1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #if defined(INET) || defined(INET6) 51 #include <netinet/udp.h> 52 #endif 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91 { 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* We are only accepting if we have a listening socket. */ 165 if ((stcb == NULL) && 166 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 167 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 168 (!SCTP_IS_LISTENING(inp)))) { 169 /* 170 * FIX ME ?? What about TCP model and we have a 171 * match/restart case? Actually no fix is needed. the lookup 172 * will always find the existing assoc so stcb would not be 173 * NULL. It may be questionable to do this since we COULD 174 * just send back the INIT-ACK and hope that the app did 175 * accept()'s by the time the COOKIE was sent. But there is 176 * a price to pay for COOKIE generation and I don't want to 177 * pay it on the chance that the app will actually do some 178 * accepts(). The App just looses and should NOT be in this 179 * state :-) 180 */ 181 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 182 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 183 "No listener"); 184 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 185 mflowtype, mflowid, inp->fibnum, 186 vrf_id, port); 187 } 188 goto outnow; 189 } 190 if ((stcb != NULL) && 191 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 192 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 193 sctp_send_shutdown_ack(stcb, NULL); 194 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 195 } else { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 197 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 198 src, dst, sh, cp, 199 mflowtype, mflowid, 200 vrf_id, port); 201 } 202 outnow: 203 if (stcb == NULL) { 204 SCTP_INP_RUNLOCK(inp); 205 } 206 } 207 208 /* 209 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 210 */ 211 212 int 213 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 214 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 215 SCTP_UNUSED 216 #endif 217 ) 218 { 219 int unsent_data; 220 unsigned int i; 221 struct sctp_stream_queue_pending *sp; 222 struct sctp_association *asoc; 223 224 /* 225 * This function returns if any stream has true unsent data on it. 226 * Note that as it looks through it will clean up any places that 227 * have old data that has been sent but left at top of stream queue. 228 */ 229 asoc = &stcb->asoc; 230 unsent_data = 0; 231 SCTP_TCB_SEND_LOCK(stcb); 232 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 233 /* Check to see if some data queued */ 234 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 235 /* sa_ignore FREED_MEMORY */ 236 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 237 if (sp == NULL) { 238 continue; 239 } 240 if ((sp->msg_is_complete) && 241 (sp->length == 0) && 242 (sp->sender_all_done)) { 243 /* 244 * We are doing differed cleanup. Last time 245 * through when we took all the data the 246 * sender_all_done was not set. 247 */ 248 if (sp->put_last_out == 0) { 249 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 250 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 251 sp->sender_all_done, 252 sp->length, 253 sp->msg_is_complete, 254 sp->put_last_out); 255 } 256 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 257 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 258 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 259 if (sp->net) { 260 sctp_free_remote_addr(sp->net); 261 sp->net = NULL; 262 } 263 if (sp->data) { 264 sctp_m_freem(sp->data); 265 sp->data = NULL; 266 } 267 sctp_free_a_strmoq(stcb, sp, so_locked); 268 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 269 unsent_data++; 270 } 271 } else { 272 unsent_data++; 273 } 274 if (unsent_data > 0) { 275 break; 276 } 277 } 278 } 279 SCTP_TCB_SEND_UNLOCK(stcb); 280 return (unsent_data); 281 } 282 283 static int 284 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 285 { 286 struct sctp_init *init; 287 struct sctp_association *asoc; 288 struct sctp_nets *lnet; 289 unsigned int i; 290 291 init = &cp->init; 292 asoc = &stcb->asoc; 293 /* save off parameters */ 294 asoc->peer_vtag = ntohl(init->initiate_tag); 295 asoc->peers_rwnd = ntohl(init->a_rwnd); 296 /* init tsn's */ 297 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 298 299 if (!TAILQ_EMPTY(&asoc->nets)) { 300 /* update any ssthresh's that may have a default */ 301 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 302 lnet->ssthresh = asoc->peers_rwnd; 303 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 304 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 305 } 306 } 307 } 308 SCTP_TCB_SEND_LOCK(stcb); 309 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 310 unsigned int newcnt; 311 struct sctp_stream_out *outs; 312 struct sctp_stream_queue_pending *sp, *nsp; 313 struct sctp_tmit_chunk *chk, *nchk; 314 315 /* abandon the upper streams */ 316 newcnt = ntohs(init->num_inbound_streams); 317 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 318 if (chk->rec.data.sid >= newcnt) { 319 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 320 asoc->send_queue_cnt--; 321 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 322 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 323 #ifdef INVARIANTS 324 } else { 325 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 326 #endif 327 } 328 if (chk->data != NULL) { 329 sctp_free_bufspace(stcb, asoc, chk, 1); 330 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 331 0, chk, SCTP_SO_NOT_LOCKED); 332 if (chk->data) { 333 sctp_m_freem(chk->data); 334 chk->data = NULL; 335 } 336 } 337 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 338 /* sa_ignore FREED_MEMORY */ 339 } 340 } 341 if (asoc->strmout) { 342 for (i = newcnt; i < asoc->pre_open_streams; i++) { 343 outs = &asoc->strmout[i]; 344 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 345 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 346 TAILQ_REMOVE(&outs->outqueue, sp, next); 347 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 348 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 349 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 350 if (sp->data) { 351 sctp_m_freem(sp->data); 352 sp->data = NULL; 353 } 354 if (sp->net) { 355 sctp_free_remote_addr(sp->net); 356 sp->net = NULL; 357 } 358 /* Free the chunk */ 359 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 360 /* sa_ignore FREED_MEMORY */ 361 } 362 outs->state = SCTP_STREAM_CLOSED; 363 } 364 } 365 /* cut back the count */ 366 asoc->pre_open_streams = newcnt; 367 } 368 SCTP_TCB_SEND_UNLOCK(stcb); 369 asoc->streamoutcnt = asoc->pre_open_streams; 370 if (asoc->strmout) { 371 for (i = 0; i < asoc->streamoutcnt; i++) { 372 asoc->strmout[i].state = SCTP_STREAM_OPEN; 373 } 374 } 375 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 376 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 377 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 378 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 379 } 380 /* This is the next one we expect */ 381 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 382 383 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 384 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 385 386 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 387 /* open the requested streams */ 388 389 if (asoc->strmin != NULL) { 390 /* Free the old ones */ 391 for (i = 0; i < asoc->streamincnt; i++) { 392 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 393 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 394 } 395 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 396 } 397 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 398 asoc->streamincnt = ntohs(init->num_outbound_streams); 399 } else { 400 asoc->streamincnt = asoc->max_inbound_streams; 401 } 402 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 403 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 404 if (asoc->strmin == NULL) { 405 /* we didn't get memory for the streams! */ 406 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 407 return (-1); 408 } 409 for (i = 0; i < asoc->streamincnt; i++) { 410 asoc->strmin[i].sid = i; 411 asoc->strmin[i].last_mid_delivered = 0xffffffff; 412 TAILQ_INIT(&asoc->strmin[i].inqueue); 413 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 414 asoc->strmin[i].pd_api_started = 0; 415 asoc->strmin[i].delivery_started = 0; 416 } 417 /* 418 * load_address_from_init will put the addresses into the 419 * association when the COOKIE is processed or the INIT-ACK is 420 * processed. Both types of COOKIE's existing and new call this 421 * routine. It will remove addresses that are no longer in the 422 * association (for the restarting case where addresses are 423 * removed). Up front when the INIT arrives we will discard it if it 424 * is a restart and new addresses have been added. 425 */ 426 /* sa_ignore MEMLEAK */ 427 return (0); 428 } 429 430 /* 431 * INIT-ACK message processing/consumption returns value < 0 on error 432 */ 433 static int 434 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 435 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 436 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 437 struct sctp_nets *net, int *abort_no_unlock, 438 uint8_t mflowtype, uint32_t mflowid, 439 uint32_t vrf_id) 440 { 441 struct sctp_association *asoc; 442 struct mbuf *op_err; 443 int retval, abort_flag; 444 uint32_t initack_limit; 445 int nat_friendly = 0; 446 447 /* First verify that we have no illegal param's */ 448 abort_flag = 0; 449 450 op_err = sctp_arethere_unrecognized_parameters(m, 451 (offset + sizeof(struct sctp_init_chunk)), 452 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 453 if (abort_flag) { 454 /* Send an abort and notify peer */ 455 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 456 *abort_no_unlock = 1; 457 return (-1); 458 } 459 asoc = &stcb->asoc; 460 asoc->peer_supports_nat = (uint8_t)nat_friendly; 461 /* process the peer's parameters in the INIT-ACK */ 462 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 463 if (retval < 0) { 464 return (retval); 465 } 466 initack_limit = offset + ntohs(cp->ch.chunk_length); 467 /* load all addresses */ 468 if ((retval = sctp_load_addresses_from_init(stcb, m, 469 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 470 src, dst, NULL, stcb->asoc.port))) { 471 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 472 "Problem with address parameters"); 473 SCTPDBG(SCTP_DEBUG_INPUT1, 474 "Load addresses from INIT causes an abort %d\n", 475 retval); 476 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 477 src, dst, sh, op_err, 478 mflowtype, mflowid, 479 vrf_id, net->port); 480 *abort_no_unlock = 1; 481 return (-1); 482 } 483 /* if the peer doesn't support asconf, flush the asconf queue */ 484 if (asoc->asconf_supported == 0) { 485 struct sctp_asconf_addr *param, *nparam; 486 487 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 488 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 489 SCTP_FREE(param, SCTP_M_ASC_ADDR); 490 } 491 } 492 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 493 stcb->asoc.local_hmacs); 494 if (op_err) { 495 sctp_queue_op_err(stcb, op_err); 496 /* queuing will steal away the mbuf chain to the out queue */ 497 op_err = NULL; 498 } 499 /* extract the cookie and queue it to "echo" it back... */ 500 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 501 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 502 stcb->asoc.overall_error_count, 503 0, 504 SCTP_FROM_SCTP_INPUT, 505 __LINE__); 506 } 507 stcb->asoc.overall_error_count = 0; 508 net->error_count = 0; 509 510 /* 511 * Cancel the INIT timer, We do this first before queueing the 512 * cookie. We always cancel at the primary to assue that we are 513 * canceling the timer started by the INIT which always goes to the 514 * primary. 515 */ 516 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 517 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 518 519 /* calculate the RTO */ 520 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 521 SCTP_RTT_FROM_NON_DATA); 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 uint16_t len; 531 532 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 533 /* We abort with an error of missing mandatory param */ 534 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 535 if (op_err != NULL) { 536 struct sctp_error_missing_param *cause; 537 538 SCTP_BUF_LEN(op_err) = len; 539 cause = mtod(op_err, struct sctp_error_missing_param *); 540 /* Subtract the reserved param */ 541 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 542 cause->cause.length = htons(len); 543 cause->num_missing_params = htonl(1); 544 cause->type[0] = htons(SCTP_STATE_COOKIE); 545 } 546 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 547 src, dst, sh, op_err, 548 mflowtype, mflowid, 549 vrf_id, net->port); 550 *abort_no_unlock = 1; 551 } 552 return (retval); 553 } 554 return (0); 555 } 556 557 static void 558 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 559 struct sctp_tcb *stcb, struct sctp_nets *net) 560 { 561 union sctp_sockstore store; 562 struct sctp_nets *r_net, *f_net; 563 struct timeval tv; 564 int req_prim = 0; 565 uint16_t old_error_counter; 566 567 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 568 /* Invalid length */ 569 return; 570 } 571 memset(&store, 0, sizeof(store)); 572 switch (cp->heartbeat.hb_info.addr_family) { 573 #ifdef INET 574 case AF_INET: 575 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 576 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 577 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 578 store.sin.sin_port = stcb->rport; 579 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 580 sizeof(store.sin.sin_addr)); 581 } else { 582 return; 583 } 584 break; 585 #endif 586 #ifdef INET6 587 case AF_INET6: 588 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 589 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 590 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 591 store.sin6.sin6_port = stcb->rport; 592 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 593 } else { 594 return; 595 } 596 break; 597 #endif 598 default: 599 return; 600 } 601 r_net = sctp_findnet(stcb, &store.sa); 602 if (r_net == NULL) { 603 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 604 return; 605 } 606 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 607 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 608 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 609 /* 610 * If the its a HB and it's random value is correct when can 611 * confirm the destination. 612 */ 613 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 614 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 615 stcb->asoc.primary_destination = r_net; 616 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 617 f_net = TAILQ_FIRST(&stcb->asoc.nets); 618 if (f_net != r_net) { 619 /* 620 * first one on the list is NOT the primary 621 * sctp_cmpaddr() is much more efficient if 622 * the primary is the first on the list, 623 * make it so. 624 */ 625 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 626 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 627 } 628 req_prim = 1; 629 } 630 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 631 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 632 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 633 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 634 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 635 } 636 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 637 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 638 stcb->asoc.overall_error_count, 639 0, 640 SCTP_FROM_SCTP_INPUT, 641 __LINE__); 642 } 643 stcb->asoc.overall_error_count = 0; 644 old_error_counter = r_net->error_count; 645 r_net->error_count = 0; 646 r_net->hb_responded = 1; 647 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 648 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 649 /* Now lets do a RTO with this */ 650 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 651 SCTP_RTT_FROM_NON_DATA); 652 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 653 r_net->dest_state |= SCTP_ADDR_REACHABLE; 654 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 655 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 656 } 657 if (r_net->dest_state & SCTP_ADDR_PF) { 658 r_net->dest_state &= ~SCTP_ADDR_PF; 659 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 660 } 661 if (old_error_counter > 0) { 662 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 663 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 664 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 665 } 666 if (r_net == stcb->asoc.primary_destination) { 667 if (stcb->asoc.alternate) { 668 /* release the alternate, primary is good */ 669 sctp_free_remote_addr(stcb->asoc.alternate); 670 stcb->asoc.alternate = NULL; 671 } 672 } 673 /* Mobility adaptation */ 674 if (req_prim) { 675 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 676 SCTP_MOBILITY_BASE) || 677 sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_FASTHANDOFF)) && 679 sctp_is_mobility_feature_on(stcb->sctp_ep, 680 SCTP_MOBILITY_PRIM_DELETED)) { 681 682 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 683 stcb->sctp_ep, stcb, NULL, 684 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 685 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 686 SCTP_MOBILITY_FASTHANDOFF)) { 687 sctp_assoc_immediate_retrans(stcb, 688 stcb->asoc.primary_destination); 689 } 690 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 691 SCTP_MOBILITY_BASE)) { 692 sctp_move_chunks_from_net(stcb, 693 stcb->asoc.deleted_primary); 694 } 695 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 696 stcb->asoc.deleted_primary); 697 } 698 } 699 } 700 701 static int 702 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 703 { 704 /* 705 * return 0 means we want you to proceed with the abort non-zero 706 * means no abort processing 707 */ 708 struct sctpasochead *head; 709 710 