SHUTDOWN\n");
  891         if (stcb == NULL)
  892                 return;
  893         asoc = &stcb->asoc;
  894         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
  895             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
  896                 return;
  897         }
  898         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
  899                 /* Shutdown NOT the expected size */
  900                 return;
  901         }
  902         old_state = SCTP_GET_STATE(asoc);
  903         sctp_update_acked(stcb, cp, abort_flag);
  904         if (*abort_flag) {
  905                 return;
  906         }
  907         if (asoc->control_pdapi) {
  908                 /*
  909                  * With a normal shutdown we assume the end of last record.
  910                  */
  911                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
  912                 if (asoc->control_pdapi->on_strm_q) {
  913                         struct sctp_stream_in *strm;
  914 
  915                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
  916                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
  917                                 /* Unordered */
  918                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
  919                                 asoc->control_pdapi->on_strm_q = 0;
  920                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
  921                                 /* Ordered */
  922                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
  923                                 asoc->control_pdapi->on_strm_q = 0;
  924 #ifdef INVARIANTS
  925                         } else {
  926                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
  927                                     asoc->control_pdapi,
  928                                     asoc->control_pdapi->on_strm_q);
  929 #endif
  930                         }
  931                 }
  932                 asoc->control_pdapi->end_added = 1;
  933                 asoc->control_pdapi->pdapi_aborted = 1;
  934                 asoc->control_pdapi = NULL;
  935                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
  936 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  937                 so = SCTP_INP_SO(stcb->sctp_ep);
  938                 atomic_add_int(&stcb->asoc.refcnt, 1);
  939                 SCTP_TCB_UNLOCK(stcb);
  940                 SCTP_SOCKET_LOCK(so, 1);
  941                 SCTP_TCB_LOCK(stcb);
  942                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  943                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
  944                         /* assoc was freed while we were unlocked */
  945                         SCTP_SOCKET_UNLOCK(so, 1);
  946                         return;
  947                 }
  948 #endif
  949                 if (stcb->sctp_socket) {
  950                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
  951                 }
  952 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  953                 SCTP_SOCKET_UNLOCK(so, 1);
  954 #endif
  955         }
  956         /* goto SHUTDOWN_RECEIVED state to block new requests */
  957         if (stcb->sctp_socket) {
  958                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
  959                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
  960                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
  961                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
  962                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  963                         /*
  964                          * notify upper layer that peer has initiated a
  965                          * shutdown
  966                          */
  967                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
  968 
  969                         /* reset time */
  970                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
  971                 }
  972         }
  973         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
  974                 /*
  975                  * stop the shutdown timer, since we WILL move to
  976                  * SHUTDOWN-ACK-SENT.
  977                  */
  978                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
  979                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
  980         }
  981         /* Now is there unsent data on a stream somewhere? */
  982         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
  983 
  984         if (!TAILQ_EMPTY(&asoc->send_queue) ||
  985             !TAILQ_EMPTY(&asoc->sent_queue) ||
  986             some_on_streamwheel) {
  987                 /* By returning we will push more data out */
  988                 return;
  989         } else {
  990                 /* no outstanding data to send, so move on... */
  991                 /* send SHUTDOWN-ACK */
  992                 /* move to SHUTDOWN-ACK-SENT state */
  993                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
  994                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
  995                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
  996                 }
  997                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
  998                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
  999                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 1000                         sctp_stop_timers_for_shutdown(stcb);
 1001                         sctp_send_shutdown_ack(stcb, net);
 1002                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 1003                             stcb->sctp_ep, stcb, net);
 1004                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 1005                         sctp_send_shutdown_ack(stcb, net);
 1006                 }
 1007         }
 1008 }
 1009 
 1010 static void
 1011 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 1012     struct sctp_tcb *stcb,
 1013     struct sctp_nets *net)
 1014 {
 1015         struct sctp_association *asoc;
 1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1017         struct socket *so;
 1018 
 1019         so = SCTP_INP_SO(stcb->sctp_ep);
 1020 #endif
 1021         SCTPDBG(SCTP_DEBUG_INPUT2,
 1022             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 1023         if (stcb == NULL)
 1024                 return;
 1025 
 1026         asoc = &stcb->asoc;
 1027         /* process according to association state */
 1028         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 1029             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 1030                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 1031                 sctp_send_shutdown_complete(stcb, net, 1);
 1032                 SCTP_TCB_UNLOCK(stcb);
 1033                 return;
 1034         }
 1035         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 1036             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 1037                 /* unexpected SHUTDOWN-ACK... so ignore... */
 1038                 SCTP_TCB_UNLOCK(stcb);
 1039                 return;
 1040         }
 1041         if (asoc->control_pdapi) {
 1042                 /*
 1043                  * With a normal shutdown we assume the end of last record.
 1044                  */
 1045                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 1046                 asoc->control_pdapi->end_added = 1;
 1047                 asoc->control_pdapi->pdapi_aborted = 1;
 1048                 asoc->control_pdapi = NULL;
 1049                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 1050 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1051                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1052                 SCTP_TCB_UNLOCK(stcb);
 1053                 SCTP_SOCKET_LOCK(so, 1);
 1054                 SCTP_TCB_LOCK(stcb);
 1055                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1056                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1057                         /* assoc was freed while we were unlocked */
 1058                         SCTP_SOCKET_UNLOCK(so, 1);
 1059                         return;
 1060                 }
 1061 #endif
 1062                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 1063 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1064                 SCTP_SOCKET_UNLOCK(so, 1);
 1065 #endif
 1066         }
 1067 #ifdef INVARIANTS
 1068         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 1069             !TAILQ_EMPTY(&asoc->sent_queue) ||
 1070             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
 1071                 panic("Queues are not empty when handling SHUTDOWN-ACK");
 1072         }
 1073 #endif
 1074         /* stop the timer */
 1075         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
 1076             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 1077         /* send SHUTDOWN-COMPLETE */
 1078         sctp_send_shutdown_complete(stcb, net, 0);
 1079         /* notify upper layer protocol */
 1080         if (stcb->sctp_socket) {
 1081                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1082                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 1083                         stcb->sctp_socket->so_snd.sb_cc = 0;
 1084                 }
 1085                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 1086         }
 1087         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 1088         /* free the TCB but first save off the ep */
 1089 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1090         atomic_add_int(&stcb->asoc.refcnt, 1);
 1091         SCTP_TCB_UNLOCK(stcb);
 1092         SCTP_SOCKET_LOCK(so, 1);
 1093         SCTP_TCB_LOCK(stcb);
 1094         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1095 #endif
 1096         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 1097             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
 1098 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1099         SCTP_SOCKET_UNLOCK(so, 1);
 1100 #endif
 1101 }
 1102 
 1103 static void
 1104 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type,
 1105     struct sctp_nets *net)
 1106 {
 1107         switch (chunk_type) {
 1108         case SCTP_ASCONF_ACK:
 1109         case SCTP_ASCONF:
 1110                 sctp_asconf_cleanup(stcb, net);
 1111                 break;
 1112         case SCTP_IFORWARD_CUM_TSN:
 1113         case SCTP_FORWARD_CUM_TSN:
 1114                 stcb->asoc.prsctp_supported = 0;
 1115                 break;
 1116         default:
 1117                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1118                     "Peer does not support chunk type %d (0x%x).\n",
 1119                     chunk_type, chunk_type);
 1120                 break;
 1121         }
 1122 }
 1123 
 1124 /*
 1125  * Skip past the param header and then we will find the param that caused the
 1126  * problem.  There are a number of param's in a ASCONF OR the prsctp param
 1127  * these will turn of specific features.
 1128  * XXX: Is this the right thing to do?
 1129  */
 1130 static void
 1131 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
 1132 {
 1133         switch (parameter_type) {
 1134                 /* pr-sctp draft */
 1135         case SCTP_PRSCTP_SUPPORTED:
 1136                 stcb->asoc.prsctp_supported = 0;
 1137                 break;
 1138         case SCTP_SUPPORTED_CHUNK_EXT:
 1139                 break;
 1140                 /* draft-ietf-tsvwg-addip-sctp */
 1141         case SCTP_HAS_NAT_SUPPORT:
 1142                 stcb->asoc.peer_supports_nat = 0;
 1143                 break;
 1144         case SCTP_ADD_IP_ADDRESS:
 1145         case SCTP_DEL_IP_ADDRESS:
 1146         case SCTP_SET_PRIM_ADDR:
 1147                 stcb->asoc.asconf_supported = 0;
 1148                 break;
 1149         case SCTP_SUCCESS_REPORT:
 1150         case SCTP_ERROR_CAUSE_IND:
 1151                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
 1152                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1153                     "Turning off ASCONF to this strange peer\n");
 1154                 stcb->asoc.asconf_supported = 0;
 1155                 break;
 1156         default:
 1157                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1158                     "Peer does not support param type %d (0x%x)??\n",
 1159                     parameter_type, parameter_type);
 1160                 break;
 1161         }
 1162 }
 1163 
 1164 static int
 1165 sctp_handle_error(struct sctp_chunkhdr *ch,
 1166     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
 1167 {
 1168         struct sctp_error_cause *cause;
 1169         struct sctp_association *asoc;
 1170         uint32_t remaining_length, adjust;
 1171         uint16_t code, cause_code, cause_length;
 1172 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1173         struct socket *so;
 1174 #endif
 1175 
 1176         /* parse through all of the errors and process */
 1177         asoc = &stcb->asoc;
 1178         cause = (struct sctp_error_cause *)((caddr_t)ch +
 1179             sizeof(struct sctp_chunkhdr));
 1180         remaining_length = ntohs(ch->chunk_length);
 1181         if (remaining_length > limit) {
 1182                 remaining_length = limit;
 1183         }
 1184         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
 1185                 remaining_length -= sizeof(struct sctp_chunkhdr);
 1186         } else {
 1187                 remaining_length = 0;
 1188         }
 1189         code = 0;
 1190         while (remaining_length >= sizeof(struct sctp_error_cause)) {
 1191                 /* Process an Error Cause */
 1192                 cause_code = ntohs(cause->code);
 1193                 cause_length = ntohs(cause->length);
 1194                 if ((cause_length > remaining_length) || (cause_length == 0)) {
 1195                         /* Invalid cause length, possibly due to truncation. */
 1196                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
 1197                             remaining_length, cause_length);
 1198                         return (0);
 1199                 }
 1200                 if (code == 0) {
 1201                         /* report the first error cause */
 1202                         code = cause_code;
 1203                 }
 1204                 switch (cause_code) {
 1205                 case SCTP_CAUSE_INVALID_STREAM:
 1206                 case SCTP_CAUSE_MISSING_PARAM:
 1207                 case SCTP_CAUSE_INVALID_PARAM:
 1208                 case SCTP_CAUSE_NO_USER_DATA:
 1209                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
 1210                             cause_code);
 1211                         break;
 1212                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
 1213                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n",
 1214                             ch->chunk_flags);
 1215                         if (sctp_handle_nat_colliding_state(stcb)) {
 1216                                 return (0);
 1217                         }
 1218                         break;
 1219                 case SCTP_CAUSE_NAT_MISSING_STATE:
 1220                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n",
 1221                             ch->chunk_flags);
 1222                         if (sctp_handle_nat_missing_state(stcb, net)) {
 1223                                 return (0);
 1224                         }
 1225                         break;
 1226                 case SCTP_CAUSE_STALE_COOKIE:
 1227                         /*
 1228                          * We only act if we have echoed a cookie and are
 1229                          * waiting.
 1230                          */
 1231                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
 1232                             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 1233                                 struct sctp_error_stale_cookie *stale_cookie;
 1234 
 1235                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
 1236                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
 1237                                 /* Double it to be more robust on RTX */
 1238                                 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
 1239                                         asoc->cookie_preserve_req *= 2;
 1240                                 } else {
 1241                                         asoc->cookie_preserve_req = UINT32_MAX;
 1242                                 }
 1243                                 asoc->stale_cookie_count++;
 1244                                 if (asoc->stale_cookie_count >
 1245                                     asoc->max_init_times) {
 1246                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
 1247                                         /* now free the asoc */
 1248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1249                                         so = SCTP_INP_SO(stcb->sctp_ep);
 1250                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 1251                                         SCTP_TCB_UNLOCK(stcb);
 1252                                         SCTP_SOCKET_LOCK(so, 1);
 1253                                         SCTP_TCB_LOCK(stcb);
 1254                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1255 #endif
 1256                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 1257                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
 1258 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1259                                         SCTP_SOCKET_UNLOCK(so, 1);
 1260 #endif
 1261                                         return (-1);
 1262                                 }
 1263                                 /* blast back to INIT state */
 1264                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 1265                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
 1266                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
 1267                                 sctp_stop_all_cookie_timers(stcb);
 1268                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 1269                         }
 1270                         break;
 1271                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
 1272                         /*
 1273                          * Nothing we can do here, we don't do hostname
 1274                          * addresses so if the peer does not like my IPv6
 1275                          * (or IPv4 for that matter) it does not matter. If
 1276                          * they don't support that type of address, they can
 1277                          * NOT possibly get that packet type... i.e. with no
 1278                          * IPv6 you can't receive a IPv6 packet. so we can
 1279                          * safely ignore this one. If we ever added support
 1280                          * for HOSTNAME Addresses, then we would need to do
 1281                          * something here.
 1282                          */
 1283                         break;
 1284                 case SCTP_CAUSE_UNRECOG_CHUNK:
 1285                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
 1286                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
 1287 
 1288                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
 1289                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net);
 1290                         }
 1291                         break;
 1292                 case SCTP_CAUSE_UNRECOG_PARAM:
 1293                         /* XXX: We only consider the first parameter */
 1294                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
 1295                                 struct sctp_paramhdr *unrec_parameter;
 1296 
 1297                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
 1298                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
 1299                         }
 1300                         break;
 1301                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
 1302                         /*
 1303                          * We ignore this since the timer will drive out a
 1304                          * new cookie anyway and there timer will drive us
 1305                          * to send a SHUTDOWN_COMPLETE. We can't send one
 1306                          * here since we don't have their tag.
 1307                          */
 1308                         break;
 1309                 case SCTP_CAUSE_DELETING_LAST_ADDR:
 1310                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
 1311                 case SCTP_CAUSE_DELETING_SRC_ADDR:
 1312                         /*
 1313                          * We should NOT get these here, but in a
 1314                          * ASCONF-ACK.
 1315                          */
 1316                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
 1317                             cause_code);
 1318                         break;
 1319                 case SCTP_CAUSE_OUT_OF_RESC:
 1320                         /*
 1321                          * And what, pray tell do we do with the fact that
 1322                          * the peer is out of resources? Not really sure we
 1323                          * could do anything but abort. I suspect this
 1324                          * should have came WITH an abort instead of in a
 1325                          * OP-ERROR.
 1326                          */
 1327                         break;
 1328                 default:
 1329                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
 1330                             cause_code);
 1331                         break;
 1332                 }
 1333                 adjust = SCTP_SIZE32(cause_length);
 1334                 if (remaining_length >= adjust) {
 1335                         remaining_length -= adjust;
 1336                 } else {
 1337                         remaining_length = 0;
 1338                 }
 1339                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
 1340         }
 1341         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
 1342         return (0);
 1343 }
 1344 
 1345 static int
 1346 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
 1347     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 1348     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 1349     struct sctp_nets *net, int *abort_no_unlock,
 1350     uint8_t mflowtype, uint32_t mflowid,
 1351     uint32_t vrf_id)
 1352 {
 1353         struct sctp_init_ack *init_ack;
 1354         struct mbuf *op_err;
 1355 
 1356         SCTPDBG(SCTP_DEBUG_INPUT2,
 1357             "sctp_handle_init_ack: handling INIT-ACK\n");
 1358 
 1359         if (stcb == NULL) {
 1360                 SCTPDBG(SCTP_DEBUG_INPUT2,
 1361                     "sctp_handle_init_ack: TCB is null\n");
 1362                 return (-1);
 1363         }
 1364         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
 1365                 /* Invalid length */
 1366                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1367                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1368                     src, dst, sh, op_err,
 1369                     mflowtype, mflowid,
 1370                     vrf_id, net->port);
 1371                 *abort_no_unlock = 1;
 1372                 return (-1);
 1373         }
 1374         init_ack = &cp->init;
 1375         /* validate parameters */
 1376         if (init_ack->initiate_tag == 0) {
 1377                 /* protocol error... send an abort */
 1378                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1379                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1380                     src, dst, sh, op_err,
 1381                     mflowtype, mflowid,
 1382                     vrf_id, net->port);
 1383                 *abort_no_unlock = 1;
 1384                 return (-1);
 1385         }
 1386         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
 1387                 /* protocol error... send an abort */
 1388                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1389                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1390                     src, dst, sh, op_err,
 1391                     mflowtype, mflowid,
 1392                     vrf_id, net->port);
 1393                 *abort_no_unlock = 1;
 1394                 return (-1);
 1395         }
 1396         if (init_ack->num_inbound_streams == 0) {
 1397                 /* protocol error... send an abort */
 1398                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1399                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1400                     src, dst, sh, op_err,
 1401                     mflowtype, mflowid,
 1402                     vrf_id, net->port);
 1403                 *abort_no_unlock = 1;
 1404                 return (-1);
 1405         }
 1406         if (init_ack->num_outbound_streams == 0) {
 1407                 /* protocol error... send an abort */
 1408                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 1409                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 1410                     src, dst, sh, op_err,
 1411                     mflowtype, mflowid,
 1412                     vrf_id, net->port);
 1413                 *abort_no_unlock = 1;
 1414                 return (-1);
 1415         }
 1416         /* process according to association state... */
 1417         switch (stcb->asoc.state & SCTP_STATE_MASK) {
 1418         case SCTP_STATE_COOKIE_WAIT:
 1419                 /* this is the expected state for this chunk */
 1420                 /* process the INIT-ACK parameters */
 1421                 if (stcb->asoc.primary_destination->dest_state &
 1422                     SCTP_ADDR_UNCONFIRMED) {
 1423                         /*
 1424                          * The primary is where we sent the INIT, we can
 1425                          * always consider it confirmed when the INIT-ACK is
 1426                          * returned. Do this before we load addresses
 1427                          * though.
 1428                          */
 1429                         stcb->asoc.primary_destination->dest_state &=
 1430                             ~SCTP_ADDR_UNCONFIRMED;
 1431                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 1432                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
 1433                 }
 1434                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
 1435                     net, abort_no_unlock,
 1436                     mflowtype, mflowid,
 1437                     vrf_id) < 0) {
 1438                         /* error in parsing parameters */
 1439                         return (-1);
 1440                 }
 1441                 /* update our state */
 1442                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
 1443                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
 1444 
 1445                 /* reset the RTO calc */
 1446                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 1447                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 1448                             stcb->asoc.overall_error_count,
 1449                             0,
 1450                             SCTP_FROM_SCTP_INPUT,
 1451                             __LINE__);
 1452                 }
 1453                 stcb->asoc.overall_error_count = 0;
 1454                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 1455                 /*
 1456                  * collapse the init timer back in case of a exponential
 1457                  * backoff
 1458                  */
 1459                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
 1460                     stcb, net);
 1461                 /*
 1462                  * the send at the end of the inbound data processing will
 1463                  * cause the cookie to be sent
 1464                  */
 1465                 break;
 1466         case SCTP_STATE_SHUTDOWN_SENT:
 1467                 /* incorrect state... discard */
 1468                 break;
 1469         case SCTP_STATE_COOKIE_ECHOED:
 1470                 /* incorrect state... discard */
 1471                 break;
 1472         case SCTP_STATE_OPEN:
 1473                 /* incorrect state... discard */
 1474                 break;
 1475         case SCTP_STATE_EMPTY:
 1476         case SCTP_STATE_INUSE:
 1477         default:
 1478                 /* incorrect state... discard */
 1479                 return (-1);
 1480                 break;
 1481         }
 1482         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
 1483         return (0);
 1484 }
 1485 
 1486 static struct sctp_tcb *
 1487 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 1488     struct sockaddr *src, struct sockaddr *dst,
 1489     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 1490     struct sctp_inpcb *inp, struct sctp_nets **netp,
 1491     struct sockaddr *init_src, int *notification,
 1492     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 1493     uint8_t mflowtype, uint32_t mflowid,
 1494     uint32_t vrf_id, uint16_t port);
 1495 
 1496 
 1497 /*
 1498  * handle a state cookie for an existing association m: input packet mbuf
 1499  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
 1500  * "split" mbuf and the cookie signature does not exist offset: offset into
 1501  * mbuf to the cookie-echo chunk
 1502  */
 1503 static struct sctp_tcb *
 1504 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
 1505     struct sockaddr *src, struct sockaddr *dst,
 1506     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 1507     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
 1508     struct sockaddr *init_src, int *notification,
 1509     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 1510     uint8_t mflowtype, uint32_t mflowid,
 1511     uint32_t vrf_id, uint16_t port)
 1512 {
 1513         struct sctp_association *asoc;
 1514         struct sctp_init_chunk *init_cp, init_buf;
 1515         struct sctp_init_ack_chunk *initack_cp, initack_buf;
 1516         struct sctp_nets *net;
 1517         struct mbuf *op_err;
 1518         struct timeval old;
 1519         int init_offset, initack_offset, i;
 1520         int retval;
 1521         int spec_flag = 0;
 1522         uint32_t how_indx;
 1523 #if defined(SCTP_DETAILED_STR_STATS)
 1524         int j;
 1525 #endif
 1526 
 1527         net = *netp;
 1528         /* I know that the TCB is non-NULL from the caller */
 1529         asoc = &stcb->asoc;
 1530         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
 1531                 if (asoc->cookie_how[how_indx] == 0)
 1532                         break;
 1533         }
 1534         if (how_indx < sizeof(asoc->cookie_how)) {
 1535                 asoc->cookie_how[how_indx] = 1;
 1536         }
 1537         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 1538                 /* SHUTDOWN came in after sending INIT-ACK */
 1539                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 1540                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
 1541                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
 1542                     mflowtype, mflowid, inp->fibnum,
 1543                     vrf_id, net->port);
 1544                 if (how_indx < sizeof(asoc->cookie_how))
 1545                         asoc->cookie_how[how_indx] = 2;
 1546                 return (NULL);
 1547         }
 1548         /*
 1549          * find and validate the INIT chunk in the cookie (peer's info) the
 1550          * INIT should start after the cookie-echo header struct (chunk
 1551          * header, state cookie header struct)
 1552          */
 1553         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
 1554 
 1555         init_cp = (struct sctp_init_chunk *)
 1556             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
 1557             (uint8_t *)&init_buf);
 1558         if (init_cp == NULL) {
 1559                 /* could not pull a INIT chunk in cookie */
 1560                 return (NULL);
 1561         }
 1562         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
 1563                 return (NULL);
 1564         }
 1565         /*
 1566          * find and validate the INIT-ACK chunk in the cookie (my info) the
 1567          * INIT-ACK follows the INIT chunk
 1568          */
 1569         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
 1570         initack_cp = (struct sctp_init_ack_chunk *)
 1571             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
 1572             (uint8_t *)&initack_buf);
 1573         if (initack_cp == NULL) {
 1574                 /* could not pull INIT-ACK chunk in cookie */
 1575                 return (NULL);
 1576         }
 1577         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
 1578                 return (NULL);
 1579         }
 1580         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1581             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
 1582                 /*
 1583                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
 1584                  * to get into the OPEN state
 1585                  */
 1586                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
 1587                         /*-
 1588                          * Opps, this means that we somehow generated two vtag's
 1589                          * the same. I.e. we did:
 1590                          *  Us               Peer
 1591                          *   <---INIT(tag=a)------
 1592                          *   ----INIT-ACK(tag=t)-->
 1593                          *   ----INIT(tag=t)------> *1
 1594                          *   <---INIT-ACK(tag=a)---
 1595                          *   <----CE(tag=t)------------- *2
 1596                          *
 1597                          * At point *1 we should be generating a different
 1598                          * tag t'. Which means we would throw away the CE and send
 1599                          * ours instead. Basically this is case C (throw away side).
