sys/netinet/sctp_timer.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #define _IP_VHL
  37 #include <netinet/sctp_os.h>
  38 #include <netinet/sctp_pcb.h>
  39 #ifdef INET6
  40 #endif
  41 #include <netinet/sctp_var.h>
  42 #include <netinet/sctp_sysctl.h>
  43 #include <netinet/sctp_timer.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_header.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_input.h>
  50 #include <netinet/sctp.h>
  51 #include <netinet/sctp_uio.h>
  52 #include <netinet/udp.h>
  53
  54
  55 void
  56 sctp_audit_retranmission_queue(struct sctp_association *asoc)
  57 {
  58         struct sctp_tmit_chunk *chk;
  59
  60         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
  61             asoc->sent_queue_retran_cnt,
  62             asoc->sent_queue_cnt);
  63         asoc->sent_queue_retran_cnt = 0;
  64         asoc->sent_queue_cnt = 0;
  65         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  66                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  67                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  68                 }
  69                 asoc->sent_queue_cnt++;
  70         }
  71         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
  72                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  73                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  74                 }
  75         }
  76         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
  77                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  78                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  79                 }
  80         }
  81         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
  82             asoc->sent_queue_retran_cnt,
  83             asoc->sent_queue_cnt);
  84 }
  85
  86 int
  87 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  88     struct sctp_nets *net, uint16_t threshold)
  89 {
  90         if (net) {
  91                 net->error_count++;
  92                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
  93                     (void *)net, net->error_count,
  94                     net->failure_threshold);
  95                 if (net->error_count > net->failure_threshold) {
  96                         /* We had a threshold failure */
  97                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
  98                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
  99                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 100                                 net->dest_state &= ~SCTP_ADDR_PF;
 101                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 102                                     stcb, 0,
 103                                     (void *)net, SCTP_SO_NOT_LOCKED);
 104                         }
 105                 } else if ((net->pf_threshold < net->failure_threshold) &&
 106                     (net->error_count > net->pf_threshold)) {
 107                         if (!(net->dest_state & SCTP_ADDR_PF)) {
 108                                 net->dest_state |= SCTP_ADDR_PF;
 109                                 net->last_active = sctp_get_tick_count();
 110                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 111                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
 112                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 113                         }
 114                 }
 115         }
 116         if (stcb == NULL)
 117                 return (0);
 118
 119         if (net) {
 120                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
 121                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 122                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
 123                                     stcb->asoc.overall_error_count,
 124                                     (stcb->asoc.overall_error_count + 1),
 125                                     SCTP_FROM_SCTP_TIMER,
 126                                     __LINE__);
 127                         }
 128                         stcb->asoc.overall_error_count++;
 129                 }
 130         } else {
 131                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 132                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
 133                             stcb->asoc.overall_error_count,
 134                             (stcb->asoc.overall_error_count + 1),
 135                             SCTP_FROM_SCTP_TIMER,
 136                             __LINE__);
 137                 }
 138                 stcb->asoc.overall_error_count++;
 139         }
 140         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
 141             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
 142             (uint32_t) threshold,
 143             ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
 144         /*
 145          * We specifically do not do >= to give the assoc one more change
 146          * before we fail it.
 147          */
 148         if (stcb->asoc.overall_error_count > threshold) {
 149                 /* Abort notification sends a ULP notify */
 150                 struct mbuf *oper;
 151
 152                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 153                     0, M_DONTWAIT, 1, MT_DATA);
 154                 if (oper) {
 155                         struct sctp_paramhdr *ph;
 156                         uint32_t *ippp;
 157
 158                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 159                             sizeof(uint32_t);
 160                         ph = mtod(oper, struct sctp_paramhdr *);
 161                         ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 162                         ph->param_length = htons(SCTP_BUF_LEN(oper));
 163                         ippp = (uint32_t *) (ph + 1);
 164                         *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
 165                 }
 166                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_1;
 167                 sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
 168                 return (1);
 169         }
 170         return (0);
 171 }
 172
 173 /*
 174  * sctp_find_alternate_net() returns a non-NULL pointer as long
 175  * the argument net is non-NULL.
 176  */
 177 struct sctp_nets *
 178 sctp_find_alternate_net(struct sctp_tcb *stcb,
 179     struct sctp_nets *net,
 180     int mode)
 181 {
 182         /* Find and return an alternate network if possible */
 183         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
 184         int once;
 185
 186         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
 187         int min_errors = -1;
 188         uint32_t max_cwnd = 0;
 189
 190         if (stcb->asoc.numnets == 1) {
 191                 /* No others but net */
 192                 return (TAILQ_FIRST(&stcb->asoc.nets));
 193         }
 194         /*
 195          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
 196          * net algorithm. This algorithm chooses the active destination (not
 197          * in PF state) with the largest cwnd value. If all destinations are
 198          * in PF state, unreachable, or unconfirmed, choose the desination
 199          * that is in PF state with the lowest error count. In case of a
 200          * tie, choose the destination that was most recently active.
 201          */
 202         if (mode == 2) {
 203                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 204                         /*
 205                          * JRS 5/14/07 - If the destination is unreachable
 206                          * or unconfirmed, skip it.
 207                          */
 208                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 209                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 210                                 continue;
 211                         }
 212                         /*
 213                          * JRS 5/14/07 -  If the destination is reachable
 214                          * but in PF state, compare the error count of the
 215                          * destination to the minimum error count seen thus
 216                          * far. Store the destination with the lower error
 217                          * count.  If the error counts are equal, store the
 218                          * destination that was most recently active.
 219                          */
 220                         if (mnet->dest_state & SCTP_ADDR_PF) {
 221                                 /*
 222                                  * JRS 5/14/07 - If the destination under
 223                                  * consideration is the current destination,
 224                                  * work as if the error count is one higher.
 225                                  * The actual error count will not be
 226                                  * incremented until later in the t3
 227                                  * handler.