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) || 711 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 712 atomic_add_int(&stcb->asoc.refcnt, 1); 713 SCTP_TCB_UNLOCK(stcb); 714 SCTP_INP_INFO_WLOCK(); 715 SCTP_TCB_LOCK(stcb); 716 atomic_subtract_int(&stcb->asoc.refcnt, 1); 717 } 718 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 719 /* generate a new vtag and send init */ 720 LIST_REMOVE(stcb, sctp_asocs); 721 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 722 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 723 /* 724 * put it in the bucket in the vtag hash of assoc's for the 725 * system 726 */ 727 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 728 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 729 SCTP_INP_INFO_WUNLOCK(); 730 return (1); 731 } 732 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 733 /* 734 * treat like a case where the cookie expired i.e.: - dump 735 * current cookie. - generate a new vtag. - resend init. 736 */ 737 /* generate a new vtag and send init */ 738 LIST_REMOVE(stcb, sctp_asocs); 739 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 740 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 741 sctp_stop_all_cookie_timers(stcb); 742 sctp_toss_old_cookies(stcb, &stcb->asoc); 743 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 744 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 745 /* 746 * put it in the bucket in the vtag hash of assoc's for the 747 * system 748 */ 749 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 750 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 751 SCTP_INP_INFO_WUNLOCK(); 752 return (1); 753 } 754 return (0); 755 } 756 757 static int 758 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 759 struct sctp_nets *net) 760 { 761 /* 762 * return 0 means we want you to proceed with the abort non-zero 763 * means no abort processing 764 */ 765 if (stcb->asoc.auth_supported == 0) { 766 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 767 return (0); 768 } 769 sctp_asconf_send_nat_state_update(stcb, net); 770 return (1); 771 } 772 773 774 /* Returns 1 if the stcb was aborted, 0 otherwise */ 775 static int 776 sctp_handle_abort(struct sctp_abort_chunk *abort, 777 struct sctp_tcb *stcb, struct sctp_nets *net) 778 { 779 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 780 struct socket *so; 781 #endif 782 uint16_t len; 783 uint16_t error; 784 785 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 786 if (stcb == NULL) 787 return (0); 788 789 len = ntohs(abort->ch.chunk_length); 790 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 791 /* 792 * Need to check the cause codes for our two magic nat 793 * aborts which don't kill the assoc necessarily. 794 */ 795 struct sctp_error_cause *cause; 796 797 cause = (struct sctp_error_cause *)(abort + 1); 798 error = ntohs(cause->code); 799 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 800 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 801 abort->ch.chunk_flags); 802 if (sctp_handle_nat_colliding_state(stcb)) { 803 return (0); 804 } 805 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 806 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 807 abort->ch.chunk_flags); 808 if (sctp_handle_nat_missing_state(stcb, net)) { 809 return (0); 810 } 811 } 812 } else { 813 error = 0; 814 } 815 /* stop any receive timers */ 816 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 817 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 818 /* notify user of the abort and clean up... */ 819 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 820 /* free the tcb */ 821 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 822 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 823 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 824 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 825 } 826 #ifdef SCTP_ASOCLOG_OF_TSNS 827 sctp_print_out_track_log(stcb); 828 #endif 829 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 830 so = SCTP_INP_SO(stcb->sctp_ep); 831 atomic_add_int(&stcb->asoc.refcnt, 1); 832 SCTP_TCB_UNLOCK(stcb); 833 SCTP_SOCKET_LOCK(so, 1); 834 SCTP_TCB_LOCK(stcb); 835 atomic_subtract_int(&stcb->asoc.refcnt, 1); 836 #endif 837 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 838 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 839 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 840 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 841 SCTP_SOCKET_UNLOCK(so, 1); 842 #endif 843 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 844 return (1); 845 } 846 847 static void 848 sctp_start_net_timers(struct sctp_tcb *stcb) 849 { 850 uint32_t cnt_hb_sent; 851 struct sctp_nets *net; 852 853 cnt_hb_sent = 0; 854 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 855 /* 856 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 857 * If the dest in unconfirmed send a hb as well if under 858 * max_hb_burst have been sent. 859 */ 860 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 861 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 862 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 863 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 864 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 865 cnt_hb_sent++; 866 } 867 } 868 if (cnt_hb_sent) { 869 sctp_chunk_output(stcb->sctp_ep, stcb, 870 SCTP_OUTPUT_FROM_COOKIE_ACK, 871 SCTP_SO_NOT_LOCKED); 872 } 873 } 874 875 876 static void 877 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 878 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 879 { 880 struct sctp_association *asoc; 881 int some_on_streamwheel; 882 int old_state; 883 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 884 struct socket *so; 885 #endif 886 887 SCTPDBG(SCTP_DEBUG_INPUT2, 888 "sctp_handle_shutdown: handling SHUTDOWN\n"); 889 if (stcb == NULL) 890 return; 891 asoc = &stcb->asoc; 892 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 893 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 894 return; 895 } 896 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 897 /* Shutdown NOT the expected size */ 898 return; 899 } 900 old_state = SCTP_GET_STATE(asoc); 901 sctp_update_acked(stcb, cp, abort_flag); 902 if (*abort_flag) { 903 return; 904 } 905 if (asoc->control_pdapi) { 906 /* 907 * With a normal shutdown we assume the end of last record. 908 */ 909 SCTP_INP_READ_LOCK(stcb->sctp_ep); 910 if (asoc->control_pdapi->on_strm_q) { 911 struct sctp_stream_in *strm; 912 913 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 914 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 915 /* Unordered */ 916 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 917 asoc->control_pdapi->on_strm_q = 0; 918 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 919 /* Ordered */ 920 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 921 asoc->control_pdapi->on_strm_q = 0; 922 #ifdef INVARIANTS 923 } else { 924 panic("Unknown state on ctrl:%p on_strm_q:%d", 925 asoc->control_pdapi, 926 asoc->control_pdapi->on_strm_q); 927 #endif 928 } 929 } 930 asoc->control_pdapi->end_added = 1; 931 asoc->control_pdapi->pdapi_aborted = 1; 932 asoc->control_pdapi = NULL; 933 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 934 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 935 so = SCTP_INP_SO(stcb->sctp_ep); 936 atomic_add_int(&stcb->asoc.refcnt, 1); 937 SCTP_TCB_UNLOCK(stcb); 938 SCTP_SOCKET_LOCK(so, 1); 939 SCTP_TCB_LOCK(stcb); 940 atomic_subtract_int(&stcb->asoc.refcnt, 1); 941 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 942 /* assoc was freed while we were unlocked */ 943 SCTP_SOCKET_UNLOCK(so, 1); 944 return; 945 } 946 #endif 947 if (stcb->sctp_socket) { 948 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 949 } 950 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 951 SCTP_SOCKET_UNLOCK(so, 1); 952 #endif 953 } 954 /* goto SHUTDOWN_RECEIVED state to block new requests */ 955 if (stcb->sctp_socket) { 956 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 957 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 958 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 959 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 960 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 961 /* 962 * notify upper layer that peer has initiated a 963 * shutdown 964 */ 965 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 966 967 /* reset time */ 968 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 969 } 970 } 971 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 972 /* 973 * stop the shutdown timer, since we WILL move to 974 * SHUTDOWN-ACK-SENT. 975 */ 976 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 977 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 978 } 979 /* Now is there unsent data on a stream somewhere? */ 980 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 981 982 if (!TAILQ_EMPTY(&asoc->send_queue) || 983 !TAILQ_EMPTY(&asoc->sent_queue) || 984 some_on_streamwheel) { 985 /* By returning we will push more data out */ 986 return; 987 } else { 988 /* no outstanding data to send, so move on... */ 989 /* send SHUTDOWN-ACK */ 990 /* move to SHUTDOWN-ACK-SENT state */ 991 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 992 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 993 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 994 } 995 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 996 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 997 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 998 sctp_stop_timers_for_shutdown(stcb); 999 sctp_send_shutdown_ack(stcb, net); 1000 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 1001 stcb->sctp_ep, stcb, net); 1002 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1003 sctp_send_shutdown_ack(stcb, net); 1004 } 1005 } 1006 } 1007 1008 static void 1009 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1010 struct sctp_tcb *stcb, 1011 struct sctp_nets *net) 1012 { 1013 struct sctp_association *asoc; 1014 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1015 struct socket *so; 1016 1017 so = SCTP_INP_SO(stcb->sctp_ep); 1018 #endif 1019 SCTPDBG(SCTP_DEBUG_INPUT2, 1020 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1021 if (stcb == NULL) 1022 return; 1023 1024 asoc = &stcb->asoc; 1025 /* process according to association state */ 1026 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 1027 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1028 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1029 sctp_send_shutdown_complete(stcb, net, 1); 1030 SCTP_TCB_UNLOCK(stcb); 1031 return; 1032 } 1033 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1034 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1035 /* unexpected SHUTDOWN-ACK... so ignore... */ 1036 SCTP_TCB_UNLOCK(stcb); 1037 return; 1038 } 1039 if (asoc->control_pdapi) { 1040 /* 1041 * With a normal shutdown we assume the end of last record. 1042 */ 1043 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1044 asoc->control_pdapi->end_added = 1; 1045 asoc->control_pdapi->pdapi_aborted = 1; 1046 asoc->control_pdapi = NULL; 1047 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1049 atomic_add_int(&stcb->asoc.refcnt, 1); 1050 SCTP_TCB_UNLOCK(stcb); 1051 SCTP_SOCKET_LOCK(so, 1); 1052 SCTP_TCB_LOCK(stcb); 1053 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1054 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1055 /* assoc was freed while we were unlocked */ 1056 SCTP_SOCKET_UNLOCK(so, 1); 1057 return; 1058 } 1059 #endif 1060 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1061 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1062 SCTP_SOCKET_UNLOCK(so, 1); 1063 #endif 1064 } 1065 #ifdef INVARIANTS 1066 if (!TAILQ_EMPTY(&asoc->send_queue) || 1067 !TAILQ_EMPTY(&asoc->sent_queue) || 1068 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1069 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1070 } 1071 #endif 1072 /* stop the timer */ 1073 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1074 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1075 /* send SHUTDOWN-COMPLETE */ 1076 sctp_send_shutdown_complete(stcb, net, 0); 1077 /* notify upper layer protocol */ 1078 if (stcb->sctp_socket) { 1079 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1080 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1081 stcb->sctp_socket->so_snd.sb_cc = 0; 1082 } 1083 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1084 } 1085 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1086 /* free the TCB but first save off the ep */ 1087 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1088 atomic_add_int(&stcb->asoc.refcnt, 1); 1089 SCTP_TCB_UNLOCK(stcb); 1090 SCTP_SOCKET_LOCK(so, 1); 1091 SCTP_TCB_LOCK(stcb); 1092 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1093 #endif 1094 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1095 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1096 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1097 SCTP_SOCKET_UNLOCK(so, 1); 1098 #endif 1099 } 1100 1101 static void 1102 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type, 1103 struct sctp_nets *net) 1104 { 1105 switch (chunk_type) { 1106 case SCTP_ASCONF_ACK: 1107 case SCTP_ASCONF: 1108 sctp_asconf_cleanup(stcb, net); 1109 break; 1110 case SCTP_IFORWARD_CUM_TSN: 1111 case SCTP_FORWARD_CUM_TSN: 1112 stcb->asoc.prsctp_supported = 0; 1113 break; 1114 default: 1115 SCTPDBG(SCTP_DEBUG_INPUT2, 1116 "Peer does not support chunk type %d (0x%x).\n", 1117 chunk_type, chunk_type); 1118 break; 1119 } 1120 } 1121 1122 /* 1123 * Skip past the param header and then we will find the param that caused the 1124 * problem. There are a number of param's in a ASCONF OR the prsctp param 1125 * these will turn of specific features. 1126 * XXX: Is this the right thing to do? 1127 */ 1128 static void 1129 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1130 { 1131 switch (parameter_type) { 1132 /* pr-sctp draft */ 1133 case SCTP_PRSCTP_SUPPORTED: 1134 stcb->asoc.prsctp_supported = 0; 1135 break; 1136 case SCTP_SUPPORTED_CHUNK_EXT: 1137 break; 1138 /* draft-ietf-tsvwg-addip-sctp */ 1139 case SCTP_HAS_NAT_SUPPORT: 1140 stcb->asoc.peer_supports_nat = 0; 1141 break; 1142 case SCTP_ADD_IP_ADDRESS: 1143 case SCTP_DEL_IP_ADDRESS: 1144 case SCTP_SET_PRIM_ADDR: 1145 stcb->asoc.asconf_supported = 0; 1146 break; 1147 case SCTP_SUCCESS_REPORT: 1148 case SCTP_ERROR_CAUSE_IND: 1149 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1150 SCTPDBG(SCTP_DEBUG_INPUT2, 1151 "Turning off ASCONF to this strange peer\n"); 1152 stcb->asoc.asconf_supported = 0; 1153 break; 1154 default: 1155 SCTPDBG(SCTP_DEBUG_INPUT2, 1156 "Peer does not support param type %d (0x%x)??\n", 1157 parameter_type, parameter_type); 1158 break; 1159 } 1160 } 1161 1162 static int 1163 sctp_handle_error(struct sctp_chunkhdr *ch, 1164 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1165 { 1166 struct sctp_error_cause *cause; 1167 struct sctp_association *asoc; 1168 uint32_t remaining_length, adjust; 1169 uint16_t code, cause_code, cause_length; 1170 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1171 struct socket *so; 1172 #endif 1173 1174 /* parse through all of the errors and process */ 1175 asoc = &stcb->asoc; 1176 cause = (struct sctp_error_cause *)((caddr_t)ch + 1177 sizeof(struct sctp_chunkhdr)); 1178 remaining_length = ntohs(ch->chunk_length); 1179 if (remaining_length > limit) { 1180 remaining_length = limit; 1181 } 1182 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1183 remaining_length -= sizeof(struct sctp_chunkhdr); 1184 } else { 1185 remaining_length = 0; 1186 } 1187 code = 0; 1188 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1189 /* Process an Error Cause */ 1190 cause_code = ntohs(cause->code); 1191 cause_length = ntohs(cause->length); 1192 if ((cause_length > remaining_length) || (cause_length == 0)) { 1193 /* Invalid cause length, possibly due to truncation. */ 1194 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1195 remaining_length, cause_length); 1196 return (0); 1197 } 1198 if (code == 0) { 1199 /* report the first error cause */ 1200 code = cause_code; 1201 } 1202 switch (cause_code) { 1203 case SCTP_CAUSE_INVALID_STREAM: 1204 case SCTP_CAUSE_MISSING_PARAM: 1205 case SCTP_CAUSE_INVALID_PARAM: 1206 case SCTP_CAUSE_NO_USER_DATA: 1207 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1208 cause_code); 1209 break; 1210 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1211 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1212 ch->chunk_flags); 1213 if (sctp_handle_nat_colliding_state(stcb)) { 1214 return (0); 1215 } 1216 break; 1217 case SCTP_CAUSE_NAT_MISSING_STATE: 1218 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1219 ch->chunk_flags); 1220 if (sctp_handle_nat_missing_state(stcb, net)) { 1221 return (0); 1222 } 1223 break; 1224 case SCTP_CAUSE_STALE_COOKIE: 1225 /* 1226 * We only act if we have echoed a cookie and are 1227 * waiting. 