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 #if defined(INET) || defined(INET6)
  53 #include <netinet/udp.h>
  54 #endif
  55
  56
  57 void
  58 sctp_audit_retranmission_queue(struct sctp_association *asoc)
  59 {
  60         struct sctp_tmit_chunk *chk;
  61
  62         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
  63             asoc->sent_queue_retran_cnt,
  64             asoc->sent_queue_cnt);
  65         asoc->sent_queue_retran_cnt = 0;
  66         asoc->sent_queue_cnt = 0;
  67         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  68                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  69                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  70                 }
  71                 asoc->sent_queue_cnt++;
  72         }
  73         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
  74                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  75                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  76                 }
  77         }
  78         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
  79                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  80                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  81                 }
  82         }
  83         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
  84             asoc->sent_queue_retran_cnt,
  85             asoc->sent_queue_cnt);
  86 }
  87
  88 static int
  89 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  90     struct sctp_nets *net, uint16_t threshold)
  91 {
  92         if (net) {
  93                 net->error_count++;
  94                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
  95                     (void *)net, net->error_count,
  96                     net->failure_threshold);
  97                 if (net->error_count > net->failure_threshold) {
  98                         /* We had a threshold failure */
  99                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 100                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 101                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 102                                 net->dest_state &= ~SCTP_ADDR_PF;
 103                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 104                                     stcb, 0,
 105                                     (void *)net, SCTP_SO_NOT_LOCKED);
 106                         }
 107                 } else if ((net->pf_threshold < net->failure_threshold) &&
 108                     (net->error_count > net->pf_threshold)) {
 109                         if (!(net->dest_state & SCTP_ADDR_PF)) {
 110                                 net->dest_state |= SCTP_ADDR_PF;
 111                                 net->last_active = sctp_get_tick_count();
 112                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 113                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
 114                                     inp, stcb, net,
 115                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
 116                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
 117                         }
 118                 }
 119         }
 120         if (stcb == NULL)
 121                 return (0);
 122
 123         if (net) {
 124                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
 125                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 126                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
 127                                     stcb->asoc.overall_error_count,
 128                                     (stcb->asoc.overall_error_count + 1),
 129                                     SCTP_FROM_SCTP_TIMER,
 130                                     __LINE__);
 131                         }
 132                         stcb->asoc.overall_error_count++;
 133                 }
 134         } else {
 135                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 136                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
 137                             stcb->asoc.overall_error_count,
 138                             (stcb->asoc.overall_error_count + 1),
 139                             SCTP_FROM_SCTP_TIMER,
 140                             __LINE__);
 141                 }
 142                 stcb->asoc.overall_error_count++;
 143         }
 144         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
 145             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
 146             (uint32_t) threshold,
 147             ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
 148         /*
 149          * We specifically do not do >= to give the assoc one more change
 150          * before we fail it.
 151          */
 152         if (stcb->asoc.overall_error_count > threshold) {
 153                 /* Abort notification sends a ULP notify */
 154                 struct mbuf *op_err;
 155
 156                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 157                     "Association error counter exceeded");
 158                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
 159                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 160                 return (1);
 161         }
 162         return (0);
 163 }
 164
 165 /*
 166  * sctp_find_alternate_net() returns a non-NULL pointer as long
 167  * the argument net is non-NULL.
 168  */
 169 struct sctp_nets *
 170 sctp_find_alternate_net(struct sctp_tcb *stcb,
 171     struct sctp_nets *net,
 172     int mode)
 173 {
 174         /* Find and return an alternate network if possible */
 175         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
 176         int once;
 177
 178         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
 179         int min_errors = -1;
 180         uint32_t max_cwnd = 0;
 181
 182         if (stcb->asoc.numnets == 1) {
 183                 /* No others but net */
 184                 return (TAILQ_FIRST(&stcb->asoc.nets));
 185         }
 186         /*
 187          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
 188          * net algorithm. This algorithm chooses the active destination (not
 189          * in PF state) with the largest cwnd value. If all destinations are
 190          * in PF state, unreachable, or unconfirmed, choose the desination
 191          * that is in PF state with the lowest error count. In case of a
 192          * tie, choose the destination that was most recently active.
 193          */
 194         if (mode == 2) {
 195                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 196                         /* JRS 5/14/07 - If the destination is unreachable
 197                          * or unconfirmed, skip it. */
 198                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 199                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 200                                 continue;
 201                         }
 202                         /*
 203                          * JRS 5/14/07 -  If the destination is reachable
 204                          * but in PF state, compare the error count of the
 205                          * destination to the minimum error count seen thus
 206                          * far. Store the destination with the lower error
 207                          * count.  If the error counts are equal, store the
 208                          * destination that was most recently active.
 209                          */
 210                         if (mnet->dest_state & SCTP_ADDR_PF) {
 211                                 /*
 212                                  * JRS 5/14/07 - If the destination under
 213                                  * consideration is the current destination,
 214                                  * work as if the error count is one higher.
 215                                  * The actual error count will not be
 216                                  * incremented until later in the t3
 217                                  * handler.
 218                                  */
 219                                 if (mnet == net) {
 220                                         if (min_errors == -1) {
 221                                                 min_errors = mnet->error_count + 1;
 222                                                 min_errors_net = mnet;
 223                                         } else if (mnet->error_count + 1 < min_errors) {
 224                                                 min_errors = mnet->error_count + 1;
 225                                                 min_errors_net = mnet;
 226                                         } else if (mnet->error_count + 1 == min_errors
 227                                             && mnet->last_active > min_errors_net->last_active) {
 228                                                 min_errors_net = mnet;
 229                                                 min_errors = mnet->error_count + 1;
 230                                         }
 231                                         continue;
 232                                 } else {
 233                                         if (min_errors == -1) {
 234                                                 min_errors = mnet->error_count;
 235                                                 min_errors_net = mnet;
 236                                         } else if (mnet->error_count < min_errors) {
 237                                                 min_errors = mnet->error_count;
 238                                                 min_errors_net = mnet;
 239                                         } else if (mnet->error_count == min_errors
 240                                             && mnet->last_active > min_errors_net->last_active) {
 241                                                 min_errors_net = mnet;
 242                                                 min_errors = mnet->error_count;
 243                                         }
 244                                         continue;
 245                                 }
 246                         }
 247                         /*
 248                          * JRS 5/14/07 - If the destination is reachable and
 249                          * not in PF state, compare the cwnd of the
 250                          * destination to the highest cwnd seen thus far.
