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("$FreeBSD$");
   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 #include <netinet/udp.h>
   53 
   54 
   55 void
   56 sctp_audit_retranmission_queue(struct sctp_association *asoc)
   57 {
   58         struct sctp_tmit_chunk *chk;
   59 
   60         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
   61             asoc->sent_queue_retran_cnt,
   62             asoc->sent_queue_cnt);
   63         asoc->sent_queue_retran_cnt = 0;
   64         asoc->sent_queue_cnt = 0;
   65         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
   66                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   67                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   68                 }
   69                 asoc->sent_queue_cnt++;
   70         }
   71         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
   72                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   73                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   74                 }
   75         }
   76         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
   77                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   78                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   79                 }
   80         }
   81         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
   82             asoc->sent_queue_retran_cnt,
   83             asoc->sent_queue_cnt);
   84 }
   85 
   86 int
   87 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   88     struct sctp_nets *net, uint16_t threshold)
   89 {
   90         if (net) {
   91                 net->error_count++;
   92                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
   93                     (void *)net, net->error_count,
   94                     net->failure_threshold);
   95                 if (net->error_count > net->failure_threshold) {
   96                         /* We had a threshold failure */
   97                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
   98                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
   99                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  100                                 net->dest_state &= ~SCTP_ADDR_PF;
  101                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  102                                     stcb, 0,
  103                                     (void *)net, SCTP_SO_NOT_LOCKED);
  104                         }
  105                 } else if ((net->pf_threshold < net->failure_threshold) &&
  106                     (net->error_count > net->pf_threshold)) {
  107                         if (!(net->dest_state & SCTP_ADDR_PF)) {
  108                                 net->dest_state |= SCTP_ADDR_PF;
  109                                 net->last_active = sctp_get_tick_count();
  110                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  111                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
  112                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
  113                         }
  114                 }
  115         }
  116         if (stcb == NULL)
  117                 return (0);
  118 
  119         if (net) {
  120                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
  121                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  122                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
  123                                     stcb->asoc.overall_error_count,
  124                                     (stcb->asoc.overall_error_count + 1),
  125                                     SCTP_FROM_SCTP_TIMER,
  126                                     __LINE__);
  127                         }
  128                         stcb->asoc.overall_error_count++;
  129                 }
  130         } else {
  131                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  132                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
  133                             stcb->asoc.overall_error_count,
  134                             (stcb->asoc.overall_error_count + 1),
  135                             SCTP_FROM_SCTP_TIMER,
  136                             __LINE__);
  137                 }
  138                 stcb->asoc.overall_error_count++;
  139         }
  140         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
  141             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
  142             (uint32_t) threshold,
  143             ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
  144         /*
  145          * We specifically do not do >= to give the assoc one more change
  146          * before we fail it.
  147          */
  148         if (stcb->asoc.overall_error_count > threshold) {
  149                 /* Abort notification sends a ULP notify */
  150                 struct mbuf *op_err;
  151 
  152                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
  153                     "Association error couter exceeded");
  154                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_1;
  155                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
  156                 return (1);
  157         }
  158         return (0);
  159 }
  160 
  161 /*
  162  * sctp_find_alternate_net() returns a non-NULL pointer as long
  163  * the argument net is non-NULL.
  164  */
  165 struct sctp_nets *
  166 sctp_find_alternate_net(struct sctp_tcb *stcb,
  167     struct sctp_nets *net,
  168     int mode)
  169 {
  170         /* Find and return an alternate network if possible */
  171         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
  172         int once;
  173 
  174         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
  175         int min_errors = -1;
  176         uint32_t max_cwnd = 0;
  177 
  178         if (stcb->asoc.numnets == 1) {
  179                 /* No others but net */
  180                 return (TAILQ_FIRST(&stcb->asoc.nets));
  181         }
  182         /*
  183          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
  184          * net algorithm. This algorithm chooses the active destination (not
  185          * in PF state) with the largest cwnd value. If all destinations are
  186          * in PF state, unreachable, or unconfirmed, choose the desination
  187          * that is in PF state with the lowest error count. In case of a
  188          * tie, choose the destination that was most recently active.
  189          */
  190         if (mode == 2) {
  191                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  192                         /*
  193                          * JRS 5/14/07 - If the destination is unreachable
  194                          * or unconfirmed, skip it.
  195                          */
  196                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  197                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  198                                 continue;
  199                         }
  200                         /*
  201                          * JRS 5/14/07 -  If the destination is reachable
  202                          * but in PF state, compare the error count of the
  203                          * destination to the minimum error count seen thus
  204                          * far. Store the destination with the lower error
  205                          * count.  If the error counts are equal, store the
  206                          * destination that was most recently active.
  207                          */
  208                         if (mnet->dest_state & SCTP_ADDR_PF) {
  209                                 /*
  210                                  * JRS 5/14/07 - If the destination under
  211                                  * consideration is the current destination,
  212                                  * work as if the error count is one higher.
  213                                  * The actual error count will not be
  214                                  * incremented until later in the t3
  215                                  * handler.
  216                                  */
  217                                 if (mnet == net) {
  218                                         if (min_errors == -1) {
  219                                                 min_errors = mnet->error_count + 1;
  220                                                 min_errors_net = mnet;
  221                                         } else if (mnet->error_count + 1 < min_errors) {
  222                                                 min_errors = mnet->error_count + 1;
  223                                                 min_errors_net = mnet;
  224                                         } else if (mnet->error_count + 1 == min_errors
  225                                             && mnet->last_active > min_errors_net->last_active) {
  226                                                 min_errors_net = mnet;
  227                                                 min_errors = mnet->error_count + 1;
  228                                         }
  229                                         continue;
  230                                 } else {
  231                                         if (min_errors == -1) {
  232                                                 min_errors = mnet->error_count;
  233                                                 min_errors_net = mnet;
  234                                         } else if (mnet->error_count < min_errors) {
  235                                                 min_errors = mnet->error_count;
  236                                                 min_errors_net = mnet;
  237                                         } else if (mnet->error_count == min_errors
  238                                             && mnet->last_active > min_errors_net->last_active) {
  239                                                 min_errors_net = mnet;
  240                                                 min_errors = mnet->error_count;
  241                                         }
  242                                         continue;
  243                                 }
  244                         }
  245                         /*
  246                          * JRS 5/14/07 - If the destination is reachable and
  247                          * not in PF state, compare the cwnd of the
  248                          * destination to the highest cwnd seen thus far.
