sctp_input.c revision 289570
1/*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 289570 2015-10-19 11:17:54Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_auth.h> 45#include <netinet/sctp_indata.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_bsd_addr.h> 48#include <netinet/sctp_timer.h> 49#include <netinet/sctp_crc32.h> 50#if defined(INET) || defined(INET6) 51#include <netinet/udp.h> 52#endif 53#include <sys/smp.h> 54 55 56 57static void 58sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59{ 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81} 82 83/* INIT handler */ 84static void 85sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91{ 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 mflowtype, mflowid, inp->fibnum, 190 vrf_id, port); 191 } 192 goto outnow; 193 } 194 if ((stcb != NULL) && 195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 197 sctp_send_shutdown_ack(stcb, NULL); 198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 199 } else { 200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 201 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 202 sh, cp, 203 mflowtype, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211} 212 213/* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217int 218sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221#endif 222) 223{ 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280} 281 282static int 283sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284{ 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322#ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325#endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 outs->state = SCTP_STREAM_CLOSED; 361 } 362 } 363 /* cut back the count */ 364 asoc->pre_open_streams = newcnt; 365 } 366 SCTP_TCB_SEND_UNLOCK(stcb); 367 asoc->streamoutcnt = asoc->pre_open_streams; 368 for (i = 0; i < asoc->streamoutcnt; i++) { 369 asoc->strmout[i].state = SCTP_STREAM_OPEN; 370 } 371 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 372 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 373 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 374 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 375 } 376 /* This is the next one we expect */ 377 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 378 379 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 380 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 381 382 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 383 /* open the requested streams */ 384 385 if (asoc->strmin != NULL) { 386 /* Free the old ones */ 387 struct sctp_queued_to_read *ctl, *nctl; 388 389 for (i = 0; i < asoc->streamincnt; i++) { 390 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 391 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 392 sctp_free_remote_addr(ctl->whoFrom); 393 ctl->whoFrom = NULL; 394 sctp_m_freem(ctl->data); 395 ctl->data = NULL; 396 sctp_free_a_readq(stcb, ctl); 397 } 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].stream_no = i; 415 asoc->strmin[i].last_sequence_delivered = 0xffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 asoc->strmin[i].delivery_started = 0; 418 } 419 /* 420 * load_address_from_init will put the addresses into the 421 * association when the COOKIE is processed or the INIT-ACK is 422 * processed. Both types of COOKIE's existing and new call this 423 * routine. It will remove addresses that are no longer in the 424 * association (for the restarting case where addresses are 425 * removed). Up front when the INIT arrives we will discard it if it 426 * is a restart and new addresses have been added. 427 */ 428 /* sa_ignore MEMLEAK */ 429 return (0); 430} 431 432/* 433 * INIT-ACK message processing/consumption returns value < 0 on error 434 */ 435static int 436sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 437 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 438 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 439 struct sctp_nets *net, int *abort_no_unlock, 440 uint8_t mflowtype, uint32_t mflowid, 441 uint32_t vrf_id) 442{ 443 struct sctp_association *asoc; 444 struct mbuf *op_err; 445 int retval, abort_flag; 446 uint32_t initack_limit; 447 int nat_friendly = 0; 448 449 /* First verify that we have no illegal param's */ 450 abort_flag = 0; 451 452 op_err = sctp_arethere_unrecognized_parameters(m, 453 (offset + sizeof(struct sctp_init_chunk)), 454 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 455 if (abort_flag) { 456 /* Send an abort and notify peer */ 457 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 458 *abort_no_unlock = 1; 459 return (-1); 460 } 461 asoc = &stcb->asoc; 462 asoc->peer_supports_nat = (uint8_t) nat_friendly; 463 /* process the peer's parameters in the INIT-ACK */ 464 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 465 if (retval < 0) { 466 return (retval); 467 } 468 initack_limit = offset + ntohs(cp->ch.chunk_length); 469 /* load all addresses */ 470 if ((retval = sctp_load_addresses_from_init(stcb, m, 471 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 472 src, dst, NULL))) { 473 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 474 "Problem with address parameters"); 475 SCTPDBG(SCTP_DEBUG_INPUT1, 476 "Load addresses from INIT causes an abort %d\n", 477 retval); 478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 479 src, dst, sh, op_err, 480 mflowtype, mflowid, 481 vrf_id, net->port); 482 *abort_no_unlock = 1; 483 return (-1); 484 } 485 /* if the peer doesn't support asconf, flush the asconf queue */ 486 if (asoc->asconf_supported == 0) { 487 struct sctp_asconf_addr *param, *nparam; 488 489 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 490 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 491 SCTP_FREE(param, SCTP_M_ASC_ADDR); 492 } 493 } 494 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 495 stcb->asoc.local_hmacs); 496 if (op_err) { 497 sctp_queue_op_err(stcb, op_err); 498 /* queuing will steal away the mbuf chain to the out queue */ 499 op_err = NULL; 500 } 501 /* extract the cookie and queue it to "echo" it back... */ 502 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 503 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 504 stcb->asoc.overall_error_count, 505 0, 506 SCTP_FROM_SCTP_INPUT, 507 __LINE__); 508 } 509 stcb->asoc.overall_error_count = 0; 510 net->error_count = 0; 511 512 /* 513 * Cancel the INIT timer, We do this first before queueing the 514 * cookie. We always cancel at the primary to assue that we are 515 * canceling the timer started by the INIT which always goes to the 516 * primary. 517 */ 518 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 519 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 520 521 /* calculate the RTO */ 522 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 523 SCTP_RTT_FROM_NON_DATA); 524 525 retval = sctp_send_cookie_echo(m, offset, stcb, net); 526 if (retval < 0) { 527 /* 528 * No cookie, we probably should send a op error. But in any 529 * case if there is no cookie in the INIT-ACK, we can 530 * abandon the peer, its broke. 531 */ 532 if (retval == -3) { 533 uint16_t len; 534 535 len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 536 /* We abort with an error of missing mandatory param */ 537 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 538 if (op_err != NULL) { 539 struct sctp_error_missing_param *cause; 540 541 SCTP_BUF_LEN(op_err) = len; 542 cause = mtod(op_err, struct sctp_error_missing_param *); 543 /* Subtract the reserved param */ 544 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 545 cause->cause.length = htons(len); 546 cause->num_missing_params = htonl(1); 547 cause->type[0] = htons(SCTP_STATE_COOKIE); 548 } 549 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 550 src, dst, sh, op_err, 551 mflowtype, mflowid, 552 vrf_id, net->port); 553 *abort_no_unlock = 1; 554 } 555 return (retval); 556 } 557 return (0); 558} 559 560static void 561sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 562 struct sctp_tcb *stcb, struct sctp_nets *net) 563{ 564 union sctp_sockstore store; 565 struct sctp_nets *r_net, *f_net; 566 struct timeval tv; 567 int req_prim = 0; 568 uint16_t old_error_counter; 569 570 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 571 /* Invalid length */ 572 return; 573 } 574 memset(&store, 0, sizeof(store)); 575 switch (cp->heartbeat.hb_info.addr_family) { 576#ifdef INET 577 case AF_INET: 578 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 579 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 580 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 581 store.sin.sin_port = stcb->rport; 582 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 583 sizeof(store.sin.sin_addr)); 584 } else { 585 return; 586 } 587 break; 588#endif 589#ifdef INET6 590 case AF_INET6: 591 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 592 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 593 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 594 store.sin6.sin6_port = stcb->rport; 595 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 596 } else { 597 return; 598 } 599 break; 600#endif 601 default: 602 return; 603 } 604 r_net = sctp_findnet(stcb, &store.sa); 605 if (r_net == NULL) { 606 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 607 return; 608 } 609 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 610 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 611 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 612 /* 613 * If the its a HB and it's random value is correct when can 614 * confirm the destination. 615 */ 616 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 617 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 618 stcb->asoc.primary_destination = r_net; 619 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 620 f_net = TAILQ_FIRST(&stcb->asoc.nets); 621 if (f_net != r_net) { 622 /* 623 * first one on the list is NOT the primary 624 * sctp_cmpaddr() is much more efficent if 625 * the primary is the first on the list, 626 * make it so. 627 */ 628 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 629 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 630 } 631 req_prim = 1; 632 } 633 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 634 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 635 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 636 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 old_error_counter = r_net->error_count; 640 r_net->error_count = 0; 641 r_net->hb_responded = 1; 642 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 643 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 644 /* Now lets do a RTO with this */ 645 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 646 SCTP_RTT_FROM_NON_DATA); 647 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 648 r_net->dest_state |= SCTP_ADDR_REACHABLE; 649 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 650 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 651 } 652 if (r_net->dest_state & SCTP_ADDR_PF) { 653 r_net->dest_state &= ~SCTP_ADDR_PF; 654 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 655 } 656 if (old_error_counter > 0) { 657 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 658 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 659 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 660 } 661 if (r_net == stcb->asoc.primary_destination) { 662 if (stcb->asoc.alternate) { 663 /* release the alternate, primary is good */ 664 sctp_free_remote_addr(stcb->asoc.alternate); 665 stcb->asoc.alternate = NULL; 666 } 667 } 668 /* Mobility adaptation */ 669 if (req_prim) { 670 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 671 SCTP_MOBILITY_BASE) || 672 sctp_is_mobility_feature_on(stcb->sctp_ep, 673 SCTP_MOBILITY_FASTHANDOFF)) && 674 sctp_is_mobility_feature_on(stcb->sctp_ep, 675 SCTP_MOBILITY_PRIM_DELETED)) { 676 677 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 678 stcb->sctp_ep, stcb, NULL, 679 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 680 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 681 SCTP_MOBILITY_FASTHANDOFF)) { 682 sctp_assoc_immediate_retrans(stcb, 683 stcb->asoc.primary_destination); 684 } 685 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 686 SCTP_MOBILITY_BASE)) { 687 sctp_move_chunks_from_net(stcb, 688 stcb->asoc.deleted_primary); 689 } 690 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 691 stcb->asoc.deleted_primary); 692 } 693 } 694} 695 696static int 697sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 698{ 699 /* 700 * return 0 means we want you to proceed with the abort non-zero 701 * means no abort processing 702 */ 703 struct sctpasochead *head; 704 705 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 706 /* generate a new vtag and send init */ 707 LIST_REMOVE(stcb, sctp_asocs); 708 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 709 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 710 /* 711 * put it in the bucket in the vtag hash of assoc's for the 712 * system 713 */ 714 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 715 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 716 return (1); 717 } 718 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 719 /* 720 * treat like a case where the cookie expired i.e.: - dump 721 * current cookie. - generate a new vtag. - resend init. 722 */ 723 /* generate a new vtag and send init */ 724 LIST_REMOVE(stcb, sctp_asocs); 725 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 726 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 727 sctp_stop_all_cookie_timers(stcb); 728 sctp_toss_old_cookies(stcb, &stcb->asoc); 729 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 730 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 731 /* 732 * put it in the bucket in the vtag hash of assoc's for the 733 * system 734 */ 735 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 736 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 737 return (1); 738 } 739 return (0); 740} 741 742static int 743sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 744 struct sctp_nets *net) 745{ 746 /* 747 * return 0 means we want you to proceed with the abort non-zero 748 * means no abort processing 749 */ 750 if (stcb->asoc.auth_supported == 0) { 751 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 752 return (0); 753 } 754 sctp_asconf_send_nat_state_update(stcb, net); 755 return (1); 756} 757 758 759static void 760sctp_handle_abort(struct sctp_abort_chunk *abort, 761 struct sctp_tcb *stcb, struct sctp_nets *net) 762{ 763#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 764 struct socket *so; 765 766#endif 767 uint16_t len; 768 uint16_t error; 769 770 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 771 if (stcb == NULL) 772 return; 773 774 len = ntohs(abort->ch.chunk_length); 775 if (len > sizeof(struct sctp_chunkhdr)) { 776 /* 777 * Need to check the cause codes for our two magic nat 778 * aborts which don't kill the assoc necessarily. 779 */ 780 struct sctp_gen_error_cause *cause; 781 782 cause = (struct sctp_gen_error_cause *)(abort + 1); 783 error = ntohs(cause->code); 784 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 785 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 786 abort->ch.chunk_flags); 787 if (sctp_handle_nat_colliding_state(stcb)) { 788 return; 789 } 790 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 791 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 792 abort->ch.chunk_flags); 793 if (sctp_handle_nat_missing_state(stcb, net)) { 794 return; 795 } 796 } 797 } else { 798 error = 0; 799 } 800 /* stop any receive timers */ 801 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 802 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 803 /* notify user of the abort and clean up... */ 804 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 805 /* free the tcb */ 806 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 807 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 808 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 809 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 810 } 811#ifdef SCTP_ASOCLOG_OF_TSNS 812 sctp_print_out_track_log(stcb); 813#endif 814#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 815 so = SCTP_INP_SO(stcb->sctp_ep); 816 atomic_add_int(&stcb->asoc.refcnt, 1); 817 SCTP_TCB_UNLOCK(stcb); 818 SCTP_SOCKET_LOCK(so, 1); 819 SCTP_TCB_LOCK(stcb); 820 atomic_subtract_int(&stcb->asoc.refcnt, 1); 821#endif 822 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 823 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 824 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 825#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 826 SCTP_SOCKET_UNLOCK(so, 1); 827#endif 828 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 829} 830 831static void 832sctp_start_net_timers(struct sctp_tcb *stcb) 833{ 834 uint32_t cnt_hb_sent; 835 struct sctp_nets *net; 836 837 cnt_hb_sent = 0; 838 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 839 /* 840 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 841 * If the dest in unconfirmed send a hb as well if under 842 * max_hb_burst have been sent. 843 */ 844 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 845 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 846 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 847 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 848 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 849 cnt_hb_sent++; 850 } 851 } 852 if (cnt_hb_sent) { 853 sctp_chunk_output(stcb->sctp_ep, stcb, 854 SCTP_OUTPUT_FROM_COOKIE_ACK, 855 SCTP_SO_NOT_LOCKED); 856 } 857} 858 859 860static void 861sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 862 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 863{ 864 struct sctp_association *asoc; 865 int some_on_streamwheel; 866 int old_state; 867 868#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 869 struct socket *so; 870 871#endif 872 873 SCTPDBG(SCTP_DEBUG_INPUT2, 874 "sctp_handle_shutdown: handling SHUTDOWN\n"); 875 if (stcb == NULL) 876 return; 877 asoc = &stcb->asoc; 878 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 879 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 880 return; 881 } 882 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 883 /* Shutdown NOT the expected size */ 884 return; 885 } 886 old_state = SCTP_GET_STATE(asoc); 887 sctp_update_acked(stcb, cp, abort_flag); 888 if (*abort_flag) { 889 return; 890 } 891 if (asoc->control_pdapi) { 892 /* 893 * With a normal shutdown we assume the end of last record. 894 */ 895 SCTP_INP_READ_LOCK(stcb->sctp_ep); 896 asoc->control_pdapi->end_added = 1; 897 asoc->control_pdapi->pdapi_aborted = 1; 898 asoc->control_pdapi = NULL; 899 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 900#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 901 so = SCTP_INP_SO(stcb->sctp_ep); 902 atomic_add_int(&stcb->asoc.refcnt, 1); 903 SCTP_TCB_UNLOCK(stcb); 904 SCTP_SOCKET_LOCK(so, 1); 905 SCTP_TCB_LOCK(stcb); 906 atomic_subtract_int(&stcb->asoc.refcnt, 1); 907 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 908 /* assoc was freed while we were unlocked */ 909 SCTP_SOCKET_UNLOCK(so, 1); 910 return; 911 } 912#endif 913 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 914#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 915 SCTP_SOCKET_UNLOCK(so, 1); 916#endif 917 } 918 /* goto SHUTDOWN_RECEIVED state to block new requests */ 919 if (stcb->sctp_socket) { 920 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 921 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 922 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 923 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 924 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 925 /* 926 * notify upper layer that peer has initiated a 927 * shutdown 928 */ 929 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 930 931 /* reset time */ 932 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 933 } 934 } 935 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 936 /* 937 * stop the shutdown timer, since we WILL move to 938 * SHUTDOWN-ACK-SENT. 939 */ 940 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 941 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 942 } 943 /* Now is there unsent data on a stream somewhere? */ 944 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 945 946 if (!TAILQ_EMPTY(&asoc->send_queue) || 947 !TAILQ_EMPTY(&asoc->sent_queue) || 948 some_on_streamwheel) { 949 /* By returning we will push more data out */ 950 return; 951 } else { 952 /* no outstanding data to send, so move on... */ 953 /* send SHUTDOWN-ACK */ 954 /* move to SHUTDOWN-ACK-SENT state */ 955 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 956 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 957 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 958 } 959 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 960 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 961 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 962 sctp_stop_timers_for_shutdown(stcb); 963 sctp_send_shutdown_ack(stcb, net); 964 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 965 stcb->sctp_ep, stcb, net); 966 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 967 sctp_send_shutdown_ack(stcb, net); 968 } 969 } 970} 971 972static void 973sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 974 struct sctp_tcb *stcb, 975 struct sctp_nets *net) 976{ 977 struct sctp_association *asoc; 978 979#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 980 struct socket *so; 981 982 so = SCTP_INP_SO(stcb->sctp_ep); 983#endif 984 SCTPDBG(SCTP_DEBUG_INPUT2, 985 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 986 if (stcb == NULL) 987 return; 988 989 asoc = &stcb->asoc; 990 /* process according to association state */ 991 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 992 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 993 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 994 sctp_send_shutdown_complete(stcb, net, 1); 995 SCTP_TCB_UNLOCK(stcb); 996 return; 997 } 998 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 999 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1000 /* unexpected SHUTDOWN-ACK... so ignore... */ 1001 SCTP_TCB_UNLOCK(stcb); 1002 return; 1003 } 1004 if (asoc->control_pdapi) { 1005 /* 1006 * With a normal shutdown we assume the end of last record. 1007 */ 1008 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1009 asoc->control_pdapi->end_added = 1; 1010 asoc->control_pdapi->pdapi_aborted = 1; 1011 asoc->control_pdapi = NULL; 1012 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1013#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1014 atomic_add_int(&stcb->asoc.refcnt, 1); 1015 SCTP_TCB_UNLOCK(stcb); 1016 SCTP_SOCKET_LOCK(so, 1); 1017 SCTP_TCB_LOCK(stcb); 1018 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1019 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1020 /* assoc was freed while we were unlocked */ 1021 SCTP_SOCKET_UNLOCK(so, 1); 1022 return; 1023 } 1024#endif 1025 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1026#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1027 SCTP_SOCKET_UNLOCK(so, 1); 1028#endif 1029 } 1030#ifdef INVARIANTS 1031 if (!TAILQ_EMPTY(&asoc->send_queue) || 1032 !TAILQ_EMPTY(&asoc->sent_queue) || 1033 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1034 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1035 } 1036#endif 1037 /* stop the timer */ 1038 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1039 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1040 /* send SHUTDOWN-COMPLETE */ 1041 sctp_send_shutdown_complete(stcb, net, 0); 1042 /* notify upper layer protocol */ 1043 if (stcb->sctp_socket) { 1044 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1045 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1046 stcb->sctp_socket->so_snd.sb_cc = 0; 1047 } 1048 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1049 } 1050 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1051 /* free the TCB but first save off the ep */ 1052#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1053 atomic_add_int(&stcb->asoc.refcnt, 1); 1054 SCTP_TCB_UNLOCK(stcb); 1055 SCTP_SOCKET_LOCK(so, 1); 1056 SCTP_TCB_LOCK(stcb); 1057 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1058#endif 1059 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1060 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1061#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1062 SCTP_SOCKET_UNLOCK(so, 1); 1063#endif 1064} 1065 1066/* 1067 * Skip past the param header and then we will find the chunk that caused the 1068 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1069 * our peer must be broken. 