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 #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 
  651                                 if (chk->rec.data.chunk_was_revoked) {
  652                                         /* deflate the cwnd */
  653                                         chk->whoTo->cwnd -= chk->book_size;
  654                                         chk->rec.data.chunk_was_revoked = 0;
  655                                 }
  656                                 net->marked_retrans++;
  657                                 stcb->asoc.marked_retrans++;
  658                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  659                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  660                                             chk->whoTo->flight_size,
  661                                             chk->book_size,
  662                                             (uint32_t)(uintptr_t)chk->whoTo,
  663                                             chk->rec.data.tsn);
  664                                 }
  665                                 sctp_flight_size_decrease(chk);
  666                                 sctp_total_flight_decrease(stcb, chk);
  667                                 stcb->asoc.peers_rwnd += chk->send_size;
  668                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  669                         }
  670                         chk->sent = SCTP_DATAGRAM_RESEND;
  671                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  672                         SCTP_STAT_INCR(sctps_markedretrans);
  673 
  674                         /* reset the TSN for striking and other FR stuff */
  675                         chk->rec.data.doing_fast_retransmit = 0;
  676                         /* Clear any time so NO RTT is being done */
  677 
  678                         if (chk->do_rtt) {
  679                                 if (chk->whoTo->rto_needed == 0) {
  680                                         chk->whoTo->rto_needed = 1;
  681                                 }
  682                         }
  683                         chk->do_rtt = 0;
  684                         if (alt != net) {
  685                                 sctp_free_remote_addr(chk->whoTo);
  686                                 chk->no_fr_allowed = 1;
  687                                 chk->whoTo = alt;
  688                                 atomic_add_int(&alt->ref_count, 1);
  689                         } else {
  690                                 chk->no_fr_allowed = 0;
  691                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  692                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  693                                 } else {
  694                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
  695                                 }
  696                         }
  697                         /*
  698                          * CMT: Do not allow FRs on retransmitted TSNs.
  699                          */
  700                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  701                                 chk->no_fr_allowed = 1;
  702                         }
  703 #ifdef THIS_SHOULD_NOT_BE_DONE
  704                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  705                         /* remember highest acked one */
  706                         could_be_sent = chk;
  707 #endif
  708                 }
  709                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  710                         cnt_mk++;
  711                 }
  712         }
  713         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  714                 /* we did not subtract the same things? */
  715                 audit_tf = 1;
  716         }
  717 
  718         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  719                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  720         }
  721 #ifdef SCTP_DEBUG
  722         if (num_mk) {
  723                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  724                     tsnlast);
  725                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
  726                     num_mk,
  727                     stcb->asoc.peers_rwnd);
  728         }
  729 #endif
  730         *num_marked = num_mk;
  731         *num_abandoned = cnt_abandoned;
  732         /*
  733          * Now check for a ECN Echo that may be stranded And include the
  734          * cnt_mk'd to have all resends in the control queue.
  735          */
  736         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  737                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  738                         cnt_mk++;
  739                 }
  740                 if ((chk->whoTo == net) &&
  741                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  742                         sctp_free_remote_addr(chk->whoTo);
  743                         chk->whoTo = alt;
  744                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  745                                 chk->sent = SCTP_DATAGRAM_RESEND;
  746                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  747                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  748                                 cnt_mk++;
  749                         }
  750                         atomic_add_int(&alt->ref_count, 1);
  751                 }
  752         }
  753 #ifdef THIS_SHOULD_NOT_BE_DONE
  754         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  755                 /* fix it so we retransmit the highest acked anyway */
  756                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  757                 cnt_mk++;
  758                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  759         }
  760 #endif
  761         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  762 #ifdef INVARIANTS
  763                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  764                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  765 #endif
  766 #ifndef SCTP_AUDITING_ENABLED
  767                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  768 #endif
  769         }
  770         if (audit_tf) {
  771                 SCTPDBG(SCTP_DEBUG_TIMER4,
  772                     "Audit total flight due to negative value net:%p\n",
  773                     (void *)net);
  774                 stcb->asoc.total_flight = 0;
  775                 stcb->asoc.total_flight_count = 0;
  776                 /* Clear all networks flight size */
  777                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  778                         lnets->flight_size = 0;
