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/10.0/sys/netinet/sctp_timer.c 258454 2013-11-21 23:00:09Z 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                     (void *)net, net->error_count,
   94                     net->failure_threshold);
   95                 if (net->error_count > net->failure_threshold) {
   96                         /* We had a threshold failure */
   97                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
   98                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
   99                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  100                                 net->dest_state &= ~SCTP_ADDR_PF;
  101                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  102                                     stcb, 0,
  103                                     (void *)net, SCTP_SO_NOT_LOCKED);
  104                         }
  105                 } else if ((net->pf_threshold < net->failure_threshold) &&
  106                     (net->error_count > net->pf_threshold)) {
  107                         if (!(net->dest_state & SCTP_ADDR_PF)) {
  108                                 net->dest_state |= SCTP_ADDR_PF;
  109                                 net->last_active = sctp_get_tick_count();
  110                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  111                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
  112                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
  113                         }
  114                 }
  115         }
  116         if (stcb == NULL)
  117                 return (0);
  118 
  119         if (net) {
  120                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
  121                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  122                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
  123                                     stcb->asoc.overall_error_count,
  124                                     (stcb->asoc.overall_error_count + 1),
  125                                     SCTP_FROM_SCTP_TIMER,
  126                                     __LINE__);
  127                         }
  128                         stcb->asoc.overall_error_count++;
  129                 }
  130         } else {
  131                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  132                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
  133                             stcb->asoc.overall_error_count,
  134                             (stcb->asoc.overall_error_count + 1),
  135                             SCTP_FROM_SCTP_TIMER,
  136                             __LINE__);
  137                 }
  138                 stcb->asoc.overall_error_count++;
  139         }
  140         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
  141             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
  142             (uint32_t) threshold,
  143             ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
  144         /*
  145          * We specifically do not do >= to give the assoc one more change
  146          * before we fail it.
  147          */
  148         if (stcb->asoc.overall_error_count > threshold) {
  149                 /* Abort notification sends a ULP notify */
  150                 struct mbuf *oper;
  151 
  152                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
  153                     0, M_NOWAIT, 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                             (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
  443                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
  444                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
  445                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
  446                                 }
  447                         }
  448                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  449                         if (PR_SCTP_ENABLED(chk->flags)) {
  450                                 if (asoc->pr_sctp_cnt != 0)
  451                                         asoc->pr_sctp_cnt--;
  452                         }
  453                         if (chk->data) {
  454                                 /* sa_ignore NO_NULL_CHK */
  455                                 sctp_free_bufspace(stcb, asoc, chk, 1);
  456                                 sctp_m_freem(chk->data);
  457                                 chk->data = NULL;
  458                                 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(chk->flags)) {
  459                                         asoc->sent_queue_cnt_removeable--;
  460                                 }
  461                         }
  462                         asoc->sent_queue_cnt--;
  463                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  464                 }
  465         }
  466         SCTP_PRINTF("after recover order is as follows\n");
  467         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  468                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
  469         }
  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_seq)) {
  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_seq);
  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_seq,
  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.peer_supports_prsctp && 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.peer_supports_prsctp && 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_seq;
  646                                 }
  647                                 tsnlast = chk->rec.data.TSN_seq;
  648                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  649                                         sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
  650                                             0, SCTP_FR_T3_MARKED);
  651                                 }
  652                                 if (chk->rec.data.chunk_was_revoked) {
  653                                         /* deflate the cwnd */
  654                                         chk->whoTo->cwnd -= chk->book_size;
  655                                         chk->rec.data.chunk_was_revoked = 0;
  656                                 }
