sys/netinet/sctp_timer.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #define _IP_VHL
  37 #include <netinet/sctp_os.h>
  38 #include <netinet/sctp_pcb.h>
  39 #ifdef INET6
  40 #endif
  41 #include <netinet/sctp_var.h>
  42 #include <netinet/sctp_sysctl.h>
  43 #include <netinet/sctp_timer.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_header.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_input.h>
  50 #include <netinet/sctp.h>
  51 #include <netinet/sctp_uio.h>
  52 #if defined(INET) || defined(INET6)
  53 #include <netinet/udp.h>
  54 #endif
  55
  56
  57 void
  58 sctp_audit_retranmission_queue(struct sctp_association *asoc)
  59 {
  60         struct sctp_tmit_chunk *chk;
  61
  62         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
  63             asoc->sent_queue_retran_cnt,
  64             asoc->sent_queue_cnt);
  65         asoc->sent_queue_retran_cnt = 0;
  66         asoc->sent_queue_cnt = 0;
  67         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  68                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  69                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  70                 }
  71                 asoc->sent_queue_cnt++;
  72         }
  73         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
  74                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  75                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  76                 }
  77         }
  78         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
  79                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  80                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  81                 }
  82         }
  83         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
  84             asoc->sent_queue_retran_cnt,
  85             asoc->sent_queue_cnt);
  86 }
  87
  88 int
  89 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  90     struct sctp_nets *net, uint16_t threshold)
  91 {
  92         if (net) {
  93                 net->error_count++;
  94                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
  95                     (void *)net, net->error_count,
  96                     net->failure_threshold);
  97                 if (net->error_count > net->failure_threshold) {
  98                         /* We had a threshold failure */
  99                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 100                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 101                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 102                                 net->dest_state &= ~SCTP_ADDR_PF;
 103                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 104                                     stcb, 0,
 105                                     (void *)net, SCTP_SO_NOT_LOCKED);
 106                         }
 107                 } else if ((net->pf_threshold < net->failure_threshold) &&
 108                     (net->error_count > net->pf_threshold)) {
 109                         if (!(net->dest_state & SCTP_ADDR_PF)) {
 110                                 net->dest_state |= SCTP_ADDR_PF;
 111                                 net->last_active = sctp_get_tick_count();
 112                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 113                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
 114                                     stcb->sctp_ep, stcb, net,
 115                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
 116                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 117                         }
 118                 }
 119         }
 120         if (stcb == NULL)
 121                 return (0);
 122
 123         if (net) {
 124                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
 125                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 126                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
 127                                     stcb->asoc.overall_error_count,
 128                                     (stcb->asoc.overall_error_count + 1),
 129                                     SCTP_FROM_SCTP_TIMER,
 130                                     __LINE__);
 131                         }
 132                         stcb->asoc.overall_error_count++;
 133                 }
 134         } else {
 135                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 136                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
 137                             stcb->asoc.overall_error_count,
 138                             (stcb->asoc.overall_error_count + 1),
 139                             SCTP_FROM_SCTP_TIMER,
 140                             __LINE__);
 141                 }
 142                 stcb->asoc.overall_error_count++;
 143         }
 144         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
 145             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
 146             (uint32_t) threshold,
 147             ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
 148         /*
 149          * We specifically do not do >= to give the assoc one more change
 150          * before we fail it.
 151          */
 152         if (stcb->asoc.overall_error_count > threshold) {
 153                 /* Abort notification sends a ULP notify */
 154                 struct mbuf *op_err;
 155
 156                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
 157                     "Association error counter exceeded");
 158                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
 159                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 160                 return (1);
 161         }
 162         return (0);
 163 }
 164
 165 /*
 166  * sctp_find_alternate_net() returns a non-NULL pointer as long
 167  * the argument net is non-NULL.
 168  */
 169 struct sctp_nets *
 170 sctp_find_alternate_net(struct sctp_tcb *stcb,
 171     struct sctp_nets *net,
 172     int mode)
 173 {
 174         /* Find and return an alternate network if possible */
 175         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
 176         int once;
 177
 178         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
 179         int min_errors = -1;
 180         uint32_t max_cwnd = 0;
 181
 182         if (stcb->asoc.numnets == 1) {
 183                 /* No others but net */
 184                 return (TAILQ_FIRST(&stcb->asoc.nets));
 185         }
 186         /*
 187          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
 188          * net algorithm. This algorithm chooses the active destination (not
 189          * in PF state) with the largest cwnd value. If all destinations are
 190          * in PF state, unreachable, or unconfirmed, choose the desination
 191          * that is in PF state with the lowest error count. In case of a
 192          * tie, choose the destination that was most recently active.
 193          */
 194         if (mode == 2) {
 195                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 196                         /*
 197                          * JRS 5/14/07 - If the destination is unreachable
 198                          * or unconfirmed, skip it.
 199                          */
 200                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 201                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 202                                 continue;
 203                         }
 204                         /*
 205                          * JRS 5/14/07 -  If the destination is reachable
 206                          * but in PF state, compare the error count of the
 207                          * destination to the minimum error count seen thus
 208                          * far. Store the destination with the lower error
 209                          * count.  If the error counts are equal, store the
 210                          * destination that was most recently active.
 211                          */
 212                         if (mnet->dest_state & SCTP_ADDR_PF) {
 213                                 /*
 214                                  * JRS 5/14/07 - If the destination under
 215                                  * consideration is the current destination,
 216                                  * work as if the error count is one higher.
 217                                  * The actual error count will not be
 218                                  * incremented until later in the t3
 219                                  * handler.
