The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_timer.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/9.1/sys/netinet/sctp_timer.c 237896 2012-07-01 07:59:00Z tuexen $");
   35 
   36 #define _IP_VHL
   37 #include <netinet/sctp_os.h>
   38 #include <netinet/sctp_pcb.h>
   39 #ifdef INET6
   40 #endif
   41 #include <netinet/sctp_var.h>
   42 #include <netinet/sctp_sysctl.h>
   43 #include <netinet/sctp_timer.h>
   44 #include <netinet/sctputil.h>
   45 #include <netinet/sctp_output.h>
   46 #include <netinet/sctp_header.h>
   47 #include <netinet/sctp_indata.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctp_input.h>
   50 #include <netinet/sctp.h>
   51 #include <netinet/sctp_uio.h>
   52 #include <netinet/udp.h>
   53 
   54 
   55 void
   56 sctp_audit_retranmission_queue(struct sctp_association *asoc)
   57 {
   58         struct sctp_tmit_chunk *chk;
   59 
   60         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
   61             asoc->sent_queue_retran_cnt,
   62             asoc->sent_queue_cnt);
   63         asoc->sent_queue_retran_cnt = 0;
   64         asoc->sent_queue_cnt = 0;
   65         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
   66                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   67                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   68                 }
   69                 asoc->sent_queue_cnt++;
   70         }
   71         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
   72                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   73                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   74                 }
   75         }
   76         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
   77                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   78                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   79                 }
   80         }
   81         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
   82             asoc->sent_queue_retran_cnt,
   83             asoc->sent_queue_cnt);
   84 }
   85 
   86 int
   87 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   88     struct sctp_nets *net, uint16_t threshold)
   89 {
   90         if (net) {
   91                 net->error_count++;
   92                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
   93                     net, net->error_count,
   94                     net->failure_threshold);
   95                 if (net->error_count > net->failure_threshold) {
   96                         /* We had a threshold failure */
   97                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
   98                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
   99                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  100                                 net->dest_state &= ~SCTP_ADDR_PF;
  101                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  102                                     stcb, 0,
  103                                     (void *)net, SCTP_SO_NOT_LOCKED);
  104                         }
  105                 } else if ((net->pf_threshold < net->failure_threshold) &&
  106                     (net->error_count > net->pf_threshold)) {
  107                         if (!(net->dest_state & SCTP_ADDR_PF)) {
  108                                 net->dest_state |= SCTP_ADDR_PF;
  109                                 net->last_active = sctp_get_tick_count();
  110                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  111                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
  112                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
  113                         }
  114                 }
  115         }
  116         if (stcb == NULL)
  117                 return (0);
  118 
  119         if (net) {
  120                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
  121                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  122                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
  123                                     stcb->asoc.overall_error_count,
  124                                     (stcb->asoc.overall_error_count + 1),
  125                                     SCTP_FROM_SCTP_TIMER,
  126                                     __LINE__);
  127                         }
  128                         stcb->asoc.overall_error_count++;
  129                 }
  130         } else {
  131                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  132                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
  133                             stcb->asoc.overall_error_count,
  134                             (stcb->asoc.overall_error_count + 1),
  135                             SCTP_FROM_SCTP_TIMER,
  136                             __LINE__);
  137                 }
  138                 stcb->asoc.overall_error_count++;
  139         }
  140         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
  141             &stcb->asoc, stcb->asoc.overall_error_count,
  142             (uint32_t) threshold,
  143             ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
  144         /*
  145          * We specifically do not do >= to give the assoc one more change
  146          * before we fail it.
  147          */
  148         if (stcb->asoc.overall_error_count > threshold) {
  149                 /* Abort notification sends a ULP notify */
  150                 struct mbuf *oper;
  151 
  152                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
  153                     0, M_DONTWAIT, 1, MT_DATA);
  154                 if (oper) {
  155                         struct sctp_paramhdr *ph;
  156                         uint32_t *ippp;
  157 
  158                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
  159                             sizeof(uint32_t);
  160                         ph = mtod(oper, struct sctp_paramhdr *);
  161                         ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
  162                         ph->param_length = htons(SCTP_BUF_LEN(oper));
  163                         ippp = (uint32_t *) (ph + 1);
  164                         *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
  165                 }
  166                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_1;
  167                 sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
  168                 return (1);
  169         }
  170         return (0);
  171 }
  172 
  173 /*
  174  * sctp_find_alternate_net() returns a non-NULL pointer as long
  175  * the argument net is non-NULL.
  176  */
  177 struct sctp_nets *
  178 sctp_find_alternate_net(struct sctp_tcb *stcb,
  179     struct sctp_nets *net,
  180     int mode)
  181 {
  182         /* Find and return an alternate network if possible */
  183         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
  184         int once;
  185 
  186         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
  187         int min_errors = -1;
  188         uint32_t max_cwnd = 0;
  189 
  190         if (stcb->asoc.numnets == 1) {
  191                 /* No others but net */
  192                 return (TAILQ_FIRST(&stcb->asoc.nets));
  193         }
  194         /*
  195          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
  196          * net algorithm. This algorithm chooses the active destination (not
  197          * in PF state) with the largest cwnd value. If all destinations are
  198          * in PF state, unreachable, or unconfirmed, choose the desination
  199          * that is in PF state with the lowest error count. In case of a
  200          * tie, choose the destination that was most recently active.
  201          */
  202         if (mode == 2) {
  203                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  204                         /*
  205                          * JRS 5/14/07 - If the destination is unreachable
  206                          * or unconfirmed, skip it.
  207                          */
  208                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  209                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  210                                 continue;
  211                         }
  212                         /*
  213                          * JRS 5/14/07 -  If the destination is reachable
  214                          * but in PF state, compare the error count of the
  215                          * destination to the minimum error count seen thus
  216                          * far. Store the destination with the lower error
  217                          * count.  If the error counts are equal, store the
  218                          * destination that was most recently active.
  219                          */
  220                         if (mnet->dest_state & SCTP_ADDR_PF) {
  221                                 /*
  222                                  * JRS 5/14/07 - If the destination under
  223                                  * consideration is the current destination,
  224                                  * work as if the error count is one higher.
