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

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 /* $KAME: sctp_timer.c,v 1.29 2005/03/06 16:04:18 itojun Exp $   */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/8.3/sys/netinet/sctp_timer.c 231492 2012-02-11 00:57:08Z tuexen $");
   37 
   38 #define _IP_VHL
   39 #include <netinet/sctp_os.h>
   40 #include <netinet/sctp_pcb.h>
   41 #ifdef INET6
   42 #endif
   43 #include <netinet/sctp_var.h>
   44 #include <netinet/sctp_sysctl.h>
   45 #include <netinet/sctp_timer.h>
   46 #include <netinet/sctputil.h>
   47 #include <netinet/sctp_output.h>
   48 #include <netinet/sctp_header.h>
   49 #include <netinet/sctp_indata.h>
   50 #include <netinet/sctp_asconf.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/sctp.h>
   53 #include <netinet/sctp_uio.h>
   54 #include <netinet/udp.h>
   55 
   56 
   57 void
   58 sctp_audit_retranmission_queue(struct sctp_association *asoc)
   59 {
   60         struct sctp_tmit_chunk *chk;
   61 
   62         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
   63             asoc->sent_queue_retran_cnt,
   64             asoc->sent_queue_cnt);
   65         asoc->sent_queue_retran_cnt = 0;
   66         asoc->sent_queue_cnt = 0;
   67         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
   68                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   69                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   70                 }
   71                 asoc->sent_queue_cnt++;
   72         }
   73         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
   74                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   75                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   76                 }
   77         }
   78         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
   79                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
   80                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
   81                 }
   82         }
   83         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
   84             asoc->sent_queue_retran_cnt,
   85             asoc->sent_queue_cnt);
   86 }
   87 
   88 int
   89 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
   90     struct sctp_nets *net, uint16_t threshold)
   91 {
   92         if (net) {
   93                 net->error_count++;
   94                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
   95                     net, net->error_count,
   96                     net->failure_threshold);
   97                 if (net->error_count > net->failure_threshold) {
   98                         /* We had a threshold failure */
   99                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
  100                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
  101                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
  102                                 net->dest_state &= ~SCTP_ADDR_PF;
  103                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  104                                     stcb,
  105                                     SCTP_FAILED_THRESHOLD,
  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, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
  115                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
  116                         }
  117                 }
  118         }
  119         if (stcb == NULL)
  120                 return (0);
  121 
  122         if (net) {
  123                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
  124                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  125                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
  126                                     stcb->asoc.overall_error_count,
  127                                     (stcb->asoc.overall_error_count + 1),
  128                                     SCTP_FROM_SCTP_TIMER,
  129                                     __LINE__);
  130                         }
  131                         stcb->asoc.overall_error_count++;
  132                 }
  133         } else {
  134                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
  135                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
  136                             stcb->asoc.overall_error_count,
  137                             (stcb->asoc.overall_error_count + 1),
  138                             SCTP_FROM_SCTP_TIMER,
  139                             __LINE__);
  140                 }
  141                 stcb->asoc.overall_error_count++;
  142         }
  143         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
  144             &stcb->asoc, stcb->asoc.overall_error_count,
  145             (uint32_t) threshold,
  146             ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
  147         /*
  148          * We specifically do not do >= to give the assoc one more change
  149          * before we fail it.
  150          */
  151         if (stcb->asoc.overall_error_count > threshold) {
  152                 /* Abort notification sends a ULP notify */
  153                 struct mbuf *oper;
  154 
  155                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
  156                     0, M_DONTWAIT, 1, MT_DATA);
  157                 if (oper) {
  158                         struct sctp_paramhdr *ph;
  159                         uint32_t *ippp;
  160 
  161                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
  162                             sizeof(uint32_t);
  163                         ph = mtod(oper, struct sctp_paramhdr *);
  164                         ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
  165                         ph->param_length = htons(SCTP_BUF_LEN(oper));
  166                         ippp = (uint32_t *) (ph + 1);
  167                         *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
  168                 }
  169                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_1;
  170                 sctp_abort_an_association(inp, stcb, SCTP_FAILED_THRESHOLD, oper, SCTP_SO_NOT_LOCKED);
  171                 return (1);
  172         }
  173         return (0);
  174 }
  175 
  176 /*
  177  * sctp_find_alternate_net() returns a non-NULL pointer as long
  178  * the argument net is non-NULL.
  179  */
  180 struct sctp_nets *
  181 sctp_find_alternate_net(struct sctp_tcb *stcb,
  182     struct sctp_nets *net,
  183     int mode)
  184 {
  185         /* Find and return an alternate network if possible */
  186         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
  187         int once;
  188 
  189         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
  190         int min_errors = -1;
  191         uint32_t max_cwnd = 0;
  192 
  193         if (stcb->asoc.numnets == 1) {
  194                 /* No others but net */
  195                 return (TAILQ_FIRST(&stcb->asoc.nets));
  196         }
  197         /*
  198          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
  199          * net algorithm. This algorithm chooses the active destination (not
  200          * in PF state) with the largest cwnd value. If all destinations are
  201          * in PF state, unreachable, or unconfirmed, choose the desination
  202          * that is in PF state with the lowest error count. In case of a
  203          * tie, choose the destination that was most recently active.
  204          */
  205         if (mode == 2) {
  206                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  207                         /*
  208                          * JRS 5/14/07 - If the destination is unreachable
  209                          * or unconfirmed, skip it.
  210                          */
  211                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  212                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  213                                 continue;
  214                         }
  215                         /*
  216                          * JRS 5/14/07 -  If the destination is reachable
  217                          * but in PF state, compare the error count of the
  218                          * destination to the minimum error count seen thus
  219                          * far. Store the destination with the lower error
  220                          * count.  If the error counts are equal, store the
  221                          * destination that was most recently active.
  222                          */
  223                         if (mnet->dest_state & SCTP_ADDR_PF) {
  224                                 /*
  225                                  * JRS 5/14/07 - If the destination under
  226                                  * consideration is the current destination,
  227                                  * work as if the error count is one higher.
  228                                  * The actual error count will not be
  229                                  * incremented until later in the t3
  230                                  * handler.
