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sys/netinet/sctp_timer.c
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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: releng/10.1/sys/netinet/sctp_timer.c 270357 2014-08-22 20:01:35Z tuexen $"); 35 36 #define _IP_VHL 37 #include <netinet/sctp_os.h> 38 #include <netinet/sctp_pcb.h> 39 #ifdef INET6 40 #endif 41 #include <netinet/sctp_var.h> 42 #include <netinet/sctp_sysctl.h> 43 #include <netinet/sctp_timer.h> 44 #include <netinet/sctputil.h> 45 #include <netinet/sctp_output.h> 46 #include <netinet/sctp_header.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_input.h> 50 #include <netinet/sctp.h> 51 #include <netinet/sctp_uio.h> 52 #if defined(INET) || defined(INET6) 53 #include <netinet/udp.h> 54 #endif 55 56 57 void 58 sctp_audit_retranmission_queue(struct sctp_association *asoc) 59 { 60 struct sctp_tmit_chunk *chk; 61 62 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n", 63 asoc->sent_queue_retran_cnt, 64 asoc->sent_queue_cnt); 65 asoc->sent_queue_retran_cnt = 0; 66 asoc->sent_queue_cnt = 0; 67 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 68 if (chk->sent == SCTP_DATAGRAM_RESEND) { 69 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 70 } 71 asoc->sent_queue_cnt++; 72 } 73 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) { 74 if (chk->sent == SCTP_DATAGRAM_RESEND) { 75 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 76 } 77 } 78 TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) { 79 if (chk->sent == SCTP_DATAGRAM_RESEND) { 80 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 81 } 82 } 83 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n", 84 asoc->sent_queue_retran_cnt, 85 asoc->sent_queue_cnt); 86 } 87 88 int 89 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 90 struct sctp_nets *net, uint16_t threshold) 91 { 92 if (net) { 93 net->error_count++; 94 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n", 95 (void *)net, net->error_count, 96 net->failure_threshold); 97 if (net->error_count > net->failure_threshold) { 98 /* We had a threshold failure */ 99 if (net->dest_state & SCTP_ADDR_REACHABLE) { 100 net->dest_state &= ~SCTP_ADDR_REACHABLE; 101 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 102 net->dest_state &= ~SCTP_ADDR_PF; 103 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 104 stcb, 0, 105 (void *)net, SCTP_SO_NOT_LOCKED); 106 } 107 } else if ((net->pf_threshold < net->failure_threshold) && 108 (net->error_count > net->pf_threshold)) { 109 if (!(net->dest_state & SCTP_ADDR_PF)) { 110 net->dest_state |= SCTP_ADDR_PF; 111 net->last_active = sctp_get_tick_count(); 112 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 113 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3); 114 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 115 } 116 } 117 } 118 if (stcb == NULL) 119 return (0); 120 121 if (net) { 122 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) { 123 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 124 sctp_misc_ints(SCTP_THRESHOLD_INCR, 125 stcb->asoc.overall_error_count, 126 (stcb->asoc.overall_error_count + 1), 127 SCTP_FROM_SCTP_TIMER, 128 __LINE__); 129 } 130 stcb->asoc.overall_error_count++; 131 } 132 } else { 133 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 134 sctp_misc_ints(SCTP_THRESHOLD_INCR, 135 stcb->asoc.overall_error_count, 136 (stcb->asoc.overall_error_count + 1), 137 SCTP_FROM_SCTP_TIMER, 138 __LINE__); 139 } 140 stcb->asoc.overall_error_count++; 141 } 142 SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n", 143 (void *)&stcb->asoc, stcb->asoc.overall_error_count, 144 (uint32_t) threshold, 145 ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state)); 146 /* 147 * We specifically do not do >= to give the assoc one more change 148 * before we fail it. 149 */ 150 if (stcb->asoc.overall_error_count > threshold) { 151 /* Abort notification sends a ULP notify */ 152 struct mbuf *op_err; 153 154 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, 155 "Association error couter exceeded"); 156 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_1; 157 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 158 return (1); 159 } 160 return (0); 161 } 162 163 /* 164 * sctp_find_alternate_net() returns a non-NULL pointer as long 165 * the argument net is non-NULL. 166 */ 167 struct sctp_nets * 168 sctp_find_alternate_net(struct sctp_tcb *stcb, 169 struct sctp_nets *net, 170 int mode) 171 { 172 /* Find and return an alternate network if possible */ 173 struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL; 174 int once; 175 176 /* JRS 5/14/07 - Initialize min_errors to an impossible value. */ 177 int min_errors = -1; 178 uint32_t max_cwnd = 0; 179 180 if (stcb->asoc.numnets == 1) { 181 /* No others but net */ 182 return (TAILQ_FIRST(&stcb->asoc.nets)); 183 } 184 /* 185 * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate 186 * net algorithm. This algorithm chooses the active destination (not 187 * in PF state) with the largest cwnd value. If all destinations are 188 * in PF state, unreachable, or unconfirmed, choose the desination 189 * that is in PF state with the lowest error count. In case of a 190 * tie, choose the destination that was most recently active. 191 */ 192 if (mode == 2) { 193 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) { 194 /* 195 * JRS 5/14/07 - If the destination is unreachable 196 * or unconfirmed, skip it. 197 */ 198 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) || 199 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) { 200 continue; 201 } 202 /* 203 * JRS 5/14/07 - If the destination is reachable 204 * but in PF state, compare the error count of the 205 * destination to the minimum error count seen thus 206 * far. Store the destination with the lower error 207 * count. If the error counts are equal, store the 208 * destination that was most recently active. 