1070 */ 1071static void 1072sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1073 struct sctp_nets *net) 1074{ 1075 struct sctp_chunkhdr *chk; 1076 1077 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1078 switch (chk->chunk_type) { 1079 case SCTP_ASCONF_ACK: 1080 case SCTP_ASCONF: 1081 sctp_asconf_cleanup(stcb, net); 1082 break; 1083 case SCTP_FORWARD_CUM_TSN: 1084 stcb->asoc.prsctp_supported = 0; 1085 break; 1086 default: 1087 SCTPDBG(SCTP_DEBUG_INPUT2, 1088 "Peer does not support chunk type %d(%x)??\n", 1089 chk->chunk_type, (uint32_t) chk->chunk_type); 1090 break; 1091 } 1092} 1093 1094/* 1095 * Skip past the param header and then we will find the param that caused the 1096 * problem. There are a number of param's in a ASCONF OR the prsctp param 1097 * these will turn of specific features. 1098 * XXX: Is this the right thing to do? 1099 */ 1100static void 1101sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1102{ 1103 struct sctp_paramhdr *pbad; 1104 1105 pbad = phdr + 1; 1106 switch (ntohs(pbad->param_type)) { 1107 /* pr-sctp draft */ 1108 case SCTP_PRSCTP_SUPPORTED: 1109 stcb->asoc.prsctp_supported = 0; 1110 break; 1111 case SCTP_SUPPORTED_CHUNK_EXT: 1112 break; 1113 /* draft-ietf-tsvwg-addip-sctp */ 1114 case SCTP_HAS_NAT_SUPPORT: 1115 stcb->asoc.peer_supports_nat = 0; 1116 break; 1117 case SCTP_ADD_IP_ADDRESS: 1118 case SCTP_DEL_IP_ADDRESS: 1119 case SCTP_SET_PRIM_ADDR: 1120 stcb->asoc.asconf_supported = 0; 1121 break; 1122 case SCTP_SUCCESS_REPORT: 1123 case SCTP_ERROR_CAUSE_IND: 1124 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1125 SCTPDBG(SCTP_DEBUG_INPUT2, 1126 "Turning off ASCONF to this strange peer\n"); 1127 stcb->asoc.asconf_supported = 0; 1128 break; 1129 default: 1130 SCTPDBG(SCTP_DEBUG_INPUT2, 1131 "Peer does not support param type %d(%x)??\n", 1132 pbad->param_type, (uint32_t) pbad->param_type); 1133 break; 1134 } 1135} 1136 1137static int 1138sctp_handle_error(struct sctp_chunkhdr *ch, 1139 struct sctp_tcb *stcb, struct sctp_nets *net) 1140{ 1141 int chklen; 1142 struct sctp_paramhdr *phdr; 1143 uint16_t error, error_type; 1144 uint16_t error_len; 1145 struct sctp_association *asoc; 1146 int adjust; 1147 1148#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1149 struct socket *so; 1150 1151#endif 1152 1153 /* parse through all of the errors and process */ 1154 asoc = &stcb->asoc; 1155 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1156 sizeof(struct sctp_chunkhdr)); 1157 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1158 error = 0; 1159 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1160 /* Process an Error Cause */ 1161 error_type = ntohs(phdr->param_type); 1162 error_len = ntohs(phdr->param_length); 1163 if ((error_len > chklen) || (error_len == 0)) { 1164 /* invalid param length for this param */ 1165 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1166 chklen, error_len); 1167 return (0); 1168 } 1169 if (error == 0) { 1170 /* report the first error cause */ 1171 error = error_type; 1172 } 1173 switch (error_type) { 1174 case SCTP_CAUSE_INVALID_STREAM: 1175 case SCTP_CAUSE_MISSING_PARAM: 1176 case SCTP_CAUSE_INVALID_PARAM: 1177 case SCTP_CAUSE_NO_USER_DATA: 1178 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1179 error_type); 1180 break; 1181 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1182 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1183 ch->chunk_flags); 1184 if (sctp_handle_nat_colliding_state(stcb)) { 1185 return (0); 1186 } 1187 break; 1188 case SCTP_CAUSE_NAT_MISSING_STATE: 1189 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1190 ch->chunk_flags); 1191 if (sctp_handle_nat_missing_state(stcb, net)) { 1192 return (0); 1193 } 1194 break; 1195 case SCTP_CAUSE_STALE_COOKIE: 1196 /* 1197 * We only act if we have echoed a cookie and are 1198 * waiting. 1199 */ 1200 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1201 int *p; 1202 1203 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1204 /* Save the time doubled */ 1205 asoc->cookie_preserve_req = ntohl(*p) << 1; 1206 asoc->stale_cookie_count++; 1207 if (asoc->stale_cookie_count > 1208 asoc->max_init_times) { 1209 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1210 /* now free the asoc */ 1211#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1212 so = SCTP_INP_SO(stcb->sctp_ep); 1213 atomic_add_int(&stcb->asoc.refcnt, 1); 1214 SCTP_TCB_UNLOCK(stcb); 1215 SCTP_SOCKET_LOCK(so, 1); 1216 SCTP_TCB_LOCK(stcb); 1217 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1218#endif 1219 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1220 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1221#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1222 SCTP_SOCKET_UNLOCK(so, 1); 1223#endif 1224 return (-1); 1225 } 1226 /* blast back to INIT state */ 1227 sctp_toss_old_cookies(stcb, &stcb->asoc); 1228 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1229 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1230 sctp_stop_all_cookie_timers(stcb); 1231 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1232 } 1233 break; 1234 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1235 /* 1236 * Nothing we can do here, we don't do hostname 1237 * addresses so if the peer does not like my IPv6 1238 * (or IPv4 for that matter) it does not matter. If 1239 * they don't support that type of address, they can 1240 * NOT possibly get that packet type... i.e. with no 1241 * IPv6 you can't recieve a IPv6 packet. so we can 1242 * safely ignore this one. If we ever added support 1243 * for HOSTNAME Addresses, then we would need to do 1244 * something here. 1245 */ 1246 break; 1247 case SCTP_CAUSE_UNRECOG_CHUNK: 1248 sctp_process_unrecog_chunk(stcb, phdr, net); 1249 break; 1250 case SCTP_CAUSE_UNRECOG_PARAM: 1251 sctp_process_unrecog_param(stcb, phdr); 1252 break; 1253 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1254 /* 1255 * We ignore this since the timer will drive out a 1256 * new cookie anyway and there timer will drive us 1257 * to send a SHUTDOWN_COMPLETE. We can't send one 1258 * here since we don't have their tag. 1259 */ 1260 break; 1261 case SCTP_CAUSE_DELETING_LAST_ADDR: 1262 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1263 case SCTP_CAUSE_DELETING_SRC_ADDR: 1264 /* 1265 * We should NOT get these here, but in a 1266 * ASCONF-ACK. 1267 */ 1268 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1269 error_type); 1270 break; 1271 case SCTP_CAUSE_OUT_OF_RESC: 1272 /* 1273 * And what, pray tell do we do with the fact that 1274 * the peer is out of resources? Not really sure we 1275 * could do anything but abort. I suspect this 1276 * should have came WITH an abort instead of in a 1277 * OP-ERROR. 1278 */ 1279 break; 1280 default: 1281 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1282 error_type); 1283 break; 1284 } 1285 adjust = SCTP_SIZE32(error_len); 1286 chklen -= adjust; 1287 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1288 } 1289 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1290 return (0); 1291} 1292 1293static int 1294sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1295 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1296 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1297 struct sctp_nets *net, int *abort_no_unlock, 1298 uint8_t mflowtype, uint32_t mflowid, 1299 uint32_t vrf_id) 1300{ 1301 struct sctp_init_ack *init_ack; 1302 struct mbuf *op_err; 1303 1304 SCTPDBG(SCTP_DEBUG_INPUT2, 1305 "sctp_handle_init_ack: handling INIT-ACK\n"); 1306 1307 if (stcb == NULL) { 1308 SCTPDBG(SCTP_DEBUG_INPUT2, 1309 "sctp_handle_init_ack: TCB is null\n"); 1310 return (-1); 1311 } 1312 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1313 /* Invalid length */ 1314 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1315 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1316 src, dst, sh, op_err, 1317 mflowtype, mflowid, 1318 vrf_id, net->port); 1319 *abort_no_unlock = 1; 1320 return (-1); 1321 } 1322 init_ack = &cp->init; 1323 /* validate parameters */ 1324 if (init_ack->initiate_tag == 0) { 1325 /* protocol error... send an abort */ 1326 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1327 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1328 src, dst, sh, op_err, 1329 mflowtype, mflowid, 1330 vrf_id, net->port); 1331 *abort_no_unlock = 1; 1332 return (-1); 1333 } 1334 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1335 /* protocol error... send an abort */ 1336 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1337 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1338 src, dst, sh, op_err, 1339 mflowtype, mflowid, 1340 vrf_id, net->port); 1341 *abort_no_unlock = 1; 1342 return (-1); 1343 } 1344 if (init_ack->num_inbound_streams == 0) { 1345 /* protocol error... send an abort */ 1346 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1347 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1348 src, dst, sh, op_err, 1349 mflowtype, mflowid, 1350 vrf_id, net->port); 1351 *abort_no_unlock = 1; 1352 return (-1); 1353 } 1354 if (init_ack->num_outbound_streams == 0) { 1355 /* protocol error... send an abort */ 1356 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1357 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1358 src, dst, sh, op_err, 1359 mflowtype, mflowid, 1360 vrf_id, net->port); 1361 *abort_no_unlock = 1; 1362 return (-1); 1363 } 1364 /* process according to association state... */ 1365 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1366 case SCTP_STATE_COOKIE_WAIT: 1367 /* this is the expected state for this chunk */ 1368 /* process the INIT-ACK parameters */ 1369 if (stcb->asoc.primary_destination->dest_state & 1370 SCTP_ADDR_UNCONFIRMED) { 1371 /* 1372 * The primary is where we sent the INIT, we can 1373 * always consider it confirmed when the INIT-ACK is 1374 * returned. Do this before we load addresses 1375 * though. 1376 */ 1377 stcb->asoc.primary_destination->dest_state &= 1378 ~SCTP_ADDR_UNCONFIRMED; 1379 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1380 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1381 } 1382 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1383 net, abort_no_unlock, 1384 mflowtype, mflowid, 1385 vrf_id) < 0) { 1386 /* error in parsing parameters */ 1387 return (-1); 1388 } 1389 /* update our state */ 1390 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1391 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1392 1393 /* reset the RTO calc */ 1394 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1395 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1396 stcb->asoc.overall_error_count, 1397 0, 1398 SCTP_FROM_SCTP_INPUT, 1399 __LINE__); 1400 } 1401 stcb->asoc.overall_error_count = 0; 1402 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1403 /* 1404 * collapse the init timer back in case of a exponential 1405 * backoff 1406 */ 1407 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1408 stcb, net); 1409 /* 1410 * the send at the end of the inbound data processing will 1411 * cause the cookie to be sent 1412 */ 1413 break; 1414 case SCTP_STATE_SHUTDOWN_SENT: 1415 /* incorrect state... discard */ 1416 break; 1417 case SCTP_STATE_COOKIE_ECHOED: 1418 /* incorrect state... discard */ 1419 break; 1420 case SCTP_STATE_OPEN: 1421 /* incorrect state... discard */ 1422 break; 1423 case SCTP_STATE_EMPTY: 1424 case SCTP_STATE_INUSE: 1425 default: 1426 /* incorrect state... discard */ 1427 return (-1); 1428 break; 1429 } 1430 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1431 return (0); 1432} 1433 1434static struct sctp_tcb * 1435sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1436 struct sockaddr *src, struct sockaddr *dst, 1437 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1438 struct sctp_inpcb *inp, struct sctp_nets **netp, 1439 struct sockaddr *init_src, int *notification, 1440 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1441 uint8_t mflowtype, uint32_t mflowid, 1442 uint32_t vrf_id, uint16_t port); 1443 1444 1445/* 1446 * handle a state cookie for an existing association m: input packet mbuf 1447 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1448 * "split" mbuf and the cookie signature does not exist offset: offset into 1449 * mbuf to the cookie-echo chunk 1450 */ 1451static struct sctp_tcb * 1452sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1453 struct sockaddr *src, struct sockaddr *dst, 1454 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1455 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1456 struct sockaddr *init_src, int *notification, 1457 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1458 uint8_t mflowtype, uint32_t mflowid, 1459 uint32_t vrf_id, uint16_t port) 1460{ 1461 struct sctp_association *asoc; 1462 struct sctp_init_chunk *init_cp, init_buf; 1463 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1464 struct sctp_nets *net; 1465 struct mbuf *op_err; 1466 int init_offset, initack_offset, i; 1467 int retval; 1468 int spec_flag = 0; 1469 uint32_t how_indx; 1470 1471#if defined(SCTP_DETAILED_STR_STATS) 1472 int j; 1473 1474#endif 1475 1476 net = *netp; 1477 /* I know that the TCB is non-NULL from the caller */ 1478 asoc = &stcb->asoc; 1479 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1480 if (asoc->cookie_how[how_indx] == 0) 1481 break; 1482 } 1483 if (how_indx < sizeof(asoc->cookie_how)) { 1484 asoc->cookie_how[how_indx] = 1; 1485 } 1486 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1487 /* SHUTDOWN came in after sending INIT-ACK */ 1488 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1489 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1490 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1491 mflowtype, mflowid, inp->fibnum, 1492 vrf_id, net->port); 1493 if (how_indx < sizeof(asoc->cookie_how)) 1494 asoc->cookie_how[how_indx] = 2; 1495 return (NULL); 1496 } 1497 /* 1498 * find and validate the INIT chunk in the cookie (peer's info) the 1499 * INIT should start after the cookie-echo header struct (chunk 1500 * header, state cookie header struct) 1501 */ 1502 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1503 1504 init_cp = (struct sctp_init_chunk *) 1505 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1506 (uint8_t *) & init_buf); 1507 if (init_cp == NULL) { 1508 /* could not pull a INIT chunk in cookie */ 1509 return (NULL); 1510 } 1511 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1512 return (NULL); 1513 } 1514 /* 1515 * find and validate the INIT-ACK chunk in the cookie (my info) the 1516 * INIT-ACK follows the INIT chunk 1517 */ 1518 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1519 initack_cp = (struct sctp_init_ack_chunk *) 1520 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1521 (uint8_t *) & initack_buf); 1522 if (initack_cp == NULL) { 1523 /* could not pull INIT-ACK chunk in cookie */ 1524 return (NULL); 1525 } 1526 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1527 return (NULL); 1528 } 1529 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1530 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1531 /* 1532 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1533 * to get into the OPEN state 1534 */ 1535 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1536 /*- 1537 * Opps, this means that we somehow generated two vtag's 1538 * the same. I.e. we did: 1539 * Us Peer 1540 * <---INIT(tag=a)------ 1541 * ----INIT-ACK(tag=t)--> 1542 * ----INIT(tag=t)------> *1 1543 * <---INIT-ACK(tag=a)--- 1544 * <----CE(tag=t)------------- *2 1545 * 1546 * At point *1 we should be generating a different 1547 * tag t'. Which means we would throw away the CE and send 1548 * ours instead. Basically this is case C (throw away side). 1549 */ 1550 if (how_indx < sizeof(asoc->cookie_how)) 1551 asoc->cookie_how[how_indx] = 17; 1552 return (NULL); 1553 1554 } 1555 switch (SCTP_GET_STATE(asoc)) { 1556 case SCTP_STATE_COOKIE_WAIT: 1557 case SCTP_STATE_COOKIE_ECHOED: 1558 /* 1559 * INIT was sent but got a COOKIE_ECHO with the 1560 * correct tags... just accept it...but we must 1561 * process the init so that we can make sure we have 1562 * the right seq no's. 1563 */ 1564 /* First we must process the INIT !! */ 1565 retval = sctp_process_init(init_cp, stcb); 1566 if (retval < 0) { 1567 if (how_indx < sizeof(asoc->cookie_how)) 1568 asoc->cookie_how[how_indx] = 3; 1569 return (NULL); 1570 } 1571 /* we have already processed the INIT so no problem */ 1572 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1573 stcb, net, 1574 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1575 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1576 stcb, net, 1577 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1578 /* update current state */ 1579 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1580 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1581 else 1582 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1583 1584 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1585 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1586 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1587 stcb->sctp_ep, stcb, asoc->primary_destination); 1588 } 1589 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1590 sctp_stop_all_cookie_timers(stcb); 1591 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1592 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1593 (inp->sctp_socket->so_qlimit == 0) 1594 ) { 1595#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1596 struct socket *so; 1597 1598#endif 1599 /* 1600 * Here is where collision would go if we 1601 * did a connect() and instead got a 1602 * init/init-ack/cookie done before the 1603 * init-ack came back.. 1604 */ 1605 stcb->sctp_ep->sctp_flags |= 1606 SCTP_PCB_FLAGS_CONNECTED; 1607#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1608 so = SCTP_INP_SO(stcb->sctp_ep); 1609 atomic_add_int(&stcb->asoc.refcnt, 1); 1610 SCTP_TCB_UNLOCK(stcb); 1611 SCTP_SOCKET_LOCK(so, 1); 1612 SCTP_TCB_LOCK(stcb); 1613 atomic_add_int(&stcb->asoc.refcnt, -1); 1614 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1615 SCTP_SOCKET_UNLOCK(so, 1); 1616 return (NULL); 1617 } 1618#endif 1619 soisconnected(stcb->sctp_socket); 1620#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1621 SCTP_SOCKET_UNLOCK(so, 1); 1622#endif 1623 } 1624 /* notify upper layer */ 1625 *notification = SCTP_NOTIFY_ASSOC_UP; 1626 /* 1627 * since we did not send a HB make sure we don't 1628 * double things 1629 */ 1630 net->hb_responded = 1; 1631 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1632 &cookie->time_entered, 1633 sctp_align_unsafe_makecopy, 1634 SCTP_RTT_FROM_NON_DATA); 1635 1636 if (stcb->asoc.sctp_autoclose_ticks && 1637 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1638 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1639 inp, stcb, NULL); 1640 } 1641 break; 1642 default: 1643 /* 1644 * we're in the OPEN state (or beyond), so peer must 1645 * have simply lost the COOKIE-ACK 1646 */ 1647 break; 1648 } /* end switch */ 1649 sctp_stop_all_cookie_timers(stcb); 1650 /* 1651 * We ignore the return code here.. not sure if we should 1652 * somehow abort.. but we do have an existing asoc. This 1653 * really should not fail. 1654 */ 1655 if (sctp_load_addresses_from_init(stcb, m, 1656 init_offset + sizeof(struct sctp_init_chunk), 1657 initack_offset, src, dst, init_src)) { 1658 if (how_indx < sizeof(asoc->cookie_how)) 1659 asoc->cookie_how[how_indx] = 4; 1660 return (NULL); 1661 } 1662 /* respond with a COOKIE-ACK */ 1663 sctp_toss_old_cookies(stcb, asoc); 1664 sctp_send_cookie_ack(stcb); 1665 if (how_indx < sizeof(asoc->cookie_how)) 1666 asoc->cookie_how[how_indx] = 5; 1667 return (stcb); 1668 } 1669 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1670 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1671 cookie->tie_tag_my_vtag == 0 && 1672 cookie->tie_tag_peer_vtag == 0) { 1673 /* 1674 * case C in Section 5.2.4 Table 2: XMOO silently discard 1675 */ 1676 if (how_indx < sizeof(asoc->cookie_how)) 1677 asoc->cookie_how[how_indx] = 6; 1678 return (NULL); 1679 } 1680 /* 1681 * If nat support, and the below and stcb is established, send back 1682 * a ABORT(colliding state) if we are established. 1683 */ 1684 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1685 (asoc->peer_supports_nat) && 1686 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1687 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1688 (asoc->peer_vtag == 0)))) { 1689 /* 1690 * Special case - Peer's support nat. We may have two init's 1691 * that we gave out the same tag on since one was not 1692 * established.. i.e. we get INIT from host-1 behind the nat 1693 * and we respond tag-a, we get a INIT from host-2 behind 1694 * the nat and we get tag-a again. Then we bring up host-1 1695 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1696 * Now we have colliding state. We must send an abort here 1697 * with colliding state indication. 1698 */ 1699 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1700 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1701 mflowtype, mflowid, inp->fibnum, 1702 vrf_id, port); 1703 return (NULL); 1704 } 1705 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1706 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1707 (asoc->peer_vtag == 0))) { 1708 /* 1709 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1710 * should be ok, re-accept peer info 1711 */ 1712 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1713 /* 1714 * Extension of case C. If we hit this, then the 1715 * random number generator returned the same vtag 1716 * when we first sent our INIT-ACK and when we later 1717 * sent our INIT. The side with the seq numbers that 1718 * are different will be the one that normnally 1719 * would have hit case C. This in effect "extends" 1720 * our vtags in this collision case to be 64 bits. 1721 * The same collision could occur aka you get both 1722 * vtag and seq number the same twice in a row.. but 1723 * is much less likely. If it did happen then we 1724 * would proceed through and bring up the assoc.. we 1725 * may end up with the wrong stream setup however.. 