  779                         SCTPDBG(SCTP_DEBUG_TIMER4,
  780                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  781                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
  782                 }
  783                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  784                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  785                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  786                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  787                                             chk->whoTo->flight_size,
  788                                             chk->book_size,
  789                                             (uint32_t)(uintptr_t)chk->whoTo,
  790                                             chk->rec.data.tsn);
  791                                 }
  792 
  793                                 sctp_flight_size_increase(chk);
  794                                 sctp_total_flight_increase(stcb, chk);
  795                         }
  796                 }
  797         }
  798         /* We return 1 if we only have a window probe outstanding */
  799         return (0);
  800 }
  801 
  802 
  803 int
  804 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  805     struct sctp_tcb *stcb,
  806     struct sctp_nets *net)
  807 {
  808         struct sctp_nets *alt;
  809         int win_probe, num_mk, num_abandoned;
  810 
  811         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  812                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  813         }
  814         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  815                 struct sctp_nets *lnet;
  816 
  817                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  818                         if (net == lnet) {
  819                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  820                         } else {
  821                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  822                         }
  823                 }
  824         }
  825         /* Find an alternate and mark those for retransmission */
  826         if ((stcb->asoc.peers_rwnd == 0) &&
  827             (stcb->asoc.total_flight < net->mtu)) {
  828                 SCTP_STAT_INCR(sctps_timowindowprobe);
  829                 win_probe = 1;
  830         } else {
  831                 win_probe = 0;
  832         }
  833 
  834         if (win_probe == 0) {
  835                 /* We don't do normal threshold management on window probes */
  836                 if (sctp_threshold_management(inp, stcb, net,
  837                     stcb->asoc.max_send_times)) {
  838                         /* Association was destroyed */
  839                         return (1);
  840                 } else {
  841                         if (net != stcb->asoc.primary_destination) {
  842                                 /* send a immediate HB if our RTO is stale */
  843                                 struct timeval now;
  844                                 unsigned int ms_goneby;
  845 
  846                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  847                                 if (net->last_sent_time.tv_sec) {
  848                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  849                                 } else {
  850                                         ms_goneby = 0;
  851                                 }
  852                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  853                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  854                                                 /*
  855                                                  * no recent feed back in an
  856                                                  * RTO or more, request a
  857                                                  * RTT update
  858                                                  */
  859                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  860                                         }
  861                                 }
  862                         }
  863                 }
  864         } else {
  865                 /*
  866                  * For a window probe we don't penalize the net's but only
  867                  * the association. This may fail it if SACKs are not coming
  868                  * back. If sack's are coming with rwnd locked at 0, we will
  869                  * continue to hold things waiting for rwnd to raise
  870                  */
  871                 if (sctp_threshold_management(inp, stcb, NULL,
  872                     stcb->asoc.max_send_times)) {
  873                         /* Association was destroyed */
  874                         return (1);
  875                 }
  876         }
  877         if (stcb->asoc.sctp_cmt_on_off > 0) {
  878                 if (net->pf_threshold < net->failure_threshold) {
  879                         alt = sctp_find_alternate_net(stcb, net, 2);
  880                 } else {
  881                         /*
  882                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  883                          * being used, then pick dest with largest ssthresh
  884                          * for any retransmission.
  885                          */
  886                         alt = sctp_find_alternate_net(stcb, net, 1);
  887                         /*
  888                          * CUCv2: If a different dest is picked for the
  889                          * retransmission, then new (rtx-)pseudo_cumack
  890                          * needs to be tracked for orig dest. Let CUCv2
  891                          * track new (rtx-) pseudo-cumack always.
  892                          */
  893                         net->find_pseudo_cumack = 1;
  894                         net->find_rtx_pseudo_cumack = 1;
  895                 }
  896         } else {
  897                 alt = sctp_find_alternate_net(stcb, net, 0);
  898         }
  899 
  900         num_mk = 0;
  901         num_abandoned = 0;
  902         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  903             &num_mk, &num_abandoned);
  904         /* FR Loss recovery just ended with the T3. */
  905         stcb->asoc.fast_retran_loss_recovery = 0;
  906 
  907         /* CMT FR loss recovery ended with the T3 */
  908         net->fast_retran_loss_recovery = 0;
  909         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  910             (net->flight_size == 0)) {
  911                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  912         }
  913 
  914         /*
  915          * setup the sat loss recovery that prevents satellite cwnd advance.
