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("$FreeBSD$"); 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 57 static void 58 sctp_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 */ 84 static void 85 sctp_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, struct sctp_nets *net, 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 /* We are only accepting if we have a listening socket. */ 165 if ((stcb == NULL) && 166 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 167 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 168 (!SCTP_IS_LISTENING(inp)))) { 169 /* 170 * FIX ME ?? What about TCP model and we have a 171 * match/restart case? Actually no fix is needed. the lookup 172 * will always find the existing assoc so stcb would not be 173 * NULL. It may be questionable to do this since we COULD 174 * just send back the INIT-ACK and hope that the app did 175 * accept()'s by the time the COOKIE was sent. But there is 176 * a price to pay for COOKIE generation and I don't want to 177 * pay it on the chance that the app will actually do some 178 * accepts(). The App just looses and should NOT be in this 179 * state :-) 180 */ 181 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 182 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 183 "No listener"); 184 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 185 mflowtype, mflowid, inp->fibnum, 186 vrf_id, port); 187 } 188 goto outnow; 189 } 190 if ((stcb != NULL) && 191 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 192 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 193 sctp_send_shutdown_ack(stcb, NULL); 194 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 195 } else { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 197 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 198 src, dst, sh, cp, 199 mflowtype, mflowid, 200 vrf_id, port); 201 } 202 outnow: 203 if (stcb == NULL) { 204 SCTP_INP_RUNLOCK(inp); 205 } 206 } 207 208 /* 209 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 210 */ 211 212 int 213 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 214 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 215 SCTP_UNUSED 216 #endif 217 ) 218 { 219 int unsent_data; 220 unsigned int i; 221 struct sctp_stream_queue_pending *sp; 222 struct sctp_association *asoc; 223 224 /* 225 * This function returns if any stream has true unsent data on it. 226 * Note that as it looks through it will clean up any places that 227 * have old data that has been sent but left at top of stream queue. 228 */ 229 asoc = &stcb->asoc; 230 unsent_data = 0; 231 SCTP_TCB_SEND_LOCK(stcb); 232 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 233 /* Check to see if some data queued */ 234 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 235 /* sa_ignore FREED_MEMORY */ 236 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 237 if (sp == NULL) { 238 continue; 239 } 240 if ((sp->msg_is_complete) && 241 (sp->length == 0) && 242 (sp->sender_all_done)) { 243 /* 244 * We are doing differed cleanup. Last time 245 * through when we took all the data the 246 * sender_all_done was not set. 247 */ 248 if (sp->put_last_out == 0) { 249 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 250 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 251 sp->sender_all_done, 252 sp->length, 253 sp->msg_is_complete, 254 sp->put_last_out); 255 } 256 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 257 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 258 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 259 if (sp->net) { 260 sctp_free_remote_addr(sp->net); 261 sp->net = NULL; 262 } 263 if (sp->data) { 264 sctp_m_freem(sp->data); 265 sp->data = NULL; 266 } 267 sctp_free_a_strmoq(stcb, sp, so_locked); 268 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 269 unsent_data++; 270 } 271 } else { 272 unsent_data++; 273 } 274 if (unsent_data > 0) { 275 break; 276 } 277 } 278 } 279 SCTP_TCB_SEND_UNLOCK(stcb); 280 return (unsent_data); 281 } 282 283 static int 284 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 285 { 286 struct sctp_init *init; 287 struct sctp_association *asoc; 288 struct sctp_nets *lnet; 289 unsigned int i; 290 291 init = &cp->init; 292 asoc = &stcb->asoc; 293 /* save off parameters */ 294 asoc->peer_vtag = ntohl(init->initiate_tag); 295 asoc->peers_rwnd = ntohl(init->a_rwnd); 296 /* init tsn's */ 297 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 298 299 if (!TAILQ_EMPTY(&asoc->nets)) { 300 /* update any ssthresh's that may have a default */ 301 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 302 lnet->ssthresh = asoc->peers_rwnd; 303 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 304 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 305 } 306 } 307 } 308 SCTP_TCB_SEND_LOCK(stcb); 309 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 310 unsigned int newcnt; 311 struct sctp_stream_out *outs; 312 struct sctp_stream_queue_pending *sp, *nsp; 313 struct sctp_tmit_chunk *chk, *nchk; 314 315 /* abandon the upper streams */ 316 newcnt = ntohs(init->num_inbound_streams); 317 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 318 if (chk->rec.data.sid >= newcnt) { 319 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 320 asoc->send_queue_cnt--; 321 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 322 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 323 #ifdef INVARIANTS 324 } else { 325 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 326 #endif 327 } 328 if (chk->data != NULL) { 329 sctp_free_bufspace(stcb, asoc, chk, 1); 330 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 331 0, chk, SCTP_SO_NOT_LOCKED); 332 if (chk->data) { 333 sctp_m_freem(chk->data); 334 chk->data = NULL; 335 } 336 } 337 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 338 /* sa_ignore FREED_MEMORY */ 339 } 340 } 341 if (asoc->strmout) { 342 for (i = newcnt; i < asoc->pre_open_streams; i++) { 343 outs = &asoc->strmout[i]; 344 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 345 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 346 TAILQ_REMOVE(&outs->outqueue, sp, next); 347 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 348 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 349 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 350 if (sp->data) { 351 sctp_m_freem(sp->data); 352 sp->data = NULL; 353 } 354 if (sp->net) { 355 sctp_free_remote_addr(sp->net); 356 sp->net = NULL; 357 } 358 /* Free the chunk */ 359 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 360 /* sa_ignore FREED_MEMORY */ 361 } 362 outs->state = SCTP_STREAM_CLOSED; 363 } 364 } 365 /* cut back the count */ 366 asoc->pre_open_streams = newcnt; 367 } 368 SCTP_TCB_SEND_UNLOCK(stcb); 369 asoc->streamoutcnt = asoc->pre_open_streams; 370 if (asoc->strmout) { 371 for (i = 0; i < asoc->streamoutcnt; i++) { 372 asoc->strmout[i].state = SCTP_STREAM_OPEN; 373 } 374 } 375 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 376 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 377 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 378 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 379 } 380 /* This is the next one we expect */ 381 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 382 383 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 384 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 385 386 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 387 /* open the requested streams */ 388 389 if (asoc->strmin != NULL) { 390 /* Free the old ones */ 391 for (i = 0; i < asoc->streamincnt; i++) { 392 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 393 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 394 } 395 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 396 } 397 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 398 asoc->streamincnt = ntohs(init->num_outbound_streams); 399 } else { 400 asoc->streamincnt = asoc->max_inbound_streams; 401 } 402 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 403 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 404 if (asoc->strmin == NULL) { 405 /* we didn't get memory for the streams! */ 406 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 407 return (-1); 408 } 409 for (i = 0; i < asoc->streamincnt; i++) { 410 asoc->strmin[i].sid = i; 411 asoc->strmin[i].last_mid_delivered = 0xffffffff; 412 TAILQ_INIT(&asoc->strmin[i].inqueue); 413 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 414 asoc->strmin[i].pd_api_started = 0; 415 asoc->strmin[i].delivery_started = 0; 416 } 417 /* 418 * load_address_from_init will put the addresses into the 419 * association when the COOKIE is processed or the INIT-ACK is 420 * processed. Both types of COOKIE's existing and new call this 421 * routine. It will remove addresses that are no longer in the 422 * association (for the restarting case where addresses are 423 * removed). Up front when the INIT arrives we will discard it if it 424 * is a restart and new addresses have been added. 425 */ 426 /* sa_ignore MEMLEAK */ 427 return (0); 428 } 429 430 /* 431 * INIT-ACK message processing/consumption returns value < 0 on error 432 */ 433 static int 434 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 435 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 436 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 437 struct sctp_nets *net, int *abort_no_unlock, 438 uint8_t mflowtype, uint32_t mflowid, 439 uint32_t vrf_id) 440 { 441 struct sctp_association *asoc; 442 struct mbuf *op_err; 443 int retval, abort_flag; 444 uint32_t initack_limit; 445 int nat_friendly = 0; 446 447 /* First verify that we have no illegal param's */ 448 abort_flag = 0; 449 450 op_err = sctp_arethere_unrecognized_parameters(m, 451 (offset + sizeof(struct sctp_init_chunk)), 452 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 453 if (abort_flag) { 454 /* Send an abort and notify peer */ 455 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 456 *abort_no_unlock = 1; 457 return (-1); 458 } 459 asoc = &stcb->asoc; 460 asoc->peer_supports_nat = (uint8_t)nat_friendly; 461 /* process the peer's parameters in the INIT-ACK */ 462 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 463 if (retval < 0) { 464 return (retval); 465 } 466 initack_limit = offset + ntohs(cp->ch.chunk_length); 467 /* load all addresses */ 468 if ((retval = sctp_load_addresses_from_init(stcb, m, 469 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 470 src, dst, NULL, stcb->asoc.port))) { 471 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 472 "Problem with address parameters"); 473 SCTPDBG(SCTP_DEBUG_INPUT1, 474 "Load addresses from INIT causes an abort %d\n", 475 retval); 476 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 477 src, dst, sh, op_err, 478 mflowtype, mflowid, 479 vrf_id, net->port); 480 *abort_no_unlock = 1; 481 return (-1); 482 } 483 /* if the peer doesn't support asconf, flush the asconf queue */ 484 if (asoc->asconf_supported == 0) { 485 struct sctp_asconf_addr *param, *nparam; 486 487 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 488 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 489 SCTP_FREE(param, SCTP_M_ASC_ADDR); 490 } 491 } 492 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 493 stcb->asoc.local_hmacs); 494 if (op_err) { 495 sctp_queue_op_err(stcb, op_err); 496 /* queuing will steal away the mbuf chain to the out queue */ 497 op_err = NULL; 498 } 499 /* extract the cookie and queue it to "echo" it back... */ 500 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 501 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 502 stcb->asoc.overall_error_count, 503 0, 504 SCTP_FROM_SCTP_INPUT, 505 __LINE__); 506 } 507 stcb->asoc.overall_error_count = 0; 508 net->error_count = 0; 509 510 /* 511 * Cancel the INIT timer, We do this first before queueing the 512 * cookie. We always cancel at the primary to assue that we are 513 * canceling the timer started by the INIT which always goes to the 514 * primary. 515 */ 516 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 517 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 518 519 /* calculate the RTO */ 520 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 521 SCTP_RTT_FROM_NON_DATA); 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 uint16_t len; 531 532 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 533 /* We abort with an error of missing mandatory param */ 534 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 535 if (op_err != NULL) { 536 struct sctp_error_missing_param *cause; 537 538 SCTP_BUF_LEN(op_err) = len; 539 cause = mtod(op_err, struct sctp_error_missing_param *); 540 /* Subtract the reserved param */ 541 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 542 cause->cause.length = htons(len); 543 cause->num_missing_params = htonl(1); 544 cause->type[0] = htons(SCTP_STATE_COOKIE); 545 } 546 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 547 src, dst, sh, op_err, 548 mflowtype, mflowid, 549 vrf_id, net->port); 550 *abort_no_unlock = 1; 551 } 552 return (retval); 553 } 554 return (0); 555 } 556 557 static void 558 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 559 struct sctp_tcb *stcb, struct sctp_nets *net) 560 { 561 union sctp_sockstore store; 562 struct sctp_nets *r_net, *f_net; 563 struct timeval tv; 564 int req_prim = 0; 565 uint16_t old_error_counter; 566 567 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 568 /* Invalid length */ 569 return; 570 } 571 memset(&store, 0, sizeof(store)); 572 switch (cp->heartbeat.hb_info.addr_family) { 573 #ifdef INET 574 case AF_INET: 575 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 576 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 577 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 578 store.sin.sin_port = stcb->rport; 579 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 580 sizeof(store.sin.sin_addr)); 581 } else { 582 return; 583 } 584 break; 585 #endif 586 #ifdef INET6 587 case AF_INET6: 588 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 589 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 590 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 591 store.sin6.sin6_port = stcb->rport; 592 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 593 } else { 594 return; 595 } 596 break; 597 #endif 598 default: 599 return; 600 } 601 r_net = sctp_findnet(stcb, &store.sa); 602 if (r_net == NULL) { 603 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 604 return; 605 } 606 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 607 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 608 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 609 /* 610 * If the its a HB and it's random value is correct when can 611 * confirm the destination. 612 */ 613 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 614 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 615 stcb->asoc.primary_destination = r_net; 616 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 617 f_net = TAILQ_FIRST(&stcb->asoc.nets); 618 if (f_net != r_net) { 619 /* 620 * first one on the list is NOT the primary 621 * sctp_cmpaddr() is much more efficient if 622 * the primary is the first on the list, 623 * make it so. 624 */ 625 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 626 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 627 } 628 req_prim = 1; 629 } 630 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 631 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 632 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 633 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 634 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 635 } 636 old_error_counter = r_net->error_count; 637 r_net->error_count = 0; 638 r_net->hb_responded = 1; 639 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 640 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 641 /* Now lets do a RTO with this */ 642 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 643 SCTP_RTT_FROM_NON_DATA); 644 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 645 r_net->dest_state |= SCTP_ADDR_REACHABLE; 646 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 647 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 648 } 649 if (r_net->dest_state & SCTP_ADDR_PF) { 650 r_net->dest_state &= ~SCTP_ADDR_PF; 651 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 652 } 653 if (old_error_counter > 0) { 654 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 655 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 656 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 657 } 658 if (r_net == stcb->asoc.primary_destination) { 659 if (stcb->asoc.alternate) { 660 /* release the alternate, primary is good */ 661 sctp_free_remote_addr(stcb->asoc.alternate); 662 stcb->asoc.alternate = NULL; 663 } 664 } 665 /* Mobility adaptation */ 666 if (req_prim) { 667 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 668 SCTP_MOBILITY_BASE) || 669 sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_FASTHANDOFF)) && 671 sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_PRIM_DELETED)) { 673 674 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 675 stcb->sctp_ep, stcb, NULL, 676 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 677 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_FASTHANDOFF)) { 679 sctp_assoc_immediate_retrans(stcb, 680 stcb->asoc.primary_destination); 681 } 682 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_BASE)) { 684 sctp_move_chunks_from_net(stcb, 685 stcb->asoc.deleted_primary); 686 } 687 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 688 stcb->asoc.deleted_primary); 689 } 690 } 691 } 692 693 static int 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 695 { 696 /* 697 * return 0 means we want you to proceed with the abort non-zero 698 * means no abort processing 699 */ 700 struct sctpasochead *head; 701 702 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) || 703 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 704 atomic_add_int(&stcb->asoc.refcnt, 1); 705 SCTP_TCB_UNLOCK(stcb); 706 SCTP_INP_INFO_WLOCK(); 707 SCTP_TCB_LOCK(stcb); 708 atomic_subtract_int(&stcb->asoc.refcnt, 1); 709 } 710 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 711 /* generate a new vtag and send init */ 712 LIST_REMOVE(stcb, sctp_asocs); 713 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 714 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 715 /* 716 * put it in the bucket in the vtag hash of assoc's for the 717 * system 718 */ 719 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 720 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 721 SCTP_INP_INFO_WUNLOCK(); 722 return (1); 723 } 724 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 725 /* 726 * treat like a case where the cookie expired i.e.: - dump 727 * current cookie. - generate a new vtag. - resend init. 728 */ 729 /* generate a new vtag and send init */ 730 LIST_REMOVE(stcb, sctp_asocs); 731 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 732 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 733 sctp_stop_all_cookie_timers(stcb); 734 sctp_toss_old_cookies(stcb, &stcb->asoc); 735 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 736 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 737 /* 738 * put it in the bucket in the vtag hash of assoc's for the 739 * system 740 */ 741 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 742 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 743 SCTP_INP_INFO_WUNLOCK(); 744 return (1); 745 } 746 return (0); 747 } 748 749 static int 750 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 751 struct sctp_nets *net) 752 { 753 /* 754 * return 0 means we want you to proceed with the abort non-zero 755 * means no abort processing 756 */ 757 if (stcb->asoc.auth_supported == 0) { 758 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 759 return (0); 760 } 761 sctp_asconf_send_nat_state_update(stcb, net); 762 return (1); 763 } 764 765 766 /* Returns 1 if the stcb was aborted, 0 otherwise */ 767 static int 768 sctp_handle_abort(struct sctp_abort_chunk *abort, 769 struct sctp_tcb *stcb, struct sctp_nets *net) 770 { 771 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 772 struct socket *so; 773 #endif 774 uint16_t len; 775 uint16_t error; 776 777 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 778 if (stcb == NULL) 779 return (0); 780 781 len = ntohs(abort->ch.chunk_length); 782 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 783 /* 784 * Need to check the cause codes for our two magic nat 785 * aborts which don't kill the assoc necessarily. 786 */ 787 struct sctp_error_cause *cause; 788 789 cause = (struct sctp_error_cause *)(abort + 1); 790 error = ntohs(cause->code); 791 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 792 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 793 abort->ch.chunk_flags); 794 if (sctp_handle_nat_colliding_state(stcb)) { 795 return (0); 796 } 797 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 798 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 799 abort->ch.chunk_flags); 800 if (sctp_handle_nat_missing_state(stcb, net)) { 801 return (0); 802 } 803 } 804 } else { 805 error = 0; 806 } 807 /* stop any receive timers */ 808 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 809 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 810 /* notify user of the abort and clean up... */ 811 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 812 /* free the tcb */ 813 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 814 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 815 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 816 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 817 } 818 #ifdef SCTP_ASOCLOG_OF_TSNS 819 sctp_print_out_track_log(stcb); 820 #endif 821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 822 so = SCTP_INP_SO(stcb->sctp_ep); 823 atomic_add_int(&stcb->asoc.refcnt, 1); 824 SCTP_TCB_UNLOCK(stcb); 825 SCTP_SOCKET_LOCK(so, 1); 826 SCTP_TCB_LOCK(stcb); 827 atomic_subtract_int(&stcb->asoc.refcnt, 1); 828 #endif 829 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 830 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 831 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 832 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 833 SCTP_SOCKET_UNLOCK(so, 1); 834 #endif 835 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 836 return (1); 837 } 838 839 static void 840 sctp_start_net_timers(struct sctp_tcb *stcb) 841 { 842 uint32_t cnt_hb_sent; 843 struct sctp_nets *net; 844 845 cnt_hb_sent = 0; 846 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 847 /* 848 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 849 * If the dest in unconfirmed send a hb as well if under 850 * max_hb_burst have been sent. 851 */ 852 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 853 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 854 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 855 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 856 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 857 cnt_hb_sent++; 858 } 859 } 860 if (cnt_hb_sent) { 861 sctp_chunk_output(stcb->sctp_ep, stcb, 862 SCTP_OUTPUT_FROM_COOKIE_ACK, 863 SCTP_SO_NOT_LOCKED); 864 } 865 } 866 867 868 static void 869 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 870 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 871 { 872 struct sctp_association *asoc; 873 int some_on_streamwheel; 874 int old_state; 875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 876 struct socket *so; 877 #endif 878 879 SCTPDBG(SCTP_DEBUG_INPUT2, 880 "sctp_handle_shutdown: handling SHUTDOWN\n"); 881 if (stcb == NULL) 882 return; 883 asoc = &stcb->asoc; 884 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 885 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 886 return; 887 } 888 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 889 /* Shutdown NOT the expected size */ 890 return; 891 } 892 old_state = SCTP_GET_STATE(asoc); 893 sctp_update_acked(stcb, cp, abort_flag); 894 if (*abort_flag) { 895 return; 896 } 897 if (asoc->control_pdapi) { 898 /* 899 * With a normal shutdown we assume the end of last record. 