 220                                  */
 221                                 if (mnet == net) {
 222                                         if (min_errors == -1) {
 223                                                 min_errors = mnet->error_count + 1;
 224                                                 min_errors_net = mnet;
 225                                         } else if (mnet->error_count + 1 < min_errors) {
 226                                                 min_errors = mnet->error_count + 1;
 227                                                 min_errors_net = mnet;
 228                                         } else if (mnet->error_count + 1 == min_errors
 229                                             && mnet->last_active > min_errors_net->last_active) {
 230                                                 min_errors_net = mnet;
 231                                                 min_errors = mnet->error_count + 1;
 232                                         }
 233                                         continue;
 234                                 } else {
 235                                         if (min_errors == -1) {
 236                                                 min_errors = mnet->error_count;
 237                                                 min_errors_net = mnet;
 238                                         } else if (mnet->error_count < min_errors) {
 239                                                 min_errors = mnet->error_count;
 240                                                 min_errors_net = mnet;
 241                                         } else if (mnet->error_count == min_errors
 242                                             && mnet->last_active > min_errors_net->last_active) {
 243                                                 min_errors_net = mnet;
 244                                                 min_errors = mnet->error_count;
 245                                         }
 246                                         continue;
 247                                 }
 248                         }
 249                         /*
 250                          * JRS 5/14/07 - If the destination is reachable and
 251                          * not in PF state, compare the cwnd of the
 252                          * destination to the highest cwnd seen thus far.
 253                          * Store the destination with the higher cwnd value.
 254                          * If the cwnd values are equal, randomly choose one
 255                          * of the two destinations.
 256                          */
 257                         if (max_cwnd < mnet->cwnd) {
 258                                 max_cwnd_net = mnet;
 259                                 max_cwnd = mnet->cwnd;
 260                         } else if (max_cwnd == mnet->cwnd) {
 261                                 uint32_t rndval;
 262                                 uint8_t this_random;
 263
 264                                 if (stcb->asoc.hb_random_idx > 3) {
 265                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 266                                         memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
 267                                         this_random = stcb->asoc.hb_random_values[0];
 268                                         stcb->asoc.hb_random_idx++;
 269                                         stcb->asoc.hb_ect_randombit = 0;
 270                                 } else {
 271                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 272                                         stcb->asoc.hb_random_idx++;
 273                                         stcb->asoc.hb_ect_randombit = 0;
 274                                 }
 275                                 if (this_random % 2 == 1) {
 276                                         max_cwnd_net = mnet;
 277                                         max_cwnd = mnet->cwnd;  /* Useless? */
 278                                 }
 279                         }
 280                 }
 281                 if (max_cwnd_net == NULL) {
 282                         if (min_errors_net == NULL) {
 283                                 return (net);
 284                         }
 285                         return (min_errors_net);
 286                 } else {
 287                         return (max_cwnd_net);
 288                 }
 289         }
 290         /*
 291          * JRS 5/14/07 - If mode is set to 1, use the CMT policy for
 292          * choosing an alternate net.
 293          */
 294         else if (mode == 1) {
 295                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 296                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 297                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 298                                 /*
 299                                  * will skip ones that are not-reachable or
 300                                  * unconfirmed
 301                                  */
 302                                 continue;
 303                         }
 304                         if (max_cwnd < mnet->cwnd) {
 305                                 max_cwnd_net = mnet;
 306                                 max_cwnd = mnet->cwnd;
 307                         } else if (max_cwnd == mnet->cwnd) {
 308                                 uint32_t rndval;
 309                                 uint8_t this_random;
 310
 311                                 if (stcb->asoc.hb_random_idx > 3) {
 312                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 313                                         memcpy(stcb->asoc.hb_random_values, &rndval,
 314                                             sizeof(stcb->asoc.hb_random_values));
 315                                         this_random = stcb->asoc.hb_random_values[0];
 316                                         stcb->asoc.hb_random_idx = 0;
 317                                         stcb->asoc.hb_ect_randombit = 0;
 318                                 } else {
 319                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 320                                         stcb->asoc.hb_random_idx++;
 321                                         stcb->asoc.hb_ect_randombit = 0;
 322                                 }
 323                                 if (this_random % 2) {
 324                                         max_cwnd_net = mnet;
 325                                         max_cwnd = mnet->cwnd;
 326                                 }
 327                         }
 328                 }
 329                 if (max_cwnd_net) {
 330                         return (max_cwnd_net);
 331                 }
 332         }
 333         mnet = net;
 334         once = 0;
 335
 336         if (mnet == NULL) {
 337                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
 338                 if (mnet == NULL) {
 339                         return (NULL);
 340                 }
 341         }
 342         for (;;) {
 343                 alt = TAILQ_NEXT(mnet, sctp_next);
 344                 if (alt == NULL) {
 345                         once++;
 346                         if (once > 1) {
 347                                 break;
 348                         }
 349                         alt = TAILQ_FIRST(&stcb->asoc.nets);
 350                         if (alt == NULL) {
 351                                 return (NULL);
 352                         }
 353                 }
 354                 if (alt->ro.ro_rt == NULL) {
 355                         if (alt->ro._s_addr) {
 356                                 sctp_free_ifa(alt->ro._s_addr);
 357                                 alt->ro._s_addr = NULL;
 358                         }
 359                         alt->src_addr_selected = 0;
 360                 }
 361                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
 362                     (alt->ro.ro_rt != NULL) &&
 363                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 364                         /* Found a reachable address */
 365                         break;
 366                 }
 367                 mnet = alt;
 368         }
 369
 370         if (alt == NULL) {
 371                 /* Case where NO insv network exists (dormant state) */
 372                 /* we rotate destinations */
 373                 once = 0;
 374                 mnet = net;
 375                 for (;;) {
 376                         if (mnet == NULL) {
 377                                 return (TAILQ_FIRST(&stcb->asoc.nets));
 378                         }
 379                         alt = TAILQ_NEXT(mnet, sctp_next);
 380                         if (alt == NULL) {
 381                                 once++;
 382                                 if (once > 1) {
 383                                         break;
 384                                 }
 385                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
 386                                 if (alt == NULL) {
 387                                         break;
 388                                 }
 389                         }
 390                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 391                             (alt != net)) {
