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
 500         /* none in flight now */
 501         audit_tf = 0;
 502         fir = 0;
 503         /*
 504          * figure out how long a data chunk must be pending before we can
 505          * mark it ..
 506          */
 507         (void)SCTP_GETTIME_TIMEVAL(&now);
 508         /* get cur rto in micro-seconds */
 509         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
 510         cur_rto *= 1000;
 511         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 512                 sctp_log_fr(cur_rto,
 513                     stcb->asoc.peers_rwnd,
 514                     window_probe,
 515                     SCTP_FR_T3_MARK_TIME);
 516                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
 517                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
 518         }
 519         tv.tv_sec = cur_rto / 1000000;
 520         tv.tv_usec = cur_rto % 1000000;
 521         min_wait = now;
 522         timevalsub(&min_wait, &tv);
 523         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
 524                 /*
 525                  * if we hit here, we don't have enough seconds on the clock
 526                  * to account for the RTO. We just let the lower seconds be
 527                  * the bounds and don't worry about it. This may mean we
 528                  * will mark a lot more than we should.
 529                  */
 530                 min_wait.tv_sec = min_wait.tv_usec = 0;
 531         }
 532         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 533                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
 534                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
 535         }
 536         /*
 537          * Our rwnd will be incorrect here since we are not adding back the
 538          * cnt * mbuf but we will fix that down below.
 539          */
 540         orig_flight = net->flight_size;
 541         orig_tf = stcb->asoc.total_flight;
 542
 543         net->fast_retran_ip = 0;
 544         /* Now on to each chunk */
 545         cnt_abandoned = 0;
 546         num_mk = cnt_mk = 0;
 547         tsnfirst = tsnlast = 0;
 548 #ifndef INVARIANTS
 549 start_again:
 550 #endif
 551         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
 552                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
 553                         /* Strange case our list got out of order? */
 554                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
 555                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
 556                         recovery_cnt++;
 557 #ifdef INVARIANTS
 558                         panic("last acked >= chk on sent-Q");
 559 #else
 560                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
 561                         sctp_recover_sent_list(stcb);
 562                         if (recovery_cnt < 10) {
 563                                 goto start_again;
 564                         } else {
 565                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
 566                         }
 567 #endif
 568                 }
 569                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
 570                         /*
 571                          * found one to mark: If it is less than
 572                          * DATAGRAM_ACKED it MUST not be a skipped or marked
 573                          * TSN but instead one that is either already set
 574                          * for retransmission OR one that needs
 575                          * retransmission.
 576                          */
 577
 578                         /* validate its been outstanding long enough */
 579                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 580                                 sctp_log_fr(chk->rec.data.tsn,
 581                                     chk->sent_rcv_time.tv_sec,
 582                                     chk->sent_rcv_time.tv_usec,
 583                                     SCTP_FR_T3_MARK_TIME);
 584                         }
 585                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
 586                                 /*
 587                                  * we have reached a chunk that was sent
 588                                  * some seconds past our min.. forget it we
 589                                  * will find no more to send.
 590                                  */
 591                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 592                                         sctp_log_fr(0,
 593                                             chk->sent_rcv_time.tv_sec,
 594                                             chk->sent_rcv_time.tv_usec,
 595                                             SCTP_FR_T3_STOPPED);
 596                                 }
 597                                 continue;
 598                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
 599                             (window_probe == 0)) {
 600                                 /*
 601                                  * we must look at the micro seconds to
 602                                  * know.
 603                                  */
 604                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
 605                                         /*
 606                                          * ok it was sent after our boundary
 607                                          * time.