 228                                  */
 229                                 if (mnet == net) {
 230                                         if (min_errors == -1) {
 231                                                 min_errors = mnet->error_count + 1;
 232                                                 min_errors_net = mnet;
 233                                         } else if (mnet->error_count + 1 < min_errors) {
 234                                                 min_errors = mnet->error_count + 1;
 235                                                 min_errors_net = mnet;
 236                                         } else if (mnet->error_count + 1 == min_errors
 237                                             && mnet->last_active > min_errors_net->last_active) {
 238                                                 min_errors_net = mnet;
 239                                                 min_errors = mnet->error_count + 1;
 240                                         }
 241                                         continue;
 242                                 } else {
 243                                         if (min_errors == -1) {
 244                                                 min_errors = mnet->error_count;
 245                                                 min_errors_net = mnet;
 246                                         } else if (mnet->error_count < min_errors) {
 247                                                 min_errors = mnet->error_count;
 248                                                 min_errors_net = mnet;
 249                                         } else if (mnet->error_count == min_errors
 250                                             && mnet->last_active > min_errors_net->last_active) {
 251                                                 min_errors_net = mnet;
 252                                                 min_errors = mnet->error_count;
 253                                         }
 254                                         continue;
 255                                 }
 256                         }
 257                         /*
 258                          * JRS 5/14/07 - If the destination is reachable and
 259                          * not in PF state, compare the cwnd of the
 260                          * destination to the highest cwnd seen thus far.
 261                          * Store the destination with the higher cwnd value.
 262                          * If the cwnd values are equal, randomly choose one
 263                          * of the two destinations.
 264                          */
 265                         if (max_cwnd < mnet->cwnd) {
 266                                 max_cwnd_net = mnet;
 267                                 max_cwnd = mnet->cwnd;
 268                         } else if (max_cwnd == mnet->cwnd) {
 269                                 uint32_t rndval;
 270                                 uint8_t this_random;
 271
 272                                 if (stcb->asoc.hb_random_idx > 3) {
 273                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 274                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
 275                                         this_random = stcb->asoc.hb_random_values[0];
 276                                         stcb->asoc.hb_random_idx++;
 277                                         stcb->asoc.hb_ect_randombit = 0;
 278                                 } else {
 279                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 280                                         stcb->asoc.hb_random_idx++;
 281                                         stcb->asoc.hb_ect_randombit = 0;
 282                                 }
 283                                 if (this_random % 2 == 1) {
 284                                         max_cwnd_net = mnet;
 285                                         max_cwnd = mnet->cwnd;  /* Useless? */
 286                                 }
 287                         }
 288                 }
 289                 if (max_cwnd_net == NULL) {
 290                         if (min_errors_net == NULL) {
 291                                 return (net);
 292                         }
 293                         return (min_errors_net);
 294                 } else {
 295                         return (max_cwnd_net);
 296                 }
 297         }
 298         /*
 299          * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
 300          * choosing an alternate net.
 301          */
 302         else if (mode == 1) {
 303                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 304                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 305                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 306                                 /*
 307                                  * will skip ones that are not-reachable or
 308                                  * unconfirmed
 309                                  */
 310                                 continue;
 311                         }
 312                         if (max_cwnd < mnet->cwnd) {
 313                                 max_cwnd_net = mnet;
 314                                 max_cwnd = mnet->cwnd;
 315                         } else if (max_cwnd == mnet->cwnd) {
 316                                 uint32_t rndval;
 317                                 uint8_t this_random;
 318
 319                                 if (stcb->asoc.hb_random_idx > 3) {
 320                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 321                                         memcpy(stcb->asoc.hb_random_values, &rndval,
 322                                             sizeof(stcb->asoc.hb_random_values));
 323                                         this_random = stcb->asoc.hb_random_values[0];
 324                                         stcb->asoc.hb_random_idx = 0;
 325                                         stcb->asoc.hb_ect_randombit = 0;
 326                                 } else {
 327                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 328                                         stcb->asoc.hb_random_idx++;
 329                                         stcb->asoc.hb_ect_randombit = 0;
 330                                 }
 331                                 if (this_random % 2) {
 332                                         max_cwnd_net = mnet;
 333                                         max_cwnd = mnet->cwnd;
 334                                 }
 335                         }
 336                 }
 337                 if (max_cwnd_net) {
 338                         return (max_cwnd_net);
 339                 }
 340         }
 341         mnet = net;
 342         once = 0;
 343
 344         if (mnet == NULL) {
 345                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
 346                 if (mnet == NULL) {
 347                         return (NULL);
 348                 }
 349         }
 350         do {
 351                 alt = TAILQ_NEXT(mnet, sctp_next);
 352                 if (alt == NULL) {
 353                         once++;
 354                         if (once > 1) {
 355                                 break;
 356                         }
 357                         alt = TAILQ_FIRST(&stcb->asoc.nets);
 358                         if (alt == NULL) {
 359                                 return (NULL);
 360                         }
 361                 }
 362                 if (alt->ro.ro_rt == NULL) {
 363                         if (alt->ro._s_addr) {
 364                                 sctp_free_ifa(alt->ro._s_addr);
 365                                 alt->ro._s_addr = NULL;
 366                         }
 367                         alt->src_addr_selected = 0;
 368                 }
 369                 /* sa_ignore NO_NULL_CHK */
 370                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
 371                     (alt->ro.ro_rt != NULL) &&
 372                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 373                         /* Found a reachable address */
 374                         break;
 375                 }
 376                 mnet = alt;
 377         } while (alt != NULL);
 378
 379         if (alt == NULL) {
 380                 /* Case where NO insv network exists (dormant state) */
 381                 /* we rotate destinations */
 382                 once = 0;
 383                 mnet = net;
 384                 do {
 385                         if (mnet == NULL) {
 386                                 return (TAILQ_FIRST(&stcb->asoc.nets));
 387                         }
 388                         alt = TAILQ_NEXT(mnet, sctp_next);
 389                         if (alt == NULL) {
 390                                 once++;
 391                                 if (once > 1) {
 392                                         break;
 393                                 }
 394                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
 395                         }
 396                         /* sa_ignore NO_NULL_CHK */
 397                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 398                             (alt != net)) {
