sys/netinet/sctp_timer.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #define _IP_VHL
  37 #include <netinet/sctp_os.h>
  38 #include <netinet/sctp_pcb.h>
  39 #ifdef INET6
  40 #endif
  41 #include <netinet/sctp_var.h>
  42 #include <netinet/sctp_sysctl.h>
  43 #include <netinet/sctp_timer.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_header.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_input.h>
  50 #include <netinet/sctp.h>
  51 #include <netinet/sctp_uio.h>
  52 #if defined(INET) || defined(INET6)
  53 #include <netinet/udp.h>
  54 #endif
  55
  56
  57 void
  58 sctp_audit_retranmission_queue(struct sctp_association *asoc)
  59 {
  60         struct sctp_tmit_chunk *chk;
  61
  62         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
  63             asoc->sent_queue_retran_cnt,
  64             asoc->sent_queue_cnt);
  65         asoc->sent_queue_retran_cnt = 0;
  66         asoc->sent_queue_cnt = 0;
  67         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
  68                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  69                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  70                 }
  71                 asoc->sent_queue_cnt++;
  72         }
  73         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
  74                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  75                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  76                 }
  77         }
  78         TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
  79                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
  80                         sctp_ucount_incr(asoc->sent_queue_retran_cnt);
  81                 }
  82         }
  83         SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
  84             asoc->sent_queue_retran_cnt,
  85             asoc->sent_queue_cnt);
  86 }
  87
  88 static int
  89 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  90     struct sctp_nets *net, uint16_t threshold)
  91 {
  92         if (net) {
  93                 net->error_count++;
  94                 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
  95                     (void *)net, net->error_count,
  96                     net->failure_threshold);
  97                 if (net->error_count > net->failure_threshold) {
  98                         /* We had a threshold failure */
  99                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 100                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 101                                 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 102                                 net->dest_state &= ~SCTP_ADDR_PF;
 103                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 104                                     stcb, 0,
 105                                     (void *)net, SCTP_SO_NOT_LOCKED);
 106                         }
 107                 } else if ((net->pf_threshold < net->failure_threshold) &&
 108                     (net->error_count > net->pf_threshold)) {
 109                         if (!(net->dest_state & SCTP_ADDR_PF)) {
 110                                 net->dest_state |= SCTP_ADDR_PF;
 111                                 net->last_active = sctp_get_tick_count();
 112                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 113                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT,
 114                                     inp, stcb, net,
 115                                     SCTP_FROM_SCTP_TIMER + SCTP_LOC_1);
 116                                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
 117                         }
 118                 }
 119         }
 120         if (stcb == NULL)
 121                 return (0);
 122
 123         if (net) {
 124                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
 125                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 126                                 sctp_misc_ints(SCTP_THRESHOLD_INCR,
 127                                     stcb->asoc.overall_error_count,
 128                                     (stcb->asoc.overall_error_count + 1),
 129                                     SCTP_FROM_SCTP_TIMER,
 130                                     __LINE__);
 131                         }
 132                         stcb->asoc.overall_error_count++;
 133                 }
 134         } else {
 135                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 136                         sctp_misc_ints(SCTP_THRESHOLD_INCR,
 137                             stcb->asoc.overall_error_count,
 138                             (stcb->asoc.overall_error_count + 1),
 139                             SCTP_FROM_SCTP_TIMER,
 140                             __LINE__);
 141                 }
 142                 stcb->asoc.overall_error_count++;
 143         }
 144         SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
 145             (void *)&stcb->asoc, stcb->asoc.overall_error_count,
 146             (uint32_t)threshold,
 147             ((net == NULL) ? (uint32_t)0 : (uint32_t)net->dest_state));
 148         /*
 149          * We specifically do not do >= to give the assoc one more change
 150          * before we fail it.
 151          */
 152         if (stcb->asoc.overall_error_count > threshold) {
 153                 /* Abort notification sends a ULP notify */
 154                 struct mbuf *op_err;
 155
 156                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 157                     "Association error counter exceeded");
 158                 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_2;
 159                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
 160                 return (1);
 161         }
 162         return (0);
 163 }
 164
 165 /*
 166  * sctp_find_alternate_net() returns a non-NULL pointer as long
 167  * the argument net is non-NULL.
 168  */
 169 struct sctp_nets *
 170 sctp_find_alternate_net(struct sctp_tcb *stcb,
 171     struct sctp_nets *net,
 172     int mode)
 173 {
 174         /* Find and return an alternate network if possible */
 175         struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL;
 176         int once;
 177
 178         /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
 179         int min_errors = -1;
 180         uint32_t max_cwnd = 0;
 181
 182         if (stcb->asoc.numnets == 1) {
 183                 /* No others but net */
 184                 return (TAILQ_FIRST(&stcb->asoc.nets));
 185         }
 186         /*
 187          * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate
 188          * net algorithm. This algorithm chooses the active destination (not
 189          * in PF state) with the largest cwnd value. If all destinations are
 190          * in PF state, unreachable, or unconfirmed, choose the desination
 191          * that is in PF state with the lowest error count. In case of a
 192          * tie, choose the destination that was most recently active.
