sctp_timer.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/10.2/sys/netinet/sctp_timer.c 283822 2015-05-31 12:46:40Z tuexen $");
   35 
   36 #define _IP_VHL
   37 #include <netinet/sctp_os.h>
   38 #include <netinet/sctp_pcb.h>
   39 #ifdef INET6
   40 #endif
   41 #include <netinet/sctp_var.h>
   42 #include <netinet/sctp_sysctl.h>
   43 #include <netinet/sctp_timer.h>
   44 #include <netinet/sctputil.h>
   45 #include <netinet/sctp_output.h>
   46 #include <netinet/sctp_header.h>
   47 #include <netinet/sctp_indata.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctp_input.h>
   50 #include <netinet/sctp.h>
   51 #include <netinet/sctp_uio.h>
   52 #if defined(INET) || defined(INET6)
   53 #include <netinet/udp.h>
   54 #endif
   55 
   56 
   57 void
   58 sctp_audit_retranmission_queue(struct sctp_association *asoc)
   59 {
   60         struct sctp_tmit_chunk *chk;
   61 
   62         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
   63             asoc->sent_queue_retran_cnt,
   64             asoc->sent_queue_cnt);
   65         asoc->sent_queue_retran_cnt = 0;
   66         asoc->sent_queue_cnt = 0;
   67         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
   68                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   69                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   70                 }
   71                 asoc->sent_queue_cnt++;
   72         }
   73         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
   74                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   75                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   76                 }
   77         }
   78         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
   79                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   80                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   81                 }
   82         }
   83         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
   84             asoc->sent_queue_retran_cnt,
   85             asoc->sent_queue_cnt);
   86 }
   87 
   88 int
   89 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   90     struct sctp_nets *net, uint16_t threshold)
   91 {
   92         if (net) {
   93                 net->error_count++;
   94                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
   95                     (void *)net, net->error_count,
   96                     net->failure_threshold);
   97                 if (net->error_count > net->failure_threshold) {
   98                         /* We had a threshold failure */
   99                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
  100                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
  101                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  102                                 net->dest_state &= ~SCTP_ADDR_PF;
  103                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  104                                     stcb, 0,
  105                                     (void *)net, SCTP_SO_NOT_LOCKED);
  106                         }
  107                 } else if ((net->pf_threshold < net->failure_threshold) &&
  108                     (net->error_count > net->pf_threshold)) {
  109                         if (!(net->dest_state & SCTP_ADDR_PF)) {
  110                                 net->dest_state |= SCTP_ADDR_PF;
  111                                 net->last_active = sctp_get_tick_count();
  112                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  113                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
  114                                     stcb->sctp_ep, stcb, net,
  115                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
  116                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
  117                         }
  118                 }
  119         }
  120         if (stcb == NULL)
  121                 return (0);
  122 
  123         if (net) {
  124                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
  125                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  126                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
  127                                     stcb->asoc.overall_error_count,
  128                                     (stcb->asoc.overall_error_count + 1),
  129                                     SCTP_FROM_SCTP_TIMER,
  130                                     __LINE__);
  131                         }
  132                         stcb->asoc.overall_error_count++;
  133                 }
  134         } else {
  135                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  136                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
  137                             stcb->asoc.overall_error_count,
  138                             (stcb->asoc.overall_error_count + 1),
  139                             SCTP_FROM_SCTP_TIMER,
  140                             __LINE__);
  141                 }
  142                 stcb->asoc.overall_error_count++;
  143         }
  144         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
  145             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
  146             (uint32_t) threshold,
  147             ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
  148         /*
  149          * We specifically do not do >= to give the assoc one more change
  150          * before we fail it.
  151          */
  152         if (stcb->asoc.overall_error_count > threshold) {
  153                 /* Abort notification sends a ULP notify */
  154                 struct mbuf *op_err;
  155 
  156                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
  157                     "Association error counter exceeded");
  158                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
  159                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
  160                 return (1);
  161         }
  162         return (0);
  163 }
  164 
  165 /*
  166  * sctp_find_alternate_net() returns a non-NULL pointer as long
  167  * the argument net is non-NULL.
  168  */
  169 struct sctp_nets *
  170 sctp_find_alternate_net(struct sctp_tcb *stcb,
  171     struct sctp_nets *net,
  172     int mode)
  173 {
  174         /* Find and return an alternate network if possible */
  175         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
  176         int once;
  177 
  178         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
  179         int min_errors = -1;
  180         uint32_t max_cwnd = 0;
  181 
  182         if (stcb->asoc.numnets == 1) {
  183                 /* No others but net */
  184                 return (TAILQ_FIRST(&stcb->asoc.nets));
  185         }
  186         /*
  187          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
  188          * net algorithm. This algorithm chooses the active destination (not
  189          * in PF state) with the largest cwnd value. If all destinations are
  190          * in PF state, unreachable, or unconfirmed, choose the desination
  191          * that is in PF state with the lowest error count. In case of a
  192          * tie, choose the destination that was most recently active.
  193          */
  194         if (mode == 2) {
  195                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  196                         /*
  197                          * JRS 5/14/07 - If the destination is unreachable
  198                          * or unconfirmed, skip it.
  199                          */
  200                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  201                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  202                                 continue;
  203                         }
  204                         /*
  205                          * JRS 5/14/07 -  If the destination is reachable
  206                          * but in PF state, compare the error count of the
  207                          * destination to the minimum error count seen thus
  208                          * far. Store the destination with the lower error
  209                          * count.  If the error counts are equal, store the
  210                          * destination that was most recently active.
  211                          */
  212                         if (mnet->dest_state & SCTP_ADDR_PF) {
  213                                 /*
  214                                  * JRS 5/14/07 - If the destination under
  215                                  * consideration is the current destination,
  216                                  * work as if the error count is one higher.
  217                                  * The actual error count will not be
  218                                  * incremented until later in the t3
  219                                  * handler.