900 */ 901 SCTP_INP_READ_LOCK(stcb->sctp_ep); 902 if (asoc->control_pdapi->on_strm_q) { 903 struct sctp_stream_in *strm; 904 905 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 906 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 907 /* Unordered */ 908 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 909 asoc->control_pdapi->on_strm_q = 0; 910 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 911 /* Ordered */ 912 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 913 asoc->control_pdapi->on_strm_q = 0; 914 #ifdef INVARIANTS 915 } else { 916 panic("Unknown state on ctrl:%p on_strm_q:%d", 917 asoc->control_pdapi, 918 asoc->control_pdapi->on_strm_q); 919 #endif 920 } 921 } 922 asoc->control_pdapi->end_added = 1; 923 asoc->control_pdapi->pdapi_aborted = 1; 924 asoc->control_pdapi = NULL; 925 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 926 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 927 so = SCTP_INP_SO(stcb->sctp_ep); 928 atomic_add_int(&stcb->asoc.refcnt, 1); 929 SCTP_TCB_UNLOCK(stcb); 930 SCTP_SOCKET_LOCK(so, 1); 931 SCTP_TCB_LOCK(stcb); 932 atomic_subtract_int(&stcb->asoc.refcnt, 1); 933 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 934 /* assoc was freed while we were unlocked */ 935 SCTP_SOCKET_UNLOCK(so, 1); 936 return; 937 } 938 #endif 939 if (stcb->sctp_socket) { 940 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 941 } 942 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 943 SCTP_SOCKET_UNLOCK(so, 1); 944 #endif 945 } 946 /* goto SHUTDOWN_RECEIVED state to block new requests */ 947 if (stcb->sctp_socket) { 948 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 949 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 950 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 951 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 952 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 953 /* 954 * notify upper layer that peer has initiated a 955 * shutdown 956 */ 957 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 958 959 /* reset time */ 960 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 961 } 962 } 963 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 964 /* 965 * stop the shutdown timer, since we WILL move to 966 * SHUTDOWN-ACK-SENT. 967 */ 968 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 969 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 970 } 971 /* Now is there unsent data on a stream somewhere? */ 972 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 973 974 if (!TAILQ_EMPTY(&asoc->send_queue) || 975 !TAILQ_EMPTY(&asoc->sent_queue) || 976 some_on_streamwheel) { 977 /* By returning we will push more data out */ 978 return; 979 } else { 980 /* no outstanding data to send, so move on... */ 981 /* send SHUTDOWN-ACK */ 982 /* move to SHUTDOWN-ACK-SENT state */ 983 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 984 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 985 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 986 } 987 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 988 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 989 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 990 sctp_stop_timers_for_shutdown(stcb); 991 sctp_send_shutdown_ack(stcb, net); 992 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 993 stcb->sctp_ep, stcb, net); 994 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 995 sctp_send_shutdown_ack(stcb, net); 996 } 997 } 998 } 999 1000 static void 1001 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1002 struct sctp_tcb *stcb, 1003 struct sctp_nets *net) 1004 { 1005 struct sctp_association *asoc; 1006 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1007 struct socket *so; 1008 1009 so = SCTP_INP_SO(stcb->sctp_ep); 1010 #endif 1011 SCTPDBG(SCTP_DEBUG_INPUT2, 1012 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1013 if (stcb == NULL) 1014 return; 1015 1016 asoc = &stcb->asoc; 1017 /* process according to association state */ 1018 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 1019 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1020 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1021 sctp_send_shutdown_complete(stcb, net, 1); 1022 SCTP_TCB_UNLOCK(stcb); 1023 return; 1024 } 1025 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1026 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1027 /* unexpected SHUTDOWN-ACK... so ignore... */ 1028 SCTP_TCB_UNLOCK(stcb); 1029 return; 1030 } 1031 if (asoc->control_pdapi) { 1032 /* 1033 * With a normal shutdown we assume the end of last record. 1034 */ 1035 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1036 asoc->control_pdapi->end_added = 1; 1037 asoc->control_pdapi->pdapi_aborted = 1; 1038 asoc->control_pdapi = NULL; 1039 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1040 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1041 atomic_add_int(&stcb->asoc.refcnt, 1); 1042 SCTP_TCB_UNLOCK(stcb); 1043 SCTP_SOCKET_LOCK(so, 1); 1044 SCTP_TCB_LOCK(stcb); 1045 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1046 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1047 /* assoc was freed while we were unlocked */ 1048 SCTP_SOCKET_UNLOCK(so, 1); 1049 return; 1050 } 1051 #endif 1052 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1053 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1054 SCTP_SOCKET_UNLOCK(so, 1); 1055 #endif 1056 } 1057 #ifdef INVARIANTS 1058 if (!TAILQ_EMPTY(&asoc->send_queue) || 1059 !TAILQ_EMPTY(&asoc->sent_queue) || 1060 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1061 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1062 } 1063 #endif 1064 /* stop the timer */ 1065 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1066 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1067 /* send SHUTDOWN-COMPLETE */ 1068 sctp_send_shutdown_complete(stcb, net, 0); 1069 /* notify upper layer protocol */ 1070 if (stcb->sctp_socket) { 1071 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1072 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1073 stcb->sctp_socket->so_snd.sb_cc = 0; 1074 } 1075 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1076 } 1077 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1078 /* free the TCB but first save off the ep */ 1079 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1080 atomic_add_int(&stcb->asoc.refcnt, 1); 1081 SCTP_TCB_UNLOCK(stcb); 1082 SCTP_SOCKET_LOCK(so, 1); 1083 SCTP_TCB_LOCK(stcb); 1084 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1085 #endif 1086 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1087 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1088 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1089 SCTP_SOCKET_UNLOCK(so, 1); 1090 #endif 1091 } 1092 1093 /* 1094 * Skip past the param header and then we will find the chunk that caused the 1095 * problem. There are two possibilities ASCONF or FWD-TSN other than that and 1096 * our peer must be broken. 1097 */ 1098 static void 1099 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1100 struct sctp_nets *net) 1101 { 1102 struct sctp_chunkhdr *chk; 1103 1104 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1105 switch (chk->chunk_type) { 1106 case SCTP_ASCONF_ACK: 1107 case SCTP_ASCONF: 1108 sctp_asconf_cleanup(stcb, net); 1109 break; 1110 case SCTP_IFORWARD_CUM_TSN: 1111 case SCTP_FORWARD_CUM_TSN: 1112 stcb->asoc.prsctp_supported = 0; 1113 break; 1114 default: 1115 SCTPDBG(SCTP_DEBUG_INPUT2, 1116 "Peer does not support chunk type %d(%x)??\n", 1117 chk->chunk_type, (uint32_t)chk->chunk_type); 1118 break; 1119 } 1120 } 1121 1122 /* 1123 * Skip past the param header and then we will find the param that caused the 1124 * problem. There are a number of param's in a ASCONF OR the prsctp param 1125 * these will turn of specific features. 1126 * XXX: Is this the right thing to do? 1127 */ 1128 static void 1129 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1130 { 1131 struct sctp_paramhdr *pbad; 1132 1133 pbad = phdr + 1; 1134 switch (ntohs(pbad->param_type)) { 1135 /* pr-sctp draft */ 1136 case SCTP_PRSCTP_SUPPORTED: 1137 stcb->asoc.prsctp_supported = 0; 1138 break; 1139 case SCTP_SUPPORTED_CHUNK_EXT: 1140 break; 1141 /* draft-ietf-tsvwg-addip-sctp */ 1142 case SCTP_HAS_NAT_SUPPORT: 1143 stcb->asoc.peer_supports_nat = 0; 1144 break; 1145 case SCTP_ADD_IP_ADDRESS: 1146 case SCTP_DEL_IP_ADDRESS: 1147 case SCTP_SET_PRIM_ADDR: 1148 stcb->asoc.asconf_supported = 0; 1149 break; 1150 case SCTP_SUCCESS_REPORT: 1151 case SCTP_ERROR_CAUSE_IND: 1152 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1153 SCTPDBG(SCTP_DEBUG_INPUT2, 1154 "Turning off ASCONF to this strange peer\n"); 1155 stcb->asoc.asconf_supported = 0; 1156 break; 1157 default: 1158 SCTPDBG(SCTP_DEBUG_INPUT2, 1159 "Peer does not support param type %d(%x)??\n", 1160 pbad->param_type, (uint32_t)pbad->param_type); 1161 break; 1162 } 1163 } 1164 1165 static int 1166 sctp_handle_error(struct sctp_chunkhdr *ch, 1167 struct sctp_tcb *stcb, struct sctp_nets *net) 1168 { 1169 int chklen; 1170 struct sctp_paramhdr *phdr; 1171 uint16_t error, error_type; 1172 uint16_t error_len; 1173 struct sctp_association *asoc; 1174 int adjust; 1175 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1176 struct socket *so; 1177 #endif 1178 1179 /* parse through all of the errors and process */ 1180 asoc = &stcb->asoc; 1181 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1182 sizeof(struct sctp_chunkhdr)); 1183 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1184 error = 0; 1185 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1186 /* Process an Error Cause */ 1187 error_type = ntohs(phdr->param_type); 1188 error_len = ntohs(phdr->param_length); 1189 if ((error_len > chklen) || (error_len == 0)) { 1190 /* invalid param length for this param */ 1191 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1192 chklen, error_len); 1193 return (0); 1194 } 1195 if (error == 0) { 1196 /* report the first error cause */ 1197 error = error_type; 1198 } 1199 switch (error_type) { 1200 case SCTP_CAUSE_INVALID_STREAM: 1201 case SCTP_CAUSE_MISSING_PARAM: 1202 case SCTP_CAUSE_INVALID_PARAM: 1203 case SCTP_CAUSE_NO_USER_DATA: 1204 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1205 error_type); 1206 break; 1207 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1208 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1209 ch->chunk_flags); 1210 if (sctp_handle_nat_colliding_state(stcb)) { 1211 return (0); 1212 } 1213 break; 1214 case SCTP_CAUSE_NAT_MISSING_STATE: 1215 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1216 ch->chunk_flags); 1217 if (sctp_handle_nat_missing_state(stcb, net)) { 1218 return (0); 1219 } 1220 break; 1221 case SCTP_CAUSE_STALE_COOKIE: 1222 /* 1223 * We only act if we have echoed a cookie and are 1224 * waiting. 1225 */ 1226 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1227 int *p; 1228 1229 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1230 /* Save the time doubled */ 1231 asoc->cookie_preserve_req = ntohl(*p) << 1; 1232 asoc->stale_cookie_count++; 1233 if (asoc->stale_cookie_count > 1234 asoc->max_init_times) { 1235 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1236 /* now free the asoc */ 1237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1238 so = SCTP_INP_SO(stcb->sctp_ep); 1239 atomic_add_int(&stcb->asoc.refcnt, 1); 1240 SCTP_TCB_UNLOCK(stcb); 1241 SCTP_SOCKET_LOCK(so, 1); 1242 SCTP_TCB_LOCK(stcb); 1243 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1244 #endif 1245 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1246 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1247 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1248 SCTP_SOCKET_UNLOCK(so, 1); 1249 #endif 1250 return (-1); 1251 } 1252 /* blast back to INIT state */ 1253 sctp_toss_old_cookies(stcb, &stcb->asoc); 1254 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1255 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1256 sctp_stop_all_cookie_timers(stcb); 1257 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1258 } 1259 break; 1260 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1261 /* 1262 * Nothing we can do here, we don't do hostname 1263 * addresses so if the peer does not like my IPv6 1264 * (or IPv4 for that matter) it does not matter. If 1265 * they don't support that type of address, they can 1266 * NOT possibly get that packet type... i.e. with no 1267 * IPv6 you can't receive a IPv6 packet. so we can 1268 * safely ignore this one. If we ever added support 1269 * for HOSTNAME Addresses, then we would need to do 1270 * something here. 1271 */ 1272 break; 1273 case SCTP_CAUSE_UNRECOG_CHUNK: 1274 sctp_process_unrecog_chunk(stcb, phdr, net); 1275 break; 1276 case SCTP_CAUSE_UNRECOG_PARAM: 1277 sctp_process_unrecog_param(stcb, phdr); 1278 break; 1279 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1280 /* 1281 * We ignore this since the timer will drive out a 1282 * new cookie anyway and there timer will drive us 1283 * to send a SHUTDOWN_COMPLETE. We can't send one 1284 * here since we don't have their tag. 1285 */ 1286 break; 1287 case SCTP_CAUSE_DELETING_LAST_ADDR: 1288 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1289 case SCTP_CAUSE_DELETING_SRC_ADDR: 1290 /* 1291 * We should NOT get these here, but in a 1292 * ASCONF-ACK. 1293 */ 1294 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1295 error_type); 1296 break; 1297 case SCTP_CAUSE_OUT_OF_RESC: 1298 /* 1299 * And what, pray tell do we do with the fact that 1300 * the peer is out of resources? Not really sure we 1301 * could do anything but abort. I suspect this 1302 * should have came WITH an abort instead of in a 1303 * OP-ERROR. 1304 */ 1305 break; 1306 default: 1307 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1308 error_type); 1309 break; 1310 } 1311 adjust = SCTP_SIZE32(error_len); 1312 chklen -= adjust; 1313 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1314 } 1315 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1316 return (0); 1317 } 1318 1319 static int 1320 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1321 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1322 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1323 struct sctp_nets *net, int *abort_no_unlock, 1324 uint8_t mflowtype, uint32_t mflowid, 1325 uint32_t vrf_id) 1326 { 1327 struct sctp_init_ack *init_ack; 1328 struct mbuf *op_err; 1329 1330 SCTPDBG(SCTP_DEBUG_INPUT2, 1331 "sctp_handle_init_ack: handling INIT-ACK\n"); 1332 1333 if (stcb == NULL) { 1334 SCTPDBG(SCTP_DEBUG_INPUT2, 1335 "sctp_handle_init_ack: TCB is null\n"); 1336 return (-1); 1337 } 1338 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1339 /* Invalid length */ 1340 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1341 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1342 src, dst, sh, op_err, 1343 mflowtype, mflowid, 1344 vrf_id, net->port); 1345 *abort_no_unlock = 1; 1346 return (-1); 1347 } 1348 init_ack = &cp->init; 1349 /* validate parameters */ 1350 if (init_ack->initiate_tag == 0) { 1351 /* protocol error... send an abort */ 1352 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1353 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1354 src, dst, sh, op_err, 1355 mflowtype, mflowid, 1356 vrf_id, net->port); 1357 *abort_no_unlock = 1; 1358 return (-1); 1359 } 1360 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1361 /* protocol error... send an abort */ 1362 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1363 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1364 src, dst, sh, op_err, 1365 mflowtype, mflowid, 1366 vrf_id, net->port); 1367 *abort_no_unlock = 1; 1368 return (-1); 1369 } 1370 if (init_ack->num_inbound_streams == 0) { 1371 /* protocol error... send an abort */ 1372 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1373 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1374 src, dst, sh, op_err, 1375 mflowtype, mflowid, 1376 vrf_id, net->port); 1377 *abort_no_unlock = 1; 1378 return (-1); 1379 } 1380 if (init_ack->num_outbound_streams == 0) { 1381 /* protocol error... send an abort */ 1382 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1383 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1384 src, dst, sh, op_err, 1385 mflowtype, mflowid, 1386 vrf_id, net->port); 1387 *abort_no_unlock = 1; 1388 return (-1); 1389 } 1390 /* process according to association state... */ 1391 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1392 case SCTP_STATE_COOKIE_WAIT: 1393 /* this is the expected state for this chunk */ 1394 /* process the INIT-ACK parameters */ 1395 if (stcb->asoc.primary_destination->dest_state & 1396 SCTP_ADDR_UNCONFIRMED) { 1397 /* 1398 * The primary is where we sent the INIT, we can 1399 * always consider it confirmed when the INIT-ACK is 1400 * returned. Do this before we load addresses 1401 * though. 1402 */ 1403 stcb->asoc.primary_destination->dest_state &= 1404 ~SCTP_ADDR_UNCONFIRMED; 1405 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1406 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1407 } 1408 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1409 net, abort_no_unlock, 1410 mflowtype, mflowid, 1411 vrf_id) < 0) { 1412 /* error in parsing parameters */ 1413 return (-1); 1414 } 1415 /* update our state */ 1416 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1417 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1418 1419 /* reset the RTO calc */ 1420 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1421 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1422 stcb->asoc.overall_error_count, 1423 0, 1424 SCTP_FROM_SCTP_INPUT, 1425 __LINE__); 1426 } 1427 stcb->asoc.overall_error_count = 0; 1428 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1429 /* 1430 * collapse the init timer back in case of a exponential 1431 * backoff 1432 */ 1433 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1434 stcb, net); 1435 /* 1436 * the send at the end of the inbound data processing will 1437 * cause the cookie to be sent 1438 */ 1439 break; 1440 case SCTP_STATE_SHUTDOWN_SENT: 1441 /* incorrect state... discard */ 1442 break; 1443 case SCTP_STATE_COOKIE_ECHOED: 1444 /* incorrect state... discard */ 1445 break; 1446 case SCTP_STATE_OPEN: 1447 /* incorrect state... discard */ 1448 break; 1449 case SCTP_STATE_EMPTY: 1450 case SCTP_STATE_INUSE: 1451 default: 1452 /* incorrect state... discard */ 1453 return (-1); 1454 break; 1455 } 1456 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1457 return (0); 1458 } 1459 1460 static struct sctp_tcb * 1461 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1462 struct sockaddr *src, struct sockaddr *dst, 1463 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1464 struct sctp_inpcb *inp, struct sctp_nets **netp, 1465 struct sockaddr *init_src, int *notification, 1466 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1467 uint8_t mflowtype, uint32_t mflowid, 1468 uint32_t vrf_id, uint16_t port); 1469 1470 1471 /* 1472 * handle a state cookie for an existing association m: input packet mbuf 1473 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1474 * "split" mbuf and the cookie signature does not exist offset: offset into 1475 * mbuf to the cookie-echo chunk 1476 */ 1477 static struct sctp_tcb * 1478 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1479 struct sockaddr *src, struct sockaddr *dst, 1480 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1481 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1482 struct sockaddr *init_src, int *notification, 1483 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1484 uint8_t mflowtype, uint32_t mflowid, 1485 uint32_t vrf_id, uint16_t port) 1486 { 1487 struct sctp_association *asoc; 1488 struct sctp_init_chunk *init_cp, init_buf; 1489 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1490 struct sctp_nets *net; 1491 struct mbuf *op_err; 1492 struct timeval old; 1493 int init_offset, initack_offset, i; 1494 int retval; 1495 int spec_flag = 0; 1496 uint32_t how_indx; 1497 #if defined(SCTP_DETAILED_STR_STATS) 1498 int j; 1499 #endif 1500 1501 net = *netp; 1502 /* I know that the TCB is non-NULL from the caller */ 1503 asoc = &stcb->asoc; 1504 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1505 if (asoc->cookie_how[how_indx] == 0) 1506 break; 1507 } 1508 if (how_indx < sizeof(asoc->cookie_how)) { 1509 asoc->cookie_how[how_indx] = 1; 1510 } 1511 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1512 /* SHUTDOWN came in after sending INIT-ACK */ 1513 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1514 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1515 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1516 mflowtype, mflowid, inp->fibnum, 1517 vrf_id, net->port); 1518 if (how_indx < sizeof(asoc->cookie_how)) 1519 asoc->cookie_how[how_indx] = 2; 1520 return (NULL); 1521 } 1522 /* 1523 * find and validate the INIT chunk in the cookie (peer's info) the 1524 * INIT should start after the cookie-echo header struct (chunk 1525 * header, state cookie header struct) 1526 */ 1527 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1528 1529 init_cp = (struct sctp_init_chunk *) 1530 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1531 (uint8_t *)&init_buf); 1532 if (init_cp == NULL) { 1533 /* could not pull a INIT chunk in cookie */ 1534 return (NULL); 1535 } 1536 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1537 return (NULL); 1538 } 1539 /* 1540 * find and validate the INIT-ACK chunk in the cookie (my info) the 1541 * INIT-ACK follows the INIT chunk 1542 */ 1543 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1544 initack_cp = (struct sctp_init_ack_chunk *) 1545 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1546 (uint8_t *)&initack_buf); 1547 if (initack_cp == NULL) { 1548 /* could not pull INIT-ACK chunk in cookie */ 1549 return (NULL); 1550 } 1551 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1552 return (NULL); 1553 } 1554 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1555 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1556 /* 1557 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1558 * to get into the OPEN state 1559 */ 1560 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1561 /*- 1562 * Opps, this means that we somehow generated two vtag's 1563 * the same. I.e. we did: 1564 * Us Peer 1565 * <---INIT(tag=a)------ 1566 * ----INIT-ACK(tag=t)--> 1567 * ----INIT(tag=t)------> *1 1568 * <---INIT-ACK(tag=a)--- 1569 * <----CE(tag=t)------------- *2 1570 * 1571 * At point *1 we should be generating a different 1572 * tag t'. Which means we would throw away the CE and send 1573 * ours instead. Basically this is case C (throw away side). 