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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/12.0/sys/netinet/sctp_timer.c 338134 2018-08-21 13:25:32Z tuexen $");
   37 
   38 #define _IP_VHL
   39 #include <netinet/sctp_os.h>
   40 #include <netinet/sctp_pcb.h>
   41 #ifdef INET6
   42 #endif
   43 #include <netinet/sctp_var.h>
   44 #include <netinet/sctp_sysctl.h>
   45 #include <netinet/sctp_timer.h>
   46 #include <netinet/sctputil.h>
   47 #include <netinet/sctp_output.h>
   48 #include <netinet/sctp_header.h>
   49 #include <netinet/sctp_indata.h>
   50 #include <netinet/sctp_asconf.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/sctp.h>
   53 #include <netinet/sctp_uio.h>
   54 #if defined(INET) || defined(INET6)
   55 #include <netinet/udp.h>
   56 #endif
   57 
   58 
   59 void
   60 sctp_audit_retranmission_queue(struct sctp_association *asoc)
   61 {
   62         struct sctp_tmit_chunk *chk;
   63 
   64         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
   65             asoc->sent_queue_retran_cnt,
   66             asoc->sent_queue_cnt);
   67         asoc->sent_queue_retran_cnt = 0;
   68         asoc->sent_queue_cnt = 0;
   69         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
   70                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   71                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   72                 }
   73                 asoc->sent_queue_cnt++;
   74         }
   75         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
   76                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   77                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   78                 }
   79         }
   80         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
   81                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   82                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   83                 }
   84         }
   85         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
   86             asoc->sent_queue_retran_cnt,
   87             asoc->sent_queue_cnt);
   88 }
   89 
   90 static int
   91 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   92     struct sctp_nets *net, uint16_t threshold)
   93 {
   94         if (net) {
   95                 net->error_count++;
   96                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
   97                     (void *)net, net->error_count,
   98                     net->failure_threshold);
   99                 if (net->error_count > net->failure_threshold) {
  100                         /* We had a threshold failure */
  101                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
  102                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
  103                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  104                                 net->dest_state &= ~SCTP_ADDR_PF;
  105                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  106                                     stcb, 0,
  107                                     (void *)net, SCTP_SO_NOT_LOCKED);
  108                         }
  109                 } else if ((net->pf_threshold < net->failure_threshold) &&
  110                     (net->error_count > net->pf_threshold)) {
  111                         if (!(net->dest_state & SCTP_ADDR_PF)) {
  112                                 net->dest_state |= SCTP_ADDR_PF;
  113                                 net->last_active = sctp_get_tick_count();
  114                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  115                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
  116                                     inp, stcb, net,
  117                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
  118                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
  119                         }
  120                 }
  121         }
  122         if (stcb == NULL)
  123                 return (0);
  124 
  125         if (net) {
  126                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
  127                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  128                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
  129                                     stcb->asoc.overall_error_count,
  130                                     (stcb->asoc.overall_error_count + 1),
  131                                     SCTP_FROM_SCTP_TIMER,
  132                                     __LINE__);
  133                         }
  134                         stcb->asoc.overall_error_count++;
  135                 }
  136         } else {
  137                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  138                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
  139                             stcb->asoc.overall_error_count,
  140                             (stcb->asoc.overall_error_count + 1),
  141                             SCTP_FROM_SCTP_TIMER,
  142                             __LINE__);
  143                 }
  144                 stcb->asoc.overall_error_count++;
  145         }
  146         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
  147             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
  148             (uint32_t)threshold,
  149             ((net == NULL) ? (uint32_t)0 : (uint32_t)net->dest_state));
  150         /*
  151          * We specifically do not do >= to give the assoc one more change
  152          * before we fail it.
  153          */
  154         if (stcb->asoc.overall_error_count > threshold) {
  155                 /* Abort notification sends a ULP notify */
  156                 struct mbuf *op_err;
  157 
  158                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  159                     "Association error counter exceeded");
  160                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
  161                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
  162                 return (1);
  163         }
  164         return (0);
  165 }
  166 
  167 /*
  168  * sctp_find_alternate_net() returns a non-NULL pointer as long
  169  * the argument net is non-NULL.
  170  */
  171 struct sctp_nets *
  172 sctp_find_alternate_net(struct sctp_tcb *stcb,
  173     struct sctp_nets *net,
  174     int mode)
  175 {
  176         /* Find and return an alternate network if possible */
  177         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
  178         int once;
  179 
  180         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
  181         int min_errors = -1;
  182         uint32_t max_cwnd = 0;
  183 
  184         if (stcb->asoc.numnets == 1) {
  185                 /* No others but net */
  186                 return (TAILQ_FIRST(&stcb->asoc.nets));
  187         }
  188         /*
  189          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
  190          * net algorithm. This algorithm chooses the active destination (not
  191          * in PF state) with the largest cwnd value. If all destinations are
  192          * in PF state, unreachable, or unconfirmed, choose the desination
  193          * that is in PF state with the lowest error count. In case of a
  194          * tie, choose the destination that was most recently active.
  195          */
  196         if (mode == 2) {
  197                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  198                         /*
  199                          * JRS 5/14/07 - If the destination is unreachable
  200                          * or unconfirmed, skip it.
  201                          */
  202                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  203                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  204                                 continue;
  205                         }
  206                         /*
  207                          * JRS 5/14/07 -  If the destination is reachable
  208                          * but in PF state, compare the error count of the
  209                          * destination to the minimum error count seen thus
  210                          * far. Store the destination with the lower error
  211                          * count.  If the error counts are equal, store the
  212                          * destination that was most recently active.
  213                          */
  214                         if (mnet->dest_state & SCTP_ADDR_PF) {
  215                                 /*
  216                                  * JRS 5/14/07 - If the destination under
  217                                  * consideration is the current destination,
  218                                  * work as if the error count is one higher.
  219                                  * The actual error count will not be
  220                                  * incremented until later in the t3
  221                                  * handler.
