The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/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/11.1/sys/netinet/sctp_timer.c 319407 2017-06-01 09:18:03Z 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 static 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                                     inp, stcb, net,
  115                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
  116                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, 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_BASE_SYSCTL(sctp_diag_info_code),
  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         }                       /* JRS 5/14/07 - If mode is set to 1, use the
  290                                  * CMT policy for choosing an alternate net. */
  291         else if (mode == 1) {
  292                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  293                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  294                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  295                                 /*
  296                                  * will skip ones that are not-reachable or
  297                                  * unconfirmed
  298                                  */
  299                                 continue;
  300                         }
  301                         if (max_cwnd < mnet->cwnd) {
  302                                 max_cwnd_net = mnet;
  303                                 max_cwnd = mnet->cwnd;
  304                         } else if (max_cwnd == mnet->cwnd) {
  305                                 uint32_t rndval;
  306                                 uint8_t this_random;
  307 
  308                                 if (stcb->asoc.hb_random_idx > 3) {
  309                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  310                                         memcpy(stcb->asoc.hb_random_values, &rndval,
  311                                             sizeof(stcb->asoc.hb_random_values));
  312                                         this_random = stcb->asoc.hb_random_values[0];
  313                                         stcb->asoc.hb_random_idx = 0;
  314                                         stcb->asoc.hb_ect_randombit = 0;
  315                                 } else {
  316                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  317                                         stcb->asoc.hb_random_idx++;
  318                                         stcb->asoc.hb_ect_randombit = 0;
  319                                 }
  320                                 if (this_random % 2) {
  321                                         max_cwnd_net = mnet;
  322                                         max_cwnd = mnet->cwnd;
  323                                 }
  324                         }
  325                 }
  326                 if (max_cwnd_net) {
  327                         return (max_cwnd_net);
  328                 }
  329         }
  330         mnet = net;
  331         once = 0;
  332 
  333         if (mnet == NULL) {
  334                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
  335                 if (mnet == NULL) {
  336                         return (NULL);
  337                 }
  338         }
  339         for (;;) {
  340                 alt = TAILQ_NEXT(mnet, sctp_next);
  341                 if (alt == NULL) {
  342                         once++;
  343                         if (once > 1) {
  344                                 break;
  345                         }
  346                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  347                         if (alt == NULL) {
  348                                 return (NULL);
  349                         }
  350                 }
  351                 if (alt->ro.ro_rt == NULL) {
  352                         if (alt->ro._s_addr) {
  353                                 sctp_free_ifa(alt->ro._s_addr);
  354                                 alt->ro._s_addr = NULL;
  355                         }
  356                         alt->src_addr_selected = 0;
  357                 }
  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         }
  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                 for (;;) {
  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                                 if (alt == NULL) {
  384                                         break;
  385                                 }
  386                         }
  387                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  388                             (alt != net)) {
  389                                 /* Found an alternate address */
  390                                 break;
  391                         }
  392                         mnet = alt;
  393                 }
  394         }
  395         if (alt == NULL) {
  396                 return (net);
  397         }
  398         return (alt);
  399 }
  400 
  401 static void
  402 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
  403     struct sctp_nets *net,
  404     int win_probe,
  405     int num_marked, int num_abandoned)
  406 {
  407         if (net->RTO == 0) {
  408                 if (net->RTO_measured) {
  409                         net->RTO = stcb->asoc.minrto;
  410                 } else {
  411                         net->RTO = stcb->asoc.initial_rto;
  412                 }
  413         }
  414         net->RTO <<= 1;
  415         if (net->RTO > stcb->asoc.maxrto) {
  416                 net->RTO = stcb->asoc.maxrto;
  417         }
  418         if ((win_probe == 0) && (num_marked || num_abandoned)) {
  419                 /* We don't apply penalty to window probe scenarios */
  420                 /* JRS - Use the congestion control given in the CC module */
  421                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
  422         }
  423 }
  424 
  425 #ifndef INVARIANTS
  426 static void
  427 sctp_recover_sent_list(struct sctp_tcb *stcb)
  428 {
  429         struct sctp_tmit_chunk *chk, *nchk;
  430         struct sctp_association *asoc;
  431 
  432         asoc = &stcb->asoc;
  433         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  434                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
  435                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
  436                             (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
  437                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
  438                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
  439                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
  440                                 }
  441                         }
  442                         if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
  443                             (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
  444                             TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
  445                                 asoc->trigger_reset = 1;
  446                         }
  447                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  448                         if (PR_SCTP_ENABLED(chk->flags)) {
  449                                 if (asoc->pr_sctp_cnt != 0)
  450                                         asoc->pr_sctp_cnt--;
  451                         }
  452                         if (chk->data) {
  453                                 /* sa_ignore NO_NULL_CHK */
  454                                 sctp_free_bufspace(stcb, asoc, chk, 1);
  455                                 sctp_m_freem(chk->data);
  456                                 chk->data = NULL;
  457                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
  458                                         asoc->sent_queue_cnt_removeable--;
  459                                 }
  460                         }
  461                         asoc->sent_queue_cnt--;
  462                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  463                 }
  464         }
  465         SCTP_PRINTF("after recover order is as follows\n");
  466         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  467                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.tsn);
  468         }
  469 }
  470 #endif
  471 
  472 static int
  473 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
  474     struct sctp_nets *net,
  475     struct sctp_nets *alt,
  476     int window_probe,
  477     int *num_marked,
  478     int *num_abandoned)
  479 {
  480 
  481         /*
  482          * Mark all chunks (well not all) that were sent to *net for
  483          * retransmission. Move them to alt for there destination as well...