 193          */
 194         if (mode == 2) {
 195                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 196                         /*
 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         }                       /* JRS 5/14/07 - If mode is set to 1, use the
 290                                  * CMT policy for choosing an alternate net. */
 291         else if (mode == 1) {
 292                 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
 293                         if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
 294                             (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 295                                 /*
 296                                  * will skip ones that are not-reachable or
 297                                  * unconfirmed
 298                                  */
 299                                 continue;
 300                         }
 301                         if (max_cwnd < mnet->cwnd) {
 302                                 max_cwnd_net = mnet;
 303                                 max_cwnd = mnet->cwnd;
 304                         } else if (max_cwnd == mnet->cwnd) {
 305                                 uint32_t rndval;
 306                                 uint8_t this_random;
 307
 308                                 if (stcb->asoc.hb_random_idx > 3) {
 309                                         rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 310                                         memcpy(stcb->asoc.hb_random_values, &rndval,
 311                                             sizeof(stcb->asoc.hb_random_values));
 312                                         this_random = stcb->asoc.hb_random_values[0];
 313                                         stcb->asoc.hb_random_idx = 0;
 314                                         stcb->asoc.hb_ect_randombit = 0;
 315                                 } else {
 316                                         this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 317                                         stcb->asoc.hb_random_idx++;
 318                                         stcb->asoc.hb_ect_randombit = 0;
 319                                 }
 320                                 if (this_random % 2) {
 321                                         max_cwnd_net = mnet;
 322                                         max_cwnd = mnet->cwnd;
 323                                 }
 324                         }
 325                 }
 326                 if (max_cwnd_net) {
 327                         return (max_cwnd_net);
 328                 }
 329         }
 330         mnet = net;
 331         once = 0;
 332
 333         if (mnet == NULL) {
 334                 mnet = TAILQ_FIRST(&stcb->asoc.nets);
 335                 if (mnet == NULL) {
 336                         return (NULL);
 337                 }
 338         }
 339         for (;;) {
 340                 alt = TAILQ_NEXT(mnet, sctp_next);
 341                 if (alt == NULL) {
 342                         once++;
 343                         if (once > 1) {
 344                                 break;
 345                         }
 346                         alt = TAILQ_FIRST(&stcb->asoc.nets);
 347                         if (alt == NULL) {
 348                                 return (NULL);
 349                         }
 350                 }
 351                 if (alt->ro.ro_rt == NULL) {
 352                         if (alt->ro._s_addr) {
 353                                 sctp_free_ifa(alt->ro._s_addr);
 354                                 alt->ro._s_addr = NULL;
 355                         }
 356                         alt->src_addr_selected = 0;
 357                 }
 358                 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
 359                     (alt->ro.ro_rt != NULL) &&
 360                     (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 361                         /* Found a reachable address */
 362                         break;
 363                 }
 364                 mnet = alt;
 365         }
 366
 367         if (alt == NULL) {
 368                 /* Case where NO insv network exists (dormant state) */
 369                 /* we rotate destinations */
 370                 once = 0;
 371                 mnet = net;
 372                 for (;;) {
 373                         if (mnet == NULL) {
 374                                 return (TAILQ_FIRST(&stcb->asoc.nets));
 375                         }
 376                         alt = TAILQ_NEXT(mnet, sctp_next);
 377                         if (alt == NULL) {
 378                                 once++;
 379                                 if (once > 1) {
 380                                         break;
 381                                 }
 382                                 alt = TAILQ_FIRST(&stcb->asoc.nets);
 383                                 if (alt == NULL) {
 384                                         break;
 385                                 }
 386                         }
 387                         if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 388                             (alt != net)) {
 389                                 /* Found an alternate address */
 390                                 break;
 391                         }
 392                         mnet = alt;
 393                 }
 394         }
 395         if (alt == NULL) {
 396                 return (net);
 397         }
 398         return (alt);
 399 }
 400
 401 static void
 402 sctp_backoff_on_timeout(struct sctp_tcb *stcb,
 403     struct sctp_nets *net,
 404     int win_probe,
 405     int num_marked, int num_abandoned)
 406 {
 407         if (net->RTO == 0) {
 408                 if (net->RTO_measured) {
 409                         net->RTO = stcb->asoc.minrto;
 410                 } else {
 411                         net->RTO = stcb->asoc.initial_rto;
 412                 }
 413         }
 414         net->RTO <<= 1;
 415         if (net->RTO > stcb->asoc.maxrto) {
 416                 net->RTO = stcb->asoc.maxrto;
 417         }
 418         if ((win_probe == 0) && (num_marked || num_abandoned)) {
 419                 /* We don't apply penalty to window probe scenarios */
 420                 /* JRS - Use the congestion control given in the CC module */
 421                 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
 422         }
 423 }
 424
 425 #ifndef INVARIANTS
 426 static void
 427 sctp_recover_sent_list(struct sctp_tcb *stcb)
 428 {
 429         struct sctp_tmit_chunk *chk, *nchk;
 430         struct sctp_association *asoc;
 431
 432         asoc = &stcb->asoc;
 433         TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
 434                 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.tsn)) {
 435                         SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
 436                             (void *)chk, chk->rec.data.tsn, asoc->last_acked_seq);
 437                         if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
 438                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 439                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 440                                 }
 441                         }
 442                         if ((asoc->strmout[chk->rec.data.sid].chunks_on_queues == 0) &&
 443                             (asoc->strmout[chk->rec.data.sid].state == SCTP_STREAM_RESET_PENDING) &&
 444                             TAILQ_EMPTY(&asoc->strmout[chk->rec.data.sid].outqueue)) {
 445                                 asoc->trigger_reset = 1;
 446                         }
 447                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 448                         if (PR_SCTP_ENABLED(chk->flags)) {
 449                                 if (asoc->pr_sctp_cnt != 0)
 450                                         asoc->pr_sctp_cnt--;
 451                         }
 452                         if (chk->data) {
 453                                 /* sa_ignore NO_NULL_CHK */
 454                                 sctp_free_bufspace(stcb, asoc, chk, 1);
 455                                 sctp_m_freem(chk->data);
 456                                 chk->data = NULL;
 457                                 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
 458                                         asoc->sent_queue_cnt_removeable--;
 459                                 }
 460                         }
 461                         asoc->sent_queue_cnt--;
 462                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 463                 }
 464         }
 465         SCTP_PRINTF("after recover order is as follows\n");
 466         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 467                 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.tsn);
 468         }
 469 }
 470 #endif
 471
 472 static int
 473 sctp_mark_all_for_resend(struct sctp_tcb *stcb,
 474     struct sctp_nets *net,
 475     struct sctp_nets *alt,
 476     int window_probe,
 477     int *num_marked,
 478     int *num_abandoned)
 479 {
 480
 481         /*
 482          * Mark all chunks (well not all) that were sent to *net for
 483          * retransmission. Move them to alt for there destination as well...
 484          * We only mark chunks that have been outstanding long enough to
 485          * have received feed-back.
