sctp_timer.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #define _IP_VHL
   39 #include <netinet/sctp_os.h>
   40 #include <netinet/sctp_pcb.h>
   41 #ifdef INET6
   42 #endif
   43 #include <netinet/sctp_var.h>
   44 #include <netinet/sctp_sysctl.h>
   45 #include <netinet/sctp_timer.h>
   46 #include <netinet/sctputil.h>
   47 #include <netinet/sctp_output.h>
   48 #include <netinet/sctp_header.h>
   49 #include <netinet/sctp_indata.h>
   50 #include <netinet/sctp_asconf.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/sctp.h>
   53 #include <netinet/sctp_uio.h>
   54 #if defined(INET) || defined(INET6)
   55 #include <netinet/udp.h>
   56 #endif
   57 
   58 void
   59 sctp_audit_retranmission_queue(struct sctp_association *asoc)
   60 {
   61         struct sctp_tmit_chunk *chk;
   62 
   63         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
   64             asoc->sent_queue_retran_cnt,
   65             asoc->sent_queue_cnt);
   66         asoc->sent_queue_retran_cnt = 0;
   67         asoc->sent_queue_cnt = 0;
   68         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
   69                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   70                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   71                 }
   72                 asoc->sent_queue_cnt++;
   73         }
   74         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
   75                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   76                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   77                 }
   78         }
   79         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
   80                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   81                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   82                 }
   83         }
   84         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
   85             asoc->sent_queue_retran_cnt,
   86             asoc->sent_queue_cnt);
   87 }
   88 
   89 static int
   90 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   91     struct sctp_nets *net, uint16_t threshold)
   92 {
   93         if (net) {
   94                 net->error_count++;
   95                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
   96                     (void *)net, net->error_count,
   97                     net->failure_threshold);
   98                 if (net->error_count > net->failure_threshold) {
   99                         /* We had a threshold failure */
  100                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
  101                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
  102                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  103                                 net->dest_state &= ~SCTP_ADDR_PF;
  104                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  105                                     stcb, 0,
  106                                     (void *)net, SCTP_SO_NOT_LOCKED);
  107                         }
  108                 } else if ((net->pf_threshold < net->failure_threshold) &&
  109                     (net->error_count > net->pf_threshold)) {
  110                         if (!(net->dest_state & SCTP_ADDR_PF)) {
  111                                 net->dest_state |= SCTP_ADDR_PF;
  112                                 net->last_active = sctp_get_tick_count();
  113                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  114                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
  115                                     inp, stcb, net,
  116                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
  117                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
  118                         }
  119                 }
  120         }
  121         if (stcb == NULL)
  122                 return (0);
  123 
  124         if (net) {
  125                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
  126                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  127                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
  128                                     stcb->asoc.overall_error_count,
  129                                     (stcb->asoc.overall_error_count + 1),
  130                                     SCTP_FROM_SCTP_TIMER,
  131                                     __LINE__);
  132                         }
  133                         stcb->asoc.overall_error_count++;
  134                 }
  135         } else {
  136                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  137                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
  138                             stcb->asoc.overall_error_count,
  139                             (stcb->asoc.overall_error_count + 1),
  140                             SCTP_FROM_SCTP_TIMER,
  141                             __LINE__);
  142                 }
  143                 stcb->asoc.overall_error_count++;
  144         }
  145         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
  146             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
  147             (uint32_t)threshold,
  148             ((net == NULL) ? (uint32_t)0 : (uint32_t)net->dest_state));
  149         /*
  150          * We specifically do not do >= to give the assoc one more change
  151          * before we fail it.
  152          */
  153         if (stcb->asoc.overall_error_count > threshold) {
  154                 /* Abort notification sends a ULP notify */
  155                 struct mbuf *op_err;
  156 
  157                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
  158                     "Association error counter exceeded");
  159                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
  160                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
  161                 return (1);
  162         }
  163         return (0);
  164 }
  165 
  166 /*
  167  * sctp_find_alternate_net() returns a non-NULL pointer as long
  168  * the argument net is non-NULL.
  169  */
  170 struct sctp_nets *
  171 sctp_find_alternate_net(struct sctp_tcb *stcb,
  172     struct sctp_nets *net,
  173     int mode)
  174 {
  175         /* Find and return an alternate network if possible */
  176         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
  177         int once;
  178 
  179         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
  180         int min_errors = -1;
  181         uint32_t max_cwnd = 0;
  182 
  183         if (stcb->asoc.numnets == 1) {
  184                 /* No others but net */
  185                 return (TAILQ_FIRST(&stcb->asoc.nets));
  186         }
  187         /*
  188          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
  189          * net algorithm. This algorithm chooses the active destination (not
  190          * in PF state) with the largest cwnd value. If all destinations are
  191          * in PF state, unreachable, or unconfirmed, choose the desination
  192          * that is in PF state with the lowest error count. In case of a
  193          * tie, choose the destination that was most recently active.
  194          */
  195         if (mode == 2) {
  196                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  197                         /*
  198                          * JRS 5/14/07 - If the destination is unreachable
  199                          * or unconfirmed, skip it.
  200                          */
  201                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  202                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  203                                 continue;
  204                         }
  205                         /*
  206                          * JRS 5/14/07 -  If the destination is reachable
  207                          * but in PF state, compare the error count of the
  208                          * destination to the minimum error count seen thus
  209                          * far. Store the destination with the lower error
  210                          * count.  If the error counts are equal, store the
  211                          * destination that was most recently active.
  212                          */
  213                         if (mnet->dest_state & SCTP_ADDR_PF) {
  214                                 /*
  215                                  * JRS 5/14/07 - If the destination under
  216                                  * consideration is the current destination,
  217                                  * work as if the error count is one higher.
  218                                  * The actual error count will not be
  219                                  * incremented until later in the t3
  220                                  * handler.