  657                                 net->marked_retrans++;
  658                                 stcb->asoc.marked_retrans++;
  659                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  660                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  661                                             chk->whoTo->flight_size,
  662                                             chk->book_size,
  663                                             (uintptr_t) chk->whoTo,
  664                                             chk->rec.data.TSN_seq);
  665                                 }
  666                                 sctp_flight_size_decrease(chk);
  667                                 sctp_total_flight_decrease(stcb, chk);
  668                                 stcb->asoc.peers_rwnd += chk->send_size;
  669                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  670                         }
  671                         chk->sent = SCTP_DATAGRAM_RESEND;
  672                         SCTP_STAT_INCR(sctps_markedretrans);
  673 
  674                         /* reset the TSN for striking and other FR stuff */
  675                         chk->rec.data.doing_fast_retransmit = 0;
  676                         /* Clear any time so NO RTT is being done */
  677 
  678                         if (chk->do_rtt) {
  679                                 if (chk->whoTo->rto_needed == 0) {
  680                                         chk->whoTo->rto_needed = 1;
  681                                 }
  682                         }
  683                         chk->do_rtt = 0;
  684                         if (alt != net) {
  685                                 sctp_free_remote_addr(chk->whoTo);
  686                                 chk->no_fr_allowed = 1;
  687                                 chk->whoTo = alt;
  688                                 atomic_add_int(&alt->ref_count, 1);
  689                         } else {
  690                                 chk->no_fr_allowed = 0;
  691                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  692                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  693                                 } else {
  694                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
  695                                 }
  696                         }
  697                         /*
  698                          * CMT: Do not allow FRs on retransmitted TSNs.
  699                          */
  700                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  701                                 chk->no_fr_allowed = 1;
  702                         }
  703 #ifdef THIS_SHOULD_NOT_BE_DONE
  704                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  705                         /* remember highest acked one */
  706                         could_be_sent = chk;
  707 #endif
  708                 }
  709                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  710                         cnt_mk++;
  711                 }
  712         }
  713         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  714                 /* we did not subtract the same things? */
  715                 audit_tf = 1;
  716         }
  717         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  718                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  719         }
  720 #ifdef SCTP_DEBUG
  721         if (num_mk) {
  722                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  723                     tsnlast);
  724                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
  725                     num_mk, (u_long)stcb->asoc.peers_rwnd);
  726                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  727                     tsnlast);
  728                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
  729                     num_mk,
  730                     (int)stcb->asoc.peers_rwnd);
  731         }
  732 #endif
  733         *num_marked = num_mk;
  734         *num_abandoned = cnt_abandoned;
  735         /*
  736          * Now check for a ECN Echo that may be stranded And include the
  737          * cnt_mk'd to have all resends in the control queue.
  738          */
  739         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  740                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  741                         cnt_mk++;
  742                 }
  743                 if ((chk->whoTo == net) &&
  744                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  745                         sctp_free_remote_addr(chk->whoTo);
  746                         chk->whoTo = alt;
  747                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  748                                 chk->sent = SCTP_DATAGRAM_RESEND;
  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                                             (uintptr_t) chk->whoTo,
  792                                             chk->rec.data.TSN_seq);
  793                                 }
  794                                 sctp_flight_size_increase(chk);
  795                                 sctp_total_flight_increase(stcb, chk);
  796                         }
  797                 }
  798         }
  799         /* We return 1 if we only have a window probe outstanding */
  800         return (0);
  801 }
  802 
  803 
  804 int
  805 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  806     struct sctp_tcb *stcb,
  807     struct sctp_nets *net)
  808 {
  809         struct sctp_nets *alt;
  810         int win_probe, num_mk, num_abandoned;
  811 
  812         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  813                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  814         }
  815         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  816                 struct sctp_nets *lnet;
  817 
  818                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  819                         if (net == lnet) {
  820                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  821                         } else {
  822                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  823                         }
  824                 }
  825         }