  222                                  */
  223                                 if (mnet == net) {
  224                                         if (min_errors == -1) {
  225                                                 min_errors = mnet->error_count + 1;
  226                                                 min_errors_net = mnet;
  227                                         } else if (mnet->error_count + 1 < min_errors) {
  228                                                 min_errors = mnet->error_count + 1;
  229                                                 min_errors_net = mnet;
  230                                         } else if (mnet->error_count + 1 == min_errors
  231                                             && mnet->last_active > min_errors_net->last_active) {
  232                                                 min_errors_net = mnet;
  233                                                 min_errors = mnet->error_count + 1;
  234                                         }
  235                                         continue;
  236                                 } else {
  237                                         if (min_errors == -1) {
  238                                                 min_errors = mnet->error_count;
  239                                                 min_errors_net = mnet;
  240                                         } else if (mnet->error_count < min_errors) {
  241                                                 min_errors = mnet->error_count;
  242                                                 min_errors_net = mnet;
  243                                         } else if (mnet->error_count == min_errors
  244                                             && mnet->last_active > min_errors_net->last_active) {
  245                                                 min_errors_net = mnet;
  246                                                 min_errors = mnet->error_count;
  247                                         }
  248                                         continue;
  249                                 }
  250                         }
  251                         /*
  252                          * JRS 5/14/07 - If the destination is reachable and
  253                          * not in PF state, compare the cwnd of the
  254                          * destination to the highest cwnd seen thus far.
  255                          * Store the destination with the higher cwnd value.
  256                          * If the cwnd values are equal, randomly choose one
  257                          * of the two destinations.
  258                          */
  259                         if (max_cwnd < mnet->cwnd) {
  260                                 max_cwnd_net = mnet;
  261                                 max_cwnd = mnet->cwnd;
  262                         } else if (max_cwnd == mnet->cwnd) {
  263                                 uint32_t rndval;
  264                                 uint8_t this_random;
  265 
  266                                 if (stcb->asoc.hb_random_idx > 3) {
  267                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  268                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
  269                                         this_random = stcb->asoc.hb_random_values[0];
  270                                         stcb->asoc.hb_random_idx++;
  271                                         stcb->asoc.hb_ect_randombit = 0;
  272                                 } else {
  273                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  274                                         stcb->asoc.hb_random_idx++;
  275                                         stcb->asoc.hb_ect_randombit = 0;
  276                                 }
  277                                 if (this_random % 2 == 1) {
  278                                         max_cwnd_net = mnet;
  279                                         max_cwnd = mnet->cwnd;  /* Useless? */
  280                                 }
  281                         }
  282                 }
  283                 if (max_cwnd_net == NULL) {
  284                         if (min_errors_net == NULL) {
  285                                 return (net);
  286                         }
  287                         return (min_errors_net);
  288                 } else {
  289                         return (max_cwnd_net);
  290                 }
  291         }                       /* JRS 5/14/07 - If mode is set to 1, use the
  292                                  * CMT policy for choosing an alternate net. */
  293         else if (mode == 1) {
  294                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  295                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  296                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  297                                 /*
  298                                  * will skip ones that are not-reachable or
  299                                  * unconfirmed
  300                                  */
  301                                 continue;
  302                         }
  303                         if (max_cwnd < mnet->cwnd) {
  304                                 max_cwnd_net = mnet;
  305                                 max_cwnd = mnet->cwnd;
  306                         } else if (max_cwnd == mnet->cwnd) {
  307                                 uint32_t rndval;
  308                                 uint8_t this_random;
  309 
  310                                 if (stcb->asoc.hb_random_idx > 3) {
  311                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  312                                         memcpy(stcb->asoc.hb_random_values, &rndval,
  313                                             sizeof(stcb->asoc.hb_random_values));
  314                                         this_random = stcb->asoc.hb_random_values[0];
  315                                         stcb->asoc.hb_random_idx = 0;
  316                                         stcb->asoc.hb_ect_randombit = 0;
  317                                 } else {
  318                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  319                                         stcb->asoc.hb_random_idx++;
  320                                         stcb->asoc.hb_ect_randombit = 0;
  321                                 }
  322                                 if (this_random % 2) {
  323                                         max_cwnd_net = mnet;
  324                                         max_cwnd = mnet->cwnd;
  325                                 }
  326                         }
  327                 }
  328                 if (max_cwnd_net) {
  329                         return (max_cwnd_net);
  330                 }
  331         }
  332         mnet = net;
  333         once = 0;
  334 
  335         if (mnet == NULL) {
  336                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
  337                 if (mnet == NULL) {
  338                         return (NULL);
  339                 }
  340         }
  341         for (;;) {
  342                 alt = TAILQ_NEXT(mnet, sctp_next);
  343                 if (alt == NULL) {
  344                         once++;
  345                         if (once > 1) {
  346                                 break;
  347                         }
  348                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  349                         if (alt == NULL) {
  350                                 return (NULL);
  351                         }
  352                 }
  353                 if (alt->ro.ro_rt == NULL) {
  354                         if (alt->ro._s_addr) {
  355                                 sctp_free_ifa(alt->ro._s_addr);
  356                                 alt->ro._s_addr = NULL;
  357                         }
  358                         alt->src_addr_selected = 0;
  359                 }
  360                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
  361                     (alt->ro.ro_rt != NULL) &&
  362                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
  363                         /* Found a reachable address */
  364                         break;
  365                 }
  366                 mnet = alt;
  367         }
  368 
  369         if (alt == NULL) {
  370                 /* Case where NO insv network exists (dormant state) */
  371                 /* we rotate destinations */
  372                 once = 0;
  373                 mnet = net;
  374                 for (;;) {
  375                         if (mnet == NULL) {
  376                                 return (TAILQ_FIRST(&stcb->asoc.nets));
  377                         }
  378                         alt = TAILQ_NEXT(mnet, sctp_next);
  379                         if (alt == NULL) {
  380                                 once++;
  381                                 if (once > 1) {
  382                                         break;
  383                                 }
  384                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
  385                                 if (alt == NULL) {
  386                                         break;
  387                                 }
  388                         }