  220                                  */
  221                                 if (mnet == net) {
  222                                         if (min_errors == -1) {
  223                                                 min_errors = mnet->error_count + 1;
  224                                                 min_errors_net = mnet;
  225                                         } else if (mnet->error_count + 1 < min_errors) {
  226                                                 min_errors = mnet->error_count + 1;
  227                                                 min_errors_net = mnet;
  228                                         } else if (mnet->error_count + 1 == min_errors
  229                                             && mnet->last_active > min_errors_net->last_active) {
  230                                                 min_errors_net = mnet;
  231                                                 min_errors = mnet->error_count + 1;
  232                                         }
  233                                         continue;
  234                                 } else {
  235                                         if (min_errors == -1) {
  236                                                 min_errors = mnet->error_count;
  237                                                 min_errors_net = mnet;
  238                                         } else if (mnet->error_count < min_errors) {
  239                                                 min_errors = mnet->error_count;
  240                                                 min_errors_net = mnet;
  241                                         } else if (mnet->error_count == min_errors
  242                                             && mnet->last_active > min_errors_net->last_active) {
  243                                                 min_errors_net = mnet;
  244                                                 min_errors = mnet->error_count;
  245                                         }
  246                                         continue;
  247                                 }
  248                         }
  249                         /*
  250                          * JRS 5/14/07 - If the destination is reachable and
  251                          * not in PF state, compare the cwnd of the
  252                          * destination to the highest cwnd seen thus far.
  253                          * Store the destination with the higher cwnd value.
  254                          * If the cwnd values are equal, randomly choose one
  255                          * of the two destinations.
  256                          */
  257                         if (max_cwnd < mnet->cwnd) {
  258                                 max_cwnd_net = mnet;
  259                                 max_cwnd = mnet->cwnd;
  260                         } else if (max_cwnd == mnet->cwnd) {
  261                                 uint32_t rndval;
  262                                 uint8_t this_random;
  263 
  264                                 if (stcb->asoc.hb_random_idx > 3) {
  265                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  266                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
  267                                         this_random = stcb->asoc.hb_random_values[0];
  268                                         stcb->asoc.hb_random_idx++;
  269                                         stcb->asoc.hb_ect_randombit = 0;
  270                                 } else {
  271                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  272                                         stcb->asoc.hb_random_idx++;
  273                                         stcb->asoc.hb_ect_randombit = 0;
  274                                 }
  275                                 if (this_random % 2 == 1) {
  276                                         max_cwnd_net = mnet;
  277                                         max_cwnd = mnet->cwnd;  /* Useless? */
  278                                 }
  279                         }
  280                 }
  281                 if (max_cwnd_net == NULL) {
  282                         if (min_errors_net == NULL) {
  283                                 return (net);
  284                         }
  285                         return (min_errors_net);
  286                 } else {
  287                         return (max_cwnd_net);
  288                 }
  289         }
  290         /*
  291          * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
  292          * choosing an alternate net.
  293          */ 
  294         else if (mode == 1) {
  295                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  296                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  297                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  298                                 /*
  299                                  * will skip ones that are not-reachable or
  300                                  * unconfirmed
  301                                  */
  302                                 continue;
  303                         }
  304                         if (max_cwnd < mnet->cwnd) {
  305                                 max_cwnd_net = mnet;
  306                                 max_cwnd = mnet->cwnd;
  307                         } else if (max_cwnd == mnet->cwnd) {
  308                                 uint32_t rndval;
  309                                 uint8_t this_random;
  310 
  311                                 if (stcb->asoc.hb_random_idx > 3) {
  312                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  313                                         memcpy(stcb->asoc.hb_random_values, &rndval,
  314                                             sizeof(stcb->asoc.hb_random_values));
  315                                         this_random = stcb->asoc.hb_random_values[0];
  316                                         stcb->asoc.hb_random_idx = 0;
  317                                         stcb->asoc.hb_ect_randombit = 0;
  318                                 } else {
  319                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  320                                         stcb->asoc.hb_random_idx++;
  321                                         stcb->asoc.hb_ect_randombit = 0;
  322                                 }
  323                                 if (this_random % 2) {
  324                                         max_cwnd_net = mnet;
  325                                         max_cwnd = mnet->cwnd;
  326                                 }
  327                         }
  328                 }
  329                 if (max_cwnd_net) {
  330                         return (max_cwnd_net);
  331                 }
  332         }
  333         mnet = net;
  334         once = 0;
  335 
  336         if (mnet == NULL) {
  337                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
  338                 if (mnet == NULL) {
  339                         return (NULL);
  340                 }
  341         }
  342         for (;;) {
  343                 alt = TAILQ_NEXT(mnet, sctp_next);
  344                 if (alt == NULL) {
  345                         once++;
  346                         if (once > 1) {
  347                                 break;
  348                         }
  349                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  350                         if (alt == NULL) {
  351                                 return (NULL);
  352                         }
  353                 }
  354                 if (alt->ro.ro_rt == NULL) {
  355                         if (alt->ro._s_addr) {
  356                                 sctp_free_ifa(alt->ro._s_addr);
  357                                 alt->ro._s_addr = NULL;
  358                         }
  359                         alt->src_addr_selected = 0;
  360                 }
  361                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
  362                     (alt->ro.ro_rt != NULL) &&
  363                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
  364                         /* Found a reachable address */
  365                         break;
  366                 }
  367                 mnet = alt;
  368         }
  369 
  370         if (alt == NULL) {
  371                 /* Case where NO insv network exists (dormant state) */
  372                 /* we rotate destinations */
  373                 once = 0;
  374                 mnet = net;
  375                 for (;;) {
  376                         if (mnet == NULL) {
  377                                 return (TAILQ_FIRST(&stcb->asoc.nets));
  378                         }
  379                         alt = TAILQ_NEXT(mnet, sctp_next);
  380                         if (alt == NULL) {
  381                                 once++;
  382                                 if (once > 1) {
  383                                         break;
  384                                 }
  385                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
  386                                 if (alt == NULL) {
  387                                         break;
  388                                 }
  389                         }
  390                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  391                             (alt != net)) {