  221                                  */
  222                                 if (mnet == net) {
  223                                         if (min_errors == -1) {
  224                                                 min_errors = mnet->error_count + 1;
  225                                                 min_errors_net = mnet;
  226                                         } else if (mnet->error_count + 1 < min_errors) {
  227                                                 min_errors = mnet->error_count + 1;
  228                                                 min_errors_net = mnet;
  229                                         } else if (mnet->error_count + 1 == min_errors
  230                                             && mnet->last_active > min_errors_net->last_active) {
  231                                                 min_errors_net = mnet;
  232                                                 min_errors = mnet->error_count + 1;
  233                                         }
  234                                         continue;
  235                                 } else {
  236                                         if (min_errors == -1) {
  237                                                 min_errors = mnet->error_count;
  238                                                 min_errors_net = mnet;
  239                                         } else if (mnet->error_count < min_errors) {
  240                                                 min_errors = mnet->error_count;
  241                                                 min_errors_net = mnet;
  242                                         } else if (mnet->error_count == min_errors
  243                                             && mnet->last_active > min_errors_net->last_active) {
  244                                                 min_errors_net = mnet;
  245                                                 min_errors = mnet->error_count;
  246                                         }
  247                                         continue;
  248                                 }
  249                         }
  250                         /*
  251                          * JRS 5/14/07 - If the destination is reachable and
  252                          * not in PF state, compare the cwnd of the
  253                          * destination to the highest cwnd seen thus far.
  254                          * Store the destination with the higher cwnd value.
  255                          * If the cwnd values are equal, randomly choose one
  256                          * of the two destinations.
  257                          */
  258                         if (max_cwnd < mnet->cwnd) {
  259                                 max_cwnd_net = mnet;
  260                                 max_cwnd = mnet->cwnd;
  261                         } else if (max_cwnd == mnet->cwnd) {
  262                                 uint32_t rndval;
  263                                 uint8_t this_random;
  264 
  265                                 if (stcb->asoc.hb_random_idx > 3) {
  266                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  267                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
  268                                         this_random = stcb->asoc.hb_random_values[0];
  269                                         stcb->asoc.hb_random_idx++;
  270                                         stcb->asoc.hb_ect_randombit = 0;
  271                                 } else {
  272                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  273                                         stcb->asoc.hb_random_idx++;
  274                                         stcb->asoc.hb_ect_randombit = 0;
  275                                 }
  276                                 if (this_random % 2 == 1) {
  277                                         max_cwnd_net = mnet;
  278                                         max_cwnd = mnet->cwnd;  /* Useless? */
  279                                 }
  280                         }
  281                 }
  282                 if (max_cwnd_net == NULL) {
  283                         if (min_errors_net == NULL) {
  284                                 return (net);
  285                         }
  286                         return (min_errors_net);
  287                 } else {
  288                         return (max_cwnd_net);
  289                 }
  290         }                       /* JRS 5/14/07 - If mode is set to 1, use the
  291                                  * CMT policy for choosing an alternate net. */
  292         else if (mode == 1) {
  293                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  294                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  295                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  296                                 /*
  297                                  * will skip ones that are not-reachable or
  298                                  * unconfirmed
  299                                  */
  300                                 continue;
  301                         }
  302                         if (max_cwnd < mnet->cwnd) {
  303                                 max_cwnd_net = mnet;
  304                                 max_cwnd = mnet->cwnd;
  305                         } else if (max_cwnd == mnet->cwnd) {
  306                                 uint32_t rndval;
  307                                 uint8_t this_random;
  308 
  309                                 if (stcb->asoc.hb_random_idx > 3) {
  310                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  311                                         memcpy(stcb->asoc.hb_random_values, &rndval,
  312                                             sizeof(stcb->asoc.hb_random_values));
  313                                         this_random = stcb->asoc.hb_random_values[0];
  314                                         stcb->asoc.hb_random_idx = 0;
  315                                         stcb->asoc.hb_ect_randombit = 0;
  316                                 } else {
  317                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  318                                         stcb->asoc.hb_random_idx++;
  319                                         stcb->asoc.hb_ect_randombit = 0;
  320                                 }
  321                                 if (this_random % 2) {
  322                                         max_cwnd_net = mnet;
  323                                         max_cwnd = mnet->cwnd;
  324                                 }
  325                         }
  326                 }
  327                 if (max_cwnd_net) {
  328                         return (max_cwnd_net);
  329                 }
  330         }
  331         mnet = net;
  332         once = 0;
  333 
  334         if (mnet == NULL) {
  335                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
  336                 if (mnet == NULL) {
  337                         return (NULL);
  338                 }
  339         }
  340         for (;;) {
  341                 alt = TAILQ_NEXT(mnet, sctp_next);
  342                 if (alt == NULL) {
  343                         once++;
  344                         if (once > 1) {
  345                                 break;
  346                         }
  347                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  348                         if (alt == NULL) {
  349                                 return (NULL);
  350                         }
  351                 }
  352                 if (alt->ro.ro_rt == NULL) {
  353                         if (alt->ro._s_addr) {
  354                                 sctp_free_ifa(alt->ro._s_addr);
  355                                 alt->ro._s_addr = NULL;
  356                         }
  357                         alt->src_addr_selected = 0;
  358                 }
  359                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
  360                     (alt->ro.ro_rt != NULL) &&
  361                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
  362                         /* Found a reachable address */
  363                         break;
  364                 }
  365                 mnet = alt;
  366         }
  367 
  368         if (alt == NULL) {
  369                 /* Case where NO insv network exists (dormant state) */
  370                 /* we rotate destinations */
  371                 once = 0;
  372                 mnet = net;
  373                 for (;;) {
  374                         if (mnet == NULL) {
  375                                 return (TAILQ_FIRST(&stcb->asoc.nets));
  376                         }
  377                         alt = TAILQ_NEXT(mnet, sctp_next);
  378                         if (alt == NULL) {
  379                                 once++;
  380                                 if (once > 1) {
  381                                         break;
  382                                 }
  383                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
