1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #if defined(INET) || defined(INET6) 53 #include <netinet/udp.h> 54 #endif 55 #include <netinet/in_kdtrace.h> 56 #include <sys/smp.h> 57 58 59 60 static void 61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 62 { 63 struct sctp_nets *net; 64 65 /* 66 * This now not only stops all cookie timers it also stops any INIT 67 * timers as well. This will make sure that the timers are stopped 68 * in all collision cases. 69 */ 70 SCTP_TCB_LOCK_ASSERT(stcb); 71 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 72 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 77 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 78 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 79 stcb->sctp_ep, 80 stcb, 81 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 82 } 83 } 84 } 85 86 /* INIT handler */ 87 static void 88 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 89 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 90 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 91 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 92 uint8_t mflowtype, uint32_t mflowid, 93 uint32_t vrf_id, uint16_t port) 94 { 95 struct sctp_init *init; 96 struct mbuf *op_err; 97 98 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 99 (void *)stcb); 100 if (stcb == NULL) { 101 SCTP_INP_RLOCK(inp); 102 } 103 /* validate length */ 104 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 105 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 106 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 107 mflowtype, mflowid, 108 vrf_id, port); 109 if (stcb) 110 *abort_no_unlock = 1; 111 goto outnow; 112 } 113 /* validate parameters */ 114 init = &cp->init; 115 if (init->initiate_tag == 0) { 116 /* protocol error... send abort */ 117 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 118 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 119 mflowtype, mflowid, 120 vrf_id, port); 121 if (stcb) 122 *abort_no_unlock = 1; 123 goto outnow; 124 } 125 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 126 /* invalid parameter... send abort */ 127 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 128 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 129 mflowtype, mflowid, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_inbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 138 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 139 mflowtype, mflowid, 140 vrf_id, port); 141 if (stcb) 142 *abort_no_unlock = 1; 143 goto outnow; 144 } 145 if (init->num_outbound_streams == 0) { 146 /* protocol error... send abort */ 147 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 148 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 149 mflowtype, mflowid, 150 vrf_id, port); 151 if (stcb) 152 *abort_no_unlock = 1; 153 goto outnow; 154 } 155 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 156 offset + ntohs(cp->ch.chunk_length))) { 157 /* auth parameter(s) error... send abort */ 158 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 159 "Problem with AUTH parameters"); 160 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 161 mflowtype, mflowid, 162 vrf_id, port); 163 if (stcb) 164 *abort_no_unlock = 1; 165 goto outnow; 166 } 167 /* We are only accepting if we have a listening socket. */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (!SCTP_IS_LISTENING(inp)))) { 172 /* 173 * FIX ME ?? What about TCP model and we have a 174 * match/restart case? Actually no fix is needed. the lookup 175 * will always find the existing assoc so stcb would not be 176 * NULL. It may be questionable to do this since we COULD 177 * just send back the INIT-ACK and hope that the app did 178 * accept()'s by the time the COOKIE was sent. But there is 179 * a price to pay for COOKIE generation and I don't want to 180 * pay it on the chance that the app will actually do some 181 * accepts(). The App just looses and should NOT be in this 182 * state :-) 183 */ 184 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 185 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 186 "No listener"); 187 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 188 mflowtype, mflowid, inp->fibnum, 189 vrf_id, port); 190 } 191 goto outnow; 192 } 193 if ((stcb != NULL) && 194 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 195 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 196 sctp_send_shutdown_ack(stcb, NULL); 197 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 198 } else { 199 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 200 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 201 src, dst, sh, cp, 202 mflowtype, mflowid, 203 vrf_id, port); 204 } 205 outnow: 206 if (stcb == NULL) { 207 SCTP_INP_RUNLOCK(inp); 208 } 209 } 210 211 /* 212 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 213 */ 214 215 int 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 218 SCTP_UNUSED 219 #endif 220 ) 221 { 222 int unsent_data; 223 unsigned int i; 224 struct sctp_stream_queue_pending *sp; 225 struct sctp_association *asoc; 226 227 /* 228 * This function returns if any stream has true unsent data on it. 229 * Note that as it looks through it will clean up any places that 230 * have old data that has been sent but left at top of stream queue. 231 */ 232 asoc = &stcb->asoc; 233 unsent_data = 0; 234 SCTP_TCB_SEND_LOCK(stcb); 235 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 236 /* Check to see if some data queued */ 237 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 238 /* sa_ignore FREED_MEMORY */ 239 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 240 if (sp == NULL) { 241 continue; 242 } 243 if ((sp->msg_is_complete) && 244 (sp->length == 0) && 245 (sp->sender_all_done)) { 246 /* 247 * We are doing differed cleanup. Last time 248 * through when we took all the data the 249 * sender_all_done was not set. 250 */ 251 if (sp->put_last_out == 0) { 252 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 253 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 254 sp->sender_all_done, 255 sp->length, 256 sp->msg_is_complete, 257 sp->put_last_out); 258 } 259 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 260 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 261 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 262 if (sp->net) { 263 sctp_free_remote_addr(sp->net); 264 sp->net = NULL; 265 } 266 if (sp->data) { 267 sctp_m_freem(sp->data); 268 sp->data = NULL; 269 } 270 sctp_free_a_strmoq(stcb, sp, so_locked); 271 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 272 unsent_data++; 273 } 274 } else { 275 unsent_data++; 276 } 277 if (unsent_data > 0) { 278 break; 279 } 280 } 281 } 282 SCTP_TCB_SEND_UNLOCK(stcb); 283 return (unsent_data); 284 } 285 286 static int 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 288 { 289 struct sctp_init *init; 290 struct sctp_association *asoc; 291 struct sctp_nets *lnet; 292 unsigned int i; 293 294 init = &cp->init; 295 asoc = &stcb->asoc; 296 /* save off parameters */ 297 asoc->peer_vtag = ntohl(init->initiate_tag); 298 asoc->peers_rwnd = ntohl(init->a_rwnd); 299 /* init tsn's */ 300 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 301 302 if (!TAILQ_EMPTY(&asoc->nets)) { 303 /* update any ssthresh's that may have a default */ 304 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 305 lnet->ssthresh = asoc->peers_rwnd; 306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 307 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 308 } 309 310 } 311 } 312 SCTP_TCB_SEND_LOCK(stcb); 313 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 314 unsigned int newcnt; 315 struct sctp_stream_out *outs; 316 struct sctp_stream_queue_pending *sp, *nsp; 317 struct sctp_tmit_chunk *chk, *nchk; 318 319 /* abandon the upper streams */ 320 newcnt = ntohs(init->num_inbound_streams); 321 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 322 if (chk->rec.data.sid >= newcnt) { 323 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 324 asoc->send_queue_cnt--; 325 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 326 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 327 #ifdef INVARIANTS 328 } else { 329 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 330 #endif 331 } 332 if (chk->data != NULL) { 333 sctp_free_bufspace(stcb, asoc, chk, 1); 334 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 335 0, chk, SCTP_SO_NOT_LOCKED); 336 if (chk->data) { 337 sctp_m_freem(chk->data); 338 chk->data = NULL; 339 } 340 } 341 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 342 /* sa_ignore FREED_MEMORY */ 343 } 344 } 345 if (asoc->strmout) { 346 for (i = newcnt; i < asoc->pre_open_streams; i++) { 347 outs = &asoc->strmout[i]; 348 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 349 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 350 TAILQ_REMOVE(&outs->outqueue, sp, next); 351 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 352 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 353 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 354 if (sp->data) { 355 sctp_m_freem(sp->data); 356 sp->data = NULL; 357 } 358 if (sp->net) { 359 sctp_free_remote_addr(sp->net); 360 sp->net = NULL; 361 } 362 /* Free the chunk */ 363 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 364 /* sa_ignore FREED_MEMORY */ 365 } 366 outs->state = SCTP_STREAM_CLOSED; 367 } 368 } 369 /* cut back the count */ 370 asoc->pre_open_streams = newcnt; 371 } 372 SCTP_TCB_SEND_UNLOCK(stcb); 373 asoc->streamoutcnt = asoc->pre_open_streams; 374 if (asoc->strmout) { 375 for (i = 0; i < asoc->streamoutcnt; i++) { 376 asoc->strmout[i].state = SCTP_STREAM_OPEN; 377 } 378 } 379 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 380 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 381 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 382 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 383 } 384 /* This is the next one we expect */ 385 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 386 387 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 388 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 389 390 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 391 /* open the requested streams */ 392 393 if (asoc->strmin != NULL) { 394 /* Free the old ones */ 395 for (i = 0; i < asoc->streamincnt; i++) { 396 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 397 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].sid = i; 415 asoc->strmin[i].last_mid_delivered = 0xffffffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 418 asoc->strmin[i].pd_api_started = 0; 419 asoc->strmin[i].delivery_started = 0; 420 } 421 /* 422 * load_address_from_init will put the addresses into the 423 * association when the COOKIE is processed or the INIT-ACK is 424 * processed. Both types of COOKIE's existing and new call this 425 * routine. It will remove addresses that are no longer in the 426 * association (for the restarting case where addresses are 427 * removed). Up front when the INIT arrives we will discard it if it 428 * is a restart and new addresses have been added. 429 */ 430 /* sa_ignore MEMLEAK */ 431 return (0); 432 } 433 434 /* 435 * INIT-ACK message processing/consumption returns value < 0 on error 436 */ 437 static int 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 439 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 440 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 441 struct sctp_nets *net, int *abort_no_unlock, 442 uint8_t mflowtype, uint32_t mflowid, 443 uint32_t vrf_id) 444 { 445 struct sctp_association *asoc; 446 struct mbuf *op_err; 447 int retval, abort_flag, cookie_found; 448 int initack_limit; 449 int nat_friendly = 0; 450 451 /* First verify that we have no illegal param's */ 452 abort_flag = 0; 453 cookie_found = 0; 454 455 op_err = sctp_arethere_unrecognized_parameters(m, 456 (offset + sizeof(struct sctp_init_chunk)), 457 &abort_flag, (struct sctp_chunkhdr *)cp, 458 &nat_friendly, &cookie_found); 459 if (abort_flag) { 460 /* Send an abort and notify peer */ 461 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 462 *abort_no_unlock = 1; 463 return (-1); 464 } 465 if (!cookie_found) { 466 uint16_t len; 467 468 /* Only report the missing cookie parameter */ 469 if (op_err != NULL) { 470 sctp_m_freem(op_err); 471 } 472 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 473 /* We abort with an error of missing mandatory param */ 474 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 475 if (op_err != NULL) { 476 struct sctp_error_missing_param *cause; 477 478 SCTP_BUF_LEN(op_err) = len; 479 cause = mtod(op_err, struct sctp_error_missing_param *); 480 /* Subtract the reserved param */ 481 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 482 cause->cause.length = htons(len); 483 cause->num_missing_params = htonl(1); 484 cause->type[0] = htons(SCTP_STATE_COOKIE); 485 } 486 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 487 src, dst, sh, op_err, 488 mflowtype, mflowid, 489 vrf_id, net->port); 490 *abort_no_unlock = 1; 491 return (-3); 492 } 493 asoc = &stcb->asoc; 494 asoc->peer_supports_nat = (uint8_t)nat_friendly; 495 /* process the peer's parameters in the INIT-ACK */ 496 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 497 if (retval < 0) { 498 return (retval); 499 } 500 initack_limit = offset + ntohs(cp->ch.chunk_length); 501 /* load all addresses */ 502 if ((retval = sctp_load_addresses_from_init(stcb, m, 503 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 504 src, dst, NULL, stcb->asoc.port))) { 505 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 506 "Problem with address parameters"); 507 SCTPDBG(SCTP_DEBUG_INPUT1, 508 "Load addresses from INIT causes an abort %d\n", 509 retval); 510 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 511 src, dst, sh, op_err, 512 mflowtype, mflowid, 513 vrf_id, net->port); 514 *abort_no_unlock = 1; 515 return (-1); 516 } 517 /* if the peer doesn't support asconf, flush the asconf queue */ 518 if (asoc->asconf_supported == 0) { 519 struct sctp_asconf_addr *param, *nparam; 520 521 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 522 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 523 SCTP_FREE(param, SCTP_M_ASC_ADDR); 524 } 525 } 526 527 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 528 stcb->asoc.local_hmacs); 529 if (op_err) { 530 sctp_queue_op_err(stcb, op_err); 531 /* queuing will steal away the mbuf chain to the out queue */ 532 op_err = NULL; 533 } 534 /* extract the cookie and queue it to "echo" it back... */ 535 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 536 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 537 stcb->asoc.overall_error_count, 538 0, 539 SCTP_FROM_SCTP_INPUT, 540 __LINE__); 541 } 542 stcb->asoc.overall_error_count = 0; 543 net->error_count = 0; 544 545 /* 546 * Cancel the INIT timer, We do this first before queueing the 547 * cookie. We always cancel at the primary to assue that we are 548 * canceling the timer started by the INIT which always goes to the 549 * primary. 550 */ 551 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 552 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 553 554 /* calculate the RTO */ 555 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 556 SCTP_RTT_FROM_NON_DATA); 557 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 558 return (retval); 559 } 560 561 static void 562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 563 struct sctp_tcb *stcb, struct sctp_nets *net) 564 { 565 union sctp_sockstore store; 566 struct sctp_nets *r_net, *f_net; 567 struct timeval tv; 568 int req_prim = 0; 569 uint16_t old_error_counter; 570 571 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 572 /* Invalid length */ 573 return; 574 } 575 576 memset(&store, 0, sizeof(store)); 577 switch (cp->heartbeat.hb_info.addr_family) { 578 #ifdef INET 579 case AF_INET: 580 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 581 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 582 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 583 store.sin.sin_port = stcb->rport; 584 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 585 sizeof(store.sin.sin_addr)); 586 } else { 587 return; 588 } 589 break; 590 #endif 591 #ifdef INET6 592 case AF_INET6: 593 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 594 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 595 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 596 store.sin6.sin6_port = stcb->rport; 597 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 598 } else { 599 return; 600 } 601 break; 602 #endif 603 default: 604 return; 605 } 606 r_net = sctp_findnet(stcb, &store.sa); 607 if (r_net == NULL) { 608 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 609 return; 610 } 611 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 612 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 613 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 614 /* 615 * If the its a HB and it's random value is correct when can 616 * confirm the destination. 617 */ 618 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 619 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 620 stcb->asoc.primary_destination = r_net; 621 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 622 f_net = TAILQ_FIRST(&stcb->asoc.nets); 623 if (f_net != r_net) { 624 /* 625 * first one on the list is NOT the primary 626 * sctp_cmpaddr() is much more efficient if 627 * the primary is the first on the list, 628 * make it so. 629 */ 630 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 631 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 632 } 633 req_prim = 1; 634 } 635 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 636 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 637 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 638 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 639 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 640 } 641 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 642 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 643 stcb->asoc.overall_error_count, 644 0, 645 SCTP_FROM_SCTP_INPUT, 646 __LINE__); 647 } 648 stcb->asoc.overall_error_count = 0; 649 old_error_counter = r_net->error_count; 650 r_net->error_count = 0; 651 r_net->hb_responded = 1; 652 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 653 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 654 /* Now lets do a RTO with this */ 655 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 656 SCTP_RTT_FROM_NON_DATA); 657 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 658 r_net->dest_state |= SCTP_ADDR_REACHABLE; 659 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 660 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 661 } 662 if (r_net->dest_state & SCTP_ADDR_PF) { 663 r_net->dest_state &= ~SCTP_ADDR_PF; 664 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 665 } 666 if (old_error_counter > 0) { 667 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 668 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 669 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 670 } 671 if (r_net == stcb->asoc.primary_destination) { 672 if (stcb->asoc.alternate) { 673 /* release the alternate, primary is good */ 674 sctp_free_remote_addr(stcb->asoc.alternate); 675 stcb->asoc.alternate = NULL; 676 } 677 } 678 /* Mobility adaptation */ 679 if (req_prim) { 680 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 681 SCTP_MOBILITY_BASE) || 682 sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_FASTHANDOFF)) && 684 sctp_is_mobility_feature_on(stcb->sctp_ep, 685 SCTP_MOBILITY_PRIM_DELETED)) { 686 687 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 688 stcb->sctp_ep, stcb, NULL, 689 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 690 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 691 SCTP_MOBILITY_FASTHANDOFF)) { 692 sctp_assoc_immediate_retrans(stcb, 693 stcb->asoc.primary_destination); 694 } 695 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 696 SCTP_MOBILITY_BASE)) { 697 sctp_move_chunks_from_net(stcb, 698 stcb->asoc.deleted_primary); 699 } 700 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 701 stcb->asoc.deleted_primary); 702 } 703 } 704 } 705 706 static int 707 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 708 { 709 /* 710 * Return 0 means we want you to proceed with the abort non-zero 711 * means no abort processing. 712 */ 713 uint32_t new_vtag; 714 struct sctpasochead *head; 715 716 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 717 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 718 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 719 atomic_add_int(&stcb->asoc.refcnt, 1); 720 SCTP_TCB_UNLOCK(stcb); 721 SCTP_INP_INFO_WLOCK(); 722 SCTP_TCB_LOCK(stcb); 723 atomic_subtract_int(&stcb->asoc.refcnt, 1); 724 } else { 725 return (0); 726 } 727 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 728 /* generate a new vtag and send init */ 729 LIST_REMOVE(stcb, sctp_asocs); 730 stcb->asoc.my_vtag = new_vtag; 731 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 732 /* 733 * put it in the bucket in the vtag hash of assoc's for the 734 * system 735 */ 736 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 737 SCTP_INP_INFO_WUNLOCK(); 738 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 739 return (1); 740 } else { 741 /* 742 * treat like a case where the cookie expired i.e.: - dump 743 * current cookie. - generate a new vtag. - resend init. 744 */ 745 /* generate a new vtag and send init */ 746 LIST_REMOVE(stcb, sctp_asocs); 747 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 748 sctp_stop_all_cookie_timers(stcb); 749 sctp_toss_old_cookies(stcb, &stcb->asoc); 750 stcb->asoc.my_vtag = new_vtag; 751 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 752 /* 753 * put it in the bucket in the vtag hash of assoc's for the 754 * system 755 */ 756 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 757 SCTP_INP_INFO_WUNLOCK(); 758 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 759 return (1); 760 } 761 return (0); 762 } 763 764 static int 765 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 766 struct sctp_nets *net) 767 { 768 /* 769 * return 0 means we want you to proceed with the abort non-zero 770 * means no abort processing 771 */ 772 if (stcb->asoc.auth_supported == 0) { 773 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 774 return (0); 775 } 776 sctp_asconf_send_nat_state_update(stcb, net); 777 return (1); 778 } 779 780 781 /* Returns 1 if the stcb was aborted, 0 otherwise */ 782 static int 783 sctp_handle_abort(struct sctp_abort_chunk *abort, 784 struct sctp_tcb *stcb, struct sctp_nets *net) 785 { 786 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 787 struct socket *so; 788 #endif 789 uint16_t len; 790 uint16_t error; 791 792 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 793 if (stcb == NULL) 794 return (0); 795 796 len = ntohs(abort->ch.chunk_length); 797 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 798 /* 799 * Need to check the cause codes for our two magic nat 800 * aborts which don't kill the assoc necessarily. 