  389                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  390                             (alt != net)) {
  391                                 /* Found an alternate address */
  392                                 break;
  393                         }
  394                         mnet = alt;
  395                 }
  396         }
  397         if (alt == NULL) {
  398                 return (net);
  399         }
  400         return (alt);
  401 }
  402 
  403 static void
  404 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
  405     struct sctp_nets *net,
  406     int win_probe,
  407     int num_marked, int num_abandoned)
  408 {
  409         if (net->RTO == 0) {
  410                 if (net->RTO_measured) {
  411                         net->RTO = stcb->asoc.minrto;
  412                 } else {
  413                         net->RTO = stcb->asoc.initial_rto;
  414                 }
  415         }
  416         net->RTO <<= 1;
  417         if (net->RTO > stcb->asoc.maxrto) {
  418                 net->RTO = stcb->asoc.maxrto;
  419         }
  420         if ((win_probe == 0) && (num_marked || num_abandoned)) {
  421                 /* We don't apply penalty to window probe scenarios */
  422                 /* JRS - Use the congestion control given in the CC module */
  423                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
  424         }
  425 }
  426 
  427 #ifndef INVARIANTS
  428 static void
  429 sctp_recover_sent_list(struct sctp_tcb *stcb)
  430 {
  431         struct sctp_tmit_chunk *chk, *nchk;
  432         struct sctp_association *asoc;
  433 
  434         asoc = &stcb->asoc;
  435         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  436                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
  437                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
  438                             (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
  439                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
  440                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
  441                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
  442                                 }
  443                         }
  444                         if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
  445                             (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
  446                             TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
  447                                 asoc->trigger_reset = 1;
  448                         }
  449                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  450                         if (PR_SCTP_ENABLED(chk->flags)) {
  451                                 if (asoc->pr_sctp_cnt != 0)
  452                                         asoc->pr_sctp_cnt--;
  453                         }
  454                         if (chk->data) {
  455                                 /* sa_ignore NO_NULL_CHK */
  456                                 sctp_free_bufspace(stcb, asoc, chk, 1);
  457                                 sctp_m_freem(chk->data);
  458                                 chk->data = NULL;
  459                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
  460                                         asoc->sent_queue_cnt_removeable--;
  461                                 }
  462                         }
  463                         asoc->sent_queue_cnt--;
  464                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  465                 }
  466         }
  467         SCTP_PRINTF("after recover order is as follows\n");
  468         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  469                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.tsn);
  470         }
  471 }
  472 #endif
  473 
  474 static int
  475 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
  476     struct sctp_nets *net,
  477     struct sctp_nets *alt,
  478     int window_probe,
  479     int *num_marked,
  480     int *num_abandoned)
  481 {
  482 
  483         /*
  484          * Mark all chunks (well not all) that were sent to *net for
  485          * retransmission. Move them to alt for there destination as well...
  486          * We only mark chunks that have been outstanding long enough to
  487          * have received feed-back.
  488          */
  489         struct sctp_tmit_chunk *chk, *nchk;
  490         struct sctp_nets *lnets;
  491         struct timeval now, min_wait, tv;
  492         int cur_rto;
  493         int cnt_abandoned;
  494         int audit_tf, num_mk, fir;
  495         unsigned int cnt_mk;
  496         uint32_t orig_flight, orig_tf;
  497         uint32_t tsnlast, tsnfirst;
  498         int recovery_cnt = 0;
  499 
  500 
  501         /* none in flight now */
  502         audit_tf = 0;
  503         fir = 0;
  504         /*
  505          * figure out how long a data chunk must be pending before we can
  506          * mark it ..
  507          */
  508         (void)SCTP_GETTIME_TIMEVAL(&now);
  509         /* get cur rto in micro-seconds */
  510         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
  511         cur_rto *= 1000;
  512         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  513                 sctp_log_fr(cur_rto,
  514                     stcb->asoc.peers_rwnd,
  515                     window_probe,
  516                     SCTP_FR_T3_MARK_TIME);
  517                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
  518                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
  519         }
  520         tv.tv_sec = cur_rto / 1000000;
  521         tv.tv_usec = cur_rto % 1000000;
  522         min_wait = now;
  523         timevalsub(&min_wait, &tv);
  524         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
  525                 /*
  526                  * if we hit here, we don't have enough seconds on the clock
  527                  * to account for the RTO. We just let the lower seconds be
  528                  * the bounds and don't worry about it. This may mean we
  529                  * will mark a lot more than we should.
  530                  */
  531                 min_wait.tv_sec = min_wait.tv_usec = 0;
  532         }
  533         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  534                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
  535                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
  536         }
  537         /*
  538          * Our rwnd will be incorrect here since we are not adding back the
  539          * cnt * mbuf but we will fix that down below.
  540          */
  541         orig_flight = net->flight_size;
  542         orig_tf = stcb->asoc.total_flight;
  543 
  544         net->fast_retran_ip = 0;
  545         /* Now on to each chunk */
  546         cnt_abandoned = 0;
  547         num_mk = cnt_mk = 0;
  548         tsnfirst = tsnlast = 0;
  549 #ifndef INVARIANTS
  550 start_again:
  551 #endif
  552         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
  553                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
  554                         /* Strange case our list got out of order? */
  555                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
  556                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
  557                         recovery_cnt++;
  558 #ifdef INVARIANTS
  559                         panic("last acked >= chk on sent-Q");
  560 #else
  561                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
  562                         sctp_recover_sent_list(stcb);
  563                         if (recovery_cnt < 10) {
  564                                 goto start_again;
  565                         } else {
  566                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
  567                         }
  568 #endif
  569                 }
  570                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
  571                         /*
  572                          * found one to mark: If it is less than
  573                          * DATAGRAM_ACKED it MUST not be a skipped or marked
  574                          * TSN but instead one that is either already set
  575                          * for retransmission OR one that needs
  576                          * retransmission.
  577                          */
  578 
  579                         /* validate its been outstanding long enough */
  580                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  581                                 sctp_log_fr(chk->rec.data.tsn,
  582                                     chk->sent_rcv_time.tv_sec,
  583                                     chk->sent_rcv_time.tv_usec,
  584                                     SCTP_FR_T3_MARK_TIME);
  585                         }
  586                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
  587                                 /*
  588                                  * we have reached a chunk that was sent
  589                                  * some seconds past our min.. forget it we
  590                                  * will find no more to send.