  826         /* Find an alternate and mark those for retransmission */
  827         if ((stcb->asoc.peers_rwnd == 0) &&
  828             (stcb->asoc.total_flight < net->mtu)) {
  829                 SCTP_STAT_INCR(sctps_timowindowprobe);
  830                 win_probe = 1;
  831         } else {
  832                 win_probe = 0;
  833         }
  834 
  835         if (win_probe == 0) {
  836                 /* We don't do normal threshold management on window probes */
  837                 if (sctp_threshold_management(inp, stcb, net,
  838                     stcb->asoc.max_send_times)) {
  839                         /* Association was destroyed */
  840                         return (1);
  841                 } else {
  842                         if (net != stcb->asoc.primary_destination) {
  843                                 /* send a immediate HB if our RTO is stale */
  844                                 struct timeval now;
  845                                 unsigned int ms_goneby;
  846 
  847                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  848                                 if (net->last_sent_time.tv_sec) {
  849                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  850                                 } else {
  851                                         ms_goneby = 0;
  852                                 }
  853                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  854                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  855                                                 /*
  856                                                  * no recent feed back in an
  857                                                  * RTO or more, request a
  858                                                  * RTT update
  859                                                  */
  860                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  861                                         }
  862                                 }
  863                         }
  864                 }
  865         } else {
  866                 /*
  867                  * For a window probe we don't penalize the net's but only
  868                  * the association. This may fail it if SACKs are not coming
  869                  * back. If sack's are coming with rwnd locked at 0, we will
  870                  * continue to hold things waiting for rwnd to raise
  871                  */
  872                 if (sctp_threshold_management(inp, stcb, NULL,
  873                     stcb->asoc.max_send_times)) {
  874                         /* Association was destroyed */
  875                         return (1);
  876                 }
  877         }
  878         if (stcb->asoc.sctp_cmt_on_off > 0) {
  879                 if (net->pf_threshold < net->failure_threshold) {
  880                         alt = sctp_find_alternate_net(stcb, net, 2);
  881                 } else {
  882                         /*
  883                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  884                          * being used, then pick dest with largest ssthresh
  885                          * for any retransmission.
  886                          */
  887                         alt = sctp_find_alternate_net(stcb, net, 1);
  888                         /*
  889                          * CUCv2: If a different dest is picked for the
  890                          * retransmission, then new (rtx-)pseudo_cumack
  891                          * needs to be tracked for orig dest. Let CUCv2
  892                          * track new (rtx-) pseudo-cumack always.
  893                          */
  894                         net->find_pseudo_cumack = 1;
  895                         net->find_rtx_pseudo_cumack = 1;
  896                 }
  897         } else {
  898                 alt = sctp_find_alternate_net(stcb, net, 0);
  899         }
  900 
  901         num_mk = 0;
  902         num_abandoned = 0;
  903         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  904             &num_mk, &num_abandoned);
  905         /* FR Loss recovery just ended with the T3. */
  906         stcb->asoc.fast_retran_loss_recovery = 0;
  907 
  908         /* CMT FR loss recovery ended with the T3 */
  909         net->fast_retran_loss_recovery = 0;
  910         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  911             (net->flight_size == 0)) {
  912                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  913         }
  914         /*
  915          * setup the sat loss recovery that prevents satellite cwnd advance.
  916          */
  917         stcb->asoc.sat_t3_loss_recovery = 1;
  918         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  919 
  920         /* Backoff the timer and cwnd */
  921         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  922         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  923             (net->dest_state & SCTP_ADDR_PF)) {
  924                 /* Move all pending over too */
  925                 sctp_move_chunks_from_net(stcb, net);
  926 
  927                 /*
  928                  * Get the address that failed, to force a new src address
  929                  * selecton and a route allocation.
  930                  */
  931                 if (net->ro._s_addr) {
  932                         sctp_free_ifa(net->ro._s_addr);
  933                         net->ro._s_addr = NULL;
  934                 }
  935                 net->src_addr_selected = 0;
  936 
  937                 /* Force a route allocation too */
  938                 if (net->ro.ro_rt) {
  939                         RTFREE(net->ro.ro_rt);
  940                         net->ro.ro_rt = NULL;
  941                 }
  942                 /* Was it our primary? */
  943                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  944                         /*
  945                          * Yes, note it as such and find an alternate note:
  946                          * this means HB code must use this to resent the
  947                          * primary if it goes active AND if someone does a
  948                          * change-primary then this flag must be cleared
  949                          * from any net structures.