 392                                 /* Found an alternate address */
 393                                 break;
 394                         }
 395                         mnet = alt;
 396                 }
 397         }
 398         if (alt == NULL) {
 399                 return (net);
 400         }
 401         return (alt);
 402 }
 403
 404 static void
 405 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
 406     struct sctp_nets *net,
 407     int win_probe,
 408     int num_marked, int num_abandoned)
 409 {
 410         if (net->RTO == 0) {
 411                 net->RTO = stcb->asoc.minrto;
 412         }
 413         net->RTO <<= 1;
 414         if (net->RTO > stcb->asoc.maxrto) {
 415                 net->RTO = stcb->asoc.maxrto;
 416         }
 417         if ((win_probe == 0) && (num_marked || num_abandoned)) {
 418                 /* We don't apply penalty to window probe scenarios */
 419                 /* JRS - Use the congestion control given in the CC module */
 420                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
 421         }
 422 }
 423
 424 #ifndef INVARIANTS
 425 static void
 426 sctp_recover_sent_list(struct sctp_tcb *stcb)
 427 {
 428         struct sctp_tmit_chunk *chk, *nchk;
 429         struct sctp_association *asoc;
 430
 431         asoc = &stcb->asoc;
 432         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
 433                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
 434                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
 435                             (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
 436                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
 437                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 438                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 439                                 }
 440                         }
 441                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 442                         if (PR_SCTP_ENABLED(chk->flags)) {
 443                                 if (asoc->pr_sctp_cnt != 0)
 444                                         asoc->pr_sctp_cnt--;
 445                         }
 446                         if (chk->data) {
 447                                 /* sa_ignore NO_NULL_CHK */
 448                                 sctp_free_bufspace(stcb, asoc, chk, 1);
 449                                 sctp_m_freem(chk->data);
 450                                 chk->data = NULL;
 451                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
 452                                         asoc->sent_queue_cnt_removeable--;
 453                                 }
 454                         }
 455                         asoc->sent_queue_cnt--;
 456                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 457                 }
 458         }
 459         SCTP_PRINTF("after recover order is as follows\n");
 460         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 461                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
 462         }
 463 }
 464
 465 #endif
 466
 467 static int
 468 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
 469     struct sctp_nets *net,
 470     struct sctp_nets *alt,
 471     int window_probe,
 472     int *num_marked,
 473     int *num_abandoned)
 474 {
 475
 476         /*
 477          * Mark all chunks (well not all) that were sent to *net for
 478          * retransmission. Move them to alt for there destination as well...
 479          * We only mark chunks that have been outstanding long enough to
 480          * have received feed-back.
 481          */
 482         struct sctp_tmit_chunk *chk, *nchk;
 483         struct sctp_nets *lnets;
 484         struct timeval now, min_wait, tv;
 485         int cur_rto;
 486         int cnt_abandoned;
 487         int audit_tf, num_mk, fir;
 488         unsigned int cnt_mk;
 489         uint32_t orig_flight, orig_tf;
 490         uint32_t tsnlast, tsnfirst;
 491         int recovery_cnt = 0;
 492
 493
 494         /* none in flight now */
 495         audit_tf = 0;
 496         fir = 0;
 497         /*
 498          * figure out how long a data chunk must be pending before we can
 499          * mark it ..
 500          */
 501         (void)SCTP_GETTIME_TIMEVAL(&now);
 502         /* get cur rto in micro-seconds */
 503         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
 504         cur_rto *= 1000;
 505         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 506                 sctp_log_fr(cur_rto,
 507                     stcb->asoc.peers_rwnd,
 508                     window_probe,
 509                     SCTP_FR_T3_MARK_TIME);
 510                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
 511                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
 512         }
 513         tv.tv_sec = cur_rto / 1000000;
 514         tv.tv_usec = cur_rto % 1000000;
 515         min_wait = now;
 516         timevalsub(&min_wait, &tv);
 517         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
 518                 /*
 519                  * if we hit here, we don't have enough seconds on the clock
 520                  * to account for the RTO. We just let the lower seconds be
 521                  * the bounds and don't worry about it. This may mean we
 522                  * will mark a lot more than we should.
 523                  */
 524                 min_wait.tv_sec = min_wait.tv_usec = 0;
 525         }
 526         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 527                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
 528                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
 529         }
 530         /*
 531          * Our rwnd will be incorrect here since we are not adding back the
 532          * cnt * mbuf but we will fix that down below.
 533          */
 534         orig_flight = net->flight_size;
 535         orig_tf = stcb->asoc.total_flight;
 536
 537         net->fast_retran_ip = 0;
 538         /* Now on to each chunk */
 539         cnt_abandoned = 0;
 540         num_mk = cnt_mk = 0;
 541         tsnfirst = tsnlast = 0;
 542 #ifndef INVARIANTS
 543 start_again:
 544 #endif
 545         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
 546                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
 547                         /* Strange case our list got out of order? */
 548                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
 549                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
 550                         recovery_cnt++;
 551 #ifdef INVARIANTS
 552                         panic("last acked >= chk on sent-Q");
 553 #else
 554                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
 555                         sctp_recover_sent_list(stcb);
 556                         if (recovery_cnt < 10) {
 557                                 goto start_again;
 558                         } else {
 559                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
 560                         }
 561 #endif
 562                 }
 563                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
 564                         /*
 565                          * found one to mark: If it is less than
 566                          * DATAGRAM_ACKED it MUST not be a skipped or marked
 567                          * TSN but instead one that is either already set
 568                          * for retransmission OR one that needs
 569                          * retransmission.
 570                          */
 571
 572                         /* validate its been outstanding long enough */
 573                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 574                                 sctp_log_fr(chk->rec.data.TSN_seq,
 575                                     chk->sent_rcv_time.tv_sec,
 576                                     chk->sent_rcv_time.tv_usec,
 577                                     SCTP_FR_T3_MARK_TIME);
 578                         }
 579                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
 580                                 /*
 581                                  * we have reached a chunk that was sent
 582                                  * some seconds past our min.. forget it we
 583                                  * will find no more to send.
 584                                  */
 585                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 586                                         sctp_log_fr(0,
 587                                             chk->sent_rcv_time.tv_sec,
 588                                             chk->sent_rcv_time.tv_usec,
 589                                             SCTP_FR_T3_STOPPED);
 590                                 }
 591                                 continue;
 592                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
 593                             (window_probe == 0)) {
 594                                 /*
 595                                  * we must look at the micro seconds to
 596                                  * know.
