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 #ifdef __FreeBSD__ 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_timer.c 269448 2014-08-02 21:36:40Z tuexen $"); 36 #endif 37 38 #define _IP_VHL 39 #include <netinet/sctp_os.h> 40 #include <netinet/sctp_pcb.h> 41 #ifdef INET6 42 #if defined(__Userspace_os_FreeBSD) 43 #include <netinet6/sctp6_var.h> 44 #endif 45 #endif 46 #include <netinet/sctp_var.h> 47 #include <netinet/sctp_sysctl.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctputil.h> 50 #include <netinet/sctp_output.h> 51 #include <netinet/sctp_header.h> 52 #include <netinet/sctp_indata.h> 53 #include <netinet/sctp_asconf.h> 54 #include <netinet/sctp_input.h> 55 #include <netinet/sctp.h> 56 #include <netinet/sctp_uio.h> 57 #if defined(INET) || defined(INET6) 58 #if !defined(__Userspace_os_Windows) 59 #include <netinet/udp.h> 60 #endif 61 #endif 62 63 #if defined(__APPLE__) 64 #define APPLE_FILE_NO 6 65 #endif 66 67 void 68 sctp_audit_retranmission_queue(struct sctp_association *asoc) 69 { 70 struct sctp_tmit_chunk *chk; 71 72 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n", 73 asoc->sent_queue_retran_cnt, 74 asoc->sent_queue_cnt); 75 asoc->sent_queue_retran_cnt = 0; 76 asoc->sent_queue_cnt = 0; 77 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 78 if (chk->sent == SCTP_DATAGRAM_RESEND) { 79 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 80 } 81 asoc->sent_queue_cnt++; 82 } 83 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) { 84 if (chk->sent == SCTP_DATAGRAM_RESEND) { 85 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 86 } 87 } 88 TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) { 89 if (chk->sent == SCTP_DATAGRAM_RESEND) { 90 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 91 } 92 } 93 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n", 94 asoc->sent_queue_retran_cnt, 95 asoc->sent_queue_cnt); 96 } 97 98 int 99 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 100 struct sctp_nets *net, uint16_t threshold) 101 { 102 if (net) { 103 net->error_count++; 104 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n", 105 (void *)net, net->error_count, 106 net->failure_threshold); 107 if (net->error_count > net->failure_threshold) { 108 /* We had a threshold failure */ 109 if (net->dest_state & SCTP_ADDR_REACHABLE) { 110 net->dest_state &= ~SCTP_ADDR_REACHABLE; 111 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 112 net->dest_state &= ~SCTP_ADDR_PF; 113 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 114 stcb, 0, 115 (void *)net, SCTP_SO_NOT_LOCKED); 116 } 117 } else if ((net->pf_threshold < net->failure_threshold) && 118 (net->error_count > net->pf_threshold)) { 119 if (!(net->dest_state & SCTP_ADDR_PF)) { 120 net->dest_state |= SCTP_ADDR_PF; 121 net->last_active = sctp_get_tick_count(); 122 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 123 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3); 124 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 125 } 126 } 127 } 128 if (stcb == NULL) 129 return (0); 130 131 if (net) { 132 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) { 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 } else { 143 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 144 sctp_misc_ints(SCTP_THRESHOLD_INCR, 145 stcb->asoc.overall_error_count, 146 (stcb->asoc.overall_error_count+1), 147 SCTP_FROM_SCTP_TIMER, 148 __LINE__); 149 } 150 stcb->asoc.overall_error_count++; 151 } 152 SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n", 153 (void *)&stcb->asoc, stcb->asoc.overall_error_count, 154 (uint32_t)threshold, 155 ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state)); 156 /* 157 * We specifically do not do >= to give the assoc one more change 158 * before we fail it. 159 */ 160 if (stcb->asoc.overall_error_count > threshold) { 161 /* Abort notification sends a ULP notify */ 162 struct mbuf *op_err; 163 164 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, 165 "Association error couter exceeded"); 166 inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_1; 167 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 168 return (1); 169 } 170 return (0); 171 } 172 173 /* 174 * sctp_find_alternate_net() returns a non-NULL pointer as long 175 * the argument net is non-NULL. 176 */ 177 struct sctp_nets * 178 sctp_find_alternate_net(struct sctp_tcb *stcb, 179 struct sctp_nets *net, 180 int mode) 181 { 182 /* Find and return an alternate network if possible */ 183 struct sctp_nets *alt, *mnet, *min_errors_net = NULL , *max_cwnd_net = NULL; 184 int once; 185 /* JRS 5/14/07 - Initialize min_errors to an impossible value. */ 186 int min_errors = -1; 187 uint32_t max_cwnd = 0; 188 189 if (stcb->asoc.numnets == 1) { 190 /* No others but net */ 191 return (TAILQ_FIRST(&stcb->asoc.nets)); 192 } 193 /* 194 * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate net algorithm. 195 * This algorithm chooses the active destination (not in PF state) with the largest 196 * cwnd value. If all destinations are in PF state, unreachable, or unconfirmed, choose 197 * the desination that is in PF state with the lowest error count. In case of a tie, 198 * choose the destination that was most recently active. 199 */ 200 if (mode == 2) { 201 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) { 202 /* JRS 5/14/07 - If the destination is unreachable or unconfirmed, skip it. */ 203 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) || 204 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) { 205 continue; 206 } 207 /* 208 * JRS 5/14/07 - If the destination is reachable but in PF state, compare 209 * the error count of the destination to the minimum error count seen thus far. 210 * Store the destination with the lower error count. If the error counts are 211 * equal, store the destination that was most recently active. 212 */ 213 if (mnet->dest_state & SCTP_ADDR_PF) { 214 /* 215 * JRS 5/14/07 - If the destination under consideration is the current 216 * destination, work as if the error count is one higher. The 217 * actual error count will not be incremented until later in the 218 * t3 handler. 