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 void
  59 sctp_audit_retranmission_queue(struct sctp_association *asoc)
  60 {
  61         struct sctp_tmit_chunk *chk;
  62
  63         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
  64             asoc->sent_queue_retran_cnt,
  65             asoc->sent_queue_cnt);
  66         asoc->sent_queue_retran_cnt = 0;
  67         asoc->sent_queue_cnt = 0;
  68         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  69                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  70                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  71                 }
  72                 asoc->sent_queue_cnt++;
  73         }
  74         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
  75                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  76                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  77                 }
  78         }
  79         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
  80                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  81                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  82                 }
  83         }
  84         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
  85             asoc->sent_queue_retran_cnt,
  86             asoc->sent_queue_cnt);
  87 }
  88
  89 static int
  90 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  91     struct sctp_nets *net, uint16_t threshold)
  92 {
  93         if (net) {
  94                 net->error_count++;
  95                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
  96                     (void *)net, net->error_count,
  97                     net->failure_threshold);
  98                 if (net->error_count > net->failure_threshold) {
  99                         /* We had a threshold failure */
 100                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 101                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 102                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 103                                 net->dest_state &= ~SCTP_ADDR_PF;
 104                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 105                                     stcb, 0,
 106                                     (void *)net, SCTP_SO_NOT_LOCKED);
 107                         }
 108                 } else if ((net->pf_threshold < net->failure_threshold) &&
 109                     (net->error_count > net->pf_threshold)) {
 110                         if (!(net->dest_state & SCTP_ADDR_PF)) {
 111                                 net->dest_state |= SCTP_ADDR_PF;
 112                                 net->last_active = sctp_get_tick_count();
 113                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 114                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
 115                                     inp, stcb, net,
 116                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
 117                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
 118                         }
 119                 }
 120         }
 121         if (stcb == NULL)
 122                 return (0);
 123
 124         if (net) {
 125                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
 126                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 127                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
 128                                     stcb->asoc.overall_error_count,
 129                                     (stcb->asoc.overall_error_count + 1),
 130                                     SCTP_FROM_SCTP_TIMER,
 131                                     __LINE__);
 132                         }
 133                         stcb->asoc.overall_error_count++;
 134                 }
 135         } else {
 136                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 137                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
 138                             stcb->asoc.overall_error_count,
 139                             (stcb->asoc.overall_error_count + 1),
 140                             SCTP_FROM_SCTP_TIMER,
 141                             __LINE__);
 142                 }
 143                 stcb->asoc.overall_error_count++;
 144         }
 145         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
 146             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
 147             (uint32_t)threshold,
 148             ((net == NULL) ? (uint32_t)0 : (uint32_t)net->dest_state));
 149         /*
 150          * We specifically do not do >= to give the assoc one more change
 151          * before we fail it.
 152          */
 153         if (stcb->asoc.overall_error_count > threshold) {
 154                 /* Abort notification sends a ULP notify */
 155                 struct mbuf *op_err;
 156
 157                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 158                     "Association error counter exceeded");
 159                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
 160                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 161                 return (1);
 162         }
 163         return (0);
 164 }
 165
 166 /*
 167  * sctp_find_alternate_net() returns a non-NULL pointer as long
 168  * the argument net is non-NULL.
 169  */
 170 struct sctp_nets *
 171 sctp_find_alternate_net(struct sctp_tcb *stcb,
 172     struct sctp_nets *net,
 173     int mode)
 174 {
 175         /* Find and return an alternate network if possible */
 176         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
 177         int once;
 178
 179         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
 180         int min_errors = -1;
 181         uint32_t max_cwnd = 0;
 182
 183         if (stcb->asoc.numnets == 1) {
 184                 /* No others but net */
 185                 return (TAILQ_FIRST(&stcb->asoc.nets));
 186         }
 187         /*
 188          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
 189          * net algorithm. This algorithm chooses the active destination (not
 190          * in PF state) with the largest cwnd value. If all destinations are
 191          * in PF state, unreachable, or unconfirmed, choose the desination
 192          * that is in PF state with the lowest error count. In case of a
 193          * tie, choose the destination that was most recently active.
 194          */
 195         if (mode == 2) {
 196                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 197                         /*
 198                          * JRS 5/14/07 - If the destination is unreachable
 199                          * or unconfirmed, skip it.
 200                          */
 201                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 202                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 203                                 continue;
 204                         }
 205                         /*
 206                          * JRS 5/14/07 -  If the destination is reachable
 207                          * but in PF state, compare the error count of the
 208                          * destination to the minimum error count seen thus
 209                          * far. Store the destination with the lower error
 210                          * count.  If the error counts are equal, store the
 211                          * destination that was most recently active.
 212                          */
 213                         if (mnet->dest_state & SCTP_ADDR_PF) {
 214                                 /*
 215                                  * JRS 5/14/07 - If the destination under
 216                                  * consideration is the current destination,
 217                                  * work as if the error count is one higher.
 218                                  * The actual error count will not be
 219                                  * incremented until later in the t3
 220                                  * handler.