  225                                  * The actual error count will not be
  226                                  * incremented until later in the t3
  227                                  * handler.
  228                                  */
  229                                 if (mnet == net) {
  230                                         if (min_errors == -1) {
  231                                                 min_errors = mnet->error_count + 1;
  232                                                 min_errors_net = mnet;
  233                                         } else if (mnet->error_count + 1 < min_errors) {
  234                                                 min_errors = mnet->error_count + 1;
  235                                                 min_errors_net = mnet;
  236                                         } else if (mnet->error_count + 1 == min_errors
  237                                             && mnet->last_active > min_errors_net->last_active) {
  238                                                 min_errors_net = mnet;
  239                                                 min_errors = mnet->error_count + 1;
  240                                         }
  241                                         continue;
  242                                 } else {
  243                                         if (min_errors == -1) {
  244                                                 min_errors = mnet->error_count;
  245                                                 min_errors_net = mnet;
  246                                         } else if (mnet->error_count < min_errors) {
  247                                                 min_errors = mnet->error_count;
  248                                                 min_errors_net = mnet;
  249                                         } else if (mnet->error_count == min_errors
  250                                             && mnet->last_active > min_errors_net->last_active) {
  251                                                 min_errors_net = mnet;
  252                                                 min_errors = mnet->error_count;
  253                                         }
  254                                         continue;
  255                                 }
  256                         }
  257                         /*
  258                          * JRS 5/14/07 - If the destination is reachable and
  259                          * not in PF state, compare the cwnd of the
  260                          * destination to the highest cwnd seen thus far.
  261                          * Store the destination with the higher cwnd value.
  262                          * If the cwnd values are equal, randomly choose one
  263                          * of the two destinations.
  264                          */
  265                         if (max_cwnd < mnet->cwnd) {
  266                                 max_cwnd_net = mnet;
  267                                 max_cwnd = mnet->cwnd;
  268                         } else if (max_cwnd == mnet->cwnd) {
  269                                 uint32_t rndval;
  270                                 uint8_t this_random;
  271 
  272                                 if (stcb->asoc.hb_random_idx > 3) {
  273                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  274                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
  275                                         this_random = stcb->asoc.hb_random_values[0];
  276                                         stcb->asoc.hb_random_idx++;
  277                                         stcb->asoc.hb_ect_randombit = 0;
  278                                 } else {
  279                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  280                                         stcb->asoc.hb_random_idx++;
  281                                         stcb->asoc.hb_ect_randombit = 0;
  282                                 }
  283                                 if (this_random % 2 == 1) {
  284                                         max_cwnd_net = mnet;
  285                                         max_cwnd = mnet->cwnd;  /* Useless? */
  286                                 }
  287                         }
  288                 }
  289                 if (max_cwnd_net == NULL) {
  290                         if (min_errors_net == NULL) {
  291                                 return (net);
  292                         }
  293                         return (min_errors_net);
  294                 } else {
  295                         return (max_cwnd_net);
  296                 }
  297         }
  298         /*
  299          * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
  300          * choosing an alternate net.
  301          */ 
  302         else if (mode == 1) {
  303                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  304                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  305                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  306                                 /*
  307                                  * will skip ones that are not-reachable or
  308                                  * unconfirmed
  309                                  */
  310                                 continue;
  311                         }
  312                         if (max_cwnd < mnet->cwnd) {
  313                                 max_cwnd_net = mnet;
  314                                 max_cwnd = mnet->cwnd;
  315                         } else if (max_cwnd == mnet->cwnd) {
  316                                 uint32_t rndval;
  317                                 uint8_t this_random;
  318 
  319                                 if (stcb->asoc.hb_random_idx > 3) {
  320                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  321                                         memcpy(stcb->asoc.hb_random_values, &rndval,
  322                                             sizeof(stcb->asoc.hb_random_values));
  323                                         this_random = stcb->asoc.hb_random_values[0];
  324                                         stcb->asoc.hb_random_idx = 0;
  325                                         stcb->asoc.hb_ect_randombit = 0;
  326                                 } else {
  327                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  328                                         stcb->asoc.hb_random_idx++;
  329                                         stcb->asoc.hb_ect_randombit = 0;
  330                                 }
  331                                 if (this_random % 2) {
  332                                         max_cwnd_net = mnet;
  333                                         max_cwnd = mnet->cwnd;
  334                                 }
  335                         }
  336                 }
  337                 if (max_cwnd_net) {
  338                         return (max_cwnd_net);
  339                 }
  340         }
  341         mnet = net;
  342         once = 0;
  343 
  344         if (mnet == NULL) {
  345                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
  346                 if (mnet == NULL) {
  347                         return (NULL);
  348                 }
  349         }
  350         do {
  351                 alt = TAILQ_NEXT(mnet, sctp_next);
  352                 if (alt == NULL) {
  353                         once++;
  354                         if (once > 1) {
  355                                 break;
  356                         }
  357                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  358                         if (alt == NULL) {
  359                                 return (NULL);
  360                         }
  361                 }
  362                 if (alt->ro.ro_rt == NULL) {
  363                         if (alt->ro._s_addr) {
  364                                 sctp_free_ifa(alt->ro._s_addr);
  365                                 alt->ro._s_addr = NULL;
  366                         }
  367                         alt->src_addr_selected = 0;
  368                 }
  369                 /* sa_ignore NO_NULL_CHK */
  370                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
  371                     (alt->ro.ro_rt != NULL) &&
  372                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
  373                         /* Found a reachable address */
  374                         break;
  375                 }
  376                 mnet = alt;
  377         } while (alt != NULL);