  384                                 if (alt == NULL) {
  385                                         break;
  386                                 }
  387                         }
  388                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  389                             (alt != net)) {
  390                                 /* Found an alternate address */
  391                                 break;
  392                         }
  393                         mnet = alt;
  394                 }
  395         }
  396         if (alt == NULL) {
  397                 return (net);
  398         }
  399         return (alt);
  400 }
  401 
  402 static void
  403 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
  404     struct sctp_nets *net,
  405     int win_probe,
  406     int num_marked, int num_abandoned)
  407 {
  408         if (net->RTO == 0) {
  409                 if (net->RTO_measured) {
  410                         net->RTO = stcb->asoc.minrto;
  411                 } else {
  412                         net->RTO = stcb->asoc.initial_rto;
  413                 }
  414         }
  415         net->RTO <<= 1;
  416         if (net->RTO > stcb->asoc.maxrto) {
  417                 net->RTO = stcb->asoc.maxrto;
  418         }
  419         if ((win_probe == 0) && (num_marked || num_abandoned)) {
  420                 /* We don't apply penalty to window probe scenarios */
  421                 /* JRS - Use the congestion control given in the CC module */
  422                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
  423         }
  424 }
  425 
  426 #ifndef INVARIANTS
  427 static void
  428 sctp_recover_sent_list(struct sctp_tcb *stcb)
  429 {
  430         struct sctp_tmit_chunk *chk, *nchk;
  431         struct sctp_association *asoc;
  432 
  433         asoc = &stcb->asoc;
  434         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  435                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
  436                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
  437                             (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
  438                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
  439                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
  440                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
  441                                 }
  442                         }
  443                         if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
  444                             (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
  445                             TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
  446                                 asoc->trigger_reset = 1;
  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->prsctp_supported && 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);
  469         }
  470 }
  471 #endif
  472 
  473 static int
  474 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
  475     struct sctp_nets *net,
  476     struct sctp_nets *alt,
  477     int window_probe,
  478     int *num_marked,
  479     int *num_abandoned)
  480 {
  481 
  482         /*
  483          * Mark all chunks (well not all) that were sent to *net for
  484          * retransmission. Move them to alt for there destination as well...
  485          * We only mark chunks that have been outstanding long enough to
  486          * have received feed-back.
  487          */
  488         struct sctp_tmit_chunk *chk, *nchk;
  489         struct sctp_nets *lnets;
  490         struct timeval now, min_wait, tv;
  491         int cur_rto;
  492         int cnt_abandoned;
  493         int audit_tf, num_mk, fir;
  494         unsigned int cnt_mk;
  495         uint32_t orig_flight, orig_tf;
  496         uint32_t tsnlast, tsnfirst;
  497 #ifndef INVARIANTS
  498         int recovery_cnt = 0;
  499 #endif
  500 
  501 
  502         /* none in flight now */
  503         audit_tf = 0;
  504         fir = 0;
  505         /*
  506          * figure out how long a data chunk must be pending before we can
  507          * mark it ..
  508          */
  509         (void)SCTP_GETTIME_TIMEVAL(&now);
  510         /* get cur rto in micro-seconds */
  511         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
  512         cur_rto *= 1000;
  513         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  514                 sctp_log_fr(cur_rto,
  515                     stcb->asoc.peers_rwnd,
  516                     window_probe,
  517                     SCTP_FR_T3_MARK_TIME);
  518                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
  519                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
  520         }
  521         tv.tv_sec = cur_rto / 1000000;
  522         tv.tv_usec = cur_rto % 1000000;
  523         min_wait = now;
  524         timevalsub(&min_wait, &tv);
  525         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
  526                 /*
  527                  * if we hit here, we don't have enough seconds on the clock
  528                  * to account for the RTO. We just let the lower seconds be
  529                  * the bounds and don't worry about it. This may mean we
  530                  * will mark a lot more than we should.
  531                  */
  532                 min_wait.tv_sec = min_wait.tv_usec = 0;
  533         }
  534         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  535                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
  536                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
  537         }
  538         /*
  539          * Our rwnd will be incorrect here since we are not adding back the
  540          * cnt * mbuf but we will fix that down below.
  541          */
  542         orig_flight = net->flight_size;
  543         orig_tf = stcb->asoc.total_flight;
  544 
  545         net->fast_retran_ip = 0;
  546         /* Now on to each chunk */
  547         cnt_abandoned = 0;
  548         num_mk = cnt_mk = 0;
  549         tsnfirst = tsnlast = 0;
  550 #ifndef INVARIANTS
  551 start_again:
  552 #endif
  553         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
  554                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
  555                         /* Strange case our list got out of order? */
  556                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
  557                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
  558 #ifdef INVARIANTS
  559                         panic("last acked >= chk on sent-Q");
  560 #else
  561                         recovery_cnt++;
  562                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
  563                         sctp_recover_sent_list(stcb);
  564                         if (recovery_cnt < 10) {
  565                                 goto start_again;
  566                         } else {
  567                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
  568                         }
  569 #endif
  570                 }
  571                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
  572                         /*
  573                          * found one to mark: If it is less than
  574                          * DATAGRAM_ACKED it MUST not be a skipped or marked
  575                          * TSN but instead one that is either already set
  576                          * for retransmission OR one that needs
  577                          * retransmission.
  578                          */
  579 
  580                         /* validate its been outstanding long enough */
  581                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  582                                 sctp_log_fr(chk->rec.data.tsn,
  583                                     chk->sent_rcv_time.tv_sec,
  584                                     chk->sent_rcv_time.tv_usec,
  585                                     SCTP_FR_T3_MARK_TIME);
  586                         }
  587                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
  588                                 /*
  589                                  * we have reached a chunk that was sent
  590                                  * some seconds past our min.. forget it we
  591                                  * will find no more to send.
  592                                  */
  593                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  594                                         sctp_log_fr(0,
  595                                             chk->sent_rcv_time.tv_sec,
  596                                             chk->sent_rcv_time.tv_usec,
  597                                             SCTP_FR_T3_STOPPED);
  598                                 }
  599                                 continue;
  600                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
  601                             (window_probe == 0)) {
  602                                 /*
  603                                  * we must look at the micro seconds to
  604                                  * know.