  249                          * Store the destination with the higher cwnd value.
  250                          * If the cwnd values are equal, randomly choose one
  251                          * of the two destinations.
  252                          */
  253                         if (max_cwnd < mnet->cwnd) {
  254                                 max_cwnd_net = mnet;
  255                                 max_cwnd = mnet->cwnd;
  256                         } else if (max_cwnd == mnet->cwnd) {
  257                                 uint32_t rndval;
  258                                 uint8_t this_random;
  259 
  260                                 if (stcb->asoc.hb_random_idx > 3) {
  261                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  262                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
  263                                         this_random = stcb->asoc.hb_random_values[0];
  264                                         stcb->asoc.hb_random_idx++;
  265                                         stcb->asoc.hb_ect_randombit = 0;
  266                                 } else {
  267                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  268                                         stcb->asoc.hb_random_idx++;
  269                                         stcb->asoc.hb_ect_randombit = 0;
  270                                 }
  271                                 if (this_random % 2 == 1) {
  272                                         max_cwnd_net = mnet;
  273                                         max_cwnd = mnet->cwnd;  /* Useless? */
  274                                 }
  275                         }
  276                 }
  277                 if (max_cwnd_net == NULL) {
  278                         if (min_errors_net == NULL) {
  279                                 return (net);
  280                         }
  281                         return (min_errors_net);
  282                 } else {
  283                         return (max_cwnd_net);
  284                 }
  285         }
  286         /*
  287          * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
  288          * choosing an alternate net.
  289          */ 
  290         else if (mode == 1) {
  291                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  292                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  293                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  294                                 /*
  295                                  * will skip ones that are not-reachable or
  296                                  * unconfirmed
  297                                  */
  298                                 continue;
  299                         }
  300                         if (max_cwnd < mnet->cwnd) {
  301                                 max_cwnd_net = mnet;
  302                                 max_cwnd = mnet->cwnd;
  303                         } else if (max_cwnd == mnet->cwnd) {
  304                                 uint32_t rndval;
  305                                 uint8_t this_random;
  306 
  307                                 if (stcb->asoc.hb_random_idx > 3) {
  308                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  309                                         memcpy(stcb->asoc.hb_random_values, &rndval,
  310                                             sizeof(stcb->asoc.hb_random_values));
  311                                         this_random = stcb->asoc.hb_random_values[0];
  312                                         stcb->asoc.hb_random_idx = 0;
  313                                         stcb->asoc.hb_ect_randombit = 0;
  314                                 } else {
  315                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  316                                         stcb->asoc.hb_random_idx++;
  317                                         stcb->asoc.hb_ect_randombit = 0;
  318                                 }
  319                                 if (this_random % 2) {
  320                                         max_cwnd_net = mnet;
  321                                         max_cwnd = mnet->cwnd;
  322                                 }
  323                         }
  324                 }
  325                 if (max_cwnd_net) {
  326                         return (max_cwnd_net);
  327                 }
  328         }
  329         mnet = net;
  330         once = 0;
  331 
  332         if (mnet == NULL) {
  333                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
  334                 if (mnet == NULL) {
  335                         return (NULL);
  336                 }
  337         }
  338         do {
  339                 alt = TAILQ_NEXT(mnet, sctp_next);
  340                 if (alt == NULL) {
  341                         once++;
  342                         if (once > 1) {
  343                                 break;
  344                         }
  345                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  346                         if (alt == NULL) {
  347                                 return (NULL);
  348                         }
  349                 }
  350                 if (alt->ro.ro_rt == NULL) {
  351                         if (alt->ro._s_addr) {
  352                                 sctp_free_ifa(alt->ro._s_addr);
  353                                 alt->ro._s_addr = NULL;
  354                         }
  355                         alt->src_addr_selected = 0;
  356                 }
  357                 /* sa_ignore NO_NULL_CHK */
  358                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
  359                     (alt->ro.ro_rt != NULL) &&
  360                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
  361                         /* Found a reachable address */
  362                         break;
  363                 }
  364                 mnet = alt;
  365         } while (alt != NULL);
  366 
  367         if (alt == NULL) {
  368                 /* Case where NO insv network exists (dormant state) */
  369                 /* we rotate destinations */
  370                 once = 0;
  371                 mnet = net;
  372                 do {
  373                         if (mnet == NULL) {
  374                                 return (TAILQ_FIRST(&stcb->asoc.nets));
  375                         }
  376                         alt = TAILQ_NEXT(mnet, sctp_next);
  377                         if (alt == NULL) {
  378                                 once++;
  379                                 if (once > 1) {
  380                                         break;
  381                                 }
  382                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
  383                         }
  384                         /* sa_ignore NO_NULL_CHK */
  385                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  386                             (alt != net)) {
  387                                 /* Found an alternate address */
  388                                 break;
  389                         }
  390                         mnet = alt;
  391                 } while (alt != NULL);
  392         }
  393         if (alt == NULL) {
  394                 return (net);
  395         }
  396         return (alt);
  397 }
  398 
  399 static void
  400 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
  401     struct sctp_nets *net,
  402     int win_probe,
  403     int num_marked, int num_abandoned)
  404 {
  405         if (net->RTO == 0) {
  406                 net->RTO = stcb->asoc.minrto;
  407         }
  408         net->RTO <<= 1;
  409         if (net->RTO > stcb->asoc.maxrto) {
  410                 net->RTO = stcb->asoc.maxrto;
  411         }
  412         if ((win_probe == 0) && (num_marked || num_abandoned)) {
  413                 /* We don't apply penalty to window probe scenarios */
  414                 /* JRS - Use the congestion control given in the CC module */
  415                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
  416         }
  417 }
  418 
  419 #ifndef INVARIANTS
  420 static void
  421 sctp_recover_sent_list(struct sctp_tcb *stcb)
  422 {
  423         struct sctp_tmit_chunk *chk, *nchk;
  424         struct sctp_association *asoc;
  425 
  426         asoc = &stcb->asoc;
  427         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  428                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
  429                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
  430                             (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
  431                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
  432                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
  433                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
  434                                 }
  435                         }
  436                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  437                         if (PR_SCTP_ENABLED(chk->flags)) {
  438                                 if (asoc->pr_sctp_cnt != 0)
  439                                         asoc->pr_sctp_cnt--;
  440                         }
  441                         if (chk->data) {
  442                                 /* sa_ignore NO_NULL_CHK */
  443                                 sctp_free_bufspace(stcb, asoc, chk, 1);
  444                                 sctp_m_freem(chk->data);
  445                                 chk->data = NULL;
  446                                 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(chk->flags)) {
  447                                         asoc->sent_queue_cnt_removeable--;
  448                                 }
  449                         }
  450                         asoc->sent_queue_cnt--;
  451                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  452                 }
  453         }
  454         SCTP_PRINTF("after recover order is as follows\n");
  455         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  456                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
  457         }
  458 }
  459 
  460 #endif
  461 
  462 static int
  463 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
  464     struct sctp_nets *net,
  465     struct sctp_nets *alt,
  466     int window_probe,
  467     int *num_marked,
  468     int *num_abandoned)
  469 {
  470 
  471         /*
  472          * Mark all chunks (well not all) that were sent to *net for
  473          * retransmission. Move them to alt for there destination as well...