  378 
  379         if (alt == NULL) {
  380                 /* Case where NO insv network exists (dormant state) */
  381                 /* we rotate destinations */
  382                 once = 0;
  383                 mnet = net;
  384                 do {
  385                         if (mnet == NULL) {
  386                                 return (TAILQ_FIRST(&stcb->asoc.nets));
  387                         }
  388                         alt = TAILQ_NEXT(mnet, sctp_next);
  389                         if (alt == NULL) {
  390                                 once++;
  391                                 if (once > 1) {
  392                                         break;
  393                                 }
  394                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
  395                         }
  396                         /* sa_ignore NO_NULL_CHK */
  397                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  398                             (alt != net)) {
  399                                 /* Found an alternate address */
  400                                 break;
  401                         }
  402                         mnet = alt;
  403                 } while (alt != NULL);
  404         }
  405         if (alt == NULL) {
  406                 return (net);
  407         }
  408         return (alt);
  409 }
  410 
  411 static void
  412 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
  413     struct sctp_nets *net,
  414     int win_probe,
  415     int num_marked, int num_abandoned)
  416 {
  417         if (net->RTO == 0) {
  418                 net->RTO = stcb->asoc.minrto;
  419         }
  420         net->RTO <<= 1;
  421         if (net->RTO > stcb->asoc.maxrto) {
  422                 net->RTO = stcb->asoc.maxrto;
  423         }
  424         if ((win_probe == 0) && (num_marked || num_abandoned)) {
  425                 /* We don't apply penalty to window probe scenarios */
  426                 /* JRS - Use the congestion control given in the CC module */
  427                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
  428         }
  429 }
  430 
  431 #ifndef INVARIANTS
  432 static void
  433 sctp_recover_sent_list(struct sctp_tcb *stcb)
  434 {
  435         struct sctp_tmit_chunk *chk, *nchk;
  436         struct sctp_association *asoc;
  437 
  438         asoc = &stcb->asoc;
  439         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  440                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
  441                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
  442                             chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
  443                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  444                         if (chk->pr_sctp_on) {
  445                                 if (asoc->pr_sctp_cnt != 0)
  446                                         asoc->pr_sctp_cnt--;
  447                         }
  448                         if (chk->data) {
  449                                 /* sa_ignore NO_NULL_CHK */
  450                                 sctp_free_bufspace(stcb, asoc, chk, 1);
  451                                 sctp_m_freem(chk->data);
  452                                 chk->data = NULL;
  453                                 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(chk->flags)) {
  454                                         asoc->sent_queue_cnt_removeable--;
  455                                 }
  456                         }
  457                         asoc->sent_queue_cnt--;
  458                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  459                 }
  460         }
  461         SCTP_PRINTF("after recover order is as follows\n");
  462         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  463                 SCTP_PRINTF("chk:%p TSN:%x\n", chk, chk->rec.data.TSN_seq);
  464         }
  465 }
  466 
  467 #endif
  468 
  469 static int
  470 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
  471     struct sctp_nets *net,
  472     struct sctp_nets *alt,
  473     int window_probe,
  474     int *num_marked,
  475     int *num_abandoned)
  476 {
  477 
  478         /*
  479          * Mark all chunks (well not all) that were sent to *net for
  480          * retransmission. Move them to alt for there destination as well...
  481          * We only mark chunks that have been outstanding long enough to
  482          * have received feed-back.
  483          */
  484         struct sctp_tmit_chunk *chk, *nchk;
  485         struct sctp_nets *lnets;
  486         struct timeval now, min_wait, tv;
  487         int cur_rto;
  488         int cnt_abandoned;
  489         int audit_tf, num_mk, fir;
  490         unsigned int cnt_mk;
  491         uint32_t orig_flight, orig_tf;
  492         uint32_t tsnlast, tsnfirst;
  493         int recovery_cnt = 0;
  494 
  495 
  496         /* none in flight now */
  497         audit_tf = 0;
  498         fir = 0;
  499         /*
  500          * figure out how long a data chunk must be pending before we can
  501          * mark it ..
  502          */
  503         (void)SCTP_GETTIME_TIMEVAL(&now);
  504         /* get cur rto in micro-seconds */
  505         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
  506         cur_rto *= 1000;
  507         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  508                 sctp_log_fr(cur_rto,
  509                     stcb->asoc.peers_rwnd,
  510                     window_probe,
  511                     SCTP_FR_T3_MARK_TIME);
  512                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
  513                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
  514         }
  515         tv.tv_sec = cur_rto / 1000000;
  516         tv.tv_usec = cur_rto % 1000000;
  517         min_wait = now;
  518         timevalsub(&min_wait, &tv);
  519         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
  520                 /*
  521                  * if we hit here, we don't have enough seconds on the clock
  522                  * to account for the RTO. We just let the lower seconds be
  523                  * the bounds and don't worry about it. This may mean we
  524                  * will mark a lot more than we should.
  525                  */
  526                 min_wait.tv_sec = min_wait.tv_usec = 0;
  527         }
  528         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  529                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
  530                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
  531         }
  532         /*
  533          * Our rwnd will be incorrect here since we are not adding back the
  534          * cnt * mbuf but we will fix that down below.
  535          */
  536         orig_flight = net->flight_size;
  537         orig_tf = stcb->asoc.total_flight;
  538 
  539         net->fast_retran_ip = 0;
  540         /* Now on to each chunk */
  541         cnt_abandoned = 0;
  542         num_mk = cnt_mk = 0;
  543         tsnfirst = tsnlast = 0;
  544 #ifndef INVARIANTS
  545 start_again:
  546 #endif
  547         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
  548                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
  549                         /* Strange case our list got out of order? */
  550                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x",
  551                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
  552                         recovery_cnt++;
  553 #ifdef INVARIANTS
  554                         panic("last acked >= chk on sent-Q");
  555 #else
  556                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
  557                         sctp_recover_sent_list(stcb);
  558                         if (recovery_cnt < 10) {
  559                                 goto start_again;
  560                         } else {
  561                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
  562                         }
  563 #endif
  564                 }
  565                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
  566                         /*
  567                          * found one to mark: If it is less than
  568                          * DATAGRAM_ACKED it MUST not be a skipped or marked
  569                          * TSN but instead one that is either already set
  570                          * for retransmission OR one that needs
  571                          * retransmission.