 597                                  */
 598                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
 599                                         /*
 600                                          * ok it was sent after our boundary
 601                                          * time.
 602                                          */
 603                                         continue;
 604                                 }
 605                         }
 606                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
 607                                 /* Is it expired? */
 608                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
 609                                         /* Yes so drop it */
 610                                         if (chk->data) {
 611                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 612                                                     chk,
 613                                                     1,
 614                                                     SCTP_SO_NOT_LOCKED);
 615                                                 cnt_abandoned++;
 616                                         }
 617                                         continue;
 618                                 }
 619                         }
 620                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
 621                                 /* Has it been retransmitted tv_sec times? */
 622                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
 623                                         if (chk->data) {
 624                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 625                                                     chk,
 626                                                     1,
 627                                                     SCTP_SO_NOT_LOCKED);
 628                                                 cnt_abandoned++;
 629                                         }
 630                                         continue;
 631                                 }
 632                         }
 633                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 634                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 635                                 num_mk++;
 636                                 if (fir == 0) {
 637                                         fir = 1;
 638                                         tsnfirst = chk->rec.data.TSN_seq;
 639                                 }
 640                                 tsnlast = chk->rec.data.TSN_seq;
 641                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 642                                         sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
 643                                             0, SCTP_FR_T3_MARKED);
 644                                 }
 645                                 if (chk->rec.data.chunk_was_revoked) {
 646                                         /* deflate the cwnd */
 647                                         chk->whoTo->cwnd -= chk->book_size;
 648                                         chk->rec.data.chunk_was_revoked = 0;
 649                                 }
 650                                 net->marked_retrans++;
 651                                 stcb->asoc.marked_retrans++;
 652                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 653                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
 654                                             chk->whoTo->flight_size,
 655                                             chk->book_size,
 656                                             (uintptr_t) chk->whoTo,
 657                                             chk->rec.data.TSN_seq);
 658                                 }
 659                                 sctp_flight_size_decrease(chk);
 660                                 sctp_total_flight_decrease(stcb, chk);
 661                                 stcb->asoc.peers_rwnd += chk->send_size;
 662                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
 663                         }
 664                         chk->sent = SCTP_DATAGRAM_RESEND;
 665                         SCTP_STAT_INCR(sctps_markedretrans);
 666
 667                         /* reset the TSN for striking and other FR stuff */
 668                         chk->rec.data.doing_fast_retransmit = 0;
 669                         /* Clear any time so NO RTT is being done */
 670
 671                         if (chk->do_rtt) {
 672                                 if (chk->whoTo->rto_needed == 0) {
 673                                         chk->whoTo->rto_needed = 1;
 674                                 }
 675                         }
 676                         chk->do_rtt = 0;
 677                         if (alt != net) {
 678                                 sctp_free_remote_addr(chk->whoTo);
 679                                 chk->no_fr_allowed = 1;
 680                                 chk->whoTo = alt;
 681                                 atomic_add_int(&alt->ref_count, 1);
 682                         } else {
 683                                 chk->no_fr_allowed = 0;
 684                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 685                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 686                                 } else {
 687                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
 688                                 }
 689                         }
 690                         /*
 691                          * CMT: Do not allow FRs on retransmitted TSNs.
 692                          */
 693                         if (stcb->asoc.sctp_cmt_on_off > 0) {
 694                                 chk->no_fr_allowed = 1;
 695                         }
 696 #ifdef THIS_SHOULD_NOT_BE_DONE
 697                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
 698                         /* remember highest acked one */
 699                         could_be_sent = chk;
 700 #endif
 701                 }
 702                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 703                         cnt_mk++;
 704                 }
 705         }
 706         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
 707                 /* we did not subtract the same things? */
 708                 audit_tf = 1;
 709         }
 710         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 711                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
 712         }
 713 #ifdef SCTP_DEBUG
 714         if (num_mk) {
 715                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 716                     tsnlast);
 717                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
 718                     num_mk, (u_long)stcb->asoc.peers_rwnd);
 719                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 720                     tsnlast);
 721                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
 722                     num_mk,
 723                     (int)stcb->asoc.peers_rwnd);
 724         }
 725 #endif
 726         *num_marked = num_mk;
 727         *num_abandoned = cnt_abandoned;
 728         /*
 729          * Now check for a ECN Echo that may be stranded And include the
 730          * cnt_mk'd to have all resends in the control queue.