  474          * We only mark chunks that have been outstanding long enough to
  475          * have received feed-back.
  476          */
  477         struct sctp_tmit_chunk *chk, *nchk;
  478         struct sctp_nets *lnets;
  479         struct timeval now, min_wait, tv;
  480         int cur_rto;
  481         int cnt_abandoned;
  482         int audit_tf, num_mk, fir;
  483         unsigned int cnt_mk;
  484         uint32_t orig_flight, orig_tf;
  485         uint32_t tsnlast, tsnfirst;
  486         int recovery_cnt = 0;
  487 
  488 
  489         /* none in flight now */
  490         audit_tf = 0;
  491         fir = 0;
  492         /*
  493          * figure out how long a data chunk must be pending before we can
  494          * mark it ..
  495          */
  496         (void)SCTP_GETTIME_TIMEVAL(&now);
  497         /* get cur rto in micro-seconds */
  498         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
  499         cur_rto *= 1000;
  500         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  501                 sctp_log_fr(cur_rto,
  502                     stcb->asoc.peers_rwnd,
  503                     window_probe,
  504                     SCTP_FR_T3_MARK_TIME);
  505                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
  506                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
  507         }
  508         tv.tv_sec = cur_rto / 1000000;
  509         tv.tv_usec = cur_rto % 1000000;
  510         min_wait = now;
  511         timevalsub(&min_wait, &tv);
  512         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
  513                 /*
  514                  * if we hit here, we don't have enough seconds on the clock
  515                  * to account for the RTO. We just let the lower seconds be
  516                  * the bounds and don't worry about it. This may mean we
  517                  * will mark a lot more than we should.
  518                  */
  519                 min_wait.tv_sec = min_wait.tv_usec = 0;
  520         }
  521         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  522                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
  523                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
  524         }
  525         /*
  526          * Our rwnd will be incorrect here since we are not adding back the
  527          * cnt * mbuf but we will fix that down below.
  528          */
  529         orig_flight = net->flight_size;
  530         orig_tf = stcb->asoc.total_flight;
  531 
  532         net->fast_retran_ip = 0;
  533         /* Now on to each chunk */
  534         cnt_abandoned = 0;
  535         num_mk = cnt_mk = 0;
  536         tsnfirst = tsnlast = 0;
  537 #ifndef INVARIANTS
  538 start_again:
  539 #endif
  540         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
  541                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
  542                         /* Strange case our list got out of order? */
  543                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
  544                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
  545                         recovery_cnt++;
  546 #ifdef INVARIANTS
  547                         panic("last acked >= chk on sent-Q");
  548 #else
  549                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
  550                         sctp_recover_sent_list(stcb);
  551                         if (recovery_cnt < 10) {
  552                                 goto start_again;
  553                         } else {
  554                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
  555                         }
  556 #endif
  557                 }
  558                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
  559                         /*
  560                          * found one to mark: If it is less than
  561                          * DATAGRAM_ACKED it MUST not be a skipped or marked
  562                          * TSN but instead one that is either already set
  563                          * for retransmission OR one that needs
  564                          * retransmission.
  565                          */
  566 
  567                         /* validate its been outstanding long enough */
  568                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  569                                 sctp_log_fr(chk->rec.data.TSN_seq,
  570                                     chk->sent_rcv_time.tv_sec,
  571                                     chk->sent_rcv_time.tv_usec,
  572                                     SCTP_FR_T3_MARK_TIME);
  573                         }
  574                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
  575                                 /*
  576                                  * we have reached a chunk that was sent
  577                                  * some seconds past our min.. forget it we
  578                                  * will find no more to send.
  579                                  */
  580                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  581                                         sctp_log_fr(0,
  582                                             chk->sent_rcv_time.tv_sec,
  583                                             chk->sent_rcv_time.tv_usec,
  584                                             SCTP_FR_T3_STOPPED);
  585                                 }
  586                                 continue;
  587                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
  588                             (window_probe == 0)) {
  589                                 /*
  590                                  * we must look at the micro seconds to
  591                                  * know.
  592                                  */
  593                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
  594                                         /*
  595                                          * ok it was sent after our boundary
  596                                          * time.
