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