219 */ 220 if (mnet == net) { 221 if (min_errors == -1) { 222 min_errors = mnet->error_count + 1; 223 min_errors_net = mnet; 224 } else if (mnet->error_count + 1 < min_errors) { 225 min_errors = mnet->error_count + 1; 226 min_errors_net = mnet; 227 } else if (mnet->error_count + 1 == min_errors 228 && mnet->last_active > min_errors_net->last_active) { 229 min_errors_net = mnet; 230 min_errors = mnet->error_count + 1; 231 } 232 continue; 233 } else { 234 if (min_errors == -1) { 235 min_errors = mnet->error_count; 236 min_errors_net = mnet; 237 } else if (mnet->error_count < min_errors) { 238 min_errors = mnet->error_count; 239 min_errors_net = mnet; 240 } else if (mnet->error_count == min_errors 241 && mnet->last_active > min_errors_net->last_active) { 242 min_errors_net = mnet; 243 min_errors = mnet->error_count; 244 } 245 continue; 246 } 247 } 248 /* 249 * JRS 5/14/07 - If the destination is reachable and not in PF state, compare the 250 * cwnd of the destination to the highest cwnd seen thus far. Store the 251 * destination with the higher cwnd value. If the cwnd values are equal, 252 * randomly choose one of the two destinations. 253 */ 254 if (max_cwnd < mnet->cwnd) { 255 max_cwnd_net = mnet; 256 max_cwnd = mnet->cwnd; 257 } else if (max_cwnd == mnet->cwnd) { 258 uint32_t rndval; 259 uint8_t this_random; 260 261 if (stcb->asoc.hb_random_idx > 3) { 262 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep); 263 memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values)); 264 this_random = stcb->asoc.hb_random_values[0]; 265 stcb->asoc.hb_random_idx++; 266 stcb->asoc.hb_ect_randombit = 0; 267 } else { 268 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx]; 269 stcb->asoc.hb_random_idx++; 270 stcb->asoc.hb_ect_randombit = 0; 271 } 272 if (this_random % 2 == 1) { 273 max_cwnd_net = mnet; 274 max_cwnd = mnet->cwnd; /* Useless? */ 275 } 276 } 277 } 278 if (max_cwnd_net == NULL) { 279 if (min_errors_net == NULL) { 280 return (net); 281 } 282 return (min_errors_net); 283 } else { 284 return (max_cwnd_net); 285 } 286 } /* JRS 5/14/07 - If mode is set to 1, use the CMT policy for choosing an alternate net. */ 287 else if (mode == 1) { 288 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) { 289 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) || 290 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) { 291 /* 292 * will skip ones that are not-reachable or 293 * unconfirmed 294 */ 295 continue; 296 } 297 if (max_cwnd < mnet->cwnd) { 298 max_cwnd_net = mnet; 299 max_cwnd = mnet->cwnd; 300 } else if (max_cwnd == mnet->cwnd) { 301 uint32_t rndval; 302 uint8_t this_random; 303 304 if (stcb->asoc.hb_random_idx > 3) { 305 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep); 306 memcpy(stcb->asoc.hb_random_values, &rndval, 307 sizeof(stcb->asoc.hb_random_values)); 308 this_random = stcb->asoc.hb_random_values[0]; 309 stcb->asoc.hb_random_idx = 0; 310 stcb->asoc.hb_ect_randombit = 0; 311 } else { 312 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx]; 313 stcb->asoc.hb_random_idx++; 314 stcb->asoc.hb_ect_randombit = 0; 315 } 316 if (this_random % 2) { 317 max_cwnd_net = mnet; 318 max_cwnd = mnet->cwnd; 319 } 320 } 321 } 322 if (max_cwnd_net) { 323 return (max_cwnd_net); 324 } 325 } 326 mnet = net; 327 once = 0; 328 329 if (mnet == NULL) { 330 mnet = TAILQ_FIRST(&stcb->asoc.nets); 331 if (mnet == NULL) { 332 return (NULL); 333 } 334 } 335 do { 336 alt = TAILQ_NEXT(mnet, sctp_next); 337 if (alt == NULL) 338 { 339 once++; 340 if (once > 1) { 341 break; 342 } 343 alt = TAILQ_FIRST(&stcb->asoc.nets); 344 if (alt == NULL) { 345 return (NULL); 346 } 347 } 348 if (alt->ro.ro_rt == NULL) { 349 if (alt->ro._s_addr) { 350 sctp_free_ifa(alt->ro._s_addr); 351 alt->ro._s_addr = NULL; 352 } 353 alt->src_addr_selected = 0; 354 } 355 /*sa_ignore NO_NULL_CHK*/ 356 if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) && 357 (alt->ro.ro_rt != NULL) && 358 (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) { 359 /* Found a reachable address */ 360 break; 361 } 362 mnet = alt; 363 } while (alt != NULL); 364 365 if (alt == NULL) { 366 /* Case where NO insv network exists (dormant state) */ 367 /* we rotate destinations */ 368 once = 0; 369 mnet = net; 370 do { 371 if (mnet == NULL) { 372 return (TAILQ_FIRST(&stcb->asoc.nets)); 373 } 374 alt = TAILQ_NEXT(mnet, sctp_next); 375 if (alt == NULL) { 376 once++; 377 if (once > 1) { 378 break; 379 } 380 alt = TAILQ_FIRST(&stcb->asoc.nets); 381 } 382 /*sa_ignore NO_NULL_CHK*/ 383 if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) && 384 (alt != net)) { 385 /* Found an alternate address */ 386 break; 387 } 388 mnet = alt; 389 } while (alt != NULL); 390 } 391 if (alt == NULL) { 392 return (net); 393 } 394 return (alt); 395 } 396 397 static void 398 sctp_backoff_on_timeout(struct sctp_tcb *stcb, 399 struct sctp_nets *net, 400 int win_probe, 401 int num_marked, int num_abandoned) 402 { 403 if (net->RTO == 0) { 404 net->RTO = stcb->asoc.minrto; 405 } 406 net->RTO <<= 1; 407 if (net->RTO > stcb->asoc.maxrto) { 408 net->RTO = stcb->asoc.maxrto; 409 } 410 if ((win_probe == 0) && (num_marked || num_abandoned)) { 411 /* We don't apply penalty to window probe scenarios */ 412 /* JRS - Use the congestion control given in the CC module */ 413 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net); 414 } 415 } 416 417 #ifndef INVARIANTS 418 static void 419 sctp_recover_sent_list(struct sctp_tcb *stcb) 420 { 421 struct sctp_tmit_chunk *chk, *nchk; 422 struct sctp_association *asoc; 423 424 asoc = &stcb->asoc; 425 TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) { 426 if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) { 427 SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n", 428 (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq); 429 if (chk->sent != SCTP_DATAGRAM_NR_ACKED) { 430 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 431 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 432 } 433 } 434 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next); 