1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* $KAME: sctp_timer.c,v 1.29 2005/03/06 16:04:18 itojun Exp $ */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #define _IP_VHL 37 #include <netinet/sctp_os.h> 38 #include <netinet/sctp_pcb.h> 39 #ifdef INET6 40 #endif 41 #include <netinet/sctp_var.h> 42 #include <netinet/sctp_sysctl.h> 43 #include <netinet/sctp_timer.h> 44 #include <netinet/sctputil.h> 45 #include <netinet/sctp_output.h> 46 #include <netinet/sctp_header.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_input.h> 50 #include <netinet/sctp.h> 51 #include <netinet/sctp_uio.h> 52 53 54 55 void 56 sctp_early_fr_timer(struct sctp_inpcb *inp, 57 struct sctp_tcb *stcb, 58 struct sctp_nets *net) 59 { 60 struct sctp_tmit_chunk *chk, *tp2; 61 struct timeval now, min_wait, tv; 62 unsigned int cur_rtt, cnt = 0, cnt_resend = 0; 63 64 /* an early FR is occuring. */ 65 (void)SCTP_GETTIME_TIMEVAL(&now); 66 /* get cur rto in micro-seconds */ 67 if (net->lastsa == 0) { 68 /* Hmm no rtt estimate yet? */ 69 cur_rtt = stcb->asoc.initial_rto >> 2; 70 } else { 71 72 cur_rtt = ((net->lastsa >> 2) + net->lastsv) >> 1; 73 } 74 if (cur_rtt < SCTP_BASE_SYSCTL(sctp_early_fr_msec)) { 75 cur_rtt = SCTP_BASE_SYSCTL(sctp_early_fr_msec); 76 } 77 cur_rtt *= 1000; 78 tv.tv_sec = cur_rtt / 1000000; 79 tv.tv_usec = cur_rtt % 1000000; 80 min_wait = now; 81 timevalsub(&min_wait, &tv); 82 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) { 83 /* 84 * if we hit here, we don't have enough seconds on the clock 85 * to account for the RTO. We just let the lower seconds be 86 * the bounds and don't worry about it. This may mean we 87 * will mark a lot more than we should. 88 */ 89 min_wait.tv_sec = min_wait.tv_usec = 0; 90 } 91 chk = TAILQ_LAST(&stcb->asoc.sent_queue, sctpchunk_listhead); 92 for (; chk != NULL; chk = tp2) { 93 tp2 = TAILQ_PREV(chk, sctpchunk_listhead, sctp_next); 94 if (chk->whoTo != net) { 95 continue; 96 } 97 if (chk->sent == SCTP_DATAGRAM_RESEND) 98 cnt_resend++; 99 else if ((chk->sent > SCTP_DATAGRAM_UNSENT) && 100 (chk->sent < SCTP_DATAGRAM_RESEND)) { 101 /* pending, may need retran */ 102 if (chk->sent_rcv_time.tv_sec > min_wait.tv_sec) { 103 /* 104 * we have reached a chunk that was sent 105 * some seconds past our min.. forget it we 106 * will find no more to send. 107 */ 108 continue; 109 } else if (chk->sent_rcv_time.tv_sec == min_wait.tv_sec) { 110 /* 111 * we must look at the micro seconds to 112 * know. 113 */ 114 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) { 115 /* 116 * ok it was sent after our boundary 117 * time. 118 */ 119 continue; 120 } 121 } 122 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_EARLYFR_LOGGING_ENABLE) { 123 sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count, 124 4, SCTP_FR_MARKED_EARLY); 125 } 126 SCTP_STAT_INCR(sctps_earlyfrmrkretrans); 127 chk->sent = SCTP_DATAGRAM_RESEND; 128 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 129 /* double book size since we are doing an early FR */ 130 chk->book_size_scale++; 131 cnt += chk->send_size; 132 if ((cnt + net->flight_size) > net->cwnd) { 133 /* Mark all we could possibly resend */ 134 break; 135 } 136 } 137 } 138 if (cnt) { 139 /* 140 * JRS - Use the congestion control given in the congestion 141 * control module 142 */ 143 stcb->asoc.cc_functions.sctp_cwnd_update_after_fr_timer(inp, stcb, net); 144 } else if (cnt_resend) { 145 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_EARLY_FR_TMR, SCTP_SO_NOT_LOCKED); 146 } 147 /* Restart it? */ 148 if (net->flight_size < net->cwnd) { 149 SCTP_STAT_INCR(sctps_earlyfrstrtmr); 150 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net); 151 } 152 } 153 154 void 155 sctp_audit_retranmission_queue(struct sctp_association *asoc) 156 { 157 struct sctp_tmit_chunk *chk; 158 159 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n", 160 asoc->sent_queue_retran_cnt, 161 asoc->sent_queue_cnt); 162 asoc->sent_queue_retran_cnt = 0; 163 asoc->sent_queue_cnt = 0; 164 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 165 if (chk->sent == SCTP_DATAGRAM_RESEND) { 166 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 167 } 168 asoc->sent_queue_cnt++; 169 } 170 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) { 171 if (chk->sent == SCTP_DATAGRAM_RESEND) { 172 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 173 } 174 } 175 TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) { 176 if (chk->sent == SCTP_DATAGRAM_RESEND) { 177 sctp_ucount_incr(asoc->sent_queue_retran_cnt); 178 } 179 } 180 SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n", 181 asoc->sent_queue_retran_cnt, 182 asoc->sent_queue_cnt); 183 } 184 185 int 186 sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 187 struct sctp_nets *net, uint16_t threshold) 188 { 189 if (net) { 190 net->error_count++; 191 SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n", 192 net, net->error_count, 193 net->failure_threshold); 194 if (net->error_count > net->failure_threshold) { 195 /* We had a threshold failure */ 196 if (net->dest_state & SCTP_ADDR_REACHABLE) { 197 net->dest_state &= ~SCTP_ADDR_REACHABLE; 198 net->dest_state |= SCTP_ADDR_NOT_REACHABLE; 199 net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 200 if (net == stcb->asoc.primary_destination) { 201 net->dest_state |= SCTP_ADDR_WAS_PRIMARY; 202 } 203 /* 204 * JRS 5/14/07 - If a destination is 205 * unreachable, the PF bit is turned off. 206 * This allows an unambiguous use of the PF 207 * bit for destinations that are reachable 208 * but potentially failed. If the 209 * destination is set to the unreachable 210 * state, also set the destination to the PF 211 * state. 212 */ 213 /* 214 * Add debug message here if destination is 215 * not in PF state. 216 */ 217 /* Stop any running T3 timers here? */ 218 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) { 219 net->dest_state &= ~SCTP_ADDR_PF; 220 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n", 221 net); 222 } 223 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 224 stcb, 225 SCTP_FAILED_THRESHOLD, 226 (void *)net, SCTP_SO_NOT_LOCKED); 227 } 228 } 229 /*********HOLD THIS COMMENT FOR PATCH OF ALTERNATE 230 *********ROUTING CODE 231 */ 232 /*********HOLD THIS COMMENT FOR END OF PATCH OF ALTERNATE 233 *********ROUTING CODE 234 */ 235 } 236 if (stcb == NULL) 237 return (0); 238 239 if (net) { 240 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) { 241 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 242 sctp_misc_ints(SCTP_THRESHOLD_INCR, 243 stcb->asoc.overall_error_count, 244 (stcb->asoc.overall_error_count + 1), 245 SCTP_FROM_SCTP_TIMER, 246 __LINE__); 247 } 248 stcb->asoc.overall_error_count++; 249 } 250 } else { 251 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 252 sctp_misc_ints(SCTP_THRESHOLD_INCR, 253 stcb->asoc.overall_error_count, 254 (stcb->asoc.overall_error_count + 1), 255 SCTP_FROM_SCTP_TIMER, 256 __LINE__); 257 } 258 stcb->asoc.overall_error_count++; 259 } 260 SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n", 261 &stcb->asoc, stcb->asoc.overall_error_count, 262 (uint32_t) threshold, 263 ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state)); 264 /* 265 * We specifically do not do >= to give the assoc one more change 266 * before we fail it. 267 */ 268 if (stcb->asoc.overall_error_count > threshold) { 269 /* Abort notification sends a ULP notify */ 270 struct mbuf *oper; 271 272 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 273 0, M_DONTWAIT, 1, MT_DATA); 274 if (oper) { 275 struct sctp_paramhdr *ph; 276 uint32_t *ippp; 277 278 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 279 sizeof(uint32_t); 280 ph = mtod(oper, struct sctp_paramhdr *); 281 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 