  392                                 /* Found an alternate address */
  393                                 break;
  394                         }
  395                         mnet = alt;
  396                 }
  397         }
  398         if (alt == NULL) {
  399                 return (net);
  400         }
  401         return (alt);
  402 }
  403 
  404 static void
  405 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
  406     struct sctp_nets *net,
  407     int win_probe,
  408     int num_marked, int num_abandoned)
  409 {
  410         if (net->RTO == 0) {
  411                 net->RTO = stcb->asoc.minrto;
  412         }
  413         net->RTO <<= 1;
  414         if (net->RTO > stcb->asoc.maxrto) {
  415                 net->RTO = stcb->asoc.maxrto;
  416         }
  417         if ((win_probe == 0) && (num_marked || num_abandoned)) {
  418                 /* We don't apply penalty to window probe scenarios */
  419                 /* JRS - Use the congestion control given in the CC module */
  420                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
  421         }
  422 }
  423 
  424 #ifndef INVARIANTS
  425 static void
  426 sctp_recover_sent_list(struct sctp_tcb *stcb)
  427 {
  428         struct sctp_tmit_chunk *chk, *nchk;
  429         struct sctp_association *asoc;
  430 
  431         asoc = &stcb->asoc;
  432         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  433                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
  434                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
  435                             (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
  436                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
  437                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
  438                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
  439                                 }
  440                         }
  441                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  442                         if (PR_SCTP_ENABLED(chk->flags)) {
  443                                 if (asoc->pr_sctp_cnt != 0)
  444                                         asoc->pr_sctp_cnt--;
  445                         }
  446                         if (chk->data) {
  447                                 /* sa_ignore NO_NULL_CHK */
  448                                 sctp_free_bufspace(stcb, asoc, chk, 1);
  449                                 sctp_m_freem(chk->data);
  450                                 chk->data = NULL;
  451                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
  452                                         asoc->sent_queue_cnt_removeable--;
  453                                 }
  454                         }
  455                         asoc->sent_queue_cnt--;
  456                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  457                 }
  458         }
  459         SCTP_PRINTF("after recover order is as follows\n");
  460         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  461                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
  462         }
  463 }
  464 
  465 #endif
  466 
  467 static int
  468 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
  469     struct sctp_nets *net,
  470     struct sctp_nets *alt,
  471     int window_probe,
  472     int *num_marked,
  473     int *num_abandoned)
  474 {
  475 
  476         /*
  477          * Mark all chunks (well not all) that were sent to *net for
  478          * retransmission. Move them to alt for there destination as well...
  479          * We only mark chunks that have been outstanding long enough to
  480          * have received feed-back.
  481          */
  482         struct sctp_tmit_chunk *chk, *nchk;
  483         struct sctp_nets *lnets;
  484         struct timeval now, min_wait, tv;
  485         int cur_rto;
  486         int cnt_abandoned;
  487         int audit_tf, num_mk, fir;
  488         unsigned int cnt_mk;
  489         uint32_t orig_flight, orig_tf;
  490         uint32_t tsnlast, tsnfirst;
  491         int recovery_cnt = 0;
  492 
  493 
  494         /* none in flight now */
  495         audit_tf = 0;
  496         fir = 0;
  497         /*
  498          * figure out how long a data chunk must be pending before we can
  499          * mark it ..
  500          */
  501         (void)SCTP_GETTIME_TIMEVAL(&now);
  502         /* get cur rto in micro-seconds */
  503         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
  504         cur_rto *= 1000;
  505         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  506                 sctp_log_fr(cur_rto,
  507                     stcb->asoc.peers_rwnd,
  508                     window_probe,
  509                     SCTP_FR_T3_MARK_TIME);
  510                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
  511                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
  512         }
  513         tv.tv_sec = cur_rto / 1000000;
  514         tv.tv_usec = cur_rto % 1000000;
  515         min_wait = now;
  516         timevalsub(&min_wait, &tv);
  517         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
  518                 /*
  519                  * if we hit here, we don't have enough seconds on the clock
  520                  * to account for the RTO. We just let the lower seconds be
  521                  * the bounds and don't worry about it. This may mean we
  522                  * will mark a lot more than we should.
  523                  */
  524                 min_wait.tv_sec = min_wait.tv_usec = 0;
  525         }
  526         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  527                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
  528                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
  529         }
  530         /*
  531          * Our rwnd will be incorrect here since we are not adding back the
  532          * cnt * mbuf but we will fix that down below.
  533          */
  534         orig_flight = net->flight_size;
  535         orig_tf = stcb->asoc.total_flight;
  536 
  537         net->fast_retran_ip = 0;
  538         /* Now on to each chunk */
  539         cnt_abandoned = 0;
  540         num_mk = cnt_mk = 0;
  541         tsnfirst = tsnlast = 0;
  542 #ifndef INVARIANTS
  543 start_again:
  544 #endif
  545         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
  546                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
  547                         /* Strange case our list got out of order? */
  548                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
  549                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
  550                         recovery_cnt++;
  551 #ifdef INVARIANTS
  552                         panic("last acked >= chk on sent-Q");
  553 #else
  554                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
  555                         sctp_recover_sent_list(stcb);
  556                         if (recovery_cnt < 10) {
  557                                 goto start_again;
  558                         } else {
  559                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
  560                         }
  561 #endif
  562                 }
  563                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
  564                         /*
  565                          * found one to mark: If it is less than
  566                          * DATAGRAM_ACKED it MUST not be a skipped or marked
  567                          * TSN but instead one that is either already set
  568                          * for retransmission OR one that needs
  569                          * retransmission.
  570                          */
  571 
  572                         /* validate its been outstanding long enough */
  573                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  574                                 sctp_log_fr(chk->rec.data.TSN_seq,
  575                                     chk->sent_rcv_time.tv_sec,
  576                                     chk->sent_rcv_time.tv_usec,
  577                                     SCTP_FR_T3_MARK_TIME);
  578                         }
  579                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
  580                                 /*
  581                                  * we have reached a chunk that was sent
  582                                  * some seconds past our min.. forget it we
  583                                  * will find no more to send.
  584                                  */
  585                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  586                                         sctp_log_fr(0,
  587                                             chk->sent_rcv_time.tv_sec,
  588                                             chk->sent_rcv_time.tv_usec,
  589                                             SCTP_FR_T3_STOPPED);
  590                                 }
  591                                 continue;
  592                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
  593                             (window_probe == 0)) {
  594                                 /*
  595                                  * we must look at the micro seconds to
  596                                  * know.