  231                                  */
  232                                 if (mnet == net) {
  233                                         if (min_errors == -1) {
  234                                                 min_errors = mnet->error_count + 1;
  235                                                 min_errors_net = mnet;
  236                                         } else if (mnet->error_count + 1 < min_errors) {
  237                                                 min_errors = mnet->error_count + 1;
  238                                                 min_errors_net = mnet;
  239                                         } else if (mnet->error_count + 1 == min_errors
  240                                             && mnet->last_active > min_errors_net->last_active) {
  241                                                 min_errors_net = mnet;
  242                                                 min_errors = mnet->error_count + 1;
  243                                         }
  244                                         continue;
  245                                 } else {
  246                                         if (min_errors == -1) {
  247                                                 min_errors = mnet->error_count;
  248                                                 min_errors_net = mnet;
  249                                         } else if (mnet->error_count < min_errors) {
  250                                                 min_errors = mnet->error_count;
  251                                                 min_errors_net = mnet;
  252                                         } else if (mnet->error_count == min_errors
  253                                             && mnet->last_active > min_errors_net->last_active) {
  254                                                 min_errors_net = mnet;
  255                                                 min_errors = mnet->error_count;
  256                                         }
  257                                         continue;
  258                                 }
  259                         }
  260                         /*
  261                          * JRS 5/14/07 - If the destination is reachable and
  262                          * not in PF state, compare the cwnd of the
  263                          * destination to the highest cwnd seen thus far.
  264                          * Store the destination with the higher cwnd value.
  265                          * If the cwnd values are equal, randomly choose one
  266                          * of the two destinations.
  267                          */
  268                         if (max_cwnd < mnet->cwnd) {
  269                                 max_cwnd_net = mnet;
  270                                 max_cwnd = mnet->cwnd;
  271                         } else if (max_cwnd == mnet->cwnd) {
  272                                 uint32_t rndval;
  273                                 uint8_t this_random;
  274 
  275                                 if (stcb->asoc.hb_random_idx > 3) {
  276                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  277                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
  278                                         this_random = stcb->asoc.hb_random_values[0];
  279                                         stcb->asoc.hb_random_idx++;
  280                                         stcb->asoc.hb_ect_randombit = 0;
  281                                 } else {
  282                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  283                                         stcb->asoc.hb_random_idx++;
  284                                         stcb->asoc.hb_ect_randombit = 0;
  285                                 }
  286                                 if (this_random % 2 == 1) {
  287                                         max_cwnd_net = mnet;
  288                                         max_cwnd = mnet->cwnd;  /* Useless? */
  289                                 }
  290                         }
  291                 }
  292                 if (max_cwnd_net == NULL) {
  293                         if (min_errors_net == NULL) {
  294                                 return (net);
  295                         }
  296                         return (min_errors_net);
  297                 } else {
  298                         return (max_cwnd_net);
  299                 }
  300         }
  301         /*
  302          * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
  303          * choosing an alternate net.
  304          */ 
  305         else if (mode == 1) {
  306                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
  307                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
  308                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
  309                                 /*
  310                                  * will skip ones that are not-reachable or
  311                                  * unconfirmed
  312                                  */
  313                                 continue;
  314                         }
  315                         if (max_cwnd < mnet->cwnd) {
  316                                 max_cwnd_net = mnet;
  317                                 max_cwnd = mnet->cwnd;
  318                         } else if (max_cwnd == mnet->cwnd) {
  319                                 uint32_t rndval;
  320                                 uint8_t this_random;
  321 
  322                                 if (stcb->asoc.hb_random_idx > 3) {
  323                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
  324                                         memcpy(stcb->asoc.hb_random_values, &rndval,
  325                                             sizeof(stcb->asoc.hb_random_values));
  326                                         this_random = stcb->asoc.hb_random_values[0];
  327                                         stcb->asoc.hb_random_idx = 0;
  328                                         stcb->asoc.hb_ect_randombit = 0;
  329                                 } else {
  330                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
  331                                         stcb->asoc.hb_random_idx++;
  332                                         stcb->asoc.hb_ect_randombit = 0;
  333                                 }
  334                                 if (this_random % 2) {
  335                                         max_cwnd_net = mnet;
  336                                         max_cwnd = mnet->cwnd;
  337                                 }
  338                         }
  339                 }
  340                 if (max_cwnd_net) {
  341                         return (max_cwnd_net);
  342                 }
  343         }
  344         mnet = net;
  345         once = 0;
  346 
  347         if (mnet == NULL) {
  348                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
  349                 if (mnet == NULL) {
  350                         return (NULL);
  351                 }
  352         }
  353         do {
  354                 alt = TAILQ_NEXT(mnet, sctp_next);
  355                 if (alt == NULL) {
  356                         once++;
  357                         if (once > 1) {
  358                                 break;
  359                         }
  360                         alt = TAILQ_FIRST(&stcb->asoc.nets);
  361                         if (alt == NULL) {
  362                                 return (NULL);
  363                         }
  364                 }
  365                 if (alt->ro.ro_rt == NULL) {
  366                         if (alt->ro._s_addr) {
  367                                 sctp_free_ifa(alt->ro._s_addr);
  368                                 alt->ro._s_addr = NULL;
  369                         }
  370                         alt->src_addr_selected = 0;
  371                 }
  372                 /* sa_ignore NO_NULL_CHK */
  373                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
  374                     (alt->ro.ro_rt != NULL) &&
  375                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
  376                         /* Found a reachable address */
  377                         break;
  378                 }
  379                 mnet = alt;
  380         } while (alt != NULL);
  381 
  382         if (alt == NULL) {
  383                 /* Case where NO insv network exists (dormant state) */
  384                 /* we rotate destinations */
  385                 once = 0;
  386                 mnet = net;
  387                 do {
  388                         if (mnet == NULL) {
  389                                 return (TAILQ_FIRST(&stcb->asoc.nets));
  390                         }
  391                         alt = TAILQ_NEXT(mnet, sctp_next);
  392                         if (alt == NULL) {
  393                                 once++;
  394                                 if (once > 1) {
  395                                         break;
  396                                 }
  397                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
  398                         }
  399                         /* sa_ignore NO_NULL_CHK */
  400                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
  401                             (alt != net)) {
  402                                 /* Found an alternate address */