 731          */
 732         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 733                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 734                         cnt_mk++;
 735                 }
 736                 if ((chk->whoTo == net) &&
 737                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 738                         sctp_free_remote_addr(chk->whoTo);
 739                         chk->whoTo = alt;
 740                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 741                                 chk->sent = SCTP_DATAGRAM_RESEND;
 742                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 743                                 cnt_mk++;
 744                         }
 745                         atomic_add_int(&alt->ref_count, 1);
 746                 }
 747         }
 748 #ifdef THIS_SHOULD_NOT_BE_DONE
 749         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
 750                 /* fix it so we retransmit the highest acked anyway */
 751                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 752                 cnt_mk++;
 753                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
 754         }
 755 #endif
 756         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
 757 #ifdef INVARIANTS
 758                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
 759                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
 760 #endif
 761 #ifndef SCTP_AUDITING_ENABLED
 762                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
 763 #endif
 764         }
 765         if (audit_tf) {
 766                 SCTPDBG(SCTP_DEBUG_TIMER4,
 767                     "Audit total flight due to negative value net:%p\n",
 768                     (void *)net);
 769                 stcb->asoc.total_flight = 0;
 770                 stcb->asoc.total_flight_count = 0;
 771                 /* Clear all networks flight size */
 772                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
 773                         lnets->flight_size = 0;
 774                         SCTPDBG(SCTP_DEBUG_TIMER4,
 775                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
 776                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
 777                 }
 778                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 779                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 780                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 781                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 782                                             chk->whoTo->flight_size,
 783                                             chk->book_size,
 784                                             (uintptr_t) chk->whoTo,
 785                                             chk->rec.data.TSN_seq);
 786                                 }
 787                                 sctp_flight_size_increase(chk);
 788                                 sctp_total_flight_increase(stcb, chk);
 789                         }
 790                 }
 791         }
 792         /* We return 1 if we only have a window probe outstanding */
 793         return (0);
 794 }
 795
 796
 797 int
 798 sctp_t3rxt_timer(struct sctp_inpcb *inp,
 799     struct sctp_tcb *stcb,
 800     struct sctp_nets *net)
 801 {
 802         struct sctp_nets *alt;
 803         int win_probe, num_mk, num_abandoned;
 804
 805         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 806                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
 807         }
 808         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 809                 struct sctp_nets *lnet;
 810
 811                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
 812                         if (net == lnet) {
 813                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
 814                         } else {
 815                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
 816                         }
 817                 }
 818         }
 819         /* Find an alternate and mark those for retransmission */
 820         if ((stcb->asoc.peers_rwnd == 0) &&
 821             (stcb->asoc.total_flight < net->mtu)) {
 822                 SCTP_STAT_INCR(sctps_timowindowprobe);
 823                 win_probe = 1;
 824         } else {
 825                 win_probe = 0;
 826         }
 827
 828         if (win_probe == 0) {
 829                 /* We don't do normal threshold management on window probes */
 830                 if (sctp_threshold_management(inp, stcb, net,
 831                     stcb->asoc.max_send_times)) {
 832                         /* Association was destroyed */
 833                         return (1);
 834                 } else {
 835                         if (net != stcb->asoc.primary_destination) {
 836                                 /* send a immediate HB if our RTO is stale */
 837                                 struct timeval now;
 838                                 unsigned int ms_goneby;
 839
 840                                 (void)SCTP_GETTIME_TIMEVAL(&now);
 841                                 if (net->last_sent_time.tv_sec) {
 842                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
 843                                 } else {
 844                                         ms_goneby = 0;
 845                                 }
 846                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
 847                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
 848                                                 /*
 849                                                  * no recent feed back in an
 850                                                  * RTO or more, request a
 851                                                  * RTT update
 852                                                  */
 853                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 854                                         }
 855                                 }
 856                         }
 857                 }
 858         } else {
 859                 /*
 860                  * For a window probe we don't penalize the net's but only
 861                  * the association. This may fail it if SACKs are not coming
 862                  * back. If sack's are coming with rwnd locked at 0, we will
 863                  * continue to hold things waiting for rwnd to raise
 864                  */
 865                 if (sctp_threshold_management(inp, stcb, NULL,
 866                     stcb->asoc.max_send_times)) {
 867                         /* Association was destroyed */
 868                         return (1);
 869                 }
 870         }
 871         if (stcb->asoc.sctp_cmt_on_off > 0) {
 872                 if (net->pf_threshold < net->failure_threshold) {
 873                         alt = sctp_find_alternate_net(stcb, net, 2);
 874                 } else {
 875                         /*
 876                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
 877                          * being used, then pick dest with largest ssthresh
 878                          * for any retransmission.
 879                          */
 880                         alt = sctp_find_alternate_net(stcb, net, 1);
 881                         /*
 882                          * CUCv2: If a different dest is picked for the
 883                          * retransmission, then new (rtx-)pseudo_cumack
 884                          * needs to be tracked for orig dest. Let CUCv2
 885                          * track new (rtx-) pseudo-cumack always.
 886                          */
 887                         net->find_pseudo_cumack = 1;
 888                         net->find_rtx_pseudo_cumack = 1;
 889                 }
 890         } else {
 891                 alt = sctp_find_alternate_net(stcb, net, 0);
 892         }
 893
 894         num_mk = 0;
 895         num_abandoned = 0;
 896         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
 897             &num_mk, &num_abandoned);
 898         /* FR Loss recovery just ended with the T3. */
 899         stcb->asoc.fast_retran_loss_recovery = 0;
 900
 901         /* CMT FR loss recovery ended with the T3 */
 902         net->fast_retran_loss_recovery = 0;
 903         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 904             (net->flight_size == 0)) {
 905                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 906         }
 907         /*
 908          * setup the sat loss recovery that prevents satellite cwnd advance.
 909          */
 910         stcb->asoc.sat_t3_loss_recovery = 1;
 911         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
 912
 913         /* Backoff the timer and cwnd */
 914         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
 915         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 916             (net->dest_state & SCTP_ADDR_PF)) {
 917                 /* Move all pending over too */
 918                 sctp_move_chunks_from_net(stcb, net);
 919
 920                 /*
 921                  * Get the address that failed, to force a new src address
 922                  * selecton and a route allocation.
 923                  */
 924                 if (net->ro._s_addr) {
 925                         sctp_free_ifa(net->ro._s_addr);
 926                         net->ro._s_addr = NULL;
 927                 }
 928                 net->src_addr_selected = 0;
 929
 930                 /* Force a route allocation too */
 931                 if (net->ro.ro_rt) {
 932                         RTFREE(net->ro.ro_rt);
 933                         net->ro.ro_rt = NULL;
 934                 }
 935                 /* Was it our primary? */
 936                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
 937                         /*
 938                          * Yes, note it as such and find an alternate note:
 939                          * this means HB code must use this to resent the
 940                          * primary if it goes active AND if someone does a
 941                          * change-primary then this flag must be cleared
 942                          * from any net structures.
 943                          */
 944                         if (stcb->asoc.alternate) {
 945                                 sctp_free_remote_addr(stcb->asoc.alternate);
 946                         }
 947                         stcb->asoc.alternate = alt;
 948                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 949                 }
 950         }
 951         /*
 952          * Special case for cookie-echo'ed case, we don't do output but must
 953          * await the COOKIE-ACK before retransmission
 954          */
 955         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 956                 /*
 957                  * Here we just reset the timer and start again since we
 958                  * have not established the asoc
 959                  */
 960                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 961                 return (0);
 962         }
 963         if (stcb->asoc.prsctp_supported) {
 964                 struct sctp_tmit_chunk *lchk;
 965
 966                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
 967                 /* C3. See if we need to send a Fwd-TSN */
 968                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
 969                         send_forward_tsn(stcb, &stcb->asoc);
 970                         if (lchk) {
 971                                 /* Assure a timer is up */
 972                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
 973                         }
 974                 }
 975         }
 976         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
 977                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
 978         }
 979         return (0);
 980 }
 981
 982 int
 983 sctp_t1init_timer(struct sctp_inpcb *inp,
 984     struct sctp_tcb *stcb,
 985     struct sctp_nets *net)
 986 {
 987         /* bump the thresholds */
 988         if (stcb->asoc.delayed_connection) {
 989                 /*
 990                  * special hook for delayed connection. The library did NOT
 991                  * complete the rest of its sends.