  950                          */
  951                         if (stcb->asoc.alternate) {
  952                                 sctp_free_remote_addr(stcb->asoc.alternate);
  953                         }
  954                         stcb->asoc.alternate = alt;
  955                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  956                 }
  957         }
  958         /*
  959          * Special case for cookie-echo'ed case, we don't do output but must
  960          * await the COOKIE-ACK before retransmission
  961          */
  962         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  963                 /*
  964                  * Here we just reset the timer and start again since we
  965                  * have not established the asoc
  966                  */
  967                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  968                 return (0);
  969         }
  970         if (stcb->asoc.peer_supports_prsctp) {
  971                 struct sctp_tmit_chunk *lchk;
  972 
  973                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  974                 /* C3. See if we need to send a Fwd-TSN */
  975                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  976                         send_forward_tsn(stcb, &stcb->asoc);
  977                         if (lchk) {
  978                                 /* Assure a timer is up */
  979                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  980                         }
  981                 }
  982         }
  983         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  984                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  985         }
  986         return (0);
  987 }
  988 
  989 int
  990 sctp_t1init_timer(struct sctp_inpcb *inp,
  991     struct sctp_tcb *stcb,
  992     struct sctp_nets *net)
  993 {
  994         /* bump the thresholds */
  995         if (stcb->asoc.delayed_connection) {
  996                 /*
  997                  * special hook for delayed connection. The library did NOT
  998                  * complete the rest of its sends.
  999                  */
 1000                 stcb->asoc.delayed_connection = 0;
 1001                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1002                 return (0);
 1003         }
 1004         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
 1005                 return (0);
 1006         }
 1007         if (sctp_threshold_management(inp, stcb, net,
 1008             stcb->asoc.max_init_times)) {
 1009                 /* Association was destroyed */
 1010                 return (1);
 1011         }
 1012         stcb->asoc.dropped_special_cnt = 0;
 1013         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1014         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1015                 net->RTO = stcb->asoc.initial_init_rto_max;
 1016         }
 1017         if (stcb->asoc.numnets > 1) {
 1018                 /* If we have more than one addr use it */
 1019                 struct sctp_nets *alt;
 1020 
 1021                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1022                 if (alt != stcb->asoc.primary_destination) {
 1023                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1024                         stcb->asoc.primary_destination = alt;
 1025                 }
 1026         }
 1027         /* Send out a new init */
 1028         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1029         return (0);
 1030 }
 1031 
 1032 /*
 1033  * For cookie and asconf we actually need to find and mark for resend, then
 1034  * increment the resend counter (after all the threshold management stuff of
 1035  * course).
 1036  */
 1037 int
 1038 sctp_cookie_timer(struct sctp_inpcb *inp,
 1039     struct sctp_tcb *stcb,
 1040     struct sctp_nets *net SCTP_UNUSED)
 1041 {
 1042         struct sctp_nets *alt;
 1043         struct sctp_tmit_chunk *cookie;
 1044 
 1045         /* first before all else we must find the cookie */
 1046         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1047                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1048                         break;
 1049                 }
 1050         }
 1051         if (cookie == NULL) {
 1052                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 1053                         /* FOOBAR! */
 1054                         struct mbuf *oper;
 1055 
 1056                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 1057                             0, M_NOWAIT, 1, MT_DATA);
 1058                         if (oper) {
 1059                                 struct sctp_paramhdr *ph;
 1060                                 uint32_t *ippp;
 1061 
 1062                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 1063                                     sizeof(uint32_t);
 1064                                 ph = mtod(oper, struct sctp_paramhdr *);
 1065                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1066                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
 1067                                 ippp = (uint32_t *) (ph + 1);
 1068                                 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
 1069                         }
 1070                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4;
 1071                         sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
 1072                 } else {
 1073 #ifdef INVARIANTS
 1074                         panic("Cookie timer expires in wrong state?");
 1075 #else
 1076                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
 1077                         return (0);
 1078 #endif
 1079                 }
 1080                 return (0);
 1081         }
 1082         /* Ok we found the cookie, threshold management next */
 1083         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1084             stcb->asoc.max_init_times)) {
 1085                 /* Assoc is over */
 1086                 return (1);
 1087         }
 1088         /*
 1089          * cleared theshold management now lets backoff the address & select
 1090          * an alternate
 1091          */
 1092         stcb->asoc.dropped_special_cnt = 0;
 1093         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1094         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1095         if (alt != cookie->whoTo) {
 1096                 sctp_free_remote_addr(cookie->whoTo);
 1097                 cookie->whoTo = alt;
 1098                 atomic_add_int(&alt->ref_count, 1);
 1099         }
 1100         /* Now mark the retran info */
 1101         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1102                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1103         }
 1104         cookie->sent = SCTP_DATAGRAM_RESEND;
 1105         /*
 1106          * Now call the output routine to kick out the cookie again, Note we
 1107          * don't mark any chunks for retran so that FR will need to kick in
 1108          * to move these (or a send timer).