 221                                  */
 222                                 if (mnet == net) {
 223                                         if (min_errors == -1) {
 224                                                 min_errors = mnet->error_count + 1;
 225                                                 min_errors_net = mnet;
 226                                         } else if (mnet->error_count + 1 < min_errors) {
 227                                                 min_errors = mnet->error_count + 1;
 228                                                 min_errors_net = mnet;
 229                                         } else if (mnet->error_count + 1 == min_errors
 230                                             && mnet->last_active > min_errors_net->last_active) {
 231                                                 min_errors_net = mnet;
 232                                                 min_errors = mnet->error_count + 1;
 233                                         }
 234                                         continue;
 235                                 } else {
 236                                         if (min_errors == -1) {
 237                                                 min_errors = mnet->error_count;
 238                                                 min_errors_net = mnet;
 239                                         } else if (mnet->error_count < min_errors) {
 240                                                 min_errors = mnet->error_count;
 241                                                 min_errors_net = mnet;
 242                                         } else if (mnet->error_count == min_errors
 243                                             && mnet->last_active > min_errors_net->last_active) {
 244                                                 min_errors_net = mnet;
 245                                                 min_errors = mnet->error_count;
 246                                         }
 247                                         continue;
 248                                 }
 249                         }
 250                         /*
 251                          * JRS 5/14/07 - If the destination is reachable and
 252                          * not in PF state, compare the cwnd of the
 253                          * destination to the highest cwnd seen thus far.
 254                          * Store the destination with the higher cwnd value.
 255                          * If the cwnd values are equal, randomly choose one
 256                          * of the two destinations.
 257                          */
 258                         if (max_cwnd < mnet->cwnd) {
 259                                 max_cwnd_net = mnet;
 260                                 max_cwnd = mnet->cwnd;
 261                         } else if (max_cwnd == mnet->cwnd) {
 262                                 uint32_t rndval;
 263                                 uint8_t this_random;
 264
 265                                 if (stcb->asoc.hb_random_idx > 3) {
 266                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 267                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
 268                                         this_random = stcb->asoc.hb_random_values[0];
 269                                         stcb->asoc.hb_random_idx++;
 270                                         stcb->asoc.hb_ect_randombit = 0;
 271                                 } else {
 272                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 273                                         stcb->asoc.hb_random_idx++;
 274                                         stcb->asoc.hb_ect_randombit = 0;
 275                                 }
 276                                 if (this_random % 2 == 1) {
 277                                         max_cwnd_net = mnet;
 278                                         max_cwnd = mnet->cwnd;  /* Useless? */
 279                                 }
 280                         }
 281                 }
 282                 if (max_cwnd_net == NULL) {
 283                         if (min_errors_net == NULL) {
 284                                 return (net);
 285                         }
 286                         return (min_errors_net);
 287                 } else {
 288                         return (max_cwnd_net);
 289                 }
 290         }                       /* JRS 5/14/07 - If mode is set to 1, use the
 291                                  * CMT policy for choosing an alternate net. */
 292         else if (mode == 1) {
 293                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 294                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 295                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 296                                 /*
 297                                  * will skip ones that are not-reachable or
 298                                  * unconfirmed
 299                                  */
 300                                 continue;
 301                         }
 302                         if (max_cwnd < mnet->cwnd) {
 303                                 max_cwnd_net = mnet;
 304                                 max_cwnd = mnet->cwnd;
 305                         } else if (max_cwnd == mnet->cwnd) {
 306                                 uint32_t rndval;
 307                                 uint8_t this_random;
 308
 309                                 if (stcb->asoc.hb_random_idx > 3) {
 310                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 311                                         memcpy(stcb->asoc.hb_random_values, &rndval,
 312                                             sizeof(stcb->asoc.hb_random_values));
 313                                         this_random = stcb->asoc.hb_random_values[0];
 314                                         stcb->asoc.hb_random_idx = 0;
 315                                         stcb->asoc.hb_ect_randombit = 0;
 316                                 } else {
 317                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 318                                         stcb->asoc.hb_random_idx++;
 319                                         stcb->asoc.hb_ect_randombit = 0;
 320                                 }
 321                                 if (this_random % 2) {
 322                                         max_cwnd_net = mnet;
 323                                         max_cwnd = mnet->cwnd;
 324                                 }
 325                         }
 326                 }
 327                 if (max_cwnd_net) {
 328                         return (max_cwnd_net);
 329                 }
 330         }
 331         mnet = net;
 332         once = 0;
 333
 334         if (mnet == NULL) {
 335                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
 336                 if (mnet == NULL) {
 337                         return (NULL);
 338                 }
 339         }
 340         for (;;) {
 341                 alt = TAILQ_NEXT(mnet, sctp_next);
 342                 if (alt == NULL) {
 343                         once++;
 344                         if (once > 1) {
 345                                 break;
 346                         }
 347                         alt = TAILQ_FIRST(&stcb->asoc.nets);
 348                         if (alt == NULL) {
 349                                 return (NULL);
 350                         }
 351                 }
 352                 if (alt->ro.ro_nh == NULL) {
 353                         if (alt->ro._s_addr) {
 354                                 sctp_free_ifa(alt->ro._s_addr);
 355                                 alt->ro._s_addr = NULL;
 356                         }
 357                         alt->src_addr_selected = 0;
 358                 }