  484          * We only mark chunks that have been outstanding long enough to
  485          * have received feed-back.
  486          */
  487         struct sctp_tmit_chunk *chk, *nchk;
  488         struct sctp_nets *lnets;
  489         struct timeval now, min_wait, tv;
  490         int cur_rto;
  491         int cnt_abandoned;
  492         int audit_tf, num_mk, fir;
  493         unsigned int cnt_mk;
  494         uint32_t orig_flight, orig_tf;
  495         uint32_t tsnlast, tsnfirst;
  496         int recovery_cnt = 0;
  497 
  498 
  499         /* none in flight now */
  500         audit_tf = 0;
  501         fir = 0;
  502         /*
  503          * figure out how long a data chunk must be pending before we can
  504          * mark it ..
  505          */
  506         (void)SCTP_GETTIME_TIMEVAL(&now);
  507         /* get cur rto in micro-seconds */
  508         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
  509         cur_rto *= 1000;
  510         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  511                 sctp_log_fr(cur_rto,
  512                     stcb->asoc.peers_rwnd,
  513                     window_probe,
  514                     SCTP_FR_T3_MARK_TIME);
  515                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
  516                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
  517         }
  518         tv.tv_sec = cur_rto / 1000000;
  519         tv.tv_usec = cur_rto % 1000000;
  520         min_wait = now;
  521         timevalsub(&min_wait, &tv);
  522         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
  523                 /*
  524                  * if we hit here, we don't have enough seconds on the clock
  525                  * to account for the RTO. We just let the lower seconds be
  526                  * the bounds and don't worry about it. This may mean we
  527                  * will mark a lot more than we should.
  528                  */
  529                 min_wait.tv_sec = min_wait.tv_usec = 0;
  530         }
  531         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  532                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
  533                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
  534         }
  535         /*
  536          * Our rwnd will be incorrect here since we are not adding back the
  537          * cnt * mbuf but we will fix that down below.
  538          */
  539         orig_flight = net->flight_size;
  540         orig_tf = stcb->asoc.total_flight;
  541 
  542         net->fast_retran_ip = 0;
  543         /* Now on to each chunk */
  544         cnt_abandoned = 0;
  545         num_mk = cnt_mk = 0;
  546         tsnfirst = tsnlast = 0;
  547 #ifndef INVARIANTS
  548 start_again:
  549 #endif
  550         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
  551                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
  552                         /* Strange case our list got out of order? */
  553                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
  554                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
  555                         recovery_cnt++;
  556 #ifdef INVARIANTS
  557                         panic("last acked >= chk on sent-Q");
  558 #else
  559                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
  560                         sctp_recover_sent_list(stcb);
  561                         if (recovery_cnt < 10) {
  562                                 goto start_again;
  563                         } else {
  564                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
  565                         }
  566 #endif
  567                 }
  568                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
  569                         /*
  570                          * found one to mark: If it is less than
  571                          * DATAGRAM_ACKED it MUST not be a skipped or marked
  572                          * TSN but instead one that is either already set
  573                          * for retransmission OR one that needs
  574                          * retransmission.
  575                          */
  576 
  577                         /* validate its been outstanding long enough */
  578                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  579                                 sctp_log_fr(chk->rec.data.tsn,
  580                                     chk->sent_rcv_time.tv_sec,
  581                                     chk->sent_rcv_time.tv_usec,
  582                                     SCTP_FR_T3_MARK_TIME);
  583                         }
  584                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
  585                                 /*
  586                                  * we have reached a chunk that was sent
  587                                  * some seconds past our min.. forget it we
  588                                  * will find no more to send.
  589                                  */
  590                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  591                                         sctp_log_fr(0,
  592                                             chk->sent_rcv_time.tv_sec,
  593                                             chk->sent_rcv_time.tv_usec,
  594                                             SCTP_FR_T3_STOPPED);
  595                                 }
  596                                 continue;
  597                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
  598                             (window_probe == 0)) {
  599                                 /*
  600                                  * we must look at the micro seconds to
  601                                  * know.
  602                                  */
  603                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
  604                                         /*
  605                                          * ok it was sent after our boundary
  606                                          * time.