801 */ 802 struct sctp_error_cause *cause; 803 804 cause = (struct sctp_error_cause *)(abort + 1); 805 error = ntohs(cause->code); 806 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 807 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 808 abort->ch.chunk_flags); 809 if (sctp_handle_nat_colliding_state(stcb)) { 810 return (0); 811 } 812 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 813 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 814 abort->ch.chunk_flags); 815 if (sctp_handle_nat_missing_state(stcb, net)) { 816 return (0); 817 } 818 } 819 } else { 820 error = 0; 821 } 822 /* stop any receive timers */ 823 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 824 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 825 /* notify user of the abort and clean up... */ 826 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 827 /* free the tcb */ 828 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 829 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 830 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 831 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 832 } 833 #ifdef SCTP_ASOCLOG_OF_TSNS 834 sctp_print_out_track_log(stcb); 835 #endif 836 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 837 so = SCTP_INP_SO(stcb->sctp_ep); 838 atomic_add_int(&stcb->asoc.refcnt, 1); 839 SCTP_TCB_UNLOCK(stcb); 840 SCTP_SOCKET_LOCK(so, 1); 841 SCTP_TCB_LOCK(stcb); 842 atomic_subtract_int(&stcb->asoc.refcnt, 1); 843 #endif 844 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); 845 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 846 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 847 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 848 SCTP_SOCKET_UNLOCK(so, 1); 849 #endif 850 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 851 return (1); 852 } 853 854 static void 855 sctp_start_net_timers(struct sctp_tcb *stcb) 856 { 857 uint32_t cnt_hb_sent; 858 struct sctp_nets *net; 859 860 cnt_hb_sent = 0; 861 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 862 /* 863 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 864 * If the dest in unconfirmed send a hb as well if under 865 * max_hb_burst have been sent. 866 */ 867 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 868 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 869 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 870 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 871 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 872 cnt_hb_sent++; 873 } 874 } 875 if (cnt_hb_sent) { 876 sctp_chunk_output(stcb->sctp_ep, stcb, 877 SCTP_OUTPUT_FROM_COOKIE_ACK, 878 SCTP_SO_NOT_LOCKED); 879 } 880 } 881 882 883 static void 884 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 885 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 886 { 887 struct sctp_association *asoc; 888 int some_on_streamwheel; 889 int old_state; 890 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 891 struct socket *so; 892 #endif 893 894 SCTPDBG(SCTP_DEBUG_INPUT2, 895 "sctp_handle_shutdown: handling SHUTDOWN\n"); 896 if (stcb == NULL) 897 return; 898 asoc = &stcb->asoc; 899 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 900 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 901 return; 902 } 903 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 904 /* Shutdown NOT the expected size */ 905 return; 906 } 907 old_state = SCTP_GET_STATE(stcb); 908 sctp_update_acked(stcb, cp, abort_flag); 909 if (*abort_flag) { 910 return; 911 } 912 if (asoc->control_pdapi) { 913 /* 914 * With a normal shutdown we assume the end of last record. 915 */ 916 SCTP_INP_READ_LOCK(stcb->sctp_ep); 917 if (asoc->control_pdapi->on_strm_q) { 918 struct sctp_stream_in *strm; 919 920 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 921 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 922 /* Unordered */ 923 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 924 asoc->control_pdapi->on_strm_q = 0; 925 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 926 /* Ordered */ 927 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 928 asoc->control_pdapi->on_strm_q = 0; 929 #ifdef INVARIANTS 930 } else { 931 panic("Unknown state on ctrl:%p on_strm_q:%d", 932 asoc->control_pdapi, 933 asoc->control_pdapi->on_strm_q); 934 #endif 935 } 936 } 937 asoc->control_pdapi->end_added = 1; 938 asoc->control_pdapi->pdapi_aborted = 1; 939 asoc->control_pdapi = NULL; 940 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 941 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 942 so = SCTP_INP_SO(stcb->sctp_ep); 943 atomic_add_int(&stcb->asoc.refcnt, 1); 944 SCTP_TCB_UNLOCK(stcb); 945 SCTP_SOCKET_LOCK(so, 1); 946 SCTP_TCB_LOCK(stcb); 947 atomic_subtract_int(&stcb->asoc.refcnt, 1); 948 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 949 /* assoc was freed while we were unlocked */ 950 SCTP_SOCKET_UNLOCK(so, 1); 951 return; 952 } 953 #endif 954 if (stcb->sctp_socket) { 955 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 956 } 957 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 958 SCTP_SOCKET_UNLOCK(so, 1); 959 #endif 960 } 961 /* goto SHUTDOWN_RECEIVED state to block new requests */ 962 if (stcb->sctp_socket) { 963 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 964 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 965 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 966 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 967 /* 968 * notify upper layer that peer has initiated a 969 * shutdown 970 */ 971 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 972 973 /* reset time */ 974 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 975 } 976 } 977 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 978 /* 979 * stop the shutdown timer, since we WILL move to 980 * SHUTDOWN-ACK-SENT. 981 */ 982 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 983 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 984 } 985 /* Now is there unsent data on a stream somewhere? */ 986 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 987 988 if (!TAILQ_EMPTY(&asoc->send_queue) || 989 !TAILQ_EMPTY(&asoc->sent_queue) || 990 some_on_streamwheel) { 991 /* By returning we will push more data out */ 992 return; 993 } else { 994 /* no outstanding data to send, so move on... */ 995 /* send SHUTDOWN-ACK */ 996 /* move to SHUTDOWN-ACK-SENT state */ 997 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 998 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 999 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 1000 } 1001 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 1002 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 1003 sctp_stop_timers_for_shutdown(stcb); 1004 sctp_send_shutdown_ack(stcb, net); 1005 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 1006 stcb->sctp_ep, stcb, net); 1007 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1008 sctp_send_shutdown_ack(stcb, net); 1009 } 1010 } 1011 } 1012 1013 static void 1014 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1015 struct sctp_tcb *stcb, 1016 struct sctp_nets *net) 1017 { 1018 struct sctp_association *asoc; 1019 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1020 struct socket *so; 1021 1022 so = SCTP_INP_SO(stcb->sctp_ep); 1023 #endif 1024 SCTPDBG(SCTP_DEBUG_INPUT2, 1025 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1026 if (stcb == NULL) 1027 return; 1028 1029 asoc = &stcb->asoc; 1030 /* process according to association state */ 1031 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1032 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1033 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1034 sctp_send_shutdown_complete(stcb, net, 1); 1035 SCTP_TCB_UNLOCK(stcb); 1036 return; 1037 } 1038 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 1039 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1040 /* unexpected SHUTDOWN-ACK... so ignore... */ 1041 SCTP_TCB_UNLOCK(stcb); 1042 return; 1043 } 1044 if (asoc->control_pdapi) { 1045 /* 1046 * With a normal shutdown we assume the end of last record. 1047 */ 1048 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1049 asoc->control_pdapi->end_added = 1; 1050 asoc->control_pdapi->pdapi_aborted = 1; 1051 asoc->control_pdapi = NULL; 1052 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1053 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1054 atomic_add_int(&stcb->asoc.refcnt, 1); 1055 SCTP_TCB_UNLOCK(stcb); 1056 SCTP_SOCKET_LOCK(so, 1); 1057 SCTP_TCB_LOCK(stcb); 1058 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1059 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1060 /* assoc was freed while we were unlocked */ 1061 SCTP_SOCKET_UNLOCK(so, 1); 1062 return; 1063 } 1064 #endif 1065 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1066 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1067 SCTP_SOCKET_UNLOCK(so, 1); 1068 #endif 1069 } 1070 #ifdef INVARIANTS 1071 if (!TAILQ_EMPTY(&asoc->send_queue) || 1072 !TAILQ_EMPTY(&asoc->sent_queue) || 1073 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1074 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1075 } 1076 #endif 1077 /* stop the timer */ 1078 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1079 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1080 /* send SHUTDOWN-COMPLETE */ 1081 sctp_send_shutdown_complete(stcb, net, 0); 1082 /* notify upper layer protocol */ 1083 if (stcb->sctp_socket) { 1084 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1085 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1086 stcb->sctp_socket->so_snd.sb_cc = 0; 1087 } 1088 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1089 } 1090 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1091 /* free the TCB but first save off the ep */ 1092 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1093 atomic_add_int(&stcb->asoc.refcnt, 1); 1094 SCTP_TCB_UNLOCK(stcb); 1095 SCTP_SOCKET_LOCK(so, 1); 1096 SCTP_TCB_LOCK(stcb); 1097 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1098 #endif 1099 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1100 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1101 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1102 SCTP_SOCKET_UNLOCK(so, 1); 1103 #endif 1104 } 1105 1106 static void 1107 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type, 1108 struct sctp_nets *net) 1109 { 1110 switch (chunk_type) { 1111 case SCTP_ASCONF_ACK: 1112 case SCTP_ASCONF: 1113 sctp_asconf_cleanup(stcb, net); 1114 break; 1115 case SCTP_IFORWARD_CUM_TSN: 1116 case SCTP_FORWARD_CUM_TSN: 1117 stcb->asoc.prsctp_supported = 0; 1118 break; 1119 default: 1120 SCTPDBG(SCTP_DEBUG_INPUT2, 1121 "Peer does not support chunk type %d (0x%x).\n", 1122 chunk_type, chunk_type); 1123 break; 1124 } 1125 } 1126 1127 /* 1128 * Skip past the param header and then we will find the param that caused the 1129 * problem. There are a number of param's in a ASCONF OR the prsctp param 1130 * these will turn of specific features. 1131 * XXX: Is this the right thing to do? 1132 */ 1133 static void 1134 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1135 { 1136 switch (parameter_type) { 1137 /* pr-sctp draft */ 1138 case SCTP_PRSCTP_SUPPORTED: 1139 stcb->asoc.prsctp_supported = 0; 1140 break; 1141 case SCTP_SUPPORTED_CHUNK_EXT: 1142 break; 1143 /* draft-ietf-tsvwg-addip-sctp */ 1144 case SCTP_HAS_NAT_SUPPORT: 1145 stcb->asoc.peer_supports_nat = 0; 1146 break; 1147 case SCTP_ADD_IP_ADDRESS: 1148 case SCTP_DEL_IP_ADDRESS: 1149 case SCTP_SET_PRIM_ADDR: 1150 stcb->asoc.asconf_supported = 0; 1151 break; 1152 case SCTP_SUCCESS_REPORT: 1153 case SCTP_ERROR_CAUSE_IND: 1154 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1155 SCTPDBG(SCTP_DEBUG_INPUT2, 1156 "Turning off ASCONF to this strange peer\n"); 1157 stcb->asoc.asconf_supported = 0; 1158 break; 1159 default: 1160 SCTPDBG(SCTP_DEBUG_INPUT2, 1161 "Peer does not support param type %d (0x%x)??\n", 1162 parameter_type, parameter_type); 1163 break; 1164 } 1165 } 1166 1167 static int 1168 sctp_handle_error(struct sctp_chunkhdr *ch, 1169 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1170 { 1171 struct sctp_error_cause *cause; 1172 struct sctp_association *asoc; 1173 uint32_t remaining_length, adjust; 1174 uint16_t code, cause_code, cause_length; 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 cause = (struct sctp_error_cause *)((caddr_t)ch + 1182 sizeof(struct sctp_chunkhdr)); 1183 remaining_length = ntohs(ch->chunk_length); 1184 if (remaining_length > limit) { 1185 remaining_length = limit; 1186 } 1187 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1188 remaining_length -= sizeof(struct sctp_chunkhdr); 1189 } else { 1190 remaining_length = 0; 1191 } 1192 code = 0; 1193 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1194 /* Process an Error Cause */ 1195 cause_code = ntohs(cause->code); 1196 cause_length = ntohs(cause->length); 1197 if ((cause_length > remaining_length) || (cause_length == 0)) { 1198 /* Invalid cause length, possibly due to truncation. */ 1199 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1200 remaining_length, cause_length); 1201 return (0); 1202 } 1203 if (code == 0) { 1204 /* report the first error cause */ 1205 code = cause_code; 1206 } 1207 switch (cause_code) { 1208 case SCTP_CAUSE_INVALID_STREAM: 1209 case SCTP_CAUSE_MISSING_PARAM: 1210 case SCTP_CAUSE_INVALID_PARAM: 1211 case SCTP_CAUSE_NO_USER_DATA: 1212 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1213 cause_code); 1214 break; 1215 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1216 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1217 ch->chunk_flags); 1218 if (sctp_handle_nat_colliding_state(stcb)) { 1219 return (0); 1220 } 1221 break; 1222 case SCTP_CAUSE_NAT_MISSING_STATE: 1223 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1224 ch->chunk_flags); 1225 if (sctp_handle_nat_missing_state(stcb, net)) { 1226 return (0); 1227 } 1228 break; 1229 case SCTP_CAUSE_STALE_COOKIE: 1230 /* 1231 * We only act if we have echoed a cookie and are 1232 * waiting. 1233 */ 1234 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1235 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1236 struct sctp_error_stale_cookie *stale_cookie; 1237 1238 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1239 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1240 /* Double it to be more robust on RTX */ 1241 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1242 asoc->cookie_preserve_req *= 2; 1243 } else { 1244 asoc->cookie_preserve_req = UINT32_MAX; 1245 } 1246 asoc->stale_cookie_count++; 1247 if (asoc->stale_cookie_count > 1248 asoc->max_init_times) { 1249 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1250 /* now free the asoc */ 1251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1252 so = SCTP_INP_SO(stcb->sctp_ep); 1253 atomic_add_int(&stcb->asoc.refcnt, 1); 1254 SCTP_TCB_UNLOCK(stcb); 1255 SCTP_SOCKET_LOCK(so, 1); 1256 SCTP_TCB_LOCK(stcb); 1257 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1258 #endif 1259 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1260 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1262 SCTP_SOCKET_UNLOCK(so, 1); 1263 #endif 1264 return (-1); 1265 } 1266 /* blast back to INIT state */ 1267 sctp_toss_old_cookies(stcb, &stcb->asoc); 1268 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1269 sctp_stop_all_cookie_timers(stcb); 1270 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1271 } 1272 break; 1273 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1274 /* 1275 * Nothing we can do here, we don't do hostname 1276 * addresses so if the peer does not like my IPv6 1277 * (or IPv4 for that matter) it does not matter. If 1278 * they don't support that type of address, they can 1279 * NOT possibly get that packet type... i.e. with no 1280 * IPv6 you can't receive a IPv6 packet. so we can 1281 * safely ignore this one. If we ever added support 1282 * for HOSTNAME Addresses, then we would need to do 1283 * something here. 1284 */ 1285 break; 1286 case SCTP_CAUSE_UNRECOG_CHUNK: 1287 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1288 struct sctp_error_unrecognized_chunk *unrec_chunk; 1289 1290 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1291 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net); 1292 } 1293 break; 1294 case SCTP_CAUSE_UNRECOG_PARAM: 1295 /* XXX: We only consider the first parameter */ 1296 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1297 struct sctp_paramhdr *unrec_parameter; 1298 1299 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1300 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1301 } 1302 break; 1303 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1304 /* 1305 * We ignore this since the timer will drive out a 1306 * new cookie anyway and there timer will drive us 1307 * to send a SHUTDOWN_COMPLETE. We can't send one 1308 * here since we don't have their tag. 1309 */ 1310 break; 1311 case SCTP_CAUSE_DELETING_LAST_ADDR: 1312 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1313 case SCTP_CAUSE_DELETING_SRC_ADDR: 1314 /* 1315 * We should NOT get these here, but in a 1316 * ASCONF-ACK. 1317 */ 1318 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1319 cause_code); 1320 break; 1321 case SCTP_CAUSE_OUT_OF_RESC: 1322 /* 1323 * And what, pray tell do we do with the fact that 1324 * the peer is out of resources? Not really sure we 1325 * could do anything but abort. I suspect this 1326 * should have came WITH an abort instead of in a 1327 * OP-ERROR. 1328 */ 1329 break; 1330 default: 1331 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1332 cause_code); 1333 break; 1334 } 1335 adjust = SCTP_SIZE32(cause_length); 1336 if (remaining_length >= adjust) { 1337 remaining_length -= adjust; 1338 } else { 1339 remaining_length = 0; 1340 } 1341 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1342 } 1343 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1344 return (0); 1345 } 1346 1347 static int 1348 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1349 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1350 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1351 struct sctp_nets *net, int *abort_no_unlock, 1352 uint8_t mflowtype, uint32_t mflowid, 1353 uint32_t vrf_id) 1354 { 1355 struct sctp_init_ack *init_ack; 1356 struct mbuf *op_err; 1357 1358 SCTPDBG(SCTP_DEBUG_INPUT2, 1359 "sctp_handle_init_ack: handling INIT-ACK\n"); 1360 1361 if (stcb == NULL) { 1362 SCTPDBG(SCTP_DEBUG_INPUT2, 1363 "sctp_handle_init_ack: TCB is null\n"); 1364 return (-1); 1365 } 1366 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1367 /* Invalid length */ 1368 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1369 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1370 src, dst, sh, op_err, 1371 mflowtype, mflowid, 1372 vrf_id, net->port); 1373 *abort_no_unlock = 1; 1374 return (-1); 1375 } 1376 init_ack = &cp->init; 1377 /* validate parameters */ 1378 if (init_ack->initiate_tag == 0) { 1379 /* protocol error... send an abort */ 1380 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1381 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1382 src, dst, sh, op_err, 1383 mflowtype, mflowid, 1384 vrf_id, net->port); 1385 *abort_no_unlock = 1; 1386 return (-1); 1387 } 1388 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1389 /* protocol error... send an abort */ 1390 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1391 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1392 src, dst, sh, op_err, 1393 mflowtype, mflowid, 1394 vrf_id, net->port); 1395 *abort_no_unlock = 1; 1396 return (-1); 1397 } 1398 if (init_ack->num_inbound_streams == 0) { 1399 /* protocol error... send an abort */ 1400 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1401 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1402 src, dst, sh, op_err, 1403 mflowtype, mflowid, 1404 vrf_id, net->port); 1405 *abort_no_unlock = 1; 1406 return (-1); 1407 } 1408 if (init_ack->num_outbound_streams == 0) { 1409 /* protocol error... send an abort */ 1410 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1411 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1412 src, dst, sh, op_err, 1413 mflowtype, mflowid, 1414 vrf_id, net->port); 1415 *abort_no_unlock = 1; 1416 return (-1); 1417 } 1418 /* process according to association state... */ 1419 switch (SCTP_GET_STATE(stcb)) { 1420 case SCTP_STATE_COOKIE_WAIT: 1421 /* this is the expected state for this chunk */ 1422 /* process the INIT-ACK parameters */ 1423 if (stcb->asoc.primary_destination->dest_state & 1424 SCTP_ADDR_UNCONFIRMED) { 1425 /* 1426 * The primary is where we sent the INIT, we can 1427 * always consider it confirmed when the INIT-ACK is 1428 * returned. Do this before we load addresses 1429 * though. 1430 */ 1431 stcb->asoc.primary_destination->dest_state &= 1432 ~SCTP_ADDR_UNCONFIRMED; 1433 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1434 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1435 } 1436 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1437 net, abort_no_unlock, 1438 mflowtype, mflowid, 1439 vrf_id) < 0) { 1440 /* error in parsing parameters */ 1441 return (-1); 1442 } 1443 /* update our state */ 1444 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1445 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1446 1447 /* reset the RTO calc */ 1448 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1449 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1450 stcb->asoc.overall_error_count, 1451 0, 1452 SCTP_FROM_SCTP_INPUT, 1453 __LINE__); 1454 } 1455 stcb->asoc.overall_error_count = 0; 1456 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1457 /* 1458 * collapse the init timer back in case of a exponential 1459 * backoff 1460 */ 1461 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1462 stcb, net); 1463 /* 1464 * the send at the end of the inbound data processing will 1465 * cause the cookie to be sent 1466 */ 1467 break; 1468 case SCTP_STATE_SHUTDOWN_SENT: 1469 /* incorrect state... discard */ 1470 break; 1471 case SCTP_STATE_COOKIE_ECHOED: 1472 /* incorrect state... discard */ 1473 break; 1474 case SCTP_STATE_OPEN: 1475 /* incorrect state... discard */ 1476 break; 1477 case SCTP_STATE_EMPTY: 1478 case SCTP_STATE_INUSE: 1479 default: 1480 /* incorrect state... discard */ 1481 return (-1); 1482 break; 1483 } 1484 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1485 return (0); 1486 } 1487 1488 static struct sctp_tcb * 1489 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1490 struct sockaddr *src, struct sockaddr *dst, 1491 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1492 struct sctp_inpcb *inp, struct sctp_nets **netp, 1493 struct sockaddr *init_src, int *notification, 1494 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1495 uint8_t mflowtype, uint32_t mflowid, 1496 uint32_t vrf_id, uint16_t port); 1497 1498 1499 /* 1500 * handle a state cookie for an existing association m: input packet mbuf 1501 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1502 * "split" mbuf and the cookie signature does not exist offset: offset into 1503 * mbuf to the cookie-echo chunk 1504 */ 1505 static struct sctp_tcb * 1506 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1507 struct sockaddr *src, struct sockaddr *dst, 1508 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1509 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1510 struct sockaddr *init_src, int *notification, 1511 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1512 uint8_t mflowtype, uint32_t mflowid, 1513 uint32_t vrf_id, uint16_t port) 1514 { 1515 struct sctp_association *asoc; 1516 struct sctp_init_chunk *init_cp, init_buf; 1517 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1518 struct sctp_nets *net; 1519 struct mbuf *op_err; 1520 struct timeval old; 1521 int init_offset, initack_offset, i; 1522 int retval; 1523 int spec_flag = 0; 1524 uint32_t how_indx; 1525 #if defined(SCTP_DETAILED_STR_STATS) 1526 int j; 1527 #endif 1528 1529 net = *netp; 1530 /* I know that the TCB is non-NULL from the caller */ 1531 asoc = &stcb->asoc; 1532 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1533 if (asoc->cookie_how[how_indx] == 0) 1534 break; 1535 } 1536 if (how_indx < sizeof(asoc->cookie_how)) { 1537 asoc->cookie_how[how_indx] = 1; 1538 } 1539 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1540 /* SHUTDOWN came in after sending INIT-ACK */ 1541 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1542 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1543 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1544 mflowtype, mflowid, inp->fibnum, 1545 vrf_id, net->port); 1546 if (how_indx < sizeof(asoc->cookie_how)) 1547 asoc->cookie_how[how_indx] = 2; 1548 return (NULL); 1549 } 1550 /* 1551 * find and validate the INIT chunk in the cookie (peer's info) the 1552 * INIT should start after the cookie-echo header struct (chunk 1553 * header, state cookie header struct) 1554 */ 1555 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1556 1557 init_cp = (struct sctp_init_chunk *) 1558 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1559 (uint8_t *)&init_buf); 1560 if (init_cp == NULL) { 1561 /* could not pull a INIT chunk in cookie */ 1562 return (NULL); 1563 } 1564 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1565 return (NULL); 1566 } 1567 /* 1568 * find and validate the INIT-ACK chunk in the cookie (my info) the 1569 * INIT-ACK follows the INIT chunk 1570 */ 1571 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1572 initack_cp = (struct sctp_init_ack_chunk *) 1573 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1574 (uint8_t *)&initack_buf); 1575 if (initack_cp == NULL) { 1576 /* could not pull INIT-ACK chunk in cookie */ 1577 return (NULL); 1578 } 1579 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1580 return (NULL); 1581 } 1582 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1583 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1584 /* 1585 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1586 * to get into the OPEN state 1587 */ 1588 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1589 /*- 1590 * Opps, this means that we somehow generated two vtag's 1591 * the same. I.e. we did: 1592 * Us Peer 1593 * <---INIT(tag=a)------ 1594 * ----INIT-ACK(tag=t)--> 1595 * ----INIT(tag=t)------> *1 1596 * <---INIT-ACK(tag=a)--- 1597 * <----CE(tag=t)------------- *2 1598 * 1599 * At point *1 we should be generating a different 1600 * tag t'. Which means we would throw away the CE and send 1601 * ours instead. Basically this is case C (throw away side). 