 251                          * Store the destination with the higher cwnd value.
 252                          * If the cwnd values are equal, randomly choose one
 253                          * of the two destinations.
 254                          */
 255                         if (max_cwnd < mnet->cwnd) {
 256                                 max_cwnd_net = mnet;
 257                                 max_cwnd = mnet->cwnd;
 258                         } else if (max_cwnd == mnet->cwnd) {
 259                                 uint32_t rndval;
 260                                 uint8_t this_random;
 261
 262                                 if (stcb->asoc.hb_random_idx > 3) {
 263                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 264                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
 265                                         this_random = stcb->asoc.hb_random_values[0];
 266                                         stcb->asoc.hb_random_idx++;
 267                                         stcb->asoc.hb_ect_randombit = 0;
 268                                 } else {
 269                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 270                                         stcb->asoc.hb_random_idx++;
 271                                         stcb->asoc.hb_ect_randombit = 0;
 272                                 }
 273                                 if (this_random % 2 == 1) {
 274                                         max_cwnd_net = mnet;
 275                                         max_cwnd = mnet->cwnd;  /* Useless? */
 276                                 }
 277                         }
 278                 }
 279                 if (max_cwnd_net == NULL) {
 280                         if (min_errors_net == NULL) {
 281                                 return (net);
 282                         }
 283                         return (min_errors_net);
 284                 } else {
 285                         return (max_cwnd_net);
 286                 }
 287         }                       /* JRS 5/14/07 - If mode is set to 1, use the
 288           * CMT policy for choosing an alternate net. */
 289         else if (mode == 1) {
 290                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 291                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 292                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 293                                 /*
 294                                  * will skip ones that are not-reachable or
 295                                  * unconfirmed
 296                                  */
 297                                 continue;
 298                         }
 299                         if (max_cwnd < mnet->cwnd) {
 300                                 max_cwnd_net = mnet;
 301                                 max_cwnd = mnet->cwnd;
 302                         } else if (max_cwnd == mnet->cwnd) {
 303                                 uint32_t rndval;
 304                                 uint8_t this_random;
 305
 306                                 if (stcb->asoc.hb_random_idx > 3) {
 307                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 308                                         memcpy(stcb->asoc.hb_random_values, &rndval,
 309                                             sizeof(stcb->asoc.hb_random_values));
 310                                         this_random = stcb->asoc.hb_random_values[0];
 311                                         stcb->asoc.hb_random_idx = 0;
 312                                         stcb->asoc.hb_ect_randombit = 0;
 313                                 } else {
 314                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 315                                         stcb->asoc.hb_random_idx++;
 316                                         stcb->asoc.hb_ect_randombit = 0;
 317                                 }
 318                                 if (this_random % 2) {
 319                                         max_cwnd_net = mnet;
 320                                         max_cwnd = mnet->cwnd;
 321                                 }
 322                         }
 323                 }
 324                 if (max_cwnd_net) {
 325                         return (max_cwnd_net);
 326                 }
 327         }
 328         mnet = net;
 329         once = 0;
 330
 331         if (mnet == NULL) {
 332                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
 333                 if (mnet == NULL) {
 334                         return (NULL);
 335                 }
 336         }
 337         for (;;) {
 338                 alt = TAILQ_NEXT(mnet, sctp_next);
 339                 if (alt == NULL) {
 340                         once++;
 341                         if (once > 1) {
 342                                 break;
 343                         }
 344                         alt = TAILQ_FIRST(&stcb->asoc.nets);
 345                         if (alt == NULL) {
 346                                 return (NULL);
 347                         }
 348                 }
 349                 if (alt->ro.ro_rt == NULL) {
 350                         if (alt->ro._s_addr) {
 351                                 sctp_free_ifa(alt->ro._s_addr);
 352                                 alt->ro._s_addr = NULL;
 353                         }
 354                         alt->src_addr_selected = 0;
 355                 }
 356                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
 357                     (alt->ro.ro_rt != NULL) &&
 358                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 359                         /* Found a reachable address */
 360                         break;
 361                 }
 362                 mnet = alt;
 363         }
 364
 365         if (alt == NULL) {
 366                 /* Case where NO insv network exists (dormant state) */
 367                 /* we rotate destinations */
 368                 once = 0;
 369                 mnet = net;
 370                 for (;;) {
 371                         if (mnet == NULL) {
 372                                 return (TAILQ_FIRST(&stcb->asoc.nets));
 373                         }
 374                         alt = TAILQ_NEXT(mnet, sctp_next);
 375                         if (alt == NULL) {
 376                                 once++;
 377                                 if (once > 1) {
 378                                         break;
 379                                 }
 380                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
 381                                 if (alt == NULL) {
 382                                         break;
 383                                 }
 384                         }
 385                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 386                             (alt != net)) {
 387                                 /* Found an alternate address */
 388                                 break;
 389                         }
 390                         mnet = alt;
 391                 }
 392         }
 393         if (alt == NULL) {
 394                 return (net);
 395         }
 396         return (alt);
 397 }
 398
 399 static void
 400 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
 401     struct sctp_nets *net,
 402     int win_probe,
 403     int num_marked, int num_abandoned)
 404 {
 405         if (net->RTO == 0) {
 406                 if (net->RTO_measured) {
 407                         net->RTO = stcb->asoc.minrto;
 408                 } else {
 409                         net->RTO = stcb->asoc.initial_rto;
 410                 }
 411         }
 412         net->RTO <<= 1;
 413         if (net->RTO > stcb->asoc.maxrto) {
 414                 net->RTO = stcb->asoc.maxrto;
 415         }
 416         if ((win_probe == 0) && (num_marked || num_abandoned)) {
 417                 /* We don't apply penalty to window probe scenarios */
 418                 /* JRS - Use the congestion control given in the CC module */
 419                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
 420         }
 421 }
 422
 423 #ifndef INVARIANTS
 424 static void
 425 sctp_recover_sent_list(struct sctp_tcb *stcb)
 426 {
 427         struct sctp_tmit_chunk *chk, *nchk;
 428         struct sctp_association *asoc;