  572                          */
  573 
  574                         /* validate its been outstanding long enough */
  575                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  576                                 sctp_log_fr(chk->rec.data.TSN_seq,
  577                                     chk->sent_rcv_time.tv_sec,
  578                                     chk->sent_rcv_time.tv_usec,
  579                                     SCTP_FR_T3_MARK_TIME);
  580                         }
  581                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
  582                                 /*
  583                                  * we have reached a chunk that was sent
  584                                  * some seconds past our min.. forget it we
  585                                  * will find no more to send.
  586                                  */
  587                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  588                                         sctp_log_fr(0,
  589                                             chk->sent_rcv_time.tv_sec,
  590                                             chk->sent_rcv_time.tv_usec,
  591                                             SCTP_FR_T3_STOPPED);
  592                                 }
  593                                 continue;
  594                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
  595                             (window_probe == 0)) {
  596                                 /*
  597                                  * we must look at the micro seconds to
  598                                  * know.
  599                                  */
  600                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
  601                                         /*
  602                                          * ok it was sent after our boundary
  603                                          * time.
  604                                          */
  605                                         continue;
  606                                 }
  607                         }
  608                         if (stcb->asoc.peer_supports_prsctp && PR_SCTP_TTL_ENABLED(chk->flags)) {
  609                                 /* Is it expired? */
  610                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
  611                                         /* Yes so drop it */
  612                                         if (chk->data) {
  613                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  614                                                     chk,
  615                                                     1,
  616                                                     SCTP_SO_NOT_LOCKED);
  617                                                 cnt_abandoned++;
  618                                         }
  619                                         continue;
  620                                 }
  621                         }
  622                         if (stcb->asoc.peer_supports_prsctp && PR_SCTP_RTX_ENABLED(chk->flags)) {
  623                                 /* Has it been retransmitted tv_sec times? */
  624                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
  625                                         if (chk->data) {
  626                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  627                                                     chk,
  628                                                     1,
  629                                                     SCTP_SO_NOT_LOCKED);
  630                                                 cnt_abandoned++;
  631                                         }
  632                                         continue;
  633                                 }
  634                         }
  635                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  636                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  637                                 num_mk++;
  638                                 if (fir == 0) {
  639                                         fir = 1;
  640                                         tsnfirst = chk->rec.data.TSN_seq;
  641                                 }
  642                                 tsnlast = chk->rec.data.TSN_seq;
  643                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  644                                         sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
  645                                             0, SCTP_FR_T3_MARKED);
  646                                 }
  647                                 if (chk->rec.data.chunk_was_revoked) {
  648                                         /* deflate the cwnd */
  649                                         chk->whoTo->cwnd -= chk->book_size;
  650                                         chk->rec.data.chunk_was_revoked = 0;
  651                                 }
  652                                 net->marked_retrans++;
  653                                 stcb->asoc.marked_retrans++;
  654                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  655                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  656                                             chk->whoTo->flight_size,
  657                                             chk->book_size,
  658                                             (uintptr_t) chk->whoTo,
  659                                             chk->rec.data.TSN_seq);
  660                                 }
  661                                 sctp_flight_size_decrease(chk);
  662                                 sctp_total_flight_decrease(stcb, chk);
  663                                 stcb->asoc.peers_rwnd += chk->send_size;
  664                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  665                         }
  666                         chk->sent = SCTP_DATAGRAM_RESEND;
  667                         SCTP_STAT_INCR(sctps_markedretrans);
  668 
  669                         /* reset the TSN for striking and other FR stuff */
  670                         chk->rec.data.doing_fast_retransmit = 0;
  671                         /* Clear any time so NO RTT is being done */
  672 
  673                         if (chk->do_rtt) {
  674                                 if (chk->whoTo->rto_needed == 0) {
  675                                         chk->whoTo->rto_needed = 1;
  676                                 }
  677                         }
  678                         chk->do_rtt = 0;
  679                         if (alt != net) {
  680                                 sctp_free_remote_addr(chk->whoTo);
  681                                 chk->no_fr_allowed = 1;
  682                                 chk->whoTo = alt;
  683                                 atomic_add_int(&alt->ref_count, 1);
  684                         } else {
  685                                 chk->no_fr_allowed = 0;
  686                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  687                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  688                                 } else {
  689                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
  690                                 }
  691                         }
  692                         /*
  693                          * CMT: Do not allow FRs on retransmitted TSNs.
  694                          */
  695                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  696                                 chk->no_fr_allowed = 1;
  697                         }
  698 #ifdef THIS_SHOULD_NOT_BE_DONE
  699                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  700                         /* remember highest acked one */
  701                         could_be_sent = chk;
  702 #endif
  703                 }
  704                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  705                         cnt_mk++;
  706                 }
  707         }
  708         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  709                 /* we did not subtract the same things? */
  710                 audit_tf = 1;
  711         }
  712         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  713                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  714         }
  715 #ifdef SCTP_DEBUG
  716         if (num_mk) {
  717                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  718                     tsnlast);
  719                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
  720                     num_mk, (u_long)stcb->asoc.peers_rwnd);
  721                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  722                     tsnlast);
  723                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
  724                     num_mk,
  725                     (int)stcb->asoc.peers_rwnd);
  726         }
  727 #endif
  728         *num_marked = num_mk;
  729         *num_abandoned = cnt_abandoned;
  730         /*
  731          * Now check for a ECN Echo that may be stranded And include the
  732          * cnt_mk'd to have all resends in the control queue.
