sys/netinet/sctp_timer.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #define _IP_VHL
  39 #include <netinet/sctp_os.h>
  40 #include <netinet/sctp_pcb.h>
  41 #ifdef INET6
  42 #endif
  43 #include <netinet/sctp_var.h>
  44 #include <netinet/sctp_sysctl.h>
  45 #include <netinet/sctp_timer.h>
  46 #include <netinet/sctputil.h>
  47 #include <netinet/sctp_output.h>
  48 #include <netinet/sctp_header.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp.h>
  53 #include <netinet/sctp_uio.h>
  54 #if defined(INET) || defined(INET6)
  55 #include <netinet/udp.h>
  56 #endif
  57
  58
  59 void
  60 sctp_audit_retranmission_queue(struct sctp_association *asoc)
  61 {
  62         struct sctp_tmit_chunk *chk;
  63
  64         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
  65             asoc->sent_queue_retran_cnt,
  66             asoc->sent_queue_cnt);
  67         asoc->sent_queue_retran_cnt = 0;
  68         asoc->sent_queue_cnt = 0;
  69         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  70                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  71                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  72                 }
  73                 asoc->sent_queue_cnt++;
  74         }
  75         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
  76                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  77                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  78                 }
  79         }
  80         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
  81                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  82                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  83                 }
  84         }
  85         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
  86             asoc->sent_queue_retran_cnt,
  87             asoc->sent_queue_cnt);
  88 }
  89
  90 static int
  91 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  92     struct sctp_nets *net, uint16_t threshold)
  93 {
  94         if (net) {
  95                 net->error_count++;
  96                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
  97                     (void *)net, net->error_count,
  98                     net->failure_threshold);
  99                 if (net->error_count > net->failure_threshold) {
 100                         /* We had a threshold failure */
 101                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 102                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 103                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 104                                 net->dest_state &= ~SCTP_ADDR_PF;
 105                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 106                                     stcb, 0,
 107                                     (void *)net, SCTP_SO_NOT_LOCKED);
 108                         }
 109                 } else if ((net->pf_threshold < net->failure_threshold) &&
 110                     (net->error_count > net->pf_threshold)) {
 111                         if (!(net->dest_state & SCTP_ADDR_PF)) {
 112                                 net->dest_state |= SCTP_ADDR_PF;
 113                                 net->last_active = sctp_get_tick_count();
 114                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 115                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
 116                                     inp, stcb, net,
 117                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
 118                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
 119                         }
 120                 }
 121         }
 122         if (stcb == NULL)
 123                 return (0);
 124
 125         if (net) {
 126                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
 127                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 128                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
 129                                     stcb->asoc.overall_error_count,
 130                                     (stcb->asoc.overall_error_count + 1),
 131                                     SCTP_FROM_SCTP_TIMER,
 132                                     __LINE__);
 133                         }
 134                         stcb->asoc.overall_error_count++;
 135                 }
 136         } else {
 137                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 138                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
 139                             stcb->asoc.overall_error_count,
 140                             (stcb->asoc.overall_error_count + 1),
 141                             SCTP_FROM_SCTP_TIMER,
 142                             __LINE__);
 143                 }
 144                 stcb->asoc.overall_error_count++;
 145         }
 146         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
 147             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
 148             (uint32_t)threshold,
 149             ((net == NULL) ? (uint32_t)0 : (uint32_t)net->dest_state));
 150         /*
 151          * We specifically do not do >= to give the assoc one more change
 152          * before we fail it.
 153          */
 154         if (stcb->asoc.overall_error_count > threshold) {
 155                 /* Abort notification sends a ULP notify */
 156                 struct mbuf *op_err;
 157
 158                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 159                     "Association error counter exceeded");
 160                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
 161                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 162                 return (1);
 163         }
 164         return (0);
 165 }
 166
 167 /*
 168  * sctp_find_alternate_net() returns a non-NULL pointer as long
 169  * the argument net is non-NULL.