  403                                 break;
  404                         }
  405                         mnet = alt;
  406                 } while (alt != NULL);
  407         }
  408         if (alt == NULL) {
  409                 return (net);
  410         }
  411         return (alt);
  412 }
  413 
  414 static void
  415 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
  416     struct sctp_nets *net,
  417     int win_probe,
  418     int num_marked, int num_abandoned)
  419 {
  420         if (net->RTO == 0) {
  421                 net->RTO = stcb->asoc.minrto;
  422         }
  423         net->RTO <<= 1;
  424         if (net->RTO > stcb->asoc.maxrto) {
  425                 net->RTO = stcb->asoc.maxrto;
  426         }
  427         if ((win_probe == 0) && (num_marked || num_abandoned)) {
  428                 /* We don't apply penalty to window probe scenarios */
  429                 /* JRS - Use the congestion control given in the CC module */
  430                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
  431         }
  432 }
  433 
  434 #ifndef INVARIANTS
  435 static void
  436 sctp_recover_sent_list(struct sctp_tcb *stcb)
  437 {
  438         struct sctp_tmit_chunk *chk, *nchk;
  439         struct sctp_association *asoc;
  440 
  441         asoc = &stcb->asoc;
  442         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
  443                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
  444                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
  445                             chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
  446                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
  447                         if (chk->pr_sctp_on) {
  448                                 if (asoc->pr_sctp_cnt != 0)
  449                                         asoc->pr_sctp_cnt--;
  450                         }
  451                         if (chk->data) {
  452                                 /* sa_ignore NO_NULL_CHK */
  453                                 sctp_free_bufspace(stcb, asoc, chk, 1);
  454                                 sctp_m_freem(chk->data);
  455                                 chk->data = NULL;
  456                                 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(chk->flags)) {
  457                                         asoc->sent_queue_cnt_removeable--;
  458                                 }
  459                         }
  460                         asoc->sent_queue_cnt--;
  461                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
  462                 }
  463         }
  464         SCTP_PRINTF("after recover order is as follows\n");
  465         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  466                 SCTP_PRINTF("chk:%p TSN:%x\n", chk, chk->rec.data.TSN_seq);
  467         }
  468 }
  469 
  470 #endif
  471 
  472 static int
  473 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
  474     struct sctp_nets *net,
  475     struct sctp_nets *alt,
  476     int window_probe,
  477     int *num_marked,
  478     int *num_abandoned)
  479 {
  480 
  481         /*
  482          * Mark all chunks (well not all) that were sent to *net for
  483          * retransmission. Move them to alt for there destination as well...
  484          * We only mark chunks that have been outstanding long enough to
  485          * have received feed-back.
  486          */
  487         struct sctp_tmit_chunk *chk, *nchk;
  488         struct sctp_nets *lnets;
  489         struct timeval now, min_wait, tv;
  490         int cur_rto;
  491         int cnt_abandoned;
  492         int audit_tf, num_mk, fir;
  493         unsigned int cnt_mk;
  494         uint32_t orig_flight, orig_tf;
  495         uint32_t tsnlast, tsnfirst;
  496         int recovery_cnt = 0;
  497 
  498 
  499         /* none in flight now */
  500         audit_tf = 0;
  501         fir = 0;
  502         /*
  503          * figure out how long a data chunk must be pending before we can
  504          * mark it ..
  505          */
  506         (void)SCTP_GETTIME_TIMEVAL(&now);
  507         /* get cur rto in micro-seconds */
  508         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
  509         cur_rto *= 1000;
  510         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  511                 sctp_log_fr(cur_rto,
  512                     stcb->asoc.peers_rwnd,
  513                     window_probe,
  514                     SCTP_FR_T3_MARK_TIME);
  515                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
  516                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
  517         }
  518         tv.tv_sec = cur_rto / 1000000;
  519         tv.tv_usec = cur_rto % 1000000;
  520         min_wait = now;
  521         timevalsub(&min_wait, &tv);
  522         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
  523                 /*
  524                  * if we hit here, we don't have enough seconds on the clock
  525                  * to account for the RTO. We just let the lower seconds be
  526                  * the bounds and don't worry about it. This may mean we
  527                  * will mark a lot more than we should.
  528                  */
  529                 min_wait.tv_sec = min_wait.tv_usec = 0;
  530         }
  531         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  532                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
  533                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
  534         }
  535         /*
  536          * Our rwnd will be incorrect here since we are not adding back the
  537          * cnt * mbuf but we will fix that down below.
  538          */
  539         orig_flight = net->flight_size;
  540         orig_tf = stcb->asoc.total_flight;
  541 
  542         net->fast_retran_ip = 0;
  543         /* Now on to each chunk */
  544         cnt_abandoned = 0;
  545         num_mk = cnt_mk = 0;
  546         tsnfirst = tsnlast = 0;
  547 #ifndef INVARIANTS
  548 start_again:
  549 #endif
  550         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
  551                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
  552                         /* Strange case our list got out of order? */
  553                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x",
  554                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
  555                         recovery_cnt++;
  556 #ifdef INVARIANTS
  557                         panic("last acked >= chk on sent-Q");
  558 #else
  559                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
  560                         sctp_recover_sent_list(stcb);
  561                         if (recovery_cnt < 10) {
  562                                 goto start_again;
  563                         } else {
  564                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
  565                         }
  566 #endif
  567                 }
  568                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
  569                         /*
  570                          * found one to mark: If it is less than
  571                          * DATAGRAM_ACKED it MUST not be a skipped or marked
  572                          * TSN but instead one that is either already set
  573                          * for retransmission OR one that needs
  574                          * retransmission.
  575                          */
  576 
  577                         /* validate its been outstanding long enough */
  578                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  579                                 sctp_log_fr(chk->rec.data.TSN_seq,
  580                                     chk->sent_rcv_time.tv_sec,
  581                                     chk->sent_rcv_time.tv_usec,
  582                                     SCTP_FR_T3_MARK_TIME);
  583                         }
  584                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
  585                                 /*
  586                                  * we have reached a chunk that was sent
  587                                  * some seconds past our min.. forget it we
  588                                  * will find no more to send.
  589                                  */
  590                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  591                                         sctp_log_fr(0,
  592                                             chk->sent_rcv_time.tv_sec,
  593                                             chk->sent_rcv_time.tv_usec,
  594                                             SCTP_FR_T3_STOPPED);
  595                                 }
  596                                 continue;
  597                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
  598                             (window_probe == 0)) {
  599                                 /*
  600                                  * we must look at the micro seconds to
  601                                  * know.
  602                                  */
  603                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
  604                                         /*
  605                                          * ok it was sent after our boundary
  606                                          * time.