  607                                          */
  608                                         continue;
  609                                 }
  610                         }
  611                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
  612                                 /* Is it expired? */
  613                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
  614                                         /* Yes so drop it */
  615                                         if (chk->data) {
  616                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  617                                                     chk,
  618                                                     1,
  619                                                     SCTP_SO_NOT_LOCKED);
  620                                                 cnt_abandoned++;
  621                                         }
  622                                         continue;
  623                                 }
  624                         }
  625                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
  626                                 /* Has it been retransmitted tv_sec times? */
  627                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
  628                                         if (chk->data) {
  629                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  630                                                     chk,
  631                                                     1,
  632                                                     SCTP_SO_NOT_LOCKED);
  633                                                 cnt_abandoned++;
  634                                         }
  635                                         continue;
  636                                 }
  637                         }
  638                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  639                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  640                                 num_mk++;
  641                                 if (fir == 0) {
  642                                         fir = 1;
  643                                         tsnfirst = chk->rec.data.tsn;
  644                                 }
  645                                 tsnlast = chk->rec.data.tsn;
  646                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  647                                         sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
  648                                             0, SCTP_FR_T3_MARKED);
  649                                 }
  650                                 if (chk->rec.data.chunk_was_revoked) {
  651                                         /* deflate the cwnd */
  652                                         chk->whoTo->cwnd -= chk->book_size;
  653                                         chk->rec.data.chunk_was_revoked = 0;
  654                                 }
  655                                 net->marked_retrans++;
  656                                 stcb->asoc.marked_retrans++;
  657                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  658                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  659                                             chk->whoTo->flight_size,
  660                                             chk->book_size,
  661                                             (uint32_t)(uintptr_t)chk->whoTo,
  662                                             chk->rec.data.tsn);
  663                                 }
  664                                 sctp_flight_size_decrease(chk);
  665                                 sctp_total_flight_decrease(stcb, chk);
  666                                 stcb->asoc.peers_rwnd += chk->send_size;
  667                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  668                         }
  669                         chk->sent = SCTP_DATAGRAM_RESEND;
  670                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  671                         SCTP_STAT_INCR(sctps_markedretrans);
  672 
  673                         /* reset the TSN for striking and other FR stuff */
  674                         chk->rec.data.doing_fast_retransmit = 0;
  675                         /* Clear any time so NO RTT is being done */
  676 
  677                         if (chk->do_rtt) {
  678                                 if (chk->whoTo->rto_needed == 0) {
  679                                         chk->whoTo->rto_needed = 1;
  680                                 }
  681                         }
  682                         chk->do_rtt = 0;
  683                         if (alt != net) {
  684                                 sctp_free_remote_addr(chk->whoTo);
  685                                 chk->no_fr_allowed = 1;
  686                                 chk->whoTo = alt;
  687                                 atomic_add_int(&alt->ref_count, 1);
  688                         } else {
  689                                 chk->no_fr_allowed = 0;
  690                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  691                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  692                                 } else {
  693                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
  694                                 }
  695                         }
  696                         /*
  697                          * CMT: Do not allow FRs on retransmitted TSNs.
  698                          */
  699                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  700                                 chk->no_fr_allowed = 1;
  701                         }
  702 #ifdef THIS_SHOULD_NOT_BE_DONE
  703                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  704                         /* remember highest acked one */
  705                         could_be_sent = chk;
  706 #endif
  707                 }
  708                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  709                         cnt_mk++;
  710                 }
  711         }
  712         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  713                 /* we did not subtract the same things? */
  714                 audit_tf = 1;
  715         }
  716         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  717                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  718         }
  719 #ifdef SCTP_DEBUG
  720         if (num_mk) {
  721                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  722                     tsnlast);
  723                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
  724                     num_mk,
  725                     stcb->asoc.peers_rwnd);
  726         }
  727 #endif
  728         *num_marked = num_mk;
  729         *num_abandoned = cnt_abandoned;
  730         /*
  731          * Now check for a ECN Echo that may be stranded And include the
  732          * cnt_mk'd to have all resends in the control queue.