 359                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
 360                     (alt->ro.ro_nh != NULL) &&
 361                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 362                         /* Found a reachable address */
 363                         break;
 364                 }
 365                 mnet = alt;
 366         }
 367
 368         if (alt == NULL) {
 369                 /* Case where NO insv network exists (dormant state) */
 370                 /* we rotate destinations */
 371                 once = 0;
 372                 mnet = net;
 373                 for (;;) {
 374                         if (mnet == NULL) {
 375                                 return (TAILQ_FIRST(&stcb->asoc.nets));
 376                         }
 377                         alt = TAILQ_NEXT(mnet, sctp_next);
 378                         if (alt == NULL) {
 379                                 once++;
 380                                 if (once > 1) {
 381                                         break;
 382                                 }
 383                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
 384                                 if (alt == NULL) {
 385                                         break;
 386                                 }
 387                         }
 388                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 389                             (alt != net)) {
 390                                 /* Found an alternate address */
 391                                 break;
 392                         }
 393                         mnet = alt;
 394                 }
 395         }
 396         if (alt == NULL) {
 397                 return (net);
 398         }
 399         return (alt);
 400 }
 401
 402 static void
 403 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
 404     struct sctp_nets *net,
 405     int win_probe,
 406     int num_marked, int num_abandoned)
 407 {
 408         if (net->RTO == 0) {
 409                 if (net->RTO_measured) {
 410                         net->RTO = stcb->asoc.minrto;
 411                 } else {
 412                         net->RTO = stcb->asoc.initial_rto;
 413                 }
 414         }
 415         net->RTO <<= 1;
 416         if (net->RTO > stcb->asoc.maxrto) {
 417                 net->RTO = stcb->asoc.maxrto;
 418         }
 419         if ((win_probe == 0) && (num_marked || num_abandoned)) {
 420                 /* We don't apply penalty to window probe scenarios */
 421                 /* JRS - Use the congestion control given in the CC module */
 422                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
 423         }
 424 }
 425
 426 #ifndef INVARIANTS
 427 static void
 428 sctp_recover_sent_list(struct sctp_tcb *stcb)
 429 {
 430         struct sctp_tmit_chunk *chk, *nchk;
 431         struct sctp_association *asoc;
 432
 433         asoc = &stcb->asoc;
 434         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
 435                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
 436                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
 437                             (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
 438                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
 439                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 440                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 441                                 }
 442                         }
 443                         if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
 444                             (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
 445                             TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
 446                                 asoc->trigger_reset = 1;
 447                         }
 448                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 449                         if (PR_SCTP_ENABLED(chk->flags)) {
 450                                 if (asoc->pr_sctp_cnt != 0)
 451                                         asoc->pr_sctp_cnt--;
 452                         }
 453                         if (chk->data) {
 454                                 /* sa_ignore NO_NULL_CHK */
 455                                 sctp_free_bufspace(stcb, asoc, chk, 1);
 456                                 sctp_m_freem(chk->data);
 457                                 chk->data = NULL;
 458                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
 459                                         asoc->sent_queue_cnt_removeable--;
 460                                 }
 461                         }
 462                         asoc->sent_queue_cnt--;
 463                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 464                 }
 465         }
 466         SCTP_PRINTF("after recover order is as follows\n");
 467         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 468                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.tsn);
 469         }
 470 }
 471 #endif
 472
 473 static int
 474 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
 475     struct sctp_nets *net,
 476     struct sctp_nets *alt,
 477     int window_probe,
 478     int *num_marked,
 479     int *num_abandoned)
 480 {
 481
 482         /*
 483          * Mark all chunks (well not all) that were sent to *net for
 484          * retransmission. Move them to alt for there destination as well...
 485          * We only mark chunks that have been outstanding long enough to
 486          * have received feed-back.
 487          */
 488         struct sctp_tmit_chunk *chk, *nchk;
 489         struct sctp_nets *lnets;
 490         struct timeval now, min_wait, tv;
 491         int cur_rto;
 492         int cnt_abandoned;
 493         int audit_tf, num_mk, fir;
 494         unsigned int cnt_mk;
 495         uint32_t orig_flight, orig_tf;
 496         uint32_t tsnlast, tsnfirst;
 497         int recovery_cnt = 0;
 498
 499         /* none in flight now */
 500         audit_tf = 0;
 501         fir = 0;
 502         /*
 503          * figure out how long a data chunk must be pending before we can
 504          * mark it ..
 505          */
 506         (void)SCTP_GETTIME_TIMEVAL(&now);
 507         /* get cur rto in micro-seconds */
 508         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
 509         cur_rto *= 1000;
 510         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 511                 sctp_log_fr(cur_rto,
 512                     stcb->asoc.peers_rwnd,
 513                     window_probe,
 514                     SCTP_FR_T3_MARK_TIME);
 515                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
 516                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
 517         }
 518         tv.tv_sec = cur_rto / 1000000;
 519         tv.tv_usec = cur_rto % 1000000;
 520         min_wait = now;
 521         timevalsub(&min_wait, &tv);
 522         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
 523                 /*
 524                  * if we hit here, we don't have enough seconds on the clock
 525                  * to account for the RTO. We just let the lower seconds be
 526                  * the bounds and don't worry about it. This may mean we
 527                  * will mark a lot more than we should.
 528                  */
 529                 min_wait.tv_sec = min_wait.tv_usec = 0;
 530         }
 531         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 532                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
 533                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
 534         }
 535         /*
 536          * Our rwnd will be incorrect here since we are not adding back the
 537          * cnt * mbuf but we will fix that down below.