  597                                          */
  598                                         continue;
  599                                 }
  600                         }
  601                         if (stcb->asoc.peer_supports_prsctp && PR_SCTP_TTL_ENABLED(chk->flags)) {
  602                                 /* Is it expired? */
  603                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
  604                                         /* Yes so drop it */
  605                                         if (chk->data) {
  606                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  607                                                     chk,
  608                                                     1,
  609                                                     SCTP_SO_NOT_LOCKED);
  610                                                 cnt_abandoned++;
  611                                         }
  612                                         continue;
  613                                 }
  614                         }
  615                         if (stcb->asoc.peer_supports_prsctp && PR_SCTP_RTX_ENABLED(chk->flags)) {
  616                                 /* Has it been retransmitted tv_sec times? */
  617                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
  618                                         if (chk->data) {
  619                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  620                                                     chk,
  621                                                     1,
  622                                                     SCTP_SO_NOT_LOCKED);
  623                                                 cnt_abandoned++;
  624                                         }
  625                                         continue;
  626                                 }
  627                         }
  628                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  629                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  630                                 num_mk++;
  631                                 if (fir == 0) {
  632                                         fir = 1;
  633                                         tsnfirst = chk->rec.data.TSN_seq;
  634                                 }
  635                                 tsnlast = chk->rec.data.TSN_seq;
  636                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  637                                         sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
  638                                             0, SCTP_FR_T3_MARKED);
  639                                 }
  640                                 if (chk->rec.data.chunk_was_revoked) {
  641                                         /* deflate the cwnd */
  642                                         chk->whoTo->cwnd -= chk->book_size;
  643                                         chk->rec.data.chunk_was_revoked = 0;
  644                                 }
  645                                 net->marked_retrans++;
  646                                 stcb->asoc.marked_retrans++;
  647                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  648                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  649                                             chk->whoTo->flight_size,
  650                                             chk->book_size,
  651                                             (uintptr_t) chk->whoTo,
  652                                             chk->rec.data.TSN_seq);
  653                                 }
  654                                 sctp_flight_size_decrease(chk);
  655                                 sctp_total_flight_decrease(stcb, chk);
  656                                 stcb->asoc.peers_rwnd += chk->send_size;
  657                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  658                         }
  659                         chk->sent = SCTP_DATAGRAM_RESEND;
  660                         SCTP_STAT_INCR(sctps_markedretrans);
  661 
  662                         /* reset the TSN for striking and other FR stuff */
  663                         chk->rec.data.doing_fast_retransmit = 0;
  664                         /* Clear any time so NO RTT is being done */
  665 
  666                         if (chk->do_rtt) {
  667                                 if (chk->whoTo->rto_needed == 0) {
  668                                         chk->whoTo->rto_needed = 1;
  669                                 }
  670                         }
  671                         chk->do_rtt = 0;
  672                         if (alt != net) {
  673                                 sctp_free_remote_addr(chk->whoTo);
  674                                 chk->no_fr_allowed = 1;
  675                                 chk->whoTo = alt;
  676                                 atomic_add_int(&alt->ref_count, 1);
  677                         } else {
  678                                 chk->no_fr_allowed = 0;
  679                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  680                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  681                                 } else {
  682                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
  683                                 }
  684                         }
  685                         /*
  686                          * CMT: Do not allow FRs on retransmitted TSNs.
  687                          */
  688                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  689                                 chk->no_fr_allowed = 1;
  690                         }
  691 #ifdef THIS_SHOULD_NOT_BE_DONE
  692                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  693                         /* remember highest acked one */
  694                         could_be_sent = chk;
  695 #endif
  696                 }
  697                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  698                         cnt_mk++;
  699                 }
  700         }
  701         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  702                 /* we did not subtract the same things? */
  703                 audit_tf = 1;
  704         }
  705         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  706                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  707         }
  708 #ifdef SCTP_DEBUG
  709         if (num_mk) {
  710                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  711                     tsnlast);
  712                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
  713                     num_mk, (u_long)stcb->asoc.peers_rwnd);
  714                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  715                     tsnlast);
  716                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
  717                     num_mk,
  718                     (int)stcb->asoc.peers_rwnd);
  719         }
  720 #endif
  721         *num_marked = num_mk;
  722         *num_abandoned = cnt_abandoned;
  723         /*
  724          * Now check for a ECN Echo that may be stranded And include the
  725          * cnt_mk'd to have all resends in the control queue.
  726          */
  727         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  728                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  729                         cnt_mk++;
  730                 }
  731                 if ((chk->whoTo == net) &&
  732                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  733                         sctp_free_remote_addr(chk->whoTo);
  734                         chk->whoTo = alt;
  735                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  736                                 chk->sent = SCTP_DATAGRAM_RESEND;
  737                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  738                                 cnt_mk++;
  739                         }
  740                         atomic_add_int(&alt->ref_count, 1);
  741                 }
  742         }
  743 #ifdef THIS_SHOULD_NOT_BE_DONE
  744         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  745                 /* fix it so we retransmit the highest acked anyway */
  746                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  747                 cnt_mk++;
  748                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  749         }
  750 #endif
  751         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  752 #ifdef INVARIANTS
  753                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  754                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  755 #endif
  756 #ifndef SCTP_AUDITING_ENABLED
  757                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  758 #endif
  759         }
  760         if (audit_tf) {
  761                 SCTPDBG(SCTP_DEBUG_TIMER4,
  762                     "Audit total flight due to negative value net:%p\n",
  763                     (void *)net);
  764                 stcb->asoc.total_flight = 0;
  765                 stcb->asoc.total_flight_count = 0;
  766                 /* Clear all networks flight size */
  767                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  768                         lnets->flight_size = 0;
  769                         SCTPDBG(SCTP_DEBUG_TIMER4,
  770                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  771                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
  772                 }
  773                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  774                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  775                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  776                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  777                                             chk->whoTo->flight_size,