 170  */
 171 struct sctp_nets *
 172 sctp_find_alternate_net(struct sctp_tcb *stcb,
 173     struct sctp_nets *net,
 174     int mode)
 175 {
 176         /* Find and return an alternate network if possible */
 177         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
 178         int once;
 179
 180         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
 181         int min_errors = -1;
 182         uint32_t max_cwnd = 0;
 183
 184         if (stcb->asoc.numnets == 1) {
 185                 /* No others but net */
 186                 return (TAILQ_FIRST(&stcb->asoc.nets));
 187         }
 188         /*
 189          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
 190          * net algorithm. This algorithm chooses the active destination (not
 191          * in PF state) with the largest cwnd value. If all destinations are
 192          * in PF state, unreachable, or unconfirmed, choose the desination
 193          * that is in PF state with the lowest error count. In case of a
 194          * tie, choose the destination that was most recently active.
 195          */
 196         if (mode == 2) {
 197                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 198                         /*
 199                          * JRS 5/14/07 - If the destination is unreachable
 200                          * or unconfirmed, skip it.
 201                          */
 202                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 203                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 204                                 continue;
 205                         }
 206                         /*
 207                          * JRS 5/14/07 -  If the destination is reachable
 208                          * but in PF state, compare the error count of the
 209                          * destination to the minimum error count seen thus
 210                          * far. Store the destination with the lower error
 211                          * count.  If the error counts are equal, store the
 212                          * destination that was most recently active.
 213                          */
 214                         if (mnet->dest_state & SCTP_ADDR_PF) {
 215                                 /*
 216                                  * JRS 5/14/07 - If the destination under
 217                                  * consideration is the current destination,
 218                                  * work as if the error count is one higher.
 219                                  * The actual error count will not be
 220                                  * incremented until later in the t3
 221                                  * handler.
 222                                  */
 223                                 if (mnet == net) {
 224                                         if (min_errors == -1) {
 225                                                 min_errors = mnet->error_count + 1;
 226                                                 min_errors_net = mnet;
 227                                         } else if (mnet->error_count + 1 < min_errors) {
 228                                                 min_errors = mnet->error_count + 1;
 229                                                 min_errors_net = mnet;
 230                                         } else if (mnet->error_count + 1 == min_errors
 231                                             && mnet->last_active > min_errors_net->last_active) {
 232                                                 min_errors_net = mnet;
 233                                                 min_errors = mnet->error_count + 1;
 234                                         }
 235                                         continue;
 236                                 } else {
 237                                         if (min_errors == -1) {
 238                                                 min_errors = mnet->error_count;
 239                                                 min_errors_net = mnet;
 240                                         } else if (mnet->error_count < min_errors) {
 241                                                 min_errors = mnet->error_count;
 242                                                 min_errors_net = mnet;
 243                                         } else if (mnet->error_count == min_errors
 244                                             && mnet->last_active > min_errors_net->last_active) {
 245                                                 min_errors_net = mnet;
 246                                                 min_errors = mnet->error_count;
 247                                         }
 248                                         continue;
 249                                 }
 250                         }
 251                         /*
 252                          * JRS 5/14/07 - If the destination is reachable and
 253                          * not in PF state, compare the cwnd of the
 254                          * destination to the highest cwnd seen thus far.
 255                          * Store the destination with the higher cwnd value.
 256                          * If the cwnd values are equal, randomly choose one
 257                          * of the two destinations.