 1600                          */
 1601                         if (how_indx < sizeof(asoc->cookie_how))
 1602                                 asoc->cookie_how[how_indx] = 17;
 1603                         return (NULL);
 1604 
 1605                 }
 1606                 switch (SCTP_GET_STATE(asoc)) {
 1607                 case SCTP_STATE_COOKIE_WAIT:
 1608                 case SCTP_STATE_COOKIE_ECHOED:
 1609                         /*
 1610                          * INIT was sent but got a COOKIE_ECHO with the
 1611                          * correct tags... just accept it...but we must
 1612                          * process the init so that we can make sure we have
 1613                          * the right seq no's.
 1614                          */
 1615                         /* First we must process the INIT !! */
 1616                         retval = sctp_process_init(init_cp, stcb);
 1617                         if (retval < 0) {
 1618                                 if (how_indx < sizeof(asoc->cookie_how))
 1619                                         asoc->cookie_how[how_indx] = 3;
 1620                                 return (NULL);
 1621                         }
 1622                         /* we have already processed the INIT so no problem */
 1623                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
 1624                             stcb, net,
 1625                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
 1626                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
 1627                             stcb, net,
 1628                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
 1629                         /* update current state */
 1630                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
 1631                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 1632                         else
 1633                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1634 
 1635                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1636                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1637                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1638                                     stcb->sctp_ep, stcb, asoc->primary_destination);
 1639                         }
 1640                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1641                         sctp_stop_all_cookie_timers(stcb);
 1642                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1643                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 1644                             (inp->sctp_socket->so_qlimit == 0)
 1645                             ) {
 1646 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1647                                 struct socket *so;
 1648 #endif
 1649                                 /*
 1650                                  * Here is where collision would go if we
 1651                                  * did a connect() and instead got a
 1652                                  * init/init-ack/cookie done before the
 1653                                  * init-ack came back..
 1654                                  */
 1655                                 stcb->sctp_ep->sctp_flags |=
 1656                                     SCTP_PCB_FLAGS_CONNECTED;
 1657 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1658                                 so = SCTP_INP_SO(stcb->sctp_ep);
 1659                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1660                                 SCTP_TCB_UNLOCK(stcb);
 1661                                 SCTP_SOCKET_LOCK(so, 1);
 1662                                 SCTP_TCB_LOCK(stcb);
 1663                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1664                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1665                                         SCTP_SOCKET_UNLOCK(so, 1);
 1666                                         return (NULL);
 1667                                 }
 1668 #endif
 1669                                 soisconnected(stcb->sctp_socket);
 1670 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1671                                 SCTP_SOCKET_UNLOCK(so, 1);
 1672 #endif
 1673                         }
 1674                         /* notify upper layer */
 1675                         *notification = SCTP_NOTIFY_ASSOC_UP;
 1676                         /*
 1677                          * since we did not send a HB make sure we don't
 1678                          * double things
 1679                          */
 1680                         old.tv_sec = cookie->time_entered.tv_sec;
 1681                         old.tv_usec = cookie->time_entered.tv_usec;
 1682                         net->hb_responded = 1;
 1683                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
 1684                             &old,
 1685                             SCTP_RTT_FROM_NON_DATA);
 1686 
 1687                         if (stcb->asoc.sctp_autoclose_ticks &&
 1688                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
 1689                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
 1690                                     inp, stcb, NULL);
 1691                         }
 1692                         break;
 1693                 default:
 1694                         /*
 1695                          * we're in the OPEN state (or beyond), so peer must
 1696                          * have simply lost the COOKIE-ACK
 1697                          */
 1698                         break;
 1699                 }               /* end switch */
 1700                 sctp_stop_all_cookie_timers(stcb);
 1701                 /*
 1702                  * We ignore the return code here.. not sure if we should
 1703                  * somehow abort.. but we do have an existing asoc. This
 1704                  * really should not fail.
 1705                  */
 1706                 if (sctp_load_addresses_from_init(stcb, m,
 1707                     init_offset + sizeof(struct sctp_init_chunk),
 1708                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
 1709                         if (how_indx < sizeof(asoc->cookie_how))
 1710                                 asoc->cookie_how[how_indx] = 4;
 1711                         return (NULL);
 1712                 }
 1713                 /* respond with a COOKIE-ACK */
 1714                 sctp_toss_old_cookies(stcb, asoc);
 1715                 sctp_send_cookie_ack(stcb);
 1716                 if (how_indx < sizeof(asoc->cookie_how))
 1717                         asoc->cookie_how[how_indx] = 5;
 1718                 return (stcb);
 1719         }
 1720         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
 1721             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
 1722             cookie->tie_tag_my_vtag == 0 &&
 1723             cookie->tie_tag_peer_vtag == 0) {
 1724                 /*
 1725                  * case C in Section 5.2.4 Table 2: XMOO silently discard
 1726                  */
 1727                 if (how_indx < sizeof(asoc->cookie_how))
 1728                         asoc->cookie_how[how_indx] = 6;
 1729                 return (NULL);
 1730         }
 1731         /*
 1732          * If nat support, and the below and stcb is established, send back
 1733          * a ABORT(colliding state) if we are established.
 1734          */
 1735         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
 1736             (asoc->peer_supports_nat) &&
 1737             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1738             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
 1739             (asoc->peer_vtag == 0)))) {
 1740                 /*
 1741                  * Special case - Peer's support nat. We may have two init's
 1742                  * that we gave out the same tag on since one was not
 1743                  * established.. i.e. we get INIT from host-1 behind the nat
 1744                  * and we respond tag-a, we get a INIT from host-2 behind
 1745                  * the nat and we get tag-a again. Then we bring up host-1
 1746                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
 1747                  * Now we have colliding state. We must send an abort here
 1748                  * with colliding state indication.
 1749                  */
 1750                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
 1751                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 1752                     mflowtype, mflowid, inp->fibnum,
 1753                     vrf_id, port);
 1754                 return (NULL);
 1755         }
 1756         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
 1757             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
 1758             (asoc->peer_vtag == 0))) {
 1759                 /*
 1760                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
 1761                  * should be ok, re-accept peer info
 1762                  */
 1763                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
 1764                         /*
 1765                          * Extension of case C. If we hit this, then the
 1766                          * random number generator returned the same vtag
 1767                          * when we first sent our INIT-ACK and when we later
 1768                          * sent our INIT. The side with the seq numbers that
 1769                          * are different will be the one that normnally
 1770                          * would have hit case C. This in effect "extends"
 1771                          * our vtags in this collision case to be 64 bits.
 1772                          * The same collision could occur aka you get both
 1773                          * vtag and seq number the same twice in a row.. but
 1774                          * is much less likely. If it did happen then we
 1775                          * would proceed through and bring up the assoc.. we
 1776                          * may end up with the wrong stream setup however..
 1777                          * which would be bad.. but there is no way to
 1778                          * tell.. until we send on a stream that does not
 1779                          * exist :-)
 1780                          */
 1781                         if (how_indx < sizeof(asoc->cookie_how))
 1782                                 asoc->cookie_how[how_indx] = 7;
 1783 
 1784                         return (NULL);
 1785                 }
 1786                 if (how_indx < sizeof(asoc->cookie_how))
 1787                         asoc->cookie_how[how_indx] = 8;
 1788                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
 1789                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
 1790                 sctp_stop_all_cookie_timers(stcb);
 1791                 /*
 1792                  * since we did not send a HB make sure we don't double
 1793                  * things
 1794                  */
 1795                 net->hb_responded = 1;
 1796                 if (stcb->asoc.sctp_autoclose_ticks &&
 1797                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1798                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1799                             NULL);
 1800                 }
 1801                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 1802                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
 1803 
 1804                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
 1805                         /*
 1806                          * Ok the peer probably discarded our data (if we
 1807                          * echoed a cookie+data). So anything on the
 1808                          * sent_queue should be marked for retransmit, we
 1809                          * may not get something to kick us so it COULD
 1810                          * still take a timeout to move these.. but it can't
 1811                          * hurt to mark them.
 1812                          */
 1813                         struct sctp_tmit_chunk *chk;
 1814 
 1815                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 1816                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
 1817                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1818                                         sctp_flight_size_decrease(chk);
 1819                                         sctp_total_flight_decrease(stcb, chk);
 1820                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1821                                         spec_flag++;
 1822                                 }
 1823                         }
 1824 
 1825                 }
 1826                 /* process the INIT info (peer's info) */
 1827                 retval = sctp_process_init(init_cp, stcb);
 1828                 if (retval < 0) {
 1829                         if (how_indx < sizeof(asoc->cookie_how))
 1830                                 asoc->cookie_how[how_indx] = 9;
 1831                         return (NULL);
 1832                 }
 1833                 if (sctp_load_addresses_from_init(stcb, m,
 1834                     init_offset + sizeof(struct sctp_init_chunk),
 1835                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
 1836                         if (how_indx < sizeof(asoc->cookie_how))
 1837                                 asoc->cookie_how[how_indx] = 10;
 1838                         return (NULL);
 1839                 }
 1840                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
 1841                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
 1842                         *notification = SCTP_NOTIFY_ASSOC_UP;
 1843 
 1844                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 1845                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 1846                             (inp->sctp_socket->so_qlimit == 0)) {
 1847 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1848                                 struct socket *so;
 1849 #endif
 1850                                 stcb->sctp_ep->sctp_flags |=
 1851                                     SCTP_PCB_FLAGS_CONNECTED;
 1852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1853                                 so = SCTP_INP_SO(stcb->sctp_ep);
 1854                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1855                                 SCTP_TCB_UNLOCK(stcb);
 1856                                 SCTP_SOCKET_LOCK(so, 1);
 1857                                 SCTP_TCB_LOCK(stcb);
 1858                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1859                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1860                                         SCTP_SOCKET_UNLOCK(so, 1);
 1861                                         return (NULL);
 1862                                 }
 1863 #endif
 1864                                 soisconnected(stcb->sctp_socket);
 1865 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1866                                 SCTP_SOCKET_UNLOCK(so, 1);
 1867 #endif
 1868                         }
 1869                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
 1870                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 1871                         else
 1872                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1873                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1874                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 1875                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
 1876                 } else {
 1877                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
 1878                 }
 1879                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1880                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1881                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1882                             stcb->sctp_ep, stcb, asoc->primary_destination);
 1883                 }
 1884                 sctp_stop_all_cookie_timers(stcb);
 1885                 sctp_toss_old_cookies(stcb, asoc);
 1886                 sctp_send_cookie_ack(stcb);
 1887                 if (spec_flag) {
 1888                         /*
 1889                          * only if we have retrans set do we do this. What
 1890                          * this call does is get only the COOKIE-ACK out and
 1891                          * then when we return the normal call to
 1892                          * sctp_chunk_output will get the retrans out behind
 1893                          * this.
 1894                          */
 1895                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
 1896                 }
 1897                 if (how_indx < sizeof(asoc->cookie_how))
 1898                         asoc->cookie_how[how_indx] = 11;
 1899 
 1900                 return (stcb);
 1901         }
 1902         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
 1903             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
 1904             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
 1905             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
 1906             cookie->tie_tag_peer_vtag != 0) {
 1907                 struct sctpasochead *head;
 1908 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1909                 struct socket *so;
 1910 #endif
 1911 
 1912                 if (asoc->peer_supports_nat) {
 1913                         /*
 1914                          * This is a gross gross hack. Just call the
 1915                          * cookie_new code since we are allowing a duplicate
 1916                          * association. I hope this works...
 1917                          */
 1918                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
 1919                             sh, cookie, cookie_len,
 1920                             inp, netp, init_src, notification,
 1921                             auth_skipped, auth_offset, auth_len,
 1922                             mflowtype, mflowid,
 1923                             vrf_id, port));
 1924                 }
 1925                 /*
 1926                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
 1927                  */
 1928                 /* temp code */
 1929                 if (how_indx < sizeof(asoc->cookie_how))
 1930                         asoc->cookie_how[how_indx] = 12;
 1931                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
 1932                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
 1933                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
 1934                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
 1935 
 1936                 /* notify upper layer */
 1937                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
 1938                 atomic_add_int(&stcb->asoc.refcnt, 1);
 1939                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
 1940                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 1941                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 1942                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 1943                 }
 1944                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 1945                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
 1946                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1947                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
 1948                 }
 1949                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 1950                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1951                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1952                             stcb->sctp_ep, stcb, asoc->primary_destination);
 1953 
 1954                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
 1955                         /* move to OPEN state, if not in SHUTDOWN_SENT */
 1956                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 1957                 }
 1958                 asoc->pre_open_streams =
 1959                     ntohs(initack_cp->init.num_outbound_streams);
 1960                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
 1961                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
 1962                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
 1963 
 1964                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
 1965 
 1966                 asoc->str_reset_seq_in = asoc->init_seq_number;
 1967 
 1968                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 1969                 if (asoc->mapping_array) {
 1970                         memset(asoc->mapping_array, 0,
 1971                             asoc->mapping_array_size);
 1972                 }
 1973                 if (asoc->nr_mapping_array) {
 1974                         memset(asoc->nr_mapping_array, 0,
 1975                             asoc->mapping_array_size);
 1976                 }
 1977                 SCTP_TCB_UNLOCK(stcb);
 1978 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1979                 so = SCTP_INP_SO(stcb->sctp_ep);
 1980                 SCTP_SOCKET_LOCK(so, 1);
 1981 #endif
 1982                 SCTP_INP_INFO_WLOCK();
 1983                 SCTP_INP_WLOCK(stcb->sctp_ep);
 1984                 SCTP_TCB_LOCK(stcb);
 1985                 atomic_add_int(&stcb->asoc.refcnt, -1);
 1986                 /* send up all the data */
 1987                 SCTP_TCB_SEND_LOCK(stcb);
 1988 
 1989                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
 1990                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1991                         stcb->asoc.strmout[i].chunks_on_queues = 0;
 1992 #if defined(SCTP_DETAILED_STR_STATS)
 1993                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
 1994                                 asoc->strmout[i].abandoned_sent[j] = 0;
 1995                                 asoc->strmout[i].abandoned_unsent[j] = 0;
 1996                         }
 1997 #else
 1998                         asoc->strmout[i].abandoned_sent[0] = 0;
 1999                         asoc->strmout[i].abandoned_unsent[0] = 0;
 2000 #endif
 2001                         stcb->asoc.strmout[i].sid = i;
 2002                         stcb->asoc.strmout[i].next_mid_ordered = 0;
 2003                         stcb->asoc.strmout[i].next_mid_unordered = 0;
 2004                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
 2005                 }
 2006                 /* process the INIT-ACK info (my info) */
 2007                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
 2008                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 2009 
 2010                 /* pull from vtag hash */
 2011                 LIST_REMOVE(stcb, sctp_asocs);
 2012                 /* re-insert to new vtag position */
 2013                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
 2014                     SCTP_BASE_INFO(hashasocmark))];
 2015                 /*
 2016                  * put it in the bucket in the vtag hash of assoc's for the
 2017                  * system
 2018                  */
 2019                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 2020 
 2021                 SCTP_TCB_SEND_UNLOCK(stcb);
 2022                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
 2023                 SCTP_INP_INFO_WUNLOCK();
 2024 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2025                 SCTP_SOCKET_UNLOCK(so, 1);
 2026 #endif
 2027                 asoc->total_flight = 0;
 2028                 asoc->total_flight_count = 0;
 2029                 /* process the INIT info (peer's info) */
 2030                 retval = sctp_process_init(init_cp, stcb);
 2031                 if (retval < 0) {
 2032                         if (how_indx < sizeof(asoc->cookie_how))
 2033                                 asoc->cookie_how[how_indx] = 13;
 2034 
 2035                         return (NULL);
 2036                 }
 2037                 /*
 2038                  * since we did not send a HB make sure we don't double
 2039                  * things
 2040                  */
 2041                 net->hb_responded = 1;
 2042 
 2043                 if (sctp_load_addresses_from_init(stcb, m,
 2044                     init_offset + sizeof(struct sctp_init_chunk),
 2045                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
 2046                         if (how_indx < sizeof(asoc->cookie_how))
 2047                                 asoc->cookie_how[how_indx] = 14;
 2048 
 2049                         return (NULL);
 2050                 }
 2051                 /* respond with a COOKIE-ACK */
 2052                 sctp_stop_all_cookie_timers(stcb);
 2053                 sctp_toss_old_cookies(stcb, asoc);
 2054                 sctp_send_cookie_ack(stcb);
 2055                 if (how_indx < sizeof(asoc->cookie_how))
 2056                         asoc->cookie_how[how_indx] = 15;
 2057 
 2058                 return (stcb);
 2059         }
 2060         if (how_indx < sizeof(asoc->cookie_how))
 2061                 asoc->cookie_how[how_indx] = 16;
 2062         /* all other cases... */
 2063         return (NULL);
 2064 }
 2065 
 2066 
 2067 /*
 2068  * handle a state cookie for a new association m: input packet mbuf chain--
 2069  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
 2070  * and the cookie signature does not exist offset: offset into mbuf to the
 2071  * cookie-echo chunk length: length of the cookie chunk to: where the init
 2072  * was from returns a new TCB
 2073  */
 2074 static struct sctp_tcb *
 2075 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
 2076     struct sockaddr *src, struct sockaddr *dst,
 2077     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
 2078     struct sctp_inpcb *inp, struct sctp_nets **netp,
 2079     struct sockaddr *init_src, int *notification,
 2080     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 2081     uint8_t mflowtype, uint32_t mflowid,
 2082     uint32_t vrf_id, uint16_t port)
 2083 {
 2084         struct sctp_tcb *stcb;
 2085         struct sctp_init_chunk *init_cp, init_buf;
 2086         struct sctp_init_ack_chunk *initack_cp, initack_buf;
 2087         union sctp_sockstore store;
 2088         struct sctp_association *asoc;
 2089         int init_offset, initack_offset, initack_limit;
 2090         int retval;
 2091         int error = 0;
 2092         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
 2093 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2094         struct socket *so;
 2095 
 2096         so = SCTP_INP_SO(inp);
 2097 #endif
 2098 
 2099         /*
 2100          * find and validate the INIT chunk in the cookie (peer's info) the
 2101          * INIT should start after the cookie-echo header struct (chunk
 2102          * header, state cookie header struct)
 2103          */
 2104         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
 2105         init_cp = (struct sctp_init_chunk *)
 2106             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
 2107             (uint8_t *)&init_buf);
 2108         if (init_cp == NULL) {
 2109                 /* could not pull a INIT chunk in cookie */
 2110                 SCTPDBG(SCTP_DEBUG_INPUT1,
 2111                     "process_cookie_new: could not pull INIT chunk hdr\n");
 2112                 return (NULL);
 2113         }
 2114         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
 2115                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
 2116                 return (NULL);
 2117         }
 2118         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
 2119         /*
 2120          * find and validate the INIT-ACK chunk in the cookie (my info) the
 2121          * INIT-ACK follows the INIT chunk
 2122          */
 2123         initack_cp = (struct sctp_init_ack_chunk *)
 2124             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
 2125             (uint8_t *)&initack_buf);
 2126         if (initack_cp == NULL) {
 2127                 /* could not pull INIT-ACK chunk in cookie */
 2128                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
 2129                 return (NULL);
 2130         }
 2131         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
 2132                 return (NULL);
 2133         }
 2134         /*
 2135          * NOTE: We can't use the INIT_ACK's chk_length to determine the
 2136          * "initack_limit" value.  This is because the chk_length field
 2137          * includes the length of the cookie, but the cookie is omitted when
 2138          * the INIT and INIT_ACK are tacked onto the cookie...