 538          */
 539         orig_flight = net->flight_size;
 540         orig_tf = stcb->asoc.total_flight;
 541
 542         net->fast_retran_ip = 0;
 543         /* Now on to each chunk */
 544         cnt_abandoned = 0;
 545         num_mk = cnt_mk = 0;
 546         tsnfirst = tsnlast = 0;
 547 #ifndef INVARIANTS
 548 start_again:
 549 #endif
 550         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
 551                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
 552                         /* Strange case our list got out of order? */
 553                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
 554                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
 555                         recovery_cnt++;
 556 #ifdef INVARIANTS
 557                         panic("last acked >= chk on sent-Q");
 558 #else
 559                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
 560                         sctp_recover_sent_list(stcb);
 561                         if (recovery_cnt < 10) {
 562                                 goto start_again;
 563                         } else {
 564                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
 565                         }
 566 #endif
 567                 }
 568                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
 569                         /*
 570                          * found one to mark: If it is less than
 571                          * DATAGRAM_ACKED it MUST not be a skipped or marked
 572                          * TSN but instead one that is either already set
 573                          * for retransmission OR one that needs
 574                          * retransmission.
 575                          */
 576
 577                         /* validate its been outstanding long enough */
 578                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 579                                 sctp_log_fr(chk->rec.data.tsn,
 580                                     chk->sent_rcv_time.tv_sec,
 581                                     chk->sent_rcv_time.tv_usec,
 582                                     SCTP_FR_T3_MARK_TIME);
 583                         }
 584                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
 585                                 /*
 586                                  * we have reached a chunk that was sent
 587                                  * some seconds past our min.. forget it we
 588                                  * will find no more to send.
 589                                  */
 590                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 591                                         sctp_log_fr(0,
 592                                             chk->sent_rcv_time.tv_sec,
 593                                             chk->sent_rcv_time.tv_usec,
 594                                             SCTP_FR_T3_STOPPED);
 595                                 }
 596                                 continue;
 597                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
 598                             (window_probe == 0)) {
 599                                 /*
 600                                  * we must look at the micro seconds to
 601                                  * know.
 602                                  */
 603                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
 604                                         /*
 605                                          * ok it was sent after our boundary
 606                                          * time.
 607                                          */
 608                                         continue;
 609                                 }
 610                         }
 611                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
 612                                 /* Is it expired? */
 613                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
 614                                         /* Yes so drop it */
 615                                         if (chk->data) {
 616                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 617                                                     chk,
 618                                                     1,
 619                                                     SCTP_SO_NOT_LOCKED);
 620                                                 cnt_abandoned++;
 621                                         }
 622                                         continue;
 623                                 }
 624                         }
 625                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
 626                                 /* Has it been retransmitted tv_sec times? */
 627                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
 628                                         if (chk->data) {
 629                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 630                                                     chk,
 631                                                     1,
 632                                                     SCTP_SO_NOT_LOCKED);
 633                                                 cnt_abandoned++;
 634                                         }
 635                                         continue;
 636                                 }
 637                         }
 638                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 639                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 640                                 num_mk++;
 641                                 if (fir == 0) {
 642                                         fir = 1;
 643                                         tsnfirst = chk->rec.data.tsn;
 644                                 }
 645                                 tsnlast = chk->rec.data.tsn;
 646                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 647                                         sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
 648                                             0, SCTP_FR_T3_MARKED);
 649                                 }
 650
 651                                 if (chk->rec.data.chunk_was_revoked) {
 652                                         /* deflate the cwnd */
 653                                         chk->whoTo->cwnd -= chk->book_size;
 654                                         chk->rec.data.chunk_was_revoked = 0;
 655                                 }
 656                                 net->marked_retrans++;
 657                                 stcb->asoc.marked_retrans++;
 658                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 659                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
 660                                             chk->whoTo->flight_size,
 661                                             chk->book_size,
 662                                             (uint32_t)(uintptr_t)chk->whoTo,
 663                                             chk->rec.data.tsn);
 664                                 }
 665                                 sctp_flight_size_decrease(chk);
 666                                 sctp_total_flight_decrease(stcb, chk);
 667                                 stcb->asoc.peers_rwnd += chk->send_size;
 668                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
 669                         }
 670                         chk->sent = SCTP_DATAGRAM_RESEND;
 671                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 672                         SCTP_STAT_INCR(sctps_markedretrans);
 673
 674                         /* reset the TSN for striking and other FR stuff */
 675                         chk->rec.data.doing_fast_retransmit = 0;
 676                         /* Clear any time so NO RTT is being done */
 677
 678                         if (chk->do_rtt) {
 679                                 if (chk->whoTo->rto_needed == 0) {
 680                                         chk->whoTo->rto_needed = 1;
 681                                 }
 682                         }
 683                         chk->do_rtt = 0;
 684                         if (alt != net) {
 685                                 sctp_free_remote_addr(chk->whoTo);
 686                                 chk->no_fr_allowed = 1;
 687                                 chk->whoTo = alt;
 688                                 atomic_add_int(&alt->ref_count, 1);
 689                         } else {
 690                                 chk->no_fr_allowed = 0;
 691                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 692                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 693                                 } else {
 694                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
 695                                 }
 696                         }
 697                         /*
 698                          * CMT: Do not allow FRs on retransmitted TSNs.