209 */ 210 if (mnet->dest_state & SCTP_ADDR_PF) { 211 /* 212 * JRS 5/14/07 - If the destination under 213 * consideration is the current destination, 214 * work as if the error count is one higher. 215 * The actual error count will not be 216 * incremented until later in the t3 217 * handler. 218 */ 219 if (mnet == net) { 220 if (min_errors == -1) { 221 min_errors = mnet->error_count + 1; 222 min_errors_net = mnet; 223 } else if (mnet->error_count + 1 < min_errors) { 224 min_errors = mnet->error_count + 1; 225 min_errors_net = mnet; 226 } else if (mnet->error_count + 1 == min_errors 227 && mnet->last_active > min_errors_net->last_active) { 228 min_errors_net = mnet; 229 min_errors = mnet->error_count + 1; 230 } 231 continue; 232 } else { 233 if (min_errors == -1) { 234 min_errors = mnet->error_count; 235 min_errors_net = mnet; 236 } else if (mnet->error_count < min_errors) { 237 min_errors = mnet->error_count; 238 min_errors_net = mnet; 239 } else if (mnet->error_count == min_errors 240 && mnet->last_active > min_errors_net->last_active) { 241 min_errors_net = mnet; 242 min_errors = mnet->error_count; 243 } 244 continue; 245 } 246 } 247 /* 248 * JRS 5/14/07 - If the destination is reachable and 249 * not in PF state, compare the cwnd of the 250 * destination to the highest cwnd seen thus far. 251 * Store the destination with the higher cwnd value. 252 * If the cwnd values are equal, randomly choose one 253 * of the two destinations. 254 */ 255 if (max_cwnd < mnet->cwnd) { 256 max_cwnd_net = mnet; 257 max_cwnd = mnet->cwnd; 258 } else if (max_cwnd == mnet->cwnd) { 259 uint32_t rndval; 260 uint8_t this_random; 261 262 if (stcb->asoc.hb_random_idx > 3) { 263 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep); 264 memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values)); 265 this_random = stcb->asoc.hb_random_values[0]; 266 stcb->asoc.hb_random_idx++; 267 stcb->asoc.hb_ect_randombit = 0; 268 } else { 269 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx]; 270 stcb->asoc.hb_random_idx++; 271 stcb->asoc.hb_ect_randombit = 0; 272 } 273 if (this_random % 2 == 1) { 274 max_cwnd_net = mnet; 275 max_cwnd = mnet->cwnd; /* Useless? */ 276 } 277 } 278 } 279 if (max_cwnd_net == NULL) { 280 if (min_errors_net == NULL) { 281 return (net); 282 } 283 return (min_errors_net); 284 } else { 285 return (max_cwnd_net); 286 } 287 } 288 /* 289 * JRS 5/14/07 - If mode is set to 1, use the CMT policy for 290 * choosing an alternate net. 291 */ 292 else if (mode == 1) { 293 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) { 294 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) || 295 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) { 296 /* 297 * will skip ones that are not-reachable or 298 * unconfirmed 299 */ 300 continue; 301 } 302 if (max_cwnd < mnet->cwnd) { 303 max_cwnd_net = mnet; 304 max_cwnd = mnet->cwnd; 305 } else if (max_cwnd == mnet->cwnd) { 306 uint32_t rndval; 307 uint8_t this_random; 308 309 if (stcb->asoc.hb_random_idx > 3) { 310 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep); 311 memcpy(stcb->asoc.hb_random_values, &rndval, 312 sizeof(stcb->asoc.hb_random_values)); 313 this_random = stcb->asoc.hb_random_values[0]; 314 stcb->asoc.hb_random_idx = 0; 315 stcb->asoc.hb_ect_randombit = 0; 316 } else { 317 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx]; 318 stcb->asoc.hb_random_idx++; 319 stcb->asoc.hb_ect_randombit = 0; 320 } 321 if (this_random % 2) { 322 max_cwnd_net = mnet; 323 max_cwnd = mnet->cwnd; 324 } 325 } 326 } 327 if (max_cwnd_net) { 328 return (max_cwnd_net); 329 } 330 } 331 mnet = net; 332 once = 0; 333 334 if (mnet == NULL) { 335 mnet = TAILQ_FIRST(&stcb->asoc.nets); 336 if (mnet == NULL) { 337 return (NULL); 338 } 339 } 340 do { 341 alt = TAILQ_NEXT(mnet, sctp_next); 342 if (alt == NULL) { 343 once++; 344 if (once > 1) { 345 break; 346 } 347 alt = TAILQ_FIRST(&stcb->asoc.nets); 348 if (alt == NULL) { 349 return (NULL); 350 } 351 } 352 if (alt->ro.ro_rt == NULL) { 353 if (alt->ro._s_addr) { 354 sctp_free_ifa(alt->ro._s_addr); 355 alt->ro._s_addr = NULL; 356 } 357 alt->src_addr_selected = 0; 358 } 359 /* sa_ignore NO_NULL_CHK */ 360 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) && 361 (alt->ro.ro_rt != NULL) && 362 (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) { 363 /* Found a reachable address */ 364 break; 365 } 366 mnet = alt; 367 } while (alt != NULL); 368 369 if (alt == NULL) { 370 /* Case where NO insv network exists (dormant state) */ 371 /* we rotate destinations */ 372 once = 0; 373 mnet = net; 374 do { 375 if (mnet == NULL) { 376 return (TAILQ_FIRST(&stcb->asoc.nets)); 377 } 378 alt = TAILQ_NEXT(mnet, sctp_next); 379 if (alt == NULL) { 380 once++; 381 if (once > 1) { 382 break; 383 } 384 alt = TAILQ_FIRST(&stcb->asoc.nets); 385 } 386 /* sa_ignore NO_NULL_CHK */ 387 if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) && 388 (alt != net)) { 389 /* Found an alternate address */ 390 break; 391 } 392 mnet = alt; 393 } while (alt != NULL); 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 net->RTO = stcb->asoc.minrto; 409 } 410 net->RTO <<= 1; 411 if (net->RTO > stcb->asoc.maxrto) { 412 net->RTO = stcb->asoc.maxrto; 413 } 414 if ((win_probe == 0) && (num_marked || num_abandoned)) { 415 /* We don't apply penalty to window probe scenarios */ 416 /* JRS - Use the congestion control given in the CC module */ 417 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net); 418 } 419 } 420 421 #ifndef INVARIANTS 422 static void 423 sctp_recover_sent_list(struct sctp_tcb *stcb) 424 { 425 struct sctp_tmit_chunk *chk, *nchk; 426 struct sctp_association *asoc; 427 428 asoc = &stcb->asoc; 429 TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) { 430 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) { 431 SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n", 432 (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq); 433 if (chk->sent != SCTP_DATAGRAM_NR_ACKED) { 434 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 435 