sctp_timer.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   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) == 0) {
  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, true, 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 as there
  168  * exists nets, which are not being deleted.
  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         bool looped;
  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 selection can be made. */
  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 destination
  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         /* Look for an alternate net, which is active. */
  332         if ((net != NULL) && ((net->dest_state & SCTP_ADDR_BEING_DELETED) == 0)) {
  333                 alt = TAILQ_NEXT(net, sctp_next);
  334         } else {
  335                 alt = TAILQ_FIRST(&stcb->asoc.nets);
  336         }
  337         looped = false;
  338         for (;;) {
  339                 if (alt == NULL) {
  340                         if (!looped) {
  341                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
  342                                 looped = true;
  343                         }
  344                         /* Definitely out of candidates. */
  345                         if (alt == NULL) {
  346                                 break;
  347                         }
  348                 }
  349                 if (alt->ro.ro_nh == NULL) {
  350                         if (alt->ro._s_addr) {
  351                                 sctp_free_ifa(alt->ro._s_addr);
  352                                 alt->ro._s_addr = NULL;
  353                         }
  354                         alt->src_addr_selected = 0;
  355                 }
  356                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
  357                     (alt->ro.ro_nh != NULL) &&
  358                     ((alt->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) &&
  359                     (alt != net)) {
  360                         /* Found an alternate net, which is reachable. */
  361                         break;
  362                 }
  363                 alt = TAILQ_NEXT(alt, sctp_next);
  364         }
  365 
  366         if (alt == NULL) {
  367                 /*
  368                  * In case no active alternate net has been found, look for
  369                  * an alternate net, which is confirmed.
  370                  */
  371                 if ((net != NULL) && ((net->dest_state & SCTP_ADDR_BEING_DELETED) == 0)) {
  372                         alt = TAILQ_NEXT(net, sctp_next);
  373                 } else {
  374                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  375                 }
  376                 looped = false;
  377                 for (;;) {
  378                         if (alt == NULL) {
  379                                 if (!looped) {
  380                                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  381                                         looped = true;
  382                                 }
  383                                 /* Definitely out of candidates. */
  384                                 if (alt == NULL) {
  385                                         break;
  386                                 }
  387                         }
  388                         if (((alt->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) &&
  389                             (alt != net)) {
  390                                 /*
  391                                  * Found an alternate net, which is
  392                                  * confirmed.
  393                                  */
  394                                 break;
  395                         }
  396                         alt = TAILQ_NEXT(alt, sctp_next);
  397                 }
  398         }
  399         if (alt == NULL) {
  400                 /*
  401                  * In case no confirmed alternate net has been found, just
  402                  * return net, if it is not being deleted. In the other case
  403                  * just return the first net.
  404                  */
  405                 if ((net != NULL) && ((net->dest_state & SCTP_ADDR_BEING_DELETED) == 0)) {
  406                         alt = net;
  407                 }
  408                 if (alt == NULL) {
  409                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  410                 }
  411         }
  412         return (alt);
  413 }
  414 
  415 static void
  416 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
  417     struct sctp_nets *net,
  418     int win_probe,
  419     int num_marked, int num_abandoned)
  420 {
  421         if (net->RTO == 0) {
  422                 if (net->RTO_measured) {
  423                         net->RTO = stcb->asoc.minrto;
  424                 } else {
  425                         net->RTO = stcb->asoc.initial_rto;
  426                 }
  427         }
  428         net->RTO <<= 1;
  429         if (net->RTO > stcb->asoc.maxrto) {
  430                 net->RTO = stcb->asoc.maxrto;
  431         }
  432         if ((win_probe == 0) && (num_marked || num_abandoned)) {
  433                 /* We don't apply penalty to window probe scenarios */
  434                 /* JRS - Use the congestion control given in the CC module */
  435                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
  436         }
  437 }
  438 
  439 #ifndef INVARIANTS
  440 static void
  441 sctp_recover_sent_list(struct sctp_tcb *stcb)
  442 {
  443         struct sctp_tmit_chunk *chk, *nchk;
  444         struct sctp_association *asoc;
  445 
  446         asoc = &stcb->asoc;
  447         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  448                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
  449                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
  450                             (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
  451                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
  452                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
  453                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
  454                                 }
  455                         }
  456                         if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
  457                             (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
  458                             TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
  459                                 asoc->trigger_reset = 1;
  460                         }
  461                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  462                         if (PR_SCTP_ENABLED(chk->flags)) {
  463                                 if (asoc->pr_sctp_cnt != 0)
  464                                         asoc->pr_sctp_cnt--;
  465                         }
  466                         if (chk->data) {
  467                                 /* sa_ignore NO_NULL_CHK */
  468                                 sctp_free_bufspace(stcb, asoc, chk, 1);
  469                                 sctp_m_freem(chk->data);
  470                                 chk->data = NULL;
  471                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
  472                                         asoc->sent_queue_cnt_removeable--;
  473                                 }
  474                         }
  475                         asoc->sent_queue_cnt--;
  476                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  477                 }
  478         }
  479         SCTP_PRINTF("after recover order is as follows\n");
  480         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  481                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.tsn);
  482         }
  483 }
  484 #endif
  485 
  486 static int
  487 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
  488     struct sctp_nets *net,
  489     struct sctp_nets *alt,
  490     int window_probe,
  491     int *num_marked,
  492     int *num_abandoned)
  493 {
  494 
  495         /*
  496          * Mark all chunks (well not all) that were sent to *net for
  497          * retransmission. Move them to alt for there destination as well...