  605                                  */
  606                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
  607                                         /*
  608                                          * ok it was sent after our boundary
  609                                          * time.
  610                                          */
  611                                         continue;
  612                                 }
  613                         }
  614                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
  615                                 /* Is it expired? */
  616                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
  617                                         /* Yes so drop it */
  618                                         if (chk->data) {
  619                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  620                                                     chk,
  621                                                     1,
  622                                                     SCTP_SO_NOT_LOCKED);
  623                                                 cnt_abandoned++;
  624                                         }
  625                                         continue;
  626                                 }
  627                         }
  628                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
  629                                 /* Has it been retransmitted tv_sec times? */
  630                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
  631                                         if (chk->data) {
  632                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  633                                                     chk,
  634                                                     1,
  635                                                     SCTP_SO_NOT_LOCKED);
  636                                                 cnt_abandoned++;
  637                                         }
  638                                         continue;
  639                                 }
  640                         }
  641                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  642                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  643                                 num_mk++;
  644                                 if (fir == 0) {
  645                                         fir = 1;
  646                                         tsnfirst = chk->rec.data.tsn;
  647                                 }
  648                                 tsnlast = chk->rec.data.tsn;
  649                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  650                                         sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
  651                                             0, SCTP_FR_T3_MARKED);
  652                                 }
  653 
  654                                 if (chk->rec.data.chunk_was_revoked) {
  655                                         /* deflate the cwnd */
  656                                         chk->whoTo->cwnd -= chk->book_size;
  657                                         chk->rec.data.chunk_was_revoked = 0;
  658                                 }
  659                                 net->marked_retrans++;
  660                                 stcb->asoc.marked_retrans++;
  661                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  662                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  663                                             chk->whoTo->flight_size,
  664                                             chk->book_size,
  665                                             (uint32_t)(uintptr_t)chk->whoTo,
  666                                             chk->rec.data.tsn);
  667                                 }
  668                                 sctp_flight_size_decrease(chk);
  669                                 sctp_total_flight_decrease(stcb, chk);
  670                                 stcb->asoc.peers_rwnd += chk->send_size;
  671                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  672                         }
  673                         chk->sent = SCTP_DATAGRAM_RESEND;
  674                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  675                         SCTP_STAT_INCR(sctps_markedretrans);
  676 
  677                         /* reset the TSN for striking and other FR stuff */
  678                         chk->rec.data.doing_fast_retransmit = 0;
  679                         /* Clear any time so NO RTT is being done */
  680 
  681                         if (chk->do_rtt) {
  682                                 if (chk->whoTo->rto_needed == 0) {
  683                                         chk->whoTo->rto_needed = 1;
  684                                 }
  685                         }
  686                         chk->do_rtt = 0;
  687                         if (alt != net) {
  688                                 sctp_free_remote_addr(chk->whoTo);
  689                                 chk->no_fr_allowed = 1;
  690                                 chk->whoTo = alt;
  691                                 atomic_add_int(&alt->ref_count, 1);
  692                         } else {
  693                                 chk->no_fr_allowed = 0;
  694                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  695                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  696                                 } else {
  697                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
  698                                 }
  699                         }
  700                         /*
  701                          * CMT: Do not allow FRs on retransmitted TSNs.
  702                          */
  703                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  704                                 chk->no_fr_allowed = 1;
  705                         }
  706 #ifdef THIS_SHOULD_NOT_BE_DONE
  707                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  708                         /* remember highest acked one */
  709                         could_be_sent = chk;
  710 #endif
  711                 }
  712                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  713                         cnt_mk++;
  714                 }
  715         }
  716         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  717                 /* we did not subtract the same things? */
  718                 audit_tf = 1;
  719         }
  720 
  721         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  722                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  723         }
  724 #ifdef SCTP_DEBUG
  725         if (num_mk) {
  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:%u\n",
  729                     num_mk,
  730                     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                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  750                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  751                                 cnt_mk++;
  752                         }
  753                         atomic_add_int(&alt->ref_count, 1);
  754                 }
  755         }
  756 #ifdef THIS_SHOULD_NOT_BE_DONE
  757         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  758                 /* fix it so we retransmit the highest acked anyway */
  759                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  760                 cnt_mk++;
  761                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  762         }
  763 #endif
  764         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  765 #ifdef INVARIANTS
  766                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  767                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  768 #endif
  769 #ifndef SCTP_AUDITING_ENABLED
  770                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  771 #endif
  772         }
  773         if (audit_tf) {
  774                 SCTPDBG(SCTP_DEBUG_TIMER4,
  775                     "Audit total flight due to negative value net:%p\n",
  776                     (void *)net);
  777                 stcb->asoc.total_flight = 0;
  778                 stcb->asoc.total_flight_count = 0;
  779                 /* Clear all networks flight size */
  780                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  781                         lnets->flight_size = 0;
  782                         SCTPDBG(SCTP_DEBUG_TIMER4,
  783                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  784                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
  785                 }
  786                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  787                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  788                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  789                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  790                                             chk->whoTo->flight_size,
  791                                             chk->book_size,
  792                                             (uint32_t)(uintptr_t)chk->whoTo,
  793                                             chk->rec.data.tsn);
  794                                 }
  795 
  796                                 sctp_flight_size_increase(chk);
  797                                 sctp_total_flight_increase(stcb, chk);
  798                         }
  799                 }
  800         }
  801         /* We return 1 if we only have a window probe outstanding */