1602 */ 1603 if (how_indx < sizeof(asoc->cookie_how)) 1604 asoc->cookie_how[how_indx] = 17; 1605 return (NULL); 1606 1607 } 1608 switch (SCTP_GET_STATE(stcb)) { 1609 case SCTP_STATE_COOKIE_WAIT: 1610 case SCTP_STATE_COOKIE_ECHOED: 1611 /* 1612 * INIT was sent but got a COOKIE_ECHO with the 1613 * correct tags... just accept it...but we must 1614 * process the init so that we can make sure we have 1615 * the right seq no's. 1616 */ 1617 /* First we must process the INIT !! */ 1618 retval = sctp_process_init(init_cp, stcb); 1619 if (retval < 0) { 1620 if (how_indx < sizeof(asoc->cookie_how)) 1621 asoc->cookie_how[how_indx] = 3; 1622 return (NULL); 1623 } 1624 /* we have already processed the INIT so no problem */ 1625 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1626 stcb, net, 1627 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1628 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1629 stcb, net, 1630 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1631 /* update current state */ 1632 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1633 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1634 else 1635 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1636 1637 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1638 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1639 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1640 stcb->sctp_ep, stcb, asoc->primary_destination); 1641 } 1642 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1643 sctp_stop_all_cookie_timers(stcb); 1644 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1645 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1646 (!SCTP_IS_LISTENING(inp))) { 1647 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1648 struct socket *so; 1649 #endif 1650 /* 1651 * Here is where collision would go if we 1652 * did a connect() and instead got a 1653 * init/init-ack/cookie done before the 1654 * init-ack came back.. 1655 */ 1656 stcb->sctp_ep->sctp_flags |= 1657 SCTP_PCB_FLAGS_CONNECTED; 1658 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1659 so = SCTP_INP_SO(stcb->sctp_ep); 1660 atomic_add_int(&stcb->asoc.refcnt, 1); 1661 SCTP_TCB_UNLOCK(stcb); 1662 SCTP_SOCKET_LOCK(so, 1); 1663 SCTP_TCB_LOCK(stcb); 1664 atomic_add_int(&stcb->asoc.refcnt, -1); 1665 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1666 SCTP_SOCKET_UNLOCK(so, 1); 1667 return (NULL); 1668 } 1669 #endif 1670 soisconnected(stcb->sctp_socket); 1671 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1672 SCTP_SOCKET_UNLOCK(so, 1); 1673 #endif 1674 } 1675 /* notify upper layer */ 1676 *notification = SCTP_NOTIFY_ASSOC_UP; 1677 /* 1678 * since we did not send a HB make sure we don't 1679 * double things 1680 */ 1681 old.tv_sec = cookie->time_entered.tv_sec; 1682 old.tv_usec = cookie->time_entered.tv_usec; 1683 net->hb_responded = 1; 1684 sctp_calculate_rto(stcb, asoc, net, &old, 1685 SCTP_RTT_FROM_NON_DATA); 1686 1687 if (stcb->asoc.sctp_autoclose_ticks && 1688 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1689 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1690 inp, stcb, NULL); 1691 } 1692 break; 1693 default: 1694 /* 1695 * we're in the OPEN state (or beyond), so peer must 1696 * have simply lost the COOKIE-ACK 1697 */ 1698 break; 1699 } /* end switch */ 1700 sctp_stop_all_cookie_timers(stcb); 1701 /* 1702 * We ignore the return code here.. not sure if we should 1703 * somehow abort.. but we do have an existing asoc. This 1704 * really should not fail. 1705 */ 1706 if (sctp_load_addresses_from_init(stcb, m, 1707 init_offset + sizeof(struct sctp_init_chunk), 1708 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1709 if (how_indx < sizeof(asoc->cookie_how)) 1710 asoc->cookie_how[how_indx] = 4; 1711 return (NULL); 1712 } 1713 /* respond with a COOKIE-ACK */ 1714 sctp_toss_old_cookies(stcb, asoc); 1715 sctp_send_cookie_ack(stcb); 1716 if (how_indx < sizeof(asoc->cookie_how)) 1717 asoc->cookie_how[how_indx] = 5; 1718 return (stcb); 1719 } 1720 1721 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1722 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1723 cookie->tie_tag_my_vtag == 0 && 1724 cookie->tie_tag_peer_vtag == 0) { 1725 /* 1726 * case C in Section 5.2.4 Table 2: XMOO silently discard 1727 */ 1728 if (how_indx < sizeof(asoc->cookie_how)) 1729 asoc->cookie_how[how_indx] = 6; 1730 return (NULL); 1731 } 1732 /* 1733 * If nat support, and the below and stcb is established, send back 1734 * a ABORT(colliding state) if we are established. 1735 */ 1736 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1737 (asoc->peer_supports_nat) && 1738 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1739 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1740 (asoc->peer_vtag == 0)))) { 1741 /* 1742 * Special case - Peer's support nat. We may have two init's 1743 * that we gave out the same tag on since one was not 1744 * established.. i.e. we get INIT from host-1 behind the nat 1745 * and we respond tag-a, we get a INIT from host-2 behind 1746 * the nat and we get tag-a again. Then we bring up host-1 1747 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1748 * Now we have colliding state. We must send an abort here 1749 * with colliding state indication. 1750 */ 1751 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1752 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1753 mflowtype, mflowid, inp->fibnum, 1754 vrf_id, port); 1755 return (NULL); 1756 } 1757 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1758 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1759 (asoc->peer_vtag == 0))) { 1760 /* 1761 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1762 * should be ok, re-accept peer info 1763 */ 1764 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1765 /* 1766 * Extension of case C. If we hit this, then the 1767 * random number generator returned the same vtag 1768 * when we first sent our INIT-ACK and when we later 1769 * sent our INIT. The side with the seq numbers that 1770 * are different will be the one that normnally 1771 * would have hit case C. This in effect "extends" 1772 * our vtags in this collision case to be 64 bits. 1773 * The same collision could occur aka you get both 1774 * vtag and seq number the same twice in a row.. but 1775 * is much less likely. If it did happen then we 1776 * would proceed through and bring up the assoc.. we 1777 * may end up with the wrong stream setup however.. 1778 * which would be bad.. but there is no way to 1779 * tell.. until we send on a stream that does not 1780 * exist :-) 1781 */ 1782 if (how_indx < sizeof(asoc->cookie_how)) 1783 asoc->cookie_how[how_indx] = 7; 1784 1785 return (NULL); 1786 } 1787 if (how_indx < sizeof(asoc->cookie_how)) 1788 asoc->cookie_how[how_indx] = 8; 1789 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1790 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1791 sctp_stop_all_cookie_timers(stcb); 1792 /* 1793 * since we did not send a HB make sure we don't double 1794 * things 1795 */ 1796 net->hb_responded = 1; 1797 if (stcb->asoc.sctp_autoclose_ticks && 1798 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1799 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1800 NULL); 1801 } 1802 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1803 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1804 1805 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1806 /* 1807 * Ok the peer probably discarded our data (if we 1808 * echoed a cookie+data). So anything on the 1809 * sent_queue should be marked for retransmit, we 1810 * may not get something to kick us so it COULD 1811 * still take a timeout to move these.. but it can't 1812 * hurt to mark them. 1813 */ 1814 struct sctp_tmit_chunk *chk; 1815 1816 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1817 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1818 chk->sent = SCTP_DATAGRAM_RESEND; 1819 sctp_flight_size_decrease(chk); 1820 sctp_total_flight_decrease(stcb, chk); 1821 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1822 spec_flag++; 1823 } 1824 } 1825 1826 } 1827 /* process the INIT info (peer's info) */ 1828 retval = sctp_process_init(init_cp, stcb); 1829 if (retval < 0) { 1830 if (how_indx < sizeof(asoc->cookie_how)) 1831 asoc->cookie_how[how_indx] = 9; 1832 return (NULL); 1833 } 1834 if (sctp_load_addresses_from_init(stcb, m, 1835 init_offset + sizeof(struct sctp_init_chunk), 1836 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1837 if (how_indx < sizeof(asoc->cookie_how)) 1838 asoc->cookie_how[how_indx] = 10; 1839 return (NULL); 1840 } 1841 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1842 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1843 *notification = SCTP_NOTIFY_ASSOC_UP; 1844 1845 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1846 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1847 (!SCTP_IS_LISTENING(inp))) { 1848 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1849 struct socket *so; 1850 #endif 1851 stcb->sctp_ep->sctp_flags |= 1852 SCTP_PCB_FLAGS_CONNECTED; 1853 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1854 so = SCTP_INP_SO(stcb->sctp_ep); 1855 atomic_add_int(&stcb->asoc.refcnt, 1); 1856 SCTP_TCB_UNLOCK(stcb); 1857 SCTP_SOCKET_LOCK(so, 1); 1858 SCTP_TCB_LOCK(stcb); 1859 atomic_add_int(&stcb->asoc.refcnt, -1); 1860 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1861 SCTP_SOCKET_UNLOCK(so, 1); 1862 return (NULL); 1863 } 1864 #endif 1865 soisconnected(stcb->sctp_socket); 1866 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1867 SCTP_SOCKET_UNLOCK(so, 1); 1868 #endif 1869 } 1870 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1871 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1872 else 1873 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1874 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1875 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1876 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1877 } else { 1878 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1879 } 1880 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1881 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1882 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1883 stcb->sctp_ep, stcb, asoc->primary_destination); 1884 } 1885 sctp_stop_all_cookie_timers(stcb); 1886 sctp_toss_old_cookies(stcb, asoc); 1887 sctp_send_cookie_ack(stcb); 1888 if (spec_flag) { 1889 /* 1890 * only if we have retrans set do we do this. What 1891 * this call does is get only the COOKIE-ACK out and 1892 * then when we return the normal call to 1893 * sctp_chunk_output will get the retrans out behind 1894 * this. 1895 */ 1896 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1897 } 1898 if (how_indx < sizeof(asoc->cookie_how)) 1899 asoc->cookie_how[how_indx] = 11; 1900 1901 return (stcb); 1902 } 1903 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1904 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1905 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1906 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1907 cookie->tie_tag_peer_vtag != 0) { 1908 struct sctpasochead *head; 1909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1910 struct socket *so; 1911 #endif 1912 1913 if (asoc->peer_supports_nat) { 1914 /* 1915 * This is a gross gross hack. Just call the 1916 * cookie_new code since we are allowing a duplicate 1917 * association. I hope this works... 1918 */ 1919 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1920 sh, cookie, cookie_len, 1921 inp, netp, init_src, notification, 1922 auth_skipped, auth_offset, auth_len, 1923 mflowtype, mflowid, 1924 vrf_id, port)); 1925 } 1926 /* 1927 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1928 */ 1929 /* temp code */ 1930 if (how_indx < sizeof(asoc->cookie_how)) 1931 asoc->cookie_how[how_indx] = 12; 1932 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1933 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1934 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1935 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1936 1937 /* notify upper layer */ 1938 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1939 atomic_add_int(&stcb->asoc.refcnt, 1); 1940 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1941 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1942 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1943 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1944 } 1945 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1946 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1947 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1948 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1949 } 1950 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1951 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1952 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1953 stcb->sctp_ep, stcb, asoc->primary_destination); 1954 1955 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1956 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1957 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1958 } 1959 asoc->pre_open_streams = 1960 ntohs(initack_cp->init.num_outbound_streams); 1961 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1962 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1963 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1964 1965 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1966 1967 asoc->str_reset_seq_in = asoc->init_seq_number; 1968 1969 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1970 if (asoc->mapping_array) { 1971 memset(asoc->mapping_array, 0, 1972 asoc->mapping_array_size); 1973 } 1974 if (asoc->nr_mapping_array) { 1975 memset(asoc->nr_mapping_array, 0, 1976 asoc->mapping_array_size); 1977 } 1978 SCTP_TCB_UNLOCK(stcb); 1979 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1980 so = SCTP_INP_SO(stcb->sctp_ep); 1981 SCTP_SOCKET_LOCK(so, 1); 1982 #endif 1983 SCTP_INP_INFO_WLOCK(); 1984 SCTP_INP_WLOCK(stcb->sctp_ep); 1985 SCTP_TCB_LOCK(stcb); 1986 atomic_add_int(&stcb->asoc.refcnt, -1); 1987 /* send up all the data */ 1988 SCTP_TCB_SEND_LOCK(stcb); 1989 1990 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1991 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1992 stcb->asoc.strmout[i].chunks_on_queues = 0; 1993 #if defined(SCTP_DETAILED_STR_STATS) 1994 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1995 asoc->strmout[i].abandoned_sent[j] = 0; 1996 asoc->strmout[i].abandoned_unsent[j] = 0; 1997 } 1998 #else 1999 asoc->strmout[i].abandoned_sent[0] = 0; 2000 asoc->strmout[i].abandoned_unsent[0] = 0; 2001 #endif 2002 stcb->asoc.strmout[i].sid = i; 2003 stcb->asoc.strmout[i].next_mid_ordered = 0; 2004 stcb->asoc.strmout[i].next_mid_unordered = 0; 2005 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2006 } 2007 /* process the INIT-ACK info (my info) */ 2008 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2009 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2010 2011 /* pull from vtag hash */ 2012 LIST_REMOVE(stcb, sctp_asocs); 2013 /* re-insert to new vtag position */ 2014 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2015 SCTP_BASE_INFO(hashasocmark))]; 2016 /* 2017 * put it in the bucket in the vtag hash of assoc's for the 2018 * system 2019 */ 2020 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2021 2022 SCTP_TCB_SEND_UNLOCK(stcb); 2023 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2024 SCTP_INP_INFO_WUNLOCK(); 2025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2026 SCTP_SOCKET_UNLOCK(so, 1); 2027 #endif 2028 asoc->total_flight = 0; 2029 asoc->total_flight_count = 0; 2030 /* process the INIT info (peer's info) */ 2031 retval = sctp_process_init(init_cp, stcb); 2032 if (retval < 0) { 2033 if (how_indx < sizeof(asoc->cookie_how)) 2034 asoc->cookie_how[how_indx] = 13; 2035 2036 return (NULL); 2037 } 2038 /* 2039 * since we did not send a HB make sure we don't double 2040 * things 2041 */ 2042 net->hb_responded = 1; 2043 2044 if (sctp_load_addresses_from_init(stcb, m, 2045 init_offset + sizeof(struct sctp_init_chunk), 2046 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2047 if (how_indx < sizeof(asoc->cookie_how)) 2048 asoc->cookie_how[how_indx] = 14; 2049 2050 return (NULL); 2051 } 2052 /* respond with a COOKIE-ACK */ 2053 sctp_stop_all_cookie_timers(stcb); 2054 sctp_toss_old_cookies(stcb, asoc); 2055 sctp_send_cookie_ack(stcb); 2056 if (how_indx < sizeof(asoc->cookie_how)) 2057 asoc->cookie_how[how_indx] = 15; 2058 2059 return (stcb); 2060 } 2061 if (how_indx < sizeof(asoc->cookie_how)) 2062 asoc->cookie_how[how_indx] = 16; 2063 /* all other cases... */ 2064 return (NULL); 2065 } 2066 2067 2068 /* 2069 * handle a state cookie for a new association m: input packet mbuf chain-- 2070 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2071 * and the cookie signature does not exist offset: offset into mbuf to the 2072 * cookie-echo chunk length: length of the cookie chunk to: where the init 2073 * was from returns a new TCB 2074 */ 2075 static struct sctp_tcb * 2076 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2077 struct sockaddr *src, struct sockaddr *dst, 2078 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2079 struct sctp_inpcb *inp, struct sctp_nets **netp, 2080 struct sockaddr *init_src, int *notification, 2081 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2082 uint8_t mflowtype, uint32_t mflowid, 2083 uint32_t vrf_id, uint16_t port) 2084 { 2085 struct sctp_tcb *stcb; 2086 struct sctp_init_chunk *init_cp, init_buf; 2087 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2088 union sctp_sockstore store; 2089 struct sctp_association *asoc; 2090 int init_offset, initack_offset, initack_limit; 2091 int retval; 2092 int error = 0; 2093 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2094 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2095 struct socket *so; 2096 2097 so = SCTP_INP_SO(inp); 2098 #endif 2099 2100 /* 2101 * find and validate the INIT chunk in the cookie (peer's info) the 2102 * INIT should start after the cookie-echo header struct (chunk 2103 * header, state cookie header struct) 2104 */ 2105 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2106 init_cp = (struct sctp_init_chunk *) 2107 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2108 (uint8_t *)&init_buf); 2109 if (init_cp == NULL) { 2110 /* could not pull a INIT chunk in cookie */ 2111 SCTPDBG(SCTP_DEBUG_INPUT1, 2112 "process_cookie_new: could not pull INIT chunk hdr\n"); 2113 return (NULL); 2114 } 2115 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2116 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2117 return (NULL); 2118 } 2119 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2120 /* 2121 * find and validate the INIT-ACK chunk in the cookie (my info) the 2122 * INIT-ACK follows the INIT chunk 2123 */ 2124 initack_cp = (struct sctp_init_ack_chunk *) 2125 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2126 (uint8_t *)&initack_buf); 2127 if (initack_cp == NULL) { 2128 /* could not pull INIT-ACK chunk in cookie */ 2129 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2130 return (NULL); 2131 } 2132 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2133 return (NULL); 2134 } 2135 /* 2136 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2137 * "initack_limit" value. This is because the chk_length field 2138 * includes the length of the cookie, but the cookie is omitted when 2139 * the INIT and INIT_ACK are tacked onto the cookie... 2140 */ 2141 initack_limit = offset + cookie_len; 2142 2143 /* 2144 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2145 * and popluate 2146 */ 2147 2148 /* 2149 * Here we do a trick, we set in NULL for the proc/thread argument. 2150 * We do this since in effect we only use the p argument when the 2151 * socket is unbound and we must do an implicit bind. Since we are 2152 * getting a cookie, we cannot be unbound. 2153 */ 2154 stcb = sctp_aloc_assoc(inp, init_src, &error, 2155 ntohl(initack_cp->init.initiate_tag), vrf_id, 2156 ntohs(initack_cp->init.num_outbound_streams), 2157 port, 2158 (struct thread *)NULL, 2159 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2160 if (stcb == NULL) { 2161 struct mbuf *op_err; 2162 2163 /* memory problem? */ 2164 SCTPDBG(SCTP_DEBUG_INPUT1, 2165 "process_cookie_new: no room for another TCB!\n"); 2166 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2167 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2168 src, dst, sh, op_err, 2169 mflowtype, mflowid, 2170 vrf_id, port); 2171 return (NULL); 2172 } 2173 /* get the correct sctp_nets */ 2174 if (netp) 2175 *netp = sctp_findnet(stcb, init_src); 2176 2177 asoc = &stcb->asoc; 2178 /* get scope variables out of cookie */ 2179 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2180 asoc->scope.site_scope = cookie->site_scope; 2181 asoc->scope.local_scope = cookie->local_scope; 2182 asoc->scope.loopback_scope = cookie->loopback_scope; 2183 2184 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2185 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2186 struct mbuf *op_err; 2187 2188 /* 2189 * Houston we have a problem. The EP changed while the 2190 * cookie was in flight. Only recourse is to abort the 2191 * association. 