  498          * We only mark chunks that have been outstanding long enough to
  499          * have received feed-back.
  500          */
  501         struct sctp_tmit_chunk *chk, *nchk;
  502         struct sctp_nets *lnets;
  503         struct timeval now, min_wait, tv;
  504         int cur_rto;
  505         int cnt_abandoned;
  506         int audit_tf, num_mk, fir;
  507         unsigned int cnt_mk;
  508         uint32_t orig_flight, orig_tf;
  509         uint32_t tsnlast, tsnfirst;
  510 #ifndef INVARIANTS
  511         int recovery_cnt = 0;
  512 #endif
  513 
  514         /* none in flight now */
  515         audit_tf = 0;
  516         fir = 0;
  517         /*
  518          * figure out how long a data chunk must be pending before we can
  519          * mark it ..
  520          */
  521         (void)SCTP_GETTIME_TIMEVAL(&now);
  522         /* get cur rto in micro-seconds */
  523         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
  524         cur_rto *= 1000;
  525         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  526                 sctp_log_fr(cur_rto,
  527                     stcb->asoc.peers_rwnd,
  528                     window_probe,
  529                     SCTP_FR_T3_MARK_TIME);
  530                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
  531                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
  532         }
  533         tv.tv_sec = cur_rto / 1000000;
  534         tv.tv_usec = cur_rto % 1000000;
  535         min_wait = now;
  536         timevalsub(&min_wait, &tv);
  537         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
  538                 /*
  539                  * if we hit here, we don't have enough seconds on the clock
  540                  * to account for the RTO. We just let the lower seconds be
  541                  * the bounds and don't worry about it. This may mean we
  542                  * will mark a lot more than we should.
  543                  */
  544                 min_wait.tv_sec = min_wait.tv_usec = 0;
  545         }
  546         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  547                 sctp_log_fr(cur_rto, (uint32_t)now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
  548                 sctp_log_fr(0, (uint32_t)min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
  549         }
  550         /*
  551          * Our rwnd will be incorrect here since we are not adding back the
  552          * cnt * mbuf but we will fix that down below.
  553          */
  554         orig_flight = net->flight_size;
  555         orig_tf = stcb->asoc.total_flight;
  556 
  557         net->fast_retran_ip = 0;
  558         /* Now on to each chunk */
  559         cnt_abandoned = 0;
  560         num_mk = cnt_mk = 0;
  561         tsnfirst = tsnlast = 0;
  562 #ifndef INVARIANTS
  563 start_again:
  564 #endif
  565         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
  566                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
  567                         /* Strange case our list got out of order? */
  568                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
  569                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
  570 #ifdef INVARIANTS
  571                         panic("last acked >= chk on sent-Q");
  572 #else
  573                         recovery_cnt++;
  574                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
  575                         sctp_recover_sent_list(stcb);
  576                         if (recovery_cnt < 10) {
  577                                 goto start_again;
  578                         } else {
  579                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
  580                         }
  581 #endif
  582                 }
  583                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
  584                         /*
  585                          * found one to mark: If it is less than
  586                          * DATAGRAM_ACKED it MUST not be a skipped or marked
  587                          * TSN but instead one that is either already set
  588                          * for retransmission OR one that needs
  589                          * retransmission.
  590                          */
  591 
  592                         /* validate its been outstanding long enough */
  593                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  594                                 sctp_log_fr(chk->rec.data.tsn,
  595                                     (uint32_t)chk->sent_rcv_time.tv_sec,
  596                                     chk->sent_rcv_time.tv_usec,
  597                                     SCTP_FR_T3_MARK_TIME);
  598                         }
  599                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
  600                                 /*
  601                                  * we have reached a chunk that was sent
  602                                  * some seconds past our min.. forget it we
  603                                  * will find no more to send.
  604                                  */
  605                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  606                                         sctp_log_fr(0,
  607                                             (uint32_t)chk->sent_rcv_time.tv_sec,
  608                                             chk->sent_rcv_time.tv_usec,
  609                                             SCTP_FR_T3_STOPPED);
  610                                 }
  611                                 continue;
  612                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
  613                             (window_probe == 0)) {
  614                                 /*
  615                                  * we must look at the micro seconds to
  616                                  * know.
  617                                  */
  618                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
  619                                         /*
  620                                          * ok it was sent after our boundary
  621                                          * time.