1228 */ 1229 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1230 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1231 struct sctp_error_stale_cookie *stale_cookie; 1232 1233 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1234 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1235 /* Double it to be more robust on RTX */ 1236 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1237 asoc->cookie_preserve_req *= 2; 1238 } else { 1239 asoc->cookie_preserve_req = UINT32_MAX; 1240 } 1241 asoc->stale_cookie_count++; 1242 if (asoc->stale_cookie_count > 1243 asoc->max_init_times) { 1244 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1245 /* now free the asoc */ 1246 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1247 so = SCTP_INP_SO(stcb->sctp_ep); 1248 atomic_add_int(&stcb->asoc.refcnt, 1); 1249 SCTP_TCB_UNLOCK(stcb); 1250 SCTP_SOCKET_LOCK(so, 1); 1251 SCTP_TCB_LOCK(stcb); 1252 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1253 #endif 1254 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1255 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1256 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1257 SCTP_SOCKET_UNLOCK(so, 1); 1258 #endif 1259 return (-1); 1260 } 1261 /* blast back to INIT state */ 1262 sctp_toss_old_cookies(stcb, &stcb->asoc); 1263 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1264 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1265 sctp_stop_all_cookie_timers(stcb); 1266 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1267 } 1268 break; 1269 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1270 /* 1271 * Nothing we can do here, we don't do hostname 1272 * addresses so if the peer does not like my IPv6 1273 * (or IPv4 for that matter) it does not matter. If 1274 * they don't support that type of address, they can 1275 * NOT possibly get that packet type... i.e. with no 1276 * IPv6 you can't receive a IPv6 packet. so we can 1277 * safely ignore this one. If we ever added support 1278 * for HOSTNAME Addresses, then we would need to do 1279 * something here. 1280 */ 1281 break; 1282 case SCTP_CAUSE_UNRECOG_CHUNK: 1283 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1284 struct sctp_error_unrecognized_chunk *unrec_chunk; 1285 1286 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1287 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net); 1288 } 1289 break; 1290 case SCTP_CAUSE_UNRECOG_PARAM: 1291 /* XXX: We only consider the first parameter */ 1292 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1293 struct sctp_paramhdr *unrec_parameter; 1294 1295 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1296 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1297 } 1298 break; 1299 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1300 /* 1301 * We ignore this since the timer will drive out a 1302 * new cookie anyway and there timer will drive us 1303 * to send a SHUTDOWN_COMPLETE. We can't send one 1304 * here since we don't have their tag. 1305 */ 1306 break; 1307 case SCTP_CAUSE_DELETING_LAST_ADDR: 1308 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1309 case SCTP_CAUSE_DELETING_SRC_ADDR: 1310 /* 1311 * We should NOT get these here, but in a 1312 * ASCONF-ACK. 1313 */ 1314 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1315 cause_code); 1316 break; 1317 case SCTP_CAUSE_OUT_OF_RESC: 1318 /* 1319 * And what, pray tell do we do with the fact that 1320 * the peer is out of resources? Not really sure we 1321 * could do anything but abort. I suspect this 1322 * should have came WITH an abort instead of in a 1323 * OP-ERROR. 1324 */ 1325 break; 1326 default: 1327 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1328 cause_code); 1329 break; 1330 } 1331 adjust = SCTP_SIZE32(cause_length); 1332 if (remaining_length >= adjust) { 1333 remaining_length -= adjust; 1334 } else { 1335 remaining_length = 0; 1336 } 1337 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1338 } 1339 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1340 return (0); 1341 } 1342 1343 static int 1344 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1345 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1346 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1347 struct sctp_nets *net, int *abort_no_unlock, 1348 uint8_t mflowtype, uint32_t mflowid, 1349 uint32_t vrf_id) 1350 { 1351 struct sctp_init_ack *init_ack; 1352 struct mbuf *op_err; 1353 1354 SCTPDBG(SCTP_DEBUG_INPUT2, 1355 "sctp_handle_init_ack: handling INIT-ACK\n"); 1356 1357 if (stcb == NULL) { 1358 SCTPDBG(SCTP_DEBUG_INPUT2, 1359 "sctp_handle_init_ack: TCB is null\n"); 1360 return (-1); 1361 } 1362 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1363 /* Invalid length */ 1364 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1365 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1366 src, dst, sh, op_err, 1367 mflowtype, mflowid, 1368 vrf_id, net->port); 1369 *abort_no_unlock = 1; 1370 return (-1); 1371 } 1372 init_ack = &cp->init; 1373 /* validate parameters */ 1374 if (init_ack->initiate_tag == 0) { 1375 /* protocol error... send an abort */ 1376 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1377 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1378 src, dst, sh, op_err, 1379 mflowtype, mflowid, 1380 vrf_id, net->port); 1381 *abort_no_unlock = 1; 1382 return (-1); 1383 } 1384 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1385 /* protocol error... send an abort */ 1386 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1387 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1388 src, dst, sh, op_err, 1389 mflowtype, mflowid, 1390 vrf_id, net->port); 1391 *abort_no_unlock = 1; 1392 return (-1); 1393 } 1394 if (init_ack->num_inbound_streams == 0) { 1395 /* protocol error... send an abort */ 1396 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1397 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1398 src, dst, sh, op_err, 1399 mflowtype, mflowid, 1400 vrf_id, net->port); 1401 *abort_no_unlock = 1; 1402 return (-1); 1403 } 1404 if (init_ack->num_outbound_streams == 0) { 1405 /* protocol error... send an abort */ 1406 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1407 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1408 src, dst, sh, op_err, 1409 mflowtype, mflowid, 1410 vrf_id, net->port); 1411 *abort_no_unlock = 1; 1412 return (-1); 1413 } 1414 /* process according to association state... */ 1415 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1416 case SCTP_STATE_COOKIE_WAIT: 1417 /* this is the expected state for this chunk */ 1418 /* process the INIT-ACK parameters */ 1419 if (stcb->asoc.primary_destination->dest_state & 1420 SCTP_ADDR_UNCONFIRMED) { 1421 /* 1422 * The primary is where we sent the INIT, we can 1423 * always consider it confirmed when the INIT-ACK is 1424 * returned. Do this before we load addresses 1425 * though. 1426 */ 1427 stcb->asoc.primary_destination->dest_state &= 1428 ~SCTP_ADDR_UNCONFIRMED; 1429 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1430 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1431 } 1432 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1433 net, abort_no_unlock, 1434 mflowtype, mflowid, 1435 vrf_id) < 0) { 1436 /* error in parsing parameters */ 1437 return (-1); 1438 } 1439 /* update our state */ 1440 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1441 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1442 1443 /* reset the RTO calc */ 1444 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1445 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1446 stcb->asoc.overall_error_count, 1447 0, 1448 SCTP_FROM_SCTP_INPUT, 1449 __LINE__); 1450 } 1451 stcb->asoc.overall_error_count = 0; 1452 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1453 /* 1454 * collapse the init timer back in case of a exponential 1455 * backoff 1456 */ 1457 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1458 stcb, net); 1459 /* 1460 * the send at the end of the inbound data processing will 1461 * cause the cookie to be sent 1462 */ 1463 break; 1464 case SCTP_STATE_SHUTDOWN_SENT: 1465 /* incorrect state... discard */ 1466 break; 1467 case SCTP_STATE_COOKIE_ECHOED: 1468 /* incorrect state... discard */ 1469 break; 1470 case SCTP_STATE_OPEN: 1471 /* incorrect state... discard */ 1472 break; 1473 case SCTP_STATE_EMPTY: 1474 case SCTP_STATE_INUSE: 1475 default: 1476 /* incorrect state... discard */ 1477 return (-1); 1478 break; 1479 } 1480 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1481 return (0); 1482 } 1483 1484 static struct sctp_tcb * 1485 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1486 struct sockaddr *src, struct sockaddr *dst, 1487 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1488 struct sctp_inpcb *inp, struct sctp_nets **netp, 1489 struct sockaddr *init_src, int *notification, 1490 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1491 uint8_t mflowtype, uint32_t mflowid, 1492 uint32_t vrf_id, uint16_t port); 1493 1494 1495 /* 1496 * handle a state cookie for an existing association m: input packet mbuf 1497 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1498 * "split" mbuf and the cookie signature does not exist offset: offset into 1499 * mbuf to the cookie-echo chunk 1500 */ 1501 static struct sctp_tcb * 1502 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1503 struct sockaddr *src, struct sockaddr *dst, 1504 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1505 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1506 struct sockaddr *init_src, int *notification, 1507 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1508 uint8_t mflowtype, uint32_t mflowid, 1509 uint32_t vrf_id, uint16_t port) 1510 { 1511 struct sctp_association *asoc; 1512 struct sctp_init_chunk *init_cp, init_buf; 1513 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1514 struct sctp_nets *net; 1515 struct mbuf *op_err; 1516 struct timeval old; 1517 int init_offset, initack_offset, i; 1518 int retval; 1519 int spec_flag = 0; 1520 uint32_t how_indx; 1521 #if defined(SCTP_DETAILED_STR_STATS) 1522 int j; 1523 #endif 1524 1525 net = *netp; 1526 /* I know that the TCB is non-NULL from the caller */ 1527 asoc = &stcb->asoc; 1528 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1529 if (asoc->cookie_how[how_indx] == 0) 1530 break; 1531 } 1532 if (how_indx < sizeof(asoc->cookie_how)) { 1533 asoc->cookie_how[how_indx] = 1; 1534 } 1535 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1536 /* SHUTDOWN came in after sending INIT-ACK */ 1537 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1538 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1539 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1540 mflowtype, mflowid, inp->fibnum, 1541 vrf_id, net->port); 1542 if (how_indx < sizeof(asoc->cookie_how)) 1543 asoc->cookie_how[how_indx] = 2; 1544 return (NULL); 1545 } 1546 /* 1547 * find and validate the INIT chunk in the cookie (peer's info) the 1548 * INIT should start after the cookie-echo header struct (chunk 1549 * header, state cookie header struct) 1550 */ 1551 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1552 1553 init_cp = (struct sctp_init_chunk *) 1554 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1555 (uint8_t *)&init_buf); 1556 if (init_cp == NULL) { 1557 /* could not pull a INIT chunk in cookie */ 1558 return (NULL); 1559 } 1560 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1561 return (NULL); 1562 } 1563 /* 1564 * find and validate the INIT-ACK chunk in the cookie (my info) the 1565 * INIT-ACK follows the INIT chunk 1566 */ 1567 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1568 initack_cp = (struct sctp_init_ack_chunk *) 1569 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1570 (uint8_t *)&initack_buf); 1571 if (initack_cp == NULL) { 1572 /* could not pull INIT-ACK chunk in cookie */ 1573 return (NULL); 1574 } 1575 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1576 return (NULL); 1577 } 1578 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1579 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1580 /* 1581 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1582 * to get into the OPEN state 1583 */ 1584 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1585 /*- 1586 * Opps, this means that we somehow generated two vtag's 1587 * the same. I.e. we did: 1588 * Us Peer 1589 * <---INIT(tag=a)------ 1590 * ----INIT-ACK(tag=t)--> 1591 * ----INIT(tag=t)------> *1 1592 * <---INIT-ACK(tag=a)--- 1593 * <----CE(tag=t)------------- *2 1594 * 1595 * At point *1 we should be generating a different 1596 * tag t'. Which means we would throw away the CE and send 1597 * ours instead. Basically this is case C (throw away side). 1598 */ 1599 if (how_indx < sizeof(asoc->cookie_how)) 1600 asoc->cookie_how[how_indx] = 17; 1601 return (NULL); 1602 1603 } 1604 switch (SCTP_GET_STATE(asoc)) { 1605 case SCTP_STATE_COOKIE_WAIT: 1606 case SCTP_STATE_COOKIE_ECHOED: 1607 /* 1608 * INIT was sent but got a COOKIE_ECHO with the 1609 * correct tags... just accept it...but we must 1610 * process the init so that we can make sure we have 1611 * the right seq no's. 1612 */ 1613 /* First we must process the INIT !! */ 1614 retval = sctp_process_init(init_cp, stcb); 1615 if (retval < 0) { 1616 if (how_indx < sizeof(asoc->cookie_how)) 1617 asoc->cookie_how[how_indx] = 3; 1618 return (NULL); 1619 } 1620 /* we have already processed the INIT so no problem */ 1621 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1622 stcb, net, 1623 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1624 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1625 stcb, net, 1626 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1627 /* update current state */ 1628 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1629 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1630 else 1631 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1632 1633 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1634 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1635 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1636 stcb->sctp_ep, stcb, asoc->primary_destination); 1637 } 1638 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1639 sctp_stop_all_cookie_timers(stcb); 1640 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1641 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1642 (!SCTP_IS_LISTENING(inp))) { 1643 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1644 struct socket *so; 1645 #endif 1646 /* 1647 * Here is where collision would go if we 1648 * did a connect() and instead got a 1649 * init/init-ack/cookie done before the 1650 * init-ack came back.. 1651 */ 1652 stcb->sctp_ep->sctp_flags |= 1653 SCTP_PCB_FLAGS_CONNECTED; 1654 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1655 so = SCTP_INP_SO(stcb->sctp_ep); 1656 atomic_add_int(&stcb->asoc.refcnt, 1); 1657 SCTP_TCB_UNLOCK(stcb); 1658 SCTP_SOCKET_LOCK(so, 1); 1659 SCTP_TCB_LOCK(stcb); 1660 atomic_add_int(&stcb->asoc.refcnt, -1); 1661 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1662 SCTP_SOCKET_UNLOCK(so, 1); 1663 return (NULL); 1664 } 1665 #endif 1666 soisconnected(stcb->sctp_socket); 1667 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1668 SCTP_SOCKET_UNLOCK(so, 1); 1669 #endif 1670 } 1671 /* notify upper layer */ 1672 *notification = SCTP_NOTIFY_ASSOC_UP; 1673 /* 1674 * since we did not send a HB make sure we don't 1675 * double things 1676 */ 1677 old.tv_sec = cookie->time_entered.tv_sec; 1678 old.tv_usec = cookie->time_entered.tv_usec; 1679 net->hb_responded = 1; 1680 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1681 &old, 1682 SCTP_RTT_FROM_NON_DATA); 1683 1684 if (stcb->asoc.sctp_autoclose_ticks && 1685 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1686 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1687 inp, stcb, NULL); 1688 } 1689 break; 1690 default: 1691 /* 1692 * we're in the OPEN state (or beyond), so peer must 1693 * have simply lost the COOKIE-ACK 1694 */ 1695 break; 1696 } /* end switch */ 1697 sctp_stop_all_cookie_timers(stcb); 1698 /* 1699 * We ignore the return code here.. not sure if we should 1700 * somehow abort.. but we do have an existing asoc. This 1701 * really should not fail. 1702 */ 1703 if (sctp_load_addresses_from_init(stcb, m, 1704 init_offset + sizeof(struct sctp_init_chunk), 1705 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1706 if (how_indx < sizeof(asoc->cookie_how)) 1707 asoc->cookie_how[how_indx] = 4; 1708 return (NULL); 1709 } 1710 /* respond with a COOKIE-ACK */ 1711 sctp_toss_old_cookies(stcb, asoc); 1712 sctp_send_cookie_ack(stcb); 1713 if (how_indx < sizeof(asoc->cookie_how)) 1714 asoc->cookie_how[how_indx] = 5; 1715 return (stcb); 1716 } 1717 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1718 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1719 cookie->tie_tag_my_vtag == 0 && 1720 cookie->tie_tag_peer_vtag == 0) { 1721 /* 1722 * case C in Section 5.2.4 Table 2: XMOO silently discard 1723 */ 1724 if (how_indx < sizeof(asoc->cookie_how)) 1725 asoc->cookie_how[how_indx] = 6; 1726 return (NULL); 1727 } 1728 /* 1729 * If nat support, and the below and stcb is established, send back 1730 * a ABORT(colliding state) if we are established. 1731 */ 1732 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1733 (asoc->peer_supports_nat) && 1734 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1735 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1736 (asoc->peer_vtag == 0)))) { 1737 /* 1738 * Special case - Peer's support nat. We may have two init's 1739 * that we gave out the same tag on since one was not 1740 * established.. i.e. we get INIT from host-1 behind the nat 1741 * and we respond tag-a, we get a INIT from host-2 behind 1742 * the nat and we get tag-a again. Then we bring up host-1 1743 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1744 * Now we have colliding state. We must send an abort here 1745 * with colliding state indication. 1746 */ 1747 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1748 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1749 mflowtype, mflowid, inp->fibnum, 1750 vrf_id, port); 1751 return (NULL); 1752 } 1753 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1754 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1755 (asoc->peer_vtag == 0))) { 1756 /* 1757 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1758 * should be ok, re-accept peer info 1759 */ 1760 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1761 /* 1762 * Extension of case C. If we hit this, then the 1763 * random number generator returned the same vtag 1764 * when we first sent our INIT-ACK and when we later 1765 * sent our INIT. The side with the seq numbers that 1766 * are different will be the one that normnally 1767 * would have hit case C. This in effect "extends" 1768 * our vtags in this collision case to be 64 bits. 1769 * The same collision could occur aka you get both 1770 * vtag and seq number the same twice in a row.. but 1771 * is much less likely. If it did happen then we 1772 * would proceed through and bring up the assoc.. we 1773 * may end up with the wrong stream setup however.. 