282 ph->param_length = htons(SCTP_BUF_LEN(oper)); 283 ippp = (uint32_t *) (ph + 1); 284 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_1); 285 } 286 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_1; 287 sctp_abort_an_association(inp, stcb, SCTP_FAILED_THRESHOLD, oper, SCTP_SO_NOT_LOCKED); 288 return (1); 289 } 290 return (0); 291 } 292 293 struct sctp_nets * 294 sctp_find_alternate_net(struct sctp_tcb *stcb, 295 struct sctp_nets *net, 296 int mode) 297 { 298 /* Find and return an alternate network if possible */ 299 struct sctp_nets *alt, *mnet, *min_errors_net = NULL, *max_cwnd_net = NULL; 300 int once; 301 302 /* JRS 5/14/07 - Initialize min_errors to an impossible value. */ 303 int min_errors = -1; 304 uint32_t max_cwnd = 0; 305 306 if (stcb->asoc.numnets == 1) { 307 /* No others but net */ 308 return (TAILQ_FIRST(&stcb->asoc.nets)); 309 } 310 /* 311 * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate 312 * net algorithm. This algorithm chooses the active destination (not 313 * in PF state) with the largest cwnd value. If all destinations are 314 * in PF state, unreachable, or unconfirmed, choose the desination 315 * that is in PF state with the lowest error count. In case of a 316 * tie, choose the destination that was most recently active. 317 */ 318 if (mode == 2) { 319 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) { 320 /* 321 * JRS 5/14/07 - If the destination is unreachable 322 * or unconfirmed, skip it. 323 */ 324 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) || 325 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) { 326 continue; 327 } 328 /* 329 * JRS 5/14/07 - If the destination is reachable 330 * but in PF state, compare the error count of the 331 * destination to the minimum error count seen thus 332 * far. Store the destination with the lower error 333 * count. If the error counts are equal, store the 334 * destination that was most recently active. 335 */ 336 if (mnet->dest_state & SCTP_ADDR_PF) { 337 /* 338 * JRS 5/14/07 - If the destination under 339 * consideration is the current destination, 340 * work as if the error count is one higher. 341 * The actual error count will not be 342 * incremented until later in the t3 343 * handler. 344 */ 345 if (mnet == net) { 346 if (min_errors == -1) { 347 min_errors = mnet->error_count + 1; 348 min_errors_net = mnet; 349 } else if (mnet->error_count + 1 < min_errors) { 350 min_errors = mnet->error_count + 1; 351 min_errors_net = mnet; 352 } else if (mnet->error_count + 1 == min_errors 353 && mnet->last_active > min_errors_net->last_active) { 354 min_errors_net = mnet; 355 min_errors = mnet->error_count + 1; 356 } 357 continue; 358 } else { 359 if (min_errors == -1) { 360 min_errors = mnet->error_count; 361 min_errors_net = mnet; 362 } else if (mnet->error_count < min_errors) { 363 min_errors = mnet->error_count; 364 min_errors_net = mnet; 365 } else if (mnet->error_count == min_errors 366 && mnet->last_active > min_errors_net->last_active) { 367 min_errors_net = mnet; 368 min_errors = mnet->error_count; 369 } 370 continue; 371 } 372 } 373 /* 374 * JRS 5/14/07 - If the destination is reachable and 375 * not in PF state, compare the cwnd of the 376 * destination to the highest cwnd seen thus far. 377 * Store the destination with the higher cwnd value. 378 * If the cwnd values are equal, randomly choose one 379 * of the two destinations. 380 */ 381 if (max_cwnd < mnet->cwnd) { 382 max_cwnd_net = mnet; 383 max_cwnd = mnet->cwnd; 384 } else if (max_cwnd == mnet->cwnd) { 385 uint32_t rndval; 386 uint8_t this_random; 387 388 if (stcb->asoc.hb_random_idx > 3) { 389 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep); 390 memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values)); 391 this_random = stcb->asoc.hb_random_values[0]; 392 stcb->asoc.hb_random_idx++; 393 stcb->asoc.hb_ect_randombit = 0; 394 } else { 395 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx]; 396 stcb->asoc.hb_random_idx++; 397 stcb->asoc.hb_ect_randombit = 0; 398 } 399 if (this_random % 2 == 1) { 400 max_cwnd_net = mnet; 401 max_cwnd = mnet->cwnd; /* Useless? */ 402 } 403 } 404 } 405 /* 406 * JRS 5/14/07 - After all destination have been considered 407 * as alternates, check to see if there was some active 408 * destination (not in PF state). If not, check to see if 409 * there was some PF destination with the minimum number of 410 * errors. If not, return the original destination. If 411 * there is a min_errors_net, remove the PF flag from that 412 * destination, set the cwnd to one or two MTUs, and return 413 * the destination as an alt. If there was some active 414 * destination with a highest cwnd, return the destination 415 * as an alt. 416 */ 417 if (max_cwnd_net == NULL) { 418 if (min_errors_net == NULL) { 419 return (net); 420 } 421 min_errors_net->dest_state &= ~SCTP_ADDR_PF; 422 min_errors_net->cwnd = min_errors_net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf); 423 if (SCTP_OS_TIMER_PENDING(&min_errors_net->rxt_timer.timer)) { 424 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 425 stcb, min_errors_net, 426 SCTP_FROM_SCTP_TIMER + SCTP_LOC_2); 427 } 428 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to active with %d errors.\n", 429 min_errors_net, min_errors_net->error_count); 430 return (min_errors_net); 431 } else { 432 return (max_cwnd_net); 433 } 434 } 435 /* 436 * JRS 5/14/07 - If mode is set to 1, use the CMT policy for 437 * choosing an alternate net. 438 */ 439 else if (mode == 1) { 440 TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) { 441 if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) || 442 (mnet->dest_state & SCTP_ADDR_UNCONFIRMED) 443 ) { 444 /* 445 * will skip ones that are not-reachable or 446 * unconfirmed 447 */ 448 continue; 449 } 450 if (max_cwnd < mnet->cwnd) { 451 max_cwnd_net = mnet; 452 max_cwnd = mnet->cwnd; 453 } else if (max_cwnd == mnet->cwnd) { 454 uint32_t rndval; 455 uint8_t this_random; 456 457 if (stcb->asoc.hb_random_idx > 3) { 458 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep); 459 memcpy(stcb->asoc.hb_random_values, &rndval, 460 sizeof(stcb->asoc.hb_random_values)); 461 this_random = stcb->asoc.hb_random_values[0]; 462 stcb->asoc.hb_random_idx = 0; 463 stcb->asoc.hb_ect_randombit = 0; 464 } else { 465 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx]; 466 stcb->asoc.hb_random_idx++; 467 stcb->asoc.hb_ect_randombit = 0; 468 } 469 if (this_random % 2) { 470 max_cwnd_net = mnet; 471 max_cwnd = mnet->cwnd; 472 } 473 } 474 } 475 if (max_cwnd_net) { 476 return (max_cwnd_net); 477 } 478 } 479 mnet = net; 480 once = 0; 481 482 if (mnet == NULL) { 483 mnet = TAILQ_FIRST(&stcb->asoc.nets); 484 } 485 do { 486 alt = TAILQ_NEXT(mnet, sctp_next); 487 if (alt == NULL) { 488 once++; 489 if (once > 1) { 490 break; 491 } 492 alt = TAILQ_FIRST(&stcb->asoc.nets); 493 } 494 if (alt->ro.ro_rt == NULL) { 495 if (alt->ro._s_addr) { 496 sctp_free_ifa(alt->ro._s_addr); 497 alt->ro._s_addr = NULL; 498 } 499 alt->src_addr_selected = 0; 500 } 501 if ( 502 ((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) && 503 (alt->ro.ro_rt != NULL) && 504 /* sa_ignore NO_NULL_CHK */ 505 (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) 506 ) { 507 /* Found a reachable address */ 508 break; 509 } 510 mnet = alt; 511 } while (alt != NULL); 512 513 if (alt == NULL) { 514 /* Case where NO insv network exists (dormant state) */ 515 /* we rotate destinations */ 516 once = 0; 517 mnet = net; 518 do { 519 alt = TAILQ_NEXT(mnet, sctp_next); 520 if (alt == NULL) { 521 once++; 522 if (once > 1) { 523 break; 524 } 525 alt = TAILQ_FIRST(&stcb->asoc.nets); 526 } 527 /* sa_ignore NO_NULL_CHK */ 528 if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) && 529 (alt != net)) { 530 /* Found an alternate address */ 531 break; 532 } 533 mnet = alt; 534 } while (alt != NULL); 535 } 536 if (alt == NULL) { 537 return (net); 538 } 539 return (alt); 540 } 541 542 543 544 static void 545 sctp_backoff_on_timeout(struct sctp_tcb *stcb, 546 struct sctp_nets *net, 547 int win_probe, 548 int num_marked) 549 { 550 if (net->RTO == 0) { 551 net->RTO = stcb->asoc.minrto; 552 } 553 net->RTO <<= 1; 554 if (net->RTO > stcb->asoc.maxrto) { 555 net->RTO = stcb->asoc.maxrto; 556 } 557 if ((win_probe == 0) && num_marked) { 558 /* We don't apply penalty to window probe scenarios */ 559 /* JRS - Use the congestion control given in the CC module */ 560 stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net); 561 } 562 } 563 564 #ifndef INVARIANTS 565 static void 566 sctp_recover_sent_list(struct sctp_tcb *stcb) 567 { 568 struct sctp_tmit_chunk *chk, *tp2; 569 struct sctp_association *asoc; 570 571 asoc = &stcb->asoc; 572 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 573 for (; chk != NULL; chk = tp2) { 574 tp2 = TAILQ_NEXT(chk, sctp_next); 575 if ((compare_with_wrap(stcb->asoc.last_acked_seq, 576 chk->rec.data.TSN_seq, 577 MAX_TSN)) || 578 (stcb->asoc.last_acked_seq == chk->rec.data.TSN_seq)) { 579 580 SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n", 581 chk, chk->rec.data.TSN_seq, stcb->asoc.last_acked_seq); 582 TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next); 583 if (chk->pr_sctp_on) { 584 if (asoc->pr_sctp_cnt != 0) 585 asoc->pr_sctp_cnt--; 586 } 587 if (chk->data) { 588 /* sa_ignore NO_NULL_CHK */ 589 sctp_free_bufspace(stcb, asoc, chk, 1); 590 sctp_m_freem(chk->data); 591 if (PR_SCTP_BUF_ENABLED(chk->flags)) { 592 asoc->sent_queue_cnt_removeable--; 593 } 594 } 595 chk->data = NULL; 596 asoc->sent_queue_cnt--; 597 sctp_free_a_chunk(stcb, chk); 598 } 599 } 600 SCTP_PRINTF("after recover order is as follows\n"); 601 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 602 for (; chk != NULL; chk = tp2) { 603 tp2 = TAILQ_NEXT(chk, sctp_next); 604 SCTP_PRINTF("chk:%p TSN:%x\n", chk, chk->rec.data.TSN_seq); 605 } 606 } 607 608 #endif 609 610 static int 611 sctp_mark_all_for_resend(struct sctp_tcb *stcb, 612 struct sctp_nets *net, 613 struct sctp_nets *alt, 614 int window_probe, 615 int *num_marked) 616 { 617 618 /* 619 * Mark all chunks (well not all) that were sent to *net for 620 * retransmission. Move them to alt for there destination as well... 621 * We only mark chunks that have been outstanding long enough to 622 * have received feed-back. 623 */ 624 struct sctp_tmit_chunk *chk, *tp2, *could_be_sent = NULL; 625 struct sctp_nets *lnets; 626 struct timeval now, min_wait, tv; 627 int cur_rtt; 628 int audit_tf, num_mk, fir; 629 unsigned int cnt_mk; 630 uint32_t orig_flight, orig_tf; 631 uint32_t tsnlast, tsnfirst; 632 int recovery_cnt = 0; 633 634 635 /* none in flight now */ 636 audit_tf = 0; 637 fir = 0; 638 /* 639 * figure out how long a data chunk must be pending before we can 640 * mark it .. 641 */ 642 (void)SCTP_GETTIME_TIMEVAL(&now); 643 /* get cur rto in micro-seconds */ 644 cur_rtt = (((net->lastsa >> 2) + net->lastsv) >> 1); 645 cur_rtt *= 1000; 646 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_EARLYFR_LOGGING_ENABLE | SCTP_FR_LOGGING_ENABLE)) { 647 sctp_log_fr(cur_rtt, 648 stcb->asoc.peers_rwnd, 649 window_probe, 650 SCTP_FR_T3_MARK_TIME); 651 sctp_log_fr(net->flight_size, 652 SCTP_OS_TIMER_PENDING(&net->fr_timer.timer), 653 SCTP_OS_TIMER_ACTIVE(&net->fr_timer.timer), 654 SCTP_FR_CWND_REPORT); 655 sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT); 656 } 657 tv.tv_sec = cur_rtt / 1000000; 658 tv.tv_usec = cur_rtt % 1000000; 659 min_wait = now; 660 timevalsub(&min_wait, &tv); 661 if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) { 662 /* 663 * if we hit here, we don't have enough seconds on the clock 664 * to account for the RTO. We just let the lower seconds be 665 * the bounds and don't worry about it. This may mean we 666 * will mark a lot more than we should. 667 */ 668 min_wait.tv_sec = min_wait.tv_usec = 0; 669 } 670 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_EARLYFR_LOGGING_ENABLE | SCTP_FR_LOGGING_ENABLE)) { 671 sctp_log_fr(cur_rtt, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME); 672 sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME); 673 } 674 /* 675 * Our rwnd will be incorrect here since we are not adding back the 676 * cnt * mbuf but we will fix that down below. 677 */ 678 orig_flight = net->flight_size; 679 orig_tf = stcb->asoc.total_flight; 680 681 net->fast_retran_ip = 0; 682 /* Now on to each chunk */ 683 num_mk = cnt_mk = 0; 684 tsnfirst = tsnlast = 0; 685 #ifndef INVARIANTS 686 start_again: 687 #endif 688 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 689 for (; chk != NULL; chk = tp2) { 690 tp2 = TAILQ_NEXT(chk, sctp_next); 691 if ((compare_with_wrap(stcb->asoc.last_acked_seq, 692 chk->rec.data.TSN_seq, 693 MAX_TSN)) || 694 (stcb->asoc.last_acked_seq == chk->rec.data.TSN_seq)) { 695 /* Strange case our list got out of order? */ 696 SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x", 697 (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq); 698 recovery_cnt++; 699 #ifdef INVARIANTS 700 panic("last acked >= chk on sent-Q"); 701 #else 702 SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt); 703 sctp_recover_sent_list(stcb); 704 if (recovery_cnt < 10) { 705 goto start_again; 706 } else { 707 SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt); 708 } 709 #endif 710 } 711 if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) { 712 /* 713 * found one to mark: If it is less than 714 * DATAGRAM_ACKED it MUST not be a skipped or marked 715 * TSN but instead one that is either already set 716 * for retransmission OR one that needs 717 * retransmission. 718 */ 719 720 /* validate its been outstanding long enough */ 721 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_EARLYFR_LOGGING_ENABLE | SCTP_FR_LOGGING_ENABLE)) { 722 sctp_log_fr(chk->rec.data.TSN_seq, 723 chk->sent_rcv_time.tv_sec, 724 chk->sent_rcv_time.tv_usec, 725 SCTP_FR_T3_MARK_TIME); 726 } 727 if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) { 728 /* 729 * we have reached a chunk that was sent 730 * some seconds past our min.. forget it we 731 * will find no more to send. 732 */ 733 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_EARLYFR_LOGGING_ENABLE | SCTP_FR_LOGGING_ENABLE)) { 734 sctp_log_fr(0, 735 chk->sent_rcv_time.tv_sec, 736 chk->sent_rcv_time.tv_usec, 737 SCTP_FR_T3_STOPPED); 738 } 739 continue; 740 } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) && 741 (window_probe == 0)) { 742 /* 743 * we must look at the micro seconds to 744 * know. 745 */ 746 if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) { 747 /* 748 * ok it was sent after our boundary 749 * time. 750 */ 751 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_EARLYFR_LOGGING_ENABLE | SCTP_FR_LOGGING_ENABLE)) { 752 sctp_log_fr(0, 753 chk->sent_rcv_time.tv_sec, 754 chk->sent_rcv_time.tv_usec, 755 SCTP_FR_T3_STOPPED); 756 } 757 continue; 758 } 759 } 760 if (PR_SCTP_TTL_ENABLED(chk->flags)) { 761 /* Is it expired? */ 762 if ((now.tv_sec > chk->rec.data.timetodrop.tv_sec) || 763 ((chk->rec.data.timetodrop.tv_sec == now.tv_sec) && 764 (now.tv_usec > chk->rec.data.timetodrop.tv_usec))) { 765 /* Yes so drop it */ 766 if (chk->data) { 767 (void)sctp_release_pr_sctp_chunk(stcb, 768 chk, 769 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 770 &stcb->asoc.sent_queue, SCTP_SO_NOT_LOCKED); 771 } 772 } 773 continue; 774 } 775 if (PR_SCTP_RTX_ENABLED(chk->flags)) { 776 /* Has it been retransmitted tv_sec times? */ 777 if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) { 778 if (chk->data) { 779 (void)sctp_release_pr_sctp_chunk(stcb, 780 chk, 781 (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), 782 &stcb->asoc.sent_queue, SCTP_SO_NOT_LOCKED); 783 } 784 } 785 continue; 786 } 787 if (chk->sent < SCTP_DATAGRAM_RESEND) { 788 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 789 num_mk++; 790 if (fir == 0) { 791 fir = 1; 792 tsnfirst = chk->rec.data.TSN_seq; 793 } 794 tsnlast = chk->rec.data.TSN_seq; 795 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_EARLYFR_LOGGING_ENABLE | SCTP_FR_LOGGING_ENABLE)) { 796 sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count, 797 0, SCTP_FR_T3_MARKED); 798 } 799 if (chk->rec.data.chunk_was_revoked) { 800 /* deflate the cwnd */ 801 chk->whoTo->cwnd -= chk->book_size; 802 chk->rec.data.chunk_was_revoked = 0; 803 } 804 net->marked_retrans++; 805 stcb->asoc.marked_retrans++; 806 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 807 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO, 808 chk->whoTo->flight_size, 809 chk->book_size, 810 (uintptr_t) chk->whoTo, 811 chk->rec.data.TSN_seq); 812 } 813 sctp_flight_size_decrease(chk); 814 sctp_total_flight_decrease(stcb, chk); 815 stcb->asoc.peers_rwnd += chk->send_size; 816 stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh); 817 } 818 chk->sent = SCTP_DATAGRAM_RESEND; 819 SCTP_STAT_INCR(sctps_markedretrans); 820 821 /* reset the TSN for striking and other FR stuff */ 822 chk->rec.data.doing_fast_retransmit = 0; 823 /* Clear any time so NO RTT is being done */ 824 chk->do_rtt = 0; 825 if (alt != net) { 826 sctp_free_remote_addr(chk->whoTo); 827 chk->no_fr_allowed = 1; 828 chk->whoTo = alt; 829 atomic_add_int(&alt->ref_count, 1); 830 } else { 831 chk->no_fr_allowed = 0; 832 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 833 chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 834 } else { 835 chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 836 } 837 } 838 /* 839 * CMT: Do not allow FRs on retransmitted TSNs. 840 */ 841 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 1) { 842 chk->no_fr_allowed = 1; 843 } 844 } else if (chk->sent == SCTP_DATAGRAM_ACKED) { 845 /* remember highest acked one */ 846 could_be_sent = chk; 847 } 848 if (chk->sent == SCTP_DATAGRAM_RESEND) { 849 cnt_mk++; 850 } 851 } 852 if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) { 853 /* we did not subtract the same things? */ 854 audit_tf = 1; 855 } 856 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_EARLYFR_LOGGING_ENABLE | SCTP_FR_LOGGING_ENABLE)) { 857 sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT); 858 } 859 #ifdef SCTP_DEBUG 860 if (num_mk) { 861 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n", 862 tsnlast); 863 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n", 864 num_mk, (u_long)stcb->asoc.peers_rwnd); 865 SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n", 866 tsnlast); 867 SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n", 868 num_mk, 869 (int)stcb->asoc.peers_rwnd); 870 } 871 #endif 872 *num_marked = num_mk; 873 if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) { 874 /* fix it so we retransmit the highest acked anyway */ 875 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 876 cnt_mk++; 877 could_be_sent->sent = SCTP_DATAGRAM_RESEND; 878 } 879 if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) { 880 #ifdef INVARIANTS 881 SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n", 882 cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk); 883 #endif 884 #ifndef SCTP_AUDITING_ENABLED 885 stcb->asoc.sent_queue_retran_cnt = cnt_mk; 886 #endif 887 } 888 /* Now check for a ECN Echo that may be stranded */ 889 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 890 if ((chk->whoTo == net) && 891 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 892 sctp_free_remote_addr(chk->whoTo); 893 chk->whoTo = alt; 894 if (chk->sent != SCTP_DATAGRAM_RESEND) { 895 chk->sent = SCTP_DATAGRAM_RESEND; 896 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 897 } 898 atomic_add_int(&alt->ref_count, 1); 899 } 900 } 901 if (audit_tf) { 902 SCTPDBG(SCTP_DEBUG_TIMER4, 903 "Audit total flight due to negative value net:%p\n", 904 net); 905 stcb->asoc.total_flight = 0; 906 stcb->asoc.total_flight_count = 0; 907 /* Clear all networks flight size */ 908 TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) { 909 lnets->flight_size = 0; 910 SCTPDBG(SCTP_DEBUG_TIMER4, 911 "Net:%p c-f cwnd:%d ssthresh:%d\n", 912 lnets, lnets->cwnd, lnets->ssthresh); 913 } 914 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 915 if (chk->sent < SCTP_DATAGRAM_RESEND) { 916 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 917 sctp_misc_ints(SCTP_FLIGHT_LOG_UP, 918 chk->whoTo->flight_size, 919 chk->book_size, 920 (uintptr_t) chk->whoTo, 921 chk->rec.data.TSN_seq); 922 } 923 sctp_flight_size_increase(chk); 924 sctp_total_flight_increase(stcb, chk); 925 } 926 } 927 } 928 /* 929 * Setup the ecn nonce re-sync point. We do this since 930 * retranmissions are NOT setup for ECN. This means that do to 931 * Karn's rule, we don't know the total of the peers ecn bits. 932 */ 933 chk = TAILQ_FIRST(&stcb->asoc.send_queue); 934 if (chk == NULL) { 935 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 936 } else { 937 stcb->asoc.nonce_resync_tsn = chk->rec.data.TSN_seq; 938 } 939 stcb->asoc.nonce_wait_for_ecne = 0; 940 stcb->asoc.nonce_sum_check = 0; 941 /* We return 1 if we only have a window probe outstanding */ 942 return (0); 943 } 944 945 static void 946 sctp_move_all_chunks_to_alt(struct sctp_tcb *stcb, 947 struct sctp_nets *net, 948 struct sctp_nets *alt) 949 { 950 struct sctp_association *asoc; 951 struct sctp_stream_out *outs; 952 struct sctp_tmit_chunk *chk; 953 struct sctp_stream_queue_pending *sp; 954 955 if (net == alt) 956 /* nothing to do */ 957 return; 958 959 asoc = &stcb->asoc; 960 961 /* 962 * now through all the streams checking for chunks sent to our bad 963 * network. 964 */ 965 TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) { 966 /* now clean up any chunks here */ 967 TAILQ_FOREACH(sp, &outs->outqueue, next) { 968 if (sp->net == net) { 969 sctp_free_remote_addr(sp->net); 970 sp->net = alt; 971 atomic_add_int(&alt->ref_count, 1); 972 } 973 } 974 } 975 /* Now check the pending queue */ 976 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) { 977 if (chk->whoTo == net) { 978 sctp_free_remote_addr(chk->whoTo); 979 chk->whoTo = alt; 980 atomic_add_int(&alt->ref_count, 1); 981 } 982 } 983 984 } 985 986 int 987 sctp_t3rxt_timer(struct sctp_inpcb *inp, 988 struct sctp_tcb *stcb, 989 struct sctp_nets *net) 990 { 991 struct sctp_nets *alt; 992 int win_probe, num_mk; 993 994 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { 995 sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT); 996 } 997 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { 998 struct sctp_nets *lnet; 999 1000 TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) { 1001 if (net == lnet) { 1002 sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3); 1003 } else { 1004 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3); 1005 } 1006 } 1007 } 1008 /* Find an alternate and mark those for retransmission */ 1009 if ((stcb->asoc.peers_rwnd == 0) && 1010 (stcb->asoc.total_flight < net->mtu)) { 1011 SCTP_STAT_INCR(sctps_timowindowprobe); 1012 win_probe = 1; 1013 } else { 1014 win_probe = 0; 1015 } 1016 1017 /* 1018 * JRS 5/14/07 - If CMT PF is on and the destination if not already 1019 * in PF state, set the destination to PF state and store the 1020 * current time as the time that the destination was last active. In 1021 * addition, find an alternate destination with PF-based 1022 * find_alt_net(). 