435 if (PR_SCTP_ENABLED(chk->flags)) { 436 if (asoc->pr_sctp_cnt != 0) 437 asoc->pr_sctp_cnt--; 438 } 439 if (chk->data) { 440 /*sa_ignore NO_NULL_CHK*/ 441 sctp_free_bufspace(stcb, asoc, chk, 1); 442 sctp_m_freem(chk->data); 443 chk->data = NULL; 444 if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) { 445 asoc->sent_queue_cnt_removeable--; 446 } 447 } 448 asoc->sent_queue_cnt--; 449 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 450 } 451 } 452 SCTP_PRINTF("after recover order is as follows\n"); 453 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 454 SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq); 455 } 456 } 457 #endif 458 459 static int 460 sctp_mark_all_for_resend(struct sctp_tcb *stcb, 461 struct sctp_nets *net, 462 struct sctp_nets *alt, 463 int window_probe, 464 int *num_marked, 465 int *num_abandoned) 466 { 467 468 /* 469 * Mark all chunks (well not all) that were sent to *net for 470 * retransmission. Move them to alt for there destination as well... 471 * We only mark chunks that have been outstanding long enough to 472 * have received feed-back. 473 */ 474 struct sctp_tmit_chunk *chk, *nchk; 475 struct sctp_nets *lnets; 476 struct timeval now, min_wait, tv; 477 int cur_rto; 478 int cnt_abandoned; 479 int audit_tf, num_mk, fir; 480 unsigned int cnt_mk; 481 uint32_t orig_flight, orig_tf; 482 uint32_t tsnlast, tsnfirst; 483 int recovery_cnt = 0; 484 485 486 /* none in flight now */ 487 audit_tf = 0; 488 fir = 0; 489 /* 490 * figure out how long a data chunk must be pending before we can 491 * mark it .. 492 */ 493 (void)SCTP_GETTIME_TIMEVAL(&now); 494 /* get cur rto in micro-seconds */ 495 cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv; 496 cur_rto *= 1000; 497 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 498 sctp_log_fr(cur_rto, 499 stcb->asoc.peers_rwnd, 500 window_probe, 501 SCTP_FR_T3_MARK_TIME); 502 sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT); 503 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT); 504 } 505 tv.tv_sec = cur_rto / 1000000; 506 tv.tv_usec = cur_rto % 1000000; 507 #ifndef __FreeBSD__ 508 timersub(&now, &tv, &min_wait); 509 #else 510 min_wait = now; 511 timevalsub(&min_wait, &tv); 512 #endif 513 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) { 514 /* 515 * if we hit here, we don't have enough seconds on the clock 516 * to account for the RTO. We just let the lower seconds be 517 * the bounds and don't worry about it. This may mean we 518 * will mark a lot more than we should. 519 */ 520 min_wait.tv_sec = min_wait.tv_usec = 0; 521 } 522 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 523 sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME); 524 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME); 525 } 526 /* 527 * Our rwnd will be incorrect here since we are not adding back the 528 * cnt * mbuf but we will fix that down below. 529 */ 530 orig_flight = net->flight_size; 531 orig_tf = stcb->asoc.total_flight; 532 533 net->fast_retran_ip = 0; 534 /* Now on to each chunk */ 535 cnt_abandoned = 0; 536 num_mk = cnt_mk = 0; 537 tsnfirst = tsnlast = 0; 538 #ifndef INVARIANTS 539 start_again: 540 #endif 541 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) { 542 if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) { 543 /* Strange case our list got out of order? */ 544 SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n", 545 (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq); 546 recovery_cnt++; 547 #ifdef INVARIANTS 548 panic("last acked >= chk on sent-Q"); 549 #else 550 SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt); 551 sctp_recover_sent_list(stcb); 552 if (recovery_cnt < 10) { 553 goto start_again; 554 } else { 555 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt); 556 } 557 #endif 558 } 559 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) { 560 /* 561 * found one to mark: If it is less than 562 * DATAGRAM_ACKED it MUST not be a skipped or marked 563 * TSN but instead one that is either already set 564 * for retransmission OR one that needs 565 * retransmission. 566 */ 567 568 /* validate its been outstanding long enough */ 569 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 570 sctp_log_fr(chk->rec.data.TSN_seq, 571 chk->sent_rcv_time.tv_sec, 572 chk->sent_rcv_time.tv_usec, 573 SCTP_FR_T3_MARK_TIME); 574 } 575 if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) { 576 /* 577 * we have reached a chunk that was sent 578 * some seconds past our min.. forget it we 579 * will find no more to send. 580 */ 581 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 582 sctp_log_fr(0, 583 chk->sent_rcv_time.tv_sec, 584 chk->sent_rcv_time.tv_usec, 585 SCTP_FR_T3_STOPPED); 586 } 587 continue; 588 } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) && 589 (window_probe == 0)) { 590 /* 591 * we must look at the micro seconds to 592 * know. 593 */ 594 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) { 595 /* 596 * ok it was sent after our boundary 597 * time. 598 */ 599 continue; 600 } 601 } 602 if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) { 603 /* Is it expired? */ 604 #ifndef __FreeBSD__ 605 if (timercmp(&now, &chk->rec.data.timetodrop, >)) { 606 #else 607 if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) { 608 #endif 609 /* Yes so drop it */ 610 if (chk->data) { 611 (void)sctp_release_pr_sctp_chunk(stcb, 612 chk, 613 1, 614 SCTP_SO_NOT_LOCKED); 615 cnt_abandoned++; 616 } 617 continue; 618 } 619 } 620 if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) { 621 /* Has it been retransmitted tv_sec times? */ 622 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) { 623 if (chk->data) { 624 (void)sctp_release_pr_sctp_chunk(stcb, 625 chk, 626 1, 627 SCTP_SO_NOT_LOCKED); 628 cnt_abandoned++; 629 } 630 continue; 631 } 632 } 633 if (chk->sent < SCTP_DATAGRAM_RESEND) { 634 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 635 num_mk++; 636 if (fir == 0) { 637 fir = 1; 638 tsnfirst = chk->rec.data.TSN_seq; 639 } 640 tsnlast = chk->rec.data.TSN_seq; 641 