 486          */
 487         struct sctp_tmit_chunk *chk, *nchk;
 488         struct sctp_nets *lnets;
 489         struct timeval now, min_wait, tv;
 490         int cur_rto;
 491         int cnt_abandoned;
 492         int audit_tf, num_mk, fir;
 493         unsigned int cnt_mk;
 494         uint32_t orig_flight, orig_tf;
 495         uint32_t tsnlast, tsnfirst;
 496         int recovery_cnt = 0;
 497
 498
 499         /* none in flight now */
 500         audit_tf = 0;
 501         fir = 0;
 502         /*
 503          * figure out how long a data chunk must be pending before we can
 504          * mark it ..
 505          */
 506         (void)SCTP_GETTIME_TIMEVAL(&now);
 507         /* get cur rto in micro-seconds */
 508         cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
 509         cur_rto *= 1000;
 510         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 511                 sctp_log_fr(cur_rto,
 512                     stcb->asoc.peers_rwnd,
 513                     window_probe,
 514                     SCTP_FR_T3_MARK_TIME);
 515                 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
 516                 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
 517         }
 518         tv.tv_sec = cur_rto / 1000000;
 519         tv.tv_usec = cur_rto % 1000000;
 520         min_wait = now;
 521         timevalsub(&min_wait, &tv);
 522         if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
 523                 /*
 524                  * if we hit here, we don't have enough seconds on the clock
 525                  * to account for the RTO. We just let the lower seconds be
 526                  * the bounds and don't worry about it. This may mean we
 527                  * will mark a lot more than we should.
 528                  */
 529                 min_wait.tv_sec = min_wait.tv_usec = 0;
 530         }
 531         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 532                 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
 533                 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
 534         }
 535         /*
 536          * Our rwnd will be incorrect here since we are not adding back the
 537          * cnt * mbuf but we will fix that down below.
 538          */
 539         orig_flight = net->flight_size;
 540         orig_tf = stcb->asoc.total_flight;
 541
 542         net->fast_retran_ip = 0;
 543         /* Now on to each chunk */
 544         cnt_abandoned = 0;
 545         num_mk = cnt_mk = 0;
 546         tsnfirst = tsnlast = 0;
 547 #ifndef INVARIANTS
 548 start_again:
 549 #endif
 550         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
 551                 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.tsn)) {
 552                         /* Strange case our list got out of order? */
 553                         SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
 554                             (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.tsn);
 555                         recovery_cnt++;
 556 #ifdef INVARIANTS
 557                         panic("last acked >= chk on sent-Q");
 558 #else
 559                         SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
 560                         sctp_recover_sent_list(stcb);
 561                         if (recovery_cnt < 10) {
 562                                 goto start_again;
 563                         } else {
 564                                 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
 565                         }
 566 #endif
 567                 }
 568                 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
 569                         /*
 570                          * found one to mark: If it is less than
 571                          * DATAGRAM_ACKED it MUST not be a skipped or marked
 572                          * TSN but instead one that is either already set
 573                          * for retransmission OR one that needs
 574                          * retransmission.
 575                          */
 576
 577                         /* validate its been outstanding long enough */
 578                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 579                                 sctp_log_fr(chk->rec.data.tsn,
 580                                     chk->sent_rcv_time.tv_sec,
 581                                     chk->sent_rcv_time.tv_usec,
 582                                     SCTP_FR_T3_MARK_TIME);
 583                         }
 584                         if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
 585                                 /*
 586                                  * we have reached a chunk that was sent
 587                                  * some seconds past our min.. forget it we
 588                                  * will find no more to send.
 589                                  */
 590                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 591                                         sctp_log_fr(0,
 592                                             chk->sent_rcv_time.tv_sec,
 593                                             chk->sent_rcv_time.tv_usec,
 594                                             SCTP_FR_T3_STOPPED);
 595                                 }
 596                                 continue;
 597                         } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
 598                             (window_probe == 0)) {
 599                                 /*
 600                                  * we must look at the micro seconds to
 601                                  * know.
 602                                  */
 603                                 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
 604                                         /*
 605                                          * ok it was sent after our boundary
 606                                          * time.
 607                                          */
 608                                         continue;
 609                                 }
 610                         }
 611                         if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
 612                                 /* Is it expired? */
 613                                 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
 614                                         /* Yes so drop it */
 615                                         if (chk->data) {
 616                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 617                                                     chk,
 618                                                     1,
 619                                                     SCTP_SO_NOT_LOCKED);
 620                                                 cnt_abandoned++;
 621                                         }
 622                                         continue;
 623                                 }
 624                         }
 625                         if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
 626                                 /* Has it been retransmitted tv_sec times? */
 627                                 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
 628                                         if (chk->data) {
 629                                                 (void)sctp_release_pr_sctp_chunk(stcb,
 630                                                     chk,
 631                                                     1,
 632                                                     SCTP_SO_NOT_LOCKED);
 633                                                 cnt_abandoned++;
 634                                         }
 635                                         continue;
 636                                 }
 637                         }
 638                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 639                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 640                                 num_mk++;
 641                                 if (fir == 0) {
 642                                         fir = 1;
 643                                         tsnfirst = chk->rec.data.tsn;
 644                                 }
 645                                 tsnlast = chk->rec.data.tsn;
 646                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 647                                         sctp_log_fr(chk->rec.data.tsn, chk->snd_count,
 648                                             0, SCTP_FR_T3_MARKED);
 649                                 }
 650
 651                                 if (chk->rec.data.chunk_was_revoked) {
 652                                         /* deflate the cwnd */
 653                                         chk->whoTo->cwnd -= chk->book_size;
 654                                         chk->rec.data.chunk_was_revoked = 0;
 655                                 }
 656                                 net->marked_retrans++;
 657                                 stcb->asoc.marked_retrans++;
 658                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 659                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
 660                                             chk->whoTo->flight_size,
 661                                             chk->book_size,
 662                                             (uint32_t)(uintptr_t)chk->whoTo,
 663                                             chk->rec.data.tsn);
 664                                 }
 665                                 sctp_flight_size_decrease(chk);
 666                                 sctp_total_flight_decrease(stcb, chk);
 667                                 stcb->asoc.peers_rwnd += chk->send_size;
 668                                 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
 669                         }
 670                         chk->sent = SCTP_DATAGRAM_RESEND;
 671                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 672                         SCTP_STAT_INCR(sctps_markedretrans);
 673
 674                         /* reset the TSN for striking and other FR stuff */
 675                         chk->rec.data.doing_fast_retransmit = 0;
 676                         /* Clear any time so NO RTT is being done */
 677
 678                         if (chk->do_rtt) {
 679                                 if (chk->whoTo->rto_needed == 0) {
 680                                         chk->whoTo->rto_needed = 1;
 681                                 }
 682                         }
 683                         chk->do_rtt = 0;
 684                         if (alt != net) {
 685                                 sctp_free_remote_addr(chk->whoTo);
 686                                 chk->no_fr_allowed = 1;
 687                                 chk->whoTo = alt;
 688                                 atomic_add_int(&alt->ref_count, 1);
 689                         } else {
 690                                 chk->no_fr_allowed = 0;
 691                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
 692                                         chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
 693                                 } else {
 694                                         chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
 695                                 }
 696                         }
 697                         /*
 698                          * CMT: Do not allow FRs on retransmitted TSNs.