  597                                  */
  598                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
  599                                         /*
  600                                          * ok it was sent after our boundary
  601                                          * time.
  602                                          */
  603                                         continue;
  604                                 }
  605                         }
  606                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
  607                                 /* Is it expired? */
  608                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
  609                                         /* Yes so drop it */
  610                                         if (chk->data) {
  611                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  612                                                     chk,
  613                                                     1,
  614                                                     SCTP_SO_NOT_LOCKED);
  615                                                 cnt_abandoned++;
  616                                         }
  617                                         continue;
  618                                 }
  619                         }
  620                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
  621                                 /* Has it been retransmitted tv_sec times? */
  622                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
  623                                         if (chk->data) {
  624                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  625                                                     chk,
  626                                                     1,
  627                                                     SCTP_SO_NOT_LOCKED);
  628                                                 cnt_abandoned++;
  629                                         }
  630                                         continue;
  631                                 }
  632                         }
  633                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  634                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  635                                 num_mk++;
  636                                 if (fir == 0) {
  637                                         fir = 1;
  638                                         tsnfirst = chk->rec.data.TSN_seq;
  639                                 }
  640                                 tsnlast = chk->rec.data.TSN_seq;
  641                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  642                                         sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
  643                                             0, SCTP_FR_T3_MARKED);
  644                                 }
  645                                 if (chk->rec.data.chunk_was_revoked) {
  646                                         /* deflate the cwnd */
  647                                         chk->whoTo->cwnd -= chk->book_size;
  648                                         chk->rec.data.chunk_was_revoked = 0;
  649                                 }
  650                                 net->marked_retrans++;
  651                                 stcb->asoc.marked_retrans++;
  652                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  653                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  654                                             chk->whoTo->flight_size,
  655                                             chk->book_size,
  656                                             (uintptr_t) chk->whoTo,
  657                                             chk->rec.data.TSN_seq);
  658                                 }
  659                                 sctp_flight_size_decrease(chk);
  660                                 sctp_total_flight_decrease(stcb, chk);
  661                                 stcb->asoc.peers_rwnd += chk->send_size;
  662                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  663                         }
  664                         chk->sent = SCTP_DATAGRAM_RESEND;
  665                         SCTP_STAT_INCR(sctps_markedretrans);
  666 
  667                         /* reset the TSN for striking and other FR stuff */
  668                         chk->rec.data.doing_fast_retransmit = 0;
  669                         /* Clear any time so NO RTT is being done */
  670 
  671                         if (chk->do_rtt) {
  672                                 if (chk->whoTo->rto_needed == 0) {
  673                                         chk->whoTo->rto_needed = 1;
  674                                 }
  675                         }
  676                         chk->do_rtt = 0;
  677                         if (alt != net) {
  678                                 sctp_free_remote_addr(chk->whoTo);
  679                                 chk->no_fr_allowed = 1;
  680                                 chk->whoTo = alt;
  681                                 atomic_add_int(&alt->ref_count, 1);
  682                         } else {
  683                                 chk->no_fr_allowed = 0;
  684                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  685                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  686                                 } else {
  687                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
  688                                 }
  689                         }
  690                         /*
  691                          * CMT: Do not allow FRs on retransmitted TSNs.
  692                          */
  693                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  694                                 chk->no_fr_allowed = 1;
  695                         }
  696 #ifdef THIS_SHOULD_NOT_BE_DONE
  697                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  698                         /* remember highest acked one */
  699                         could_be_sent = chk;
  700 #endif
  701                 }
  702                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  703                         cnt_mk++;
  704                 }
  705         }
  706         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  707                 /* we did not subtract the same things? */
  708                 audit_tf = 1;
  709         }
  710         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  711                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  712         }
  713 #ifdef SCTP_DEBUG
  714         if (num_mk) {
  715                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  716                     tsnlast);
  717                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
  718                     num_mk, (u_long)stcb->asoc.peers_rwnd);
  719                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  720                     tsnlast);
  721                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
  722                     num_mk,
  723                     (int)stcb->asoc.peers_rwnd);
  724         }
  725 #endif
  726         *num_marked = num_mk;
  727         *num_abandoned = cnt_abandoned;
  728         /*
  729          * Now check for a ECN Echo that may be stranded And include the
  730          * cnt_mk'd to have all resends in the control queue.