1023 */ 1024 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) { 1025 if ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF) { 1026 net->dest_state |= SCTP_ADDR_PF; 1027 net->last_active = sctp_get_tick_count(); 1028 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from active to PF.\n", 1029 net); 1030 } 1031 alt = sctp_find_alternate_net(stcb, net, 2); 1032 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { 1033 /* 1034 * CMT: Using RTX_SSTHRESH policy for CMT. If CMT is being 1035 * used, then pick dest with largest ssthresh for any 1036 * retransmission. 1037 */ 1038 alt = net; 1039 alt = sctp_find_alternate_net(stcb, alt, 1); 1040 /* 1041 * CUCv2: If a different dest is picked for the 1042 * retransmission, then new (rtx-)pseudo_cumack needs to be 1043 * tracked for orig dest. Let CUCv2 track new (rtx-) 1044 * pseudo-cumack always. 1045 */ 1046 net->find_pseudo_cumack = 1; 1047 net->find_rtx_pseudo_cumack = 1; 1048 } else { /* CMT is OFF */ 1049 alt = sctp_find_alternate_net(stcb, net, 0); 1050 } 1051 1052 (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe, &num_mk); 1053 /* FR Loss recovery just ended with the T3. */ 1054 stcb->asoc.fast_retran_loss_recovery = 0; 1055 1056 /* CMT FR loss recovery ended with the T3 */ 1057 net->fast_retran_loss_recovery = 0; 1058 1059 /* 1060 * setup the sat loss recovery that prevents satellite cwnd advance. 1061 */ 1062 stcb->asoc.sat_t3_loss_recovery = 1; 1063 stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq; 1064 1065 /* Backoff the timer and cwnd */ 1066 sctp_backoff_on_timeout(stcb, net, win_probe, num_mk); 1067 if (win_probe == 0) { 1068 /* We don't do normal threshold management on window probes */ 1069 if (sctp_threshold_management(inp, stcb, net, 1070 stcb->asoc.max_send_times)) { 1071 /* Association was destroyed */ 1072 return (1); 1073 } else { 1074 if (net != stcb->asoc.primary_destination) { 1075 /* send a immediate HB if our RTO is stale */ 1076 struct timeval now; 1077 unsigned int ms_goneby; 1078 1079 (void)SCTP_GETTIME_TIMEVAL(&now); 1080 if (net->last_sent_time.tv_sec) { 1081 ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000; 1082 } else { 1083 ms_goneby = 0; 1084 } 1085 if ((ms_goneby > net->RTO) || (net->RTO == 0)) { 1086 /* 1087 * no recent feed back in an RTO or 1088 * more, request a RTT update 1089 */ 1090 if (sctp_send_hb(stcb, 1, net) < 0) 1091 return 1; 1092 } 1093 } 1094 } 1095 } else { 1096 /* 1097 * For a window probe we don't penalize the net's but only 1098 * the association. This may fail it if SACKs are not coming 1099 * back. If sack's are coming with rwnd locked at 0, we will 1100 * continue to hold things waiting for rwnd to raise 1101 */ 1102 if (sctp_threshold_management(inp, stcb, NULL, 1103 stcb->asoc.max_send_times)) { 1104 /* Association was destroyed */ 1105 return (1); 1106 } 1107 } 1108 if (net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 1109 /* Move all pending over too */ 1110 sctp_move_all_chunks_to_alt(stcb, net, alt); 1111 1112 /* 1113 * Get the address that failed, to force a new src address 1114 * selecton and a route allocation. 1115 */ 1116 if (net->ro._s_addr) { 1117 sctp_free_ifa(net->ro._s_addr); 1118 net->ro._s_addr = NULL; 1119 } 1120 net->src_addr_selected = 0; 1121 1122 /* Force a route allocation too */ 1123 if (net->ro.ro_rt) { 1124 RTFREE(net->ro.ro_rt); 1125 net->ro.ro_rt = NULL; 1126 } 1127 /* Was it our primary? */ 1128 if ((stcb->asoc.primary_destination == net) && (alt != net)) { 1129 /* 1130 * Yes, note it as such and find an alternate note: 1131 * this means HB code must use this to resent the 1132 * primary if it goes active AND if someone does a 1133 * change-primary then this flag must be cleared 1134 * from any net structures. 1135 */ 1136 if (sctp_set_primary_addr(stcb, 1137 (struct sockaddr *)NULL, 1138 alt) == 0) { 1139 net->dest_state |= SCTP_ADDR_WAS_PRIMARY; 1140 } 1141 } 1142 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf) && (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) { 1143 /* 1144 * JRS 5/14/07 - If the destination hasn't failed completely 1145 * but is in PF state, a PF-heartbeat needs to be sent 1146 * manually. 1147 */ 1148 if (sctp_send_hb(stcb, 1, net) < 0) 1149 return 1; 1150 } 1151 /* 1152 * Special case for cookie-echo'ed case, we don't do output but must 1153 * await the COOKIE-ACK before retransmission 1154 */ 1155 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 1156 /* 1157 * Here we just reset the timer and start again since we 1158 * have not established the asoc 1159 */ 1160 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net); 1161 return (0); 1162 } 1163 if (stcb->asoc.peer_supports_prsctp) { 1164 struct sctp_tmit_chunk *lchk; 1165 1166 lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc); 1167 /* C3. See if we need to send a Fwd-TSN */ 1168 if (compare_with_wrap(stcb->asoc.advanced_peer_ack_point, 1169 stcb->asoc.last_acked_seq, MAX_TSN)) { 1170 /* 1171 * ISSUE with ECN, see FWD-TSN processing for notes 1172 * on issues that will occur when the ECN NONCE 1173 * stuff is put into SCTP for cross checking. 1174 */ 1175 send_forward_tsn(stcb, &stcb->asoc); 1176 if (lchk) { 1177 /* Assure a timer is up */ 1178 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo); 1179 } 1180 } 1181 } 1182 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) { 1183 sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX); 1184 } 1185 return (0); 1186 } 1187 1188 int 1189 sctp_t1init_timer(struct sctp_inpcb *inp, 1190 struct sctp_tcb *stcb, 1191 struct sctp_nets *net) 1192 { 1193 /* bump the thresholds */ 1194 if (stcb->asoc.delayed_connection) { 1195 /* 1196 * special hook for delayed connection. The library did NOT 1197 * complete the rest of its sends. 1198 */ 1199 stcb->asoc.delayed_connection = 0; 1200 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED); 1201 return (0); 1202 } 1203 if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) { 1204 return (0); 1205 } 1206 if (sctp_threshold_management(inp, stcb, net, 1207 stcb->asoc.max_init_times)) { 1208 /* Association was destroyed */ 1209 return (1); 1210 } 1211 stcb->asoc.dropped_special_cnt = 0; 1212 sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0); 1213 if (stcb->asoc.initial_init_rto_max < net->RTO) { 1214 net->RTO = stcb->asoc.initial_init_rto_max; 1215 } 1216 if (stcb->asoc.numnets > 1) { 1217 /* If we have more than one addr use it */ 1218 struct sctp_nets *alt; 1219 1220 alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0); 1221 if ((alt != NULL) && (alt != stcb->asoc.primary_destination)) { 1222 sctp_move_all_chunks_to_alt(stcb, stcb->asoc.primary_destination, alt); 1223 stcb->asoc.primary_destination = alt; 1224 } 1225 } 1226 /* Send out a new init */ 1227 sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED); 1228 return (0); 1229 } 1230 1231 /* 1232 * For cookie and asconf we actually need to find and mark for resend, then 1233 * increment the resend counter (after all the threshold management stuff of 1234 * course). 