  916          */
  917         stcb->asoc.sat_t3_loss_recovery = 1;
  918         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  919 
  920         /* Backoff the timer and cwnd */
  921         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  922         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  923             (net->dest_state & SCTP_ADDR_PF)) {
  924                 /* Move all pending over too */
  925                 sctp_move_chunks_from_net(stcb, net);
  926 
  927                 /*
  928                  * Get the address that failed, to force a new src address
  929                  * selecton and a route allocation.
  930                  */
  931                 if (net->ro._s_addr) {
  932                         sctp_free_ifa(net->ro._s_addr);
  933                         net->ro._s_addr = NULL;
  934                 }
  935                 net->src_addr_selected = 0;
  936 
  937                 /* Force a route allocation too */
  938                 if (net->ro.ro_rt) {
  939                         RTFREE(net->ro.ro_rt);
  940                         net->ro.ro_rt = NULL;
  941                 }
  942 
  943                 /* Was it our primary? */
  944                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  945                         /*
  946                          * Yes, note it as such and find an alternate note:
  947                          * this means HB code must use this to resent the
  948                          * primary if it goes active AND if someone does a
  949                          * change-primary then this flag must be cleared
  950                          * from any net structures.
  951                          */
  952                         if (stcb->asoc.alternate) {
  953                                 sctp_free_remote_addr(stcb->asoc.alternate);
  954                         }
  955                         stcb->asoc.alternate = alt;
  956                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  957                 }
  958         }
  959         /*
  960          * Special case for cookie-echo'ed case, we don't do output but must
  961          * await the COOKIE-ACK before retransmission
  962          */
  963         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
  964                 /*
  965                  * Here we just reset the timer and start again since we
  966                  * have not established the asoc
  967                  */
  968                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  969                 return (0);
  970         }
  971         if (stcb->asoc.prsctp_supported) {
  972                 struct sctp_tmit_chunk *lchk;
  973 
  974                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  975                 /* C3. See if we need to send a Fwd-TSN */
  976                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  977                         send_forward_tsn(stcb, &stcb->asoc);
  978                         for (; lchk != NULL; lchk = TAILQ_NEXT(lchk, sctp_next)) {
  979                                 if (lchk->whoTo != NULL) {
  980                                         break;
  981                                 }
  982                         }
  983                         if (lchk != NULL) {
  984                                 /* Assure a timer is up */
  985                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  986                         }
  987                 }
  988         }
  989         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  990                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  991         }
  992         return (0);
  993 }
  994 
  995 int
  996 sctp_t1init_timer(struct sctp_inpcb *inp,
  997     struct sctp_tcb *stcb,
  998     struct sctp_nets *net)
  999 {
 1000         /* bump the thresholds */
 1001         if (stcb->asoc.delayed_connection) {
 1002                 /*
 1003                  * special hook for delayed connection. The library did NOT
 1004                  * complete the rest of its sends.
 1005                  */
 1006                 stcb->asoc.delayed_connection = 0;
 1007                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1008                 return (0);
 1009         }
 1010         if (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT) {
 1011                 return (0);
 1012         }
 1013         if (sctp_threshold_management(inp, stcb, net,
 1014             stcb->asoc.max_init_times)) {
 1015                 /* Association was destroyed */
 1016                 return (1);
 1017         }
 1018         stcb->asoc.dropped_special_cnt = 0;
 1019         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1020         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1021                 net->RTO = stcb->asoc.initial_init_rto_max;
 1022         }
 1023         if (stcb->asoc.numnets > 1) {
 1024                 /* If we have more than one addr use it */
 1025                 struct sctp_nets *alt;
 1026 
 1027                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1028                 if (alt != stcb->asoc.primary_destination) {
 1029                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1030                         stcb->asoc.primary_destination = alt;
 1031                 }
 1032         }
 1033         /* Send out a new init */
 1034         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1035         return (0);
 1036 }
 1037 
 1038 /*
 1039  * For cookie and asconf we actually need to find and mark for resend, then
 1040  * increment the resend counter (after all the threshold management stuff of
 1041  * course).