1774 * which would be bad.. but there is no way to 1775 * tell.. until we send on a stream that does not 1776 * exist :-) 1777 */ 1778 if (how_indx < sizeof(asoc->cookie_how)) 1779 asoc->cookie_how[how_indx] = 7; 1780 1781 return (NULL); 1782 } 1783 if (how_indx < sizeof(asoc->cookie_how)) 1784 asoc->cookie_how[how_indx] = 8; 1785 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1786 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1787 sctp_stop_all_cookie_timers(stcb); 1788 /* 1789 * since we did not send a HB make sure we don't double 1790 * things 1791 */ 1792 net->hb_responded = 1; 1793 if (stcb->asoc.sctp_autoclose_ticks && 1794 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1795 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1796 NULL); 1797 } 1798 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1799 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1800 1801 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1802 /* 1803 * Ok the peer probably discarded our data (if we 1804 * echoed a cookie+data). So anything on the 1805 * sent_queue should be marked for retransmit, we 1806 * may not get something to kick us so it COULD 1807 * still take a timeout to move these.. but it can't 1808 * hurt to mark them. 1809 */ 1810 struct sctp_tmit_chunk *chk; 1811 1812 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1813 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1814 chk->sent = SCTP_DATAGRAM_RESEND; 1815 sctp_flight_size_decrease(chk); 1816 sctp_total_flight_decrease(stcb, chk); 1817 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1818 spec_flag++; 1819 } 1820 } 1821 1822 } 1823 /* process the INIT info (peer's info) */ 1824 retval = sctp_process_init(init_cp, stcb); 1825 if (retval < 0) { 1826 if (how_indx < sizeof(asoc->cookie_how)) 1827 asoc->cookie_how[how_indx] = 9; 1828 return (NULL); 1829 } 1830 if (sctp_load_addresses_from_init(stcb, m, 1831 init_offset + sizeof(struct sctp_init_chunk), 1832 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1833 if (how_indx < sizeof(asoc->cookie_how)) 1834 asoc->cookie_how[how_indx] = 10; 1835 return (NULL); 1836 } 1837 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1838 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1839 *notification = SCTP_NOTIFY_ASSOC_UP; 1840 1841 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1842 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1843 (!SCTP_IS_LISTENING(inp))) { 1844 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1845 struct socket *so; 1846 #endif 1847 stcb->sctp_ep->sctp_flags |= 1848 SCTP_PCB_FLAGS_CONNECTED; 1849 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1850 so = SCTP_INP_SO(stcb->sctp_ep); 1851 atomic_add_int(&stcb->asoc.refcnt, 1); 1852 SCTP_TCB_UNLOCK(stcb); 1853 SCTP_SOCKET_LOCK(so, 1); 1854 SCTP_TCB_LOCK(stcb); 1855 atomic_add_int(&stcb->asoc.refcnt, -1); 1856 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1857 SCTP_SOCKET_UNLOCK(so, 1); 1858 return (NULL); 1859 } 1860 #endif 1861 soisconnected(stcb->sctp_socket); 1862 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1863 SCTP_SOCKET_UNLOCK(so, 1); 1864 #endif 1865 } 1866 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1867 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1868 else 1869 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1870 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1871 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1872 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1873 } else { 1874 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1875 } 1876 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1877 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1878 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1879 stcb->sctp_ep, stcb, asoc->primary_destination); 1880 } 1881 sctp_stop_all_cookie_timers(stcb); 1882 sctp_toss_old_cookies(stcb, asoc); 1883 sctp_send_cookie_ack(stcb); 1884 if (spec_flag) { 1885 /* 1886 * only if we have retrans set do we do this. What 1887 * this call does is get only the COOKIE-ACK out and 1888 * then when we return the normal call to 1889 * sctp_chunk_output will get the retrans out behind 1890 * this. 1891 */ 1892 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1893 } 1894 if (how_indx < sizeof(asoc->cookie_how)) 1895 asoc->cookie_how[how_indx] = 11; 1896 1897 return (stcb); 1898 } 1899 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1900 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1901 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1902 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1903 cookie->tie_tag_peer_vtag != 0) { 1904 struct sctpasochead *head; 1905 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1906 struct socket *so; 1907 #endif 1908 1909 if (asoc->peer_supports_nat) { 1910 /* 1911 * This is a gross gross hack. Just call the 1912 * cookie_new code since we are allowing a duplicate 1913 * association. I hope this works... 1914 */ 1915 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1916 sh, cookie, cookie_len, 1917 inp, netp, init_src, notification, 1918 auth_skipped, auth_offset, auth_len, 1919 mflowtype, mflowid, 1920 vrf_id, port)); 1921 } 1922 /* 1923 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1924 */ 1925 /* temp code */ 1926 if (how_indx < sizeof(asoc->cookie_how)) 1927 asoc->cookie_how[how_indx] = 12; 1928 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1929 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1930 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1931 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1932 1933 /* notify upper layer */ 1934 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1935 atomic_add_int(&stcb->asoc.refcnt, 1); 1936 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1937 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1938 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1939 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1940 } 1941 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1942 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1943 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1944 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1945 } 1946 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1947 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1948 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1949 stcb->sctp_ep, stcb, asoc->primary_destination); 1950 1951 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1952 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1953 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1954 } 1955 asoc->pre_open_streams = 1956 ntohs(initack_cp->init.num_outbound_streams); 1957 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1958 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1959 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1960 1961 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1962 1963 asoc->str_reset_seq_in = asoc->init_seq_number; 1964 1965 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1966 if (asoc->mapping_array) { 1967 memset(asoc->mapping_array, 0, 1968 asoc->mapping_array_size); 1969 } 1970 if (asoc->nr_mapping_array) { 1971 memset(asoc->nr_mapping_array, 0, 1972 asoc->mapping_array_size); 1973 } 1974 SCTP_TCB_UNLOCK(stcb); 1975 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1976 so = SCTP_INP_SO(stcb->sctp_ep); 1977 SCTP_SOCKET_LOCK(so, 1); 1978 #endif 1979 SCTP_INP_INFO_WLOCK(); 1980 SCTP_INP_WLOCK(stcb->sctp_ep); 1981 SCTP_TCB_LOCK(stcb); 1982 atomic_add_int(&stcb->asoc.refcnt, -1); 1983 /* send up all the data */ 1984 SCTP_TCB_SEND_LOCK(stcb); 1985 1986 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1987 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1988 stcb->asoc.strmout[i].chunks_on_queues = 0; 1989 #if defined(SCTP_DETAILED_STR_STATS) 1990 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1991 asoc->strmout[i].abandoned_sent[j] = 0; 1992 asoc->strmout[i].abandoned_unsent[j] = 0; 1993 } 1994 #else 1995 asoc->strmout[i].abandoned_sent[0] = 0; 1996 asoc->strmout[i].abandoned_unsent[0] = 0; 1997 #endif 1998 stcb->asoc.strmout[i].sid = i; 1999 stcb->asoc.strmout[i].next_mid_ordered = 0; 2000 stcb->asoc.strmout[i].next_mid_unordered = 0; 2001 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2002 } 2003 /* process the INIT-ACK info (my info) */ 2004 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2005 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2006 2007 /* pull from vtag hash */ 2008 LIST_REMOVE(stcb, sctp_asocs); 2009 /* re-insert to new vtag position */ 2010 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2011 SCTP_BASE_INFO(hashasocmark))]; 2012 /* 2013 * put it in the bucket in the vtag hash of assoc's for the 2014 * system 2015 */ 2016 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2017 2018 SCTP_TCB_SEND_UNLOCK(stcb); 2019 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2020 SCTP_INP_INFO_WUNLOCK(); 2021 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2022 SCTP_SOCKET_UNLOCK(so, 1); 2023 #endif 2024 asoc->total_flight = 0; 2025 asoc->total_flight_count = 0; 2026 /* process the INIT info (peer's info) */ 2027 retval = sctp_process_init(init_cp, stcb); 2028 if (retval < 0) { 2029 if (how_indx < sizeof(asoc->cookie_how)) 2030 asoc->cookie_how[how_indx] = 13; 2031 2032 return (NULL); 2033 } 2034 /* 2035 * since we did not send a HB make sure we don't double 2036 * things 2037 */ 2038 net->hb_responded = 1; 2039 2040 if (sctp_load_addresses_from_init(stcb, m, 2041 init_offset + sizeof(struct sctp_init_chunk), 2042 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2043 if (how_indx < sizeof(asoc->cookie_how)) 2044 asoc->cookie_how[how_indx] = 14; 2045 2046 return (NULL); 2047 } 2048 /* respond with a COOKIE-ACK */ 2049 sctp_stop_all_cookie_timers(stcb); 2050 sctp_toss_old_cookies(stcb, asoc); 2051 sctp_send_cookie_ack(stcb); 2052 if (how_indx < sizeof(asoc->cookie_how)) 2053 asoc->cookie_how[how_indx] = 15; 2054 2055 return (stcb); 2056 } 2057 if (how_indx < sizeof(asoc->cookie_how)) 2058 asoc->cookie_how[how_indx] = 16; 2059 /* all other cases... */ 2060 return (NULL); 2061 } 2062 2063 2064 /* 2065 * handle a state cookie for a new association m: input packet mbuf chain-- 2066 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2067 * and the cookie signature does not exist offset: offset into mbuf to the 2068 * cookie-echo chunk length: length of the cookie chunk to: where the init 2069 * was from returns a new TCB 2070 */ 2071 static struct sctp_tcb * 2072 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2073 struct sockaddr *src, struct sockaddr *dst, 2074 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2075 struct sctp_inpcb *inp, struct sctp_nets **netp, 2076 struct sockaddr *init_src, int *notification, 2077 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2078 uint8_t mflowtype, uint32_t mflowid, 2079 uint32_t vrf_id, uint16_t port) 2080 { 2081 struct sctp_tcb *stcb; 2082 struct sctp_init_chunk *init_cp, init_buf; 2083 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2084 union sctp_sockstore store; 2085 struct sctp_association *asoc; 2086 int init_offset, initack_offset, initack_limit; 2087 int retval; 2088 int error = 0; 2089 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2090 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2091 struct socket *so; 2092 2093 so = SCTP_INP_SO(inp); 2094 #endif 2095 2096 /* 2097 * find and validate the INIT chunk in the cookie (peer's info) the 2098 * INIT should start after the cookie-echo header struct (chunk 2099 * header, state cookie header struct) 2100 */ 2101 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2102 init_cp = (struct sctp_init_chunk *) 2103 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2104 (uint8_t *)&init_buf); 2105 if (init_cp == NULL) { 2106 /* could not pull a INIT chunk in cookie */ 2107 SCTPDBG(SCTP_DEBUG_INPUT1, 2108 "process_cookie_new: could not pull INIT chunk hdr\n"); 2109 return (NULL); 2110 } 2111 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2112 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2113 return (NULL); 2114 } 2115 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2116 /* 2117 * find and validate the INIT-ACK chunk in the cookie (my info) the 2118 * INIT-ACK follows the INIT chunk 2119 */ 2120 initack_cp = (struct sctp_init_ack_chunk *) 2121 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2122 (uint8_t *)&initack_buf); 2123 if (initack_cp == NULL) { 2124 /* could not pull INIT-ACK chunk in cookie */ 2125 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2126 return (NULL); 2127 } 2128 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2129 return (NULL); 2130 } 2131 /* 2132 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2133 * "initack_limit" value. This is because the chk_length field 2134 * includes the length of the cookie, but the cookie is omitted when 2135 * the INIT and INIT_ACK are tacked onto the cookie... 2136 */ 2137 initack_limit = offset + cookie_len; 2138 2139 /* 2140 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2141 * and popluate 2142 */ 2143 2144 /* 2145 * Here we do a trick, we set in NULL for the proc/thread argument. 2146 * We do this since in effect we only use the p argument when the 2147 * socket is unbound and we must do an implicit bind. Since we are 2148 * getting a cookie, we cannot be unbound. 2149 */ 2150 stcb = sctp_aloc_assoc(inp, init_src, &error, 2151 ntohl(initack_cp->init.initiate_tag), vrf_id, 2152 ntohs(initack_cp->init.num_outbound_streams), 2153 port, 2154 (struct thread *)NULL 2155 ); 2156 if (stcb == NULL) { 2157 struct mbuf *op_err; 2158 2159 /* memory problem? */ 2160 SCTPDBG(SCTP_DEBUG_INPUT1, 2161 "process_cookie_new: no room for another TCB!\n"); 2162 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2163 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2164 src, dst, sh, op_err, 2165 mflowtype, mflowid, 2166 vrf_id, port); 2167 return (NULL); 2168 } 2169 /* get the correct sctp_nets */ 2170 if (netp) 2171 *netp = sctp_findnet(stcb, init_src); 2172 2173 asoc = &stcb->asoc; 2174 /* get scope variables out of cookie */ 2175 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2176 asoc->scope.site_scope = cookie->site_scope; 2177 asoc->scope.local_scope = cookie->local_scope; 2178 asoc->scope.loopback_scope = cookie->loopback_scope; 2179 2180 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2181 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2182 struct mbuf *op_err; 2183 2184 /* 2185 * Houston we have a problem. The EP changed while the 2186 * cookie was in flight. Only recourse is to abort the 2187 * association. 2188 */ 2189 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2190 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2191 src, dst, sh, op_err, 2192 mflowtype, mflowid, 2193 vrf_id, port); 2194 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2195 atomic_add_int(&stcb->asoc.refcnt, 1); 2196 SCTP_TCB_UNLOCK(stcb); 2197 SCTP_SOCKET_LOCK(so, 1); 2198 SCTP_TCB_LOCK(stcb); 2199 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2200 #endif 2201 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2202 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2203 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2204 SCTP_SOCKET_UNLOCK(so, 1); 2205 #endif 2206 return (NULL); 2207 } 2208 /* process the INIT-ACK info (my info) */ 2209 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2210 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2211 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2212 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2213 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2214 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2215 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2216 asoc->str_reset_seq_in = asoc->init_seq_number; 2217 2218 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2219 2220 /* process the INIT info (peer's info) */ 2221 if (netp) 2222 retval = sctp_process_init(init_cp, stcb); 2223 else 2224 retval = 0; 2225 if (retval < 0) { 2226 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2227 atomic_add_int(&stcb->asoc.refcnt, 1); 2228 SCTP_TCB_UNLOCK(stcb); 2229 SCTP_SOCKET_LOCK(so, 1); 2230 SCTP_TCB_LOCK(stcb); 2231 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2232 #endif 2233 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2234 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2236 SCTP_SOCKET_UNLOCK(so, 1); 2237 #endif 2238 return (NULL); 2239 } 2240 /* load all addresses */ 2241 if (sctp_load_addresses_from_init(stcb, m, 2242 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2243 src, dst, init_src, port)) { 2244 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2245 atomic_add_int(&stcb->asoc.refcnt, 1); 2246 SCTP_TCB_UNLOCK(stcb); 2247 SCTP_SOCKET_LOCK(so, 1); 2248 SCTP_TCB_LOCK(stcb); 2249 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2250 #endif 2251 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2252 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2254 SCTP_SOCKET_UNLOCK(so, 1); 2255 #endif 2256 return (NULL); 2257 } 2258 /* 2259 * verify any preceding AUTH chunk that was skipped 2260 */ 2261 /* pull the local authentication parameters from the cookie/init-ack */ 2262 sctp_auth_get_cookie_params(stcb, m, 2263 initack_offset + sizeof(struct sctp_init_ack_chunk), 2264 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2265 if (auth_skipped) { 2266 struct sctp_auth_chunk *auth; 2267 2268 auth = (struct sctp_auth_chunk *) 2269 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2270 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2271 /* auth HMAC failed, dump the assoc and packet */ 2272 SCTPDBG(SCTP_DEBUG_AUTH1, 2273 "COOKIE-ECHO: AUTH failed\n"); 2274 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2275 atomic_add_int(&stcb->asoc.refcnt, 1); 2276 SCTP_TCB_UNLOCK(stcb); 2277 SCTP_SOCKET_LOCK(so, 1); 2278 SCTP_TCB_LOCK(stcb); 2279 