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 642 sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count, 643 0, SCTP_FR_T3_MARKED); 644 } 645 646 if (chk->rec.data.chunk_was_revoked) { 647 /* deflate the cwnd */ 648 chk->whoTo->cwnd -= chk->book_size; 649 chk->rec.data.chunk_was_revoked = 0; 650 } 651 net->marked_retrans++; 652 stcb->asoc.marked_retrans++; 653 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 654 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO, 655 chk->whoTo->flight_size, 656 chk->book_size, 657 (uintptr_t)chk->whoTo, 658 chk->rec.data.TSN_seq); 659 } 660 sctp_flight_size_decrease(chk); 661 sctp_total_flight_decrease(stcb, chk); 662 stcb->asoc.peers_rwnd += chk->send_size; 663 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh); 664 } 665 chk->sent = SCTP_DATAGRAM_RESEND; 666 SCTP_STAT_INCR(sctps_markedretrans); 667 668 /* reset the TSN for striking and other FR stuff */ 669 chk->rec.data.doing_fast_retransmit = 0; 670 /* Clear any time so NO RTT is being done */ 671 672 if (chk->do_rtt) { 673 if (chk->whoTo->rto_needed == 0) { 674 chk->whoTo->rto_needed = 1; 675 } 676 } 677 chk->do_rtt = 0; 678 if (alt != net) { 679 sctp_free_remote_addr(chk->whoTo); 680 chk->no_fr_allowed = 1; 681 chk->whoTo = alt; 682 atomic_add_int(&alt->ref_count, 1); 683 } else { 684 chk->no_fr_allowed = 0; 685 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 686 chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 687 } else { 688 chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 689 } 690 } 691 /* CMT: Do not allow FRs on retransmitted TSNs. 692 */ 693 if (stcb->asoc.sctp_cmt_on_off > 0) { 694 chk->no_fr_allowed = 1; 695 } 696 #ifdef THIS_SHOULD_NOT_BE_DONE 697 } else if (chk->sent == SCTP_DATAGRAM_ACKED) { 698 /* remember highest acked one */ 699 could_be_sent = chk; 700 #endif 701 } 702 if (chk->sent == SCTP_DATAGRAM_RESEND) { 703 cnt_mk++; 704 } 705 } 706 if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) { 707 /* we did not subtract the same things? */ 708 audit_tf = 1; 709 } 710 711 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 712 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT); 713 } 714 #ifdef SCTP_DEBUG 715 if (num_mk) { 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:%ld\n", 719 num_mk, (u_long)stcb->asoc.peers_rwnd); 720 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n", 721 tsnlast); 722 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n", 723 num_mk, 724 (int)stcb->asoc.peers_rwnd); 725 } 726 #endif 727 *num_marked = num_mk; 728 *num_abandoned = cnt_abandoned; 729 /* Now check for a ECN Echo that may be stranded And 730 * include the cnt_mk'd to have all resends in the 731 * control queue. 732 */ 733 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 734 if (chk->sent == SCTP_DATAGRAM_RESEND) { 735 cnt_mk++; 736 } 737 if ((chk->whoTo == net) && 738 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 739 sctp_free_remote_addr(chk->whoTo); 740 chk->whoTo = alt; 741 if (chk->sent != SCTP_DATAGRAM_RESEND) { 742 chk->sent = SCTP_DATAGRAM_RESEND; 743 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 744 cnt_mk++; 745 } 746 atomic_add_int(&alt->ref_count, 1); 747 } 748 } 749 #ifdef THIS_SHOULD_NOT_BE_DONE 750 if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) { 751 /* fix it so we retransmit the highest acked anyway */ 752 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 753 cnt_mk++; 754 could_be_sent->sent = SCTP_DATAGRAM_RESEND; 755 } 756 #endif 757 if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) { 758 #ifdef INVARIANTS 759 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n", 760 cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk); 761 #endif 762 #ifndef SCTP_AUDITING_ENABLED 763 stcb->asoc.sent_queue_retran_cnt = cnt_mk; 764 #endif 765 } 766 if (audit_tf) { 767 SCTPDBG(SCTP_DEBUG_TIMER4, 768 "Audit total flight due to negative value net:%p\n", 769 (void *)net); 770 stcb->asoc.total_flight = 0; 771 stcb->asoc.total_flight_count = 0; 772 /* Clear all networks flight size */ 773 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) { 774 lnets->flight_size = 0; 775 SCTPDBG(SCTP_DEBUG_TIMER4, 776 "Net:%p c-f cwnd:%d ssthresh:%d\n", 777 (void *)lnets, lnets->cwnd, lnets->ssthresh); 778 } 779 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 780 if (chk->sent < SCTP_DATAGRAM_RESEND) { 781 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 782 sctp_misc_ints(SCTP_FLIGHT_LOG_UP, 783 chk->whoTo->flight_size, 784 chk->book_size, 785 (uintptr_t)chk->whoTo, 786 chk->rec.data.TSN_seq); 787 } 788 789 sctp_flight_size_increase(chk); 790 sctp_total_flight_increase(stcb, chk); 791 } 792 } 793 } 794 /* We return 1 if we only have a window probe outstanding */ 795 return (0); 796 } 797 798 799 int 800 sctp_t3rxt_timer(struct sctp_inpcb *inp, 801 struct sctp_tcb *stcb, 802 struct sctp_nets *net) 803 { 804 struct sctp_nets *alt; 805 int win_probe, num_mk, num_abandoned; 806 807 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 808 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT); 809 } 810 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 811 struct sctp_nets *lnet; 812 813 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) { 814 if (net == lnet) { 815 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3); 816 } else { 817 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3); 818 } 819 } 820 } 821 /* Find an alternate and mark those for retransmission */ 822 if ((stcb->asoc.peers_rwnd == 0) && 823 (stcb->asoc.total_flight < net->mtu)) { 824 SCTP_STAT_INCR(sctps_timowindowprobe); 825 win_probe = 1; 826 } else { 827 win_probe = 0; 828 } 829 830 if (win_probe == 0) { 831 /* We don't do normal threshold management on window probes */ 832 if (sctp_threshold_management(inp, stcb, net, 833 stcb->asoc.max_send_times)) { 834 /* Association was destroyed */ 835 return (1); 836 } else { 837 if (net != stcb->asoc.primary_destination) { 838 /* send a immediate HB if our RTO is stale */ 839 struct timeval now; 840 unsigned int ms_goneby; 841 842 (void)SCTP_GETTIME_TIMEVAL(&now); 843 if (net->last_sent_time.tv_sec) { 844 ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000; 845 } else { 846 ms_goneby = 0; 847 } 848 if ((net->dest_state & SCTP_ADDR_PF) == 0) { 849 if ((ms_goneby > net->RTO) || (net->RTO == 0)) { 850 /* 851 * no recent feed back in an RTO or 852 * more, request a RTT update 853 */ 854 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 855 } 856 } 857 } 858 } 859 } else { 860 /* 861 * For a window probe we don't penalize the net's but only 862 * the association. This may fail it if SACKs are not coming 863 * back. If sack's are coming with rwnd locked at 0, we will 864 * continue to hold things waiting for rwnd to raise 865 */ 866 if (sctp_threshold_management(inp, stcb, NULL, 867 stcb->asoc.max_send_times)) { 868 /* Association was destroyed */ 869 return (1); 870 } 871 } 872 if (stcb->asoc.sctp_cmt_on_off > 0) { 873 if (net->pf_threshold < net->failure_threshold) { 874 alt = sctp_find_alternate_net(stcb, net, 2); 875 } else { 876 /* 877 * CMT: Using RTX_SSTHRESH policy for CMT. 878 * If CMT is being used, then pick dest with 879 * largest ssthresh for any retransmission. 880 */ 881 alt = sctp_find_alternate_net(stcb, net, 1); 882 /* 883 * CUCv2: If a different dest is picked for 884 * the retransmission, then new 885 * (rtx-)pseudo_cumack needs to be tracked 886 * for orig dest. Let CUCv2 track new (rtx-) 887 * pseudo-cumack always. 888 */ 889 net->find_pseudo_cumack = 1; 890 net->find_rtx_pseudo_cumack = 1; 891 } 892 } else { 893 alt = sctp_find_alternate_net(stcb, net, 0); 894 } 895 896 num_mk = 0; 897 num_abandoned = 0; 898 (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe, 899 &num_mk, &num_abandoned); 900 /* FR Loss recovery just ended with the T3. */ 901 stcb->asoc.fast_retran_loss_recovery = 0; 902 903 /* CMT FR loss recovery ended with the T3 */ 904 net->fast_retran_loss_recovery = 0; 905 if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) && 906 (net->flight_size == 0)) { 907 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins)(stcb, net); 908 } 909 910 /* 911 * setup the sat loss recovery that prevents satellite cwnd advance. 912 */ 913 stcb->asoc.sat_t3_loss_recovery = 1; 914 stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq; 915 916 /* Backoff the timer and cwnd */ 917 sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned); 918 if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) || 919 (net->dest_state & SCTP_ADDR_PF)) { 920 /* Move all pending over too */ 921 sctp_move_chunks_from_net(stcb, net); 922 923 /* Get the address that failed, to 924 * force a new src address selecton and 925 * a route allocation. 926 */ 927 if (net->ro._s_addr) { 928 sctp_free_ifa(net->ro._s_addr); 929 net->ro._s_addr = NULL; 930 } 931 net->src_addr_selected = 0; 932 933 /* Force a route allocation too */ 934 if (net->ro.ro_rt) { 935 RTFREE(net->ro.ro_rt); 936 net->ro.ro_rt = NULL; 937 } 938 939 /* Was it our primary? */ 940 if ((stcb->asoc.primary_destination == net) && (alt != net)) { 941 /* 942 * Yes, note it as such and find an alternate note: 943 * this means HB code must use this to resent the 944 * primary if it goes active AND if someone does a 945 * change-primary then this flag must be cleared 946 * from any net structures. 947 */ 948 if (stcb->asoc.alternate) { 949 sctp_free_remote_addr(stcb->asoc.alternate); 950 } 951 stcb->asoc.alternate = alt; 952 atomic_add_int(&stcb->asoc.alternate->ref_count, 1); 953 } 954 } 955 /* 956 * Special case for cookie-echo'ed case, we don't do output but must 957 * await the COOKIE-ACK before retransmission 958 */ 959 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 960 /* 961 * Here we just reset the timer and start again since we 962 * have not established the asoc 963 */ 964 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net); 965 return (0); 966 } 967 if (stcb->asoc.prsctp_supported) { 968 struct sctp_tmit_chunk *lchk; 969 970 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc); 971 /* C3. See if we need to send a Fwd-TSN */ 972 if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) { 973 send_forward_tsn(stcb, &stcb->asoc); 974 if (lchk) { 975 /* Assure a timer is up */ 976 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo); 977 } 978 } 979 } 980 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 981 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX); 982 } 983 return (0); 984 } 985 986 int 987 sctp_t1init_timer(struct sctp_inpcb *inp, 988 struct sctp_tcb *stcb, 989 struct sctp_nets *net) 990 { 991 /* bump the thresholds */ 992 if (stcb->asoc.delayed_connection) { 993 /* 994 * special hook for delayed connection. The library did NOT 995 * complete the rest of its sends. 996 */ 997 stcb->asoc.delayed_connection = 0; 998 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED); 999 return (0); 1000 } 1001 if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) { 1002 return (0); 1003 } 1004 if (sctp_threshold_management(inp, stcb, net, 1005 stcb->asoc.max_init_times)) { 1006 /* Association was destroyed */ 1007 return (1); 1008 } 1009 stcb->asoc.dropped_special_cnt = 0; 1010 sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0); 1011 if (stcb->asoc.initial_init_rto_max < net->RTO) { 1012 net->RTO = stcb->asoc.initial_init_rto_max; 1013 } 1014 if (stcb->asoc.numnets > 1) { 1015 /* If we have more than one addr use it */ 1016 struct sctp_nets *alt; 1017 1018 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0); 1019 if (alt != stcb->asoc.primary_destination) { 1020 sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination); 1021 stcb->asoc.primary_destination = alt; 1022 } 1023 } 1024 /* Send out a new init */ 1025 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED); 1026 return (0); 1027 } 1028 1029 /* 1030 * For cookie and asconf we actually need to find and mark for resend, then 1031 * increment the resend counter (after all the threshold management stuff of 1032 * course). 