1574 */ 1575 if (how_indx < sizeof(asoc->cookie_how)) 1576 asoc->cookie_how[how_indx] = 17; 1577 return (NULL); 1578 1579 } 1580 switch (SCTP_GET_STATE(asoc)) { 1581 case SCTP_STATE_COOKIE_WAIT: 1582 case SCTP_STATE_COOKIE_ECHOED: 1583 /* 1584 * INIT was sent but got a COOKIE_ECHO with the 1585 * correct tags... just accept it...but we must 1586 * process the init so that we can make sure we have 1587 * the right seq no's. 1588 */ 1589 /* First we must process the INIT !! */ 1590 retval = sctp_process_init(init_cp, stcb); 1591 if (retval < 0) { 1592 if (how_indx < sizeof(asoc->cookie_how)) 1593 asoc->cookie_how[how_indx] = 3; 1594 return (NULL); 1595 } 1596 /* we have already processed the INIT so no problem */ 1597 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1598 stcb, net, 1599 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1600 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1601 stcb, net, 1602 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1603 /* update current state */ 1604 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1605 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1606 else 1607 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1608 1609 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1610 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1611 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1612 stcb->sctp_ep, stcb, asoc->primary_destination); 1613 } 1614 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1615 sctp_stop_all_cookie_timers(stcb); 1616 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1617 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1618 (!SCTP_IS_LISTENING(inp))) { 1619 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1620 struct socket *so; 1621 #endif 1622 /* 1623 * Here is where collision would go if we 1624 * did a connect() and instead got a 1625 * init/init-ack/cookie done before the 1626 * init-ack came back.. 1627 */ 1628 stcb->sctp_ep->sctp_flags |= 1629 SCTP_PCB_FLAGS_CONNECTED; 1630 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1631 so = SCTP_INP_SO(stcb->sctp_ep); 1632 atomic_add_int(&stcb->asoc.refcnt, 1); 1633 SCTP_TCB_UNLOCK(stcb); 1634 SCTP_SOCKET_LOCK(so, 1); 1635 SCTP_TCB_LOCK(stcb); 1636 atomic_add_int(&stcb->asoc.refcnt, -1); 1637 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1638 SCTP_SOCKET_UNLOCK(so, 1); 1639 return (NULL); 1640 } 1641 #endif 1642 soisconnected(stcb->sctp_socket); 1643 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1644 SCTP_SOCKET_UNLOCK(so, 1); 1645 #endif 1646 } 1647 /* notify upper layer */ 1648 *notification = SCTP_NOTIFY_ASSOC_UP; 1649 /* 1650 * since we did not send a HB make sure we don't 1651 * double things 1652 */ 1653 old.tv_sec = cookie->time_entered.tv_sec; 1654 old.tv_usec = cookie->time_entered.tv_usec; 1655 net->hb_responded = 1; 1656 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1657 &old, 1658 SCTP_RTT_FROM_NON_DATA); 1659 1660 if (stcb->asoc.sctp_autoclose_ticks && 1661 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1662 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1663 inp, stcb, NULL); 1664 } 1665 break; 1666 default: 1667 /* 1668 * we're in the OPEN state (or beyond), so peer must 1669 * have simply lost the COOKIE-ACK 1670 */ 1671 break; 1672 } /* end switch */ 1673 sctp_stop_all_cookie_timers(stcb); 1674 /* 1675 * We ignore the return code here.. not sure if we should 1676 * somehow abort.. but we do have an existing asoc. This 1677 * really should not fail. 1678 */ 1679 if (sctp_load_addresses_from_init(stcb, m, 1680 init_offset + sizeof(struct sctp_init_chunk), 1681 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1682 if (how_indx < sizeof(asoc->cookie_how)) 1683 asoc->cookie_how[how_indx] = 4; 1684 return (NULL); 1685 } 1686 /* respond with a COOKIE-ACK */ 1687 sctp_toss_old_cookies(stcb, asoc); 1688 sctp_send_cookie_ack(stcb); 1689 if (how_indx < sizeof(asoc->cookie_how)) 1690 asoc->cookie_how[how_indx] = 5; 1691 return (stcb); 1692 } 1693 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1694 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1695 cookie->tie_tag_my_vtag == 0 && 1696 cookie->tie_tag_peer_vtag == 0) { 1697 /* 1698 * case C in Section 5.2.4 Table 2: XMOO silently discard 1699 */ 1700 if (how_indx < sizeof(asoc->cookie_how)) 1701 asoc->cookie_how[how_indx] = 6; 1702 return (NULL); 1703 } 1704 /* 1705 * If nat support, and the below and stcb is established, send back 1706 * a ABORT(colliding state) if we are established. 1707 */ 1708 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1709 (asoc->peer_supports_nat) && 1710 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1711 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1712 (asoc->peer_vtag == 0)))) { 1713 /* 1714 * Special case - Peer's support nat. We may have two init's 1715 * that we gave out the same tag on since one was not 1716 * established.. i.e. we get INIT from host-1 behind the nat 1717 * and we respond tag-a, we get a INIT from host-2 behind 1718 * the nat and we get tag-a again. Then we bring up host-1 1719 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1720 * Now we have colliding state. We must send an abort here 1721 * with colliding state indication. 1722 */ 1723 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1724 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1725 mflowtype, mflowid, inp->fibnum, 1726 vrf_id, port); 1727 return (NULL); 1728 } 1729 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1730 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1731 (asoc->peer_vtag == 0))) { 1732 /* 1733 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1734 * should be ok, re-accept peer info 1735 */ 1736 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1737 /* 1738 * Extension of case C. If we hit this, then the 1739 * random number generator returned the same vtag 1740 * when we first sent our INIT-ACK and when we later 1741 * sent our INIT. The side with the seq numbers that 1742 * are different will be the one that normnally 1743 * would have hit case C. This in effect "extends" 1744 * our vtags in this collision case to be 64 bits. 1745 * The same collision could occur aka you get both 1746 * vtag and seq number the same twice in a row.. but 1747 * is much less likely. If it did happen then we 1748 * would proceed through and bring up the assoc.. we 1749 * may end up with the wrong stream setup however.. 1750 * which would be bad.. but there is no way to 1751 * tell.. until we send on a stream that does not 1752 * exist :-) 1753 */ 1754 if (how_indx < sizeof(asoc->cookie_how)) 1755 asoc->cookie_how[how_indx] = 7; 1756 1757 return (NULL); 1758 } 1759 if (how_indx < sizeof(asoc->cookie_how)) 1760 asoc->cookie_how[how_indx] = 8; 1761 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1762 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1763 sctp_stop_all_cookie_timers(stcb); 1764 /* 1765 * since we did not send a HB make sure we don't double 1766 * things 1767 */ 1768 net->hb_responded = 1; 1769 if (stcb->asoc.sctp_autoclose_ticks && 1770 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1771 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1772 NULL); 1773 } 1774 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1775 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1776 1777 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1778 /* 1779 * Ok the peer probably discarded our data (if we 1780 * echoed a cookie+data). So anything on the 1781 * sent_queue should be marked for retransmit, we 1782 * may not get something to kick us so it COULD 1783 * still take a timeout to move these.. but it can't 1784 * hurt to mark them. 1785 */ 1786 struct sctp_tmit_chunk *chk; 1787 1788 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1789 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1790 chk->sent = SCTP_DATAGRAM_RESEND; 1791 sctp_flight_size_decrease(chk); 1792 sctp_total_flight_decrease(stcb, chk); 1793 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1794 spec_flag++; 1795 } 1796 } 1797 1798 } 1799 /* process the INIT info (peer's info) */ 1800 retval = sctp_process_init(init_cp, stcb); 1801 if (retval < 0) { 1802 if (how_indx < sizeof(asoc->cookie_how)) 1803 asoc->cookie_how[how_indx] = 9; 1804 return (NULL); 1805 } 1806 if (sctp_load_addresses_from_init(stcb, m, 1807 init_offset + sizeof(struct sctp_init_chunk), 1808 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1809 if (how_indx < sizeof(asoc->cookie_how)) 1810 asoc->cookie_how[how_indx] = 10; 1811 return (NULL); 1812 } 1813 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1814 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1815 *notification = SCTP_NOTIFY_ASSOC_UP; 1816 1817 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1818 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1819 (!SCTP_IS_LISTENING(inp))) { 1820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1821 struct socket *so; 1822 #endif 1823 stcb->sctp_ep->sctp_flags |= 1824 SCTP_PCB_FLAGS_CONNECTED; 1825 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1826 so = SCTP_INP_SO(stcb->sctp_ep); 1827 atomic_add_int(&stcb->asoc.refcnt, 1); 1828 SCTP_TCB_UNLOCK(stcb); 1829 SCTP_SOCKET_LOCK(so, 1); 1830 SCTP_TCB_LOCK(stcb); 1831 atomic_add_int(&stcb->asoc.refcnt, -1); 1832 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1833 SCTP_SOCKET_UNLOCK(so, 1); 1834 return (NULL); 1835 } 1836 #endif 1837 soisconnected(stcb->sctp_socket); 1838 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1839 SCTP_SOCKET_UNLOCK(so, 1); 1840 #endif 1841 } 1842 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1843 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1844 else 1845 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1846 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1847 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1848 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1849 } else { 1850 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1851 } 1852 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1853 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1854 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1855 stcb->sctp_ep, stcb, asoc->primary_destination); 1856 } 1857 sctp_stop_all_cookie_timers(stcb); 1858 sctp_toss_old_cookies(stcb, asoc); 1859 sctp_send_cookie_ack(stcb); 1860 if (spec_flag) { 1861 /* 1862 * only if we have retrans set do we do this. What 1863 * this call does is get only the COOKIE-ACK out and 1864 * then when we return the normal call to 1865 * sctp_chunk_output will get the retrans out behind 1866 * this. 1867 */ 1868 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1869 } 1870 if (how_indx < sizeof(asoc->cookie_how)) 1871 asoc->cookie_how[how_indx] = 11; 1872 1873 return (stcb); 1874 } 1875 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1876 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1877 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1878 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1879 cookie->tie_tag_peer_vtag != 0) { 1880 struct sctpasochead *head; 1881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1882 struct socket *so; 1883 #endif 1884 1885 if (asoc->peer_supports_nat) { 1886 /* 1887 * This is a gross gross hack. Just call the 1888 * cookie_new code since we are allowing a duplicate 1889 * association. I hope this works... 1890 */ 1891 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1892 sh, cookie, cookie_len, 1893 inp, netp, init_src, notification, 1894 auth_skipped, auth_offset, auth_len, 1895 mflowtype, mflowid, 1896 vrf_id, port)); 1897 } 1898 /* 1899 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1900 */ 1901 /* temp code */ 1902 if (how_indx < sizeof(asoc->cookie_how)) 1903 asoc->cookie_how[how_indx] = 12; 1904 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1905 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1906 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1907 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1908 1909 /* notify upper layer */ 1910 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1911 atomic_add_int(&stcb->asoc.refcnt, 1); 1912 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1913 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1914 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1915 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1916 } 1917 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1918 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1919 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1920 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1921 } 1922 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1923 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1924 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1925 stcb->sctp_ep, stcb, asoc->primary_destination); 1926 1927 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1928 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1929 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1930 } 1931 asoc->pre_open_streams = 1932 ntohs(initack_cp->init.num_outbound_streams); 1933 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1934 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1935 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1936 1937 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1938 1939 asoc->str_reset_seq_in = asoc->init_seq_number; 1940 1941 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1942 if (asoc->mapping_array) { 1943 memset(asoc->mapping_array, 0, 1944 asoc->mapping_array_size); 1945 } 1946 if (asoc->nr_mapping_array) { 1947 memset(asoc->nr_mapping_array, 0, 1948 asoc->mapping_array_size); 1949 } 1950 SCTP_TCB_UNLOCK(stcb); 1951 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1952 so = SCTP_INP_SO(stcb->sctp_ep); 1953 SCTP_SOCKET_LOCK(so, 1); 1954 #endif 1955 SCTP_INP_INFO_WLOCK(); 1956 SCTP_INP_WLOCK(stcb->sctp_ep); 1957 SCTP_TCB_LOCK(stcb); 1958 atomic_add_int(&stcb->asoc.refcnt, -1); 1959 /* send up all the data */ 1960 SCTP_TCB_SEND_LOCK(stcb); 1961 1962 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1963 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1964 stcb->asoc.strmout[i].chunks_on_queues = 0; 1965 #if defined(SCTP_DETAILED_STR_STATS) 1966 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1967 asoc->strmout[i].abandoned_sent[j] = 0; 1968 asoc->strmout[i].abandoned_unsent[j] = 0; 1969 } 1970 #else 1971 asoc->strmout[i].abandoned_sent[0] = 0; 1972 asoc->strmout[i].abandoned_unsent[0] = 0; 1973 #endif 1974 stcb->asoc.strmout[i].sid = i; 1975 stcb->asoc.strmout[i].next_mid_ordered = 0; 1976 stcb->asoc.strmout[i].next_mid_unordered = 0; 1977 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1978 } 1979 /* process the INIT-ACK info (my info) */ 1980 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1981 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1982 1983 /* pull from vtag hash */ 1984 LIST_REMOVE(stcb, sctp_asocs); 1985 /* re-insert to new vtag position */ 1986 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1987 SCTP_BASE_INFO(hashasocmark))]; 1988 /* 1989 * put it in the bucket in the vtag hash of assoc's for the 1990 * system 1991 */ 1992 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1993 1994 SCTP_TCB_SEND_UNLOCK(stcb); 1995 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1996 SCTP_INP_INFO_WUNLOCK(); 1997 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1998 SCTP_SOCKET_UNLOCK(so, 1); 1999 #endif 2000 asoc->total_flight = 0; 2001 asoc->total_flight_count = 0; 2002 /* process the INIT info (peer's info) */ 2003 retval = sctp_process_init(init_cp, stcb); 2004 if (retval < 0) { 2005 if (how_indx < sizeof(asoc->cookie_how)) 2006 asoc->cookie_how[how_indx] = 13; 2007 2008 return (NULL); 2009 } 2010 /* 2011 * since we did not send a HB make sure we don't double 2012 * things 2013 */ 2014 net->hb_responded = 1; 2015 2016 if (sctp_load_addresses_from_init(stcb, m, 2017 init_offset + sizeof(struct sctp_init_chunk), 2018 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2019 if (how_indx < sizeof(asoc->cookie_how)) 2020 asoc->cookie_how[how_indx] = 14; 2021 2022 return (NULL); 2023 } 2024 /* respond with a COOKIE-ACK */ 2025 sctp_stop_all_cookie_timers(stcb); 2026 sctp_toss_old_cookies(stcb, asoc); 2027 sctp_send_cookie_ack(stcb); 2028 if (how_indx < sizeof(asoc->cookie_how)) 2029 asoc->cookie_how[how_indx] = 15; 2030 2031 return (stcb); 2032 } 2033 if (how_indx < sizeof(asoc->cookie_how)) 2034 asoc->cookie_how[how_indx] = 16; 2035 /* all other cases... */ 2036 return (NULL); 2037 } 2038 2039 2040 /* 2041 * handle a state cookie for a new association m: input packet mbuf chain-- 2042 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2043 * and the cookie signature does not exist offset: offset into mbuf to the 2044 * cookie-echo chunk length: length of the cookie chunk to: where the init 2045 * was from returns a new TCB 2046 */ 2047 static struct sctp_tcb * 2048 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2049 struct sockaddr *src, struct sockaddr *dst, 2050 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2051 struct sctp_inpcb *inp, struct sctp_nets **netp, 2052 struct sockaddr *init_src, int *notification, 2053 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2054 uint8_t mflowtype, uint32_t mflowid, 2055 uint32_t vrf_id, uint16_t port) 2056 { 2057 struct sctp_tcb *stcb; 2058 struct sctp_init_chunk *init_cp, init_buf; 2059 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2060 union sctp_sockstore store; 2061 struct sctp_association *asoc; 2062 int init_offset, initack_offset, initack_limit; 2063 int retval; 2064 int error = 0; 2065 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2066 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2067 struct socket *so; 2068 2069 so = SCTP_INP_SO(inp); 2070 #endif 2071 2072 /* 2073 * find and validate the INIT chunk in the cookie (peer's info) the 2074 * INIT should start after the cookie-echo header struct (chunk 2075 * header, state cookie header struct) 2076 */ 2077 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2078 init_cp = (struct sctp_init_chunk *) 2079 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2080 (uint8_t *)&init_buf); 2081 if (init_cp == NULL) { 2082 /* could not pull a INIT chunk in cookie */ 2083 SCTPDBG(SCTP_DEBUG_INPUT1, 2084 "process_cookie_new: could not pull INIT chunk hdr\n"); 2085 return (NULL); 2086 } 2087 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2088 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2089 return (NULL); 2090 } 2091 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2092 /* 2093 * find and validate the INIT-ACK chunk in the cookie (my info) the 2094 * INIT-ACK follows the INIT chunk 2095 */ 2096 initack_cp = (struct sctp_init_ack_chunk *) 2097 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2098 (uint8_t *)&initack_buf); 2099 if (initack_cp == NULL) { 2100 /* could not pull INIT-ACK chunk in cookie */ 2101 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2102 return (NULL); 2103 } 2104 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2105 return (NULL); 2106 } 2107 /* 2108 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2109 * "initack_limit" value. This is because the chk_length field 2110 * includes the length of the cookie, but the cookie is omitted when 2111 * the INIT and INIT_ACK are tacked onto the cookie... 2112 */ 2113 initack_limit = offset + cookie_len; 2114 2115 /* 2116 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2117 * and popluate 2118 */ 2119 2120 /* 2121 * Here we do a trick, we set in NULL for the proc/thread argument. 2122 * We do this since in effect we only use the p argument when the 2123 * socket is unbound and we must do an implicit bind. Since we are 2124 * getting a cookie, we cannot be unbound. 2125 */ 2126 stcb = sctp_aloc_assoc(inp, init_src, &error, 2127 ntohl(initack_cp->init.initiate_tag), vrf_id, 2128 ntohs(initack_cp->init.num_outbound_streams), 2129 port, 2130 (struct thread *)NULL 2131 ); 2132 if (stcb == NULL) { 2133 struct mbuf *op_err; 2134 2135 /* memory problem? */ 2136 SCTPDBG(SCTP_DEBUG_INPUT1, 2137 "process_cookie_new: no room for another TCB!\n"); 2138 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2139 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2140 src, dst, sh, op_err, 2141 mflowtype, mflowid, 2142 vrf_id, port); 2143 return (NULL); 2144 } 2145 /* get the correct sctp_nets */ 2146 if (netp) 2147 *netp = sctp_findnet(stcb, init_src); 2148 2149 asoc = &stcb->asoc; 2150 /* get scope variables out of cookie */ 2151 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2152 asoc->scope.site_scope = cookie->site_scope; 2153 asoc->scope.local_scope = cookie->local_scope; 2154 asoc->scope.loopback_scope = cookie->loopback_scope; 2155 2156 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2157 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2158 struct mbuf *op_err; 2159 2160 /* 2161 * Houston we have a problem. The EP changed while the 2162 * cookie was in flight. Only recourse is to abort the 2163 * association. 2164 */ 2165 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2166 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2167 src, dst, sh, op_err, 2168 mflowtype, mflowid, 2169 vrf_id, port); 2170 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2171 atomic_add_int(&stcb->asoc.refcnt, 1); 2172 SCTP_TCB_UNLOCK(stcb); 2173 SCTP_SOCKET_LOCK(so, 1); 2174 SCTP_TCB_LOCK(stcb); 2175 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2176 #endif 2177 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2178 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2180 SCTP_SOCKET_UNLOCK(so, 1); 2181 #endif 2182 return (NULL); 2183 } 2184 /* process the INIT-ACK info (my info) */ 2185 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2186 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2187 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2188 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2189 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2190 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2191 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2192 asoc->str_reset_seq_in = asoc->init_seq_number; 2193 2194 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2195 2196 /* process the INIT info (peer's info) */ 2197 if (netp) 2198 retval = sctp_process_init(init_cp, stcb); 2199 else 2200 retval = 0; 2201 if (retval < 0) { 2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2203 atomic_add_int(&stcb->asoc.refcnt, 1); 2204 SCTP_TCB_UNLOCK(stcb); 2205 SCTP_SOCKET_LOCK(so, 1); 2206 SCTP_TCB_LOCK(stcb); 2207 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2208 #endif 2209 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2210 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2212 SCTP_SOCKET_UNLOCK(so, 1); 2213 #endif 2214 return (NULL); 2215 } 2216 /* load all addresses */ 2217 if (sctp_load_addresses_from_init(stcb, m, 2218 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2219 src, dst, init_src, port)) { 2220 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2221 atomic_add_int(&stcb->asoc.refcnt, 1); 2222 SCTP_TCB_UNLOCK(stcb); 2223 SCTP_SOCKET_LOCK(so, 1); 2224 SCTP_TCB_LOCK(stcb); 2225 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2226 #endif 2227 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2228 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2229 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2230 SCTP_SOCKET_UNLOCK(so, 1); 2231 #endif 2232 return (NULL); 2233 } 2234 /* 2235 * verify any preceding AUTH chunk that was skipped 2236 */ 2237 /* pull the local authentication parameters from the cookie/init-ack */ 2238 sctp_auth_get_cookie_params(stcb, m, 2239 initack_offset + sizeof(struct sctp_init_ack_chunk), 2240 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2241 if (auth_skipped) { 2242 struct sctp_auth_chunk *auth; 2243 2244 auth = (struct sctp_auth_chunk *) 2245 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2246 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2247 /* auth HMAC failed, dump the assoc and packet */ 2248 SCTPDBG(SCTP_DEBUG_AUTH1, 2249 "COOKIE-ECHO: AUTH failed\n"); 2250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2251 atomic_add_int(&stcb->asoc.refcnt, 1); 2252 SCTP_TCB_UNLOCK(stcb); 2253 SCTP_SOCKET_LOCK(so, 1); 2254 SCTP_TCB_LOCK(stcb); 2255 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2256 #endif 2257 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2258 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2259 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2260 SCTP_SOCKET_UNLOCK(so, 1); 2261 #endif 2262 return (NULL); 2263 } else { 2264 /* remaining chunks checked... good to go */ 2265 stcb->asoc.authenticated = 1; 2266 } 2267 } 2268 /* 2269 * if we're doing ASCONFs, check to see if we have any new local 2270 * addresses that need to get added to the peer (eg. addresses 2271 * changed while cookie echo in flight). This needs to be done 2272 * after we go to the OPEN state to do the correct asconf 2273 * processing. else, make sure we have the correct addresses in our 2274 * lists 2275 */ 2276 2277 /* warning, we re-use sin, sin6, sa_store here! */ 2278 /* pull in local_address (our "from" address) */ 2279 switch (cookie->laddr_type) { 2280 #ifdef INET 2281 case SCTP_IPV4_ADDRESS: 2282 /* source addr is IPv4 */ 2283 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2284 store.sin.sin_family = AF_INET; 2285 store.sin.sin_len = sizeof(struct sockaddr_in); 2286 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2287 break; 2288 #endif 2289 #ifdef INET6 2290 case SCTP_IPV6_ADDRESS: 2291 /* source addr is IPv6 */ 2292 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2293 store.sin6.sin6_family = AF_INET6; 2294 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2295 store.sin6.sin6_scope_id = cookie->scope_id; 2296 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2297 break; 2298 #endif 2299 default: 2300 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2301 atomic_add_int(&stcb->asoc.refcnt, 1); 2302 SCTP_TCB_UNLOCK(stcb); 2303 SCTP_SOCKET_LOCK(so, 1); 2304 SCTP_TCB_LOCK(stcb); 2305 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2306 #endif 2307 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2308 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2309 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2310 SCTP_SOCKET_UNLOCK(so, 1); 2311 #endif 2312 return (NULL); 2313 } 2314 2315 /* update current state */ 2316 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2317 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2318 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2319 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2320 stcb->sctp_ep, stcb, asoc->primary_destination); 2321 } 2322 sctp_stop_all_cookie_timers(stcb); 2323 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2324 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2325 2326 /* set up to notify upper layer */ 2327 *notification = SCTP_NOTIFY_ASSOC_UP; 2328 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2329 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2330 (!SCTP_IS_LISTENING(inp))) { 2331 /* 2332 * This is an endpoint that called connect() how it got a 2333 * cookie that is NEW is a bit of a mystery. It must be that 2334 * the INIT was sent, but before it got there.. a complete 2335 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2336 * should have went to the other code.. not here.. oh well.. 2337 * a bit of protection is worth having.. 