  778                                             chk->book_size,
  779                                             (uintptr_t) chk->whoTo,
  780                                             chk->rec.data.TSN_seq);
  781                                 }
  782                                 sctp_flight_size_increase(chk);
  783                                 sctp_total_flight_increase(stcb, chk);
  784                         }
  785                 }
  786         }
  787         /* We return 1 if we only have a window probe outstanding */
  788         return (0);
  789 }
  790 
  791 
  792 int
  793 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  794     struct sctp_tcb *stcb,
  795     struct sctp_nets *net)
  796 {
  797         struct sctp_nets *alt;
  798         int win_probe, num_mk, num_abandoned;
  799 
  800         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  801                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  802         }
  803         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  804                 struct sctp_nets *lnet;
  805 
  806                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  807                         if (net == lnet) {
  808                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  809                         } else {
  810                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  811                         }
  812                 }
  813         }
  814         /* Find an alternate and mark those for retransmission */
  815         if ((stcb->asoc.peers_rwnd == 0) &&
  816             (stcb->asoc.total_flight < net->mtu)) {
  817                 SCTP_STAT_INCR(sctps_timowindowprobe);
  818                 win_probe = 1;
  819         } else {
  820                 win_probe = 0;
  821         }
  822 
  823         if (win_probe == 0) {
  824                 /* We don't do normal threshold management on window probes */
  825                 if (sctp_threshold_management(inp, stcb, net,
  826                     stcb->asoc.max_send_times)) {
  827                         /* Association was destroyed */
  828                         return (1);
  829                 } else {
  830                         if (net != stcb->asoc.primary_destination) {
  831                                 /* send a immediate HB if our RTO is stale */
  832                                 struct timeval now;
  833                                 unsigned int ms_goneby;
  834 
  835                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  836                                 if (net->last_sent_time.tv_sec) {
  837                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  838                                 } else {
  839                                         ms_goneby = 0;
  840                                 }
  841                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  842                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  843                                                 /*
  844                                                  * no recent feed back in an
  845                                                  * RTO or more, request a
  846                                                  * RTT update
  847                                                  */
  848                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  849                                         }
  850                                 }
  851                         }
  852                 }
  853         } else {
  854                 /*
  855                  * For a window probe we don't penalize the net's but only
  856                  * the association. This may fail it if SACKs are not coming
  857                  * back. If sack's are coming with rwnd locked at 0, we will
  858                  * continue to hold things waiting for rwnd to raise
  859                  */
  860                 if (sctp_threshold_management(inp, stcb, NULL,
  861                     stcb->asoc.max_send_times)) {
  862                         /* Association was destroyed */
  863                         return (1);
  864                 }
  865         }
  866         if (stcb->asoc.sctp_cmt_on_off > 0) {
  867                 if (net->pf_threshold < net->failure_threshold) {
  868                         alt = sctp_find_alternate_net(stcb, net, 2);
  869                 } else {
  870                         /*
  871                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  872                          * being used, then pick dest with largest ssthresh
  873                          * for any retransmission.
  874                          */
  875                         alt = sctp_find_alternate_net(stcb, net, 1);
  876                         /*
  877                          * CUCv2: If a different dest is picked for the
  878                          * retransmission, then new (rtx-)pseudo_cumack
  879                          * needs to be tracked for orig dest. Let CUCv2
  880                          * track new (rtx-) pseudo-cumack always.
  881                          */
  882                         net->find_pseudo_cumack = 1;
  883                         net->find_rtx_pseudo_cumack = 1;
  884                 }
  885         } else {
  886                 alt = sctp_find_alternate_net(stcb, net, 0);
  887         }
  888 
  889         num_mk = 0;
  890         num_abandoned = 0;
  891         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  892             &num_mk, &num_abandoned);
  893         /* FR Loss recovery just ended with the T3. */
  894         stcb->asoc.fast_retran_loss_recovery = 0;
  895 
  896         /* CMT FR loss recovery ended with the T3 */
  897         net->fast_retran_loss_recovery = 0;
  898         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  899             (net->flight_size == 0)) {
  900                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  901         }
  902         /*
  903          * setup the sat loss recovery that prevents satellite cwnd advance.
  904          */
  905         stcb->asoc.sat_t3_loss_recovery = 1;
  906         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  907 
  908         /* Backoff the timer and cwnd */
  909         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  910         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  911             (net->dest_state & SCTP_ADDR_PF)) {
  912                 /* Move all pending over too */
  913                 sctp_move_chunks_from_net(stcb, net);
  914 
  915                 /*
  916                  * Get the address that failed, to force a new src address
  917                  * selecton and a route allocation.
  918                  */
  919                 if (net->ro._s_addr) {
  920                         sctp_free_ifa(net->ro._s_addr);
  921                         net->ro._s_addr = NULL;
  922                 }
  923                 net->src_addr_selected = 0;
  924 
  925                 /* Force a route allocation too */
  926                 if (net->ro.ro_rt) {
  927                         RTFREE(net->ro.ro_rt);
  928                         net->ro.ro_rt = NULL;
  929                 }
  930                 /* Was it our primary? */
  931                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  932                         /*
  933                          * Yes, note it as such and find an alternate note:
  934                          * this means HB code must use this to resent the
  935                          * primary if it goes active AND if someone does a
  936                          * change-primary then this flag must be cleared
  937                          * from any net structures.
  938                          */
  939                         if (stcb->asoc.alternate) {
  940                                 sctp_free_remote_addr(stcb->asoc.alternate);
  941                         }
  942                         stcb->asoc.alternate = alt;
  943                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  944                 }
  945         }
  946         /*
  947          * Special case for cookie-echo'ed case, we don't do output but must
  948          * await the COOKIE-ACK before retransmission
  949          */
  950         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  951                 /*
  952                  * Here we just reset the timer and start again since we
  953                  * have not established the asoc
  954                  */
  955                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  956                 return (0);
  957         }
  958         if (stcb->asoc.peer_supports_prsctp) {
  959                 struct sctp_tmit_chunk *lchk;
  960 
  961                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  962                 /* C3. See if we need to send a Fwd-TSN */
  963                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  964                         send_forward_tsn(stcb, &stcb->asoc);
  965                         if (lchk) {
  966                                 /* Assure a timer is up */
  967                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  968                         }
  969                 }
  970         }
  971         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  972                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  973         }
  974         return (0);
  975 }
  976 
  977 int
  978 sctp_t1init_timer(struct sctp_inpcb *inp,
  979     struct sctp_tcb *stcb,
  980     struct sctp_nets *net)
  981 {
  982         /* bump the thresholds */
  983         if (stcb->asoc.delayed_connection) {
  984                 /*
  985                  * special hook for delayed connection. The library did NOT
  986                  * complete the rest of its sends.