  622                                          */
  623                                         continue;
  624                                 }
  625                         }
  626                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
  627                                 /* Is it expired? */
  628                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
  629                                         /* Yes so drop it */
  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 (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
  641                                 /* Has it been retransmitted tv_sec times? */
  642                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
  643                                         if (chk->data) {
  644                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  645                                                     chk,
  646                                                     1,
  647                                                     SCTP_SO_NOT_LOCKED);
  648                                                 cnt_abandoned++;
  649                                         }
  650                                         continue;
  651                                 }
  652                         }
  653                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  654                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  655                                 num_mk++;
  656                                 if (fir == 0) {
  657                                         fir = 1;
  658                                         tsnfirst = chk->rec.data.tsn;
  659                                 }
  660                                 tsnlast = chk->rec.data.tsn;
  661                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  662                                         sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
  663                                             0, SCTP_FR_T3_MARKED);
  664                                 }
  665 
  666                                 if (chk->rec.data.chunk_was_revoked) {
  667                                         /* deflate the cwnd */
  668                                         chk->whoTo->cwnd -= chk->book_size;
  669                                         chk->rec.data.chunk_was_revoked = 0;
  670                                 }
  671                                 net->marked_retrans++;
  672                                 stcb->asoc.marked_retrans++;
  673                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  674                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  675                                             chk->whoTo->flight_size,
  676                                             chk->book_size,
  677                                             (uint32_t)(uintptr_t)chk->whoTo,
  678                                             chk->rec.data.tsn);
  679                                 }
  680                                 sctp_flight_size_decrease(chk);
  681                                 sctp_total_flight_decrease(stcb, chk);
  682                                 stcb->asoc.peers_rwnd += chk->send_size;
  683                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  684                         }
  685                         chk->sent = SCTP_DATAGRAM_RESEND;
  686                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  687                         SCTP_STAT_INCR(sctps_markedretrans);
  688 
  689                         /* reset the TSN for striking and other FR stuff */
  690                         chk->rec.data.doing_fast_retransmit = 0;
  691                         /* Clear any time so NO RTT is being done */
  692 
  693                         if (chk->do_rtt) {
  694                                 if (chk->whoTo->rto_needed == 0) {
  695                                         chk->whoTo->rto_needed = 1;
  696                                 }
  697                         }
  698                         chk->do_rtt = 0;
  699                         if (alt != net) {
  700                                 sctp_free_remote_addr(chk->whoTo);
  701                                 chk->no_fr_allowed = 1;
  702                                 chk->whoTo = alt;
  703                                 atomic_add_int(&alt->ref_count, 1);
  704                         } else {
  705                                 chk->no_fr_allowed = 0;
  706                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  707                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  708                                 } else {
  709                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
  710                                 }
  711                         }
  712                         /*
  713                          * CMT: Do not allow FRs on retransmitted TSNs.
  714                          */
  715                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  716                                 chk->no_fr_allowed = 1;
  717                         }
  718 #ifdef THIS_SHOULD_NOT_BE_DONE
  719                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  720                         /* remember highest acked one */
  721                         could_be_sent = chk;
  722 #endif
  723                 }
  724                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  725                         cnt_mk++;
  726                 }
  727         }
  728         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  729                 /* we did not subtract the same things? */
  730                 audit_tf = 1;
  731         }
  732 
  733         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  734                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  735         }
  736 #ifdef SCTP_DEBUG
  737         if (num_mk) {
  738                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  739                     tsnlast);
  740                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
  741                     num_mk,
  742                     stcb->asoc.peers_rwnd);
  743         }
  744 #endif
  745         *num_marked = num_mk;
  746         *num_abandoned = cnt_abandoned;
  747         /*
  748          * Now check for a ECN Echo that may be stranded And include the
  749          * cnt_mk'd to have all resends in the control queue.
  750          */
  751         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  752                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  753                         cnt_mk++;
  754                 }
  755                 if ((chk->whoTo == net) &&
  756                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  757                         sctp_free_remote_addr(chk->whoTo);
  758                         chk->whoTo = alt;
  759                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  760                                 chk->sent = SCTP_DATAGRAM_RESEND;
  761                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  762                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  763                                 cnt_mk++;
  764                         }
  765                         atomic_add_int(&alt->ref_count, 1);
  766                 }
  767         }
  768 #ifdef THIS_SHOULD_NOT_BE_DONE
  769         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  770                 /* fix it so we retransmit the highest acked anyway */
  771                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  772                 cnt_mk++;
  773                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  774         }
  775 #endif
  776         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  777 #ifdef INVARIANTS
  778                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  779                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  780 #endif
  781 #ifndef SCTP_AUDITING_ENABLED
  782                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  783 #endif
  784         }
  785         if (audit_tf) {
  786                 SCTPDBG(SCTP_DEBUG_TIMER4,
  787                     "Audit total flight due to negative value net:%p\n",
  788                     (void *)net);
  789                 stcb->asoc.total_flight = 0;
  790                 stcb->asoc.total_flight_count = 0;