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2280 #endif 2281 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2282 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2283 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2284 SCTP_SOCKET_UNLOCK(so, 1); 2285 #endif 2286 return (NULL); 2287 } else { 2288 /* remaining chunks checked... good to go */ 2289 stcb->asoc.authenticated = 1; 2290 } 2291 } 2292 /* 2293 * if we're doing ASCONFs, check to see if we have any new local 2294 * addresses that need to get added to the peer (eg. addresses 2295 * changed while cookie echo in flight). This needs to be done 2296 * after we go to the OPEN state to do the correct asconf 2297 * processing. else, make sure we have the correct addresses in our 2298 * lists 2299 */ 2300 2301 /* warning, we re-use sin, sin6, sa_store here! */ 2302 /* pull in local_address (our "from" address) */ 2303 switch (cookie->laddr_type) { 2304 #ifdef INET 2305 case SCTP_IPV4_ADDRESS: 2306 /* source addr is IPv4 */ 2307 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2308 store.sin.sin_family = AF_INET; 2309 store.sin.sin_len = sizeof(struct sockaddr_in); 2310 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2311 break; 2312 #endif 2313 #ifdef INET6 2314 case SCTP_IPV6_ADDRESS: 2315 /* source addr is IPv6 */ 2316 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2317 store.sin6.sin6_family = AF_INET6; 2318 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2319 store.sin6.sin6_scope_id = cookie->scope_id; 2320 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2321 break; 2322 #endif 2323 default: 2324 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2325 atomic_add_int(&stcb->asoc.refcnt, 1); 2326 SCTP_TCB_UNLOCK(stcb); 2327 SCTP_SOCKET_LOCK(so, 1); 2328 SCTP_TCB_LOCK(stcb); 2329 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2330 #endif 2331 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2332 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2333 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2334 SCTP_SOCKET_UNLOCK(so, 1); 2335 #endif 2336 return (NULL); 2337 } 2338 2339 /* update current state */ 2340 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2341 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2342 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2343 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2344 stcb->sctp_ep, stcb, asoc->primary_destination); 2345 } 2346 sctp_stop_all_cookie_timers(stcb); 2347 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2348 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2349 2350 /* set up to notify upper layer */ 2351 *notification = SCTP_NOTIFY_ASSOC_UP; 2352 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2353 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2354 (!SCTP_IS_LISTENING(inp))) { 2355 /* 2356 * This is an endpoint that called connect() how it got a 2357 * cookie that is NEW is a bit of a mystery. It must be that 2358 * the INIT was sent, but before it got there.. a complete 2359 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2360 * should have went to the other code.. not here.. oh well.. 2361 * a bit of protection is worth having.. 2362 */ 2363 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2364 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2365 atomic_add_int(&stcb->asoc.refcnt, 1); 2366 SCTP_TCB_UNLOCK(stcb); 2367 SCTP_SOCKET_LOCK(so, 1); 2368 SCTP_TCB_LOCK(stcb); 2369 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2370 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2371 SCTP_SOCKET_UNLOCK(so, 1); 2372 return (NULL); 2373 } 2374 #endif 2375 soisconnected(stcb->sctp_socket); 2376 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2377 SCTP_SOCKET_UNLOCK(so, 1); 2378 #endif 2379 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2380 (SCTP_IS_LISTENING(inp))) { 2381 /* 2382 * We don't want to do anything with this one. Since it is 2383 * the listening guy. The timer will get started for 2384 * accepted connections in the caller. 2385 */ 2386 ; 2387 } 2388 /* since we did not send a HB make sure we don't double things */ 2389 if ((netp) && (*netp)) 2390 (*netp)->hb_responded = 1; 2391 2392 if (stcb->asoc.sctp_autoclose_ticks && 2393 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2394 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2395 } 2396 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2397 if ((netp != NULL) && (*netp != NULL)) { 2398 struct timeval old; 2399 2400 /* calculate the RTT and set the encaps port */ 2401 old.tv_sec = cookie->time_entered.tv_sec; 2402 old.tv_usec = cookie->time_entered.tv_usec; 2403 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2404 &old, SCTP_RTT_FROM_NON_DATA); 2405 } 2406 /* respond with a COOKIE-ACK */ 2407 sctp_send_cookie_ack(stcb); 2408 2409 /* 2410 * check the address lists for any ASCONFs that need to be sent 2411 * AFTER the cookie-ack is sent 2412 */ 2413 sctp_check_address_list(stcb, m, 2414 initack_offset + sizeof(struct sctp_init_ack_chunk), 2415 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2416 &store.sa, cookie->local_scope, cookie->site_scope, 2417 cookie->ipv4_scope, cookie->loopback_scope); 2418 2419 2420 return (stcb); 2421 } 2422 2423 /* 2424 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2425 * we NEED to make sure we are not already using the vtag. If so we 2426 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2427 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2428 SCTP_BASE_INFO(hashasocmark))]; 2429 LIST_FOREACH(stcb, head, sctp_asocs) { 2430 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2431 -- SEND ABORT - TRY AGAIN -- 2432 } 2433 } 2434 */ 2435 2436 /* 2437 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2438 * existing (non-NULL) TCB 2439 */ 2440 static struct mbuf * 2441 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2442 struct sockaddr *src, struct sockaddr *dst, 2443 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2444 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2445 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2446 struct sctp_tcb **locked_tcb, 2447 uint8_t mflowtype, uint32_t mflowid, 2448 uint32_t vrf_id, uint16_t port) 2449 { 2450 struct sctp_state_cookie *cookie; 2451 struct sctp_tcb *l_stcb = *stcb; 2452 struct sctp_inpcb *l_inp; 2453 struct sockaddr *to; 2454 struct sctp_pcb *ep; 2455 struct mbuf *m_sig; 2456 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2457 uint8_t *sig; 2458 uint8_t cookie_ok = 0; 2459 unsigned int sig_offset, cookie_offset; 2460 unsigned int cookie_len; 2461 struct timeval now; 2462 struct timeval time_expires; 2463 int notification = 0; 2464 struct sctp_nets *netl; 2465 int had_a_existing_tcb = 0; 2466 int send_int_conf = 0; 2467 #ifdef INET 2468 struct sockaddr_in sin; 2469 #endif 2470 #ifdef INET6 2471 struct sockaddr_in6 sin6; 2472 #endif 2473 2474 SCTPDBG(SCTP_DEBUG_INPUT2, 2475 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2476 2477 if (inp_p == NULL) { 2478 return (NULL); 2479 } 2480 cookie = &cp->cookie; 2481 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2482 cookie_len = ntohs(cp->ch.chunk_length); 2483 2484 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2485 sizeof(struct sctp_init_chunk) + 2486 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2487 /* cookie too small */ 2488 return (NULL); 2489 } 2490 if ((cookie->peerport != sh->src_port) || 2491 (cookie->myport != sh->dest_port) || 2492 (cookie->my_vtag != sh->v_tag)) { 2493 /* 2494 * invalid ports or bad tag. Note that we always leave the 2495 * v_tag in the header in network order and when we stored 2496 * it in the my_vtag slot we also left it in network order. 2497 * This maintains the match even though it may be in the 2498 * opposite byte order of the machine :-> 2499 */ 2500 return (NULL); 2501 } 2502 /* 2503 * split off the signature into its own mbuf (since it should not be 2504 * calculated in the sctp_hmac_m() call). 2505 */ 2506 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2507 m_sig = m_split(m, sig_offset, M_NOWAIT); 2508 if (m_sig == NULL) { 2509 /* out of memory or ?? */ 2510 return (NULL); 2511 } 2512 #ifdef SCTP_MBUF_LOGGING 2513 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2514 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2515 } 2516 #endif 2517 2518 /* 2519 * compute the signature/digest for the cookie 2520 */ 2521 ep = &(*inp_p)->sctp_ep; 2522 l_inp = *inp_p; 2523 if (l_stcb) { 2524 SCTP_TCB_UNLOCK(l_stcb); 2525 } 2526 SCTP_INP_RLOCK(l_inp); 2527 if (l_stcb) { 2528 SCTP_TCB_LOCK(l_stcb); 2529 } 2530 /* which cookie is it? */ 2531 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2532 (ep->current_secret_number != ep->last_secret_number)) { 2533 /* it's the old cookie */ 2534 (void)sctp_hmac_m(SCTP_HMAC, 2535 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2536 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2537 } else { 2538 /* it's the current cookie */ 2539 (void)sctp_hmac_m(SCTP_HMAC, 2540 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2541 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2542 } 2543 /* get the signature */ 2544 SCTP_INP_RUNLOCK(l_inp); 2545 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2546 if (sig == NULL) { 2547 /* couldn't find signature */ 2548 sctp_m_freem(m_sig); 2549 return (NULL); 2550 } 2551 /* compare the received digest with the computed digest */ 2552 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2553 /* try the old cookie? */ 2554 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2555 (ep->current_secret_number != ep->last_secret_number)) { 2556 /* compute digest with old */ 2557 (void)sctp_hmac_m(SCTP_HMAC, 2558 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2559 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2560 /* compare */ 2561 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2562 cookie_ok = 1; 2563 } 2564 } else { 2565 cookie_ok = 1; 2566 } 2567 2568 /* 2569 * Now before we continue we must reconstruct our mbuf so that 2570 * normal processing of any other chunks will work. 2571 */ 2572 { 2573 struct mbuf *m_at; 2574 2575 m_at = m; 2576 while (SCTP_BUF_NEXT(m_at) != NULL) { 2577 m_at = SCTP_BUF_NEXT(m_at); 2578 } 2579 SCTP_BUF_NEXT(m_at) = m_sig; 2580 } 2581 2582 if (cookie_ok == 0) { 2583 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2584 SCTPDBG(SCTP_DEBUG_INPUT2, 2585 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2586 (uint32_t)offset, cookie_offset, sig_offset); 2587 return (NULL); 2588 } 2589 /* 2590 * check the cookie timestamps to be sure it's not stale 2591 */ 2592 (void)SCTP_GETTIME_TIMEVAL(&now); 2593 /* Expire time is in Ticks, so we convert to seconds */ 2594 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2595 time_expires.tv_usec = cookie->time_entered.tv_usec; 2596 if (timevalcmp(&now, &time_expires, >)) { 2597 /* cookie is stale! */ 2598 struct mbuf *op_err; 2599 struct sctp_error_stale_cookie *cause; 2600 struct timeval diff; 2601 uint32_t staleness; 2602 2603 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2604 0, M_NOWAIT, 1, MT_DATA); 2605 if (op_err == NULL) { 2606 /* FOOBAR */ 2607 return (NULL); 2608 } 2609 /* Set the len */ 2610 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2611 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2612 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2613 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2614 (sizeof(uint32_t)))); 2615 diff = now; 2616 timevalsub(&diff, &time_expires); 2617 if (diff.tv_sec > UINT32_MAX / 1000000) { 2618 staleness = UINT32_MAX; 2619 } else { 2620 staleness = diff.tv_sec * 1000000; 2621 } 2622 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2623 staleness += diff.tv_usec; 2624 } else { 2625 staleness = UINT32_MAX; 2626 } 2627 cause->stale_time = htonl(staleness); 2628 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2629 mflowtype, mflowid, l_inp->fibnum, 2630 vrf_id, port); 2631 return (NULL); 2632 } 2633 /* 2634 * Now we must see with the lookup address if we have an existing 2635 * asoc. This will only happen if we were in the COOKIE-WAIT state 2636 * and a INIT collided with us and somewhere the peer sent the 2637 * cookie on another address besides the single address our assoc 2638 * had for him. In this case we will have one of the tie-tags set at 2639 * least AND the address field in the cookie can be used to look it 2640 * up. 2641 */ 2642 to = NULL; 2643 switch (cookie->addr_type) { 2644 #ifdef INET6 2645 case SCTP_IPV6_ADDRESS: 2646 memset(&sin6, 0, sizeof(sin6)); 2647 sin6.sin6_family = AF_INET6; 2648 sin6.sin6_len = sizeof(sin6); 2649 sin6.sin6_port = sh->src_port; 2650 sin6.sin6_scope_id = cookie->scope_id; 2651 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2652 sizeof(sin6.sin6_addr.s6_addr)); 2653 to = (struct sockaddr *)&sin6; 2654 break; 2655 #endif 2656 #ifdef INET 2657 case SCTP_IPV4_ADDRESS: 2658 memset(&sin, 0, sizeof(sin)); 2659 sin.sin_family = AF_INET; 2660 sin.sin_len = sizeof(sin); 2661 sin.sin_port = sh->src_port; 2662 sin.sin_addr.s_addr = cookie->address[0]; 2663 to = (struct sockaddr *)&sin; 2664 break; 2665 #endif 2666 default: 2667 /* This should not happen */ 2668 return (NULL); 2669 } 2670 if (*stcb == NULL) { 2671 /* Yep, lets check */ 2672 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2673 if (*stcb == NULL) { 2674 /* 2675 * We should have only got back the same inp. If we 2676 * got back a different ep we have a problem. The 2677 * original findep got back l_inp and now 2678 */ 2679 if (l_inp != *inp_p) { 2680 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2681 } 2682 } else { 2683 if (*locked_tcb == NULL) { 2684 /* 2685 * In this case we found the assoc only 2686 * after we locked the create lock. This 2687 * means we are in a colliding case and we 2688 * must make sure that we unlock the tcb if 2689 * its one of the cases where we throw away 2690 * the incoming packets. 2691 */ 2692 *locked_tcb = *stcb; 2693 2694 /* 2695 * We must also increment the inp ref count 2696 * since the ref_count flags was set when we 2697 * did not find the TCB, now we found it 2698 * which reduces the refcount.. we must 2699 * raise it back out to balance it all :-) 2700 */ 2701 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2702 if ((*stcb)->sctp_ep != l_inp) { 2703 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2704 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2705 } 2706 } 2707 } 2708 } 2709 cookie_len -= SCTP_SIGNATURE_SIZE; 2710 if (*stcb == NULL) { 2711 /* this is the "normal" case... get a new TCB */ 2712 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2713 cookie, cookie_len, *inp_p, 2714 netp, to, ¬ification, 2715 auth_skipped, auth_offset, auth_len, 2716 mflowtype, mflowid, 2717 vrf_id, port); 2718 } else { 2719 /* this is abnormal... cookie-echo on existing TCB */ 2720 had_a_existing_tcb = 1; 2721 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2722 src, dst, sh, 2723 cookie, cookie_len, *inp_p, *stcb, netp, to, 2724 ¬ification, auth_skipped, auth_offset, auth_len, 2725 mflowtype, mflowid, 2726 vrf_id, port); 2727 } 2728 2729 if (*stcb == NULL) { 2730 /* still no TCB... must be bad cookie-echo */ 2731 return (NULL); 2732 } 2733 if (*netp != NULL) { 2734 (*netp)->flowtype = mflowtype; 2735 (*netp)->flowid = mflowid; 2736 } 2737 /* 2738 * Ok, we built an association so confirm the address we sent the 2739 * INIT-ACK to. 2740 */ 2741 netl = sctp_findnet(*stcb, to); 2742 /* 2743 * This code should in theory NOT run but 2744 */ 2745 if (netl == NULL) { 2746 /* TSNH! Huh, why do I need to add this address here? */ 2747 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2748 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2749 return (NULL); 2750 } 2751 netl = sctp_findnet(*stcb, to); 2752 } 2753 if (netl) { 2754 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2755 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2756 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2757 netl); 2758 send_int_conf = 1; 2759 } 2760 } 2761 sctp_start_net_timers(*stcb); 2762 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2763 if (!had_a_existing_tcb || 2764 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2765 /* 2766 * If we have a NEW cookie or the connect never 2767 * reached the connected state during collision we 2768 * must do the TCP accept thing. 2769 */ 2770 struct socket *so, *oso; 2771 struct sctp_inpcb *inp; 2772 2773 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2774 /* 2775 * For a restart we will keep the same 2776 * socket, no need to do anything. I THINK!! 2777 */ 2778 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2779 if (send_int_conf) { 2780 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2781 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2782 } 2783 return (m); 2784 } 2785 oso = (*inp_p)->sctp_socket; 2786 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2787 SCTP_TCB_UNLOCK((*stcb)); 2788 CURVNET_SET(oso->so_vnet); 2789 so = sonewconn(oso, 0 2790 ); 2791 CURVNET_RESTORE(); 2792 SCTP_TCB_LOCK((*stcb)); 2793 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2794 2795 if (so == NULL) { 2796 struct mbuf *op_err; 2797 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2798 struct socket *pcb_so; 2799 #endif 2800 /* Too many sockets */ 2801 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2802 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2803 sctp_abort_association(*inp_p, NULL, m, iphlen, 2804 src, dst, sh, op_err, 2805 mflowtype, mflowid, 2806 vrf_id, port); 2807 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2808 pcb_so = SCTP_INP_SO(*inp_p); 2809 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2810 SCTP_TCB_UNLOCK((*stcb)); 2811 SCTP_SOCKET_LOCK(pcb_so, 1); 2812 SCTP_TCB_LOCK((*stcb)); 2813 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2814 #endif 2815 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2816 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2817 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2818 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2819 #endif 2820 return (NULL); 2821 } 2822 inp = (struct sctp_inpcb *)so->so_pcb; 2823 SCTP_INP_INCR_REF(inp); 2824 /* 2825 * We add the unbound flag here so that if we get an 2826 * soabort() before we get the move_pcb done, we 2827 * will properly cleanup. 