2192 */ 2193 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2194 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2195 src, dst, sh, op_err, 2196 mflowtype, mflowid, 2197 vrf_id, port); 2198 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2199 atomic_add_int(&stcb->asoc.refcnt, 1); 2200 SCTP_TCB_UNLOCK(stcb); 2201 SCTP_SOCKET_LOCK(so, 1); 2202 SCTP_TCB_LOCK(stcb); 2203 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2204 #endif 2205 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2206 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2208 SCTP_SOCKET_UNLOCK(so, 1); 2209 #endif 2210 return (NULL); 2211 } 2212 /* process the INIT-ACK info (my info) */ 2213 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2214 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2215 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2216 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2217 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2218 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2219 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2220 asoc->str_reset_seq_in = asoc->init_seq_number; 2221 2222 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2223 2224 /* process the INIT info (peer's info) */ 2225 if (netp) 2226 retval = sctp_process_init(init_cp, stcb); 2227 else 2228 retval = 0; 2229 if (retval < 0) { 2230 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2231 atomic_add_int(&stcb->asoc.refcnt, 1); 2232 SCTP_TCB_UNLOCK(stcb); 2233 SCTP_SOCKET_LOCK(so, 1); 2234 SCTP_TCB_LOCK(stcb); 2235 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2236 #endif 2237 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2238 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2240 SCTP_SOCKET_UNLOCK(so, 1); 2241 #endif 2242 return (NULL); 2243 } 2244 /* load all addresses */ 2245 if (sctp_load_addresses_from_init(stcb, m, 2246 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2247 src, dst, init_src, port)) { 2248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2249 atomic_add_int(&stcb->asoc.refcnt, 1); 2250 SCTP_TCB_UNLOCK(stcb); 2251 SCTP_SOCKET_LOCK(so, 1); 2252 SCTP_TCB_LOCK(stcb); 2253 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2254 #endif 2255 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2256 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2258 SCTP_SOCKET_UNLOCK(so, 1); 2259 #endif 2260 return (NULL); 2261 } 2262 /* 2263 * verify any preceding AUTH chunk that was skipped 2264 */ 2265 /* pull the local authentication parameters from the cookie/init-ack */ 2266 sctp_auth_get_cookie_params(stcb, m, 2267 initack_offset + sizeof(struct sctp_init_ack_chunk), 2268 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2269 if (auth_skipped) { 2270 struct sctp_auth_chunk *auth; 2271 2272 auth = (struct sctp_auth_chunk *) 2273 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2274 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2275 /* auth HMAC failed, dump the assoc and packet */ 2276 SCTPDBG(SCTP_DEBUG_AUTH1, 2277 "COOKIE-ECHO: AUTH failed\n"); 2278 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2279 atomic_add_int(&stcb->asoc.refcnt, 1); 2280 SCTP_TCB_UNLOCK(stcb); 2281 SCTP_SOCKET_LOCK(so, 1); 2282 SCTP_TCB_LOCK(stcb); 2283 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2284 #endif 2285 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2286 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2287 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2288 SCTP_SOCKET_UNLOCK(so, 1); 2289 #endif 2290 return (NULL); 2291 } else { 2292 /* remaining chunks checked... good to go */ 2293 stcb->asoc.authenticated = 1; 2294 } 2295 } 2296 2297 /* 2298 * if we're doing ASCONFs, check to see if we have any new local 2299 * addresses that need to get added to the peer (eg. addresses 2300 * changed while cookie echo in flight). This needs to be done 2301 * after we go to the OPEN state to do the correct asconf 2302 * processing. else, make sure we have the correct addresses in our 2303 * lists 2304 */ 2305 2306 /* warning, we re-use sin, sin6, sa_store here! */ 2307 /* pull in local_address (our "from" address) */ 2308 switch (cookie->laddr_type) { 2309 #ifdef INET 2310 case SCTP_IPV4_ADDRESS: 2311 /* source addr is IPv4 */ 2312 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2313 store.sin.sin_family = AF_INET; 2314 store.sin.sin_len = sizeof(struct sockaddr_in); 2315 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2316 break; 2317 #endif 2318 #ifdef INET6 2319 case SCTP_IPV6_ADDRESS: 2320 /* source addr is IPv6 */ 2321 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2322 store.sin6.sin6_family = AF_INET6; 2323 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2324 store.sin6.sin6_scope_id = cookie->scope_id; 2325 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2326 break; 2327 #endif 2328 default: 2329 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2330 atomic_add_int(&stcb->asoc.refcnt, 1); 2331 SCTP_TCB_UNLOCK(stcb); 2332 SCTP_SOCKET_LOCK(so, 1); 2333 SCTP_TCB_LOCK(stcb); 2334 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2335 #endif 2336 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2337 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2338 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2339 SCTP_SOCKET_UNLOCK(so, 1); 2340 #endif 2341 return (NULL); 2342 } 2343 2344 /* update current state */ 2345 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2346 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2347 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2348 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2349 stcb->sctp_ep, stcb, asoc->primary_destination); 2350 } 2351 sctp_stop_all_cookie_timers(stcb); 2352 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2353 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2354 2355 /* set up to notify upper layer */ 2356 *notification = SCTP_NOTIFY_ASSOC_UP; 2357 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2358 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2359 (!SCTP_IS_LISTENING(inp))) { 2360 /* 2361 * This is an endpoint that called connect() how it got a 2362 * cookie that is NEW is a bit of a mystery. It must be that 2363 * the INIT was sent, but before it got there.. a complete 2364 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2365 * should have went to the other code.. not here.. oh well.. 2366 * a bit of protection is worth having.. 2367 */ 2368 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2369 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2370 atomic_add_int(&stcb->asoc.refcnt, 1); 2371 SCTP_TCB_UNLOCK(stcb); 2372 SCTP_SOCKET_LOCK(so, 1); 2373 SCTP_TCB_LOCK(stcb); 2374 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2375 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2376 SCTP_SOCKET_UNLOCK(so, 1); 2377 return (NULL); 2378 } 2379 #endif 2380 soisconnected(stcb->sctp_socket); 2381 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2382 SCTP_SOCKET_UNLOCK(so, 1); 2383 #endif 2384 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2385 (SCTP_IS_LISTENING(inp))) { 2386 /* 2387 * We don't want to do anything with this one. Since it is 2388 * the listening guy. The timer will get started for 2389 * accepted connections in the caller. 2390 */ 2391 ; 2392 } 2393 /* since we did not send a HB make sure we don't double things */ 2394 if ((netp) && (*netp)) 2395 (*netp)->hb_responded = 1; 2396 2397 if (stcb->asoc.sctp_autoclose_ticks && 2398 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2399 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2400 } 2401 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2402 if ((netp != NULL) && (*netp != NULL)) { 2403 struct timeval old; 2404 2405 /* calculate the RTT and set the encaps port */ 2406 old.tv_sec = cookie->time_entered.tv_sec; 2407 old.tv_usec = cookie->time_entered.tv_usec; 2408 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2409 } 2410 /* respond with a COOKIE-ACK */ 2411 sctp_send_cookie_ack(stcb); 2412 2413 /* 2414 * check the address lists for any ASCONFs that need to be sent 2415 * AFTER the cookie-ack is sent 2416 */ 2417 sctp_check_address_list(stcb, m, 2418 initack_offset + sizeof(struct sctp_init_ack_chunk), 2419 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2420 &store.sa, cookie->local_scope, cookie->site_scope, 2421 cookie->ipv4_scope, cookie->loopback_scope); 2422 2423 2424 return (stcb); 2425 } 2426 2427 /* 2428 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2429 * we NEED to make sure we are not already using the vtag. If so we 2430 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2431 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2432 SCTP_BASE_INFO(hashasocmark))]; 2433 LIST_FOREACH(stcb, head, sctp_asocs) { 2434 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2435 -- SEND ABORT - TRY AGAIN -- 2436 } 2437 } 2438 */ 2439 2440 /* 2441 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2442 * existing (non-NULL) TCB 2443 */ 2444 static struct mbuf * 2445 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2446 struct sockaddr *src, struct sockaddr *dst, 2447 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2448 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2449 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2450 struct sctp_tcb **locked_tcb, 2451 uint8_t mflowtype, uint32_t mflowid, 2452 uint32_t vrf_id, uint16_t port) 2453 { 2454 struct sctp_state_cookie *cookie; 2455 struct sctp_tcb *l_stcb = *stcb; 2456 struct sctp_inpcb *l_inp; 2457 struct sockaddr *to; 2458 struct sctp_pcb *ep; 2459 struct mbuf *m_sig; 2460 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2461 uint8_t *sig; 2462 uint8_t cookie_ok = 0; 2463 unsigned int sig_offset, cookie_offset; 2464 unsigned int cookie_len; 2465 struct timeval now; 2466 struct timeval time_expires; 2467 int notification = 0; 2468 struct sctp_nets *netl; 2469 int had_a_existing_tcb = 0; 2470 int send_int_conf = 0; 2471 #ifdef INET 2472 struct sockaddr_in sin; 2473 #endif 2474 #ifdef INET6 2475 struct sockaddr_in6 sin6; 2476 #endif 2477 2478 SCTPDBG(SCTP_DEBUG_INPUT2, 2479 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2480 2481 if (inp_p == NULL) { 2482 return (NULL); 2483 } 2484 cookie = &cp->cookie; 2485 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2486 cookie_len = ntohs(cp->ch.chunk_length); 2487 2488 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2489 sizeof(struct sctp_init_chunk) + 2490 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2491 /* cookie too small */ 2492 return (NULL); 2493 } 2494 if ((cookie->peerport != sh->src_port) || 2495 (cookie->myport != sh->dest_port) || 2496 (cookie->my_vtag != sh->v_tag)) { 2497 /* 2498 * invalid ports or bad tag. Note that we always leave the 2499 * v_tag in the header in network order and when we stored 2500 * it in the my_vtag slot we also left it in network order. 2501 * This maintains the match even though it may be in the 2502 * opposite byte order of the machine :-> 2503 */ 2504 return (NULL); 2505 } 2506 /* 2507 * split off the signature into its own mbuf (since it should not be 2508 * calculated in the sctp_hmac_m() call). 2509 */ 2510 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2511 m_sig = m_split(m, sig_offset, M_NOWAIT); 2512 if (m_sig == NULL) { 2513 /* out of memory or ?? */ 2514 return (NULL); 2515 } 2516 #ifdef SCTP_MBUF_LOGGING 2517 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2518 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2519 } 2520 #endif 2521 2522 /* 2523 * compute the signature/digest for the cookie 2524 */ 2525 ep = &(*inp_p)->sctp_ep; 2526 l_inp = *inp_p; 2527 if (l_stcb) { 2528 SCTP_TCB_UNLOCK(l_stcb); 2529 } 2530 SCTP_INP_RLOCK(l_inp); 2531 if (l_stcb) { 2532 SCTP_TCB_LOCK(l_stcb); 2533 } 2534 /* which cookie is it? */ 2535 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2536 (ep->current_secret_number != ep->last_secret_number)) { 2537 /* it's the old cookie */ 2538 (void)sctp_hmac_m(SCTP_HMAC, 2539 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2540 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2541 } else { 2542 /* it's the current cookie */ 2543 (void)sctp_hmac_m(SCTP_HMAC, 2544 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2545 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2546 } 2547 /* get the signature */ 2548 SCTP_INP_RUNLOCK(l_inp); 2549 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2550 if (sig == NULL) { 2551 /* couldn't find signature */ 2552 sctp_m_freem(m_sig); 2553 return (NULL); 2554 } 2555 /* compare the received digest with the computed digest */ 2556 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2557 /* try the old cookie? */ 2558 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2559 (ep->current_secret_number != ep->last_secret_number)) { 2560 /* compute digest with old */ 2561 (void)sctp_hmac_m(SCTP_HMAC, 2562 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2563 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2564 /* compare */ 2565 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2566 cookie_ok = 1; 2567 } 2568 } else { 2569 cookie_ok = 1; 2570 } 2571 2572 /* 2573 * Now before we continue we must reconstruct our mbuf so that 2574 * normal processing of any other chunks will work. 2575 */ 2576 { 2577 struct mbuf *m_at; 2578 2579 m_at = m; 2580 while (SCTP_BUF_NEXT(m_at) != NULL) { 2581 m_at = SCTP_BUF_NEXT(m_at); 2582 } 2583 SCTP_BUF_NEXT(m_at) = m_sig; 2584 } 2585 2586 if (cookie_ok == 0) { 2587 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2588 SCTPDBG(SCTP_DEBUG_INPUT2, 2589 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2590 (uint32_t)offset, cookie_offset, sig_offset); 2591 return (NULL); 2592 } 2593 2594 /* 2595 * check the cookie timestamps to be sure it's not stale 2596 */ 2597 (void)SCTP_GETTIME_TIMEVAL(&now); 2598 /* Expire time is in Ticks, so we convert to seconds */ 2599 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2600 time_expires.tv_usec = cookie->time_entered.tv_usec; 2601 if (timevalcmp(&now, &time_expires, >)) { 2602 /* cookie is stale! */ 2603 struct mbuf *op_err; 2604 struct sctp_error_stale_cookie *cause; 2605 struct timeval diff; 2606 uint32_t staleness; 2607 2608 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2609 0, M_NOWAIT, 1, MT_DATA); 2610 if (op_err == NULL) { 2611 /* FOOBAR */ 2612 return (NULL); 2613 } 2614 /* Set the len */ 2615 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2616 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2617 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2618 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2619 (sizeof(uint32_t)))); 2620 diff = now; 2621 timevalsub(&diff, &time_expires); 2622 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2623 staleness = UINT32_MAX; 2624 } else { 2625 staleness = diff.tv_sec * 1000000; 2626 } 2627 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2628 staleness += diff.tv_usec; 2629 } else { 2630 staleness = UINT32_MAX; 2631 } 2632 cause->stale_time = htonl(staleness); 2633 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2634 mflowtype, mflowid, l_inp->fibnum, 2635 vrf_id, port); 2636 return (NULL); 2637 } 2638 /* 2639 * Now we must see with the lookup address if we have an existing 2640 * asoc. This will only happen if we were in the COOKIE-WAIT state 2641 * and a INIT collided with us and somewhere the peer sent the 2642 * cookie on another address besides the single address our assoc 2643 * had for him. In this case we will have one of the tie-tags set at 2644 * least AND the address field in the cookie can be used to look it 2645 * up. 2646 */ 2647 to = NULL; 2648 switch (cookie->addr_type) { 2649 #ifdef INET6 2650 case SCTP_IPV6_ADDRESS: 2651 memset(&sin6, 0, sizeof(sin6)); 2652 sin6.sin6_family = AF_INET6; 2653 sin6.sin6_len = sizeof(sin6); 2654 sin6.sin6_port = sh->src_port; 2655 sin6.sin6_scope_id = cookie->scope_id; 2656 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2657 sizeof(sin6.sin6_addr.s6_addr)); 2658 to = (struct sockaddr *)&sin6; 2659 break; 2660 #endif 2661 #ifdef INET 2662 case SCTP_IPV4_ADDRESS: 2663 memset(&sin, 0, sizeof(sin)); 2664 sin.sin_family = AF_INET; 2665 sin.sin_len = sizeof(sin); 2666 sin.sin_port = sh->src_port; 2667 sin.sin_addr.s_addr = cookie->address[0]; 2668 to = (struct sockaddr *)&sin; 2669 break; 2670 #endif 2671 default: 2672 /* This should not happen */ 2673 return (NULL); 2674 } 2675 if (*stcb == NULL) { 2676 /* Yep, lets check */ 2677 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2678 if (*stcb == NULL) { 2679 /* 2680 * We should have only got back the same inp. If we 2681 * got back a different ep we have a problem. The 2682 * original findep got back l_inp and now 2683 */ 2684 if (l_inp != *inp_p) { 2685 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2686 } 2687 } else { 2688 if (*locked_tcb == NULL) { 2689 /* 2690 * In this case we found the assoc only 2691 * after we locked the create lock. This 2692 * means we are in a colliding case and we 2693 * must make sure that we unlock the tcb if 2694 * its one of the cases where we throw away 2695 * the incoming packets. 2696 */ 2697 *locked_tcb = *stcb; 2698 2699 /* 2700 * We must also increment the inp ref count 2701 * since the ref_count flags was set when we 2702 * did not find the TCB, now we found it 2703 * which reduces the refcount.. we must 2704 * raise it back out to balance it all :-) 2705 */ 2706 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2707 if ((*stcb)->sctp_ep != l_inp) { 2708 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2709 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2710 } 2711 } 2712 } 2713 } 2714 2715 cookie_len -= SCTP_SIGNATURE_SIZE; 2716 if (*stcb == NULL) { 2717 /* this is the "normal" case... get a new TCB */ 2718 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2719 cookie, cookie_len, *inp_p, 2720 netp, to, ¬ification, 2721 auth_skipped, auth_offset, auth_len, 2722 mflowtype, mflowid, 2723 vrf_id, port); 2724 } else { 2725 /* this is abnormal... cookie-echo on existing TCB */ 2726 had_a_existing_tcb = 1; 2727 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2728 src, dst, sh, 2729 cookie, cookie_len, *inp_p, *stcb, netp, to, 2730 ¬ification, auth_skipped, auth_offset, auth_len, 2731 mflowtype, mflowid, 2732 vrf_id, port); 2733 } 2734 2735 if (*stcb == NULL) { 2736 /* still no TCB... must be bad cookie-echo */ 2737 return (NULL); 2738 } 2739 if (*netp != NULL) { 2740 (*netp)->flowtype = mflowtype; 2741 (*netp)->flowid = mflowid; 2742 } 2743 /* 2744 * Ok, we built an association so confirm the address we sent the 2745 * INIT-ACK to. 2746 */ 2747 netl = sctp_findnet(*stcb, to); 2748 /* 2749 * This code should in theory NOT run but 2750 */ 2751 if (netl == NULL) { 2752 /* TSNH! Huh, why do I need to add this address here? */ 2753 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2754 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2755 return (NULL); 2756 } 2757 netl = sctp_findnet(*stcb, to); 2758 } 2759 if (netl) { 2760 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2761 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2762 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2763 netl); 2764 send_int_conf = 1; 2765 } 2766 } 2767 sctp_start_net_timers(*stcb); 2768 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2769 if (!had_a_existing_tcb || 2770 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2771 /* 2772 * If we have a NEW cookie or the connect never 2773 * reached the connected state during collision we 2774 * must do the TCP accept thing. 2775 */ 2776 struct socket *so, *oso; 2777 struct sctp_inpcb *inp; 2778 2779 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2780 /* 2781 * For a restart we will keep the same 2782 * socket, no need to do anything. I THINK!! 2783 */ 2784 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2785 if (send_int_conf) { 2786 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2787 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2788 } 2789 return (m); 2790 } 2791 oso = (*inp_p)->sctp_socket; 2792 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2793 SCTP_TCB_UNLOCK((*stcb)); 2794 CURVNET_SET(oso->so_vnet); 2795 so = sonewconn(oso, 0 2796 ); 2797 CURVNET_RESTORE(); 2798 SCTP_TCB_LOCK((*stcb)); 2799 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2800 2801 if (so == NULL) { 2802 struct mbuf *op_err; 2803 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2804 struct socket *pcb_so; 2805 #endif 2806 /* Too many sockets */ 2807 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2808 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2809 sctp_abort_association(*inp_p, NULL, m, iphlen, 2810 src, dst, sh, op_err, 2811 mflowtype, mflowid, 2812 vrf_id, port); 2813 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2814 pcb_so = SCTP_INP_SO(*inp_p); 2815 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2816 SCTP_TCB_UNLOCK((*stcb)); 2817 SCTP_SOCKET_LOCK(pcb_so, 1); 2818 SCTP_TCB_LOCK((*stcb)); 2819 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2820 #endif 2821 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2822 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2823 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2824 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2825 #endif 2826 return (NULL); 2827 } 2828 inp = (struct sctp_inpcb *)so->so_pcb; 2829 SCTP_INP_INCR_REF(inp); 2830 /* 2831 * We add the unbound flag here so that if we get an 2832 * soabort() before we get the move_pcb done, we 2833 * will properly cleanup. 2834 */ 2835 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2836 SCTP_PCB_FLAGS_CONNECTED | 2837 SCTP_PCB_FLAGS_IN_TCPPOOL | 2838 SCTP_PCB_FLAGS_UNBOUND | 2839 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2840 SCTP_PCB_FLAGS_DONT_WAKE); 2841 inp->sctp_features = (*inp_p)->sctp_features; 2842 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2843 inp->sctp_socket = so; 2844 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2845 inp->max_cwnd = (*inp_p)->max_cwnd; 2846 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2847 inp->ecn_supported = (*inp_p)->ecn_supported; 2848 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2849 inp->auth_supported = (*inp_p)->auth_supported; 2850 inp->asconf_supported = (*inp_p)->asconf_supported; 2851 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2852 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2853 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2854 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2855 inp->sctp_context = (*inp_p)->sctp_context; 2856 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2857 inp->fibnum = (*inp_p)->fibnum; 2858 inp->inp_starting_point_for_iterator = NULL; 2859 /* 2860 * copy in the authentication parameters from the 2861 * original endpoint 2862 */ 2863 if (inp->sctp_ep.local_hmacs) 2864 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2865 inp->sctp_ep.local_hmacs = 2866 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2867 if (inp->sctp_ep.local_auth_chunks) 2868 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2869 inp->sctp_ep.local_auth_chunks = 2870 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2871 2872 /* 2873 * Now we must move it from one hash table to 2874 * another and get the tcb in the right place. 2875 */ 2876 2877 /* 2878 * This is where the one-2-one socket is put into 2879 * the accept state waiting for the accept! 2880 */ 2881 if (*stcb) { 2882 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2883 } 2884 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2885 2886 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2887 SCTP_TCB_UNLOCK((*stcb)); 2888 2889 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2890 0); 2891 SCTP_TCB_LOCK((*stcb)); 2892 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2893 2894 2895 /* 2896 * now we must check to see if we were aborted while 2897 * the move was going on and the lock/unlock 2898 * happened. 2899 */ 2900 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2901 /* 2902 * yep it was, we leave the assoc attached 2903 * to the socket since the sctp_inpcb_free() 2904 * call will send an abort for us. 2905 */ 2906 SCTP_INP_DECR_REF(inp); 2907 return (NULL); 2908 } 2909 SCTP_INP_DECR_REF(inp); 2910 /* Switch over to the new guy */ 2911 *inp_p = inp; 2912 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2913 if (send_int_conf) { 2914 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2915 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2916 } 2917 2918 /* 2919 * Pull it from the incomplete queue and wake the 2920 * guy 2921 */ 2922 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2923 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2924 SCTP_TCB_UNLOCK((*stcb)); 2925 SCTP_SOCKET_LOCK(so, 1); 2926 #endif 2927 soisconnected(so); 2928 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2929 SCTP_TCB_LOCK((*stcb)); 2930 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2931 SCTP_SOCKET_UNLOCK(so, 1); 2932 #endif 2933 return (m); 2934 } 2935 } 2936 if (notification) { 2937 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2938 } 2939 if (send_int_conf) { 2940 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2941 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2942 } 2943 return (m); 2944 } 2945 2946 static void 2947 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2948 struct sctp_tcb *stcb, struct sctp_nets *net) 2949 { 2950 /* cp must not be used, others call this without a c-ack :-) */ 2951 struct sctp_association *asoc; 2952 2953 SCTPDBG(SCTP_DEBUG_INPUT2, 2954 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2955 if ((stcb == NULL) || (net == NULL)) { 2956 return; 2957 } 2958 2959 asoc = &stcb->asoc; 2960 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2961 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2962 asoc->overall_error_count, 2963 0, 2964 SCTP_FROM_SCTP_INPUT, 2965 __LINE__); 2966 } 2967 asoc->overall_error_count = 0; 2968 sctp_stop_all_cookie_timers(stcb); 2969 /* process according to association state */ 2970 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2971 /* state change only needed when I am in right state */ 2972 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2973 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2974 sctp_start_net_timers(stcb); 2975 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2976 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2977 stcb->sctp_ep, stcb, asoc->primary_destination); 2978 2979 } 2980 /* update RTO */ 2981 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2982 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2983 if (asoc->overall_error_count == 0) { 2984 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2985 SCTP_RTT_FROM_NON_DATA); 2986 } 2987 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2988 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2989 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2990 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2991 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2992 struct socket *so; 2993 2994 #endif 2995 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2996 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2997 so = SCTP_INP_SO(stcb->sctp_ep); 2998 atomic_add_int(&stcb->asoc.refcnt, 1); 2999 SCTP_TCB_UNLOCK(stcb); 3000 SCTP_SOCKET_LOCK(so, 1); 3001 SCTP_TCB_LOCK(stcb); 3002 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3003 #endif 3004 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3005 soisconnected(stcb->sctp_socket); 3006 } 3007 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3008 SCTP_SOCKET_UNLOCK(so, 1); 3009 #endif 3010 } 3011 /* 3012 * since we did not send a HB make sure we don't double 3013 * things 3014 */ 3015 net->hb_responded = 1; 3016 3017 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3018 /* 3019 * We don't need to do the asconf thing, nor hb or 3020 * autoclose if the socket is closed. 