  607                                          */
  608                                         continue;
  609                                 }
  610                         }
  611                         if (stcb->asoc.peer_supports_prsctp && PR_SCTP_TTL_ENABLED(chk->flags)) {
  612                                 /* Is it expired? */
  613                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
  614                                         /* Yes so drop it */
  615                                         if (chk->data) {
  616                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  617                                                     chk,
  618                                                     (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
  619                                                     SCTP_SO_NOT_LOCKED);
  620                                                 cnt_abandoned++;
  621                                         }
  622                                         continue;
  623                                 }
  624                         }
  625                         if (stcb->asoc.peer_supports_prsctp && PR_SCTP_RTX_ENABLED(chk->flags)) {
  626                                 /* Has it been retransmitted tv_sec times? */
  627                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
  628                                         if (chk->data) {
  629                                                 (void)sctp_release_pr_sctp_chunk(stcb,
  630                                                     chk,
  631                                                     (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
  632                                                     SCTP_SO_NOT_LOCKED);
  633                                                 cnt_abandoned++;
  634                                         }
  635                                         continue;
  636                                 }
  637                         }
  638                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  639                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  640                                 num_mk++;
  641                                 if (fir == 0) {
  642                                         fir = 1;
  643                                         tsnfirst = chk->rec.data.TSN_seq;
  644                                 }
  645                                 tsnlast = chk->rec.data.TSN_seq;
  646                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  647                                         sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
  648                                             0, SCTP_FR_T3_MARKED);
  649                                 }
  650                                 if (chk->rec.data.chunk_was_revoked) {
  651                                         /* deflate the cwnd */
  652                                         chk->whoTo->cwnd -= chk->book_size;
  653                                         chk->rec.data.chunk_was_revoked = 0;
  654                                 }
  655                                 net->marked_retrans++;
  656                                 stcb->asoc.marked_retrans++;
  657                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  658                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
  659                                             chk->whoTo->flight_size,
  660                                             chk->book_size,
  661                                             (uintptr_t) chk->whoTo,
  662                                             chk->rec.data.TSN_seq);
  663                                 }
  664                                 sctp_flight_size_decrease(chk);
  665                                 sctp_total_flight_decrease(stcb, chk);
  666                                 stcb->asoc.peers_rwnd += chk->send_size;
  667                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
  668                         }
  669                         chk->sent = SCTP_DATAGRAM_RESEND;
  670                         SCTP_STAT_INCR(sctps_markedretrans);
  671 
  672                         /* reset the TSN for striking and other FR stuff */
  673                         chk->rec.data.doing_fast_retransmit = 0;
  674                         /* Clear any time so NO RTT is being done */
  675 
  676                         if (chk->do_rtt) {
  677                                 if (chk->whoTo->rto_needed == 0) {
  678                                         chk->whoTo->rto_needed = 1;
  679                                 }
  680                         }
  681                         chk->do_rtt = 0;
  682                         if (alt != net) {
  683                                 sctp_free_remote_addr(chk->whoTo);
  684                                 chk->no_fr_allowed = 1;
  685                                 chk->whoTo = alt;
  686                                 atomic_add_int(&alt->ref_count, 1);
  687                         } else {
  688                                 chk->no_fr_allowed = 0;
  689                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
  690                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
  691                                 } else {
  692                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
  693                                 }
  694                         }
  695                         /*
  696                          * CMT: Do not allow FRs on retransmitted TSNs.
  697                          */
  698                         if (stcb->asoc.sctp_cmt_on_off > 0) {
  699                                 chk->no_fr_allowed = 1;
  700                         }
  701 #ifdef THIS_SHOULD_NOT_BE_DONE
  702                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
  703                         /* remember highest acked one */
  704                         could_be_sent = chk;
  705 #endif
  706                 }
  707                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  708                         cnt_mk++;
  709                 }
  710         }
  711         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
  712                 /* we did not subtract the same things? */
  713                 audit_tf = 1;
  714         }
  715         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  716                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
  717         }
  718 #ifdef SCTP_DEBUG
  719         if (num_mk) {
  720                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  721                     tsnlast);
  722                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
  723                     num_mk, (u_long)stcb->asoc.peers_rwnd);
  724                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
  725                     tsnlast);
  726                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
  727                     num_mk,
  728                     (int)stcb->asoc.peers_rwnd);
  729         }
  730 #endif
  731         *num_marked = num_mk;
  732         *num_abandoned = cnt_abandoned;
  733         /*
  734          * Now check for a ECN Echo that may be stranded And include the
  735          * cnt_mk'd to have all resends in the control queue.