1235 */ 1236 int 1237 sctp_cookie_timer(struct sctp_inpcb *inp, 1238 struct sctp_tcb *stcb, 1239 struct sctp_nets *net) 1240 { 1241 struct sctp_nets *alt; 1242 struct sctp_tmit_chunk *cookie; 1243 1244 /* first before all else we must find the cookie */ 1245 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) { 1246 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 1247 break; 1248 } 1249 } 1250 if (cookie == NULL) { 1251 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 1252 /* FOOBAR! */ 1253 struct mbuf *oper; 1254 1255 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 1256 0, M_DONTWAIT, 1, MT_DATA); 1257 if (oper) { 1258 struct sctp_paramhdr *ph; 1259 uint32_t *ippp; 1260 1261 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + 1262 sizeof(uint32_t); 1263 ph = mtod(oper, struct sctp_paramhdr *); 1264 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); 1265 ph->param_length = htons(SCTP_BUF_LEN(oper)); 1266 ippp = (uint32_t *) (ph + 1); 1267 *ippp = htonl(SCTP_FROM_SCTP_TIMER + SCTP_LOC_3); 1268 } 1269 inp->last_abort_code = SCTP_FROM_SCTP_TIMER + SCTP_LOC_4; 1270 sctp_abort_an_association(inp, stcb, SCTP_INTERNAL_ERROR, 1271 oper, SCTP_SO_NOT_LOCKED); 1272 } else { 1273 #ifdef INVARIANTS 1274 panic("Cookie timer expires in wrong state?"); 1275 #else 1276 SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc)); 1277 return (0); 1278 #endif 1279 } 1280 return (0); 1281 } 1282 /* Ok we found the cookie, threshold management next */ 1283 if (sctp_threshold_management(inp, stcb, cookie->whoTo, 1284 stcb->asoc.max_init_times)) { 1285 /* Assoc is over */ 1286 return (1); 1287 } 1288 /* 1289 * cleared theshold management now lets backoff the address & select 1290 * an alternate 1291 */ 1292 stcb->asoc.dropped_special_cnt = 0; 1293 sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0); 1294 alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0); 1295 if (alt != cookie->whoTo) { 1296 sctp_free_remote_addr(cookie->whoTo); 1297 cookie->whoTo = alt; 1298 atomic_add_int(&alt->ref_count, 1); 1299 } 1300 /* Now mark the retran info */ 1301 if (cookie->sent != SCTP_DATAGRAM_RESEND) { 1302 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1303 } 1304 cookie->sent = SCTP_DATAGRAM_RESEND; 1305 /* 1306 * Now call the output routine to kick out the cookie again, Note we 1307 * don't mark any chunks for retran so that FR will need to kick in 1308 * to move these (or a send timer). 1309 */ 1310 return (0); 1311 } 1312 1313 int 1314 sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1315 struct sctp_nets *net) 1316 { 1317 struct sctp_nets *alt; 1318 struct sctp_tmit_chunk *strrst = NULL, *chk = NULL; 1319 1320 if (stcb->asoc.stream_reset_outstanding == 0) { 1321 return (0); 1322 } 1323 /* find the existing STRRESET, we use the seq number we sent out on */ 1324 (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst); 1325 if (strrst == NULL) { 1326 return (0); 1327 } 1328 /* do threshold management */ 1329 if (sctp_threshold_management(inp, stcb, strrst->whoTo, 1330 stcb->asoc.max_send_times)) { 1331 /* Assoc is over */ 1332 return (1); 1333 } 1334 /* 1335 * cleared theshold management now lets backoff the address & select 1336 * an alternate 1337 */ 1338 sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0); 1339 alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0); 1340 sctp_free_remote_addr(strrst->whoTo); 1341 strrst->whoTo = alt; 1342 atomic_add_int(&alt->ref_count, 1); 1343 1344 /* See if a ECN Echo is also stranded */ 1345 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 1346 if ((chk->whoTo == net) && 1347 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 1348 sctp_free_remote_addr(chk->whoTo); 1349 if (chk->sent != SCTP_DATAGRAM_RESEND) { 1350 chk->sent = SCTP_DATAGRAM_RESEND; 1351 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1352 } 1353 chk->whoTo = alt; 1354 atomic_add_int(&alt->ref_count, 1); 1355 } 1356 } 1357 if (net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 1358 /* 1359 * If the address went un-reachable, we need to move to 1360 * alternates for ALL chk's in queue 1361 */ 1362 sctp_move_all_chunks_to_alt(stcb, net, alt); 1363 } 1364 /* mark the retran info */ 1365 if (strrst->sent != SCTP_DATAGRAM_RESEND) 1366 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1367 strrst->sent = SCTP_DATAGRAM_RESEND; 1368 1369 /* restart the timer */ 1370 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo); 1371 return (0); 1372 } 1373 1374 int 1375 sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1376 struct sctp_nets *net) 1377 { 1378 struct sctp_nets *alt; 1379 struct sctp_tmit_chunk *asconf, *chk, *nchk; 1380 1381 /* is this a first send, or a retransmission? */ 1382 if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) { 1383 /* compose a new ASCONF chunk and send it */ 1384 sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED); 1385 } else { 1386 /* 1387 * Retransmission of the existing ASCONF is needed 1388 */ 1389 1390 /* find the existing ASCONF */ 1391 asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue); 1392 if (asconf == NULL) { 1393 return (0); 1394 } 1395 /* do threshold management */ 1396 if (sctp_threshold_management(inp, stcb, asconf->whoTo, 1397 stcb->asoc.max_send_times)) { 1398 /* Assoc is over */ 1399 return (1); 1400 } 1401 if (asconf->snd_count > stcb->asoc.max_send_times) { 1402 /* 1403 * Something is rotten: our peer is not responding 1404 * to ASCONFs but apparently is to other chunks. 1405 * i.e. it is not properly handling the chunk type 1406 * upper bits. Mark this peer as ASCONF incapable 1407 * and cleanup. 1408 */ 1409 SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n"); 1410 sctp_asconf_cleanup(stcb, net); 1411 return (0); 1412 } 1413 /* 1414 * cleared threshold management, so now backoff the net and 1415 * select an alternate 1416 */ 1417 sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0); 1418 alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0); 1419 if (asconf->whoTo != alt) { 1420 sctp_free_remote_addr(asconf->whoTo); 1421 asconf->whoTo = alt; 1422 atomic_add_int(&alt->ref_count, 1); 1423 } 1424 /* See if an ECN Echo is also stranded */ 1425 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 1426 if ((chk->whoTo == net) && 1427 (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) { 1428 sctp_free_remote_addr(chk->whoTo); 1429 chk->whoTo = alt; 1430 if (chk->sent != SCTP_DATAGRAM_RESEND) { 1431 chk->sent = SCTP_DATAGRAM_RESEND; 1432 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1433 } 1434 atomic_add_int(&alt->ref_count, 1); 1435 } 1436 } 1437 for (chk = asconf; chk; chk = nchk) { 1438 nchk = TAILQ_NEXT(chk, sctp_next); 1439 if (chk->whoTo != alt) { 1440 sctp_free_remote_addr(chk->whoTo); 1441 chk->whoTo = alt; 1442 atomic_add_int(&alt->ref_count, 1); 1443 } 1444 if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT) 1445 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1446 chk->sent = SCTP_DATAGRAM_RESEND; 1447 } 1448 if (net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 1449 /* 1450 * If the address went un-reachable, we need to move 1451 * to the alternate for ALL chunks in queue 1452 */ 1453 sctp_move_all_chunks_to_alt(stcb, net, alt); 1454 net = alt; 1455 } 1456 /* mark the retran info */ 1457 if (asconf->sent != SCTP_DATAGRAM_RESEND) 1458 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1459 asconf->sent = SCTP_DATAGRAM_RESEND; 1460 1461 /* send another ASCONF if any and we can do */ 1462 sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED); 1463 } 1464 return (0); 1465 } 1466 1467 /* Mobility adaptation */ 1468 void 1469 sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1470 struct sctp_nets *net) 1471 { 1472 if (stcb->asoc.deleted_primary == NULL) { 1473 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n"); 1474 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED); 1475 return; 1476 } 1477 SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary "); 1478 SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa); 1479 sctp_free_remote_addr(stcb->asoc.deleted_primary); 1480 stcb->asoc.deleted_primary = NULL; 1481 sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED); 1482 return; 1483 } 1484 1485 /* 1486 * For the shutdown and shutdown-ack, we do not keep one around on the 1487 * control queue. This means we must generate a new one and call the general 1488 * chunk output routine, AFTER having done threshold management. 