 699                          */
 700                         if (stcb->asoc.sctp_cmt_on_off > 0) {
 701                                 chk->no_fr_allowed = 1;
 702                         }
 703 #ifdef THIS_SHOULD_NOT_BE_DONE
 704                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
 705                         /* remember highest acked one */
 706                         could_be_sent = chk;
 707 #endif
 708                 }
 709                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 710                         cnt_mk++;
 711                 }
 712         }
 713         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
 714                 /* we did not subtract the same things? */
 715                 audit_tf = 1;
 716         }
 717
 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
 793                                 sctp_flight_size_increase(chk);
 794                                 sctp_total_flight_increase(stcb, chk);
 795                         }
 796                 }
 797         }
 798         /* We return 1 if we only have a window probe outstanding */
 799         return (0);
 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         /*
 914          * setup the sat loss recovery that prevents satellite cwnd advance.
 915          */
 916         stcb->asoc.sat_t3_loss_recovery = 1;
 917         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
 918
 919         /* Backoff the timer and cwnd */
 920         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
 921         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 922             (net->dest_state & SCTP_ADDR_PF)) {
 923                 /* Move all pending over too */
 924                 sctp_move_chunks_from_net(stcb, net);
 925
 926                 /*
 927                  * Get the address that failed, to force a new src address
 928                  * selecton and a route allocation.
 929                  */
 930                 if (net->ro._s_addr) {
 931                         sctp_free_ifa(net->ro._s_addr);
 932                         net->ro._s_addr = NULL;
 933                 }
 934                 net->src_addr_selected = 0;
 935
 936                 /* Force a route allocation too */
 937                 RO_NHFREE(&net->ro);
 938
 939                 /* Was it our primary? */
 940                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
 941                         /*
 942                          * Yes, note it as such and find an alternate note:
 943                          * this means HB code must use this to resent the
 944                          * primary if it goes active AND if someone does a
 945                          * change-primary then this flag must be cleared
 946                          * from any net structures.
 947                          */
 948                         if (stcb->asoc.alternate) {
 949                                 sctp_free_remote_addr(stcb->asoc.alternate);
 950                         }
 951                         stcb->asoc.alternate = alt;
 952                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 953                 }
 954         }
 955         /*
 956          * Special case for cookie-echo'ed case, we don't do output but must
 957          * await the COOKIE-ACK before retransmission
 958          */
 959         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 960                 /*
 961                  * Here we just reset the timer and start again since we
 962                  * have not established the asoc
 963                  */
 964                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 965                 return (0);
 966         }
 967         if (stcb->asoc.prsctp_supported) {
 968                 struct sctp_tmit_chunk *lchk;
 969
 970                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
 971                 /* C3. See if we need to send a Fwd-TSN */
 972                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
 973                         send_forward_tsn(stcb, &stcb->asoc);
 974                         for (; lchk != NULL; lchk = TAILQ_NEXT(lchk, sctp_next)) {
 975                                 if (lchk->whoTo != NULL) {
 976                                         break;
 977                                 }
 978                         }
 979                         if (lchk != NULL) {
 980                                 /* Assure a timer is up */
 981                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
 982                         }
 983                 }
 984         }
 985         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
 986                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
 987         }
 988         return (0);
 989 }
 990
 991 int
 992 sctp_t1init_timer(struct sctp_inpcb *inp,
 993     struct sctp_tcb *stcb,
 994     struct sctp_nets *net)
 995 {
 996         /* bump the thresholds */
 997         if (stcb->asoc.delayed_connection) {
 998                 /*
 999                  * special hook for delayed connection. The library did NOT
1000                  * complete the rest of its sends.
1001                  */
1002                 stcb->asoc.delayed_connection = 0;
1003                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1004                 return (0);
1005         }
1006         if (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT) {
1007                 return (0);
1008         }
1009         if (sctp_threshold_management(inp, stcb, net,
1010             stcb->asoc.max_init_times)) {
1011                 /* Association was destroyed */
1012                 return (1);
1013         }
1014         stcb->asoc.dropped_special_cnt = 0;
1015         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1016         if (stcb->asoc.initial_init_rto_max < net->RTO) {
1017                 net->RTO = stcb->asoc.initial_init_rto_max;
1018         }
1019         if (stcb->asoc.numnets > 1) {
1020                 /* If we have more than one addr use it */
1021                 struct sctp_nets *alt;
1022
1023                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1024                 if (alt != stcb->asoc.primary_destination) {
1025                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1026                         stcb->asoc.primary_destination = alt;
1027                 }
1028         }
1029         /* Send out a new init */
1030         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1031         return (0);
1032 }
1033
1034 /*
1035  * For cookie and asconf we actually need to find and mark for resend, then
1036  * increment the resend counter (after all the threshold management stuff of
1037  * course).