 1109          */
 1110         return (0);
 1111 }
 1112 
 1113 int
 1114 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1115     struct sctp_nets *net)
 1116 {
 1117         struct sctp_nets *alt;
 1118         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1119 
 1120         if (stcb->asoc.stream_reset_outstanding == 0) {
 1121                 return (0);
 1122         }
 1123         /* find the existing STRRESET, we use the seq number we sent out on */
 1124         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1125         if (strrst == NULL) {
 1126                 return (0);
 1127         }
 1128         /* do threshold management */
 1129         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
 1130             stcb->asoc.max_send_times)) {
 1131                 /* Assoc is over */
 1132                 return (1);
 1133         }
 1134         /*
 1135          * cleared theshold management now lets backoff the address & select
 1136          * an alternate
 1137          */
 1138         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
 1139         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
 1140         sctp_free_remote_addr(strrst->whoTo);
 1141         strrst->whoTo = alt;
 1142         atomic_add_int(&alt->ref_count, 1);
 1143 
 1144         /* See if a ECN Echo is also stranded */
 1145         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1146                 if ((chk->whoTo == net) &&
 1147                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1148                         sctp_free_remote_addr(chk->whoTo);
 1149                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1150                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1151                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1152                         }
 1153                         chk->whoTo = alt;
 1154                         atomic_add_int(&alt->ref_count, 1);
 1155                 }
 1156         }
 1157         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1158                 /*
 1159                  * If the address went un-reachable, we need to move to
 1160                  * alternates for ALL chk's in queue
 1161                  */
 1162                 sctp_move_chunks_from_net(stcb, net);
 1163         }
 1164         /* mark the retran info */
 1165         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1166                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1167         strrst->sent = SCTP_DATAGRAM_RESEND;
 1168 
 1169         /* restart the timer */
 1170         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 1171         return (0);
 1172 }
 1173 
 1174 int
 1175 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1176     struct sctp_nets *net)
 1177 {
 1178         struct sctp_nets *alt;
 1179         struct sctp_tmit_chunk *asconf, *chk;
 1180 
 1181         /* is this a first send, or a retransmission? */
 1182         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1183                 /* compose a new ASCONF chunk and send it */
 1184                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1185         } else {
 1186                 /*
 1187                  * Retransmission of the existing ASCONF is needed
 1188                  */
 1189 
 1190                 /* find the existing ASCONF */
 1191                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1192                 if (asconf == NULL) {
 1193                         return (0);
 1194                 }
 1195                 /* do threshold management */
 1196                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 1197                     stcb->asoc.max_send_times)) {
 1198                         /* Assoc is over */
 1199                         return (1);
 1200                 }
 1201                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1202                         /*
 1203                          * Something is rotten: our peer is not responding
 1204                          * to ASCONFs but apparently is to other chunks.
 1205                          * i.e. it is not properly handling the chunk type
 1206                          * upper bits. Mark this peer as ASCONF incapable
 1207                          * and cleanup.