 699                          */
 700                         if (stcb->asoc.sctp_cmt_on_off > 0) {
 701                                 chk->no_fr_allowed = 1;
 702                         }
 703 #ifdef THIS_SHOULD_NOT_BE_DONE
 704                 } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
 705                         /* remember highest acked one */
 706                         could_be_sent = chk;
 707 #endif
 708                 }
 709                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 710                         cnt_mk++;
 711                 }
 712         }
 713         if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
 714                 /* we did not subtract the same things? */
 715                 audit_tf = 1;
 716         }
 717
 718         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 719                 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
 720         }
 721 #ifdef SCTP_DEBUG
 722         if (num_mk) {
 723                 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
 724                     tsnlast);
 725                 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%u\n",
 726                     num_mk,
 727                     stcb->asoc.peers_rwnd);
 728         }
 729 #endif
 730         *num_marked = num_mk;
 731         *num_abandoned = cnt_abandoned;
 732         /*
 733          * Now check for a ECN Echo that may be stranded And include the
 734          * cnt_mk'd to have all resends in the control queue.
 735          */
 736         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 737                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 738                         cnt_mk++;
 739                 }
 740                 if ((chk->whoTo == net) &&
 741                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
 742                         sctp_free_remote_addr(chk->whoTo);
 743                         chk->whoTo = alt;
 744                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 745                                 chk->sent = SCTP_DATAGRAM_RESEND;
 746                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 747                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 748                                 cnt_mk++;
 749                         }
 750                         atomic_add_int(&alt->ref_count, 1);
 751                 }
 752         }
 753 #ifdef THIS_SHOULD_NOT_BE_DONE
 754         if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
 755                 /* fix it so we retransmit the highest acked anyway */
 756                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 757                 cnt_mk++;
 758                 could_be_sent->sent = SCTP_DATAGRAM_RESEND;
 759         }
 760 #endif
 761         if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
 762 #ifdef INVARIANTS
 763                 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
 764                     cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
 765 #endif
 766 #ifndef SCTP_AUDITING_ENABLED
 767                 stcb->asoc.sent_queue_retran_cnt = cnt_mk;
 768 #endif
 769         }
 770         if (audit_tf) {
 771                 SCTPDBG(SCTP_DEBUG_TIMER4,
 772                     "Audit total flight due to negative value net:%p\n",
 773                     (void *)net);
 774                 stcb->asoc.total_flight = 0;
 775                 stcb->asoc.total_flight_count = 0;
 776                 /* Clear all networks flight size */
 777                 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
 778                         lnets->flight_size = 0;
 779                         SCTPDBG(SCTP_DEBUG_TIMER4,
 780                             "Net:%p c-f cwnd:%d ssthresh:%d\n",
 781                             (void *)lnets, lnets->cwnd, lnets->ssthresh);
 782                 }
 783                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 784                         if (chk->sent < SCTP_DATAGRAM_RESEND) {
 785                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 786                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 787                                             chk->whoTo->flight_size,
 788                                             chk->book_size,
 789                                             (uint32_t)(uintptr_t)chk->whoTo,
 790                                             chk->rec.data.tsn);
 791                                 }
 792
 793                                 sctp_flight_size_increase(chk);
 794                                 sctp_total_flight_increase(stcb, chk);
 795                         }
 796                 }
 797         }
 798         /* We return 1 if we only have a window probe outstanding */
 799         return (0);
 800 }
 801
 802
 803 int
 804 sctp_t3rxt_timer(struct sctp_inpcb *inp,
 805     struct sctp_tcb *stcb,
 806     struct sctp_nets *net)
 807 {
 808         struct sctp_nets *alt;
 809         int win_probe, num_mk, num_abandoned;
 810
 811         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
 812                 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
 813         }
 814         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 815                 struct sctp_nets *lnet;
 816
 817                 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
 818                         if (net == lnet) {
 819                                 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
 820                         } else {
 821                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
 822                         }
 823                 }
 824         }
 825         /* Find an alternate and mark those for retransmission */
 826         if ((stcb->asoc.peers_rwnd == 0) &&
 827             (stcb->asoc.total_flight < net->mtu)) {
 828                 SCTP_STAT_INCR(sctps_timowindowprobe);
 829                 win_probe = 1;
 830         } else {
 831                 win_probe = 0;
 832         }
 833
 834         if (win_probe == 0) {
 835                 /* We don't do normal threshold management on window probes */
 836                 if (sctp_threshold_management(inp, stcb, net,
 837                     stcb->asoc.max_send_times)) {
 838                         /* Association was destroyed */
 839                         return (1);
 840                 } else {
 841                         if (net != stcb->asoc.primary_destination) {
 842                                 /* send a immediate HB if our RTO is stale */
 843                                 struct timeval now;
 844                                 unsigned int ms_goneby;
 845
 846                                 (void)SCTP_GETTIME_TIMEVAL(&now);
 847                                 if (net->last_sent_time.tv_sec) {
 848                                         ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
 849                                 } else {
 850                                         ms_goneby = 0;
 851                                 }
 852                                 if ((net->dest_state & SCTP_ADDR_PF) == 0) {
 853                                         if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
 854                                                 /*
 855                                                  * no recent feed back in an
 856                                                  * RTO or more, request a
 857                                                  * RTT update
 858                                                  */
 859                                                 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 860                                         }
 861                                 }
 862                         }
 863                 }
 864         } else {
 865                 /*
 866                  * For a window probe we don't penalize the net's but only
 867                  * the association. This may fail it if SACKs are not coming
 868                  * back. If sack's are coming with rwnd locked at 0, we will
 869                  * continue to hold things waiting for rwnd to raise
 870                  */
 871                 if (sctp_threshold_management(inp, stcb, NULL,
 872                     stcb->asoc.max_send_times)) {
 873                         /* Association was destroyed */
 874                         return (1);
 875                 }
 876         }
 877         if (stcb->asoc.sctp_cmt_on_off > 0) {
 878                 if (net->pf_threshold < net->failure_threshold) {
 879                         alt = sctp_find_alternate_net(stcb, net, 2);
 880                 } else {
 881                         /*
 882                          * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is
 883                          * being used, then pick dest with largest ssthresh
 884                          * for any retransmission.