 399                                 /* Found an alternate address */
 400                                 break;
 401                         }
 402                         mnet = alt;
 403                 } while (alt != NULL);
 404         }
 405         if (alt == NULL) {
 406                 return (net);
 407         }
 408         return (alt);
 409 }
 410
 411 static void
 412 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
 413     struct sctp_nets *net,
 414     int win_probe,
 415     int num_marked, int num_abandoned)
 416 {
 417         if (net->RTO == 0) {
 418                 net->RTO = stcb->asoc.minrto;
 419         }
 420         net->RTO <<= 1;
 421         if (net->RTO > stcb->asoc.maxrto) {
 422                 net->RTO = stcb->asoc.maxrto;
 423         }
 424         if ((win_probe == 0) && (num_marked || num_abandoned)) {
 425                 /* We don't apply penalty to window probe scenarios */
 426                 /* JRS - Use the congestion control given in the CC module */
 427                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
 428         }
 429 }
 430
 431 #ifndef INVARIANTS
 432 static void
 433 sctp_recover_sent_list(struct sctp_tcb *stcb)
 434 {
 435         struct sctp_tmit_chunk *chk, *nchk;
 436         struct sctp_association *asoc;
 437
 438         asoc = &stcb->asoc;
 439         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
 440                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
 441                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
 442                             (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
 443                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
 444                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 445                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 446                                 }
 447                         }
 448                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 449                         if (chk->pr_sctp_on) {
 450                                 if (asoc->pr_sctp_cnt != 0)
 451                                         asoc->pr_sctp_cnt--;
 452                         }
 453                         if (chk->data) {
 454                                 /* sa_ignore NO_NULL_CHK */
 455                                 sctp_free_bufspace(stcb, asoc, chk, 1);
 456                                 sctp_m_freem(chk->data);
 457                                 chk->data = NULL;
 458                                 if (asoc->peer_supports_prsctp && PR_SCTP_BUF_ENABLED(chk->flags)) {
 459                                         asoc->sent_queue_cnt_removeable--;
 460                                 }
 461                         }
 462                         asoc->sent_queue_cnt--;
 463                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 464                 }
 465         }
 466         SCTP_PRINTF("after recover order is as follows\n");
 467         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 468                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
 469         }
 470 }
 471
 472 #endif
 473
 474 static int
 475 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
 476     struct sctp_nets *net,
 477     struct sctp_nets *alt,
 478     int window_probe,
 479     int *num_marked,
 480     int *num_abandoned)
 481 {
 482
 483         /*
 484          * Mark all chunks (well not all) that were sent to *net for
 485          * retransmission. Move them to alt for there destination as well...
 486          * We only mark chunks that have been outstanding long enough to
 487          * have received feed-back.
 488          */
 489         struct sctp_tmit_chunk *chk, *nchk;
 490         struct sctp_nets *lnets;
 491         struct timeval now, min_wait, tv;
 492         int cur_rto;
 493         int cnt_abandoned;
 494         int audit_tf, num_mk, fir;
 495         unsigned int cnt_mk;
 496         uint32_t orig_flight, orig_tf;
 497         uint32_t tsnlast, tsnfirst;
 498         int recovery_cnt = 0;
 499
 500
 501         /* none in flight now */
 502         audit_tf = 0;
 503         fir = 0;
 504         /*
 505          * figure out how long a data chunk must be pending before we can
 506          * mark it ..
 507          */
 508         (void)SCTP_GETTIME_TIMEVAL(&now);
 509         /* get cur rto in micro-seconds */
 510         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
 511         cur_rto *= 1000;
 512         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 513                 sctp_log_fr(cur_rto,
 514                     stcb->asoc.peers_rwnd,
 515                     window_probe,
 516                     SCTP_FR_T3_MARK_TIME);
 517                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
 518                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
 519         }
 520         tv.tv_sec = cur_rto / 1000000;
 521         tv.tv_usec = cur_rto % 1000000;
 522         min_wait = now;
 523         timevalsub(&min_wait, &tv);
 524         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
 525                 /*
 526                  * if we hit here, we don't have enough seconds on the clock
 527                  * to account for the RTO. We just let the lower seconds be
 528                  * the bounds and don't worry about it. This may mean we
 529                  * will mark a lot more than we should.
 530                  */
 531                 min_wait.tv_sec = min_wait.tv_usec = 0;
 532         }
 533         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 534                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
 535                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
 536         }
 537         /*
 538          * Our rwnd will be incorrect here since we are not adding back the
 539          * cnt * mbuf but we will fix that down below.
 540          */
 541         orig_flight = net->flight_size;
 542         orig_tf = stcb->asoc.total_flight;
 543
 544         net->fast_retran_ip = 0;
 545         /* Now on to each chunk */
 546         cnt_abandoned = 0;
 547         num_mk = cnt_mk = 0;
 548         tsnfirst = tsnlast = 0;
 549 #ifndef INVARIANTS
 550 start_again:
 551 #endif
 552         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
 553                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
 554                         /* Strange case our list got out of order? */
 555                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x",
 556                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
 557                         recovery_cnt++;
 558 #ifdef INVARIANTS
 559                         panic("last acked >= chk on sent-Q");
 560 #else
 561                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
 562                         sctp_recover_sent_list(stcb);
 563                         if (recovery_cnt < 10) {
 564                                 goto start_again;
 565                         } else {
 566                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
 567                         }
 568 #endif
 569                 }
 570                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
 571                         /*
 572                          * found one to mark: If it is less than
 573                          * DATAGRAM_ACKED it MUST not be a skipped or marked
 574                          * TSN but instead one that is either already set
 575                          * for retransmission OR one that needs
 576                          * retransmission.
 577                          */
 578
 579                         /* validate its been outstanding long enough */
 580                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 581                                 sctp_log_fr(chk->rec.data.TSN_seq,
 582                                     chk->sent_rcv_time.tv_sec,
 583                                     chk->sent_rcv_time.tv_usec,
 584                                     SCTP_FR_T3_MARK_TIME);
 585                         }
 586                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
 587                                 /*
 588                                  * we have reached a chunk that was sent
 589                                  * some seconds past our min.. forget it we
 590                                  * will find no more to send.
 591                                  */
 592                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 593                                         sctp_log_fr(0,
 594                                             chk->sent_rcv_time.tv_sec,
 595                                             chk->sent_rcv_time.tv_usec,
 596                                             SCTP_FR_T3_STOPPED);
 597                                 }
 598                                 continue;
 599                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
 600                             (window_probe == 0)) {
 601                                 /*
 602                                  * we must look at the micro seconds to
 603                                  * know.