  791                 /* Clear all networks flight size */
  792                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  793                         lnets->flight_size = 0;
  794                         SCTPDBG(SCTP_DEBUG_TIMER4,
  795                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  796                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
  797                 }
  798                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  799                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  800                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  801                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  802                                             chk->whoTo->flight_size,
  803                                             chk->book_size,
  804                                             (uint32_t)(uintptr_t)chk->whoTo,
  805                                             chk->rec.data.tsn);
  806                                 }
  807 
  808                                 sctp_flight_size_increase(chk);
  809                                 sctp_total_flight_increase(stcb, chk);
  810                         }
  811                 }
  812         }
  813         /* We return 1 if we only have a window probe outstanding */
  814         return (0);
  815 }
  816 
  817 int
  818 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  819     struct sctp_tcb *stcb,
  820     struct sctp_nets *net)
  821 {
  822         struct sctp_nets *alt;
  823         int win_probe, num_mk, num_abandoned;
  824 
  825         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  826                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  827         }
  828         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  829                 struct sctp_nets *lnet;
  830 
  831                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  832                         if (net == lnet) {
  833                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  834                         } else {
  835                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  836                         }
  837                 }
  838         }
  839         /* Find an alternate and mark those for retransmission */
  840         if ((stcb->asoc.peers_rwnd == 0) &&
  841             (stcb->asoc.total_flight < net->mtu)) {
  842                 SCTP_STAT_INCR(sctps_timowindowprobe);
  843                 win_probe = 1;
  844         } else {
  845                 win_probe = 0;
  846         }
  847 
  848         if (win_probe == 0) {
  849                 /* We don't do normal threshold management on window probes */
  850                 if (sctp_threshold_management(inp, stcb, net,
  851                     stcb->asoc.max_send_times)) {
  852                         /* Association was destroyed */
  853                         return (1);
  854                 } else {
  855                         if (net != stcb->asoc.primary_destination) {
  856                                 /* send a immediate HB if our RTO is stale */
  857                                 struct timeval now;
  858                                 uint32_t ms_goneby;
  859 
  860                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  861                                 if (net->last_sent_time.tv_sec) {
  862                                         ms_goneby = (uint32_t)(now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  863                                 } else {
  864                                         ms_goneby = 0;
  865                                 }
  866                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  867                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  868                                                 /*
  869                                                  * no recent feed back in an
  870                                                  * RTO or more, request a
  871                                                  * RTT update
  872                                                  */
  873                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  874                                         }
  875                                 }
  876                         }
  877                 }
  878         } else {
  879                 /*
  880                  * For a window probe we don't penalize the net's but only
  881                  * the association. This may fail it if SACKs are not coming
  882                  * back. If sack's are coming with rwnd locked at 0, we will
  883                  * continue to hold things waiting for rwnd to raise
  884                  */
  885                 if (sctp_threshold_management(inp, stcb, NULL,
  886                     stcb->asoc.max_send_times)) {
  887                         /* Association was destroyed */
  888                         return (1);
  889                 }
  890         }
  891         if (stcb->asoc.sctp_cmt_on_off > 0) {
  892                 if (net->pf_threshold < net->failure_threshold) {
  893                         alt = sctp_find_alternate_net(stcb, net, 2);
  894                 } else {
  895                         /*
  896                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  897                          * being used, then pick dest with largest ssthresh
  898                          * for any retransmission.
  899                          */
  900                         alt = sctp_find_alternate_net(stcb, net, 1);
  901                         /*
  902                          * CUCv2: If a different dest is picked for the
  903                          * retransmission, then new (rtx-)pseudo_cumack
  904                          * needs to be tracked for orig dest. Let CUCv2
  905                          * track new (rtx-) pseudo-cumack always.
  906                          */
  907                         net->find_pseudo_cumack = 1;
  908                         net->find_rtx_pseudo_cumack = 1;
  909                 }
  910         } else {
  911                 alt = sctp_find_alternate_net(stcb, net, 0);
  912         }
  913 
  914         num_mk = 0;
  915         num_abandoned = 0;
  916         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  917             &num_mk, &num_abandoned);
  918         /* FR Loss recovery just ended with the T3. */
  919         stcb->asoc.fast_retran_loss_recovery = 0;
  920 
  921         /* CMT FR loss recovery ended with the T3 */
  922         net->fast_retran_loss_recovery = 0;
  923         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  924             (net->flight_size == 0)) {
  925                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  926         }
  927 
  928         /*
  929          * setup the sat loss recovery that prevents satellite cwnd advance.
  930          */
  931         stcb->asoc.sat_t3_loss_recovery = 1;
  932         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  933 
  934         /* Backoff the timer and cwnd */
  935         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  936         if (((net->dest_state & SCTP_ADDR_REACHABLE) == 0) ||
  937             (net->dest_state & SCTP_ADDR_PF)) {
  938                 /* Move all pending over too */
  939                 sctp_move_chunks_from_net(stcb, net);
  940 
  941                 /*
  942                  * Get the address that failed, to force a new src address
  943                  * selection and a route allocation.
  944                  */
  945                 if (net->ro._s_addr != NULL) {
  946                         sctp_free_ifa(net->ro._s_addr);
  947                         net->ro._s_addr = NULL;
  948                 }
  949                 net->src_addr_selected = 0;
  950 
  951                 /* Force a route allocation too */
  952                 RO_NHFREE(&net->ro);
  953 
  954                 /* Was it our primary? */
  955                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  956                         /*
  957                          * Yes, note it as such and find an alternate note:
  958                          * this means HB code must use this to resent the
  959                          * primary if it goes active AND if someone does a
  960                          * change-primary then this flag must be cleared
  961                          * from any net structures.