  591                                  */
  592                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  593                                         sctp_log_fr(0,
  594                                             chk->sent_rcv_time.tv_sec,
  595                                             chk->sent_rcv_time.tv_usec,
  596                                             SCTP_FR_T3_STOPPED);
  597                                 }
  598                                 continue;
  599                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
  600                             (window_probe == 0)) {
  601                                 /*
  602                                  * we must look at the micro seconds to
  603                                  * know.
  604                                  */
  605                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
  606                                         /*
  607                                          * ok it was sent after our boundary
  608                                          * time.
  609                                          */
  610                                         continue;
  611                                 }
  612                         }
  613                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
  614                                 /* Is it expired? */
  615                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
  616                                         /* Yes so drop it */
  617                                         if (chk->data) {
  618                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  619                                                     chk,
  620                                                     1,
  621                                                     SCTP_SO_NOT_LOCKED);
  622                                                 cnt_abandoned++;
  623                                         }
  624                                         continue;
  625                                 }
  626                         }
  627                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
  628                                 /* Has it been retransmitted tv_sec times? */
  629                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
  630                                         if (chk->data) {
  631                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  632                                                     chk,
  633                                                     1,
  634                                                     SCTP_SO_NOT_LOCKED);
  635                                                 cnt_abandoned++;
  636                                         }
  637                                         continue;
  638                                 }
  639                         }
  640                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  641                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  642                                 num_mk++;
  643                                 if (fir == 0) {
  644                                         fir = 1;
  645                                         tsnfirst = chk->rec.data.tsn;
  646                                 }
  647                                 tsnlast = chk->rec.data.tsn;
  648                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  649                                         sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
  650                                             0, SCTP_FR_T3_MARKED);
  651                                 }
  652 
  653                                 if (chk->rec.data.chunk_was_revoked) {
  654                                         /* deflate the cwnd */
  655                                         chk->whoTo->cwnd -= chk->book_size;
  656                                         chk->rec.data.chunk_was_revoked = 0;
  657                                 }
  658                                 net->marked_retrans++;
  659                                 stcb->asoc.marked_retrans++;
  660                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  661                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  662                                             chk->whoTo->flight_size,
  663                                             chk->book_size,
  664                                             (uint32_t)(uintptr_t)chk->whoTo,
  665                                             chk->rec.data.tsn);
  666                                 }
  667                                 sctp_flight_size_decrease(chk);
  668                                 sctp_total_flight_decrease(stcb, chk);
  669                                 stcb->asoc.peers_rwnd += chk->send_size;
  670                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  671                         }
  672                         chk->sent = SCTP_DATAGRAM_RESEND;
  673                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  674                         SCTP_STAT_INCR(sctps_markedretrans);
  675 
  676                         /* reset the TSN for striking and other FR stuff */
  677                         chk->rec.data.doing_fast_retransmit = 0;
  678                         /* Clear any time so NO RTT is being done */
  679 
  680                         if (chk->do_rtt) {
  681                                 if (chk->whoTo->rto_needed == 0) {
  682                                         chk->whoTo->rto_needed = 1;
  683                                 }
  684                         }
  685                         chk->do_rtt = 0;
  686                         if (alt != net) {
  687                                 sctp_free_remote_addr(chk->whoTo);
  688                                 chk->no_fr_allowed = 1;
  689                                 chk->whoTo = alt;
  690                                 atomic_add_int(&alt->ref_count, 1);
  691                         } else {
  692                                 chk->no_fr_allowed = 0;
  693                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  694                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  695                                 } else {
  696                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
  697                                 }
  698                         }
  699                         /*
  700                          * CMT: Do not allow FRs on retransmitted TSNs.
  701                          */
  702                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  703                                 chk->no_fr_allowed = 1;
  704                         }
  705 #ifdef THIS_SHOULD_NOT_BE_DONE
  706                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  707                         /* remember highest acked one */
  708                         could_be_sent = chk;
  709 #endif
  710                 }
  711                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  712                         cnt_mk++;
  713                 }
  714         }
  715         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  716                 /* we did not subtract the same things? */
  717                 audit_tf = 1;
  718         }
  719 
  720         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  721                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  722         }
  723 #ifdef SCTP_DEBUG
  724         if (num_mk) {
  725                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  726                     tsnlast);
  727                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
  728                     num_mk,
  729                     stcb->asoc.peers_rwnd);
  730         }
  731 #endif
  732         *num_marked = num_mk;
  733         *num_abandoned = cnt_abandoned;
  734         /*
  735          * Now check for a ECN Echo that may be stranded And include the
  736          * cnt_mk'd to have all resends in the control queue.