  731          */
  732         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  733                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  734                         cnt_mk++;
  735                 }
  736                 if ((chk->whoTo == net) &&
  737                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  738                         sctp_free_remote_addr(chk->whoTo);
  739                         chk->whoTo = alt;
  740                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  741                                 chk->sent = SCTP_DATAGRAM_RESEND;
  742                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  743                                 cnt_mk++;
  744                         }
  745                         atomic_add_int(&alt->ref_count, 1);
  746                 }
  747         }
  748 #ifdef THIS_SHOULD_NOT_BE_DONE
  749         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  750                 /* fix it so we retransmit the highest acked anyway */
  751                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  752                 cnt_mk++;
  753                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  754         }
  755 #endif
  756         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  757 #ifdef INVARIANTS
  758                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  759                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  760 #endif
  761 #ifndef SCTP_AUDITING_ENABLED
  762                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  763 #endif
  764         }
  765         if (audit_tf) {
  766                 SCTPDBG(SCTP_DEBUG_TIMER4,
  767                     "Audit total flight due to negative value net:%p\n",
  768                     (void *)net);
  769                 stcb->asoc.total_flight = 0;
  770                 stcb->asoc.total_flight_count = 0;
  771                 /* Clear all networks flight size */
  772                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  773                         lnets->flight_size = 0;
  774                         SCTPDBG(SCTP_DEBUG_TIMER4,
  775                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  776                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
  777                 }
  778                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  779                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  780                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  781                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  782                                             chk->whoTo->flight_size,
  783                                             chk->book_size,
  784                                             (uintptr_t) chk->whoTo,
  785                                             chk->rec.data.TSN_seq);
  786                                 }
  787                                 sctp_flight_size_increase(chk);
  788                                 sctp_total_flight_increase(stcb, chk);
  789                         }
  790                 }
  791         }
  792         /* We return 1 if we only have a window probe outstanding */
  793         return (0);
  794 }
  795 
  796 
  797 int
  798 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  799     struct sctp_tcb *stcb,
  800     struct sctp_nets *net)
  801 {
  802         struct sctp_nets *alt;
  803         int win_probe, num_mk, num_abandoned;
  804 
  805         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  806                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  807         }
  808         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  809                 struct sctp_nets *lnet;
  810 
  811                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  812                         if (net == lnet) {
  813                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  814                         } else {
  815                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  816                         }
  817                 }
  818         }
  819         /* Find an alternate and mark those for retransmission */
  820         if ((stcb->asoc.peers_rwnd == 0) &&
  821             (stcb->asoc.total_flight < net->mtu)) {
  822                 SCTP_STAT_INCR(sctps_timowindowprobe);
  823                 win_probe = 1;
  824         } else {
  825                 win_probe = 0;
  826         }
  827 
  828         if (win_probe == 0) {
  829                 /* We don't do normal threshold management on window probes */
  830                 if (sctp_threshold_management(inp, stcb, net,
  831                     stcb->asoc.max_send_times)) {
  832                         /* Association was destroyed */
  833                         return (1);
  834                 } else {
  835                         if (net != stcb->asoc.primary_destination) {
  836                                 /* send a immediate HB if our RTO is stale */
  837                                 struct timeval now;
  838                                 unsigned int ms_goneby;
  839 
  840                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  841                                 if (net->last_sent_time.tv_sec) {
  842                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  843                                 } else {
  844                                         ms_goneby = 0;
  845                                 }
  846                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  847                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  848                                                 /*
  849                                                  * no recent feed back in an
  850                                                  * RTO or more, request a
  851                                                  * RTT update
  852                                                  */
  853                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  854                                         }
  855                                 }
  856                         }
  857                 }
  858         } else {
  859                 /*
  860                  * For a window probe we don't penalize the net's but only
  861                  * the association. This may fail it if SACKs are not coming
  862                  * back. If sack's are coming with rwnd locked at 0, we will
  863                  * continue to hold things waiting for rwnd to raise
  864                  */
  865                 if (sctp_threshold_management(inp, stcb, NULL,
  866                     stcb->asoc.max_send_times)) {
  867                         /* Association was destroyed */
  868                         return (1);
  869                 }
  870         }
  871         if (stcb->asoc.sctp_cmt_on_off > 0) {
  872                 if (net->pf_threshold < net->failure_threshold) {
  873                         alt = sctp_find_alternate_net(stcb, net, 2);
  874                 } else {
  875                         /*
  876                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  877                          * being used, then pick dest with largest ssthresh
  878                          * for any retransmission.
  879                          */
  880                         alt = sctp_find_alternate_net(stcb, net, 1);
  881                         /*
  882                          * CUCv2: If a different dest is picked for the
  883                          * retransmission, then new (rtx-)pseudo_cumack
  884                          * needs to be tracked for orig dest. Let CUCv2
  885                          * track new (rtx-) pseudo-cumack always.
  886                          */
  887                         net->find_pseudo_cumack = 1;
  888                         net->find_rtx_pseudo_cumack = 1;
  889                 }
  890         } else {
  891                 alt = sctp_find_alternate_net(stcb, net, 0);
  892         }
  893 
  894         num_mk = 0;
  895         num_abandoned = 0;
  896         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  897             &num_mk, &num_abandoned);
  898         /* FR Loss recovery just ended with the T3. */
  899         stcb->asoc.fast_retran_loss_recovery = 0;
  900 
  901         /* CMT FR loss recovery ended with the T3 */
  902         net->fast_retran_loss_recovery = 0;
  903         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  904             (net->flight_size == 0)) {
  905                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  906         }
  907         /*
  908          * setup the sat loss recovery that prevents satellite cwnd advance.
  909          */
  910         stcb->asoc.sat_t3_loss_recovery = 1;
  911         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  912 
  913         /* Backoff the timer and cwnd */
  914         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  915         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  916             (net->dest_state & SCTP_ADDR_PF)) {
  917                 /* Move all pending over too */
  918                 sctp_move_chunks_from_net(stcb, net);
  919 
  920                 /*
  921                  * Get the address that failed, to force a new src address
  922                  * selecton and a route allocation.
  923                  */
  924                 if (net->ro._s_addr) {
  925                         sctp_free_ifa(net->ro._s_addr);
  926                         net->ro._s_addr = NULL;
  927                 }
  928                 net->src_addr_selected = 0;
  929 
  930                 /* Force a route allocation too */
  931                 if (net->ro.ro_rt) {
  932                         RTFREE(net->ro.ro_rt);
  933                         net->ro.ro_rt = NULL;
  934                 }
  935                 /* Was it our primary? */
  936                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  937                         /*
  938                          * Yes, note it as such and find an alternate note:
  939                          * this means HB code must use this to resent the
  940                          * primary if it goes active AND if someone does a
  941                          * change-primary then this flag must be cleared
  942                          * from any net structures.
  943                          */
  944                         if (stcb->asoc.alternate) {
  945                                 sctp_free_remote_addr(stcb->asoc.alternate);
  946                         }
  947                         stcb->asoc.alternate = alt;
  948                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  949                 }
  950         }
  951         /*
  952          * Special case for cookie-echo'ed case, we don't do output but must
  953          * await the COOKIE-ACK before retransmission
  954          */
  955         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  956                 /*
  957                  * Here we just reset the timer and start again since we
  958                  * have not established the asoc
  959                  */
  960                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  961                 return (0);
  962         }
  963         if (stcb->asoc.prsctp_supported) {
  964                 struct sctp_tmit_chunk *lchk;
  965 
  966                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  967                 /* C3. See if we need to send a Fwd-TSN */
  968                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  969                         send_forward_tsn(stcb, &stcb->asoc);
  970                         if (lchk) {
  971                                 /* Assure a timer is up */
  972                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  973                         }
  974                 }
  975         }
  976         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  977                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  978         }
  979         return (0);
  980 }
  981 
  982 int
  983 sctp_t1init_timer(struct sctp_inpcb *inp,
  984     struct sctp_tcb *stcb,
  985     struct sctp_nets *net)
  986 {
  987         /* bump the thresholds */
  988         if (stcb->asoc.delayed_connection) {
  989                 /*
  990                  * special hook for delayed connection. The library did NOT
  991                  * complete the rest of its sends.