  733          */
  734         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  735                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  736                         cnt_mk++;
  737                 }
  738                 if ((chk->whoTo == net) &&
  739                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  740                         sctp_free_remote_addr(chk->whoTo);
  741                         chk->whoTo = alt;
  742                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  743                                 chk->sent = SCTP_DATAGRAM_RESEND;
  744                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  745                                 cnt_mk++;
  746                         }
  747                         atomic_add_int(&alt->ref_count, 1);
  748                 }
  749         }
  750 #ifdef THIS_SHOULD_NOT_BE_DONE
  751         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  752                 /* fix it so we retransmit the highest acked anyway */
  753                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  754                 cnt_mk++;
  755                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  756         }
  757 #endif
  758         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  759 #ifdef INVARIANTS
  760                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  761                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  762 #endif
  763 #ifndef SCTP_AUDITING_ENABLED
  764                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  765 #endif
  766         }
  767         if (audit_tf) {
  768                 SCTPDBG(SCTP_DEBUG_TIMER4,
  769                     "Audit total flight due to negative value net:%p\n",
  770                     net);
  771                 stcb->asoc.total_flight = 0;
  772                 stcb->asoc.total_flight_count = 0;
  773                 /* Clear all networks flight size */
  774                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  775                         lnets->flight_size = 0;
  776                         SCTPDBG(SCTP_DEBUG_TIMER4,
  777                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  778                             lnets, lnets->cwnd, lnets->ssthresh);
  779                 }
  780                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  781                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  782                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  783                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  784                                             chk->whoTo->flight_size,
  785                                             chk->book_size,
  786                                             (uintptr_t) chk->whoTo,
  787                                             chk->rec.data.TSN_seq);
  788                                 }
  789                                 sctp_flight_size_increase(chk);
  790                                 sctp_total_flight_increase(stcb, chk);
  791                         }
  792                 }
  793         }
  794         /* We return 1 if we only have a window probe outstanding */
  795         return (0);
  796 }
  797 
  798 
  799 int
  800 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  801     struct sctp_tcb *stcb,
  802     struct sctp_nets *net)
  803 {
  804         struct sctp_nets *alt;
  805         int win_probe, num_mk, num_abandoned;
  806 
  807         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  808                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  809         }
  810         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  811                 struct sctp_nets *lnet;
  812 
  813                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  814                         if (net == lnet) {
  815                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  816                         } else {
  817                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  818                         }
  819                 }
  820         }
  821         /* Find an alternate and mark those for retransmission */
  822         if ((stcb->asoc.peers_rwnd == 0) &&
  823             (stcb->asoc.total_flight < net->mtu)) {
  824                 SCTP_STAT_INCR(sctps_timowindowprobe);
  825                 win_probe = 1;
  826         } else {
  827                 win_probe = 0;
  828         }
  829 
  830         if (win_probe == 0) {
  831                 /* We don't do normal threshold management on window probes */
  832                 if (sctp_threshold_management(inp, stcb, net,
  833                     stcb->asoc.max_send_times)) {
  834                         /* Association was destroyed */
  835                         return (1);
  836                 } else {
  837                         if (net != stcb->asoc.primary_destination) {
  838                                 /* send a immediate HB if our RTO is stale */
  839                                 struct timeval now;
  840                                 unsigned int ms_goneby;
  841 
  842                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  843                                 if (net->last_sent_time.tv_sec) {
  844                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  845                                 } else {
  846                                         ms_goneby = 0;
  847                                 }
  848                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  849                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  850                                                 /*
  851                                                  * no recent feed back in an
  852                                                  * RTO or more, request a
  853                                                  * RTT update
  854                                                  */
  855                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  856                                         }
  857                                 }
  858                         }
  859                 }
  860         } else {
  861                 /*
  862                  * For a window probe we don't penalize the net's but only
  863                  * the association. This may fail it if SACKs are not coming
  864                  * back. If sack's are coming with rwnd locked at 0, we will
  865                  * continue to hold things waiting for rwnd to raise
  866                  */
  867                 if (sctp_threshold_management(inp, stcb, NULL,
  868                     stcb->asoc.max_send_times)) {
  869                         /* Association was destroyed */
  870                         return (1);
  871                 }
  872         }
  873         if (stcb->asoc.sctp_cmt_on_off > 0) {
  874                 if (net->pf_threshold < net->failure_threshold) {
  875                         alt = sctp_find_alternate_net(stcb, net, 2);
  876                 } else {
  877                         /*
  878                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  879                          * being used, then pick dest with largest ssthresh
  880                          * for any retransmission.
  881                          */
  882                         alt = sctp_find_alternate_net(stcb, net, 1);
  883                         /*
  884                          * CUCv2: If a different dest is picked for the
  885                          * retransmission, then new (rtx-)pseudo_cumack
  886                          * needs to be tracked for orig dest. Let CUCv2
  887                          * track new (rtx-) pseudo-cumack always.
  888                          */
  889                         net->find_pseudo_cumack = 1;
  890                         net->find_rtx_pseudo_cumack = 1;
  891                 }
  892         } else {
  893                 alt = sctp_find_alternate_net(stcb, net, 0);
  894         }
  895 
  896         num_mk = 0;
  897         num_abandoned = 0;
  898         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  899             &num_mk, &num_abandoned);
  900         /* FR Loss recovery just ended with the T3. */
  901         stcb->asoc.fast_retran_loss_recovery = 0;
  902 
  903         /* CMT FR loss recovery ended with the T3 */
  904         net->fast_retran_loss_recovery = 0;
  905         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  906             (net->flight_size == 0)) {
  907                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  908         }
  909         /*
  910          * setup the sat loss recovery that prevents satellite cwnd advance.
  911          */
  912         stcb->asoc.sat_t3_loss_recovery = 1;
  913         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  914 
  915         /* Backoff the timer and cwnd */
  916         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  917         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  918             (net->dest_state & SCTP_ADDR_PF)) {
  919                 /* Move all pending over too */
  920                 sctp_move_chunks_from_net(stcb, net);
  921 
  922                 /*
  923                  * Get the address that failed, to force a new src address
  924                  * selecton and a route allocation.
  925                  */
  926                 if (net->ro._s_addr) {
  927                         sctp_free_ifa(net->ro._s_addr);
  928                         net->ro._s_addr = NULL;
  929                 }
  930                 net->src_addr_selected = 0;
  931 
  932                 /* Force a route allocation too */
  933                 if (net->ro.ro_rt) {
  934                         RTFREE(net->ro.ro_rt);
  935                         net->ro.ro_rt = NULL;
  936                 }
  937                 /* Was it our primary? */
  938                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  939                         /*
  940                          * Yes, note it as such and find an alternate note:
  941                          * this means HB code must use this to resent the
  942                          * primary if it goes active AND if someone does a
  943                          * change-primary then this flag must be cleared
  944                          * from any net structures.