 608                                          */
 609                                         continue;
 610                                 }
 611                         }
 612                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
 613                                 /* Is it expired? */
 614                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
 615                                         /* Yes so drop it */
 616                                         if (chk->data) {
 617                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 618                                                     chk,
 619                                                     1,
 620                                                     SCTP_SO_NOT_LOCKED);
 621                                                 cnt_abandoned++;
 622                                         }
 623                                         continue;
 624                                 }
 625                         }
 626                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
 627                                 /* Has it been retransmitted tv_sec times? */
 628                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
 629                                         if (chk->data) {
 630                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 631                                                     chk,
 632                                                     1,
 633                                                     SCTP_SO_NOT_LOCKED);
 634                                                 cnt_abandoned++;
 635                                         }
 636                                         continue;
 637                                 }
 638                         }
 639                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 640                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 641                                 num_mk++;
 642                                 if (fir == 0) {
 643                                         fir = 1;
 644                                         tsnfirst = chk->rec.data.tsn;
 645                                 }
 646                                 tsnlast = chk->rec.data.tsn;
 647                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 648                                         sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
 649                                             0, SCTP_FR_T3_MARKED);
 650                                 }
 651
 652                                 if (chk->rec.data.chunk_was_revoked) {
 653                                         /* deflate the cwnd */
 654                                         chk->whoTo->cwnd -= chk->book_size;
 655                                         chk->rec.data.chunk_was_revoked = 0;
 656                                 }
 657                                 net->marked_retrans++;
 658                                 stcb->asoc.marked_retrans++;
 659                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 660                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
 661                                             chk->whoTo->flight_size,
 662                                             chk->book_size,
 663                                             (uint32_t)(uintptr_t)chk->whoTo,
 664                                             chk->rec.data.tsn);
 665                                 }
 666                                 sctp_flight_size_decrease(chk);
 667                                 sctp_total_flight_decrease(stcb, chk);
 668                                 stcb->asoc.peers_rwnd += chk->send_size;
 669                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
 670                         }
 671                         chk->sent = SCTP_DATAGRAM_RESEND;
 672                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 673                         SCTP_STAT_INCR(sctps_markedretrans);
 674
 675                         /* reset the TSN for striking and other FR stuff */
 676                         chk->rec.data.doing_fast_retransmit = 0;
 677                         /* Clear any time so NO RTT is being done */
 678
 679                         if (chk->do_rtt) {
 680                                 if (chk->whoTo->rto_needed == 0) {
 681                                         chk->whoTo->rto_needed = 1;
 682                                 }
 683                         }
 684                         chk->do_rtt = 0;
 685                         if (alt != net) {
 686                                 sctp_free_remote_addr(chk->whoTo);
 687                                 chk->no_fr_allowed = 1;
 688                                 chk->whoTo = alt;
 689                                 atomic_add_int(&alt->ref_count, 1);
 690                         } else {
 691                                 chk->no_fr_allowed = 0;
 692                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 693                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 694                                 } else {
 695                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
 696                                 }
 697                         }
 698                         /*
 699                          * CMT: Do not allow FRs on retransmitted TSNs.
 700                          */
 701                         if (stcb->asoc.sctp_cmt_on_off > 0) {
 702                                 chk->no_fr_allowed = 1;
 703                         }
 704 #ifdef THIS_SHOULD_NOT_BE_DONE
 705                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
 706                         /* remember highest acked one */
 707                         could_be_sent = chk;
 708 #endif
 709                 }
 710                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 711                         cnt_mk++;
 712                 }
 713         }
 714         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
 715                 /* we did not subtract the same things? */
 716                 audit_tf = 1;
 717         }
 718
 719         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 720                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
 721         }
 722 #ifdef SCTP_DEBUG
 723         if (num_mk) {
 724                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 725                     tsnlast);
 726                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
 727                     num_mk,
 728                     stcb->asoc.peers_rwnd);
 729         }
 730 #endif
 731         *num_marked = num_mk;
 732         *num_abandoned = cnt_abandoned;
 733         /*
 734          * Now check for a ECN Echo that may be stranded And include the
 735          * cnt_mk'd to have all resends in the control queue.