3021 */ 3022 goto closed_socket; 3023 } 3024 3025 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3026 stcb, net); 3027 3028 3029 if (stcb->asoc.sctp_autoclose_ticks && 3030 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3031 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3032 stcb->sctp_ep, stcb, NULL); 3033 } 3034 /* 3035 * send ASCONF if parameters are pending and ASCONFs are 3036 * allowed (eg. addresses changed when init/cookie echo were 3037 * in flight) 3038 */ 3039 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3040 (stcb->asoc.asconf_supported == 1) && 3041 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3042 #ifdef SCTP_TIMER_BASED_ASCONF 3043 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3044 stcb->sctp_ep, stcb, 3045 stcb->asoc.primary_destination); 3046 #else 3047 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3048 SCTP_ADDR_NOT_LOCKED); 3049 #endif 3050 } 3051 } 3052 closed_socket: 3053 /* Toss the cookie if I can */ 3054 sctp_toss_old_cookies(stcb, asoc); 3055 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3056 /* Restart the timer if we have pending data */ 3057 struct sctp_tmit_chunk *chk; 3058 3059 chk = TAILQ_FIRST(&asoc->sent_queue); 3060 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3061 } 3062 } 3063 3064 static void 3065 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3066 struct sctp_tcb *stcb) 3067 { 3068 struct sctp_nets *net; 3069 struct sctp_tmit_chunk *lchk; 3070 struct sctp_ecne_chunk bkup; 3071 uint8_t override_bit; 3072 uint32_t tsn, window_data_tsn; 3073 int len; 3074 unsigned int pkt_cnt; 3075 3076 len = ntohs(cp->ch.chunk_length); 3077 if ((len != sizeof(struct sctp_ecne_chunk)) && 3078 (len != sizeof(struct old_sctp_ecne_chunk))) { 3079 return; 3080 } 3081 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3082 /* Its the old format */ 3083 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3084 bkup.num_pkts_since_cwr = htonl(1); 3085 cp = &bkup; 3086 } 3087 SCTP_STAT_INCR(sctps_recvecne); 3088 tsn = ntohl(cp->tsn); 3089 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3090 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3091 if (lchk == NULL) { 3092 window_data_tsn = stcb->asoc.sending_seq - 1; 3093 } else { 3094 window_data_tsn = lchk->rec.data.tsn; 3095 } 3096 3097 /* Find where it was sent to if possible. */ 3098 net = NULL; 3099 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3100 if (lchk->rec.data.tsn == tsn) { 3101 net = lchk->whoTo; 3102 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3103 break; 3104 } 3105 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3106 break; 3107 } 3108 } 3109 if (net == NULL) { 3110 /* 3111 * What to do. A previous send of a CWR was possibly lost. 3112 * See how old it is, we may have it marked on the actual 3113 * net. 3114 */ 3115 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3116 if (tsn == net->last_cwr_tsn) { 3117 /* Found him, send it off */ 3118 break; 3119 } 3120 } 3121 if (net == NULL) { 3122 /* 3123 * If we reach here, we need to send a special CWR 3124 * that says hey, we did this a long time ago and 3125 * you lost the response. 3126 */ 3127 net = TAILQ_FIRST(&stcb->asoc.nets); 3128 if (net == NULL) { 3129 /* TSNH */ 3130 return; 3131 } 3132 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3133 } else { 3134 override_bit = 0; 3135 } 3136 } else { 3137 override_bit = 0; 3138 } 3139 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3140 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3141 /* 3142 * JRS - Use the congestion control given in the pluggable 3143 * CC module 3144 */ 3145 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3146 /* 3147 * We reduce once every RTT. So we will only lower cwnd at 3148 * the next sending seq i.e. the window_data_tsn 3149 */ 3150 net->cwr_window_tsn = window_data_tsn; 3151 net->ecn_ce_pkt_cnt += pkt_cnt; 3152 net->lost_cnt = pkt_cnt; 3153 net->last_cwr_tsn = tsn; 3154 } else { 3155 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3156 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3157 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3158 /* 3159 * Another loss in the same window update how many 3160 * marks/packets lost we have had. 3161 */ 3162 int cnt = 1; 3163 3164 if (pkt_cnt > net->lost_cnt) { 3165 /* Should be the case */ 3166 cnt = (pkt_cnt - net->lost_cnt); 3167 net->ecn_ce_pkt_cnt += cnt; 3168 } 3169 net->lost_cnt = pkt_cnt; 3170 net->last_cwr_tsn = tsn; 3171 /* 3172 * Most CC functions will ignore this call, since we 3173 * are in-window yet of the initial CE the peer saw. 3174 */ 3175 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3176 } 3177 } 3178 /* 3179 * We always send a CWR this way if our previous one was lost our 3180 * peer will get an update, or if it is not time again to reduce we 3181 * still get the cwr to the peer. Note we set the override when we 3182 * could not find the TSN on the chunk or the destination network. 3183 */ 3184 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3185 } 3186 3187 static void 3188 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3189 { 3190 /* 3191 * Here we get a CWR from the peer. We must look in the outqueue and 3192 * make sure that we have a covered ECNE in the control chunk part. 3193 * If so remove it. 3194 */ 3195 struct sctp_tmit_chunk *chk, *nchk; 3196 struct sctp_ecne_chunk *ecne; 3197 int override; 3198 uint32_t cwr_tsn; 3199 3200 cwr_tsn = ntohl(cp->tsn); 3201 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3202 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3203 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3204 continue; 3205 } 3206 if ((override == 0) && (chk->whoTo != net)) { 3207 /* Must be from the right src unless override is set */ 3208 continue; 3209 } 3210 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3211 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3212 /* this covers this ECNE, we can remove it */ 3213 stcb->asoc.ecn_echo_cnt_onq--; 3214 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3215 sctp_next); 3216 stcb->asoc.ctrl_queue_cnt--; 3217 sctp_m_freem(chk->data); 3218 chk->data = NULL; 3219 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3220 if (override == 0) { 3221 break; 3222 } 3223 } 3224 } 3225 } 3226 3227 static void 3228 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3229 struct sctp_tcb *stcb, struct sctp_nets *net) 3230 { 3231 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3232 struct socket *so; 3233 #endif 3234 3235 SCTPDBG(SCTP_DEBUG_INPUT2, 3236 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3237 if (stcb == NULL) 3238 return; 3239 3240 /* process according to association state */ 3241 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3242 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3243 SCTPDBG(SCTP_DEBUG_INPUT2, 3244 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3245 SCTP_TCB_UNLOCK(stcb); 3246 return; 3247 } 3248 /* notify upper layer protocol */ 3249 if (stcb->sctp_socket) { 3250 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3251 } 3252 #ifdef INVARIANTS 3253 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3254 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3255 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3256 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3257 } 3258 #endif 3259 /* stop the timer */ 3260 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3261 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3262 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3263 /* free the TCB */ 3264 SCTPDBG(SCTP_DEBUG_INPUT2, 3265 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3266 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3267 so = SCTP_INP_SO(stcb->sctp_ep); 3268 atomic_add_int(&stcb->asoc.refcnt, 1); 3269 SCTP_TCB_UNLOCK(stcb); 3270 SCTP_SOCKET_LOCK(so, 1); 3271 SCTP_TCB_LOCK(stcb); 3272 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3273 #endif 3274 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3275 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3276 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3277 SCTP_SOCKET_UNLOCK(so, 1); 3278 #endif 3279 return; 3280 } 3281 3282 static int 3283 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3284 struct sctp_nets *net, uint8_t flg) 3285 { 3286 switch (desc->chunk_type) { 3287 case SCTP_DATA: 3288 /* find the tsn to resend (possibly */ 3289 { 3290 uint32_t tsn; 3291 struct sctp_tmit_chunk *tp1; 3292 3293 tsn = ntohl(desc->tsn_ifany); 3294 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3295 if (tp1->rec.data.tsn == tsn) { 3296 /* found it */ 3297 break; 3298 } 3299 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3300 /* not found */ 3301 tp1 = NULL; 3302 break; 3303 } 3304 } 3305 if (tp1 == NULL) { 3306 /* 3307 * Do it the other way , aka without paying 3308 * attention to queue seq order. 3309 */ 3310 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3311 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3312 if (tp1->rec.data.tsn == tsn) { 3313 /* found it */ 3314 break; 3315 } 3316 } 3317 } 3318 if (tp1 == NULL) { 3319 SCTP_STAT_INCR(sctps_pdrptsnnf); 3320 } 3321 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3322 uint8_t *ddp; 3323 3324 if (((flg & SCTP_BADCRC) == 0) && 3325 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3326 return (0); 3327 } 3328 if ((stcb->asoc.peers_rwnd == 0) && 3329 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3330 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3331 return (0); 3332 } 3333 if (stcb->asoc.peers_rwnd == 0 && 3334 (flg & SCTP_FROM_MIDDLE_BOX)) { 3335 SCTP_STAT_INCR(sctps_pdrpdizrw); 3336 return (0); 3337 } 3338 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3339 sizeof(struct sctp_data_chunk)); 3340 { 3341 unsigned int iii; 3342 3343 for (iii = 0; iii < sizeof(desc->data_bytes); 3344 iii++) { 3345 if (ddp[iii] != desc->data_bytes[iii]) { 3346 SCTP_STAT_INCR(sctps_pdrpbadd); 3347 return (-1); 3348 } 3349 } 3350 } 3351 3352 if (tp1->do_rtt) { 3353 /* 3354 * this guy had a RTO calculation 3355 * pending on it, cancel it 3356 */ 3357 if (tp1->whoTo->rto_needed == 0) { 3358 tp1->whoTo->rto_needed = 1; 3359 } 3360 tp1->do_rtt = 0; 3361 } 3362 SCTP_STAT_INCR(sctps_pdrpmark); 3363 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3364 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3365 /* 3366 * mark it as if we were doing a FR, since 3367 * we will be getting gap ack reports behind 3368 * the info from the router. 3369 */ 3370 tp1->rec.data.doing_fast_retransmit = 1; 3371 /* 3372 * mark the tsn with what sequences can 3373 * cause a new FR. 3374 */ 3375 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3376 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3377 } else { 3378 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3379 } 3380 3381 /* restart the timer */ 3382 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3383 stcb, tp1->whoTo, 3384 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3385 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3386 stcb, tp1->whoTo); 3387 3388 /* fix counts and things */ 3389 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3390 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3391 tp1->whoTo->flight_size, 3392 tp1->book_size, 3393 (uint32_t)(uintptr_t)stcb, 3394 tp1->rec.data.tsn); 3395 } 3396 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3397 sctp_flight_size_decrease(tp1); 3398 sctp_total_flight_decrease(stcb, tp1); 3399 } 3400 tp1->sent = SCTP_DATAGRAM_RESEND; 3401 } { 3402 /* audit code */ 3403 unsigned int audit; 3404 3405 audit = 0; 3406 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3407 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3408 audit++; 3409 } 3410 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3411 sctp_next) { 3412 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3413 audit++; 3414 } 3415 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3416 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3417 audit, stcb->asoc.sent_queue_retran_cnt); 3418 #ifndef SCTP_AUDITING_ENABLED 3419 stcb->asoc.sent_queue_retran_cnt = audit; 3420 #endif 3421 } 3422 } 3423 } 3424 break; 3425 case SCTP_ASCONF: 3426 { 3427 struct sctp_tmit_chunk *asconf; 3428 3429 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3430 sctp_next) { 3431 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3432 break; 3433 } 3434 } 3435 if (asconf) { 3436 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3437 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3438 asconf->sent = SCTP_DATAGRAM_RESEND; 3439 asconf->snd_count--; 3440 } 3441 } 3442 break; 3443 case SCTP_INITIATION: 3444 /* resend the INIT */ 3445 stcb->asoc.dropped_special_cnt++; 3446 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3447 /* 3448 * If we can get it in, in a few attempts we do 3449 * this, otherwise we let the timer fire. 3450 */ 3451 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3452 stcb, net, 3453 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3454 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3455 } 3456 break; 3457 case SCTP_SELECTIVE_ACK: 3458 case SCTP_NR_SELECTIVE_ACK: 3459 /* resend the sack */ 3460 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3461 break; 3462 case SCTP_HEARTBEAT_REQUEST: 3463 /* resend a demand HB */ 3464 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3465 /* 3466 * Only retransmit if we KNOW we wont destroy the 3467 * tcb 3468 */ 3469 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3470 } 3471 break; 3472 case SCTP_SHUTDOWN: 3473 sctp_send_shutdown(stcb, net); 3474 break; 3475 case SCTP_SHUTDOWN_ACK: 3476 sctp_send_shutdown_ack(stcb, net); 3477 break; 3478 case SCTP_COOKIE_ECHO: 3479 { 3480 struct sctp_tmit_chunk *cookie; 3481 3482 cookie = NULL; 3483 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3484 sctp_next) { 3485 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3486 break; 3487 } 3488 } 3489 if (cookie) { 3490 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3491 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3492 cookie->sent = SCTP_DATAGRAM_RESEND; 3493 sctp_stop_all_cookie_timers(stcb); 3494 } 3495 } 3496 break; 3497 case SCTP_COOKIE_ACK: 3498 sctp_send_cookie_ack(stcb); 3499 break; 3500 case SCTP_ASCONF_ACK: 3501 /* resend last asconf ack */ 3502 sctp_send_asconf_ack(stcb); 3503 break; 3504 case SCTP_IFORWARD_CUM_TSN: 3505 case SCTP_FORWARD_CUM_TSN: 3506 send_forward_tsn(stcb, &stcb->asoc); 3507 break; 3508 /* can't do anything with these */ 3509 case SCTP_PACKET_DROPPED: 3510 case SCTP_INITIATION_ACK: /* this should not happen */ 3511 case SCTP_HEARTBEAT_ACK: 3512 case SCTP_ABORT_ASSOCIATION: 3513 case SCTP_OPERATION_ERROR: 3514 case SCTP_SHUTDOWN_COMPLETE: 3515 case SCTP_ECN_ECHO: 3516 case SCTP_ECN_CWR: 3517 default: 3518 break; 3519 } 3520 return (0); 3521 } 3522 3523 void 3524 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3525 { 3526 uint32_t i; 3527 uint16_t temp; 3528 3529 /* 3530 * We set things to 0xffffffff since this is the last delivered 3531 * sequence and we will be sending in 0 after the reset. 3532 */ 3533 3534 if (number_entries) { 3535 for (i = 0; i < number_entries; i++) { 3536 temp = ntohs(list[i]); 3537 if (temp >= stcb->asoc.streamincnt) { 3538 continue; 3539 } 3540 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3541 } 3542 } else { 3543 list = NULL; 3544 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3545 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3546 } 3547 } 3548 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3549 } 3550 3551 static void 3552 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3553 { 3554 uint32_t i; 3555 uint16_t temp; 3556 3557 if (number_entries > 0) { 3558 for (i = 0; i < number_entries; i++) { 3559 temp = ntohs(list[i]); 3560 if (temp >= stcb->asoc.streamoutcnt) { 3561 /* no such stream */ 3562 continue; 3563 } 3564 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3565 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3566 } 3567 } else { 3568 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3569 stcb->asoc.strmout[i].next_mid_ordered = 0; 3570 stcb->asoc.strmout[i].next_mid_unordered = 0; 3571 } 3572 } 3573 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3574 } 3575 3576 static void 3577 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3578 { 3579 uint32_t i; 3580 uint16_t temp; 3581 3582 if (number_entries > 0) { 3583 for (i = 0; i < number_entries; i++) { 3584 temp = ntohs(list[i]); 3585 if (temp >= stcb->asoc.streamoutcnt) { 3586 /* no such stream */ 3587 continue; 3588 } 3589 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3590 } 3591 } else { 3592 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3593 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3594 } 3595 } 3596 } 3597 3598 3599 struct sctp_stream_reset_request * 3600 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3601 { 3602 struct sctp_association *asoc; 3603 struct sctp_chunkhdr *ch; 3604 struct sctp_stream_reset_request *r; 3605 struct sctp_tmit_chunk *chk; 3606 int len, clen; 3607 3608 asoc = &stcb->asoc; 3609 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3610 asoc->stream_reset_outstanding = 0; 3611 return (NULL); 3612 } 3613 if (stcb->asoc.str_reset == NULL) { 3614 asoc->stream_reset_outstanding = 0; 3615 return (NULL); 3616 } 3617 chk = stcb->asoc.str_reset; 3618 if (chk->data == NULL) { 3619 return (NULL); 3620 } 3621 if (bchk) { 3622 /* he wants a copy of the chk pointer */ 3623 *bchk = chk; 3624 } 3625 clen = chk->send_size; 3626 ch = mtod(chk->data, struct sctp_chunkhdr *); 3627 r = (struct sctp_stream_reset_request *)(ch + 1); 3628 if (ntohl(r->request_seq) == seq) { 3629 /* found it */ 3630 return (r); 3631 } 3632 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3633 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3634 /* move to the next one, there can only be a max of two */ 3635 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3636 if (ntohl(r->request_seq) == seq) { 3637 return (r); 3638 } 3639 } 3640 /* that seq is not here */ 3641 return (NULL); 3642 } 3643 3644 static void 3645 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3646 { 3647 struct sctp_association *asoc; 3648 struct sctp_tmit_chunk *chk; 3649 3650 asoc = &stcb->asoc; 3651 chk = asoc->str_reset; 3652 if (chk == NULL) { 3653 return; 3654 } 3655 asoc->str_reset = NULL; 3656 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3657 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3658 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3659 asoc->ctrl_queue_cnt--; 3660 if (chk->data) { 3661 sctp_m_freem(chk->data); 3662 chk->data = NULL; 3663 } 3664 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3665 } 3666 3667 3668 static int 3669 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3670 uint32_t seq, uint32_t action, 3671 struct sctp_stream_reset_response *respin) 3672 { 3673 uint16_t type; 3674 int lparam_len; 3675 struct sctp_association *asoc = &stcb->asoc; 3676 struct sctp_tmit_chunk *chk; 3677 struct sctp_stream_reset_request *req_param; 3678 struct sctp_stream_reset_out_request *req_out_param; 3679 struct sctp_stream_reset_in_request *req_in_param; 3680 uint32_t number_entries; 3681 3682 if (asoc->stream_reset_outstanding == 0) { 3683 /* duplicate */ 3684 return (0); 3685 } 3686 if (seq == stcb->asoc.str_reset_seq_out) { 3687 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3688 if (req_param != NULL) { 3689 stcb->asoc.str_reset_seq_out++; 3690 type = ntohs(req_param->ph.param_type); 3691 lparam_len = ntohs(req_param->ph.param_length); 3692 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3693 int no_clear = 0; 3694 3695 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3696 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3697 asoc->stream_reset_out_is_outstanding = 0; 3698 if (asoc->stream_reset_outstanding) 3699 asoc->stream_reset_outstanding--; 3700 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3701 /* do it */ 3702 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3703 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3704 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3705 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3706 /* 3707 * Set it up so we don't stop 3708 * retransmitting 3709 */ 3710 asoc->stream_reset_outstanding++; 3711 stcb->asoc.str_reset_seq_out--; 3712 asoc->stream_reset_out_is_outstanding = 1; 3713 no_clear = 1; 3714 } else { 3715 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3716 } 3717 if (no_clear == 0) { 3718 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3719 } 3720 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3721 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3722 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3723 if (asoc->stream_reset_outstanding) 3724 asoc->stream_reset_outstanding--; 3725 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3726 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3727 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3728 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3729 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3730 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3731 } 3732 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3733 /* Ok we now may have more streams */ 3734 int num_stream; 3735 3736 num_stream = stcb->asoc.strm_pending_add_size; 3737 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3738 /* TSNH */ 3739 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3740 } 3741 stcb->asoc.strm_pending_add_size = 0; 3742 if (asoc->stream_reset_outstanding) 3743 asoc->stream_reset_outstanding--; 3744 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3745 /* Put the new streams into effect */ 3746 int i; 3747 3748 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3749 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3750 } 3751 asoc->streamoutcnt += num_stream; 3752 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3753 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3754 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3755 SCTP_STREAM_CHANGE_DENIED); 3756 } else { 3757 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3758 SCTP_STREAM_CHANGE_FAILED); 3759 } 3760 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3761 if (asoc->stream_reset_outstanding) 3762 asoc->stream_reset_outstanding--; 3763 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3764 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3765 SCTP_STREAM_CHANGE_DENIED); 3766 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3767 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3768 SCTP_STREAM_CHANGE_FAILED); 3769 } 3770 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3771 /** 3772 * a) Adopt the new in tsn. 3773 * b) reset the map 3774 * c) Adopt the new out-tsn 3775 */ 3776 struct sctp_stream_reset_response_tsn *resp; 3777 struct sctp_forward_tsn_chunk fwdtsn; 3778 int abort_flag = 0; 3779 3780 if (respin == NULL) { 3781 /* huh ? */ 3782 return (0); 3783 } 3784 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3785 return (0); 3786 } 3787 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3788 resp = (struct sctp_stream_reset_response_tsn *)respin; 3789 asoc->stream_reset_outstanding--; 3790 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3791 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3792 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3793 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3794 if (abort_flag) { 3795 return (1); 3796 } 3797 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3798 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3799 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3800 } 3801 3802 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3803 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3804 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3805 3806 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3807 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3808 3809 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3810 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3811 3812 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3813 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3814 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3815 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3816 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3817 SCTP_ASSOC_RESET_DENIED); 3818 } else { 3819 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3820 SCTP_ASSOC_RESET_FAILED); 3821 } 3822 } 3823 /* get rid of the request and get the request flags */ 3824 if (asoc->stream_reset_outstanding == 0) { 3825 sctp_clean_up_stream_reset(stcb); 3826 } 3827 } 3828 } 3829 if (asoc->stream_reset_outstanding == 0) { 3830 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3831 } 3832 return (0); 3833 } 3834 3835 static void 3836 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3837 struct sctp_tmit_chunk *chk, 3838 struct sctp_stream_reset_in_request *req, int trunc) 3839 { 3840 uint32_t seq; 3841 int len, i; 3842 int number_entries; 3843 uint16_t temp; 3844 3845 /* 3846 * peer wants me to send a str-reset to him for my outgoing seq's if 3847 * seq_in is right. 