  802         return (0);
  803 }
  804 
  805 
  806 int
  807 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  808     struct sctp_tcb *stcb,
  809     struct sctp_nets *net)
  810 {
  811         struct sctp_nets *alt;
  812         int win_probe, num_mk, num_abandoned;
  813 
  814         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  815                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  816         }
  817         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  818                 struct sctp_nets *lnet;
  819 
  820                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  821                         if (net == lnet) {
  822                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  823                         } else {
  824                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  825                         }
  826                 }
  827         }
  828         /* Find an alternate and mark those for retransmission */
  829         if ((stcb->asoc.peers_rwnd == 0) &&
  830             (stcb->asoc.total_flight < net->mtu)) {
  831                 SCTP_STAT_INCR(sctps_timowindowprobe);
  832                 win_probe = 1;
  833         } else {
  834                 win_probe = 0;
  835         }
  836 
  837         if (win_probe == 0) {
  838                 /* We don't do normal threshold management on window probes */
  839                 if (sctp_threshold_management(inp, stcb, net,
  840                     stcb->asoc.max_send_times)) {
  841                         /* Association was destroyed */
  842                         return (1);
  843                 } else {
  844                         if (net != stcb->asoc.primary_destination) {
  845                                 /* send a immediate HB if our RTO is stale */
  846                                 struct timeval now;
  847                                 unsigned int ms_goneby;
  848 
  849                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  850                                 if (net->last_sent_time.tv_sec) {
  851                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  852                                 } else {
  853                                         ms_goneby = 0;
  854                                 }
  855                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  856                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  857                                                 /*
  858                                                  * no recent feed back in an
  859                                                  * RTO or more, request a
  860                                                  * RTT update
  861                                                  */
  862                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  863                                         }
  864                                 }
  865                         }
  866                 }
  867         } else {
  868                 /*
  869                  * For a window probe we don't penalize the net's but only
  870                  * the association. This may fail it if SACKs are not coming
  871                  * back. If sack's are coming with rwnd locked at 0, we will
  872                  * continue to hold things waiting for rwnd to raise
  873                  */
  874                 if (sctp_threshold_management(inp, stcb, NULL,
  875                     stcb->asoc.max_send_times)) {
  876                         /* Association was destroyed */
  877                         return (1);
  878                 }
  879         }
  880         if (stcb->asoc.sctp_cmt_on_off > 0) {
  881                 if (net->pf_threshold < net->failure_threshold) {
  882                         alt = sctp_find_alternate_net(stcb, net, 2);
  883                 } else {
  884                         /*
  885                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  886                          * being used, then pick dest with largest ssthresh
  887                          * for any retransmission.
  888                          */
  889                         alt = sctp_find_alternate_net(stcb, net, 1);
  890                         /*
  891                          * CUCv2: If a different dest is picked for the
  892                          * retransmission, then new (rtx-)pseudo_cumack
  893                          * needs to be tracked for orig dest. Let CUCv2
  894                          * track new (rtx-) pseudo-cumack always.
  895                          */
  896                         net->find_pseudo_cumack = 1;
  897                         net->find_rtx_pseudo_cumack = 1;
  898                 }
  899         } else {
  900                 alt = sctp_find_alternate_net(stcb, net, 0);
  901         }
  902 
  903         num_mk = 0;
  904         num_abandoned = 0;
  905         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  906             &num_mk, &num_abandoned);
  907         /* FR Loss recovery just ended with the T3. */
  908         stcb->asoc.fast_retran_loss_recovery = 0;
  909 
  910         /* CMT FR loss recovery ended with the T3 */
  911         net->fast_retran_loss_recovery = 0;
  912         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  913             (net->flight_size == 0)) {
  914                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  915         }
  916 
  917         /*
  918          * setup the sat loss recovery that prevents satellite cwnd advance.
  919          */
  920         stcb->asoc.sat_t3_loss_recovery = 1;
  921         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  922 
  923         /* Backoff the timer and cwnd */
  924         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  925         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  926             (net->dest_state & SCTP_ADDR_PF)) {
  927                 /* Move all pending over too */
  928                 sctp_move_chunks_from_net(stcb, net);
  929 
  930                 /*
  931                  * Get the address that failed, to force a new src address
  932                  * selecton and a route allocation.
  933                  */
  934                 if (net->ro._s_addr) {
  935                         sctp_free_ifa(net->ro._s_addr);
  936                         net->ro._s_addr = NULL;
  937                 }
  938                 net->src_addr_selected = 0;
  939 
  940                 /* Force a route allocation too */
  941                 if (net->ro.ro_rt) {
  942                         RTFREE(net->ro.ro_rt);
  943                         net->ro.ro_rt = NULL;
  944                 }
  945 
  946                 /* Was it our primary? */
  947                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  948                         /*
  949                          * Yes, note it as such and find an alternate note:
  950                          * this means HB code must use this to resent the
  951                          * primary if it goes active AND if someone does a
  952                          * change-primary then this flag must be cleared
  953                          * from any net structures.
  954                          */
  955                         if (stcb->asoc.alternate) {
  956                                 sctp_free_remote_addr(stcb->asoc.alternate);
  957                         }
  958                         stcb->asoc.alternate = alt;
  959                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  960                 }
  961         }
  962         /*
  963          * Special case for cookie-echo'ed case, we don't do output but must
  964          * await the COOKIE-ACK before retransmission
  965          */
  966         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
  967                 /*
  968                  * Here we just reset the timer and start again since we
  969                  * have not established the asoc
  970                  */
  971                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  972                 return (0);
  973         }
  974         if (stcb->asoc.prsctp_supported) {
  975                 struct sctp_tmit_chunk *lchk;
  976 
  977                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  978                 /* C3. See if we need to send a Fwd-TSN */
  979                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  980                         send_forward_tsn(stcb, &stcb->asoc);
  981                         for (; lchk != NULL; lchk = TAILQ_NEXT(lchk, sctp_next)) {
  982                                 if (lchk->whoTo != NULL) {
  983                                         break;
  984                                 }
  985                         }
  986                         if (lchk != NULL) {
  987                                 /* Assure a timer is up */
  988                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  989                         }
  990                 }
  991         }
  992         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  993                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  994         }
  995         return (0);
  996 }
  997 
  998 int
  999 sctp_t1init_timer(struct sctp_inpcb *inp,
 1000     struct sctp_tcb *stcb,
 1001     struct sctp_nets *net)
 1002 {
 1003         /* bump the thresholds */
 1004         if (stcb->asoc.delayed_connection) {
 1005                 /*
 1006                  * special hook for delayed connection. The library did NOT
 1007                  * complete the rest of its sends.