 736          */
 737         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 738                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 739                         cnt_mk++;
 740                 }
 741                 if ((chk->whoTo == net) &&
 742                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 743                         sctp_free_remote_addr(chk->whoTo);
 744                         chk->whoTo = alt;
 745                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 746                                 chk->sent = SCTP_DATAGRAM_RESEND;
 747                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 748                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 749                                 cnt_mk++;
 750                         }
 751                         atomic_add_int(&alt->ref_count, 1);
 752                 }
 753         }
 754 #ifdef THIS_SHOULD_NOT_BE_DONE
 755         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
 756                 /* fix it so we retransmit the highest acked anyway */
 757                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 758                 cnt_mk++;
 759                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
 760         }
 761 #endif
 762         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
 763 #ifdef INVARIANTS
 764                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
 765                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
 766 #endif
 767 #ifndef SCTP_AUDITING_ENABLED
 768                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
 769 #endif
 770         }
 771         if (audit_tf) {
 772                 SCTPDBG(SCTP_DEBUG_TIMER4,
 773                     "Audit total flight due to negative value net:%p\n",
 774                     (void *)net);
 775                 stcb->asoc.total_flight = 0;
 776                 stcb->asoc.total_flight_count = 0;
 777                 /* Clear all networks flight size */
 778                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
 779                         lnets->flight_size = 0;
 780                         SCTPDBG(SCTP_DEBUG_TIMER4,
 781                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
 782                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
 783                 }
 784                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 785                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 786                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 787                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 788                                             chk->whoTo->flight_size,
 789                                             chk->book_size,
 790                                             (uint32_t)(uintptr_t)chk->whoTo,
 791                                             chk->rec.data.tsn);
 792                                 }
 793
 794                                 sctp_flight_size_increase(chk);
 795                                 sctp_total_flight_increase(stcb, chk);
 796                         }
 797                 }
 798         }
 799         /* We return 1 if we only have a window probe outstanding */
 800         return (0);
 801 }
 802
 803
 804 int
 805 sctp_t3rxt_timer(struct sctp_inpcb *inp,
 806     struct sctp_tcb *stcb,
 807     struct sctp_nets *net)
 808 {
 809         struct sctp_nets *alt;
 810         int win_probe, num_mk, num_abandoned;
 811
 812         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 813                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
 814         }
 815         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 816                 struct sctp_nets *lnet;
 817
 818                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
 819                         if (net == lnet) {
 820                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
 821                         } else {
 822                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
 823                         }
 824                 }
 825         }
 826         /* Find an alternate and mark those for retransmission */
 827         if ((stcb->asoc.peers_rwnd == 0) &&
 828             (stcb->asoc.total_flight < net->mtu)) {
 829                 SCTP_STAT_INCR(sctps_timowindowprobe);
 830                 win_probe = 1;
 831         } else {
 832                 win_probe = 0;
 833         }
 834
 835         if (win_probe == 0) {
 836                 /* We don't do normal threshold management on window probes */
 837                 if (sctp_threshold_management(inp, stcb, net,
 838                     stcb->asoc.max_send_times)) {
 839                         /* Association was destroyed */
 840                         return (1);
 841                 } else {
 842                         if (net != stcb->asoc.primary_destination) {
 843                                 /* send a immediate HB if our RTO is stale */
 844                                 struct timeval now;
 845                                 unsigned int ms_goneby;
 846
 847                                 (void)SCTP_GETTIME_TIMEVAL(&now);
 848                                 if (net->last_sent_time.tv_sec) {
 849                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
 850                                 } else {
 851                                         ms_goneby = 0;
 852                                 }
 853                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
 854                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
 855                                                 /*
 856                                                  * no recent feed back in an
 857                                                  * RTO or more, request a
 858                                                  * RTT update
 859                                                  */
 860                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 861                                         }
 862                                 }
 863                         }
 864                 }
 865         } else {
 866                 /*
 867                  * For a window probe we don't penalize the net's but only
 868                  * the association. This may fail it if SACKs are not coming
 869                  * back. If sack's are coming with rwnd locked at 0, we will
 870                  * continue to hold things waiting for rwnd to raise
 871                  */
 872                 if (sctp_threshold_management(inp, stcb, NULL,
 873                     stcb->asoc.max_send_times)) {
 874                         /* Association was destroyed */
 875                         return (1);
 876                 }
 877         }
 878         if (stcb->asoc.sctp_cmt_on_off > 0) {
 879                 if (net->pf_threshold < net->failure_threshold) {
 880                         alt = sctp_find_alternate_net(stcb, net, 2);
 881                 } else {
 882                         /*
 883                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
 884                          * being used, then pick dest with largest ssthresh
 885                          * for any retransmission.
 886                          */
 887                         alt = sctp_find_alternate_net(stcb, net, 1);
 888                         /*
 889                          * CUCv2: If a different dest is picked for the
 890                          * retransmission, then new (rtx-)pseudo_cumack
 891                          * needs to be tracked for orig dest. Let CUCv2
 892                          * track new (rtx-) pseudo-cumack always.