1726 * which would be bad.. but there is no way to 1727 * tell.. until we send on a stream that does not 1728 * exist :-) 1729 */ 1730 if (how_indx < sizeof(asoc->cookie_how)) 1731 asoc->cookie_how[how_indx] = 7; 1732 1733 return (NULL); 1734 } 1735 if (how_indx < sizeof(asoc->cookie_how)) 1736 asoc->cookie_how[how_indx] = 8; 1737 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1738 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1739 sctp_stop_all_cookie_timers(stcb); 1740 /* 1741 * since we did not send a HB make sure we don't double 1742 * things 1743 */ 1744 net->hb_responded = 1; 1745 if (stcb->asoc.sctp_autoclose_ticks && 1746 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1747 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1748 NULL); 1749 } 1750 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1751 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1752 1753 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1754 /* 1755 * Ok the peer probably discarded our data (if we 1756 * echoed a cookie+data). So anything on the 1757 * sent_queue should be marked for retransmit, we 1758 * may not get something to kick us so it COULD 1759 * still take a timeout to move these.. but it can't 1760 * hurt to mark them. 1761 */ 1762 struct sctp_tmit_chunk *chk; 1763 1764 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1765 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1766 chk->sent = SCTP_DATAGRAM_RESEND; 1767 sctp_flight_size_decrease(chk); 1768 sctp_total_flight_decrease(stcb, chk); 1769 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1770 spec_flag++; 1771 } 1772 } 1773 1774 } 1775 /* process the INIT info (peer's info) */ 1776 retval = sctp_process_init(init_cp, stcb); 1777 if (retval < 0) { 1778 if (how_indx < sizeof(asoc->cookie_how)) 1779 asoc->cookie_how[how_indx] = 9; 1780 return (NULL); 1781 } 1782 if (sctp_load_addresses_from_init(stcb, m, 1783 init_offset + sizeof(struct sctp_init_chunk), 1784 initack_offset, src, dst, init_src)) { 1785 if (how_indx < sizeof(asoc->cookie_how)) 1786 asoc->cookie_how[how_indx] = 10; 1787 return (NULL); 1788 } 1789 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1790 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1791 *notification = SCTP_NOTIFY_ASSOC_UP; 1792 1793 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1794 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1795 (inp->sctp_socket->so_qlimit == 0)) { 1796#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1797 struct socket *so; 1798 1799#endif 1800 stcb->sctp_ep->sctp_flags |= 1801 SCTP_PCB_FLAGS_CONNECTED; 1802#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1803 so = SCTP_INP_SO(stcb->sctp_ep); 1804 atomic_add_int(&stcb->asoc.refcnt, 1); 1805 SCTP_TCB_UNLOCK(stcb); 1806 SCTP_SOCKET_LOCK(so, 1); 1807 SCTP_TCB_LOCK(stcb); 1808 atomic_add_int(&stcb->asoc.refcnt, -1); 1809 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1810 SCTP_SOCKET_UNLOCK(so, 1); 1811 return (NULL); 1812 } 1813#endif 1814 soisconnected(stcb->sctp_socket); 1815#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1816 SCTP_SOCKET_UNLOCK(so, 1); 1817#endif 1818 } 1819 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1820 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1821 else 1822 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1823 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1824 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1825 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1826 } else { 1827 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1828 } 1829 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1830 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1831 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1832 stcb->sctp_ep, stcb, asoc->primary_destination); 1833 } 1834 sctp_stop_all_cookie_timers(stcb); 1835 sctp_toss_old_cookies(stcb, asoc); 1836 sctp_send_cookie_ack(stcb); 1837 if (spec_flag) { 1838 /* 1839 * only if we have retrans set do we do this. What 1840 * this call does is get only the COOKIE-ACK out and 1841 * then when we return the normal call to 1842 * sctp_chunk_output will get the retrans out behind 1843 * this. 1844 */ 1845 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1846 } 1847 if (how_indx < sizeof(asoc->cookie_how)) 1848 asoc->cookie_how[how_indx] = 11; 1849 1850 return (stcb); 1851 } 1852 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1853 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1854 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1855 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1856 cookie->tie_tag_peer_vtag != 0) { 1857 struct sctpasochead *head; 1858 1859#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1860 struct socket *so; 1861 1862#endif 1863 1864 if (asoc->peer_supports_nat) { 1865 /* 1866 * This is a gross gross hack. Just call the 1867 * cookie_new code since we are allowing a duplicate 1868 * association. I hope this works... 1869 */ 1870 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1871 sh, cookie, cookie_len, 1872 inp, netp, init_src, notification, 1873 auth_skipped, auth_offset, auth_len, 1874 mflowtype, mflowid, 1875 vrf_id, port)); 1876 } 1877 /* 1878 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1879 */ 1880 /* temp code */ 1881 if (how_indx < sizeof(asoc->cookie_how)) 1882 asoc->cookie_how[how_indx] = 12; 1883 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1884 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1885 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1886 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1887 1888 /* notify upper layer */ 1889 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1890 atomic_add_int(&stcb->asoc.refcnt, 1); 1891 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1892 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1893 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1894 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1895 } 1896 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1897 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1898 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1899 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1900 } 1901 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1902 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1903 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1904 stcb->sctp_ep, stcb, asoc->primary_destination); 1905 1906 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1907 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1908 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1909 } 1910 asoc->pre_open_streams = 1911 ntohs(initack_cp->init.num_outbound_streams); 1912 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1913 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1914 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1915 1916 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1917 1918 asoc->str_reset_seq_in = asoc->init_seq_number; 1919 1920 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1921 if (asoc->mapping_array) { 1922 memset(asoc->mapping_array, 0, 1923 asoc->mapping_array_size); 1924 } 1925 if (asoc->nr_mapping_array) { 1926 memset(asoc->nr_mapping_array, 0, 1927 asoc->mapping_array_size); 1928 } 1929 SCTP_TCB_UNLOCK(stcb); 1930#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1931 so = SCTP_INP_SO(stcb->sctp_ep); 1932 SCTP_SOCKET_LOCK(so, 1); 1933#endif 1934 SCTP_INP_INFO_WLOCK(); 1935 SCTP_INP_WLOCK(stcb->sctp_ep); 1936 SCTP_TCB_LOCK(stcb); 1937 atomic_add_int(&stcb->asoc.refcnt, -1); 1938 /* send up all the data */ 1939 SCTP_TCB_SEND_LOCK(stcb); 1940 1941 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1942 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1943 stcb->asoc.strmout[i].chunks_on_queues = 0; 1944#if defined(SCTP_DETAILED_STR_STATS) 1945 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1946 asoc->strmout[i].abandoned_sent[j] = 0; 1947 asoc->strmout[i].abandoned_unsent[j] = 0; 1948 } 1949#else 1950 asoc->strmout[i].abandoned_sent[0] = 0; 1951 asoc->strmout[i].abandoned_unsent[0] = 0; 1952#endif 1953 stcb->asoc.strmout[i].stream_no = i; 1954 stcb->asoc.strmout[i].next_sequence_send = 0; 1955 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1956 } 1957 /* process the INIT-ACK info (my info) */ 1958 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1959 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1960 1961 /* pull from vtag hash */ 1962 LIST_REMOVE(stcb, sctp_asocs); 1963 /* re-insert to new vtag position */ 1964 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1965 SCTP_BASE_INFO(hashasocmark))]; 1966 /* 1967 * put it in the bucket in the vtag hash of assoc's for the 1968 * system 1969 */ 1970 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1971 1972 SCTP_TCB_SEND_UNLOCK(stcb); 1973 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1974 SCTP_INP_INFO_WUNLOCK(); 1975#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1976 SCTP_SOCKET_UNLOCK(so, 1); 1977#endif 1978 asoc->total_flight = 0; 1979 asoc->total_flight_count = 0; 1980 /* process the INIT info (peer's info) */ 1981 retval = sctp_process_init(init_cp, stcb); 1982 if (retval < 0) { 1983 if (how_indx < sizeof(asoc->cookie_how)) 1984 asoc->cookie_how[how_indx] = 13; 1985 1986 return (NULL); 1987 } 1988 /* 1989 * since we did not send a HB make sure we don't double 1990 * things 1991 */ 1992 net->hb_responded = 1; 1993 1994 if (sctp_load_addresses_from_init(stcb, m, 1995 init_offset + sizeof(struct sctp_init_chunk), 1996 initack_offset, src, dst, init_src)) { 1997 if (how_indx < sizeof(asoc->cookie_how)) 1998 asoc->cookie_how[how_indx] = 14; 1999 2000 return (NULL); 2001 } 2002 /* respond with a COOKIE-ACK */ 2003 sctp_stop_all_cookie_timers(stcb); 2004 sctp_toss_old_cookies(stcb, asoc); 2005 sctp_send_cookie_ack(stcb); 2006 if (how_indx < sizeof(asoc->cookie_how)) 2007 asoc->cookie_how[how_indx] = 15; 2008 2009 return (stcb); 2010 } 2011 if (how_indx < sizeof(asoc->cookie_how)) 2012 asoc->cookie_how[how_indx] = 16; 2013 /* all other cases... */ 2014 return (NULL); 2015} 2016 2017 2018/* 2019 * handle a state cookie for a new association m: input packet mbuf chain-- 2020 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2021 * and the cookie signature does not exist offset: offset into mbuf to the 2022 * cookie-echo chunk length: length of the cookie chunk to: where the init 2023 * was from returns a new TCB 2024 */ 2025static struct sctp_tcb * 2026sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2027 struct sockaddr *src, struct sockaddr *dst, 2028 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2029 struct sctp_inpcb *inp, struct sctp_nets **netp, 2030 struct sockaddr *init_src, int *notification, 2031 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2032 uint8_t mflowtype, uint32_t mflowid, 2033 uint32_t vrf_id, uint16_t port) 2034{ 2035 struct sctp_tcb *stcb; 2036 struct sctp_init_chunk *init_cp, init_buf; 2037 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2038 union sctp_sockstore store; 2039 struct sctp_association *asoc; 2040 int init_offset, initack_offset, initack_limit; 2041 int retval; 2042 int error = 0; 2043 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2044 2045#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2046 struct socket *so; 2047 2048 so = SCTP_INP_SO(inp); 2049#endif 2050 2051 /* 2052 * find and validate the INIT chunk in the cookie (peer's info) the 2053 * INIT should start after the cookie-echo header struct (chunk 2054 * header, state cookie header struct) 2055 */ 2056 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2057 init_cp = (struct sctp_init_chunk *) 2058 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2059 (uint8_t *) & init_buf); 2060 if (init_cp == NULL) { 2061 /* could not pull a INIT chunk in cookie */ 2062 SCTPDBG(SCTP_DEBUG_INPUT1, 2063 "process_cookie_new: could not pull INIT chunk hdr\n"); 2064 return (NULL); 2065 } 2066 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2067 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2068 return (NULL); 2069 } 2070 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2071 /* 2072 * find and validate the INIT-ACK chunk in the cookie (my info) the 2073 * INIT-ACK follows the INIT chunk 2074 */ 2075 initack_cp = (struct sctp_init_ack_chunk *) 2076 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2077 (uint8_t *) & initack_buf); 2078 if (initack_cp == NULL) { 2079 /* could not pull INIT-ACK chunk in cookie */ 2080 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2081 return (NULL); 2082 } 2083 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2084 return (NULL); 2085 } 2086 /* 2087 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2088 * "initack_limit" value. This is because the chk_length field 2089 * includes the length of the cookie, but the cookie is omitted when 2090 * the INIT and INIT_ACK are tacked onto the cookie... 2091 */ 2092 initack_limit = offset + cookie_len; 2093 2094 /* 2095 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2096 * and popluate 2097 */ 2098 2099 /* 2100 * Here we do a trick, we set in NULL for the proc/thread argument. 2101 * We do this since in effect we only use the p argument when the 2102 * socket is unbound and we must do an implicit bind. Since we are 2103 * getting a cookie, we cannot be unbound. 2104 */ 2105 stcb = sctp_aloc_assoc(inp, init_src, &error, 2106 ntohl(initack_cp->init.initiate_tag), vrf_id, 2107 (struct thread *)NULL 2108 ); 2109 if (stcb == NULL) { 2110 struct mbuf *op_err; 2111 2112 /* memory problem? */ 2113 SCTPDBG(SCTP_DEBUG_INPUT1, 2114 "process_cookie_new: no room for another TCB!\n"); 2115 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2116 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2117 src, dst, sh, op_err, 2118 mflowtype, mflowid, 2119 vrf_id, port); 2120 return (NULL); 2121 } 2122 /* get the correct sctp_nets */ 2123 if (netp) 2124 *netp = sctp_findnet(stcb, init_src); 2125 2126 asoc = &stcb->asoc; 2127 /* get scope variables out of cookie */ 2128 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2129 asoc->scope.site_scope = cookie->site_scope; 2130 asoc->scope.local_scope = cookie->local_scope; 2131 asoc->scope.loopback_scope = cookie->loopback_scope; 2132 2133 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2134 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2135 struct mbuf *op_err; 2136 2137 /* 2138 * Houston we have a problem. The EP changed while the 2139 * cookie was in flight. Only recourse is to abort the 2140 * association. 2141 */ 2142 atomic_add_int(&stcb->asoc.refcnt, 1); 2143 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2144 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2145 src, dst, sh, op_err, 2146 mflowtype, mflowid, 2147 vrf_id, port); 2148#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2149 SCTP_TCB_UNLOCK(stcb); 2150 SCTP_SOCKET_LOCK(so, 1); 2151 SCTP_TCB_LOCK(stcb); 2152#endif 2153 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2154 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2155#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2156 SCTP_SOCKET_UNLOCK(so, 1); 2157#endif 2158 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2159 return (NULL); 2160 } 2161 /* process the INIT-ACK info (my info) */ 2162 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2163 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2164 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2165 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2166 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2167 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2168 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2169 asoc->str_reset_seq_in = asoc->init_seq_number; 2170 2171 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2172 2173 /* process the INIT info (peer's info) */ 2174 if (netp) 2175 retval = sctp_process_init(init_cp, stcb); 2176 else 2177 retval = 0; 2178 if (retval < 0) { 2179 atomic_add_int(&stcb->asoc.refcnt, 1); 2180#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2181 SCTP_TCB_UNLOCK(stcb); 2182 SCTP_SOCKET_LOCK(so, 1); 2183 SCTP_TCB_LOCK(stcb); 2184#endif 2185 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2186 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2187#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2188 SCTP_SOCKET_UNLOCK(so, 1); 2189#endif 2190 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2191 return (NULL); 2192 } 2193 /* load all addresses */ 2194 if (sctp_load_addresses_from_init(stcb, m, 2195 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2196 src, dst, init_src)) { 2197 atomic_add_int(&stcb->asoc.refcnt, 1); 2198#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2199 SCTP_TCB_UNLOCK(stcb); 2200 SCTP_SOCKET_LOCK(so, 1); 2201 SCTP_TCB_LOCK(stcb); 2202#endif 2203 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2204 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2205#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2206 SCTP_SOCKET_UNLOCK(so, 1); 2207#endif 2208 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2209 return (NULL); 2210 } 2211 /* 2212 * verify any preceding AUTH chunk that was skipped 2213 */ 2214 /* pull the local authentication parameters from the cookie/init-ack */ 2215 sctp_auth_get_cookie_params(stcb, m, 2216 initack_offset + sizeof(struct sctp_init_ack_chunk), 2217 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2218 if (auth_skipped) { 2219 struct sctp_auth_chunk *auth; 2220 2221 auth = (struct sctp_auth_chunk *) 2222 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2223 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2224 /* auth HMAC failed, dump the assoc and packet */ 2225 SCTPDBG(SCTP_DEBUG_AUTH1, 2226 "COOKIE-ECHO: AUTH failed\n"); 2227 atomic_add_int(&stcb->asoc.refcnt, 1); 2228#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2229 SCTP_TCB_UNLOCK(stcb); 2230 SCTP_SOCKET_LOCK(so, 1); 2231 SCTP_TCB_LOCK(stcb); 2232#endif 2233 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2234 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2235#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2236 SCTP_SOCKET_UNLOCK(so, 1); 2237#endif 2238 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2239 return (NULL); 2240 } else { 2241 /* remaining chunks checked... good to go */ 2242 stcb->asoc.authenticated = 1; 2243 } 2244 } 2245 /* update current state */ 2246 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2247 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2248 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2249 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2250 stcb->sctp_ep, stcb, asoc->primary_destination); 2251 } 2252 sctp_stop_all_cookie_timers(stcb); 2253 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2254 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2255 2256 /* 2257 * if we're doing ASCONFs, check to see if we have any new local 2258 * addresses that need to get added to the peer (eg. addresses 2259 * changed while cookie echo in flight). This needs to be done 2260 * after we go to the OPEN state to do the correct asconf 2261 * processing. else, make sure we have the correct addresses in our 2262 * lists 2263 */ 2264 2265 /* warning, we re-use sin, sin6, sa_store here! */ 2266 /* pull in local_address (our "from" address) */ 2267 switch (cookie->laddr_type) { 2268#ifdef INET 2269 case SCTP_IPV4_ADDRESS: 2270 /* source addr is IPv4 */ 2271 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2272 store.sin.sin_family = AF_INET; 2273 store.sin.sin_len = sizeof(struct sockaddr_in); 2274 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2275 break; 2276#endif 2277#ifdef INET6 2278 case SCTP_IPV6_ADDRESS: 2279 /* source addr is IPv6 */ 2280 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2281 store.sin6.sin6_family = AF_INET6; 2282 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2283 store.sin6.sin6_scope_id = cookie->scope_id; 2284 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2285 break; 2286#endif 2287 default: 2288 atomic_add_int(&stcb->asoc.refcnt, 1); 2289#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2290 SCTP_TCB_UNLOCK(stcb); 2291 SCTP_SOCKET_LOCK(so, 1); 2292 SCTP_TCB_LOCK(stcb); 2293#endif 2294 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2295 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2296#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2297 SCTP_SOCKET_UNLOCK(so, 1); 2298#endif 2299 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2300 return (NULL); 2301 } 2302 2303 /* set up to notify upper layer */ 2304 *notification = SCTP_NOTIFY_ASSOC_UP; 2305 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2306 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2307 (inp->sctp_socket->so_qlimit == 0)) { 2308 /* 2309 * This is an endpoint that called connect() how it got a 2310 * cookie that is NEW is a bit of a mystery. It must be that 2311 * the INIT was sent, but before it got there.. a complete 2312 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2313 * should have went to the other code.. not here.. oh well.. 2314 * a bit of protection is worth having.. 2315 */ 2316 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2317#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2318 atomic_add_int(&stcb->asoc.refcnt, 1); 2319 SCTP_TCB_UNLOCK(stcb); 2320 SCTP_SOCKET_LOCK(so, 1); 2321 SCTP_TCB_LOCK(stcb); 2322 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2323 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2324 SCTP_SOCKET_UNLOCK(so, 1); 2325 return (NULL); 2326 } 2327#endif 2328 soisconnected(stcb->sctp_socket); 2329#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2330 SCTP_SOCKET_UNLOCK(so, 1); 2331#endif 2332 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2333 (inp->sctp_socket->so_qlimit)) { 2334 /* 2335 * We don't want to do anything with this one. Since it is 2336 * the listening guy. The timer will get started for 2337 * accepted connections in the caller. 2338 */ 2339 ; 2340 } 2341 /* since we did not send a HB make sure we don't double things */ 2342 if ((netp) && (*netp)) 2343 (*netp)->hb_responded = 1; 2344 2345 if (stcb->asoc.sctp_autoclose_ticks && 2346 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2347 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2348 } 2349 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2350 if ((netp) && (*netp)) { 2351 /* calculate the RTT and set the encaps port */ 2352 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2353 &cookie->time_entered, sctp_align_unsafe_makecopy, 2354 SCTP_RTT_FROM_NON_DATA); 2355 (*netp)->port = port; 2356 } 2357 /* respond with a COOKIE-ACK */ 2358 sctp_send_cookie_ack(stcb); 2359 2360 /* 2361 * check the address lists for any ASCONFs that need to be sent 2362 * AFTER the cookie-ack is sent 2363 */ 2364 sctp_check_address_list(stcb, m, 2365 initack_offset + sizeof(struct sctp_init_ack_chunk), 2366 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2367 &store.sa, cookie->local_scope, cookie->site_scope, 2368 cookie->ipv4_scope, cookie->loopback_scope); 2369 2370 2371 return (stcb); 2372} 2373 2374/* 2375 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2376 * we NEED to make sure we are not already using the vtag. If so we 2377 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2378 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2379 SCTP_BASE_INFO(hashasocmark))]; 2380 LIST_FOREACH(stcb, head, sctp_asocs) { 2381 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2382 -- SEND ABORT - TRY AGAIN -- 2383 } 2384 } 2385*/ 2386 2387/* 2388 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2389 * existing (non-NULL) TCB 2390 */ 2391static struct mbuf * 2392sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2393 struct sockaddr *src, struct sockaddr *dst, 2394 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2395 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2396 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2397 struct sctp_tcb **locked_tcb, 2398 uint8_t mflowtype, uint32_t mflowid, 2399 uint32_t vrf_id, uint16_t port) 2400{ 2401 struct sctp_state_cookie *cookie; 2402 struct sctp_tcb *l_stcb = *stcb; 2403 struct sctp_inpcb *l_inp; 2404 struct sockaddr *to; 2405 struct sctp_pcb *ep; 2406 struct mbuf *m_sig; 2407 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2408 uint8_t *sig; 2409 uint8_t cookie_ok = 0; 2410 unsigned int sig_offset, cookie_offset; 2411 unsigned int cookie_len; 2412 struct timeval now; 2413 struct timeval time_expires; 2414 int notification = 0; 2415 struct sctp_nets *netl; 2416 int had_a_existing_tcb = 0; 2417 int send_int_conf = 0; 2418 2419#ifdef INET 2420 struct sockaddr_in sin; 2421 2422#endif 2423#ifdef INET6 2424 struct sockaddr_in6 sin6; 2425 2426#endif 2427 2428 SCTPDBG(SCTP_DEBUG_INPUT2, 2429 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2430 2431 if (inp_p == NULL) { 2432 return (NULL); 2433 } 2434 cookie = &cp->cookie; 2435 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2436 cookie_len = ntohs(cp->ch.chunk_length); 2437 2438 if ((cookie->peerport != sh->src_port) && 2439 (cookie->myport != sh->dest_port) && 2440 (cookie->my_vtag != sh->v_tag)) { 2441 /* 2442 * invalid ports or bad tag. Note that we always leave the 2443 * v_tag in the header in network order and when we stored 2444 * it in the my_vtag slot we also left it in network order. 