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 436 } 437 } 438 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next); 439 if (PR_SCTP_ENABLED(chk->flags)) { 440 if (asoc->pr_sctp_cnt != 0) 441 asoc->pr_sctp_cnt--; 442 } 443 if (chk->data) { 444 /* sa_ignore NO_NULL_CHK */ 445 sctp_free_bufspace(stcb, asoc, chk, 1); 446 sctp_m_freem(chk->data); 447 chk->data = NULL; 448 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) { 449 asoc->sent_queue_cnt_removeable--; 450 } 451 } 452 asoc->sent_queue_cnt--; 453 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 454 } 455 } 456 SCTP_PRINTF("after recover order is as follows\n"); 457 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 458 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq); 459 } 460 } 461 462 #endif 463 464 static int 465 sctp_mark_all_for_resend(struct sctp_tcb *stcb, 466 struct sctp_nets *net, 467 struct sctp_nets *alt, 468 int window_probe, 469 int *num_marked, 470 int *num_abandoned) 471 { 472 473 /* 474 * Mark all chunks (well not all) that were sent to *net for 475 * retransmission. Move them to alt for there destination as well... 476 * We only mark chunks that have been outstanding long enough to 477 * have received feed-back. 478 */ 479 struct sctp_tmit_chunk *chk, *nchk; 480 struct sctp_nets *lnets; 481 struct timeval now, min_wait, tv; 482 int cur_rto; 483 int cnt_abandoned; 484 int audit_tf, num_mk, fir; 485 unsigned int cnt_mk; 486 uint32_t orig_flight, orig_tf; 487 uint32_t tsnlast, tsnfirst; 488 int recovery_cnt = 0; 489 490 491 /* none in flight now */ 492 audit_tf = 0; 493 fir = 0; 494 /* 495 * figure out how long a data chunk must be pending before we can 496 * mark it .. 497 */ 498 (void)SCTP_GETTIME_TIMEVAL(&now); 499 /* get cur rto in micro-seconds */ 500 cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 501 cur_rto *= 1000; 502 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 503 sctp_log_fr(cur_rto, 504 stcb->asoc.peers_rwnd, 505 window_probe, 506 SCTP_FR_T3_MARK_TIME); 507 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT); 508 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT); 509 } 510 tv.tv_sec = cur_rto / 1000000; 511 tv.tv_usec = cur_rto % 1000000; 512 min_wait = now; 513 timevalsub(&min_wait, &tv); 514 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) { 515 /* 516 * if we hit here, we don't have enough seconds on the clock 517 * to account for the RTO. We just let the lower seconds be 518 * the bounds and don't worry about it. This may mean we 519 * will mark a lot more than we should. 520 */ 521 min_wait.tv_sec = min_wait.tv_usec = 0; 522 } 523 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 524 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME); 525 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME); 526 } 527 /* 528 * Our rwnd will be incorrect here since we are not adding back the 529 * cnt * mbuf but we will fix that down below. 530 */ 531 orig_flight = net->flight_size; 532 orig_tf = stcb->asoc.total_flight; 533 534 net->fast_retran_ip = 0; 535 /* Now on to each chunk */ 536 cnt_abandoned = 0; 537 num_mk = cnt_mk = 0; 538 tsnfirst = tsnlast = 0; 539 #ifndef INVARIANTS 540 start_again: 541 #endif 542 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) { 543 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) { 544 /* Strange case our list got out of order? */ 545 SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n", 546 (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq); 547 recovery_cnt++; 548 #ifdef INVARIANTS 549 panic("last acked >= chk on sent-Q"); 550 #else 551 SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt); 552 sctp_recover_sent_list(stcb); 553 if (recovery_cnt < 10) { 554 goto start_again; 555 } else { 556 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt); 557 } 558 #endif 559 } 560 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) { 561 /* 562 * found one to mark: If it is less than 563 * DATAGRAM_ACKED it MUST not be a skipped or marked 564 * TSN but instead one that is either already set 565 * for retransmission OR one that needs 566 * retransmission. 567 */ 568 569 /* validate its been outstanding long enough */ 570 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 571 sctp_log_fr(chk->rec.data.TSN_seq, 572 chk->sent_rcv_time.tv_sec, 573 chk->sent_rcv_time.tv_usec, 574 SCTP_FR_T3_MARK_TIME); 575 } 576 if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) { 577 /* 578 * we have reached a chunk that was sent 579 * some seconds past our min.. forget it we 580 * will find no more to send. 581 */ 582 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 583 sctp_log_fr(0, 584 chk->sent_rcv_time.tv_sec, 585 chk->sent_rcv_time.tv_usec, 586 SCTP_FR_T3_STOPPED); 587 } 588 continue; 589 } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) && 590 (window_probe == 0)) { 591 /* 592 * we must look at the micro seconds to 593 * know. 594 */ 595 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) { 596 /* 597 * ok it was sent after our boundary 598 * time. 599 */ 600 continue; 601 } 602 } 603 if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) { 604 /* Is it expired? */ 605 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) { 606 /* Yes so drop it */ 607 if (chk->data) { 608 (void)sctp_release_pr_sctp_chunk(stcb, 609 chk, 610 1, 611 SCTP_SO_NOT_LOCKED); 612 cnt_abandoned++; 613 } 614 continue; 615 } 616 } 617 if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) { 618 /* Has it been retransmitted tv_sec times? */ 619 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) { 620 if (chk->data) { 621 (void)sctp_release_pr_sctp_chunk(stcb, 622 chk, 623 1, 624 SCTP_SO_NOT_LOCKED); 625 cnt_abandoned++; 626 } 627 continue; 628 } 629 } 630 if (chk->sent < SCTP_DATAGRAM_RESEND) { 631 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 632 num_mk++; 633 if (fir == 0) { 634 fir = 1; 635 tsnfirst = chk->rec.data.TSN_seq; 636 } 637 tsnlast = chk->rec.data.TSN_seq; 638 