  736          */
  737         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
  738                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  739                         cnt_mk++;
  740                 }
  741                 if ((chk->whoTo == net) &&
  742                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
  743                         sctp_free_remote_addr(chk->whoTo);
  744                         chk->whoTo = alt;
  745                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
  746                                 chk->sent = SCTP_DATAGRAM_RESEND;
  747                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  748                                 cnt_mk++;
  749                         }
  750                         atomic_add_int(&alt->ref_count, 1);
  751                 }
  752         }
  753 #ifdef THIS_SHOULD_NOT_BE_DONE
  754         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
  755                 /* fix it so we retransmit the highest acked anyway */
  756                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
  757                 cnt_mk++;
  758                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
  759         }
  760 #endif
  761         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
  762 #ifdef INVARIANTS
  763                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
  764                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
  765 #endif
  766 #ifndef SCTP_AUDITING_ENABLED
  767                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
  768 #endif
  769         }
  770         if (audit_tf) {
  771                 SCTPDBG(SCTP_DEBUG_TIMER4,
  772                     "Audit total flight due to negative value net:%p\n",
  773                     net);
  774                 stcb->asoc.total_flight = 0;
  775                 stcb->asoc.total_flight_count = 0;
  776                 /* Clear all networks flight size */
  777                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
  778                         lnets->flight_size = 0;
  779                         SCTPDBG(SCTP_DEBUG_TIMER4,
  780                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
  781                             lnets, lnets->cwnd, lnets->ssthresh);
  782                 }
  783                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  784                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
  785                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
  786                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
  787                                             chk->whoTo->flight_size,
  788                                             chk->book_size,
  789                                             (uintptr_t) chk->whoTo,
  790                                             chk->rec.data.TSN_seq);
  791                                 }
  792                                 sctp_flight_size_increase(chk);
  793                                 sctp_total_flight_increase(stcb, chk);
  794                         }
  795                 }
  796         }
  797         /* We return 1 if we only have a window probe outstanding */
  798         return (0);
  799 }
  800 
  801 
  802 int
  803 sctp_t3rxt_timer(struct sctp_inpcb *inp,
  804     struct sctp_tcb *stcb,
  805     struct sctp_nets *net)
  806 {
  807         struct sctp_nets *alt;
  808         int win_probe, num_mk, num_abandoned;
  809 
  810         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
  811                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
  812         }
  813         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
  814                 struct sctp_nets *lnet;
  815 
  816                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
  817                         if (net == lnet) {
  818                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
  819                         } else {
  820                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
  821                         }
  822                 }
  823         }
  824         /* Find an alternate and mark those for retransmission */
  825         if ((stcb->asoc.peers_rwnd == 0) &&
  826             (stcb->asoc.total_flight < net->mtu)) {
  827                 SCTP_STAT_INCR(sctps_timowindowprobe);
  828                 win_probe = 1;
  829         } else {
  830                 win_probe = 0;
  831         }
  832 
  833         if (win_probe == 0) {
  834                 /* We don't do normal threshold management on window probes */
  835                 if (sctp_threshold_management(inp, stcb, net,
  836                     stcb->asoc.max_send_times)) {
  837                         /* Association was destroyed */
  838                         return (1);
  839                 } else {
  840                         if (net != stcb->asoc.primary_destination) {
  841                                 /* send a immediate HB if our RTO is stale */
  842                                 struct timeval now;
  843                                 unsigned int ms_goneby;
  844 
  845                                 (void)SCTP_GETTIME_TIMEVAL(&now);
  846                                 if (net->last_sent_time.tv_sec) {
  847                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
  848                                 } else {
  849                                         ms_goneby = 0;
  850                                 }
  851                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
  852                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
  853                                                 /*
  854                                                  * no recent feed back in an
  855                                                  * RTO or more, request a
  856                                                  * RTT update
  857                                                  */
  858                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
  859                                         }
  860                                 }
  861                         }
  862                 }
  863         } else {
  864                 /*
  865                  * For a window probe we don't penalize the net's but only
  866                  * the association. This may fail it if SACKs are not coming
  867                  * back. If sack's are coming with rwnd locked at 0, we will
  868                  * continue to hold things waiting for rwnd to raise
  869                  */
  870                 if (sctp_threshold_management(inp, stcb, NULL,
  871                     stcb->asoc.max_send_times)) {
  872                         /* Association was destroyed */
  873                         return (1);
  874                 }
  875         }
  876         if (stcb->asoc.sctp_cmt_on_off > 0) {
  877                 if (net->pf_threshold < net->failure_threshold) {
  878                         alt = sctp_find_alternate_net(stcb, net, 2);
  879                 } else {
  880                         /*
  881                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
  882                          * being used, then pick dest with largest ssthresh
  883                          * for any retransmission.
  884                          */
  885                         alt = sctp_find_alternate_net(stcb, net, 1);
  886                         /*
  887                          * CUCv2: If a different dest is picked for the
  888                          * retransmission, then new (rtx-)pseudo_cumack
  889                          * needs to be tracked for orig dest. Let CUCv2
  890                          * track new (rtx-) pseudo-cumack always.
  891                          */
  892                         net->find_pseudo_cumack = 1;
  893                         net->find_rtx_pseudo_cumack = 1;
  894                 }
  895         } else {
  896                 alt = sctp_find_alternate_net(stcb, net, 0);
  897         }
  898 
  899         num_mk = 0;
  900         num_abandoned = 0;
  901         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
  902             &num_mk, &num_abandoned);
  903         /* FR Loss recovery just ended with the T3. */
  904         stcb->asoc.fast_retran_loss_recovery = 0;
  905 
  906         /* CMT FR loss recovery ended with the T3 */
  907         net->fast_retran_loss_recovery = 0;
  908         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
  909             (net->flight_size == 0)) {
  910                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
  911         }
  912         /*
  913          * setup the sat loss recovery that prevents satellite cwnd advance.
  914          */
  915         stcb->asoc.sat_t3_loss_recovery = 1;
  916         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
  917 
  918         /* Backoff the timer and cwnd */
  919         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
  920         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
  921             (net->dest_state & SCTP_ADDR_PF)) {
  922                 /* Move all pending over too */
  923                 sctp_move_chunks_from_net(stcb, net);
  924 
  925                 /*
  926                  * Get the address that failed, to force a new src address
  927                  * selecton and a route allocation.
  928                  */
  929                 if (net->ro._s_addr) {
  930                         sctp_free_ifa(net->ro._s_addr);
  931                         net->ro._s_addr = NULL;
  932                 }
  933                 net->src_addr_selected = 0;
  934 
  935                 /* Force a route allocation too */
  936                 if (net->ro.ro_rt) {
  937                         RTFREE(net->ro.ro_rt);
  938                         net->ro.ro_rt = NULL;
  939                 }
  940                 /* Was it our primary? */
  941                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
  942                         /*
  943                          * Yes, note it as such and find an alternate note:
  944                          * this means HB code must use this to resent the
  945                          * primary if it goes active AND if someone does a
  946                          * change-primary then this flag must be cleared
  947                          * from any net structures.
  948                          */
  949                         if (stcb->asoc.alternate) {
  950                                 sctp_free_remote_addr(stcb->asoc.alternate);
  951                         }
  952                         stcb->asoc.alternate = alt;
  953                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
  954                 }
  955         }
  956         /*
  957          * Special case for cookie-echo'ed case, we don't do output but must
  958          * await the COOKIE-ACK before retransmission
  959          */
  960         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
  961                 /*
  962                  * Here we just reset the timer and start again since we
  963                  * have not established the asoc
  964                  */
  965                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
  966                 return (0);
  967         }
  968         if (stcb->asoc.peer_supports_prsctp) {
  969                 struct sctp_tmit_chunk *lchk;
  970 
  971                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
  972                 /* C3. See if we need to send a Fwd-TSN */
  973                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
  974                         send_forward_tsn(stcb, &stcb->asoc);
  975                         if (lchk) {
  976                                 /* Assure a timer is up */
  977                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
  978                         }
  979                 }
  980         }
  981         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
  982                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
  983         }
  984         return (0);
  985 }
  986 
  987 int
  988 sctp_t1init_timer(struct sctp_inpcb *inp,
  989     struct sctp_tcb *stcb,
  990     struct sctp_nets *net)
  991 {
  992         /* bump the thresholds */
  993         if (stcb->asoc.delayed_connection) {
  994                 /*
  995                  * special hook for delayed connection. The library did NOT
  996                  * complete the rest of its sends.