2828 */ 2829 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2830 SCTP_PCB_FLAGS_CONNECTED | 2831 SCTP_PCB_FLAGS_IN_TCPPOOL | 2832 SCTP_PCB_FLAGS_UNBOUND | 2833 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2834 SCTP_PCB_FLAGS_DONT_WAKE); 2835 inp->sctp_features = (*inp_p)->sctp_features; 2836 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2837 inp->sctp_socket = so; 2838 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2839 inp->max_cwnd = (*inp_p)->max_cwnd; 2840 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2841 inp->ecn_supported = (*inp_p)->ecn_supported; 2842 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2843 inp->auth_supported = (*inp_p)->auth_supported; 2844 inp->asconf_supported = (*inp_p)->asconf_supported; 2845 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2846 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2847 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2848 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2849 inp->sctp_context = (*inp_p)->sctp_context; 2850 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2851 inp->fibnum = (*inp_p)->fibnum; 2852 inp->inp_starting_point_for_iterator = NULL; 2853 /* 2854 * copy in the authentication parameters from the 2855 * original endpoint 2856 */ 2857 if (inp->sctp_ep.local_hmacs) 2858 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2859 inp->sctp_ep.local_hmacs = 2860 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2861 if (inp->sctp_ep.local_auth_chunks) 2862 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2863 inp->sctp_ep.local_auth_chunks = 2864 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2865 2866 /* 2867 * Now we must move it from one hash table to 2868 * another and get the tcb in the right place. 2869 */ 2870 2871 /* 2872 * This is where the one-2-one socket is put into 2873 * the accept state waiting for the accept! 2874 */ 2875 if (*stcb) { 2876 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2877 } 2878 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2879 2880 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2881 SCTP_TCB_UNLOCK((*stcb)); 2882 2883 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2884 0); 2885 SCTP_TCB_LOCK((*stcb)); 2886 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2887 2888 2889 /* 2890 * now we must check to see if we were aborted while 2891 * the move was going on and the lock/unlock 2892 * happened. 2893 */ 2894 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2895 /* 2896 * yep it was, we leave the assoc attached 2897 * to the socket since the sctp_inpcb_free() 2898 * call will send an abort for us. 2899 */ 2900 SCTP_INP_DECR_REF(inp); 2901 return (NULL); 2902 } 2903 SCTP_INP_DECR_REF(inp); 2904 /* Switch over to the new guy */ 2905 *inp_p = inp; 2906 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2907 if (send_int_conf) { 2908 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2909 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2910 } 2911 /* 2912 * Pull it from the incomplete queue and wake the 2913 * guy 2914 */ 2915 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2916 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2917 SCTP_TCB_UNLOCK((*stcb)); 2918 SCTP_SOCKET_LOCK(so, 1); 2919 #endif 2920 soisconnected(so); 2921 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2922 SCTP_TCB_LOCK((*stcb)); 2923 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2924 SCTP_SOCKET_UNLOCK(so, 1); 2925 #endif 2926 return (m); 2927 } 2928 } 2929 if (notification) { 2930 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2931 } 2932 if (send_int_conf) { 2933 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2934 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2935 } 2936 return (m); 2937 } 2938 2939 static void 2940 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2941 struct sctp_tcb *stcb, struct sctp_nets *net) 2942 { 2943 /* cp must not be used, others call this without a c-ack :-) */ 2944 struct sctp_association *asoc; 2945 2946 SCTPDBG(SCTP_DEBUG_INPUT2, 2947 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2948 if ((stcb == NULL) || (net == NULL)) { 2949 return; 2950 } 2951 asoc = &stcb->asoc; 2952 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2953 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2954 asoc->overall_error_count, 2955 0, 2956 SCTP_FROM_SCTP_INPUT, 2957 __LINE__); 2958 } 2959 asoc->overall_error_count = 0; 2960 sctp_stop_all_cookie_timers(stcb); 2961 /* process according to association state */ 2962 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2963 /* state change only needed when I am in right state */ 2964 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2965 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2966 sctp_start_net_timers(stcb); 2967 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2968 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2969 stcb->sctp_ep, stcb, asoc->primary_destination); 2970 2971 } 2972 /* update RTO */ 2973 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2974 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2975 if (asoc->overall_error_count == 0) { 2976 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2977 &asoc->time_entered, 2978 SCTP_RTT_FROM_NON_DATA); 2979 } 2980 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2981 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2982 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2983 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2984 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2985 struct socket *so; 2986 2987 #endif 2988 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2989 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2990 so = SCTP_INP_SO(stcb->sctp_ep); 2991 atomic_add_int(&stcb->asoc.refcnt, 1); 2992 SCTP_TCB_UNLOCK(stcb); 2993 SCTP_SOCKET_LOCK(so, 1); 2994 SCTP_TCB_LOCK(stcb); 2995 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2996 #endif 2997 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2998 soisconnected(stcb->sctp_socket); 2999 } 3000 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3001 SCTP_SOCKET_UNLOCK(so, 1); 3002 #endif 3003 } 3004 /* 3005 * since we did not send a HB make sure we don't double 3006 * things 3007 */ 3008 net->hb_responded = 1; 3009 3010 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3011 /* 3012 * We don't need to do the asconf thing, nor hb or 3013 * autoclose if the socket is closed. 3014 */ 3015 goto closed_socket; 3016 } 3017 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3018 stcb, net); 3019 3020 3021 if (stcb->asoc.sctp_autoclose_ticks && 3022 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3023 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3024 stcb->sctp_ep, stcb, NULL); 3025 } 3026 /* 3027 * send ASCONF if parameters are pending and ASCONFs are 3028 * allowed (eg. addresses changed when init/cookie echo were 3029 * in flight) 3030 */ 3031 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3032 (stcb->asoc.asconf_supported == 1) && 3033 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3034 #ifdef SCTP_TIMER_BASED_ASCONF 3035 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3036 stcb->sctp_ep, stcb, 3037 stcb->asoc.primary_destination); 3038 #else 3039 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3040 SCTP_ADDR_NOT_LOCKED); 3041 #endif 3042 } 3043 } 3044 closed_socket: 3045 /* Toss the cookie if I can */ 3046 sctp_toss_old_cookies(stcb, asoc); 3047 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3048 /* Restart the timer if we have pending data */ 3049 struct sctp_tmit_chunk *chk; 3050 3051 chk = TAILQ_FIRST(&asoc->sent_queue); 3052 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3053 } 3054 } 3055 3056 static void 3057 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3058 struct sctp_tcb *stcb) 3059 { 3060 struct sctp_nets *net; 3061 struct sctp_tmit_chunk *lchk; 3062 struct sctp_ecne_chunk bkup; 3063 uint8_t override_bit; 3064 uint32_t tsn, window_data_tsn; 3065 int len; 3066 unsigned int pkt_cnt; 3067 3068 len = ntohs(cp->ch.chunk_length); 3069 if ((len != sizeof(struct sctp_ecne_chunk)) && 3070 (len != sizeof(struct old_sctp_ecne_chunk))) { 3071 return; 3072 } 3073 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3074 /* Its the old format */ 3075 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3076 bkup.num_pkts_since_cwr = htonl(1); 3077 cp = &bkup; 3078 } 3079 SCTP_STAT_INCR(sctps_recvecne); 3080 tsn = ntohl(cp->tsn); 3081 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3082 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3083 if (lchk == NULL) { 3084 window_data_tsn = stcb->asoc.sending_seq - 1; 3085 } else { 3086 window_data_tsn = lchk->rec.data.tsn; 3087 } 3088 3089 /* Find where it was sent to if possible. */ 3090 net = NULL; 3091 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3092 if (lchk->rec.data.tsn == tsn) { 3093 net = lchk->whoTo; 3094 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3095 break; 3096 } 3097 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3098 break; 3099 } 3100 } 3101 if (net == NULL) { 3102 /* 3103 * What to do. A previous send of a CWR was possibly lost. 3104 * See how old it is, we may have it marked on the actual 3105 * net. 3106 */ 3107 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3108 if (tsn == net->last_cwr_tsn) { 3109 /* Found him, send it off */ 3110 break; 3111 } 3112 } 3113 if (net == NULL) { 3114 /* 3115 * If we reach here, we need to send a special CWR 3116 * that says hey, we did this a long time ago and 3117 * you lost the response. 3118 */ 3119 net = TAILQ_FIRST(&stcb->asoc.nets); 3120 if (net == NULL) { 3121 /* TSNH */ 3122 return; 3123 } 3124 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3125 } else { 3126 override_bit = 0; 3127 } 3128 } else { 3129 override_bit = 0; 3130 } 3131 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3132 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3133 /* 3134 * JRS - Use the congestion control given in the pluggable 3135 * CC module 3136 */ 3137 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3138 /* 3139 * We reduce once every RTT. So we will only lower cwnd at 3140 * the next sending seq i.e. the window_data_tsn 3141 */ 3142 net->cwr_window_tsn = window_data_tsn; 3143 net->ecn_ce_pkt_cnt += pkt_cnt; 3144 net->lost_cnt = pkt_cnt; 3145 net->last_cwr_tsn = tsn; 3146 } else { 3147 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3148 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3149 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3150 /* 3151 * Another loss in the same window update how many 3152 * marks/packets lost we have had. 3153 */ 3154 int cnt = 1; 3155 3156 if (pkt_cnt > net->lost_cnt) { 3157 /* Should be the case */ 3158 cnt = (pkt_cnt - net->lost_cnt); 3159 net->ecn_ce_pkt_cnt += cnt; 3160 } 3161 net->lost_cnt = pkt_cnt; 3162 net->last_cwr_tsn = tsn; 3163 /* 3164 * Most CC functions will ignore this call, since we 3165 * are in-window yet of the initial CE the peer saw. 3166 */ 3167 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3168 } 3169 } 3170 /* 3171 * We always send a CWR this way if our previous one was lost our 3172 * peer will get an update, or if it is not time again to reduce we 3173 * still get the cwr to the peer. Note we set the override when we 3174 * could not find the TSN on the chunk or the destination network. 3175 */ 3176 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3177 } 3178 3179 static void 3180 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3181 { 3182 /* 3183 * Here we get a CWR from the peer. We must look in the outqueue and 3184 * make sure that we have a covered ECNE in the control chunk part. 3185 * If so remove it. 3186 */ 3187 struct sctp_tmit_chunk *chk, *nchk; 3188 struct sctp_ecne_chunk *ecne; 3189 int override; 3190 uint32_t cwr_tsn; 3191 3192 cwr_tsn = ntohl(cp->tsn); 3193 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3194 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3195 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3196 continue; 3197 } 3198 if ((override == 0) && (chk->whoTo != net)) { 3199 /* Must be from the right src unless override is set */ 3200 continue; 3201 } 3202 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3203 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3204 /* this covers this ECNE, we can remove it */ 3205 stcb->asoc.ecn_echo_cnt_onq--; 3206 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3207 sctp_next); 3208 sctp_m_freem(chk->data); 3209 chk->data = NULL; 3210 stcb->asoc.ctrl_queue_cnt--; 3211 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3212 if (override == 0) { 3213 break; 3214 } 3215 } 3216 } 3217 } 3218 3219 static void 3220 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3221 struct sctp_tcb *stcb, struct sctp_nets *net) 3222 { 3223 struct sctp_association *asoc; 3224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3225 struct socket *so; 3226 #endif 3227 3228 SCTPDBG(SCTP_DEBUG_INPUT2, 3229 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3230 if (stcb == NULL) 3231 return; 3232 3233 asoc = &stcb->asoc; 3234 /* process according to association state */ 3235 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3236 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3237 SCTPDBG(SCTP_DEBUG_INPUT2, 3238 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3239 SCTP_TCB_UNLOCK(stcb); 3240 return; 3241 } 3242 /* notify upper layer protocol */ 3243 if (stcb->sctp_socket) { 3244 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3245 } 3246 #ifdef INVARIANTS 3247 if (!TAILQ_EMPTY(&asoc->send_queue) || 3248 !TAILQ_EMPTY(&asoc->sent_queue) || 3249 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3250 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3251 } 3252 #endif 3253 /* stop the timer */ 3254 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3255 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3256 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3257 /* free the TCB */ 3258 SCTPDBG(SCTP_DEBUG_INPUT2, 3259 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3260 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3261 so = SCTP_INP_SO(stcb->sctp_ep); 3262 atomic_add_int(&stcb->asoc.refcnt, 1); 3263 SCTP_TCB_UNLOCK(stcb); 3264 SCTP_SOCKET_LOCK(so, 1); 3265 SCTP_TCB_LOCK(stcb); 3266 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3267 #endif 3268 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3269 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3270 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3271 SCTP_SOCKET_UNLOCK(so, 1); 3272 #endif 3273 return; 3274 } 3275 3276 static int 3277 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3278 struct sctp_nets *net, uint8_t flg) 3279 { 3280 switch (desc->chunk_type) { 3281 case SCTP_DATA: 3282 /* find the tsn to resend (possibly */ 3283 { 3284 uint32_t tsn; 3285 struct sctp_tmit_chunk *tp1; 3286 3287 tsn = ntohl(desc->tsn_ifany); 3288 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3289 if (tp1->rec.data.tsn == tsn) { 3290 /* found it */ 3291 break; 3292 } 3293 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3294 /* not found */ 3295 tp1 = NULL; 3296 break; 3297 } 3298 } 3299 if (tp1 == NULL) { 3300 /* 3301 * Do it the other way , aka without paying 3302 * attention to queue seq order. 3303 */ 3304 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3305 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3306 if (tp1->rec.data.tsn == tsn) { 3307 /* found it */ 3308 break; 3309 } 3310 } 3311 } 3312 if (tp1 == NULL) { 3313 SCTP_STAT_INCR(sctps_pdrptsnnf); 3314 } 3315 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3316 uint8_t *ddp; 3317 3318 if (((flg & SCTP_BADCRC) == 0) && 3319 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3320 return (0); 3321 } 3322 if ((stcb->asoc.peers_rwnd == 0) && 3323 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3324 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3325 return (0); 3326 } 3327 if (stcb->asoc.peers_rwnd == 0 && 3328 (flg & SCTP_FROM_MIDDLE_BOX)) { 3329 SCTP_STAT_INCR(sctps_pdrpdizrw); 3330 return (0); 3331 } 3332 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3333 sizeof(struct sctp_data_chunk)); 3334 { 3335 unsigned int iii; 3336 3337 for (iii = 0; iii < sizeof(desc->data_bytes); 3338 iii++) { 3339 if (ddp[iii] != desc->data_bytes[iii]) { 3340 SCTP_STAT_INCR(sctps_pdrpbadd); 3341 return (-1); 3342 } 3343 } 3344 } 3345 3346 if (tp1->do_rtt) { 3347 /* 3348 * this guy had a RTO calculation 3349 * pending on it, cancel it 3350 */ 3351 if (tp1->whoTo->rto_needed == 0) { 3352 tp1->whoTo->rto_needed = 1; 3353 } 3354 tp1->do_rtt = 0; 3355 } 3356 SCTP_STAT_INCR(sctps_pdrpmark); 3357 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3358 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3359 /* 3360 * mark it as if we were doing a FR, since 3361 * we will be getting gap ack reports behind 3362 * the info from the router. 