 885                          */
 886                         alt = sctp_find_alternate_net(stcb, net, 1);
 887                         /*
 888                          * CUCv2: If a different dest is picked for the
 889                          * retransmission, then new (rtx-)pseudo_cumack
 890                          * needs to be tracked for orig dest. Let CUCv2
 891                          * track new (rtx-) pseudo-cumack always.
 892                          */
 893                         net->find_pseudo_cumack = 1;
 894                         net->find_rtx_pseudo_cumack = 1;
 895                 }
 896         } else {
 897                 alt = sctp_find_alternate_net(stcb, net, 0);
 898         }
 899
 900         num_mk = 0;
 901         num_abandoned = 0;
 902         (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
 903             &num_mk, &num_abandoned);
 904         /* FR Loss recovery just ended with the T3. */
 905         stcb->asoc.fast_retran_loss_recovery = 0;
 906
 907         /* CMT FR loss recovery ended with the T3 */
 908         net->fast_retran_loss_recovery = 0;
 909         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 910             (net->flight_size == 0)) {
 911                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 912         }
 913
 914         /*
 915          * setup the sat loss recovery that prevents satellite cwnd advance.
 916          */
 917         stcb->asoc.sat_t3_loss_recovery = 1;
 918         stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
 919
 920         /* Backoff the timer and cwnd */
 921         sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
 922         if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 923             (net->dest_state & SCTP_ADDR_PF)) {
 924                 /* Move all pending over too */
 925                 sctp_move_chunks_from_net(stcb, net);
 926
 927                 /*
 928                  * Get the address that failed, to force a new src address
 929                  * selecton and a route allocation.
 930                  */
 931                 if (net->ro._s_addr) {
 932                         sctp_free_ifa(net->ro._s_addr);
 933                         net->ro._s_addr = NULL;
 934                 }
 935                 net->src_addr_selected = 0;
 936
 937                 /* Force a route allocation too */
 938                 if (net->ro.ro_rt) {
 939                         RTFREE(net->ro.ro_rt);
 940                         net->ro.ro_rt = NULL;
 941                 }
 942
 943                 /* Was it our primary? */
 944                 if ((stcb->asoc.primary_destination == net) && (alt != net)) {
 945                         /*
 946                          * Yes, note it as such and find an alternate note:
 947                          * this means HB code must use this to resent the
 948                          * primary if it goes active AND if someone does a
 949                          * change-primary then this flag must be cleared
 950                          * from any net structures.
 951                          */
 952                         if (stcb->asoc.alternate) {
 953                                 sctp_free_remote_addr(stcb->asoc.alternate);
 954                         }
 955                         stcb->asoc.alternate = alt;
 956                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 957                 }
 958         }
 959         /*
 960          * Special case for cookie-echo'ed case, we don't do output but must
 961          * await the COOKIE-ACK before retransmission
 962          */
 963         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 964                 /*
 965                  * Here we just reset the timer and start again since we
 966                  * have not established the asoc
 967                  */
 968                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 969                 return (0);
 970         }
 971         if (stcb->asoc.prsctp_supported) {
 972                 struct sctp_tmit_chunk *lchk;
 973
 974                 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
 975                 /* C3. See if we need to send a Fwd-TSN */
 976                 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
 977                         send_forward_tsn(stcb, &stcb->asoc);
 978                         if (lchk) {
 979                                 /* Assure a timer is up */
 980                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
 981                         }
 982                 }
 983         }
 984         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
 985                 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
 986         }
 987         return (0);
 988 }
 989
 990 int
 991 sctp_t1init_timer(struct sctp_inpcb *inp,
 992     struct sctp_tcb *stcb,
 993     struct sctp_nets *net)
 994 {
 995         /* bump the thresholds */
 996         if (stcb->asoc.delayed_connection) {
 997                 /*
 998                  * special hook for delayed connection. The library did NOT
 999                  * complete the rest of its sends.
1000                  */
1001                 stcb->asoc.delayed_connection = 0;
1002                 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1003                 return (0);
1004         }
1005         if (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT) {
1006                 return (0);
1007         }
1008         if (sctp_threshold_management(inp, stcb, net,
1009             stcb->asoc.max_init_times)) {
1010                 /* Association was destroyed */
1011                 return (1);
1012         }
1013         stcb->asoc.dropped_special_cnt = 0;
1014         sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
1015         if (stcb->asoc.initial_init_rto_max < net->RTO) {
1016                 net->RTO = stcb->asoc.initial_init_rto_max;
1017         }
1018         if (stcb->asoc.numnets > 1) {
1019                 /* If we have more than one addr use it */
1020                 struct sctp_nets *alt;
1021
1022                 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
1023                 if (alt != stcb->asoc.primary_destination) {
1024                         sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
1025                         stcb->asoc.primary_destination = alt;
1026                 }
1027         }
1028         /* Send out a new init */
1029         sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
1030         return (0);
1031 }
1032
1033 /*
1034  * For cookie and asconf we actually need to find and mark for resend, then
1035  * increment the resend counter (after all the threshold management stuff of
1036  * course).