 1008                  */
 1009                 stcb->asoc.delayed_connection = 0;
 1010                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1011                 return (0);
 1012         }
 1013         if (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT) {
 1014                 return (0);
 1015         }
 1016         if (sctp_threshold_management(inp, stcb, net,
 1017             stcb->asoc.max_init_times)) {
 1018                 /* Association was destroyed */
 1019                 return (1);
 1020         }
 1021         stcb->asoc.dropped_special_cnt = 0;
 1022         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1023         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1024                 net->RTO = stcb->asoc.initial_init_rto_max;
 1025         }
 1026         if (stcb->asoc.numnets > 1) {
 1027                 /* If we have more than one addr use it */
 1028                 struct sctp_nets *alt;
 1029 
 1030                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1031                 if (alt != stcb->asoc.primary_destination) {
 1032                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1033                         stcb->asoc.primary_destination = alt;
 1034                 }
 1035         }
 1036         /* Send out a new init */
 1037         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1038         return (0);
 1039 }
 1040 
 1041 /*
 1042  * For cookie and asconf we actually need to find and mark for resend, then
 1043  * increment the resend counter (after all the threshold management stuff of
 1044  * course).
 1045  */
 1046 int
 1047 sctp_cookie_timer(struct sctp_inpcb *inp,
 1048     struct sctp_tcb *stcb,
 1049     struct sctp_nets *net SCTP_UNUSED)
 1050 {
 1051         struct sctp_nets *alt;
 1052         struct sctp_tmit_chunk *cookie;
 1053 
 1054         /* first before all else we must find the cookie */
 1055         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1056                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1057                         break;
 1058                 }
 1059         }
 1060         if (cookie == NULL) {
 1061                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 1062                         /* FOOBAR! */
 1063                         struct mbuf *op_err;
 1064 
 1065                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 1066                             "Cookie timer expired, but no cookie");
 1067                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
 1068                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 1069                 } else {
 1070 #ifdef INVARIANTS
 1071                         panic("Cookie timer expires in wrong state?");
 1072 #else
 1073                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(stcb));
 1074                         return (0);
 1075 #endif
 1076                 }
 1077                 return (0);
 1078         }
 1079         /* Ok we found the cookie, threshold management next */
 1080         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1081             stcb->asoc.max_init_times)) {
 1082                 /* Assoc is over */
 1083                 return (1);
 1084         }
 1085         /*
 1086          * Cleared threshold management, now lets backoff the address and
 1087          * select an alternate
 1088          */
 1089         stcb->asoc.dropped_special_cnt = 0;
 1090         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1091         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1092         if (alt != cookie->whoTo) {
 1093                 sctp_free_remote_addr(cookie->whoTo);
 1094                 cookie->whoTo = alt;
 1095                 atomic_add_int(&alt->ref_count, 1);
 1096         }
 1097         /* Now mark the retran info */
 1098         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1099                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1100         }
 1101         cookie->sent = SCTP_DATAGRAM_RESEND;
 1102         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1103         /*
 1104          * Now call the output routine to kick out the cookie again, Note we
 1105          * don't mark any chunks for retran so that FR will need to kick in
 1106          * to move these (or a send timer).
 1107          */
 1108         return (0);
 1109 }
 1110 
 1111 int
 1112 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
 1113 {
 1114         struct sctp_nets *alt, *net;
 1115         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1116 
 1117         if (stcb->asoc.stream_reset_outstanding == 0) {
 1118                 return (0);
 1119         }
 1120         /* find the existing STRRESET, we use the seq number we sent out on */
 1121         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1122         if (strrst == NULL) {
 1123                 return (0);
 1124         }
 1125         net = strrst->whoTo;
 1126         /* do threshold management */
 1127         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1128                 /* Assoc is over */
 1129                 return (1);
 1130         }
 1131         /*
 1132          * Cleared threshold management, now lets backoff the address and
 1133          * select an alternate
 1134          */
 1135         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1136         alt = sctp_find_alternate_net(stcb, net, 0);
 1137         strrst->whoTo = alt;
 1138         atomic_add_int(&alt->ref_count, 1);
 1139 
 1140         /* See if a ECN Echo is also stranded */
 1141         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1142                 if ((chk->whoTo == net) &&
 1143                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1144                         sctp_free_remote_addr(chk->whoTo);
 1145                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1146                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1147                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1148                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1149                         }
 1150                         chk->whoTo = alt;
 1151                         atomic_add_int(&alt->ref_count, 1);
 1152                 }
 1153         }
 1154         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1155                 /*
 1156                  * If the address went un-reachable, we need to move to
 1157                  * alternates for ALL chk's in queue
 1158                  */
 1159                 sctp_move_chunks_from_net(stcb, net);
 1160         }
 1161         sctp_free_remote_addr(net);
 1162 
 1163         /* mark the retran info */
 1164         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1165                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1166         strrst->sent = SCTP_DATAGRAM_RESEND;
 1167         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1168 
 1169         /* restart the timer */
 1170         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, alt);
 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                 net = asconf->whoTo;
 1196                 /* do threshold management */
 1197                 if (sctp_threshold_management(inp, stcb, net,
 1198                     stcb->asoc.max_send_times)) {
 1199                         /* Assoc is over */
 1200                         return (1);
 1201                 }
 1202                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1203                         /*
 1204                          * Something is rotten: our peer is not responding
 1205                          * to ASCONFs but apparently is to other chunks.
 1206                          * i.e. it is not properly handling the chunk type
 1207                          * upper bits. Mark this peer as ASCONF incapable
 1208                          * and cleanup.