 893                          */
 894                         net->find_pseudo_cumack = 1;
 895                         net->find_rtx_pseudo_cumack = 1;
 896                 }
 897         } else {
 898                 alt = sctp_find_alternate_net(stcb, net, 0);
 899         }
 900
 901         num_mk = 0;
 902         num_abandoned = 0;
 903         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
 904             &num_mk, &num_abandoned);
 905         /* FR Loss recovery just ended with the T3. */
 906         stcb->asoc.fast_retran_loss_recovery = 0;
 907
 908         /* CMT FR loss recovery ended with the T3 */
 909         net->fast_retran_loss_recovery = 0;
 910         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 911             (net->flight_size == 0)) {
 912                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 913         }
 914
 915         /*
 916          * setup the sat loss recovery that prevents satellite cwnd advance.
 917          */
 918         stcb->asoc.sat_t3_loss_recovery = 1;
 919         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
 920
 921         /* Backoff the timer and cwnd */
 922         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
 923         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 924             (net->dest_state & SCTP_ADDR_PF)) {
 925                 /* Move all pending over too */
 926                 sctp_move_chunks_from_net(stcb, net);
 927
 928                 /*
 929                  * Get the address that failed, to force a new src address
 930                  * selecton and a route allocation.
 931                  */
 932                 if (net->ro._s_addr) {
 933                         sctp_free_ifa(net->ro._s_addr);
 934                         net->ro._s_addr = NULL;
 935                 }
 936                 net->src_addr_selected = 0;
 937
 938                 /* Force a route allocation too */
 939                 RO_NHFREE(&net->ro);
 940
 941                 /* Was it our primary? */
 942                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
 943                         /*
 944                          * Yes, note it as such and find an alternate note:
 945                          * this means HB code must use this to resent the
 946                          * primary if it goes active AND if someone does a
 947                          * change-primary then this flag must be cleared
 948                          * from any net structures.
 949                          */
 950                         if (stcb->asoc.alternate) {
 951                                 sctp_free_remote_addr(stcb->asoc.alternate);
 952                         }
 953                         stcb->asoc.alternate = alt;
 954                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 955                 }
 956         }
 957         /*
 958          * Special case for cookie-echo'ed case, we don't do output but must
 959          * await the COOKIE-ACK before retransmission
 960          */
 961         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 962                 /*
 963                  * Here we just reset the timer and start again since we
 964                  * have not established the asoc
 965                  */
 966                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 967                 return (0);
 968         }
 969         if (stcb->asoc.prsctp_supported) {
 970                 struct sctp_tmit_chunk *lchk;
 971
 972                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
 973                 /* C3. See if we need to send a Fwd-TSN */
 974                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
 975                         send_forward_tsn(stcb, &stcb->asoc);
 976                         for (; lchk != NULL; lchk = TAILQ_NEXT(lchk, sctp_next)) {
 977                                 if (lchk->whoTo != NULL) {
 978                                         break;
 979                                 }
 980                         }
 981                         if (lchk != NULL) {
 982                                 /* Assure a timer is up */
 983                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
 984                         }
 985                 }
 986         }
 987         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
 988                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
 989         }
 990         return (0);
 991 }
 992
 993 int
 994 sctp_t1init_timer(struct sctp_inpcb *inp,
 995     struct sctp_tcb *stcb,
 996     struct sctp_nets *net)
 997 {
 998         /* bump the thresholds */
 999         if (stcb->asoc.delayed_connection) {
1000                 /*
1001                  * special hook for delayed connection. The library did NOT
1002                  * complete the rest of its sends.
1003                  */
1004                 stcb->asoc.delayed_connection = 0;
1005                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1006                 return (0);
1007         }
1008         if (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT) {
1009                 return (0);
1010         }
1011         if (sctp_threshold_management(inp, stcb, net,
1012             stcb->asoc.max_init_times)) {
1013                 /* Association was destroyed */
1014                 return (1);
1015         }
1016         stcb->asoc.dropped_special_cnt = 0;
1017         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1018         if (stcb->asoc.initial_init_rto_max < net->RTO) {
1019                 net->RTO = stcb->asoc.initial_init_rto_max;
1020         }
1021         if (stcb->asoc.numnets > 1) {
1022                 /* If we have more than one addr use it */
1023                 struct sctp_nets *alt;
1024
1025                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1026                 if (alt != stcb->asoc.primary_destination) {
1027                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1028                         stcb->asoc.primary_destination = alt;
1029                 }
1030         }
1031         /* Send out a new init */
1032         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1033         return (0);
1034 }
1035
1036 /*
1037  * For cookie and asconf we actually need to find and mark for resend, then
1038  * increment the resend counter (after all the threshold management stuff of
1039  * course).