  962                          */
  963                         if (stcb->asoc.alternate != NULL) {
  964                                 sctp_free_remote_addr(stcb->asoc.alternate);
  965                         }
  966                         stcb->asoc.alternate = alt;
  967                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  968                 }
  969         }
  970         /*
  971          * Special case for cookie-echo'ed case, we don't do output but must
  972          * await the COOKIE-ACK before retransmission
  973          */
  974         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
  975                 /*
  976                  * Here we just reset the timer and start again since we
  977                  * have not established the asoc
  978                  */
  979                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  980                 return (0);
  981         }
  982         if (stcb->asoc.prsctp_supported) {
  983                 struct sctp_tmit_chunk *lchk;
  984 
  985                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  986                 /* C3. See if we need to send a Fwd-TSN */
  987                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  988                         send_forward_tsn(stcb, &stcb->asoc);
  989                         for (; lchk != NULL; lchk = TAILQ_NEXT(lchk, sctp_next)) {
  990                                 if (lchk->whoTo != NULL) {
  991                                         break;
  992                                 }
  993                         }
  994                         if (lchk != NULL) {
  995                                 /* Assure a timer is up */
  996                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  997                         }
  998                 }
  999         }
 1000         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
 1001                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
 1002         }
 1003         return (0);
 1004 }
 1005 
 1006 int
 1007 sctp_t1init_timer(struct sctp_inpcb *inp,
 1008     struct sctp_tcb *stcb,
 1009     struct sctp_nets *net)
 1010 {
 1011         /* bump the thresholds */
 1012         if (stcb->asoc.delayed_connection) {
 1013                 /*
 1014                  * special hook for delayed connection. The library did NOT
 1015                  * complete the rest of its sends.
 1016                  */
 1017                 stcb->asoc.delayed_connection = 0;
 1018                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1019                 return (0);
 1020         }
 1021         if (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT) {
 1022                 return (0);
 1023         }
 1024         if (sctp_threshold_management(inp, stcb, net,
 1025             stcb->asoc.max_init_times)) {
 1026                 /* Association was destroyed */
 1027                 return (1);
 1028         }
 1029         stcb->asoc.dropped_special_cnt = 0;
 1030         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1031         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1032                 net->RTO = stcb->asoc.initial_init_rto_max;
 1033         }
 1034         if (stcb->asoc.numnets > 1) {
 1035                 /* If we have more than one addr use it */
 1036                 struct sctp_nets *alt;
 1037 
 1038                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1039                 if (alt != stcb->asoc.primary_destination) {
 1040                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1041                         stcb->asoc.primary_destination = alt;
 1042                 }
 1043         }
 1044         /* Send out a new init */
 1045         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1046         return (0);
 1047 }
 1048 
 1049 /*
 1050  * For cookie and asconf we actually need to find and mark for resend, then
 1051  * increment the resend counter (after all the threshold management stuff of
 1052  * course).
 1053  */
 1054 int
 1055 sctp_cookie_timer(struct sctp_inpcb *inp,
 1056     struct sctp_tcb *stcb,
 1057     struct sctp_nets *net SCTP_UNUSED)
 1058 {
 1059         struct sctp_nets *alt;
 1060         struct sctp_tmit_chunk *cookie;
 1061 
 1062         /* first before all else we must find the cookie */
 1063         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1064                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1065                         break;
 1066                 }
 1067         }
 1068         if (cookie == NULL) {
 1069                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 1070                         /* FOOBAR! */
 1071                         struct mbuf *op_err;
 1072 
 1073                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 1074                             "Cookie timer expired, but no cookie");
 1075                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
 1076                         sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
 1077                 } else {
 1078 #ifdef INVARIANTS
 1079                         panic("Cookie timer expires in wrong state?");
 1080 #else
 1081                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(stcb));
 1082                         return (0);
 1083 #endif
 1084                 }
 1085                 return (0);
 1086         }
 1087         /* Ok we found the cookie, threshold management next */
 1088         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1089             stcb->asoc.max_init_times)) {
 1090                 /* Assoc is over */
 1091                 return (1);
 1092         }
 1093         /*
 1094          * Cleared threshold management, now lets backoff the address and
 1095          * select an alternate
 1096          */
 1097         stcb->asoc.dropped_special_cnt = 0;
 1098         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1099         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1100         if (alt != cookie->whoTo) {
 1101                 sctp_free_remote_addr(cookie->whoTo);
 1102                 cookie->whoTo = alt;
 1103                 atomic_add_int(&alt->ref_count, 1);
 1104         }
 1105         /* Now mark the retran info */
 1106         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1107                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1108         }
 1109         cookie->sent = SCTP_DATAGRAM_RESEND;
 1110         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1111         /*
 1112          * Now call the output routine to kick out the cookie again, Note we
 1113          * don't mark any chunks for retran so that FR will need to kick in
 1114          * to move these (or a send timer).