3363 */ 3364 tp1->rec.data.doing_fast_retransmit = 1; 3365 /* 3366 * mark the tsn with what sequences can 3367 * cause a new FR. 3368 */ 3369 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3370 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3371 } else { 3372 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3373 } 3374 3375 /* restart the timer */ 3376 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3377 stcb, tp1->whoTo, 3378 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3379 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3380 stcb, tp1->whoTo); 3381 3382 /* fix counts and things */ 3383 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3384 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3385 tp1->whoTo->flight_size, 3386 tp1->book_size, 3387 (uint32_t)(uintptr_t)stcb, 3388 tp1->rec.data.tsn); 3389 } 3390 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3391 sctp_flight_size_decrease(tp1); 3392 sctp_total_flight_decrease(stcb, tp1); 3393 } 3394 tp1->sent = SCTP_DATAGRAM_RESEND; 3395 } { 3396 /* audit code */ 3397 unsigned int audit; 3398 3399 audit = 0; 3400 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3401 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3402 audit++; 3403 } 3404 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3405 sctp_next) { 3406 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3407 audit++; 3408 } 3409 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3410 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3411 audit, stcb->asoc.sent_queue_retran_cnt); 3412 #ifndef SCTP_AUDITING_ENABLED 3413 stcb->asoc.sent_queue_retran_cnt = audit; 3414 #endif 3415 } 3416 } 3417 } 3418 break; 3419 case SCTP_ASCONF: 3420 { 3421 struct sctp_tmit_chunk *asconf; 3422 3423 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3424 sctp_next) { 3425 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3426 break; 3427 } 3428 } 3429 if (asconf) { 3430 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3431 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3432 asconf->sent = SCTP_DATAGRAM_RESEND; 3433 asconf->snd_count--; 3434 } 3435 } 3436 break; 3437 case SCTP_INITIATION: 3438 /* resend the INIT */ 3439 stcb->asoc.dropped_special_cnt++; 3440 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3441 /* 3442 * If we can get it in, in a few attempts we do 3443 * this, otherwise we let the timer fire. 3444 */ 3445 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3446 stcb, net, 3447 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3448 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3449 } 3450 break; 3451 case SCTP_SELECTIVE_ACK: 3452 case SCTP_NR_SELECTIVE_ACK: 3453 /* resend the sack */ 3454 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3455 break; 3456 case SCTP_HEARTBEAT_REQUEST: 3457 /* resend a demand HB */ 3458 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3459 /* 3460 * Only retransmit if we KNOW we wont destroy the 3461 * tcb 3462 */ 3463 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3464 } 3465 break; 3466 case SCTP_SHUTDOWN: 3467 sctp_send_shutdown(stcb, net); 3468 break; 3469 case SCTP_SHUTDOWN_ACK: 3470 sctp_send_shutdown_ack(stcb, net); 3471 break; 3472 case SCTP_COOKIE_ECHO: 3473 { 3474 struct sctp_tmit_chunk *cookie; 3475 3476 cookie = NULL; 3477 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3478 sctp_next) { 3479 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3480 break; 3481 } 3482 } 3483 if (cookie) { 3484 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3485 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3486 cookie->sent = SCTP_DATAGRAM_RESEND; 3487 sctp_stop_all_cookie_timers(stcb); 3488 } 3489 } 3490 break; 3491 case SCTP_COOKIE_ACK: 3492 sctp_send_cookie_ack(stcb); 3493 break; 3494 case SCTP_ASCONF_ACK: 3495 /* resend last asconf ack */ 3496 sctp_send_asconf_ack(stcb); 3497 break; 3498 case SCTP_IFORWARD_CUM_TSN: 3499 case SCTP_FORWARD_CUM_TSN: 3500 send_forward_tsn(stcb, &stcb->asoc); 3501 break; 3502 /* can't do anything with these */ 3503 case SCTP_PACKET_DROPPED: 3504 case SCTP_INITIATION_ACK: /* this should not happen */ 3505 case SCTP_HEARTBEAT_ACK: 3506 case SCTP_ABORT_ASSOCIATION: 3507 case SCTP_OPERATION_ERROR: 3508 case SCTP_SHUTDOWN_COMPLETE: 3509 case SCTP_ECN_ECHO: 3510 case SCTP_ECN_CWR: 3511 default: 3512 break; 3513 } 3514 return (0); 3515 } 3516 3517 void 3518 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3519 { 3520 uint32_t i; 3521 uint16_t temp; 3522 3523 /* 3524 * We set things to 0xffffffff since this is the last delivered 3525 * sequence and we will be sending in 0 after the reset. 3526 */ 3527 3528 if (number_entries) { 3529 for (i = 0; i < number_entries; i++) { 3530 temp = ntohs(list[i]); 3531 if (temp >= stcb->asoc.streamincnt) { 3532 continue; 3533 } 3534 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3535 } 3536 } else { 3537 list = NULL; 3538 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3539 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3540 } 3541 } 3542 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3543 } 3544 3545 static void 3546 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3547 { 3548 uint32_t i; 3549 uint16_t temp; 3550 3551 if (number_entries > 0) { 3552 for (i = 0; i < number_entries; i++) { 3553 temp = ntohs(list[i]); 3554 if (temp >= stcb->asoc.streamoutcnt) { 3555 /* no such stream */ 3556 continue; 3557 } 3558 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3559 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3560 } 3561 } else { 3562 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3563 stcb->asoc.strmout[i].next_mid_ordered = 0; 3564 stcb->asoc.strmout[i].next_mid_unordered = 0; 3565 } 3566 } 3567 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3568 } 3569 3570 static void 3571 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3572 { 3573 uint32_t i; 3574 uint16_t temp; 3575 3576 if (number_entries > 0) { 3577 for (i = 0; i < number_entries; i++) { 3578 temp = ntohs(list[i]); 3579 if (temp >= stcb->asoc.streamoutcnt) { 3580 /* no such stream */ 3581 continue; 3582 } 3583 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3584 } 3585 } else { 3586 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3587 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3588 } 3589 } 3590 } 3591 3592 3593 struct sctp_stream_reset_request * 3594 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3595 { 3596 struct sctp_association *asoc; 3597 struct sctp_chunkhdr *ch; 3598 struct sctp_stream_reset_request *r; 3599 struct sctp_tmit_chunk *chk; 3600 int len, clen; 3601 3602 asoc = &stcb->asoc; 3603 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3604 asoc->stream_reset_outstanding = 0; 3605 return (NULL); 3606 } 3607 if (stcb->asoc.str_reset == NULL) { 3608 asoc->stream_reset_outstanding = 0; 3609 return (NULL); 3610 } 3611 chk = stcb->asoc.str_reset; 3612 if (chk->data == NULL) { 3613 return (NULL); 3614 } 3615 if (bchk) { 3616 /* he wants a copy of the chk pointer */ 3617 *bchk = chk; 3618 } 3619 clen = chk->send_size; 3620 ch = mtod(chk->data, struct sctp_chunkhdr *); 3621 r = (struct sctp_stream_reset_request *)(ch + 1); 3622 if (ntohl(r->request_seq) == seq) { 3623 /* found it */ 3624 return (r); 3625 } 3626 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3627 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3628 /* move to the next one, there can only be a max of two */ 3629 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3630 if (ntohl(r->request_seq) == seq) { 3631 return (r); 3632 } 3633 } 3634 /* that seq is not here */ 3635 return (NULL); 3636 } 3637 3638 static void 3639 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3640 { 3641 struct sctp_association *asoc; 3642 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3643 3644 if (stcb->asoc.str_reset == NULL) { 3645 return; 3646 } 3647 asoc = &stcb->asoc; 3648 3649 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3650 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3651 TAILQ_REMOVE(&asoc->control_send_queue, 3652 chk, 3653 sctp_next); 3654 if (chk->data) { 3655 sctp_m_freem(chk->data); 3656 chk->data = NULL; 3657 } 3658 asoc->ctrl_queue_cnt--; 3659 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3660 /* sa_ignore NO_NULL_CHK */ 3661 stcb->asoc.str_reset = NULL; 3662 } 3663 3664 3665 static int 3666 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3667 uint32_t seq, uint32_t action, 3668 struct sctp_stream_reset_response *respin) 3669 { 3670 uint16_t type; 3671 int lparam_len; 3672 struct sctp_association *asoc = &stcb->asoc; 3673 struct sctp_tmit_chunk *chk; 3674 struct sctp_stream_reset_request *req_param; 3675 struct sctp_stream_reset_out_request *req_out_param; 3676 struct sctp_stream_reset_in_request *req_in_param; 3677 uint32_t number_entries; 3678 3679 if (asoc->stream_reset_outstanding == 0) { 3680 /* duplicate */ 3681 return (0); 3682 } 3683 if (seq == stcb->asoc.str_reset_seq_out) { 3684 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3685 if (req_param != NULL) { 3686 stcb->asoc.str_reset_seq_out++; 3687 type = ntohs(req_param->ph.param_type); 3688 lparam_len = ntohs(req_param->ph.param_length); 3689 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3690 int no_clear = 0; 3691 3692 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3693 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3694 asoc->stream_reset_out_is_outstanding = 0; 3695 if (asoc->stream_reset_outstanding) 3696 asoc->stream_reset_outstanding--; 3697 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3698 /* do it */ 3699 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3700 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3701 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3702 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3703 /* 3704 * Set it up so we don't stop 3705 * retransmitting 3706 */ 3707 asoc->stream_reset_outstanding++; 3708 stcb->asoc.str_reset_seq_out--; 3709 asoc->stream_reset_out_is_outstanding = 1; 3710 no_clear = 1; 3711 } else { 3712 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3713 } 3714 if (no_clear == 0) { 3715 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3716 } 3717 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3718 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3719 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3720 if (asoc->stream_reset_outstanding) 3721 asoc->stream_reset_outstanding--; 3722 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3723 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3724 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3725 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3726 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3727 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3728 } 3729 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3730 /* Ok we now may have more streams */ 3731 int num_stream; 3732 3733 num_stream = stcb->asoc.strm_pending_add_size; 3734 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3735 /* TSNH */ 3736 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3737 } 3738 stcb->asoc.strm_pending_add_size = 0; 3739 if (asoc->stream_reset_outstanding) 3740 asoc->stream_reset_outstanding--; 3741 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3742 /* Put the new streams into effect */ 3743 int i; 3744 3745 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3746 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3747 } 3748 asoc->streamoutcnt += num_stream; 3749 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3750 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3751 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3752 SCTP_STREAM_CHANGE_DENIED); 3753 } else { 3754 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3755 SCTP_STREAM_CHANGE_FAILED); 3756 } 3757 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3758 if (asoc->stream_reset_outstanding) 3759 asoc->stream_reset_outstanding--; 3760 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3761 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3762 SCTP_STREAM_CHANGE_DENIED); 3763 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3764 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3765 SCTP_STREAM_CHANGE_FAILED); 3766 } 3767 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3768 /** 3769 * a) Adopt the new in tsn. 3770 * b) reset the map 3771 * c) Adopt the new out-tsn 3772 */ 3773 struct sctp_stream_reset_response_tsn *resp; 3774 struct sctp_forward_tsn_chunk fwdtsn; 3775 int abort_flag = 0; 3776 3777 if (respin == NULL) { 3778 /* huh ? */ 3779 return (0); 3780 } 3781 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3782 return (0); 3783 } 3784 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3785 resp = (struct sctp_stream_reset_response_tsn *)respin; 3786 asoc->stream_reset_outstanding--; 3787 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3788 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3789 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3790 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3791 if (abort_flag) { 3792 return (1); 3793 } 3794 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3795 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3796 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3797 } 3798 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3799 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3800 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3801 3802 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3803 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3804 3805 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3806 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3807 3808 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3809 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3810 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3811 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3812 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3813 SCTP_ASSOC_RESET_DENIED); 3814 } else { 3815 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3816 SCTP_ASSOC_RESET_FAILED); 3817 } 3818 } 3819 /* get rid of the request and get the request flags */ 3820 if (asoc->stream_reset_outstanding == 0) { 3821 sctp_clean_up_stream_reset(stcb); 3822 } 3823 } 3824 } 3825 if (asoc->stream_reset_outstanding == 0) { 3826 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3827 } 3828 return (0); 3829 } 3830 3831 static void 3832 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3833 struct sctp_tmit_chunk *chk, 3834 struct sctp_stream_reset_in_request *req, int trunc) 3835 { 3836 uint32_t seq; 3837 int len, i; 3838 int number_entries; 3839 uint16_t temp; 3840 3841 /* 3842 * peer wants me to send a str-reset to him for my outgoing seq's if 3843 * seq_in is right. 3844 */ 3845 struct sctp_association *asoc = &stcb->asoc; 3846 3847 seq = ntohl(req->request_seq); 3848 if (asoc->str_reset_seq_in == seq) { 3849 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3850 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3851 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3852 } else if (trunc) { 3853 /* Can't do it, since they exceeded our buffer size */ 3854 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3855 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3856 len = ntohs(req->ph.param_length); 3857 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3858 if (number_entries) { 3859 for (i = 0; i < number_entries; i++) { 3860 temp = ntohs(req->list_of_streams[i]); 3861 if (temp >= stcb->asoc.streamoutcnt) { 3862 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3863 goto bad_boy; 3864 } 3865 req->list_of_streams[i] = temp; 3866 } 3867 for (i = 0; i < number_entries; i++) { 3868 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3869 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3870 } 3871 } 3872 } else { 3873 /* Its all */ 3874 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3875 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3876 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3877 } 3878 } 3879 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3880 } else { 3881 /* Can't do it, since we have sent one out */ 3882 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3883 } 3884 bad_boy: 3885 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3886 asoc->str_reset_seq_in++; 3887 } else if (asoc->str_reset_seq_in - 1 == seq) { 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 } else if (asoc->str_reset_seq_in - 2 == seq) { 3890 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3891 } else { 3892 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3893 } 3894 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3895 } 3896 3897 static int 3898 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3899 struct sctp_tmit_chunk *chk, 3900 struct sctp_stream_reset_tsn_request *req) 3901 { 3902 /* reset all in and out and update the tsn */ 3903 /* 3904 * A) reset my str-seq's on in and out. B) Select a receive next, 3905 * and set cum-ack to it. Also process this selected number as a 3906 * fwd-tsn as well. C) set in the response my next sending seq. 3907 */ 3908 struct sctp_forward_tsn_chunk fwdtsn; 3909 struct sctp_association *asoc = &stcb->asoc; 3910 int abort_flag = 0; 3911 uint32_t seq; 3912 3913 seq = ntohl(req->request_seq); 3914 if (asoc->str_reset_seq_in == seq) { 3915 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3916 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3917 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3918 } else { 3919 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3920 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3921 fwdtsn.ch.chunk_flags = 0; 3922 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3923 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3924 if (abort_flag) { 3925 return (1); 3926 } 3927 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3928 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3929 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3930 } 3931 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3932 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3933 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3934 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3935 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3936 atomic_add_int(&asoc->sending_seq, 1); 3937 /* save off historical data for retrans */ 3938 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3939 asoc->last_sending_seq[0] = asoc->sending_seq; 3940 