 258                          */
 259                         if (max_cwnd < mnet->cwnd) {
 260                                 max_cwnd_net = mnet;
 261                                 max_cwnd = mnet->cwnd;
 262                         } else if (max_cwnd == mnet->cwnd) {
 263                                 uint32_t rndval;
 264                                 uint8_t this_random;
 265
 266                                 if (stcb->asoc.hb_random_idx > 3) {
 267                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 268                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
 269                                         this_random = stcb->asoc.hb_random_values[0];
 270                                         stcb->asoc.hb_random_idx++;
 271                                         stcb->asoc.hb_ect_randombit = 0;
 272                                 } else {
 273                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 274                                         stcb->asoc.hb_random_idx++;
 275                                         stcb->asoc.hb_ect_randombit = 0;
 276                                 }
 277                                 if (this_random % 2 == 1) {
 278                                         max_cwnd_net = mnet;
 279                                         max_cwnd = mnet->cwnd;  /* Useless? */
 280                                 }
 281                         }
 282                 }
 283                 if (max_cwnd_net == NULL) {
 284                         if (min_errors_net == NULL) {
 285                                 return (net);
 286                         }
 287                         return (min_errors_net);
 288                 } else {
 289                         return (max_cwnd_net);
 290                 }
 291         }                       /* JRS 5/14/07 - If mode is set to 1, use the
 292                                  * CMT policy for choosing an alternate net. */
 293         else if (mode == 1) {
 294                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 295                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 296                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 297                                 /*
 298                                  * will skip ones that are not-reachable or
 299                                  * unconfirmed
 300                                  */
 301                                 continue;
 302                         }
 303                         if (max_cwnd < mnet->cwnd) {
 304                                 max_cwnd_net = mnet;
 305                                 max_cwnd = mnet->cwnd;
 306                         } else if (max_cwnd == mnet->cwnd) {
 307                                 uint32_t rndval;
 308                                 uint8_t this_random;
 309
 310                                 if (stcb->asoc.hb_random_idx > 3) {
 311                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 312                                         memcpy(stcb->asoc.hb_random_values, &rndval,
 313                                             sizeof(stcb->asoc.hb_random_values));
 314                                         this_random = stcb->asoc.hb_random_values[0];
 315                                         stcb->asoc.hb_random_idx = 0;
 316                                         stcb->asoc.hb_ect_randombit = 0;
 317                                 } else {
 318                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 319                                         stcb->asoc.hb_random_idx++;
 320                                         stcb->asoc.hb_ect_randombit = 0;
 321                                 }
 322                                 if (this_random % 2) {
 323                                         max_cwnd_net = mnet;
 324                                         max_cwnd = mnet->cwnd;
 325                                 }
 326                         }
 327                 }
 328                 if (max_cwnd_net) {
 329                         return (max_cwnd_net);
 330                 }
 331         }
 332         mnet = net;
 333         once = 0;
 334
 335         if (mnet == NULL) {
 336                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
 337                 if (mnet == NULL) {
 338                         return (NULL);
 339                 }
 340         }
 341         for (;;) {
 342                 alt = TAILQ_NEXT(mnet, sctp_next);
 343                 if (alt == NULL) {
 344                         once++;
 345                         if (once > 1) {
 346                                 break;
 347                         }
 348                         alt = TAILQ_FIRST(&stcb->asoc.nets);
 349                         if (alt == NULL) {
 350                                 return (NULL);
 351                         }
 352                 }
 353                 if (alt->ro.ro_rt == NULL) {
 354                         if (alt->ro._s_addr) {
 355                                 sctp_free_ifa(alt->ro._s_addr);
 356                                 alt->ro._s_addr = NULL;
 357                         }
 358                         alt->src_addr_selected = 0;
 359                 }
 360                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
 361                     (alt->ro.ro_rt != NULL) &&
 362                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 363                         /* Found a reachable address */
 364                         break;
 365                 }
 366                 mnet = alt;
 367         }
 368
 369         if (alt == NULL) {
 370                 /* Case where NO insv network exists (dormant state) */
 371                 /* we rotate destinations */
 372                 once = 0;
 373                 mnet = net;
 374                 for (;;) {
 375                         if (mnet == NULL) {
 376                                 return (TAILQ_FIRST(&stcb->asoc.nets));
 377                         }
 378                         alt = TAILQ_NEXT(mnet, sctp_next);
 379                         if (alt == NULL) {
 380                                 once++;
 381                                 if (once > 1) {
 382                                         break;
 383                                 }
 384                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
 385                                 if (alt == NULL) {
 386                                         break;
 387                                 }
 388                         }
 389                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 390                             (alt != net)) {
 391                                 /* Found an alternate address */
 392                                 break;
 393                         }
 394                         mnet = alt;
 395                 }
 396         }
 397         if (alt == NULL) {
 398                 return (net);
 399         }
 400         return (alt);
 401 }
 402
 403 static void
 404 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
 405     struct sctp_nets *net,
 406     int win_probe,