  737          */
  738         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  739                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  740                         cnt_mk++;
  741                 }
  742                 if ((chk->whoTo == net) &&
  743                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  744                         sctp_free_remote_addr(chk->whoTo);
  745                         chk->whoTo = alt;
  746                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  747                                 chk->sent = SCTP_DATAGRAM_RESEND;
  748                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  749                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  750                                 cnt_mk++;
  751                         }
  752                         atomic_add_int(&alt->ref_count, 1);
  753                 }
  754         }
  755 #ifdef THIS_SHOULD_NOT_BE_DONE
  756         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  757                 /* fix it so we retransmit the highest acked anyway */
  758                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  759                 cnt_mk++;
  760                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  761         }
  762 #endif
  763         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  764 #ifdef INVARIANTS
  765                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  766                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  767 #endif
  768 #ifndef SCTP_AUDITING_ENABLED
  769                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  770 #endif
  771         }
  772         if (audit_tf) {
  773                 SCTPDBG(SCTP_DEBUG_TIMER4,
  774                     "Audit total flight due to negative value net:%p\n",
  775                     (void *)net);
  776                 stcb->asoc.total_flight = 0;
  777                 stcb->asoc.total_flight_count = 0;
  778                 /* Clear all networks flight size */
  779                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  780                         lnets->flight_size = 0;
  781                         SCTPDBG(SCTP_DEBUG_TIMER4,
  782                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  783                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
  784                 }
  785                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  786                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  787                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  788                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  789                                             chk->whoTo->flight_size,
  790                                             chk->book_size,
  791                                             (uint32_t)(uintptr_t)chk->whoTo,
  792                                             chk->rec.data.tsn);
  793                                 }
  794 
  795                                 sctp_flight_size_increase(chk);
  796                                 sctp_total_flight_increase(stcb, chk);
  797                         }
  798                 }
  799         }
  800         /* We return 1 if we only have a window probe outstanding */
  801         return (0);
  802 }
  803 
  804 
  805 int
  806 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  807     struct sctp_tcb *stcb,
  808     struct sctp_nets *net)
  809 {
  810         struct sctp_nets *alt;
  811         int win_probe, num_mk, num_abandoned;
  812 
  813         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  814                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  815         }
  816         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  817                 struct sctp_nets *lnet;
  818 
  819                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  820                         if (net == lnet) {
  821                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  822                         } else {
  823                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  824                         }
  825                 }
  826         }
  827         /* Find an alternate and mark those for retransmission */
  828         if ((stcb->asoc.peers_rwnd == 0) &&
  829             (stcb->asoc.total_flight < net->mtu)) {
  830                 SCTP_STAT_INCR(sctps_timowindowprobe);
  831                 win_probe = 1;
  832         } else {
  833                 win_probe = 0;
  834         }
  835 
  836         if (win_probe == 0) {
  837                 /* We don't do normal threshold management on window probes */
  838                 if (sctp_threshold_management(inp, stcb, net,
  839                     stcb->asoc.max_send_times)) {
  840                         /* Association was destroyed */
  841                         return (1);
  842                 } else {
  843                         if (net != stcb->asoc.primary_destination) {
  844                                 /* send a immediate HB if our RTO is stale */
  845                                 struct timeval now;
  846                                 unsigned int ms_goneby;
  847 
  848                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  849                                 if (net->last_sent_time.tv_sec) {
  850                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  851                                 } else {
  852                                         ms_goneby = 0;
  853                                 }
  854                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  855                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  856                                                 /*
  857                                                  * no recent feed back in an
  858                                                  * RTO or more, request a
  859                                                  * RTT update
  860                                                  */
  861                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  862                                         }
  863                                 }
  864                         }
  865                 }
  866         } else {
  867                 /*
  868                  * For a window probe we don't penalize the net's but only
  869                  * the association. This may fail it if SACKs are not coming
  870                  * back. If sack's are coming with rwnd locked at 0, we will
  871                  * continue to hold things waiting for rwnd to raise
  872                  */
  873                 if (sctp_threshold_management(inp, stcb, NULL,
  874                     stcb->asoc.max_send_times)) {
  875                         /* Association was destroyed */
  876                         return (1);
  877                 }
  878         }
  879         if (stcb->asoc.sctp_cmt_on_off > 0) {
  880                 if (net->pf_threshold < net->failure_threshold) {
  881                         alt = sctp_find_alternate_net(stcb, net, 2);
  882                 } else {
  883                         /*
  884                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  885                          * being used, then pick dest with largest ssthresh
  886                          * for any retransmission.
  887                          */
  888                         alt = sctp_find_alternate_net(stcb, net, 1);
  889                         /*
  890                          * CUCv2: If a different dest is picked for the
  891                          * retransmission, then new (rtx-)pseudo_cumack
  892                          * needs to be tracked for orig dest. Let CUCv2
  893                          * track new (rtx-) pseudo-cumack always.
  894                          */
  895                         net->find_pseudo_cumack = 1;
  896                         net->find_rtx_pseudo_cumack = 1;
  897                 }
  898         } else {
  899                 alt = sctp_find_alternate_net(stcb, net, 0);
  900         }
  901 
  902         num_mk = 0;
  903         num_abandoned = 0;
  904         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  905             &num_mk, &num_abandoned);
  906         /* FR Loss recovery just ended with the T3. */
  907         stcb->asoc.fast_retran_loss_recovery = 0;
  908 
  909         /* CMT FR loss recovery ended with the T3 */
  910         net->fast_retran_loss_recovery = 0;
  911         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  912             (net->flight_size == 0)) {
  913                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  914         }
  915 
  916         /*
  917          * setup the sat loss recovery that prevents satellite cwnd advance.
  918          */
  919         stcb->asoc.sat_t3_loss_recovery = 1;
  920         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  921 
  922         /* Backoff the timer and cwnd */
  923         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  924         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  925             (net->dest_state & SCTP_ADDR_PF)) {
  926                 /* Move all pending over too */
  927                 sctp_move_chunks_from_net(stcb, net);
  928 
  929                 /*
  930                  * Get the address that failed, to force a new src address
  931                  * selecton and a route allocation.
  932                  */
  933                 if (net->ro._s_addr) {
  934                         sctp_free_ifa(net->ro._s_addr);
  935                         net->ro._s_addr = NULL;
  936                 }
  937                 net->src_addr_selected = 0;
  938 
  939                 /* Force a route allocation too */
  940                 if (net->ro.ro_rt) {
  941                         RTFREE(net->ro.ro_rt);
  942                         net->ro.ro_rt = NULL;
  943                 }
  944 
  945                 /* Was it our primary? */
  946                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  947                         /*
  948                          * Yes, note it as such and find an alternate note:
  949                          * this means HB code must use this to resent the
  950                          * primary if it goes active AND if someone does a
  951                          * change-primary then this flag must be cleared
  952                          * from any net structures.
  953                          */
  954                         if (stcb->asoc.alternate) {
  955                                 sctp_free_remote_addr(stcb->asoc.alternate);
  956                         }
  957                         stcb->asoc.alternate = alt;
  958                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  959                 }
  960         }
  961         /*
  962          * Special case for cookie-echo'ed case, we don't do output but must
  963          * await the COOKIE-ACK before retransmission
  964          */
  965         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
  966                 /*
  967                  * Here we just reset the timer and start again since we
  968                  * have not established the asoc
  969                  */
  970                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  971                 return (0);
  972         }
  973         if (stcb->asoc.prsctp_supported) {
  974                 struct sctp_tmit_chunk *lchk;
  975 
  976                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  977                 /* C3. See if we need to send a Fwd-TSN */
  978                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  979                         send_forward_tsn(stcb, &stcb->asoc);
  980                         if (lchk) {
  981                                 /* Assure a timer is up */
  982                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  983                         }
  984                 }
  985         }
  986         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  987                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  988         }
  989         return (0);
  990 }
  991 
  992 int
  993 sctp_t1init_timer(struct sctp_inpcb *inp,
  994     struct sctp_tcb *stcb,
  995     struct sctp_nets *net)
  996 {
  997         /* bump the thresholds */
  998         if (stcb->asoc.delayed_connection) {
  999                 /*
 1000                  * special hook for delayed connection. The library did NOT
 1001                  * complete the rest of its sends.