  987                  */
  988                 stcb->asoc.delayed_connection = 0;
  989                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
  990                 return (0);
  991         }
  992         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
  993                 return (0);
  994         }
  995         if (sctp_threshold_management(inp, stcb, net,
  996             stcb->asoc.max_init_times)) {
  997                 /* Association was destroyed */
  998                 return (1);
  999         }
 1000         stcb->asoc.dropped_special_cnt = 0;
 1001         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1002         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1003                 net->RTO = stcb->asoc.initial_init_rto_max;
 1004         }
 1005         if (stcb->asoc.numnets > 1) {
 1006                 /* If we have more than one addr use it */
 1007                 struct sctp_nets *alt;
 1008 
 1009                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1010                 if (alt != stcb->asoc.primary_destination) {
 1011                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1012                         stcb->asoc.primary_destination = alt;
 1013                 }
 1014         }
 1015         /* Send out a new init */
 1016         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1017         return (0);
 1018 }
 1019 
 1020 /*
 1021  * For cookie and asconf we actually need to find and mark for resend, then
 1022  * increment the resend counter (after all the threshold management stuff of
 1023  * course).
 1024  */
 1025 int
 1026 sctp_cookie_timer(struct sctp_inpcb *inp,
 1027     struct sctp_tcb *stcb,
 1028     struct sctp_nets *net SCTP_UNUSED)
 1029 {
 1030         struct sctp_nets *alt;
 1031         struct sctp_tmit_chunk *cookie;
 1032 
 1033         /* first before all else we must find the cookie */
 1034         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1035                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1036                         break;
 1037                 }
 1038         }
 1039         if (cookie == NULL) {
 1040                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 1041                         /* FOOBAR! */
 1042                         struct mbuf *op_err;
 1043 
 1044                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
 1045                             "Cookie timer expired, but no cookie");
 1046                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4;
 1047                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 1048                 } else {
 1049 #ifdef INVARIANTS
 1050                         panic("Cookie timer expires in wrong state?");
 1051 #else
 1052                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
 1053                         return (0);
 1054 #endif
 1055                 }
 1056                 return (0);
 1057         }
 1058         /* Ok we found the cookie, threshold management next */
 1059         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1060             stcb->asoc.max_init_times)) {
 1061                 /* Assoc is over */
 1062                 return (1);
 1063         }
 1064         /*
 1065          * cleared theshold management now lets backoff the address & select
 1066          * an alternate
 1067          */
 1068         stcb->asoc.dropped_special_cnt = 0;
 1069         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1070         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1071         if (alt != cookie->whoTo) {
 1072                 sctp_free_remote_addr(cookie->whoTo);
 1073                 cookie->whoTo = alt;
 1074                 atomic_add_int(&alt->ref_count, 1);
 1075         }
 1076         /* Now mark the retran info */
 1077         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1078                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1079         }
 1080         cookie->sent = SCTP_DATAGRAM_RESEND;
 1081         /*
 1082          * Now call the output routine to kick out the cookie again, Note we
 1083          * don't mark any chunks for retran so that FR will need to kick in
 1084          * to move these (or a send timer).
 1085          */
 1086         return (0);
 1087 }
 1088 
 1089 int
 1090 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1091     struct sctp_nets *net)
 1092 {
 1093         struct sctp_nets *alt;
 1094         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1095 
 1096         if (stcb->asoc.stream_reset_outstanding == 0) {
 1097                 return (0);
 1098         }
 1099         /* find the existing STRRESET, we use the seq number we sent out on */
 1100         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1101         if (strrst == NULL) {
 1102                 return (0);
 1103         }
 1104         /* do threshold management */
 1105         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
 1106             stcb->asoc.max_send_times)) {
 1107                 /* Assoc is over */
 1108                 return (1);
 1109         }
 1110         /*
 1111          * cleared theshold management now lets backoff the address & select
 1112          * an alternate
 1113          */
 1114         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
 1115         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
 1116         sctp_free_remote_addr(strrst->whoTo);
 1117         strrst->whoTo = alt;
 1118         atomic_add_int(&alt->ref_count, 1);
 1119 
 1120         /* See if a ECN Echo is also stranded */
 1121         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1122                 if ((chk->whoTo == net) &&
 1123                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1124                         sctp_free_remote_addr(chk->whoTo);
 1125                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1126                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1127                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1128                         }
 1129                         chk->whoTo = alt;
 1130                         atomic_add_int(&alt->ref_count, 1);
 1131                 }
 1132         }
 1133         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1134                 /*
 1135                  * If the address went un-reachable, we need to move to
 1136                  * alternates for ALL chk's in queue
 1137                  */
 1138                 sctp_move_chunks_from_net(stcb, net);
 1139         }
 1140         /* mark the retran info */
 1141         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1142                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1143         strrst->sent = SCTP_DATAGRAM_RESEND;
 1144 
 1145         /* restart the timer */
 1146         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 1147         return (0);
 1148 }
 1149 
 1150 int
 1151 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1152     struct sctp_nets *net)
 1153 {
 1154         struct sctp_nets *alt;
 1155         struct sctp_tmit_chunk *asconf, *chk;
 1156 
 1157         /* is this a first send, or a retransmission? */
 1158         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1159                 /* compose a new ASCONF chunk and send it */
 1160                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1161         } else {
 1162                 /*
 1163                  * Retransmission of the existing ASCONF is needed
 1164                  */
 1165 
 1166                 /* find the existing ASCONF */
 1167                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1168                 if (asconf == NULL) {
 1169                         return (0);
 1170                 }
 1171                 /* do threshold management */
 1172                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 1173                     stcb->asoc.max_send_times)) {
 1174                         /* Assoc is over */
 1175                         return (1);
 1176                 }
 1177                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1178                         /*
 1179                          * Something is rotten: our peer is not responding
 1180                          * to ASCONFs but apparently is to other chunks.