 2139          */
 2140         initack_limit = offset + cookie_len;
 2141 
 2142         /*
 2143          * now that we know the INIT/INIT-ACK are in place, create a new TCB
 2144          * and popluate
 2145          */
 2146 
 2147         /*
 2148          * Here we do a trick, we set in NULL for the proc/thread argument.
 2149          * We do this since in effect we only use the p argument when the
 2150          * socket is unbound and we must do an implicit bind. Since we are
 2151          * getting a cookie, we cannot be unbound.
 2152          */
 2153         stcb = sctp_aloc_assoc(inp, init_src, &error,
 2154             ntohl(initack_cp->init.initiate_tag), vrf_id,
 2155             ntohs(initack_cp->init.num_outbound_streams),
 2156             port,
 2157             (struct thread *)NULL
 2158             );
 2159         if (stcb == NULL) {
 2160                 struct mbuf *op_err;
 2161 
 2162                 /* memory problem? */
 2163                 SCTPDBG(SCTP_DEBUG_INPUT1,
 2164                     "process_cookie_new: no room for another TCB!\n");
 2165                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 2166                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
 2167                     src, dst, sh, op_err,
 2168                     mflowtype, mflowid,
 2169                     vrf_id, port);
 2170                 return (NULL);
 2171         }
 2172         /* get the correct sctp_nets */
 2173         if (netp)
 2174                 *netp = sctp_findnet(stcb, init_src);
 2175 
 2176         asoc = &stcb->asoc;
 2177         /* get scope variables out of cookie */
 2178         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
 2179         asoc->scope.site_scope = cookie->site_scope;
 2180         asoc->scope.local_scope = cookie->local_scope;
 2181         asoc->scope.loopback_scope = cookie->loopback_scope;
 2182 
 2183         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
 2184             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
 2185                 struct mbuf *op_err;
 2186 
 2187                 /*
 2188                  * Houston we have a problem. The EP changed while the
 2189                  * cookie was in flight. Only recourse is to abort the
 2190                  * association.
 2191                  */
 2192                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 2193                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
 2194                     src, dst, sh, op_err,
 2195                     mflowtype, mflowid,
 2196                     vrf_id, port);
 2197 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2198                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2199                 SCTP_TCB_UNLOCK(stcb);
 2200                 SCTP_SOCKET_LOCK(so, 1);
 2201                 SCTP_TCB_LOCK(stcb);
 2202                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2203 #endif
 2204                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2205                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
 2206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2207                 SCTP_SOCKET_UNLOCK(so, 1);
 2208 #endif
 2209                 return (NULL);
 2210         }
 2211         /* process the INIT-ACK info (my info) */
 2212         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
 2213         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
 2214         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
 2215         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
 2216         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
 2217         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
 2218         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
 2219         asoc->str_reset_seq_in = asoc->init_seq_number;
 2220 
 2221         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 2222 
 2223         /* process the INIT info (peer's info) */
 2224         if (netp)
 2225                 retval = sctp_process_init(init_cp, stcb);
 2226         else
 2227                 retval = 0;
 2228         if (retval < 0) {
 2229 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2230                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2231                 SCTP_TCB_UNLOCK(stcb);
 2232                 SCTP_SOCKET_LOCK(so, 1);
 2233                 SCTP_TCB_LOCK(stcb);
 2234                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2235 #endif
 2236                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2237                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
 2238 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2239                 SCTP_SOCKET_UNLOCK(so, 1);
 2240 #endif
 2241                 return (NULL);
 2242         }
 2243         /* load all addresses */
 2244         if (sctp_load_addresses_from_init(stcb, m,
 2245             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
 2246             src, dst, init_src, port)) {
 2247 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2248                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2249                 SCTP_TCB_UNLOCK(stcb);
 2250                 SCTP_SOCKET_LOCK(so, 1);
 2251                 SCTP_TCB_LOCK(stcb);
 2252                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2253 #endif
 2254                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2255                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
 2256 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2257                 SCTP_SOCKET_UNLOCK(so, 1);
 2258 #endif
 2259                 return (NULL);
 2260         }
 2261         /*
 2262          * verify any preceding AUTH chunk that was skipped
 2263          */
 2264         /* pull the local authentication parameters from the cookie/init-ack */
 2265         sctp_auth_get_cookie_params(stcb, m,
 2266             initack_offset + sizeof(struct sctp_init_ack_chunk),
 2267             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
 2268         if (auth_skipped) {
 2269                 struct sctp_auth_chunk *auth;
 2270 
 2271                 auth = (struct sctp_auth_chunk *)
 2272                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
 2273                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
 2274                         /* auth HMAC failed, dump the assoc and packet */
 2275                         SCTPDBG(SCTP_DEBUG_AUTH1,
 2276                             "COOKIE-ECHO: AUTH failed\n");
 2277 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2278                         atomic_add_int(&stcb->asoc.refcnt, 1);
 2279                         SCTP_TCB_UNLOCK(stcb);
 2280                         SCTP_SOCKET_LOCK(so, 1);
 2281                         SCTP_TCB_LOCK(stcb);
 2282                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2283 #endif
 2284                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2285                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
 2286 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2287                         SCTP_SOCKET_UNLOCK(so, 1);
 2288 #endif
 2289                         return (NULL);
 2290                 } else {
 2291                         /* remaining chunks checked... good to go */
 2292                         stcb->asoc.authenticated = 1;
 2293                 }
 2294         }
 2295         /*
 2296          * if we're doing ASCONFs, check to see if we have any new local
 2297          * addresses that need to get added to the peer (eg. addresses
 2298          * changed while cookie echo in flight).  This needs to be done
 2299          * after we go to the OPEN state to do the correct asconf
 2300          * processing. else, make sure we have the correct addresses in our
 2301          * lists
 2302          */
 2303 
 2304         /* warning, we re-use sin, sin6, sa_store here! */
 2305         /* pull in local_address (our "from" address) */
 2306         switch (cookie->laddr_type) {
 2307 #ifdef INET
 2308         case SCTP_IPV4_ADDRESS:
 2309                 /* source addr is IPv4 */
 2310                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
 2311                 store.sin.sin_family = AF_INET;
 2312                 store.sin.sin_len = sizeof(struct sockaddr_in);
 2313                 store.sin.sin_addr.s_addr = cookie->laddress[0];
 2314                 break;
 2315 #endif
 2316 #ifdef INET6
 2317         case SCTP_IPV6_ADDRESS:
 2318                 /* source addr is IPv6 */
 2319                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
 2320                 store.sin6.sin6_family = AF_INET6;
 2321                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
 2322                 store.sin6.sin6_scope_id = cookie->scope_id;
 2323                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
 2324                 break;
 2325 #endif
 2326         default:
 2327 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2328                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2329                 SCTP_TCB_UNLOCK(stcb);
 2330                 SCTP_SOCKET_LOCK(so, 1);
 2331                 SCTP_TCB_LOCK(stcb);
 2332                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2333 #endif
 2334                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 2335                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
 2336 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2337                 SCTP_SOCKET_UNLOCK(so, 1);
 2338 #endif
 2339                 return (NULL);
 2340         }
 2341 
 2342         /* update current state */
 2343         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
 2344         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 2345         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 2346                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 2347                     stcb->sctp_ep, stcb, asoc->primary_destination);
 2348         }
 2349         sctp_stop_all_cookie_timers(stcb);
 2350         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
 2351         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 2352 
 2353         /* set up to notify upper layer */
 2354         *notification = SCTP_NOTIFY_ASSOC_UP;
 2355         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 2356             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
 2357             (inp->sctp_socket->so_qlimit == 0)) {
 2358                 /*
 2359                  * This is an endpoint that called connect() how it got a
 2360                  * cookie that is NEW is a bit of a mystery. It must be that
 2361                  * the INIT was sent, but before it got there.. a complete
 2362                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
 2363                  * should have went to the other code.. not here.. oh well..
 2364                  * a bit of protection is worth having..
 2365                  */
 2366                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 2367 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2368                 atomic_add_int(&stcb->asoc.refcnt, 1);
 2369                 SCTP_TCB_UNLOCK(stcb);
 2370                 SCTP_SOCKET_LOCK(so, 1);
 2371                 SCTP_TCB_LOCK(stcb);
 2372                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2373                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 2374                         SCTP_SOCKET_UNLOCK(so, 1);
 2375                         return (NULL);
 2376                 }
 2377 #endif
 2378                 soisconnected(stcb->sctp_socket);
 2379 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2380                 SCTP_SOCKET_UNLOCK(so, 1);
 2381 #endif
 2382         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 2383             (inp->sctp_socket->so_qlimit)) {
 2384                 /*
 2385                  * We don't want to do anything with this one. Since it is
 2386                  * the listening guy. The timer will get started for
 2387                  * accepted connections in the caller.
 2388                  */
 2389                 ;
 2390         }
 2391         /* since we did not send a HB make sure we don't double things */
 2392         if ((netp) && (*netp))
 2393                 (*netp)->hb_responded = 1;
 2394 
 2395         if (stcb->asoc.sctp_autoclose_ticks &&
 2396             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 2397                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
 2398         }
 2399         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 2400         if ((netp != NULL) && (*netp != NULL)) {
 2401                 struct timeval old;
 2402 
 2403                 /* calculate the RTT and set the encaps port */
 2404                 old.tv_sec = cookie->time_entered.tv_sec;
 2405                 old.tv_usec = cookie->time_entered.tv_usec;
 2406                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
 2407                     &old, SCTP_RTT_FROM_NON_DATA);
 2408         }
 2409         /* respond with a COOKIE-ACK */
 2410         sctp_send_cookie_ack(stcb);
 2411 
 2412         /*
 2413          * check the address lists for any ASCONFs that need to be sent
 2414          * AFTER the cookie-ack is sent
 2415          */
 2416         sctp_check_address_list(stcb, m,
 2417             initack_offset + sizeof(struct sctp_init_ack_chunk),
 2418             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
 2419             &store.sa, cookie->local_scope, cookie->site_scope,
 2420             cookie->ipv4_scope, cookie->loopback_scope);
 2421 
 2422 
 2423         return (stcb);
 2424 }
 2425 
 2426 /*
 2427  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
 2428  * we NEED to make sure we are not already using the vtag. If so we
 2429  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
 2430         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
 2431                                                             SCTP_BASE_INFO(hashasocmark))];
 2432         LIST_FOREACH(stcb, head, sctp_asocs) {
 2433                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
 2434                        -- SEND ABORT - TRY AGAIN --
 2435                 }
 2436         }
 2437 */
 2438 
 2439 /*
 2440  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
 2441  * existing (non-NULL) TCB
 2442  */
 2443 static struct mbuf *
 2444 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
 2445     struct sockaddr *src, struct sockaddr *dst,
 2446     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
 2447     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
 2448     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
 2449     struct sctp_tcb **locked_tcb,
 2450     uint8_t mflowtype, uint32_t mflowid,
 2451     uint32_t vrf_id, uint16_t port)
 2452 {
 2453         struct sctp_state_cookie *cookie;
 2454         struct sctp_tcb *l_stcb = *stcb;
 2455         struct sctp_inpcb *l_inp;
 2456         struct sockaddr *to;
 2457         struct sctp_pcb *ep;
 2458         struct mbuf *m_sig;
 2459         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
 2460         uint8_t *sig;
 2461         uint8_t cookie_ok = 0;
 2462         unsigned int sig_offset, cookie_offset;
 2463         unsigned int cookie_len;
 2464         struct timeval now;
 2465         struct timeval time_expires;
 2466         int notification = 0;
 2467         struct sctp_nets *netl;
 2468         int had_a_existing_tcb = 0;
 2469         int send_int_conf = 0;
 2470 #ifdef INET
 2471         struct sockaddr_in sin;
 2472 #endif
 2473 #ifdef INET6
 2474         struct sockaddr_in6 sin6;
 2475 #endif
 2476 
 2477         SCTPDBG(SCTP_DEBUG_INPUT2,
 2478             "sctp_handle_cookie: handling COOKIE-ECHO\n");
 2479 
 2480         if (inp_p == NULL) {
 2481                 return (NULL);
 2482         }
 2483         cookie = &cp->cookie;
 2484         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
 2485         cookie_len = ntohs(cp->ch.chunk_length);
 2486 
 2487         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
 2488             sizeof(struct sctp_init_chunk) +
 2489             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
 2490                 /* cookie too small */
 2491                 return (NULL);
 2492         }
 2493         if ((cookie->peerport != sh->src_port) ||
 2494             (cookie->myport != sh->dest_port) ||
 2495             (cookie->my_vtag != sh->v_tag)) {
 2496                 /*
 2497                  * invalid ports or bad tag.  Note that we always leave the
 2498                  * v_tag in the header in network order and when we stored
 2499                  * it in the my_vtag slot we also left it in network order.
 2500                  * This maintains the match even though it may be in the
 2501                  * opposite byte order of the machine :->
 2502                  */
 2503                 return (NULL);
 2504         }
 2505         /*
 2506          * split off the signature into its own mbuf (since it should not be
 2507          * calculated in the sctp_hmac_m() call).
 2508          */
 2509         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
 2510         m_sig = m_split(m, sig_offset, M_NOWAIT);
 2511         if (m_sig == NULL) {
 2512                 /* out of memory or ?? */
 2513                 return (NULL);
 2514         }
 2515 #ifdef SCTP_MBUF_LOGGING
 2516         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 2517                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
 2518         }
 2519 #endif
 2520 
 2521         /*
 2522          * compute the signature/digest for the cookie
 2523          */
 2524         ep = &(*inp_p)->sctp_ep;
 2525         l_inp = *inp_p;
 2526         if (l_stcb) {
 2527                 SCTP_TCB_UNLOCK(l_stcb);
 2528         }
 2529         SCTP_INP_RLOCK(l_inp);
 2530         if (l_stcb) {
 2531                 SCTP_TCB_LOCK(l_stcb);
 2532         }
 2533         /* which cookie is it? */
 2534         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
 2535             (ep->current_secret_number != ep->last_secret_number)) {
 2536                 /* it's the old cookie */
 2537                 (void)sctp_hmac_m(SCTP_HMAC,
 2538                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
 2539                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2540         } else {
 2541                 /* it's the current cookie */
 2542                 (void)sctp_hmac_m(SCTP_HMAC,
 2543                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
 2544                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2545         }
 2546         /* get the signature */
 2547         SCTP_INP_RUNLOCK(l_inp);
 2548         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
 2549         if (sig == NULL) {
 2550                 /* couldn't find signature */
 2551                 sctp_m_freem(m_sig);
 2552                 return (NULL);
 2553         }
 2554         /* compare the received digest with the computed digest */
 2555         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
 2556                 /* try the old cookie? */
 2557                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
 2558                     (ep->current_secret_number != ep->last_secret_number)) {
 2559                         /* compute digest with old */
 2560                         (void)sctp_hmac_m(SCTP_HMAC,
 2561                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
 2562                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
 2563                         /* compare */
 2564                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
 2565                                 cookie_ok = 1;
 2566                 }
 2567         } else {
 2568                 cookie_ok = 1;
 2569         }
 2570 
 2571         /*
 2572          * Now before we continue we must reconstruct our mbuf so that
 2573          * normal processing of any other chunks will work.
 2574          */
 2575         {
 2576                 struct mbuf *m_at;
 2577 
 2578                 m_at = m;
 2579                 while (SCTP_BUF_NEXT(m_at) != NULL) {
 2580                         m_at = SCTP_BUF_NEXT(m_at);
 2581                 }
 2582                 SCTP_BUF_NEXT(m_at) = m_sig;
 2583         }
 2584 
 2585         if (cookie_ok == 0) {
 2586                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
 2587                 SCTPDBG(SCTP_DEBUG_INPUT2,
 2588                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
 2589                     (uint32_t)offset, cookie_offset, sig_offset);
 2590                 return (NULL);
 2591         }
 2592         /*
 2593          * check the cookie timestamps to be sure it's not stale
 2594          */
 2595         (void)SCTP_GETTIME_TIMEVAL(&now);
 2596         /* Expire time is in Ticks, so we convert to seconds */
 2597         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
 2598         time_expires.tv_usec = cookie->time_entered.tv_usec;
 2599         if (timevalcmp(&now, &time_expires, >)) {
 2600                 /* cookie is stale! */
 2601                 struct mbuf *op_err;
 2602                 struct sctp_error_stale_cookie *cause;
 2603                 struct timeval diff;
 2604                 uint32_t staleness;
 2605 
 2606                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
 2607                     0, M_NOWAIT, 1, MT_DATA);
 2608                 if (op_err == NULL) {
 2609                         /* FOOBAR */
 2610                         return (NULL);
 2611                 }
 2612                 /* Set the len */
 2613                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
 2614                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
 2615                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
 2616                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
 2617                     (sizeof(uint32_t))));
 2618                 diff = now;
 2619                 timevalsub(&diff, &time_expires);
 2620                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
 2621                         staleness = UINT32_MAX;
 2622                 } else {
 2623                         staleness = diff.tv_sec * 1000000;
 2624                 }
 2625                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
 2626                         staleness += diff.tv_usec;
 2627                 } else {
 2628                         staleness = UINT32_MAX;
 2629                 }
 2630                 cause->stale_time = htonl(staleness);
 2631                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
 2632                     mflowtype, mflowid, l_inp->fibnum,
 2633                     vrf_id, port);
 2634                 return (NULL);
 2635         }
 2636         /*
 2637          * Now we must see with the lookup address if we have an existing
 2638          * asoc. This will only happen if we were in the COOKIE-WAIT state
 2639          * and a INIT collided with us and somewhere the peer sent the
 2640          * cookie on another address besides the single address our assoc
 2641          * had for him. In this case we will have one of the tie-tags set at
 2642          * least AND the address field in the cookie can be used to look it
 2643          * up.
 2644          */
 2645         to = NULL;
 2646         switch (cookie->addr_type) {
 2647 #ifdef INET6
 2648         case SCTP_IPV6_ADDRESS:
 2649                 memset(&sin6, 0, sizeof(sin6));
 2650                 sin6.sin6_family = AF_INET6;
 2651                 sin6.sin6_len = sizeof(sin6);
 2652                 sin6.sin6_port = sh->src_port;
 2653                 sin6.sin6_scope_id = cookie->scope_id;
 2654                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
 2655                     sizeof(sin6.sin6_addr.s6_addr));
 2656                 to = (struct sockaddr *)&sin6;
 2657                 break;
 2658 #endif
 2659 #ifdef INET
 2660         case SCTP_IPV4_ADDRESS:
 2661                 memset(&sin, 0, sizeof(sin));
 2662                 sin.sin_family = AF_INET;
 2663                 sin.sin_len = sizeof(sin);
 2664                 sin.sin_port = sh->src_port;
 2665                 sin.sin_addr.s_addr = cookie->address[0];
 2666                 to = (struct sockaddr *)&sin;
 2667                 break;
 2668 #endif
 2669         default:
 2670                 /* This should not happen */
 2671                 return (NULL);
 2672         }
 2673         if (*stcb == NULL) {
 2674                 /* Yep, lets check */
 2675                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
 2676                 if (*stcb == NULL) {
 2677                         /*
 2678                          * We should have only got back the same inp. If we
 2679                          * got back a different ep we have a problem. The
 2680                          * original findep got back l_inp and now
 2681                          */
 2682                         if (l_inp != *inp_p) {
 2683                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
 2684                         }
 2685                 } else {
 2686                         if (*locked_tcb == NULL) {
 2687                                 /*
 2688                                  * In this case we found the assoc only
 2689                                  * after we locked the create lock. This
 2690                                  * means we are in a colliding case and we
 2691                                  * must make sure that we unlock the tcb if
 2692                                  * its one of the cases where we throw away
 2693                                  * the incoming packets.
 2694                                  */
 2695                                 *locked_tcb = *stcb;
 2696 
 2697                                 /*
 2698                                  * We must also increment the inp ref count
 2699                                  * since the ref_count flags was set when we
 2700                                  * did not find the TCB, now we found it
 2701                                  * which reduces the refcount.. we must
 2702                                  * raise it back out to balance it all :-)
 2703                                  */
 2704                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
 2705                                 if ((*stcb)->sctp_ep != l_inp) {
 2706                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
 2707                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
 2708                                 }
 2709                         }
 2710                 }
 2711         }
 2712         cookie_len -= SCTP_SIGNATURE_SIZE;
 2713         if (*stcb == NULL) {
 2714                 /* this is the "normal" case... get a new TCB */
 2715                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
 2716                     cookie, cookie_len, *inp_p,
 2717                     netp, to, &notification,
 2718                     auth_skipped, auth_offset, auth_len,
 2719                     mflowtype, mflowid,
 2720                     vrf_id, port);
 2721         } else {
 2722                 /* this is abnormal... cookie-echo on existing TCB */
 2723                 had_a_existing_tcb = 1;
 2724                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
 2725                     src, dst, sh,
 2726                     cookie, cookie_len, *inp_p, *stcb, netp, to,
 2727                     &notification, auth_skipped, auth_offset, auth_len,
 2728                     mflowtype, mflowid,
 2729                     vrf_id, port);
 2730         }
 2731 
 2732         if (*stcb == NULL) {
 2733                 /* still no TCB... must be bad cookie-echo */
 2734                 return (NULL);
 2735         }
 2736         if (*netp != NULL) {
 2737                 (*netp)->flowtype = mflowtype;
 2738                 (*netp)->flowid = mflowid;
 2739         }
 2740         /*
 2741          * Ok, we built an association so confirm the address we sent the
 2742          * INIT-ACK to.