 1002                  */
 1003                 stcb->asoc.delayed_connection = 0;
 1004                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1005                 return (0);
 1006         }
 1007         if (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT) {
 1008                 return (0);
 1009         }
 1010         if (sctp_threshold_management(inp, stcb, net,
 1011             stcb->asoc.max_init_times)) {
 1012                 /* Association was destroyed */
 1013                 return (1);
 1014         }
 1015         stcb->asoc.dropped_special_cnt = 0;
 1016         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1017         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1018                 net->RTO = stcb->asoc.initial_init_rto_max;
 1019         }
 1020         if (stcb->asoc.numnets > 1) {
 1021                 /* If we have more than one addr use it */
 1022                 struct sctp_nets *alt;
 1023 
 1024                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1025                 if (alt != stcb->asoc.primary_destination) {
 1026                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1027                         stcb->asoc.primary_destination = alt;
 1028                 }
 1029         }
 1030         /* Send out a new init */
 1031         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1032         return (0);
 1033 }
 1034 
 1035 /*
 1036  * For cookie and asconf we actually need to find and mark for resend, then
 1037  * increment the resend counter (after all the threshold management stuff of
 1038  * course).
 1039  */
 1040 int
 1041 sctp_cookie_timer(struct sctp_inpcb *inp,
 1042     struct sctp_tcb *stcb,
 1043     struct sctp_nets *net SCTP_UNUSED)
 1044 {
 1045         struct sctp_nets *alt;
 1046         struct sctp_tmit_chunk *cookie;
 1047 
 1048         /* first before all else we must find the cookie */
 1049         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1050                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1051                         break;
 1052                 }
 1053         }
 1054         if (cookie == NULL) {
 1055                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 1056                         /* FOOBAR! */
 1057                         struct mbuf *op_err;
 1058 
 1059                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 1060                             "Cookie timer expired, but no cookie");
 1061                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
 1062                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 1063                 } else {
 1064 #ifdef INVARIANTS
 1065                         panic("Cookie timer expires in wrong state?");
 1066 #else
 1067                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(stcb));
 1068                         return (0);
 1069 #endif
 1070                 }
 1071                 return (0);
 1072         }
 1073         /* Ok we found the cookie, threshold management next */
 1074         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1075             stcb->asoc.max_init_times)) {
 1076                 /* Assoc is over */
 1077                 return (1);
 1078         }
 1079         /*
 1080          * Cleared threshold management, now lets backoff the address and
 1081          * select an alternate
 1082          */
 1083         stcb->asoc.dropped_special_cnt = 0;
 1084         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1085         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1086         if (alt != cookie->whoTo) {
 1087                 sctp_free_remote_addr(cookie->whoTo);
 1088                 cookie->whoTo = alt;
 1089                 atomic_add_int(&alt->ref_count, 1);
 1090         }
 1091         /* Now mark the retran info */
 1092         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1093                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1094         }
 1095         cookie->sent = SCTP_DATAGRAM_RESEND;
 1096         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1097         /*
 1098          * Now call the output routine to kick out the cookie again, Note we
 1099          * don't mark any chunks for retran so that FR will need to kick in
 1100          * to move these (or a send timer).
 1101          */
 1102         return (0);
 1103 }
 1104 
 1105 int
 1106 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1107     struct sctp_nets *net)
 1108 {
 1109         struct sctp_nets *alt;
 1110         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1111 
 1112         if (stcb->asoc.stream_reset_outstanding == 0) {
 1113                 return (0);
 1114         }
 1115         /* find the existing STRRESET, we use the seq number we sent out on */
 1116         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1117         if (strrst == NULL) {
 1118                 return (0);
 1119         }
 1120         /* do threshold management */
 1121         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
 1122             stcb->asoc.max_send_times)) {
 1123                 /* Assoc is over */
 1124                 return (1);
 1125         }
 1126         /*
 1127          * Cleared threshold management, now lets backoff the address and
 1128          * select an alternate
 1129          */
 1130         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
 1131         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
 1132         sctp_free_remote_addr(strrst->whoTo);
 1133         strrst->whoTo = alt;
 1134         atomic_add_int(&alt->ref_count, 1);
 1135 
 1136         /* See if a ECN Echo is also stranded */
 1137         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1138                 if ((chk->whoTo == net) &&
 1139                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1140                         sctp_free_remote_addr(chk->whoTo);
 1141                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1142                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1143                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1144                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1145                         }
 1146                         chk->whoTo = alt;
 1147                         atomic_add_int(&alt->ref_count, 1);
 1148                 }
 1149         }
 1150         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1151                 /*
 1152                  * If the address went un-reachable, we need to move to
 1153                  * alternates for ALL chk's in queue
 1154                  */
 1155                 sctp_move_chunks_from_net(stcb, net);
 1156         }
 1157         /* mark the retran info */
 1158         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1159                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1160         strrst->sent = SCTP_DATAGRAM_RESEND;
 1161         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1162 
 1163         /* restart the timer */
 1164         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 1165         return (0);
 1166 }
 1167 
 1168 int
 1169 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1170     struct sctp_nets *net)
 1171 {
 1172         struct sctp_nets *alt;
 1173         struct sctp_tmit_chunk *asconf, *chk;
 1174 
 1175         /* is this a first send, or a retransmission? */
 1176         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1177                 /* compose a new ASCONF chunk and send it */
 1178                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1179         } else {
 1180                 /*
 1181                  * Retransmission of the existing ASCONF is needed
 1182                  */
 1183 
 1184                 /* find the existing ASCONF */
 1185                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1186                 if (asconf == NULL) {
 1187                         return (0);
 1188                 }
 1189                 /* do threshold management */
 1190                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 1191                     stcb->asoc.max_send_times)) {
 1192                         /* Assoc is over */
 1193                         return (1);
 1194                 }
 1195                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1196                         /*
 1197                          * Something is rotten: our peer is not responding
 1198                          * to ASCONFs but apparently is to other chunks.
