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