1033 */ 1034 int 1035 sctp_cookie_timer(struct sctp_inpcb *inp, 1036 struct sctp_tcb *stcb, 1037 struct sctp_nets *net SCTP_UNUSED) 1038 { 1039 struct sctp_nets *alt; 1040 struct sctp_tmit_chunk *cookie; 1041 1042 /* first before all else we must find the cookie */ 1043 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) { 1044 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 1045 break; 1046 } 1047 } 1048 if (cookie == NULL) { 1049 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 1050 /* FOOBAR! */ 1051 struct mbuf *op_err; 1052 1053 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, 1054 "Cookie timer expired, but no cookie"); 1055 inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_4; 1056 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 1057 } else { 1058 #ifdef INVARIANTS 1059 panic("Cookie timer expires in wrong state?"); 1060 #else 1061 SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc)); 1062 return (0); 1063 #endif 1064 } 1065 return (0); 1066 } 1067 /* Ok we found the cookie, threshold management next */ 1068 if (sctp_threshold_management(inp, stcb, cookie->whoTo, 1069 stcb->asoc.max_init_times)) { 1070 /* Assoc is over */ 1071 return (1); 1072 } 1073 /* 1074 * cleared theshold management now lets backoff the address & select 1075 * an alternate 1076 */ 1077 stcb->asoc.dropped_special_cnt = 0; 1078 sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0); 1079 alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0); 1080 if (alt != cookie->whoTo) { 1081 sctp_free_remote_addr(cookie->whoTo); 1082 cookie->whoTo = alt; 1083 atomic_add_int(&alt->ref_count, 1); 1084 } 1085 /* Now mark the retran info */ 1086 if (cookie->sent != SCTP_DATAGRAM_RESEND) { 1087 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1088 } 1089 cookie->sent = SCTP_DATAGRAM_RESEND; 1090 /* 1091 * Now call the output routine to kick out the cookie again, Note we 1092 * don't mark any chunks for retran so that FR will need to kick in 1093 * to move these (or a send timer). 1094 */ 1095 return (0); 1096 } 1097 1098 int 1099 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1100 struct sctp_nets *net) 1101 { 1102 struct sctp_nets *alt; 1103 struct sctp_tmit_chunk *strrst = NULL, *chk = NULL; 1104 1105 if (stcb->asoc.stream_reset_outstanding == 0) { 1106 return (0); 1107 } 1108 /* find the existing STRRESET, we use the seq number we sent out on */ 1109 (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst); 1110 if (strrst == NULL) { 1111 return (0); 1112 } 1113 /* do threshold management */ 1114 if (sctp_threshold_management(inp, stcb, strrst->whoTo, 1115 stcb->asoc.max_send_times)) { 1116 /* Assoc is over */ 1117 return (1); 1118 } 1119 /* 1120 * cleared theshold management now lets backoff the address & select 1121 * an alternate 1122 */ 1123 sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0); 1124 alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0); 1125 sctp_free_remote_addr(strrst->whoTo); 1126 strrst->whoTo = alt; 1127 atomic_add_int(&alt->ref_count, 1); 1128 1129 /* See if a ECN Echo is also stranded */ 1130 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 1131 if ((chk->whoTo == net) && 1132 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 1133 sctp_free_remote_addr(chk->whoTo); 1134 if (chk->sent != SCTP_DATAGRAM_RESEND) { 1135 chk->sent = SCTP_DATAGRAM_RESEND; 1136 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1137 } 1138 chk->whoTo = alt; 1139 atomic_add_int(&alt->ref_count, 1); 1140 } 1141 } 1142 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 1143 /* 1144 * If the address went un-reachable, we need to move to 1145 * alternates for ALL chk's in queue 1146 */ 1147 sctp_move_chunks_from_net(stcb, net); 1148 } 1149 /* mark the retran info */ 1150 if (strrst->sent != SCTP_DATAGRAM_RESEND) 1151 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1152 strrst->sent = SCTP_DATAGRAM_RESEND; 1153 1154 /* restart the timer */ 1155 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo); 1156 return (0); 1157 } 1158 1159 int 1160 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1161 struct sctp_nets *net) 1162 { 1163 struct sctp_nets *alt; 1164 struct sctp_tmit_chunk *asconf, *chk; 1165 1166 /* is this a first send, or a retransmission? */ 1167 if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) { 1168 /* compose a new ASCONF chunk and send it */ 1169 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED); 1170 } else { 1171 /* 1172 * Retransmission of the existing ASCONF is needed 1173 */ 1174 1175 /* find the existing ASCONF */ 1176 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue); 1177 if (asconf == NULL) { 1178 return (0); 1179 } 1180 /* do threshold management */ 1181 if (sctp_threshold_management(inp, stcb, asconf->whoTo, 1182 stcb->asoc.max_send_times)) { 1183 /* Assoc is over */ 1184 return (1); 1185 } 1186 if (asconf->snd_count > stcb->asoc.max_send_times) { 1187 /* 1188 * Something is rotten: our peer is not responding to 1189 * ASCONFs but apparently is to other chunks. i.e. it 1190 * is not properly handling the chunk type upper bits. 1191 * Mark this peer as ASCONF incapable and cleanup. 1192 */ 1193 SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n"); 1194 sctp_asconf_cleanup(stcb, net); 1195 return (0); 1196 } 1197 /* 1198 * cleared threshold management, so now backoff the net and 1199 * select an alternate 1200 */ 1201 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0); 1202 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0); 1203 if (asconf->whoTo != alt) { 1204 sctp_free_remote_addr(asconf->whoTo); 1205 asconf->whoTo = alt; 1206 atomic_add_int(&alt->ref_count, 1); 1207 } 1208 1209 /* See if an ECN Echo is also stranded */ 1210 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 1211 if ((chk->whoTo == net) && 1212 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 1213 sctp_free_remote_addr(chk->whoTo); 1214 chk->whoTo = alt; 1215 if (chk->sent != SCTP_DATAGRAM_RESEND) { 1216 chk->sent = SCTP_DATAGRAM_RESEND; 1217 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1218 } 1219 atomic_add_int(&alt->ref_count, 1); 1220 } 1221 } 1222 TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) { 1223 if (chk->whoTo != alt) { 1224 sctp_free_remote_addr(chk->whoTo); 1225 chk->whoTo = alt; 1226 atomic_add_int(&alt->ref_count, 1); 1227 } 1228 if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT) 1229 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1230 chk->sent = SCTP_DATAGRAM_RESEND; 1231 } 1232 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) { 1233 /* 1234 * If the address went un-reachable, we need to move 1235 * to the alternate for ALL chunks in queue 1236 */ 1237 sctp_move_chunks_from_net(stcb, net); 1238 } 1239 /* mark the retran info */ 1240 if (asconf->sent != SCTP_DATAGRAM_RESEND) 1241 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1242 asconf->sent = SCTP_DATAGRAM_RESEND; 1243 1244 /* send another ASCONF if any and we can do */ 1245 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED); 1246 } 1247 return (0); 1248 } 1249 1250 /* Mobility adaptation */ 1251 void 1252 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1253 struct sctp_nets *net SCTP_UNUSED) 1254 { 1255 if (stcb->asoc.deleted_primary == NULL) { 1256 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n"); 1257 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED); 1258 return; 1259 } 1260 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary "); 1261 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa); 1262 sctp_free_remote_addr(stcb->asoc.deleted_primary); 1263 stcb->asoc.deleted_primary = NULL; 1264 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED); 1265 return; 1266 } 1267 1268 /* 1269 * For the shutdown and shutdown-ack, we do not keep one around on the 1270 * control queue. This means we must generate a new one and call the general 1271 * chunk output routine, AFTER having done threshold management. 1272 * It is assumed that net is non-NULL. 1273 */ 1274 int 1275 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1276 struct sctp_nets *net) 1277 { 1278 struct sctp_nets *alt; 1279 1280 /* first threshold managment */ 1281 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) { 1282 /* Assoc is over */ 1283 return (1); 1284 } 1285 sctp_backoff_on_timeout(stcb, net, 1, 0, 0); 1286 /* second select an alternative */ 1287 alt = sctp_find_alternate_net(stcb, net, 0); 1288 1289 /* third generate a shutdown into the queue for out net */ 1290 sctp_send_shutdown(stcb, alt); 1291 1292 /* fourth restart timer */ 1293 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt); 1294 return (0); 1295 } 1296 1297 int 1298 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1299 struct sctp_nets *net) 1300 { 1301 struct sctp_nets *alt; 1302 1303 /* first threshold managment */ 1304 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) { 1305 /* Assoc is over */ 1306 return (1); 1307 } 1308 sctp_backoff_on_timeout(stcb, net, 1, 0, 0); 1309 /* second select an alternative */ 1310 alt = sctp_find_alternate_net(stcb, net, 0); 1311 1312 /* third generate a shutdown into the queue for out net */ 1313 sctp_send_shutdown_ack(stcb, alt); 1314 1315 /* fourth restart timer */ 1316 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt); 1317 return (0); 1318 } 1319 1320 static void 1321 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp, 1322 struct sctp_tcb *stcb) 1323 { 1324 struct sctp_stream_queue_pending *sp; 1325 unsigned int i, chks_in_queue = 0; 1326 int being_filled = 0; 1327 /* 1328 * This function is ONLY called when the send/sent queues are empty. 1329 */ 1330 if ((stcb == NULL) || (inp == NULL)) 1331 return; 1332 1333 if (stcb->asoc.sent_queue_retran_cnt) { 1334 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n", 1335 stcb->asoc.sent_queue_retran_cnt); 1336 stcb->asoc.sent_queue_retran_cnt = 0; 1337 } 1338 if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) { 1339 /* No stream scheduler information, initialize scheduler */ 1340 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0); 1341 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) { 1342 /* yep, we lost a stream or two */ 1343 SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n"); 1344 } else { 1345 /* no streams lost */ 1346 stcb->asoc.total_output_queue_size = 0; 1347 } 1348 } 1349 /* Check to see if some data queued, if so report it */ 1350 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1351 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 1352 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) { 1353 if (sp->msg_is_complete) 1354 being_filled++; 1355 chks_in_queue++; 1356 } 1357 } 1358 } 1359 if (chks_in_queue != stcb->asoc.stream_queue_cnt) { 1360 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n", 1361 stcb->asoc.stream_queue_cnt, chks_in_queue); 1362 } 1363 if (chks_in_queue) { 1364 /* call the output queue function */ 1365 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED); 1366 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) && 1367 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 1368 /* 1369 * Probably should go in and make it go back through 1370 * and add fragments allowed 1371 */ 1372 if (being_filled == 0) { 1373 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n", 1374 chks_in_queue); 1375 } 1376 } 1377 } else { 1378 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n", 1379 (u_long)stcb->asoc.total_output_queue_size); 1380 stcb->asoc.total_output_queue_size = 0; 1381 } 1382 } 1383 1384 int 1385 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1386 struct sctp_nets *net) 1387 { 1388 uint8_t net_was_pf; 1389 1390 if (net->dest_state & SCTP_ADDR_PF) { 1391 net_was_pf = 1; 1392 } else { 1393 net_was_pf = 0; 1394 } 1395 if (net->hb_responded == 0) { 1396 if (net->ro._s_addr) { 1397 /* Invalidate the src address if we did not get 1398 * a response last time. 1399 */ 1400 sctp_free_ifa(net->ro._s_addr); 1401 net->ro._s_addr = NULL; 1402 net->src_addr_selected = 0; 1403 } 1404 sctp_backoff_on_timeout(stcb, net, 1, 0, 0); 1405 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) { 1406 /* Assoc is over */ 1407 return (1); 1408 } 1409 } 1410 /* Zero PBA, if it needs it */ 1411 if (net->partial_bytes_acked) { 1412 net->partial_bytes_acked = 0; 1413 } 1414 if ((stcb->asoc.total_output_queue_size > 0) && 1415 (TAILQ_EMPTY(&stcb->asoc.send_queue)) && 1416 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 1417 sctp_audit_stream_queues_for_size(inp, stcb); 1418 } 1419 if (!