 1208                          */
 1209                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1210                         sctp_asconf_cleanup(stcb, net);
 1211                         return (0);
 1212                 }
 1213                 /*
 1214                  * cleared threshold management, so now backoff the net and
 1215                  * select an alternate
 1216                  */
 1217                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 1218                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 1219                 if (asconf->whoTo != alt) {
 1220                         sctp_free_remote_addr(asconf->whoTo);
 1221                         asconf->whoTo = alt;
 1222                         atomic_add_int(&alt->ref_count, 1);
 1223                 }
 1224                 /* See if an ECN Echo is also stranded */
 1225                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1226                         if ((chk->whoTo == net) &&
 1227                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1228                                 sctp_free_remote_addr(chk->whoTo);
 1229                                 chk->whoTo = alt;
 1230                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1231                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1232                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1233                                 }
 1234                                 atomic_add_int(&alt->ref_count, 1);
 1235                         }
 1236                 }
 1237                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1238                         if (chk->whoTo != alt) {
 1239                                 sctp_free_remote_addr(chk->whoTo);
 1240                                 chk->whoTo = alt;
 1241                                 atomic_add_int(&alt->ref_count, 1);
 1242                         }
 1243                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1244                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1245                         chk->sent = SCTP_DATAGRAM_RESEND;
 1246                 }
 1247                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1248                         /*
 1249                          * If the address went un-reachable, we need to move
 1250                          * to the alternate for ALL chunks in queue
 1251                          */
 1252                         sctp_move_chunks_from_net(stcb, net);
 1253                 }
 1254                 /* mark the retran info */
 1255                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1256                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1257                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1258 
 1259                 /* send another ASCONF if any and we can do */
 1260                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1261         }
 1262         return (0);
 1263 }
 1264 
 1265 /* Mobility adaptation */
 1266 void
 1267 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1268     struct sctp_nets *net SCTP_UNUSED)
 1269 {
 1270         if (stcb->asoc.deleted_primary == NULL) {
 1271                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1272                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1273                 return;
 1274         }
 1275         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1276         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1277         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1278         stcb->asoc.deleted_primary = NULL;
 1279         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1280         return;
 1281 }
 1282 
 1283 /*
 1284  * For the shutdown and shutdown-ack, we do not keep one around on the
 1285  * control queue. This means we must generate a new one and call the general
 1286  * chunk output routine, AFTER having done threshold management.
 1287  * It is assumed that net is non-NULL.
 1288  */
 1289 int
 1290 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1291     struct sctp_nets *net)
 1292 {
 1293         struct sctp_nets *alt;
 1294 
 1295         /* first threshold managment */
 1296         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1297                 /* Assoc is over */
 1298                 return (1);
 1299         }
 1300         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1301         /* second select an alternative */
 1302         alt = sctp_find_alternate_net(stcb, net, 0);
 1303 
 1304         /* third generate a shutdown into the queue for out net */
 1305         sctp_send_shutdown(stcb, alt);
 1306 
 1307         /* fourth restart timer */
 1308         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1309         return (0);
 1310 }
 1311 
 1312 int
 1313 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1314     struct sctp_nets *net)
 1315 {
 1316         struct sctp_nets *alt;
 1317 
 1318         /* first threshold managment */
 1319         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1320                 /* Assoc is over */
 1321                 return (1);
 1322         }
 1323         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1324         /* second select an alternative */
 1325         alt = sctp_find_alternate_net(stcb, net, 0);
 1326 
 1327         /* third generate a shutdown into the queue for out net */
 1328         sctp_send_shutdown_ack(stcb, alt);
 1329 
 1330         /* fourth restart timer */
 1331         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1332         return (0);
 1333 }
 1334 
 1335 static void
 1336 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1337     struct sctp_tcb *stcb)
 1338 {
 1339         struct sctp_stream_queue_pending *sp;
 1340         unsigned int i, chks_in_queue = 0;
 1341         int being_filled = 0;
 1342 
 1343         /*
 1344          * This function is ONLY called when the send/sent queues are empty.