2445 * This maintains the match even though it may be in the 2446 * opposite byte order of the machine :-> 2447 */ 2448 return (NULL); 2449 } 2450 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2451 sizeof(struct sctp_init_chunk) + 2452 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2453 /* cookie too small */ 2454 return (NULL); 2455 } 2456 /* 2457 * split off the signature into its own mbuf (since it should not be 2458 * calculated in the sctp_hmac_m() call). 2459 */ 2460 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2461 m_sig = m_split(m, sig_offset, M_NOWAIT); 2462 if (m_sig == NULL) { 2463 /* out of memory or ?? */ 2464 return (NULL); 2465 } 2466#ifdef SCTP_MBUF_LOGGING 2467 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2468 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2469 } 2470#endif 2471 2472 /* 2473 * compute the signature/digest for the cookie 2474 */ 2475 ep = &(*inp_p)->sctp_ep; 2476 l_inp = *inp_p; 2477 if (l_stcb) { 2478 SCTP_TCB_UNLOCK(l_stcb); 2479 } 2480 SCTP_INP_RLOCK(l_inp); 2481 if (l_stcb) { 2482 SCTP_TCB_LOCK(l_stcb); 2483 } 2484 /* which cookie is it? */ 2485 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2486 (ep->current_secret_number != ep->last_secret_number)) { 2487 /* it's the old cookie */ 2488 (void)sctp_hmac_m(SCTP_HMAC, 2489 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2490 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2491 } else { 2492 /* it's the current cookie */ 2493 (void)sctp_hmac_m(SCTP_HMAC, 2494 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2495 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2496 } 2497 /* get the signature */ 2498 SCTP_INP_RUNLOCK(l_inp); 2499 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2500 if (sig == NULL) { 2501 /* couldn't find signature */ 2502 sctp_m_freem(m_sig); 2503 return (NULL); 2504 } 2505 /* compare the received digest with the computed digest */ 2506 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2507 /* try the old cookie? */ 2508 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2509 (ep->current_secret_number != ep->last_secret_number)) { 2510 /* compute digest with old */ 2511 (void)sctp_hmac_m(SCTP_HMAC, 2512 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2513 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2514 /* compare */ 2515 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2516 cookie_ok = 1; 2517 } 2518 } else { 2519 cookie_ok = 1; 2520 } 2521 2522 /* 2523 * Now before we continue we must reconstruct our mbuf so that 2524 * normal processing of any other chunks will work. 2525 */ 2526 { 2527 struct mbuf *m_at; 2528 2529 m_at = m; 2530 while (SCTP_BUF_NEXT(m_at) != NULL) { 2531 m_at = SCTP_BUF_NEXT(m_at); 2532 } 2533 SCTP_BUF_NEXT(m_at) = m_sig; 2534 } 2535 2536 if (cookie_ok == 0) { 2537 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2538 SCTPDBG(SCTP_DEBUG_INPUT2, 2539 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2540 (uint32_t) offset, cookie_offset, sig_offset); 2541 return (NULL); 2542 } 2543 /* 2544 * check the cookie timestamps to be sure it's not stale 2545 */ 2546 (void)SCTP_GETTIME_TIMEVAL(&now); 2547 /* Expire time is in Ticks, so we convert to seconds */ 2548 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2549 time_expires.tv_usec = cookie->time_entered.tv_usec; 2550 /* 2551 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2552 * is undefined. 2553 */ 2554 if (timevalcmp(&now, &time_expires, >)) { 2555 /* cookie is stale! */ 2556 struct mbuf *op_err; 2557 struct sctp_error_stale_cookie *cause; 2558 uint32_t tim; 2559 2560 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2561 0, M_NOWAIT, 1, MT_DATA); 2562 if (op_err == NULL) { 2563 /* FOOBAR */ 2564 return (NULL); 2565 } 2566 /* Set the len */ 2567 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2568 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2569 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2570 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2571 (sizeof(uint32_t)))); 2572 /* seconds to usec */ 2573 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2574 /* add in usec */ 2575 if (tim == 0) 2576 tim = now.tv_usec - cookie->time_entered.tv_usec; 2577 cause->stale_time = htonl(tim); 2578 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2579 mflowtype, mflowid, l_inp->fibnum, 2580 vrf_id, port); 2581 return (NULL); 2582 } 2583 /* 2584 * Now we must see with the lookup address if we have an existing 2585 * asoc. This will only happen if we were in the COOKIE-WAIT state 2586 * and a INIT collided with us and somewhere the peer sent the 2587 * cookie on another address besides the single address our assoc 2588 * had for him. In this case we will have one of the tie-tags set at 2589 * least AND the address field in the cookie can be used to look it 2590 * up. 2591 */ 2592 to = NULL; 2593 switch (cookie->addr_type) { 2594#ifdef INET6 2595 case SCTP_IPV6_ADDRESS: 2596 memset(&sin6, 0, sizeof(sin6)); 2597 sin6.sin6_family = AF_INET6; 2598 sin6.sin6_len = sizeof(sin6); 2599 sin6.sin6_port = sh->src_port; 2600 sin6.sin6_scope_id = cookie->scope_id; 2601 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2602 sizeof(sin6.sin6_addr.s6_addr)); 2603 to = (struct sockaddr *)&sin6; 2604 break; 2605#endif 2606#ifdef INET 2607 case SCTP_IPV4_ADDRESS: 2608 memset(&sin, 0, sizeof(sin)); 2609 sin.sin_family = AF_INET; 2610 sin.sin_len = sizeof(sin); 2611 sin.sin_port = sh->src_port; 2612 sin.sin_addr.s_addr = cookie->address[0]; 2613 to = (struct sockaddr *)&sin; 2614 break; 2615#endif 2616 default: 2617 /* This should not happen */ 2618 return (NULL); 2619 } 2620 if (*stcb == NULL) { 2621 /* Yep, lets check */ 2622 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2623 if (*stcb == NULL) { 2624 /* 2625 * We should have only got back the same inp. If we 2626 * got back a different ep we have a problem. The 2627 * original findep got back l_inp and now 2628 */ 2629 if (l_inp != *inp_p) { 2630 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2631 } 2632 } else { 2633 if (*locked_tcb == NULL) { 2634 /* 2635 * In this case we found the assoc only 2636 * after we locked the create lock. This 2637 * means we are in a colliding case and we 2638 * must make sure that we unlock the tcb if 2639 * its one of the cases where we throw away 2640 * the incoming packets. 2641 */ 2642 *locked_tcb = *stcb; 2643 2644 /* 2645 * We must also increment the inp ref count 2646 * since the ref_count flags was set when we 2647 * did not find the TCB, now we found it 2648 * which reduces the refcount.. we must 2649 * raise it back out to balance it all :-) 2650 */ 2651 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2652 if ((*stcb)->sctp_ep != l_inp) { 2653 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2654 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2655 } 2656 } 2657 } 2658 } 2659 cookie_len -= SCTP_SIGNATURE_SIZE; 2660 if (*stcb == NULL) { 2661 /* this is the "normal" case... get a new TCB */ 2662 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2663 cookie, cookie_len, *inp_p, 2664 netp, to, ¬ification, 2665 auth_skipped, auth_offset, auth_len, 2666 mflowtype, mflowid, 2667 vrf_id, port); 2668 } else { 2669 /* this is abnormal... cookie-echo on existing TCB */ 2670 had_a_existing_tcb = 1; 2671 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2672 src, dst, sh, 2673 cookie, cookie_len, *inp_p, *stcb, netp, to, 2674 ¬ification, auth_skipped, auth_offset, auth_len, 2675 mflowtype, mflowid, 2676 vrf_id, port); 2677 } 2678 2679 if (*stcb == NULL) { 2680 /* still no TCB... must be bad cookie-echo */ 2681 return (NULL); 2682 } 2683 if (*netp != NULL) { 2684 (*netp)->flowtype = mflowtype; 2685 (*netp)->flowid = mflowid; 2686 } 2687 /* 2688 * Ok, we built an association so confirm the address we sent the 2689 * INIT-ACK to. 2690 */ 2691 netl = sctp_findnet(*stcb, to); 2692 /* 2693 * This code should in theory NOT run but 2694 */ 2695 if (netl == NULL) { 2696 /* TSNH! Huh, why do I need to add this address here? */ 2697 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2698 return (NULL); 2699 } 2700 netl = sctp_findnet(*stcb, to); 2701 } 2702 if (netl) { 2703 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2704 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2705 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2706 netl); 2707 send_int_conf = 1; 2708 } 2709 } 2710 sctp_start_net_timers(*stcb); 2711 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2712 if (!had_a_existing_tcb || 2713 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2714 /* 2715 * If we have a NEW cookie or the connect never 2716 * reached the connected state during collision we 2717 * must do the TCP accept thing. 2718 */ 2719 struct socket *so, *oso; 2720 struct sctp_inpcb *inp; 2721 2722 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2723 /* 2724 * For a restart we will keep the same 2725 * socket, no need to do anything. I THINK!! 2726 */ 2727 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2728 if (send_int_conf) { 2729 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2730 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2731 } 2732 return (m); 2733 } 2734 oso = (*inp_p)->sctp_socket; 2735 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2736 SCTP_TCB_UNLOCK((*stcb)); 2737 CURVNET_SET(oso->so_vnet); 2738 so = sonewconn(oso, 0 2739 ); 2740 CURVNET_RESTORE(); 2741 SCTP_TCB_LOCK((*stcb)); 2742 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2743 2744 if (so == NULL) { 2745 struct mbuf *op_err; 2746 2747#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2748 struct socket *pcb_so; 2749 2750#endif 2751 /* Too many sockets */ 2752 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2753 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2754 sctp_abort_association(*inp_p, NULL, m, iphlen, 2755 src, dst, sh, op_err, 2756 mflowtype, mflowid, 2757 vrf_id, port); 2758#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2759 pcb_so = SCTP_INP_SO(*inp_p); 2760 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2761 SCTP_TCB_UNLOCK((*stcb)); 2762 SCTP_SOCKET_LOCK(pcb_so, 1); 2763 SCTP_TCB_LOCK((*stcb)); 2764 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2765#endif 2766 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2767 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2768#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2769 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2770#endif 2771 return (NULL); 2772 } 2773 inp = (struct sctp_inpcb *)so->so_pcb; 2774 SCTP_INP_INCR_REF(inp); 2775 /* 2776 * We add the unbound flag here so that if we get an 2777 * soabort() before we get the move_pcb done, we 2778 * will properly cleanup. 2779 */ 2780 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2781 SCTP_PCB_FLAGS_CONNECTED | 2782 SCTP_PCB_FLAGS_IN_TCPPOOL | 2783 SCTP_PCB_FLAGS_UNBOUND | 2784 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2785 SCTP_PCB_FLAGS_DONT_WAKE); 2786 inp->sctp_features = (*inp_p)->sctp_features; 2787 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2788 inp->sctp_socket = so; 2789 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2790 inp->max_cwnd = (*inp_p)->max_cwnd; 2791 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2792 inp->ecn_supported = (*inp_p)->ecn_supported; 2793 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2794 inp->auth_supported = (*inp_p)->auth_supported; 2795 inp->asconf_supported = (*inp_p)->asconf_supported; 2796 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2797 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2798 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2799 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2800 inp->sctp_context = (*inp_p)->sctp_context; 2801 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2802 inp->fibnum = (*inp_p)->fibnum; 2803 inp->inp_starting_point_for_iterator = NULL; 2804 /* 2805 * copy in the authentication parameters from the 2806 * original endpoint 2807 */ 2808 if (inp->sctp_ep.local_hmacs) 2809 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2810 inp->sctp_ep.local_hmacs = 2811 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2812 if (inp->sctp_ep.local_auth_chunks) 2813 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2814 inp->sctp_ep.local_auth_chunks = 2815 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2816 2817 /* 2818 * Now we must move it from one hash table to 2819 * another and get the tcb in the right place. 2820 */ 2821 2822 /* 2823 * This is where the one-2-one socket is put into 2824 * the accept state waiting for the accept! 2825 */ 2826 if (*stcb) { 2827 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2828 } 2829 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2830 2831 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2832 SCTP_TCB_UNLOCK((*stcb)); 2833 2834 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2835 0); 2836 SCTP_TCB_LOCK((*stcb)); 2837 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2838 2839 2840 /* 2841 * now we must check to see if we were aborted while 2842 * the move was going on and the lock/unlock 2843 * happened. 2844 */ 2845 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2846 /* 2847 * yep it was, we leave the assoc attached 2848 * to the socket since the sctp_inpcb_free() 2849 * call will send an abort for us. 2850 */ 2851 SCTP_INP_DECR_REF(inp); 2852 return (NULL); 2853 } 2854 SCTP_INP_DECR_REF(inp); 2855 /* Switch over to the new guy */ 2856 *inp_p = inp; 2857 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2858 if (send_int_conf) { 2859 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2860 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2861 } 2862 /* 2863 * Pull it from the incomplete queue and wake the 2864 * guy 2865 */ 2866#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2867 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2868 SCTP_TCB_UNLOCK((*stcb)); 2869 SCTP_SOCKET_LOCK(so, 1); 2870#endif 2871 soisconnected(so); 2872#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2873 SCTP_TCB_LOCK((*stcb)); 2874 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2875 SCTP_SOCKET_UNLOCK(so, 1); 2876#endif 2877 return (m); 2878 } 2879 } 2880 if (notification) { 2881 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2882 } 2883 if (send_int_conf) { 2884 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2885 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2886 } 2887 return (m); 2888} 2889 2890static void 2891sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2892 struct sctp_tcb *stcb, struct sctp_nets *net) 2893{ 2894 /* cp must not be used, others call this without a c-ack :-) */ 2895 struct sctp_association *asoc; 2896 2897 SCTPDBG(SCTP_DEBUG_INPUT2, 2898 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2899 if ((stcb == NULL) || (net == NULL)) { 2900 return; 2901 } 2902 asoc = &stcb->asoc; 2903 2904 sctp_stop_all_cookie_timers(stcb); 2905 /* process according to association state */ 2906 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2907 /* state change only needed when I am in right state */ 2908 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2909 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2910 sctp_start_net_timers(stcb); 2911 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2912 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2913 stcb->sctp_ep, stcb, asoc->primary_destination); 2914 2915 } 2916 /* update RTO */ 2917 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2918 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2919 if (asoc->overall_error_count == 0) { 2920 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2921 &asoc->time_entered, sctp_align_safe_nocopy, 2922 SCTP_RTT_FROM_NON_DATA); 2923 } 2924 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2925 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2926 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2927 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2928#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2929 struct socket *so; 2930 2931#endif 2932 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2933#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2934 so = SCTP_INP_SO(stcb->sctp_ep); 2935 atomic_add_int(&stcb->asoc.refcnt, 1); 2936 SCTP_TCB_UNLOCK(stcb); 2937 SCTP_SOCKET_LOCK(so, 1); 2938 SCTP_TCB_LOCK(stcb); 2939 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2940#endif 2941 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2942 soisconnected(stcb->sctp_socket); 2943 } 2944#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2945 SCTP_SOCKET_UNLOCK(so, 1); 2946#endif 2947 } 2948 /* 2949 * since we did not send a HB make sure we don't double 2950 * things 2951 */ 2952 net->hb_responded = 1; 2953 2954 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2955 /* 2956 * We don't need to do the asconf thing, nor hb or 2957 * autoclose if the socket is closed. 2958 */ 2959 goto closed_socket; 2960 } 2961 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2962 stcb, net); 2963 2964 2965 if (stcb->asoc.sctp_autoclose_ticks && 2966 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2967 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2968 stcb->sctp_ep, stcb, NULL); 2969 } 2970 /* 2971 * send ASCONF if parameters are pending and ASCONFs are 2972 * allowed (eg. addresses changed when init/cookie echo were 2973 * in flight) 2974 */ 2975 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2976 (stcb->asoc.asconf_supported == 1) && 2977 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2978#ifdef SCTP_TIMER_BASED_ASCONF 2979 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2980 stcb->sctp_ep, stcb, 2981 stcb->asoc.primary_destination); 2982#else 2983 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2984 SCTP_ADDR_NOT_LOCKED); 2985#endif 2986 } 2987 } 2988closed_socket: 2989 /* Toss the cookie if I can */ 2990 sctp_toss_old_cookies(stcb, asoc); 2991 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2992 /* Restart the timer if we have pending data */ 2993 struct sctp_tmit_chunk *chk; 2994 2995 chk = TAILQ_FIRST(&asoc->sent_queue); 2996 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2997 } 2998} 2999 3000static void 3001sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3002 struct sctp_tcb *stcb) 3003{ 3004 struct sctp_nets *net; 3005 struct sctp_tmit_chunk *lchk; 3006 struct sctp_ecne_chunk bkup; 3007 uint8_t override_bit; 3008 uint32_t tsn, window_data_tsn; 3009 int len; 3010 unsigned int pkt_cnt; 3011 3012 len = ntohs(cp->ch.chunk_length); 3013 if ((len != sizeof(struct sctp_ecne_chunk)) && 3014 (len != sizeof(struct old_sctp_ecne_chunk))) { 3015 return; 3016 } 3017 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3018 /* Its the old format */ 3019 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3020 bkup.num_pkts_since_cwr = htonl(1); 3021 cp = &bkup; 3022 } 3023 SCTP_STAT_INCR(sctps_recvecne); 3024 tsn = ntohl(cp->tsn); 3025 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3026 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3027 if (lchk == NULL) { 3028 window_data_tsn = stcb->asoc.sending_seq - 1; 3029 } else { 3030 window_data_tsn = lchk->rec.data.TSN_seq; 3031 } 3032 3033 /* Find where it was sent to if possible. */ 3034 net = NULL; 3035 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3036 if (lchk->rec.data.TSN_seq == tsn) { 3037 net = lchk->whoTo; 3038 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3039 break; 3040 } 3041 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3042 break; 3043 } 3044 } 3045 if (net == NULL) { 3046 /* 3047 * What to do. A previous send of a CWR was possibly lost. 3048 * See how old it is, we may have it marked on the actual 3049 * net. 3050 */ 3051 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3052 if (tsn == net->last_cwr_tsn) { 3053 /* Found him, send it off */ 3054 break; 3055 } 3056 } 3057 if (net == NULL) { 3058 /* 3059 * If we reach here, we need to send a special CWR 3060 * that says hey, we did this a long time ago and 3061 * you lost the response. 3062 */ 3063 net = TAILQ_FIRST(&stcb->asoc.nets); 3064 if (net == NULL) { 3065 /* TSNH */ 3066 return; 3067 } 3068 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3069 } else { 3070 override_bit = 0; 3071 } 3072 } else { 3073 override_bit = 0; 3074 } 3075 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3076 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3077 /* 3078 * JRS - Use the congestion control given in the pluggable 3079 * CC module 3080 */ 3081 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3082 /* 3083 * We reduce once every RTT. So we will only lower cwnd at 3084 * the next sending seq i.e. the window_data_tsn 3085 */ 3086 net->cwr_window_tsn = window_data_tsn; 3087 net->ecn_ce_pkt_cnt += pkt_cnt; 3088 net->lost_cnt = pkt_cnt; 3089 net->last_cwr_tsn = tsn; 3090 } else { 3091 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3092 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3093 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3094 /* 3095 * Another loss in the same window update how many 3096 * marks/packets lost we have had. 3097 */ 3098 int cnt = 1; 3099 3100 if (pkt_cnt > net->lost_cnt) { 3101 /* Should be the case */ 3102 cnt = (pkt_cnt - net->lost_cnt); 3103 net->ecn_ce_pkt_cnt += cnt; 3104 } 3105 net->lost_cnt = pkt_cnt; 3106 net->last_cwr_tsn = tsn; 3107 /* 3108 * Most CC functions will ignore this call, since we 3109 * are in-window yet of the initial CE the peer saw. 3110 */ 3111 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3112 } 3113 } 3114 /* 3115 * We always send a CWR this way if our previous one was lost our 3116 * peer will get an update, or if it is not time again to reduce we 3117 * still get the cwr to the peer. Note we set the override when we 3118 * could not find the TSN on the chunk or the destination network. 