 1115          */
 1116         return (0);
 1117 }
 1118 
 1119 int
 1120 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
 1121 {
 1122         struct sctp_nets *alt, *net;
 1123         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1124 
 1125         if (stcb->asoc.stream_reset_outstanding == 0) {
 1126                 return (0);
 1127         }
 1128         /* find the existing STRRESET, we use the seq number we sent out on */
 1129         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1130         if (strrst == NULL) {
 1131                 return (0);
 1132         }
 1133         net = strrst->whoTo;
 1134         /* do threshold management */
 1135         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1136                 /* Assoc is over */
 1137                 return (1);
 1138         }
 1139         /*
 1140          * Cleared threshold management, now lets backoff the address and
 1141          * select an alternate
 1142          */
 1143         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1144         alt = sctp_find_alternate_net(stcb, net, 0);
 1145         strrst->whoTo = alt;
 1146         atomic_add_int(&alt->ref_count, 1);
 1147 
 1148         /* See if a ECN Echo is also stranded */
 1149         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1150                 if ((chk->whoTo == net) &&
 1151                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1152                         sctp_free_remote_addr(chk->whoTo);
 1153                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1154                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1155                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1156                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1157                         }
 1158                         chk->whoTo = alt;
 1159                         atomic_add_int(&alt->ref_count, 1);
 1160                 }
 1161         }
 1162         if ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
 1163                 /*
 1164                  * If the address went un-reachable, we need to move to
 1165                  * alternates for ALL chk's in queue
 1166                  */
 1167                 sctp_move_chunks_from_net(stcb, net);
 1168         }
 1169         sctp_free_remote_addr(net);
 1170 
 1171         /* mark the retran info */
 1172         if (strrst->sent != SCTP_DATAGRAM_RESEND)
 1173                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1174         strrst->sent = SCTP_DATAGRAM_RESEND;
 1175         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1176 
 1177         /* restart the timer */
 1178         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, alt);
 1179         return (0);
 1180 }
 1181 
 1182 int
 1183 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1184     struct sctp_nets *net)
 1185 {
 1186         struct sctp_nets *alt;
 1187         struct sctp_tmit_chunk *asconf, *chk;
 1188 
 1189         /* is this a first send, or a retransmission? */
 1190         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1191                 /* compose a new ASCONF chunk and send it */
 1192                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1193         } else {
 1194                 /*
 1195                  * Retransmission of the existing ASCONF is needed
 1196                  */
 1197 
 1198                 /* find the existing ASCONF */
 1199                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1200                 if (asconf == NULL) {
 1201                         return (0);
 1202                 }
 1203                 net = asconf->whoTo;
 1204                 /* do threshold management */
 1205                 if (sctp_threshold_management(inp, stcb, net,
 1206                     stcb->asoc.max_send_times)) {
 1207                         /* Assoc is over */
 1208                         return (1);
 1209                 }
 1210                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1211                         /*
 1212                          * Something is rotten: our peer is not responding
 1213                          * to ASCONFs but apparently is to other chunks.
 1214                          * i.e. it is not properly handling the chunk type
 1215                          * upper bits. Mark this peer as ASCONF incapable
 1216                          * and cleanup.
 1217                          */
 1218                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1219                         sctp_asconf_cleanup(stcb);
 1220                         return (0);
 1221                 }
 1222                 /*
 1223                  * cleared threshold management, so now backoff the net and
 1224                  * select an alternate
 1225                  */
 1226                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1227                 alt = sctp_find_alternate_net(stcb, net, 0);
 1228                 if (asconf->whoTo != alt) {
 1229                         asconf->whoTo = alt;
 1230                         atomic_add_int(&alt->ref_count, 1);
 1231                 }
 1232 
 1233                 /* See if an ECN Echo is also stranded */
 1234                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1235                         if ((chk->whoTo == net) &&
 1236                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1237                                 sctp_free_remote_addr(chk->whoTo);
 1238                                 chk->whoTo = alt;
 1239                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1240                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1241                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1242                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1243                                 }
 1244                                 atomic_add_int(&alt->ref_count, 1);
 1245                         }
 1246                 }
 1247                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1248                         if (chk->whoTo != alt) {
 1249                                 sctp_free_remote_addr(chk->whoTo);
 1250                                 chk->whoTo = alt;
 1251                                 atomic_add_int(&alt->ref_count, 1);
 1252                         }
 1253                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1254                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1255                         chk->sent = SCTP_DATAGRAM_RESEND;
 1256                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1257                 }
 1258                 if ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
 1259                         /*
 1260                          * If the address went un-reachable, we need to move
 1261                          * to the alternate for ALL chunks in queue
 1262                          */
 1263                         sctp_move_chunks_from_net(stcb, net);
 1264                 }
 1265                 sctp_free_remote_addr(net);
 1266 
 1267                 /* mark the retran info */
 1268                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1269                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1270                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1271                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 1272 
 1273                 /* send another ASCONF if any and we can do */
 1274                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1275         }
 1276         return (0);
 1277 }
 1278 
 1279 /* Mobility adaptation */
 1280 void
 1281 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
 1282 {
 1283         if (stcb->asoc.deleted_primary == NULL) {
 1284                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1285                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1286                 return;
 1287         }
 1288         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1289         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1290         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1291         stcb->asoc.deleted_primary = NULL;
 1292         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1293         return;
 1294 }
 1295 
 1296 /*
 1297  * For the shutdown and shutdown-ack, we do not keep one around on the
 1298  * control queue. This means we must generate a new one and call the general
 1299  * chunk output routine, AFTER having done threshold management.