 2743          */
 2744         netl = sctp_findnet(*stcb, to);
 2745         /*
 2746          * This code should in theory NOT run but
 2747          */
 2748         if (netl == NULL) {
 2749                 /* TSNH! Huh, why do I need to add this address here? */
 2750                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
 2751                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
 2752                         return (NULL);
 2753                 }
 2754                 netl = sctp_findnet(*stcb, to);
 2755         }
 2756         if (netl) {
 2757                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
 2758                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 2759                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
 2760                             netl);
 2761                         send_int_conf = 1;
 2762                 }
 2763         }
 2764         sctp_start_net_timers(*stcb);
 2765         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 2766                 if (!had_a_existing_tcb ||
 2767                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 2768                         /*
 2769                          * If we have a NEW cookie or the connect never
 2770                          * reached the connected state during collision we
 2771                          * must do the TCP accept thing.
 2772                          */
 2773                         struct socket *so, *oso;
 2774                         struct sctp_inpcb *inp;
 2775 
 2776                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
 2777                                 /*
 2778                                  * For a restart we will keep the same
 2779                                  * socket, no need to do anything. I THINK!!
 2780                                  */
 2781                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2782                                 if (send_int_conf) {
 2783                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2784                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2785                                 }
 2786                                 return (m);
 2787                         }
 2788                         oso = (*inp_p)->sctp_socket;
 2789                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2790                         SCTP_TCB_UNLOCK((*stcb));
 2791                         CURVNET_SET(oso->so_vnet);
 2792                         so = sonewconn(oso, 0
 2793                             );
 2794                         CURVNET_RESTORE();
 2795                         SCTP_TCB_LOCK((*stcb));
 2796                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2797 
 2798                         if (so == NULL) {
 2799                                 struct mbuf *op_err;
 2800 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2801                                 struct socket *pcb_so;
 2802 #endif
 2803                                 /* Too many sockets */
 2804                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
 2805                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 2806                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
 2807                                     src, dst, sh, op_err,
 2808                                     mflowtype, mflowid,
 2809                                     vrf_id, port);
 2810 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2811                                 pcb_so = SCTP_INP_SO(*inp_p);
 2812                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2813                                 SCTP_TCB_UNLOCK((*stcb));
 2814                                 SCTP_SOCKET_LOCK(pcb_so, 1);
 2815                                 SCTP_TCB_LOCK((*stcb));
 2816                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2817 #endif
 2818                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
 2819                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
 2820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2821                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
 2822 #endif
 2823                                 return (NULL);
 2824                         }
 2825                         inp = (struct sctp_inpcb *)so->so_pcb;
 2826                         SCTP_INP_INCR_REF(inp);
 2827                         /*
 2828                          * We add the unbound flag here so that if we get an
 2829                          * soabort() before we get the move_pcb done, we
 2830                          * will properly cleanup.
 2831                          */
 2832                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
 2833                             SCTP_PCB_FLAGS_CONNECTED |
 2834                             SCTP_PCB_FLAGS_IN_TCPPOOL |
 2835                             SCTP_PCB_FLAGS_UNBOUND |
 2836                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
 2837                             SCTP_PCB_FLAGS_DONT_WAKE);
 2838                         inp->sctp_features = (*inp_p)->sctp_features;
 2839                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
 2840                         inp->sctp_socket = so;
 2841                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
 2842                         inp->max_cwnd = (*inp_p)->max_cwnd;
 2843                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
 2844                         inp->ecn_supported = (*inp_p)->ecn_supported;
 2845                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
 2846                         inp->auth_supported = (*inp_p)->auth_supported;
 2847                         inp->asconf_supported = (*inp_p)->asconf_supported;
 2848                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
 2849                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
 2850                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
 2851                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
 2852                         inp->sctp_context = (*inp_p)->sctp_context;
 2853                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
 2854                         inp->fibnum = (*inp_p)->fibnum;
 2855                         inp->inp_starting_point_for_iterator = NULL;
 2856                         /*
 2857                          * copy in the authentication parameters from the
 2858                          * original endpoint
 2859                          */
 2860                         if (inp->sctp_ep.local_hmacs)
 2861                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
 2862                         inp->sctp_ep.local_hmacs =
 2863                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
 2864                         if (inp->sctp_ep.local_auth_chunks)
 2865                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
 2866                         inp->sctp_ep.local_auth_chunks =
 2867                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
 2868 
 2869                         /*
 2870                          * Now we must move it from one hash table to
 2871                          * another and get the tcb in the right place.
 2872                          */
 2873 
 2874                         /*
 2875                          * This is where the one-2-one socket is put into
 2876                          * the accept state waiting for the accept!
 2877                          */
 2878                         if (*stcb) {
 2879                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
 2880                         }
 2881                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
 2882 
 2883                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2884                         SCTP_TCB_UNLOCK((*stcb));
 2885 
 2886                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
 2887                             0);
 2888                         SCTP_TCB_LOCK((*stcb));
 2889                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2890 
 2891 
 2892                         /*
 2893                          * now we must check to see if we were aborted while
 2894                          * the move was going on and the lock/unlock
 2895                          * happened.
 2896                          */
 2897                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 2898                                 /*
 2899                                  * yep it was, we leave the assoc attached
 2900                                  * to the socket since the sctp_inpcb_free()
 2901                                  * call will send an abort for us.
 2902                                  */
 2903                                 SCTP_INP_DECR_REF(inp);
 2904                                 return (NULL);
 2905                         }
 2906                         SCTP_INP_DECR_REF(inp);
 2907                         /* Switch over to the new guy */
 2908                         *inp_p = inp;
 2909                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2910                         if (send_int_conf) {
 2911                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2912                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2913                         }
 2914                         /*
 2915                          * Pull it from the incomplete queue and wake the
 2916                          * guy
 2917                          */
 2918 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2919                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
 2920                         SCTP_TCB_UNLOCK((*stcb));
 2921                         SCTP_SOCKET_LOCK(so, 1);
 2922 #endif
 2923                         soisconnected(so);
 2924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2925                         SCTP_TCB_LOCK((*stcb));
 2926                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
 2927                         SCTP_SOCKET_UNLOCK(so, 1);
 2928 #endif
 2929                         return (m);
 2930                 }
 2931         }
 2932         if (notification) {
 2933                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2934         }
 2935         if (send_int_conf) {
 2936                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 2937                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
 2938         }
 2939         return (m);
 2940 }
 2941 
 2942 static void
 2943 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
 2944     struct sctp_tcb *stcb, struct sctp_nets *net)
 2945 {
 2946         /* cp must not be used, others call this without a c-ack :-) */
 2947         struct sctp_association *asoc;
 2948 
 2949         SCTPDBG(SCTP_DEBUG_INPUT2,
 2950             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
 2951         if ((stcb == NULL) || (net == NULL)) {
 2952                 return;
 2953         }
 2954         asoc = &stcb->asoc;
 2955         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 2956                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 2957                     asoc->overall_error_count,
 2958                     0,
 2959                     SCTP_FROM_SCTP_INPUT,
 2960                     __LINE__);
 2961         }
 2962         asoc->overall_error_count = 0;
 2963         sctp_stop_all_cookie_timers(stcb);
 2964         /* process according to association state */
 2965         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
 2966                 /* state change only needed when I am in right state */
 2967                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
 2968                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
 2969                 sctp_start_net_timers(stcb);
 2970                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
 2971                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 2972                             stcb->sctp_ep, stcb, asoc->primary_destination);
 2973 
 2974                 }
 2975                 /* update RTO */
 2976                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
 2977                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
 2978                 if (asoc->overall_error_count == 0) {
 2979                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
 2980                             &asoc->time_entered,
 2981                             SCTP_RTT_FROM_NON_DATA);
 2982                 }
 2983                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 2984                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 2985                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 2986                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 2987 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2988                         struct socket *so;
 2989 
 2990 #endif
 2991                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 2992 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 2993                         so = SCTP_INP_SO(stcb->sctp_ep);
 2994                         atomic_add_int(&stcb->asoc.refcnt, 1);
 2995                         SCTP_TCB_UNLOCK(stcb);
 2996                         SCTP_SOCKET_LOCK(so, 1);
 2997                         SCTP_TCB_LOCK(stcb);
 2998                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 2999 #endif
 3000                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
 3001                                 soisconnected(stcb->sctp_socket);
 3002                         }
 3003 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3004                         SCTP_SOCKET_UNLOCK(so, 1);
 3005 #endif
 3006                 }
 3007                 /*
 3008                  * since we did not send a HB make sure we don't double
 3009                  * things
 3010                  */
 3011                 net->hb_responded = 1;
 3012 
 3013                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 3014                         /*
 3015                          * We don't need to do the asconf thing, nor hb or
 3016                          * autoclose if the socket is closed.
 3017                          */
 3018                         goto closed_socket;
 3019                 }
 3020                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 3021                     stcb, net);
 3022 
 3023 
 3024                 if (stcb->asoc.sctp_autoclose_ticks &&
 3025                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 3026                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
 3027                             stcb->sctp_ep, stcb, NULL);
 3028                 }
 3029                 /*
 3030                  * send ASCONF if parameters are pending and ASCONFs are
 3031                  * allowed (eg. addresses changed when init/cookie echo were
 3032                  * in flight)
 3033                  */
 3034                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
 3035                     (stcb->asoc.asconf_supported == 1) &&
 3036                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
 3037 #ifdef SCTP_TIMER_BASED_ASCONF
 3038                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
 3039                             stcb->sctp_ep, stcb,
 3040                             stcb->asoc.primary_destination);
 3041 #else
 3042                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
 3043                             SCTP_ADDR_NOT_LOCKED);
 3044 #endif
 3045                 }
 3046         }
 3047 closed_socket:
 3048         /* Toss the cookie if I can */
 3049         sctp_toss_old_cookies(stcb, asoc);
 3050         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
 3051                 /* Restart the timer if we have pending data */
 3052                 struct sctp_tmit_chunk *chk;
 3053 
 3054                 chk = TAILQ_FIRST(&asoc->sent_queue);
 3055                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
 3056         }
 3057 }
 3058 
 3059 static void
 3060 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
 3061     struct sctp_tcb *stcb)
 3062 {
 3063         struct sctp_nets *net;
 3064         struct sctp_tmit_chunk *lchk;
 3065         struct sctp_ecne_chunk bkup;
 3066         uint8_t override_bit;
 3067         uint32_t tsn, window_data_tsn;
 3068         int len;
 3069         unsigned int pkt_cnt;
 3070 
 3071         len = ntohs(cp->ch.chunk_length);
 3072         if ((len != sizeof(struct sctp_ecne_chunk)) &&
 3073             (len != sizeof(struct old_sctp_ecne_chunk))) {
 3074                 return;
 3075         }
 3076         if (len == sizeof(struct old_sctp_ecne_chunk)) {
 3077                 /* Its the old format */
 3078                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
 3079                 bkup.num_pkts_since_cwr = htonl(1);
 3080                 cp = &bkup;
 3081         }
 3082         SCTP_STAT_INCR(sctps_recvecne);
 3083         tsn = ntohl(cp->tsn);
 3084         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
 3085         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
 3086         if (lchk == NULL) {
 3087                 window_data_tsn = stcb->asoc.sending_seq - 1;
 3088         } else {
 3089                 window_data_tsn = lchk->rec.data.tsn;
 3090         }
 3091 
 3092         /* Find where it was sent to if possible. */
 3093         net = NULL;
 3094         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
 3095                 if (lchk->rec.data.tsn == tsn) {
 3096                         net = lchk->whoTo;
 3097                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
 3098                         break;
 3099                 }
 3100                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
 3101                         break;
 3102                 }
 3103         }
 3104         if (net == NULL) {
 3105                 /*
 3106                  * What to do. A previous send of a CWR was possibly lost.
 3107                  * See how old it is, we may have it marked on the actual
 3108                  * net.
 3109                  */
 3110                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 3111                         if (tsn == net->last_cwr_tsn) {
 3112                                 /* Found him, send it off */
 3113                                 break;
 3114                         }
 3115                 }
 3116                 if (net == NULL) {
 3117                         /*
 3118                          * If we reach here, we need to send a special CWR
 3119                          * that says hey, we did this a long time ago and
 3120                          * you lost the response.
 3121                          */
 3122                         net = TAILQ_FIRST(&stcb->asoc.nets);
 3123                         if (net == NULL) {
 3124                                 /* TSNH */
 3125                                 return;
 3126                         }
 3127                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
 3128                 } else {
 3129                         override_bit = 0;
 3130                 }
 3131         } else {
 3132                 override_bit = 0;
 3133         }
 3134         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
 3135             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
 3136                 /*
 3137                  * JRS - Use the congestion control given in the pluggable
 3138                  * CC module
 3139                  */
 3140                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
 3141                 /*
 3142                  * We reduce once every RTT. So we will only lower cwnd at
 3143                  * the next sending seq i.e. the window_data_tsn
 3144                  */
 3145                 net->cwr_window_tsn = window_data_tsn;
 3146                 net->ecn_ce_pkt_cnt += pkt_cnt;
 3147                 net->lost_cnt = pkt_cnt;
 3148                 net->last_cwr_tsn = tsn;
 3149         } else {
 3150                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
 3151                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
 3152                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
 3153                         /*
 3154                          * Another loss in the same window update how many
 3155                          * marks/packets lost we have had.
 3156                          */
 3157                         int cnt = 1;
 3158 
 3159                         if (pkt_cnt > net->lost_cnt) {
 3160                                 /* Should be the case */
 3161                                 cnt = (pkt_cnt - net->lost_cnt);
 3162                                 net->ecn_ce_pkt_cnt += cnt;
 3163                         }
 3164                         net->lost_cnt = pkt_cnt;
 3165                         net->last_cwr_tsn = tsn;
 3166                         /*
 3167                          * Most CC functions will ignore this call, since we
 3168                          * are in-window yet of the initial CE the peer saw.
 3169                          */
 3170                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
 3171                 }
 3172         }
 3173         /*
 3174          * We always send a CWR this way if our previous one was lost our
 3175          * peer will get an update, or if it is not time again to reduce we
 3176          * still get the cwr to the peer. Note we set the override when we
 3177          * could not find the TSN on the chunk or the destination network.
 3178          */
 3179         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
 3180 }
 3181 
 3182 static void
 3183 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
 3184 {
 3185         /*
 3186          * Here we get a CWR from the peer. We must look in the outqueue and
 3187          * make sure that we have a covered ECNE in the control chunk part.
 3188          * If so remove it.
 3189          */
 3190         struct sctp_tmit_chunk *chk, *nchk;
 3191         struct sctp_ecne_chunk *ecne;
 3192         int override;
 3193         uint32_t cwr_tsn;
 3194 
 3195         cwr_tsn = ntohl(cp->tsn);
 3196         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
 3197         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
 3198                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
 3199                         continue;
 3200                 }
 3201                 if ((override == 0) && (chk->whoTo != net)) {
 3202                         /* Must be from the right src unless override is set */
 3203                         continue;
 3204                 }
 3205                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
 3206                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
 3207                         /* this covers this ECNE, we can remove it */
 3208                         stcb->asoc.ecn_echo_cnt_onq--;
 3209                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
 3210                             sctp_next);
 3211                         stcb->asoc.ctrl_queue_cnt--;
 3212                         sctp_m_freem(chk->data);
 3213                         chk->data = NULL;
 3214                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 3215                         if (override == 0) {
 3216                                 break;
 3217                         }
 3218                 }
 3219         }
 3220 }
 3221 
 3222 static void
 3223 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
 3224     struct sctp_tcb *stcb, struct sctp_nets *net)
 3225 {
 3226         struct sctp_association *asoc;
 3227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3228         struct socket *so;
 3229 #endif
 3230 
 3231         SCTPDBG(SCTP_DEBUG_INPUT2,
 3232             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
 3233         if (stcb == NULL)
 3234                 return;
 3235 
 3236         asoc = &stcb->asoc;
 3237         /* process according to association state */
 3238         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 3239                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
 3240                 SCTPDBG(SCTP_DEBUG_INPUT2,
 3241                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
 3242                 SCTP_TCB_UNLOCK(stcb);
 3243                 return;
 3244         }
 3245         /* notify upper layer protocol */
 3246         if (stcb->sctp_socket) {
 3247                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 3248         }
 3249 #ifdef INVARIANTS
 3250         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 3251             !TAILQ_EMPTY(&asoc->sent_queue) ||
 3252             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
 3253                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
 3254         }
 3255 #endif
 3256         /* stop the timer */
 3257         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
 3258             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
 3259         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 3260         /* free the TCB */
 3261         SCTPDBG(SCTP_DEBUG_INPUT2,
 3262             "sctp_handle_shutdown_complete: calls free-asoc\n");
 3263 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3264         so = SCTP_INP_SO(stcb->sctp_ep);
 3265         atomic_add_int(&stcb->asoc.refcnt, 1);
 3266         SCTP_TCB_UNLOCK(stcb);
 3267         SCTP_SOCKET_LOCK(so, 1);
 3268         SCTP_TCB_LOCK(stcb);
 3269         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 3270 #endif
 3271         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 3272             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
 3273 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3274         SCTP_SOCKET_UNLOCK(so, 1);
 3275 #endif
 3276         return;
 3277 }
 3278 
 3279 static int
 3280 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
 3281     struct sctp_nets *net, uint8_t flg)
 3282 {
 3283         switch (desc->chunk_type) {
 3284         case SCTP_DATA:
 3285                 /* find the tsn to resend (possibly */
 3286                 {
 3287                         uint32_t tsn;
 3288                         struct sctp_tmit_chunk *tp1;
 3289 
 3290                         tsn = ntohl(desc->tsn_ifany);
 3291                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3292                                 if (tp1->rec.data.tsn == tsn) {
 3293                                         /* found it */
 3294                                         break;
 3295                                 }
 3296                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
 3297                                         /* not found */
 3298                                         tp1 = NULL;
 3299                                         break;
 3300                                 }
 3301                         }
 3302                         if (tp1 == NULL) {
 3303                                 /*
 3304                                  * Do it the other way , aka without paying
 3305                                  * attention to queue seq order.
 3306                                  */
 3307                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
 3308                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3309                                         if (tp1->rec.data.tsn == tsn) {
 3310                                                 /* found it */
 3311                                                 break;
 3312                                         }
 3313                                 }
 3314                         }
 3315                         if (tp1 == NULL) {
 3316                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
 3317                         }
 3318                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
 3319                                 uint8_t *ddp;
 3320 
 3321                                 if (((flg & SCTP_BADCRC) == 0) &&
 3322                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
 3323                                         return (0);
 3324                                 }
 3325                                 if ((stcb->asoc.peers_rwnd == 0) &&
 3326                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
 3327                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
 3328                                         return (0);
 3329                                 }
 3330                                 if (stcb->asoc.peers_rwnd == 0 &&
 3331                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
 3332                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
 3333                                         return (0);
 3334                                 }
 3335                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
 3336                                     sizeof(struct sctp_data_chunk));
 3337                                 {
 3338                                         unsigned int iii;
 3339 
 3340                                         for (iii = 0; iii < sizeof(desc->data_bytes);
 3341                                             iii++) {
 3342                                                 if (ddp[iii] != desc->data_bytes[iii]) {
 3343                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
 3344                                                         return (-1);
 3345                                                 }
 3346                                         }
 3347                                 }
 3348 
 3349                                 if (tp1->do_rtt) {
 3350                                         /*
 3351                                          * this guy had a RTO calculation
 3352                                          * pending on it, cancel it
 3353                                          */
 3354                                         if (tp1->whoTo->rto_needed == 0) {
 3355                                                 tp1->whoTo->rto_needed = 1;
 3356                                         }
 3357                                         tp1->do_rtt = 0;
 3358                                 }
 3359                                 SCTP_STAT_INCR(sctps_pdrpmark);
 3360                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
 3361                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3362                                 /*
 3363                                  * mark it as if we were doing a FR, since
 3364                                  * we will be getting gap ack reports behind
 3365                                  * the info from the router.
 3366                                  */
 3367                                 tp1->rec.data.doing_fast_retransmit = 1;
 3368                                 /*
 3369                                  * mark the tsn with what sequences can
 3370                                  * cause a new FR.
 3371                                  */
 3372                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 3373                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 3374                                 } else {
 3375                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
 3376                                 }
 3377 
 3378                                 /* restart the timer */
 3379                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 3380                                     stcb, tp1->whoTo,
 3381                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
 3382                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 3383                                     stcb, tp1->whoTo);
 3384 
 3385                                 /* fix counts and things */
 3386                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 3387                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
 3388                                             tp1->whoTo->flight_size,
 3389                                             tp1->book_size,
 3390                                             (uint32_t)(uintptr_t)stcb,
 3391                                             tp1->rec.data.tsn);
 3392                                 }
 3393                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 3394                                         sctp_flight_size_decrease(tp1);
 3395                                         sctp_total_flight_decrease(stcb, tp1);
 3396                                 }
 3397                                 tp1->sent = SCTP_DATAGRAM_RESEND;
 3398                         } {
 3399                                 /* audit code */
 3400                                 unsigned int audit;
 3401 
 3402                                 audit = 0;
 3403                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
 3404                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
 3405                                                 audit++;
 3406                                 }
 3407                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
 3408                                     sctp_next) {
 3409                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
 3410                                                 audit++;
 3411                                 }
 3412                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
 3413                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
 3414                                             audit, stcb->asoc.sent_queue_retran_cnt);
 3415 #ifndef SCTP_AUDITING_ENABLED
 3416                                         stcb->asoc.sent_queue_retran_cnt = audit;
 3417 #endif
 3418                                 }
 3419                         }
 3420                 }
 3421                 break;
 3422         case SCTP_ASCONF:
 3423                 {
 3424                         struct sctp_tmit_chunk *asconf;
 3425 
 3426                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
 3427                             sctp_next) {
 3428                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
 3429                                         break;
 3430                                 }
 3431                         }
 3432                         if (asconf) {
 3433                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 3434                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3435                                 asconf->sent = SCTP_DATAGRAM_RESEND;
 3436                                 asconf->snd_count--;
 3437                         }
 3438                 }
 3439                 break;
 3440         case SCTP_INITIATION:
 3441                 /* resend the INIT */
 3442                 stcb->asoc.dropped_special_cnt++;
 3443                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
 3444                         /*
 3445                          * If we can get it in, in a few attempts we do
 3446                          * this, otherwise we let the timer fire.