1040  */
1041 int
1042 sctp_cookie_timer(struct sctp_inpcb *inp,
1043     struct sctp_tcb *stcb,
1044     struct sctp_nets *net SCTP_UNUSED)
1045 {
1046         struct sctp_nets *alt;
1047         struct sctp_tmit_chunk *cookie;
1048
1049         /* first before all else we must find the cookie */
1050         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1051                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1052                         break;
1053                 }
1054         }
1055         if (cookie == NULL) {
1056                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
1057                         /* FOOBAR! */
1058                         struct mbuf *op_err;
1059
1060                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1061                             "Cookie timer expired, but no cookie");
1062                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
1063                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1064                 } else {
1065 #ifdef INVARIANTS
1066                         panic("Cookie timer expires in wrong state?");
1067 #else
1068                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(stcb));
1069                         return (0);
1070 #endif
1071                 }
1072                 return (0);
1073         }
1074         /* Ok we found the cookie, threshold management next */
1075         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1076             stcb->asoc.max_init_times)) {
1077                 /* Assoc is over */
1078                 return (1);
1079         }
1080         /*
1081          * Cleared threshold management, now lets backoff the address and
1082          * select an alternate
1083          */
1084         stcb->asoc.dropped_special_cnt = 0;
1085         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1086         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1087         if (alt != cookie->whoTo) {
1088                 sctp_free_remote_addr(cookie->whoTo);
1089                 cookie->whoTo = alt;
1090                 atomic_add_int(&alt->ref_count, 1);
1091         }
1092         /* Now mark the retran info */
1093         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1094                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1095         }
1096         cookie->sent = SCTP_DATAGRAM_RESEND;
1097         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1098         /*
1099          * Now call the output routine to kick out the cookie again, Note we
1100          * don't mark any chunks for retran so that FR will need to kick in
1101          * to move these (or a send timer).
1102          */
1103         return (0);
1104 }
1105
1106 int
1107 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
1108 {
1109         struct sctp_nets *alt, *net;
1110         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1111
1112         if (stcb->asoc.stream_reset_outstanding == 0) {
1113                 return (0);
1114         }
1115         /* find the existing STRRESET, we use the seq number we sent out on */
1116         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1117         if (strrst == NULL) {
1118                 return (0);
1119         }
1120         net = strrst->whoTo;
1121         /* do threshold management */
1122         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1123                 /* Assoc is over */
1124                 return (1);
1125         }
1126         /*
1127          * Cleared threshold management, now lets backoff the address and
1128          * select an alternate
1129          */
1130         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1131         alt = sctp_find_alternate_net(stcb, net, 0);
1132         strrst->whoTo = alt;
1133         atomic_add_int(&alt->ref_count, 1);
1134
1135         /* See if a ECN Echo is also stranded */
1136         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1137                 if ((chk->whoTo == net) &&
1138                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1139                         sctp_free_remote_addr(chk->whoTo);
1140                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
1141                                 chk->sent = SCTP_DATAGRAM_RESEND;
1142                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1143                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1144                         }
1145                         chk->whoTo = alt;
1146                         atomic_add_int(&alt->ref_count, 1);
1147                 }
1148         }
1149         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1150                 /*
1151                  * If the address went un-reachable, we need to move to
1152                  * alternates for ALL chk's in queue
1153                  */
1154                 sctp_move_chunks_from_net(stcb, net);
1155         }
1156         sctp_free_remote_addr(net);
1157
1158         /* mark the retran info */
1159         if (strrst->sent != SCTP_DATAGRAM_RESEND)
1160                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1161         strrst->sent = SCTP_DATAGRAM_RESEND;
1162         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1163
1164         /* restart the timer */
1165         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, alt);
1166         return (0);
1167 }
1168
1169 int
1170 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1171     struct sctp_nets *net)
1172 {
1173         struct sctp_nets *alt;
1174         struct sctp_tmit_chunk *asconf, *chk;
1175
1176         /* is this a first send, or a retransmission? */
1177         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1178                 /* compose a new ASCONF chunk and send it */
1179                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1180         } else {
1181                 /*
1182                  * Retransmission of the existing ASCONF is needed
1183                  */
1184
1185                 /* find the existing ASCONF */
1186                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1187                 if (asconf == NULL) {
1188                         return (0);
1189                 }
1190                 net = asconf->whoTo;
1191                 /* do threshold management */
1192                 if (sctp_threshold_management(inp, stcb, net,
1193                     stcb->asoc.max_send_times)) {
1194                         /* Assoc is over */
1195                         return (1);
1196                 }
1197                 if (asconf->snd_count > stcb->asoc.max_send_times) {
1198                         /*
1199                          * Something is rotten: our peer is not responding
1200                          * to ASCONFs but apparently is to other chunks.