 604                                  */
 605                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
 606                                         /*
 607                                          * ok it was sent after our boundary
 608                                          * time.
 609                                          */
 610                                         continue;
 611                                 }
 612                         }
 613                         if (stcb->asoc.peer_supports_prsctp && PR_SCTP_TTL_ENABLED(chk->flags)) {
 614                                 /* Is it expired? */
 615                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
 616                                         /* Yes so drop it */
 617                                         if (chk->data) {
 618                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 619                                                     chk,
 620                                                     1,
 621                                                     SCTP_SO_NOT_LOCKED);
 622                                                 cnt_abandoned++;
 623                                         }
 624                                         continue;
 625                                 }
 626                         }
 627                         if (stcb->asoc.peer_supports_prsctp && PR_SCTP_RTX_ENABLED(chk->flags)) {
 628                                 /* Has it been retransmitted tv_sec times? */
 629                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
 630                                         if (chk->data) {
 631                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 632                                                     chk,
 633                                                     1,
 634                                                     SCTP_SO_NOT_LOCKED);
 635                                                 cnt_abandoned++;
 636                                         }
 637                                         continue;
 638                                 }
 639                         }
 640                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 641                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 642                                 num_mk++;
 643                                 if (fir == 0) {
 644                                         fir = 1;
 645                                         tsnfirst = chk->rec.data.TSN_seq;
 646                                 }
 647                                 tsnlast = chk->rec.data.TSN_seq;
 648                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 649                                         sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
 650                                             0, SCTP_FR_T3_MARKED);
 651                                 }
 652                                 if (chk->rec.data.chunk_was_revoked) {
 653                                         /* deflate the cwnd */
 654                                         chk->whoTo->cwnd -= chk->book_size;
 655                                         chk->rec.data.chunk_was_revoked = 0;
 656                                 }
 657                                 net->marked_retrans++;
 658                                 stcb->asoc.marked_retrans++;
 659                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 660                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
 661                                             chk->whoTo->flight_size,
 662                                             chk->book_size,
 663                                             (uintptr_t) chk->whoTo,
 664                                             chk->rec.data.TSN_seq);
 665                                 }
 666                                 sctp_flight_size_decrease(chk);
 667                                 sctp_total_flight_decrease(stcb, chk);
 668                                 stcb->asoc.peers_rwnd += chk->send_size;
 669                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
 670                         }
 671                         chk->sent = SCTP_DATAGRAM_RESEND;
 672                         SCTP_STAT_INCR(sctps_markedretrans);
 673
 674                         /* reset the TSN for striking and other FR stuff */
 675                         chk->rec.data.doing_fast_retransmit = 0;
 676                         /* Clear any time so NO RTT is being done */
 677
 678                         if (chk->do_rtt) {
 679                                 if (chk->whoTo->rto_needed == 0) {
 680                                         chk->whoTo->rto_needed = 1;
 681                                 }
 682                         }
 683                         chk->do_rtt = 0;
 684                         if (alt != net) {
 685                                 sctp_free_remote_addr(chk->whoTo);
 686                                 chk->no_fr_allowed = 1;
 687                                 chk->whoTo = alt;
 688                                 atomic_add_int(&alt->ref_count, 1);
 689                         } else {
 690                                 chk->no_fr_allowed = 0;
 691                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 692                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 693                                 } else {
 694                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
 695                                 }
 696                         }
 697                         /*
 698                          * CMT: Do not allow FRs on retransmitted TSNs.
 699                          */
 700                         if (stcb->asoc.sctp_cmt_on_off > 0) {
 701                                 chk->no_fr_allowed = 1;
 702                         }
 703 #ifdef THIS_SHOULD_NOT_BE_DONE
 704                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
 705                         /* remember highest acked one */
 706                         could_be_sent = chk;
 707 #endif
 708                 }
 709                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 710                         cnt_mk++;
 711                 }
 712         }
 713         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
 714                 /* we did not subtract the same things? */
 715                 audit_tf = 1;
 716         }
 717         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 718                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
 719         }
 720 #ifdef SCTP_DEBUG
 721         if (num_mk) {
 722                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 723                     tsnlast);
 724                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
 725                     num_mk, (u_long)stcb->asoc.peers_rwnd);
 726                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 727                     tsnlast);
 728                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
 729                     num_mk,
 730                     (int)stcb->asoc.peers_rwnd);
 731         }
 732 #endif
 733         *num_marked = num_mk;
 734         *num_abandoned = cnt_abandoned;
 735         /*
 736          * Now check for a ECN Echo that may be stranded And include the
 737          * cnt_mk'd to have all resends in the control queue.