2338 */ 2339 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2340 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2341 atomic_add_int(&stcb->asoc.refcnt, 1); 2342 SCTP_TCB_UNLOCK(stcb); 2343 SCTP_SOCKET_LOCK(so, 1); 2344 SCTP_TCB_LOCK(stcb); 2345 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2346 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2347 SCTP_SOCKET_UNLOCK(so, 1); 2348 return (NULL); 2349 } 2350 #endif 2351 soisconnected(stcb->sctp_socket); 2352 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2353 SCTP_SOCKET_UNLOCK(so, 1); 2354 #endif 2355 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2356 (SCTP_IS_LISTENING(inp))) { 2357 /* 2358 * We don't want to do anything with this one. Since it is 2359 * the listening guy. The timer will get started for 2360 * accepted connections in the caller. 2361 */ 2362 ; 2363 } 2364 /* since we did not send a HB make sure we don't double things */ 2365 if ((netp) && (*netp)) 2366 (*netp)->hb_responded = 1; 2367 2368 if (stcb->asoc.sctp_autoclose_ticks && 2369 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2370 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2371 } 2372 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2373 if ((netp != NULL) && (*netp != NULL)) { 2374 struct timeval old; 2375 2376 /* calculate the RTT and set the encaps port */ 2377 old.tv_sec = cookie->time_entered.tv_sec; 2378 old.tv_usec = cookie->time_entered.tv_usec; 2379 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2380 &old, SCTP_RTT_FROM_NON_DATA); 2381 } 2382 /* respond with a COOKIE-ACK */ 2383 sctp_send_cookie_ack(stcb); 2384 2385 /* 2386 * check the address lists for any ASCONFs that need to be sent 2387 * AFTER the cookie-ack is sent 2388 */ 2389 sctp_check_address_list(stcb, m, 2390 initack_offset + sizeof(struct sctp_init_ack_chunk), 2391 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2392 &store.sa, cookie->local_scope, cookie->site_scope, 2393 cookie->ipv4_scope, cookie->loopback_scope); 2394 2395 2396 return (stcb); 2397 } 2398 2399 /* 2400 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2401 * we NEED to make sure we are not already using the vtag. If so we 2402 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2403 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2404 SCTP_BASE_INFO(hashasocmark))]; 2405 LIST_FOREACH(stcb, head, sctp_asocs) { 2406 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2407 -- SEND ABORT - TRY AGAIN -- 2408 } 2409 } 2410 */ 2411 2412 /* 2413 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2414 * existing (non-NULL) TCB 2415 */ 2416 static struct mbuf * 2417 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2418 struct sockaddr *src, struct sockaddr *dst, 2419 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2420 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2421 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2422 struct sctp_tcb **locked_tcb, 2423 uint8_t mflowtype, uint32_t mflowid, 2424 uint32_t vrf_id, uint16_t port) 2425 { 2426 struct sctp_state_cookie *cookie; 2427 struct sctp_tcb *l_stcb = *stcb; 2428 struct sctp_inpcb *l_inp; 2429 struct sockaddr *to; 2430 struct sctp_pcb *ep; 2431 struct mbuf *m_sig; 2432 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2433 uint8_t *sig; 2434 uint8_t cookie_ok = 0; 2435 unsigned int sig_offset, cookie_offset; 2436 unsigned int cookie_len; 2437 struct timeval now; 2438 struct timeval time_expires; 2439 int notification = 0; 2440 struct sctp_nets *netl; 2441 int had_a_existing_tcb = 0; 2442 int send_int_conf = 0; 2443 #ifdef INET 2444 struct sockaddr_in sin; 2445 #endif 2446 #ifdef INET6 2447 struct sockaddr_in6 sin6; 2448 #endif 2449 2450 SCTPDBG(SCTP_DEBUG_INPUT2, 2451 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2452 2453 if (inp_p == NULL) { 2454 return (NULL); 2455 } 2456 cookie = &cp->cookie; 2457 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2458 cookie_len = ntohs(cp->ch.chunk_length); 2459 2460 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2461 sizeof(struct sctp_init_chunk) + 2462 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2463 /* cookie too small */ 2464 return (NULL); 2465 } 2466 if ((cookie->peerport != sh->src_port) || 2467 (cookie->myport != sh->dest_port) || 2468 (cookie->my_vtag != sh->v_tag)) { 2469 /* 2470 * invalid ports or bad tag. Note that we always leave the 2471 * v_tag in the header in network order and when we stored 2472 * it in the my_vtag slot we also left it in network order. 2473 * This maintains the match even though it may be in the 2474 * opposite byte order of the machine :-> 2475 */ 2476 return (NULL); 2477 } 2478 /* 2479 * split off the signature into its own mbuf (since it should not be 2480 * calculated in the sctp_hmac_m() call). 2481 */ 2482 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2483 m_sig = m_split(m, sig_offset, M_NOWAIT); 2484 if (m_sig == NULL) { 2485 /* out of memory or ?? */ 2486 return (NULL); 2487 } 2488 #ifdef SCTP_MBUF_LOGGING 2489 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2490 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2491 } 2492 #endif 2493 2494 /* 2495 * compute the signature/digest for the cookie 2496 */ 2497 ep = &(*inp_p)->sctp_ep; 2498 l_inp = *inp_p; 2499 if (l_stcb) { 2500 SCTP_TCB_UNLOCK(l_stcb); 2501 } 2502 SCTP_INP_RLOCK(l_inp); 2503 if (l_stcb) { 2504 SCTP_TCB_LOCK(l_stcb); 2505 } 2506 /* which cookie is it? */ 2507 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2508 (ep->current_secret_number != ep->last_secret_number)) { 2509 /* it's the old cookie */ 2510 (void)sctp_hmac_m(SCTP_HMAC, 2511 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2512 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2513 } else { 2514 /* it's the current cookie */ 2515 (void)sctp_hmac_m(SCTP_HMAC, 2516 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2517 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2518 } 2519 /* get the signature */ 2520 SCTP_INP_RUNLOCK(l_inp); 2521 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2522 if (sig == NULL) { 2523 /* couldn't find signature */ 2524 sctp_m_freem(m_sig); 2525 return (NULL); 2526 } 2527 /* compare the received digest with the computed digest */ 2528 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2529 /* try the old cookie? */ 2530 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2531 (ep->current_secret_number != ep->last_secret_number)) { 2532 /* compute digest with old */ 2533 (void)sctp_hmac_m(SCTP_HMAC, 2534 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2535 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2536 /* compare */ 2537 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2538 cookie_ok = 1; 2539 } 2540 } else { 2541 cookie_ok = 1; 2542 } 2543 2544 /* 2545 * Now before we continue we must reconstruct our mbuf so that 2546 * normal processing of any other chunks will work. 2547 */ 2548 { 2549 struct mbuf *m_at; 2550 2551 m_at = m; 2552 while (SCTP_BUF_NEXT(m_at) != NULL) { 2553 m_at = SCTP_BUF_NEXT(m_at); 2554 } 2555 SCTP_BUF_NEXT(m_at) = m_sig; 2556 } 2557 2558 if (cookie_ok == 0) { 2559 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2560 SCTPDBG(SCTP_DEBUG_INPUT2, 2561 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2562 (uint32_t)offset, cookie_offset, sig_offset); 2563 return (NULL); 2564 } 2565 /* 2566 * check the cookie timestamps to be sure it's not stale 2567 */ 2568 (void)SCTP_GETTIME_TIMEVAL(&now); 2569 /* Expire time is in Ticks, so we convert to seconds */ 2570 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2571 time_expires.tv_usec = cookie->time_entered.tv_usec; 2572 if (timevalcmp(&now, &time_expires, >)) { 2573 /* cookie is stale! */ 2574 struct mbuf *op_err; 2575 struct sctp_error_stale_cookie *cause; 2576 struct timeval diff; 2577 uint32_t staleness; 2578 2579 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2580 0, M_NOWAIT, 1, MT_DATA); 2581 if (op_err == NULL) { 2582 /* FOOBAR */ 2583 return (NULL); 2584 } 2585 /* Set the len */ 2586 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2587 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2588 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2589 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2590 (sizeof(uint32_t)))); 2591 diff = now; 2592 timevalsub(&diff, &time_expires); 2593 if (diff.tv_sec > UINT32_MAX / 1000000) { 2594 staleness = UINT32_MAX; 2595 } else { 2596 staleness = diff.tv_sec * 1000000; 2597 } 2598 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2599 staleness += diff.tv_usec; 2600 } else { 2601 staleness = UINT32_MAX; 2602 } 2603 cause->stale_time = htonl(staleness); 2604 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2605 mflowtype, mflowid, l_inp->fibnum, 2606 vrf_id, port); 2607 return (NULL); 2608 } 2609 /* 2610 * Now we must see with the lookup address if we have an existing 2611 * asoc. This will only happen if we were in the COOKIE-WAIT state 2612 * and a INIT collided with us and somewhere the peer sent the 2613 * cookie on another address besides the single address our assoc 2614 * had for him. In this case we will have one of the tie-tags set at 2615 * least AND the address field in the cookie can be used to look it 2616 * up. 2617 */ 2618 to = NULL; 2619 switch (cookie->addr_type) { 2620 #ifdef INET6 2621 case SCTP_IPV6_ADDRESS: 2622 memset(&sin6, 0, sizeof(sin6)); 2623 sin6.sin6_family = AF_INET6; 2624 sin6.sin6_len = sizeof(sin6); 2625 sin6.sin6_port = sh->src_port; 2626 sin6.sin6_scope_id = cookie->scope_id; 2627 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2628 sizeof(sin6.sin6_addr.s6_addr)); 2629 to = (struct sockaddr *)&sin6; 2630 break; 2631 #endif 2632 #ifdef INET 2633 case SCTP_IPV4_ADDRESS: 2634 memset(&sin, 0, sizeof(sin)); 2635 sin.sin_family = AF_INET; 2636 sin.sin_len = sizeof(sin); 2637 sin.sin_port = sh->src_port; 2638 sin.sin_addr.s_addr = cookie->address[0]; 2639 to = (struct sockaddr *)&sin; 2640 break; 2641 #endif 2642 default: 2643 /* This should not happen */ 2644 return (NULL); 2645 } 2646 if (*stcb == NULL) { 2647 /* Yep, lets check */ 2648 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2649 if (*stcb == NULL) { 2650 /* 2651 * We should have only got back the same inp. If we 2652 * got back a different ep we have a problem. The 2653 * original findep got back l_inp and now 2654 */ 2655 if (l_inp != *inp_p) { 2656 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2657 } 2658 } else { 2659 if (*locked_tcb == NULL) { 2660 /* 2661 * In this case we found the assoc only 2662 * after we locked the create lock. This 2663 * means we are in a colliding case and we 2664 * must make sure that we unlock the tcb if 2665 * its one of the cases where we throw away 2666 * the incoming packets. 2667 */ 2668 *locked_tcb = *stcb; 2669 2670 /* 2671 * We must also increment the inp ref count 2672 * since the ref_count flags was set when we 2673 * did not find the TCB, now we found it 2674 * which reduces the refcount.. we must 2675 * raise it back out to balance it all :-) 2676 */ 2677 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2678 if ((*stcb)->sctp_ep != l_inp) { 2679 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2680 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2681 } 2682 } 2683 } 2684 } 2685 cookie_len -= SCTP_SIGNATURE_SIZE; 2686 if (*stcb == NULL) { 2687 /* this is the "normal" case... get a new TCB */ 2688 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2689 cookie, cookie_len, *inp_p, 2690 netp, to, ¬ification, 2691 auth_skipped, auth_offset, auth_len, 2692 mflowtype, mflowid, 2693 vrf_id, port); 2694 } else { 2695 /* this is abnormal... cookie-echo on existing TCB */ 2696 had_a_existing_tcb = 1; 2697 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2698 src, dst, sh, 2699 cookie, cookie_len, *inp_p, *stcb, netp, to, 2700 ¬ification, auth_skipped, auth_offset, auth_len, 2701 mflowtype, mflowid, 2702 vrf_id, port); 2703 } 2704 2705 if (*stcb == NULL) { 2706 /* still no TCB... must be bad cookie-echo */ 2707 return (NULL); 2708 } 2709 if (*netp != NULL) { 2710 (*netp)->flowtype = mflowtype; 2711 (*netp)->flowid = mflowid; 2712 } 2713 /* 2714 * Ok, we built an association so confirm the address we sent the 2715 * INIT-ACK to. 2716 */ 2717 netl = sctp_findnet(*stcb, to); 2718 /* 2719 * This code should in theory NOT run but 2720 */ 2721 if (netl == NULL) { 2722 /* TSNH! Huh, why do I need to add this address here? */ 2723 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2724 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2725 return (NULL); 2726 } 2727 netl = sctp_findnet(*stcb, to); 2728 } 2729 if (netl) { 2730 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2731 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2732 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2733 netl); 2734 send_int_conf = 1; 2735 } 2736 } 2737 sctp_start_net_timers(*stcb); 2738 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2739 if (!had_a_existing_tcb || 2740 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2741 /* 2742 * If we have a NEW cookie or the connect never 2743 * reached the connected state during collision we 2744 * must do the TCP accept thing. 2745 */ 2746 struct socket *so, *oso; 2747 struct sctp_inpcb *inp; 2748 2749 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2750 /* 2751 * For a restart we will keep the same 2752 * socket, no need to do anything. I THINK!! 2753 */ 2754 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2755 if (send_int_conf) { 2756 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2757 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2758 } 2759 return (m); 2760 } 2761 oso = (*inp_p)->sctp_socket; 2762 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2763 SCTP_TCB_UNLOCK((*stcb)); 2764 CURVNET_SET(oso->so_vnet); 2765 so = sonewconn(oso, 0 2766 ); 2767 CURVNET_RESTORE(); 2768 SCTP_TCB_LOCK((*stcb)); 2769 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2770 2771 if (so == NULL) { 2772 struct mbuf *op_err; 2773 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2774 struct socket *pcb_so; 2775 #endif 2776 /* Too many sockets */ 2777 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2778 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2779 sctp_abort_association(*inp_p, NULL, m, iphlen, 2780 src, dst, sh, op_err, 2781 mflowtype, mflowid, 2782 vrf_id, port); 2783 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2784 pcb_so = SCTP_INP_SO(*inp_p); 2785 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2786 SCTP_TCB_UNLOCK((*stcb)); 2787 SCTP_SOCKET_LOCK(pcb_so, 1); 2788 SCTP_TCB_LOCK((*stcb)); 2789 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2790 #endif 2791 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2792 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2793 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2794 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2795 #endif 2796 return (NULL); 2797 } 2798 inp = (struct sctp_inpcb *)so->so_pcb; 2799 SCTP_INP_INCR_REF(inp); 2800 /* 2801 * We add the unbound flag here so that if we get an 2802 * soabort() before we get the move_pcb done, we 2803 * will properly cleanup. 2804 */ 2805 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2806 SCTP_PCB_FLAGS_CONNECTED | 2807 SCTP_PCB_FLAGS_IN_TCPPOOL | 2808 SCTP_PCB_FLAGS_UNBOUND | 2809 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2810 SCTP_PCB_FLAGS_DONT_WAKE); 2811 inp->sctp_features = (*inp_p)->sctp_features; 2812 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2813 inp->sctp_socket = so; 2814 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2815 inp->max_cwnd = (*inp_p)->max_cwnd; 2816 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2817 inp->ecn_supported = (*inp_p)->ecn_supported; 2818 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2819 inp->auth_supported = (*inp_p)->auth_supported; 2820 inp->asconf_supported = (*inp_p)->asconf_supported; 2821 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2822 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2823 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2824 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2825 inp->sctp_context = (*inp_p)->sctp_context; 2826 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2827 inp->fibnum = (*inp_p)->fibnum; 2828 inp->inp_starting_point_for_iterator = NULL; 2829 /* 2830 * copy in the authentication parameters from the 2831 * original endpoint 2832 */ 2833 if (inp->sctp_ep.local_hmacs) 2834 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2835 inp->sctp_ep.local_hmacs = 2836 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2837 if (inp->sctp_ep.local_auth_chunks) 2838 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2839 inp->sctp_ep.local_auth_chunks = 2840 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2841 2842 /* 2843 * Now we must move it from one hash table to 2844 * another and get the tcb in the right place. 2845 */ 2846 2847 /* 2848 * This is where the one-2-one socket is put into 2849 * the accept state waiting for the accept! 2850 */ 2851 if (*stcb) { 2852 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2853 } 2854 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2855 2856 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2857 SCTP_TCB_UNLOCK((*stcb)); 2858 2859 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2860 0); 2861 SCTP_TCB_LOCK((*stcb)); 2862 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2863 2864 2865 /* 2866 * now we must check to see if we were aborted while 2867 * the move was going on and the lock/unlock 2868 * happened. 2869 */ 2870 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2871 /* 2872 * yep it was, we leave the assoc attached 2873 * to the socket since the sctp_inpcb_free() 2874 * call will send an abort for us. 2875 */ 2876 SCTP_INP_DECR_REF(inp); 2877 return (NULL); 2878 } 2879 SCTP_INP_DECR_REF(inp); 2880 /* Switch over to the new guy */ 2881 *inp_p = inp; 2882 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2883 if (send_int_conf) { 2884 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2885 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2886 } 2887 /* 2888 * Pull it from the incomplete queue and wake the 2889 * guy 2890 */ 2891 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2892 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2893 SCTP_TCB_UNLOCK((*stcb)); 2894 SCTP_SOCKET_LOCK(so, 1); 2895 #endif 2896 soisconnected(so); 2897 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2898 SCTP_TCB_LOCK((*stcb)); 2899 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2900 SCTP_SOCKET_UNLOCK(so, 1); 2901 #endif 2902 return (m); 2903 } 2904 } 2905 if (notification) { 2906 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2907 } 2908 if (send_int_conf) { 2909 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2910 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2911 } 2912 return (m); 2913 } 2914 2915 static void 2916 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2917 struct sctp_tcb *stcb, struct sctp_nets *net) 2918 { 2919 /* cp must not be used, others call this without a c-ack :-) */ 2920 struct sctp_association *asoc; 2921 2922 SCTPDBG(SCTP_DEBUG_INPUT2, 2923 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2924 if ((stcb == NULL) || (net == NULL)) { 2925 return; 2926 } 2927 asoc = &stcb->asoc; 2928 2929 sctp_stop_all_cookie_timers(stcb); 2930 /* process according to association state */ 2931 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2932 /* state change only needed when I am in right state */ 2933 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2934 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2935 sctp_start_net_timers(stcb); 2936 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2937 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2938 stcb->sctp_ep, stcb, asoc->primary_destination); 2939 2940 } 2941 /* update RTO */ 2942 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2943 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2944 if (asoc->overall_error_count == 0) { 2945 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2946 &asoc->time_entered, 2947 SCTP_RTT_FROM_NON_DATA); 2948 } 2949 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2950 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2951 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2952 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2953 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2954 struct socket *so; 2955 2956 #endif 2957 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2958 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2959 so = SCTP_INP_SO(stcb->sctp_ep); 2960 atomic_add_int(&stcb->asoc.refcnt, 1); 2961 SCTP_TCB_UNLOCK(stcb); 2962 SCTP_SOCKET_LOCK(so, 1); 2963 SCTP_TCB_LOCK(stcb); 2964 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2965 #endif 2966 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2967 soisconnected(stcb->sctp_socket); 2968 } 2969 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2970 SCTP_SOCKET_UNLOCK(so, 1); 2971 #endif 2972 } 2973 /* 2974 * since we did not send a HB make sure we don't double 2975 * things 2976 */ 2977 net->hb_responded = 1; 2978 2979 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2980 /* 2981 * We don't need to do the asconf thing, nor hb or 2982 * autoclose if the socket is closed. 