1038  */
1039 int
1040 sctp_cookie_timer(struct sctp_inpcb *inp,
1041     struct sctp_tcb *stcb,
1042     struct sctp_nets *net SCTP_UNUSED)
1043 {
1044         struct sctp_nets *alt;
1045         struct sctp_tmit_chunk *cookie;
1046
1047         /* first before all else we must find the cookie */
1048         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1049                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1050                         break;
1051                 }
1052         }
1053         if (cookie == NULL) {
1054                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
1055                         /* FOOBAR! */
1056                         struct mbuf *op_err;
1057
1058                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1059                             "Cookie timer expired, but no cookie");
1060                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
1061                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1062                 } else {
1063 #ifdef INVARIANTS
1064                         panic("Cookie timer expires in wrong state?");
1065 #else
1066                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(stcb));
1067                         return (0);
1068 #endif
1069                 }
1070                 return (0);
1071         }
1072         /* Ok we found the cookie, threshold management next */
1073         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1074             stcb->asoc.max_init_times)) {
1075                 /* Assoc is over */
1076                 return (1);
1077         }
1078         /*
1079          * Cleared threshold management, now lets backoff the address and
1080          * select an alternate
1081          */
1082         stcb->asoc.dropped_special_cnt = 0;
1083         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1084         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1085         if (alt != cookie->whoTo) {
1086                 sctp_free_remote_addr(cookie->whoTo);
1087                 cookie->whoTo = alt;
1088                 atomic_add_int(&alt->ref_count, 1);
1089         }
1090         /* Now mark the retran info */
1091         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1092                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1093         }
1094         cookie->sent = SCTP_DATAGRAM_RESEND;
1095         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1096         /*
1097          * Now call the output routine to kick out the cookie again, Note we
1098          * don't mark any chunks for retran so that FR will need to kick in
1099          * to move these (or a send timer).
1100          */
1101         return (0);
1102 }
1103
1104 int
1105 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
1106 {
1107         struct sctp_nets *alt, *net;
1108         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1109
1110         if (stcb->asoc.stream_reset_outstanding == 0) {
1111                 return (0);
1112         }
1113         /* find the existing STRRESET, we use the seq number we sent out on */
1114         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1115         if (strrst == NULL) {
1116                 return (0);
1117         }
1118         net = strrst->whoTo;
1119         /* do threshold management */
1120         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1121                 /* Assoc is over */
1122                 return (1);
1123         }
1124         /*
1125          * Cleared threshold management, now lets backoff the address and
1126          * select an alternate
1127          */
1128         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1129         alt = sctp_find_alternate_net(stcb, net, 0);
1130         strrst->whoTo = alt;
1131         atomic_add_int(&alt->ref_count, 1);
1132
1133         /* See if a ECN Echo is also stranded */
1134         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1135                 if ((chk->whoTo == net) &&
1136                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1137                         sctp_free_remote_addr(chk->whoTo);
1138                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
1139                                 chk->sent = SCTP_DATAGRAM_RESEND;
1140                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1141                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1142                         }
1143                         chk->whoTo = alt;
1144                         atomic_add_int(&alt->ref_count, 1);
1145                 }
1146         }
1147         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1148                 /*
1149                  * If the address went un-reachable, we need to move to
1150                  * alternates for ALL chk's in queue
1151                  */
1152                 sctp_move_chunks_from_net(stcb, net);
1153         }
1154         sctp_free_remote_addr(net);
1155
1156         /* mark the retran info */
1157         if (strrst->sent != SCTP_DATAGRAM_RESEND)
1158                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1159         strrst->sent = SCTP_DATAGRAM_RESEND;
1160         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1161
1162         /* restart the timer */
1163         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, alt);
1164         return (0);
1165 }
1166
1167 int
1168 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1169     struct sctp_nets *net)
1170 {
1171         struct sctp_nets *alt;
1172         struct sctp_tmit_chunk *asconf, *chk;
1173
1174         /* is this a first send, or a retransmission? */
1175         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1176                 /* compose a new ASCONF chunk and send it */
1177                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1178         } else {
1179                 /*
1180                  * Retransmission of the existing ASCONF is needed
1181                  */
1182
1183                 /* find the existing ASCONF */
1184                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1185                 if (asconf == NULL) {
1186                         return (0);
1187                 }
1188                 net = asconf->whoTo;
1189                 /* do threshold management */
1190                 if (sctp_threshold_management(inp, stcb, net,
1191                     stcb->asoc.max_send_times)) {
1192                         /* Assoc is over */
1193                         return (1);
1194                 }
1195                 if (asconf->snd_count > stcb->asoc.max_send_times) {
1196                         /*
1197                          * Something is rotten: our peer is not responding
1198                          * to ASCONFs but apparently is to other chunks.
1199                          * i.e. it is not properly handling the chunk type
1200                          * upper bits. Mark this peer as ASCONF incapable
1201                          * and cleanup.