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 639 sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count, 640 0, SCTP_FR_T3_MARKED); 641 } 642 if (chk->rec.data.chunk_was_revoked) { 643 /* deflate the cwnd */ 644 chk->whoTo->cwnd -= chk->book_size; 645 chk->rec.data.chunk_was_revoked = 0; 646 } 647 net->marked_retrans++; 648 stcb->asoc.marked_retrans++; 649 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 650 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO, 651 chk->whoTo->flight_size, 652 chk->book_size, 653 (uintptr_t) chk->whoTo, 654 chk->rec.data.TSN_seq); 655 } 656 sctp_flight_size_decrease(chk); 657 sctp_total_flight_decrease(stcb, chk); 658 stcb->asoc.peers_rwnd += chk->send_size; 659 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh); 660 } 661 chk->sent = SCTP_DATAGRAM_RESEND; 662 SCTP_STAT_INCR(sctps_markedretrans); 663 664 /* reset the TSN for striking and other FR stuff */ 665 chk->rec.data.doing_fast_retransmit = 0; 666 /* Clear any time so NO RTT is being done */ 667 668 if (chk->do_rtt) { 669 if (chk->whoTo->rto_needed == 0) { 670 chk->whoTo->rto_needed = 1; 671 } 672 } 673 chk->do_rtt = 0; 674 if (alt != net) { 675 sctp_free_remote_addr(chk->whoTo); 676 chk->no_fr_allowed = 1; 677 chk->whoTo = alt; 678 atomic_add_int(&alt->ref_count, 1); 679 } else { 680 chk->no_fr_allowed = 0; 681 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 682 chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 683 } else { 684 chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 685 } 686 } 687 /* 688 * CMT: Do not allow FRs on retransmitted TSNs. 689 */ 690 if (stcb->asoc.sctp_cmt_on_off > 0) { 691 chk->no_fr_allowed = 1; 692 } 693 #ifdef THIS_SHOULD_NOT_BE_DONE 694 } else if (chk->sent == SCTP_DATAGRAM_ACKED) { 695 /* remember highest acked one */ 696 could_be_sent = chk; 697 #endif 698 } 699 if (chk->sent == SCTP_DATAGRAM_RESEND) { 700 cnt_mk++; 701 } 702 } 703 if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) { 704 /* we did not subtract the same things? */ 705 audit_tf = 1; 706 } 707 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 708 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT); 709 } 710 #ifdef SCTP_DEBUG 711 if (num_mk) { 712 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n", 713 tsnlast); 714 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n", 715 num_mk, (u_long)stcb->asoc.peers_rwnd); 716 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n", 717 tsnlast); 718 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n", 719 num_mk, 720 (int)stcb->asoc.peers_rwnd); 721 } 722 #endif 723 *num_marked = num_mk; 724 *num_abandoned = cnt_abandoned; 725 /* 726 * Now check for a ECN Echo that may be stranded And include the 727 * cnt_mk'd to have all resends in the control queue. 728 */ 729 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 730 if (chk->sent == SCTP_DATAGRAM_RESEND) { 731 cnt_mk++; 732 } 733 if ((chk->whoTo == net) && 734 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 735 sctp_free_remote_addr(chk->whoTo); 736 chk->whoTo = alt; 737 if (chk->sent != SCTP_DATAGRAM_RESEND) { 738 chk->sent = SCTP_DATAGRAM_RESEND; 739 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 740 cnt_mk++; 741 } 742 atomic_add_int(&alt->ref_count, 1); 743 } 744 } 745 #ifdef THIS_SHOULD_NOT_BE_DONE 746 if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) { 747 /* fix it so we retransmit the highest acked anyway */ 748 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 749 cnt_mk++; 750 could_be_sent->sent = SCTP_DATAGRAM_RESEND; 751 } 752 #endif 753 if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) { 754 #ifdef INVARIANTS 755 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n", 756 cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk); 757 #endif 758 #ifndef SCTP_AUDITING_ENABLED 759 stcb->asoc.sent_queue_retran_cnt = cnt_mk; 760 #endif 761 } 762 if (audit_tf) { 763 SCTPDBG(SCTP_DEBUG_TIMER4, 764 "Audit total flight due to negative value net:%p\n", 765 (void *)net); 766 stcb->asoc.total_flight = 0; 767 stcb->asoc.total_flight_count = 0; 768 /* Clear all networks flight size */ 769 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) { 770 lnets->flight_size = 0; 771 SCTPDBG(SCTP_DEBUG_TIMER4, 772 "Net:%p c-f cwnd:%d ssthresh:%d\n", 773 (void *)lnets, lnets->cwnd, lnets->ssthresh); 774 } 775 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 776 if (chk->sent < SCTP_DATAGRAM_RESEND) { 777 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 778 sctp_misc_ints(SCTP_FLIGHT_LOG_UP, 779 chk->whoTo->flight_size, 780 chk->book_size, 781 (uintptr_t) chk->whoTo, 782 chk->rec.data.TSN_seq); 783 } 784 sctp_flight_size_increase(chk); 785 sctp_total_flight_increase(stcb, chk); 786 } 787 } 788 } 789 /* We return 1 if we only have a window probe outstanding */ 790 return (0); 791 } 792 793 794 int 795 sctp_t3rxt_timer(struct sctp_inpcb *inp, 796 struct sctp_tcb *stcb, 797 struct sctp_nets *net) 798 { 799 struct sctp_nets *alt; 800 int win_probe, num_mk, num_abandoned; 801 802 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 803 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT); 804 } 805 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 806 struct sctp_nets *lnet; 807 808 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) { 809 if (net == lnet) { 810 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3); 811 } else { 812 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3); 813 } 814 } 815 } 816 /* Find an alternate and mark those for retransmission */ 817 if ((stcb->asoc.peers_rwnd == 0) && 818 (stcb->asoc.total_flight < net->mtu)) { 819 SCTP_STAT_INCR(sctps_timowindowprobe); 820 win_probe = 1; 821 } else { 822 win_probe = 0; 823 } 824 825 if (win_probe == 0) { 826 /* We don't do normal threshold management on window probes */ 827 if (sctp_threshold_management(inp, stcb, net, 828 stcb->asoc.max_send_times)) { 829 /* Association was destroyed */ 830 return (1); 831 } else { 