2983 */ 2984 goto closed_socket; 2985 } 2986 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2987 stcb, net); 2988 2989 2990 if (stcb->asoc.sctp_autoclose_ticks && 2991 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2992 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2993 stcb->sctp_ep, stcb, NULL); 2994 } 2995 /* 2996 * send ASCONF if parameters are pending and ASCONFs are 2997 * allowed (eg. addresses changed when init/cookie echo were 2998 * in flight) 2999 */ 3000 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3001 (stcb->asoc.asconf_supported == 1) && 3002 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3003 #ifdef SCTP_TIMER_BASED_ASCONF 3004 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3005 stcb->sctp_ep, stcb, 3006 stcb->asoc.primary_destination); 3007 #else 3008 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3009 SCTP_ADDR_NOT_LOCKED); 3010 #endif 3011 } 3012 } 3013 closed_socket: 3014 /* Toss the cookie if I can */ 3015 sctp_toss_old_cookies(stcb, asoc); 3016 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3017 /* Restart the timer if we have pending data */ 3018 struct sctp_tmit_chunk *chk; 3019 3020 chk = TAILQ_FIRST(&asoc->sent_queue); 3021 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3022 } 3023 } 3024 3025 static void 3026 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3027 struct sctp_tcb *stcb) 3028 { 3029 struct sctp_nets *net; 3030 struct sctp_tmit_chunk *lchk; 3031 struct sctp_ecne_chunk bkup; 3032 uint8_t override_bit; 3033 uint32_t tsn, window_data_tsn; 3034 int len; 3035 unsigned int pkt_cnt; 3036 3037 len = ntohs(cp->ch.chunk_length); 3038 if ((len != sizeof(struct sctp_ecne_chunk)) && 3039 (len != sizeof(struct old_sctp_ecne_chunk))) { 3040 return; 3041 } 3042 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3043 /* Its the old format */ 3044 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3045 bkup.num_pkts_since_cwr = htonl(1); 3046 cp = &bkup; 3047 } 3048 SCTP_STAT_INCR(sctps_recvecne); 3049 tsn = ntohl(cp->tsn); 3050 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3051 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3052 if (lchk == NULL) { 3053 window_data_tsn = stcb->asoc.sending_seq - 1; 3054 } else { 3055 window_data_tsn = lchk->rec.data.tsn; 3056 } 3057 3058 /* Find where it was sent to if possible. */ 3059 net = NULL; 3060 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3061 if (lchk->rec.data.tsn == tsn) { 3062 net = lchk->whoTo; 3063 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3064 break; 3065 } 3066 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3067 break; 3068 } 3069 } 3070 if (net == NULL) { 3071 /* 3072 * What to do. A previous send of a CWR was possibly lost. 3073 * See how old it is, we may have it marked on the actual 3074 * net. 3075 */ 3076 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3077 if (tsn == net->last_cwr_tsn) { 3078 /* Found him, send it off */ 3079 break; 3080 } 3081 } 3082 if (net == NULL) { 3083 /* 3084 * If we reach here, we need to send a special CWR 3085 * that says hey, we did this a long time ago and 3086 * you lost the response. 3087 */ 3088 net = TAILQ_FIRST(&stcb->asoc.nets); 3089 if (net == NULL) { 3090 /* TSNH */ 3091 return; 3092 } 3093 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3094 } else { 3095 override_bit = 0; 3096 } 3097 } else { 3098 override_bit = 0; 3099 } 3100 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3101 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3102 /* 3103 * JRS - Use the congestion control given in the pluggable 3104 * CC module 3105 */ 3106 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3107 /* 3108 * We reduce once every RTT. So we will only lower cwnd at 3109 * the next sending seq i.e. the window_data_tsn 3110 */ 3111 net->cwr_window_tsn = window_data_tsn; 3112 net->ecn_ce_pkt_cnt += pkt_cnt; 3113 net->lost_cnt = pkt_cnt; 3114 net->last_cwr_tsn = tsn; 3115 } else { 3116 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3117 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3118 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3119 /* 3120 * Another loss in the same window update how many 3121 * marks/packets lost we have had. 3122 */ 3123 int cnt = 1; 3124 3125 if (pkt_cnt > net->lost_cnt) { 3126 /* Should be the case */ 3127 cnt = (pkt_cnt - net->lost_cnt); 3128 net->ecn_ce_pkt_cnt += cnt; 3129 } 3130 net->lost_cnt = pkt_cnt; 3131 net->last_cwr_tsn = tsn; 3132 /* 3133 * Most CC functions will ignore this call, since we 3134 * are in-window yet of the initial CE the peer saw. 3135 */ 3136 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3137 } 3138 } 3139 /* 3140 * We always send a CWR this way if our previous one was lost our 3141 * peer will get an update, or if it is not time again to reduce we 3142 * still get the cwr to the peer. Note we set the override when we 3143 * could not find the TSN on the chunk or the destination network. 3144 */ 3145 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3146 } 3147 3148 static void 3149 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3150 { 3151 /* 3152 * Here we get a CWR from the peer. We must look in the outqueue and 3153 * make sure that we have a covered ECNE in the control chunk part. 3154 * If so remove it. 3155 */ 3156 struct sctp_tmit_chunk *chk, *nchk; 3157 struct sctp_ecne_chunk *ecne; 3158 int override; 3159 uint32_t cwr_tsn; 3160 3161 cwr_tsn = ntohl(cp->tsn); 3162 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3163 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3164 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3165 continue; 3166 } 3167 if ((override == 0) && (chk->whoTo != net)) { 3168 /* Must be from the right src unless override is set */ 3169 continue; 3170 } 3171 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3172 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3173 /* this covers this ECNE, we can remove it */ 3174 stcb->asoc.ecn_echo_cnt_onq--; 3175 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3176 sctp_next); 3177 sctp_m_freem(chk->data); 3178 chk->data = NULL; 3179 stcb->asoc.ctrl_queue_cnt--; 3180 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3181 if (override == 0) { 3182 break; 3183 } 3184 } 3185 } 3186 } 3187 3188 static void 3189 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3190 struct sctp_tcb *stcb, struct sctp_nets *net) 3191 { 3192 struct sctp_association *asoc; 3193 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3194 struct socket *so; 3195 #endif 3196 3197 SCTPDBG(SCTP_DEBUG_INPUT2, 3198 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3199 if (stcb == NULL) 3200 return; 3201 3202 asoc = &stcb->asoc; 3203 /* process according to association state */ 3204 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3205 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3206 SCTPDBG(SCTP_DEBUG_INPUT2, 3207 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3208 SCTP_TCB_UNLOCK(stcb); 3209 return; 3210 } 3211 /* notify upper layer protocol */ 3212 if (stcb->sctp_socket) { 3213 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3214 } 3215 #ifdef INVARIANTS 3216 if (!TAILQ_EMPTY(&asoc->send_queue) || 3217 !TAILQ_EMPTY(&asoc->sent_queue) || 3218 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3219 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3220 } 3221 #endif 3222 /* stop the timer */ 3223 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3224 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3225 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3226 /* free the TCB */ 3227 SCTPDBG(SCTP_DEBUG_INPUT2, 3228 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3229 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3230 so = SCTP_INP_SO(stcb->sctp_ep); 3231 atomic_add_int(&stcb->asoc.refcnt, 1); 3232 SCTP_TCB_UNLOCK(stcb); 3233 SCTP_SOCKET_LOCK(so, 1); 3234 SCTP_TCB_LOCK(stcb); 3235 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3236 #endif 3237 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3238 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3240 SCTP_SOCKET_UNLOCK(so, 1); 3241 #endif 3242 return; 3243 } 3244 3245 static int 3246 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3247 struct sctp_nets *net, uint8_t flg) 3248 { 3249 switch (desc->chunk_type) { 3250 case SCTP_DATA: 3251 /* find the tsn to resend (possibly */ 3252 { 3253 uint32_t tsn; 3254 struct sctp_tmit_chunk *tp1; 3255 3256 tsn = ntohl(desc->tsn_ifany); 3257 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3258 if (tp1->rec.data.tsn == tsn) { 3259 /* found it */ 3260 break; 3261 } 3262 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3263 /* not found */ 3264 tp1 = NULL; 3265 break; 3266 } 3267 } 3268 if (tp1 == NULL) { 3269 /* 3270 * Do it the other way , aka without paying 3271 * attention to queue seq order. 3272 */ 3273 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3274 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3275 if (tp1->rec.data.tsn == tsn) { 3276 /* found it */ 3277 break; 3278 } 3279 } 3280 } 3281 if (tp1 == NULL) { 3282 SCTP_STAT_INCR(sctps_pdrptsnnf); 3283 } 3284 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3285 uint8_t *ddp; 3286 3287 if (((flg & SCTP_BADCRC) == 0) && 3288 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3289 return (0); 3290 } 3291 if ((stcb->asoc.peers_rwnd == 0) && 3292 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3293 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3294 return (0); 3295 } 3296 if (stcb->asoc.peers_rwnd == 0 && 3297 (flg & SCTP_FROM_MIDDLE_BOX)) { 3298 SCTP_STAT_INCR(sctps_pdrpdizrw); 3299 return (0); 3300 } 3301 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3302 sizeof(struct sctp_data_chunk)); 3303 { 3304 unsigned int iii; 3305 3306 for (iii = 0; iii < sizeof(desc->data_bytes); 3307 iii++) { 3308 if (ddp[iii] != desc->data_bytes[iii]) { 3309 SCTP_STAT_INCR(sctps_pdrpbadd); 3310 return (-1); 3311 } 3312 } 3313 } 3314 3315 if (tp1->do_rtt) { 3316 /* 3317 * this guy had a RTO calculation 3318 * pending on it, cancel it 3319 */ 3320 if (tp1->whoTo->rto_needed == 0) { 3321 tp1->whoTo->rto_needed = 1; 3322 } 3323 tp1->do_rtt = 0; 3324 } 3325 SCTP_STAT_INCR(sctps_pdrpmark); 3326 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3327 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3328 /* 3329 * mark it as if we were doing a FR, since 3330 * we will be getting gap ack reports behind 3331 * the info from the router. 3332 */ 3333 tp1->rec.data.doing_fast_retransmit = 1; 3334 /* 3335 * mark the tsn with what sequences can 3336 * cause a new FR. 3337 */ 3338 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3339 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3340 } else { 3341 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3342 } 3343 3344 /* restart the timer */ 3345 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3346 stcb, tp1->whoTo, 3347 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3348 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3349 stcb, tp1->whoTo); 3350 3351 /* fix counts and things */ 3352 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3353 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3354 tp1->whoTo->flight_size, 3355 tp1->book_size, 3356 (uint32_t)(uintptr_t)stcb, 3357 tp1->rec.data.tsn); 3358 } 3359 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3360 sctp_flight_size_decrease(tp1); 3361 sctp_total_flight_decrease(stcb, tp1); 3362 } 3363 tp1->sent = SCTP_DATAGRAM_RESEND; 3364 } { 3365 /* audit code */ 3366 unsigned int audit; 3367 3368 audit = 0; 3369 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3370 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3371 audit++; 3372 } 3373 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3374 sctp_next) { 3375 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3376 audit++; 3377 } 3378 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3379 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3380 audit, stcb->asoc.sent_queue_retran_cnt); 3381 #ifndef SCTP_AUDITING_ENABLED 3382 stcb->asoc.sent_queue_retran_cnt = audit; 3383 #endif 3384 } 3385 } 3386 } 3387 break; 3388 case SCTP_ASCONF: 3389 { 3390 struct sctp_tmit_chunk *asconf; 3391 3392 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3393 sctp_next) { 3394 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3395 break; 3396 } 3397 } 3398 if (asconf) { 3399 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3400 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3401 asconf->sent = SCTP_DATAGRAM_RESEND; 3402 asconf->snd_count--; 3403 } 3404 } 3405 break; 3406 case SCTP_INITIATION: 3407 /* resend the INIT */ 3408 stcb->asoc.dropped_special_cnt++; 3409 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3410 /* 3411 * If we can get it in, in a few attempts we do 3412 * this, otherwise we let the timer fire. 3413 */ 3414 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3415 stcb, net, 3416 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3417 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3418 } 3419 break; 3420 case SCTP_SELECTIVE_ACK: 3421 case SCTP_NR_SELECTIVE_ACK: 3422 /* resend the sack */ 3423 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3424 break; 3425 case SCTP_HEARTBEAT_REQUEST: 3426 /* resend a demand HB */ 3427 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3428 /* 3429 * Only retransmit if we KNOW we wont destroy the 3430 * tcb 3431 */ 3432 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3433 } 3434 break; 3435 case SCTP_SHUTDOWN: 3436 sctp_send_shutdown(stcb, net); 3437 break; 3438 case SCTP_SHUTDOWN_ACK: 3439 sctp_send_shutdown_ack(stcb, net); 3440 break; 3441 case SCTP_COOKIE_ECHO: 3442 { 3443 struct sctp_tmit_chunk *cookie; 3444 3445 cookie = NULL; 3446 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3447 sctp_next) { 3448 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3449 break; 3450 } 3451 } 3452 if (cookie) { 3453 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3454 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3455 cookie->sent = SCTP_DATAGRAM_RESEND; 3456 sctp_stop_all_cookie_timers(stcb); 3457 } 3458 } 3459 break; 3460 case SCTP_COOKIE_ACK: 3461 sctp_send_cookie_ack(stcb); 3462 break; 3463 case SCTP_ASCONF_ACK: 3464 /* resend last asconf ack */ 3465 sctp_send_asconf_ack(stcb); 3466 break; 3467 case SCTP_IFORWARD_CUM_TSN: 3468 case SCTP_FORWARD_CUM_TSN: 3469 send_forward_tsn(stcb, &stcb->asoc); 3470 break; 3471 /* can't do anything with these */ 3472 case SCTP_PACKET_DROPPED: 3473 case SCTP_INITIATION_ACK: /* this should not happen */ 3474 case SCTP_HEARTBEAT_ACK: 3475 case SCTP_ABORT_ASSOCIATION: 3476 case SCTP_OPERATION_ERROR: 3477 case SCTP_SHUTDOWN_COMPLETE: 3478 case SCTP_ECN_ECHO: 3479 case SCTP_ECN_CWR: 3480 default: 3481 break; 3482 } 3483 return (0); 3484 } 3485 3486 void 3487 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3488 { 3489 uint32_t i; 3490 uint16_t temp; 3491 3492 /* 3493 * We set things to 0xffffffff since this is the last delivered 3494 * sequence and we will be sending in 0 after the reset. 3495 */ 3496 3497 if (number_entries) { 3498 for (i = 0; i < number_entries; i++) { 3499 temp = ntohs(list[i]); 3500 if (temp >= stcb->asoc.streamincnt) { 3501 continue; 3502 } 3503 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3504 } 3505 } else { 3506 list = NULL; 3507 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3508 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3509 } 3510 } 3511 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3512 } 3513 3514 static void 3515 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3516 { 3517 uint32_t i; 3518 uint16_t temp; 3519 3520 if (number_entries > 0) { 3521 for (i = 0; i < number_entries; i++) { 3522 temp = ntohs(list[i]); 3523 if (temp >= stcb->asoc.streamoutcnt) { 3524 /* no such stream */ 3525 continue; 3526 } 3527 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3528 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3529 } 3530 } else { 3531 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3532 stcb->asoc.strmout[i].next_mid_ordered = 0; 3533 stcb->asoc.strmout[i].next_mid_unordered = 0; 3534 } 3535 } 3536 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3537 } 3538 3539 static void 3540 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3541 { 3542 uint32_t i; 3543 uint16_t temp; 3544 3545 if (number_entries > 0) { 3546 for (i = 0; i < number_entries; i++) { 3547 temp = ntohs(list[i]); 3548 if (temp >= stcb->asoc.streamoutcnt) { 3549 /* no such stream */ 3550 continue; 3551 } 3552 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3553 } 3554 } else { 3555 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3556 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3557 } 3558 } 3559 } 3560 3561 3562 struct sctp_stream_reset_request * 3563 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3564 { 3565 struct sctp_association *asoc; 3566 struct sctp_chunkhdr *ch; 3567 struct sctp_stream_reset_request *r; 3568 struct sctp_tmit_chunk *chk; 3569 int len, clen; 3570 3571 asoc = &stcb->asoc; 3572 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3573 asoc->stream_reset_outstanding = 0; 3574 return (NULL); 3575 } 3576 if (stcb->asoc.str_reset == NULL) { 3577 asoc->stream_reset_outstanding = 0; 3578 return (NULL); 3579 } 3580 chk = stcb->asoc.str_reset; 3581 if (chk->data == NULL) { 3582 return (NULL); 3583 } 3584 if (bchk) { 3585 /* he wants a copy of the chk pointer */ 3586 *bchk = chk; 3587 } 3588 clen = chk->send_size; 3589 ch = mtod(chk->data, struct sctp_chunkhdr *); 3590 r = (struct sctp_stream_reset_request *)(ch + 1); 3591 if (ntohl(r->request_seq) == seq) { 3592 /* found it */ 3593 return (r); 3594 } 3595 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3596 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3597 /* move to the next one, there can only be a max of two */ 3598 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3599 if (ntohl(r->request_seq) == seq) { 3600 return (r); 3601 } 3602 } 3603 /* that seq is not here */ 3604 return (NULL); 3605 } 3606 3607 static void 3608 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3609 { 3610 struct sctp_association *asoc; 3611 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3612 3613 if (stcb->asoc.str_reset == NULL) { 3614 return; 3615 } 3616 asoc = &stcb->asoc; 3617 3618 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3619 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3620 TAILQ_REMOVE(&asoc->control_send_queue, 3621 chk, 3622 sctp_next); 3623 if (chk->data) { 3624 sctp_m_freem(chk->data); 3625 chk->data = NULL; 3626 } 3627 asoc->ctrl_queue_cnt--; 3628 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3629 /* sa_ignore NO_NULL_CHK */ 3630 stcb->asoc.str_reset = NULL; 3631 } 3632 3633 3634 static int 3635 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3636 uint32_t seq, uint32_t action, 3637 struct sctp_stream_reset_response *respin) 3638 { 3639 uint16_t type; 3640 int lparam_len; 3641 struct sctp_association *asoc = &stcb->asoc; 3642 struct sctp_tmit_chunk *chk; 3643 struct sctp_stream_reset_request *req_param; 3644 struct sctp_stream_reset_out_request *req_out_param; 3645 struct sctp_stream_reset_in_request *req_in_param; 3646 uint32_t number_entries; 3647 3648 if (asoc->stream_reset_outstanding == 0) { 3649 /* duplicate */ 3650 return (0); 3651 } 3652 if (seq == stcb->asoc.str_reset_seq_out) { 3653 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3654 if (req_param != NULL) { 3655 stcb->asoc.str_reset_seq_out++; 3656 type = ntohs(req_param->ph.param_type); 3657 lparam_len = ntohs(req_param->ph.param_length); 3658 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3659 int no_clear = 0; 3660 3661 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3662 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3663 asoc->stream_reset_out_is_outstanding = 0; 3664 if (asoc->stream_reset_outstanding) 3665 asoc->stream_reset_outstanding--; 3666 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3667 /* do it */ 3668 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3669 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3670 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3671 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3672 /* 3673 * Set it up so we don't stop 3674 * retransmitting 3675 */ 3676 asoc->stream_reset_outstanding++; 3677 stcb->asoc.str_reset_seq_out--; 3678 asoc->stream_reset_out_is_outstanding = 1; 3679 no_clear = 1; 3680 } else { 3681 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3682 } 3683 if (no_clear == 0) { 3684 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3685 } 3686 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3687 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3688 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3689 if (asoc->stream_reset_outstanding) 3690 asoc->stream_reset_outstanding--; 3691 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3692 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3693 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3694 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3695 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3696 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3697 } 3698 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3699 /* Ok we now may have more streams */ 3700 int num_stream; 3701 3702 num_stream = stcb->asoc.strm_pending_add_size; 3703 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3704 /* TSNH */ 3705 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3706 } 3707 stcb->asoc.strm_pending_add_size = 0; 3708 if (asoc->stream_reset_outstanding) 3709 asoc->stream_reset_outstanding--; 3710 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3711 /* Put the new streams into effect */ 3712 int i; 3713 3714 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3715 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3716 } 3717 asoc->streamoutcnt += num_stream; 3718 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3719 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3720 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3721 SCTP_STREAM_CHANGE_DENIED); 3722 } else { 3723 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3724 SCTP_STREAM_CHANGE_FAILED); 3725 } 3726 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3727 if (asoc->stream_reset_outstanding) 3728 asoc->stream_reset_outstanding--; 3729 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3730 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3731 SCTP_STREAM_CHANGE_DENIED); 3732 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3733 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3734 SCTP_STREAM_CHANGE_FAILED); 3735 } 3736 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3737 /** 3738 * a) Adopt the new in tsn. 3739 * b) reset the map 3740 * c) Adopt the new out-tsn 3741 */ 3742 struct sctp_stream_reset_response_tsn *resp; 3743 struct sctp_forward_tsn_chunk fwdtsn; 3744 int abort_flag = 0; 3745 3746 if (respin == NULL) { 3747 /* huh ? */ 3748 return (0); 3749 } 3750 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3751 return (0); 3752 } 3753 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3754 resp = (struct sctp_stream_reset_response_tsn *)respin; 3755 asoc->stream_reset_outstanding--; 3756 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3757 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3758 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3759 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3760 if (abort_flag) { 3761 return (1); 3762 } 3763 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3764 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3765 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3766 } 3767 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3768 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3769 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3770 3771 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3772 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3773 3774 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3775 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3776 3777 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3778 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3779 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3780 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3781 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3782 SCTP_ASSOC_RESET_DENIED); 3783 } else { 3784 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3785 SCTP_ASSOC_RESET_FAILED); 3786 } 3787 } 3788 /* get rid of the request and get the request flags */ 3789 if (asoc->stream_reset_outstanding == 0) { 3790 sctp_clean_up_stream_reset(stcb); 3791 } 3792 } 3793 } 3794 if (asoc->stream_reset_outstanding == 0) { 3795 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3796 } 3797 return (0); 3798 } 3799 3800 static void 3801 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3802 struct sctp_tmit_chunk *chk, 3803 struct sctp_stream_reset_in_request *req, int trunc) 3804 { 3805 uint32_t seq; 3806 int len, i; 3807 int number_entries; 3808 uint16_t temp; 3809 3810 /* 3811 * peer wants me to send a str-reset to him for my outgoing seq's if 3812 * seq_in is right. 