  997                  */
  998                 stcb->asoc.delayed_connection = 0;
  999                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1000                 return (0);
 1001         }
 1002         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
 1003                 return (0);
 1004         }
 1005         if (sctp_threshold_management(inp, stcb, net,
 1006             stcb->asoc.max_init_times)) {
 1007                 /* Association was destroyed */
 1008                 return (1);
 1009         }
 1010         stcb->asoc.dropped_special_cnt = 0;
 1011         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
 1012         if (stcb->asoc.initial_init_rto_max < net->RTO) {
 1013                 net->RTO = stcb->asoc.initial_init_rto_max;
 1014         }
 1015         if (stcb->asoc.numnets > 1) {
 1016                 /* If we have more than one addr use it */
 1017                 struct sctp_nets *alt;
 1018 
 1019                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
 1020                 if (alt != stcb->asoc.primary_destination) {
 1021                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
 1022                         stcb->asoc.primary_destination = alt;
 1023                 }
 1024         }
 1025         /* Send out a new init */
 1026         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 1027         return (0);
 1028 }
 1029 
 1030 /*
 1031  * For cookie and asconf we actually need to find and mark for resend, then
 1032  * increment the resend counter (after all the threshold management stuff of
 1033  * course).
 1034  */
 1035 int
 1036 sctp_cookie_timer(struct sctp_inpcb *inp,
 1037     struct sctp_tcb *stcb,
 1038     struct sctp_nets *net SCTP_UNUSED)
 1039 {
 1040         struct sctp_nets *alt;
 1041         struct sctp_tmit_chunk *cookie;
 1042 
 1043         /* first before all else we must find the cookie */
 1044         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
 1045                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 1046                         break;
 1047                 }
 1048         }
 1049         if (cookie == NULL) {
 1050                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 1051                         /* FOOBAR! */
 1052                         struct mbuf *oper;
 1053 
 1054                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 1055                             0, M_DONTWAIT, 1, MT_DATA);
 1056                         if (oper) {
 1057                                 struct sctp_paramhdr *ph;
 1058                                 uint32_t *ippp;
 1059 
 1060                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 1061                                     sizeof(uint32_t);
 1062                                 ph = mtod(oper, struct sctp_paramhdr *);
 1063                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1064                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
 1065                                 ippp = (uint32_t *) (ph + 1);
 1066                                 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
 1067                         }
 1068                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4;
 1069                         sctp_abort_an_association(inp, stcb, SCTP_INTERNAL_ERROR,
 1070                             oper, SCTP_SO_NOT_LOCKED);
 1071                 } else {
 1072 #ifdef INVARIANTS
 1073                         panic("Cookie timer expires in wrong state?");
 1074 #else
 1075                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
 1076                         return (0);
 1077 #endif
 1078                 }
 1079                 return (0);
 1080         }
 1081         /* Ok we found the cookie, threshold management next */
 1082         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
 1083             stcb->asoc.max_init_times)) {
 1084                 /* Assoc is over */
 1085                 return (1);
 1086         }
 1087         /*
 1088          * cleared theshold management now lets backoff the address & select
 1089          * an alternate
 1090          */
 1091         stcb->asoc.dropped_special_cnt = 0;
 1092         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
 1093         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
 1094         if (alt != cookie->whoTo) {
 1095                 sctp_free_remote_addr(cookie->whoTo);
 1096                 cookie->whoTo = alt;
 1097                 atomic_add_int(&alt->ref_count, 1);
 1098         }
 1099         /* Now mark the retran info */
 1100         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
 1101                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1102         }
 1103         cookie->sent = SCTP_DATAGRAM_RESEND;
 1104         /*
 1105          * Now call the output routine to kick out the cookie again, Note we
 1106          * don't mark any chunks for retran so that FR will need to kick in
 1107          * to move these (or a send timer).
 1108          */
 1109         return (0);
 1110 }
 1111 
 1112 int
 1113 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1114     struct sctp_nets *net)
 1115 {
 1116         struct sctp_nets *alt;
 1117         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
 1118 
 1119         if (stcb->asoc.stream_reset_outstanding == 0) {
 1120                 return (0);
 1121         }
 1122         /* find the existing STRRESET, we use the seq number we sent out on */
 1123         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
 1124         if (strrst == NULL) {
 1125                 return (0);
 1126         }
 1127         /* do threshold management */
 1128         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
 1129             stcb->asoc.max_send_times)) {
 1130                 /* Assoc is over */
 1131                 return (1);
 1132         }
 1133         /*
 1134          * cleared theshold management now lets backoff the address & select
 1135          * an alternate
 1136          */
 1137         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
 1138         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
 1139         sctp_free_remote_addr(strrst->whoTo);
 1140         strrst->whoTo = alt;
 1141         atomic_add_int(&alt->ref_count, 1);
 1142 
 1143         /* See if a ECN Echo is also stranded */
 1144         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1145                 if ((chk->whoTo == net) &&
 1146                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1147                         sctp_free_remote_addr(chk->whoTo);
 1148                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1149                                 chk->sent = SCTP_DATAGRAM_RESEND;
 1150                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1151                         }
 1152                         chk->whoTo = alt;
 1153                         atomic_add_int(&alt->ref_count, 1);
 1154                 }
 1155         }
 1156         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1157                 /*
 1158                  * If the address went un-reachable, we need to move to
 1159                  * alternates for ALL chk's in queue
 1160                  */
 1161                 sctp_move_chunks_from_net(stcb, 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 
 1168         /* restart the timer */
 1169         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
 1170         return (0);
 1171 }
 1172 
 1173 int
 1174 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1175     struct sctp_nets *net)
 1176 {
 1177         struct sctp_nets *alt;
 1178         struct sctp_tmit_chunk *asconf, *chk;
 1179 
 1180         /* is this a first send, or a retransmission? */
 1181         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
 1182                 /* compose a new ASCONF chunk and send it */
 1183                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
 1184         } else {
 1185                 /*
 1186                  * Retransmission of the existing ASCONF is needed
 1187                  */
 1188 
 1189                 /* find the existing ASCONF */
 1190                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
 1191                 if (asconf == NULL) {
 1192                         return (0);
 1193                 }
 1194                 /* do threshold management */
 1195                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
 1196                     stcb->asoc.max_send_times)) {
 1197                         /* Assoc is over */
 1198                         return (1);
 1199                 }
 1200                 if (asconf->snd_count > stcb->asoc.max_send_times) {
 1201                         /*
 1202                          * Something is rotten: our peer is not responding
 1203                          * to ASCONFs but apparently is to other chunks.