3119 */ 3120 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3121} 3122 3123static void 3124sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3125{ 3126 /* 3127 * Here we get a CWR from the peer. We must look in the outqueue and 3128 * make sure that we have a covered ECNE in the control chunk part. 3129 * If so remove it. 3130 */ 3131 struct sctp_tmit_chunk *chk; 3132 struct sctp_ecne_chunk *ecne; 3133 int override; 3134 uint32_t cwr_tsn; 3135 3136 cwr_tsn = ntohl(cp->tsn); 3137 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3138 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3139 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3140 continue; 3141 } 3142 if ((override == 0) && (chk->whoTo != net)) { 3143 /* Must be from the right src unless override is set */ 3144 continue; 3145 } 3146 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3147 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3148 /* this covers this ECNE, we can remove it */ 3149 stcb->asoc.ecn_echo_cnt_onq--; 3150 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3151 sctp_next); 3152 sctp_m_freem(chk->data); 3153 chk->data = NULL; 3154 stcb->asoc.ctrl_queue_cnt--; 3155 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3156 if (override == 0) { 3157 break; 3158 } 3159 } 3160 } 3161} 3162 3163static void 3164sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3165 struct sctp_tcb *stcb, struct sctp_nets *net) 3166{ 3167 struct sctp_association *asoc; 3168 3169#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3170 struct socket *so; 3171 3172#endif 3173 3174 SCTPDBG(SCTP_DEBUG_INPUT2, 3175 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3176 if (stcb == NULL) 3177 return; 3178 3179 asoc = &stcb->asoc; 3180 /* process according to association state */ 3181 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3182 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3183 SCTPDBG(SCTP_DEBUG_INPUT2, 3184 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3185 SCTP_TCB_UNLOCK(stcb); 3186 return; 3187 } 3188 /* notify upper layer protocol */ 3189 if (stcb->sctp_socket) { 3190 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3191 } 3192#ifdef INVARIANTS 3193 if (!TAILQ_EMPTY(&asoc->send_queue) || 3194 !TAILQ_EMPTY(&asoc->sent_queue) || 3195 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3196 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3197 } 3198#endif 3199 /* stop the timer */ 3200 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3201 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3202 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3203 /* free the TCB */ 3204 SCTPDBG(SCTP_DEBUG_INPUT2, 3205 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3206#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3207 so = SCTP_INP_SO(stcb->sctp_ep); 3208 atomic_add_int(&stcb->asoc.refcnt, 1); 3209 SCTP_TCB_UNLOCK(stcb); 3210 SCTP_SOCKET_LOCK(so, 1); 3211 SCTP_TCB_LOCK(stcb); 3212 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3213#endif 3214 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3215 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3216#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3217 SCTP_SOCKET_UNLOCK(so, 1); 3218#endif 3219 return; 3220} 3221 3222static int 3223process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3224 struct sctp_nets *net, uint8_t flg) 3225{ 3226 switch (desc->chunk_type) { 3227 case SCTP_DATA: 3228 /* find the tsn to resend (possibly */ 3229 { 3230 uint32_t tsn; 3231 struct sctp_tmit_chunk *tp1; 3232 3233 tsn = ntohl(desc->tsn_ifany); 3234 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3235 if (tp1->rec.data.TSN_seq == tsn) { 3236 /* found it */ 3237 break; 3238 } 3239 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3240 /* not found */ 3241 tp1 = NULL; 3242 break; 3243 } 3244 } 3245 if (tp1 == NULL) { 3246 /* 3247 * Do it the other way , aka without paying 3248 * attention to queue seq order. 3249 */ 3250 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3251 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3252 if (tp1->rec.data.TSN_seq == tsn) { 3253 /* found it */ 3254 break; 3255 } 3256 } 3257 } 3258 if (tp1 == NULL) { 3259 SCTP_STAT_INCR(sctps_pdrptsnnf); 3260 } 3261 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3262 uint8_t *ddp; 3263 3264 if (((flg & SCTP_BADCRC) == 0) && 3265 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3266 return (0); 3267 } 3268 if ((stcb->asoc.peers_rwnd == 0) && 3269 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3270 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3271 return (0); 3272 } 3273 if (stcb->asoc.peers_rwnd == 0 && 3274 (flg & SCTP_FROM_MIDDLE_BOX)) { 3275 SCTP_STAT_INCR(sctps_pdrpdizrw); 3276 return (0); 3277 } 3278 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3279 sizeof(struct sctp_data_chunk)); 3280 { 3281 unsigned int iii; 3282 3283 for (iii = 0; iii < sizeof(desc->data_bytes); 3284 iii++) { 3285 if (ddp[iii] != desc->data_bytes[iii]) { 3286 SCTP_STAT_INCR(sctps_pdrpbadd); 3287 return (-1); 3288 } 3289 } 3290 } 3291 3292 if (tp1->do_rtt) { 3293 /* 3294 * this guy had a RTO calculation 3295 * pending on it, cancel it 3296 */ 3297 if (tp1->whoTo->rto_needed == 0) { 3298 tp1->whoTo->rto_needed = 1; 3299 } 3300 tp1->do_rtt = 0; 3301 } 3302 SCTP_STAT_INCR(sctps_pdrpmark); 3303 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3304 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3305 /* 3306 * mark it as if we were doing a FR, since 3307 * we will be getting gap ack reports behind 3308 * the info from the router. 3309 */ 3310 tp1->rec.data.doing_fast_retransmit = 1; 3311 /* 3312 * mark the tsn with what sequences can 3313 * cause a new FR. 3314 */ 3315 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3316 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3317 } else { 3318 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3319 } 3320 3321 /* restart the timer */ 3322 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3323 stcb, tp1->whoTo, 3324 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3325 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3326 stcb, tp1->whoTo); 3327 3328 /* fix counts and things */ 3329 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3330 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3331 tp1->whoTo->flight_size, 3332 tp1->book_size, 3333 (uintptr_t) stcb, 3334 tp1->rec.data.TSN_seq); 3335 } 3336 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3337 sctp_flight_size_decrease(tp1); 3338 sctp_total_flight_decrease(stcb, tp1); 3339 } 3340 tp1->sent = SCTP_DATAGRAM_RESEND; 3341 } { 3342 /* audit code */ 3343 unsigned int audit; 3344 3345 audit = 0; 3346 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3347 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3348 audit++; 3349 } 3350 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3351 sctp_next) { 3352 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3353 audit++; 3354 } 3355 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3356 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3357 audit, stcb->asoc.sent_queue_retran_cnt); 3358#ifndef SCTP_AUDITING_ENABLED 3359 stcb->asoc.sent_queue_retran_cnt = audit; 3360#endif 3361 } 3362 } 3363 } 3364 break; 3365 case SCTP_ASCONF: 3366 { 3367 struct sctp_tmit_chunk *asconf; 3368 3369 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3370 sctp_next) { 3371 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3372 break; 3373 } 3374 } 3375 if (asconf) { 3376 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3377 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3378 asconf->sent = SCTP_DATAGRAM_RESEND; 3379 asconf->snd_count--; 3380 } 3381 } 3382 break; 3383 case SCTP_INITIATION: 3384 /* resend the INIT */ 3385 stcb->asoc.dropped_special_cnt++; 3386 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3387 /* 3388 * If we can get it in, in a few attempts we do 3389 * this, otherwise we let the timer fire. 3390 */ 3391 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3392 stcb, net, 3393 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3394 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3395 } 3396 break; 3397 case SCTP_SELECTIVE_ACK: 3398 case SCTP_NR_SELECTIVE_ACK: 3399 /* resend the sack */ 3400 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3401 break; 3402 case SCTP_HEARTBEAT_REQUEST: 3403 /* resend a demand HB */ 3404 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3405 /* 3406 * Only retransmit if we KNOW we wont destroy the 3407 * tcb 3408 */ 3409 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3410 } 3411 break; 3412 case SCTP_SHUTDOWN: 3413 sctp_send_shutdown(stcb, net); 3414 break; 3415 case SCTP_SHUTDOWN_ACK: 3416 sctp_send_shutdown_ack(stcb, net); 3417 break; 3418 case SCTP_COOKIE_ECHO: 3419 { 3420 struct sctp_tmit_chunk *cookie; 3421 3422 cookie = NULL; 3423 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3424 sctp_next) { 3425 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3426 break; 3427 } 3428 } 3429 if (cookie) { 3430 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3431 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3432 cookie->sent = SCTP_DATAGRAM_RESEND; 3433 sctp_stop_all_cookie_timers(stcb); 3434 } 3435 } 3436 break; 3437 case SCTP_COOKIE_ACK: 3438 sctp_send_cookie_ack(stcb); 3439 break; 3440 case SCTP_ASCONF_ACK: 3441 /* resend last asconf ack */ 3442 sctp_send_asconf_ack(stcb); 3443 break; 3444 case SCTP_FORWARD_CUM_TSN: 3445 send_forward_tsn(stcb, &stcb->asoc); 3446 break; 3447 /* can't do anything with these */ 3448 case SCTP_PACKET_DROPPED: 3449 case SCTP_INITIATION_ACK: /* this should not happen */ 3450 case SCTP_HEARTBEAT_ACK: 3451 case SCTP_ABORT_ASSOCIATION: 3452 case SCTP_OPERATION_ERROR: 3453 case SCTP_SHUTDOWN_COMPLETE: 3454 case SCTP_ECN_ECHO: 3455 case SCTP_ECN_CWR: 3456 default: 3457 break; 3458 } 3459 return (0); 3460} 3461 3462void 3463sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3464{ 3465 uint32_t i; 3466 uint16_t temp; 3467 3468 /* 3469 * We set things to 0xffff since this is the last delivered sequence 3470 * and we will be sending in 0 after the reset. 3471 */ 3472 3473 if (number_entries) { 3474 for (i = 0; i < number_entries; i++) { 3475 temp = ntohs(list[i]); 3476 if (temp >= stcb->asoc.streamincnt) { 3477 continue; 3478 } 3479 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3480 } 3481 } else { 3482 list = NULL; 3483 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3484 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3485 } 3486 } 3487 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3488} 3489 3490static void 3491sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3492{ 3493 uint32_t i; 3494 uint16_t temp; 3495 3496 if (number_entries > 0) { 3497 for (i = 0; i < number_entries; i++) { 3498 temp = ntohs(list[i]); 3499 if (temp >= stcb->asoc.streamoutcnt) { 3500 /* no such stream */ 3501 continue; 3502 } 3503 stcb->asoc.strmout[temp].next_sequence_send = 0; 3504 } 3505 } else { 3506 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3507 stcb->asoc.strmout[i].next_sequence_send = 0; 3508 } 3509 } 3510 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3511} 3512 3513static void 3514sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3515{ 3516 uint32_t i; 3517 uint16_t temp; 3518 3519 if (number_entries > 0) { 3520 for (i = 0; i < number_entries; i++) { 3521 temp = ntohs(list[i]); 3522 if (temp >= stcb->asoc.streamoutcnt) { 3523 /* no such stream */ 3524 continue; 3525 } 3526 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3527 } 3528 } else { 3529 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3530 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3531 } 3532 } 3533} 3534 3535 3536struct sctp_stream_reset_request * 3537sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3538{ 3539 struct sctp_association *asoc; 3540 struct sctp_chunkhdr *ch; 3541 struct sctp_stream_reset_request *r; 3542 struct sctp_tmit_chunk *chk; 3543 int len, clen; 3544 3545 asoc = &stcb->asoc; 3546 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3547 asoc->stream_reset_outstanding = 0; 3548 return (NULL); 3549 } 3550 if (stcb->asoc.str_reset == NULL) { 3551 asoc->stream_reset_outstanding = 0; 3552 return (NULL); 3553 } 3554 chk = stcb->asoc.str_reset; 3555 if (chk->data == NULL) { 3556 return (NULL); 3557 } 3558 if (bchk) { 3559 /* he wants a copy of the chk pointer */ 3560 *bchk = chk; 3561 } 3562 clen = chk->send_size; 3563 ch = mtod(chk->data, struct sctp_chunkhdr *); 3564 r = (struct sctp_stream_reset_request *)(ch + 1); 3565 if (ntohl(r->request_seq) == seq) { 3566 /* found it */ 3567 return (r); 3568 } 3569 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3570 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3571 /* move to the next one, there can only be a max of two */ 3572 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3573 if (ntohl(r->request_seq) == seq) { 3574 return (r); 3575 } 3576 } 3577 /* that seq is not here */ 3578 return (NULL); 3579} 3580 3581static void 3582sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3583{ 3584 struct sctp_association *asoc; 3585 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3586 3587 if (stcb->asoc.str_reset == NULL) { 3588 return; 3589 } 3590 asoc = &stcb->asoc; 3591 3592 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3593 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3594 TAILQ_REMOVE(&asoc->control_send_queue, 3595 chk, 3596 sctp_next); 3597 if (chk->data) { 3598 sctp_m_freem(chk->data); 3599 chk->data = NULL; 3600 } 3601 asoc->ctrl_queue_cnt--; 3602 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3603 /* sa_ignore NO_NULL_CHK */ 3604 stcb->asoc.str_reset = NULL; 3605} 3606 3607 3608static int 3609sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3610 uint32_t seq, uint32_t action, 3611 struct sctp_stream_reset_response *respin) 3612{ 3613 uint16_t type; 3614 int lparm_len; 3615 struct sctp_association *asoc = &stcb->asoc; 3616 struct sctp_tmit_chunk *chk; 3617 struct sctp_stream_reset_request *req_param; 3618 struct sctp_stream_reset_out_request *req_out_param; 3619 struct sctp_stream_reset_in_request *req_in_param; 3620 uint32_t number_entries; 3621 3622 if (asoc->stream_reset_outstanding == 0) { 3623 /* duplicate */ 3624 return (0); 3625 } 3626 if (seq == stcb->asoc.str_reset_seq_out) { 3627 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3628 if (req_param != NULL) { 3629 stcb->asoc.str_reset_seq_out++; 3630 type = ntohs(req_param->ph.param_type); 3631 lparm_len = ntohs(req_param->ph.param_length); 3632 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3633 int no_clear = 0; 3634 3635 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3636 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3637 asoc->stream_reset_out_is_outstanding = 0; 3638 if (asoc->stream_reset_outstanding) 3639 asoc->stream_reset_outstanding--; 3640 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3641 /* do it */ 3642 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3643 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3644 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3645 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3646 /* 3647 * Set it up so we don't stop 3648 * retransmitting 3649 */ 3650 stcb->asoc.str_reset_seq_out--; 3651 asoc->stream_reset_out_is_outstanding = 1; 3652 no_clear = 1; 3653 } else { 3654 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3655 } 3656 if (no_clear == 0) { 3657 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3658 } 3659 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3660 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3661 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3662 if (asoc->stream_reset_outstanding) 3663 asoc->stream_reset_outstanding--; 3664 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3665 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3666 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3667 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3668 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3669 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3670 } 3671 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3672 /* Ok we now may have more streams */ 3673 int num_stream; 3674 3675 num_stream = stcb->asoc.strm_pending_add_size; 3676 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3677 /* TSNH */ 3678 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3679 } 3680 stcb->asoc.strm_pending_add_size = 0; 3681 if (asoc->stream_reset_outstanding) 3682 asoc->stream_reset_outstanding--; 3683 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3684 /* Put the new streams into effect */ 3685 int i; 3686 3687 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3688 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3689 } 3690 asoc->streamoutcnt += num_stream; 3691 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3692 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3693 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3694 SCTP_STREAM_CHANGE_DENIED); 3695 } else { 3696 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3697 SCTP_STREAM_CHANGE_FAILED); 3698 } 3699 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3700 if (asoc->stream_reset_outstanding) 3701 asoc->stream_reset_outstanding--; 3702 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3703 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3704 SCTP_STREAM_CHANGE_DENIED); 3705 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3706 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3707 SCTP_STREAM_CHANGE_FAILED); 3708 } 3709 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3710 /** 3711 * a) Adopt the new in tsn. 3712 * b) reset the map 3713 * c) Adopt the new out-tsn 3714 */ 3715 struct sctp_stream_reset_response_tsn *resp; 3716 struct sctp_forward_tsn_chunk fwdtsn; 3717 int abort_flag = 0; 3718 3719 if (respin == NULL) { 3720 /* huh ? */ 3721 return (0); 3722 } 3723 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3724 return (0); 3725 } 3726 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3727 resp = (struct sctp_stream_reset_response_tsn *)respin; 3728 asoc->stream_reset_outstanding--; 3729 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3730 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3731 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3732 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3733 if (abort_flag) { 3734 return (1); 3735 } 3736 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3737 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3738 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3739 } 3740 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3741 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3742 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3743 3744 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3745 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3746 3747 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3748 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3749 3750 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3751 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3752 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3753 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3754 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3755 SCTP_ASSOC_RESET_DENIED); 3756 } else { 3757 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3758 SCTP_ASSOC_RESET_FAILED); 3759 } 3760 } 3761 /* get rid of the request and get the request flags */ 3762 if (asoc->stream_reset_outstanding == 0) { 3763 sctp_clean_up_stream_reset(stcb); 3764 } 3765 } 3766 } 3767 if (asoc->stream_reset_outstanding == 0) { 3768 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3769 } 3770 return (0); 3771} 3772 3773static void 3774sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3775 struct sctp_tmit_chunk *chk, 3776 struct sctp_stream_reset_in_request *req, int trunc) 3777{ 3778 uint32_t seq; 3779 int len, i; 3780 int number_entries; 3781 uint16_t temp; 3782 3783 /* 3784 * peer wants me to send a str-reset to him for my outgoing seq's if 3785 * seq_in is right. 3786 */ 3787 struct sctp_association *asoc = &stcb->asoc; 3788 3789 seq = ntohl(req->request_seq); 3790 if (asoc->str_reset_seq_in == seq) { 3791 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3792 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3793 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3794 } else if (trunc) { 3795 /* Can't do it, since they exceeded our buffer size */ 3796 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3797 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3798 len = ntohs(req->ph.param_length); 3799 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3800 if (number_entries) { 3801 for (i = 0; i < number_entries; i++) { 3802 temp = ntohs(req->list_of_streams[i]); 3803 if (temp >= stcb->asoc.streamoutcnt) { 3804 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3805 goto bad_boy; 3806 } 3807 req->list_of_streams[i] = temp; 3808 } 3809 for (i = 0; i < number_entries; i++) { 3810 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3811 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3812 } 3813 } 3814 } else { 3815 /* Its all */ 3816 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3817 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3818 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3819 } 3820 } 3821 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3822 } else { 3823 /* Can't do it, since we have sent one out */ 3824 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3825 } 3826bad_boy: 3827 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3828 asoc->str_reset_seq_in++; 3829 } else if (asoc->str_reset_seq_in - 1 == seq) { 3830 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3831 } else if (asoc->str_reset_seq_in - 2 == seq) { 3832 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3833 } else { 3834 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3835 } 3836 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3837} 3838 3839static int 3840sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3841 struct sctp_tmit_chunk *chk, 3842 struct sctp_stream_reset_tsn_request *req) 3843{ 3844 /* reset all in and out and update the tsn */ 3845 /* 3846 * A) reset my str-seq's on in and out. B) Select a receive next, 3847 * and set cum-ack to it. Also process this selected number as a 3848 * fwd-tsn as well. C) set in the response my next sending seq. 3849 */ 3850 struct sctp_forward_tsn_chunk fwdtsn; 3851 struct sctp_association *asoc = &stcb->asoc; 3852 int abort_flag = 0; 3853 uint32_t seq; 3854 3855 seq = ntohl(req->request_seq); 3856 if (asoc->str_reset_seq_in == seq) { 3857 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3858 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3859 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3860 } else { 3861 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3862 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3863 fwdtsn.ch.chunk_flags = 0; 3864 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3865 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3866 if (abort_flag) { 3867 return (1); 3868 } 3869 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3870 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3871 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3872 } 3873 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3874 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3875 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3876 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3877 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3878 atomic_add_int(&asoc->sending_seq, 1); 3879 /* save off historical data for retrans */ 3880 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3881 asoc->last_sending_seq[0] = asoc->sending_seq; 3882 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3883 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3884 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3885 