  733          */
  734         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  735                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  736                         cnt_mk++;
  737                 }
  738                 if ((chk->whoTo == net) &&
  739                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  740                         sctp_free_remote_addr(chk->whoTo);
  741                         chk->whoTo = alt;
  742                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  743                                 chk->sent = SCTP_DATAGRAM_RESEND;
  744                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  745                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  746                                 cnt_mk++;
  747                         }
  748                         atomic_add_int(&alt->ref_count, 1);
  749                 }
  750         }
  751 #ifdef THIS_SHOULD_NOT_BE_DONE
  752         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  753                 /* fix it so we retransmit the highest acked anyway */
  754                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  755                 cnt_mk++;
  756                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  757         }
  758 #endif
  759         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  760 #ifdef INVARIANTS
  761                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  762                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  763 #endif
  764 #ifndef SCTP_AUDITING_ENABLED
  765                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  766 #endif
  767         }
  768         if (audit_tf) {
  769                 SCTPDBG(SCTP_DEBUG_TIMER4,
  770                     "Audit total flight due to negative value net:%p\n",
  771                     (void *)net);
  772                 stcb->asoc.total_flight = 0;
  773                 stcb->asoc.total_flight_count = 0;
  774                 /* Clear all networks flight size */
  775                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  776                         lnets->flight_size = 0;
  777                         SCTPDBG(SCTP_DEBUG_TIMER4,
  778                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  779                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
  780                 }
  781                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  782                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  783                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  784                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  785                                             chk->whoTo->flight_size,
  786                                             chk->book_size,
  787                                             (uint32_t)(uintptr_t)chk->whoTo,
  788                                             chk->rec.data.tsn);
  789                                 }
  790                                 sctp_flight_size_increase(chk);
  791                                 sctp_total_flight_increase(stcb, chk);
  792                         }
  793                 }
  794         }
  795         /* We return 1 if we only have a window probe outstanding */
  796         return (0);
  797 }
  798 
  799 
  800 int
  801 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  802     struct sctp_tcb *stcb,
  803     struct sctp_nets *net)
  804 {
  805         struct sctp_nets *alt;
  806         int win_probe, num_mk, num_abandoned;
  807 
  808         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  809                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  810         }
  811         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  812                 struct sctp_nets *lnet;
  813 
  814                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  815                         if (net == lnet) {
  816                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  817                         } else {
  818                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  819                         }
  820                 }
  821         }
  822         /* Find an alternate and mark those for retransmission */
  823         if ((stcb->asoc.peers_rwnd == 0) &&
  824             (stcb->asoc.total_flight < net->mtu)) {
  825                 SCTP_STAT_INCR(sctps_timowindowprobe);
  826                 win_probe = 1;
  827         } else {
  828                 win_probe = 0;
  829         }
  830 
  831         if (win_probe == 0) {
  832                 /* We don't do normal threshold management on window probes */
  833                 if (sctp_threshold_management(inp, stcb, net,
  834                     stcb->asoc.max_send_times)) {
  835                         /* Association was destroyed */
  836                         return (1);
  837                 } else {
  838                         if (net != stcb->asoc.primary_destination) {
  839                                 /* send a immediate HB if our RTO is stale */
  840                                 struct timeval now;
  841                                 unsigned int ms_goneby;
  842 
  843                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  844                                 if (net->last_sent_time.tv_sec) {
  845                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  846                                 } else {
  847                                         ms_goneby = 0;
  848                                 }
  849                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  850                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  851                                                 /*
  852                                                  * no recent feed back in an
  853                                                  * RTO or more, request a
  854                                                  * RTT update
  855                                                  */
  856                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  857                                         }
  858                                 }
  859                         }
  860                 }
  861         } else {
  862                 /*
  863                  * For a window probe we don't penalize the net's but only
  864                  * the association. This may fail it if SACKs are not coming
  865                  * back. If sack's are coming with rwnd locked at 0, we will
  866                  * continue to hold things waiting for rwnd to raise
  867                  */
  868                 if (sctp_threshold_management(inp, stcb, NULL,
  869                     stcb->asoc.max_send_times)) {
  870                         /* Association was destroyed */
  871                         return (1);
  872                 }
  873         }
  874         if (stcb->asoc.sctp_cmt_on_off > 0) {
  875                 if (net->pf_threshold < net->failure_threshold) {
  876                         alt = sctp_find_alternate_net(stcb, net, 2);
  877                 } else {
  878                         /*
  879                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  880                          * being used, then pick dest with largest ssthresh
  881                          * for any retransmission.
  882                          */
  883                         alt = sctp_find_alternate_net(stcb, net, 1);
  884                         /*
  885                          * CUCv2: If a different dest is picked for the
  886                          * retransmission, then new (rtx-)pseudo_cumack
  887                          * needs to be tracked for orig dest. Let CUCv2
  888                          * track new (rtx-) pseudo-cumack always.
  889                          */
  890                         net->find_pseudo_cumack = 1;
  891                         net->find_rtx_pseudo_cumack = 1;
  892                 }
  893         } else {
  894                 alt = sctp_find_alternate_net(stcb, net, 0);
  895         }
  896 
  897         num_mk = 0;
  898         num_abandoned = 0;
  899         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  900             &num_mk, &num_abandoned);
  901         /* FR Loss recovery just ended with the T3. */
  902         stcb->asoc.fast_retran_loss_recovery = 0;
  903 
  904         /* CMT FR loss recovery ended with the T3 */
  905         net->fast_retran_loss_recovery = 0;
  906         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  907             (net->flight_size == 0)) {
  908                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  909         }
  910         /*
  911          * setup the sat loss recovery that prevents satellite cwnd advance.
  912          */
  913         stcb->asoc.sat_t3_loss_recovery = 1;
  914         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  915 
  916         /* Backoff the timer and cwnd */
  917         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  918         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  919             (net->dest_state & SCTP_ADDR_PF)) {
  920                 /* Move all pending over too */
  921                 sctp_move_chunks_from_net(stcb, net);
  922 
  923                 /*
  924                  * Get the address that failed, to force a new src address
  925                  * selecton and a route allocation.