 429
 430         asoc = &stcb->asoc;
 431         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
 432                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
 433                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
 434                             (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
 435                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
 436                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 437                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 438                                 }
 439                         }
 440                         if ((asoc->strmout[chk->rec.data.stream_number].chunks_on_queues == 0) &&
 441                             (asoc->strmout[chk->rec.data.stream_number].state == SCTP_STREAM_RESET_PENDING) &&
 442                             TAILQ_EMPTY(&asoc->strmout[chk->rec.data.stream_number].outqueue)) {
 443                                 asoc->trigger_reset = 1;
 444                         }
 445                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 446                         if (PR_SCTP_ENABLED(chk->flags)) {
 447                                 if (asoc->pr_sctp_cnt != 0)
 448                                         asoc->pr_sctp_cnt--;
 449                         }
 450                         if (chk->data) {
 451                                 /* sa_ignore NO_NULL_CHK */
 452                                 sctp_free_bufspace(stcb, asoc, chk, 1);
 453                                 sctp_m_freem(chk->data);
 454                                 chk->data = NULL;
 455                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
 456                                         asoc->sent_queue_cnt_removeable--;
 457                                 }
 458                         }
 459                         asoc->sent_queue_cnt--;
 460                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 461                 }
 462         }
 463         SCTP_PRINTF("after recover order is as follows\n");
 464         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 465                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
 466         }
 467 }
 468 #endif
 469
 470 static int
 471 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
 472     struct sctp_nets *net,
 473     struct sctp_nets *alt,
 474     int window_probe,
 475     int *num_marked,
 476     int *num_abandoned)
 477 {
 478
 479         /*
 480          * Mark all chunks (well not all) that were sent to *net for
 481          * retransmission. Move them to alt for there destination as well...
 482          * We only mark chunks that have been outstanding long enough to
 483          * have received feed-back.
 484          */
 485         struct sctp_tmit_chunk *chk, *nchk;
 486         struct sctp_nets *lnets;
 487         struct timeval now, min_wait, tv;
 488         int cur_rto;
 489         int cnt_abandoned;
 490         int audit_tf, num_mk, fir;
 491         unsigned int cnt_mk;
 492         uint32_t orig_flight, orig_tf;
 493         uint32_t tsnlast, tsnfirst;
 494         int recovery_cnt = 0;
 495
 496
 497         /* none in flight now */
 498         audit_tf = 0;
 499         fir = 0;
 500         /*
 501          * figure out how long a data chunk must be pending before we can
 502          * mark it ..
 503          */
 504         (void)SCTP_GETTIME_TIMEVAL(&now);
 505         /* get cur rto in micro-seconds */
 506         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
 507         cur_rto *= 1000;
 508         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 509                 sctp_log_fr(cur_rto,
 510                     stcb->asoc.peers_rwnd,
 511                     window_probe,
 512                     SCTP_FR_T3_MARK_TIME);
 513                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
 514                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
 515         }
 516         tv.tv_sec = cur_rto / 1000000;
 517         tv.tv_usec = cur_rto % 1000000;
 518         min_wait = now;
 519         timevalsub(&min_wait, &tv);
 520         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
 521                 /*
 522                  * if we hit here, we don't have enough seconds on the clock
 523                  * to account for the RTO. We just let the lower seconds be
 524                  * the bounds and don't worry about it. This may mean we
 525                  * will mark a lot more than we should.
 526                  */
 527                 min_wait.tv_sec = min_wait.tv_usec = 0;
 528         }
 529         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 530                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
 531                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
 532         }
 533         /*
 534          * Our rwnd will be incorrect here since we are not adding back the
 535          * cnt * mbuf but we will fix that down below.
 536          */
 537         orig_flight = net->flight_size;
 538         orig_tf = stcb->asoc.total_flight;
 539
 540         net->fast_retran_ip = 0;
 541         /* Now on to each chunk */
 542         cnt_abandoned = 0;
 543         num_mk = cnt_mk = 0;
 544         tsnfirst = tsnlast = 0;
 545 #ifndef INVARIANTS
 546 start_again:
 547 #endif
 548         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
 549                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
 550                         /* Strange case our list got out of order? */
 551                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
 552                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
 553                         recovery_cnt++;
 554 #ifdef INVARIANTS
 555                         panic("last acked >= chk on sent-Q");
 556 #else
 557                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
 558                         sctp_recover_sent_list(stcb);
 559                         if (recovery_cnt < 10) {
 560                                 goto start_again;
 561                         } else {
 562                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
 563                         }
 564 #endif
 565                 }
 566                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
 567                         /*
 568                          * found one to mark: If it is less than
 569                          * DATAGRAM_ACKED it MUST not be a skipped or marked
 570                          * TSN but instead one that is either already set
 571                          * for retransmission OR one that needs
 572                          * retransmission.
 573                          */
 574
 575                         /* validate its been outstanding long enough */
 576                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 577                                 sctp_log_fr(chk->rec.data.TSN_seq,
 578                                     chk->sent_rcv_time.tv_sec,
 579                                     chk->sent_rcv_time.tv_usec,
 580                                     SCTP_FR_T3_MARK_TIME);
 581                         }
 582                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
 583                                 /*
 584                                  * we have reached a chunk that was sent
 585                                  * some seconds past our min.. forget it we
 586                                  * will find no more to send.
 587                                  */
 588                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 589                                         sctp_log_fr(0,
 590                                             chk->sent_rcv_time.tv_sec,
 591                                             chk->sent_rcv_time.tv_usec,
 592                                             SCTP_FR_T3_STOPPED);
 593                                 }
 594                                 continue;
 595                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
 596                             (window_probe == 0)) {
 597                                 /*
 598                                  * we must look at the micro seconds to
 599                                  * know.