1202                          */
1203                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1204                         sctp_asconf_cleanup(stcb);
1205                         return (0);
1206                 }
1207                 /*
1208                  * cleared threshold management, so now backoff the net and
1209                  * select an alternate
1210                  */
1211                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1212                 alt = sctp_find_alternate_net(stcb, net, 0);
1213                 if (asconf->whoTo != alt) {
1214                         asconf->whoTo = alt;
1215                         atomic_add_int(&alt->ref_count, 1);
1216                 }
1217
1218                 /* See if an ECN Echo is also stranded */
1219                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1220                         if ((chk->whoTo == net) &&
1221                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1222                                 sctp_free_remote_addr(chk->whoTo);
1223                                 chk->whoTo = alt;
1224                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1225                                         chk->sent = SCTP_DATAGRAM_RESEND;
1226                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1227                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1228                                 }
1229                                 atomic_add_int(&alt->ref_count, 1);
1230                         }
1231                 }
1232                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1233                         if (chk->whoTo != alt) {
1234                                 sctp_free_remote_addr(chk->whoTo);
1235                                 chk->whoTo = alt;
1236                                 atomic_add_int(&alt->ref_count, 1);
1237                         }
1238                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1239                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1240                         chk->sent = SCTP_DATAGRAM_RESEND;
1241                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1242                 }
1243                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1244                         /*
1245                          * If the address went un-reachable, we need to move
1246                          * to the alternate for ALL chunks in queue
1247                          */
1248                         sctp_move_chunks_from_net(stcb, net);
1249                 }
1250                 sctp_free_remote_addr(net);
1251
1252                 /* mark the retran info */
1253                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1254                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1255                 asconf->sent = SCTP_DATAGRAM_RESEND;
1256                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1257
1258                 /* send another ASCONF if any and we can do */
1259                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1260         }
1261         return (0);
1262 }
1263
1264 /* Mobility adaptation */
1265 void
1266 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
1267 {
1268         if (stcb->asoc.deleted_primary == NULL) {
1269                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1270                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1271                 return;
1272         }
1273         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1274         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1275         sctp_free_remote_addr(stcb->asoc.deleted_primary);
1276         stcb->asoc.deleted_primary = NULL;
1277         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1278         return;
1279 }
1280
1281 /*
1282  * For the shutdown and shutdown-ack, we do not keep one around on the
1283  * control queue. This means we must generate a new one and call the general
1284  * chunk output routine, AFTER having done threshold management.
1285  * It is assumed that net is non-NULL.
1286  */
1287 int
1288 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1289     struct sctp_nets *net)
1290 {
1291         struct sctp_nets *alt;
1292
1293         /* first threshold management */
1294         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1295                 /* Assoc is over */
1296                 return (1);
1297         }
1298         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1299         /* second select an alternative */
1300         alt = sctp_find_alternate_net(stcb, net, 0);
1301
1302         /* third generate a shutdown into the queue for out net */
1303         sctp_send_shutdown(stcb, alt);
1304
1305         /* fourth restart timer */
1306         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1307         return (0);
1308 }
1309
1310 int
1311 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1312     struct sctp_nets *net)
1313 {
1314         struct sctp_nets *alt;
1315
1316         /* first threshold management */
1317         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1318                 /* Assoc is over */
1319                 return (1);
1320         }
1321         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1322         /* second select an alternative */
1323         alt = sctp_find_alternate_net(stcb, net, 0);
1324
1325         /* third generate a shutdown into the queue for out net */
1326         sctp_send_shutdown_ack(stcb, alt);
1327
1328         /* fourth restart timer */
1329         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1330         return (0);
1331 }
1332
1333 static void
1334 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1335     struct sctp_tcb *stcb)
1336 {
1337         struct sctp_stream_queue_pending *sp;
1338         unsigned int i, chks_in_queue = 0;
1339         int being_filled = 0;
1340
1341         /*
1342          * This function is ONLY called when the send/sent queues are empty.
1343          */
1344         if ((stcb == NULL) || (inp == NULL))
1345                 return;
1346
1347         if (stcb->asoc.sent_queue_retran_cnt) {
1348                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1349                     stcb->asoc.sent_queue_retran_cnt);
1350                 stcb->asoc.sent_queue_retran_cnt = 0;
1351         }
1352         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1353                 /* No stream scheduler information, initialize scheduler */
1354                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1355                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1356                         /* yep, we lost a stream or two */
1357                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1358                 } else {
1359                         /* no streams lost */
1360                         stcb->asoc.total_output_queue_size = 0;
1361                 }
1362         }
1363         /* Check to see if some data queued, if so report it */
1364         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1365                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1366                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1367                                 if (sp->msg_is_complete)
1368                                         being_filled++;
1369                                 chks_in_queue++;
1370                         }
1371                 }
1372         }
1373         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1374                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1375                     stcb->asoc.stream_queue_cnt, chks_in_queue);
1376         }
1377         if (chks_in_queue) {
1378                 /* call the output queue function */
1379                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1380                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1381                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1382                         /*
1383                          * Probably should go in and make it go back through
1384                          * and add fragments allowed
1385                          */
1386                         if (being_filled == 0) {
1387                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1388                                     chks_in_queue);
1389                         }
1390                 }
1391         } else {
1392                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1393                     (u_long)stcb->asoc.total_output_queue_size);
1394                 stcb->asoc.total_output_queue_size = 0;
1395         }
1396 }
1397
1398 int
1399 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1400     struct sctp_nets *net)
1401 {
1402         uint8_t net_was_pf;
1403
1404         if (net->dest_state & SCTP_ADDR_PF) {
1405                 net_was_pf = 1;
1406         } else {
1407                 net_was_pf = 0;
1408         }
1409         if (net->hb_responded == 0) {
1410                 if (net->ro._s_addr) {
1411                         /*
1412                          * Invalidate the src address if we did not get a
1413                          * response last time.