 1181                          * i.e. it is not properly handling the chunk type
 1182                          * upper bits. Mark this peer as ASCONF incapable
 1183                          * and cleanup.
 1184                          */
 1185                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1186                         sctp_asconf_cleanup(stcb, net);
 1187                         return (0);
 1188                 }
 1189                 /*
 1190                  * cleared threshold management, so now backoff the net and
 1191                  * select an alternate
 1192                  */
 1193                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 1194                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 1195                 if (asconf->whoTo != alt) {
 1196                         sctp_free_remote_addr(asconf->whoTo);
 1197                         asconf->whoTo = alt;
 1198                         atomic_add_int(&alt->ref_count, 1);
 1199                 }
 1200                 /* See if an ECN Echo is also stranded */
 1201                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1202                         if ((chk->whoTo == net) &&
 1203                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1204                                 sctp_free_remote_addr(chk->whoTo);
 1205                                 chk->whoTo = alt;
 1206                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1207                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1208                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1209                                 }
 1210                                 atomic_add_int(&alt->ref_count, 1);
 1211                         }
 1212                 }
 1213                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1214                         if (chk->whoTo != alt) {
 1215                                 sctp_free_remote_addr(chk->whoTo);
 1216                                 chk->whoTo = alt;
 1217                                 atomic_add_int(&alt->ref_count, 1);
 1218                         }
 1219                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1220                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1221                         chk->sent = SCTP_DATAGRAM_RESEND;
 1222                 }
 1223                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1224                         /*
 1225                          * If the address went un-reachable, we need to move
 1226                          * to the alternate for ALL chunks in queue
 1227                          */
 1228                         sctp_move_chunks_from_net(stcb, net);
 1229                 }
 1230                 /* mark the retran info */
 1231                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1232                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1233                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1234 
 1235                 /* send another ASCONF if any and we can do */
 1236                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1237         }
 1238         return (0);
 1239 }
 1240 
 1241 /* Mobility adaptation */
 1242 void
 1243 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1244     struct sctp_nets *net SCTP_UNUSED)
 1245 {
 1246         if (stcb->asoc.deleted_primary == NULL) {
 1247                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1248                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1249                 return;
 1250         }
 1251         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1252         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1253         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1254         stcb->asoc.deleted_primary = NULL;
 1255         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1256         return;
 1257 }
 1258 
 1259 /*
 1260  * For the shutdown and shutdown-ack, we do not keep one around on the
 1261  * control queue. This means we must generate a new one and call the general
 1262  * chunk output routine, AFTER having done threshold management.
 1263  * It is assumed that net is non-NULL.
 1264  */
 1265 int
 1266 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1267     struct sctp_nets *net)
 1268 {
 1269         struct sctp_nets *alt;
 1270 
 1271         /* first threshold managment */
 1272         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1273                 /* Assoc is over */
 1274                 return (1);
 1275         }
 1276         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1277         /* second select an alternative */
 1278         alt = sctp_find_alternate_net(stcb, net, 0);
 1279 
 1280         /* third generate a shutdown into the queue for out net */
 1281         sctp_send_shutdown(stcb, alt);
 1282 
 1283         /* fourth restart timer */
 1284         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1285         return (0);
 1286 }
 1287 
 1288 int
 1289 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1290     struct sctp_nets *net)
 1291 {
 1292         struct sctp_nets *alt;
 1293 
 1294         /* first threshold managment */
 1295         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1296                 /* Assoc is over */
 1297                 return (1);
 1298         }
 1299         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1300         /* second select an alternative */
 1301         alt = sctp_find_alternate_net(stcb, net, 0);
 1302 
 1303         /* third generate a shutdown into the queue for out net */
 1304         sctp_send_shutdown_ack(stcb, alt);
 1305 
 1306         /* fourth restart timer */
 1307         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1308         return (0);
 1309 }
 1310 
 1311 static void
 1312 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1313     struct sctp_tcb *stcb)
 1314 {
 1315         struct sctp_stream_queue_pending *sp;
 1316         unsigned int i, chks_in_queue = 0;
 1317         int being_filled = 0;
 1318 
 1319         /*
 1320          * This function is ONLY called when the send/sent queues are empty.
 1321          */
 1322         if ((stcb == NULL) || (inp == NULL))
 1323                 return;
 1324 
 1325         if (stcb->asoc.sent_queue_retran_cnt) {
 1326                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1327                     stcb->asoc.sent_queue_retran_cnt);
 1328                 stcb->asoc.sent_queue_retran_cnt = 0;
 1329         }
 1330         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1331                 /* No stream scheduler information, initialize scheduler */
 1332                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1333                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1334                         /* yep, we lost a stream or two */
 1335                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1336                 } else {
 1337                         /* no streams lost */
 1338                         stcb->asoc.total_output_queue_size = 0;
 1339                 }
 1340         }
 1341         /* Check to see if some data queued, if so report it */
 1342         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1343                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1344                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1345                                 if (sp->msg_is_complete)
 1346                                         being_filled++;
 1347                                 chks_in_queue++;
 1348                         }
 1349                 }
 1350         }
 1351         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1352                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1353                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1354         }
 1355         if (chks_in_queue) {
 1356                 /* call the output queue function */
 1357                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1358                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1359                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1360                         /*
 1361                          * Probably should go in and make it go back through
 1362                          * and add fragments allowed
 1363                          */
 1364                         if (being_filled == 0) {
 1365                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1366                                     chks_in_queue);
 1367                         }
 1368                 }
 1369         } else {
 1370                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1371                     (u_long)stcb->asoc.total_output_queue_size);
 1372                 stcb->asoc.total_output_queue_size = 0;
 1373         }
 1374 }
 1375 
 1376 int
 1377 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1378     struct sctp_nets *net)
 1379 {
 1380         uint8_t net_was_pf;
 1381 
 1382         if (net->dest_state & SCTP_ADDR_PF) {
 1383                 net_was_pf = 1;
 1384         } else {
 1385                 net_was_pf = 0;
 1386         }
 1387         if (net->hb_responded == 0) {
 1388                 if (net->ro._s_addr) {
 1389                         /*
 1390                          * Invalidate the src address if we did not get a
 1391                          * response last time.