1201                          * i.e. it is not properly handling the chunk type
1202                          * upper bits. Mark this peer as ASCONF incapable
1203                          * and cleanup.
1204                          */
1205                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1206                         sctp_asconf_cleanup(stcb);
1207                         return (0);
1208                 }
1209                 /*
1210                  * cleared threshold management, so now backoff the net and
1211                  * select an alternate
1212                  */
1213                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1214                 alt = sctp_find_alternate_net(stcb, net, 0);
1215                 if (asconf->whoTo != alt) {
1216                         asconf->whoTo = alt;
1217                         atomic_add_int(&alt->ref_count, 1);
1218                 }
1219
1220                 /* See if an ECN Echo is also stranded */
1221                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1222                         if ((chk->whoTo == net) &&
1223                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1224                                 sctp_free_remote_addr(chk->whoTo);
1225                                 chk->whoTo = alt;
1226                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1227                                         chk->sent = SCTP_DATAGRAM_RESEND;
1228                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1229                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1230                                 }
1231                                 atomic_add_int(&alt->ref_count, 1);
1232                         }
1233                 }
1234                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1235                         if (chk->whoTo != alt) {
1236                                 sctp_free_remote_addr(chk->whoTo);
1237                                 chk->whoTo = alt;
1238                                 atomic_add_int(&alt->ref_count, 1);
1239                         }
1240                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1241                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1242                         chk->sent = SCTP_DATAGRAM_RESEND;
1243                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1244                 }
1245                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1246                         /*
1247                          * If the address went un-reachable, we need to move
1248                          * to the alternate for ALL chunks in queue
1249                          */
1250                         sctp_move_chunks_from_net(stcb, net);
1251                 }
1252                 sctp_free_remote_addr(net);
1253
1254                 /* mark the retran info */
1255                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1256                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1257                 asconf->sent = SCTP_DATAGRAM_RESEND;
1258                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1259
1260                 /* send another ASCONF if any and we can do */
1261                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1262         }
1263         return (0);
1264 }
1265
1266 /* Mobility adaptation */
1267 void
1268 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
1269 {
1270         if (stcb->asoc.deleted_primary == NULL) {
1271                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1272                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1273                 return;
1274         }
1275         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1276         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1277         sctp_free_remote_addr(stcb->asoc.deleted_primary);
1278         stcb->asoc.deleted_primary = NULL;
1279         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1280         return;
1281 }
1282
1283 /*
1284  * For the shutdown and shutdown-ack, we do not keep one around on the
1285  * control queue. This means we must generate a new one and call the general
1286  * chunk output routine, AFTER having done threshold management.
1287  * It is assumed that net is non-NULL.
1288  */
1289 int
1290 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1291     struct sctp_nets *net)
1292 {
1293         struct sctp_nets *alt;
1294
1295         /* first threshold management */
1296         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1297                 /* Assoc is over */
1298                 return (1);
1299         }
1300         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1301         /* second select an alternative */
1302         alt = sctp_find_alternate_net(stcb, net, 0);
1303
1304         /* third generate a shutdown into the queue for out net */
1305         sctp_send_shutdown(stcb, alt);
1306
1307         /* fourth restart timer */
1308         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1309         return (0);
1310 }
1311
1312 int
1313 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1314     struct sctp_nets *net)
1315 {
1316         struct sctp_nets *alt;
1317
1318         /* first threshold management */
1319         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1320                 /* Assoc is over */
1321                 return (1);
1322         }
1323         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1324         /* second select an alternative */
1325         alt = sctp_find_alternate_net(stcb, net, 0);
1326
1327         /* third generate a shutdown into the queue for out net */
1328         sctp_send_shutdown_ack(stcb, alt);
1329
1330         /* fourth restart timer */
1331         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1332         return (0);
1333 }
1334
1335 static void
1336 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1337     struct sctp_tcb *stcb)
1338 {
1339         struct sctp_stream_queue_pending *sp;
1340         unsigned int i, chks_in_queue = 0;
1341         int being_filled = 0;
1342
1343         /*
1344          * This function is ONLY called when the send/sent queues are empty.