 1345          */
 1346         if ((stcb == NULL) || (inp == NULL))
 1347                 return;
 1348 
 1349         if (stcb->asoc.sent_queue_retran_cnt) {
 1350                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1351                     stcb->asoc.sent_queue_retran_cnt);
 1352                 stcb->asoc.sent_queue_retran_cnt = 0;
 1353         }
 1354         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1355                 /* No stream scheduler information, initialize scheduler */
 1356                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1357                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1358                         /* yep, we lost a stream or two */
 1359                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1360                 } else {
 1361                         /* no streams lost */
 1362                         stcb->asoc.total_output_queue_size = 0;
 1363                 }
 1364         }
 1365         /* Check to see if some data queued, if so report it */
 1366         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1367                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1368                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1369                                 if (sp->msg_is_complete)
 1370                                         being_filled++;
 1371                                 chks_in_queue++;
 1372                         }
 1373                 }
 1374         }
 1375         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1376                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1377                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1378         }
 1379         if (chks_in_queue) {
 1380                 /* call the output queue function */
 1381                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1382                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1383                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1384                         /*
 1385                          * Probably should go in and make it go back through
 1386                          * and add fragments allowed
 1387                          */
 1388                         if (being_filled == 0) {
 1389                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1390                                     chks_in_queue);
 1391                         }
 1392                 }
 1393         } else {
 1394                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1395                     (u_long)stcb->asoc.total_output_queue_size);
 1396                 stcb->asoc.total_output_queue_size = 0;
 1397         }
 1398 }
 1399 
 1400 int
 1401 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1402     struct sctp_nets *net)
 1403 {
 1404         uint8_t net_was_pf;
 1405 
 1406         if (net->dest_state & SCTP_ADDR_PF) {
 1407                 net_was_pf = 1;
 1408         } else {
 1409                 net_was_pf = 0;
 1410         }
 1411         if (net->hb_responded == 0) {
 1412                 if (net->ro._s_addr) {
 1413                         /*
 1414                          * Invalidate the src address if we did not get a
 1415                          * response last time.
 1416                          */
 1417                         sctp_free_ifa(net->ro._s_addr);
 1418                         net->ro._s_addr = NULL;
 1419                         net->src_addr_selected = 0;
 1420                 }
 1421                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1422                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1423                         /* Assoc is over */
 1424                         return (1);
 1425                 }
 1426         }
 1427         /* Zero PBA, if it needs it */
 1428         if (net->partial_bytes_acked) {
 1429                 net->partial_bytes_acked = 0;
 1430         }
 1431         if ((stcb->asoc.total_output_queue_size > 0) &&
 1432             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1433             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1434                 sctp_audit_stream_queues_for_size(inp, stcb);
 1435         }
 1436         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1437             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1438                 /*
 1439                  * when move to PF during threshold mangement, a HB has been
 1440                  * queued in that routine
 1441                  */
 1442                 uint32_t ms_gone_by;
 1443 
 1444                 if ((net->last_sent_time.tv_sec > 0) ||
 1445                     (net->last_sent_time.tv_usec > 0)) {
 1446                         struct timeval diff;
 1447 
 1448                         SCTP_GETTIME_TIMEVAL(&diff);
 1449                         timevalsub(&diff, &net->last_sent_time);
 1450                         ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
 1451                             (uint32_t) (diff.tv_usec / 1000);
 1452                 } else {
 1453                         ms_gone_by = 0xffffffff;
 1454                 }
 1455                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1456                     (net->dest_state & SCTP_ADDR_PF)) {
 1457                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1458                 }
 1459         }
 1460         return (0);
 1461 }
 1462 
 1463 void
 1464 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1465     struct sctp_tcb *stcb,
 1466     struct sctp_nets *net)
 1467 {
 1468         uint32_t next_mtu, mtu;
 1469 
 1470         next_mtu = sctp_get_next_mtu(net->mtu);
 1471 
 1472         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1473                 if ((net->src_addr_selected == 0) ||
 1474                     (net->ro._s_addr == NULL) ||
 1475                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1476                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1477                                 sctp_free_ifa(net->ro._s_addr);
 1478                                 net->ro._s_addr = NULL;
 1479                                 net->src_addr_selected = 0;
 1480                         } else if (net->ro._s_addr == NULL) {