 600                                  */
 601                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
 602                                         /*
 603                                          * ok it was sent after our boundary
 604                                          * time.
 605                                          */
 606                                         continue;
 607                                 }
 608                         }
 609                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
 610                                 /* Is it expired? */
 611                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
 612                                         /* Yes so drop it */
 613                                         if (chk->data) {
 614                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 615                                                     chk,
 616                                                     1,
 617                                                     SCTP_SO_NOT_LOCKED);
 618                                                 cnt_abandoned++;
 619                                         }
 620                                         continue;
 621                                 }
 622                         }
 623                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
 624                                 /* Has it been retransmitted tv_sec times? */
 625                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
 626                                         if (chk->data) {
 627                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 628                                                     chk,
 629                                                     1,
 630                                                     SCTP_SO_NOT_LOCKED);
 631                                                 cnt_abandoned++;
 632                                         }
 633                                         continue;
 634                                 }
 635                         }
 636                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 637                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 638                                 num_mk++;
 639                                 if (fir == 0) {
 640                                         fir = 1;
 641                                         tsnfirst = chk->rec.data.TSN_seq;
 642                                 }
 643                                 tsnlast = chk->rec.data.TSN_seq;
 644                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 645                                         sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
 646                                             0, SCTP_FR_T3_MARKED);
 647                                 }
 648                                 if (chk->rec.data.chunk_was_revoked) {
 649                                         /* deflate the cwnd */
 650                                         chk->whoTo->cwnd -= chk->book_size;
 651                                         chk->rec.data.chunk_was_revoked = 0;
 652                                 }
 653                                 net->marked_retrans++;
 654                                 stcb->asoc.marked_retrans++;
 655                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 656                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
 657                                             chk->whoTo->flight_size,
 658                                             chk->book_size,
 659                                             (uint32_t) (uintptr_t) chk->whoTo,
 660                                             chk->rec.data.TSN_seq);
 661                                 }
 662                                 sctp_flight_size_decrease(chk);
 663                                 sctp_total_flight_decrease(stcb, chk);
 664                                 stcb->asoc.peers_rwnd += chk->send_size;
 665                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
 666                         }
 667                         chk->sent = SCTP_DATAGRAM_RESEND;
 668                         SCTP_STAT_INCR(sctps_markedretrans);
 669
 670                         /* reset the TSN for striking and other FR stuff */
 671                         chk->rec.data.doing_fast_retransmit = 0;
 672                         /* Clear any time so NO RTT is being done */
 673
 674                         if (chk->do_rtt) {
 675                                 if (chk->whoTo->rto_needed == 0) {
 676                                         chk->whoTo->rto_needed = 1;
 677                                 }
 678                         }
 679                         chk->do_rtt = 0;
 680                         if (alt != net) {
 681                                 sctp_free_remote_addr(chk->whoTo);
 682                                 chk->no_fr_allowed = 1;
 683                                 chk->whoTo = alt;
 684                                 atomic_add_int(&alt->ref_count, 1);
 685                         } else {
 686                                 chk->no_fr_allowed = 0;
 687                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 688                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 689                                 } else {
 690                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
 691                                 }
 692                         }
 693                         /*
 694                          * CMT: Do not allow FRs on retransmitted TSNs.
 695                          */
 696                         if (stcb->asoc.sctp_cmt_on_off > 0) {
 697                                 chk->no_fr_allowed = 1;
 698                         }
 699 #ifdef THIS_SHOULD_NOT_BE_DONE
 700                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
 701                         /* remember highest acked one */
 702                         could_be_sent = chk;
 703 #endif
 704                 }
 705                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 706                         cnt_mk++;
 707                 }
 708         }
 709         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
 710                 /* we did not subtract the same things? */
 711                 audit_tf = 1;
 712         }
 713         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 714                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
 715         }
 716 #ifdef SCTP_DEBUG
 717         if (num_mk) {
 718                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 719                     tsnlast);
 720                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
 721                     num_mk, (u_long)stcb->asoc.peers_rwnd);
 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:%d\n",
 725                     num_mk,
 726                     (int)stcb->asoc.peers_rwnd);
 727         }
 728 #endif
 729         *num_marked = num_mk;
 730         *num_abandoned = cnt_abandoned;
 731         /*
 732          * Now check for a ECN Echo that may be stranded And include the
 733          * cnt_mk'd to have all resends in the control queue.