3813 */ 3814 struct sctp_association *asoc = &stcb->asoc; 3815 3816 seq = ntohl(req->request_seq); 3817 if (asoc->str_reset_seq_in == seq) { 3818 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3819 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3820 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3821 } else if (trunc) { 3822 /* Can't do it, since they exceeded our buffer size */ 3823 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3824 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3825 len = ntohs(req->ph.param_length); 3826 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3827 if (number_entries) { 3828 for (i = 0; i < number_entries; i++) { 3829 temp = ntohs(req->list_of_streams[i]); 3830 if (temp >= stcb->asoc.streamoutcnt) { 3831 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3832 goto bad_boy; 3833 } 3834 req->list_of_streams[i] = temp; 3835 } 3836 for (i = 0; i < number_entries; i++) { 3837 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3838 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3839 } 3840 } 3841 } else { 3842 /* Its all */ 3843 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3844 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3845 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3846 } 3847 } 3848 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3849 } else { 3850 /* Can't do it, since we have sent one out */ 3851 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3852 } 3853 bad_boy: 3854 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3855 asoc->str_reset_seq_in++; 3856 } else if (asoc->str_reset_seq_in - 1 == seq) { 3857 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3858 } else if (asoc->str_reset_seq_in - 2 == seq) { 3859 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3860 } else { 3861 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3862 } 3863 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3864 } 3865 3866 static int 3867 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3868 struct sctp_tmit_chunk *chk, 3869 struct sctp_stream_reset_tsn_request *req) 3870 { 3871 /* reset all in and out and update the tsn */ 3872 /* 3873 * A) reset my str-seq's on in and out. B) Select a receive next, 3874 * and set cum-ack to it. Also process this selected number as a 3875 * fwd-tsn as well. C) set in the response my next sending seq. 3876 */ 3877 struct sctp_forward_tsn_chunk fwdtsn; 3878 struct sctp_association *asoc = &stcb->asoc; 3879 int abort_flag = 0; 3880 uint32_t seq; 3881 3882 seq = ntohl(req->request_seq); 3883 if (asoc->str_reset_seq_in == seq) { 3884 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3885 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3886 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3887 } else { 3888 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3889 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3890 fwdtsn.ch.chunk_flags = 0; 3891 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3892 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3893 if (abort_flag) { 3894 return (1); 3895 } 3896 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3897 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3898 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3899 } 3900 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3901 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3902 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3903 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3904 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3905 atomic_add_int(&asoc->sending_seq, 1); 3906 /* save off historical data for retrans */ 3907 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3908 asoc->last_sending_seq[0] = asoc->sending_seq; 3909 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3910 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3911 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3912 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3913 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3914 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3915 } 3916 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3917 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3918 asoc->str_reset_seq_in++; 3919 } else if (asoc->str_reset_seq_in - 1 == seq) { 3920 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3921 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3922 } else if (asoc->str_reset_seq_in - 2 == seq) { 3923 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3924 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3925 } else { 3926 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3927 } 3928 return (0); 3929 } 3930 3931 static void 3932 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3933 struct sctp_tmit_chunk *chk, 3934 struct sctp_stream_reset_out_request *req, int trunc) 3935 { 3936 uint32_t seq, tsn; 3937 int number_entries, len; 3938 struct sctp_association *asoc = &stcb->asoc; 3939 3940 seq = ntohl(req->request_seq); 3941 3942 /* now if its not a duplicate we process it */ 3943 if (asoc->str_reset_seq_in == seq) { 3944 len = ntohs(req->ph.param_length); 3945 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3946 /* 3947 * the sender is resetting, handle the list issue.. we must 3948 * a) verify if we can do the reset, if so no problem b) If 3949 * we can't do the reset we must copy the request. c) queue 3950 * it, and setup the data in processor to trigger it off 3951 * when needed and dequeue all the queued data. 3952 */ 3953 tsn = ntohl(req->send_reset_at_tsn); 3954 3955 /* move the reset action back one */ 3956 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3957 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3958 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3959 } else if (trunc) { 3960 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3961 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3962 /* we can do it now */ 3963 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3964 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3965 } else { 3966 /* 3967 * we must queue it up and thus wait for the TSN's 3968 * to arrive that are at or before tsn 3969 */ 3970 struct sctp_stream_reset_list *liste; 3971 int siz; 3972 3973 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3974 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3975 siz, SCTP_M_STRESET); 3976 if (liste == NULL) { 3977 /* gak out of memory */ 3978 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3979 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3980 return; 3981 } 3982 liste->seq = seq; 3983 liste->tsn = tsn; 3984 liste->number_entries = number_entries; 3985 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3986 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3987 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3988 } 3989 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3990 asoc->str_reset_seq_in++; 3991 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3992 /* 3993 * one seq back, just echo back last action since my 3994 * response was lost. 3995 */ 3996 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3997 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3998 /* 3999 * two seq back, just echo back last action since my 4000 * response was lost. 4001 */ 4002 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4003 } else { 4004 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4005 } 4006 } 4007 4008 static void 4009 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4010 struct sctp_stream_reset_add_strm *str_add) 4011 { 4012 /* 4013 * Peer is requesting to add more streams. If its within our 4014 * max-streams we will allow it. 4015 */ 4016 uint32_t num_stream, i; 4017 uint32_t seq; 4018 struct sctp_association *asoc = &stcb->asoc; 4019 struct sctp_queued_to_read *ctl, *nctl; 4020 4021 /* Get the number. */ 4022 seq = ntohl(str_add->request_seq); 4023 num_stream = ntohs(str_add->number_of_streams); 4024 /* Now what would be the new total? */ 4025 if (asoc->str_reset_seq_in == seq) { 4026 num_stream += stcb->asoc.streamincnt; 4027 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4028 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4029 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4030 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4031 (num_stream > 0xffff)) { 4032 /* We must reject it they ask for to many */ 4033 denied: 4034 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4035 } else { 4036 /* Ok, we can do that :-) */ 4037 struct sctp_stream_in *oldstrm; 4038 4039 /* save off the old */ 4040 oldstrm = stcb->asoc.strmin; 4041 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4042 (num_stream * sizeof(struct sctp_stream_in)), 4043 SCTP_M_STRMI); 4044 if (stcb->asoc.strmin == NULL) { 4045 stcb->asoc.strmin = oldstrm; 4046 goto denied; 4047 } 4048 /* copy off the old data */ 4049 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4050 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4051 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4052 stcb->asoc.strmin[i].sid = i; 4053 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4054 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4055 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4056 /* now anything on those queues? */ 4057 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4058 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4059 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4060 } 4061 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4062 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4063 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4064 } 4065 } 4066 /* Init the new streams */ 4067 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4068 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4069 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4070 stcb->asoc.strmin[i].sid = i; 4071 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4072 stcb->asoc.strmin[i].pd_api_started = 0; 4073 stcb->asoc.strmin[i].delivery_started = 0; 4074 } 4075 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4076 /* update the size */ 4077 stcb->asoc.streamincnt = num_stream; 4078 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4079 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4080 } 4081 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4082 asoc->str_reset_seq_in++; 4083 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4084 /* 4085 * one seq back, just echo back last action since my 4086 * response was lost. 4087 */ 4088 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4089 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4090 /* 4091 * two seq back, just echo back last action since my 4092 * response was lost. 4093 */ 4094 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4095 } else { 4096 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4097 4098 } 4099 } 4100 4101 static void 4102 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4103 struct sctp_stream_reset_add_strm *str_add) 4104 { 4105 /* 4106 * Peer is requesting to add more streams. If its within our 4107 * max-streams we will allow it. 4108 */ 4109 uint16_t num_stream; 4110 uint32_t seq; 4111 struct sctp_association *asoc = &stcb->asoc; 4112 4113 /* Get the number. */ 4114 seq = ntohl(str_add->request_seq); 4115 num_stream = ntohs(str_add->number_of_streams); 4116 /* Now what would be the new total? */ 4117 if (asoc->str_reset_seq_in == seq) { 4118 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4119 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4120 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4121 } else if (stcb->asoc.stream_reset_outstanding) { 4122 /* We must reject it we have something pending */ 4123 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4124 } else { 4125 /* Ok, we can do that :-) */ 4126 int mychk; 4127 4128 mychk = stcb->asoc.streamoutcnt; 4129 mychk += num_stream; 4130 if (mychk < 0x10000) { 4131 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4132 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4133 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4134 } 4135 } else { 4136 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4137 } 4138 } 4139 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4140 asoc->str_reset_seq_in++; 4141 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4142 /* 4143 * one seq back, just echo back last action since my 4144 * response was lost. 4145 */ 4146 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4147 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4148 /* 4149 * two seq back, just echo back last action since my 4150 * response was lost. 4151 */ 4152 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4153 } else { 4154 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4155 } 4156 } 4157 4158 #ifdef __GNUC__ 4159 __attribute__((noinline)) 4160 #endif 4161 static int 4162 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4163 struct sctp_chunkhdr *ch_req) 4164 { 4165 uint16_t remaining_length, param_len, ptype; 4166 struct sctp_paramhdr pstore; 4167 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4168 uint32_t seq = 0; 4169 int num_req = 0; 4170 int trunc = 0; 4171 struct sctp_tmit_chunk *chk; 4172 struct sctp_chunkhdr *ch; 4173 struct sctp_paramhdr *ph; 4174 int ret_code = 0; 4175 int num_param = 0; 4176 4177 /* now it may be a reset or a reset-response */ 4178 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4179 4180 /* setup for adding the response */ 4181 sctp_alloc_a_chunk(stcb, chk); 4182 if (chk == NULL) { 4183 return (ret_code); 4184 } 4185 chk->copy_by_ref = 0; 4186 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4187 chk->rec.chunk_id.can_take_data = 0; 4188 chk->flags = 0; 4189 chk->asoc = &stcb->asoc; 4190 chk->no_fr_allowed = 0; 4191 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4192 chk->book_size_scale = 0; 4193 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4194 if (chk->data == NULL) { 4195 strres_nochunk: 4196 if (chk->data) { 4197 sctp_m_freem(chk->data); 4198 chk->data = NULL; 4199 } 4200 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4201 return (ret_code); 4202 } 4203 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4204 4205 /* setup chunk parameters */ 4206 chk->sent = SCTP_DATAGRAM_UNSENT; 4207 chk->snd_count = 0; 4208 chk->whoTo = NULL; 4209 4210 ch = mtod(chk->data, struct sctp_chunkhdr *); 4211 ch->chunk_type = SCTP_STREAM_RESET; 4212 ch->chunk_flags = 0; 4213 ch->chunk_length = htons(chk->send_size); 4214 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4215 offset += sizeof(struct sctp_chunkhdr); 4216 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4217 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4218 if (ph == NULL) { 4219 /* TSNH */ 4220 break; 4221 } 4222 param_len = ntohs(ph->param_length); 4223 if ((param_len > remaining_length) || 4224 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4225 /* bad parameter length */ 4226 break; 4227 } 4228 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4229 (uint8_t *)&cstore); 4230 if (ph == NULL) { 4231 /* TSNH */ 4232 break; 4233 } 4234 ptype = ntohs(ph->param_type); 4235 num_param++; 4236 if (param_len > sizeof(cstore)) { 4237 trunc = 1; 4238 } else { 4239 trunc = 0; 4240 } 4241 if (num_param > SCTP_MAX_RESET_PARAMS) { 4242 /* hit the max of parameters already sorry.. */ 4243 break; 4244 } 4245 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4246 struct sctp_stream_reset_out_request *req_out; 4247 4248 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4249 break; 4250 } 4251 req_out = (struct sctp_stream_reset_out_request *)ph; 4252 num_req++; 4253 if (stcb->asoc.stream_reset_outstanding) { 4254 seq = ntohl(req_out->response_seq); 4255 if (seq == stcb->asoc.str_reset_seq_out) { 4256 /* implicit ack */ 4257 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4258 } 4259 } 4260 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4261 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4262 struct sctp_stream_reset_add_strm *str_add; 4263 4264 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4265 break; 4266 } 4267 str_add = (struct sctp_stream_reset_add_strm *)ph; 4268 num_req++; 4269 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4270 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4271 struct sctp_stream_reset_add_strm *str_add; 4272 4273 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4274 break; 4275 } 4276 str_add = (struct sctp_stream_reset_add_strm *)ph; 4277 num_req++; 4278 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4279 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4280 struct sctp_stream_reset_in_request *req_in; 4281 4282 num_req++; 4283 req_in = (struct sctp_stream_reset_in_request *)ph; 4284 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4285 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4286 struct sctp_stream_reset_tsn_request *req_tsn; 4287 4288 num_req++; 4289 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4290 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4291 ret_code = 1; 4292 goto strres_nochunk; 4293 } 4294 /* no more */ 4295 break; 4296 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4297 struct sctp_stream_reset_response *resp; 4298 uint32_t result; 4299 4300 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4301 break; 4302 } 4303 resp = (struct sctp_stream_reset_response *)ph; 4304 seq = ntohl(resp->response_seq); 4305 result = ntohl(resp->result); 4306 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4307 ret_code = 1; 4308 goto strres_nochunk; 4309 } 4310 } else { 4311 break; 4312 } 4313 offset += SCTP_SIZE32(param_len); 4314 if (remaining_length >= SCTP_SIZE32(param_len)) { 4315 remaining_length -= SCTP_SIZE32(param_len); 4316 } else { 4317 remaining_length = 0; 4318 } 4319 } 4320 if (num_req == 0) { 4321 /* we have no response free the stuff */ 4322 goto strres_nochunk; 4323 } 4324 /* ok we have a chunk to link in */ 4325 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4326 chk, 4327 sctp_next); 4328 stcb->asoc.ctrl_queue_cnt++; 4329 return (ret_code); 4330 } 4331 4332 /* 4333 * Handle a router or endpoints report of a packet loss, there are two ways 4334 * to handle this, either we get the whole packet and must disect it 4335 * ourselves (possibly with truncation and or corruption) or it is a summary 4336 * from a middle box that did the disectting for us. 4337 */ 4338 static void 4339 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4340 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4341 { 4342 uint32_t bottle_bw, on_queue; 4343 uint16_t trunc_len; 4344 unsigned int chlen; 4345 unsigned int at; 4346 struct sctp_chunk_desc desc; 4347 struct sctp_chunkhdr *ch; 4348 4349 chlen = ntohs(cp->ch.chunk_length); 4350 chlen -= sizeof(struct sctp_pktdrop_chunk); 4351 /* XXX possible chlen underflow */ 4352 if (chlen == 0) { 4353 ch = NULL; 4354 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4355 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4356 } else { 4357 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4358 chlen -= sizeof(struct sctphdr); 4359 /* XXX possible chlen underflow */ 4360 memset(&desc, 0, sizeof(desc)); 4361 } 4362 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4363 if (trunc_len > limit) { 4364 trunc_len = limit; 4365 } 4366 /* now the chunks themselves */ 4367 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4368 desc.chunk_type = ch->chunk_type; 4369 /* get amount we need to move */ 4370 at = ntohs(ch->chunk_length); 4371 if (at < sizeof(struct sctp_chunkhdr)) { 4372 /* corrupt chunk, maybe at the end? */ 4373 SCTP_STAT_INCR(sctps_pdrpcrupt); 4374 break; 4375 } 4376 if (trunc_len == 0) { 4377 /* we are supposed to have all of it */ 4378 if (at > chlen) { 4379 /* corrupt skip it */ 4380 SCTP_STAT_INCR(sctps_pdrpcrupt); 4381 break; 4382 } 4383 } else { 4384 /* is there enough of it left ? */ 4385 if (desc.chunk_type == SCTP_DATA) { 4386 if (chlen < (sizeof(struct sctp_data_chunk) + 4387 sizeof(desc.data_bytes))) { 4388 break; 4389 } 4390 } else { 4391 if (chlen < sizeof(struct sctp_chunkhdr)) { 4392 break; 4393 } 4394 } 4395 } 4396 if (desc.chunk_type == SCTP_DATA) { 4397 /* can we get out the tsn? */ 4398 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4399 SCTP_STAT_INCR(sctps_pdrpmbda); 4400 4401 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4402 /* yep */ 4403 struct sctp_data_chunk *dcp; 4404 uint8_t *ddp; 4405 unsigned int iii; 4406 4407 dcp = (struct sctp_data_chunk *)ch; 4408 ddp = (uint8_t *)(dcp + 1); 4409 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4410 desc.data_bytes[iii] = ddp[iii]; 4411 } 4412 desc.tsn_ifany = dcp->dp.tsn; 4413 } else { 4414 /* nope we are done. */ 4415 SCTP_STAT_INCR(sctps_pdrpnedat); 4416 break; 4417 } 4418 } else { 4419 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4420 SCTP_STAT_INCR(sctps_pdrpmbct); 4421 } 4422 4423 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4424 SCTP_STAT_INCR(sctps_pdrppdbrk); 4425 break; 4426 } 4427 if (SCTP_SIZE32(at) > chlen) { 4428 break; 4429 } 4430 chlen -= SCTP_SIZE32(at); 4431 if (chlen < sizeof(struct sctp_chunkhdr)) { 4432 /* done, none left */ 4433 break; 4434 } 4435 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4436 } 4437 /* Now update any rwnd --- possibly */ 4438 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4439 /* From a peer, we get a rwnd report */ 4440 uint32_t a_rwnd; 4441 4442 SCTP_STAT_INCR(sctps_pdrpfehos); 4443 4444 bottle_bw = ntohl(cp->bottle_bw); 4445 on_queue = ntohl(cp->current_onq); 4446 if (bottle_bw && on_queue) { 4447 /* a rwnd report is in here */ 4448 if (bottle_bw > on_queue) 4449 a_rwnd = bottle_bw - on_queue; 4450 else 4451 a_rwnd = 0; 4452 4453 if (a_rwnd == 0) 4454 stcb->asoc.peers_rwnd = 0; 4455 else { 4456 if (a_rwnd > stcb->asoc.total_flight) { 4457 stcb->asoc.peers_rwnd = 4458 a_rwnd - stcb->asoc.total_flight; 4459 } else { 4460 stcb->asoc.peers_rwnd = 0; 4461 } 4462 if (stcb->asoc.peers_rwnd < 4463 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4464 /* SWS sender side engages */ 4465 stcb->asoc.peers_rwnd = 0; 4466 } 4467 } 4468 } 4469 } else { 4470 SCTP_STAT_INCR(sctps_pdrpfmbox); 4471 } 4472 4473 /* now middle boxes in sat networks get a cwnd bump */ 4474 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4475 (stcb->asoc.sat_t3_loss_recovery == 0) && 4476 (stcb->asoc.sat_network)) { 4477 /* 4478 * This is debatable but for sat networks it makes sense 4479 * Note if a T3 timer has went off, we will prohibit any 4480 * changes to cwnd until we exit the t3 loss recovery. 