 738          */
 739         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 740                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 741                         cnt_mk++;
 742                 }
 743                 if ((chk->whoTo == net) &&
 744                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 745                         sctp_free_remote_addr(chk->whoTo);
 746                         chk->whoTo = alt;
 747                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 748                                 chk->sent = SCTP_DATAGRAM_RESEND;
 749                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 750                                 cnt_mk++;
 751                         }
 752                         atomic_add_int(&alt->ref_count, 1);
 753                 }
 754         }
 755 #ifdef THIS_SHOULD_NOT_BE_DONE
 756         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
 757                 /* fix it so we retransmit the highest acked anyway */
 758                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 759                 cnt_mk++;
 760                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
 761         }
 762 #endif
 763         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
 764 #ifdef INVARIANTS
 765                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
 766                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
 767 #endif
 768 #ifndef SCTP_AUDITING_ENABLED
 769                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
 770 #endif
 771         }
 772         if (audit_tf) {
 773                 SCTPDBG(SCTP_DEBUG_TIMER4,
 774                     "Audit total flight due to negative value net:%p\n",
 775                     (void *)net);
 776                 stcb->asoc.total_flight = 0;
 777                 stcb->asoc.total_flight_count = 0;
 778                 /* Clear all networks flight size */
 779                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
 780                         lnets->flight_size = 0;
 781                         SCTPDBG(SCTP_DEBUG_TIMER4,
 782                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
 783                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
 784                 }
 785                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 786                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 787                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 788                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 789                                             chk->whoTo->flight_size,
 790                                             chk->book_size,
 791                                             (uintptr_t) chk->whoTo,
 792                                             chk->rec.data.TSN_seq);
 793                                 }
 794                                 sctp_flight_size_increase(chk);
 795                                 sctp_total_flight_increase(stcb, chk);
 796                         }
 797                 }
 798         }
 799         /* We return 1 if we only have a window probe outstanding */
 800         return (0);
 801 }
 802
 803
 804 int
 805 sctp_t3rxt_timer(struct sctp_inpcb *inp,
 806     struct sctp_tcb *stcb,
 807     struct sctp_nets *net)
 808 {
 809         struct sctp_nets *alt;
 810         int win_probe, num_mk, num_abandoned;
 811
 812         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 813                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
 814         }
 815         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 816                 struct sctp_nets *lnet;
 817
 818                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
 819                         if (net == lnet) {
 820                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
 821                         } else {
 822                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
 823                         }
 824                 }
 825         }
 826         /* Find an alternate and mark those for retransmission */
 827         if ((stcb->asoc.peers_rwnd == 0) &&
 828             (stcb->asoc.total_flight < net->mtu)) {
 829                 SCTP_STAT_INCR(sctps_timowindowprobe);
 830                 win_probe = 1;
 831         } else {
 832                 win_probe = 0;
 833         }
 834
 835         if (win_probe == 0) {
 836                 /* We don't do normal threshold management on window probes */
 837                 if (sctp_threshold_management(inp, stcb, net,
 838                     stcb->asoc.max_send_times)) {
 839                         /* Association was destroyed */
 840                         return (1);
 841                 } else {
 842                         if (net != stcb->asoc.primary_destination) {
 843                                 /* send a immediate HB if our RTO is stale */
 844                                 struct timeval now;
 845                                 unsigned int ms_goneby;
 846
 847                                 (void)SCTP_GETTIME_TIMEVAL(&now);
 848                                 if (net->last_sent_time.tv_sec) {
 849                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
 850                                 } else {
 851                                         ms_goneby = 0;
 852                                 }
 853                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
 854                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
 855                                                 /*
 856                                                  * no recent feed back in an
 857                                                  * RTO or more, request a
 858                                                  * RTT update
 859                                                  */
 860                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 861                                         }
 862                                 }
 863                         }
 864                 }
 865         } else {
 866                 /*
 867                  * For a window probe we don't penalize the net's but only
 868                  * the association. This may fail it if SACKs are not coming
 869                  * back. If sack's are coming with rwnd locked at 0, we will
 870                  * continue to hold things waiting for rwnd to raise
 871                  */
 872                 if (sctp_threshold_management(inp, stcb, NULL,
 873                     stcb->asoc.max_send_times)) {
 874                         /* Association was destroyed */
 875                         return (1);
 876                 }
 877         }
 878         if (stcb->asoc.sctp_cmt_on_off > 0) {
 879                 if (net->pf_threshold < net->failure_threshold) {
 880                         alt = sctp_find_alternate_net(stcb, net, 2);
 881                 } else {
 882                         /*
 883                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
 884                          * being used, then pick dest with largest ssthresh
 885                          * for any retransmission.
 886                          */
 887                         alt = sctp_find_alternate_net(stcb, net, 1);
 888                         /*
 889                          * CUCv2: If a different dest is picked for the
 890                          * retransmission, then new (rtx-)pseudo_cumack
 891                          * needs to be tracked for orig dest. Let CUCv2
 892                          * track new (rtx-) pseudo-cumack always.
 893                          */
 894                         net->find_pseudo_cumack = 1;
 895                         net->find_rtx_pseudo_cumack = 1;
 896                 }
 897         } else {
 898                 alt = sctp_find_alternate_net(stcb, net, 0);
 899         }
 900
 901         num_mk = 0;
 902         num_abandoned = 0;
 903         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
 904             &num_mk, &num_abandoned);
 905         /* FR Loss recovery just ended with the T3. */
 906         stcb->asoc.fast_retran_loss_recovery = 0;
 907
 908         /* CMT FR loss recovery ended with the T3 */
 909         net->fast_retran_loss_recovery = 0;
 910         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 911             (net->flight_size == 0)) {
 912                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 913         }
 914         /*
 915          * setup the sat loss recovery that prevents satellite cwnd advance.
 916          */
 917         stcb->asoc.sat_t3_loss_recovery = 1;
 918         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
 919
 920         /* Backoff the timer and cwnd */
 921         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
 922         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 923             (net->dest_state & SCTP_ADDR_PF)) {
 924                 /* Move all pending over too */
 925                 sctp_move_chunks_from_net(stcb, net);
 926
 927                 /*
 928                  * Get the address that failed, to force a new src address
 929                  * selecton and a route allocation.
 930                  */
 931                 if (net->ro._s_addr) {
 932                         sctp_free_ifa(net->ro._s_addr);
 933                         net->ro._s_addr = NULL;
 934                 }
 935                 net->src_addr_selected = 0;
 936
 937                 /* Force a route allocation too */
 938                 if (net->ro.ro_rt) {
 939                         RTFREE(net->ro.ro_rt);
 940                         net->ro.ro_rt = NULL;
 941                 }
 942                 /* Was it our primary? */
 943                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
 944                         /*
 945                          * Yes, note it as such and find an alternate note:
 946                          * this means HB code must use this to resent the
 947                          * primary if it goes active AND if someone does a
 948                          * change-primary then this flag must be cleared
 949                          * from any net structures.
 950                          */
 951                         if (stcb->asoc.alternate) {
 952                                 sctp_free_remote_addr(stcb->asoc.alternate);
 953                         }
 954                         stcb->asoc.alternate = alt;
 955                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 956                 }
 957         }
 958         /*
 959          * Special case for cookie-echo'ed case, we don't do output but must
 960          * await the COOKIE-ACK before retransmission
 961          */
 962         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 963                 /*
 964                  * Here we just reset the timer and start again since we
 965                  * have not established the asoc
 966                  */
 967                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 968                 return (0);
 969         }
 970         if (stcb->asoc.peer_supports_prsctp) {
 971                 struct sctp_tmit_chunk *lchk;
 972
 973                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
 974                 /* C3. See if we need to send a Fwd-TSN */
 975                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
 976                         send_forward_tsn(stcb, &stcb->asoc);
 977                         if (lchk) {
 978                                 /* Assure a timer is up */
 979                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
 980                         }
 981                 }
 982         }
 983         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
 984                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
 985         }
 986         return (0);
 987 }
 988
 989 int
 990 sctp_t1init_timer(struct sctp_inpcb *inp,
 991     struct sctp_tcb *stcb,
 992     struct sctp_nets *net)
 993 {
 994         /* bump the thresholds */
 995         if (stcb->asoc.delayed_connection) {
 996                 /*
 997                  * special hook for delayed connection. The library did NOT
 998                  * complete the rest of its sends.