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3886 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3887 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3888 } 3889 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3890 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3891 asoc->str_reset_seq_in++; 3892 } else if (asoc->str_reset_seq_in - 1 == seq) { 3893 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3894 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3895 } else if (asoc->str_reset_seq_in - 2 == seq) { 3896 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3897 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3898 } else { 3899 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3900 } 3901 return (0); 3902} 3903 3904static void 3905sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3906 struct sctp_tmit_chunk *chk, 3907 struct sctp_stream_reset_out_request *req, int trunc) 3908{ 3909 uint32_t seq, tsn; 3910 int number_entries, len; 3911 struct sctp_association *asoc = &stcb->asoc; 3912 3913 seq = ntohl(req->request_seq); 3914 3915 /* now if its not a duplicate we process it */ 3916 if (asoc->str_reset_seq_in == seq) { 3917 len = ntohs(req->ph.param_length); 3918 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3919 /* 3920 * the sender is resetting, handle the list issue.. we must 3921 * a) verify if we can do the reset, if so no problem b) If 3922 * we can't do the reset we must copy the request. c) queue 3923 * it, and setup the data in processor to trigger it off 3924 * when needed and dequeue all the queued data. 3925 */ 3926 tsn = ntohl(req->send_reset_at_tsn); 3927 3928 /* move the reset action back one */ 3929 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3930 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3931 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3932 } else if (trunc) { 3933 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3934 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3935 /* we can do it now */ 3936 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3937 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3938 } else { 3939 /* 3940 * we must queue it up and thus wait for the TSN's 3941 * to arrive that are at or before tsn 3942 */ 3943 struct sctp_stream_reset_list *liste; 3944 int siz; 3945 3946 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3947 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3948 siz, SCTP_M_STRESET); 3949 if (liste == NULL) { 3950 /* gak out of memory */ 3951 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3952 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3953 return; 3954 } 3955 liste->seq = seq; 3956 liste->tsn = tsn; 3957 liste->number_entries = number_entries; 3958 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3959 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3960 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3961 } 3962 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3963 asoc->str_reset_seq_in++; 3964 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3965 /* 3966 * one seq back, just echo back last action since my 3967 * response was lost. 3968 */ 3969 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3970 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3971 /* 3972 * two seq back, just echo back last action since my 3973 * response was lost. 3974 */ 3975 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3976 } else { 3977 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3978 } 3979} 3980 3981static void 3982sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3983 struct sctp_stream_reset_add_strm *str_add) 3984{ 3985 /* 3986 * Peer is requesting to add more streams. If its within our 3987 * max-streams we will allow it. 3988 */ 3989 uint32_t num_stream, i; 3990 uint32_t seq; 3991 struct sctp_association *asoc = &stcb->asoc; 3992 struct sctp_queued_to_read *ctl, *nctl; 3993 3994 /* Get the number. */ 3995 seq = ntohl(str_add->request_seq); 3996 num_stream = ntohs(str_add->number_of_streams); 3997 /* Now what would be the new total? */ 3998 if (asoc->str_reset_seq_in == seq) { 3999 num_stream += stcb->asoc.streamincnt; 4000 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4001 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4002 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4003 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4004 (num_stream > 0xffff)) { 4005 /* We must reject it they ask for to many */ 4006 denied: 4007 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4008 } else { 4009 /* Ok, we can do that :-) */ 4010 struct sctp_stream_in *oldstrm; 4011 4012 /* save off the old */ 4013 oldstrm = stcb->asoc.strmin; 4014 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4015 (num_stream * sizeof(struct sctp_stream_in)), 4016 SCTP_M_STRMI); 4017 if (stcb->asoc.strmin == NULL) { 4018 stcb->asoc.strmin = oldstrm; 4019 goto denied; 4020 } 4021 /* copy off the old data */ 4022 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4023 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4024 stcb->asoc.strmin[i].stream_no = i; 4025 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4026 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4027 /* now anything on those queues? */ 4028 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 4029 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 4030 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 4031 } 4032 } 4033 /* Init the new streams */ 4034 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4035 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4036 stcb->asoc.strmin[i].stream_no = i; 4037 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 4038 stcb->asoc.strmin[i].delivery_started = 0; 4039 } 4040 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4041 /* update the size */ 4042 stcb->asoc.streamincnt = num_stream; 4043 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4044 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4045 } 4046 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4047 asoc->str_reset_seq_in++; 4048 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4049 /* 4050 * one seq back, just echo back last action since my 4051 * response was lost. 4052 */ 4053 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4054 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4055 /* 4056 * two seq back, just echo back last action since my 4057 * response was lost. 4058 */ 4059 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4060 } else { 4061 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4062 4063 } 4064} 4065 4066static void 4067sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4068 struct sctp_stream_reset_add_strm *str_add) 4069{ 4070 /* 4071 * Peer is requesting to add more streams. If its within our 4072 * max-streams we will allow it. 4073 */ 4074 uint16_t num_stream; 4075 uint32_t seq; 4076 struct sctp_association *asoc = &stcb->asoc; 4077 4078 /* Get the number. */ 4079 seq = ntohl(str_add->request_seq); 4080 num_stream = ntohs(str_add->number_of_streams); 4081 /* Now what would be the new total? */ 4082 if (asoc->str_reset_seq_in == seq) { 4083 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4084 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4085 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4086 } else if (stcb->asoc.stream_reset_outstanding) { 4087 /* We must reject it we have something pending */ 4088 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4089 } else { 4090 /* Ok, we can do that :-) */ 4091 int mychk; 4092 4093 mychk = stcb->asoc.streamoutcnt; 4094 mychk += num_stream; 4095 if (mychk < 0x10000) { 4096 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4097 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4098 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4099 } 4100 } else { 4101 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4102 } 4103 } 4104 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4105 asoc->str_reset_seq_in++; 4106 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4107 /* 4108 * one seq back, just echo back last action since my 4109 * response was lost. 4110 */ 4111 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4112 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4113 /* 4114 * two seq back, just echo back last action since my 4115 * response was lost. 4116 */ 4117 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4118 } else { 4119 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4120 } 4121} 4122 4123#ifdef __GNUC__ 4124__attribute__((noinline)) 4125#endif 4126 static int 4127 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4128 struct sctp_chunkhdr *ch_req) 4129{ 4130 uint16_t remaining_length, param_len, ptype; 4131 struct sctp_paramhdr pstore; 4132 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4133 uint32_t seq = 0; 4134 int num_req = 0; 4135 int trunc = 0; 4136 struct sctp_tmit_chunk *chk; 4137 struct sctp_chunkhdr *ch; 4138 struct sctp_paramhdr *ph; 4139 int ret_code = 0; 4140 int num_param = 0; 4141 4142 /* now it may be a reset or a reset-response */ 4143 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4144 4145 /* setup for adding the response */ 4146 sctp_alloc_a_chunk(stcb, chk); 4147 if (chk == NULL) { 4148 return (ret_code); 4149 } 4150 chk->copy_by_ref = 0; 4151 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4152 chk->rec.chunk_id.can_take_data = 0; 4153 chk->flags = 0; 4154 chk->asoc = &stcb->asoc; 4155 chk->no_fr_allowed = 0; 4156 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4157 chk->book_size_scale = 0; 4158 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4159 if (chk->data == NULL) { 4160strres_nochunk: 4161 if (chk->data) { 4162 sctp_m_freem(chk->data); 4163 chk->data = NULL; 4164 } 4165 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4166 return (ret_code); 4167 } 4168 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4169 4170 /* setup chunk parameters */ 4171 chk->sent = SCTP_DATAGRAM_UNSENT; 4172 chk->snd_count = 0; 4173 chk->whoTo = NULL; 4174 4175 ch = mtod(chk->data, struct sctp_chunkhdr *); 4176 ch->chunk_type = SCTP_STREAM_RESET; 4177 ch->chunk_flags = 0; 4178 ch->chunk_length = htons(chk->send_size); 4179 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4180 offset += sizeof(struct sctp_chunkhdr); 4181 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4182 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4183 if (ph == NULL) { 4184 /* TSNH */ 4185 break; 4186 } 4187 param_len = ntohs(ph->param_length); 4188 if ((param_len > remaining_length) || 4189 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4190 /* bad parameter length */ 4191 break; 4192 } 4193 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4194 (uint8_t *) & cstore); 4195 if (ph == NULL) { 4196 /* TSNH */ 4197 break; 4198 } 4199 ptype = ntohs(ph->param_type); 4200 num_param++; 4201 if (param_len > sizeof(cstore)) { 4202 trunc = 1; 4203 } else { 4204 trunc = 0; 4205 } 4206 if (num_param > SCTP_MAX_RESET_PARAMS) { 4207 /* hit the max of parameters already sorry.. */ 4208 break; 4209 } 4210 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4211 struct sctp_stream_reset_out_request *req_out; 4212 4213 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4214 break; 4215 } 4216 req_out = (struct sctp_stream_reset_out_request *)ph; 4217 num_req++; 4218 if (stcb->asoc.stream_reset_outstanding) { 4219 seq = ntohl(req_out->response_seq); 4220 if (seq == stcb->asoc.str_reset_seq_out) { 4221 /* implicit ack */ 4222 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4223 } 4224 } 4225 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4226 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4227 struct sctp_stream_reset_add_strm *str_add; 4228 4229 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4230 break; 4231 } 4232 str_add = (struct sctp_stream_reset_add_strm *)ph; 4233 num_req++; 4234 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4235 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4236 struct sctp_stream_reset_add_strm *str_add; 4237 4238 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4239 break; 4240 } 4241 str_add = (struct sctp_stream_reset_add_strm *)ph; 4242 num_req++; 4243 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4244 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4245 struct sctp_stream_reset_in_request *req_in; 4246 4247 num_req++; 4248 req_in = (struct sctp_stream_reset_in_request *)ph; 4249 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4250 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4251 struct sctp_stream_reset_tsn_request *req_tsn; 4252 4253 num_req++; 4254 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4255 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4256 ret_code = 1; 4257 goto strres_nochunk; 4258 } 4259 /* no more */ 4260 break; 4261 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4262 struct sctp_stream_reset_response *resp; 4263 uint32_t result; 4264 4265 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4266 break; 4267 } 4268 resp = (struct sctp_stream_reset_response *)ph; 4269 seq = ntohl(resp->response_seq); 4270 result = ntohl(resp->result); 4271 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4272 ret_code = 1; 4273 goto strres_nochunk; 4274 } 4275 } else { 4276 break; 4277 } 4278 offset += SCTP_SIZE32(param_len); 4279 if (remaining_length >= SCTP_SIZE32(param_len)) { 4280 remaining_length -= SCTP_SIZE32(param_len); 4281 } else { 4282 remaining_length = 0; 4283 } 4284 } 4285 if (num_req == 0) { 4286 /* we have no response free the stuff */ 4287 goto strres_nochunk; 4288 } 4289 /* ok we have a chunk to link in */ 4290 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4291 chk, 4292 sctp_next); 4293 stcb->asoc.ctrl_queue_cnt++; 4294 return (ret_code); 4295} 4296 4297/* 4298 * Handle a router or endpoints report of a packet loss, there are two ways 4299 * to handle this, either we get the whole packet and must disect it 4300 * ourselves (possibly with truncation and or corruption) or it is a summary 4301 * from a middle box that did the disectting for us. 4302 */ 4303static void 4304sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4305 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4306{ 4307 uint32_t bottle_bw, on_queue; 4308 uint16_t trunc_len; 4309 unsigned int chlen; 4310 unsigned int at; 4311 struct sctp_chunk_desc desc; 4312 struct sctp_chunkhdr *ch; 4313 4314 chlen = ntohs(cp->ch.chunk_length); 4315 chlen -= sizeof(struct sctp_pktdrop_chunk); 4316 /* XXX possible chlen underflow */ 4317 if (chlen == 0) { 4318 ch = NULL; 4319 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4320 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4321 } else { 4322 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4323 chlen -= sizeof(struct sctphdr); 4324 /* XXX possible chlen underflow */ 4325 memset(&desc, 0, sizeof(desc)); 4326 } 4327 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4328 if (trunc_len > limit) { 4329 trunc_len = limit; 4330 } 4331 /* now the chunks themselves */ 4332 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4333 desc.chunk_type = ch->chunk_type; 4334 /* get amount we need to move */ 4335 at = ntohs(ch->chunk_length); 4336 if (at < sizeof(struct sctp_chunkhdr)) { 4337 /* corrupt chunk, maybe at the end? */ 4338 SCTP_STAT_INCR(sctps_pdrpcrupt); 4339 break; 4340 } 4341 if (trunc_len == 0) { 4342 /* we are supposed to have all of it */ 4343 if (at > chlen) { 4344 /* corrupt skip it */ 4345 SCTP_STAT_INCR(sctps_pdrpcrupt); 4346 break; 4347 } 4348 } else { 4349 /* is there enough of it left ? */ 4350 if (desc.chunk_type == SCTP_DATA) { 4351 if (chlen < (sizeof(struct sctp_data_chunk) + 4352 sizeof(desc.data_bytes))) { 4353 break; 4354 } 4355 } else { 4356 if (chlen < sizeof(struct sctp_chunkhdr)) { 4357 break; 4358 } 4359 } 4360 } 4361 if (desc.chunk_type == SCTP_DATA) { 4362 /* can we get out the tsn? */ 4363 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4364 SCTP_STAT_INCR(sctps_pdrpmbda); 4365 4366 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4367 /* yep */ 4368 struct sctp_data_chunk *dcp; 4369 uint8_t *ddp; 4370 unsigned int iii; 4371 4372 dcp = (struct sctp_data_chunk *)ch; 4373 ddp = (uint8_t *) (dcp + 1); 4374 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4375 desc.data_bytes[iii] = ddp[iii]; 4376 } 4377 desc.tsn_ifany = dcp->dp.tsn; 4378 } else { 4379 /* nope we are done. */ 4380 SCTP_STAT_INCR(sctps_pdrpnedat); 4381 break; 4382 } 4383 } else { 4384 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4385 SCTP_STAT_INCR(sctps_pdrpmbct); 4386 } 4387 4388 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4389 SCTP_STAT_INCR(sctps_pdrppdbrk); 4390 break; 4391 } 4392 if (SCTP_SIZE32(at) > chlen) { 4393 break; 4394 } 4395 chlen -= SCTP_SIZE32(at); 4396 if (chlen < sizeof(struct sctp_chunkhdr)) { 4397 /* done, none left */ 4398 break; 4399 } 4400 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4401 } 4402 /* Now update any rwnd --- possibly */ 4403 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4404 /* From a peer, we get a rwnd report */ 4405 uint32_t a_rwnd; 4406 4407 SCTP_STAT_INCR(sctps_pdrpfehos); 4408 4409 bottle_bw = ntohl(cp->bottle_bw); 4410 on_queue = ntohl(cp->current_onq); 4411 if (bottle_bw && on_queue) { 4412 /* a rwnd report is in here */ 4413 if (bottle_bw > on_queue) 4414 a_rwnd = bottle_bw - on_queue; 4415 else 4416 a_rwnd = 0; 4417 4418 if (a_rwnd == 0) 4419 stcb->asoc.peers_rwnd = 0; 4420 else { 4421 if (a_rwnd > stcb->asoc.total_flight) { 4422 stcb->asoc.peers_rwnd = 4423 a_rwnd - stcb->asoc.total_flight; 4424 } else { 4425 stcb->asoc.peers_rwnd = 0; 4426 } 4427 if (stcb->asoc.peers_rwnd < 4428 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4429 /* SWS sender side engages */ 4430 stcb->asoc.peers_rwnd = 0; 4431 } 4432 } 4433 } 4434 } else { 4435 SCTP_STAT_INCR(sctps_pdrpfmbox); 4436 } 4437 4438 /* now middle boxes in sat networks get a cwnd bump */ 4439 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4440 (stcb->asoc.sat_t3_loss_recovery == 0) && 4441 (stcb->asoc.sat_network)) { 4442 /* 4443 * This is debateable but for sat networks it makes sense 4444 * Note if a T3 timer has went off, we will prohibit any 4445 * changes to cwnd until we exit the t3 loss recovery. 4446 */ 4447 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4448 net, cp, &bottle_bw, &on_queue); 4449 } 4450} 4451 4452/* 4453 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4454 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4455 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4456 * length of the complete packet outputs: - length: modified to remaining 4457 * length after control processing - netp: modified to new sctp_nets after 4458 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4459 * bad packet,...) otherwise return the tcb for this packet 4460 */ 4461#ifdef __GNUC__ 4462__attribute__((noinline)) 4463#endif 4464 static struct sctp_tcb * 4465 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4466 struct sockaddr *src, struct sockaddr *dst, 4467 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4468 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4469 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4470 uint32_t vrf_id, uint16_t port) 4471{ 4472 struct sctp_association *asoc; 4473 struct mbuf *op_err; 4474 char msg[SCTP_DIAG_INFO_LEN]; 4475 uint32_t vtag_in; 4476 int num_chunks = 0; /* number of control chunks processed */ 4477 uint32_t chk_length; 4478 int ret; 4479 int abort_no_unlock = 0; 4480 int ecne_seen = 0; 4481 4482 /* 4483 * How big should this be, and should it be alloc'd? Lets try the 4484 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4485 * until we get into jumbo grams and such.. 4486 */ 4487 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4488 struct sctp_tcb *locked_tcb = stcb; 4489 int got_auth = 0; 4490 uint32_t auth_offset = 0, auth_len = 0; 4491 int auth_skipped = 0; 4492 int asconf_cnt = 0; 4493 4494#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4495 struct socket *so; 4496 4497#endif 4498 4499 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4500 iphlen, *offset, length, (void *)stcb); 4501 4502 /* validate chunk header length... */ 4503 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4504 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4505 ntohs(ch->chunk_length)); 4506 if (locked_tcb) { 4507 SCTP_TCB_UNLOCK(locked_tcb); 4508 } 4509 return (NULL); 4510 } 4511 /* 4512 * validate the verification tag 4513 */ 4514 vtag_in = ntohl(sh->v_tag); 4515 4516 if (locked_tcb) { 4517 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4518 } 4519 if (ch->chunk_type == SCTP_INITIATION) { 4520 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4521 ntohs(ch->chunk_length), vtag_in); 4522 if (vtag_in != 0) { 4523 /* protocol error- silently discard... */ 4524 SCTP_STAT_INCR(sctps_badvtag); 4525 if (locked_tcb) { 4526 SCTP_TCB_UNLOCK(locked_tcb); 4527 } 4528 return (NULL); 4529 } 4530 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4531 /* 4532 * If there is no stcb, skip the AUTH chunk and process 4533 * later after a stcb is found (to validate the lookup was 4534 * valid. 4535 */ 4536 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4537 (stcb == NULL) && 4538 (inp->auth_supported == 1)) { 4539 /* save this chunk for later processing */ 4540 auth_skipped = 1; 4541 auth_offset = *offset; 4542 auth_len = ntohs(ch->chunk_length); 4543 4544 /* (temporarily) move past this chunk */ 4545 *offset += SCTP_SIZE32(auth_len); 4546 if (*offset >= length) { 4547 /* no more data left in the mbuf chain */ 4548 *offset = length; 4549 if (locked_tcb) { 4550 SCTP_TCB_UNLOCK(locked_tcb); 4551 } 4552 return (NULL); 4553 } 4554 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4555 sizeof(struct sctp_chunkhdr), chunk_buf); 4556 } 4557 if (ch == NULL) { 4558 /* Help */ 4559 *offset = length; 4560 if (locked_tcb) { 4561 SCTP_TCB_UNLOCK(locked_tcb); 4562 } 4563 return (NULL); 4564 } 4565 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4566 goto process_control_chunks; 4567 } 4568 /* 4569 * first check if it's an ASCONF with an unknown src addr we 4570 * need to look inside to find the association 4571 */ 4572 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4573 struct sctp_chunkhdr *asconf_ch = ch; 4574 uint32_t asconf_offset = 0, asconf_len = 0; 4575 4576 /* inp's refcount may be reduced */ 4577 SCTP_INP_INCR_REF(inp); 4578 4579 asconf_offset = *offset; 4580 do { 4581 asconf_len = ntohs(asconf_ch->chunk_length); 4582 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4583 break; 4584 stcb = sctp_findassociation_ep_asconf(m, 4585 *offset, 4586 dst, 4587 sh, &inp, netp, vrf_id); 4588 if (stcb != NULL) 4589 break; 4590 asconf_offset += SCTP_SIZE32(asconf_len); 4591 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4592 sizeof(struct sctp_chunkhdr), chunk_buf); 4593 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4594 if (stcb == NULL) { 4595 /* 4596 * reduce inp's refcount if not reduced in 4597 * sctp_findassociation_ep_asconf(). 