  926                  */
  927                 if (net->ro._s_addr) {
  928                         sctp_free_ifa(net->ro._s_addr);
  929                         net->ro._s_addr = NULL;
  930                 }
  931                 net->src_addr_selected = 0;
  932 
  933                 /* Force a route allocation too */
  934                 if (net->ro.ro_rt) {
  935                         RTFREE(net->ro.ro_rt);
  936                         net->ro.ro_rt = NULL;
  937                 }
  938                 /* Was it our primary? */
  939                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  940                         /*
  941                          * Yes, note it as such and find an alternate note:
  942                          * this means HB code must use this to resent the
  943                          * primary if it goes active AND if someone does a
  944                          * change-primary then this flag must be cleared
  945                          * from any net structures.
  946                          */
  947                         if (stcb->asoc.alternate) {
  948                                 sctp_free_remote_addr(stcb->asoc.alternate);
  949                         }
  950                         stcb->asoc.alternate = alt;
  951                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  952                 }
  953         }
  954         /*
  955          * Special case for cookie-echo'ed case, we don't do output but must
  956          * await the COOKIE-ACK before retransmission
  957          */
  958         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  959                 /*
  960                  * Here we just reset the timer and start again since we
  961                  * have not established the asoc
  962                  */
  963                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  964                 return (0);
  965         }
  966         if (stcb->asoc.prsctp_supported) {
  967                 struct sctp_tmit_chunk *lchk;
  968 
  969                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  970                 /* C3. See if we need to send a Fwd-TSN */
  971                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  972                         send_forward_tsn(stcb, &stcb->asoc);
  973                         if (lchk) {
  974                                 /* Assure a timer is up */
  975                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  976                         }
  977                 }
  978         }
  979         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  980                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  981         }
  982         return (0);
  983 }
  984 
  985 int
  986 sctp_t1init_timer(struct sctp_inpcb *inp,
  987     struct sctp_tcb *stcb,
  988     struct sctp_nets *net)
  989 {
  990         /* bump the thresholds */
  991         if (stcb->asoc.delayed_connection) {
  992                 /*
  993                  * special hook for delayed connection. The library did NOT
  994                  * complete the rest of its sends.
  995                  */
  996                 stcb->asoc.delayed_connection = 0;
  997                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
  998                 return (0);
  999         }
 1000         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
 1001                 return (0);
 1002         }
 1003         if (sctp_threshold_management(inp, stcb, net,
 1004             stcb->asoc.max_init_times)) {
 1005                 /* Association was destroyed */
 1006                 return (1);
 1007         }
 1008         stcb->asoc.dropped_special_cnt = 0;
 1009         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1010         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1011                 net->RTO = stcb->asoc.initial_init_rto_max;
 1012         }
 1013         if (stcb->asoc.numnets > 1) {
 1014                 /* If we have more than one addr use it */
 1015                 struct sctp_nets *alt;
 1016 
 1017                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1018                 if (alt != stcb->asoc.primary_destination) {
 1019                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1020                         stcb->asoc.primary_destination = alt;
 1021                 }
 1022         }
 1023         /* Send out a new init */
 1024         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1025         return (0);
 1026 }
 1027 
 1028 /*
 1029  * For cookie and asconf we actually need to find and mark for resend, then
 1030  * increment the resend counter (after all the threshold management stuff of
 1031  * course).
 1032  */
 1033 int
 1034 sctp_cookie_timer(struct sctp_inpcb *inp,
 1035     struct sctp_tcb *stcb,
 1036     struct sctp_nets *net SCTP_UNUSED)
 1037 {
 1038         struct sctp_nets *alt;
 1039         struct sctp_tmit_chunk *cookie;
 1040 
 1041         /* first before all else we must find the cookie */
 1042         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1043                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1044                         break;
 1045                 }
 1046         }
 1047         if (cookie == NULL) {
 1048                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 1049                         /* FOOBAR! */
 1050                         struct mbuf *op_err;
 1051 
 1052                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 1053                             "Cookie timer expired, but no cookie");
 1054                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
 1055                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 1056                 } else {
 1057 #ifdef INVARIANTS
 1058                         panic("Cookie timer expires in wrong state?");
 1059 #else
 1060                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
 1061                         return (0);
 1062 #endif
 1063                 }
 1064                 return (0);
 1065         }
 1066         /* Ok we found the cookie, threshold management next */
 1067         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1068             stcb->asoc.max_init_times)) {
 1069                 /* Assoc is over */
 1070                 return (1);
 1071         }
 1072         /*
 1073          * Cleared threshold management, now lets backoff the address and
 1074          * select an alternate
 1075          */
 1076         stcb->asoc.dropped_special_cnt = 0;
 1077         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1078         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1079         if (alt != cookie->whoTo) {
 1080                 sctp_free_remote_addr(cookie->whoTo);
 1081                 cookie->whoTo = alt;
 1082                 atomic_add_int(&alt->ref_count, 1);
 1083         }
 1084         /* Now mark the retran info */
 1085         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1086                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1087         }
 1088         cookie->sent = SCTP_DATAGRAM_RESEND;
 1089         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1090         /*
 1091          * Now call the output routine to kick out the cookie again, Note we
 1092          * don't mark any chunks for retran so that FR will need to kick in
 1093          * to move these (or a send timer).