3848 */ 3849 struct sctp_association *asoc = &stcb->asoc; 3850 3851 seq = ntohl(req->request_seq); 3852 if (asoc->str_reset_seq_in == seq) { 3853 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3854 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3855 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3856 } else if (trunc) { 3857 /* Can't do it, since they exceeded our buffer size */ 3858 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3859 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3860 len = ntohs(req->ph.param_length); 3861 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3862 if (number_entries) { 3863 for (i = 0; i < number_entries; i++) { 3864 temp = ntohs(req->list_of_streams[i]); 3865 if (temp >= stcb->asoc.streamoutcnt) { 3866 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3867 goto bad_boy; 3868 } 3869 req->list_of_streams[i] = temp; 3870 } 3871 for (i = 0; i < number_entries; i++) { 3872 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3873 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3874 } 3875 } 3876 } else { 3877 /* Its all */ 3878 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3879 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3880 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3881 } 3882 } 3883 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3884 } else { 3885 /* Can't do it, since we have sent one out */ 3886 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3887 } 3888 bad_boy: 3889 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3890 asoc->str_reset_seq_in++; 3891 } else if (asoc->str_reset_seq_in - 1 == seq) { 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3893 } else if (asoc->str_reset_seq_in - 2 == seq) { 3894 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3895 } else { 3896 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3897 } 3898 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3899 } 3900 3901 static int 3902 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3903 struct sctp_tmit_chunk *chk, 3904 struct sctp_stream_reset_tsn_request *req) 3905 { 3906 /* reset all in and out and update the tsn */ 3907 /* 3908 * A) reset my str-seq's on in and out. B) Select a receive next, 3909 * and set cum-ack to it. Also process this selected number as a 3910 * fwd-tsn as well. C) set in the response my next sending seq. 3911 */ 3912 struct sctp_forward_tsn_chunk fwdtsn; 3913 struct sctp_association *asoc = &stcb->asoc; 3914 int abort_flag = 0; 3915 uint32_t seq; 3916 3917 seq = ntohl(req->request_seq); 3918 if (asoc->str_reset_seq_in == seq) { 3919 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3920 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3921 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3922 } else { 3923 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3924 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3925 fwdtsn.ch.chunk_flags = 0; 3926 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3927 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3928 if (abort_flag) { 3929 return (1); 3930 } 3931 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3932 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3933 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3934 } 3935 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3936 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3937 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3938 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3939 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3940 atomic_add_int(&asoc->sending_seq, 1); 3941 /* save off historical data for retrans */ 3942 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3943 asoc->last_sending_seq[0] = asoc->sending_seq; 3944 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3945 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3946 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3947 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3948 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3949 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3950 } 3951 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3952 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3953 asoc->str_reset_seq_in++; 3954 } else if (asoc->str_reset_seq_in - 1 == seq) { 3955 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3956 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3957 } else if (asoc->str_reset_seq_in - 2 == seq) { 3958 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3959 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3960 } else { 3961 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3962 } 3963 return (0); 3964 } 3965 3966 static void 3967 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3968 struct sctp_tmit_chunk *chk, 3969 struct sctp_stream_reset_out_request *req, int trunc) 3970 { 3971 uint32_t seq, tsn; 3972 int number_entries, len; 3973 struct sctp_association *asoc = &stcb->asoc; 3974 3975 seq = ntohl(req->request_seq); 3976 3977 /* now if its not a duplicate we process it */ 3978 if (asoc->str_reset_seq_in == seq) { 3979 len = ntohs(req->ph.param_length); 3980 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3981 /* 3982 * the sender is resetting, handle the list issue.. we must 3983 * a) verify if we can do the reset, if so no problem b) If 3984 * we can't do the reset we must copy the request. c) queue 3985 * it, and setup the data in processor to trigger it off 3986 * when needed and dequeue all the queued data. 3987 */ 3988 tsn = ntohl(req->send_reset_at_tsn); 3989 3990 /* move the reset action back one */ 3991 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3992 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3993 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3994 } else if (trunc) { 3995 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3996 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3997 /* we can do it now */ 3998 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3999 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4000 } else { 4001 /* 4002 * we must queue it up and thus wait for the TSN's 4003 * to arrive that are at or before tsn 4004 */ 4005 struct sctp_stream_reset_list *liste; 4006 int siz; 4007 4008 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4009 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4010 siz, SCTP_M_STRESET); 4011 if (liste == NULL) { 4012 /* gak out of memory */ 4013 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4014 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4015 return; 4016 } 4017 liste->seq = seq; 4018 liste->tsn = tsn; 4019 liste->number_entries = number_entries; 4020 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4021 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4022 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4023 } 4024 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4025 asoc->str_reset_seq_in++; 4026 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4027 /* 4028 * one seq back, just echo back last action since my 4029 * response was lost. 4030 */ 4031 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4032 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4033 /* 4034 * two seq back, just echo back last action since my 4035 * response was lost. 4036 */ 4037 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4038 } else { 4039 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4040 } 4041 } 4042 4043 static void 4044 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4045 struct sctp_stream_reset_add_strm *str_add) 4046 { 4047 /* 4048 * Peer is requesting to add more streams. If its within our 4049 * max-streams we will allow it. 4050 */ 4051 uint32_t num_stream, i; 4052 uint32_t seq; 4053 struct sctp_association *asoc = &stcb->asoc; 4054 struct sctp_queued_to_read *ctl, *nctl; 4055 4056 /* Get the number. */ 4057 seq = ntohl(str_add->request_seq); 4058 num_stream = ntohs(str_add->number_of_streams); 4059 /* Now what would be the new total? */ 4060 if (asoc->str_reset_seq_in == seq) { 4061 num_stream += stcb->asoc.streamincnt; 4062 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4063 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4064 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4065 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4066 (num_stream > 0xffff)) { 4067 /* We must reject it they ask for to many */ 4068 denied: 4069 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4070 } else { 4071 /* Ok, we can do that :-) */ 4072 struct sctp_stream_in *oldstrm; 4073 4074 /* save off the old */ 4075 oldstrm = stcb->asoc.strmin; 4076 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4077 (num_stream * sizeof(struct sctp_stream_in)), 4078 SCTP_M_STRMI); 4079 if (stcb->asoc.strmin == NULL) { 4080 stcb->asoc.strmin = oldstrm; 4081 goto denied; 4082 } 4083 /* copy off the old data */ 4084 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4085 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4086 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4087 stcb->asoc.strmin[i].sid = i; 4088 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4089 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4090 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4091 /* now anything on those queues? */ 4092 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4093 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4094 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4095 } 4096 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4097 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4098 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4099 } 4100 } 4101 /* Init the new streams */ 4102 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4103 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4104 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4105 stcb->asoc.strmin[i].sid = i; 4106 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4107 stcb->asoc.strmin[i].pd_api_started = 0; 4108 stcb->asoc.strmin[i].delivery_started = 0; 4109 } 4110 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4111 /* update the size */ 4112 stcb->asoc.streamincnt = num_stream; 4113 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4114 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4115 } 4116 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4117 asoc->str_reset_seq_in++; 4118 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4119 /* 4120 * one seq back, just echo back last action since my 4121 * response was lost. 4122 */ 4123 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4124 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4125 /* 4126 * two seq back, just echo back last action since my 4127 * response was lost. 4128 */ 4129 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4130 } else { 4131 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4132 4133 } 4134 } 4135 4136 static void 4137 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4138 struct sctp_stream_reset_add_strm *str_add) 4139 { 4140 /* 4141 * Peer is requesting to add more streams. If its within our 4142 * max-streams we will allow it. 4143 */ 4144 uint16_t num_stream; 4145 uint32_t seq; 4146 struct sctp_association *asoc = &stcb->asoc; 4147 4148 /* Get the number. */ 4149 seq = ntohl(str_add->request_seq); 4150 num_stream = ntohs(str_add->number_of_streams); 4151 /* Now what would be the new total? */ 4152 if (asoc->str_reset_seq_in == seq) { 4153 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4154 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4155 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4156 } else if (stcb->asoc.stream_reset_outstanding) { 4157 /* We must reject it we have something pending */ 4158 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4159 } else { 4160 /* Ok, we can do that :-) */ 4161 int mychk; 4162 4163 mychk = stcb->asoc.streamoutcnt; 4164 mychk += num_stream; 4165 if (mychk < 0x10000) { 4166 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4167 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4168 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4169 } 4170 } else { 4171 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4172 } 4173 } 4174 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4175 asoc->str_reset_seq_in++; 4176 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4177 /* 4178 * one seq back, just echo back last action since my 4179 * response was lost. 4180 */ 4181 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4182 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4183 /* 4184 * two seq back, just echo back last action since my 4185 * response was lost. 4186 */ 4187 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4188 } else { 4189 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4190 } 4191 } 4192 4193 #ifdef __GNUC__ 4194 __attribute__((noinline)) 4195 #endif 4196 static int 4197 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4198 struct sctp_chunkhdr *ch_req) 4199 { 4200 uint16_t remaining_length, param_len, ptype; 4201 struct sctp_paramhdr pstore; 4202 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4203 uint32_t seq = 0; 4204 int num_req = 0; 4205 int trunc = 0; 4206 struct sctp_tmit_chunk *chk; 4207 struct sctp_chunkhdr *ch; 4208 struct sctp_paramhdr *ph; 4209 int ret_code = 0; 4210 int num_param = 0; 4211 4212 /* now it may be a reset or a reset-response */ 4213 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4214 4215 /* setup for adding the response */ 4216 sctp_alloc_a_chunk(stcb, chk); 4217 if (chk == NULL) { 4218 return (ret_code); 4219 } 4220 chk->copy_by_ref = 0; 4221 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4222 chk->rec.chunk_id.can_take_data = 0; 4223 chk->flags = 0; 4224 chk->asoc = &stcb->asoc; 4225 chk->no_fr_allowed = 0; 4226 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4227 chk->book_size_scale = 0; 4228 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4229 if (chk->data == NULL) { 4230 strres_nochunk: 4231 if (chk->data) { 4232 sctp_m_freem(chk->data); 4233 chk->data = NULL; 4234 } 4235 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4236 return (ret_code); 4237 } 4238 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4239 4240 /* setup chunk parameters */ 4241 chk->sent = SCTP_DATAGRAM_UNSENT; 4242 chk->snd_count = 0; 4243 chk->whoTo = NULL; 4244 4245 ch = mtod(chk->data, struct sctp_chunkhdr *); 4246 ch->chunk_type = SCTP_STREAM_RESET; 4247 ch->chunk_flags = 0; 4248 ch->chunk_length = htons(chk->send_size); 4249 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4250 offset += sizeof(struct sctp_chunkhdr); 4251 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4252 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4253 if (ph == NULL) { 4254 /* TSNH */ 4255 break; 4256 } 4257 param_len = ntohs(ph->param_length); 4258 if ((param_len > remaining_length) || 4259 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4260 /* bad parameter length */ 4261 break; 4262 } 4263 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4264 (uint8_t *)&cstore); 4265 if (ph == NULL) { 4266 /* TSNH */ 4267 break; 4268 } 4269 ptype = ntohs(ph->param_type); 4270 num_param++; 4271 if (param_len > sizeof(cstore)) { 4272 trunc = 1; 4273 } else { 4274 trunc = 0; 4275 } 4276 if (num_param > SCTP_MAX_RESET_PARAMS) { 4277 /* hit the max of parameters already sorry.. */ 4278 break; 4279 } 4280 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4281 struct sctp_stream_reset_out_request *req_out; 4282 4283 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4284 break; 4285 } 4286 req_out = (struct sctp_stream_reset_out_request *)ph; 4287 num_req++; 4288 if (stcb->asoc.stream_reset_outstanding) { 4289 seq = ntohl(req_out->response_seq); 4290 if (seq == stcb->asoc.str_reset_seq_out) { 4291 /* implicit ack */ 4292 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4293 } 4294 } 4295 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4296 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4297 struct sctp_stream_reset_add_strm *str_add; 4298 4299 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4300 break; 4301 } 4302 str_add = (struct sctp_stream_reset_add_strm *)ph; 4303 num_req++; 4304 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4305 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4306 struct sctp_stream_reset_add_strm *str_add; 4307 4308 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4309 break; 4310 } 4311 str_add = (struct sctp_stream_reset_add_strm *)ph; 4312 num_req++; 4313 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4314 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4315 struct sctp_stream_reset_in_request *req_in; 4316 4317 num_req++; 4318 req_in = (struct sctp_stream_reset_in_request *)ph; 4319 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4320 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4321 struct sctp_stream_reset_tsn_request *req_tsn; 4322 4323 num_req++; 4324 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4325 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4326 ret_code = 1; 4327 goto strres_nochunk; 4328 } 4329 /* no more */ 4330 break; 4331 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4332 struct sctp_stream_reset_response *resp; 4333 uint32_t result; 4334 4335 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4336 break; 4337 } 4338 resp = (struct sctp_stream_reset_response *)ph; 4339 seq = ntohl(resp->response_seq); 4340 result = ntohl(resp->result); 4341 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4342 ret_code = 1; 4343 goto strres_nochunk; 4344 } 4345 } else { 4346 break; 4347 } 4348 offset += SCTP_SIZE32(param_len); 4349 if (remaining_length >= SCTP_SIZE32(param_len)) { 4350 remaining_length -= SCTP_SIZE32(param_len); 4351 } else { 4352 remaining_length = 0; 4353 } 4354 } 4355 if (num_req == 0) { 4356 /* we have no response free the stuff */ 4357 goto strres_nochunk; 4358 } 4359 /* ok we have a chunk to link in */ 4360 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4361 chk, 4362 sctp_next); 4363 stcb->asoc.ctrl_queue_cnt++; 4364 return (ret_code); 4365 } 4366 4367 /* 4368 * Handle a router or endpoints report of a packet loss, there are two ways 4369 * to handle this, either we get the whole packet and must disect it 4370 * ourselves (possibly with truncation and or corruption) or it is a summary 4371 * from a middle box that did the disectting for us. 4372 */ 4373 static void 4374 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4375 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4376 { 4377 uint32_t bottle_bw, on_queue; 4378 uint16_t trunc_len; 4379 unsigned int chlen; 4380 unsigned int at; 4381 struct sctp_chunk_desc desc; 4382 struct sctp_chunkhdr *ch; 4383 4384 chlen = ntohs(cp->ch.chunk_length); 4385 chlen -= sizeof(struct sctp_pktdrop_chunk); 4386 /* XXX possible chlen underflow */ 4387 if (chlen == 0) { 4388 ch = NULL; 4389 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4390 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4391 } else { 4392 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4393 chlen -= sizeof(struct sctphdr); 4394 /* XXX possible chlen underflow */ 4395 memset(&desc, 0, sizeof(desc)); 4396 } 4397 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4398 if (trunc_len > limit) { 4399 trunc_len = limit; 4400 } 4401 4402 /* now the chunks themselves */ 4403 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4404 desc.chunk_type = ch->chunk_type; 4405 /* get amount we need to move */ 4406 at = ntohs(ch->chunk_length); 4407 if (at < sizeof(struct sctp_chunkhdr)) { 4408 /* corrupt chunk, maybe at the end? */ 4409 SCTP_STAT_INCR(sctps_pdrpcrupt); 4410 break; 4411 } 4412 if (trunc_len == 0) { 4413 /* we are supposed to have all of it */ 4414 if (at > chlen) { 4415 /* corrupt skip it */ 4416 SCTP_STAT_INCR(sctps_pdrpcrupt); 4417 break; 4418 } 4419 } else { 4420 /* is there enough of it left ? */ 4421 if (desc.chunk_type == SCTP_DATA) { 4422 if (chlen < (sizeof(struct sctp_data_chunk) + 4423 sizeof(desc.data_bytes))) { 4424 break; 4425 } 4426 } else { 4427 if (chlen < sizeof(struct sctp_chunkhdr)) { 4428 break; 4429 } 4430 } 4431 } 4432 if (desc.chunk_type == SCTP_DATA) { 4433 /* can we get out the tsn? */ 4434 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4435 SCTP_STAT_INCR(sctps_pdrpmbda); 4436 4437 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4438 /* yep */ 4439 struct sctp_data_chunk *dcp; 4440 uint8_t *ddp; 4441 unsigned int iii; 4442 4443 dcp = (struct sctp_data_chunk *)ch; 4444 ddp = (uint8_t *)(dcp + 1); 4445 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4446 desc.data_bytes[iii] = ddp[iii]; 4447 } 4448 desc.tsn_ifany = dcp->dp.tsn; 4449 } else { 4450 /* nope we are done. */ 4451 SCTP_STAT_INCR(sctps_pdrpnedat); 4452 break; 4453 } 4454 } else { 4455 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4456 SCTP_STAT_INCR(sctps_pdrpmbct); 4457 } 4458 4459 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4460 SCTP_STAT_INCR(sctps_pdrppdbrk); 4461 break; 4462 } 4463 if (SCTP_SIZE32(at) > chlen) { 4464 break; 4465 } 4466 chlen -= SCTP_SIZE32(at); 4467 if (chlen < sizeof(struct sctp_chunkhdr)) { 4468 /* done, none left */ 4469 break; 4470 } 4471 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4472 } 4473 /* Now update any rwnd --- possibly */ 4474 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4475 /* From a peer, we get a rwnd report */ 4476 uint32_t a_rwnd; 4477 4478 SCTP_STAT_INCR(sctps_pdrpfehos); 4479 4480 bottle_bw = ntohl(cp->bottle_bw); 4481 on_queue = ntohl(cp->current_onq); 4482 if (bottle_bw && on_queue) { 4483 /* a rwnd report is in here */ 4484 if (bottle_bw > on_queue) 4485 a_rwnd = bottle_bw - on_queue; 4486 else 4487 a_rwnd = 0; 4488 4489 if (a_rwnd == 0) 4490 stcb->asoc.peers_rwnd = 0; 4491 else { 4492 if (a_rwnd > stcb->asoc.total_flight) { 4493 stcb->asoc.peers_rwnd = 4494 a_rwnd - stcb->asoc.total_flight; 4495 } else { 4496 stcb->asoc.peers_rwnd = 0; 4497 } 4498 if (stcb->asoc.peers_rwnd < 4499 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4500 /* SWS sender side engages */ 4501 stcb->asoc.peers_rwnd = 0; 4502 } 4503 } 4504 } 4505 } else { 4506 SCTP_STAT_INCR(sctps_pdrpfmbox); 4507 } 4508 4509 /* now middle boxes in sat networks get a cwnd bump */ 4510 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4511 (stcb->asoc.sat_t3_loss_recovery == 0) && 4512 (stcb->asoc.sat_network)) { 4513 /* 4514 * This is debatable but for sat networks it makes sense 4515 * Note if a T3 timer has went off, we will prohibit any 4516 * changes to cwnd until we exit the t3 loss recovery. 