 3447                          */
 3448                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
 3449                             stcb, net,
 3450                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
 3451                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 3452                 }
 3453                 break;
 3454         case SCTP_SELECTIVE_ACK:
 3455         case SCTP_NR_SELECTIVE_ACK:
 3456                 /* resend the sack */
 3457                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
 3458                 break;
 3459         case SCTP_HEARTBEAT_REQUEST:
 3460                 /* resend a demand HB */
 3461                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
 3462                         /*
 3463                          * Only retransmit if we KNOW we wont destroy the
 3464                          * tcb
 3465                          */
 3466                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 3467                 }
 3468                 break;
 3469         case SCTP_SHUTDOWN:
 3470                 sctp_send_shutdown(stcb, net);
 3471                 break;
 3472         case SCTP_SHUTDOWN_ACK:
 3473                 sctp_send_shutdown_ack(stcb, net);
 3474                 break;
 3475         case SCTP_COOKIE_ECHO:
 3476                 {
 3477                         struct sctp_tmit_chunk *cookie;
 3478 
 3479                         cookie = NULL;
 3480                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
 3481                             sctp_next) {
 3482                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 3483                                         break;
 3484                                 }
 3485                         }
 3486                         if (cookie) {
 3487                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
 3488                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3489                                 cookie->sent = SCTP_DATAGRAM_RESEND;
 3490                                 sctp_stop_all_cookie_timers(stcb);
 3491                         }
 3492                 }
 3493                 break;
 3494         case SCTP_COOKIE_ACK:
 3495                 sctp_send_cookie_ack(stcb);
 3496                 break;
 3497         case SCTP_ASCONF_ACK:
 3498                 /* resend last asconf ack */
 3499                 sctp_send_asconf_ack(stcb);
 3500                 break;
 3501         case SCTP_IFORWARD_CUM_TSN:
 3502         case SCTP_FORWARD_CUM_TSN:
 3503                 send_forward_tsn(stcb, &stcb->asoc);
 3504                 break;
 3505                 /* can't do anything with these */
 3506         case SCTP_PACKET_DROPPED:
 3507         case SCTP_INITIATION_ACK:       /* this should not happen */
 3508         case SCTP_HEARTBEAT_ACK:
 3509         case SCTP_ABORT_ASSOCIATION:
 3510         case SCTP_OPERATION_ERROR:
 3511         case SCTP_SHUTDOWN_COMPLETE:
 3512         case SCTP_ECN_ECHO:
 3513         case SCTP_ECN_CWR:
 3514         default:
 3515                 break;
 3516         }
 3517         return (0);
 3518 }
 3519 
 3520 void
 3521 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
 3522 {
 3523         uint32_t i;
 3524         uint16_t temp;
 3525 
 3526         /*
 3527          * We set things to 0xffffffff since this is the last delivered
 3528          * sequence and we will be sending in 0 after the reset.
 3529          */
 3530 
 3531         if (number_entries) {
 3532                 for (i = 0; i < number_entries; i++) {
 3533                         temp = ntohs(list[i]);
 3534                         if (temp >= stcb->asoc.streamincnt) {
 3535                                 continue;
 3536                         }
 3537                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
 3538                 }
 3539         } else {
 3540                 list = NULL;
 3541                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
 3542                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
 3543                 }
 3544         }
 3545         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
 3546 }
 3547 
 3548 static void
 3549 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
 3550 {
 3551         uint32_t i;
 3552         uint16_t temp;
 3553 
 3554         if (number_entries > 0) {
 3555                 for (i = 0; i < number_entries; i++) {
 3556                         temp = ntohs(list[i]);
 3557                         if (temp >= stcb->asoc.streamoutcnt) {
 3558                                 /* no such stream */
 3559                                 continue;
 3560                         }
 3561                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
 3562                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
 3563                 }
 3564         } else {
 3565                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3566                         stcb->asoc.strmout[i].next_mid_ordered = 0;
 3567                         stcb->asoc.strmout[i].next_mid_unordered = 0;
 3568                 }
 3569         }
 3570         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
 3571 }
 3572 
 3573 static void
 3574 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
 3575 {
 3576         uint32_t i;
 3577         uint16_t temp;
 3578 
 3579         if (number_entries > 0) {
 3580                 for (i = 0; i < number_entries; i++) {
 3581                         temp = ntohs(list[i]);
 3582                         if (temp >= stcb->asoc.streamoutcnt) {
 3583                                 /* no such stream */
 3584                                 continue;
 3585                         }
 3586                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
 3587                 }
 3588         } else {
 3589                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3590                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
 3591                 }
 3592         }
 3593 }
 3594 
 3595 
 3596 struct sctp_stream_reset_request *
 3597 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
 3598 {
 3599         struct sctp_association *asoc;
 3600         struct sctp_chunkhdr *ch;
 3601         struct sctp_stream_reset_request *r;
 3602         struct sctp_tmit_chunk *chk;
 3603         int len, clen;
 3604 
 3605         asoc = &stcb->asoc;
 3606         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
 3607                 asoc->stream_reset_outstanding = 0;
 3608                 return (NULL);
 3609         }
 3610         if (stcb->asoc.str_reset == NULL) {
 3611                 asoc->stream_reset_outstanding = 0;
 3612                 return (NULL);
 3613         }
 3614         chk = stcb->asoc.str_reset;
 3615         if (chk->data == NULL) {
 3616                 return (NULL);
 3617         }
 3618         if (bchk) {
 3619                 /* he wants a copy of the chk pointer */
 3620                 *bchk = chk;
 3621         }
 3622         clen = chk->send_size;
 3623         ch = mtod(chk->data, struct sctp_chunkhdr *);
 3624         r = (struct sctp_stream_reset_request *)(ch + 1);
 3625         if (ntohl(r->request_seq) == seq) {
 3626                 /* found it */
 3627                 return (r);
 3628         }
 3629         len = SCTP_SIZE32(ntohs(r->ph.param_length));
 3630         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
 3631                 /* move to the next one, there can only be a max of two */
 3632                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
 3633                 if (ntohl(r->request_seq) == seq) {
 3634                         return (r);
 3635                 }
 3636         }
 3637         /* that seq is not here */
 3638         return (NULL);
 3639 }
 3640 
 3641 static void
 3642 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
 3643 {
 3644         struct sctp_association *asoc;
 3645         struct sctp_tmit_chunk *chk;
 3646 
 3647         asoc = &stcb->asoc;
 3648         chk = asoc->str_reset;
 3649         if (chk == NULL) {
 3650                 return;
 3651         }
 3652         asoc->str_reset = NULL;
 3653         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
 3654             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
 3655         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 3656         asoc->ctrl_queue_cnt--;
 3657         if (chk->data) {
 3658                 sctp_m_freem(chk->data);
 3659                 chk->data = NULL;
 3660         }
 3661         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 3662 }
 3663 
 3664 
 3665 static int
 3666 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
 3667     uint32_t seq, uint32_t action,
 3668     struct sctp_stream_reset_response *respin)
 3669 {
 3670         uint16_t type;
 3671         int lparam_len;
 3672         struct sctp_association *asoc = &stcb->asoc;
 3673         struct sctp_tmit_chunk *chk;
 3674         struct sctp_stream_reset_request *req_param;
 3675         struct sctp_stream_reset_out_request *req_out_param;
 3676         struct sctp_stream_reset_in_request *req_in_param;
 3677         uint32_t number_entries;
 3678 
 3679         if (asoc->stream_reset_outstanding == 0) {
 3680                 /* duplicate */
 3681                 return (0);
 3682         }
 3683         if (seq == stcb->asoc.str_reset_seq_out) {
 3684                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
 3685                 if (req_param != NULL) {
 3686                         stcb->asoc.str_reset_seq_out++;
 3687                         type = ntohs(req_param->ph.param_type);
 3688                         lparam_len = ntohs(req_param->ph.param_length);
 3689                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
 3690                                 int no_clear = 0;
 3691 
 3692                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
 3693                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
 3694                                 asoc->stream_reset_out_is_outstanding = 0;
 3695                                 if (asoc->stream_reset_outstanding)
 3696                                         asoc->stream_reset_outstanding--;
 3697                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3698                                         /* do it */
 3699                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
 3700                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3701                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
 3702                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
 3703                                         /*
 3704                                          * Set it up so we don't stop
 3705                                          * retransmitting
 3706                                          */
 3707                                         asoc->stream_reset_outstanding++;
 3708                                         stcb->asoc.str_reset_seq_out--;
 3709                                         asoc->stream_reset_out_is_outstanding = 1;
 3710                                         no_clear = 1;
 3711                                 } else {
 3712                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
 3713                                 }
 3714                                 if (no_clear == 0) {
 3715                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
 3716                                 }
 3717                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
 3718                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
 3719                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
 3720                                 if (asoc->stream_reset_outstanding)
 3721                                         asoc->stream_reset_outstanding--;
 3722                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3723                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
 3724                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
 3725                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3726                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
 3727                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
 3728                                 }
 3729                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
 3730                                 /* Ok we now may have more streams */
 3731                                 int num_stream;
 3732 
 3733                                 num_stream = stcb->asoc.strm_pending_add_size;
 3734                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
 3735                                         /* TSNH */
 3736                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
 3737                                 }
 3738                                 stcb->asoc.strm_pending_add_size = 0;
 3739                                 if (asoc->stream_reset_outstanding)
 3740                                         asoc->stream_reset_outstanding--;
 3741                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3742                                         /* Put the new streams into effect */
 3743                                         int i;
 3744 
 3745                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
 3746                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
 3747                                         }
 3748                                         asoc->streamoutcnt += num_stream;
 3749                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
 3750                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3751                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3752                                             SCTP_STREAM_CHANGE_DENIED);
 3753                                 } else {
 3754                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3755                                             SCTP_STREAM_CHANGE_FAILED);
 3756                                 }
 3757                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
 3758                                 if (asoc->stream_reset_outstanding)
 3759                                         asoc->stream_reset_outstanding--;
 3760                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3761                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3762                                             SCTP_STREAM_CHANGE_DENIED);
 3763                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3764                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
 3765                                             SCTP_STREAM_CHANGE_FAILED);
 3766                                 }
 3767                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
 3768                                 /**
 3769                                  * a) Adopt the new in tsn.
 3770                                  * b) reset the map
 3771                                  * c) Adopt the new out-tsn
 3772                                  */
 3773                                 struct sctp_stream_reset_response_tsn *resp;
 3774                                 struct sctp_forward_tsn_chunk fwdtsn;
 3775                                 int abort_flag = 0;
 3776 
 3777                                 if (respin == NULL) {
 3778                                         /* huh ? */
 3779                                         return (0);
 3780                                 }
 3781                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
 3782                                         return (0);
 3783                                 }
 3784                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
 3785                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
 3786                                         asoc->stream_reset_outstanding--;
 3787                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
 3788                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 3789                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
 3790                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
 3791                                         if (abort_flag) {
 3792                                                 return (1);
 3793                                         }
 3794                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
 3795                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 3796                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 3797                                         }
 3798                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
 3799                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
 3800                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
 3801 
 3802                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
 3803                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
 3804 
 3805                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
 3806                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
 3807 
 3808                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
 3809                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
 3810                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
 3811                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
 3812                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
 3813                                             SCTP_ASSOC_RESET_DENIED);
 3814                                 } else {
 3815                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
 3816                                             SCTP_ASSOC_RESET_FAILED);
 3817                                 }
 3818                         }
 3819                         /* get rid of the request and get the request flags */
 3820                         if (asoc->stream_reset_outstanding == 0) {
 3821                                 sctp_clean_up_stream_reset(stcb);
 3822                         }
 3823                 }
 3824         }
 3825         if (asoc->stream_reset_outstanding == 0) {
 3826                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
 3827         }
 3828         return (0);
 3829 }
 3830 
 3831 static void
 3832 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
 3833     struct sctp_tmit_chunk *chk,
 3834     struct sctp_stream_reset_in_request *req, int trunc)
 3835 {
 3836         uint32_t seq;
 3837         int len, i;
 3838         int number_entries;
 3839         uint16_t temp;
 3840 
 3841         /*
 3842          * peer wants me to send a str-reset to him for my outgoing seq's if
 3843          * seq_in is right.
 3844          */
 3845         struct sctp_association *asoc = &stcb->asoc;
 3846 
 3847         seq = ntohl(req->request_seq);
 3848         if (asoc->str_reset_seq_in == seq) {
 3849                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3850                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
 3851                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3852                 } else if (trunc) {
 3853                         /* Can't do it, since they exceeded our buffer size  */
 3854                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3855                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
 3856                         len = ntohs(req->ph.param_length);
 3857                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
 3858                         if (number_entries) {
 3859                                 for (i = 0; i < number_entries; i++) {
 3860                                         temp = ntohs(req->list_of_streams[i]);
 3861                                         if (temp >= stcb->asoc.streamoutcnt) {
 3862                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3863                                                 goto bad_boy;
 3864                                         }
 3865                                         req->list_of_streams[i] = temp;
 3866                                 }
 3867                                 for (i = 0; i < number_entries; i++) {
 3868                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
 3869                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
 3870                                         }
 3871                                 }
 3872                         } else {
 3873                                 /* Its all */
 3874                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3875                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
 3876                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
 3877                                 }
 3878                         }
 3879                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3880                 } else {
 3881                         /* Can't do it, since we have sent one out */
 3882                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
 3883                 }
 3884 bad_boy:
 3885                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3886                 asoc->str_reset_seq_in++;
 3887         } else if (asoc->str_reset_seq_in - 1 == seq) {
 3888                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 3889         } else if (asoc->str_reset_seq_in - 2 == seq) {
 3890                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 3891         } else {
 3892                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 3893         }
 3894         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
 3895 }
 3896 
 3897 static int
 3898 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
 3899     struct sctp_tmit_chunk *chk,
 3900     struct sctp_stream_reset_tsn_request *req)
 3901 {
 3902         /* reset all in and out and update the tsn */
 3903         /*
 3904          * A) reset my str-seq's on in and out. B) Select a receive next,
 3905          * and set cum-ack to it. Also process this selected number as a
 3906          * fwd-tsn as well. C) set in the response my next sending seq.
 3907          */
 3908         struct sctp_forward_tsn_chunk fwdtsn;
 3909         struct sctp_association *asoc = &stcb->asoc;
 3910         int abort_flag = 0;
 3911         uint32_t seq;
 3912 
 3913         seq = ntohl(req->request_seq);
 3914         if (asoc->str_reset_seq_in == seq) {
 3915                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
 3916                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 3917                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3918                 } else {
 3919                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
 3920                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 3921                         fwdtsn.ch.chunk_flags = 0;
 3922                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
 3923                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
 3924                         if (abort_flag) {
 3925                                 return (1);
 3926                         }
 3927                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
 3928                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 3929                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 3930                         }
 3931                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
 3932                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
 3933                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
 3934                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 3935                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
 3936                         atomic_add_int(&asoc->sending_seq, 1);
 3937                         /* save off historical data for retrans */
 3938                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
 3939                         asoc->last_sending_seq[0] = asoc->sending_seq;
 3940                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
 3941                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
 3942                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
 3943                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
 3944                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3945                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
 3946                 }
 3947                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
 3948                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
 3949                 asoc->str_reset_seq_in++;
 3950         } else if (asoc->str_reset_seq_in - 1 == seq) {
 3951                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
 3952                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
 3953         } else if (asoc->str_reset_seq_in - 2 == seq) {
 3954                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
 3955                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
 3956         } else {
 3957                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 3958         }
 3959         return (0);
 3960 }
 3961 
 3962 static void
 3963 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
 3964     struct sctp_tmit_chunk *chk,
 3965     struct sctp_stream_reset_out_request *req, int trunc)
 3966 {
 3967         uint32_t seq, tsn;
 3968         int number_entries, len;
 3969         struct sctp_association *asoc = &stcb->asoc;
 3970 
 3971         seq = ntohl(req->request_seq);
 3972 
 3973         /* now if its not a duplicate we process it */
 3974         if (asoc->str_reset_seq_in == seq) {
 3975                 len = ntohs(req->ph.param_length);
 3976                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
 3977                 /*
 3978                  * the sender is resetting, handle the list issue.. we must
 3979                  * a) verify if we can do the reset, if so no problem b) If
 3980                  * we can't do the reset we must copy the request. c) queue
 3981                  * it, and setup the data in processor to trigger it off
 3982                  * when needed and dequeue all the queued data.
 3983                  */
 3984                 tsn = ntohl(req->send_reset_at_tsn);
 3985 
 3986                 /* move the reset action back one */
 3987                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
 3988                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
 3989                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3990                 } else if (trunc) {
 3991                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 3992                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
 3993                         /* we can do it now */
 3994                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
 3995                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 3996                 } else {
 3997                         /*
 3998                          * we must queue it up and thus wait for the TSN's
 3999                          * to arrive that are at or before tsn
 4000                          */
 4001                         struct sctp_stream_reset_list *liste;
 4002                         int siz;
 4003 
 4004                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
 4005                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
 4006                             siz, SCTP_M_STRESET);
 4007                         if (liste == NULL) {
 4008                                 /* gak out of memory */
 4009                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4010                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4011                                 return;
 4012                         }
 4013                         liste->seq = seq;
 4014                         liste->tsn = tsn;
 4015                         liste->number_entries = number_entries;
 4016                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
 4017                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
 4018                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
 4019                 }
 4020                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4021                 asoc->str_reset_seq_in++;
 4022         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 4023                 /*
 4024                  * one seq back, just echo back last action since my
 4025                  * response was lost.
 4026                  */
 4027                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4028         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 4029                 /*
 4030                  * two seq back, just echo back last action since my
 4031                  * response was lost.
 4032                  */
 4033                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 4034         } else {
 4035                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 4036         }
 4037 }
 4038 
 4039 static void
 4040 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
 4041     struct sctp_stream_reset_add_strm *str_add)
 4042 {
 4043         /*
 4044          * Peer is requesting to add more streams. If its within our
 4045          * max-streams we will allow it.
 4046          */
 4047         uint32_t num_stream, i;
 4048         uint32_t seq;
 4049         struct sctp_association *asoc = &stcb->asoc;
 4050         struct sctp_queued_to_read *ctl, *nctl;
 4051 
 4052         /* Get the number. */
 4053         seq = ntohl(str_add->request_seq);
 4054         num_stream = ntohs(str_add->number_of_streams);
 4055         /* Now what would be the new total? */
 4056         if (asoc->str_reset_seq_in == seq) {
 4057                 num_stream += stcb->asoc.streamincnt;
 4058                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
 4059                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 4060                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4061                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
 4062                     (num_stream > 0xffff)) {
 4063                         /* We must reject it they ask for to many */
 4064         denied:
 4065                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4066                 } else {
 4067                         /* Ok, we can do that :-) */
 4068                         struct sctp_stream_in *oldstrm;
 4069 
 4070                         /* save off the old */
 4071                         oldstrm = stcb->asoc.strmin;
 4072                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
 4073                             (num_stream * sizeof(struct sctp_stream_in)),
 4074                             SCTP_M_STRMI);
 4075                         if (stcb->asoc.strmin == NULL) {
 4076                                 stcb->asoc.strmin = oldstrm;
 4077                                 goto denied;
 4078                         }
 4079                         /* copy off the old data */
 4080                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
 4081                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
 4082                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
 4083                                 stcb->asoc.strmin[i].sid = i;
 4084                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
 4085                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
 4086                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
 4087                                 /* now anything on those queues? */
 4088                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
 4089                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
 4090                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
 4091                                 }
 4092                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
 4093                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
 4094                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
 4095                                 }
 4096                         }
 4097                         /* Init the new streams */
 4098                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
 4099                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
 4100                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
 4101                                 stcb->asoc.strmin[i].sid = i;
 4102                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
 4103                                 stcb->asoc.strmin[i].pd_api_started = 0;
 4104                                 stcb->asoc.strmin[i].delivery_started = 0;
 4105                         }
 4106                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
 4107                         /* update the size */
 4108                         stcb->asoc.streamincnt = num_stream;
 4109                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 4110                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
 4111                 }
 4112                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4113                 asoc->str_reset_seq_in++;
 4114         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 4115                 /*
 4116                  * one seq back, just echo back last action since my
 4117                  * response was lost.
 4118                  */
 4119                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4120         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 4121                 /*
 4122                  * two seq back, just echo back last action since my
 4123                  * response was lost.
 4124                  */
 4125                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 4126         } else {
 4127                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 4128 
 4129         }
 4130 }
 4131 
 4132 static void
 4133 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
 4134     struct sctp_stream_reset_add_strm *str_add)
 4135 {
 4136         /*
 4137          * Peer is requesting to add more streams. If its within our
 4138          * max-streams we will allow it.