4481 */ 4482 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4483 net, cp, &bottle_bw, &on_queue); 4484 } 4485 } 4486 4487 /* 4488 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4489 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4490 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4491 * length of the complete packet outputs: - length: modified to remaining 4492 * length after control processing - netp: modified to new sctp_nets after 4493 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4494 * bad packet,...) otherwise return the tcb for this packet 4495 */ 4496 #ifdef __GNUC__ 4497 __attribute__((noinline)) 4498 #endif 4499 static struct sctp_tcb * 4500 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4501 struct sockaddr *src, struct sockaddr *dst, 4502 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4503 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4504 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4505 uint32_t vrf_id, uint16_t port) 4506 { 4507 struct sctp_association *asoc; 4508 struct mbuf *op_err; 4509 char msg[SCTP_DIAG_INFO_LEN]; 4510 uint32_t vtag_in; 4511 int num_chunks = 0; /* number of control chunks processed */ 4512 uint32_t chk_length; 4513 int ret; 4514 int abort_no_unlock = 0; 4515 int ecne_seen = 0; 4516 4517 /* 4518 * How big should this be, and should it be alloc'd? Lets try the 4519 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4520 * until we get into jumbo grams and such.. 4521 */ 4522 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4523 int got_auth = 0; 4524 uint32_t auth_offset = 0, auth_len = 0; 4525 int auth_skipped = 0; 4526 int asconf_cnt = 0; 4527 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4528 struct socket *so; 4529 #endif 4530 4531 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4532 iphlen, *offset, length, (void *)stcb); 4533 4534 if (stcb) { 4535 SCTP_TCB_LOCK_ASSERT(stcb); 4536 } 4537 /* validate chunk header length... */ 4538 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4539 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4540 ntohs(ch->chunk_length)); 4541 *offset = length; 4542 return (stcb); 4543 } 4544 /* 4545 * validate the verification tag 4546 */ 4547 vtag_in = ntohl(sh->v_tag); 4548 4549 if (ch->chunk_type == SCTP_INITIATION) { 4550 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4551 ntohs(ch->chunk_length), vtag_in); 4552 if (vtag_in != 0) { 4553 /* protocol error- silently discard... */ 4554 SCTP_STAT_INCR(sctps_badvtag); 4555 if (stcb != NULL) { 4556 SCTP_TCB_UNLOCK(stcb); 4557 } 4558 return (NULL); 4559 } 4560 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4561 /* 4562 * If there is no stcb, skip the AUTH chunk and process 4563 * later after a stcb is found (to validate the lookup was 4564 * valid. 4565 */ 4566 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4567 (stcb == NULL) && 4568 (inp->auth_supported == 1)) { 4569 /* save this chunk for later processing */ 4570 auth_skipped = 1; 4571 auth_offset = *offset; 4572 auth_len = ntohs(ch->chunk_length); 4573 4574 /* (temporarily) move past this chunk */ 4575 *offset += SCTP_SIZE32(auth_len); 4576 if (*offset >= length) { 4577 /* no more data left in the mbuf chain */ 4578 *offset = length; 4579 return (NULL); 4580 } 4581 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4582 sizeof(struct sctp_chunkhdr), chunk_buf); 4583 } 4584 if (ch == NULL) { 4585 /* Help */ 4586 *offset = length; 4587 return (stcb); 4588 } 4589 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4590 goto process_control_chunks; 4591 } 4592 /* 4593 * first check if it's an ASCONF with an unknown src addr we 4594 * need to look inside to find the association 4595 */ 4596 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4597 struct sctp_chunkhdr *asconf_ch = ch; 4598 uint32_t asconf_offset = 0, asconf_len = 0; 4599 4600 /* inp's refcount may be reduced */ 4601 SCTP_INP_INCR_REF(inp); 4602 4603 asconf_offset = *offset; 4604 do { 4605 asconf_len = ntohs(asconf_ch->chunk_length); 4606 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4607 break; 4608 stcb = sctp_findassociation_ep_asconf(m, 4609 *offset, 4610 dst, 4611 sh, &inp, netp, vrf_id); 4612 if (stcb != NULL) 4613 break; 4614 asconf_offset += SCTP_SIZE32(asconf_len); 4615 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4616 sizeof(struct sctp_chunkhdr), chunk_buf); 4617 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4618 if (stcb == NULL) { 4619 /* 4620 * reduce inp's refcount if not reduced in 4621 * sctp_findassociation_ep_asconf(). 4622 */ 4623 SCTP_INP_DECR_REF(inp); 4624 } 4625 /* now go back and verify any auth chunk to be sure */ 4626 if (auth_skipped && (stcb != NULL)) { 4627 struct sctp_auth_chunk *auth; 4628 4629 auth = (struct sctp_auth_chunk *) 4630 sctp_m_getptr(m, auth_offset, 4631 auth_len, chunk_buf); 4632 got_auth = 1; 4633 auth_skipped = 0; 4634 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4635 auth_offset)) { 4636 /* auth HMAC failed so dump it */ 4637 *offset = length; 4638 return (stcb); 4639 } else { 4640 /* remaining chunks are HMAC checked */ 4641 stcb->asoc.authenticated = 1; 4642 } 4643 } 4644 } 4645 if (stcb == NULL) { 4646 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4647 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4648 msg); 4649 /* no association, so it's out of the blue... */ 4650 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4651 mflowtype, mflowid, inp->fibnum, 4652 vrf_id, port); 4653 *offset = length; 4654 return (NULL); 4655 } 4656 asoc = &stcb->asoc; 4657 /* ABORT and SHUTDOWN can use either v_tag... */ 4658 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4659 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4660 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4661 /* Take the T-bit always into account. */ 4662 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4663 (vtag_in == asoc->my_vtag)) || 4664 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4665 (asoc->peer_vtag != htonl(0)) && 4666 (vtag_in == asoc->peer_vtag))) { 4667 /* this is valid */ 4668 } else { 4669 /* drop this packet... */ 4670 SCTP_STAT_INCR(sctps_badvtag); 4671 if (stcb != NULL) { 4672 SCTP_TCB_UNLOCK(stcb); 4673 } 4674 return (NULL); 4675 } 4676 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4677 if (vtag_in != asoc->my_vtag) { 4678 /* 4679 * this could be a stale SHUTDOWN-ACK or the 4680 * peer never got the SHUTDOWN-COMPLETE and 4681 * is still hung; we have started a new asoc 4682 * but it won't complete until the shutdown 4683 * is completed 4684 */ 4685 if (stcb != NULL) { 4686 SCTP_TCB_UNLOCK(stcb); 4687 } 4688 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4689 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4690 msg); 4691 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4692 sh, inp, op_err, 4693 mflowtype, mflowid, fibnum, 4694 vrf_id, port); 4695 return (NULL); 4696 } 4697 } else { 4698 /* for all other chunks, vtag must match */ 4699 if (vtag_in != asoc->my_vtag) { 4700 /* invalid vtag... */ 4701 SCTPDBG(SCTP_DEBUG_INPUT3, 4702 "invalid vtag: %xh, expect %xh\n", 4703 vtag_in, asoc->my_vtag); 4704 SCTP_STAT_INCR(sctps_badvtag); 4705 if (stcb != NULL) { 4706 SCTP_TCB_UNLOCK(stcb); 4707 } 4708 *offset = length; 4709 return (NULL); 4710 } 4711 } 4712 } /* end if !SCTP_COOKIE_ECHO */ 4713 /* 4714 * process all control chunks... 4715 */ 4716 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4717 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4718 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4719 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4720 /* implied cookie-ack.. we must have lost the ack */ 4721 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4722 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4723 stcb->asoc.overall_error_count, 4724 0, 4725 SCTP_FROM_SCTP_INPUT, 4726 __LINE__); 4727 } 4728 stcb->asoc.overall_error_count = 0; 4729 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4730 *netp); 4731 } 4732 process_control_chunks: 4733 while (IS_SCTP_CONTROL(ch)) { 4734 /* validate chunk length */ 4735 chk_length = ntohs(ch->chunk_length); 4736 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4737 ch->chunk_type, chk_length); 4738 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4739 if (chk_length < sizeof(*ch) || 4740 (*offset + (int)chk_length) > length) { 4741 *offset = length; 4742 return (stcb); 4743 } 4744 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4745 /* 4746 * INIT-ACK only gets the init ack "header" portion only 4747 * because we don't have to process the peer's COOKIE. All 4748 * others get a complete chunk. 4749 */ 4750 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4751 (ch->chunk_type == SCTP_INITIATION)) { 4752 /* get an init-ack chunk */ 4753 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4754 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4755 if (ch == NULL) { 4756 *offset = length; 4757 if (stcb != NULL) { 4758 SCTP_TCB_UNLOCK(stcb); 4759 } 4760 return (NULL); 4761 } 4762 } else { 4763 /* For cookies and all other chunks. */ 4764 if (chk_length > sizeof(chunk_buf)) { 4765 /* 4766 * use just the size of the chunk buffer so 4767 * the front part of our chunks fit in 4768 * contiguous space up to the chunk buffer 4769 * size (508 bytes). For chunks that need to 4770 * get more than that they must use the 4771 * sctp_m_getptr() function or other means 4772 * (e.g. know how to parse mbuf chains). 4773 * Cookies do this already. 4774 */ 4775 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4776 (sizeof(chunk_buf) - 4), 4777 chunk_buf); 4778 if (ch == NULL) { 4779 *offset = length; 4780 if (stcb != NULL) { 4781 SCTP_TCB_UNLOCK(stcb); 4782 } 4783 return (NULL); 4784 } 4785 } else { 4786 /* We can fit it all */ 4787 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4788 chk_length, chunk_buf); 4789 if (ch == NULL) { 4790 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4791 *offset = length; 4792 if (stcb != NULL) { 4793 SCTP_TCB_UNLOCK(stcb); 4794 } 4795 return (NULL); 4796 } 4797 } 4798 } 4799 num_chunks++; 4800 /* Save off the last place we got a control from */ 4801 if (stcb != NULL) { 4802 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4803 /* 4804 * allow last_control to be NULL if 4805 * ASCONF... ASCONF processing will find the 4806 * right net later 4807 */ 4808 if ((netp != NULL) && (*netp != NULL)) 4809 stcb->asoc.last_control_chunk_from = *netp; 4810 } 4811 } 4812 #ifdef SCTP_AUDITING_ENABLED 4813 sctp_audit_log(0xB0, ch->chunk_type); 4814 #endif 4815 4816 /* check to see if this chunk required auth, but isn't */ 4817 if ((stcb != NULL) && 4818 (stcb->asoc.auth_supported == 1) && 4819 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4820 !stcb->asoc.authenticated) { 4821 /* "silently" ignore */ 4822 SCTP_STAT_INCR(sctps_recvauthmissing); 4823 goto next_chunk; 4824 } 4825 switch (ch->chunk_type) { 4826 case SCTP_INITIATION: 4827 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4828 /* The INIT chunk must be the only chunk. */ 4829 if ((num_chunks > 1) || 4830 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4831 /* RFC 4960 requires that no ABORT is sent */ 4832 *offset = length; 4833 if (stcb != NULL) { 4834 SCTP_TCB_UNLOCK(stcb); 4835 } 4836 return (NULL); 4837 } 4838 /* Honor our resource limit. */ 4839 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4840 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4841 sctp_abort_association(inp, stcb, m, iphlen, 4842 src, dst, sh, op_err, 4843 mflowtype, mflowid, 4844 vrf_id, port); 4845 *offset = length; 4846 return (NULL); 4847 } 4848 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4849 (struct sctp_init_chunk *)ch, inp, 4850 stcb, *netp, &abort_no_unlock, 4851 mflowtype, mflowid, 4852 vrf_id, port); 4853 *offset = length; 4854 if ((!abort_no_unlock) && (stcb != NULL)) { 4855 SCTP_TCB_UNLOCK(stcb); 4856 } 4857 return (NULL); 4858 break; 4859 case SCTP_PAD_CHUNK: 4860 break; 4861 case SCTP_INITIATION_ACK: 4862 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4863 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4864 /* We are not interested anymore */ 4865 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4866 ; 4867 } else { 4868 *offset = length; 4869 if (stcb != NULL) { 4870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4871 so = SCTP_INP_SO(inp); 4872 atomic_add_int(&stcb->asoc.refcnt, 1); 4873 SCTP_TCB_UNLOCK(stcb); 4874 SCTP_SOCKET_LOCK(so, 1); 4875 SCTP_TCB_LOCK(stcb); 4876 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4877 #endif 4878 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4879 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4880 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4881 SCTP_SOCKET_UNLOCK(so, 1); 4882 #endif 4883 } 4884 return (NULL); 4885 } 4886 } 4887 /* The INIT-ACK chunk must be the only chunk. */ 4888 if ((num_chunks > 1) || 4889 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4890 *offset = length; 4891 return (stcb); 4892 } 4893 if ((netp) && (*netp)) { 4894 ret = sctp_handle_init_ack(m, iphlen, *offset, 4895 src, dst, sh, 4896 (struct sctp_init_ack_chunk *)ch, 4897 stcb, *netp, 4898 &abort_no_unlock, 4899 mflowtype, mflowid, 4900 vrf_id); 4901 } else { 4902 ret = -1; 4903 } 4904 *offset = length; 4905 if (abort_no_unlock) { 4906 return (NULL); 4907 } 4908 /* 4909 * Special case, I must call the output routine to 4910 * get the cookie echoed 4911 */ 4912 if ((stcb != NULL) && (ret == 0)) { 4913 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4914 } 4915 return (stcb); 4916 break; 4917 case SCTP_SELECTIVE_ACK: 4918 { 4919 struct sctp_sack_chunk *sack; 4920 int abort_now = 0; 4921 uint32_t a_rwnd, cum_ack; 4922 uint16_t num_seg, num_dup; 4923 uint8_t flags; 4924 int offset_seg, offset_dup; 4925 4926 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4927 SCTP_STAT_INCR(sctps_recvsacks); 4928 if (stcb == NULL) { 4929 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4930 break; 4931 } 4932 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4933 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4934 break; 4935 } 4936 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4937 /*- 4938 * If we have sent a shutdown-ack, we will pay no 4939 * attention to a sack sent in to us since 4940 * we don't care anymore. 4941 */ 4942 break; 4943 } 4944 sack = (struct sctp_sack_chunk *)ch; 4945 flags = ch->chunk_flags; 4946 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4947 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4948 num_dup = ntohs(sack->sack.num_dup_tsns); 4949 a_rwnd = (uint32_t)ntohl(sack->sack.a_rwnd); 4950 if (sizeof(struct sctp_sack_chunk) + 4951 num_seg * sizeof(struct sctp_gap_ack_block) + 4952 num_dup * sizeof(uint32_t) != chk_length) { 4953 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4954 break; 4955 } 4956 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4957 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4958 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4959 cum_ack, num_seg, a_rwnd); 4960 stcb->asoc.seen_a_sack_this_pkt = 1; 4961 if ((stcb->asoc.pr_sctp_cnt == 0) && 4962 (num_seg == 0) && 4963 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4964 (stcb->asoc.saw_sack_with_frags == 0) && 4965 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4966 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4967 ) { 4968 /* 4969 * We have a SIMPLE sack having no 4970 * prior segments and data on sent 4971 * queue to be acked.. Use the 4972 * faster path sack processing. We 4973 * also allow window update sacks 4974 * with no missing segments to go 4975 * this way too. 4976 */ 4977 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4978 } else { 4979 if (netp && *netp) 4980 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4981 num_seg, 0, num_dup, &abort_now, flags, 4982 cum_ack, a_rwnd, ecne_seen); 4983 } 4984 if (abort_now) { 4985 /* ABORT signal from sack processing */ 4986 *offset = length; 4987 return (NULL); 4988 } 4989 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4990 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4991 (stcb->asoc.stream_queue_cnt == 0)) { 4992 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4993 } 4994 } 4995 break; 4996 /* 4997 * EY - nr_sack: If the received chunk is an 4998 * nr_sack chunk 4999 */ 5000 case SCTP_NR_SELECTIVE_ACK: 5001 { 5002 struct sctp_nr_sack_chunk *nr_sack; 5003 int abort_now = 0; 5004 uint32_t a_rwnd, cum_ack; 5005 uint16_t num_seg, num_nr_seg, num_dup; 5006 uint8_t flags; 5007 int offset_seg, offset_dup; 5008 5009 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5010 SCTP_STAT_INCR(sctps_recvsacks); 5011 if (stcb == NULL) { 5012 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5013 break; 5014 } 5015 if (stcb->asoc.nrsack_supported == 0) { 5016 goto unknown_chunk; 5017 } 5018 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5019 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5020 break; 5021 } 5022 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5023 /*- 5024 * If we have sent a shutdown-ack, we will pay no 5025 * attention to a sack sent in to us since 5026 * we don't care anymore. 5027 */ 5028 break; 5029 } 5030 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5031 flags = ch->chunk_flags; 5032 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5033 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5034 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5035 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5036 a_rwnd = (uint32_t)ntohl(nr_sack->nr_sack.a_rwnd); 5037 if (sizeof(struct sctp_nr_sack_chunk) + 5038 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5039 num_dup * sizeof(uint32_t) != chk_length) { 5040 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5041 break; 5042 } 5043 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5044 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5045 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5046 cum_ack, num_seg, a_rwnd); 5047 stcb->asoc.seen_a_sack_this_pkt = 1; 5048 if ((stcb->asoc.pr_sctp_cnt == 0) && 5049 (num_seg == 0) && (num_nr_seg == 0) && 5050 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5051 (stcb->asoc.saw_sack_with_frags == 0) && 5052 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5053 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5054 /* 5055 * We have a SIMPLE sack having no 5056 * prior segments and data on sent 5057 * queue to be acked. Use the faster 5058 * path sack processing. We also 5059 * allow window update sacks with no 5060 * missing segments to go this way 5061 * too. 5062 */ 5063 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5064 &abort_now, ecne_seen); 5065 } else { 5066 if (netp && *netp) 5067 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5068 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5069 cum_ack, a_rwnd, ecne_seen); 5070 } 5071 if (abort_now) { 5072 /* ABORT signal from sack processing */ 5073 *offset = length; 5074 return (NULL); 5075 } 5076 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5077 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5078 (stcb->asoc.stream_queue_cnt == 0)) { 5079 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5080 } 5081 } 5082 break; 5083 5084 case SCTP_HEARTBEAT_REQUEST: 5085 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5086 if ((stcb) && netp && *netp) { 5087 SCTP_STAT_INCR(sctps_recvheartbeat); 5088 sctp_send_heartbeat_ack(stcb, m, *offset, 5089 chk_length, *netp); 5090 5091 /* He's alive so give him credit */ 5092 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5093 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5094 stcb->asoc.overall_error_count, 5095 0, 5096 SCTP_FROM_SCTP_INPUT, 5097 __LINE__); 5098 } 5099 stcb->asoc.overall_error_count = 0; 5100 } 5101 break; 5102 case SCTP_HEARTBEAT_ACK: 5103 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5104 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5105 /* Its not ours */ 5106 *offset = length; 5107 return (stcb); 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 *offset = length; 5127 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5128 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5129 return (NULL); 5130 } else { 5131 return (stcb); 5132 } 5133 } else { 5134 return (NULL); 5135 } 5136 break; 5137 case SCTP_SHUTDOWN: 5138 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5139 (void *)stcb); 5140 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5141 *offset = length; 5142 return (stcb); 5143 } 5144 if (netp && *netp) { 5145 int abort_flag = 0; 5146 5147 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5148 stcb, *netp, &abort_flag); 5149 if (abort_flag) { 5150 *offset = length; 5151 return (NULL); 5152 } 5153 } 5154 break; 5155 case SCTP_SHUTDOWN_ACK: 5156 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5157 if ((stcb) && (netp) && (*netp)) 5158 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5159 *offset = length; 5160 return (NULL); 5161 break; 5162 5163 case SCTP_OPERATION_ERROR: 5164 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5165 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5166 *offset = length; 5167 return (NULL); 5168 } 5169 break; 5170 case SCTP_COOKIE_ECHO: 5171 SCTPDBG(SCTP_DEBUG_INPUT3, 5172 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5173 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5174 ; 5175 } else { 5176 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5177 /* We are not interested anymore */ 5178 abend: 5179 if (stcb != NULL) { 5180 SCTP_TCB_UNLOCK(stcb); 5181 } 5182 *offset = length; 5183 return (NULL); 5184 } 5185 } 5186 /*- 5187 * First are we accepting? We do this again here 5188 * since it is possible that a previous endpoint WAS 5189 * listening responded to a INIT-ACK and then 5190 * closed. We opened and bound.. and are now no 5191 * longer listening. 5192 * 5193 * XXXGL: notes on checking listen queue length. 