 1042  */
 1043 int
 1044 sctp_cookie_timer(struct sctp_inpcb *inp,
 1045     struct sctp_tcb *stcb,
 1046     struct sctp_nets *net SCTP_UNUSED)
 1047 {
 1048         struct sctp_nets *alt;
 1049         struct sctp_tmit_chunk *cookie;
 1050 
 1051         /* first before all else we must find the cookie */
 1052         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1053                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1054                         break;
 1055                 }
 1056         }
 1057         if (cookie == NULL) {
 1058                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 1059                         /* FOOBAR! */
 1060                         struct mbuf *op_err;
 1061 
 1062                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 1063                             "Cookie timer expired, but no cookie");
 1064                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
 1065                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 1066                 } else {
 1067 #ifdef INVARIANTS
 1068                         panic("Cookie timer expires in wrong state?");
 1069 #else
 1070                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(stcb));
 1071                         return (0);
 1072 #endif
 1073                 }
 1074                 return (0);
 1075         }
 1076         /* Ok we found the cookie, threshold management next */
 1077         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1078             stcb->asoc.max_init_times)) {
 1079                 /* Assoc is over */
 1080                 return (1);
 1081         }
 1082         /*
 1083          * Cleared threshold management, now lets backoff the address and
 1084          * select an alternate
 1085          */
 1086         stcb->asoc.dropped_special_cnt = 0;
 1087         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1088         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1089         if (alt != cookie->whoTo) {
 1090                 sctp_free_remote_addr(cookie->whoTo);
 1091                 cookie->whoTo = alt;
 1092                 atomic_add_int(&alt->ref_count, 1);
 1093         }
 1094         /* Now mark the retran info */
 1095         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1096                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1097         }
 1098         cookie->sent = SCTP_DATAGRAM_RESEND;
 1099         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1100         /*
 1101          * Now call the output routine to kick out the cookie again, Note we
 1102          * don't mark any chunks for retran so that FR will need to kick in
 1103          * to move these (or a send timer).
 1104          */
 1105         return (0);
 1106 }
 1107 
 1108 int
 1109 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1110     struct sctp_nets *net)
 1111 {
 1112         struct sctp_nets *alt;
 1113         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1114 
 1115         if (stcb->asoc.stream_reset_outstanding == 0) {
 1116                 return (0);
 1117         }
 1118         /* find the existing STRRESET, we use the seq number we sent out on */
 1119         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1120         if (strrst == NULL) {
 1121                 return (0);
 1122         }
 1123         /* do threshold management */
 1124         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
 1125             stcb->asoc.max_send_times)) {
 1126                 /* Assoc is over */
 1127                 return (1);
 1128         }
 1129         /*
 1130          * Cleared threshold management, now lets backoff the address and
 1131          * select an alternate
 1132          */
 1133         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
 1134         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
 1135         sctp_free_remote_addr(strrst->whoTo);
 1136         strrst->whoTo = alt;
 1137         atomic_add_int(&alt->ref_count, 1);
 1138 
 1139         /* See if a ECN Echo is also stranded */
 1140         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1141                 if ((chk->whoTo == net) &&
 1142                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1143                         sctp_free_remote_addr(chk->whoTo);
 1144                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1145                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1146                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1147                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1148                         }
 1149                         chk->whoTo = alt;
 1150                         atomic_add_int(&alt->ref_count, 1);
 1151                 }
 1152         }
 1153         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1154                 /*
 1155                  * If the address went un-reachable, we need to move to
 1156                  * alternates for ALL chk's in queue
 1157                  */
 1158                 sctp_move_chunks_from_net(stcb, net);
 1159         }
 1160         /* mark the retran info */
 1161         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1162                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1163         strrst->sent = SCTP_DATAGRAM_RESEND;
 1164         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1165 
 1166         /* restart the timer */
 1167         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 1168         return (0);
 1169 }
 1170 
 1171 int
 1172 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1173     struct sctp_nets *net)
 1174 {
 1175         struct sctp_nets *alt;
 1176         struct sctp_tmit_chunk *asconf, *chk;
 1177 
 1178         /* is this a first send, or a retransmission? */
 1179         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1180                 /* compose a new ASCONF chunk and send it */
 1181                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1182         } else {
 1183                 /*
 1184                  * Retransmission of the existing ASCONF is needed
 1185                  */
 1186 
 1187                 /* find the existing ASCONF */
 1188                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1189                 if (asconf == NULL) {
 1190                         return (0);
 1191                 }
 1192                 /* do threshold management */
 1193                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 1194                     stcb->asoc.max_send_times)) {
 1195                         /* Assoc is over */
 1196                         return (1);
 1197                 }
 1198                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1199                         /*
 1200                          * Something is rotten: our peer is not responding
 1201                          * to ASCONFs but apparently is to other chunks.