832 if (net != stcb->asoc.primary_destination) { 833 /* send a immediate HB if our RTO is stale */ 834 struct timeval now; 835 unsigned int ms_goneby; 836 837 (void)SCTP_GETTIME_TIMEVAL(&now); 838 if (net->last_sent_time.tv_sec) { 839 ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000; 840 } else { 841 ms_goneby = 0; 842 } 843 if ((net->dest_state & SCTP_ADDR_PF) == 0) { 844 if ((ms_goneby > net->RTO) || (net->RTO == 0)) { 845 /* 846 * no recent feed back in an 847 * RTO or more, request a 848 * RTT update 849 */ 850 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 851 } 852 } 853 } 854 } 855 } else { 856 /* 857 * For a window probe we don't penalize the net's but only 858 * the association. This may fail it if SACKs are not coming 859 * back. If sack's are coming with rwnd locked at 0, we will 860 * continue to hold things waiting for rwnd to raise 861 */ 862 if (sctp_threshold_management(inp, stcb, NULL, 863 stcb->asoc.max_send_times)) { 864 /* Association was destroyed */ 865 return (1); 866 } 867 } 868 if (stcb->asoc.sctp_cmt_on_off > 0) { 869 if (net->pf_threshold < net->failure_threshold) { 870 alt = sctp_find_alternate_net(stcb, net, 2); 871 } else { 872 /* 873 * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is 874 * being used, then pick dest with largest ssthresh 875 * for any retransmission. 876 */ 877 alt = sctp_find_alternate_net(stcb, net, 1); 878 /* 879 * CUCv2: If a different dest is picked for the 880 * retransmission, then new (rtx-)pseudo_cumack 881 * needs to be tracked for orig dest. Let CUCv2 882 * track new (rtx-) pseudo-cumack always. 883 */ 884 net->find_pseudo_cumack = 1; 885 net->find_rtx_pseudo_cumack = 1; 886 } 887 } else { 888 alt = sctp_find_alternate_net(stcb, net, 0); 889 } 890 891 num_mk = 0; 892 num_abandoned = 0; 893 (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe, 894 &num_mk, &num_abandoned); 895 /* FR Loss recovery just ended with the T3. */ 896 stcb->asoc.fast_retran_loss_recovery = 0; 897 898 /* CMT FR loss recovery ended with the T3 */ 899 net->fast_retran_loss_recovery = 0; 900 if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) && 901 (net->flight_size == 0)) { 902 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net); 903 } 904 /* 905 * setup the sat loss recovery that prevents satellite cwnd advance. 906 */ 907 stcb->asoc.sat_t3_loss_recovery = 1; 908 stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq; 909 910 /* Backoff the timer and cwnd */ 911 sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned); 912 if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) || 913 (net->dest_state & SCTP_ADDR_PF)) { 914 /* Move all pending over too */ 915 sctp_move_chunks_from_net(stcb, net); 916 917 /* 918 * Get the address that failed, to force a new src address 919 * selecton and a route allocation. 920 */ 921 if (net->ro._s_addr) { 922 sctp_free_ifa(net->ro._s_addr); 923 net->ro._s_addr = NULL; 924 } 925 net->src_addr_selected = 0; 926 927 /* Force a route allocation too */ 928 if (net->ro.ro_rt) { 929 RTFREE(net->ro.ro_rt); 930 net->ro.ro_rt = NULL; 931 } 932 /* Was it our primary? */ 933 if ((stcb->asoc.primary_destination == net) && (alt != net)) { 934 /* 935 * Yes, note it as such and find an alternate note: 936 * this means HB code must use this to resent the 937 * primary if it goes active AND if someone does a 938 * change-primary then this flag must be cleared 939 * from any net structures. 940 */ 941 if (stcb->asoc.alternate) { 942 sctp_free_remote_addr(stcb->asoc.alternate); 943 } 944 stcb->asoc.alternate = alt; 945 atomic_add_int(&stcb->asoc.alternate->ref_count, 1); 946 } 947 } 948 /* 949 * Special case for cookie-echo'ed case, we don't do output but must 950 * await the COOKIE-ACK before retransmission 951 */ 952 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 953 /* 954 * Here we just reset the timer and start again since we 955 * have not established the asoc 956 */ 957 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net); 958 return (0); 959 } 960 if (stcb->asoc.prsctp_supported) { 961 struct sctp_tmit_chunk *lchk; 962 963 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc); 964 /* C3. See if we need to send a Fwd-TSN */ 965 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) { 966 send_forward_tsn(stcb, &stcb->asoc); 967 if (lchk) { 968 /* Assure a timer is up */ 969 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo); 970 } 971 } 972 } 973 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 974 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX); 975 } 976 return (0); 977 } 978 979 int 980 sctp_t1init_timer(struct sctp_inpcb *inp, 981 struct sctp_tcb *stcb, 982 struct sctp_nets *net) 983 { 984 /* bump the thresholds */ 985 if (stcb->asoc.delayed_connection) { 986 /* 987 * special hook for delayed connection. The library did NOT 988 * complete the rest of its sends. 989 */ 990 stcb->asoc.delayed_connection = 0; 991 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED); 992 return (0); 993 } 994 if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) { 995 return (0); 996 } 997 if (sctp_threshold_management(inp, stcb, net, 998 stcb->asoc.max_init_times)) { 999 /* Association was destroyed */ 1000 return (1); 1001 } 1002 stcb->asoc.dropped_special_cnt = 0; 1003 sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0); 1004 if (stcb->asoc.initial_init_rto_max < net->RTO) { 1005 net->RTO = stcb->asoc.initial_init_rto_max; 1006 } 1007 if (stcb->asoc.numnets > 1) { 1008 /* If we have more than one addr use it */ 1009 struct sctp_nets *alt; 1010 1011 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0); 1012 if (alt != stcb->asoc.primary_destination) { 1013 sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination); 1014 stcb->asoc.primary_destination = alt; 1015 } 1016 } 1017 /* Send out a new init */ 1018 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED); 1019 return (0); 1020 } 1021 1022 /* 1023 * For cookie and asconf we actually need to find and mark for resend, then 1024 * increment the resend counter (after all the threshold management stuff of 1025 * course). 