 1094          */
 1095         return (0);
 1096 }
 1097 
 1098 int
 1099 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1100     struct sctp_nets *net)
 1101 {
 1102         struct sctp_nets *alt;
 1103         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1104 
 1105         if (stcb->asoc.stream_reset_outstanding == 0) {
 1106                 return (0);
 1107         }
 1108         /* find the existing STRRESET, we use the seq number we sent out on */
 1109         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1110         if (strrst == NULL) {
 1111                 return (0);
 1112         }
 1113         /* do threshold management */
 1114         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
 1115             stcb->asoc.max_send_times)) {
 1116                 /* Assoc is over */
 1117                 return (1);
 1118         }
 1119         /*
 1120          * Cleared threshold management, now lets backoff the address and
 1121          * select an alternate
 1122          */
 1123         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
 1124         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
 1125         sctp_free_remote_addr(strrst->whoTo);
 1126         strrst->whoTo = alt;
 1127         atomic_add_int(&alt->ref_count, 1);
 1128 
 1129         /* See if a ECN Echo is also stranded */
 1130         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1131                 if ((chk->whoTo == net) &&
 1132                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1133                         sctp_free_remote_addr(chk->whoTo);
 1134                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1135                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1136                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1137                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1138                         }
 1139                         chk->whoTo = alt;
 1140                         atomic_add_int(&alt->ref_count, 1);
 1141                 }
 1142         }
 1143         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1144                 /*
 1145                  * If the address went un-reachable, we need to move to
 1146                  * alternates for ALL chk's in queue
 1147                  */
 1148                 sctp_move_chunks_from_net(stcb, net);
 1149         }
 1150         /* mark the retran info */
 1151         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1152                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1153         strrst->sent = SCTP_DATAGRAM_RESEND;
 1154         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1155 
 1156         /* restart the timer */
 1157         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 1158         return (0);
 1159 }
 1160 
 1161 int
 1162 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1163     struct sctp_nets *net)
 1164 {
 1165         struct sctp_nets *alt;
 1166         struct sctp_tmit_chunk *asconf, *chk;
 1167 
 1168         /* is this a first send, or a retransmission? */
 1169         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1170                 /* compose a new ASCONF chunk and send it */
 1171                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1172         } else {
 1173                 /*
 1174                  * Retransmission of the existing ASCONF is needed
 1175                  */
 1176 
 1177                 /* find the existing ASCONF */
 1178                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1179                 if (asconf == NULL) {
 1180                         return (0);
 1181                 }
 1182                 /* do threshold management */
 1183                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 1184                     stcb->asoc.max_send_times)) {
 1185                         /* Assoc is over */
 1186                         return (1);
 1187                 }
 1188                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1189                         /*
 1190                          * Something is rotten: our peer is not responding
 1191                          * to ASCONFs but apparently is to other chunks.
 1192                          * i.e. it is not properly handling the chunk type
 1193                          * upper bits. Mark this peer as ASCONF incapable
 1194                          * and cleanup.
 1195                          */
 1196                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1197                         sctp_asconf_cleanup(stcb, net);
 1198                         return (0);
 1199                 }
 1200                 /*
 1201                  * cleared threshold management, so now backoff the net and
 1202                  * select an alternate
 1203                  */
 1204                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 1205                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 1206                 if (asconf->whoTo != alt) {
 1207                         sctp_free_remote_addr(asconf->whoTo);
 1208                         asconf->whoTo = alt;
 1209                         atomic_add_int(&alt->ref_count, 1);
 1210                 }
 1211                 /* See if an ECN Echo is also stranded */
 1212                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1213                         if ((chk->whoTo == net) &&
 1214                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1215                                 sctp_free_remote_addr(chk->whoTo);
 1216                                 chk->whoTo = alt;
 1217                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1218                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1219                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1220                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1221                                 }
 1222                                 atomic_add_int(&alt->ref_count, 1);
 1223                         }
 1224                 }
 1225                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1226                         if (chk->whoTo != alt) {
 1227                                 sctp_free_remote_addr(chk->whoTo);
 1228                                 chk->whoTo = alt;
 1229                                 atomic_add_int(&alt->ref_count, 1);
 1230                         }
 1231                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1232                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1233                         chk->sent = SCTP_DATAGRAM_RESEND;
 1234                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1235                 }
 1236                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1237                         /*
 1238                          * If the address went un-reachable, we need to move
 1239                          * to the alternate for ALL chunks in queue
 1240                          */
 1241                         sctp_move_chunks_from_net(stcb, net);
 1242                 }
 1243                 /* mark the retran info */
 1244                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1245                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1246                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1247                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1248 
 1249                 /* send another ASCONF if any and we can do */
 1250                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1251         }
 1252         return (0);
 1253 }
 1254 
 1255 /* Mobility adaptation */
 1256 void
 1257 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1258     struct sctp_nets *net SCTP_UNUSED)
 1259 {
 1260         if (stcb->asoc.deleted_primary == NULL) {
 1261                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1262                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1263                 return;
 1264         }
 1265         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1266         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1267         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1268         stcb->asoc.deleted_primary = NULL;
 1269         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1270         return;
 1271 }
 1272 
 1273 /*
 1274  * For the shutdown and shutdown-ack, we do not keep one around on the
 1275  * control queue. This means we must generate a new one and call the general
 1276  * chunk output routine, AFTER having done threshold management.