 1209                          */
 1210                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1211                         sctp_asconf_cleanup(stcb);
 1212                         return (0);
 1213                 }
 1214                 /*
 1215                  * cleared threshold management, so now backoff the net and
 1216                  * select an alternate
 1217                  */
 1218                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1219                 alt = sctp_find_alternate_net(stcb, net, 0);
 1220                 if (asconf->whoTo != alt) {
 1221                         asconf->whoTo = alt;
 1222                         atomic_add_int(&alt->ref_count, 1);
 1223                 }
 1224 
 1225                 /* See if an ECN Echo is also stranded */
 1226                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1227                         if ((chk->whoTo == net) &&
 1228                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1229                                 sctp_free_remote_addr(chk->whoTo);
 1230                                 chk->whoTo = alt;
 1231                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1232                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1233                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1234                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1235                                 }
 1236                                 atomic_add_int(&alt->ref_count, 1);
 1237                         }
 1238                 }
 1239                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1240                         if (chk->whoTo != alt) {
 1241                                 sctp_free_remote_addr(chk->whoTo);
 1242                                 chk->whoTo = alt;
 1243                                 atomic_add_int(&alt->ref_count, 1);
 1244                         }
 1245                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1246                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1247                         chk->sent = SCTP_DATAGRAM_RESEND;
 1248                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1249                 }
 1250                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1251                         /*
 1252                          * If the address went un-reachable, we need to move
 1253                          * to the alternate for ALL chunks in queue
 1254                          */
 1255                         sctp_move_chunks_from_net(stcb, net);
 1256                 }
 1257                 sctp_free_remote_addr(net);
 1258 
 1259                 /* mark the retran info */
 1260                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1261                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1262                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1263                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1264 
 1265                 /* send another ASCONF if any and we can do */
 1266                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1267         }
 1268         return (0);
 1269 }
 1270 
 1271 /* Mobility adaptation */
 1272 void
 1273 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
 1274 {
 1275         if (stcb->asoc.deleted_primary == NULL) {
 1276                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1277                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1278                 return;
 1279         }
 1280         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1281         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1282         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1283         stcb->asoc.deleted_primary = NULL;
 1284         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1285         return;
 1286 }
 1287 
 1288 /*
 1289  * For the shutdown and shutdown-ack, we do not keep one around on the
 1290  * control queue. This means we must generate a new one and call the general
 1291  * chunk output routine, AFTER having done threshold management.
 1292  * It is assumed that net is non-NULL.
 1293  */
 1294 int
 1295 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1296     struct sctp_nets *net)
 1297 {
 1298         struct sctp_nets *alt;
 1299 
 1300         /* first threshold management */
 1301         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1302                 /* Assoc is over */
 1303                 return (1);
 1304         }
 1305         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1306         /* second select an alternative */
 1307         alt = sctp_find_alternate_net(stcb, net, 0);
 1308 
 1309         /* third generate a shutdown into the queue for out net */
 1310         sctp_send_shutdown(stcb, alt);
 1311 
 1312         /* fourth restart timer */
 1313         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1314         return (0);
 1315 }
 1316 
 1317 int
 1318 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1319     struct sctp_nets *net)
 1320 {
 1321         struct sctp_nets *alt;
 1322 
 1323         /* first threshold management */
 1324         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1325                 /* Assoc is over */
 1326                 return (1);
 1327         }
 1328         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1329         /* second select an alternative */
 1330         alt = sctp_find_alternate_net(stcb, net, 0);
 1331 
 1332         /* third generate a shutdown into the queue for out net */
 1333         sctp_send_shutdown_ack(stcb, alt);
 1334 
 1335         /* fourth restart timer */
 1336         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1337         return (0);
 1338 }
 1339 
 1340 static void
 1341 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1342     struct sctp_tcb *stcb)
 1343 {
 1344         struct sctp_stream_queue_pending *sp;
 1345         unsigned int i, chks_in_queue = 0;
 1346         int being_filled = 0;
 1347 
 1348         /*
 1349          * This function is ONLY called when the send/sent queues are empty.
 1350          */
 1351         if ((stcb == NULL) || (inp == NULL))
 1352                 return;
 1353 
 1354         if (stcb->asoc.sent_queue_retran_cnt) {
 1355                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1356                     stcb->asoc.sent_queue_retran_cnt);
 1357                 stcb->asoc.sent_queue_retran_cnt = 0;
 1358         }
 1359         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1360                 /* No stream scheduler information, initialize scheduler */
 1361                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1362                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1363                         /* yep, we lost a stream or two */
 1364                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1365                 } else {
 1366                         /* no streams lost */
 1367                         stcb->asoc.total_output_queue_size = 0;
 1368                 }
 1369         }
 1370         /* Check to see if some data queued, if so report it */
 1371         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1372                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1373                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1374                                 if (sp->msg_is_complete)
 1375                                         being_filled++;
 1376                                 chks_in_queue++;
 1377                         }
 1378                 }
 1379         }
 1380         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1381                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1382                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1383         }
 1384         if (chks_in_queue) {
 1385                 /* call the output queue function */
 1386                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1387                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1388                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1389                         /*
 1390                          * Probably should go in and make it go back through
 1391                          * and add fragments allowed
 1392                          */
 1393                         if (being_filled == 0) {
 1394                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1395                                     chks_in_queue);
 1396                         }
 1397                 }
 1398         } else {
 1399                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1400                     (u_long)stcb->asoc.total_output_queue_size);
 1401                 stcb->asoc.total_output_queue_size = 0;
 1402         }
 1403 }
 1404 
 1405 int
 1406 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1407     struct sctp_nets *net)
 1408 {
 1409         uint8_t net_was_pf;
 1410 
 1411         if (net->dest_state & SCTP_ADDR_PF) {
 1412                 net_was_pf = 1;
 1413         } else {
 1414                 net_was_pf = 0;
 1415         }
 1416         if (net->hb_responded == 0) {
 1417                 if (net->ro._s_addr) {
 1418                         /*
 1419                          * Invalidate the src address if we did not get a
 1420                          * response last time.