 407     int num_marked, int num_abandoned)
 408 {
 409         if (net->RTO == 0) {
 410                 if (net->RTO_measured) {
 411                         net->RTO = stcb->asoc.minrto;
 412                 } else {
 413                         net->RTO = stcb->asoc.initial_rto;
 414                 }
 415         }
 416         net->RTO <<= 1;
 417         if (net->RTO > stcb->asoc.maxrto) {
 418                 net->RTO = stcb->asoc.maxrto;
 419         }
 420         if ((win_probe == 0) && (num_marked || num_abandoned)) {
 421                 /* We don't apply penalty to window probe scenarios */
 422                 /* JRS - Use the congestion control given in the CC module */
 423                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
 424         }
 425 }
 426
 427 #ifndef INVARIANTS
 428 static void
 429 sctp_recover_sent_list(struct sctp_tcb *stcb)
 430 {
 431         struct sctp_tmit_chunk *chk, *nchk;
 432         struct sctp_association *asoc;
 433
 434         asoc = &stcb->asoc;
 435         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
 436                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
 437                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
 438                             (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
 439                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
 440                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 441                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 442                                 }
 443                         }
 444                         if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
 445                             (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
 446                             TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
 447                                 asoc->trigger_reset = 1;
 448                         }
 449                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 450                         if (PR_SCTP_ENABLED(chk->flags)) {
 451                                 if (asoc->pr_sctp_cnt != 0)
 452                                         asoc->pr_sctp_cnt--;
 453                         }
 454                         if (chk->data) {
 455                                 /* sa_ignore NO_NULL_CHK */
 456                                 sctp_free_bufspace(stcb, asoc, chk, 1);
 457                                 sctp_m_freem(chk->data);
 458                                 chk->data = NULL;
 459                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
 460                                         asoc->sent_queue_cnt_removeable--;
 461                                 }
 462                         }
 463                         asoc->sent_queue_cnt--;
 464                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 465                 }
 466         }
 467         SCTP_PRINTF("after recover order is as follows\n");
 468         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 469                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.tsn);
 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)) {
 554                         /* Strange case our list got out of order? */
 555                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
 556                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
 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,
 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.prsctp_supported && 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.prsctp_supported && 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;
 646                                 }
 647                                 tsnlast = chk->rec.data.tsn;
 648                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 649                                         sctp_log_fr(chk->rec.data.tsn, 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                                             (uint32_t)(uintptr_t)chk->whoTo,
 664                                             chk->rec.data.tsn);
 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                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 673                         SCTP_STAT_INCR(sctps_markedretrans);
 674
 675                         /* reset the TSN for striking and other FR stuff */
 676                         chk->rec.data.doing_fast_retransmit = 0;
 677                         /* Clear any time so NO RTT is being done */
 678
 679                         if (chk->do_rtt) {
 680                                 if (chk->whoTo->rto_needed == 0) {
 681                                         chk->whoTo->rto_needed = 1;
 682                                 }
 683                         }
 684                         chk->do_rtt = 0;
 685                         if (alt != net) {
 686                                 sctp_free_remote_addr(chk->whoTo);
 687                                 chk->no_fr_allowed = 1;
 688                                 chk->whoTo = alt;
 689                                 atomic_add_int(&alt->ref_count, 1);
 690                         } else {
 691                                 chk->no_fr_allowed = 0;
 692                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 693                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 694                                 } else {
 695                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
 696                                 }
 697                         }
 698                         /*
 699                          * CMT: Do not allow FRs on retransmitted TSNs.
 700                          */
 701                         if (stcb->asoc.sctp_cmt_on_off > 0) {
 702                                 chk->no_fr_allowed = 1;
 703                         }
 704 #ifdef THIS_SHOULD_NOT_BE_DONE
 705                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
 706                         /* remember highest acked one */
 707                         could_be_sent = chk;
 708 #endif
 709                 }
 710                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 711                         cnt_mk++;
 712                 }
 713         }
 714         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
 715                 /* we did not subtract the same things? */
 716                 audit_tf = 1;
 717         }
 718         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 719                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
 720         }
 721 #ifdef SCTP_DEBUG
 722         if (num_mk) {
 723                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 724                     tsnlast);
 725                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
 726                     num_mk,
 727                     stcb->asoc.peers_rwnd);
 728         }
 729 #endif
 730         *num_marked = num_mk;
 731         *num_abandoned = cnt_abandoned;
 732         /*
 733          * Now check for a ECN Echo that may be stranded And include the
 734          * cnt_mk'd to have all resends in the control queue.