  992                  */
  993                 stcb->asoc.delayed_connection = 0;
  994                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
  995                 return (0);
  996         }
  997         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
  998                 return (0);
  999         }
 1000         if (sctp_threshold_management(inp, stcb, net,
 1001             stcb->asoc.max_init_times)) {
 1002                 /* Association was destroyed */
 1003                 return (1);
 1004         }
 1005         stcb->asoc.dropped_special_cnt = 0;
 1006         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1007         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1008                 net->RTO = stcb->asoc.initial_init_rto_max;
 1009         }
 1010         if (stcb->asoc.numnets > 1) {
 1011                 /* If we have more than one addr use it */
 1012                 struct sctp_nets *alt;
 1013 
 1014                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1015                 if (alt != stcb->asoc.primary_destination) {
 1016                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1017                         stcb->asoc.primary_destination = alt;
 1018                 }
 1019         }
 1020         /* Send out a new init */
 1021         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1022         return (0);
 1023 }
 1024 
 1025 /*
 1026  * For cookie and asconf we actually need to find and mark for resend, then
 1027  * increment the resend counter (after all the threshold management stuff of
 1028  * course).
 1029  */
 1030 int
 1031 sctp_cookie_timer(struct sctp_inpcb *inp,
 1032     struct sctp_tcb *stcb,
 1033     struct sctp_nets *net SCTP_UNUSED)
 1034 {
 1035         struct sctp_nets *alt;
 1036         struct sctp_tmit_chunk *cookie;
 1037 
 1038         /* first before all else we must find the cookie */
 1039         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1040                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1041                         break;
 1042                 }
 1043         }
 1044         if (cookie == NULL) {
 1045                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 1046                         /* FOOBAR! */
 1047                         struct mbuf *op_err;
 1048 
 1049                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
 1050                             "Cookie timer expired, but no cookie");
 1051                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
 1052                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 1053                 } else {
 1054 #ifdef INVARIANTS
 1055                         panic("Cookie timer expires in wrong state?");
 1056 #else
 1057                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
 1058                         return (0);
 1059 #endif
 1060                 }
 1061                 return (0);
 1062         }
 1063         /* Ok we found the cookie, threshold management next */
 1064         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1065             stcb->asoc.max_init_times)) {
 1066                 /* Assoc is over */
 1067                 return (1);
 1068         }
 1069         /*
 1070          * cleared theshold management now lets backoff the address & select
 1071          * an alternate
 1072          */
 1073         stcb->asoc.dropped_special_cnt = 0;
 1074         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1075         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1076         if (alt != cookie->whoTo) {
 1077                 sctp_free_remote_addr(cookie->whoTo);
 1078                 cookie->whoTo = alt;
 1079                 atomic_add_int(&alt->ref_count, 1);
 1080         }
 1081         /* Now mark the retran info */
 1082         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1083                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1084         }
 1085         cookie->sent = SCTP_DATAGRAM_RESEND;
 1086         /*
 1087          * Now call the output routine to kick out the cookie again, Note we
 1088          * don't mark any chunks for retran so that FR will need to kick in
 1089          * to move these (or a send timer).
 1090          */
 1091         return (0);
 1092 }
 1093 
 1094 int
 1095 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1096     struct sctp_nets *net)
 1097 {
 1098         struct sctp_nets *alt;
 1099         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1100 
 1101         if (stcb->asoc.stream_reset_outstanding == 0) {
 1102                 return (0);
 1103         }
 1104         /* find the existing STRRESET, we use the seq number we sent out on */
 1105         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1106         if (strrst == NULL) {
 1107                 return (0);
 1108         }
 1109         /* do threshold management */
 1110         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
 1111             stcb->asoc.max_send_times)) {
 1112                 /* Assoc is over */
 1113                 return (1);
 1114         }
 1115         /*
 1116          * cleared theshold management now lets backoff the address & select
 1117          * an alternate
 1118          */
 1119         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
 1120         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
 1121         sctp_free_remote_addr(strrst->whoTo);
 1122         strrst->whoTo = alt;
 1123         atomic_add_int(&alt->ref_count, 1);
 1124 
 1125         /* See if a ECN Echo is also stranded */
 1126         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1127                 if ((chk->whoTo == net) &&
 1128                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1129                         sctp_free_remote_addr(chk->whoTo);
 1130                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1131                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1132                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1133                         }
 1134                         chk->whoTo = alt;
 1135                         atomic_add_int(&alt->ref_count, 1);
 1136                 }
 1137         }
 1138         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1139                 /*
 1140                  * If the address went un-reachable, we need to move to
 1141                  * alternates for ALL chk's in queue
 1142                  */
 1143                 sctp_move_chunks_from_net(stcb, net);
 1144         }
 1145         /* mark the retran info */
 1146         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1147                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1148         strrst->sent = SCTP_DATAGRAM_RESEND;
 1149 
 1150         /* restart the timer */
 1151         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 1152         return (0);
 1153 }
 1154 
 1155 int
 1156 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1157     struct sctp_nets *net)
 1158 {
 1159         struct sctp_nets *alt;
 1160         struct sctp_tmit_chunk *asconf, *chk;
 1161 
 1162         /* is this a first send, or a retransmission? */
 1163         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1164                 /* compose a new ASCONF chunk and send it */
 1165                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1166         } else {
 1167                 /*
 1168                  * Retransmission of the existing ASCONF is needed
 1169                  */
 1170 
 1171                 /* find the existing ASCONF */
 1172                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1173                 if (asconf == NULL) {
 1174                         return (0);
 1175                 }
 1176                 /* do threshold management */
 1177                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 1178                     stcb->asoc.max_send_times)) {
 1179                         /* Assoc is over */
 1180                         return (1);
 1181                 }
 1182                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1183                         /*
 1184                          * Something is rotten: our peer is not responding
 1185                          * to ASCONFs but apparently is to other chunks.