 734          */
 735         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 736                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 737                         cnt_mk++;
 738                 }
 739                 if ((chk->whoTo == net) &&
 740                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 741                         sctp_free_remote_addr(chk->whoTo);
 742                         chk->whoTo = alt;
 743                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 744                                 chk->sent = SCTP_DATAGRAM_RESEND;
 745                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 746                                 cnt_mk++;
 747                         }
 748                         atomic_add_int(&alt->ref_count, 1);
 749                 }
 750         }
 751 #ifdef THIS_SHOULD_NOT_BE_DONE
 752         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
 753                 /* fix it so we retransmit the highest acked anyway */
 754                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 755                 cnt_mk++;
 756                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
 757         }
 758 #endif
 759         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
 760 #ifdef INVARIANTS
 761                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
 762                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
 763 #endif
 764 #ifndef SCTP_AUDITING_ENABLED
 765                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
 766 #endif
 767         }
 768         if (audit_tf) {
 769                 SCTPDBG(SCTP_DEBUG_TIMER4,
 770                     "Audit total flight due to negative value net:%p\n",
 771                     (void *)net);
 772                 stcb->asoc.total_flight = 0;
 773                 stcb->asoc.total_flight_count = 0;
 774                 /* Clear all networks flight size */
 775                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
 776                         lnets->flight_size = 0;
 777                         SCTPDBG(SCTP_DEBUG_TIMER4,
 778                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
 779                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
 780                 }
 781                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 782                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 783                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 784                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 785                                             chk->whoTo->flight_size,
 786                                             chk->book_size,
 787                                             (uint32_t) (uintptr_t) chk->whoTo,
 788                                             chk->rec.data.TSN_seq);
 789                                 }
 790                                 sctp_flight_size_increase(chk);
 791                                 sctp_total_flight_increase(stcb, chk);
 792                         }
 793                 }
 794         }
 795         /* We return 1 if we only have a window probe outstanding */
 796         return (0);
 797 }
 798
 799
 800 int
 801 sctp_t3rxt_timer(struct sctp_inpcb *inp,
 802     struct sctp_tcb *stcb,
 803     struct sctp_nets *net)
 804 {
 805         struct sctp_nets *alt;
 806         int win_probe, num_mk, num_abandoned;
 807
 808         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 809                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
 810         }
 811         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 812                 struct sctp_nets *lnet;
 813
 814                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
 815                         if (net == lnet) {
 816                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
 817                         } else {
 818                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
 819                         }
 820                 }
 821         }
 822         /* Find an alternate and mark those for retransmission */
 823         if ((stcb->asoc.peers_rwnd == 0) &&
 824             (stcb->asoc.total_flight < net->mtu)) {
 825                 SCTP_STAT_INCR(sctps_timowindowprobe);
 826                 win_probe = 1;
 827         } else {
 828                 win_probe = 0;
 829         }
 830
 831         if (win_probe == 0) {
 832                 /* We don't do normal threshold management on window probes */
 833                 if (sctp_threshold_management(inp, stcb, net,
 834                     stcb->asoc.max_send_times)) {
 835                         /* Association was destroyed */
 836                         return (1);
 837                 } else {
 838                         if (net != stcb->asoc.primary_destination) {
 839                                 /* send a immediate HB if our RTO is stale */
 840                                 struct timeval now;
 841                                 unsigned int ms_goneby;
 842
 843                                 (void)SCTP_GETTIME_TIMEVAL(&now);
 844                                 if (net->last_sent_time.tv_sec) {
 845                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
 846                                 } else {
 847                                         ms_goneby = 0;
 848                                 }
 849                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
 850                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
 851                                                 /*
 852                                                  * no recent feed back in an
 853                                                  * RTO or more, request a
 854                                                  * RTT update
 855                                                  */
 856                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 857                                         }
 858                                 }
 859                         }
 860                 }
 861         } else {
 862                 /*
 863                  * For a window probe we don't penalize the net's but only
 864                  * the association. This may fail it if SACKs are not coming
 865                  * back. If sack's are coming with rwnd locked at 0, we will
 866                  * continue to hold things waiting for rwnd to raise
 867                  */
 868                 if (sctp_threshold_management(inp, stcb, NULL,
 869                     stcb->asoc.max_send_times)) {
 870                         /* Association was destroyed */
 871                         return (1);
 872                 }
 873         }
 874         if (stcb->asoc.sctp_cmt_on_off > 0) {
 875                 if (net->pf_threshold < net->failure_threshold) {
 876                         alt = sctp_find_alternate_net(stcb, net, 2);
 877                 } else {
 878                         /*
 879                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
 880                          * being used, then pick dest with largest ssthresh
 881                          * for any retransmission.
 882                          */
 883                         alt = sctp_find_alternate_net(stcb, net, 1);
 884                         /*
 885                          * CUCv2: If a different dest is picked for the
 886                          * retransmission, then new (rtx-)pseudo_cumack
 887                          * needs to be tracked for orig dest. Let CUCv2
 888                          * track new (rtx-) pseudo-cumack always.
 889                          */
 890                         net->find_pseudo_cumack = 1;
 891                         net->find_rtx_pseudo_cumack = 1;
 892                 }
 893         } else {
 894                 alt = sctp_find_alternate_net(stcb, net, 0);
 895         }
 896
 897         num_mk = 0;
 898         num_abandoned = 0;
 899         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
 900             &num_mk, &num_abandoned);
 901         /* FR Loss recovery just ended with the T3. */
 902         stcb->asoc.fast_retran_loss_recovery = 0;
 903
 904         /* CMT FR loss recovery ended with the T3 */
 905         net->fast_retran_loss_recovery = 0;
 906         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 907             (net->flight_size == 0)) {
 908                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 909         }
 910         /*
 911          * setup the sat loss recovery that prevents satellite cwnd advance.
 912          */
 913         stcb->asoc.sat_t3_loss_recovery = 1;
 914         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
 915
 916         /* Backoff the timer and cwnd */
 917         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
 918         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 919             (net->dest_state & SCTP_ADDR_PF)) {
 920                 /* Move all pending over too */
 921                 sctp_move_chunks_from_net(stcb, net);
 922
 923                 /*
 924                  * Get the address that failed, to force a new src address
 925                  * selecton and a route allocation.
 926                  */
 927                 if (net->ro._s_addr) {
 928                         sctp_free_ifa(net->ro._s_addr);
 929                         net->ro._s_addr = NULL;
 930                 }
 931                 net->src_addr_selected = 0;
 932
 933                 /* Force a route allocation too */
 934                 if (net->ro.ro_rt) {
 935                         RTFREE(net->ro.ro_rt);
 936                         net->ro.ro_rt = NULL;
 937                 }
 938                 /* Was it our primary? */
 939                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
 940                         /*
 941                          * Yes, note it as such and find an alternate note:
 942                          * this means HB code must use this to resent the
 943                          * primary if it goes active AND if someone does a
 944                          * change-primary then this flag must be cleared
 945                          * from any net structures.
 946                          */
 947                         if (stcb->asoc.alternate) {
 948                                 sctp_free_remote_addr(stcb->asoc.alternate);
 949                         }
 950                         stcb->asoc.alternate = alt;
 951                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 952                 }
 953         }
 954         /*
 955          * Special case for cookie-echo'ed case, we don't do output but must
 956          * await the COOKIE-ACK before retransmission
 957          */
 958         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 959                 /*
 960                  * Here we just reset the timer and start again since we
 961                  * have not established the asoc
 962                  */
 963                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 964                 return (0);
 965         }
 966         if (stcb->asoc.prsctp_supported) {
 967                 struct sctp_tmit_chunk *lchk;
 968
 969                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
 970                 /* C3. See if we need to send a Fwd-TSN */
 971                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
 972                         send_forward_tsn(stcb, &stcb->asoc);
 973                         if (lchk) {
 974                                 /* Assure a timer is up */
 975                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
 976                         }
 977                 }
 978         }
 979         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
 980                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
 981         }
 982         return (0);
 983 }
 984
 985 int
 986 sctp_t1init_timer(struct sctp_inpcb *inp,
 987     struct sctp_tcb *stcb,
 988     struct sctp_nets *net)
 989 {
 990         /* bump the thresholds */
 991         if (stcb->asoc.delayed_connection) {
 992                 /*
 993                  * special hook for delayed connection. The library did NOT
 994                  * complete the rest of its sends.