 735          */
 736         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 737                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 738                         cnt_mk++;
 739                 }
 740                 if ((chk->whoTo == net) &&
 741                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 742                         sctp_free_remote_addr(chk->whoTo);
 743                         chk->whoTo = alt;
 744                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 745                                 chk->sent = SCTP_DATAGRAM_RESEND;
 746                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 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                     (void *)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                             (void *)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                                             (uint32_t)(uintptr_t)chk->whoTo,
 790                                             chk->rec.data.tsn);
 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.prsctp_supported) {
 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 *op_err;
1053
1054                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1055                             "Cookie timer expired, but no cookie");
1056                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
1057                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1058                 } else {
1059 #ifdef INVARIANTS
1060                         panic("Cookie timer expires in wrong state?");
1061 #else
1062                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1063                         return (0);
1064 #endif
1065                 }
1066                 return (0);
1067         }
1068         /* Ok we found the cookie, threshold management next */
1069         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1070             stcb->asoc.max_init_times)) {
1071                 /* Assoc is over */
1072                 return (1);
1073         }
1074         /*
1075          * Cleared threshold management, now lets backoff the address and
1076          * select an alternate
1077          */
1078         stcb->asoc.dropped_special_cnt = 0;
1079         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1080         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1081         if (alt != cookie->whoTo) {
1082                 sctp_free_remote_addr(cookie->whoTo);
1083                 cookie->whoTo = alt;
1084                 atomic_add_int(&alt->ref_count, 1);
1085         }
1086         /* Now mark the retran info */
1087         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1088                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1089         }
1090         cookie->sent = SCTP_DATAGRAM_RESEND;
1091         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1092         /*
1093          * Now call the output routine to kick out the cookie again, Note we
1094          * don't mark any chunks for retran so that FR will need to kick in
1095          * to move these (or a send timer).
1096          */
1097         return (0);
1098 }
1099
1100 int
1101 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1102     struct sctp_nets *net)
1103 {
1104         struct sctp_nets *alt;
1105         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1106
1107         if (stcb->asoc.stream_reset_outstanding == 0) {
1108                 return (0);
1109         }
1110         /* find the existing STRRESET, we use the seq number we sent out on */
1111         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1112         if (strrst == NULL) {
1113                 return (0);
1114         }
1115         /* do threshold management */
1116         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1117             stcb->asoc.max_send_times)) {
1118                 /* Assoc is over */
1119                 return (1);
1120         }
1121         /*
1122          * Cleared threshold management, now lets backoff the address and
1123          * select an alternate
1124          */
1125         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1126         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1127         sctp_free_remote_addr(strrst->whoTo);
1128         strrst->whoTo = alt;
1129         atomic_add_int(&alt->ref_count, 1);
1130
1131         /* See if a ECN Echo is also stranded */
1132         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1133                 if ((chk->whoTo == net) &&
1134                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1135                         sctp_free_remote_addr(chk->whoTo);
1136                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
1137                                 chk->sent = SCTP_DATAGRAM_RESEND;
1138                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1139                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1140                         }
1141                         chk->whoTo = alt;
1142                         atomic_add_int(&alt->ref_count, 1);
1143                 }
1144         }
1145         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1146                 /*
1147                  * If the address went un-reachable, we need to move to
1148                  * alternates for ALL chk's in queue
1149                  */
1150                 sctp_move_chunks_from_net(stcb, net);
1151         }
1152         /* mark the retran info */
1153         if (strrst->sent != SCTP_DATAGRAM_RESEND)
1154                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1155         strrst->sent = SCTP_DATAGRAM_RESEND;
1156         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1157
1158         /* restart the timer */
1159         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1160         return (0);
1161 }
1162
1163 int
1164 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1165     struct sctp_nets *net)
1166 {
1167         struct sctp_nets *alt;
1168         struct sctp_tmit_chunk *asconf, *chk;
1169
1170         /* is this a first send, or a retransmission? */
1171         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1172                 /* compose a new ASCONF chunk and send it */
1173                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1174         } else {
1175                 /*
1176                  * Retransmission of the existing ASCONF is needed
1177                  */
1178
1179                 /* find the existing ASCONF */
1180                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1181                 if (asconf == NULL) {
1182                         return (0);
1183                 }
1184                 /* do threshold management */
1185                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1186                     stcb->asoc.max_send_times)) {
1187                         /* Assoc is over */
1188                         return (1);
1189                 }
1190                 if (asconf->snd_count > stcb->asoc.max_send_times) {
1191                         /*
1192                          * Something is rotten: our peer is not responding
1193                          * to ASCONFs but apparently is to other chunks.