 992                  */
 993                 stcb->asoc.delayed_connection = 0;
 994                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
 995                 return (0);
 996         }
 997         if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
 998                 return (0);
 999         }
1000         if (sctp_threshold_management(inp, stcb, net,
1001             stcb->asoc.max_init_times)) {
1002                 /* Association was destroyed */
1003                 return (1);
1004         }
1005         stcb->asoc.dropped_special_cnt = 0;
1006         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1007         if (stcb->asoc.initial_init_rto_max < net->RTO) {
1008                 net->RTO = stcb->asoc.initial_init_rto_max;
1009         }
1010         if (stcb->asoc.numnets > 1) {
1011                 /* If we have more than one addr use it */
1012                 struct sctp_nets *alt;
1013
1014                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1015                 if (alt != stcb->asoc.primary_destination) {
1016                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1017                         stcb->asoc.primary_destination = alt;
1018                 }
1019         }
1020         /* Send out a new init */
1021         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1022         return (0);
1023 }
1024
1025 /*
1026  * For cookie and asconf we actually need to find and mark for resend, then
1027  * increment the resend counter (after all the threshold management stuff of
1028  * course).
1029  */
1030 int
1031 sctp_cookie_timer(struct sctp_inpcb *inp,
1032     struct sctp_tcb *stcb,
1033     struct sctp_nets *net SCTP_UNUSED)
1034 {
1035         struct sctp_nets *alt;
1036         struct sctp_tmit_chunk *cookie;
1037
1038         /* first before all else we must find the cookie */
1039         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1040                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1041                         break;
1042                 }
1043         }
1044         if (cookie == NULL) {
1045                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
1046                         /* FOOBAR! */
1047                         struct mbuf *op_err;
1048
1049                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
1050                             "Cookie timer expired, but no cookie");
1051                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
1052                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1053                 } else {
1054 #ifdef INVARIANTS
1055                         panic("Cookie timer expires in wrong state?");
1056 #else
1057                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
1058                         return (0);
1059 #endif
1060                 }
1061                 return (0);
1062         }
1063         /* Ok we found the cookie, threshold management next */
1064         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1065             stcb->asoc.max_init_times)) {
1066                 /* Assoc is over */
1067                 return (1);
1068         }
1069         /*
1070          * cleared theshold management now lets backoff the address & select
1071          * an alternate
1072          */
1073         stcb->asoc.dropped_special_cnt = 0;
1074         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1075         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1076         if (alt != cookie->whoTo) {
1077                 sctp_free_remote_addr(cookie->whoTo);
1078                 cookie->whoTo = alt;
1079                 atomic_add_int(&alt->ref_count, 1);
1080         }
1081         /* Now mark the retran info */
1082         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1083                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1084         }
1085         cookie->sent = SCTP_DATAGRAM_RESEND;
1086         /*
1087          * Now call the output routine to kick out the cookie again, Note we
1088          * don't mark any chunks for retran so that FR will need to kick in
1089          * to move these (or a send timer).
1090          */
1091         return (0);
1092 }
1093
1094 int
1095 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1096     struct sctp_nets *net)
1097 {
1098         struct sctp_nets *alt;
1099         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1100
1101         if (stcb->asoc.stream_reset_outstanding == 0) {
1102                 return (0);
1103         }
1104         /* find the existing STRRESET, we use the seq number we sent out on */
1105         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1106         if (strrst == NULL) {
1107                 return (0);
1108         }
1109         /* do threshold management */
1110         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1111             stcb->asoc.max_send_times)) {
1112                 /* Assoc is over */
1113                 return (1);
1114         }
1115         /*
1116          * cleared theshold management now lets backoff the address & select
1117          * an alternate
1118          */
1119         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1120         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1121         sctp_free_remote_addr(strrst->whoTo);
1122         strrst->whoTo = alt;
1123         atomic_add_int(&alt->ref_count, 1);
1124
1125         /* See if a ECN Echo is also stranded */
1126         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1127                 if ((chk->whoTo == net) &&
1128                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1129                         sctp_free_remote_addr(chk->whoTo);
1130                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
1131                                 chk->sent = SCTP_DATAGRAM_RESEND;
1132                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1133                         }
1134                         chk->whoTo = alt;
1135                         atomic_add_int(&alt->ref_count, 1);
1136                 }
1137         }
1138         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1139                 /*
1140                  * If the address went un-reachable, we need to move to
1141                  * alternates for ALL chk's in queue
1142                  */
1143                 sctp_move_chunks_from_net(stcb, net);
1144         }
1145         /* mark the retran info */
1146         if (strrst->sent != SCTP_DATAGRAM_RESEND)
1147                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1148         strrst->sent = SCTP_DATAGRAM_RESEND;
1149
1150         /* restart the timer */
1151         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1152         return (0);
1153 }
1154
1155 int
1156 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1157     struct sctp_nets *net)
1158 {
1159         struct sctp_nets *alt;
1160         struct sctp_tmit_chunk *asconf, *chk;
1161
1162         /* is this a first send, or a retransmission? */
1163         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1164                 /* compose a new ASCONF chunk and send it */
1165                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1166         } else {
1167                 /*
1168                  * Retransmission of the existing ASCONF is needed
1169                  */
1170
1171                 /* find the existing ASCONF */
1172                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1173                 if (asconf == NULL) {
1174                         return (0);
1175                 }
1176                 /* do threshold management */
1177                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1178                     stcb->asoc.max_send_times)) {
1179                         /* Assoc is over */
1180                         return (1);
1181                 }
1182                 if (asconf->snd_count > stcb->asoc.max_send_times) {
1183                         /*
1184                          * Something is rotten: our peer is not responding
1185                          * to ASCONFs but apparently is to other chunks.