 1202                          * i.e. it is not properly handling the chunk type
 1203                          * upper bits. Mark this peer as ASCONF incapable
 1204                          * and cleanup.
 1205                          */
 1206                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1207                         sctp_asconf_cleanup(stcb, net);
 1208                         return (0);
 1209                 }
 1210                 /*
 1211                  * cleared threshold management, so now backoff the net and
 1212                  * select an alternate
 1213                  */
 1214                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 1215                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 1216                 if (asconf->whoTo != alt) {
 1217                         sctp_free_remote_addr(asconf->whoTo);
 1218                         asconf->whoTo = alt;
 1219                         atomic_add_int(&alt->ref_count, 1);
 1220                 }
 1221 
 1222                 /* See if an ECN Echo is also stranded */
 1223                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1224                         if ((chk->whoTo == net) &&
 1225                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1226                                 sctp_free_remote_addr(chk->whoTo);
 1227                                 chk->whoTo = alt;
 1228                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1229                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1230                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1231                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1232                                 }
 1233                                 atomic_add_int(&alt->ref_count, 1);
 1234                         }
 1235                 }
 1236                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1237                         if (chk->whoTo != alt) {
 1238                                 sctp_free_remote_addr(chk->whoTo);
 1239                                 chk->whoTo = alt;
 1240                                 atomic_add_int(&alt->ref_count, 1);
 1241                         }
 1242                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1243                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1244                         chk->sent = SCTP_DATAGRAM_RESEND;
 1245                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1246                 }
 1247                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1248                         /*
 1249                          * If the address went un-reachable, we need to move
 1250                          * to the alternate for ALL chunks in queue
 1251                          */
 1252                         sctp_move_chunks_from_net(stcb, net);
 1253                 }
 1254                 /* mark the retran info */
 1255                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1256                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1257                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1258                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1259 
 1260                 /* send another ASCONF if any and we can do */
 1261                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1262         }
 1263         return (0);
 1264 }
 1265 
 1266 /* Mobility adaptation */
 1267 void
 1268 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1269     struct sctp_nets *net SCTP_UNUSED)
 1270 {
 1271         if (stcb->asoc.deleted_primary == NULL) {
 1272                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1273                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1274                 return;
 1275         }
 1276         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1277         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1278         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1279         stcb->asoc.deleted_primary = NULL;
 1280         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1281         return;
 1282 }
 1283 
 1284 /*
 1285  * For the shutdown and shutdown-ack, we do not keep one around on the
 1286  * control queue. This means we must generate a new one and call the general
 1287  * chunk output routine, AFTER having done threshold management.
 1288  * It is assumed that net is non-NULL.
 1289  */
 1290 int
 1291 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1292     struct sctp_nets *net)
 1293 {
 1294         struct sctp_nets *alt;
 1295 
 1296         /* first threshold management */
 1297         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1298                 /* Assoc is over */
 1299                 return (1);
 1300         }
 1301         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1302         /* second select an alternative */
 1303         alt = sctp_find_alternate_net(stcb, net, 0);
 1304 
 1305         /* third generate a shutdown into the queue for out net */
 1306         sctp_send_shutdown(stcb, alt);
 1307 
 1308         /* fourth restart timer */
 1309         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1310         return (0);
 1311 }
 1312 
 1313 int
 1314 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1315     struct sctp_nets *net)
 1316 {
 1317         struct sctp_nets *alt;
 1318 
 1319         /* first threshold management */
 1320         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1321                 /* Assoc is over */
 1322                 return (1);
 1323         }
 1324         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1325         /* second select an alternative */
 1326         alt = sctp_find_alternate_net(stcb, net, 0);
 1327 
 1328         /* third generate a shutdown into the queue for out net */
 1329         sctp_send_shutdown_ack(stcb, alt);
 1330 
 1331         /* fourth restart timer */
 1332         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1333         return (0);
 1334 }
 1335 
 1336 static void
 1337 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1338     struct sctp_tcb *stcb)
 1339 {
 1340         struct sctp_stream_queue_pending *sp;
 1341         unsigned int i, chks_in_queue = 0;
 1342         int being_filled = 0;
 1343 
 1344         /*
 1345          * This function is ONLY called when the send/sent queues are empty.