 1199                          * i.e. it is not properly handling the chunk type
 1200                          * upper bits. Mark this peer as ASCONF incapable
 1201                          * and cleanup.
 1202                          */
 1203                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1204                         sctp_asconf_cleanup(stcb, net);
 1205                         return (0);
 1206                 }
 1207                 /*
 1208                  * cleared threshold management, so now backoff the net and
 1209                  * select an alternate
 1210                  */
 1211                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 1212                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 1213                 if (asconf->whoTo != alt) {
 1214                         sctp_free_remote_addr(asconf->whoTo);
 1215                         asconf->whoTo = alt;
 1216                         atomic_add_int(&alt->ref_count, 1);
 1217                 }
 1218 
 1219                 /* See if an ECN Echo is also stranded */
 1220                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1221                         if ((chk->whoTo == net) &&
 1222                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1223                                 sctp_free_remote_addr(chk->whoTo);
 1224                                 chk->whoTo = alt;
 1225                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1226                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1227                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1228                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1229                                 }
 1230                                 atomic_add_int(&alt->ref_count, 1);
 1231                         }
 1232                 }
 1233                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1234                         if (chk->whoTo != alt) {
 1235                                 sctp_free_remote_addr(chk->whoTo);
 1236                                 chk->whoTo = alt;
 1237                                 atomic_add_int(&alt->ref_count, 1);
 1238                         }
 1239                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1240                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1241                         chk->sent = SCTP_DATAGRAM_RESEND;
 1242                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1243                 }
 1244                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1245                         /*
 1246                          * If the address went un-reachable, we need to move
 1247                          * to the alternate for ALL chunks in queue
 1248                          */
 1249                         sctp_move_chunks_from_net(stcb, net);
 1250                 }
 1251                 /* mark the retran info */
 1252                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1253                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1254                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1255                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1256 
 1257                 /* send another ASCONF if any and we can do */
 1258                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1259         }
 1260         return (0);
 1261 }
 1262 
 1263 /* Mobility adaptation */
 1264 void
 1265 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1266     struct sctp_nets *net SCTP_UNUSED)
 1267 {
 1268         if (stcb->asoc.deleted_primary == NULL) {
 1269                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1270                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1271                 return;
 1272         }
 1273         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1274         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1275         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1276         stcb->asoc.deleted_primary = NULL;
 1277         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1278         return;
 1279 }
 1280 
 1281 /*
 1282  * For the shutdown and shutdown-ack, we do not keep one around on the
 1283  * control queue. This means we must generate a new one and call the general
 1284  * chunk output routine, AFTER having done threshold management.
 1285  * It is assumed that net is non-NULL.
 1286  */
 1287 int
 1288 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1289     struct sctp_nets *net)
 1290 {
 1291         struct sctp_nets *alt;
 1292 
 1293         /* first threshold management */
 1294         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1295                 /* Assoc is over */
 1296                 return (1);
 1297         }
 1298         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1299         /* second select an alternative */
 1300         alt = sctp_find_alternate_net(stcb, net, 0);
 1301 
 1302         /* third generate a shutdown into the queue for out net */
 1303         sctp_send_shutdown(stcb, alt);
 1304 
 1305         /* fourth restart timer */
 1306         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1307         return (0);
 1308 }
 1309 
 1310 int
 1311 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1312     struct sctp_nets *net)
 1313 {
 1314         struct sctp_nets *alt;
 1315 
 1316         /* first threshold management */
 1317         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1318                 /* Assoc is over */
 1319                 return (1);
 1320         }
 1321         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1322         /* second select an alternative */
 1323         alt = sctp_find_alternate_net(stcb, net, 0);
 1324 
 1325         /* third generate a shutdown into the queue for out net */
 1326         sctp_send_shutdown_ack(stcb, alt);
 1327 
 1328         /* fourth restart timer */
 1329         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1330         return (0);
 1331 }
 1332 
 1333 static void
 1334 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1335     struct sctp_tcb *stcb)
 1336 {
 1337         struct sctp_stream_queue_pending *sp;
 1338         unsigned int i, chks_in_queue = 0;
 1339         int being_filled = 0;
 1340 
 1341         /*
 1342          * This function is ONLY called when the send/sent queues are empty.
 1343          */
 1344         if ((stcb == NULL) || (inp == NULL))
 1345                 return;
 1346 
 1347         if (stcb->asoc.sent_queue_retran_cnt) {
 1348                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1349                     stcb->asoc.sent_queue_retran_cnt);
 1350                 stcb->asoc.sent_queue_retran_cnt = 0;
 1351         }
 1352         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1353                 /* No stream scheduler information, initialize scheduler */
 1354                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1355                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1356                         /* yep, we lost a stream or two */
 1357                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1358                 } else {
 1359                         /* no streams lost */
 1360                         stcb->asoc.total_output_queue_size = 0;
 1361                 }
 1362         }
 1363         /* Check to see if some data queued, if so report it */
 1364         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1365                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1366                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1367                                 if (sp->msg_is_complete)
 1368                                         being_filled++;
 1369                                 chks_in_queue++;
 1370                         }
 1371                 }
 1372         }
 1373         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1374                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1375                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1376         }
 1377         if (chks_in_queue) {
 1378                 /* call the output queue function */
 1379                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1380                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1381                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1382                         /*
 1383                          * Probably should go in and make it go back through
 1384                          * and add fragments allowed
 1385                          */
 1386                         if (being_filled == 0) {
 1387                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1388                                     chks_in_queue);
 1389                         }
 1390                 }
 1391         } else {
 1392                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1393                     (u_long)stcb->asoc.total_output_queue_size);
 1394                 stcb->asoc.total_output_queue_size = 0;
 1395         }
 1396 }
 1397 
 1398 int
 1399 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1400     struct sctp_nets *net)
 1401 {
 1402         uint8_t net_was_pf;
 1403 
 1404         if (net->dest_state & SCTP_ADDR_PF) {
 1405                 net_was_pf = 1;
 1406         } else {
 1407                 net_was_pf = 0;
 1408         }
 1409         if (net->hb_responded == 0) {
 1410                 if (net->ro._s_addr) {
 1411                         /*
 1412                          * Invalidate the src address if we did not get a
 1413                          * response last time.