  945                          */
  946                         if (stcb->asoc.alternate) {
  947                                 sctp_free_remote_addr(stcb->asoc.alternate);
  948                         }
  949                         stcb->asoc.alternate = alt;
  950                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  951                 }
  952         }
  953         /*
  954          * Special case for cookie-echo'ed case, we don't do output but must
  955          * await the COOKIE-ACK before retransmission
  956          */
  957         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  958                 /*
  959                  * Here we just reset the timer and start again since we
  960                  * have not established the asoc
  961                  */
  962                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  963                 return (0);
  964         }
  965         if (stcb->asoc.peer_supports_prsctp) {
  966                 struct sctp_tmit_chunk *lchk;
  967 
  968                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  969                 /* C3. See if we need to send a Fwd-TSN */
  970                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  971                         send_forward_tsn(stcb, &stcb->asoc);
  972                         if (lchk) {
  973                                 /* Assure a timer is up */
  974                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  975                         }
  976                 }
  977         }
  978         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  979                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  980         }
  981         return (0);
  982 }
  983 
  984 int
  985 sctp_t1init_timer(struct sctp_inpcb *inp,
  986     struct sctp_tcb *stcb,
  987     struct sctp_nets *net)
  988 {
  989         /* bump the thresholds */
  990         if (stcb->asoc.delayed_connection) {
  991                 /*
  992                  * special hook for delayed connection. The library did NOT
  993                  * complete the rest of its sends.
  994                  */
  995                 stcb->asoc.delayed_connection = 0;
  996                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
  997                 return (0);
  998         }
  999         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
 1000                 return (0);
 1001         }
 1002         if (sctp_threshold_management(inp, stcb, net,
 1003             stcb->asoc.max_init_times)) {
 1004                 /* Association was destroyed */
 1005                 return (1);
 1006         }
 1007         stcb->asoc.dropped_special_cnt = 0;
 1008         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1009         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1010                 net->RTO = stcb->asoc.initial_init_rto_max;
 1011         }
 1012         if (stcb->asoc.numnets > 1) {
 1013                 /* If we have more than one addr use it */
 1014                 struct sctp_nets *alt;
 1015 
 1016                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1017                 if (alt != stcb->asoc.primary_destination) {
 1018                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1019                         stcb->asoc.primary_destination = alt;
 1020                 }
 1021         }
 1022         /* Send out a new init */
 1023         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1024         return (0);
 1025 }
 1026 
 1027 /*
 1028  * For cookie and asconf we actually need to find and mark for resend, then
 1029  * increment the resend counter (after all the threshold management stuff of
 1030  * course).
 1031  */
 1032 int
 1033 sctp_cookie_timer(struct sctp_inpcb *inp,
 1034     struct sctp_tcb *stcb,
 1035     struct sctp_nets *net SCTP_UNUSED)
 1036 {
 1037         struct sctp_nets *alt;
 1038         struct sctp_tmit_chunk *cookie;
 1039 
 1040         /* first before all else we must find the cookie */
 1041         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1042                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1043                         break;
 1044                 }
 1045         }
 1046         if (cookie == NULL) {
 1047                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 1048                         /* FOOBAR! */
 1049                         struct mbuf *oper;
 1050 
 1051                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 1052                             0, M_DONTWAIT, 1, MT_DATA);
 1053                         if (oper) {
 1054                                 struct sctp_paramhdr *ph;
 1055                                 uint32_t *ippp;
 1056 
 1057                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 1058                                     sizeof(uint32_t);
 1059                                 ph = mtod(oper, struct sctp_paramhdr *);
 1060                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1061                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
 1062                                 ippp = (uint32_t *) (ph + 1);
 1063                                 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
 1064                         }
 1065                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4;
 1066                         sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
 1067                 } else {
 1068 #ifdef INVARIANTS
 1069                         panic("Cookie timer expires in wrong state?");
 1070 #else
 1071                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
 1072                         return (0);
 1073 #endif
 1074                 }
 1075                 return (0);
 1076         }
 1077         /* Ok we found the cookie, threshold management next */
 1078         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1079             stcb->asoc.max_init_times)) {
 1080                 /* Assoc is over */
 1081                 return (1);
 1082         }
 1083         /*
 1084          * cleared theshold management now lets backoff the address & select
 1085          * an alternate
 1086          */
 1087         stcb->asoc.dropped_special_cnt = 0;
 1088         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1089         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1090         if (alt != cookie->whoTo) {
 1091                 sctp_free_remote_addr(cookie->whoTo);
 1092                 cookie->whoTo = alt;
 1093                 atomic_add_int(&alt->ref_count, 1);
 1094         }
 1095         /* Now mark the retran info */
 1096         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1097                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1098         }
 1099         cookie->sent = SCTP_DATAGRAM_RESEND;
 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 theshold management now lets backoff the address & select
 1131          * 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                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1147                         }
 1148                         chk->whoTo = alt;
 1149                         atomic_add_int(&alt->ref_count, 1);
 1150                 }
 1151         }
 1152         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1153                 /*
 1154                  * If the address went un-reachable, we need to move to
 1155                  * alternates for ALL chk's in queue
 1156                  */
 1157                 sctp_move_chunks_from_net(stcb, net);
 1158         }
 1159         /* mark the retran info */
 1160         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1161                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1162         strrst->sent = SCTP_DATAGRAM_RESEND;
 1163 
 1164         /* restart the timer */
 1165         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 1166         return (0);
 1167 }
 1168 
 1169 int
 1170 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1171     struct sctp_nets *net)
 1172 {
 1173         struct sctp_nets *alt;
 1174         struct sctp_tmit_chunk *asconf, *chk;
 1175 
 1176         /* is this a first send, or a retransmission? */
 1177         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1178                 /* compose a new ASCONF chunk and send it */
 1179                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1180         } else {
 1181                 /*
 1182                  * Retransmission of the existing ASCONF is needed
 1183                  */
 1184 
 1185                 /* find the existing ASCONF */
 1186                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1187                 if (asconf == NULL) {
 1188                         return (0);
 1189                 }
 1190                 /* do threshold management */
 1191                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 1192                     stcb->asoc.max_send_times)) {
 1193                         /* Assoc is over */
 1194                         return (1);
 1195                 }
 1196                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1197                         /*
 1198                          * Something is rotten: our peer is not responding
 1199                          * to ASCONFs but apparently is to other chunks.