 1346          */
 1347         if ((stcb == NULL) || (inp == NULL))
 1348                 return;
 1349 
 1350         if (stcb->asoc.sent_queue_retran_cnt) {
 1351                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1352                     stcb->asoc.sent_queue_retran_cnt);
 1353                 stcb->asoc.sent_queue_retran_cnt = 0;
 1354         }
 1355         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1356                 /* No stream scheduler information, initialize scheduler */
 1357                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1358                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1359                         /* yep, we lost a stream or two */
 1360                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1361                 } else {
 1362                         /* no streams lost */
 1363                         stcb->asoc.total_output_queue_size = 0;
 1364                 }
 1365         }
 1366         /* Check to see if some data queued, if so report it */
 1367         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1368                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1369                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1370                                 if (sp->msg_is_complete)
 1371                                         being_filled++;
 1372                                 chks_in_queue++;
 1373                         }
 1374                 }
 1375         }
 1376         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1377                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1378                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1379         }
 1380         if (chks_in_queue) {
 1381                 /* call the output queue function */
 1382                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1383                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1384                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1385                         /*
 1386                          * Probably should go in and make it go back through
 1387                          * and add fragments allowed
 1388                          */
 1389                         if (being_filled == 0) {
 1390                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1391                                     chks_in_queue);
 1392                         }
 1393                 }
 1394         } else {
 1395                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1396                     (u_long)stcb->asoc.total_output_queue_size);
 1397                 stcb->asoc.total_output_queue_size = 0;
 1398         }
 1399 }
 1400 
 1401 int
 1402 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1403     struct sctp_nets *net)
 1404 {
 1405         uint8_t net_was_pf;
 1406 
 1407         if (net->dest_state & SCTP_ADDR_PF) {
 1408                 net_was_pf = 1;
 1409         } else {
 1410                 net_was_pf = 0;
 1411         }
 1412         if (net->hb_responded == 0) {
 1413                 if (net->ro._s_addr) {
 1414                         /*
 1415                          * Invalidate the src address if we did not get a
 1416                          * response last time.
 1417                          */
 1418                         sctp_free_ifa(net->ro._s_addr);
 1419                         net->ro._s_addr = NULL;
 1420                         net->src_addr_selected = 0;
 1421                 }
 1422                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1423                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1424                         /* Assoc is over */
 1425                         return (1);
 1426                 }
 1427         }
 1428         /* Zero PBA, if it needs it */
 1429         if (net->partial_bytes_acked) {
 1430                 net->partial_bytes_acked = 0;
 1431         }
 1432         if ((stcb->asoc.total_output_queue_size > 0) &&
 1433             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1434             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1435                 sctp_audit_stream_queues_for_size(inp, stcb);
 1436         }
 1437         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1438             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1439                 /*
 1440                  * when move to PF during threshold mangement, a HB has been
 1441                  * queued in that routine
 1442                  */
 1443                 uint32_t ms_gone_by;
 1444 
 1445                 if ((net->last_sent_time.tv_sec > 0) ||
 1446                     (net->last_sent_time.tv_usec > 0)) {
 1447                         struct timeval diff;
 1448 
 1449                         SCTP_GETTIME_TIMEVAL(&diff);
 1450                         timevalsub(&diff, &net->last_sent_time);
 1451                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
 1452                             (uint32_t)(diff.tv_usec / 1000);
 1453                 } else {
 1454                         ms_gone_by = 0xffffffff;
 1455                 }
 1456                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1457                     (net->dest_state & SCTP_ADDR_PF)) {
 1458                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1459                 }
 1460         }
 1461         return (0);
 1462 }
 1463 
 1464 void
 1465 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1466     struct sctp_tcb *stcb,
 1467     struct sctp_nets *net)
 1468 {
 1469         uint32_t next_mtu, mtu;
 1470 
 1471         next_mtu = sctp_get_next_mtu(net->mtu);
 1472 
 1473         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1474                 if ((net->src_addr_selected == 0) ||
 1475                     (net->ro._s_addr == NULL) ||
 1476                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1477                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1478                                 sctp_free_ifa(net->ro._s_addr);
 1479                                 net->ro._s_addr = NULL;
 1480                                 net->src_addr_selected = 0;
 1481                         } else if (net->ro._s_addr == NULL) {
 1482 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1483                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1484                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1485 