1345          */
1346         if ((stcb == NULL) || (inp == NULL))
1347                 return;
1348
1349         if (stcb->asoc.sent_queue_retran_cnt) {
1350                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1351                     stcb->asoc.sent_queue_retran_cnt);
1352                 stcb->asoc.sent_queue_retran_cnt = 0;
1353         }
1354         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1355                 /* No stream scheduler information, initialize scheduler */
1356                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1357                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1358                         /* yep, we lost a stream or two */
1359                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1360                 } else {
1361                         /* no streams lost */
1362                         stcb->asoc.total_output_queue_size = 0;
1363                 }
1364         }
1365         /* Check to see if some data queued, if so report it */
1366         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1367                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1368                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1369                                 if (sp->msg_is_complete)
1370                                         being_filled++;
1371                                 chks_in_queue++;
1372                         }
1373                 }
1374         }
1375         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1376                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1377                     stcb->asoc.stream_queue_cnt, chks_in_queue);
1378         }
1379         if (chks_in_queue) {
1380                 /* call the output queue function */
1381                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1382                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1383                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1384                         /*
1385                          * Probably should go in and make it go back through
1386                          * and add fragments allowed
1387                          */
1388                         if (being_filled == 0) {
1389                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1390                                     chks_in_queue);
1391                         }
1392                 }
1393         } else {
1394                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1395                     (u_long)stcb->asoc.total_output_queue_size);
1396                 stcb->asoc.total_output_queue_size = 0;
1397         }
1398 }
1399
1400 int
1401 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1402     struct sctp_nets *net)
1403 {
1404         uint8_t net_was_pf;
1405
1406         if (net->dest_state & SCTP_ADDR_PF) {
1407                 net_was_pf = 1;
1408         } else {
1409                 net_was_pf = 0;
1410         }
1411         if (net->hb_responded == 0) {
1412                 if (net->ro._s_addr) {
1413                         /*
1414                          * Invalidate the src address if we did not get a
1415                          * response last time.
1416                          */
1417                         sctp_free_ifa(net->ro._s_addr);
1418                         net->ro._s_addr = NULL;
1419                         net->src_addr_selected = 0;
1420                 }
1421                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1422                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1423                         /* Assoc is over */
1424                         return (1);
1425                 }
1426         }
1427         /* Zero PBA, if it needs it */
1428         if (net->partial_bytes_acked) {
1429                 net->partial_bytes_acked = 0;
1430         }
1431         if ((stcb->asoc.total_output_queue_size > 0) &&
1432             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1433             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1434                 sctp_audit_stream_queues_for_size(inp, stcb);
1435         }
1436         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1437             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1438                 /*
1439                  * when move to PF during threshold mangement, a HB has been
1440                  * queued in that routine
1441                  */
1442                 uint32_t ms_gone_by;
1443
1444                 if ((net->last_sent_time.tv_sec > 0) ||
1445                     (net->last_sent_time.tv_usec > 0)) {
1446                         struct timeval diff;
1447
1448                         SCTP_GETTIME_TIMEVAL(&diff);
1449                         timevalsub(&diff, &net->last_sent_time);
1450                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
1451                             (uint32_t)(diff.tv_usec / 1000);
1452                 } else {
1453                         ms_gone_by = 0xffffffff;
1454                 }
1455                 if ((ms_gone_by >= net->heart_beat_delay) ||
1456                     (net->dest_state & SCTP_ADDR_PF)) {
1457                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1458                 }
1459         }
1460         return (0);
1461 }
1462
1463 void
1464 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1465     struct sctp_tcb *stcb,
1466     struct sctp_nets *net)
1467 {
1468         uint32_t next_mtu, mtu;
1469
1470         next_mtu = sctp_get_next_mtu(net->mtu);
1471
1472         if ((next_mtu > net->mtu) && (net->port == 0)) {
1473                 if ((net->src_addr_selected == 0) ||
1474                     (net->ro._s_addr == NULL) ||
1475                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1476                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1477                                 sctp_free_ifa(net->ro._s_addr);
1478                                 net->ro._s_addr = NULL;
1479                                 net->src_addr_selected = 0;