 1200                          * i.e. it is not properly handling the chunk type
 1201                          * upper bits. Mark this peer as ASCONF incapable
 1202                          * and cleanup.
 1203                          */
 1204                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1205                         sctp_asconf_cleanup(stcb, net);
 1206                         return (0);
 1207                 }
 1208                 /*
 1209                  * cleared threshold management, so now backoff the net and
 1210                  * select an alternate
 1211                  */
 1212                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 1213                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 1214                 if (asconf->whoTo != alt) {
 1215                         sctp_free_remote_addr(asconf->whoTo);
 1216                         asconf->whoTo = alt;
 1217                         atomic_add_int(&alt->ref_count, 1);
 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                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1228                                 }
 1229                                 atomic_add_int(&alt->ref_count, 1);
 1230                         }
 1231                 }
 1232                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1233                         if (chk->whoTo != alt) {
 1234                                 sctp_free_remote_addr(chk->whoTo);
 1235                                 chk->whoTo = alt;
 1236                                 atomic_add_int(&alt->ref_count, 1);
 1237                         }
 1238                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1239                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1240                         chk->sent = SCTP_DATAGRAM_RESEND;
 1241                 }
 1242                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1243                         /*
 1244                          * If the address went un-reachable, we need to move
 1245                          * to the alternate for ALL chunks in queue
 1246                          */
 1247                         sctp_move_chunks_from_net(stcb, net);
 1248                 }
 1249                 /* mark the retran info */
 1250                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1251                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1252                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1253 
 1254                 /* send another ASCONF if any and we can do */
 1255                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1256         }
 1257         return (0);
 1258 }
 1259 
 1260 /* Mobility adaptation */
 1261 void
 1262 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1263     struct sctp_nets *net SCTP_UNUSED)
 1264 {
 1265         if (stcb->asoc.deleted_primary == NULL) {
 1266                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1267                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1268                 return;
 1269         }
 1270         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1271         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1272         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1273         stcb->asoc.deleted_primary = NULL;
 1274         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1275         return;
 1276 }
 1277 
 1278 /*
 1279  * For the shutdown and shutdown-ack, we do not keep one around on the
 1280  * control queue. This means we must generate a new one and call the general
 1281  * chunk output routine, AFTER having done threshold management.
 1282  * It is assumed that net is non-NULL.
 1283  */
 1284 int
 1285 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1286     struct sctp_nets *net)
 1287 {
 1288         struct sctp_nets *alt;
 1289 
 1290         /* first threshold managment */
 1291         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1292                 /* Assoc is over */
 1293                 return (1);
 1294         }
 1295         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1296         /* second select an alternative */
 1297         alt = sctp_find_alternate_net(stcb, net, 0);
 1298 
 1299         /* third generate a shutdown into the queue for out net */
 1300         sctp_send_shutdown(stcb, alt);
 1301 
 1302         /* fourth restart timer */
 1303         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1304         return (0);
 1305 }
 1306 
 1307 int
 1308 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1309     struct sctp_nets *net)
 1310 {
 1311         struct sctp_nets *alt;
 1312 
 1313         /* first threshold managment */
 1314         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1315                 /* Assoc is over */
 1316                 return (1);
 1317         }
 1318         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1319         /* second select an alternative */
 1320         alt = sctp_find_alternate_net(stcb, net, 0);
 1321 
 1322         /* third generate a shutdown into the queue for out net */
 1323         sctp_send_shutdown_ack(stcb, alt);
 1324 
 1325         /* fourth restart timer */
 1326         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1327         return (0);
 1328 }
 1329 
 1330 static void
 1331 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1332     struct sctp_tcb *stcb)
 1333 {
 1334         struct sctp_stream_queue_pending *sp;
 1335         unsigned int i, chks_in_queue = 0;
 1336         int being_filled = 0;
 1337 
 1338         /*
 1339          * This function is ONLY called when the send/sent queues are empty.
 1340          */
 1341         if ((stcb == NULL) || (inp == NULL))
 1342                 return;
 1343 
 1344         if (stcb->asoc.sent_queue_retran_cnt) {
 1345                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1346                     stcb->asoc.sent_queue_retran_cnt);
 1347                 stcb->asoc.sent_queue_retran_cnt = 0;
 1348         }
 1349         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1350                 /* No stream scheduler information, initialize scheduler */
 1351                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1352                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1353                         /* yep, we lost a stream or two */
 1354                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1355                 } else {
 1356                         /* no streams lost */
 1357                         stcb->asoc.total_output_queue_size = 0;
 1358                 }
 1359         }
 1360         /* Check to see if some data queued, if so report it */
 1361         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1362                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1363                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1364                                 if (sp->msg_is_complete)
 1365                                         being_filled++;
 1366                                 chks_in_queue++;
 1367                         }
 1368                 }
 1369         }
 1370         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1371                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1372                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1373         }
 1374         if (chks_in_queue) {
 1375                 /* call the output queue function */
 1376                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1377                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1378                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1379                         /*
 1380                          * Probably should go in and make it go back through
 1381                          * and add fragments allowed
 1382                          */
 1383                         if (being_filled == 0) {
 1384                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1385                                     chks_in_queue);
 1386                         }
 1387                 }
 1388         } else {
 1389                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1390                     (u_long)stcb->asoc.total_output_queue_size);
 1391                 stcb->asoc.total_output_queue_size = 0;
 1392         }
 1393 }
 1394 
 1395 int
 1396 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1397     struct sctp_nets *net)
 1398 {
 1399         uint8_t net_was_pf;
 1400 
 1401         if (net->dest_state & SCTP_ADDR_PF) {
 1402                 net_was_pf = 1;
 1403         } else {
 1404                 net_was_pf = 0;
 1405         }
 1406         if (net->hb_responded == 0) {
 1407                 if (net->ro._s_addr) {
 1408                         /*
 1409                          * Invalidate the src address if we did not get a
 1410                          * response last time.