 1277  * It is assumed that net is non-NULL.
 1278  */
 1279 int
 1280 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1281     struct sctp_nets *net)
 1282 {
 1283         struct sctp_nets *alt;
 1284 
 1285         /* first threshold management */
 1286         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1287                 /* Assoc is over */
 1288                 return (1);
 1289         }
 1290         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1291         /* second select an alternative */
 1292         alt = sctp_find_alternate_net(stcb, net, 0);
 1293 
 1294         /* third generate a shutdown into the queue for out net */
 1295         sctp_send_shutdown(stcb, alt);
 1296 
 1297         /* fourth restart timer */
 1298         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1299         return (0);
 1300 }
 1301 
 1302 int
 1303 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1304     struct sctp_nets *net)
 1305 {
 1306         struct sctp_nets *alt;
 1307 
 1308         /* first threshold management */
 1309         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1310                 /* Assoc is over */
 1311                 return (1);
 1312         }
 1313         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1314         /* second select an alternative */
 1315         alt = sctp_find_alternate_net(stcb, net, 0);
 1316 
 1317         /* third generate a shutdown into the queue for out net */
 1318         sctp_send_shutdown_ack(stcb, alt);
 1319 
 1320         /* fourth restart timer */
 1321         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1322         return (0);
 1323 }
 1324 
 1325 static void
 1326 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1327     struct sctp_tcb *stcb)
 1328 {
 1329         struct sctp_stream_queue_pending *sp;
 1330         unsigned int i, chks_in_queue = 0;
 1331         int being_filled = 0;
 1332 
 1333         /*
 1334          * This function is ONLY called when the send/sent queues are empty.
 1335          */
 1336         if ((stcb == NULL) || (inp == NULL))
 1337                 return;
 1338 
 1339         if (stcb->asoc.sent_queue_retran_cnt) {
 1340                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1341                     stcb->asoc.sent_queue_retran_cnt);
 1342                 stcb->asoc.sent_queue_retran_cnt = 0;
 1343         }
 1344         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1345                 /* No stream scheduler information, initialize scheduler */
 1346                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1347                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1348                         /* yep, we lost a stream or two */
 1349                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1350                 } else {
 1351                         /* no streams lost */
 1352                         stcb->asoc.total_output_queue_size = 0;
 1353                 }
 1354         }
 1355         /* Check to see if some data queued, if so report it */
 1356         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1357                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1358                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1359                                 if (sp->msg_is_complete)
 1360                                         being_filled++;
 1361                                 chks_in_queue++;
 1362                         }
 1363                 }
 1364         }
 1365         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1366                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1367                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1368         }
 1369         if (chks_in_queue) {
 1370                 /* call the output queue function */
 1371                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1372                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1373                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1374                         /*
 1375                          * Probably should go in and make it go back through
 1376                          * and add fragments allowed
 1377                          */
 1378                         if (being_filled == 0) {
 1379                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1380                                     chks_in_queue);
 1381                         }
 1382                 }
 1383         } else {
 1384                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1385                     (u_long)stcb->asoc.total_output_queue_size);
 1386                 stcb->asoc.total_output_queue_size = 0;
 1387         }
 1388 }
 1389 
 1390 int
 1391 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1392     struct sctp_nets *net)
 1393 {
 1394         uint8_t net_was_pf;
 1395 
 1396         if (net->dest_state & SCTP_ADDR_PF) {
 1397                 net_was_pf = 1;
 1398         } else {
 1399                 net_was_pf = 0;
 1400         }
 1401         if (net->hb_responded == 0) {
 1402                 if (net->ro._s_addr) {
 1403                         /*
 1404                          * Invalidate the src address if we did not get a
 1405                          * response last time.