 995                  */
 996                 stcb->asoc.delayed_connection = 0;
 997                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 998                 return (0);
 999         }
1000         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
1001                 return (0);
1002         }
1003         if (sctp_threshold_management(inp, stcb, net,
1004             stcb->asoc.max_init_times)) {
1005                 /* Association was destroyed */
1006                 return (1);
1007         }
1008         stcb->asoc.dropped_special_cnt = 0;
1009         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1010         if (stcb->asoc.initial_init_rto_max < net->RTO) {
1011                 net->RTO = stcb->asoc.initial_init_rto_max;
1012         }
1013         if (stcb->asoc.numnets > 1) {
1014                 /* If we have more than one addr use it */
1015                 struct sctp_nets *alt;
1016
1017                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1018                 if (alt != stcb->asoc.primary_destination) {
1019                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1020                         stcb->asoc.primary_destination = alt;
1021                 }
1022         }
1023         /* Send out a new init */
1024         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1025         return (0);
1026 }
1027
1028 /*
1029  * For cookie and asconf we actually need to find and mark for resend, then
1030  * increment the resend counter (after all the threshold management stuff of
1031  * course).
1032  */
1033 int
1034 sctp_cookie_timer(struct sctp_inpcb *inp,
1035     struct sctp_tcb *stcb,
1036     struct sctp_nets *net SCTP_UNUSED)
1037 {
1038         struct sctp_nets *alt;
1039         struct sctp_tmit_chunk *cookie;
1040
1041         /* first before all else we must find the cookie */
1042         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1043                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1044                         break;
1045                 }
1046         }
1047         if (cookie == NULL) {
1048                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1049                         /* FOOBAR! */
1050                         struct mbuf *op_err;
1051
1052                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1053                             "Cookie timer expired, but no cookie");
1054                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
1055                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1056                 } else {
1057 #ifdef INVARIANTS
1058                         panic("Cookie timer expires in wrong state?");
1059 #else
1060                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1061                         return (0);
1062 #endif
1063                 }
1064                 return (0);
1065         }
1066         /* Ok we found the cookie, threshold management next */
1067         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1068             stcb->asoc.max_init_times)) {
1069                 /* Assoc is over */
1070                 return (1);
1071         }
1072         /*
1073          * Cleared threshold management, now lets backoff the address and
1074          * select an alternate
1075          */
1076         stcb->asoc.dropped_special_cnt = 0;
1077         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1078         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1079         if (alt != cookie->whoTo) {
1080                 sctp_free_remote_addr(cookie->whoTo);
1081                 cookie->whoTo = alt;
1082                 atomic_add_int(&alt->ref_count, 1);
1083         }
1084         /* Now mark the retran info */
1085         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1086                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1087         }
1088         cookie->sent = SCTP_DATAGRAM_RESEND;
1089         /*
1090          * Now call the output routine to kick out the cookie again, Note we
1091          * don't mark any chunks for retran so that FR will need to kick in
1092          * to move these (or a send timer).
1093          */
1094         return (0);
1095 }
1096
1097 int
1098 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1099     struct sctp_nets *net)
1100 {
1101         struct sctp_nets *alt;
1102         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1103
1104         if (stcb->asoc.stream_reset_outstanding == 0) {
1105                 return (0);
1106         }
1107         /* find the existing STRRESET, we use the seq number we sent out on */
1108         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1109         if (strrst == NULL) {
1110                 return (0);
1111         }
1112         /* do threshold management */
1113         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1114             stcb->asoc.max_send_times)) {
1115                 /* Assoc is over */
1116                 return (1);
1117         }
1118         /*
1119          * Cleared threshold management, now lets backoff the address and
1120          * select an alternate
1121          */
1122         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1123         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1124         sctp_free_remote_addr(strrst->whoTo);
1125         strrst->whoTo = alt;
1126         atomic_add_int(&alt->ref_count, 1);
1127
1128         /* See if a ECN Echo is also stranded */
1129         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1130                 if ((chk->whoTo == net) &&
1131                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1132                         sctp_free_remote_addr(chk->whoTo);
1133                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
1134                                 chk->sent = SCTP_DATAGRAM_RESEND;
1135                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1136                         }
1137                         chk->whoTo = alt;
1138                         atomic_add_int(&alt->ref_count, 1);
1139                 }
1140         }
1141         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1142                 /*
1143                  * If the address went un-reachable, we need to move to
1144                  * alternates for ALL chk's in queue
1145                  */
1146                 sctp_move_chunks_from_net(stcb, net);
1147         }
1148         /* mark the retran info */
1149         if (strrst->sent != SCTP_DATAGRAM_RESEND)
1150                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1151         strrst->sent = SCTP_DATAGRAM_RESEND;
1152
1153         /* restart the timer */
1154         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1155         return (0);
1156 }
1157
1158 int
1159 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1160     struct sctp_nets *net)
1161 {
1162         struct sctp_nets *alt;
1163         struct sctp_tmit_chunk *asconf, *chk;
1164
1165         /* is this a first send, or a retransmission? */
1166         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1167                 /* compose a new ASCONF chunk and send it */
1168                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1169         } else {
1170                 /*
1171                  * Retransmission of the existing ASCONF is needed
1172                  */
1173
1174                 /* find the existing ASCONF */
1175                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1176                 if (asconf == NULL) {
1177                         return (0);
1178                 }
1179                 /* do threshold management */
1180                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1181                     stcb->asoc.max_send_times)) {
1182                         /* Assoc is over */
1183                         return (1);
1184                 }
1185                 if (asconf->snd_count > stcb->asoc.max_send_times) {
1186                         /*
1187                          * Something is rotten: our peer is not responding
1188                          * to ASCONFs but apparently is to other chunks.