1186                          * i.e. it is not properly handling the chunk type
1187                          * upper bits. Mark this peer as ASCONF incapable
1188                          * and cleanup.
1189                          */
1190                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1191                         sctp_asconf_cleanup(stcb, net);
1192                         return (0);
1193                 }
1194                 /*
1195                  * cleared threshold management, so now backoff the net and
1196                  * select an alternate
1197                  */
1198                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1199                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1200                 if (asconf->whoTo != alt) {
1201                         sctp_free_remote_addr(asconf->whoTo);
1202                         asconf->whoTo = alt;
1203                         atomic_add_int(&alt->ref_count, 1);
1204                 }
1205                 /* See if an ECN Echo is also stranded */
1206                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1207                         if ((chk->whoTo == net) &&
1208                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1209                                 sctp_free_remote_addr(chk->whoTo);
1210                                 chk->whoTo = alt;
1211                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1212                                         chk->sent = SCTP_DATAGRAM_RESEND;
1213                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1214                                 }
1215                                 atomic_add_int(&alt->ref_count, 1);
1216                         }
1217                 }
1218                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1219                         if (chk->whoTo != alt) {
1220                                 sctp_free_remote_addr(chk->whoTo);
1221                                 chk->whoTo = alt;
1222                                 atomic_add_int(&alt->ref_count, 1);
1223                         }
1224                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1225                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1226                         chk->sent = SCTP_DATAGRAM_RESEND;
1227                 }
1228                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1229                         /*
1230                          * If the address went un-reachable, we need to move
1231                          * to the alternate for ALL chunks in queue
1232                          */
1233                         sctp_move_chunks_from_net(stcb, net);
1234                 }
1235                 /* mark the retran info */
1236                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1237                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1238                 asconf->sent = SCTP_DATAGRAM_RESEND;
1239
1240                 /* send another ASCONF if any and we can do */
1241                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1242         }
1243         return (0);
1244 }
1245
1246 /* Mobility adaptation */
1247 void
1248 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1249     struct sctp_nets *net SCTP_UNUSED)
1250 {
1251         if (stcb->asoc.deleted_primary == NULL) {
1252                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1253                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1254                 return;
1255         }
1256         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1257         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1258         sctp_free_remote_addr(stcb->asoc.deleted_primary);
1259         stcb->asoc.deleted_primary = NULL;
1260         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1261         return;
1262 }
1263
1264 /*
1265  * For the shutdown and shutdown-ack, we do not keep one around on the
1266  * control queue. This means we must generate a new one and call the general
1267  * chunk output routine, AFTER having done threshold management.
1268  * It is assumed that net is non-NULL.
1269  */
1270 int
1271 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1272     struct sctp_nets *net)
1273 {
1274         struct sctp_nets *alt;
1275
1276         /* first threshold managment */
1277         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1278                 /* Assoc is over */
1279                 return (1);
1280         }
1281         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1282         /* second select an alternative */
1283         alt = sctp_find_alternate_net(stcb, net, 0);
1284
1285         /* third generate a shutdown into the queue for out net */
1286         sctp_send_shutdown(stcb, alt);
1287
1288         /* fourth restart timer */
1289         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1290         return (0);
1291 }
1292
1293 int
1294 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1295     struct sctp_nets *net)
1296 {
1297         struct sctp_nets *alt;
1298
1299         /* first threshold managment */
1300         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1301                 /* Assoc is over */
1302                 return (1);
1303         }
1304         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1305         /* second select an alternative */
1306         alt = sctp_find_alternate_net(stcb, net, 0);
1307
1308         /* third generate a shutdown into the queue for out net */
1309         sctp_send_shutdown_ack(stcb, alt);
1310
1311         /* fourth restart timer */
1312         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1313         return (0);
1314 }
1315
1316 static void
1317 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1318     struct sctp_tcb *stcb)
1319 {
1320         struct sctp_stream_queue_pending *sp;
1321         unsigned int i, chks_in_queue = 0;
1322         int being_filled = 0;
1323
1324         /*
1325          * This function is ONLY called when the send/sent queues are empty.
1326          */
1327         if ((stcb == NULL) || (inp == NULL))
1328                 return;
1329
1330         if (stcb->asoc.sent_queue_retran_cnt) {
1331                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1332                     stcb->asoc.sent_queue_retran_cnt);
1333                 stcb->asoc.sent_queue_retran_cnt = 0;
1334         }
1335         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1336                 /* No stream scheduler information, initialize scheduler */
1337                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1338                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1339                         /* yep, we lost a stream or two */
1340                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1341                 } else {
1342                         /* no streams lost */
1343                         stcb->asoc.total_output_queue_size = 0;
1344                 }
1345         }
1346         /* Check to see if some data queued, if so report it */
1347         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1348                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1349                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1350                                 if (sp->msg_is_complete)
1351                                         being_filled++;
1352                                 chks_in_queue++;
1353                         }
1354                 }
1355         }
1356         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1357                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1358                     stcb->asoc.stream_queue_cnt, chks_in_queue);
1359         }
1360         if (chks_in_queue) {
1361                 /* call the output queue function */
1362                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1363                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1364                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1365                         /*
1366                          * Probably should go in and make it go back through
1367                          * and add fragments allowed
1368                          */
1369                         if (being_filled == 0) {
1370                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1371                                     chks_in_queue);
1372                         }
1373                 }
1374         } else {
1375                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1376                     (u_long)stcb->asoc.total_output_queue_size);
1377                 stcb->asoc.total_output_queue_size = 0;
1378         }
1379 }
1380
1381 int
1382 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1383     struct sctp_nets *net)
1384 {
1385         uint8_t net_was_pf;
1386
1387         if (net->dest_state & SCTP_ADDR_PF) {
1388                 net_was_pf = 1;
1389         } else {
1390                 net_was_pf = 0;
1391         }
1392         if (net->hb_responded == 0) {
1393                 if (net->ro._s_addr) {
1394                         /*
1395                          * Invalidate the src address if we did not get a
1396                          * response last time.