 1186                          * i.e. it is not properly handling the chunk type
 1187                          * upper bits. Mark this peer as ASCONF incapable
 1188                          * and cleanup.
 1189                          */
 1190                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1191                         sctp_asconf_cleanup(stcb, net);
 1192                         return (0);
 1193                 }
 1194                 /*
 1195                  * cleared threshold management, so now backoff the net and
 1196                  * select an alternate
 1197                  */
 1198                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 1199                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 1200                 if (asconf->whoTo != alt) {
 1201                         sctp_free_remote_addr(asconf->whoTo);
 1202                         asconf->whoTo = alt;
 1203                         atomic_add_int(&alt->ref_count, 1);
 1204                 }
 1205                 /* See if an ECN Echo is also stranded */
 1206                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1207                         if ((chk->whoTo == net) &&
 1208                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1209                                 sctp_free_remote_addr(chk->whoTo);
 1210                                 chk->whoTo = alt;
 1211                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1212                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1213                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1214                                 }
 1215                                 atomic_add_int(&alt->ref_count, 1);
 1216                         }
 1217                 }
 1218                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1219                         if (chk->whoTo != alt) {
 1220                                 sctp_free_remote_addr(chk->whoTo);
 1221                                 chk->whoTo = alt;
 1222                                 atomic_add_int(&alt->ref_count, 1);
 1223                         }
 1224                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1225                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1226                         chk->sent = SCTP_DATAGRAM_RESEND;
 1227                 }
 1228                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1229                         /*
 1230                          * If the address went un-reachable, we need to move
 1231                          * to the alternate for ALL chunks in queue
 1232                          */
 1233                         sctp_move_chunks_from_net(stcb, net);
 1234                 }
 1235                 /* mark the retran info */
 1236                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1237                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1238                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1239 
 1240                 /* send another ASCONF if any and we can do */
 1241                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1242         }
 1243         return (0);
 1244 }
 1245 
 1246 /* Mobility adaptation */
 1247 void
 1248 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1249     struct sctp_nets *net SCTP_UNUSED)
 1250 {
 1251         if (stcb->asoc.deleted_primary == NULL) {
 1252                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1253                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1254                 return;
 1255         }
 1256         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1257         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1258         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1259         stcb->asoc.deleted_primary = NULL;
 1260         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1261         return;
 1262 }
 1263 
 1264 /*
 1265  * For the shutdown and shutdown-ack, we do not keep one around on the
 1266  * control queue. This means we must generate a new one and call the general
 1267  * chunk output routine, AFTER having done threshold management.
 1268  * It is assumed that net is non-NULL.
 1269  */
 1270 int
 1271 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1272     struct sctp_nets *net)
 1273 {
 1274         struct sctp_nets *alt;
 1275 
 1276         /* first threshold managment */
 1277         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1278                 /* Assoc is over */
 1279                 return (1);
 1280         }
 1281         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1282         /* second select an alternative */
 1283         alt = sctp_find_alternate_net(stcb, net, 0);
 1284 
 1285         /* third generate a shutdown into the queue for out net */
 1286         sctp_send_shutdown(stcb, alt);
 1287 
 1288         /* fourth restart timer */
 1289         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1290         return (0);
 1291 }
 1292 
 1293 int
 1294 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1295     struct sctp_nets *net)
 1296 {
 1297         struct sctp_nets *alt;
 1298 
 1299         /* first threshold managment */
 1300         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1301                 /* Assoc is over */
 1302                 return (1);
 1303         }
 1304         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1305         /* second select an alternative */
 1306         alt = sctp_find_alternate_net(stcb, net, 0);
 1307 
 1308         /* third generate a shutdown into the queue for out net */
 1309         sctp_send_shutdown_ack(stcb, alt);
 1310 
 1311         /* fourth restart timer */
 1312         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1313         return (0);
 1314 }
 1315 
 1316 static void
 1317 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1318     struct sctp_tcb *stcb)
 1319 {
 1320         struct sctp_stream_queue_pending *sp;
 1321         unsigned int i, chks_in_queue = 0;
 1322         int being_filled = 0;
 1323 
 1324         /*
 1325          * This function is ONLY called when the send/sent queues are empty.
 1326          */
 1327         if ((stcb == NULL) || (inp == NULL))
 1328                 return;
 1329 
 1330         if (stcb->asoc.sent_queue_retran_cnt) {
 1331                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1332                     stcb->asoc.sent_queue_retran_cnt);
 1333                 stcb->asoc.sent_queue_retran_cnt = 0;
 1334         }
 1335         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1336                 /* No stream scheduler information, initialize scheduler */
 1337                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1338                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1339                         /* yep, we lost a stream or two */
 1340                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1341                 } else {
 1342                         /* no streams lost */
 1343                         stcb->asoc.total_output_queue_size = 0;
 1344                 }
 1345         }
 1346         /* Check to see if some data queued, if so report it */
 1347         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1348                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1349                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1350                                 if (sp->msg_is_complete)
 1351                                         being_filled++;
 1352                                 chks_in_queue++;
 1353                         }
 1354                 }
 1355         }
 1356         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1357                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1358                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1359         }
 1360         if (chks_in_queue) {
 1361                 /* call the output queue function */
 1362                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1363                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1364                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1365                         /*
 1366                          * Probably should go in and make it go back through
 1367                          * and add fragments allowed
 1368                          */
 1369                         if (being_filled == 0) {
 1370                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1371                                     chks_in_queue);
 1372                         }
 1373                 }
 1374         } else {
 1375                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1376                     (u_long)stcb->asoc.total_output_queue_size);
 1377                 stcb->asoc.total_output_queue_size = 0;
 1378         }
 1379 }
 1380 
 1381 int
 1382 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1383     struct sctp_nets *net)
 1384 {
 1385         uint8_t net_was_pf;
 1386 
 1387         if (net->dest_state & SCTP_ADDR_PF) {
 1388                 net_was_pf = 1;
 1389         } else {
 1390                 net_was_pf = 0;
 1391         }
 1392         if (net->hb_responded == 0) {
 1393                 if (net->ro._s_addr) {
 1394                         /*
 1395                          * Invalidate the src address if we did not get a
 1396                          * response last time.