 4139          */
 4140         uint16_t num_stream;
 4141         uint32_t seq;
 4142         struct sctp_association *asoc = &stcb->asoc;
 4143 
 4144         /* Get the number. */
 4145         seq = ntohl(str_add->request_seq);
 4146         num_stream = ntohs(str_add->number_of_streams);
 4147         /* Now what would be the new total? */
 4148         if (asoc->str_reset_seq_in == seq) {
 4149                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
 4150                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
 4151                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4152                 } else if (stcb->asoc.stream_reset_outstanding) {
 4153                         /* We must reject it we have something pending */
 4154                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
 4155                 } else {
 4156                         /* Ok, we can do that :-) */
 4157                         int mychk;
 4158 
 4159                         mychk = stcb->asoc.streamoutcnt;
 4160                         mychk += num_stream;
 4161                         if (mychk < 0x10000) {
 4162                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
 4163                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
 4164                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4165                                 }
 4166                         } else {
 4167                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
 4168                         }
 4169                 }
 4170                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
 4171                 asoc->str_reset_seq_in++;
 4172         } else if ((asoc->str_reset_seq_in - 1) == seq) {
 4173                 /*
 4174                  * one seq back, just echo back last action since my
 4175                  * response was lost.
 4176                  */
 4177                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
 4178         } else if ((asoc->str_reset_seq_in - 2) == seq) {
 4179                 /*
 4180                  * two seq back, just echo back last action since my
 4181                  * response was lost.
 4182                  */
 4183                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
 4184         } else {
 4185                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
 4186         }
 4187 }
 4188 
 4189 #ifdef __GNUC__
 4190 __attribute__((noinline))
 4191 #endif
 4192 static int
 4193 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
 4194     struct sctp_chunkhdr *ch_req)
 4195 {
 4196         uint16_t remaining_length, param_len, ptype;
 4197         struct sctp_paramhdr pstore;
 4198         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
 4199         uint32_t seq = 0;
 4200         int num_req = 0;
 4201         int trunc = 0;
 4202         struct sctp_tmit_chunk *chk;
 4203         struct sctp_chunkhdr *ch;
 4204         struct sctp_paramhdr *ph;
 4205         int ret_code = 0;
 4206         int num_param = 0;
 4207 
 4208         /* now it may be a reset or a reset-response */
 4209         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
 4210 
 4211         /* setup for adding the response */
 4212         sctp_alloc_a_chunk(stcb, chk);
 4213         if (chk == NULL) {
 4214                 return (ret_code);
 4215         }
 4216         chk->copy_by_ref = 0;
 4217         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
 4218         chk->rec.chunk_id.can_take_data = 0;
 4219         chk->flags = 0;
 4220         chk->asoc = &stcb->asoc;
 4221         chk->no_fr_allowed = 0;
 4222         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
 4223         chk->book_size_scale = 0;
 4224         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
 4225         if (chk->data == NULL) {
 4226 strres_nochunk:
 4227                 if (chk->data) {
 4228                         sctp_m_freem(chk->data);
 4229                         chk->data = NULL;
 4230                 }
 4231                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 4232                 return (ret_code);
 4233         }
 4234         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
 4235 
 4236         /* setup chunk parameters */
 4237         chk->sent = SCTP_DATAGRAM_UNSENT;
 4238         chk->snd_count = 0;
 4239         chk->whoTo = NULL;
 4240 
 4241         ch = mtod(chk->data, struct sctp_chunkhdr *);
 4242         ch->chunk_type = SCTP_STREAM_RESET;
 4243         ch->chunk_flags = 0;
 4244         ch->chunk_length = htons(chk->send_size);
 4245         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
 4246         offset += sizeof(struct sctp_chunkhdr);
 4247         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
 4248                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
 4249                 if (ph == NULL) {
 4250                         /* TSNH */
 4251                         break;
 4252                 }
 4253                 param_len = ntohs(ph->param_length);
 4254                 if ((param_len > remaining_length) ||
 4255                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
 4256                         /* bad parameter length */
 4257                         break;
 4258                 }
 4259                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
 4260                     (uint8_t *)&cstore);
 4261                 if (ph == NULL) {
 4262                         /* TSNH */
 4263                         break;
 4264                 }
 4265                 ptype = ntohs(ph->param_type);
 4266                 num_param++;
 4267                 if (param_len > sizeof(cstore)) {
 4268                         trunc = 1;
 4269                 } else {
 4270                         trunc = 0;
 4271                 }
 4272                 if (num_param > SCTP_MAX_RESET_PARAMS) {
 4273                         /* hit the max of parameters already sorry.. */
 4274                         break;
 4275                 }
 4276                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
 4277                         struct sctp_stream_reset_out_request *req_out;
 4278 
 4279                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
 4280                                 break;
 4281                         }
 4282                         req_out = (struct sctp_stream_reset_out_request *)ph;
 4283                         num_req++;
 4284                         if (stcb->asoc.stream_reset_outstanding) {
 4285                                 seq = ntohl(req_out->response_seq);
 4286                                 if (seq == stcb->asoc.str_reset_seq_out) {
 4287                                         /* implicit ack */
 4288                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
 4289                                 }
 4290                         }
 4291                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
 4292                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
 4293                         struct sctp_stream_reset_add_strm *str_add;
 4294 
 4295                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
 4296                                 break;
 4297                         }
 4298                         str_add = (struct sctp_stream_reset_add_strm *)ph;
 4299                         num_req++;
 4300                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
 4301                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
 4302                         struct sctp_stream_reset_add_strm *str_add;
 4303 
 4304                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
 4305                                 break;
 4306                         }
 4307                         str_add = (struct sctp_stream_reset_add_strm *)ph;
 4308                         num_req++;
 4309                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
 4310                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
 4311                         struct sctp_stream_reset_in_request *req_in;
 4312 
 4313                         num_req++;
 4314                         req_in = (struct sctp_stream_reset_in_request *)ph;
 4315                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
 4316                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
 4317                         struct sctp_stream_reset_tsn_request *req_tsn;
 4318 
 4319                         num_req++;
 4320                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
 4321                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
 4322                                 ret_code = 1;
 4323                                 goto strres_nochunk;
 4324                         }
 4325                         /* no more */
 4326                         break;
 4327                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
 4328                         struct sctp_stream_reset_response *resp;
 4329                         uint32_t result;
 4330 
 4331                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
 4332                                 break;
 4333                         }
 4334                         resp = (struct sctp_stream_reset_response *)ph;
 4335                         seq = ntohl(resp->response_seq);
 4336                         result = ntohl(resp->result);
 4337                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
 4338                                 ret_code = 1;
 4339                                 goto strres_nochunk;
 4340                         }
 4341                 } else {
 4342                         break;
 4343                 }
 4344                 offset += SCTP_SIZE32(param_len);
 4345                 if (remaining_length >= SCTP_SIZE32(param_len)) {
 4346                         remaining_length -= SCTP_SIZE32(param_len);
 4347                 } else {
 4348                         remaining_length = 0;
 4349                 }
 4350         }
 4351         if (num_req == 0) {
 4352                 /* we have no response free the stuff */
 4353                 goto strres_nochunk;
 4354         }
 4355         /* ok we have a chunk to link in */
 4356         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
 4357             chk,
 4358             sctp_next);
 4359         stcb->asoc.ctrl_queue_cnt++;
 4360         return (ret_code);
 4361 }
 4362 
 4363 /*
 4364  * Handle a router or endpoints report of a packet loss, there are two ways
 4365  * to handle this, either we get the whole packet and must disect it
 4366  * ourselves (possibly with truncation and or corruption) or it is a summary
 4367  * from a middle box that did the disectting for us.
 4368  */
 4369 static void
 4370 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
 4371     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
 4372 {
 4373         uint32_t bottle_bw, on_queue;
 4374         uint16_t trunc_len;
 4375         unsigned int chlen;
 4376         unsigned int at;
 4377         struct sctp_chunk_desc desc;
 4378         struct sctp_chunkhdr *ch;
 4379 
 4380         chlen = ntohs(cp->ch.chunk_length);
 4381         chlen -= sizeof(struct sctp_pktdrop_chunk);
 4382         /* XXX possible chlen underflow */
 4383         if (chlen == 0) {
 4384                 ch = NULL;
 4385                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
 4386                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
 4387         } else {
 4388                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
 4389                 chlen -= sizeof(struct sctphdr);
 4390                 /* XXX possible chlen underflow */
 4391                 memset(&desc, 0, sizeof(desc));
 4392         }
 4393         trunc_len = (uint16_t)ntohs(cp->trunc_len);
 4394         if (trunc_len > limit) {
 4395                 trunc_len = limit;
 4396         }
 4397         /* now the chunks themselves */
 4398         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
 4399                 desc.chunk_type = ch->chunk_type;
 4400                 /* get amount we need to move */
 4401                 at = ntohs(ch->chunk_length);
 4402                 if (at < sizeof(struct sctp_chunkhdr)) {
 4403                         /* corrupt chunk, maybe at the end? */
 4404                         SCTP_STAT_INCR(sctps_pdrpcrupt);
 4405                         break;
 4406                 }
 4407                 if (trunc_len == 0) {
 4408                         /* we are supposed to have all of it */
 4409                         if (at > chlen) {
 4410                                 /* corrupt skip it */
 4411                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
 4412                                 break;
 4413                         }
 4414                 } else {
 4415                         /* is there enough of it left ? */
 4416                         if (desc.chunk_type == SCTP_DATA) {
 4417                                 if (chlen < (sizeof(struct sctp_data_chunk) +
 4418                                     sizeof(desc.data_bytes))) {
 4419                                         break;
 4420                                 }
 4421                         } else {
 4422                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
 4423                                         break;
 4424                                 }
 4425                         }
 4426                 }
 4427                 if (desc.chunk_type == SCTP_DATA) {
 4428                         /* can we get out the tsn? */
 4429                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
 4430                                 SCTP_STAT_INCR(sctps_pdrpmbda);
 4431 
 4432                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
 4433                                 /* yep */
 4434                                 struct sctp_data_chunk *dcp;
 4435                                 uint8_t *ddp;
 4436                                 unsigned int iii;
 4437 
 4438                                 dcp = (struct sctp_data_chunk *)ch;
 4439                                 ddp = (uint8_t *)(dcp + 1);
 4440                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
 4441                                         desc.data_bytes[iii] = ddp[iii];
 4442                                 }
 4443                                 desc.tsn_ifany = dcp->dp.tsn;
 4444                         } else {
 4445                                 /* nope we are done. */
 4446                                 SCTP_STAT_INCR(sctps_pdrpnedat);
 4447                                 break;
 4448                         }
 4449                 } else {
 4450                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
 4451                                 SCTP_STAT_INCR(sctps_pdrpmbct);
 4452                 }
 4453 
 4454                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
 4455                         SCTP_STAT_INCR(sctps_pdrppdbrk);
 4456                         break;
 4457                 }
 4458                 if (SCTP_SIZE32(at) > chlen) {
 4459                         break;
 4460                 }
 4461                 chlen -= SCTP_SIZE32(at);
 4462                 if (chlen < sizeof(struct sctp_chunkhdr)) {
 4463                         /* done, none left */
 4464                         break;
 4465                 }
 4466                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
 4467         }
 4468         /* Now update any rwnd --- possibly */
 4469         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
 4470                 /* From a peer, we get a rwnd report */
 4471                 uint32_t a_rwnd;
 4472 
 4473                 SCTP_STAT_INCR(sctps_pdrpfehos);
 4474 
 4475                 bottle_bw = ntohl(cp->bottle_bw);
 4476                 on_queue = ntohl(cp->current_onq);
 4477                 if (bottle_bw && on_queue) {
 4478                         /* a rwnd report is in here */
 4479                         if (bottle_bw > on_queue)
 4480                                 a_rwnd = bottle_bw - on_queue;
 4481                         else
 4482                                 a_rwnd = 0;
 4483 
 4484                         if (a_rwnd == 0)
 4485                                 stcb->asoc.peers_rwnd = 0;
 4486                         else {
 4487                                 if (a_rwnd > stcb->asoc.total_flight) {
 4488                                         stcb->asoc.peers_rwnd =
 4489                                             a_rwnd - stcb->asoc.total_flight;
 4490                                 } else {
 4491                                         stcb->asoc.peers_rwnd = 0;
 4492                                 }
 4493                                 if (stcb->asoc.peers_rwnd <
 4494                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 4495                                         /* SWS sender side engages */
 4496                                         stcb->asoc.peers_rwnd = 0;
 4497                                 }
 4498                         }
 4499                 }
 4500         } else {
 4501                 SCTP_STAT_INCR(sctps_pdrpfmbox);
 4502         }
 4503 
 4504         /* now middle boxes in sat networks get a cwnd bump */
 4505         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
 4506             (stcb->asoc.sat_t3_loss_recovery == 0) &&
 4507             (stcb->asoc.sat_network)) {
 4508                 /*
 4509                  * This is debatable but for sat networks it makes sense
 4510                  * Note if a T3 timer has went off, we will prohibit any
 4511                  * changes to cwnd until we exit the t3 loss recovery.
 4512                  */
 4513                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
 4514                     net, cp, &bottle_bw, &on_queue);
 4515         }
 4516 }
 4517 
 4518 /*
 4519  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
 4520  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
 4521  * offset: offset into the mbuf chain to first chunkhdr - length: is the
 4522  * length of the complete packet outputs: - length: modified to remaining
 4523  * length after control processing - netp: modified to new sctp_nets after
 4524  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
 4525  * bad packet,...) otherwise return the tcb for this packet
 4526  */
 4527 #ifdef __GNUC__
 4528 __attribute__((noinline))
 4529 #endif
 4530 static struct sctp_tcb *
 4531 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
 4532     struct sockaddr *src, struct sockaddr *dst,
 4533     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
 4534     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
 4535     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
 4536     uint32_t vrf_id, uint16_t port)
 4537 {
 4538         struct sctp_association *asoc;
 4539         struct mbuf *op_err;
 4540         char msg[SCTP_DIAG_INFO_LEN];
 4541         uint32_t vtag_in;
 4542         int num_chunks = 0;     /* number of control chunks processed */
 4543         uint32_t chk_length, contiguous;
 4544         int ret;
 4545         int abort_no_unlock = 0;
 4546         int ecne_seen = 0;
 4547 
 4548         /*
 4549          * How big should this be, and should it be alloc'd? Lets try the
 4550          * d-mtu-ceiling for now (2k) and that should hopefully work ...
 4551          * until we get into jumbo grams and such..
 4552          */
 4553         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
 4554         int got_auth = 0;
 4555         uint32_t auth_offset = 0, auth_len = 0;
 4556         int auth_skipped = 0;
 4557         int asconf_cnt = 0;
 4558 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4559         struct socket *so;
 4560 #endif
 4561 
 4562         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
 4563             iphlen, *offset, length, (void *)stcb);
 4564 
 4565         if (stcb) {
 4566                 SCTP_TCB_LOCK_ASSERT(stcb);
 4567         }
 4568         /* validate chunk header length... */
 4569         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
 4570                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
 4571                     ntohs(ch->chunk_length));
 4572                 *offset = length;
 4573                 return (stcb);
 4574         }
 4575         /*
 4576          * validate the verification tag
 4577          */
 4578         vtag_in = ntohl(sh->v_tag);
 4579 
 4580         if (ch->chunk_type == SCTP_INITIATION) {
 4581                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
 4582                     ntohs(ch->chunk_length), vtag_in);
 4583                 if (vtag_in != 0) {
 4584                         /* protocol error- silently discard... */
 4585                         SCTP_STAT_INCR(sctps_badvtag);
 4586                         if (stcb != NULL) {
 4587                                 SCTP_TCB_UNLOCK(stcb);
 4588                         }
 4589                         return (NULL);
 4590                 }
 4591         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
 4592                 /*
 4593                  * If there is no stcb, skip the AUTH chunk and process
 4594                  * later after a stcb is found (to validate the lookup was
 4595                  * valid.
 4596                  */
 4597                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
 4598                     (stcb == NULL) &&
 4599                     (inp->auth_supported == 1)) {
 4600                         /* save this chunk for later processing */
 4601                         auth_skipped = 1;
 4602                         auth_offset = *offset;
 4603                         auth_len = ntohs(ch->chunk_length);
 4604 
 4605                         /* (temporarily) move past this chunk */
 4606                         *offset += SCTP_SIZE32(auth_len);
 4607                         if (*offset >= length) {
 4608                                 /* no more data left in the mbuf chain */
 4609                                 *offset = length;
 4610                                 return (NULL);
 4611                         }
 4612                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4613                             sizeof(struct sctp_chunkhdr), chunk_buf);
 4614                 }
 4615                 if (ch == NULL) {
 4616                         /* Help */
 4617                         *offset = length;
 4618                         return (stcb);
 4619                 }
 4620                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
 4621                         goto process_control_chunks;
 4622                 }
 4623                 /*
 4624                  * first check if it's an ASCONF with an unknown src addr we
 4625                  * need to look inside to find the association
 4626                  */
 4627                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
 4628                         struct sctp_chunkhdr *asconf_ch = ch;
 4629                         uint32_t asconf_offset = 0, asconf_len = 0;
 4630 
 4631                         /* inp's refcount may be reduced */
 4632                         SCTP_INP_INCR_REF(inp);
 4633 
 4634                         asconf_offset = *offset;
 4635                         do {
 4636                                 asconf_len = ntohs(asconf_ch->chunk_length);
 4637                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
 4638                                         break;
 4639                                 stcb = sctp_findassociation_ep_asconf(m,
 4640                                     *offset,
 4641                                     dst,
 4642                                     sh, &inp, netp, vrf_id);
 4643                                 if (stcb != NULL)
 4644                                         break;
 4645                                 asconf_offset += SCTP_SIZE32(asconf_len);
 4646                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
 4647                                     sizeof(struct sctp_chunkhdr), chunk_buf);
 4648                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
 4649                         if (stcb == NULL) {
 4650                                 /*
 4651                                  * reduce inp's refcount if not reduced in
 4652                                  * sctp_findassociation_ep_asconf().
 4653                                  */
 4654                                 SCTP_INP_DECR_REF(inp);
 4655                         }
 4656                         /* now go back and verify any auth chunk to be sure */
 4657                         if (auth_skipped && (stcb != NULL)) {
 4658                                 struct sctp_auth_chunk *auth;
 4659 
 4660                                 auth = (struct sctp_auth_chunk *)
 4661                                     sctp_m_getptr(m, auth_offset,
 4662                                     auth_len, chunk_buf);
 4663                                 got_auth = 1;
 4664                                 auth_skipped = 0;
 4665                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
 4666                                     auth_offset)) {
 4667                                         /* auth HMAC failed so dump it */
 4668                                         *offset = length;
 4669                                         return (stcb);
 4670                                 } else {
 4671                                         /* remaining chunks are HMAC checked */
 4672                                         stcb->asoc.authenticated = 1;
 4673                                 }
 4674                         }
 4675                 }
 4676                 if (stcb == NULL) {
 4677                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 4678                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 4679                             msg);
 4680                         /* no association, so it's out of the blue... */
 4681                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
 4682                             mflowtype, mflowid, inp->fibnum,
 4683                             vrf_id, port);
 4684                         *offset = length;
 4685                         return (NULL);
 4686                 }
 4687                 asoc = &stcb->asoc;
 4688                 /* ABORT and SHUTDOWN can use either v_tag... */
 4689                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
 4690                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
 4691                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
 4692                         /* Take the T-bit always into account. */
 4693                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
 4694                             (vtag_in == asoc->my_vtag)) ||
 4695                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
 4696                             (asoc->peer_vtag != htonl(0)) &&
 4697                             (vtag_in == asoc->peer_vtag))) {
 4698                                 /* this is valid */
 4699                         } else {
 4700                                 /* drop this packet... */
 4701                                 SCTP_STAT_INCR(sctps_badvtag);
 4702                                 if (stcb != NULL) {
 4703                                         SCTP_TCB_UNLOCK(stcb);
 4704                                 }
 4705                                 return (NULL);
 4706                         }
 4707                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 4708                         if (vtag_in != asoc->my_vtag) {
 4709                                 /*
 4710                                  * this could be a stale SHUTDOWN-ACK or the
 4711                                  * peer never got the SHUTDOWN-COMPLETE and
 4712                                  * is still hung; we have started a new asoc
 4713                                  * but it won't complete until the shutdown
 4714                                  * is completed
 4715                                  */
 4716                                 if (stcb != NULL) {
 4717                                         SCTP_TCB_UNLOCK(stcb);
 4718                                 }
 4719                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 4720                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 4721                                     msg);
 4722                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
 4723                                     sh, inp, op_err,
 4724                                     mflowtype, mflowid, fibnum,
 4725                                     vrf_id, port);
 4726                                 return (NULL);
 4727                         }
 4728                 } else {
 4729                         /* for all other chunks, vtag must match */
 4730                         if (vtag_in != asoc->my_vtag) {
 4731                                 /* invalid vtag... */
 4732                                 SCTPDBG(SCTP_DEBUG_INPUT3,
 4733                                     "invalid vtag: %xh, expect %xh\n",
 4734                                     vtag_in, asoc->my_vtag);
 4735                                 SCTP_STAT_INCR(sctps_badvtag);
 4736                                 if (stcb != NULL) {
 4737                                         SCTP_TCB_UNLOCK(stcb);
 4738                                 }
 4739                                 *offset = length;
 4740                                 return (NULL);
 4741                         }
 4742                 }
 4743         }                       /* end if !SCTP_COOKIE_ECHO */
 4744         /*
 4745          * process all control chunks...