 999                  */
1000                 stcb->asoc.delayed_connection = 0;
1001                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1002                 return (0);
1003         }
1004         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
1005                 return (0);
1006         }
1007         if (sctp_threshold_management(inp, stcb, net,
1008             stcb->asoc.max_init_times)) {
1009                 /* Association was destroyed */
1010                 return (1);
1011         }
1012         stcb->asoc.dropped_special_cnt = 0;
1013         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1014         if (stcb->asoc.initial_init_rto_max < net->RTO) {
1015                 net->RTO = stcb->asoc.initial_init_rto_max;
1016         }
1017         if (stcb->asoc.numnets > 1) {
1018                 /* If we have more than one addr use it */
1019                 struct sctp_nets *alt;
1020
1021                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1022                 if (alt != stcb->asoc.primary_destination) {
1023                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1024                         stcb->asoc.primary_destination = alt;
1025                 }
1026         }
1027         /* Send out a new init */
1028         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1029         return (0);
1030 }
1031
1032 /*
1033  * For cookie and asconf we actually need to find and mark for resend, then
1034  * increment the resend counter (after all the threshold management stuff of
1035  * course).
1036  */
1037 int
1038 sctp_cookie_timer(struct sctp_inpcb *inp,
1039     struct sctp_tcb *stcb,
1040     struct sctp_nets *net SCTP_UNUSED)
1041 {
1042         struct sctp_nets *alt;
1043         struct sctp_tmit_chunk *cookie;
1044
1045         /* first before all else we must find the cookie */
1046         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1047                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1048                         break;
1049                 }
1050         }
1051         if (cookie == NULL) {
1052                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1053                         /* FOOBAR! */
1054                         struct mbuf *oper;
1055
1056                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
1057                             0, M_DONTWAIT, 1, MT_DATA);
1058                         if (oper) {
1059                                 struct sctp_paramhdr *ph;
1060                                 uint32_t *ippp;
1061
1062                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
1063                                     sizeof(uint32_t);
1064                                 ph = mtod(oper, struct sctp_paramhdr *);
1065                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
1066                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
1067                                 ippp = (uint32_t *) (ph + 1);
1068                                 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
1069                         }
1070                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4;
1071                         sctp_abort_an_association(inp, stcb, oper, SCTP_SO_NOT_LOCKED);
1072                 } else {
1073 #ifdef INVARIANTS
1074                         panic("Cookie timer expires in wrong state?");
1075 #else
1076                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1077                         return (0);
1078 #endif
1079                 }
1080                 return (0);
1081         }
1082         /* Ok we found the cookie, threshold management next */
1083         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1084             stcb->asoc.max_init_times)) {
1085                 /* Assoc is over */
1086                 return (1);
1087         }
1088         /*
1089          * cleared theshold management now lets backoff the address & select
1090          * an alternate
1091          */
1092         stcb->asoc.dropped_special_cnt = 0;
1093         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1094         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1095         if (alt != cookie->whoTo) {
1096                 sctp_free_remote_addr(cookie->whoTo);
1097                 cookie->whoTo = alt;
1098                 atomic_add_int(&alt->ref_count, 1);
1099         }
1100         /* Now mark the retran info */
1101         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1102                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1103         }
1104         cookie->sent = SCTP_DATAGRAM_RESEND;
1105         /*
1106          * Now call the output routine to kick out the cookie again, Note we
1107          * don't mark any chunks for retran so that FR will need to kick in
1108          * to move these (or a send timer).
1109          */
1110         return (0);
1111 }
1112
1113 int
1114 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1115     struct sctp_nets *net)
1116 {
1117         struct sctp_nets *alt;
1118         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1119
1120         if (stcb->asoc.stream_reset_outstanding == 0) {
1121                 return (0);
1122         }
1123         /* find the existing STRRESET, we use the seq number we sent out on */
1124         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1125         if (strrst == NULL) {
1126                 return (0);
1127         }
1128         /* do threshold management */
1129         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1130             stcb->asoc.max_send_times)) {
1131                 /* Assoc is over */
1132                 return (1);
1133         }
1134         /*
1135          * cleared theshold management now lets backoff the address & select
1136          * an alternate
1137          */
1138         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1139         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1140         sctp_free_remote_addr(strrst->whoTo);
1141         strrst->whoTo = alt;
1142         atomic_add_int(&alt->ref_count, 1);
1143
1144         /* See if a ECN Echo is also stranded */
1145         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1146                 if ((chk->whoTo == net) &&
1147                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1148                         sctp_free_remote_addr(chk->whoTo);
1149                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
1150                                 chk->sent = SCTP_DATAGRAM_RESEND;
1151                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1152                         }
1153                         chk->whoTo = alt;
1154                         atomic_add_int(&alt->ref_count, 1);
1155                 }
1156         }
1157         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1158                 /*
1159                  * If the address went un-reachable, we need to move to
1160                  * alternates for ALL chk's in queue
1161                  */
1162                 sctp_move_chunks_from_net(stcb, net);
1163         }
1164         /* mark the retran info */
1165         if (strrst->sent != SCTP_DATAGRAM_RESEND)
1166                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1167         strrst->sent = SCTP_DATAGRAM_RESEND;
1168
1169         /* restart the timer */
1170         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1171         return (0);
1172 }
1173
1174 int
1175 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1176     struct sctp_nets *net)
1177 {
1178         struct sctp_nets *alt;
1179         struct sctp_tmit_chunk *asconf, *chk;
1180
1181         /* is this a first send, or a retransmission? */
1182         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1183                 /* compose a new ASCONF chunk and send it */
1184                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1185         } else {
1186                 /*
1187                  * Retransmission of the existing ASCONF is needed
1188                  */
1189
1190                 /* find the existing ASCONF */
1191                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1192                 if (asconf == NULL) {
1193                         return (0);
1194                 }
1195                 /* do threshold management */
1196                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1197                     stcb->asoc.max_send_times)) {
1198                         /* Assoc is over */
1199                         return (1);
1200                 }
1201                 if (asconf->snd_count > stcb->asoc.max_send_times) {
1202                         /*
1203                          * Something is rotten: our peer is not responding
1204                          * to ASCONFs but apparently is to other chunks.