 1204                          * i.e. it is not properly handling the chunk type
 1205                          * upper bits. Mark this peer as ASCONF incapable
 1206                          * and cleanup.
 1207                          */
 1208                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
 1209                         sctp_asconf_cleanup(stcb, net);
 1210                         return (0);
 1211                 }
 1212                 /*
 1213                  * cleared threshold management, so now backoff the net and
 1214                  * select an alternate
 1215                  */
 1216                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
 1217                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
 1218                 if (asconf->whoTo != alt) {
 1219                         sctp_free_remote_addr(asconf->whoTo);
 1220                         asconf->whoTo = alt;
 1221                         atomic_add_int(&alt->ref_count, 1);
 1222                 }
 1223                 /* See if an ECN Echo is also stranded */
 1224                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 1225                         if ((chk->whoTo == net) &&
 1226                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 1227                                 sctp_free_remote_addr(chk->whoTo);
 1228                                 chk->whoTo = alt;
 1229                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 1230                                         chk->sent = SCTP_DATAGRAM_RESEND;
 1231                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1232                                 }
 1233                                 atomic_add_int(&alt->ref_count, 1);
 1234                         }
 1235                 }
 1236                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
 1237                         if (chk->whoTo != alt) {
 1238                                 sctp_free_remote_addr(chk->whoTo);
 1239                                 chk->whoTo = alt;
 1240                                 atomic_add_int(&alt->ref_count, 1);
 1241                         }
 1242                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
 1243                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1244                         chk->sent = SCTP_DATAGRAM_RESEND;
 1245                 }
 1246                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
 1247                         /*
 1248                          * If the address went un-reachable, we need to move
 1249                          * to the alternate for ALL chunks in queue
 1250                          */
 1251                         sctp_move_chunks_from_net(stcb, net);
 1252                 }
 1253                 /* mark the retran info */
 1254                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
 1255                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 1256                 asconf->sent = SCTP_DATAGRAM_RESEND;
 1257 
 1258                 /* send another ASCONF if any and we can do */
 1259                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
 1260         }
 1261         return (0);
 1262 }
 1263 
 1264 /* Mobility adaptation */
 1265 void
 1266 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1267     struct sctp_nets *net SCTP_UNUSED)
 1268 {
 1269         if (stcb->asoc.deleted_primary == NULL) {
 1270                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
 1271                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1272                 return;
 1273         }
 1274         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
 1275         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
 1276         sctp_free_remote_addr(stcb->asoc.deleted_primary);
 1277         stcb->asoc.deleted_primary = NULL;
 1278         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
 1279         return;
 1280 }
 1281 
 1282 /*
 1283  * For the shutdown and shutdown-ack, we do not keep one around on the
 1284  * control queue. This means we must generate a new one and call the general
 1285  * chunk output routine, AFTER having done threshold management.
 1286  * It is assumed that net is non-NULL.
 1287  */
 1288 int
 1289 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1290     struct sctp_nets *net)
 1291 {
 1292         struct sctp_nets *alt;
 1293 
 1294         /* first threshold managment */
 1295         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1296                 /* Assoc is over */
 1297                 return (1);
 1298         }
 1299         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1300         /* second select an alternative */
 1301         alt = sctp_find_alternate_net(stcb, net, 0);
 1302 
 1303         /* third generate a shutdown into the queue for out net */
 1304         sctp_send_shutdown(stcb, alt);
 1305 
 1306         /* fourth restart timer */
 1307         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
 1308         return (0);
 1309 }
 1310 
 1311 int
 1312 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1313     struct sctp_nets *net)
 1314 {
 1315         struct sctp_nets *alt;
 1316 
 1317         /* first threshold managment */
 1318         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1319                 /* Assoc is over */
 1320                 return (1);
 1321         }
 1322         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1323         /* second select an alternative */
 1324         alt = sctp_find_alternate_net(stcb, net, 0);
 1325 
 1326         /* third generate a shutdown into the queue for out net */
 1327         sctp_send_shutdown_ack(stcb, alt);
 1328 
 1329         /* fourth restart timer */
 1330         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
 1331         return (0);
 1332 }
 1333 
 1334 static void
 1335 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
 1336     struct sctp_tcb *stcb)
 1337 {
 1338         struct sctp_stream_queue_pending *sp;
 1339         unsigned int i, chks_in_queue = 0;
 1340         int being_filled = 0;
 1341 
 1342         /*
 1343          * This function is ONLY called when the send/sent queues are empty.
 1344          */
 1345         if ((stcb == NULL) || (inp == NULL))
 1346                 return;
 1347 
 1348         if (stcb->asoc.sent_queue_retran_cnt) {
 1349                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
 1350                     stcb->asoc.sent_queue_retran_cnt);
 1351                 stcb->asoc.sent_queue_retran_cnt = 0;
 1352         }
 1353         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1354                 /* No stream scheduler information, initialize scheduler */
 1355                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
 1356                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
 1357                         /* yep, we lost a stream or two */
 1358                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
 1359                 } else {
 1360                         /* no streams lost */
 1361                         stcb->asoc.total_output_queue_size = 0;
 1362                 }
 1363         }
 1364         /* Check to see if some data queued, if so report it */
 1365         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 1366                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 1367                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 1368                                 if (sp->msg_is_complete)
 1369                                         being_filled++;
 1370                                 chks_in_queue++;
 1371                         }
 1372                 }
 1373         }
 1374         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
 1375                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
 1376                     stcb->asoc.stream_queue_cnt, chks_in_queue);
 1377         }
 1378         if (chks_in_queue) {
 1379                 /* call the output queue function */
 1380                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
 1381                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1382                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1383                         /*
 1384                          * Probably should go in and make it go back through
 1385                          * and add fragments allowed
 1386                          */
 1387                         if (being_filled == 0) {
 1388                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
 1389                                     chks_in_queue);
 1390                         }
 1391                 }
 1392         } else {
 1393                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
 1394                     (u_long)stcb->asoc.total_output_queue_size);
 1395                 stcb->asoc.total_output_queue_size = 0;
 1396         }
 1397 }
 1398 
 1399 int
 1400 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 1401     struct sctp_nets *net)
 1402 {
 1403         uint8_t net_was_pf;
 1404 
 1405         if (net->dest_state & SCTP_ADDR_PF) {
 1406                 net_was_pf = 1;
 1407         } else {
 1408                 net_was_pf = 0;
 1409         }
 1410         if (net->hb_responded == 0) {
 1411                 if (net->ro._s_addr) {
 1412                         /*
 1413                          * Invalidate the src address if we did not get a
 1414                          * response last time.