1194                          * i.e. it is not properly handling the chunk type
1195                          * upper bits. Mark this peer as ASCONF incapable
1196                          * and cleanup.
1197                          */
1198                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1199                         sctp_asconf_cleanup(stcb, net);
1200                         return (0);
1201                 }
1202                 /*
1203                  * cleared threshold management, so now backoff the net and
1204                  * select an alternate
1205                  */
1206                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1207                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1208                 if (asconf->whoTo != alt) {
1209                         sctp_free_remote_addr(asconf->whoTo);
1210                         asconf->whoTo = alt;
1211                         atomic_add_int(&alt->ref_count, 1);
1212                 }
1213                 /* See if an ECN Echo is also stranded */
1214                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1215                         if ((chk->whoTo == net) &&
1216                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1217                                 sctp_free_remote_addr(chk->whoTo);
1218                                 chk->whoTo = alt;
1219                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1220                                         chk->sent = SCTP_DATAGRAM_RESEND;
1221                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1222                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1223                                 }
1224                                 atomic_add_int(&alt->ref_count, 1);
1225                         }
1226                 }
1227                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1228                         if (chk->whoTo != alt) {
1229                                 sctp_free_remote_addr(chk->whoTo);
1230                                 chk->whoTo = alt;
1231                                 atomic_add_int(&alt->ref_count, 1);
1232                         }
1233                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1234                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1235                         chk->sent = SCTP_DATAGRAM_RESEND;
1236                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1237                 }
1238                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1239                         /*
1240                          * If the address went un-reachable, we need to move
1241                          * to the alternate for ALL chunks in queue
1242                          */
1243                         sctp_move_chunks_from_net(stcb, net);
1244                 }
1245                 /* mark the retran info */
1246                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1247                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1248                 asconf->sent = SCTP_DATAGRAM_RESEND;
1249                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1250
1251                 /* send another ASCONF if any and we can do */
1252                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1253         }
1254         return (0);
1255 }
1256
1257 /* Mobility adaptation */
1258 void
1259 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1260     struct sctp_nets *net SCTP_UNUSED)
1261 {
1262         if (stcb->asoc.deleted_primary == NULL) {
1263                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1264                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1265                 return;
1266         }
1267         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1268         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1269         sctp_free_remote_addr(stcb->asoc.deleted_primary);
1270         stcb->asoc.deleted_primary = NULL;
1271         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1272         return;
1273 }
1274
1275 /*
1276  * For the shutdown and shutdown-ack, we do not keep one around on the
1277  * control queue. This means we must generate a new one and call the general
1278  * chunk output routine, AFTER having done threshold management.
1279  * It is assumed that net is non-NULL.
1280  */
1281 int
1282 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1283     struct sctp_nets *net)
1284 {
1285         struct sctp_nets *alt;
1286
1287         /* first threshold management */
1288         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1289                 /* Assoc is over */
1290                 return (1);
1291         }
1292         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1293         /* second select an alternative */
1294         alt = sctp_find_alternate_net(stcb, net, 0);
1295
1296         /* third generate a shutdown into the queue for out net */
1297         sctp_send_shutdown(stcb, alt);
1298
1299         /* fourth restart timer */
1300         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1301         return (0);
1302 }
1303
1304 int
1305 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1306     struct sctp_nets *net)
1307 {
1308         struct sctp_nets *alt;
1309
1310         /* first threshold management */
1311         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1312                 /* Assoc is over */
1313                 return (1);
1314         }
1315         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1316         /* second select an alternative */
1317         alt = sctp_find_alternate_net(stcb, net, 0);
1318
1319         /* third generate a shutdown into the queue for out net */
1320         sctp_send_shutdown_ack(stcb, alt);
1321
1322         /* fourth restart timer */
1323         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1324         return (0);
1325 }
1326
1327 static void
1328 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1329     struct sctp_tcb *stcb)
1330 {
1331         struct sctp_stream_queue_pending *sp;
1332         unsigned int i, chks_in_queue = 0;
1333         int being_filled = 0;
1334
1335         /*
1336          * This function is ONLY called when the send/sent queues are empty.