(net->dest_state & SCTP_ADDR_NOHB) && 1420 !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) { 1421 /* when move to PF during threshold mangement, a HB has been 1422 queued in that routine */ 1423 uint32_t ms_gone_by; 1424 1425 if ((net->last_sent_time.tv_sec > 0) || 1426 (net->last_sent_time.tv_usec > 0)) { 1427 #ifdef __FreeBSD__ 1428 struct timeval diff; 1429 1430 SCTP_GETTIME_TIMEVAL(&diff); 1431 timevalsub(&diff, &net->last_sent_time); 1432 #else 1433 struct timeval diff, now; 1434 1435 SCTP_GETTIME_TIMEVAL(&now); 1436 timersub(&now, &net->last_sent_time, &diff); 1437 #endif 1438 ms_gone_by = (uint32_t)(diff.tv_sec * 1000) + 1439 (uint32_t)(diff.tv_usec / 1000); 1440 } else { 1441 ms_gone_by = 0xffffffff; 1442 } 1443 if ((ms_gone_by >= net->heart_beat_delay) || 1444 (net->dest_state & SCTP_ADDR_PF)) { 1445 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 1446 } 1447 } 1448 return (0); 1449 } 1450 1451 void 1452 sctp_pathmtu_timer(struct sctp_inpcb *inp, 1453 struct sctp_tcb *stcb, 1454 struct sctp_nets *net) 1455 { 1456 uint32_t next_mtu, mtu; 1457 1458 next_mtu = sctp_get_next_mtu(net->mtu); 1459 1460 if ((next_mtu > net->mtu) && (net->port == 0)) { 1461 if ((net->src_addr_selected == 0) || 1462 (net->ro._s_addr == NULL) || 1463 (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) { 1464 if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) { 1465 sctp_free_ifa(net->ro._s_addr); 1466 net->ro._s_addr = NULL; 1467 net->src_addr_selected = 0; 1468 } else if (net->ro._s_addr == NULL) { 1469 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE) 1470 if (net->ro._l_addr.sa.sa_family == AF_INET6) { 1471 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1472 /* KAME hack: embed scopeid */ 1473 #if defined(__APPLE__) 1474 #if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD) 1475 (void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL); 1476 #else 1477 (void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL, NULL); 1478 #endif 1479 #elif defined(SCTP_KAME) 1480 (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)); 1481 #else 1482 (void)in6_embedscope(&sin6->sin6_addr, sin6); 1483 #endif 1484 } 1485 #endif 1486 1487 net->ro._s_addr = sctp_source_address_selection(inp, 1488 stcb, 1489 (sctp_route_t *)&net->ro, 1490 net, 0, stcb->asoc.vrf_id); 1491 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE) 1492 if (net->ro._l_addr.sa.sa_family == AF_INET6) { 1493 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1494 #ifdef SCTP_KAME 1495 (void)sa6_recoverscope(sin6); 1496 #else 1497 (void)in6_recoverscope(sin6, &sin6->sin6_addr, NULL); 1498 #endif /* SCTP_KAME */ 1499 } 1500 #endif /* INET6 */ 1501 } 1502 if (net->ro._s_addr) 1503 net->src_addr_selected = 1; 1504 } 1505 if (net->ro._s_addr) { 1506 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt); 1507 #if defined(INET) || defined(INET6) 1508 if (net->port) { 1509 mtu -= sizeof(struct udphdr); 1510 } 1511 #endif 1512 if (mtu > next_mtu) { 1513 net->mtu = next_mtu; 1514 } 1515 } 1516 } 1517 /* restart the timer */ 1518 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net); 1519 } 1520 1521 void 1522 sctp_autoclose_timer(struct sctp_inpcb *inp, 1523 struct sctp_tcb *stcb, 1524 struct sctp_nets *net) 1525 { 1526 struct timeval tn, *tim_touse; 1527 struct sctp_association *asoc; 1528 int ticks_gone_by; 1529 1530 (void)SCTP_GETTIME_TIMEVAL(&tn); 1531 if (stcb->asoc.sctp_autoclose_ticks && 1532 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1533 /* Auto close is on */ 1534 asoc = &stcb->asoc; 1535 /* pick the time to use */ 1536 if (asoc->time_last_rcvd.tv_sec > 1537 asoc->time_last_sent.tv_sec) { 1538 tim_touse = &asoc->time_last_rcvd; 1539 } else { 1540 tim_touse = &asoc->time_last_sent; 1541 } 1542 /* Now has long enough transpired to autoclose? */ 1543 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec); 1544 if ((ticks_gone_by > 0) && 1545 (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) { 1546 /* 1547 * autoclose time has hit, call the output routine, 1548 * which should do nothing just to be SURE we don't 1549 * have hanging data. We can then safely check the 1550 * queues and know that we are clear to send 1551 * shutdown 1552 */ 1553 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED); 1554 /* Are we clean? */ 1555 if (TAILQ_EMPTY(&asoc->send_queue) && 1556 TAILQ_EMPTY(&asoc->sent_queue)) { 1557 /* 1558 * there is nothing queued to send, so I'm 1559 * done... 1560 */ 1561 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1562 /* only send SHUTDOWN 1st time thru */ 1563 struct sctp_nets *netp; 1564 1565 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 1566 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 1567 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 1568 } 1569 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 1570 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 1571 sctp_stop_timers_for_shutdown(stcb); 1572 if (stcb->asoc.alternate) { 1573 netp = stcb->asoc.alternate; 1574 } else { 1575 netp = stcb->asoc.primary_destination; 1576 } 1577 sctp_send_shutdown(stcb, netp); 1578 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 1579 stcb->sctp_ep, stcb, 1580 netp); 1581 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1582 stcb->sctp_ep, stcb, 1583 netp); 1584 } 1585 } 1586 } else { 1587 /* 1588 * No auto close at this time, reset t-o to check 1589 * later 1590 */ 1591 int tmp; 1592 1593 /* fool the timer startup to use the time left */ 1594 tmp = asoc->sctp_autoclose_ticks; 1595 asoc->sctp_autoclose_ticks -= ticks_gone_by; 1596 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1597 net); 1598 /* restore the real tick value */ 1599 asoc->sctp_autoclose_ticks = tmp; 1600 } 1601 } 1602 } 1603 1604