1037  */
1038 int
1039 sctp_cookie_timer(struct sctp_inpcb *inp,
1040     struct sctp_tcb *stcb,
1041     struct sctp_nets *net SCTP_UNUSED)
1042 {
1043         struct sctp_nets *alt;
1044         struct sctp_tmit_chunk *cookie;
1045
1046         /* first before all else we must find the cookie */
1047         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
1048                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
1049                         break;
1050                 }
1051         }
1052         if (cookie == NULL) {
1053                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
1054                         /* FOOBAR! */
1055                         struct mbuf *op_err;
1056
1057                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1058                             "Cookie timer expired, but no cookie");
1059                         inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_3;
1060                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
1061                 } else {
1062 #ifdef INVARIANTS
1063                         panic("Cookie timer expires in wrong state?");
1064 #else
1065                         SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(stcb));
1066                         return (0);
1067 #endif
1068                 }
1069                 return (0);
1070         }
1071         /* Ok we found the cookie, threshold management next */
1072         if (sctp_threshold_management(inp, stcb, cookie->whoTo,
1073             stcb->asoc.max_init_times)) {
1074                 /* Assoc is over */
1075                 return (1);
1076         }
1077         /*
1078          * Cleared threshold management, now lets backoff the address and
1079          * select an alternate
1080          */
1081         stcb->asoc.dropped_special_cnt = 0;
1082         sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
1083         alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
1084         if (alt != cookie->whoTo) {
1085                 sctp_free_remote_addr(cookie->whoTo);
1086                 cookie->whoTo = alt;
1087                 atomic_add_int(&alt->ref_count, 1);
1088         }
1089         /* Now mark the retran info */
1090         if (cookie->sent != SCTP_DATAGRAM_RESEND) {
1091                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1092         }
1093         cookie->sent = SCTP_DATAGRAM_RESEND;
1094         cookie->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1095         /*
1096          * Now call the output routine to kick out the cookie again, Note we
1097          * don't mark any chunks for retran so that FR will need to kick in
1098          * to move these (or a send timer).
1099          */
1100         return (0);
1101 }
1102
1103 int
1104 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1105     struct sctp_nets *net)
1106 {
1107         struct sctp_nets *alt;
1108         struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
1109
1110         if (stcb->asoc.stream_reset_outstanding == 0) {
1111                 return (0);
1112         }
1113         /* find the existing STRRESET, we use the seq number we sent out on */
1114         (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
1115         if (strrst == NULL) {
1116                 return (0);
1117         }
1118         /* do threshold management */
1119         if (sctp_threshold_management(inp, stcb, strrst->whoTo,
1120             stcb->asoc.max_send_times)) {
1121                 /* Assoc is over */
1122                 return (1);
1123         }
1124         /*
1125          * Cleared threshold management, now lets backoff the address and
1126          * select an alternate
1127          */
1128         sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
1129         alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
1130         sctp_free_remote_addr(strrst->whoTo);
1131         strrst->whoTo = alt;
1132         atomic_add_int(&alt->ref_count, 1);
1133
1134         /* See if a ECN Echo is also stranded */
1135         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1136                 if ((chk->whoTo == net) &&
1137                     (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1138                         sctp_free_remote_addr(chk->whoTo);
1139                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
1140                                 chk->sent = SCTP_DATAGRAM_RESEND;
1141                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1142                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1143                         }
1144                         chk->whoTo = alt;
1145                         atomic_add_int(&alt->ref_count, 1);
1146                 }
1147         }
1148         if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1149                 /*
1150                  * If the address went un-reachable, we need to move to
1151                  * alternates for ALL chk's in queue
1152                  */
1153                 sctp_move_chunks_from_net(stcb, net);
1154         }
1155         /* mark the retran info */
1156         if (strrst->sent != SCTP_DATAGRAM_RESEND)
1157                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1158         strrst->sent = SCTP_DATAGRAM_RESEND;
1159         strrst->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1160
1161         /* restart the timer */
1162         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
1163         return (0);
1164 }
1165
1166 int
1167 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1168     struct sctp_nets *net)
1169 {
1170         struct sctp_nets *alt;
1171         struct sctp_tmit_chunk *asconf, *chk;
1172
1173         /* is this a first send, or a retransmission? */
1174         if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
1175                 /* compose a new ASCONF chunk and send it */
1176                 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
1177         } else {
1178                 /*
1179                  * Retransmission of the existing ASCONF is needed
1180                  */
1181
1182                 /* find the existing ASCONF */
1183                 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
1184                 if (asconf == NULL) {
1185                         return (0);
1186                 }
1187                 /* do threshold management */
1188                 if (sctp_threshold_management(inp, stcb, asconf->whoTo,
1189                     stcb->asoc.max_send_times)) {
1190                         /* Assoc is over */
1191                         return (1);
1192                 }
1193                 if (asconf->snd_count > stcb->asoc.max_send_times) {
1194                         /*
1195                          * Something is rotten: our peer is not responding
1196                          * to ASCONFs but apparently is to other chunks.
1197                          * i.e. it is not properly handling the chunk type
1198                          * upper bits. Mark this peer as ASCONF incapable
1199                          * and cleanup.