1026 */ 1027 int 1028 sctp_cookie_timer(struct sctp_inpcb *inp, 1029 struct sctp_tcb *stcb, 1030 struct sctp_nets *net SCTP_UNUSED) 1031 { 1032 struct sctp_nets *alt; 1033 struct sctp_tmit_chunk *cookie; 1034 1035 /* first before all else we must find the cookie */ 1036 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) { 1037 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 1038 break; 1039 } 1040 } 1041 if (cookie == NULL) { 1042 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 1043 /* FOOBAR! */ 1044 struct mbuf *op_err; 1045 1046 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, 1047 "Cookie timer expired, but no cookie"); 1048 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4; 1049 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 1050 } else { 1051 #ifdef INVARIANTS 1052 panic("Cookie timer expires in wrong state?"); 1053 #else 1054 SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc)); 1055 return (0); 1056 #endif 1057 } 1058 return (0); 1059 } 1060 /* Ok we found the cookie, threshold management next */ 1061 if (sctp_threshold_management(inp, stcb, cookie->whoTo, 1062 stcb->asoc.max_init_times)) { 1063 /* Assoc is over */ 1064 return (1); 1065 } 1066 /* 1067 * cleared theshold management now lets backoff the address & select 1068 * an alternate 1069 */ 1070 stcb->asoc.dropped_special_cnt = 0; 1071 sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0); 1072 alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0); 1073 if (alt != cookie->whoTo) { 1074 sctp_free_remote_addr(cookie->whoTo); 1075 cookie->whoTo = alt; 1076 atomic_add_int(&alt->ref_count, 1); 1077 } 1078 /* Now mark the retran info */ 1079 if (cookie->sent != SCTP_DATAGRAM_RESEND) { 1080 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1081 } 1082 cookie->sent = SCTP_DATAGRAM_RESEND; 1083 /* 1084 * Now call the output routine to kick out the cookie again, Note we 1085 * don't mark any chunks for retran so that FR will need to kick in 1086 * to move these (or a send timer). 1087 */ 1088 return (0); 1089 } 1090 1091 int 1092 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1093 struct sctp_nets *net) 1094 { 1095 struct sctp_nets *alt; 1096 struct sctp_tmit_chunk *strrst = NULL, *chk = NULL; 1097 1098 if (stcb->asoc.stream_reset_outstanding == 0) { 1099 return (0); 1100 } 1101 /* find the existing STRRESET, we use the seq number we sent out on */ 1102 (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst); 1103 if (strrst == NULL) { 1104 return (0); 1105 } 1106 /* do threshold management */ 1107 if (sctp_threshold_management(inp, stcb, strrst->whoTo, 1108 stcb->asoc.max_send_times)) { 1109 /* Assoc is over */ 1110 return (1); 1111 } 1112 /* 1113 * cleared theshold management now lets backoff the address & select 1114 * an alternate 1115 */ 1116 sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0); 1117 alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0); 1118 sctp_free_remote_addr(strrst->whoTo); 1119 strrst->whoTo = alt; 1120 atomic_add_int(&alt->ref_count, 1); 1121 1122 /* See if a ECN Echo is also stranded */ 1123 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 1124 if ((chk->whoTo == net) && 1125 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 1126 sctp_free_remote_addr(chk->whoTo); 1127 if (chk->sent != SCTP_DATAGRAM_RESEND) { 1128 chk->sent = SCTP_DATAGRAM_RESEND; 1129 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1130 } 1131 chk->whoTo = alt; 1132 atomic_add_int(&alt->ref_count, 1); 1133 } 1134 } 1135 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 1136 /* 1137 * If the address went un-reachable, we need to move to 1138 * alternates for ALL chk's in queue 1139 */ 1140 sctp_move_chunks_from_net(stcb, net); 1141 } 1142 /* mark the retran info */ 1143 if (strrst->sent != SCTP_DATAGRAM_RESEND) 1144 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1145 strrst->sent = SCTP_DATAGRAM_RESEND; 1146 1147 /* restart the timer */ 1148 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo); 1149 return (0); 1150 } 1151 1152 int 1153 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1154 struct sctp_nets *net) 1155 { 1156 struct sctp_nets *alt; 1157 struct sctp_tmit_chunk *asconf, *chk; 1158 1159 /* is this a first send, or a retransmission? */ 1160 if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) { 1161 /* compose a new ASCONF chunk and send it */ 1162 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED); 1163 } else { 1164 /* 1165 * Retransmission of the existing ASCONF is needed 1166 */ 1167 1168 /* find the existing ASCONF */ 1169 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue); 1170 if (asconf == NULL) { 1171 return (0); 1172 } 1173 /* do threshold management */ 1174 if (sctp_threshold_management(inp, stcb, asconf->whoTo, 1175 stcb->asoc.max_send_times)) { 1176 /* Assoc is over */ 1177 return (1); 1178 } 1179 if (asconf->snd_count > stcb->asoc.max_send_times) { 1180 /* 1181 * Something is rotten: our peer is not responding 1182 * to ASCONFs but apparently is to other chunks. 1183 * i.e. it is not properly handling the chunk type 1184 * upper bits. Mark this peer as ASCONF incapable 1185 * and cleanup. 