4598 */ 4599 SCTP_INP_DECR_REF(inp); 4600 } else { 4601 locked_tcb = stcb; 4602 } 4603 4604 /* now go back and verify any auth chunk to be sure */ 4605 if (auth_skipped && (stcb != NULL)) { 4606 struct sctp_auth_chunk *auth; 4607 4608 auth = (struct sctp_auth_chunk *) 4609 sctp_m_getptr(m, auth_offset, 4610 auth_len, chunk_buf); 4611 got_auth = 1; 4612 auth_skipped = 0; 4613 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4614 auth_offset)) { 4615 /* auth HMAC failed so dump it */ 4616 *offset = length; 4617 if (locked_tcb) { 4618 SCTP_TCB_UNLOCK(locked_tcb); 4619 } 4620 return (NULL); 4621 } else { 4622 /* remaining chunks are HMAC checked */ 4623 stcb->asoc.authenticated = 1; 4624 } 4625 } 4626 } 4627 if (stcb == NULL) { 4628 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4629 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4630 msg); 4631 /* no association, so it's out of the blue... */ 4632 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4633 mflowtype, mflowid, inp->fibnum, 4634 vrf_id, port); 4635 *offset = length; 4636 if (locked_tcb) { 4637 SCTP_TCB_UNLOCK(locked_tcb); 4638 } 4639 return (NULL); 4640 } 4641 asoc = &stcb->asoc; 4642 /* ABORT and SHUTDOWN can use either v_tag... */ 4643 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4644 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4645 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4646 /* Take the T-bit always into account. */ 4647 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4648 (vtag_in == asoc->my_vtag)) || 4649 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4650 (vtag_in == asoc->peer_vtag))) { 4651 /* this is valid */ 4652 } else { 4653 /* drop this packet... */ 4654 SCTP_STAT_INCR(sctps_badvtag); 4655 if (locked_tcb) { 4656 SCTP_TCB_UNLOCK(locked_tcb); 4657 } 4658 return (NULL); 4659 } 4660 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4661 if (vtag_in != asoc->my_vtag) { 4662 /* 4663 * this could be a stale SHUTDOWN-ACK or the 4664 * peer never got the SHUTDOWN-COMPLETE and 4665 * is still hung; we have started a new asoc 4666 * but it won't complete until the shutdown 4667 * is completed 4668 */ 4669 if (locked_tcb) { 4670 SCTP_TCB_UNLOCK(locked_tcb); 4671 } 4672 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4673 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4674 msg); 4675 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4676 sh, inp, op_err, 4677 mflowtype, mflowid, fibnum, 4678 vrf_id, port); 4679 return (NULL); 4680 } 4681 } else { 4682 /* for all other chunks, vtag must match */ 4683 if (vtag_in != asoc->my_vtag) { 4684 /* invalid vtag... */ 4685 SCTPDBG(SCTP_DEBUG_INPUT3, 4686 "invalid vtag: %xh, expect %xh\n", 4687 vtag_in, asoc->my_vtag); 4688 SCTP_STAT_INCR(sctps_badvtag); 4689 if (locked_tcb) { 4690 SCTP_TCB_UNLOCK(locked_tcb); 4691 } 4692 *offset = length; 4693 return (NULL); 4694 } 4695 } 4696 } /* end if !SCTP_COOKIE_ECHO */ 4697 /* 4698 * process all control chunks... 4699 */ 4700 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4701 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4702 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4703 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4704 /* implied cookie-ack.. we must have lost the ack */ 4705 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4706 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4707 stcb->asoc.overall_error_count, 4708 0, 4709 SCTP_FROM_SCTP_INPUT, 4710 __LINE__); 4711 } 4712 stcb->asoc.overall_error_count = 0; 4713 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4714 *netp); 4715 } 4716process_control_chunks: 4717 while (IS_SCTP_CONTROL(ch)) { 4718 /* validate chunk length */ 4719 chk_length = ntohs(ch->chunk_length); 4720 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4721 ch->chunk_type, chk_length); 4722 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4723 if (chk_length < sizeof(*ch) || 4724 (*offset + (int)chk_length) > length) { 4725 *offset = length; 4726 if (locked_tcb) { 4727 SCTP_TCB_UNLOCK(locked_tcb); 4728 } 4729 return (NULL); 4730 } 4731 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4732 /* 4733 * INIT-ACK only gets the init ack "header" portion only 4734 * because we don't have to process the peer's COOKIE. All 4735 * others get a complete chunk. 4736 */ 4737 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4738 (ch->chunk_type == SCTP_INITIATION)) { 4739 /* get an init-ack chunk */ 4740 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4741 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4742 if (ch == NULL) { 4743 *offset = length; 4744 if (locked_tcb) { 4745 SCTP_TCB_UNLOCK(locked_tcb); 4746 } 4747 return (NULL); 4748 } 4749 } else { 4750 /* For cookies and all other chunks. */ 4751 if (chk_length > sizeof(chunk_buf)) { 4752 /* 4753 * use just the size of the chunk buffer so 4754 * the front part of our chunks fit in 4755 * contiguous space up to the chunk buffer 4756 * size (508 bytes). For chunks that need to 4757 * get more than that they must use the 4758 * sctp_m_getptr() function or other means 4759 * (e.g. know how to parse mbuf chains). 4760 * Cookies do this already. 4761 */ 4762 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4763 (sizeof(chunk_buf) - 4), 4764 chunk_buf); 4765 if (ch == NULL) { 4766 *offset = length; 4767 if (locked_tcb) { 4768 SCTP_TCB_UNLOCK(locked_tcb); 4769 } 4770 return (NULL); 4771 } 4772 } else { 4773 /* We can fit it all */ 4774 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4775 chk_length, chunk_buf); 4776 if (ch == NULL) { 4777 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4778 *offset = length; 4779 if (locked_tcb) { 4780 SCTP_TCB_UNLOCK(locked_tcb); 4781 } 4782 return (NULL); 4783 } 4784 } 4785 } 4786 num_chunks++; 4787 /* Save off the last place we got a control from */ 4788 if (stcb != NULL) { 4789 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4790 /* 4791 * allow last_control to be NULL if 4792 * ASCONF... ASCONF processing will find the 4793 * right net later 4794 */ 4795 if ((netp != NULL) && (*netp != NULL)) 4796 stcb->asoc.last_control_chunk_from = *netp; 4797 } 4798 } 4799#ifdef SCTP_AUDITING_ENABLED 4800 sctp_audit_log(0xB0, ch->chunk_type); 4801#endif 4802 4803 /* check to see if this chunk required auth, but isn't */ 4804 if ((stcb != NULL) && 4805 (stcb->asoc.auth_supported == 1) && 4806 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4807 !stcb->asoc.authenticated) { 4808 /* "silently" ignore */ 4809 SCTP_STAT_INCR(sctps_recvauthmissing); 4810 goto next_chunk; 4811 } 4812 switch (ch->chunk_type) { 4813 case SCTP_INITIATION: 4814 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4815 /* The INIT chunk must be the only chunk. */ 4816 if ((num_chunks > 1) || 4817 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4818 /* RFC 4960 requires that no ABORT is sent */ 4819 *offset = length; 4820 if (locked_tcb) { 4821 SCTP_TCB_UNLOCK(locked_tcb); 4822 } 4823 return (NULL); 4824 } 4825 /* Honor our resource limit. */ 4826 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4827 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4828 sctp_abort_association(inp, stcb, m, iphlen, 4829 src, dst, sh, op_err, 4830 mflowtype, mflowid, 4831 vrf_id, port); 4832 *offset = length; 4833 return (NULL); 4834 } 4835 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4836 (struct sctp_init_chunk *)ch, inp, 4837 stcb, &abort_no_unlock, 4838 mflowtype, mflowid, 4839 vrf_id, port); 4840 *offset = length; 4841 if ((!abort_no_unlock) && (locked_tcb)) { 4842 SCTP_TCB_UNLOCK(locked_tcb); 4843 } 4844 return (NULL); 4845 break; 4846 case SCTP_PAD_CHUNK: 4847 break; 4848 case SCTP_INITIATION_ACK: 4849 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4850 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4851 /* We are not interested anymore */ 4852 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4853 ; 4854 } else { 4855 if (locked_tcb != stcb) { 4856 /* Very unlikely */ 4857 SCTP_TCB_UNLOCK(locked_tcb); 4858 } 4859 *offset = length; 4860 if (stcb) { 4861#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4862 so = SCTP_INP_SO(inp); 4863 atomic_add_int(&stcb->asoc.refcnt, 1); 4864 SCTP_TCB_UNLOCK(stcb); 4865 SCTP_SOCKET_LOCK(so, 1); 4866 SCTP_TCB_LOCK(stcb); 4867 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4868#endif 4869 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4870 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4871#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4872 SCTP_SOCKET_UNLOCK(so, 1); 4873#endif 4874 } 4875 return (NULL); 4876 } 4877 } 4878 /* The INIT-ACK chunk must be the only chunk. */ 4879 if ((num_chunks > 1) || 4880 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4881 *offset = length; 4882 if (locked_tcb) { 4883 SCTP_TCB_UNLOCK(locked_tcb); 4884 } 4885 return (NULL); 4886 } 4887 if ((netp) && (*netp)) { 4888 ret = sctp_handle_init_ack(m, iphlen, *offset, 4889 src, dst, sh, 4890 (struct sctp_init_ack_chunk *)ch, 4891 stcb, *netp, 4892 &abort_no_unlock, 4893 mflowtype, mflowid, 4894 vrf_id); 4895 } else { 4896 ret = -1; 4897 } 4898 *offset = length; 4899 if (abort_no_unlock) { 4900 return (NULL); 4901 } 4902 /* 4903 * Special case, I must call the output routine to 4904 * get the cookie echoed 4905 */ 4906 if ((stcb != NULL) && (ret == 0)) { 4907 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4908 } 4909 if (locked_tcb) { 4910 SCTP_TCB_UNLOCK(locked_tcb); 4911 } 4912 return (NULL); 4913 break; 4914 case SCTP_SELECTIVE_ACK: 4915 { 4916 struct sctp_sack_chunk *sack; 4917 int abort_now = 0; 4918 uint32_t a_rwnd, cum_ack; 4919 uint16_t num_seg, num_dup; 4920 uint8_t flags; 4921 int offset_seg, offset_dup; 4922 4923 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4924 SCTP_STAT_INCR(sctps_recvsacks); 4925 if (stcb == NULL) { 4926 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4927 break; 4928 } 4929 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4930 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4931 break; 4932 } 4933 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4934 /*- 4935 * If we have sent a shutdown-ack, we will pay no 4936 * attention to a sack sent in to us since 4937 * we don't care anymore. 4938 */ 4939 break; 4940 } 4941 sack = (struct sctp_sack_chunk *)ch; 4942 flags = ch->chunk_flags; 4943 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4944 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4945 num_dup = ntohs(sack->sack.num_dup_tsns); 4946 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4947 if (sizeof(struct sctp_sack_chunk) + 4948 num_seg * sizeof(struct sctp_gap_ack_block) + 4949 num_dup * sizeof(uint32_t) != chk_length) { 4950 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4951 break; 4952 } 4953 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4954 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4955 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4956 cum_ack, num_seg, a_rwnd); 4957 stcb->asoc.seen_a_sack_this_pkt = 1; 4958 if ((stcb->asoc.pr_sctp_cnt == 0) && 4959 (num_seg == 0) && 4960 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4961 (stcb->asoc.saw_sack_with_frags == 0) && 4962 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4963 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4964 ) { 4965 /* 4966 * We have a SIMPLE sack having no 4967 * prior segments and data on sent 4968 * queue to be acked.. Use the 4969 * faster path sack processing. We 4970 * also allow window update sacks 4971 * with no missing segments to go 4972 * this way too. 4973 */ 4974 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4975 } else { 4976 if (netp && *netp) 4977 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4978 num_seg, 0, num_dup, &abort_now, flags, 4979 cum_ack, a_rwnd, ecne_seen); 4980 } 4981 if (abort_now) { 4982 /* ABORT signal from sack processing */ 4983 *offset = length; 4984 return (NULL); 4985 } 4986 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4987 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4988 (stcb->asoc.stream_queue_cnt == 0)) { 4989 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4990 } 4991 } 4992 break; 4993 /* 4994 * EY - nr_sack: If the received chunk is an 4995 * nr_sack chunk 4996 */ 4997 case SCTP_NR_SELECTIVE_ACK: 4998 { 4999 struct sctp_nr_sack_chunk *nr_sack; 5000 int abort_now = 0; 5001 uint32_t a_rwnd, cum_ack; 5002 uint16_t num_seg, num_nr_seg, num_dup; 5003 uint8_t flags; 5004 int offset_seg, offset_dup; 5005 5006 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5007 SCTP_STAT_INCR(sctps_recvsacks); 5008 if (stcb == NULL) { 5009 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5010 break; 5011 } 5012 if (stcb->asoc.nrsack_supported == 0) { 5013 goto unknown_chunk; 5014 } 5015 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5016 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5017 break; 5018 } 5019 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5020 /*- 5021 * If we have sent a shutdown-ack, we will pay no 5022 * attention to a sack sent in to us since 5023 * we don't care anymore. 5024 */ 5025 break; 5026 } 5027 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5028 flags = ch->chunk_flags; 5029 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5030 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5031 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5032 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5033 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5034 if (sizeof(struct sctp_nr_sack_chunk) + 5035 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5036 num_dup * sizeof(uint32_t) != chk_length) { 5037 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5038 break; 5039 } 5040 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5041 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5042 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5043 cum_ack, num_seg, a_rwnd); 5044 stcb->asoc.seen_a_sack_this_pkt = 1; 5045 if ((stcb->asoc.pr_sctp_cnt == 0) && 5046 (num_seg == 0) && (num_nr_seg == 0) && 5047 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5048 (stcb->asoc.saw_sack_with_frags == 0) && 5049 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5050 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5051 /* 5052 * We have a SIMPLE sack having no 5053 * prior segments and data on sent 5054 * queue to be acked. Use the faster 5055 * path sack processing. We also 5056 * allow window update sacks with no 5057 * missing segments to go this way 5058 * too. 5059 */ 5060 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5061 &abort_now, ecne_seen); 5062 } else { 5063 if (netp && *netp) 5064 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5065 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5066 cum_ack, a_rwnd, ecne_seen); 5067 } 5068 if (abort_now) { 5069 /* ABORT signal from sack processing */ 5070 *offset = length; 5071 return (NULL); 5072 } 5073 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5074 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5075 (stcb->asoc.stream_queue_cnt == 0)) { 5076 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5077 } 5078 } 5079 break; 5080 5081 case SCTP_HEARTBEAT_REQUEST: 5082 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5083 if ((stcb) && netp && *netp) { 5084 SCTP_STAT_INCR(sctps_recvheartbeat); 5085 sctp_send_heartbeat_ack(stcb, m, *offset, 5086 chk_length, *netp); 5087 5088 /* He's alive so give him credit */ 5089 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5090 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5091 stcb->asoc.overall_error_count, 5092 0, 5093 SCTP_FROM_SCTP_INPUT, 5094 __LINE__); 5095 } 5096 stcb->asoc.overall_error_count = 0; 5097 } 5098 break; 5099 case SCTP_HEARTBEAT_ACK: 5100 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5101 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5102 /* Its not ours */ 5103 *offset = length; 5104 if (locked_tcb) { 5105 SCTP_TCB_UNLOCK(locked_tcb); 5106 } 5107 return (NULL); 5108 } 5109 /* He's alive so give him credit */ 5110 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5111 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5112 stcb->asoc.overall_error_count, 5113 0, 5114 SCTP_FROM_SCTP_INPUT, 5115 __LINE__); 5116 } 5117 stcb->asoc.overall_error_count = 0; 5118 SCTP_STAT_INCR(sctps_recvheartbeatack); 5119 if (netp && *netp) 5120 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5121 stcb, *netp); 5122 break; 5123 case SCTP_ABORT_ASSOCIATION: 5124 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5125 (void *)stcb); 5126 if ((stcb) && netp && *netp) 5127 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5128 stcb, *netp); 5129 *offset = length; 5130 return (NULL); 5131 break; 5132 case SCTP_SHUTDOWN: 5133 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5134 (void *)stcb); 5135 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5136 *offset = length; 5137 if (locked_tcb) { 5138 SCTP_TCB_UNLOCK(locked_tcb); 5139 } 5140 return (NULL); 5141 } 5142 if (netp && *netp) { 5143 int abort_flag = 0; 5144 5145 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5146 stcb, *netp, &abort_flag); 5147 if (abort_flag) { 5148 *offset = length; 5149 return (NULL); 5150 } 5151 } 5152 break; 5153 case SCTP_SHUTDOWN_ACK: 5154 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5155 if ((stcb) && (netp) && (*netp)) 5156 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5157 *offset = length; 5158 return (NULL); 5159 break; 5160 5161 case SCTP_OPERATION_ERROR: 5162 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5163 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5164 *offset = length; 5165 return (NULL); 5166 } 5167 break; 5168 case SCTP_COOKIE_ECHO: 5169 SCTPDBG(SCTP_DEBUG_INPUT3, 5170 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5171 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5172 ; 5173 } else { 5174 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5175 /* We are not interested anymore */ 5176 abend: 5177 if (stcb) { 5178 SCTP_TCB_UNLOCK(stcb); 5179 } 5180 *offset = length; 5181 return (NULL); 5182 } 5183 } 5184 /* 5185 * First are we accepting? We do this again here 5186 * since it is possible that a previous endpoint WAS 5187 * listening responded to a INIT-ACK and then 5188 * closed. We opened and bound.. and are now no 5189 * longer listening. 5190 */ 5191 5192 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5193 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5194 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5195 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5196 sctp_abort_association(inp, stcb, m, iphlen, 5197 src, dst, sh, op_err, 5198 mflowtype, mflowid, 5199 vrf_id, port); 5200 } 5201 *offset = length; 5202 return (NULL); 5203 } else { 5204 struct mbuf *ret_buf; 5205 struct sctp_inpcb *linp; 5206 5207 if (stcb) { 5208 linp = NULL; 5209 } else { 5210 linp = inp; 5211 } 5212 5213 if (linp) { 5214 SCTP_ASOC_CREATE_LOCK(linp); 5215 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5216 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5217 SCTP_ASOC_CREATE_UNLOCK(linp); 5218 goto abend; 5219 } 5220 } 5221 if (netp) { 5222 ret_buf = 5223 sctp_handle_cookie_echo(m, iphlen, 5224 *offset, 5225 src, dst, 5226 sh, 5227 (struct sctp_cookie_echo_chunk *)ch, 5228 &inp, &stcb, netp, 5229 auth_skipped, 5230 auth_offset, 5231 auth_len, 5232 &locked_tcb, 5233 mflowtype, 5234 mflowid, 5235 vrf_id, 5236 port); 5237 } else { 5238 ret_buf = NULL; 5239 } 5240 if (linp) { 5241 SCTP_ASOC_CREATE_UNLOCK(linp); 5242 } 5243 if (ret_buf == NULL) { 5244 if (locked_tcb) { 5245 SCTP_TCB_UNLOCK(locked_tcb); 5246 } 5247 SCTPDBG(SCTP_DEBUG_INPUT3, 5248 "GAK, null buffer\n"); 5249 *offset = length; 5250 return (NULL); 5251 } 5252 /* if AUTH skipped, see if it verified... */ 5253 if (auth_skipped) { 5254 got_auth = 1; 5255 auth_skipped = 0; 5256 } 5257 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5258 /* 5259 * Restart the timer if we have 5260 * pending data 5261 */ 5262 struct sctp_tmit_chunk *chk; 5263 5264 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5265 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5266 } 5267 } 5268 break; 5269 case SCTP_COOKIE_ACK: 5270 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5271 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5272 if (locked_tcb) { 5273 SCTP_TCB_UNLOCK(locked_tcb); 5274 } 5275 return (NULL); 5276 } 5277 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5278 /* We are not interested anymore */ 5279 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5280 ; 5281 } else if (stcb) { 5282#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5283 so = SCTP_INP_SO(inp); 5284 atomic_add_int(&stcb->asoc.refcnt, 1); 5285 SCTP_TCB_UNLOCK(stcb); 5286 SCTP_SOCKET_LOCK(so, 1); 5287 SCTP_TCB_LOCK(stcb); 5288 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5289#endif 5290 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5291 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5292#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5293 SCTP_SOCKET_UNLOCK(so, 1); 5294#endif 5295 *offset = length; 5296 return (NULL); 5297 } 5298 } 5299 /* He's alive so give him credit */ 5300 if ((stcb) && netp && *netp) { 5301 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5302 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5303 stcb->asoc.overall_error_count, 5304 0, 5305 SCTP_FROM_SCTP_INPUT, 5306 __LINE__); 5307 } 5308 stcb->asoc.overall_error_count = 0; 5309 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5310 } 5311 break; 5312 case SCTP_ECN_ECHO: 5313 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5314 /* He's alive so give him credit */ 5315 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5316 /* Its not ours */ 5317 if (locked_tcb) { 5318 SCTP_TCB_UNLOCK(locked_tcb); 5319 } 5320 *offset = length; 5321 return (NULL); 5322 } 5323 if (stcb) { 5324 if (stcb->asoc.ecn_supported == 0) { 5325 goto unknown_chunk; 5326 } 5327 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5328 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5329 stcb->asoc.overall_error_count, 5330 0, 5331 SCTP_FROM_SCTP_INPUT, 5332 __LINE__); 5333 } 5334 stcb->asoc.overall_error_count = 0; 5335 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5336 stcb); 5337 ecne_seen = 1; 5338 } 5339 break; 5340 case SCTP_ECN_CWR: 5341 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5342 /* He's alive so give him credit */ 5343 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5344 /* Its not ours */ 5345 if (locked_tcb) { 5346 SCTP_TCB_UNLOCK(locked_tcb); 5347 } 5348 *offset = length; 5349 return (NULL); 5350 } 5351 if (stcb) { 5352 if (stcb->asoc.ecn_supported == 0) { 5353 goto unknown_chunk; 5354 } 5355 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5356 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5357 stcb->asoc.overall_error_count, 5358 0, 5359 SCTP_FROM_SCTP_INPUT, 5360 __LINE__); 5361 } 5362 stcb->asoc.overall_error_count = 0; 5363 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5364 } 5365 break; 5366 case SCTP_SHUTDOWN_COMPLETE: 5367 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5368 /* must be first and only chunk */ 5369 if ((num_chunks > 1) || 5370 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5371 *offset = length; 5372 if (locked_tcb) { 5373 SCTP_TCB_UNLOCK(locked_tcb); 5374 } 5375 return (NULL); 5376 } 5377 if ((stcb) && netp && *netp) { 5378 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5379 stcb, *netp); 5380 } 5381 *offset = length; 5382 return (NULL); 5383 break; 5384 case SCTP_ASCONF: 5385 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5386 /* He's alive so give him credit */ 5387 if (stcb) { 5388 if (stcb->asoc.asconf_supported == 0) { 5389 goto unknown_chunk; 5390 } 5391 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5392 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5393 stcb->asoc.overall_error_count, 5394 0, 5395 SCTP_FROM_SCTP_INPUT, 5396 __LINE__); 5397 } 5398 stcb->asoc.overall_error_count = 0; 5399 sctp_handle_asconf(m, *offset, src, 5400 