 1406                          */
 1407                         sctp_free_ifa(net->ro._s_addr);
 1408                         net->ro._s_addr = NULL;
 1409                         net->src_addr_selected = 0;
 1410                 }
 1411                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1412                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1413                         /* Assoc is over */
 1414                         return (1);
 1415                 }
 1416         }
 1417         /* Zero PBA, if it needs it */
 1418         if (net->partial_bytes_acked) {
 1419                 net->partial_bytes_acked = 0;
 1420         }
 1421         if ((stcb->asoc.total_output_queue_size > 0) &&
 1422             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1423             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1424                 sctp_audit_stream_queues_for_size(inp, stcb);
 1425         }
 1426         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1427             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1428                 /*
 1429                  * when move to PF during threshold mangement, a HB has been
 1430                  * queued in that routine
 1431                  */
 1432                 uint32_t ms_gone_by;
 1433 
 1434                 if ((net->last_sent_time.tv_sec > 0) ||
 1435                     (net->last_sent_time.tv_usec > 0)) {
 1436                         struct timeval diff;
 1437 
 1438                         SCTP_GETTIME_TIMEVAL(&diff);
 1439                         timevalsub(&diff, &net->last_sent_time);
 1440                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
 1441                             (uint32_t)(diff.tv_usec / 1000);
 1442                 } else {
 1443                         ms_gone_by = 0xffffffff;
 1444                 }
 1445                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1446                     (net->dest_state & SCTP_ADDR_PF)) {
 1447                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1448                 }
 1449         }
 1450         return (0);
 1451 }
 1452 
 1453 void
 1454 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1455     struct sctp_tcb *stcb,
 1456     struct sctp_nets *net)
 1457 {
 1458         uint32_t next_mtu, mtu;
 1459 
 1460         next_mtu = sctp_get_next_mtu(net->mtu);
 1461 
 1462         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1463                 if ((net->src_addr_selected == 0) ||
 1464                     (net->ro._s_addr == NULL) ||
 1465                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1466                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1467                                 sctp_free_ifa(net->ro._s_addr);
 1468                                 net->ro._s_addr = NULL;
 1469                                 net->src_addr_selected = 0;
 1470                         } else if (net->ro._s_addr == NULL) {
 1471 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1472                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1473                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1474 
 1475                                         /* KAME hack: embed scopeid */
 1476                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1477                                 }
 1478 #endif
 1479 
 1480                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1481                                     stcb,
 1482                                     (sctp_route_t *)&net->ro,
 1483                                     net, 0, stcb->asoc.vrf_id);
 1484 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1485                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1486                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1487 
 1488                                         (void)sa6_recoverscope(sin6);
 1489                                 }
 1490 #endif                          /* INET6 */
 1491                         }
 1492                         if (net->ro._s_addr)
 1493                                 net->src_addr_selected = 1;
 1494                 }
 1495                 if (net->ro._s_addr) {
 1496                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1497 #if defined(INET) || defined(INET6)
 1498                         if (net->port) {
 1499                                 mtu -= sizeof(struct udphdr);
 1500                         }
 1501 #endif
 1502                         if (mtu > next_mtu) {
 1503                                 net->mtu = next_mtu;
 1504                         } else {
 1505                                 net->mtu = mtu;
 1506                         }
 1507                 }
 1508         }
 1509         /* restart the timer */
 1510         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1511 }
 1512 
 1513 void
 1514 sctp_autoclose_timer(struct sctp_inpcb *inp,
 1515     struct sctp_tcb *stcb,
 1516     struct sctp_nets *net)
 1517 {
 1518         struct timeval tn, *tim_touse;
 1519         struct sctp_association *asoc;
 1520         int ticks_gone_by;
 1521 
 1522         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1523         if (stcb->asoc.sctp_autoclose_ticks &&
 1524             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1525                 /* Auto close is on */
 1526                 asoc = &stcb->asoc;
 1527                 /* pick the time to use */
 1528                 if (asoc->time_last_rcvd.tv_sec >
 1529                     asoc->time_last_sent.tv_sec) {
 1530                         tim_touse = &asoc->time_last_rcvd;
 1531                 } else {
 1532                         tim_touse = &asoc->time_last_sent;
 1533                 }
 1534                 /* Now has long enough transpired to autoclose? */
 1535                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 1536                 if ((ticks_gone_by > 0) &&
 1537                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
 1538                         /*
 1539                          * autoclose time has hit, call the output routine,
 1540                          * which should do nothing just to be SURE we don't
 1541                          * have hanging data. We can then safely check the
 1542                          * queues and know that we are clear to send
 1543                          * shutdown
 1544                          */
 1545                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1546                         /* Are we clean? */
 1547                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1548                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1549                                 /*
 1550                                  * there is nothing queued to send, so I'm
 1551                                  * done...
 1552                                  */
 1553                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1554                                         /* only send SHUTDOWN 1st time thru */
 1555                                         struct sctp_nets *netp;
 1556 
 1557                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 1558                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1559                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1560                                         }
 1561                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 1562                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 1563                                         sctp_stop_timers_for_shutdown(stcb);
 1564                                         if (stcb->asoc.alternate) {
 1565                                                 netp = stcb->asoc.alternate;
 1566                                         } else {
 1567                                                 netp = stcb->asoc.primary_destination;
 1568                                         }
 1569                                         sctp_send_shutdown(stcb, netp);
 1570                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1571                                             stcb->sctp_ep, stcb,
 1572                                             netp);
 1573                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1574                                             stcb->sctp_ep, stcb,
 1575                                             netp);
 1576                                 }
 1577                         }
 1578                 } else {
 1579                         /*
 1580                          * No auto close at this time, reset t-o to check
 1581                          * later
 1582                          */
 1583                         int tmp;
 1584 
 1585                         /* fool the timer startup to use the time left */
 1586                         tmp = asoc->sctp_autoclose_ticks;
 1587                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1588                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1589                             net);
 1590                         /* restore the real tick value */
 1591                         asoc->sctp_autoclose_ticks = tmp;
 1592                 }
 1593         }
 1594 }

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