 1397                          */
 1398                         sctp_free_ifa(net->ro._s_addr);
 1399                         net->ro._s_addr = NULL;
 1400                         net->src_addr_selected = 0;
 1401                 }
 1402                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1403                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1404                         /* Assoc is over */
 1405                         return (1);
 1406                 }
 1407         }
 1408         /* Zero PBA, if it needs it */
 1409         if (net->partial_bytes_acked) {
 1410                 net->partial_bytes_acked = 0;
 1411         }
 1412         if ((stcb->asoc.total_output_queue_size > 0) &&
 1413             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1414             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1415                 sctp_audit_stream_queues_for_size(inp, stcb);
 1416         }
 1417         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1418             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1419                 /*
 1420                  * when move to PF during threshold mangement, a HB has been
 1421                  * queued in that routine
 1422                  */
 1423                 uint32_t ms_gone_by;
 1424 
 1425                 if ((net->last_sent_time.tv_sec > 0) ||
 1426                     (net->last_sent_time.tv_usec > 0)) {
 1427                         struct timeval diff;
 1428 
 1429                         SCTP_GETTIME_TIMEVAL(&diff);
 1430                         timevalsub(&diff, &net->last_sent_time);
 1431                         ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
 1432                             (uint32_t) (diff.tv_usec / 1000);
 1433                 } else {
 1434                         ms_gone_by = 0xffffffff;
 1435                 }
 1436                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1437                     (net->dest_state & SCTP_ADDR_PF)) {
 1438                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1439                 }
 1440         }
 1441         return (0);
 1442 }
 1443 
 1444 void
 1445 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1446     struct sctp_tcb *stcb,
 1447     struct sctp_nets *net)
 1448 {
 1449         uint32_t next_mtu, mtu;
 1450 
 1451         next_mtu = sctp_get_next_mtu(net->mtu);
 1452 
 1453         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1454                 if ((net->src_addr_selected == 0) ||
 1455                     (net->ro._s_addr == NULL) ||
 1456                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1457                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1458                                 sctp_free_ifa(net->ro._s_addr);
 1459                                 net->ro._s_addr = NULL;
 1460                                 net->src_addr_selected = 0;
 1461                         } else if (net->ro._s_addr == NULL) {
 1462 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1463                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1464                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1465 
 1466                                         /* KAME hack: embed scopeid */
 1467                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1468                                 }
 1469 #endif
 1470 
 1471                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1472                                     stcb,
 1473                                     (sctp_route_t *) & net->ro,
 1474                                     net, 0, stcb->asoc.vrf_id);
 1475 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1476                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1477                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1478 
 1479                                         (void)sa6_recoverscope(sin6);
 1480                                 }
 1481 #endif                          /* INET6 */
 1482                         }
 1483                         if (net->ro._s_addr)
 1484                                 net->src_addr_selected = 1;
 1485                 }
 1486                 if (net->ro._s_addr) {
 1487                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1488 #if defined(INET) || defined(INET6)
 1489                         if (net->port) {
 1490                                 mtu -= sizeof(struct udphdr);
 1491                         }
 1492 #endif
 1493                         if (mtu > next_mtu) {
 1494                                 net->mtu = next_mtu;
 1495                         }
 1496                 }
 1497         }
 1498         /* restart the timer */
 1499         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1500 }
 1501 
 1502 void
 1503 sctp_autoclose_timer(struct sctp_inpcb *inp,
 1504     struct sctp_tcb *stcb,
 1505     struct sctp_nets *net)
 1506 {
 1507         struct timeval tn, *tim_touse;
 1508         struct sctp_association *asoc;
 1509         int ticks_gone_by;
 1510 
 1511         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1512         if (stcb->asoc.sctp_autoclose_ticks &&
 1513             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1514                 /* Auto close is on */
 1515                 asoc = &stcb->asoc;
 1516                 /* pick the time to use */
 1517                 if (asoc->time_last_rcvd.tv_sec >
 1518                     asoc->time_last_sent.tv_sec) {
 1519                         tim_touse = &asoc->time_last_rcvd;
 1520                 } else {
 1521                         tim_touse = &asoc->time_last_sent;
 1522                 }
 1523                 /* Now has long enough transpired to autoclose? */
 1524                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 1525                 if ((ticks_gone_by > 0) &&
 1526                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
 1527                         /*
 1528                          * autoclose time has hit, call the output routine,
 1529                          * which should do nothing just to be SURE we don't
 1530                          * have hanging data. We can then safely check the
 1531                          * queues and know that we are clear to send
 1532                          * shutdown
 1533                          */
 1534                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1535                         /* Are we clean? */
 1536                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1537                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1538                                 /*
 1539                                  * there is nothing queued to send, so I'm
 1540                                  * done...
 1541                                  */
 1542                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1543                                         /* only send SHUTDOWN 1st time thru */
 1544                                         struct sctp_nets *netp;
 1545 
 1546                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 1547                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1548                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1549                                         }
 1550                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 1551                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 1552                                         sctp_stop_timers_for_shutdown(stcb);
 1553                                         if (stcb->asoc.alternate) {
 1554                                                 netp = stcb->asoc.alternate;
 1555                                         } else {
 1556                                                 netp = stcb->asoc.primary_destination;
 1557                                         }
 1558                                         sctp_send_shutdown(stcb, netp);
 1559                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1560                                             stcb->sctp_ep, stcb,
 1561                                             netp);
 1562                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1563                                             stcb->sctp_ep, stcb,
 1564                                             netp);
 1565                                 }
 1566                         }
 1567                 } else {
 1568                         /*
 1569                          * No auto close at this time, reset t-o to check
 1570                          * later
 1571                          */
 1572                         int tmp;
 1573 
 1574                         /* fool the timer startup to use the time left */
 1575                         tmp = asoc->sctp_autoclose_ticks;
 1576                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1577                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1578                             net);
 1579                         /* restore the real tick value */
 1580                         asoc->sctp_autoclose_ticks = tmp;
 1581                 }
 1582         }
 1583 }
Cache object: e7019e4012be3c7381f032de82fb5a78
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_timer.c

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