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5401 asconf_cnt++; 5402 } 5403 break; 5404 case SCTP_ASCONF_ACK: 5405 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5406 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5407 /* Its not ours */ 5408 if (locked_tcb) { 5409 SCTP_TCB_UNLOCK(locked_tcb); 5410 } 5411 *offset = length; 5412 return (NULL); 5413 } 5414 if ((stcb) && netp && *netp) { 5415 if (stcb->asoc.asconf_supported == 0) { 5416 goto unknown_chunk; 5417 } 5418 /* He's alive so give him credit */ 5419 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5420 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5421 stcb->asoc.overall_error_count, 5422 0, 5423 SCTP_FROM_SCTP_INPUT, 5424 __LINE__); 5425 } 5426 stcb->asoc.overall_error_count = 0; 5427 sctp_handle_asconf_ack(m, *offset, 5428 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5429 if (abort_no_unlock) 5430 return (NULL); 5431 } 5432 break; 5433 case SCTP_FORWARD_CUM_TSN: 5434 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5435 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5436 /* Its not ours */ 5437 if (locked_tcb) { 5438 SCTP_TCB_UNLOCK(locked_tcb); 5439 } 5440 *offset = length; 5441 return (NULL); 5442 } 5443 /* He's alive so give him credit */ 5444 if (stcb) { 5445 int abort_flag = 0; 5446 5447 if (stcb->asoc.prsctp_supported == 0) { 5448 goto unknown_chunk; 5449 } 5450 stcb->asoc.overall_error_count = 0; 5451 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5452 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5453 stcb->asoc.overall_error_count, 5454 0, 5455 SCTP_FROM_SCTP_INPUT, 5456 __LINE__); 5457 } 5458 *fwd_tsn_seen = 1; 5459 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5460 /* We are not interested anymore */ 5461#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5462 so = SCTP_INP_SO(inp); 5463 atomic_add_int(&stcb->asoc.refcnt, 1); 5464 SCTP_TCB_UNLOCK(stcb); 5465 SCTP_SOCKET_LOCK(so, 1); 5466 SCTP_TCB_LOCK(stcb); 5467 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5468#endif 5469 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5470 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5471#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5472 SCTP_SOCKET_UNLOCK(so, 1); 5473#endif 5474 *offset = length; 5475 return (NULL); 5476 } 5477 sctp_handle_forward_tsn(stcb, 5478 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5479 if (abort_flag) { 5480 *offset = length; 5481 return (NULL); 5482 } else { 5483 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5484 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5485 stcb->asoc.overall_error_count, 5486 0, 5487 SCTP_FROM_SCTP_INPUT, 5488 __LINE__); 5489 } 5490 stcb->asoc.overall_error_count = 0; 5491 } 5492 5493 } 5494 break; 5495 case SCTP_STREAM_RESET: 5496 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5497 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5498 /* Its not ours */ 5499 if (locked_tcb) { 5500 SCTP_TCB_UNLOCK(locked_tcb); 5501 } 5502 *offset = length; 5503 return (NULL); 5504 } 5505 if (stcb->asoc.reconfig_supported == 0) { 5506 goto unknown_chunk; 5507 } 5508 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5509 /* stop processing */ 5510 *offset = length; 5511 return (NULL); 5512 } 5513 break; 5514 case SCTP_PACKET_DROPPED: 5515 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5516 /* re-get it all please */ 5517 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5518 /* Its not ours */ 5519 if (locked_tcb) { 5520 SCTP_TCB_UNLOCK(locked_tcb); 5521 } 5522 *offset = length; 5523 return (NULL); 5524 } 5525 if (ch && (stcb) && netp && (*netp)) { 5526 if (stcb->asoc.pktdrop_supported == 0) { 5527 goto unknown_chunk; 5528 } 5529 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5530 stcb, *netp, 5531 min(chk_length, (sizeof(chunk_buf) - 4))); 5532 5533 } 5534 break; 5535 case SCTP_AUTHENTICATION: 5536 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5537 if (stcb == NULL) { 5538 /* save the first AUTH for later processing */ 5539 if (auth_skipped == 0) { 5540 auth_offset = *offset; 5541 auth_len = chk_length; 5542 auth_skipped = 1; 5543 } 5544 /* skip this chunk (temporarily) */ 5545 goto next_chunk; 5546 } 5547 if (stcb->asoc.auth_supported == 0) { 5548 goto unknown_chunk; 5549 } 5550 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5551 (chk_length > (sizeof(struct sctp_auth_chunk) + 5552 SCTP_AUTH_DIGEST_LEN_MAX))) { 5553 /* Its not ours */ 5554 if (locked_tcb) { 5555 SCTP_TCB_UNLOCK(locked_tcb); 5556 } 5557 *offset = length; 5558 return (NULL); 5559 } 5560 if (got_auth == 1) { 5561 /* skip this chunk... it's already auth'd */ 5562 goto next_chunk; 5563 } 5564 got_auth = 1; 5565 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5566 m, *offset)) { 5567 /* auth HMAC failed so dump the packet */ 5568 *offset = length; 5569 return (stcb); 5570 } else { 5571 /* remaining chunks are HMAC checked */ 5572 stcb->asoc.authenticated = 1; 5573 } 5574 break; 5575 5576 default: 5577 unknown_chunk: 5578 /* it's an unknown chunk! */ 5579 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5580 struct sctp_gen_error_cause *cause; 5581 int len; 5582 5583 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5584 0, M_NOWAIT, 1, MT_DATA); 5585 if (op_err != NULL) { 5586 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5587 cause = mtod(op_err, struct sctp_gen_error_cause *); 5588 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5589 cause->length = htons(len + sizeof(struct sctp_gen_error_cause)); 5590 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5591 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5592 if (SCTP_BUF_NEXT(op_err) != NULL) { 5593#ifdef SCTP_MBUF_LOGGING 5594 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5595 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5596 } 5597#endif 5598 sctp_queue_op_err(stcb, op_err); 5599 } else { 5600 sctp_m_freem(op_err); 5601 } 5602 } 5603 } 5604 if ((ch->chunk_type & 0x80) == 0) { 5605 /* discard this packet */ 5606 *offset = length; 5607 return (stcb); 5608 } /* else skip this bad chunk and continue... */ 5609 break; 5610 } /* switch (ch->chunk_type) */ 5611 5612 5613next_chunk: 5614 /* get the next chunk */ 5615 *offset += SCTP_SIZE32(chk_length); 5616 if (*offset >= length) { 5617 /* no more data left in the mbuf chain */ 5618 break; 5619 } 5620 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5621 sizeof(struct sctp_chunkhdr), chunk_buf); 5622 if (ch == NULL) { 5623 if (locked_tcb) { 5624 SCTP_TCB_UNLOCK(locked_tcb); 5625 } 5626 *offset = length; 5627 return (NULL); 5628 } 5629 } /* while */ 5630 5631 if (asconf_cnt > 0 && stcb != NULL) { 5632 sctp_send_asconf_ack(stcb); 5633 } 5634 return (stcb); 5635} 5636 5637 5638#ifdef INVARIANTS 5639#ifdef __GNUC__ 5640__attribute__((noinline)) 5641#endif 5642 void 5643 sctp_validate_no_locks(struct sctp_inpcb *inp) 5644{ 5645 struct sctp_tcb *lstcb; 5646 5647 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5648 if (mtx_owned(&lstcb->tcb_mtx)) { 5649 panic("Own lock on stcb at return from input"); 5650 } 5651 } 5652 if (mtx_owned(&inp->inp_create_mtx)) { 5653 panic("Own create lock on inp"); 5654 } 5655 if (mtx_owned(&inp->inp_mtx)) { 5656 panic("Own inp lock on inp"); 5657 } 5658} 5659 5660#endif 5661 5662/* 5663 * common input chunk processing (v4 and v6) 5664 */ 5665void 5666sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5667 struct sockaddr *src, struct sockaddr *dst, 5668 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5669#if !defined(SCTP_WITH_NO_CSUM) 5670 uint8_t compute_crc, 5671#endif 5672 uint8_t ecn_bits, 5673 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5674 uint32_t vrf_id, uint16_t port) 5675{ 5676 uint32_t high_tsn; 5677 int fwd_tsn_seen = 0, data_processed = 0; 5678 struct mbuf *m = *mm, *op_err; 5679 char msg[SCTP_DIAG_INFO_LEN]; 5680 int un_sent; 5681 int cnt_ctrl_ready = 0; 5682 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5683 struct sctp_tcb *stcb = NULL; 5684 struct sctp_nets *net = NULL; 5685 5686 SCTP_STAT_INCR(sctps_recvdatagrams); 5687#ifdef SCTP_AUDITING_ENABLED 5688 sctp_audit_log(0xE0, 1); 5689 sctp_auditing(0, inp, stcb, net); 5690#endif 5691#if !defined(SCTP_WITH_NO_CSUM) 5692 if (compute_crc != 0) { 5693 uint32_t check, calc_check; 5694 5695 check = sh->checksum; 5696 sh->checksum = 0; 5697 calc_check = sctp_calculate_cksum(m, iphlen); 5698 sh->checksum = check; 5699 if (calc_check != check) { 5700 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5701 calc_check, check, (void *)m, length, iphlen); 5702 stcb = sctp_findassociation_addr(m, offset, src, dst, 5703 sh, ch, &inp, &net, vrf_id); 5704#if defined(INET) || defined(INET6) 5705 if ((net != NULL) && (port != 0)) { 5706 if (net->port == 0) { 5707 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5708 } 5709 net->port = port; 5710 } 5711#endif 5712 if (net != NULL) { 5713 net->flowtype = mflowtype; 5714 net->flowid = mflowid; 5715 } 5716 if ((inp != NULL) && (stcb != NULL)) { 5717 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5718 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5719 } else if ((inp != NULL) && (stcb == NULL)) { 5720 inp_decr = inp; 5721 } 5722 SCTP_STAT_INCR(sctps_badsum); 5723 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5724 goto out; 5725 } 5726 } 5727#endif 5728 /* Destination port of 0 is illegal, based on RFC4960. */ 5729 if (sh->dest_port == 0) { 5730 SCTP_STAT_INCR(sctps_hdrops); 5731 goto out; 5732 } 5733 stcb = sctp_findassociation_addr(m, offset, src, dst, 5734 sh, ch, &inp, &net, vrf_id); 5735#if defined(INET) || defined(INET6) 5736 if ((net != NULL) && (port != 0)) { 5737 if (net->port == 0) { 5738 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5739 } 5740 net->port = port; 5741 } 5742#endif 5743 if (net != NULL) { 5744 net->flowtype = mflowtype; 5745 net->flowid = mflowid; 5746 } 5747 if (inp == NULL) { 5748 SCTP_STAT_INCR(sctps_noport); 5749 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5750 goto out; 5751 } 5752 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5753 sctp_send_shutdown_complete2(src, dst, sh, 5754 mflowtype, mflowid, fibnum, 5755 vrf_id, port); 5756 goto out; 5757 } 5758 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5759 goto out; 5760 } 5761 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5762 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5763 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5764 (ch->chunk_type != SCTP_INIT))) { 5765 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5766 "Out of the blue"); 5767 sctp_send_abort(m, iphlen, src, dst, 5768 sh, 0, op_err, 5769 mflowtype, mflowid, fibnum, 5770 vrf_id, port); 5771 } 5772 } 5773 goto out; 5774 } else if (stcb == NULL) { 5775 inp_decr = inp; 5776 } 5777#ifdef IPSEC 5778 /*- 5779 * I very much doubt any of the IPSEC stuff will work but I have no 5780 * idea, so I will leave it in place. 5781 */ 5782 if (inp != NULL) { 5783 switch (dst->sa_family) { 5784#ifdef INET 5785 case AF_INET: 5786 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5787 SCTP_STAT_INCR(sctps_hdrops); 5788 goto out; 5789 } 5790 break; 5791#endif 5792#ifdef INET6 5793 case AF_INET6: 5794 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5795 SCTP_STAT_INCR(sctps_hdrops); 5796 goto out; 5797 } 5798 break; 5799#endif 5800 default: 5801 break; 5802 } 5803 } 5804#endif 5805 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5806 (void *)m, iphlen, offset, length, (void *)stcb); 5807 if (stcb) { 5808 /* always clear this before beginning a packet */ 5809 stcb->asoc.authenticated = 0; 5810 stcb->asoc.seen_a_sack_this_pkt = 0; 5811 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5812 (void *)stcb, stcb->asoc.state); 5813 5814 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5815 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5816 /*- 5817 * If we hit here, we had a ref count 5818 * up when the assoc was aborted and the 5819 * timer is clearing out the assoc, we should 5820 * NOT respond to any packet.. its OOTB. 5821 */ 5822 SCTP_TCB_UNLOCK(stcb); 5823 stcb = NULL; 5824 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5825 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5826 msg); 5827 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5828 mflowtype, mflowid, inp->fibnum, 5829 vrf_id, port); 5830 goto out; 5831 } 5832 } 5833 if (IS_SCTP_CONTROL(ch)) { 5834 /* process the control portion of the SCTP packet */ 5835 /* sa_ignore NO_NULL_CHK */ 5836 stcb = sctp_process_control(m, iphlen, &offset, length, 5837 src, dst, sh, ch, 5838 inp, stcb, &net, &fwd_tsn_seen, 5839 mflowtype, mflowid, fibnum, 5840 vrf_id, port); 5841 if (stcb) { 5842 /* 5843 * This covers us if the cookie-echo was there and 5844 * it changes our INP. 5845 */ 5846 inp = stcb->sctp_ep; 5847#if defined(INET) || defined(INET6) 5848 if ((net) && (port)) { 5849 if (net->port == 0) { 5850 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5851 } 5852 net->port = port; 5853 } 5854#endif 5855 } 5856 } else { 5857 /* 5858 * no control chunks, so pre-process DATA chunks (these 5859 * checks are taken care of by control processing) 5860 */ 5861 5862 /* 5863 * if DATA only packet, and auth is required, then punt... 5864 * can't have authenticated without any AUTH (control) 5865 * chunks 5866 */ 5867 if ((stcb != NULL) && 5868 (stcb->asoc.auth_supported == 1) && 5869 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5870 /* "silently" ignore */ 5871 SCTP_STAT_INCR(sctps_recvauthmissing); 5872 goto out; 5873 } 5874 if (stcb == NULL) { 5875 /* out of the blue DATA chunk */ 5876 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5877 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5878 msg); 5879 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5880 mflowtype, mflowid, fibnum, 5881 vrf_id, port); 5882 goto out; 5883 } 5884 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5885 /* v_tag mismatch! */ 5886 SCTP_STAT_INCR(sctps_badvtag); 5887 goto out; 5888 } 5889 } 5890 5891 if (stcb == NULL) { 5892 /* 5893 * no valid TCB for this packet, or we found it's a bad 5894 * packet while processing control, or we're done with this 5895 * packet (done or skip rest of data), so we drop it... 5896 */ 5897 goto out; 5898 } 5899 /* 5900 * DATA chunk processing 5901 */ 5902 /* plow through the data chunks while length > offset */ 5903 5904 /* 5905 * Rest should be DATA only. Check authentication state if AUTH for 5906 * DATA is required. 5907 */ 5908 if ((length > offset) && 5909 (stcb != NULL) && 5910 (stcb->asoc.auth_supported == 1) && 5911 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5912 !stcb->asoc.authenticated) { 5913 /* "silently" ignore */ 5914 SCTP_STAT_INCR(sctps_recvauthmissing); 5915 SCTPDBG(SCTP_DEBUG_AUTH1, 5916 "Data chunk requires AUTH, skipped\n"); 5917 goto trigger_send; 5918 } 5919 if (length > offset) { 5920 int retval; 5921 5922 /* 5923 * First check to make sure our state is correct. We would 5924 * not get here unless we really did have a tag, so we don't 5925 * abort if this happens, just dump the chunk silently. 5926 */ 5927 switch (SCTP_GET_STATE(&stcb->asoc)) { 5928 case SCTP_STATE_COOKIE_ECHOED: 5929 /* 5930 * we consider data with valid tags in this state 5931 * shows us the cookie-ack was lost. Imply it was 5932 * there. 5933 */ 5934 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5935 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5936 stcb->asoc.overall_error_count, 5937 0, 5938 SCTP_FROM_SCTP_INPUT, 5939 __LINE__); 5940 } 5941 stcb->asoc.overall_error_count = 0; 5942 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5943 break; 5944 case SCTP_STATE_COOKIE_WAIT: 5945 /* 5946 * We consider OOTB any data sent during asoc setup. 5947 */ 5948 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5949 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5950 msg); 5951 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5952 mflowtype, mflowid, inp->fibnum, 5953 vrf_id, port); 5954 goto out; 5955 /* sa_ignore NOTREACHED */ 5956 break; 5957 case SCTP_STATE_EMPTY: /* should not happen */ 5958 case SCTP_STATE_INUSE: /* should not happen */ 5959 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5960 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5961 default: 5962 goto out; 5963 /* sa_ignore NOTREACHED */ 5964 break; 5965 case SCTP_STATE_OPEN: 5966 case SCTP_STATE_SHUTDOWN_SENT: 5967 break; 5968 } 5969 /* plow through the data chunks while length > offset */ 5970 retval = sctp_process_data(mm, iphlen, &offset, length, 5971 inp, stcb, net, &high_tsn); 5972 if (retval == 2) { 5973 /* 5974 * The association aborted, NO UNLOCK needed since 5975 * the association is destroyed. 5976 */ 5977 stcb = NULL; 5978 goto out; 5979 } 5980 data_processed = 1; 5981 /* 5982 * Anything important needs to have been m_copy'ed in 5983 * process_data 5984 */ 5985 } 5986 /* take care of ecn */ 5987 if ((data_processed == 1) && 5988 (stcb->asoc.ecn_supported == 1) && 5989 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5990 /* Yep, we need to add a ECNE */ 5991 sctp_send_ecn_echo(stcb, net, high_tsn); 5992 } 5993 if ((data_processed == 0) && (fwd_tsn_seen)) { 5994 int was_a_gap; 5995 uint32_t highest_tsn; 5996 5997 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5998 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5999 } else { 6000 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6001 } 6002 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6003 stcb->asoc.send_sack = 1; 6004 sctp_sack_check(stcb, was_a_gap); 6005 } else if (fwd_tsn_seen) { 6006 stcb->asoc.send_sack = 1; 6007 } 6008 /* trigger send of any chunks in queue... */ 6009trigger_send: 6010#ifdef SCTP_AUDITING_ENABLED 6011 sctp_audit_log(0xE0, 2); 6012 sctp_auditing(1, inp, stcb, net); 6013#endif 6014 SCTPDBG(SCTP_DEBUG_INPUT1, 6015 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6016 stcb->asoc.peers_rwnd, 6017 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6018 stcb->asoc.total_flight); 6019 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6020 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6021 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6022 } 6023 if (cnt_ctrl_ready || 6024 ((un_sent) && 6025 (stcb->asoc.peers_rwnd > 0 || 6026 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6027 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6028 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6029 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6030 } 6031#ifdef SCTP_AUDITING_ENABLED 6032 sctp_audit_log(0xE0, 3); 6033 sctp_auditing(2, inp, stcb, net); 6034#endif 6035out: 6036 if (stcb != NULL) { 6037 SCTP_TCB_UNLOCK(stcb); 6038 } 6039 if (inp_decr != NULL) { 6040 /* reduce ref-count */ 6041 SCTP_INP_WLOCK(inp_decr); 6042 SCTP_INP_DECR_REF(inp_decr); 6043 SCTP_INP_WUNLOCK(inp_decr); 6044 } 6045#ifdef INVARIANTS 6046 if (inp != NULL) { 6047 sctp_validate_no_locks(inp); 6048 } 6049#endif 6050 return; 6051} 6052 6053#ifdef INET 6054void 6055sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6056{ 6057 struct mbuf *m; 6058 int iphlen; 6059 uint32_t vrf_id = 0; 6060 uint8_t ecn_bits; 6061 struct sockaddr_in src, dst; 6062 struct ip *ip; 6063 struct sctphdr *sh; 6064 struct sctp_chunkhdr *ch; 6065 int length, offset; 6066 6067#if !defined(SCTP_WITH_NO_CSUM) 6068 uint8_t compute_crc; 6069 6070#endif 6071 uint32_t mflowid; 6072 uint8_t mflowtype; 6073 uint16_t fibnum; 6074 6075 iphlen = off; 6076 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6077 SCTP_RELEASE_PKT(i_pak); 6078 return; 6079 } 6080 m = SCTP_HEADER_TO_CHAIN(i_pak); 6081#ifdef SCTP_MBUF_LOGGING 6082 /* Log in any input mbufs */ 6083 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6084 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6085 } 6086#endif 6087#ifdef SCTP_PACKET_LOGGING 6088 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6089 sctp_packet_log(m); 6090 } 6091#endif 6092 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6093 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6094 m->m_pkthdr.len, 6095 if_name(m->m_pkthdr.rcvif), 6096 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6097 mflowid = m->m_pkthdr.flowid; 6098 mflowtype = M_HASHTYPE_GET(m); 6099 fibnum = M_GETFIB(m); 6100 SCTP_STAT_INCR(sctps_recvpackets); 6101 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6102 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6103 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6104 if (SCTP_BUF_LEN(m) < offset) { 6105 if ((m = m_pullup(m, offset)) == NULL) { 6106 SCTP_STAT_INCR(sctps_hdrops); 6107 return; 6108 } 6109 } 6110 ip = mtod(m, struct ip *); 6111 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6112 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6113 offset -= sizeof(struct sctp_chunkhdr); 6114 memset(&src, 0, sizeof(struct sockaddr_in)); 6115 src.sin_family = AF_INET; 6116 src.sin_len = sizeof(struct sockaddr_in); 6117 src.sin_port = sh->src_port; 6118 src.sin_addr = ip->ip_src; 6119 memset(&dst, 0, sizeof(struct sockaddr_in)); 6120 dst.sin_family = AF_INET; 6121 dst.sin_len = sizeof(struct sockaddr_in); 6122 dst.sin_port = sh->dest_port; 6123 dst.sin_addr = ip->ip_dst; 6124 length = ntohs(ip->ip_len); 6125 /* Validate mbuf chain length with IP payload length. */ 6126 if (SCTP_HEADER_LEN(m) != length) { 6127 SCTPDBG(SCTP_DEBUG_INPUT1, 6128 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6129 SCTP_STAT_INCR(sctps_hdrops); 6130 goto out; 6131 } 6132 /* SCTP does not allow broadcasts or multicasts */ 6133 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6134 goto out; 6135 } 6136 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6137 goto out; 6138 } 6139 ecn_bits = ip->ip_tos; 6140#if defined(SCTP_WITH_NO_CSUM) 6141 SCTP_STAT_INCR(sctps_recvnocrc); 6142#else 6143 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6144 SCTP_STAT_INCR(sctps_recvhwcrc); 6145 compute_crc = 0; 6146 } else { 6147 SCTP_STAT_INCR(sctps_recvswcrc); 6148 compute_crc = 1; 6149 } 6150#endif 6151 sctp_common_input_processing(&m, iphlen, offset, length, 6152 (struct sockaddr *)&src, 6153 (struct sockaddr *)&dst, 6154 sh, ch, 6155#if !defined(SCTP_WITH_NO_CSUM) 6156 compute_crc, 6157#endif 6158 ecn_bits, 6159 mflowtype, mflowid, fibnum, 6160 vrf_id, port); 6161out: 6162 if (m) { 6163 sctp_m_freem(m); 6164 } 6165 return; 6166} 6167 6168#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6169extern int *sctp_cpuarry; 6170 6171#endif 6172 6173int 6174sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6175{ 6176 struct mbuf *m; 6177 int off; 6178 6179 m = *mp; 6180 off = *offp; 6181#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6182 if (mp_ncpus > 1) { 6183 struct ip *ip; 6184 struct sctphdr *sh; 6185 int offset; 6186 int cpu_to_use; 6187 uint32_t flowid, tag; 6188 6189 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6190 flowid = m->m_pkthdr.flowid; 6191 } else { 6192 /* 6193 * No flow id built by lower layers fix it so we 6194 * create one. 6195 */ 6196 offset = off + sizeof(struct sctphdr); 6197 if (SCTP_BUF_LEN(m) < offset) { 6198 if ((m = m_pullup(m, offset)) == NULL) { 6199 SCTP_STAT_INCR(sctps_hdrops); 6200 return (IPPROTO_DONE); 6201 } 6202 } 6203 ip = mtod(m, struct ip *); 6204 sh = (struct sctphdr *)((caddr_t)ip + off); 6205 tag = htonl(sh->v_tag); 6206 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6207 m->m_pkthdr.flowid = flowid; 6208 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6209 } 6210 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6211 sctp_queue_to_mcore(m, off, cpu_to_use); 6212 return (IPPROTO_DONE); 6213 } 6214#endif 6215 sctp_input_with_port(m, off, 0); 6216 return (IPPROTO_DONE); 6217} 6218 6219#endif 6220