 1481 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1482                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1483                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1484 
 1485                                         /* KAME hack: embed scopeid */
 1486                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1487                                 }
 1488 #endif
 1489 
 1490                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1491                                     stcb,
 1492                                     (sctp_route_t *) & net->ro,
 1493                                     net, 0, stcb->asoc.vrf_id);
 1494 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1495                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1496                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1497 
 1498                                         (void)sa6_recoverscope(sin6);
 1499                                 }
 1500 #endif                          /* INET6 */
 1501                         }
 1502                         if (net->ro._s_addr)
 1503                                 net->src_addr_selected = 1;
 1504                 }
 1505                 if (net->ro._s_addr) {
 1506                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1507                         if (net->port) {
 1508                                 mtu -= sizeof(struct udphdr);
 1509                         }
 1510                         if (mtu > next_mtu) {
 1511                                 net->mtu = next_mtu;
 1512                         }
 1513                 }
 1514         }
 1515         /* restart the timer */
 1516         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1517 }
 1518 
 1519 void
 1520 sctp_autoclose_timer(struct sctp_inpcb *inp,
 1521     struct sctp_tcb *stcb,
 1522     struct sctp_nets *net)
 1523 {
 1524         struct timeval tn, *tim_touse;
 1525         struct sctp_association *asoc;
 1526         int ticks_gone_by;
 1527 
 1528         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1529         if (stcb->asoc.sctp_autoclose_ticks &&
 1530             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1531                 /* Auto close is on */
 1532                 asoc = &stcb->asoc;
 1533                 /* pick the time to use */
 1534                 if (asoc->time_last_rcvd.tv_sec >
 1535                     asoc->time_last_sent.tv_sec) {
 1536                         tim_touse = &asoc->time_last_rcvd;
 1537                 } else {
 1538                         tim_touse = &asoc->time_last_sent;
 1539                 }
 1540                 /* Now has long enough transpired to autoclose? */
 1541                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 1542                 if ((ticks_gone_by > 0) &&
 1543                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
 1544                         /*
 1545                          * autoclose time has hit, call the output routine,
 1546                          * which should do nothing just to be SURE we don't
 1547                          * have hanging data. We can then safely check the
 1548                          * queues and know that we are clear to send
 1549                          * shutdown
 1550                          */
 1551                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1552                         /* Are we clean? */
 1553                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1554                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1555                                 /*
 1556                                  * there is nothing queued to send, so I'm
 1557                                  * done...
 1558                                  */
 1559                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1560                                         /* only send SHUTDOWN 1st time thru */
 1561                                         struct sctp_nets *netp;
 1562 
 1563                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 1564                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1565                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1566                                         }
 1567                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 1568                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 1569                                         sctp_stop_timers_for_shutdown(stcb);
 1570                                         if (stcb->asoc.alternate) {
 1571                                                 netp = stcb->asoc.alternate;
 1572                                         } else {
 1573                                                 netp = stcb->asoc.primary_destination;
 1574                                         }
 1575                                         sctp_send_shutdown(stcb, netp);
 1576                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1577                                             stcb->sctp_ep, stcb,
 1578                                             netp);
 1579                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1580                                             stcb->sctp_ep, stcb,
 1581                                             netp);
 1582                                 }
 1583                         }
 1584                 } else {
 1585                         /*
 1586                          * No auto close at this time, reset t-o to check
 1587                          * later
 1588                          */
 1589                         int tmp;
 1590 
 1591                         /* fool the timer startup to use the time left */
 1592                         tmp = asoc->sctp_autoclose_ticks;
 1593                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1594                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1595                             net);
 1596                         /* restore the real tick value */
 1597                         asoc->sctp_autoclose_ticks = tmp;
 1598                 }
 1599         }
 1600 }

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