 1414                          */
 1415                         sctp_free_ifa(net->ro._s_addr);
 1416                         net->ro._s_addr = NULL;
 1417                         net->src_addr_selected = 0;
 1418                 }
 1419                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1420                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1421                         /* Assoc is over */
 1422                         return (1);
 1423                 }
 1424         }
 1425         /* Zero PBA, if it needs it */
 1426         if (net->partial_bytes_acked) {
 1427                 net->partial_bytes_acked = 0;
 1428         }
 1429         if ((stcb->asoc.total_output_queue_size > 0) &&
 1430             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1431             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1432                 sctp_audit_stream_queues_for_size(inp, stcb);
 1433         }
 1434         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1435             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1436                 /*
 1437                  * when move to PF during threshold mangement, a HB has been
 1438                  * queued in that routine
 1439                  */
 1440                 uint32_t ms_gone_by;
 1441 
 1442                 if ((net->last_sent_time.tv_sec > 0) ||
 1443                     (net->last_sent_time.tv_usec > 0)) {
 1444                         struct timeval diff;
 1445 
 1446                         SCTP_GETTIME_TIMEVAL(&diff);
 1447                         timevalsub(&diff, &net->last_sent_time);
 1448                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
 1449                             (uint32_t)(diff.tv_usec / 1000);
 1450                 } else {
 1451                         ms_gone_by = 0xffffffff;
 1452                 }
 1453                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1454                     (net->dest_state & SCTP_ADDR_PF)) {
 1455                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1456                 }
 1457         }
 1458         return (0);
 1459 }
 1460 
 1461 void
 1462 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1463     struct sctp_tcb *stcb,
 1464     struct sctp_nets *net)
 1465 {
 1466         uint32_t next_mtu, mtu;
 1467 
 1468         next_mtu = sctp_get_next_mtu(net->mtu);
 1469 
 1470         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1471                 if ((net->src_addr_selected == 0) ||
 1472                     (net->ro._s_addr == NULL) ||
 1473                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1474                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1475                                 sctp_free_ifa(net->ro._s_addr);
 1476                                 net->ro._s_addr = NULL;
 1477                                 net->src_addr_selected = 0;
 1478                         } else if (net->ro._s_addr == NULL) {
 1479 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1480                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1481                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1482 
 1483                                         /* KAME hack: embed scopeid */
 1484                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1485                                 }
 1486 #endif
 1487 
 1488                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1489                                     stcb,
 1490                                     (sctp_route_t *)&net->ro,
 1491                                     net, 0, stcb->asoc.vrf_id);
 1492 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1493                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1494                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1495 
 1496                                         (void)sa6_recoverscope(sin6);
 1497                                 }
 1498 #endif                          /* INET6 */
 1499                         }
 1500                         if (net->ro._s_addr)
 1501                                 net->src_addr_selected = 1;
 1502                 }
 1503                 if (net->ro._s_addr) {
 1504                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1505 #if defined(INET) || defined(INET6)
 1506                         if (net->port) {
 1507                                 mtu -= sizeof(struct udphdr);
 1508                         }
 1509 #endif
 1510                         if (mtu > next_mtu) {
 1511                                 net->mtu = next_mtu;
 1512                         } else {
 1513                                 net->mtu = mtu;
 1514                         }
 1515                 }
 1516         }
 1517         /* restart the timer */
 1518         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1519 }
 1520 
 1521 void
 1522 sctp_autoclose_timer(struct sctp_inpcb *inp,
 1523     struct sctp_tcb *stcb,
 1524     struct sctp_nets *net)
 1525 {
 1526         struct timeval tn, *tim_touse;
 1527         struct sctp_association *asoc;
 1528         int ticks_gone_by;
 1529 
 1530         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1531         if (stcb->asoc.sctp_autoclose_ticks &&
 1532             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1533                 /* Auto close is on */
 1534                 asoc = &stcb->asoc;
 1535                 /* pick the time to use */
 1536                 if (asoc->time_last_rcvd.tv_sec >
 1537                     asoc->time_last_sent.tv_sec) {
 1538                         tim_touse = &asoc->time_last_rcvd;
 1539                 } else {
 1540                         tim_touse = &asoc->time_last_sent;
 1541                 }
 1542                 /* Now has long enough transpired to autoclose? */
 1543                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 1544                 if ((ticks_gone_by > 0) &&
 1545                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
 1546                         /*
 1547                          * autoclose time has hit, call the output routine,
 1548                          * which should do nothing just to be SURE we don't
 1549                          * have hanging data. We can then safely check the
 1550                          * queues and know that we are clear to send
 1551                          * shutdown
 1552                          */
 1553                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1554                         /* Are we clean? */
 1555                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1556                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1557                                 /*
 1558                                  * there is nothing queued to send, so I'm
 1559                                  * done...
 1560                                  */
 1561                                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
 1562                                         /* only send SHUTDOWN 1st time thru */
 1563                                         struct sctp_nets *netp;
 1564 
 1565                                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 1566                                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1567                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1568                                         }
 1569                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
 1570                                         sctp_stop_timers_for_shutdown(stcb);
 1571                                         if (stcb->asoc.alternate) {
 1572                                                 netp = stcb->asoc.alternate;
 1573                                         } else {
 1574                                                 netp = stcb->asoc.primary_destination;
 1575                                         }
 1576                                         sctp_send_shutdown(stcb, netp);
 1577                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1578                                             stcb->sctp_ep, stcb,
 1579                                             netp);
 1580                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1581                                             stcb->sctp_ep, stcb,
 1582                                             netp);
 1583                                 }
 1584                         }
 1585                 } else {
 1586                         /*
 1587                          * No auto close at this time, reset t-o to check
 1588                          * later
 1589                          */
 1590                         int tmp;
 1591 
 1592                         /* fool the timer startup to use the time left */
 1593                         tmp = asoc->sctp_autoclose_ticks;
 1594                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1595                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1596                             net);
 1597                         /* restore the real tick value */
 1598                         asoc->sctp_autoclose_ticks = tmp;
 1599                 }
 1600         }
 1601 }

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