 4746          */
 4747         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
 4748             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
 4749             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
 4750             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 4751                 /* implied cookie-ack.. we must have lost the ack */
 4752                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
 4753                     *netp);
 4754         }
 4755 process_control_chunks:
 4756         while (IS_SCTP_CONTROL(ch)) {
 4757                 /* validate chunk length */
 4758                 chk_length = ntohs(ch->chunk_length);
 4759                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
 4760                     ch->chunk_type, chk_length);
 4761                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
 4762                 if (chk_length < sizeof(*ch) ||
 4763                     (*offset + (int)chk_length) > length) {
 4764                         *offset = length;
 4765                         return (stcb);
 4766                 }
 4767                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
 4768                 /*
 4769                  * INIT and INIT-ACK only gets the init ack "header" portion
 4770                  * only because we don't have to process the peer's COOKIE.
 4771                  * All others get a complete chunk.
 4772                  */
 4773                 switch (ch->chunk_type) {
 4774                 case SCTP_INITIATION:
 4775                         contiguous = sizeof(struct sctp_init_chunk);
 4776                         break;
 4777                 case SCTP_INITIATION_ACK:
 4778                         contiguous = sizeof(struct sctp_init_ack_chunk);
 4779                         break;
 4780                 default:
 4781                         contiguous = min(chk_length, sizeof(chunk_buf));
 4782                         break;
 4783                 }
 4784                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 4785                     contiguous,
 4786                     chunk_buf);
 4787                 if (ch == NULL) {
 4788                         *offset = length;
 4789                         if (stcb != NULL) {
 4790                                 SCTP_TCB_UNLOCK(stcb);
 4791                         }
 4792                         return (NULL);
 4793                 }
 4794                 num_chunks++;
 4795                 /* Save off the last place we got a control from */
 4796                 if (stcb != NULL) {
 4797                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
 4798                                 /*
 4799                                  * allow last_control to be NULL if
 4800                                  * ASCONF... ASCONF processing will find the
 4801                                  * right net later
 4802                                  */
 4803                                 if ((netp != NULL) && (*netp != NULL))
 4804                                         stcb->asoc.last_control_chunk_from = *netp;
 4805                         }
 4806                 }
 4807 #ifdef SCTP_AUDITING_ENABLED
 4808                 sctp_audit_log(0xB0, ch->chunk_type);
 4809 #endif
 4810 
 4811                 /* check to see if this chunk required auth, but isn't */
 4812                 if ((stcb != NULL) &&
 4813                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
 4814                     !stcb->asoc.authenticated) {
 4815                         /* "silently" ignore */
 4816                         SCTP_STAT_INCR(sctps_recvauthmissing);
 4817                         goto next_chunk;
 4818                 }
 4819                 switch (ch->chunk_type) {
 4820                 case SCTP_INITIATION:
 4821                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
 4822                         /* The INIT chunk must be the only chunk. */
 4823                         if ((num_chunks > 1) ||
 4824                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 4825                                 /* RFC 4960 requires that no ABORT is sent */
 4826                                 *offset = length;
 4827                                 if (stcb != NULL) {
 4828                                         SCTP_TCB_UNLOCK(stcb);
 4829                                 }
 4830                                 return (NULL);
 4831                         }
 4832                         /* Honor our resource limit. */
 4833                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
 4834                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 4835                                 sctp_abort_association(inp, stcb, m, iphlen,
 4836                                     src, dst, sh, op_err,
 4837                                     mflowtype, mflowid,
 4838                                     vrf_id, port);
 4839                                 *offset = length;
 4840                                 return (NULL);
 4841                         }
 4842                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
 4843                             (struct sctp_init_chunk *)ch, inp,
 4844                             stcb, *netp, &abort_no_unlock,
 4845                             mflowtype, mflowid,
 4846                             vrf_id, port);
 4847                         *offset = length;
 4848                         if ((!abort_no_unlock) && (stcb != NULL)) {
 4849                                 SCTP_TCB_UNLOCK(stcb);
 4850                         }
 4851                         return (NULL);
 4852                         break;
 4853                 case SCTP_PAD_CHUNK:
 4854                         break;
 4855                 case SCTP_INITIATION_ACK:
 4856                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
 4857                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 4858                                 /* We are not interested anymore */
 4859                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
 4860                                         ;
 4861                                 } else {
 4862                                         *offset = length;
 4863                                         if (stcb != NULL) {
 4864 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4865                                                 so = SCTP_INP_SO(inp);
 4866                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4867                                                 SCTP_TCB_UNLOCK(stcb);
 4868                                                 SCTP_SOCKET_LOCK(so, 1);
 4869                                                 SCTP_TCB_LOCK(stcb);
 4870                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4871 #endif
 4872                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 4873                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
 4874 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4875                                                 SCTP_SOCKET_UNLOCK(so, 1);
 4876 #endif
 4877                                         }
 4878                                         return (NULL);
 4879                                 }
 4880                         }
 4881                         /* The INIT-ACK chunk must be the only chunk. */
 4882                         if ((num_chunks > 1) ||
 4883                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 4884                                 *offset = length;
 4885                                 return (stcb);
 4886                         }
 4887                         if ((netp != NULL) && (*netp != NULL)) {
 4888                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
 4889                                     src, dst, sh,
 4890                                     (struct sctp_init_ack_chunk *)ch,
 4891                                     stcb, *netp,
 4892                                     &abort_no_unlock,
 4893                                     mflowtype, mflowid,
 4894                                     vrf_id);
 4895                         } else {
 4896                                 ret = -1;
 4897                         }
 4898                         *offset = length;
 4899                         if (abort_no_unlock) {
 4900                                 return (NULL);
 4901                         }
 4902                         /*
 4903                          * Special case, I must call the output routine to
 4904                          * get the cookie echoed
 4905                          */
 4906                         if ((stcb != NULL) && (ret == 0)) {
 4907                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 4908                         }
 4909                         return (stcb);
 4910                         break;
 4911                 case SCTP_SELECTIVE_ACK:
 4912                 case SCTP_NR_SELECTIVE_ACK:
 4913                         {
 4914                                 int abort_now = 0;
 4915                                 uint32_t a_rwnd, cum_ack;
 4916                                 uint16_t num_seg, num_nr_seg, num_dup;
 4917                                 uint8_t flags;
 4918                                 int offset_seg, offset_dup;
 4919 
 4920                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
 4921                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
 4922                                 SCTP_STAT_INCR(sctps_recvsacks);
 4923                                 if (stcb == NULL) {
 4924                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
 4925                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
 4926                                         break;
 4927                                 }
 4928                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
 4929                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
 4930                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
 4931                                                 break;
 4932                                         }
 4933                                 } else {
 4934                                         if (stcb->asoc.nrsack_supported == 0) {
 4935                                                 goto unknown_chunk;
 4936                                         }
 4937                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
 4938                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
 4939                                                 break;
 4940                                         }
 4941                                 }
 4942                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 4943                                         /*-
 4944                                          * If we have sent a shutdown-ack, we will pay no
 4945                                          * attention to a sack sent in to us since
 4946                                          * we don't care anymore.
 4947                                          */
 4948                                         break;
 4949                                 }
 4950                                 flags = ch->chunk_flags;
 4951                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
 4952                                         struct sctp_sack_chunk *sack;
 4953 
 4954                                         sack = (struct sctp_sack_chunk *)ch;
 4955                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
 4956                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
 4957                                         num_nr_seg = 0;
 4958                                         num_dup = ntohs(sack->sack.num_dup_tsns);
 4959                                         a_rwnd = ntohl(sack->sack.a_rwnd);
 4960                                         if (sizeof(struct sctp_sack_chunk) +
 4961                                             num_seg * sizeof(struct sctp_gap_ack_block) +
 4962                                             num_dup * sizeof(uint32_t) != chk_length) {
 4963                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
 4964                                                 break;
 4965                                         }
 4966                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
 4967                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
 4968                                 } else {
 4969                                         struct sctp_nr_sack_chunk *nr_sack;
 4970 
 4971                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
 4972                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
 4973                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
 4974                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
 4975                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
 4976                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
 4977                                         if (sizeof(struct sctp_nr_sack_chunk) +
 4978                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
 4979                                             num_dup * sizeof(uint32_t) != chk_length) {
 4980                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
 4981                                                 break;
 4982                                         }
 4983                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
 4984                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
 4985                                 }
 4986                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
 4987                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
 4988                                     cum_ack, num_seg, a_rwnd);
 4989                                 stcb->asoc.seen_a_sack_this_pkt = 1;
 4990                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
 4991                                     (num_seg == 0) && (num_nr_seg == 0) &&
 4992                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
 4993                                     (stcb->asoc.saw_sack_with_frags == 0) &&
 4994                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
 4995                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 4996                                         /*
 4997                                          * We have a SIMPLE sack having no
 4998                                          * prior segments and data on sent
 4999                                          * queue to be acked. Use the faster
 5000                                          * path sack processing. We also
 5001                                          * allow window update sacks with no
 5002                                          * missing segments to go this way
 5003                                          * too.
 5004                                          */
 5005                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
 5006                                             &abort_now, ecne_seen);
 5007                                 } else {
 5008                                         if ((netp != NULL) && (*netp != NULL)) {
 5009                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
 5010                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
 5011                                                     cum_ack, a_rwnd, ecne_seen);
 5012                                         }
 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                                 break;
 5025                         }
 5026                 case SCTP_HEARTBEAT_REQUEST:
 5027                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
 5028                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
 5029                                 SCTP_STAT_INCR(sctps_recvheartbeat);
 5030                                 sctp_send_heartbeat_ack(stcb, m, *offset,
 5031                                     chk_length, *netp);
 5032                         }
 5033                         break;
 5034                 case SCTP_HEARTBEAT_ACK:
 5035                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
 5036                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
 5037                                 /* Its not ours */
 5038                                 *offset = length;
 5039                                 return (stcb);
 5040                         }
 5041                         SCTP_STAT_INCR(sctps_recvheartbeatack);
 5042                         if ((netp != NULL) && (*netp != NULL)) {
 5043                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
 5044                                     stcb, *netp);
 5045                         }
 5046                         break;
 5047                 case SCTP_ABORT_ASSOCIATION:
 5048                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
 5049                             (void *)stcb);
 5050                         *offset = length;
 5051                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
 5052                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
 5053                                         return (NULL);
 5054                                 } else {
 5055                                         return (stcb);
 5056                                 }
 5057                         } else {
 5058                                 return (NULL);
 5059                         }
 5060                         break;
 5061                 case SCTP_SHUTDOWN:
 5062                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
 5063                             (void *)stcb);
 5064                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
 5065                                 *offset = length;
 5066                                 return (stcb);
 5067                         }
 5068                         if ((netp != NULL) && (*netp != NULL)) {
 5069                                 int abort_flag = 0;
 5070 
 5071                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
 5072                                     stcb, *netp, &abort_flag);
 5073                                 if (abort_flag) {
 5074                                         *offset = length;
 5075                                         return (NULL);
 5076                                 }
 5077                         }
 5078                         break;
 5079                 case SCTP_SHUTDOWN_ACK:
 5080                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
 5081                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
 5082                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
 5083                         }
 5084                         *offset = length;
 5085                         return (NULL);
 5086                         break;
 5087                 case SCTP_OPERATION_ERROR:
 5088                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
 5089                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
 5090                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
 5091                                 *offset = length;
 5092                                 return (NULL);
 5093                         }
 5094                         break;
 5095                 case SCTP_COOKIE_ECHO:
 5096                         SCTPDBG(SCTP_DEBUG_INPUT3,
 5097                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
 5098                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
 5099                                 ;
 5100                         } else {
 5101                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5102                                         /* We are not interested anymore */
 5103                         abend:
 5104                                         if (stcb != NULL) {
 5105                                                 SCTP_TCB_UNLOCK(stcb);
 5106                                         }
 5107                                         *offset = length;
 5108                                         return (NULL);
 5109                                 }
 5110                         }
 5111                         /*
 5112                          * First are we accepting? We do this again here
 5113                          * since it is possible that a previous endpoint WAS
 5114                          * listening responded to a INIT-ACK and then
 5115                          * closed. We opened and bound.. and are now no
 5116                          * longer listening.
 5117                          */
 5118 
 5119                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
 5120                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 5121                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
 5122                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 5123                                         sctp_abort_association(inp, stcb, m, iphlen,
 5124                                             src, dst, sh, op_err,
 5125                                             mflowtype, mflowid,
 5126                                             vrf_id, port);
 5127                                 }
 5128                                 *offset = length;
 5129                                 return (NULL);
 5130                         } else {
 5131                                 struct mbuf *ret_buf;
 5132                                 struct sctp_inpcb *linp;
 5133 
 5134                                 if (stcb) {
 5135                                         linp = NULL;
 5136                                 } else {
 5137                                         linp = inp;
 5138                                 }
 5139 
 5140                                 if (linp != NULL) {
 5141                                         SCTP_ASOC_CREATE_LOCK(linp);
 5142                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 5143                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
 5144                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
 5145                                                 goto abend;
 5146                                         }
 5147                                 }
 5148                                 if (netp != NULL) {
 5149                                         struct sctp_tcb *locked_stcb;
 5150 
 5151                                         locked_stcb = stcb;
 5152                                         ret_buf =
 5153                                             sctp_handle_cookie_echo(m, iphlen,
 5154                                             *offset,
 5155                                             src, dst,
 5156                                             sh,
 5157                                             (struct sctp_cookie_echo_chunk *)ch,
 5158                                             &inp, &stcb, netp,
 5159                                             auth_skipped,
 5160                                             auth_offset,
 5161                                             auth_len,
 5162                                             &locked_stcb,
 5163                                             mflowtype,
 5164                                             mflowid,
 5165                                             vrf_id,
 5166                                             port);
 5167                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
 5168                                                 SCTP_TCB_UNLOCK(locked_stcb);
 5169                                         }
 5170                                         if (stcb != NULL) {
 5171                                                 SCTP_TCB_LOCK_ASSERT(stcb);
 5172                                         }
 5173                                 } else {
 5174                                         ret_buf = NULL;
 5175                                 }
 5176                                 if (linp != NULL) {
 5177                                         SCTP_ASOC_CREATE_UNLOCK(linp);
 5178                                 }
 5179                                 if (ret_buf == NULL) {
 5180                                         if (stcb != NULL) {
 5181                                                 SCTP_TCB_UNLOCK(stcb);
 5182                                         }
 5183                                         SCTPDBG(SCTP_DEBUG_INPUT3,
 5184                                             "GAK, null buffer\n");
 5185                                         *offset = length;
 5186                                         return (NULL);
 5187                                 }
 5188                                 /* if AUTH skipped, see if it verified... */
 5189                                 if (auth_skipped) {
 5190                                         got_auth = 1;
 5191                                         auth_skipped = 0;
 5192                                 }
 5193                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
 5194                                         /*
 5195                                          * Restart the timer if we have
 5196                                          * pending data
 5197                                          */
 5198                                         struct sctp_tmit_chunk *chk;
 5199 
 5200                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
 5201                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
 5202                                 }
 5203                         }
 5204                         break;
 5205                 case SCTP_COOKIE_ACK:
 5206                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
 5207                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
 5208                                 return (stcb);
 5209                         }
 5210                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5211                                 /* We are not interested anymore */
 5212                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
 5213                                         ;
 5214                                 } else if (stcb) {
 5215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5216                                         so = SCTP_INP_SO(inp);
 5217                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5218                                         SCTP_TCB_UNLOCK(stcb);
 5219                                         SCTP_SOCKET_LOCK(so, 1);
 5220                                         SCTP_TCB_LOCK(stcb);
 5221                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 5222 #endif
 5223                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 5224                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
 5225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5226                                         SCTP_SOCKET_UNLOCK(so, 1);
 5227 #endif
 5228                                         *offset = length;
 5229                                         return (NULL);
 5230                                 }
 5231                         }
 5232                         if ((netp != NULL) && (*netp != NULL)) {
 5233                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
 5234                         }
 5235                         break;
 5236                 case SCTP_ECN_ECHO:
 5237                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
 5238                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
 5239                                 /* Its not ours */
 5240                                 *offset = length;
 5241                                 return (stcb);
 5242                         }
 5243                         if (stcb->asoc.ecn_supported == 0) {
 5244                                 goto unknown_chunk;
 5245                         }
 5246                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
 5247                         ecne_seen = 1;
 5248                         break;
 5249                 case SCTP_ECN_CWR:
 5250                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
 5251                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
 5252                                 *offset = length;
 5253                                 return (stcb);
 5254                         }
 5255                         if (stcb->asoc.ecn_supported == 0) {
 5256                                 goto unknown_chunk;
 5257                         }
 5258                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
 5259                         break;
 5260                 case SCTP_SHUTDOWN_COMPLETE:
 5261                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
 5262                         /* must be first and only chunk */
 5263                         if ((num_chunks > 1) ||
 5264                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
 5265                                 *offset = length;
 5266                                 return (stcb);
 5267                         }
 5268                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
 5269                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
 5270                                     stcb, *netp);
 5271                         }
 5272                         *offset = length;
 5273                         return (NULL);
 5274                         break;
 5275                 case SCTP_ASCONF:
 5276                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
 5277                         if (stcb != NULL) {
 5278                                 if (stcb->asoc.asconf_supported == 0) {
 5279                                         goto unknown_chunk;
 5280                                 }
 5281                                 sctp_handle_asconf(m, *offset, src,
 5282                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
 5283                                 asconf_cnt++;
 5284                         }
 5285                         break;
 5286                 case SCTP_ASCONF_ACK:
 5287                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
 5288                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
 5289                                 /* Its not ours */
 5290                                 *offset = length;
 5291                                 return (stcb);
 5292                         }
 5293                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
 5294                                 if (stcb->asoc.asconf_supported == 0) {
 5295                                         goto unknown_chunk;
 5296                                 }
 5297                                 /* He's alive so give him credit */
 5298                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 5299                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 5300                                             stcb->asoc.overall_error_count,
 5301                                             0,
 5302                                             SCTP_FROM_SCTP_INPUT,
 5303                                             __LINE__);
 5304                                 }
 5305                                 stcb->asoc.overall_error_count = 0;
 5306                                 sctp_handle_asconf_ack(m, *offset,
 5307                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
 5308                                 if (abort_no_unlock)
 5309                                         return (NULL);
 5310                         }
 5311                         break;
 5312                 case SCTP_FORWARD_CUM_TSN:
 5313                 case SCTP_IFORWARD_CUM_TSN:
 5314                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n");
 5315                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
 5316                                 /* Its not ours */
 5317                                 *offset = length;
 5318                                 return (stcb);
 5319                         }
 5320                         if (stcb != NULL) {
 5321                                 int abort_flag = 0;
 5322 
 5323                                 if (stcb->asoc.prsctp_supported == 0) {
 5324                                         goto unknown_chunk;
 5325                                 }
 5326                                 *fwd_tsn_seen = 1;
 5327                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
 5328                                         /* We are not interested anymore */
 5329 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5330                                         so = SCTP_INP_SO(inp);
 5331                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5332                                         SCTP_TCB_UNLOCK(stcb);
 5333                                         SCTP_SOCKET_LOCK(so, 1);
 5334                                         SCTP_TCB_LOCK(stcb);
 5335                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 5336 #endif
 5337                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 5338                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
 5339 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5340                                         SCTP_SOCKET_UNLOCK(so, 1);
 5341 #endif
 5342                                         *offset = length;
 5343                                         return (NULL);
 5344                                 }
 5345                                 /*
 5346                                  * For sending a SACK this looks like DATA
 5347                                  * chunks.