5194 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5195 * SOLISTENING(), because a listening "UDP type" 5196 * socket isn't listening in terms of the socket 5197 * layer. It is a normal data flow socket, that 5198 * can fork off new connections. Thus, we should 5199 * look into sol_qlen only in case we are !UDP. 5200 * 2) Checking sol_qlen in general requires locking 5201 * the socket, and this code lacks that. 5202 */ 5203 if ((stcb == NULL) && 5204 (!SCTP_IS_LISTENING(inp) || 5205 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5206 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5207 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5208 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5209 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5210 sctp_abort_association(inp, stcb, m, iphlen, 5211 src, dst, sh, op_err, 5212 mflowtype, mflowid, 5213 vrf_id, port); 5214 } 5215 *offset = length; 5216 return (NULL); 5217 } else { 5218 struct mbuf *ret_buf; 5219 struct sctp_inpcb *linp; 5220 5221 if (stcb) { 5222 linp = NULL; 5223 } else { 5224 linp = inp; 5225 } 5226 5227 if (linp) { 5228 SCTP_ASOC_CREATE_LOCK(linp); 5229 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5230 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5231 SCTP_ASOC_CREATE_UNLOCK(linp); 5232 goto abend; 5233 } 5234 } 5235 if (netp) { 5236 struct sctp_tcb *locked_stcb; 5237 5238 locked_stcb = stcb; 5239 ret_buf = 5240 sctp_handle_cookie_echo(m, iphlen, 5241 *offset, 5242 src, dst, 5243 sh, 5244 (struct sctp_cookie_echo_chunk *)ch, 5245 &inp, &stcb, netp, 5246 auth_skipped, 5247 auth_offset, 5248 auth_len, 5249 &locked_stcb, 5250 mflowtype, 5251 mflowid, 5252 vrf_id, 5253 port); 5254 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5255 SCTP_TCB_UNLOCK(locked_stcb); 5256 } 5257 if (stcb != NULL) { 5258 SCTP_TCB_LOCK_ASSERT(stcb); 5259 } 5260 } else { 5261 ret_buf = NULL; 5262 } 5263 if (linp) { 5264 SCTP_ASOC_CREATE_UNLOCK(linp); 5265 } 5266 if (ret_buf == NULL) { 5267 if (stcb != NULL) { 5268 SCTP_TCB_UNLOCK(stcb); 5269 } 5270 SCTPDBG(SCTP_DEBUG_INPUT3, 5271 "GAK, null buffer\n"); 5272 *offset = length; 5273 return (NULL); 5274 } 5275 /* if AUTH skipped, see if it verified... */ 5276 if (auth_skipped) { 5277 got_auth = 1; 5278 auth_skipped = 0; 5279 } 5280 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5281 /* 5282 * Restart the timer if we have 5283 * pending data 5284 */ 5285 struct sctp_tmit_chunk *chk; 5286 5287 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5288 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5289 } 5290 } 5291 break; 5292 case SCTP_COOKIE_ACK: 5293 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5294 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5295 return (stcb); 5296 } 5297 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5298 /* We are not interested anymore */ 5299 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5300 ; 5301 } else if (stcb) { 5302 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5303 so = SCTP_INP_SO(inp); 5304 atomic_add_int(&stcb->asoc.refcnt, 1); 5305 SCTP_TCB_UNLOCK(stcb); 5306 SCTP_SOCKET_LOCK(so, 1); 5307 SCTP_TCB_LOCK(stcb); 5308 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5309 #endif 5310 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5311 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5312 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5313 SCTP_SOCKET_UNLOCK(so, 1); 5314 #endif 5315 *offset = length; 5316 return (NULL); 5317 } 5318 } 5319 /* He's alive so give him credit */ 5320 if ((stcb) && netp && *netp) { 5321 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5322 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5323 stcb->asoc.overall_error_count, 5324 0, 5325 SCTP_FROM_SCTP_INPUT, 5326 __LINE__); 5327 } 5328 stcb->asoc.overall_error_count = 0; 5329 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5330 } 5331 break; 5332 case SCTP_ECN_ECHO: 5333 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5334 /* He's alive so give him credit */ 5335 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5336 /* Its not ours */ 5337 *offset = length; 5338 return (stcb); 5339 } 5340 if (stcb) { 5341 if (stcb->asoc.ecn_supported == 0) { 5342 goto unknown_chunk; 5343 } 5344 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5345 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5346 stcb->asoc.overall_error_count, 5347 0, 5348 SCTP_FROM_SCTP_INPUT, 5349 __LINE__); 5350 } 5351 stcb->asoc.overall_error_count = 0; 5352 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5353 stcb); 5354 ecne_seen = 1; 5355 } 5356 break; 5357 case SCTP_ECN_CWR: 5358 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5359 /* He's alive so give him credit */ 5360 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5361 *offset = length; 5362 return (stcb); 5363 } 5364 if (stcb) { 5365 if (stcb->asoc.ecn_supported == 0) { 5366 goto unknown_chunk; 5367 } 5368 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5369 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5370 stcb->asoc.overall_error_count, 5371 0, 5372 SCTP_FROM_SCTP_INPUT, 5373 __LINE__); 5374 } 5375 stcb->asoc.overall_error_count = 0; 5376 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5377 } 5378 break; 5379 case SCTP_SHUTDOWN_COMPLETE: 5380 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5381 /* must be first and only chunk */ 5382 if ((num_chunks > 1) || 5383 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5384 *offset = length; 5385 return (stcb); 5386 } 5387 if ((stcb) && netp && *netp) { 5388 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5389 stcb, *netp); 5390 } 5391 *offset = length; 5392 return (NULL); 5393 break; 5394 case SCTP_ASCONF: 5395 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5396 /* He's alive so give him credit */ 5397 if (stcb) { 5398 if (stcb->asoc.asconf_supported == 0) { 5399 goto unknown_chunk; 5400 } 5401 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5402 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5403 stcb->asoc.overall_error_count, 5404 0, 5405 SCTP_FROM_SCTP_INPUT, 5406 __LINE__); 5407 } 5408 stcb->asoc.overall_error_count = 0; 5409 sctp_handle_asconf(m, *offset, src, 5410 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5411 asconf_cnt++; 5412 } 5413 break; 5414 case SCTP_ASCONF_ACK: 5415 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5416 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5417 /* Its not ours */ 5418 *offset = length; 5419 return (stcb); 5420 } 5421 if ((stcb) && netp && *netp) { 5422 if (stcb->asoc.asconf_supported == 0) { 5423 goto unknown_chunk; 5424 } 5425 /* He's alive so give him credit */ 5426 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5427 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5428 stcb->asoc.overall_error_count, 5429 0, 5430 SCTP_FROM_SCTP_INPUT, 5431 __LINE__); 5432 } 5433 stcb->asoc.overall_error_count = 0; 5434 sctp_handle_asconf_ack(m, *offset, 5435 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5436 if (abort_no_unlock) 5437 return (NULL); 5438 } 5439 break; 5440 case SCTP_FORWARD_CUM_TSN: 5441 case SCTP_IFORWARD_CUM_TSN: 5442 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5443 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5444 /* Its not ours */ 5445 *offset = length; 5446 return (stcb); 5447 } 5448 /* He's alive so give him credit */ 5449 if (stcb) { 5450 int abort_flag = 0; 5451 5452 if (stcb->asoc.prsctp_supported == 0) { 5453 goto unknown_chunk; 5454 } 5455 stcb->asoc.overall_error_count = 0; 5456 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5457 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5458 stcb->asoc.overall_error_count, 5459 0, 5460 SCTP_FROM_SCTP_INPUT, 5461 __LINE__); 5462 } 5463 *fwd_tsn_seen = 1; 5464 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5465 /* We are not interested anymore */ 5466 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5467 so = SCTP_INP_SO(inp); 5468 atomic_add_int(&stcb->asoc.refcnt, 1); 5469 SCTP_TCB_UNLOCK(stcb); 5470 SCTP_SOCKET_LOCK(so, 1); 5471 SCTP_TCB_LOCK(stcb); 5472 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5473 #endif 5474 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5475 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5476 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5477 SCTP_SOCKET_UNLOCK(so, 1); 5478 #endif 5479 *offset = length; 5480 return (NULL); 5481 } 5482 /* 5483 * For sending a SACK this looks like DATA 5484 * chunks. 5485 */ 5486 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5487 sctp_handle_forward_tsn(stcb, 5488 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5489 if (abort_flag) { 5490 *offset = length; 5491 return (NULL); 5492 } else { 5493 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5494 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5495 stcb->asoc.overall_error_count, 5496 0, 5497 SCTP_FROM_SCTP_INPUT, 5498 __LINE__); 5499 } 5500 stcb->asoc.overall_error_count = 0; 5501 } 5502 5503 } 5504 break; 5505 case SCTP_STREAM_RESET: 5506 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5507 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5508 /* Its not ours */ 5509 *offset = length; 5510 return (stcb); 5511 } 5512 if (stcb->asoc.reconfig_supported == 0) { 5513 goto unknown_chunk; 5514 } 5515 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5516 /* stop processing */ 5517 *offset = length; 5518 return (NULL); 5519 } 5520 break; 5521 case SCTP_PACKET_DROPPED: 5522 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5523 /* re-get it all please */ 5524 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5525 /* Its not ours */ 5526 *offset = length; 5527 return (stcb); 5528 } 5529 if (ch && (stcb) && netp && (*netp)) { 5530 if (stcb->asoc.pktdrop_supported == 0) { 5531 goto unknown_chunk; 5532 } 5533 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5534 stcb, *netp, 5535 min(chk_length, (sizeof(chunk_buf) - 4))); 5536 } 5537 break; 5538 case SCTP_AUTHENTICATION: 5539 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5540 if (stcb == NULL) { 5541 /* save the first AUTH for later processing */ 5542 if (auth_skipped == 0) { 5543 auth_offset = *offset; 5544 auth_len = chk_length; 5545 auth_skipped = 1; 5546 } 5547 /* skip this chunk (temporarily) */ 5548 goto next_chunk; 5549 } 5550 if (stcb->asoc.auth_supported == 0) { 5551 goto unknown_chunk; 5552 } 5553 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5554 (chk_length > (sizeof(struct sctp_auth_chunk) + 5555 SCTP_AUTH_DIGEST_LEN_MAX))) { 5556 /* Its not ours */ 5557 *offset = length; 5558 return (stcb); 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((uint16_t)(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 5613 next_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 *offset = length; 5624 return (stcb); 5625 } 5626 } /* while */ 5627 5628 if (asconf_cnt > 0 && stcb != NULL) { 5629 sctp_send_asconf_ack(stcb); 5630 } 5631 return (stcb); 5632 } 5633 5634 5635 /* 5636 * common input chunk processing (v4 and v6) 5637 */ 5638 void 5639 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5640 struct sockaddr *src, struct sockaddr *dst, 5641 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5642 #if !defined(SCTP_WITH_NO_CSUM) 5643 uint8_t compute_crc, 5644 #endif 5645 uint8_t ecn_bits, 5646 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5647 uint32_t vrf_id, uint16_t port) 5648 { 5649 uint32_t high_tsn; 5650 int fwd_tsn_seen = 0, data_processed = 0; 5651 struct mbuf *m = *mm, *op_err; 5652 char msg[SCTP_DIAG_INFO_LEN]; 5653 int un_sent; 5654 int cnt_ctrl_ready = 0; 5655 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5656 struct sctp_tcb *stcb = NULL; 5657 struct sctp_nets *net = NULL; 5658 5659 SCTP_STAT_INCR(sctps_recvdatagrams); 5660 #ifdef SCTP_AUDITING_ENABLED 5661 sctp_audit_log(0xE0, 1); 5662 sctp_auditing(0, inp, stcb, net); 5663 #endif 5664 #if !defined(SCTP_WITH_NO_CSUM) 5665 if (compute_crc != 0) { 5666 uint32_t check, calc_check; 5667 5668 check = sh->checksum; 5669 sh->checksum = 0; 5670 calc_check = sctp_calculate_cksum(m, iphlen); 5671 sh->checksum = check; 5672 if (calc_check != check) { 5673 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5674 calc_check, check, (void *)m, length, iphlen); 5675 stcb = sctp_findassociation_addr(m, offset, src, dst, 5676 sh, ch, &inp, &net, vrf_id); 5677 #if defined(INET) || defined(INET6) 5678 if ((ch->chunk_type != SCTP_INITIATION) && 5679 (net != NULL) && (net->port != port)) { 5680 if (net->port == 0) { 5681 /* UDP encapsulation turned on. */ 5682 net->mtu -= sizeof(struct udphdr); 5683 if (stcb->asoc.smallest_mtu > net->mtu) { 5684 sctp_pathmtu_adjustment(stcb, net->mtu); 5685 } 5686 } else if (port == 0) { 5687 /* UDP encapsulation turned off. */ 5688 net->mtu += sizeof(struct udphdr); 5689 /* XXX Update smallest_mtu */ 5690 } 5691 net->port = port; 5692 } 5693 #endif 5694 if (net != NULL) { 5695 net->flowtype = mflowtype; 5696 net->flowid = mflowid; 5697 } 5698 if ((inp != NULL) && (stcb != NULL)) { 5699 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5700 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5701 } else if ((inp != NULL) && (stcb == NULL)) { 5702 inp_decr = inp; 5703 } 5704 SCTP_STAT_INCR(sctps_badsum); 5705 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5706 goto out; 5707 } 5708 } 5709 #endif 5710 /* Destination port of 0 is illegal, based on RFC4960. */ 5711 if (sh->dest_port == 0) { 5712 SCTP_STAT_INCR(sctps_hdrops); 5713 goto out; 5714 } 5715 stcb = sctp_findassociation_addr(m, offset, src, dst, 5716 sh, ch, &inp, &net, vrf_id); 5717 #if defined(INET) || defined(INET6) 5718 if ((ch->chunk_type != SCTP_INITIATION) && 5719 (net != NULL) && (net->port != port)) { 5720 if (net->port == 0) { 5721 /* UDP encapsulation turned on. */ 5722 net->mtu -= sizeof(struct udphdr); 5723 if (stcb->asoc.smallest_mtu > net->mtu) { 5724 sctp_pathmtu_adjustment(stcb, net->mtu); 5725 } 5726 } else if (port == 0) { 5727 /* UDP encapsulation turned off. */ 5728 net->mtu += sizeof(struct udphdr); 5729 /* XXX Update smallest_mtu */ 5730 } 5731 net->port = port; 5732 } 5733 #endif 5734 if (net != NULL) { 5735 net->flowtype = mflowtype; 5736 net->flowid = mflowid; 5737 } 5738 if (inp == NULL) { 5739 SCTP_STAT_INCR(sctps_noport); 5740 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5741 goto out; 5742 } 5743 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5744 sctp_send_shutdown_complete2(src, dst, sh, 5745 mflowtype, mflowid, fibnum, 5746 vrf_id, port); 5747 goto out; 5748 } 5749 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5750 goto out; 5751 } 5752 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5753 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5754 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5755 (ch->chunk_type != SCTP_INIT))) { 5756 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5757 "Out of the blue"); 5758 sctp_send_abort(m, iphlen, src, dst, 5759 sh, 0, op_err, 5760 mflowtype, mflowid, fibnum, 5761 vrf_id, port); 5762 } 5763 } 5764 goto out; 5765 } else if (stcb == NULL) { 5766 inp_decr = inp; 5767 } 5768 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5769 (void *)m, iphlen, offset, length, (void *)stcb); 5770 if (stcb) { 5771 /* always clear this before beginning a packet */ 5772 stcb->asoc.authenticated = 0; 5773 stcb->asoc.seen_a_sack_this_pkt = 0; 5774 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5775 (void *)stcb, stcb->asoc.state); 5776 5777 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5778 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5779 /*- 5780 * If we hit here, we had a ref count 5781 * up when the assoc was aborted and the 5782 * timer is clearing out the assoc, we should 5783 * NOT respond to any packet.. its OOTB. 5784 */ 5785 SCTP_TCB_UNLOCK(stcb); 5786 stcb = NULL; 5787 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5788 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5789 msg); 5790 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5791 mflowtype, mflowid, inp->fibnum, 5792 vrf_id, port); 5793 goto out; 5794 } 5795 } 5796 if (IS_SCTP_CONTROL(ch)) { 5797 /* process the control portion of the SCTP packet */ 5798 /* sa_ignore NO_NULL_CHK */ 5799 stcb = sctp_process_control(m, iphlen, &offset, length, 5800 src, dst, sh, ch, 5801 inp, stcb, &net, &fwd_tsn_seen, 5802 mflowtype, mflowid, fibnum, 5803 vrf_id, port); 5804 if (stcb) { 5805 /* 5806 * This covers us if the cookie-echo was there and 5807 * it changes our INP. 5808 */ 5809 inp = stcb->sctp_ep; 5810 #if defined(INET) || defined(INET6) 5811 if ((ch->chunk_type != SCTP_INITIATION) && 5812 (net != NULL) && (net->port != port)) { 5813 if (net->port == 0) { 5814 /* UDP encapsulation turned on. */ 5815 net->mtu -= sizeof(struct udphdr); 5816 if (stcb->asoc.smallest_mtu > net->mtu) { 5817 sctp_pathmtu_adjustment(stcb, net->mtu); 5818 } 5819 } else if (port == 0) { 5820 /* UDP encapsulation turned off. */ 5821 net->mtu += sizeof(struct udphdr); 5822 /* XXX Update smallest_mtu */ 5823 } 5824 net->port = port; 5825 } 5826 #endif 5827 } 5828 } else { 5829 /* 5830 * no control chunks, so pre-process DATA chunks (these 5831 * checks are taken care of by control processing) 5832 */ 5833 5834 /* 5835 * if DATA only packet, and auth is required, then punt... 5836 * can't have authenticated without any AUTH (control) 5837 * chunks 5838 */ 5839 if ((stcb != NULL) && 5840 (stcb->asoc.auth_supported == 1) && 5841 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5842 /* "silently" ignore */ 5843 SCTP_STAT_INCR(sctps_recvauthmissing); 5844 goto out; 5845 } 5846 if (stcb == NULL) { 5847 /* out of the blue DATA chunk */ 5848 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5849 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5850 msg); 5851 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5852 mflowtype, mflowid, fibnum, 5853 vrf_id, port); 5854 goto out; 5855 } 5856 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5857 /* v_tag mismatch! */ 5858 SCTP_STAT_INCR(sctps_badvtag); 5859 goto out; 5860 } 5861 } 5862 5863 if (stcb == NULL) { 5864 /* 5865 * no valid TCB for this packet, or we found it's a bad 5866 * packet while processing control, or we're done with this 5867 * packet (done or skip rest of data), so we drop it... 5868 */ 5869 goto out; 5870 } 5871 /* 5872 * DATA chunk processing 5873 */ 5874 /* plow through the data chunks while length > offset */ 5875 5876 /* 5877 * Rest should be DATA only. Check authentication state if AUTH for 5878 * DATA is required. 5879 */ 5880 if ((length > offset) && 5881 (stcb != NULL) && 5882 (stcb->asoc.auth_supported == 1) && 5883 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5884 !stcb->asoc.authenticated) { 5885 /* "silently" ignore */ 5886 SCTP_STAT_INCR(sctps_recvauthmissing); 5887 SCTPDBG(SCTP_DEBUG_AUTH1, 5888 "Data chunk requires AUTH, skipped\n"); 5889 goto trigger_send; 5890 } 5891 if (length > offset) { 5892 int retval; 5893 5894 /* 5895 * First check to make sure our state is correct. We would 5896 * not get here unless we really did have a tag, so we don't 5897 * abort if this happens, just dump the chunk silently. 5898 */ 5899 switch (SCTP_GET_STATE(&stcb->asoc)) { 5900 case SCTP_STATE_COOKIE_ECHOED: 5901 /* 5902 * we consider data with valid tags in this state 5903 * shows us the cookie-ack was lost. Imply it was 5904 * there. 5905 */ 5906 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5907 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5908 stcb->asoc.overall_error_count, 5909 0, 5910 SCTP_FROM_SCTP_INPUT, 5911 __LINE__); 5912 } 5913 stcb->asoc.overall_error_count = 0; 5914 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5915 break; 5916 case SCTP_STATE_COOKIE_WAIT: 5917 /* 5918 * We consider OOTB any data sent during asoc setup. 5919 */ 5920 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5921 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5922 msg); 5923 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5924 mflowtype, mflowid, inp->fibnum, 5925 vrf_id, port); 5926 goto out; 5927 /* sa_ignore NOTREACHED */ 5928 break; 5929 case SCTP_STATE_EMPTY: /* should not happen */ 5930 case SCTP_STATE_INUSE: /* should not happen */ 5931 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5932 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5933 default: 5934 goto out; 5935 /* sa_ignore NOTREACHED */ 5936 break; 5937 case SCTP_STATE_OPEN: 5938 case SCTP_STATE_SHUTDOWN_SENT: 5939 break; 5940 } 5941 /* plow through the data chunks while length > offset */ 5942 retval = sctp_process_data(mm, iphlen, &offset, length, 5943 inp, stcb, net, &high_tsn); 5944 if (retval == 2) { 5945 /* 5946 * The association aborted, NO UNLOCK needed since 5947 * the association is destroyed. 5948 */ 5949 stcb = NULL; 5950 goto out; 5951 } 5952 data_processed = 1; 5953 /* 5954 * Anything important needs to have been m_copy'ed in 5955 * process_data 5956 */ 5957 } 5958 /* take care of ecn */ 5959 if ((data_processed == 1) && 5960 (stcb->asoc.ecn_supported == 1) && 5961 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5962 /* Yep, we need to add a ECNE */ 5963 sctp_send_ecn_echo(stcb, net, high_tsn); 5964 } 5965 if ((data_processed == 0) && (fwd_tsn_seen)) { 5966 int was_a_gap; 5967 uint32_t highest_tsn; 5968 5969 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5970 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5971 } else { 5972 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5973 } 5974 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5975 stcb->asoc.send_sack = 1; 5976 sctp_sack_check(stcb, was_a_gap); 5977 } else if (fwd_tsn_seen) { 5978 stcb->asoc.send_sack = 1; 5979 } 5980 /* trigger send of any chunks in queue... */ 5981 trigger_send: 5982 #ifdef SCTP_AUDITING_ENABLED 5983 sctp_audit_log(0xE0, 2); 5984 sctp_auditing(1, inp, stcb, net); 5985 #endif 5986 SCTPDBG(SCTP_DEBUG_INPUT1, 5987 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5988 stcb->asoc.peers_rwnd, 5989 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5990 stcb->asoc.total_flight); 5991 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5992 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5993 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5994 } 5995 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5996 cnt_ctrl_ready || 5997 stcb->asoc.trigger_reset || 5998 ((un_sent) && 5999 (stcb->asoc.peers_rwnd > 0 || 6000 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6001 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6002 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6003 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6004 } 6005 #ifdef SCTP_AUDITING_ENABLED 6006 sctp_audit_log(0xE0, 3); 6007 sctp_auditing(2, inp, stcb, net); 6008 #endif 6009 out: 6010 if (stcb != NULL) { 6011 SCTP_TCB_UNLOCK(stcb); 6012 } 6013 if (inp_decr != NULL) { 6014 /* reduce ref-count */ 6015 SCTP_INP_WLOCK(inp_decr); 6016 SCTP_INP_DECR_REF(inp_decr); 6017 SCTP_INP_WUNLOCK(inp_decr); 6018 } 6019 return; 6020 } 6021 6022 #ifdef INET 6023 void 6024 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6025 { 6026 struct mbuf *m; 6027 int iphlen; 6028 uint32_t vrf_id = 0; 6029 uint8_t ecn_bits; 6030 struct sockaddr_in src, dst; 6031 struct ip *ip; 6032 struct sctphdr *sh; 6033 struct sctp_chunkhdr *ch; 6034 int length, offset; 6035 #if !defined(SCTP_WITH_NO_CSUM) 6036 uint8_t compute_crc; 6037 #endif 6038 uint32_t mflowid; 6039 uint8_t mflowtype; 6040 uint16_t fibnum; 6041 6042 iphlen = off; 6043 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6044 SCTP_RELEASE_PKT(i_pak); 6045 return; 6046 } 6047 m = SCTP_HEADER_TO_CHAIN(i_pak); 6048 #ifdef SCTP_MBUF_LOGGING 6049 /* Log in any input mbufs */ 6050 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6051 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6052 } 6053 #endif 6054 #ifdef SCTP_PACKET_LOGGING 6055 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6056 sctp_packet_log(m); 6057 } 6058 #endif 6059 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6060 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6061 m->m_pkthdr.len, 6062 if_name(m->m_pkthdr.rcvif), 6063 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6064 mflowid = m->m_pkthdr.flowid; 6065 mflowtype = M_HASHTYPE_GET(m); 6066 fibnum = M_GETFIB(m); 6067 SCTP_STAT_INCR(sctps_recvpackets); 6068 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6069 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6070 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6071 if (SCTP_BUF_LEN(m) < offset) { 6072 if ((m = m_pullup(m, offset)) == NULL) { 6073 SCTP_STAT_INCR(sctps_hdrops); 6074 return; 6075 } 6076 } 6077 ip = mtod(m, struct ip *); 6078 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6079 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6080 offset -= sizeof(struct sctp_chunkhdr); 6081 memset(&src, 0, sizeof(struct sockaddr_in)); 6082 src.sin_family = AF_INET; 6083 src.sin_len = sizeof(struct sockaddr_in); 6084 src.sin_port = sh->src_port; 6085 src.sin_addr = ip->ip_src; 6086 memset(&dst, 0, sizeof(struct sockaddr_in)); 6087 dst.sin_family = AF_INET; 6088 dst.sin_len = sizeof(struct sockaddr_in); 6089 dst.sin_port = sh->dest_port; 6090 dst.sin_addr = ip->ip_dst; 6091 length = ntohs(ip->ip_len); 6092 /* Validate mbuf chain length with IP payload length. */ 6093 if (SCTP_HEADER_LEN(m) != length) { 6094 SCTPDBG(SCTP_DEBUG_INPUT1, 6095 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6096 SCTP_STAT_INCR(sctps_hdrops); 6097 goto out; 6098 } 6099 /* SCTP does not allow broadcasts or multicasts */ 6100 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6101 goto out; 6102 } 6103 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6104 goto out; 6105 } 6106 ecn_bits = ip->ip_tos; 6107 #if defined(SCTP_WITH_NO_CSUM) 6108 SCTP_STAT_INCR(sctps_recvnocrc); 6109 #else 6110 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6111 SCTP_STAT_INCR(sctps_recvhwcrc); 6112 compute_crc = 0; 6113 } else { 6114 SCTP_STAT_INCR(sctps_recvswcrc); 6115 compute_crc = 1; 6116 } 6117 #endif 6118 sctp_common_input_processing(&m, iphlen, offset, length, 6119 (struct sockaddr *)&src, 6120 (struct sockaddr *)&dst, 6121 sh, ch, 6122 #if !defined(SCTP_WITH_NO_CSUM) 6123 compute_crc, 6124 #endif 6125 ecn_bits, 6126 mflowtype, mflowid, fibnum, 6127 vrf_id, port); 6128 out: 6129 if (m) { 6130 sctp_m_freem(m); 6131 } 6132 return; 6133 } 6134 6135 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6136 extern int *sctp_cpuarry; 6137 #endif 6138 6139 int 6140 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6141 { 6142 struct mbuf *m; 6143 int off; 6144 6145 m = *mp; 6146 off = *offp; 6147 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6148 if (mp_ncpus > 1) { 6149 struct ip *ip; 6150 struct sctphdr *sh; 6151 int offset; 6152 int cpu_to_use; 6153 uint32_t flowid, tag; 6154 6155 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6156 flowid = m->m_pkthdr.flowid; 6157 } else { 6158 /* 6159 * No flow id built by lower layers fix it so we 6160 * create one. 6161 */ 6162 offset = off + sizeof(struct sctphdr); 6163 if (SCTP_BUF_LEN(m) < offset) { 6164 if ((m = m_pullup(m, offset)) == NULL) { 6165 SCTP_STAT_INCR(sctps_hdrops); 6166 return (IPPROTO_DONE); 6167 } 6168 } 6169 ip = mtod(m, struct ip *); 6170 sh = (struct sctphdr *)((caddr_t)ip + off); 6171 tag = htonl(sh->v_tag); 6172 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6173 m->m_pkthdr.flowid = flowid; 6174 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6175 } 6176 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6177 sctp_queue_to_mcore(m, off, cpu_to_use); 6178 return (IPPROTO_DONE); 6179 } 6180 #endif 6181 sctp_input_with_port(m, off, 0); 6182 return (IPPROTO_DONE); 6183 } 6184 #endif 6185