 1300  * It is assumed that net is non-NULL.
 1301  */
 1302 int
 1303 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1304     struct sctp_nets *net)
 1305 {
 1306         struct sctp_nets *alt;
 1307 
 1308         /* first threshold management */
 1309         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1310                 /* Assoc is over */
 1311                 return (1);
 1312         }
 1313         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1314         /* second select an alternative */
 1315         alt = sctp_find_alternate_net(stcb, net, 0);
 1316 
 1317         /* third generate a shutdown into the queue for out net */
 1318         sctp_send_shutdown(stcb, alt);
 1319 
 1320         /* fourth restart timer */
 1321         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1322         return (0);
 1323 }
 1324 
 1325 int
 1326 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1327     struct sctp_nets *net)
 1328 {
 1329         struct sctp_nets *alt;
 1330 
 1331         /* first threshold management */
 1332         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1333                 /* Assoc is over */
 1334                 return (1);
 1335         }
 1336         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1337         /* second select an alternative */
 1338         alt = sctp_find_alternate_net(stcb, net, 0);
 1339 
 1340         /* third generate a shutdown into the queue for out net */
 1341         sctp_send_shutdown_ack(stcb, alt);
 1342 
 1343         /* fourth restart timer */
 1344         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1345         return (0);
 1346 }
 1347 
 1348 static void
 1349 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
 1350 {
 1351         struct sctp_stream_queue_pending *sp;
 1352         unsigned int i, chks_in_queue = 0;
 1353         int being_filled = 0;
 1354 
 1355         KASSERT(inp != NULL, ("inp is NULL"));
 1356         KASSERT(stcb != NULL, ("stcb is NULL"));
 1357         SCTP_TCB_LOCK_ASSERT(stcb);
 1358         KASSERT(TAILQ_EMPTY(&stcb->asoc.send_queue), ("send_queue not empty"));
 1359         KASSERT(TAILQ_EMPTY(&stcb->asoc.sent_queue), ("sent_queue not empty"));
 1360 
 1361         if (stcb->asoc.sent_queue_retran_cnt) {
 1362                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1363                     stcb->asoc.sent_queue_retran_cnt);
 1364                 stcb->asoc.sent_queue_retran_cnt = 0;
 1365         }
 1366         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1367                 /* No stream scheduler information, initialize scheduler */
 1368                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc);
 1369                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1370                         /* yep, we lost a stream or two */
 1371                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1372                 } else {
 1373                         /* no streams lost */
 1374                         stcb->asoc.total_output_queue_size = 0;
 1375                 }
 1376         }
 1377         /* Check to see if some data queued, if so report it */
 1378         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1379                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1380                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1381                                 if (sp->msg_is_complete)
 1382                                         being_filled++;
 1383                                 chks_in_queue++;
 1384                         }
 1385                 }
 1386         }
 1387         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1388                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1389                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1390         }
 1391         if (chks_in_queue) {
 1392                 /* call the output queue function */
 1393                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1394                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1395                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1396                         /*
 1397                          * Probably should go in and make it go back through
 1398                          * and add fragments allowed
 1399                          */
 1400                         if (being_filled == 0) {
 1401                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1402                                     chks_in_queue);
 1403                         }
 1404                 }
 1405         } else {
 1406                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1407                     (u_long)stcb->asoc.total_output_queue_size);
 1408                 stcb->asoc.total_output_queue_size = 0;
 1409         }
 1410 }
 1411 
 1412 int
 1413 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1414     struct sctp_nets *net)
 1415 {
 1416         bool net_was_pf;
 1417 
 1418         net_was_pf = (net->dest_state & SCTP_ADDR_PF) != 0;
 1419         if (net->hb_responded == 0) {
 1420                 if (net->ro._s_addr != NULL) {
 1421                         /*
 1422                          * Invalidate the src address if we did not get a
 1423                          * response last time.
 1424                          */
 1425                         sctp_free_ifa(net->ro._s_addr);
 1426                         net->ro._s_addr = NULL;
 1427                         net->src_addr_selected = 0;
 1428                 }
 1429                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1430                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1431                         /* Assoc is over */
 1432                         return (1);
 1433                 }
 1434         }
 1435         /* Zero PBA, if it needs it */
 1436         if (net->partial_bytes_acked > 0) {
 1437                 net->partial_bytes_acked = 0;
 1438         }
 1439         if ((stcb->asoc.total_output_queue_size > 0) &&
 1440             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1441             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1442                 sctp_audit_stream_queues_for_size(inp, stcb);
 1443         }
 1444         if ((((net->dest_state & SCTP_ADDR_NOHB) == 0) ||
 1445             (net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 1446             (net_was_pf || ((net->dest_state & SCTP_ADDR_PF) == 0))) {
 1447                 /*
 1448                  * When moving to PF during threshold management, a HB has
 1449                  * been queued in that routine.