1337          */
1338         if ((stcb == NULL) || (inp == NULL))
1339                 return;
1340
1341         if (stcb->asoc.sent_queue_retran_cnt) {
1342                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1343                     stcb->asoc.sent_queue_retran_cnt);
1344                 stcb->asoc.sent_queue_retran_cnt = 0;
1345         }
1346         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1347                 /* No stream scheduler information, initialize scheduler */
1348                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1349                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1350                         /* yep, we lost a stream or two */
1351                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1352                 } else {
1353                         /* no streams lost */
1354                         stcb->asoc.total_output_queue_size = 0;
1355                 }
1356         }
1357         /* Check to see if some data queued, if so report it */
1358         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1359                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1360                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1361                                 if (sp->msg_is_complete)
1362                                         being_filled++;
1363                                 chks_in_queue++;
1364                         }
1365                 }
1366         }
1367         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1368                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1369                     stcb->asoc.stream_queue_cnt, chks_in_queue);
1370         }
1371         if (chks_in_queue) {
1372                 /* call the output queue function */
1373                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1374                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1375                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1376                         /*
1377                          * Probably should go in and make it go back through
1378                          * and add fragments allowed
1379                          */
1380                         if (being_filled == 0) {
1381                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1382                                     chks_in_queue);
1383                         }
1384                 }
1385         } else {
1386                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1387                     (u_long)stcb->asoc.total_output_queue_size);
1388                 stcb->asoc.total_output_queue_size = 0;
1389         }
1390 }
1391
1392 int
1393 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1394     struct sctp_nets *net)
1395 {
1396         uint8_t net_was_pf;
1397
1398         if (net->dest_state & SCTP_ADDR_PF) {
1399                 net_was_pf = 1;
1400         } else {
1401                 net_was_pf = 0;
1402         }
1403         if (net->hb_responded == 0) {
1404                 if (net->ro._s_addr) {
1405                         /*
1406                          * Invalidate the src address if we did not get a
1407                          * response last time.
1408                          */
1409                         sctp_free_ifa(net->ro._s_addr);
1410                         net->ro._s_addr = NULL;
1411                         net->src_addr_selected = 0;
1412                 }
1413                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1414                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1415                         /* Assoc is over */
1416                         return (1);
1417                 }
1418         }
1419         /* Zero PBA, if it needs it */
1420         if (net->partial_bytes_acked) {
1421                 net->partial_bytes_acked = 0;
1422         }
1423         if ((stcb->asoc.total_output_queue_size > 0) &&
1424             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1425             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1426                 sctp_audit_stream_queues_for_size(inp, stcb);
1427         }
1428         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1429             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1430                 /*
1431                  * when move to PF during threshold mangement, a HB has been
1432                  * queued in that routine
1433                  */
1434                 uint32_t ms_gone_by;
1435
1436                 if ((net->last_sent_time.tv_sec > 0) ||
1437                     (net->last_sent_time.tv_usec > 0)) {
1438                         struct timeval diff;
1439
1440                         SCTP_GETTIME_TIMEVAL(&diff);
1441                         timevalsub(&diff, &net->last_sent_time);
1442                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
1443                             (uint32_t)(diff.tv_usec / 1000);
1444                 } else {
1445                         ms_gone_by = 0xffffffff;
1446                 }
1447                 if ((ms_gone_by >= net->heart_beat_delay) ||
1448                     (net->dest_state & SCTP_ADDR_PF)) {
1449                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1450                 }
1451         }
1452         return (0);
1453 }
1454
1455 void
1456 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1457     struct sctp_tcb *stcb,
1458     struct sctp_nets *net)
1459 {
1460         uint32_t next_mtu, mtu;
1461
1462         next_mtu = sctp_get_next_mtu(net->mtu);
1463
1464         if ((next_mtu > net->mtu) && (net->port == 0)) {
1465                 if ((net->src_addr_selected == 0) ||
1466                     (net->ro._s_addr == NULL) ||
1467                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1468                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1469                                 sctp_free_ifa(net->ro._s_addr);
1470                                 net->ro._s_addr = NULL;
1471                                 net->src_addr_selected = 0;
1472                         } else if (net->ro._s_addr == NULL) {