 1415                          */
 1416                         sctp_free_ifa(net->ro._s_addr);
 1417                         net->ro._s_addr = NULL;
 1418                         net->src_addr_selected = 0;
 1419                 }
 1420                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
 1421                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
 1422                         /* Assoc is over */
 1423                         return (1);
 1424                 }
 1425         }
 1426         /* Zero PBA, if it needs it */
 1427         if (net->partial_bytes_acked) {
 1428                 net->partial_bytes_acked = 0;
 1429         }
 1430         if ((stcb->asoc.total_output_queue_size > 0) &&
 1431             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
 1432             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
 1433                 sctp_audit_stream_queues_for_size(inp, stcb);
 1434         }
 1435         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
 1436             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
 1437                 /*
 1438                  * when move to PF during threshold mangement, a HB has been
 1439                  * queued in that routine
 1440                  */
 1441                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 1442         }
 1443         return (0);
 1444 }
 1445 
 1446 void
 1447 sctp_pathmtu_timer(struct sctp_inpcb *inp,
 1448     struct sctp_tcb *stcb,
 1449     struct sctp_nets *net)
 1450 {
 1451         uint32_t next_mtu, mtu;
 1452 
 1453         next_mtu = sctp_get_next_mtu(net->mtu);
 1454 
 1455         if ((next_mtu > net->mtu) && (net->port == 0)) {
 1456                 if ((net->src_addr_selected == 0) ||
 1457                     (net->ro._s_addr == NULL) ||
 1458                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1459                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
 1460                                 sctp_free_ifa(net->ro._s_addr);
 1461                                 net->ro._s_addr = NULL;
 1462                                 net->src_addr_selected = 0;
 1463                         } else if (net->ro._s_addr == NULL) {
 1464 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1465                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1466                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1467 
 1468                                         /* KAME hack: embed scopeid */
 1469                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
 1470                                 }
 1471 #endif
 1472 
 1473                                 net->ro._s_addr = sctp_source_address_selection(inp,
 1474                                     stcb,
 1475                                     (sctp_route_t *) & net->ro,
 1476                                     net, 0, stcb->asoc.vrf_id);
 1477 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
 1478                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 1479                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1480 
 1481                                         (void)sa6_recoverscope(sin6);
 1482                                 }
 1483 #endif                          /* INET6 */
 1484                         }
 1485                         if (net->ro._s_addr)
 1486                                 net->src_addr_selected = 1;
 1487                 }
 1488                 if (net->ro._s_addr) {
 1489                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
 1490                         if (net->port) {
 1491                                 mtu -= sizeof(struct udphdr);
 1492                         }
 1493                         if (mtu > next_mtu) {
 1494                                 net->mtu = next_mtu;
 1495                         }
 1496                 }
 1497         }
 1498         /* restart the timer */
 1499         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 1500 }
 1501 
 1502 void
 1503 sctp_autoclose_timer(struct sctp_inpcb *inp,
 1504     struct sctp_tcb *stcb,
 1505     struct sctp_nets *net)
 1506 {
 1507         struct timeval tn, *tim_touse;
 1508         struct sctp_association *asoc;
 1509         int ticks_gone_by;
 1510 
 1511         (void)SCTP_GETTIME_TIMEVAL(&tn);
 1512         if (stcb->asoc.sctp_autoclose_ticks &&
 1513             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 1514                 /* Auto close is on */
 1515                 asoc = &stcb->asoc;
 1516                 /* pick the time to use */
 1517                 if (asoc->time_last_rcvd.tv_sec >
 1518                     asoc->time_last_sent.tv_sec) {
 1519                         tim_touse = &asoc->time_last_rcvd;
 1520                 } else {
 1521                         tim_touse = &asoc->time_last_sent;
 1522                 }
 1523                 /* Now has long enough transpired to autoclose? */
 1524                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
 1525                 if ((ticks_gone_by > 0) &&
 1526                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
 1527                         /*
 1528                          * autoclose time has hit, call the output routine,
 1529                          * which should do nothing just to be SURE we don't
 1530                          * have hanging data. We can then safely check the
 1531                          * queues and know that we are clear to send
 1532                          * shutdown
 1533                          */
 1534                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
 1535                         /* Are we clean? */
 1536                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 1537                             TAILQ_EMPTY(&asoc->sent_queue)) {
 1538                                 /*
 1539                                  * there is nothing queued to send, so I'm
 1540                                  * done...
 1541                                  */
 1542                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
 1543                                         /* only send SHUTDOWN 1st time thru */
 1544                                         struct sctp_nets *netp;
 1545 
 1546                                         if (stcb->asoc.alternate) {
 1547                                                 netp = stcb->asoc.alternate;
 1548                                         } else {
 1549                                                 netp = stcb->asoc.primary_destination;
 1550                                         }
 1551                                         sctp_send_shutdown(stcb, netp);
 1552                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 1553                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 1554                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 1555                                         }
 1556                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 1557                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 1558                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 1559                                             stcb->sctp_ep, stcb,
 1560                                             netp);
 1561                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 1562                                             stcb->sctp_ep, stcb,
 1563                                             netp);
 1564                                 }
 1565                         }
 1566                 } else {
 1567                         /*
 1568                          * No auto close at this time, reset t-o to check
 1569                          * later
 1570                          */
 1571                         int tmp;
 1572 
 1573                         /* fool the timer startup to use the time left */
 1574                         tmp = asoc->sctp_autoclose_ticks;
 1575                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
 1576                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
 1577                             net);
 1578                         /* restore the real tick value */
 1579                         asoc->sctp_autoclose_ticks = tmp;
 1580                 }
 1581         }
 1582 }

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