1480                         } else if (net->ro._s_addr == NULL) {
1481 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1482                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1483                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1484
1485                                         /* KAME hack: embed scopeid */
1486                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1487                                 }
1488 #endif
1489
1490                                 net->ro._s_addr = sctp_source_address_selection(inp,
1491                                     stcb,
1492                                     (sctp_route_t *)&net->ro,
1493                                     net, 0, stcb->asoc.vrf_id);
1494 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1495                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1496                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1497
1498                                         (void)sa6_recoverscope(sin6);
1499                                 }
1500 #endif                          /* INET6 */
1501                         }
1502                         if (net->ro._s_addr)
1503                                 net->src_addr_selected = 1;
1504                 }
1505                 if (net->ro._s_addr) {
1506                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_nh);
1507 #if defined(INET) || defined(INET6)
1508                         if (net->port) {
1509                                 mtu -= sizeof(struct udphdr);
1510                         }
1511 #endif
1512                         if (mtu > next_mtu) {
1513                                 net->mtu = next_mtu;
1514                         } else {
1515                                 net->mtu = mtu;
1516                         }
1517                 }
1518         }
1519         /* restart the timer */
1520         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1521 }
1522
1523 void
1524 sctp_autoclose_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
1525 {
1526         struct timeval tn, *tim_touse;
1527         struct sctp_association *asoc;
1528         uint32_t ticks_gone_by;
1529
1530         (void)SCTP_GETTIME_TIMEVAL(&tn);
1531         if (stcb->asoc.sctp_autoclose_ticks > 0 &&
1532             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1533                 /* Auto close is on */
1534                 asoc = &stcb->asoc;
1535                 /* pick the time to use */
1536                 if (asoc->time_last_rcvd.tv_sec >
1537                     asoc->time_last_sent.tv_sec) {
1538                         tim_touse = &asoc->time_last_rcvd;
1539                 } else {
1540                         tim_touse = &asoc->time_last_sent;
1541                 }
1542                 /* Now has long enough transpired to autoclose? */
1543                 ticks_gone_by = sctp_secs_to_ticks((uint32_t)(tn.tv_sec - tim_touse->tv_sec));
1544                 if (ticks_gone_by >= asoc->sctp_autoclose_ticks) {
1545                         /*
1546                          * autoclose time has hit, call the output routine,
1547                          * which should do nothing just to be SURE we don't
1548                          * have hanging data. We can then safely check the
1549                          * queues and know that we are clear to send
1550                          * shutdown
1551                          */
1552                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1553                         /* Are we clean? */
1554                         if (TAILQ_EMPTY(&asoc->send_queue) &&
1555                             TAILQ_EMPTY(&asoc->sent_queue)) {
1556                                 /*
1557                                  * there is nothing queued to send, so I'm
1558                                  * done...
1559                                  */
1560                                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1561                                         /* only send SHUTDOWN 1st time thru */
1562                                         struct sctp_nets *net;
1563
1564                                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
1565                                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1566                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1567                                         }
1568                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
1569                                         sctp_stop_timers_for_shutdown(stcb);
1570                                         if (stcb->asoc.alternate) {
1571                                                 net = stcb->asoc.alternate;
1572                                         } else {
1573                                                 net = stcb->asoc.primary_destination;
1574                                         }
1575                                         sctp_send_shutdown(stcb, net);
1576                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1577                                             stcb->sctp_ep, stcb, net);
1578                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1579                                             stcb->sctp_ep, stcb, NULL);
1580                                 }
1581                         }
1582                 } else {
1583                         /*
1584                          * No auto close at this time, reset t-o to check
1585                          * later
1586                          */
1587                         uint32_t tmp;
1588
1589                         /* fool the timer startup to use the time left */
1590                         tmp = asoc->sctp_autoclose_ticks;
1591                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
1592                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
1593                         /* restore the real tick value */
1594                         asoc->sctp_autoclose_ticks = tmp;
1595                 }
1596         }
1597 }