1189                          * i.e. it is not properly handling the chunk type
1190                          * upper bits. Mark this peer as ASCONF incapable
1191                          * and cleanup.
1192                          */
1193                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1194                         sctp_asconf_cleanup(stcb, net);
1195                         return (0);
1196                 }
1197                 /*
1198                  * cleared threshold management, so now backoff the net and
1199                  * select an alternate
1200                  */
1201                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1202                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1203                 if (asconf->whoTo != alt) {
1204                         sctp_free_remote_addr(asconf->whoTo);
1205                         asconf->whoTo = alt;
1206                         atomic_add_int(&alt->ref_count, 1);
1207                 }
1208                 /* See if an ECN Echo is also stranded */
1209                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1210                         if ((chk->whoTo == net) &&
1211                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1212                                 sctp_free_remote_addr(chk->whoTo);
1213                                 chk->whoTo = alt;
1214                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1215                                         chk->sent = SCTP_DATAGRAM_RESEND;
1216                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1217                                 }
1218                                 atomic_add_int(&alt->ref_count, 1);
1219                         }
1220                 }
1221                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1222                         if (chk->whoTo != alt) {
1223                                 sctp_free_remote_addr(chk->whoTo);
1224                                 chk->whoTo = alt;
1225                                 atomic_add_int(&alt->ref_count, 1);
1226                         }
1227                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1228                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1229                         chk->sent = SCTP_DATAGRAM_RESEND;
1230                 }
1231                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1232                         /*
1233                          * If the address went un-reachable, we need to move
1234                          * to the alternate for ALL chunks in queue
1235                          */
1236                         sctp_move_chunks_from_net(stcb, net);
1237                 }
1238                 /* mark the retran info */
1239                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1240                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1241                 asconf->sent = SCTP_DATAGRAM_RESEND;
1242
1243                 /* send another ASCONF if any and we can do */
1244                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1245         }
1246         return (0);
1247 }
1248
1249 /* Mobility adaptation */
1250 void
1251 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1252     struct sctp_nets *net SCTP_UNUSED)
1253 {
1254         if (stcb->asoc.deleted_primary == NULL) {
1255                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1256                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1257                 return;
1258         }
1259         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1260         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1261         sctp_free_remote_addr(stcb->asoc.deleted_primary);
1262         stcb->asoc.deleted_primary = NULL;
1263         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1264         return;
1265 }
1266
1267 /*
1268  * For the shutdown and shutdown-ack, we do not keep one around on the
1269  * control queue. This means we must generate a new one and call the general
1270  * chunk output routine, AFTER having done threshold management.
1271  * It is assumed that net is non-NULL.
1272  */
1273 int
1274 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1275     struct sctp_nets *net)
1276 {
1277         struct sctp_nets *alt;
1278
1279         /* first threshold management */
1280         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1281                 /* Assoc is over */
1282                 return (1);
1283         }
1284         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1285         /* second select an alternative */
1286         alt = sctp_find_alternate_net(stcb, net, 0);
1287
1288         /* third generate a shutdown into the queue for out net */
1289         sctp_send_shutdown(stcb, alt);
1290
1291         /* fourth restart timer */
1292         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1293         return (0);
1294 }
1295
1296 int
1297 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1298     struct sctp_nets *net)
1299 {
1300         struct sctp_nets *alt;
1301
1302         /* first threshold management */
1303         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1304                 /* Assoc is over */
1305                 return (1);
1306         }
1307         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1308         /* second select an alternative */
1309         alt = sctp_find_alternate_net(stcb, net, 0);
1310
1311         /* third generate a shutdown into the queue for out net */
1312         sctp_send_shutdown_ack(stcb, alt);
1313
1314         /* fourth restart timer */
1315         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1316         return (0);
1317 }
1318
1319 static void
1320 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1321     struct sctp_tcb *stcb)
1322 {
1323         struct sctp_stream_queue_pending *sp;
1324         unsigned int i, chks_in_queue = 0;
1325         int being_filled = 0;
1326
1327         /*
1328          * This function is ONLY called when the send/sent queues are empty.
1329          */
1330         if ((stcb == NULL) || (inp == NULL))
1331                 return;
1332
1333         if (stcb->asoc.sent_queue_retran_cnt) {
1334                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1335                     stcb->asoc.sent_queue_retran_cnt);
1336                 stcb->asoc.sent_queue_retran_cnt = 0;
1337         }
1338         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1339                 /* No stream scheduler information, initialize scheduler */
1340                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1341                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1342                         /* yep, we lost a stream or two */
1343                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1344                 } else {
1345                         /* no streams lost */
1346                         stcb->asoc.total_output_queue_size = 0;
1347                 }
1348         }
1349         /* Check to see if some data queued, if so report it */
1350         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1351                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1352                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1353                                 if (sp->msg_is_complete)
1354                                         being_filled++;
1355                                 chks_in_queue++;
1356                         }
1357                 }
1358         }
1359         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1360                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1361                     stcb->asoc.stream_queue_cnt, chks_in_queue);
1362         }
1363         if (chks_in_queue) {
1364                 /* call the output queue function */
1365                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1366                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1367                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1368                         /*
1369                          * Probably should go in and make it go back through
1370                          * and add fragments allowed
1371                          */
1372                         if (being_filled == 0) {
1373                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1374                                     chks_in_queue);
1375                         }
1376                 }
1377         } else {
1378                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1379                     (u_long)stcb->asoc.total_output_queue_size);
1380                 stcb->asoc.total_output_queue_size = 0;
1381         }
1382 }
1383
1384 int
1385 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1386     struct sctp_nets *net)
1387 {
1388         uint8_t net_was_pf;
1389
1390         if (net->dest_state & SCTP_ADDR_PF) {
1391                 net_was_pf = 1;
1392         } else {
1393                 net_was_pf = 0;
1394         }
1395         if (net->hb_responded == 0) {
1396                 if (net->ro._s_addr) {
1397                         /*
1398                          * Invalidate the src address if we did not get a
1399                          * response last time.