 1411                          */
 1412                         sctp_free_ifa(net->ro._s_addr);
 1413                         net->ro._s_addr = NULL;
 1414                         net->src_addr_selected = 0;
 1415                 }
 1416                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1417                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1418                         /* Assoc is over */
 1419                         return (1);
 1420                 }
 1421         }
 1422         /* Zero PBA, if it needs it */
 1423         if (net->partial_bytes_acked) {
 1424                 net->partial_bytes_acked = 0;
 1425         }
 1426         if ((stcb->asoc.total_output_queue_size > 0) &&
 1427             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1428             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1429                 sctp_audit_stream_queues_for_size(inp, stcb);
 1430         }
 1431         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1432             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1433                 /*
 1434                  * when move to PF during threshold mangement, a HB has been
 1435                  * queued in that routine
 1436                  */
 1437                 uint32_t ms_gone_by;
 1438 
 1439                 if ((net->last_sent_time.tv_sec > 0) ||
 1440                     (net->last_sent_time.tv_usec > 0)) {
 1441                         struct timeval diff;
 1442 
 1443                         SCTP_GETTIME_TIMEVAL(&diff);
 1444                         timevalsub(&diff, &net->last_sent_time);
 1445                         ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
 1446                             (uint32_t) (diff.tv_usec / 1000);
 1447                 } else {
 1448                         ms_gone_by = 0xffffffff;
 1449                 }
 1450                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1451                     (net->dest_state & SCTP_ADDR_PF)) {
 1452                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1453                 }
 1454         }
 1455         return (0);
 1456 }
 1457 
 1458 void
 1459 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1460     struct sctp_tcb *stcb,
 1461     struct sctp_nets *net)
 1462 {
 1463         uint32_t next_mtu, mtu;
 1464 
 1465         next_mtu = sctp_get_next_mtu(net->mtu);
 1466 
 1467         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1468                 if ((net->src_addr_selected == 0) ||
 1469                     (net->ro._s_addr == NULL) ||
 1470                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1471                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1472                                 sctp_free_ifa(net->ro._s_addr);
 1473                                 net->ro._s_addr = NULL;
 1474                                 net->src_addr_selected = 0;
 1475                         } else if (net->ro._s_addr == NULL) {
 1476 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1477                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1478                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1479 
 1480                                         /* KAME hack: embed scopeid */
 1481                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1482                                 }
 1483 #endif
 1484 
 1485                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1486                                     stcb,
 1487                                     (sctp_route_t *) & net->ro,
 1488                                     net, 0, stcb->asoc.vrf_id);
 1489 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1490                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1491                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1492 
 1493                                         (void)sa6_recoverscope(sin6);
 1494                                 }
 1495 #endif                          /* INET6 */
 1496                         }
 1497                         if (net->ro._s_addr)
 1498                                 net->src_addr_selected = 1;
 1499                 }
 1500                 if (net->ro._s_addr) {
 1501                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1502                         if (net->port) {
 1503                                 mtu -= sizeof(struct udphdr);
 1504                         }
 1505                         if (mtu > next_mtu) {
 1506                                 net->mtu = next_mtu;
 1507                         }
 1508                 }
 1509         }
 1510         /* restart the timer */
 1511         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1512 }
 1513 
 1514 void
 1515 sctp_autoclose_timer(struct sctp_inpcb *inp,
 1516     struct sctp_tcb *stcb,
 1517     struct sctp_nets *net)
 1518 {
 1519         struct timeval tn, *tim_touse;
 1520         struct sctp_association *asoc;
 1521         int ticks_gone_by;
 1522 
 1523         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1524         if (stcb->asoc.sctp_autoclose_ticks &&
 1525             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1526                 /* Auto close is on */
 1527                 asoc = &stcb->asoc;
 1528                 /* pick the time to use */
 1529                 if (asoc->time_last_rcvd.tv_sec >
 1530                     asoc->time_last_sent.tv_sec) {
 1531                         tim_touse = &asoc->time_last_rcvd;
 1532                 } else {
 1533                         tim_touse = &asoc->time_last_sent;
 1534                 }
 1535                 /* Now has long enough transpired to autoclose? */
 1536                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 1537                 if ((ticks_gone_by > 0) &&
 1538                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
 1539                         /*
 1540                          * autoclose time has hit, call the output routine,
 1541                          * which should do nothing just to be SURE we don't
 1542                          * have hanging data. We can then safely check the
 1543                          * queues and know that we are clear to send
 1544                          * shutdown
 1545                          */
 1546                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1547                         /* Are we clean? */
 1548                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1549                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1550                                 /*
 1551                                  * there is nothing queued to send, so I'm
 1552                                  * done...
 1553                                  */
 1554                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1555                                         /* only send SHUTDOWN 1st time thru */
 1556                                         struct sctp_nets *netp;
 1557 
 1558                                         if (stcb->asoc.alternate) {
 1559                                                 netp = stcb->asoc.alternate;
 1560                                         } else {
 1561                                                 netp = stcb->asoc.primary_destination;
 1562                                         }
 1563                                         sctp_send_shutdown(stcb, netp);
 1564                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 1565                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1566                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1567                                         }
 1568                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 1569                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 1570                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1571                                             stcb->sctp_ep, stcb,
 1572                                             netp);
 1573                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1574                                             stcb->sctp_ep, stcb,
 1575                                             netp);
 1576                                 }
 1577                         }
 1578                 } else {
 1579                         /*
 1580                          * No auto close at this time, reset t-o to check
 1581                          * later
 1582                          */
 1583                         int tmp;
 1584 
 1585                         /* fool the timer startup to use the time left */
 1586                         tmp = asoc->sctp_autoclose_ticks;
 1587                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1588                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1589                             net);
 1590                         /* restore the real tick value */
 1591                         asoc->sctp_autoclose_ticks = tmp;
 1592                 }
 1593         }
 1594 }

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