 5348                                  */
 5349                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
 5350                                 sctp_handle_forward_tsn(stcb,
 5351                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
 5352                                 if (abort_flag) {
 5353                                         *offset = length;
 5354                                         return (NULL);
 5355                                 }
 5356                         }
 5357                         break;
 5358                 case SCTP_STREAM_RESET:
 5359                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
 5360                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
 5361                                 /* Its not ours */
 5362                                 *offset = length;
 5363                                 return (stcb);
 5364                         }
 5365                         if (stcb->asoc.reconfig_supported == 0) {
 5366                                 goto unknown_chunk;
 5367                         }
 5368                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
 5369                                 /* stop processing */
 5370                                 *offset = length;
 5371                                 return (NULL);
 5372                         }
 5373                         break;
 5374                 case SCTP_PACKET_DROPPED:
 5375                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
 5376                         /* re-get it all please */
 5377                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
 5378                                 /* Its not ours */
 5379                                 *offset = length;
 5380                                 return (stcb);
 5381                         }
 5382                         if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
 5383                                 if (stcb->asoc.pktdrop_supported == 0) {
 5384                                         goto unknown_chunk;
 5385                                 }
 5386                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
 5387                                     stcb, *netp,
 5388                                     min(chk_length, contiguous));
 5389                         }
 5390                         break;
 5391                 case SCTP_AUTHENTICATION:
 5392                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
 5393                         if (stcb == NULL) {
 5394                                 /* save the first AUTH for later processing */
 5395                                 if (auth_skipped == 0) {
 5396                                         auth_offset = *offset;
 5397                                         auth_len = chk_length;
 5398                                         auth_skipped = 1;
 5399                                 }
 5400                                 /* skip this chunk (temporarily) */
 5401                                 goto next_chunk;
 5402                         }
 5403                         if (stcb->asoc.auth_supported == 0) {
 5404                                 goto unknown_chunk;
 5405                         }
 5406                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
 5407                             (chk_length > (sizeof(struct sctp_auth_chunk) +
 5408                             SCTP_AUTH_DIGEST_LEN_MAX))) {
 5409                                 /* Its not ours */
 5410                                 *offset = length;
 5411                                 return (stcb);
 5412                         }
 5413                         if (got_auth == 1) {
 5414                                 /* skip this chunk... it's already auth'd */
 5415                                 goto next_chunk;
 5416                         }
 5417                         got_auth = 1;
 5418                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
 5419                             m, *offset)) {
 5420                                 /* auth HMAC failed so dump the packet */
 5421                                 *offset = length;
 5422                                 return (stcb);
 5423                         } else {
 5424                                 /* remaining chunks are HMAC checked */
 5425                                 stcb->asoc.authenticated = 1;
 5426                         }
 5427                         break;
 5428 
 5429                 default:
 5430         unknown_chunk:
 5431                         /* it's an unknown chunk! */
 5432                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
 5433                                 struct sctp_gen_error_cause *cause;
 5434                                 int len;
 5435 
 5436                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
 5437                                     0, M_NOWAIT, 1, MT_DATA);
 5438                                 if (op_err != NULL) {
 5439                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
 5440                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
 5441                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
 5442                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
 5443                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
 5444                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
 5445                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
 5446 #ifdef SCTP_MBUF_LOGGING
 5447                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 5448                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
 5449                                                 }
 5450 #endif
 5451                                                 sctp_queue_op_err(stcb, op_err);
 5452                                         } else {
 5453                                                 sctp_m_freem(op_err);
 5454                                         }
 5455                                 }
 5456                         }
 5457                         if ((ch->chunk_type & 0x80) == 0) {
 5458                                 /* discard this packet */
 5459                                 *offset = length;
 5460                                 return (stcb);
 5461                         }       /* else skip this bad chunk and continue... */
 5462                         break;
 5463                 }               /* switch (ch->chunk_type) */
 5464 
 5465 
 5466 next_chunk:
 5467                 /* get the next chunk */
 5468                 *offset += SCTP_SIZE32(chk_length);
 5469                 if (*offset >= length) {
 5470                         /* no more data left in the mbuf chain */
 5471                         break;
 5472                 }
 5473                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
 5474                     sizeof(struct sctp_chunkhdr), chunk_buf);
 5475                 if (ch == NULL) {
 5476                         *offset = length;
 5477                         return (stcb);
 5478                 }
 5479         }                       /* while */
 5480 
 5481         if ((asconf_cnt > 0) && (stcb != NULL)) {
 5482                 sctp_send_asconf_ack(stcb);
 5483         }
 5484         return (stcb);
 5485 }
 5486 
 5487 
 5488 /*
 5489  * common input chunk processing (v4 and v6)
 5490  */
 5491 void
 5492 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
 5493     struct sockaddr *src, struct sockaddr *dst,
 5494     struct sctphdr *sh, struct sctp_chunkhdr *ch,
 5495     uint8_t compute_crc,
 5496     uint8_t ecn_bits,
 5497     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
 5498     uint32_t vrf_id, uint16_t port)
 5499 {
 5500         uint32_t high_tsn;
 5501         int fwd_tsn_seen = 0, data_processed = 0;
 5502         struct mbuf *m = *mm, *op_err;
 5503         char msg[SCTP_DIAG_INFO_LEN];
 5504         int un_sent;
 5505         int cnt_ctrl_ready = 0;
 5506         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
 5507         struct sctp_tcb *stcb = NULL;
 5508         struct sctp_nets *net = NULL;
 5509 
 5510         SCTP_STAT_INCR(sctps_recvdatagrams);
 5511 #ifdef SCTP_AUDITING_ENABLED
 5512         sctp_audit_log(0xE0, 1);
 5513         sctp_auditing(0, inp, stcb, net);
 5514 #endif
 5515         if (compute_crc != 0) {
 5516                 uint32_t check, calc_check;
 5517 
 5518                 check = sh->checksum;
 5519                 sh->checksum = 0;
 5520                 calc_check = sctp_calculate_cksum(m, iphlen);
 5521                 sh->checksum = check;
 5522                 if (calc_check != check) {
 5523                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
 5524                             calc_check, check, (void *)m, length, iphlen);
 5525                         stcb = sctp_findassociation_addr(m, offset, src, dst,
 5526                             sh, ch, &inp, &net, vrf_id);
 5527 #if defined(INET) || defined(INET6)
 5528                         if ((ch->chunk_type != SCTP_INITIATION) &&
 5529                             (net != NULL) && (net->port != port)) {
 5530                                 if (net->port == 0) {
 5531                                         /* UDP encapsulation turned on. */
 5532                                         net->mtu -= sizeof(struct udphdr);
 5533                                         if (stcb->asoc.smallest_mtu > net->mtu) {
 5534                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
 5535                                         }
 5536                                 } else if (port == 0) {
 5537                                         /* UDP encapsulation turned off. */
 5538                                         net->mtu += sizeof(struct udphdr);
 5539                                         /* XXX Update smallest_mtu */
 5540                                 }
 5541                                 net->port = port;
 5542                         }
 5543 #endif
 5544                         if (net != NULL) {
 5545                                 net->flowtype = mflowtype;
 5546                                 net->flowid = mflowid;
 5547                         }
 5548                         if ((inp != NULL) && (stcb != NULL)) {
 5549                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
 5550                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 5551                         } else if ((inp != NULL) && (stcb == NULL)) {
 5552                                 inp_decr = inp;
 5553                         }
 5554                         SCTP_STAT_INCR(sctps_badsum);
 5555                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 5556                         goto out;
 5557                 }
 5558         }
 5559         /* Destination port of 0 is illegal, based on RFC4960. */
 5560         if (sh->dest_port == 0) {
 5561                 SCTP_STAT_INCR(sctps_hdrops);
 5562                 goto out;
 5563         }
 5564         stcb = sctp_findassociation_addr(m, offset, src, dst,
 5565             sh, ch, &inp, &net, vrf_id);
 5566 #if defined(INET) || defined(INET6)
 5567         if ((ch->chunk_type != SCTP_INITIATION) &&
 5568             (net != NULL) && (net->port != port)) {
 5569                 if (net->port == 0) {
 5570                         /* UDP encapsulation turned on. */
 5571                         net->mtu -= sizeof(struct udphdr);
 5572                         if (stcb->asoc.smallest_mtu > net->mtu) {
 5573                                 sctp_pathmtu_adjustment(stcb, net->mtu);
 5574                         }
 5575                 } else if (port == 0) {
 5576                         /* UDP encapsulation turned off. */
 5577                         net->mtu += sizeof(struct udphdr);
 5578                         /* XXX Update smallest_mtu */
 5579                 }
 5580                 net->port = port;
 5581         }
 5582 #endif
 5583         if (net != NULL) {
 5584                 net->flowtype = mflowtype;
 5585                 net->flowid = mflowid;
 5586         }
 5587         if (inp == NULL) {
 5588                 SCTP_STAT_INCR(sctps_noport);
 5589                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
 5590                         goto out;
 5591                 }
 5592                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 5593                         sctp_send_shutdown_complete2(src, dst, sh,
 5594                             mflowtype, mflowid, fibnum,
 5595                             vrf_id, port);
 5596                         goto out;
 5597                 }
 5598                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 5599                         goto out;
 5600                 }
 5601                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
 5602                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
 5603                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
 5604                             (ch->chunk_type != SCTP_INIT))) {
 5605                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5606                                     "Out of the blue");
 5607                                 sctp_send_abort(m, iphlen, src, dst,
 5608                                     sh, 0, op_err,
 5609                                     mflowtype, mflowid, fibnum,
 5610                                     vrf_id, port);
 5611                         }
 5612                 }
 5613                 goto out;
 5614         } else if (stcb == NULL) {
 5615                 inp_decr = inp;
 5616         }
 5617         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
 5618             (void *)m, iphlen, offset, length, (void *)stcb);
 5619         if (stcb) {
 5620                 /* always clear this before beginning a packet */
 5621                 stcb->asoc.authenticated = 0;
 5622                 stcb->asoc.seen_a_sack_this_pkt = 0;
 5623                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
 5624                     (void *)stcb, stcb->asoc.state);
 5625 
 5626                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
 5627                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
 5628                         /*-
 5629                          * If we hit here, we had a ref count
 5630                          * up when the assoc was aborted and the
 5631                          * timer is clearing out the assoc, we should
 5632                          * NOT respond to any packet.. its OOTB.
 5633                          */
 5634                         SCTP_TCB_UNLOCK(stcb);
 5635                         stcb = NULL;
 5636                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 5637                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5638                             msg);
 5639                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
 5640                             mflowtype, mflowid, inp->fibnum,
 5641                             vrf_id, port);
 5642                         goto out;
 5643                 }
 5644         }
 5645         if (IS_SCTP_CONTROL(ch)) {
 5646                 /* process the control portion of the SCTP packet */
 5647                 /* sa_ignore NO_NULL_CHK */
 5648                 stcb = sctp_process_control(m, iphlen, &offset, length,
 5649                     src, dst, sh, ch,
 5650                     inp, stcb, &net, &fwd_tsn_seen,
 5651                     mflowtype, mflowid, fibnum,
 5652                     vrf_id, port);
 5653                 if (stcb) {
 5654                         /*
 5655                          * This covers us if the cookie-echo was there and
 5656                          * it changes our INP.
 5657                          */
 5658                         inp = stcb->sctp_ep;
 5659 #if defined(INET) || defined(INET6)
 5660                         if ((ch->chunk_type != SCTP_INITIATION) &&
 5661                             (net != NULL) && (net->port != port)) {
 5662                                 if (net->port == 0) {
 5663                                         /* UDP encapsulation turned on. */
 5664                                         net->mtu -= sizeof(struct udphdr);
 5665                                         if (stcb->asoc.smallest_mtu > net->mtu) {
 5666                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
 5667                                         }
 5668                                 } else if (port == 0) {
 5669                                         /* UDP encapsulation turned off. */
 5670                                         net->mtu += sizeof(struct udphdr);
 5671                                         /* XXX Update smallest_mtu */
 5672                                 }
 5673                                 net->port = port;
 5674                         }
 5675 #endif
 5676                 }
 5677         } else {
 5678                 /*
 5679                  * no control chunks, so pre-process DATA chunks (these
 5680                  * checks are taken care of by control processing)
 5681                  */
 5682 
 5683                 /*
 5684                  * if DATA only packet, and auth is required, then punt...
 5685                  * can't have authenticated without any AUTH (control)
 5686                  * chunks
 5687                  */
 5688                 if ((stcb != NULL) &&
 5689                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
 5690                         /* "silently" ignore */
 5691                         SCTP_STAT_INCR(sctps_recvauthmissing);
 5692                         goto out;
 5693                 }
 5694                 if (stcb == NULL) {
 5695                         /* out of the blue DATA chunk */
 5696                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 5697                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5698                             msg);
 5699                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
 5700                             mflowtype, mflowid, fibnum,
 5701                             vrf_id, port);
 5702                         goto out;
 5703                 }
 5704                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
 5705                         /* v_tag mismatch! */
 5706                         SCTP_STAT_INCR(sctps_badvtag);
 5707                         goto out;
 5708                 }
 5709         }
 5710 
 5711         if (stcb == NULL) {
 5712                 /*
 5713                  * no valid TCB for this packet, or we found it's a bad
 5714                  * packet while processing control, or we're done with this
 5715                  * packet (done or skip rest of data), so we drop it...
 5716                  */
 5717                 goto out;
 5718         }
 5719         /*
 5720          * DATA chunk processing
 5721          */
 5722         /* plow through the data chunks while length > offset */
 5723 
 5724         /*
 5725          * Rest should be DATA only.  Check authentication state if AUTH for
 5726          * DATA is required.
 5727          */
 5728         if ((length > offset) &&
 5729             (stcb != NULL) &&
 5730             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
 5731             !stcb->asoc.authenticated) {
 5732                 /* "silently" ignore */
 5733                 SCTP_STAT_INCR(sctps_recvauthmissing);
 5734                 SCTPDBG(SCTP_DEBUG_AUTH1,
 5735                     "Data chunk requires AUTH, skipped\n");
 5736                 goto trigger_send;
 5737         }
 5738         if (length > offset) {
 5739                 int retval;
 5740 
 5741                 /*
 5742                  * First check to make sure our state is correct. We would
 5743                  * not get here unless we really did have a tag, so we don't
 5744                  * abort if this happens, just dump the chunk silently.
 5745                  */
 5746                 switch (SCTP_GET_STATE(&stcb->asoc)) {
 5747                 case SCTP_STATE_COOKIE_ECHOED:
 5748                         /*
 5749                          * we consider data with valid tags in this state
 5750                          * shows us the cookie-ack was lost. Imply it was
 5751                          * there.
 5752                          */
 5753                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
 5754                         break;
 5755                 case SCTP_STATE_COOKIE_WAIT:
 5756                         /*
 5757                          * We consider OOTB any data sent during asoc setup.
 5758                          */
 5759                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
 5760                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5761                             msg);
 5762                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
 5763                             mflowtype, mflowid, inp->fibnum,
 5764                             vrf_id, port);
 5765                         goto out;
 5766                         /* sa_ignore NOTREACHED */
 5767                         break;
 5768                 case SCTP_STATE_EMPTY:  /* should not happen */
 5769                 case SCTP_STATE_INUSE:  /* should not happen */
 5770                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
 5771                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
 5772                 default:
 5773                         goto out;
 5774                         /* sa_ignore NOTREACHED */
 5775                         break;
 5776                 case SCTP_STATE_OPEN:
 5777                 case SCTP_STATE_SHUTDOWN_SENT:
 5778                         break;
 5779                 }
 5780                 /* plow through the data chunks while length > offset */
 5781                 retval = sctp_process_data(mm, iphlen, &offset, length,
 5782                     inp, stcb, net, &high_tsn);
 5783                 if (retval == 2) {
 5784                         /*
 5785                          * The association aborted, NO UNLOCK needed since
 5786                          * the association is destroyed.
 5787                          */
 5788                         stcb = NULL;
 5789                         goto out;
 5790                 }
 5791                 data_processed = 1;
 5792                 /*
 5793                  * Anything important needs to have been m_copy'ed in
 5794                  * process_data
 5795                  */
 5796         }
 5797         /* take care of ecn */
 5798         if ((data_processed == 1) &&
 5799             (stcb->asoc.ecn_supported == 1) &&
 5800             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
 5801                 /* Yep, we need to add a ECNE */
 5802                 sctp_send_ecn_echo(stcb, net, high_tsn);
 5803         }
 5804         if ((data_processed == 0) && (fwd_tsn_seen)) {
 5805                 int was_a_gap;
 5806                 uint32_t highest_tsn;
 5807 
 5808                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
 5809                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
 5810                 } else {
 5811                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
 5812                 }
 5813                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
 5814                 stcb->asoc.send_sack = 1;
 5815                 sctp_sack_check(stcb, was_a_gap);
 5816         } else if (fwd_tsn_seen) {
 5817                 stcb->asoc.send_sack = 1;
 5818         }
 5819         /* trigger send of any chunks in queue... */
 5820 trigger_send:
 5821 #ifdef SCTP_AUDITING_ENABLED
 5822         sctp_audit_log(0xE0, 2);
 5823         sctp_auditing(1, inp, stcb, net);
 5824 #endif
 5825         SCTPDBG(SCTP_DEBUG_INPUT1,
 5826             "Check for chunk output prw:%d tqe:%d tf=%d\n",
 5827             stcb->asoc.peers_rwnd,
 5828             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
 5829             stcb->asoc.total_flight);
 5830         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
 5831         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
 5832                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
 5833         }
 5834         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
 5835             cnt_ctrl_ready ||
 5836             stcb->asoc.trigger_reset ||
 5837             ((un_sent) &&
 5838             (stcb->asoc.peers_rwnd > 0 ||
 5839             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
 5840                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
 5841                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 5842                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
 5843         }
 5844 #ifdef SCTP_AUDITING_ENABLED
 5845         sctp_audit_log(0xE0, 3);
 5846         sctp_auditing(2, inp, stcb, net);
 5847 #endif
 5848 out:
 5849         if (stcb != NULL) {
 5850                 SCTP_TCB_UNLOCK(stcb);
 5851         }
 5852         if (inp_decr != NULL) {
 5853                 /* reduce ref-count */
 5854                 SCTP_INP_WLOCK(inp_decr);
 5855                 SCTP_INP_DECR_REF(inp_decr);
 5856                 SCTP_INP_WUNLOCK(inp_decr);
 5857         }
 5858         return;
 5859 }
 5860 
 5861 #ifdef INET
 5862 void
 5863 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
 5864 {
 5865         struct mbuf *m;
 5866         int iphlen;
 5867         uint32_t vrf_id = 0;
 5868         uint8_t ecn_bits;
 5869         struct sockaddr_in src, dst;
 5870         struct ip *ip;
 5871         struct sctphdr *sh;
 5872         struct sctp_chunkhdr *ch;
 5873         int length, offset;
 5874         uint8_t compute_crc;
 5875         uint32_t mflowid;
 5876         uint8_t mflowtype;
 5877         uint16_t fibnum;
 5878 
 5879         iphlen = off;
 5880         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
 5881                 SCTP_RELEASE_PKT(i_pak);
 5882                 return;
 5883         }
 5884         m = SCTP_HEADER_TO_CHAIN(i_pak);
 5885 #ifdef SCTP_MBUF_LOGGING
 5886         /* Log in any input mbufs */
 5887         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 5888                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
 5889         }
 5890 #endif
 5891 #ifdef SCTP_PACKET_LOGGING
 5892         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 5893                 sctp_packet_log(m);
 5894         }
 5895 #endif
 5896         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 5897             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 5898             m->m_pkthdr.len,
 5899             if_name(m->m_pkthdr.rcvif),
 5900             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 5901         mflowid = m->m_pkthdr.flowid;
 5902         mflowtype = M_HASHTYPE_GET(m);
 5903         fibnum = M_GETFIB(m);
 5904         SCTP_STAT_INCR(sctps_recvpackets);
 5905         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 5906         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 5907         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 5908         if (SCTP_BUF_LEN(m) < offset) {
 5909                 if ((m = m_pullup(m, offset)) == NULL) {
 5910                         SCTP_STAT_INCR(sctps_hdrops);
 5911                         return;
 5912                 }
 5913         }
 5914         ip = mtod(m, struct ip *);
 5915         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
 5916         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 5917         offset -= sizeof(struct sctp_chunkhdr);
 5918         memset(&src, 0, sizeof(struct sockaddr_in));
 5919         src.sin_family = AF_INET;
 5920         src.sin_len = sizeof(struct sockaddr_in);
 5921         src.sin_port = sh->src_port;
 5922         src.sin_addr = ip->ip_src;
 5923         memset(&dst, 0, sizeof(struct sockaddr_in));
 5924         dst.sin_family = AF_INET;
 5925         dst.sin_len = sizeof(struct sockaddr_in);
 5926         dst.sin_port = sh->dest_port;
 5927         dst.sin_addr = ip->ip_dst;
 5928         length = ntohs(ip->ip_len);
 5929         /* Validate mbuf chain length with IP payload length. */
 5930         if (SCTP_HEADER_LEN(m) != length) {
 5931                 SCTPDBG(SCTP_DEBUG_INPUT1,
 5932                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 5933                 SCTP_STAT_INCR(sctps_hdrops);
 5934                 goto out;
 5935         }
 5936         /* SCTP does not allow broadcasts or multicasts */
 5937         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
 5938                 goto out;
 5939         }
 5940         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
 5941                 goto out;
 5942         }
 5943         ecn_bits = ip->ip_tos;
 5944         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 5945                 SCTP_STAT_INCR(sctps_recvhwcrc);
 5946                 compute_crc = 0;
 5947         } else {
 5948                 SCTP_STAT_INCR(sctps_recvswcrc);
 5949                 compute_crc = 1;
 5950         }
 5951         sctp_common_input_processing(&m, iphlen, offset, length,
 5952             (struct sockaddr *)&src,
 5953             (struct sockaddr *)&dst,
 5954             sh, ch,
 5955             compute_crc,
 5956             ecn_bits,
 5957             mflowtype, mflowid, fibnum,
 5958             vrf_id, port);
 5959 out:
 5960         if (m) {
 5961                 sctp_m_freem(m);
 5962         }
 5963         return;
 5964 }
 5965 
 5966 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
 5967 extern int *sctp_cpuarry;
 5968 #endif
 5969 
 5970 int
 5971 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
 5972 {
 5973         struct mbuf *m;
 5974         int off;
 5975 
 5976         m = *mp;
 5977         off = *offp;
 5978 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
 5979         if (mp_ncpus > 1) {
 5980                 struct ip *ip;
 5981                 struct sctphdr *sh;
 5982                 int offset;
 5983                 int cpu_to_use;
 5984                 uint32_t flowid, tag;
 5985 
 5986                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
 5987                         flowid = m->m_pkthdr.flowid;
 5988                 } else {
 5989                         /*
 5990                          * No flow id built by lower layers fix it so we
 5991                          * create one.
 5992                          */
 5993                         offset = off + sizeof(struct sctphdr);
 5994                         if (SCTP_BUF_LEN(m) < offset) {
 5995                                 if ((m = m_pullup(m, offset)) == NULL) {
 5996                                         SCTP_STAT_INCR(sctps_hdrops);
 5997                                         return (IPPROTO_DONE);
 5998                                 }
 5999                         }
 6000                         ip = mtod(m, struct ip *);
 6001                         sh = (struct sctphdr *)((caddr_t)ip + off);
 6002                         tag = htonl(sh->v_tag);
 6003                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
 6004                         m->m_pkthdr.flowid = flowid;
 6005                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
 6006                 }
 6007                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
 6008                 sctp_queue_to_mcore(m, off, cpu_to_use);
 6009                 return (IPPROTO_DONE);
 6010         }
 6011 #endif
 6012         sctp_input_with_port(m, off, 0);
 6013         return (IPPROTO_DONE);
 6014 }
 6015 #endif

Cache object: 68243a848f8b725e8e9c801192ada81a


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.