1400                          */
1401                         sctp_free_ifa(net->ro._s_addr);
1402                         net->ro._s_addr = NULL;
1403                         net->src_addr_selected = 0;
1404                 }
1405                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1406                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1407                         /* Assoc is over */
1408                         return (1);
1409                 }
1410         }
1411         /* Zero PBA, if it needs it */
1412         if (net->partial_bytes_acked) {
1413                 net->partial_bytes_acked = 0;
1414         }
1415         if ((stcb->asoc.total_output_queue_size > 0) &&
1416             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1417             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1418                 sctp_audit_stream_queues_for_size(inp, stcb);
1419         }
1420         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1421             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1422                 /*
1423                  * when move to PF during threshold mangement, a HB has been
1424                  * queued in that routine
1425                  */
1426                 uint32_t ms_gone_by;
1427
1428                 if ((net->last_sent_time.tv_sec > 0) ||
1429                     (net->last_sent_time.tv_usec > 0)) {
1430                         struct timeval diff;
1431
1432                         SCTP_GETTIME_TIMEVAL(&diff);
1433                         timevalsub(&diff, &net->last_sent_time);
1434                         ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
1435                             (uint32_t) (diff.tv_usec / 1000);
1436                 } else {
1437                         ms_gone_by = 0xffffffff;
1438                 }
1439                 if ((ms_gone_by >= net->heart_beat_delay) ||
1440                     (net->dest_state & SCTP_ADDR_PF)) {
1441                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1442                 }
1443         }
1444         return (0);
1445 }
1446
1447 void
1448 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1449     struct sctp_tcb *stcb,
1450     struct sctp_nets *net)
1451 {
1452         uint32_t next_mtu, mtu;
1453
1454         next_mtu = sctp_get_next_mtu(net->mtu);
1455
1456         if ((next_mtu > net->mtu) && (net->port == 0)) {
1457                 if ((net->src_addr_selected == 0) ||
1458                     (net->ro._s_addr == NULL) ||
1459                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1460                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1461                                 sctp_free_ifa(net->ro._s_addr);
1462                                 net->ro._s_addr = NULL;
1463                                 net->src_addr_selected = 0;
1464                         } else if (net->ro._s_addr == NULL) {
1465 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1466                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1467                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1468
1469                                         /* KAME hack: embed scopeid */
1470                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1471                                 }
1472 #endif
1473
1474                                 net->ro._s_addr = sctp_source_address_selection(inp,
1475                                     stcb,
1476                                     (sctp_route_t *) & net->ro,
1477                                     net, 0, stcb->asoc.vrf_id);
1478 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1479                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1480                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1481
1482                                         (void)sa6_recoverscope(sin6);
1483                                 }
1484 #endif                          /* INET6 */
1485                         }
1486                         if (net->ro._s_addr)
1487                                 net->src_addr_selected = 1;
1488                 }
1489                 if (net->ro._s_addr) {
1490                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1491 #if defined(INET) || defined(INET6)
1492                         if (net->port) {
1493                                 mtu -= sizeof(struct udphdr);
1494                         }
1495 #endif
1496                         if (mtu > next_mtu) {
1497                                 net->mtu = next_mtu;
1498                         } else {
1499                                 net->mtu = mtu;
1500                         }
1501                 }
1502         }
1503         /* restart the timer */
1504         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1505 }
1506
1507 void
1508 sctp_autoclose_timer(struct sctp_inpcb *inp,
1509     struct sctp_tcb *stcb,
1510     struct sctp_nets *net)
1511 {
1512         struct timeval tn, *tim_touse;
1513         struct sctp_association *asoc;
1514         int ticks_gone_by;
1515
1516         (void)SCTP_GETTIME_TIMEVAL(&tn);
1517         if (stcb->asoc.sctp_autoclose_ticks &&
1518             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1519                 /* Auto close is on */
1520                 asoc = &stcb->asoc;
1521                 /* pick the time to use */
1522                 if (asoc->time_last_rcvd.tv_sec >
1523                     asoc->time_last_sent.tv_sec) {
1524                         tim_touse = &asoc->time_last_rcvd;
1525                 } else {
1526                         tim_touse = &asoc->time_last_sent;
1527                 }
1528                 /* Now has long enough transpired to autoclose? */
1529                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1530                 if ((ticks_gone_by > 0) &&
1531                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1532                         /*
1533                          * autoclose time has hit, call the output routine,
1534                          * which should do nothing just to be SURE we don't
1535                          * have hanging data. We can then safely check the
1536                          * queues and know that we are clear to send
1537                          * shutdown
1538                          */
1539                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1540                         /* Are we clean? */
1541                         if (TAILQ_EMPTY(&asoc->send_queue) &&
1542                             TAILQ_EMPTY(&asoc->sent_queue)) {
1543                                 /*
1544                                  * there is nothing queued to send, so I'm
1545                                  * done...
1546                                  */
1547                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1548                                         /* only send SHUTDOWN 1st time thru */
1549                                         struct sctp_nets *netp;
1550
1551                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1552                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1553                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1554                                         }
1555                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1556                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1557                                         sctp_stop_timers_for_shutdown(stcb);
1558                                         if (stcb->asoc.alternate) {
1559                                                 netp = stcb->asoc.alternate;
1560                                         } else {
1561                                                 netp = stcb->asoc.primary_destination;
1562                                         }
1563                                         sctp_send_shutdown(stcb, netp);
1564                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1565                                             stcb->sctp_ep, stcb,
1566                                             netp);
1567                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1568                                             stcb->sctp_ep, stcb,
1569                                             netp);
1570                                 }
1571                         }
1572                 } else {
1573                         /*
1574                          * No auto close at this time, reset t-o to check
1575                          * later
1576                          */
1577                         int tmp;
1578
1579                         /* fool the timer startup to use the time left */
1580                         tmp = asoc->sctp_autoclose_ticks;
1581                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
1582                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1583                             net);
1584                         /* restore the real tick value */
1585                         asoc->sctp_autoclose_ticks = tmp;
1586                 }
1587         }
1588 }