1205                          * i.e. it is not properly handling the chunk type
1206                          * upper bits. Mark this peer as ASCONF incapable
1207                          * and cleanup.
1208                          */
1209                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1210                         sctp_asconf_cleanup(stcb, net);
1211                         return (0);
1212                 }
1213                 /*
1214                  * cleared threshold management, so now backoff the net and
1215                  * select an alternate
1216                  */
1217                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1218                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1219                 if (asconf->whoTo != alt) {
1220                         sctp_free_remote_addr(asconf->whoTo);
1221                         asconf->whoTo = alt;
1222                         atomic_add_int(&alt->ref_count, 1);
1223                 }
1224                 /* See if an ECN Echo is also stranded */
1225                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1226                         if ((chk->whoTo == net) &&
1227                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1228                                 sctp_free_remote_addr(chk->whoTo);
1229                                 chk->whoTo = alt;
1230                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1231                                         chk->sent = SCTP_DATAGRAM_RESEND;
1232                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1233                                 }
1234                                 atomic_add_int(&alt->ref_count, 1);
1235                         }
1236                 }
1237                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1238                         if (chk->whoTo != alt) {
1239                                 sctp_free_remote_addr(chk->whoTo);
1240                                 chk->whoTo = alt;
1241                                 atomic_add_int(&alt->ref_count, 1);
1242                         }
1243                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1244                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1245                         chk->sent = SCTP_DATAGRAM_RESEND;
1246                 }
1247                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1248                         /*
1249                          * If the address went un-reachable, we need to move
1250                          * to the alternate for ALL chunks in queue
1251                          */
1252                         sctp_move_chunks_from_net(stcb, net);
1253                 }
1254                 /* mark the retran info */
1255                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1256                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1257                 asconf->sent = SCTP_DATAGRAM_RESEND;
1258
1259                 /* send another ASCONF if any and we can do */
1260                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1261         }
1262         return (0);
1263 }
1264
1265 /* Mobility adaptation */
1266 void
1267 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1268     struct sctp_nets *net SCTP_UNUSED)
1269 {
1270         if (stcb->asoc.deleted_primary == NULL) {
1271                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1272                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1273                 return;
1274         }
1275         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1276         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1277         sctp_free_remote_addr(stcb->asoc.deleted_primary);
1278         stcb->asoc.deleted_primary = NULL;
1279         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1280         return;
1281 }
1282
1283 /*
1284  * For the shutdown and shutdown-ack, we do not keep one around on the
1285  * control queue. This means we must generate a new one and call the general
1286  * chunk output routine, AFTER having done threshold management.
1287  * It is assumed that net is non-NULL.
1288  */
1289 int
1290 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1291     struct sctp_nets *net)
1292 {
1293         struct sctp_nets *alt;
1294
1295         /* first threshold managment */
1296         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1297                 /* Assoc is over */
1298                 return (1);
1299         }
1300         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1301         /* second select an alternative */
1302         alt = sctp_find_alternate_net(stcb, net, 0);
1303
1304         /* third generate a shutdown into the queue for out net */
1305         sctp_send_shutdown(stcb, alt);
1306
1307         /* fourth restart timer */
1308         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1309         return (0);
1310 }
1311
1312 int
1313 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1314     struct sctp_nets *net)
1315 {
1316         struct sctp_nets *alt;
1317
1318         /* first threshold managment */
1319         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1320                 /* Assoc is over */
1321                 return (1);
1322         }
1323         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1324         /* second select an alternative */
1325         alt = sctp_find_alternate_net(stcb, net, 0);
1326
1327         /* third generate a shutdown into the queue for out net */
1328         sctp_send_shutdown_ack(stcb, alt);
1329
1330         /* fourth restart timer */
1331         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1332         return (0);
1333 }
1334
1335 static void
1336 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1337     struct sctp_tcb *stcb)
1338 {
1339         struct sctp_stream_queue_pending *sp;
1340         unsigned int i, chks_in_queue = 0;
1341         int being_filled = 0;
1342
1343         /*
1344          * This function is ONLY called when the send/sent queues are empty.
1345          */
1346         if ((stcb == NULL) || (inp == NULL))
1347                 return;
1348
1349         if (stcb->asoc.sent_queue_retran_cnt) {
1350                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1351                     stcb->asoc.sent_queue_retran_cnt);
1352                 stcb->asoc.sent_queue_retran_cnt = 0;
1353         }
1354         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1355                 /* No stream scheduler information, initialize scheduler */
1356                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1357                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1358                         /* yep, we lost a stream or two */
1359                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1360                 } else {
1361                         /* no streams lost */
1362                         stcb->asoc.total_output_queue_size = 0;
1363                 }
1364         }
1365         /* Check to see if some data queued, if so report it */
1366         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1367                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1368                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1369                                 if (sp->msg_is_complete)
1370                                         being_filled++;
1371                                 chks_in_queue++;
1372                         }
1373                 }
1374         }
1375         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1376                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1377                     stcb->asoc.stream_queue_cnt, chks_in_queue);
1378         }
1379         if (chks_in_queue) {
1380                 /* call the output queue function */
1381                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1382                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1383                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1384                         /*
1385                          * Probably should go in and make it go back through
1386                          * and add fragments allowed
1387                          */
1388                         if (being_filled == 0) {
1389                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1390                                     chks_in_queue);
1391                         }
1392                 }
1393         } else {
1394                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1395                     (u_long)stcb->asoc.total_output_queue_size);
1396                 stcb->asoc.total_output_queue_size = 0;
1397         }
1398 }
1399
1400 int
1401 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1402     struct sctp_nets *net)
1403 {
1404         uint8_t net_was_pf;
1405
1406         if (net->dest_state & SCTP_ADDR_PF) {
1407                 net_was_pf = 1;
1408         } else {
1409                 net_was_pf = 0;
1410         }
1411         if (net->hb_responded == 0) {
1412                 if (net->ro._s_addr) {
1413                         /*
1414                          * Invalidate the src address if we did not get a
1415                          * response last time.