1489 */ 1490 int 1491 sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1492 struct sctp_nets *net) 1493 { 1494 struct sctp_nets *alt; 1495 1496 /* first threshold managment */ 1497 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) { 1498 /* Assoc is over */ 1499 return (1); 1500 } 1501 /* second select an alternative */ 1502 alt = sctp_find_alternate_net(stcb, net, 0); 1503 1504 /* third generate a shutdown into the queue for out net */ 1505 if (alt) { 1506 sctp_send_shutdown(stcb, alt); 1507 } else { 1508 /* 1509 * if alt is NULL, there is no dest to send to?? 1510 */ 1511 return (0); 1512 } 1513 /* fourth restart timer */ 1514 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt); 1515 return (0); 1516 } 1517 1518 int 1519 sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1520 struct sctp_nets *net) 1521 { 1522 struct sctp_nets *alt; 1523 1524 /* first threshold managment */ 1525 if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) { 1526 /* Assoc is over */ 1527 return (1); 1528 } 1529 /* second select an alternative */ 1530 alt = sctp_find_alternate_net(stcb, net, 0); 1531 1532 /* third generate a shutdown into the queue for out net */ 1533 sctp_send_shutdown_ack(stcb, alt); 1534 1535 /* fourth restart timer */ 1536 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt); 1537 return (0); 1538 } 1539 1540 static void 1541 sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp, 1542 struct sctp_tcb *stcb) 1543 { 1544 struct sctp_stream_out *outs; 1545 struct sctp_stream_queue_pending *sp; 1546 unsigned int chks_in_queue = 0; 1547 int being_filled = 0; 1548 1549 /* 1550 * This function is ONLY called when the send/sent queues are empty. 1551 */ 1552 if ((stcb == NULL) || (inp == NULL)) 1553 return; 1554 1555 if (stcb->asoc.sent_queue_retran_cnt) { 1556 SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n", 1557 stcb->asoc.sent_queue_retran_cnt); 1558 stcb->asoc.sent_queue_retran_cnt = 0; 1559 } 1560 SCTP_TCB_SEND_LOCK(stcb); 1561 if (TAILQ_EMPTY(&stcb->asoc.out_wheel)) { 1562 int i, cnt = 0; 1563 1564 /* Check to see if a spoke fell off the wheel */ 1565 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1566 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 1567 sctp_insert_on_wheel(stcb, &stcb->asoc, &stcb->asoc.strmout[i], 1); 1568 cnt++; 1569 } 1570 } 1571 if (cnt) { 1572 /* yep, we lost a spoke or two */ 1573 SCTP_PRINTF("Found an additional %d streams NOT on outwheel, corrected\n", cnt); 1574 } else { 1575 /* no spokes lost, */ 1576 stcb->asoc.total_output_queue_size = 0; 1577 } 1578 SCTP_TCB_SEND_UNLOCK(stcb); 1579 return; 1580 } 1581 SCTP_TCB_SEND_UNLOCK(stcb); 1582 /* Check to see if some data queued, if so report it */ 1583 TAILQ_FOREACH(outs, &stcb->asoc.out_wheel, next_spoke) { 1584 if (!TAILQ_EMPTY(&outs->outqueue)) { 1585 TAILQ_FOREACH(sp, &outs->outqueue, next) { 1586 if (sp->msg_is_complete) 1587 being_filled++; 1588 chks_in_queue++; 1589 } 1590 } 1591 } 1592 if (chks_in_queue != stcb->asoc.stream_queue_cnt) { 1593 SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n", 1594 stcb->asoc.stream_queue_cnt, chks_in_queue); 1595 } 1596 if (chks_in_queue) { 1597 /* call the output queue function */ 1598 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED); 1599 if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) && 1600 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 1601 /* 1602 * Probably should go in and make it go back through 1603 * and add fragments allowed 1604 */ 1605 if (being_filled == 0) { 1606 SCTP_PRINTF("Still nothing moved %d chunks are stuck\n", 1607 chks_in_queue); 1608 } 1609 } 1610 } else { 1611 SCTP_PRINTF("Found no chunks on any queue tot:%lu\n", 1612 (u_long)stcb->asoc.total_output_queue_size); 1613 stcb->asoc.total_output_queue_size = 0; 1614 } 1615 } 1616 1617 int 1618 sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb, 1619 struct sctp_nets *net, int cnt_of_unconf) 1620 { 1621 int ret; 1622 1623 if (net) { 1624 if (net->hb_responded == 0) { 1625 if (net->ro._s_addr) { 1626 /* 1627 * Invalidate the src address if we did not 1628 * get a response last time. 1629 */ 1630 sctp_free_ifa(net->ro._s_addr); 1631 net->ro._s_addr = NULL; 1632 net->src_addr_selected = 0; 1633 } 1634 sctp_backoff_on_timeout(stcb, net, 1, 0); 1635 } 1636 /* Zero PBA, if it needs it */ 1637 if (net->partial_bytes_acked) { 1638 net->partial_bytes_acked = 0; 1639 } 1640 } 1641 if ((stcb->asoc.total_output_queue_size > 0) && 1642 (TAILQ_EMPTY(&stcb->asoc.send_queue)) && 1643 (TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 1644 sctp_audit_stream_queues_for_size(inp, stcb); 1645 } 1646 /* Send a new HB, this will do threshold managment, pick a new dest */ 1647 if (cnt_of_unconf == 0) { 1648 if (sctp_send_hb(stcb, 0, NULL) < 0) { 1649 return (1); 1650 } 1651 } else { 1652 /* 1653 * this will send out extra hb's up to maxburst if there are 1654 * any unconfirmed addresses. 1655 */ 1656 uint32_t cnt_sent = 0; 1657 1658 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1659 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 1660 (net->dest_state & SCTP_ADDR_REACHABLE)) { 1661 cnt_sent++; 1662 if (net->hb_responded == 0) { 1663 /* Did we respond last time? */ 1664 if (net->ro._s_addr) { 1665 sctp_free_ifa(net->ro._s_addr); 1666 net->ro._s_addr = NULL; 1667 net->src_addr_selected = 0; 1668 } 1669 } 1670 ret = sctp_send_hb(stcb, 1, net); 1671 if (ret < 0) 1672 return 1; 1673 else if (ret == 0) { 1674 break; 1675 } 1676 if (cnt_sent >= SCTP_BASE_SYSCTL(sctp_hb_maxburst)) 1677 break; 1678 } 1679 } 1680 } 1681 return (0); 1682 } 1683 1684 int 1685 sctp_is_hb_timer_running(struct sctp_tcb *stcb) 1686 { 1687 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.hb_timer.timer)) { 1688 /* its running */ 1689 return (1); 1690 } else { 1691 /* nope */ 1692 return (0); 1693 } 1694 } 1695 1696 int 1697 sctp_is_sack_timer_running(struct sctp_tcb *stcb) 1698 { 1699 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { 1700 /* its running */ 1701 return (1); 1702 } else { 1703 /* nope */ 1704 return (0); 1705 } 1706 } 1707 1708 #define SCTP_NUMBER_OF_MTU_SIZES 18 1709 static uint32_t mtu_sizes[] = { 1710 68, 1711 296, 1712 508, 1713 512, 1714 544, 1715 576, 1716 1006, 1717 1492, 1718 1500, 1719 1536, 1720 2002, 1721 2048, 1722 4352, 1723 4464, 1724 8166, 1725 17914, 1726 32000, 1727 65535 1728 }; 1729 1730 1731 static uint32_t 1732 sctp_getnext_mtu(struct sctp_inpcb *inp, uint32_t cur_mtu) 1733 { 1734 /* select another MTU that is just bigger than this one */ 1735 int i; 1736 1737 for (i = 0; i < SCTP_NUMBER_OF_MTU_SIZES; i++) { 1738 if (cur_mtu < mtu_sizes[i]) { 1739 /* no max_mtu is bigger than this one */ 1740 return (mtu_sizes[i]); 1741 } 1742 } 1743 /* here return the highest allowable */ 1744 return (cur_mtu); 1745 } 1746 1747 1748 void 1749 sctp_pathmtu_timer(struct sctp_inpcb *inp, 1750 struct sctp_tcb *stcb, 1751 struct sctp_nets *net) 1752 { 1753 uint32_t next_mtu, mtu; 1754 1755 next_mtu = sctp_getnext_mtu(inp, net->mtu); 1756 1757 if ((next_mtu > net->mtu) && (net->port == 0)) { 1758 if ((net->src_addr_selected == 0) || 1759 (net->ro._s_addr == NULL) || 1760 (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) { 1761 if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) { 1762 sctp_free_ifa(net->ro._s_addr); 1763 net->ro._s_addr = NULL; 1764 net->src_addr_selected = 0; 1765 } else if (net->ro._s_addr == NULL) { 1766 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE) 1767 if (net->ro._l_addr.sa.sa_family == AF_INET6) { 1768 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1769 1770 /* KAME hack: embed scopeid */ 1771 (void)sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone)); 1772 } 1773 #endif 1774 1775 net->ro._s_addr = sctp_source_address_selection(inp, 1776 stcb, 1777 (sctp_route_t *) & net->ro, 1778 net, 0, stcb->asoc.vrf_id); 1779 #if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE) 1780 if (net->ro._l_addr.sa.sa_family == AF_INET6) { 1781 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1782 1783 (void)sa6_recoverscope(sin6); 1784 } 1785 #endif /* INET6 */ 1786 } 1787 if (net->ro._s_addr) 1788 net->src_addr_selected = 1; 1789 } 1790 if (net->ro._s_addr) { 1791 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt); 1792 if (mtu > next_mtu) { 1793 net->mtu = next_mtu; 1794 } 1795 } 1796 } 1797 /* restart the timer */ 1798 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net); 1799 } 1800 1801 void 1802 sctp_autoclose_timer(struct sctp_inpcb *inp, 1803 struct sctp_tcb *stcb, 1804 struct sctp_nets *net) 1805 { 1806 struct timeval tn, *tim_touse; 1807 struct sctp_association *asoc; 1808 int ticks_gone_by; 1809 1810 (void)SCTP_GETTIME_TIMEVAL(&tn); 1811 if (stcb->asoc.sctp_autoclose_ticks && 1812 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1813 /* Auto close is on */ 1814 asoc = &stcb->asoc; 1815 /* pick the time to use */ 1816 if (asoc->time_last_rcvd.tv_sec > 1817 asoc->time_last_sent.tv_sec) { 1818 tim_touse = &asoc->time_last_rcvd; 1819 } else { 1820 tim_touse = &asoc->time_last_sent; 1821 } 1822 /* Now has long enough transpired to autoclose? */ 1823 ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec); 1824 if ((ticks_gone_by > 0) && 1825 (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) { 1826 /* 1827 * autoclose time has hit, call the output routine, 1828 * which should do nothing just to be SURE we don't 1829 * have hanging data. We can then safely check the 1830 * queues and know that we are clear to send 1831 * shutdown 1832 */ 1833 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED); 1834 /* Are we clean? */ 1835 if (TAILQ_EMPTY(&asoc->send_queue) && 1836 TAILQ_EMPTY(&asoc->sent_queue)) { 1837 /* 1838 * there is nothing queued to send, so I'm 1839 * done... 1840 */ 1841 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1842 /* only send SHUTDOWN 1st time thru */ 1843 sctp_send_shutdown(stcb, stcb->asoc.primary_destination); 1844 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 1845 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 1846 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 1847 } 1848 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); 1849 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 1850 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 1851 stcb->sctp_ep, stcb, 1852 asoc->primary_destination); 1853 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1854 stcb->sctp_ep, stcb, 1855 asoc->primary_destination); 1856 } 1857 } 1858 } else { 1859 /* 1860 * No auto close at this time, reset t-o to check 1861 * later 1862 */ 1863 int tmp; 1864 1865 /* fool the timer startup to use the time left */ 1866 tmp = asoc->sctp_autoclose_ticks; 1867 asoc->sctp_autoclose_ticks -= ticks_gone_by; 1868 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1869 net); 1870 /* restore the real tick value */ 1871 asoc->sctp_autoclose_ticks = tmp; 1872 } 1873 } 1874 } 1875 1876 void 1877 sctp_iterator_timer(struct sctp_iterator *it) 1878 { 1879 int iteration_count = 0; 1880 int inp_skip = 0; 1881 1882 /* 1883 * only one iterator can run at a time. This is the only way we can 1884 * cleanly pull ep's from underneath all the running interators when 1885 * a ep is freed. 1886 */ 1887 SCTP_ITERATOR_LOCK(); 1888 if (it->inp == NULL) { 1889 /* iterator is complete */ 1890 done_with_iterator: 1891 SCTP_ITERATOR_UNLOCK(); 1892 SCTP_INP_INFO_WLOCK(); 1893 TAILQ_REMOVE(&SCTP_BASE_INFO(iteratorhead), it, sctp_nxt_itr); 1894 /* stopping the callout is not needed, in theory */ 1895 SCTP_INP_INFO_WUNLOCK(); 1896 (void)SCTP_OS_TIMER_STOP(&it->tmr.timer); 1897 if (it->function_atend != NULL) { 1898 (*it->function_atend) (it->pointer, it->val); 1899 } 1900 SCTP_FREE(it, SCTP_M_ITER); 1901 return; 1902 } 1903 select_a_new_ep: 1904 SCTP_INP_WLOCK(it->inp); 1905 while (((it->pcb_flags) && 1906 ((it->inp->sctp_flags & it->pcb_flags) != it->pcb_flags)) || 1907 ((it->pcb_features) && 1908 ((it->inp->sctp_features & it->pcb_features) != it->pcb_features))) { 1909 /* endpoint flags or features don't match, so keep looking */ 1910 if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) { 1911 SCTP_INP_WUNLOCK(it->inp); 1912 goto done_with_iterator; 1913 } 1914 SCTP_INP_WUNLOCK(it->inp); 1915 it->inp = LIST_NEXT(it->inp, sctp_list); 1916 if (it->inp == NULL) { 1917 goto done_with_iterator; 1918 } 1919 SCTP_INP_WLOCK(it->inp); 1920 } 1921 if ((it->inp->inp_starting_point_for_iterator != NULL) && 1922 (it->inp->inp_starting_point_for_iterator != it)) { 1923 SCTP_PRINTF("Iterator collision, waiting for one at %p\n", 1924 it->inp); 1925 SCTP_INP_WUNLOCK(it->inp); 1926 goto start_timer_return; 1927 } 1928 /* mark the current iterator on the endpoint */ 1929 it->inp->inp_starting_point_for_iterator = it; 1930 SCTP_INP_WUNLOCK(it->inp); 1931 SCTP_INP_RLOCK(it->inp); 1932 /* now go through each assoc which is in the desired state */ 1933 if (it->done_current_ep == 0) { 1934 if (it->function_inp != NULL) 1935 inp_skip = (*it->function_inp) (it->inp, it->pointer, it->val); 1936 it->done_current_ep = 1; 1937 } 1938 if (it->stcb == NULL) { 1939 /* run the per instance function */ 1940 it->stcb = LIST_FIRST(&it->inp->sctp_asoc_list); 1941 } 1942 SCTP_INP_RUNLOCK(it->inp); 1943 if ((inp_skip) || it->stcb == NULL) { 1944 if (it->function_inp_end != NULL) { 1945 inp_skip = (*it->function_inp_end) (it->inp, 1946 it->pointer, 1947 it->val); 1948 } 1949 goto no_stcb; 1950 } 1951 if ((it->stcb) && 1952 (it->stcb->asoc.stcb_starting_point_for_iterator == it)) { 1953 it->stcb->asoc.stcb_starting_point_for_iterator = NULL; 1954 } 1955 while (it->stcb) { 1956 SCTP_TCB_LOCK(it->stcb); 1957 if (it->asoc_state && ((it->stcb->asoc.state & it->asoc_state) != it->asoc_state)) { 1958 /* not in the right state... keep looking */ 1959 SCTP_TCB_UNLOCK(it->stcb); 1960 goto next_assoc; 1961 } 1962 /* mark the current iterator on the assoc */ 1963 it->stcb->asoc.stcb_starting_point_for_iterator = it; 1964 /* see if we have limited out the iterator loop */ 1965 iteration_count++; 1966 if (iteration_count > SCTP_ITERATOR_MAX_AT_ONCE) { 1967 start_timer_return: 1968 /* set a timer to continue this later */ 1969 if (it->stcb) 1970 SCTP_TCB_UNLOCK(it->stcb); 1971 sctp_timer_start(SCTP_TIMER_TYPE_ITERATOR, 1972 (struct sctp_inpcb *)it, NULL, NULL); 1973 SCTP_ITERATOR_UNLOCK(); 1974 return; 1975 } 1976 /* run function on this one */ 1977 (*it->function_assoc) (it->inp, it->stcb, it->pointer, it->val); 1978 1979 /* 1980 * we lie here, it really needs to have its own type but 1981 * first I must verify that this won't effect things :-0 1982 */ 1983 if (it->no_chunk_output == 0) 1984 sctp_chunk_output(it->inp, it->stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED); 1985 1986 SCTP_TCB_UNLOCK(it->stcb); 1987 next_assoc: 1988 it->stcb = LIST_NEXT(it->stcb, sctp_tcblist); 1989 if (it->stcb == NULL) { 1990 if (it->function_inp_end != NULL) { 1991 inp_skip = (*it->function_inp_end) (it->inp, 1992 it->pointer, 1993 it->val); 1994 } 1995 } 1996 } 1997 no_stcb: 1998 /* done with all assocs on this endpoint, move on to next endpoint */ 1999 it->done_current_ep = 0; 2000 SCTP_INP_WLOCK(it->inp); 2001 it->inp->inp_starting_point_for_iterator = NULL; 2002 SCTP_INP_WUNLOCK(it->inp); 2003 if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) { 2004 it->inp = NULL; 2005 } else { 2006 SCTP_INP_INFO_RLOCK(); 2007 it->inp = LIST_NEXT(it->inp, sctp_list); 2008 SCTP_INP_INFO_RUNLOCK(); 2009 } 2010 if (it->inp == NULL) { 2011 goto done_with_iterator; 2012 } 2013 goto select_a_new_ep; 2014 } 2015