1200                          */
1201                         SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
1202                         sctp_asconf_cleanup(stcb, net);
1203                         return (0);
1204                 }
1205                 /*
1206                  * cleared threshold management, so now backoff the net and
1207                  * select an alternate
1208                  */
1209                 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
1210                 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
1211                 if (asconf->whoTo != alt) {
1212                         sctp_free_remote_addr(asconf->whoTo);
1213                         asconf->whoTo = alt;
1214                         atomic_add_int(&alt->ref_count, 1);
1215                 }
1216
1217                 /* See if an ECN Echo is also stranded */
1218                 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
1219                         if ((chk->whoTo == net) &&
1220                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
1221                                 sctp_free_remote_addr(chk->whoTo);
1222                                 chk->whoTo = alt;
1223                                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
1224                                         chk->sent = SCTP_DATAGRAM_RESEND;
1225                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1226                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1227                                 }
1228                                 atomic_add_int(&alt->ref_count, 1);
1229                         }
1230                 }
1231                 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
1232                         if (chk->whoTo != alt) {
1233                                 sctp_free_remote_addr(chk->whoTo);
1234                                 chk->whoTo = alt;
1235                                 atomic_add_int(&alt->ref_count, 1);
1236                         }
1237                         if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
1238                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1239                         chk->sent = SCTP_DATAGRAM_RESEND;
1240                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1241                 }
1242                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
1243                         /*
1244                          * If the address went un-reachable, we need to move
1245                          * to the alternate for ALL chunks in queue
1246                          */
1247                         sctp_move_chunks_from_net(stcb, net);
1248                 }
1249                 /* mark the retran info */
1250                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
1251                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1252                 asconf->sent = SCTP_DATAGRAM_RESEND;
1253                 asconf->flags |= CHUNK_FLAGS_FRAGMENT_OK;
1254
1255                 /* send another ASCONF if any and we can do */
1256                 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
1257         }
1258         return (0);
1259 }
1260
1261 /* Mobility adaptation */
1262 void
1263 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1264     struct sctp_nets *net SCTP_UNUSED)
1265 {
1266         if (stcb->asoc.deleted_primary == NULL) {
1267                 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
1268                 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1269                 return;
1270         }
1271         SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
1272         SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
1273         sctp_free_remote_addr(stcb->asoc.deleted_primary);
1274         stcb->asoc.deleted_primary = NULL;
1275         sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
1276         return;
1277 }
1278
1279 /*
1280  * For the shutdown and shutdown-ack, we do not keep one around on the
1281  * control queue. This means we must generate a new one and call the general
1282  * chunk output routine, AFTER having done threshold management.
1283  * It is assumed that net is non-NULL.
1284  */
1285 int
1286 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1287     struct sctp_nets *net)
1288 {
1289         struct sctp_nets *alt;
1290
1291         /* first threshold management */
1292         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1293                 /* Assoc is over */
1294                 return (1);
1295         }
1296         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1297         /* second select an alternative */
1298         alt = sctp_find_alternate_net(stcb, net, 0);
1299
1300         /* third generate a shutdown into the queue for out net */
1301         sctp_send_shutdown(stcb, alt);
1302
1303         /* fourth restart timer */
1304         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
1305         return (0);
1306 }
1307
1308 int
1309 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1310     struct sctp_nets *net)
1311 {
1312         struct sctp_nets *alt;
1313
1314         /* first threshold management */
1315         if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1316                 /* Assoc is over */
1317                 return (1);
1318         }
1319         sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1320         /* second select an alternative */
1321         alt = sctp_find_alternate_net(stcb, net, 0);
1322
1323         /* third generate a shutdown into the queue for out net */
1324         sctp_send_shutdown_ack(stcb, alt);
1325
1326         /* fourth restart timer */
1327         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
1328         return (0);
1329 }
1330
1331 static void
1332 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
1333     struct sctp_tcb *stcb)
1334 {
1335         struct sctp_stream_queue_pending *sp;
1336         unsigned int i, chks_in_queue = 0;
1337         int being_filled = 0;
1338
1339         /*
1340          * This function is ONLY called when the send/sent queues are empty.
1341          */
1342         if ((stcb == NULL) || (inp == NULL))
1343                 return;
1344
1345         if (stcb->asoc.sent_queue_retran_cnt) {
1346                 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
1347                     stcb->asoc.sent_queue_retran_cnt);
1348                 stcb->asoc.sent_queue_retran_cnt = 0;
1349         }
1350         if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1351                 /* No stream scheduler information, initialize scheduler */
1352                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
1353                 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
1354                         /* yep, we lost a stream or two */
1355                         SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
1356                 } else {
1357                         /* no streams lost */
1358                         stcb->asoc.total_output_queue_size = 0;
1359                 }
1360         }
1361         /* Check to see if some data queued, if so report it */
1362         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1363                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
1364                         TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
1365                                 if (sp->msg_is_complete)
1366                                         being_filled++;
1367                                 chks_in_queue++;
1368                         }
1369                 }
1370         }
1371         if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
1372                 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
1373                     stcb->asoc.stream_queue_cnt, chks_in_queue);
1374         }
1375         if (chks_in_queue) {
1376                 /* call the output queue function */
1377                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
1378                 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1379                     (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1380                         /*
1381                          * Probably should go in and make it go back through
1382                          * and add fragments allowed
1383                          */
1384                         if (being_filled == 0) {
1385                                 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
1386                                     chks_in_queue);
1387                         }
1388                 }
1389         } else {
1390                 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
1391                     (u_long)stcb->asoc.total_output_queue_size);
1392                 stcb->asoc.total_output_queue_size = 0;
1393         }
1394 }
1395
1396 int
1397 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
1398     struct sctp_nets *net)
1399 {
1400         uint8_t net_was_pf;
1401
1402         if (net->dest_state & SCTP_ADDR_PF) {
1403                 net_was_pf = 1;
1404         } else {
1405                 net_was_pf = 0;
1406         }
1407         if (net->hb_responded == 0) {
1408                 if (net->ro._s_addr) {
1409                         /*
1410                          * Invalidate the src address if we did not get a
1411                          * response last time.