4517 */ 4518 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4519 net, cp, &bottle_bw, &on_queue); 4520 } 4521 } 4522 4523 /* 4524 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4525 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4526 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4527 * length of the complete packet outputs: - length: modified to remaining 4528 * length after control processing - netp: modified to new sctp_nets after 4529 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4530 * bad packet,...) otherwise return the tcb for this packet 4531 */ 4532 #ifdef __GNUC__ 4533 __attribute__((noinline)) 4534 #endif 4535 static struct sctp_tcb * 4536 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4537 struct sockaddr *src, struct sockaddr *dst, 4538 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4539 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4540 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4541 uint32_t vrf_id, uint16_t port) 4542 { 4543 struct sctp_association *asoc; 4544 struct mbuf *op_err; 4545 char msg[SCTP_DIAG_INFO_LEN]; 4546 uint32_t vtag_in; 4547 int num_chunks = 0; /* number of control chunks processed */ 4548 uint32_t chk_length, contiguous; 4549 int ret; 4550 int abort_no_unlock = 0; 4551 int ecne_seen = 0; 4552 4553 /* 4554 * How big should this be, and should it be alloc'd? Lets try the 4555 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4556 * until we get into jumbo grams and such.. 4557 */ 4558 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4559 int got_auth = 0; 4560 uint32_t auth_offset = 0, auth_len = 0; 4561 int auth_skipped = 0; 4562 int asconf_cnt = 0; 4563 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4564 struct socket *so; 4565 #endif 4566 4567 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4568 iphlen, *offset, length, (void *)stcb); 4569 4570 if (stcb) { 4571 SCTP_TCB_LOCK_ASSERT(stcb); 4572 } 4573 /* validate chunk header length... */ 4574 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4575 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4576 ntohs(ch->chunk_length)); 4577 *offset = length; 4578 return (stcb); 4579 } 4580 /* 4581 * validate the verification tag 4582 */ 4583 vtag_in = ntohl(sh->v_tag); 4584 4585 if (ch->chunk_type == SCTP_INITIATION) { 4586 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4587 ntohs(ch->chunk_length), vtag_in); 4588 if (vtag_in != 0) { 4589 /* protocol error- silently discard... */ 4590 SCTP_STAT_INCR(sctps_badvtag); 4591 if (stcb != NULL) { 4592 SCTP_TCB_UNLOCK(stcb); 4593 } 4594 return (NULL); 4595 } 4596 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4597 /* 4598 * If there is no stcb, skip the AUTH chunk and process 4599 * later after a stcb is found (to validate the lookup was 4600 * valid. 4601 */ 4602 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4603 (stcb == NULL) && 4604 (inp->auth_supported == 1)) { 4605 /* save this chunk for later processing */ 4606 auth_skipped = 1; 4607 auth_offset = *offset; 4608 auth_len = ntohs(ch->chunk_length); 4609 4610 /* (temporarily) move past this chunk */ 4611 *offset += SCTP_SIZE32(auth_len); 4612 if (*offset >= length) { 4613 /* no more data left in the mbuf chain */ 4614 *offset = length; 4615 return (NULL); 4616 } 4617 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4618 sizeof(struct sctp_chunkhdr), chunk_buf); 4619 } 4620 if (ch == NULL) { 4621 /* Help */ 4622 *offset = length; 4623 return (stcb); 4624 } 4625 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4626 goto process_control_chunks; 4627 } 4628 /* 4629 * first check if it's an ASCONF with an unknown src addr we 4630 * need to look inside to find the association 4631 */ 4632 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4633 struct sctp_chunkhdr *asconf_ch = ch; 4634 uint32_t asconf_offset = 0, asconf_len = 0; 4635 4636 /* inp's refcount may be reduced */ 4637 SCTP_INP_INCR_REF(inp); 4638 4639 asconf_offset = *offset; 4640 do { 4641 asconf_len = ntohs(asconf_ch->chunk_length); 4642 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4643 break; 4644 stcb = sctp_findassociation_ep_asconf(m, 4645 *offset, 4646 dst, 4647 sh, &inp, netp, vrf_id); 4648 if (stcb != NULL) 4649 break; 4650 asconf_offset += SCTP_SIZE32(asconf_len); 4651 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4652 sizeof(struct sctp_chunkhdr), chunk_buf); 4653 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4654 if (stcb == NULL) { 4655 /* 4656 * reduce inp's refcount if not reduced in 4657 * sctp_findassociation_ep_asconf(). 4658 */ 4659 SCTP_INP_DECR_REF(inp); 4660 } 4661 4662 /* now go back and verify any auth chunk to be sure */ 4663 if (auth_skipped && (stcb != NULL)) { 4664 struct sctp_auth_chunk *auth; 4665 4666 auth = (struct sctp_auth_chunk *) 4667 sctp_m_getptr(m, auth_offset, 4668 auth_len, chunk_buf); 4669 got_auth = 1; 4670 auth_skipped = 0; 4671 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4672 auth_offset)) { 4673 /* auth HMAC failed so dump it */ 4674 *offset = length; 4675 return (stcb); 4676 } else { 4677 /* remaining chunks are HMAC checked */ 4678 stcb->asoc.authenticated = 1; 4679 } 4680 } 4681 } 4682 if (stcb == NULL) { 4683 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4684 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4685 msg); 4686 /* no association, so it's out of the blue... */ 4687 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4688 mflowtype, mflowid, inp->fibnum, 4689 vrf_id, port); 4690 *offset = length; 4691 return (NULL); 4692 } 4693 asoc = &stcb->asoc; 4694 /* ABORT and SHUTDOWN can use either v_tag... */ 4695 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4696 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4697 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4698 /* Take the T-bit always into account. */ 4699 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4700 (vtag_in == asoc->my_vtag)) || 4701 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4702 (asoc->peer_vtag != htonl(0)) && 4703 (vtag_in == asoc->peer_vtag))) { 4704 /* this is valid */ 4705 } else { 4706 /* drop this packet... */ 4707 SCTP_STAT_INCR(sctps_badvtag); 4708 if (stcb != NULL) { 4709 SCTP_TCB_UNLOCK(stcb); 4710 } 4711 return (NULL); 4712 } 4713 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4714 if (vtag_in != asoc->my_vtag) { 4715 /* 4716 * this could be a stale SHUTDOWN-ACK or the 4717 * peer never got the SHUTDOWN-COMPLETE and 4718 * is still hung; we have started a new asoc 4719 * but it won't complete until the shutdown 4720 * is completed 4721 */ 4722 if (stcb != NULL) { 4723 SCTP_TCB_UNLOCK(stcb); 4724 } 4725 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4726 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4727 msg); 4728 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4729 sh, inp, op_err, 4730 mflowtype, mflowid, fibnum, 4731 vrf_id, port); 4732 return (NULL); 4733 } 4734 } else { 4735 /* for all other chunks, vtag must match */ 4736 if (vtag_in != asoc->my_vtag) { 4737 /* invalid vtag... */ 4738 SCTPDBG(SCTP_DEBUG_INPUT3, 4739 "invalid vtag: %xh, expect %xh\n", 4740 vtag_in, asoc->my_vtag); 4741 SCTP_STAT_INCR(sctps_badvtag); 4742 if (stcb != NULL) { 4743 SCTP_TCB_UNLOCK(stcb); 4744 } 4745 *offset = length; 4746 return (NULL); 4747 } 4748 } 4749 } /* end if !SCTP_COOKIE_ECHO */ 4750 /* 4751 * process all control chunks... 4752 */ 4753 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4754 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4755 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4756 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4757 /* implied cookie-ack.. we must have lost the ack */ 4758 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4759 *netp); 4760 } 4761 4762 process_control_chunks: 4763 while (IS_SCTP_CONTROL(ch)) { 4764 /* validate chunk length */ 4765 chk_length = ntohs(ch->chunk_length); 4766 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4767 ch->chunk_type, chk_length); 4768 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4769 if (chk_length < sizeof(*ch) || 4770 (*offset + (int)chk_length) > length) { 4771 *offset = length; 4772 return (stcb); 4773 } 4774 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4775 /* 4776 * INIT and INIT-ACK only gets the init ack "header" portion 4777 * only because we don't have to process the peer's COOKIE. 4778 * All others get a complete chunk. 4779 */ 4780 switch (ch->chunk_type) { 4781 case SCTP_INITIATION: 4782 contiguous = sizeof(struct sctp_init_chunk); 4783 break; 4784 case SCTP_INITIATION_ACK: 4785 contiguous = sizeof(struct sctp_init_ack_chunk); 4786 break; 4787 default: 4788 contiguous = min(chk_length, sizeof(chunk_buf)); 4789 break; 4790 } 4791 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4792 contiguous, 4793 chunk_buf); 4794 if (ch == NULL) { 4795 *offset = length; 4796 if (stcb != NULL) { 4797 SCTP_TCB_UNLOCK(stcb); 4798 } 4799 return (NULL); 4800 } 4801 4802 num_chunks++; 4803 /* Save off the last place we got a control from */ 4804 if (stcb != NULL) { 4805 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4806 /* 4807 * allow last_control to be NULL if 4808 * ASCONF... ASCONF processing will find the 4809 * right net later 4810 */ 4811 if ((netp != NULL) && (*netp != NULL)) 4812 stcb->asoc.last_control_chunk_from = *netp; 4813 } 4814 } 4815 #ifdef SCTP_AUDITING_ENABLED 4816 sctp_audit_log(0xB0, ch->chunk_type); 4817 #endif 4818 4819 /* check to see if this chunk required auth, but isn't */ 4820 if ((stcb != NULL) && 4821 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4822 !stcb->asoc.authenticated) { 4823 /* "silently" ignore */ 4824 SCTP_STAT_INCR(sctps_recvauthmissing); 4825 goto next_chunk; 4826 } 4827 switch (ch->chunk_type) { 4828 case SCTP_INITIATION: 4829 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4830 /* The INIT chunk must be the only chunk. */ 4831 if ((num_chunks > 1) || 4832 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4833 /* RFC 4960 requires that no ABORT is sent */ 4834 *offset = length; 4835 if (stcb != NULL) { 4836 SCTP_TCB_UNLOCK(stcb); 4837 } 4838 return (NULL); 4839 } 4840 /* Honor our resource limit. */ 4841 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4842 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4843 sctp_abort_association(inp, stcb, m, iphlen, 4844 src, dst, sh, op_err, 4845 mflowtype, mflowid, 4846 vrf_id, port); 4847 *offset = length; 4848 return (NULL); 4849 } 4850 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4851 (struct sctp_init_chunk *)ch, inp, 4852 stcb, *netp, &abort_no_unlock, 4853 mflowtype, mflowid, 4854 vrf_id, port); 4855 *offset = length; 4856 if ((!abort_no_unlock) && (stcb != NULL)) { 4857 SCTP_TCB_UNLOCK(stcb); 4858 } 4859 return (NULL); 4860 break; 4861 case SCTP_PAD_CHUNK: 4862 break; 4863 case SCTP_INITIATION_ACK: 4864 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4865 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4866 /* We are not interested anymore */ 4867 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4868 ; 4869 } else { 4870 *offset = length; 4871 if (stcb != NULL) { 4872 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4873 so = SCTP_INP_SO(inp); 4874 atomic_add_int(&stcb->asoc.refcnt, 1); 4875 SCTP_TCB_UNLOCK(stcb); 4876 SCTP_SOCKET_LOCK(so, 1); 4877 SCTP_TCB_LOCK(stcb); 4878 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4879 #endif 4880 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4881 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4882 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4883 SCTP_SOCKET_UNLOCK(so, 1); 4884 #endif 4885 } 4886 return (NULL); 4887 } 4888 } 4889 /* The INIT-ACK chunk must be the only chunk. */ 4890 if ((num_chunks > 1) || 4891 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4892 *offset = length; 4893 return (stcb); 4894 } 4895 if ((netp != NULL) && (*netp != NULL)) { 4896 ret = sctp_handle_init_ack(m, iphlen, *offset, 4897 src, dst, sh, 4898 (struct sctp_init_ack_chunk *)ch, 4899 stcb, *netp, 4900 &abort_no_unlock, 4901 mflowtype, mflowid, 4902 vrf_id); 4903 } else { 4904 ret = -1; 4905 } 4906 *offset = length; 4907 if (abort_no_unlock) { 4908 return (NULL); 4909 } 4910 /* 4911 * Special case, I must call the output routine to 4912 * get the cookie echoed 4913 */ 4914 if ((stcb != NULL) && (ret == 0)) { 4915 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4916 } 4917 return (stcb); 4918 break; 4919 case SCTP_SELECTIVE_ACK: 4920 case SCTP_NR_SELECTIVE_ACK: 4921 { 4922 int abort_now = 0; 4923 uint32_t a_rwnd, cum_ack; 4924 uint16_t num_seg, num_nr_seg, num_dup; 4925 uint8_t flags; 4926 int offset_seg, offset_dup; 4927 4928 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4929 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4930 SCTP_STAT_INCR(sctps_recvsacks); 4931 if (stcb == NULL) { 4932 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4933 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4934 break; 4935 } 4936 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4937 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4938 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4939 break; 4940 } 4941 } else { 4942 if (stcb->asoc.nrsack_supported == 0) { 4943 goto unknown_chunk; 4944 } 4945 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4946 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4947 break; 4948 } 4949 } 4950 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4951 /*- 4952 * If we have sent a shutdown-ack, we will pay no 4953 * attention to a sack sent in to us since 4954 * we don't care anymore. 4955 */ 4956 break; 4957 } 4958 flags = ch->chunk_flags; 4959 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4960 struct sctp_sack_chunk *sack; 4961 4962 sack = (struct sctp_sack_chunk *)ch; 4963 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4964 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4965 num_nr_seg = 0; 4966 num_dup = ntohs(sack->sack.num_dup_tsns); 4967 a_rwnd = ntohl(sack->sack.a_rwnd); 4968 if (sizeof(struct sctp_sack_chunk) + 4969 num_seg * sizeof(struct sctp_gap_ack_block) + 4970 num_dup * sizeof(uint32_t) != chk_length) { 4971 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4972 break; 4973 } 4974 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4975 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4976 } else { 4977 struct sctp_nr_sack_chunk *nr_sack; 4978 4979 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4980 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4981 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4982 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4983 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4984 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4985 if (sizeof(struct sctp_nr_sack_chunk) + 4986 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4987 num_dup * sizeof(uint32_t) != chk_length) { 4988 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4989 break; 4990 } 4991 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4992 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4993 } 4994 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4995 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4996 cum_ack, num_seg, a_rwnd); 4997 stcb->asoc.seen_a_sack_this_pkt = 1; 4998 if ((stcb->asoc.pr_sctp_cnt == 0) && 4999 (num_seg == 0) && (num_nr_seg == 0) && 5000 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5001 (stcb->asoc.saw_sack_with_frags == 0) && 5002 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5003 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5004 /* 5005 * We have a SIMPLE sack having no 5006 * prior segments and data on sent 5007 * queue to be acked. Use the faster 5008 * path sack processing. We also 5009 * allow window update sacks with no 5010 * missing segments to go this way 5011 * too. 5012 */ 5013 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5014 &abort_now, ecne_seen); 5015 } else { 5016 if ((netp != NULL) && (*netp != NULL)) { 5017 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5018 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5019 cum_ack, a_rwnd, ecne_seen); 5020 } 5021 } 5022 if (abort_now) { 5023 /* ABORT signal from sack processing */ 5024 *offset = length; 5025 return (NULL); 5026 } 5027 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5028 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5029 (stcb->asoc.stream_queue_cnt == 0)) { 5030 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5031 } 5032 break; 5033 } 5034 case SCTP_HEARTBEAT_REQUEST: 5035 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5036 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5037 SCTP_STAT_INCR(sctps_recvheartbeat); 5038 sctp_send_heartbeat_ack(stcb, m, *offset, 5039 chk_length, *netp); 5040 } 5041 break; 5042 case SCTP_HEARTBEAT_ACK: 5043 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5044 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5045 /* Its not ours */ 5046 *offset = length; 5047 return (stcb); 5048 } 5049 SCTP_STAT_INCR(sctps_recvheartbeatack); 5050 if ((netp != NULL) && (*netp != NULL)) { 5051 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5052 stcb, *netp); 5053 } 5054 break; 5055 case SCTP_ABORT_ASSOCIATION: 5056 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5057 (void *)stcb); 5058 *offset = length; 5059 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5060 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5061 return (NULL); 5062 } else { 5063 return (stcb); 5064 } 5065 } else { 5066 return (NULL); 5067 } 5068 break; 5069 case SCTP_SHUTDOWN: 5070 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5071 (void *)stcb); 5072 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5073 *offset = length; 5074 return (stcb); 5075 } 5076 if ((netp != NULL) && (*netp != NULL)) { 5077 int abort_flag = 0; 5078 5079 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5080 stcb, *netp, &abort_flag); 5081 if (abort_flag) { 5082 *offset = length; 5083 return (NULL); 5084 } 5085 } 5086 break; 5087 case SCTP_SHUTDOWN_ACK: 5088 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5089 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5090 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5091 } 5092 *offset = length; 5093 return (NULL); 5094 break; 5095 case SCTP_OPERATION_ERROR: 5096 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5097 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5098 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5099 *offset = length; 5100 return (NULL); 5101 } 5102 break; 5103 case SCTP_COOKIE_ECHO: 5104 SCTPDBG(SCTP_DEBUG_INPUT3, 5105 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5106 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5107 ; 5108 } else { 5109 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5110 /* We are not interested anymore */ 5111 abend: 5112 if (stcb != NULL) { 5113 SCTP_TCB_UNLOCK(stcb); 5114 } 5115 *offset = length; 5116 return (NULL); 5117 } 5118 } 5119 /*- 5120 * First are we accepting? We do this again here 5121 * since it is possible that a previous endpoint WAS 5122 * listening responded to a INIT-ACK and then 5123 * closed. We opened and bound.. and are now no 5124 * longer listening. 5125 * 5126 * XXXGL: notes on checking listen queue length. 