1186 */ 1187 SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n"); 1188 sctp_asconf_cleanup(stcb, net); 1189 return (0); 1190 } 1191 /* 1192 * cleared threshold management, so now backoff the net and 1193 * select an alternate 1194 */ 1195 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0); 1196 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0); 1197 if (asconf->whoTo != alt) { 1198 sctp_free_remote_addr(asconf->whoTo); 1199 asconf->whoTo = alt; 1200 atomic_add_int(&alt->ref_count, 1); 1201 } 1202 /* See if an ECN Echo is also stranded */ 1203 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 1204 if ((chk->whoTo == net) && 1205 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 1206 sctp_free_remote_addr(chk->whoTo); 1207 chk->whoTo = alt; 1208 if (chk->sent != SCTP_DATAGRAM_RESEND) { 1209 chk->sent = SCTP_DATAGRAM_RESEND; 1210 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1211 } 1212 atomic_add_int(&alt->ref_count, 1); 1213 } 1214 } 1215 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) { 1216 if (chk->whoTo != alt) { 1217 sctp_free_remote_addr(chk->whoTo); 1218 chk->whoTo = alt; 1219 atomic_add_int(&alt->ref_count, 1); 1220 } 1221 if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT) 1222 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1223 chk->sent = SCTP_DATAGRAM_RESEND; 1224 } 1225 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 1226 /* 1227 * If the address went un-reachable, we need to move 1228 * to the alternate for ALL chunks in queue 1229 */ 1230 sctp_move_chunks_from_net(stcb, net); 1231 } 1232 /* mark the retran info */ 1233 if (asconf->sent != SCTP_DATAGRAM_RESEND) 1234 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1235 asconf->sent = SCTP_DATAGRAM_RESEND; 1236 1237 /* send another ASCONF if any and we can do */ 1238 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED); 1239 } 1240 return (0); 1241 } 1242 1243 /* Mobility adaptation */ 1244 void 1245 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1246 struct sctp_nets *net SCTP_UNUSED) 1247 { 1248 if (stcb->asoc.deleted_primary == NULL) { 1249 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n"); 1250 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED); 1251 return; 1252 } 1253 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary "); 1254 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa); 1255 sctp_free_remote_addr(stcb->asoc.deleted_primary); 1256 stcb->asoc.deleted_primary = NULL; 1257 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED); 1258 return; 1259 } 1260 1261 /* 1262 * For the shutdown and shutdown-ack, we do not keep one around on the 1263 * control queue. This means we must generate a new one and call the general 1264 * chunk output routine, AFTER having done threshold management. 1265 * It is assumed that net is non-NULL. 1266 */ 1267 int 1268 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1269 struct sctp_nets *net) 1270 { 1271 struct sctp_nets *alt; 1272 1273 /* first threshold managment */ 1274 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) { 1275 /* Assoc is over */ 1276 return (1); 1277 } 1278 sctp_backoff_on_timeout(stcb, net, 1, 0, 0); 1279 /* second select an alternative */ 1280 alt = sctp_find_alternate_net(stcb, net, 0); 1281 1282 /* third generate a shutdown into the queue for out net */ 1283 sctp_send_shutdown(stcb, alt); 1284 1285 /* fourth restart timer */ 1286 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt); 1287 return (0); 1288 } 1289 1290 int 1291 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1292 struct sctp_nets *net) 1293 { 1294 struct sctp_nets *alt; 1295 1296 /* first threshold managment */ 1297 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) { 1298 /* Assoc is over */ 1299 return (1); 1300 } 1301 sctp_backoff_on_timeout(stcb, net, 1, 0, 0); 1302 /* second select an alternative */ 1303 alt = sctp_find_alternate_net(stcb, net, 0); 1304 1305 /* third generate a shutdown into the queue for out net */ 1306 sctp_send_shutdown_ack(stcb, alt); 1307 1308 /* fourth restart timer */ 1309 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt); 1310 return (0); 1311 } 1312 1313 static void 1314 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp, 1315 struct sctp_tcb *stcb) 1316 { 1317 struct sctp_stream_queue_pending *sp; 1318 unsigned int i, chks_in_queue = 0; 1319 int being_filled = 0; 1320 1321 /* 1322 * This function is ONLY called when the send/sent queues are empty. 1323 */ 1324 if ((stcb == NULL) || (inp == NULL)) 1325 return; 1326 1327 if (stcb->asoc.sent_queue_retran_cnt) { 1328 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n", 1329 stcb->asoc.sent_queue_retran_cnt); 1330 stcb->asoc.sent_queue_retran_cnt = 0; 1331 } 1332 if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) { 1333 /* No stream scheduler information, initialize scheduler */ 1334 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0); 1335 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) { 1336 /* yep, we lost a stream or two */ 1337 SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n"); 1338 } else { 1339 /* no streams lost */ 1340 stcb->asoc.total_output_queue_size = 0; 1341 } 1342 } 1343 /* Check to see if some data queued, if so report it */ 1344 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1345 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 1346 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) { 1347 if (sp->msg_is_complete) 1348 being_filled++; 1349 chks_in_queue++; 1350 } 1351 } 1352 } 1353 if (chks_in_queue != stcb->asoc.stream_queue_cnt) { 1354 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n", 1355 stcb->asoc.stream_queue_cnt, chks_in_queue); 1356 } 1357 if (chks_in_queue) { 1358 /* call the output queue function */ 1359 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED); 1360 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) && 1361 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 1362 /* 1363 * Probably should go in and make it go back through 1364 * and add fragments allowed 1365 */ 1366 if (being_filled == 0) { 1367 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n", 1368 chks_in_queue); 1369 } 1370 } 1371 } else { 1372 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n", 1373 (u_long)stcb->asoc.total_output_queue_size); 1374 stcb->asoc.total_output_queue_size = 0; 1375 } 1376 } 1377 1378 int 1379 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1380 struct sctp_nets *net) 1381 { 1382 uint8_t net_was_pf; 1383 1384 if (net->dest_state & SCTP_ADDR_PF) { 1385 net_was_pf = 1; 1386 } else { 1387 net_was_pf = 0; 1388 } 1389 if (net->hb_responded == 0) { 1390 if (net->ro._s_addr) { 1391 /* 1392 * Invalidate the src address if we did not get a 1393 * response last time. 1394 */ 1395 sctp_free_ifa(net->ro._s_addr); 1396 net->ro._s_addr = NULL; 1397 net->src_addr_selected = 0; 1398 } 1399 sctp_backoff_on_timeout(stcb, net, 1, 0, 0); 1400 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) { 1401 /* Assoc is over */ 1402 return (1); 1403 } 1404 } 1405 /* Zero PBA, if it needs it */ 1406 if (net->partial_bytes_acked) { 1407 net->partial_bytes_acked = 0; 1408 } 1409 if ((stcb->asoc.total_output_queue_size > 0) && 1410 (TAILQ_EMPTY(&stcb->asoc.send_queue)) && 1411 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 1412 sctp_audit_stream_queues_for_size(inp, stcb); 1413 } 1414 if (!