 1486                                         /* KAME hack: embed scopeid */
 1487                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1488                                 }
 1489 #endif
 1490 
 1491                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1492                                     stcb,
 1493                                     (sctp_route_t *)&net->ro,
 1494                                     net, 0, stcb->asoc.vrf_id);
 1495 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1496                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1497                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1498 
 1499                                         (void)sa6_recoverscope(sin6);
 1500                                 }
 1501 #endif                          /* INET6 */
 1502                         }
 1503                         if (net->ro._s_addr)
 1504                                 net->src_addr_selected = 1;
 1505                 }
 1506                 if (net->ro._s_addr) {
 1507                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1508 #if defined(INET) || defined(INET6)
 1509                         if (net->port) {
 1510                                 mtu -= sizeof(struct udphdr);
 1511                         }
 1512 #endif
 1513                         if (mtu > next_mtu) {
 1514                                 net->mtu = next_mtu;
 1515                         } else {
 1516                                 net->mtu = mtu;
 1517                         }
 1518                 }
 1519         }
 1520         /* restart the timer */
 1521         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1522 }
 1523 
 1524 void
 1525 sctp_autoclose_timer(struct sctp_inpcb *inp,
 1526     struct sctp_tcb *stcb,
 1527     struct sctp_nets *net)
 1528 {
 1529         struct timeval tn, *tim_touse;
 1530         struct sctp_association *asoc;
 1531         int ticks_gone_by;
 1532 
 1533         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1534         if (stcb->asoc.sctp_autoclose_ticks &&
 1535             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1536                 /* Auto close is on */
 1537                 asoc = &stcb->asoc;
 1538                 /* pick the time to use */
 1539                 if (asoc->time_last_rcvd.tv_sec >
 1540                     asoc->time_last_sent.tv_sec) {
 1541                         tim_touse = &asoc->time_last_rcvd;
 1542                 } else {
 1543                         tim_touse = &asoc->time_last_sent;
 1544                 }
 1545                 /* Now has long enough transpired to autoclose? */
 1546                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 1547                 if ((ticks_gone_by > 0) &&
 1548                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
 1549                         /*
 1550                          * autoclose time has hit, call the output routine,
 1551                          * which should do nothing just to be SURE we don't
 1552                          * have hanging data. We can then safely check the
 1553                          * queues and know that we are clear to send
 1554                          * shutdown
 1555                          */
 1556                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1557                         /* Are we clean? */
 1558                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1559                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1560                                 /*
 1561                                  * there is nothing queued to send, so I'm
 1562                                  * done...
 1563                                  */
 1564                                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
 1565                                         /* only send SHUTDOWN 1st time thru */
 1566                                         struct sctp_nets *netp;
 1567 
 1568                                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 1569                                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1570                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1571                                         }
 1572                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
 1573                                         SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
 1574                                         sctp_stop_timers_for_shutdown(stcb);
 1575                                         if (stcb->asoc.alternate) {
 1576                                                 netp = stcb->asoc.alternate;
 1577                                         } else {
 1578                                                 netp = stcb->asoc.primary_destination;
 1579                                         }
 1580                                         sctp_send_shutdown(stcb, netp);
 1581                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1582                                             stcb->sctp_ep, stcb,
 1583                                             netp);
 1584                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1585                                             stcb->sctp_ep, stcb,
 1586                                             netp);
 1587                                 }
 1588                         }
 1589                 } else {
 1590                         /*
 1591                          * No auto close at this time, reset t-o to check
 1592                          * later
 1593                          */
 1594                         int tmp;
 1595 
 1596                         /* fool the timer startup to use the time left */
 1597                         tmp = asoc->sctp_autoclose_ticks;
 1598                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1599                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1600                             net);
 1601                         /* restore the real tick value */
 1602                         asoc->sctp_autoclose_ticks = tmp;
 1603                 }
 1604         }
 1605 }
Cache object: 36c0cefd44893498c1abb8e021c11b52
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_timer.c

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