 1450                  */
 1451                 uint32_t ms_gone_by;
 1452 
 1453                 if ((net->last_sent_time.tv_sec > 0) ||
 1454                     (net->last_sent_time.tv_usec > 0)) {
 1455                         struct timeval diff;
 1456 
 1457                         SCTP_GETTIME_TIMEVAL(&diff);
 1458                         timevalsub(&diff, &net->last_sent_time);
 1459                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
 1460                             (uint32_t)(diff.tv_usec / 1000);
 1461                 } else {
 1462                         ms_gone_by = 0xffffffff;
 1463                 }
 1464                 if ((ms_gone_by >= net->heart_beat_delay) ||
 1465                     (net->dest_state & SCTP_ADDR_UNCONFIRMED) ||
 1466                     (net->dest_state & SCTP_ADDR_PF)) {
 1467                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1468                 }
 1469         }
 1470         return (0);
 1471 }
 1472 
 1473 void
 1474 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1475     struct sctp_tcb *stcb,
 1476     struct sctp_nets *net)
 1477 {
 1478         uint32_t next_mtu, mtu;
 1479 
 1480         next_mtu = sctp_get_next_mtu(net->mtu);
 1481 
 1482         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1483                 if ((net->src_addr_selected == 0) ||
 1484                     (net->ro._s_addr == NULL) ||
 1485                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1486                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1487                                 sctp_free_ifa(net->ro._s_addr);
 1488                                 net->ro._s_addr = NULL;
 1489                                 net->src_addr_selected = 0;
 1490                         } else if (net->ro._s_addr == NULL) {
 1491 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1492                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1493                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1494 
 1495                                         /* KAME hack: embed scopeid */
 1496                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1497                                 }
 1498 #endif
 1499 
 1500                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1501                                     stcb,
 1502                                     (sctp_route_t *)&net->ro,
 1503                                     net, 0, stcb->asoc.vrf_id);
 1504 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1505                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1506                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1507 
 1508                                         (void)sa6_recoverscope(sin6);
 1509                                 }
 1510 #endif                          /* INET6 */
 1511                         }
 1512                         if (net->ro._s_addr)
 1513                                 net->src_addr_selected = 1;
 1514                 }
 1515                 if (net->ro._s_addr) {
 1516                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_nh);
 1517 #if defined(INET) || defined(INET6)
 1518                         if (net->port) {
 1519                                 mtu -= sizeof(struct udphdr);
 1520                         }
 1521 #endif
 1522                         if (mtu > next_mtu) {
 1523                                 net->mtu = next_mtu;
 1524                         } else {
 1525                                 net->mtu = mtu;
 1526                         }
 1527                 }
 1528         }
 1529         /* restart the timer */
 1530         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1531 }
 1532 
 1533 void
 1534 sctp_autoclose_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
 1535 {
 1536         struct timeval tn, *tim_touse;
 1537         struct sctp_association *asoc;
 1538         uint32_t ticks_gone_by;
 1539 
 1540         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1541         if (stcb->asoc.sctp_autoclose_ticks > 0 &&
 1542             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1543                 /* Auto close is on */
 1544                 asoc = &stcb->asoc;
 1545                 /* pick the time to use */
 1546                 if (asoc->time_last_rcvd.tv_sec >
 1547                     asoc->time_last_sent.tv_sec) {
 1548                         tim_touse = &asoc->time_last_rcvd;
 1549                 } else {
 1550                         tim_touse = &asoc->time_last_sent;
 1551                 }
 1552                 /* Now has long enough transpired to autoclose? */
 1553                 ticks_gone_by = sctp_secs_to_ticks((uint32_t)(tn.tv_sec - tim_touse->tv_sec));
 1554                 if (ticks_gone_by >= asoc->sctp_autoclose_ticks) {
 1555                         /*
 1556                          * autoclose time has hit, call the output routine,
 1557                          * which should do nothing just to be SURE we don't
 1558                          * have hanging data. We can then safely check the
 1559                          * queues and know that we are clear to send
 1560                          * shutdown
 1561                          */
 1562                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1563                         /* Are we clean? */
 1564                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1565                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1566                                 /*
 1567                                  * there is nothing queued to send, so I'm
 1568                                  * done...
 1569                                  */
 1570                                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
 1571                                         /* only send SHUTDOWN 1st time thru */
 1572                                         struct sctp_nets *net;
 1573 
 1574                                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 1575                                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1576                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1577                                         }
 1578                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
 1579                                         sctp_stop_timers_for_shutdown(stcb);
 1580                                         if (stcb->asoc.alternate) {
 1581                                                 net = stcb->asoc.alternate;
 1582                                         } else {
 1583                                                 net = stcb->asoc.primary_destination;
 1584                                         }
 1585                                         sctp_send_shutdown(stcb, net);
 1586                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1587                                             stcb->sctp_ep, stcb, net);
 1588                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1589                                             stcb->sctp_ep, stcb, NULL);
 1590                                 }
 1591                         }
 1592                 } else {
 1593                         /*
 1594                          * No auto close at this time, reset t-o to check
 1595                          * later
 1596                          */
 1597                         uint32_t tmp;
 1598 
 1599                         /* fool the timer startup to use the time left */
 1600                         tmp = asoc->sctp_autoclose_ticks;
 1601                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1602                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
 1603                         /* restore the real tick value */
 1604                         asoc->sctp_autoclose_ticks = tmp;
 1605                 }
 1606         }
 1607 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_timer.c

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