1412                          */
1413                         sctp_free_ifa(net->ro._s_addr);
1414                         net->ro._s_addr = NULL;
1415                         net->src_addr_selected = 0;
1416                 }
1417                 sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
1418                 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
1419                         /* Assoc is over */
1420                         return (1);
1421                 }
1422         }
1423         /* Zero PBA, if it needs it */
1424         if (net->partial_bytes_acked) {
1425                 net->partial_bytes_acked = 0;
1426         }
1427         if ((stcb->asoc.total_output_queue_size > 0) &&
1428             (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
1429             (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
1430                 sctp_audit_stream_queues_for_size(inp, stcb);
1431         }
1432         if (!(net->dest_state & SCTP_ADDR_NOHB) &&
1433             !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
1434                 /*
1435                  * when move to PF during threshold mangement, a HB has been
1436                  * queued in that routine
1437                  */
1438                 uint32_t ms_gone_by;
1439
1440                 if ((net->last_sent_time.tv_sec > 0) ||
1441                     (net->last_sent_time.tv_usec > 0)) {
1442                         struct timeval diff;
1443
1444                         SCTP_GETTIME_TIMEVAL(&diff);
1445                         timevalsub(&diff, &net->last_sent_time);
1446                         ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
1447                             (uint32_t)(diff.tv_usec / 1000);
1448                 } else {
1449                         ms_gone_by = 0xffffffff;
1450                 }
1451                 if ((ms_gone_by >= net->heart_beat_delay) ||
1452                     (net->dest_state & SCTP_ADDR_PF)) {
1453                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
1454                 }
1455         }
1456         return (0);
1457 }
1458
1459 void
1460 sctp_pathmtu_timer(struct sctp_inpcb *inp,
1461     struct sctp_tcb *stcb,
1462     struct sctp_nets *net)
1463 {
1464         uint32_t next_mtu, mtu;
1465
1466         next_mtu = sctp_get_next_mtu(net->mtu);
1467
1468         if ((next_mtu > net->mtu) && (net->port == 0)) {
1469                 if ((net->src_addr_selected == 0) ||
1470                     (net->ro._s_addr == NULL) ||
1471                     (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1472                         if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
1473                                 sctp_free_ifa(net->ro._s_addr);
1474                                 net->ro._s_addr = NULL;
1475                                 net->src_addr_selected = 0;
1476                         } else if (net->ro._s_addr == NULL) {
1477 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1478                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1479                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1480
1481                                         /* KAME hack: embed scopeid */
1482                                         (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
1483                                 }
1484 #endif
1485
1486                                 net->ro._s_addr = sctp_source_address_selection(inp,
1487                                     stcb,
1488                                     (sctp_route_t *)&net->ro,
1489                                     net, 0, stcb->asoc.vrf_id);
1490 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
1491                                 if (net->ro._l_addr.sa.sa_family == AF_INET6) {
1492                                         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1493
1494                                         (void)sa6_recoverscope(sin6);
1495                                 }
1496 #endif                          /* INET6 */
1497                         }
1498                         if (net->ro._s_addr)
1499                                 net->src_addr_selected = 1;
1500                 }
1501                 if (net->ro._s_addr) {
1502                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
1503 #if defined(INET) || defined(INET6)
1504                         if (net->port) {
1505                                 mtu -= sizeof(struct udphdr);
1506                         }
1507 #endif
1508                         if (mtu > next_mtu) {
1509                                 net->mtu = next_mtu;
1510                         } else {
1511                                 net->mtu = mtu;
1512                         }
1513                 }
1514         }
1515         /* restart the timer */
1516         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
1517 }
1518
1519 void
1520 sctp_autoclose_timer(struct sctp_inpcb *inp,
1521     struct sctp_tcb *stcb,
1522     struct sctp_nets *net)
1523 {
1524         struct timeval tn, *tim_touse;
1525         struct sctp_association *asoc;
1526         int ticks_gone_by;
1527
1528         (void)SCTP_GETTIME_TIMEVAL(&tn);
1529         if (stcb->asoc.sctp_autoclose_ticks &&
1530             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1531                 /* Auto close is on */
1532                 asoc = &stcb->asoc;
1533                 /* pick the time to use */
1534                 if (asoc->time_last_rcvd.tv_sec >
1535                     asoc->time_last_sent.tv_sec) {
1536                         tim_touse = &asoc->time_last_rcvd;
1537                 } else {
1538                         tim_touse = &asoc->time_last_sent;
1539                 }
1540                 /* Now has long enough transpired to autoclose? */
1541                 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
1542                 if ((ticks_gone_by > 0) &&
1543                     (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
1544                         /*
1545                          * autoclose time has hit, call the output routine,
1546                          * which should do nothing just to be SURE we don't
1547                          * have hanging data. We can then safely check the
1548                          * queues and know that we are clear to send
1549                          * shutdown
1550                          */
1551                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
1552                         /* Are we clean? */
1553                         if (TAILQ_EMPTY(&asoc->send_queue) &&
1554                             TAILQ_EMPTY(&asoc->sent_queue)) {
1555                                 /*
1556                                  * there is nothing queued to send, so I'm
1557                                  * done...
1558                                  */
1559                                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1560                                         /* only send SHUTDOWN 1st time thru */
1561                                         struct sctp_nets *netp;
1562
1563                                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
1564                                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1565                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1566                                         }
1567                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
1568                                         SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
1569                                         sctp_stop_timers_for_shutdown(stcb);
1570                                         if (stcb->asoc.alternate) {
1571                                                 netp = stcb->asoc.alternate;
1572                                         } else {
1573                                                 netp = stcb->asoc.primary_destination;
1574                                         }
1575                                         sctp_send_shutdown(stcb, netp);
1576                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
1577                                             stcb->sctp_ep, stcb,
1578                                             netp);
1579                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1580                                             stcb->sctp_ep, stcb,
1581                                             netp);
1582                                 }
1583                         }
1584                 } else {
1585                         /*
1586                          * No auto close at this time, reset t-o to check
1587                          * later
1588                          */
1589                         int tmp;
1590
1591                         /* fool the timer startup to use the time left */
1592                         tmp = asoc->sctp_autoclose_ticks;
1593                         asoc->sctp_autoclose_ticks -= ticks_gone_by;
1594                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1595                             net);
1596                         /* restore the real tick value */
1597                         asoc->sctp_autoclose_ticks = tmp;
1598                 }
1599         }
1600 }