(net->dest_state & SCTP_ADDR_NOHB) && 1415 !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) { 1416 /* 1417 * when move to PF during threshold mangement, a HB has been 1418 * queued in that routine 1419 */ 1420 uint32_t ms_gone_by; 1421 1422 if ((net->last_sent_time.tv_sec > 0) || 1423 (net->last_sent_time.tv_usec > 0)) { 1424 struct timeval diff; 1425 1426 SCTP_GETTIME_TIMEVAL(&diff); 1427 timevalsub(&diff, &net->last_sent_time); 1428 ms_gone_by = (uint32_t) (diff.tv_sec * 1000) + 1429 (uint32_t) (diff.tv_usec / 1000); 1430 } else { 1431 ms_gone_by = 0xffffffff; 1432 } 1433 if ((ms_gone_by >= net->heart_beat_delay) || 1434 (net->dest_state & SCTP_ADDR_PF)) { 1435 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 1436 } 1437 } 1438 return (0); 1439 } 1440 1441 void 1442 sctp_pathmtu_timer(struct sctp_inpcb *inp, 1443 struct sctp_tcb *stcb, 1444 struct sctp_nets *net) 1445 { 1446 uint32_t next_mtu, mtu; 1447 1448 next_mtu = sctp_get_next_mtu(net->mtu); 1449 1450 if ((next_mtu > net->mtu) && (net->port == 0)) { 1451 if ((net->src_addr_selected == 0) || 1452 (net->ro._s_addr == NULL) || 1453 (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) { 1454 if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) { 1455 sctp_free_ifa(net->ro._s_addr); 1456 net->ro._s_addr = NULL; 1457 net->src_addr_selected = 0; 1458 } else if (net->ro._s_addr == NULL) { 1459 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE) 1460 if (net->ro._l_addr.sa.sa_family == AF_INET6) { 1461 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1462 1463 /* KAME hack: embed scopeid */ 1464 (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)); 1465 } 1466 #endif 1467 1468 net->ro._s_addr = sctp_source_address_selection(inp, 1469 stcb, 1470 (sctp_route_t *) & net->ro, 1471 net, 0, stcb->asoc.vrf_id); 1472 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE) 1473 if (net->ro._l_addr.sa.sa_family == AF_INET6) { 1474 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1475 1476 (void)sa6_recoverscope(sin6); 1477 } 1478 #endif /* INET6 */ 1479 } 1480 if (net->ro._s_addr) 1481 net->src_addr_selected = 1; 1482 } 1483 if (net->ro._s_addr) { 1484 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt); 1485 #if defined(INET) || defined(INET6) 1486 if (net->port) { 1487 mtu -= sizeof(struct udphdr); 1488 } 1489 #endif 1490 if (mtu > next_mtu) { 1491 net->mtu = next_mtu; 1492 } 1493 } 1494 } 1495 /* restart the timer */ 1496 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net); 1497 } 1498 1499 void 1500 sctp_autoclose_timer(struct sctp_inpcb *inp, 1501 struct sctp_tcb *stcb, 1502 struct sctp_nets *net) 1503 { 1504 struct timeval tn, *tim_touse; 1505 struct sctp_association *asoc; 1506 int ticks_gone_by; 1507 1508 (void)SCTP_GETTIME_TIMEVAL(&tn); 1509 if (stcb->asoc.sctp_autoclose_ticks && 1510 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1511 /* Auto close is on */ 1512 asoc = &stcb->asoc; 1513 /* pick the time to use */ 1514 if (asoc->time_last_rcvd.tv_sec > 1515 asoc->time_last_sent.tv_sec) { 1516 tim_touse = &asoc->time_last_rcvd; 1517 } else { 1518 tim_touse = &asoc->time_last_sent; 1519 } 1520 /* Now has long enough transpired to autoclose? */ 1521 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec); 1522 if ((ticks_gone_by > 0) && 1523 (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) { 1524 /* 1525 * autoclose time has hit, call the output routine, 1526 * which should do nothing just to be SURE we don't 1527 * have hanging data. We can then safely check the 1528 * queues and know that we are clear to send 1529 * shutdown 1530 */ 1531 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED); 1532 /* Are we clean? */ 1533 if (TAILQ_EMPTY(&asoc->send_queue) && 1534 TAILQ_EMPTY(&asoc->sent_queue)) { 1535 /* 1536 * there is nothing queued to send, so I'm 1537 * done... 1538 */ 1539 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1540 /* only send SHUTDOWN 1st time thru */ 1541 struct sctp_nets *netp; 1542 1543 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 1544 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 1545 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 1546 } 1547 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 1548 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 1549 sctp_stop_timers_for_shutdown(stcb); 1550 if (stcb->asoc.alternate) { 1551 netp = stcb->asoc.alternate; 1552 } else { 1553 netp = stcb->asoc.primary_destination; 1554 } 1555 sctp_send_shutdown(stcb, netp); 1556 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 1557 stcb->sctp_ep, stcb, 1558 netp); 1559 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1560 stcb->sctp_ep, stcb, 1561 netp); 1562 } 1563 } 1564 } else { 1565 /* 1566 * No auto close at this time, reset t-o to check 1567 * later 1568 */ 1569 int tmp; 1570 1571 /* fool the timer startup to use the time left */ 1572 tmp = asoc->sctp_autoclose_ticks; 1573 asoc->sctp_autoclose_ticks -= ticks_gone_by; 1574 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1575 net); 1576 /* restore the real tick value */ 1577 asoc->sctp_autoclose_ticks = tmp; 1578 } 1579 } 1580 }
Cache object: 80df338860a637b7669783a6a2d3fe79
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