1397                          */
1398                         sctp_free_ifa(net->ro._s_addr);
1399                         net->ro._s_addr = NULL;
1400                         net->src_addr_selected = 0;
1401                 }
1402                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1403                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1404                         /* Assoc is over */
1405                         return (1);
1406                 }
1407         }
1408         /* Zero PBA, if it needs it */
1409         if (net->partial_bytes_acked) {
1410                 net->partial_bytes_acked = 0;
1411         }
1412         if ((stcb->asoc.total_output_queue_size > 0) &&
1413             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1414             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1415                 sctp_audit_stream_queues_for_size(inp, stcb);
1416         }
1417         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1418             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1419                 /*
1420                  * when move to PF during threshold mangement, a HB has been
1421                  * queued in that routine
1422                  */
1423                 uint32_t ms_gone_by;
1424
1425                 if ((net->last_sent_time.tv_sec > 0) ||
1426                     (net->last_sent_time.tv_usec > 0)) {
1427                         struct timeval diff;
1428
1429                         SCTP_GETTIME_TIMEVAL(&diff);
1430                         timevalsub(&diff, &net->last_sent_time);
1431                         ms_gone_by = (uint32_t) (diff.tv_sec * 1000) +
1432                             (uint32_t) (diff.tv_usec / 1000);
1433                 } else {
1434                         ms_gone_by = 0xffffffff;
1435                 }
1436                 if ((ms_gone_by >= net->heart_beat_delay) ||
1437                     (net->dest_state & SCTP_ADDR_PF)) {
1438                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1439                 }
1440         }
1441         return (0);
1442 }
1443
1444 void
1445 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1446     struct sctp_tcb *stcb,
1447     struct sctp_nets *net)
1448 {
1449         uint32_t next_mtu, mtu;
1450
1451         next_mtu = sctp_get_next_mtu(net->mtu);
1452
1453         if ((next_mtu > net->mtu) && (net->port == 0)) {
1454                 if ((net->src_addr_selected == 0) ||
1455                     (net->ro._s_addr == NULL) ||
1456                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1457                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1458                                 sctp_free_ifa(net->ro._s_addr);
1459                                 net->ro._s_addr = NULL;
1460                                 net->src_addr_selected = 0;
1461                         } else if (net->ro._s_addr == NULL) {
1462 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1463                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1464                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1465
1466                                         /* KAME hack: embed scopeid */
1467                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1468                                 }
1469 #endif
1470
1471                                 net->ro._s_addr = sctp_source_address_selection(inp,
1472                                     stcb,
1473                                     (sctp_route_t *) & net->ro,
1474                                     net, 0, stcb->asoc.vrf_id);
1475 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1476                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1477                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1478
1479                                         (void)sa6_recoverscope(sin6);
1480                                 }
1481 #endif                          /* INET6 */
1482                         }
1483                         if (net->ro._s_addr)
1484                                 net->src_addr_selected = 1;
1485                 }
1486                 if (net->ro._s_addr) {
1487                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1488 #if defined(INET) || defined(INET6)
1489                         if (net->port) {
1490                                 mtu -= sizeof(struct udphdr);
1491                         }
1492 #endif
1493                         if (mtu > next_mtu) {
1494                                 net->mtu = next_mtu;
1495                         }
1496                 }
1497         }
1498         /* restart the timer */
1499         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1500 }
1501
1502 void
1503 sctp_autoclose_timer(struct sctp_inpcb *inp,
1504     struct sctp_tcb *stcb,
1505     struct sctp_nets *net)
1506 {
1507         struct timeval tn, *tim_touse;
1508         struct sctp_association *asoc;
1509         int ticks_gone_by;
1510
1511         (void)SCTP_GETTIME_TIMEVAL(&tn);
1512         if (stcb->asoc.sctp_autoclose_ticks &&
1513             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1514                 /* Auto close is on */
1515                 asoc = &stcb->asoc;
1516                 /* pick the time to use */
1517                 if (asoc->time_last_rcvd.tv_sec >
1518                     asoc->time_last_sent.tv_sec) {
1519                         tim_touse = &asoc->time_last_rcvd;
1520                 } else {
1521                         tim_touse = &asoc->time_last_sent;
1522                 }
1523                 /* Now has long enough transpired to autoclose? */
1524                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1525                 if ((ticks_gone_by > 0) &&
1526                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1527                         /*
1528                          * autoclose time has hit, call the output routine,
1529                          * which should do nothing just to be SURE we don't
1530                          * have hanging data. We can then safely check the
1531                          * queues and know that we are clear to send
1532                          * shutdown
1533                          */
1534                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1535                         /* Are we clean? */
1536                         if (TAILQ_EMPTY(&asoc->send_queue) &&
1537                             TAILQ_EMPTY(&asoc->sent_queue)) {
1538                                 /*
1539                                  * there is nothing queued to send, so I'm
1540                                  * done...
1541                                  */
1542                                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1543                                         /* only send SHUTDOWN 1st time thru */
1544                                         struct sctp_nets *netp;
1545
1546                                         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
1547                                             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1548                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1549                                         }
1550                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
1551                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1552                                         sctp_stop_timers_for_shutdown(stcb);
1553                                         if (stcb->asoc.alternate) {
1554                                                 netp = stcb->asoc.alternate;
1555                                         } else {
1556                                                 netp = stcb->asoc.primary_destination;
1557                                         }
1558                                         sctp_send_shutdown(stcb, netp);
1559                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1560                                             stcb->sctp_ep, stcb,
1561                                             netp);
1562                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1563                                             stcb->sctp_ep, stcb,
1564                                             netp);
1565                                 }
1566                         }
1567                 } else {
1568                         /*
1569                          * No auto close at this time, reset t-o to check
1570                          * later
1571                          */
1572                         int tmp;
1573
1574                         /* fool the timer startup to use the time left */
1575                         tmp = asoc->sctp_autoclose_ticks;
1576                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
1577                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1578                             net);
1579                         /* restore the real tick value */
1580                         asoc->sctp_autoclose_ticks = tmp;
1581                 }
1582         }
1583 }