1416                          */
1417                         sctp_free_ifa(net->ro._s_addr);
1418                         net->ro._s_addr = NULL;
1419                         net->src_addr_selected = 0;
1420                 }
1421                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1422                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1423                         /* Assoc is over */
1424                         return (1);
1425                 }
1426         }
1427         /* Zero PBA, if it needs it */
1428         if (net->partial_bytes_acked) {
1429                 net->partial_bytes_acked = 0;
1430         }
1431         if ((stcb->asoc.total_output_queue_size > 0) &&
1432             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1433             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1434                 sctp_audit_stream_queues_for_size(inp, stcb);
1435         }
1436         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1437             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1438                 /*
1439                  * when move to PF during threshold mangement, a HB has been
1440                  * queued in that routine
1441                  */
1442                 uint32_t ms_gone_by;
1443
1444                 if ((net->last_sent_time.tv_sec > 0) ||
1445                     (net->last_sent_time.tv_usec > 0)) {
1446                         struct timeval diff;
1447
1448                         SCTP_GETTIME_TIMEVAL(&diff);
1449                         timevalsub(&diff, &net->last_sent_time);
1450                         ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
1451                             (uint32_t) (diff.tv_usec / 1000);
1452                 } else {
1453                         ms_gone_by = 0xffffffff;
1454                 }
1455                 if ((ms_gone_by >= net->heart_beat_delay) ||
1456                     (net->dest_state & SCTP_ADDR_PF)) {
1457                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1458                 }
1459         }
1460         return (0);
1461 }
1462
1463 void
1464 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1465     struct sctp_tcb *stcb,
1466     struct sctp_nets *net)
1467 {
1468         uint32_t next_mtu, mtu;
1469
1470         next_mtu = sctp_get_next_mtu(net->mtu);
1471
1472         if ((next_mtu > net->mtu) && (net->port == 0)) {
1473                 if ((net->src_addr_selected == 0) ||
1474                     (net->ro._s_addr == NULL) ||
1475                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1476                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1477                                 sctp_free_ifa(net->ro._s_addr);
1478                                 net->ro._s_addr = NULL;
1479                                 net->src_addr_selected = 0;
1480                         } else if (net->ro._s_addr == NULL) {
1481 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1482                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1483                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1484
1485                                         /* KAME hack: embed scopeid */
1486                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1487                                 }
1488 #endif
1489
1490                                 net->ro._s_addr = sctp_source_address_selection(inp,
1491                                     stcb,
1492                                     (sctp_route_t *) & net->ro,
1493                                     net, 0, stcb->asoc.vrf_id);
1494 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1495                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1496                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1497
1498                                         (void)sa6_recoverscope(sin6);
1499                                 }
1500 #endif                          /* INET6 */
1501                         }
1502                         if (net->ro._s_addr)
1503                                 net->src_addr_selected = 1;
1504                 }
1505                 if (net->ro._s_addr) {
1506                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1507                         if (net->port) {
1508                                 mtu -= sizeof(struct udphdr);
1509                         }
1510                         if (mtu > next_mtu) {
1511                                 net->mtu = next_mtu;
1512                         }
1513                 }
1514         }
1515         /* restart the timer */
1516         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1517 }
1518
1519 void
1520 sctp_autoclose_timer(struct sctp_inpcb *inp,
1521     struct sctp_tcb *stcb,
1522     struct sctp_nets *net)
1523 {
1524         struct timeval tn, *tim_touse;
1525         struct sctp_association *asoc;
1526         int ticks_gone_by;
1527
1528         (void)SCTP_GETTIME_TIMEVAL(&tn);
1529         if (stcb->asoc.sctp_autoclose_ticks &&
1530             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1531                 /* Auto close is on */
1532                 asoc = &stcb->asoc;
1533                 /* pick the time to use */
1534                 if (asoc->time_last_rcvd.tv_sec >
1535                     asoc->time_last_sent.tv_sec) {
1536                         tim_touse = &asoc->time_last_rcvd;
1537                 } else {
1538                         tim_touse = &asoc->time_last_sent;
1539                 }
1540                 /* Now has long enough transpired to autoclose? */
1541                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1542                 if ((ticks_gone_by > 0) &&
1543                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1544                         /*
1545                          * autoclose time has hit, call the output routine,
1546                          * which should do nothing just to be SURE we don't
1547                          * have hanging data. We can then safely check the
1548                          * queues and know that we are clear to send
1549                          * shutdown
1550                          */
1551                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1552                         /* Are we clean? */
1553                         if (TAILQ_EMPTY(&asoc->send_queue) &&
1554                             TAILQ_EMPTY(&asoc->sent_queue)) {
1555                                 /*
1556                                  * there is nothing queued to send, so I'm
1557                                  * done...
1558                                  */
1559                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1560                                         /* only send SHUTDOWN 1st time thru */
1561                                         struct sctp_nets *netp;
1562
1563                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1564                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1565                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1566                                         }
1567                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1568                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1569                                         sctp_stop_timers_for_shutdown(stcb);
1570                                         if (stcb->asoc.alternate) {
1571                                                 netp = stcb->asoc.alternate;
1572                                         } else {
1573                                                 netp = stcb->asoc.primary_destination;
1574                                         }
1575                                         sctp_send_shutdown(stcb, netp);
1576                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1577                                             stcb->sctp_ep, stcb,
1578                                             netp);
1579                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1580                                             stcb->sctp_ep, stcb,
1581                                             netp);
1582                                 }
1583                         }
1584                 } else {
1585                         /*
1586                          * No auto close at this time, reset t-o to check
1587                          * later
1588                          */
1589                         int tmp;
1590
1591                         /* fool the timer startup to use the time left */
1592                         tmp = asoc->sctp_autoclose_ticks;
1593                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
1594                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1595                             net);
1596                         /* restore the real tick value */
1597                         asoc->sctp_autoclose_ticks = tmp;
1598                 }
1599         }
1600 }