1414                          */
1415                         sctp_free_ifa(net->ro._s_addr);
1416                         net->ro._s_addr = NULL;
1417                         net->src_addr_selected = 0;
1418                 }
1419                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1420                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1421                         /* Assoc is over */
1422                         return (1);
1423                 }
1424         }
1425         /* Zero PBA, if it needs it */
1426         if (net->partial_bytes_acked) {
1427                 net->partial_bytes_acked = 0;
1428         }
1429         if ((stcb->asoc.total_output_queue_size > 0) &&
1430             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1431             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1432                 sctp_audit_stream_queues_for_size(inp, stcb);
1433         }
1434         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1435             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1436                 /*
1437                  * when move to PF during threshold mangement, a HB has been
1438                  * queued in that routine
1439                  */
1440                 uint32_t ms_gone_by;
1441
1442                 if ((net->last_sent_time.tv_sec > 0) ||
1443                     (net->last_sent_time.tv_usec > 0)) {
1444                         struct timeval diff;
1445
1446                         SCTP_GETTIME_TIMEVAL(&diff);
1447                         timevalsub(&diff, &net->last_sent_time);
1448                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
1449                             (uint32_t)(diff.tv_usec / 1000);
1450                 } else {
1451                         ms_gone_by = 0xffffffff;
1452                 }
1453                 if ((ms_gone_by >= net->heart_beat_delay) ||
1454                     (net->dest_state & SCTP_ADDR_PF)) {
1455                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1456                 }
1457         }
1458         return (0);
1459 }
1460
1461 void
1462 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1463     struct sctp_tcb *stcb,
1464     struct sctp_nets *net)
1465 {
1466         uint32_t next_mtu, mtu;
1467
1468         next_mtu = sctp_get_next_mtu(net->mtu);
1469
1470         if ((next_mtu > net->mtu) && (net->port == 0)) {
1471                 if ((net->src_addr_selected == 0) ||
1472                     (net->ro._s_addr == NULL) ||
1473                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1474                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1475                                 sctp_free_ifa(net->ro._s_addr);
1476                                 net->ro._s_addr = NULL;
1477                                 net->src_addr_selected = 0;
1478                         } else if (net->ro._s_addr == NULL) {
1479 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1480                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1481                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1482
1483                                         /* KAME hack: embed scopeid */
1484                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1485                                 }
1486 #endif
1487
1488                                 net->ro._s_addr = sctp_source_address_selection(inp,
1489                                     stcb,
1490                                     (sctp_route_t *)&net->ro,
1491                                     net, 0, stcb->asoc.vrf_id);
1492 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1493                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1494                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1495
1496                                         (void)sa6_recoverscope(sin6);
1497                                 }
1498 #endif                          /* INET6 */
1499                         }
1500                         if (net->ro._s_addr)
1501                                 net->src_addr_selected = 1;
1502                 }
1503                 if (net->ro._s_addr) {
1504                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_nh);
1505 #if defined(INET) || defined(INET6)
1506                         if (net->port) {
1507                                 mtu -= sizeof(struct udphdr);
1508                         }
1509 #endif
1510                         if (mtu > next_mtu) {
1511                                 net->mtu = next_mtu;
1512                         } else {
1513                                 net->mtu = mtu;
1514                         }
1515                 }
1516         }
1517         /* restart the timer */
1518         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1519 }
1520
1521 void
1522 sctp_autoclose_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
1523 {
1524         struct timeval tn, *tim_touse;
1525         struct sctp_association *asoc;
1526         uint32_t ticks_gone_by;
1527
1528         (void)SCTP_GETTIME_TIMEVAL(&tn);
1529         if (stcb->asoc.sctp_autoclose_ticks > 0 &&
1530             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1531                 /* Auto close is on */
1532                 asoc = &stcb->asoc;
1533                 /* pick the time to use */
1534                 if (asoc->time_last_rcvd.tv_sec >
1535                     asoc->time_last_sent.tv_sec) {
1536                         tim_touse = &asoc->time_last_rcvd;
1537                 } else {
1538                         tim_touse = &asoc->time_last_sent;
1539                 }
1540                 /* Now has long enough transpired to autoclose? */
1541                 ticks_gone_by = sctp_secs_to_ticks((uint32_t)(tn.tv_sec - tim_touse->tv_sec));
1542                 if (ticks_gone_by >= asoc->sctp_autoclose_ticks) {
1543                         /*
1544                          * autoclose time has hit, call the output routine,
1545                          * which should do nothing just to be SURE we don't
1546                          * have hanging data. We can then safely check the
1547                          * queues and know that we are clear to send
1548                          * shutdown
1549                          */
1550                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1551                         /* Are we clean? */
1552                         if (TAILQ_EMPTY(&asoc->send_queue) &&
1553                             TAILQ_EMPTY(&asoc->sent_queue)) {
1554                                 /*
1555                                  * there is nothing queued to send, so I'm
1556                                  * done...
1557                                  */
1558                                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1559                                         /* only send SHUTDOWN 1st time thru */
1560                                         struct sctp_nets *net;
1561
1562                                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
1563                                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1564                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1565                                         }
1566                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
1567                                         sctp_stop_timers_for_shutdown(stcb);
1568                                         if (stcb->asoc.alternate) {
1569                                                 net = stcb->asoc.alternate;
1570                                         } else {
1571                                                 net = stcb->asoc.primary_destination;
1572                                         }
1573                                         sctp_send_shutdown(stcb, net);
1574                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1575                                             stcb->sctp_ep, stcb, net);
1576                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1577                                             stcb->sctp_ep, stcb, NULL);
1578                                 }
1579                         }
1580                 } else {
1581                         /*
1582                          * No auto close at this time, reset t-o to check
1583                          * later
1584                          */
1585                         uint32_t 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, NULL);
1591                         /* restore the real tick value */
1592                         asoc->sctp_autoclose_ticks = tmp;
1593                 }
1594         }
1595 }