1473 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1474                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1475                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1476
1477                                         /* KAME hack: embed scopeid */
1478                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1479                                 }
1480 #endif
1481
1482                                 net->ro._s_addr = sctp_source_address_selection(inp,
1483                                     stcb,
1484                                     (sctp_route_t *)&net->ro,
1485                                     net, 0, stcb->asoc.vrf_id);
1486 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1487                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1488                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1489
1490                                         (void)sa6_recoverscope(sin6);
1491                                 }
1492 #endif                          /* INET6 */
1493                         }
1494                         if (net->ro._s_addr)
1495                                 net->src_addr_selected = 1;
1496                 }
1497                 if (net->ro._s_addr) {
1498                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1499 #if defined(INET) || defined(INET6)
1500                         if (net->port) {
1501                                 mtu -= sizeof(struct udphdr);
1502                         }
1503 #endif
1504                         if (mtu > next_mtu) {
1505                                 net->mtu = next_mtu;
1506                         } else {
1507                                 net->mtu = mtu;
1508                         }
1509                 }
1510         }
1511         /* restart the timer */
1512         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1513 }
1514
1515 void
1516 sctp_autoclose_timer(struct sctp_inpcb *inp,
1517     struct sctp_tcb *stcb,
1518     struct sctp_nets *net)
1519 {
1520         struct timeval tn, *tim_touse;
1521         struct sctp_association *asoc;
1522         int ticks_gone_by;
1523
1524         (void)SCTP_GETTIME_TIMEVAL(&tn);
1525         if (stcb->asoc.sctp_autoclose_ticks &&
1526             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1527                 /* Auto close is on */
1528                 asoc = &stcb->asoc;
1529                 /* pick the time to use */
1530                 if (asoc->time_last_rcvd.tv_sec >
1531                     asoc->time_last_sent.tv_sec) {
1532                         tim_touse = &asoc->time_last_rcvd;
1533                 } else {
1534                         tim_touse = &asoc->time_last_sent;
1535                 }
1536                 /* Now has long enough transpired to autoclose? */
1537                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1538                 if ((ticks_gone_by > 0) &&
1539                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1540                         /*
1541                          * autoclose time has hit, call the output routine,
1542                          * which should do nothing just to be SURE we don't
1543                          * have hanging data. We can then safely check the
1544                          * queues and know that we are clear to send
1545                          * shutdown
1546                          */
1547                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1548                         /* Are we clean? */
1549                         if (TAILQ_EMPTY(&asoc->send_queue) &&
1550                             TAILQ_EMPTY(&asoc->sent_queue)) {
1551                                 /*
1552                                  * there is nothing queued to send, so I'm
1553                                  * done...
1554                                  */
1555                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1556                                         /* only send SHUTDOWN 1st time thru */
1557                                         struct sctp_nets *netp;
1558
1559                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1560                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1561                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1562                                         }
1563                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1564                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1565                                         sctp_stop_timers_for_shutdown(stcb);
1566                                         if (stcb->asoc.alternate) {
1567                                                 netp = stcb->asoc.alternate;
1568                                         } else {
1569                                                 netp = stcb->asoc.primary_destination;
1570                                         }
1571                                         sctp_send_shutdown(stcb, netp);
1572                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1573                                             stcb->sctp_ep, stcb,
1574                                             netp);
1575                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1576                                             stcb->sctp_ep, stcb,
1577                                             netp);
1578                                 }
1579                         }
1580                 } else {
1581                         /*
1582                          * No auto close at this time, reset t-o to check
1583                          * later
1584                          */
1585                         int tmp;
1586
1587                         /* fool the timer startup to use the time left */
1588                         tmp = asoc->sctp_autoclose_ticks;
1589                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
1590                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1591                             net);
1592                         /* restore the real tick value */
1593                         asoc->sctp_autoclose_ticks = tmp;
1594                 }
1595         }
1596 }