 1392                          */
 1393                         sctp_free_ifa(net->ro._s_addr);
 1394                         net->ro._s_addr = NULL;
 1395                         net->src_addr_selected = 0;
 1396                 }
 1397                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1398                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1399                         /* Assoc is over */
 1400                         return (1);
 1401                 }
 1402         }
 1403         /* Zero PBA, if it needs it */
 1404         if (net->partial_bytes_acked) {
 1405                 net->partial_bytes_acked = 0;
 1406         }
 1407         if ((stcb->asoc.total_output_queue_size > 0) &&
 1408             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1409             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1410                 sctp_audit_stream_queues_for_size(inp, stcb);
 1411         }
 1412         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1413             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1414                 /*
 1415                  * when move to PF during threshold mangement, a HB has been
 1416                  * queued in that routine
 1417                  */
 1418                 uint32_t ms_gone_by;
 1419 
 1420                 if ((net->last_sent_time.tv_sec > 0) ||
 1421                     (net->last_sent_time.tv_usec > 0)) {
 1422                         struct timeval diff;
 1423 
 1424                         SCTP_GETTIME_TIMEVAL(&diff);
 1425                         timevalsub(&diff, &net->last_sent_time);
 1426                         ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
 1427                             (uint32_t) (diff.tv_usec / 1000);
 1428                 } else {
 1429                         ms_gone_by = 0xffffffff;
 1430                 }
 1431                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1432                     (net->dest_state & SCTP_ADDR_PF)) {
 1433                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1434                 }
 1435         }
 1436         return (0);
 1437 }
 1438 
 1439 void
 1440 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1441     struct sctp_tcb *stcb,
 1442     struct sctp_nets *net)
 1443 {
 1444         uint32_t next_mtu, mtu;
 1445 
 1446         next_mtu = sctp_get_next_mtu(net->mtu);
 1447 
 1448         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1449                 if ((net->src_addr_selected == 0) ||
 1450                     (net->ro._s_addr == NULL) ||
 1451                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1452                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1453                                 sctp_free_ifa(net->ro._s_addr);
 1454                                 net->ro._s_addr = NULL;
 1455                                 net->src_addr_selected = 0;
 1456                         } else if (net->ro._s_addr == NULL) {
 1457 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1458                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1459                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1460 
 1461                                         /* KAME hack: embed scopeid */
 1462                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1463                                 }
 1464 #endif
 1465 
 1466                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1467                                     stcb,
 1468                                     (sctp_route_t *) & net->ro,
 1469                                     net, 0, stcb->asoc.vrf_id);
 1470 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1471                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1472                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1473 
 1474                                         (void)sa6_recoverscope(sin6);
 1475                                 }
 1476 #endif                          /* INET6 */
 1477                         }
 1478                         if (net->ro._s_addr)
 1479                                 net->src_addr_selected = 1;
 1480                 }
 1481                 if (net->ro._s_addr) {
 1482                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1483                         if (net->port) {
 1484                                 mtu -= sizeof(struct udphdr);
 1485                         }
 1486                         if (mtu > next_mtu) {
 1487                                 net->mtu = next_mtu;
 1488                         }
 1489                 }
 1490         }
 1491         /* restart the timer */
 1492         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1493 }
 1494 
 1495 void
 1496 sctp_autoclose_timer(struct sctp_inpcb *inp,
 1497     struct sctp_tcb *stcb,
 1498     struct sctp_nets *net)
 1499 {
 1500         struct timeval tn, *tim_touse;
 1501         struct sctp_association *asoc;
 1502         int ticks_gone_by;
 1503 
 1504         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1505         if (stcb->asoc.sctp_autoclose_ticks &&
 1506             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1507                 /* Auto close is on */
 1508                 asoc = &stcb->asoc;
 1509                 /* pick the time to use */
 1510                 if (asoc->time_last_rcvd.tv_sec >
 1511                     asoc->time_last_sent.tv_sec) {
 1512                         tim_touse = &asoc->time_last_rcvd;
 1513                 } else {
 1514                         tim_touse = &asoc->time_last_sent;
 1515                 }
 1516                 /* Now has long enough transpired to autoclose? */
 1517                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 1518                 if ((ticks_gone_by > 0) &&
 1519                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
 1520                         /*
 1521                          * autoclose time has hit, call the output routine,
 1522                          * which should do nothing just to be SURE we don't
 1523                          * have hanging data. We can then safely check the
 1524                          * queues and know that we are clear to send
 1525                          * shutdown
 1526                          */
 1527                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1528                         /* Are we clean? */
 1529                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1530                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1531                                 /*
 1532                                  * there is nothing queued to send, so I'm
 1533                                  * done...
 1534                                  */
 1535                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1536                                         /* only send SHUTDOWN 1st time thru */
 1537                                         struct sctp_nets *netp;
 1538 
 1539                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 1540                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1541                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1542                                         }
 1543                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 1544                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 1545                                         sctp_stop_timers_for_shutdown(stcb);
 1546                                         if (stcb->asoc.alternate) {
 1547                                                 netp = stcb->asoc.alternate;
 1548                                         } else {
 1549                                                 netp = stcb->asoc.primary_destination;
 1550                                         }
 1551                                         sctp_send_shutdown(stcb, netp);
 1552                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1553                                             stcb->sctp_ep, stcb,
 1554                                             netp);
 1555                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1556                                             stcb->sctp_ep, stcb,
 1557                                             netp);
 1558                                 }
 1559                         }
 1560                 } else {
 1561                         /*
 1562                          * No auto close at this time, reset t-o to check
 1563                          * later
 1564                          */
 1565                         int tmp;
 1566 
 1567                         /* fool the timer startup to use the time left */
 1568                         tmp = asoc->sctp_autoclose_ticks;
 1569                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1570                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1571                             net);
 1572                         /* restore the real tick value */
 1573                         asoc->sctp_autoclose_ticks = tmp;
 1574                 }
 1575         }
 1576 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_timer.c

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