5127 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5128 * SOLISTENING(), because a listening "UDP type" 5129 * socket isn't listening in terms of the socket 5130 * layer. It is a normal data flow socket, that 5131 * can fork off new connections. Thus, we should 5132 * look into sol_qlen only in case we are !UDP. 5133 * 2) Checking sol_qlen in general requires locking 5134 * the socket, and this code lacks that. 5135 */ 5136 if ((stcb == NULL) && 5137 (!SCTP_IS_LISTENING(inp) || 5138 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5139 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5140 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5141 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5142 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5143 sctp_abort_association(inp, stcb, m, iphlen, 5144 src, dst, sh, op_err, 5145 mflowtype, mflowid, 5146 vrf_id, port); 5147 } 5148 *offset = length; 5149 return (NULL); 5150 } else { 5151 struct mbuf *ret_buf; 5152 struct sctp_inpcb *linp; 5153 5154 if (stcb) { 5155 linp = NULL; 5156 } else { 5157 linp = inp; 5158 } 5159 5160 if (linp != NULL) { 5161 SCTP_ASOC_CREATE_LOCK(linp); 5162 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5163 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5164 SCTP_ASOC_CREATE_UNLOCK(linp); 5165 goto abend; 5166 } 5167 } 5168 5169 if (netp != NULL) { 5170 struct sctp_tcb *locked_stcb; 5171 5172 locked_stcb = stcb; 5173 ret_buf = 5174 sctp_handle_cookie_echo(m, iphlen, 5175 *offset, 5176 src, dst, 5177 sh, 5178 (struct sctp_cookie_echo_chunk *)ch, 5179 &inp, &stcb, netp, 5180 auth_skipped, 5181 auth_offset, 5182 auth_len, 5183 &locked_stcb, 5184 mflowtype, 5185 mflowid, 5186 vrf_id, 5187 port); 5188 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5189 SCTP_TCB_UNLOCK(locked_stcb); 5190 } 5191 if (stcb != NULL) { 5192 SCTP_TCB_LOCK_ASSERT(stcb); 5193 } 5194 } else { 5195 ret_buf = NULL; 5196 } 5197 if (linp != NULL) { 5198 SCTP_ASOC_CREATE_UNLOCK(linp); 5199 } 5200 if (ret_buf == NULL) { 5201 if (stcb != NULL) { 5202 SCTP_TCB_UNLOCK(stcb); 5203 } 5204 SCTPDBG(SCTP_DEBUG_INPUT3, 5205 "GAK, null buffer\n"); 5206 *offset = length; 5207 return (NULL); 5208 } 5209 /* if AUTH skipped, see if it verified... */ 5210 if (auth_skipped) { 5211 got_auth = 1; 5212 auth_skipped = 0; 5213 } 5214 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5215 /* 5216 * Restart the timer if we have 5217 * pending data 5218 */ 5219 struct sctp_tmit_chunk *chk; 5220 5221 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5222 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5223 } 5224 } 5225 break; 5226 case SCTP_COOKIE_ACK: 5227 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5228 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5229 return (stcb); 5230 } 5231 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5232 /* We are not interested anymore */ 5233 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5234 ; 5235 } else if (stcb) { 5236 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5237 so = SCTP_INP_SO(inp); 5238 atomic_add_int(&stcb->asoc.refcnt, 1); 5239 SCTP_TCB_UNLOCK(stcb); 5240 SCTP_SOCKET_LOCK(so, 1); 5241 SCTP_TCB_LOCK(stcb); 5242 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5243 #endif 5244 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5245 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5246 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5247 SCTP_SOCKET_UNLOCK(so, 1); 5248 #endif 5249 *offset = length; 5250 return (NULL); 5251 } 5252 } 5253 if ((netp != NULL) && (*netp != NULL)) { 5254 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5255 } 5256 break; 5257 case SCTP_ECN_ECHO: 5258 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5259 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5260 /* Its not ours */ 5261 *offset = length; 5262 return (stcb); 5263 } 5264 if (stcb->asoc.ecn_supported == 0) { 5265 goto unknown_chunk; 5266 } 5267 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5268 ecne_seen = 1; 5269 break; 5270 case SCTP_ECN_CWR: 5271 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5272 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5273 *offset = length; 5274 return (stcb); 5275 } 5276 if (stcb->asoc.ecn_supported == 0) { 5277 goto unknown_chunk; 5278 } 5279 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5280 break; 5281 case SCTP_SHUTDOWN_COMPLETE: 5282 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5283 /* must be first and only chunk */ 5284 if ((num_chunks > 1) || 5285 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5286 *offset = length; 5287 return (stcb); 5288 } 5289 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5290 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5291 stcb, *netp); 5292 } 5293 *offset = length; 5294 return (NULL); 5295 break; 5296 case SCTP_ASCONF: 5297 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5298 if (stcb != NULL) { 5299 if (stcb->asoc.asconf_supported == 0) { 5300 goto unknown_chunk; 5301 } 5302 sctp_handle_asconf(m, *offset, src, 5303 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5304 asconf_cnt++; 5305 } 5306 break; 5307 case SCTP_ASCONF_ACK: 5308 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5309 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5310 /* Its not ours */ 5311 *offset = length; 5312 return (stcb); 5313 } 5314 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5315 if (stcb->asoc.asconf_supported == 0) { 5316 goto unknown_chunk; 5317 } 5318 /* He's alive so give him credit */ 5319 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5320 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5321 stcb->asoc.overall_error_count, 5322 0, 5323 SCTP_FROM_SCTP_INPUT, 5324 __LINE__); 5325 } 5326 stcb->asoc.overall_error_count = 0; 5327 sctp_handle_asconf_ack(m, *offset, 5328 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5329 if (abort_no_unlock) 5330 return (NULL); 5331 } 5332 break; 5333 case SCTP_FORWARD_CUM_TSN: 5334 case SCTP_IFORWARD_CUM_TSN: 5335 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5336 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5337 /* Its not ours */ 5338 *offset = length; 5339 return (stcb); 5340 } 5341 5342 if (stcb != NULL) { 5343 int abort_flag = 0; 5344 5345 if (stcb->asoc.prsctp_supported == 0) { 5346 goto unknown_chunk; 5347 } 5348 *fwd_tsn_seen = 1; 5349 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5350 /* We are not interested anymore */ 5351 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5352 so = SCTP_INP_SO(inp); 5353 atomic_add_int(&stcb->asoc.refcnt, 1); 5354 SCTP_TCB_UNLOCK(stcb); 5355 SCTP_SOCKET_LOCK(so, 1); 5356 SCTP_TCB_LOCK(stcb); 5357 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5358 #endif 5359 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5360 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5361 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5362 SCTP_SOCKET_UNLOCK(so, 1); 5363 #endif 5364 *offset = length; 5365 return (NULL); 5366 } 5367 /* 5368 * For sending a SACK this looks like DATA 5369 * chunks. 5370 */ 5371 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5372 sctp_handle_forward_tsn(stcb, 5373 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5374 if (abort_flag) { 5375 *offset = length; 5376 return (NULL); 5377 } 5378 } 5379 break; 5380 case SCTP_STREAM_RESET: 5381 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5382 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5383 /* Its not ours */ 5384 *offset = length; 5385 return (stcb); 5386 } 5387 if (stcb->asoc.reconfig_supported == 0) { 5388 goto unknown_chunk; 5389 } 5390 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5391 /* stop processing */ 5392 *offset = length; 5393 return (NULL); 5394 } 5395 break; 5396 case SCTP_PACKET_DROPPED: 5397 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5398 /* re-get it all please */ 5399 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5400 /* Its not ours */ 5401 *offset = length; 5402 return (stcb); 5403 } 5404 5405 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5406 if (stcb->asoc.pktdrop_supported == 0) { 5407 goto unknown_chunk; 5408 } 5409 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5410 stcb, *netp, 5411 min(chk_length, contiguous)); 5412 } 5413 break; 5414 case SCTP_AUTHENTICATION: 5415 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5416 if (stcb == NULL) { 5417 /* save the first AUTH for later processing */ 5418 if (auth_skipped == 0) { 5419 auth_offset = *offset; 5420 auth_len = chk_length; 5421 auth_skipped = 1; 5422 } 5423 /* skip this chunk (temporarily) */ 5424 goto next_chunk; 5425 } 5426 if (stcb->asoc.auth_supported == 0) { 5427 goto unknown_chunk; 5428 } 5429 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5430 (chk_length > (sizeof(struct sctp_auth_chunk) + 5431 SCTP_AUTH_DIGEST_LEN_MAX))) { 5432 /* Its not ours */ 5433 *offset = length; 5434 return (stcb); 5435 } 5436 if (got_auth == 1) { 5437 /* skip this chunk... it's already auth'd */ 5438 goto next_chunk; 5439 } 5440 got_auth = 1; 5441 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5442 m, *offset)) { 5443 /* auth HMAC failed so dump the packet */ 5444 *offset = length; 5445 return (stcb); 5446 } else { 5447 /* remaining chunks are HMAC checked */ 5448 stcb->asoc.authenticated = 1; 5449 } 5450 break; 5451 5452 default: 5453 unknown_chunk: 5454 /* it's an unknown chunk! */ 5455 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5456 struct sctp_gen_error_cause *cause; 5457 int len; 5458 5459 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5460 0, M_NOWAIT, 1, MT_DATA); 5461 if (op_err != NULL) { 5462 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5463 cause = mtod(op_err, struct sctp_gen_error_cause *); 5464 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5465 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5466 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5467 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5468 if (SCTP_BUF_NEXT(op_err) != NULL) { 5469 #ifdef SCTP_MBUF_LOGGING 5470 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5471 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5472 } 5473 #endif 5474 sctp_queue_op_err(stcb, op_err); 5475 } else { 5476 sctp_m_freem(op_err); 5477 } 5478 } 5479 } 5480 if ((ch->chunk_type & 0x80) == 0) { 5481 /* discard this packet */ 5482 *offset = length; 5483 return (stcb); 5484 } /* else skip this bad chunk and continue... */ 5485 break; 5486 } /* switch (ch->chunk_type) */ 5487 5488 5489 next_chunk: 5490 /* get the next chunk */ 5491 *offset += SCTP_SIZE32(chk_length); 5492 if (*offset >= length) { 5493 /* no more data left in the mbuf chain */ 5494 break; 5495 } 5496 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5497 sizeof(struct sctp_chunkhdr), chunk_buf); 5498 if (ch == NULL) { 5499 *offset = length; 5500 return (stcb); 5501 } 5502 } /* while */ 5503 5504 if ((asconf_cnt > 0) && (stcb != NULL)) { 5505 sctp_send_asconf_ack(stcb); 5506 } 5507 return (stcb); 5508 } 5509 5510 5511 /* 5512 * common input chunk processing (v4 and v6) 5513 */ 5514 void 5515 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5516 struct sockaddr *src, struct sockaddr *dst, 5517 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5518 uint8_t compute_crc, 5519 uint8_t ecn_bits, 5520 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5521 uint32_t vrf_id, uint16_t port) 5522 { 5523 uint32_t high_tsn; 5524 int fwd_tsn_seen = 0, data_processed = 0; 5525 struct mbuf *m = *mm, *op_err; 5526 char msg[SCTP_DIAG_INFO_LEN]; 5527 int un_sent; 5528 int cnt_ctrl_ready = 0; 5529 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5530 struct sctp_tcb *stcb = NULL; 5531 struct sctp_nets *net = NULL; 5532 5533 SCTP_STAT_INCR(sctps_recvdatagrams); 5534 #ifdef SCTP_AUDITING_ENABLED 5535 sctp_audit_log(0xE0, 1); 5536 sctp_auditing(0, inp, stcb, net); 5537 #endif 5538 if (compute_crc != 0) { 5539 uint32_t check, calc_check; 5540 5541 check = sh->checksum; 5542 sh->checksum = 0; 5543 calc_check = sctp_calculate_cksum(m, iphlen); 5544 sh->checksum = check; 5545 if (calc_check != check) { 5546 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5547 calc_check, check, (void *)m, length, iphlen); 5548 stcb = sctp_findassociation_addr(m, offset, src, dst, 5549 sh, ch, &inp, &net, vrf_id); 5550 #if defined(INET) || defined(INET6) 5551 if ((ch->chunk_type != SCTP_INITIATION) && 5552 (net != NULL) && (net->port != port)) { 5553 if (net->port == 0) { 5554 /* UDP encapsulation turned on. */ 5555 net->mtu -= sizeof(struct udphdr); 5556 if (stcb->asoc.smallest_mtu > net->mtu) { 5557 sctp_pathmtu_adjustment(stcb, net->mtu); 5558 } 5559 } else if (port == 0) { 5560 /* UDP encapsulation turned off. */ 5561 net->mtu += sizeof(struct udphdr); 5562 /* XXX Update smallest_mtu */ 5563 } 5564 net->port = port; 5565 } 5566 #endif 5567 if (net != NULL) { 5568 net->flowtype = mflowtype; 5569 net->flowid = mflowid; 5570 } 5571 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5572 if ((inp != NULL) && (stcb != NULL)) { 5573 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5574 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5575 } else if ((inp != NULL) && (stcb == NULL)) { 5576 inp_decr = inp; 5577 } 5578 SCTP_STAT_INCR(sctps_badsum); 5579 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5580 goto out; 5581 } 5582 } 5583 /* Destination port of 0 is illegal, based on RFC4960. */ 5584 if (sh->dest_port == 0) { 5585 SCTP_STAT_INCR(sctps_hdrops); 5586 goto out; 5587 } 5588 stcb = sctp_findassociation_addr(m, offset, src, dst, 5589 sh, ch, &inp, &net, vrf_id); 5590 #if defined(INET) || defined(INET6) 5591 if ((ch->chunk_type != SCTP_INITIATION) && 5592 (net != NULL) && (net->port != port)) { 5593 if (net->port == 0) { 5594 /* UDP encapsulation turned on. */ 5595 net->mtu -= sizeof(struct udphdr); 5596 if (stcb->asoc.smallest_mtu > net->mtu) { 5597 sctp_pathmtu_adjustment(stcb, net->mtu); 5598 } 5599 } else if (port == 0) { 5600 /* UDP encapsulation turned off. */ 5601 net->mtu += sizeof(struct udphdr); 5602 /* XXX Update smallest_mtu */ 5603 } 5604 net->port = port; 5605 } 5606 #endif 5607 if (net != NULL) { 5608 net->flowtype = mflowtype; 5609 net->flowid = mflowid; 5610 } 5611 if (inp == NULL) { 5612 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5613 SCTP_STAT_INCR(sctps_noport); 5614 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5615 goto out; 5616 } 5617 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5618 sctp_send_shutdown_complete2(src, dst, sh, 5619 mflowtype, mflowid, fibnum, 5620 vrf_id, port); 5621 goto out; 5622 } 5623 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5624 goto out; 5625 } 5626 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5627 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5628 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5629 (ch->chunk_type != SCTP_INIT))) { 5630 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5631 "Out of the blue"); 5632 sctp_send_abort(m, iphlen, src, dst, 5633 sh, 0, op_err, 5634 mflowtype, mflowid, fibnum, 5635 vrf_id, port); 5636 } 5637 } 5638 goto out; 5639 } else if (stcb == NULL) { 5640 inp_decr = inp; 5641 } 5642 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5643 (void *)m, iphlen, offset, length, (void *)stcb); 5644 if (stcb) { 5645 /* always clear this before beginning a packet */ 5646 stcb->asoc.authenticated = 0; 5647 stcb->asoc.seen_a_sack_this_pkt = 0; 5648 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5649 (void *)stcb, stcb->asoc.state); 5650 5651 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5652 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5653 /*- 5654 * If we hit here, we had a ref count 5655 * up when the assoc was aborted and the 5656 * timer is clearing out the assoc, we should 5657 * NOT respond to any packet.. its OOTB. 5658 */ 5659 SCTP_TCB_UNLOCK(stcb); 5660 stcb = NULL; 5661 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5662 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5663 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5664 msg); 5665 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5666 mflowtype, mflowid, inp->fibnum, 5667 vrf_id, port); 5668 goto out; 5669 } 5670 } 5671 if (IS_SCTP_CONTROL(ch)) { 5672 /* process the control portion of the SCTP packet */ 5673 /* sa_ignore NO_NULL_CHK */ 5674 stcb = sctp_process_control(m, iphlen, &offset, length, 5675 src, dst, sh, ch, 5676 inp, stcb, &net, &fwd_tsn_seen, 5677 mflowtype, mflowid, fibnum, 5678 vrf_id, port); 5679 if (stcb) { 5680 /* 5681 * This covers us if the cookie-echo was there and 5682 * it changes our INP. 5683 */ 5684 inp = stcb->sctp_ep; 5685 #if defined(INET) || defined(INET6) 5686 if ((ch->chunk_type != SCTP_INITIATION) && 5687 (net != NULL) && (net->port != port)) { 5688 if (net->port == 0) { 5689 /* UDP encapsulation turned on. */ 5690 net->mtu -= sizeof(struct udphdr); 5691 if (stcb->asoc.smallest_mtu > net->mtu) { 5692 sctp_pathmtu_adjustment(stcb, net->mtu); 5693 } 5694 } else if (port == 0) { 5695 /* UDP encapsulation turned off. */ 5696 net->mtu += sizeof(struct udphdr); 5697 /* XXX Update smallest_mtu */ 5698 } 5699 net->port = port; 5700 } 5701 #endif 5702 } 5703 } else { 5704 /* 5705 * no control chunks, so pre-process DATA chunks (these 5706 * checks are taken care of by control processing) 5707 */ 5708 5709 /* 5710 * if DATA only packet, and auth is required, then punt... 5711 * can't have authenticated without any AUTH (control) 5712 * chunks 5713 */ 5714 if ((stcb != NULL) && 5715 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5716 /* "silently" ignore */ 5717 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5718 SCTP_STAT_INCR(sctps_recvauthmissing); 5719 goto out; 5720 } 5721 if (stcb == NULL) { 5722 /* out of the blue DATA chunk */ 5723 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5724 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5725 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5726 msg); 5727 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5728 mflowtype, mflowid, fibnum, 5729 vrf_id, port); 5730 goto out; 5731 } 5732 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5733 /* v_tag mismatch! */ 5734 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5735 SCTP_STAT_INCR(sctps_badvtag); 5736 goto out; 5737 } 5738 } 5739 5740 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5741 if (stcb == NULL) { 5742 /* 5743 * no valid TCB for this packet, or we found it's a bad 5744 * packet while processing control, or we're done with this 5745 * packet (done or skip rest of data), so we drop it... 5746 */ 5747 goto out; 5748 } 5749 5750 /* 5751 * DATA chunk processing 5752 */ 5753 /* plow through the data chunks while length > offset */ 5754 5755 /* 5756 * Rest should be DATA only. Check authentication state if AUTH for 5757 * DATA is required. 5758 */ 5759 if ((length > offset) && 5760 (stcb != NULL) && 5761 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5762 !stcb->asoc.authenticated) { 5763 /* "silently" ignore */ 5764 SCTP_STAT_INCR(sctps_recvauthmissing); 5765 SCTPDBG(SCTP_DEBUG_AUTH1, 5766 "Data chunk requires AUTH, skipped\n"); 5767 goto trigger_send; 5768 } 5769 if (length > offset) { 5770 int retval; 5771 5772 /* 5773 * First check to make sure our state is correct. We would 5774 * not get here unless we really did have a tag, so we don't 5775 * abort if this happens, just dump the chunk silently. 5776 */ 5777 switch (SCTP_GET_STATE(stcb)) { 5778 case SCTP_STATE_COOKIE_ECHOED: 5779 /* 5780 * we consider data with valid tags in this state 5781 * shows us the cookie-ack was lost. Imply it was 5782 * there. 5783 */ 5784 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5785 break; 5786 case SCTP_STATE_COOKIE_WAIT: 5787 /* 5788 * We consider OOTB any data sent during asoc setup. 5789 */ 5790 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5791 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5792 msg); 5793 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5794 mflowtype, mflowid, inp->fibnum, 5795 vrf_id, port); 5796 goto out; 5797 /* sa_ignore NOTREACHED */ 5798 break; 5799 case SCTP_STATE_EMPTY: /* should not happen */ 5800 case SCTP_STATE_INUSE: /* should not happen */ 5801 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5802 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5803 default: 5804 goto out; 5805 /* sa_ignore NOTREACHED */ 5806 break; 5807 case SCTP_STATE_OPEN: 5808 case SCTP_STATE_SHUTDOWN_SENT: 5809 break; 5810 } 5811 /* plow through the data chunks while length > offset */ 5812 retval = sctp_process_data(mm, iphlen, &offset, length, 5813 inp, stcb, net, &high_tsn); 5814 if (retval == 2) { 5815 /* 5816 * The association aborted, NO UNLOCK needed since 5817 * the association is destroyed. 5818 */ 5819 stcb = NULL; 5820 goto out; 5821 } 5822 data_processed = 1; 5823 /* 5824 * Anything important needs to have been m_copy'ed in 5825 * process_data 5826 */ 5827 } 5828 5829 /* take care of ecn */ 5830 if ((data_processed == 1) && 5831 (stcb->asoc.ecn_supported == 1) && 5832 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5833 /* Yep, we need to add a ECNE */ 5834 sctp_send_ecn_echo(stcb, net, high_tsn); 5835 } 5836 5837 if ((data_processed == 0) && (fwd_tsn_seen)) { 5838 int was_a_gap; 5839 uint32_t highest_tsn; 5840 5841 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5842 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5843 } else { 5844 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5845 } 5846 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5847 stcb->asoc.send_sack = 1; 5848 sctp_sack_check(stcb, was_a_gap); 5849 } else if (fwd_tsn_seen) { 5850 stcb->asoc.send_sack = 1; 5851 } 5852 /* trigger send of any chunks in queue... */ 5853 trigger_send: 5854 #ifdef SCTP_AUDITING_ENABLED 5855 sctp_audit_log(0xE0, 2); 5856 sctp_auditing(1, inp, stcb, net); 5857 #endif 5858 SCTPDBG(SCTP_DEBUG_INPUT1, 5859 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5860 stcb->asoc.peers_rwnd, 5861 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5862 stcb->asoc.total_flight); 5863 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5864 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5865 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5866 } 5867 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5868 cnt_ctrl_ready || 5869 stcb->asoc.trigger_reset || 5870 ((un_sent) && 5871 (stcb->asoc.peers_rwnd > 0 || 5872 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5873 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5874 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5875 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5876 } 5877 #ifdef SCTP_AUDITING_ENABLED 5878 sctp_audit_log(0xE0, 3); 5879 sctp_auditing(2, inp, stcb, net); 5880 #endif 5881 out: 5882 if (stcb != NULL) { 5883 SCTP_TCB_UNLOCK(stcb); 5884 } 5885 if (inp_decr != NULL) { 5886 /* reduce ref-count */ 5887 SCTP_INP_WLOCK(inp_decr); 5888 SCTP_INP_DECR_REF(inp_decr); 5889 SCTP_INP_WUNLOCK(inp_decr); 5890 } 5891 return; 5892 } 5893 5894 #ifdef INET 5895 void 5896 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5897 { 5898 struct mbuf *m; 5899 int iphlen; 5900 uint32_t vrf_id = 0; 5901 uint8_t ecn_bits; 5902 struct sockaddr_in src, dst; 5903 struct ip *ip; 5904 struct sctphdr *sh; 5905 struct sctp_chunkhdr *ch; 5906 int length, offset; 5907 uint8_t compute_crc; 5908 uint32_t mflowid; 5909 uint8_t mflowtype; 5910 uint16_t fibnum; 5911 5912 iphlen = off; 5913 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5914 SCTP_RELEASE_PKT(i_pak); 5915 return; 5916 } 5917 m = SCTP_HEADER_TO_CHAIN(i_pak); 5918 #ifdef SCTP_MBUF_LOGGING 5919 /* Log in any input mbufs */ 5920 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5921 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5922 } 5923 #endif 5924 #ifdef SCTP_PACKET_LOGGING 5925 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5926 sctp_packet_log(m); 5927 } 5928 #endif 5929 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5930 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5931 m->m_pkthdr.len, 5932 if_name(m->m_pkthdr.rcvif), 5933 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5934 mflowid = m->m_pkthdr.flowid; 5935 mflowtype = M_HASHTYPE_GET(m); 5936 fibnum = M_GETFIB(m); 5937 SCTP_STAT_INCR(sctps_recvpackets); 5938 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5939 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5940 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5941 if (SCTP_BUF_LEN(m) < offset) { 5942 if ((m = m_pullup(m, offset)) == NULL) { 5943 SCTP_STAT_INCR(sctps_hdrops); 5944 return; 5945 } 5946 } 5947 ip = mtod(m, struct ip *); 5948 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5949 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5950 offset -= sizeof(struct sctp_chunkhdr); 5951 memset(&src, 0, sizeof(struct sockaddr_in)); 5952 src.sin_family = AF_INET; 5953 src.sin_len = sizeof(struct sockaddr_in); 5954 src.sin_port = sh->src_port; 5955 src.sin_addr = ip->ip_src; 5956 memset(&dst, 0, sizeof(struct sockaddr_in)); 5957 dst.sin_family = AF_INET; 5958 dst.sin_len = sizeof(struct sockaddr_in); 5959 dst.sin_port = sh->dest_port; 5960 dst.sin_addr = ip->ip_dst; 5961 length = ntohs(ip->ip_len); 5962 /* Validate mbuf chain length with IP payload length. */ 5963 if (SCTP_HEADER_LEN(m) != length) { 5964 SCTPDBG(SCTP_DEBUG_INPUT1, 5965 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5966 SCTP_STAT_INCR(sctps_hdrops); 5967 goto out; 5968 } 5969 /* SCTP does not allow broadcasts or multicasts */ 5970 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5971 goto out; 5972 } 5973 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5974 goto out; 5975 } 5976 ecn_bits = ip->ip_tos; 5977 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5978 SCTP_STAT_INCR(sctps_recvhwcrc); 5979 compute_crc = 0; 5980 } else { 5981 SCTP_STAT_INCR(sctps_recvswcrc); 5982 compute_crc = 1; 5983 } 5984 sctp_common_input_processing(&m, iphlen, offset, length, 5985 (struct sockaddr *)&src, 5986 (struct sockaddr *)&dst, 5987 sh, ch, 5988 compute_crc, 5989 ecn_bits, 5990 mflowtype, mflowid, fibnum, 5991 vrf_id, port); 5992 out: 5993 if (m) { 5994 sctp_m_freem(m); 5995 } 5996 return; 5997 } 5998 5999 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6000 extern int *sctp_cpuarry; 6001 #endif 6002 6003 int 6004 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6005 { 6006 struct mbuf *m; 6007 int off; 6008 6009 m = *mp; 6010 off = *offp; 6011 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6012 if (mp_ncpus > 1) { 6013 struct ip *ip; 6014 struct sctphdr *sh; 6015 int offset; 6016 int cpu_to_use; 6017 uint32_t flowid, tag; 6018 6019 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6020 flowid = m->m_pkthdr.flowid; 6021 } else { 6022 /* 6023 * No flow id built by lower layers fix it so we 6024 * create one. 6025 */ 6026 offset = off + sizeof(struct sctphdr); 6027 if (SCTP_BUF_LEN(m) < offset) { 6028 if ((m = m_pullup(m, offset)) == NULL) { 6029 SCTP_STAT_INCR(sctps_hdrops); 6030 return (IPPROTO_DONE); 6031 } 6032 } 6033 ip = mtod(m, struct ip *); 6034 sh = (struct sctphdr *)((caddr_t)ip + off); 6035 tag = htonl(sh->v_tag); 6036 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6037 m->m_pkthdr.flowid = flowid; 6038 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6039 } 6040 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6041 sctp_queue_to_mcore(m, off, cpu_to_use); 6042 return (IPPROTO_DONE); 6043 } 6044 #endif 6045 sctp_input_with_port(m, off, 0); 6046 return (IPPROTO_DONE); 6047 } 6048 #endif 6049