 1421                          */
 1422                         sctp_free_ifa(net->ro._s_addr);
 1423                         net->ro._s_addr = NULL;
 1424                         net->src_addr_selected = 0;
 1425                 }
 1426                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1427                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1428                         /* Assoc is over */
 1429                         return (1);
 1430                 }
 1431         }
 1432         /* Zero PBA, if it needs it */
 1433         if (net->partial_bytes_acked) {
 1434                 net->partial_bytes_acked = 0;
 1435         }
 1436         if ((stcb->asoc.total_output_queue_size > 0) &&
 1437             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1438             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1439                 sctp_audit_stream_queues_for_size(inp, stcb);
 1440         }
 1441         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1442             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1443                 /*
 1444                  * when move to PF during threshold mangement, a HB has been
 1445                  * queued in that routine
 1446                  */
 1447                 uint32_t ms_gone_by;
 1448 
 1449                 if ((net->last_sent_time.tv_sec > 0) ||
 1450                     (net->last_sent_time.tv_usec > 0)) {
 1451                         struct timeval diff;
 1452 
 1453                         SCTP_GETTIME_TIMEVAL(&diff);
 1454                         timevalsub(&diff, &net->last_sent_time);
 1455                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
 1456                             (uint32_t)(diff.tv_usec / 1000);
 1457                 } else {
 1458                         ms_gone_by = 0xffffffff;
 1459                 }
 1460                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1461                     (net->dest_state & SCTP_ADDR_PF)) {
 1462                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1463                 }
 1464         }
 1465         return (0);
 1466 }
 1467 
 1468 void
 1469 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1470     struct sctp_tcb *stcb,
 1471     struct sctp_nets *net)
 1472 {
 1473         uint32_t next_mtu, mtu;
 1474 
 1475         next_mtu = sctp_get_next_mtu(net->mtu);
 1476 
 1477         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1478                 if ((net->src_addr_selected == 0) ||
 1479                     (net->ro._s_addr == NULL) ||
 1480                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1481                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1482                                 sctp_free_ifa(net->ro._s_addr);
 1483                                 net->ro._s_addr = NULL;
 1484                                 net->src_addr_selected = 0;
 1485                         } else if (net->ro._s_addr == NULL) {
 1486 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1487                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1488                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1489 
 1490                                         /* KAME hack: embed scopeid */
 1491                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1492                                 }
 1493 #endif
 1494 
 1495                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1496                                     stcb,
 1497                                     (sctp_route_t *)&net->ro,
 1498                                     net, 0, stcb->asoc.vrf_id);
 1499 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1500                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1501                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1502 
 1503                                         (void)sa6_recoverscope(sin6);
 1504                                 }
 1505 #endif                          /* INET6 */
 1506                         }
 1507                         if (net->ro._s_addr)
 1508                                 net->src_addr_selected = 1;
 1509                 }
 1510                 if (net->ro._s_addr) {
 1511                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1512 #if defined(INET) || defined(INET6)
 1513                         if (net->port) {
 1514                                 mtu -= sizeof(struct udphdr);
 1515                         }
 1516 #endif
 1517                         if (mtu > next_mtu) {
 1518                                 net->mtu = next_mtu;
 1519                         } else {
 1520                                 net->mtu = mtu;
 1521                         }
 1522                 }
 1523         }
 1524         /* restart the timer */
 1525         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1526 }
 1527 
 1528 void
 1529 sctp_autoclose_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
 1530 {
 1531         struct timeval tn, *tim_touse;
 1532         struct sctp_association *asoc;
 1533         uint32_t ticks_gone_by;
 1534 
 1535         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1536         if (stcb->asoc.sctp_autoclose_ticks > 0 &&
 1537             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1538                 /* Auto close is on */
 1539                 asoc = &stcb->asoc;
 1540                 /* pick the time to use */
 1541                 if (asoc->time_last_rcvd.tv_sec >
 1542                     asoc->time_last_sent.tv_sec) {
 1543                         tim_touse = &asoc->time_last_rcvd;
 1544                 } else {
 1545                         tim_touse = &asoc->time_last_sent;
 1546                 }
 1547                 /* Now has long enough transpired to autoclose? */
 1548                 ticks_gone_by = sctp_secs_to_ticks((uint32_t)(tn.tv_sec - tim_touse->tv_sec));
 1549                 if (ticks_gone_by >= asoc->sctp_autoclose_ticks) {
 1550                         /*
 1551                          * autoclose time has hit, call the output routine,
 1552                          * which should do nothing just to be SURE we don't
 1553                          * have hanging data. We can then safely check the
 1554                          * queues and know that we are clear to send
 1555                          * shutdown
 1556                          */
 1557                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1558                         /* Are we clean? */
 1559                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1560                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1561                                 /*
 1562                                  * there is nothing queued to send, so I'm
 1563                                  * done...
 1564                                  */
 1565                                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
 1566                                         /* only send SHUTDOWN 1st time thru */
 1567                                         struct sctp_nets *net;
 1568 
 1569                                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 1570                                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1571                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1572                                         }
 1573                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
 1574                                         sctp_stop_timers_for_shutdown(stcb);
 1575                                         if (stcb->asoc.alternate) {
 1576                                                 net = stcb->asoc.alternate;
 1577                                         } else {
 1578                                                 net = stcb->asoc.primary_destination;
 1579                                         }
 1580                                         sctp_send_shutdown(stcb, net);
 1581                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1582                                             stcb->sctp_ep, stcb, net);
 1583                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1584                                             stcb->sctp_ep, stcb, NULL);
 1585                                 }
 1586                         }
 1587                 } else {
 1588                         /*
 1589                          * No auto close at this time, reset t-o to check
 1590                          * later
 1591                          */
 1592                         uint32_t tmp;
 1593 
 1594                         /* fool the timer startup to use the time left */
 1595                         tmp = asoc->sctp_autoclose_ticks;
 1596                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1597                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
 1598                         /* restore the real tick value */
 1599                         asoc->sctp_autoclose_ticks = tmp;
 1600                 }
 1601         }
 1602 }
Cache object: b97de984c381941b574ce76728f76557
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_timer.c

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