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3941 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3942 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3943 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3944 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3945 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3946 } 3947 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3948 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3949 asoc->str_reset_seq_in++; 3950 } else if (asoc->str_reset_seq_in - 1 == seq) { 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 } else if (asoc->str_reset_seq_in - 2 == seq) { 3954 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3955 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3956 } else { 3957 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3958 } 3959 return (0); 3960 } 3961 3962 static void 3963 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3964 struct sctp_tmit_chunk *chk, 3965 struct sctp_stream_reset_out_request *req, int trunc) 3966 { 3967 uint32_t seq, tsn; 3968 int number_entries, len; 3969 struct sctp_association *asoc = &stcb->asoc; 3970 3971 seq = ntohl(req->request_seq); 3972 3973 /* now if its not a duplicate we process it */ 3974 if (asoc->str_reset_seq_in == seq) { 3975 len = ntohs(req->ph.param_length); 3976 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3977 /* 3978 * the sender is resetting, handle the list issue.. we must 3979 * a) verify if we can do the reset, if so no problem b) If 3980 * we can't do the reset we must copy the request. c) queue 3981 * it, and setup the data in processor to trigger it off 3982 * when needed and dequeue all the queued data. 3983 */ 3984 tsn = ntohl(req->send_reset_at_tsn); 3985 3986 /* move the reset action back one */ 3987 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3988 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3989 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3990 } else if (trunc) { 3991 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3992 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3993 /* we can do it now */ 3994 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3995 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3996 } else { 3997 /* 3998 * we must queue it up and thus wait for the TSN's 3999 * to arrive that are at or before tsn 4000 */ 4001 struct sctp_stream_reset_list *liste; 4002 int siz; 4003 4004 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4005 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4006 siz, SCTP_M_STRESET); 4007 if (liste == NULL) { 4008 /* gak out of memory */ 4009 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4010 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4011 return; 4012 } 4013 liste->seq = seq; 4014 liste->tsn = tsn; 4015 liste->number_entries = number_entries; 4016 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4017 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4018 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4019 } 4020 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4021 asoc->str_reset_seq_in++; 4022 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4023 /* 4024 * one seq back, just echo back last action since my 4025 * response was lost. 4026 */ 4027 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4028 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4029 /* 4030 * two seq back, just echo back last action since my 4031 * response was lost. 4032 */ 4033 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4034 } else { 4035 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4036 } 4037 } 4038 4039 static void 4040 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4041 struct sctp_stream_reset_add_strm *str_add) 4042 { 4043 /* 4044 * Peer is requesting to add more streams. If its within our 4045 * max-streams we will allow it. 4046 */ 4047 uint32_t num_stream, i; 4048 uint32_t seq; 4049 struct sctp_association *asoc = &stcb->asoc; 4050 struct sctp_queued_to_read *ctl, *nctl; 4051 4052 /* Get the number. */ 4053 seq = ntohl(str_add->request_seq); 4054 num_stream = ntohs(str_add->number_of_streams); 4055 /* Now what would be the new total? */ 4056 if (asoc->str_reset_seq_in == seq) { 4057 num_stream += stcb->asoc.streamincnt; 4058 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4059 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4060 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4061 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4062 (num_stream > 0xffff)) { 4063 /* We must reject it they ask for to many */ 4064 denied: 4065 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4066 } else { 4067 /* Ok, we can do that :-) */ 4068 struct sctp_stream_in *oldstrm; 4069 4070 /* save off the old */ 4071 oldstrm = stcb->asoc.strmin; 4072 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4073 (num_stream * sizeof(struct sctp_stream_in)), 4074 SCTP_M_STRMI); 4075 if (stcb->asoc.strmin == NULL) { 4076 stcb->asoc.strmin = oldstrm; 4077 goto denied; 4078 } 4079 /* copy off the old data */ 4080 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4081 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4082 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4083 stcb->asoc.strmin[i].sid = i; 4084 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4085 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4086 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4087 /* now anything on those queues? */ 4088 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4089 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4090 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4091 } 4092 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4093 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4094 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4095 } 4096 } 4097 /* Init the new streams */ 4098 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4099 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4100 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4101 stcb->asoc.strmin[i].sid = i; 4102 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4103 stcb->asoc.strmin[i].pd_api_started = 0; 4104 stcb->asoc.strmin[i].delivery_started = 0; 4105 } 4106 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4107 /* update the size */ 4108 stcb->asoc.streamincnt = num_stream; 4109 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4110 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4111 } 4112 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4113 asoc->str_reset_seq_in++; 4114 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4115 /* 4116 * one seq back, just echo back last action since my 4117 * response was lost. 4118 */ 4119 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4120 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4121 /* 4122 * two seq back, just echo back last action since my 4123 * response was lost. 4124 */ 4125 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4126 } else { 4127 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4128 4129 } 4130 } 4131 4132 static void 4133 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4134 struct sctp_stream_reset_add_strm *str_add) 4135 { 4136 /* 4137 * Peer is requesting to add more streams. If its within our 4138 * max-streams we will allow it. 4139 */ 4140 uint16_t num_stream; 4141 uint32_t seq; 4142 struct sctp_association *asoc = &stcb->asoc; 4143 4144 /* Get the number. */ 4145 seq = ntohl(str_add->request_seq); 4146 num_stream = ntohs(str_add->number_of_streams); 4147 /* Now what would be the new total? */ 4148 if (asoc->str_reset_seq_in == seq) { 4149 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4150 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4151 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4152 } else if (stcb->asoc.stream_reset_outstanding) { 4153 /* We must reject it we have something pending */ 4154 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4155 } else { 4156 /* Ok, we can do that :-) */ 4157 int mychk; 4158 4159 mychk = stcb->asoc.streamoutcnt; 4160 mychk += num_stream; 4161 if (mychk < 0x10000) { 4162 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4163 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4164 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4165 } 4166 } else { 4167 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4168 } 4169 } 4170 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4171 asoc->str_reset_seq_in++; 4172 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4173 /* 4174 * one seq back, just echo back last action since my 4175 * response was lost. 4176 */ 4177 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4178 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4179 /* 4180 * two seq back, just echo back last action since my 4181 * response was lost. 4182 */ 4183 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4184 } else { 4185 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4186 } 4187 } 4188 4189 #ifdef __GNUC__ 4190 __attribute__((noinline)) 4191 #endif 4192 static int 4193 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4194 struct sctp_chunkhdr *ch_req) 4195 { 4196 uint16_t remaining_length, param_len, ptype; 4197 struct sctp_paramhdr pstore; 4198 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4199 uint32_t seq = 0; 4200 int num_req = 0; 4201 int trunc = 0; 4202 struct sctp_tmit_chunk *chk; 4203 struct sctp_chunkhdr *ch; 4204 struct sctp_paramhdr *ph; 4205 int ret_code = 0; 4206 int num_param = 0; 4207 4208 /* now it may be a reset or a reset-response */ 4209 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4210 4211 /* setup for adding the response */ 4212 sctp_alloc_a_chunk(stcb, chk); 4213 if (chk == NULL) { 4214 return (ret_code); 4215 } 4216 chk->copy_by_ref = 0; 4217 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4218 chk->rec.chunk_id.can_take_data = 0; 4219 chk->flags = 0; 4220 chk->asoc = &stcb->asoc; 4221 chk->no_fr_allowed = 0; 4222 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4223 chk->book_size_scale = 0; 4224 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4225 if (chk->data == NULL) { 4226 strres_nochunk: 4227 if (chk->data) { 4228 sctp_m_freem(chk->data); 4229 chk->data = NULL; 4230 } 4231 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4232 return (ret_code); 4233 } 4234 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4235 4236 /* setup chunk parameters */ 4237 chk->sent = SCTP_DATAGRAM_UNSENT; 4238 chk->snd_count = 0; 4239 chk->whoTo = NULL; 4240 4241 ch = mtod(chk->data, struct sctp_chunkhdr *); 4242 ch->chunk_type = SCTP_STREAM_RESET; 4243 ch->chunk_flags = 0; 4244 ch->chunk_length = htons(chk->send_size); 4245 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4246 offset += sizeof(struct sctp_chunkhdr); 4247 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4248 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4249 if (ph == NULL) { 4250 /* TSNH */ 4251 break; 4252 } 4253 param_len = ntohs(ph->param_length); 4254 if ((param_len > remaining_length) || 4255 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4256 /* bad parameter length */ 4257 break; 4258 } 4259 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4260 (uint8_t *)&cstore); 4261 if (ph == NULL) { 4262 /* TSNH */ 4263 break; 4264 } 4265 ptype = ntohs(ph->param_type); 4266 num_param++; 4267 if (param_len > sizeof(cstore)) { 4268 trunc = 1; 4269 } else { 4270 trunc = 0; 4271 } 4272 if (num_param > SCTP_MAX_RESET_PARAMS) { 4273 /* hit the max of parameters already sorry.. */ 4274 break; 4275 } 4276 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4277 struct sctp_stream_reset_out_request *req_out; 4278 4279 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4280 break; 4281 } 4282 req_out = (struct sctp_stream_reset_out_request *)ph; 4283 num_req++; 4284 if (stcb->asoc.stream_reset_outstanding) { 4285 seq = ntohl(req_out->response_seq); 4286 if (seq == stcb->asoc.str_reset_seq_out) { 4287 /* implicit ack */ 4288 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4289 } 4290 } 4291 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4292 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4293 struct sctp_stream_reset_add_strm *str_add; 4294 4295 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4296 break; 4297 } 4298 str_add = (struct sctp_stream_reset_add_strm *)ph; 4299 num_req++; 4300 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4301 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4302 struct sctp_stream_reset_add_strm *str_add; 4303 4304 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4305 break; 4306 } 4307 str_add = (struct sctp_stream_reset_add_strm *)ph; 4308 num_req++; 4309 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4310 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4311 struct sctp_stream_reset_in_request *req_in; 4312 4313 num_req++; 4314 req_in = (struct sctp_stream_reset_in_request *)ph; 4315 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4316 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4317 struct sctp_stream_reset_tsn_request *req_tsn; 4318 4319 num_req++; 4320 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4321 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4322 ret_code = 1; 4323 goto strres_nochunk; 4324 } 4325 /* no more */ 4326 break; 4327 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4328 struct sctp_stream_reset_response *resp; 4329 uint32_t result; 4330 4331 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4332 break; 4333 } 4334 resp = (struct sctp_stream_reset_response *)ph; 4335 seq = ntohl(resp->response_seq); 4336 result = ntohl(resp->result); 4337 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4338 ret_code = 1; 4339 goto strres_nochunk; 4340 } 4341 } else { 4342 break; 4343 } 4344 offset += SCTP_SIZE32(param_len); 4345 if (remaining_length >= SCTP_SIZE32(param_len)) { 4346 remaining_length -= SCTP_SIZE32(param_len); 4347 } else { 4348 remaining_length = 0; 4349 } 4350 } 4351 if (num_req == 0) { 4352 /* we have no response free the stuff */ 4353 goto strres_nochunk; 4354 } 4355 /* ok we have a chunk to link in */ 4356 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4357 chk, 4358 sctp_next); 4359 stcb->asoc.ctrl_queue_cnt++; 4360 return (ret_code); 4361 } 4362 4363 /* 4364 * Handle a router or endpoints report of a packet loss, there are two ways 4365 * to handle this, either we get the whole packet and must disect it 4366 * ourselves (possibly with truncation and or corruption) or it is a summary 4367 * from a middle box that did the disectting for us. 4368 */ 4369 static void 4370 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4371 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4372 { 4373 uint32_t bottle_bw, on_queue; 4374 uint16_t trunc_len; 4375 unsigned int chlen; 4376 unsigned int at; 4377 struct sctp_chunk_desc desc; 4378 struct sctp_chunkhdr *ch; 4379 4380 chlen = ntohs(cp->ch.chunk_length); 4381 chlen -= sizeof(struct sctp_pktdrop_chunk); 4382 /* XXX possible chlen underflow */ 4383 if (chlen == 0) { 4384 ch = NULL; 4385 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4386 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4387 } else { 4388 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4389 chlen -= sizeof(struct sctphdr); 4390 /* XXX possible chlen underflow */ 4391 memset(&desc, 0, sizeof(desc)); 4392 } 4393 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4394 if (trunc_len > limit) { 4395 trunc_len = limit; 4396 } 4397 /* now the chunks themselves */ 4398 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4399 desc.chunk_type = ch->chunk_type; 4400 /* get amount we need to move */ 4401 at = ntohs(ch->chunk_length); 4402 if (at < sizeof(struct sctp_chunkhdr)) { 4403 /* corrupt chunk, maybe at the end? */ 4404 SCTP_STAT_INCR(sctps_pdrpcrupt); 4405 break; 4406 } 4407 if (trunc_len == 0) { 4408 /* we are supposed to have all of it */ 4409 if (at > chlen) { 4410 /* corrupt skip it */ 4411 SCTP_STAT_INCR(sctps_pdrpcrupt); 4412 break; 4413 } 4414 } else { 4415 /* is there enough of it left ? */ 4416 if (desc.chunk_type == SCTP_DATA) { 4417 if (chlen < (sizeof(struct sctp_data_chunk) + 4418 sizeof(desc.data_bytes))) { 4419 break; 4420 } 4421 } else { 4422 if (chlen < sizeof(struct sctp_chunkhdr)) { 4423 break; 4424 } 4425 } 4426 } 4427 if (desc.chunk_type == SCTP_DATA) { 4428 /* can we get out the tsn? */ 4429 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4430 SCTP_STAT_INCR(sctps_pdrpmbda); 4431 4432 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4433 /* yep */ 4434 struct sctp_data_chunk *dcp; 4435 uint8_t *ddp; 4436 unsigned int iii; 4437 4438 dcp = (struct sctp_data_chunk *)ch; 4439 ddp = (uint8_t *)(dcp + 1); 4440 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4441 desc.data_bytes[iii] = ddp[iii]; 4442 } 4443 desc.tsn_ifany = dcp->dp.tsn; 4444 } else { 4445 /* nope we are done. */ 4446 SCTP_STAT_INCR(sctps_pdrpnedat); 4447 break; 4448 } 4449 } else { 4450 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4451 SCTP_STAT_INCR(sctps_pdrpmbct); 4452 } 4453 4454 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4455 SCTP_STAT_INCR(sctps_pdrppdbrk); 4456 break; 4457 } 4458 if (SCTP_SIZE32(at) > chlen) { 4459 break; 4460 } 4461 chlen -= SCTP_SIZE32(at); 4462 if (chlen < sizeof(struct sctp_chunkhdr)) { 4463 /* done, none left */ 4464 break; 4465 } 4466 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4467 } 4468 /* Now update any rwnd --- possibly */ 4469 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4470 /* From a peer, we get a rwnd report */ 4471 uint32_t a_rwnd; 4472 4473 SCTP_STAT_INCR(sctps_pdrpfehos); 4474 4475 bottle_bw = ntohl(cp->bottle_bw); 4476 on_queue = ntohl(cp->current_onq); 4477 if (bottle_bw && on_queue) { 4478 /* a rwnd report is in here */ 4479 if (bottle_bw > on_queue) 4480 a_rwnd = bottle_bw - on_queue; 4481 else 4482 a_rwnd = 0; 4483 4484 if (a_rwnd == 0) 4485 stcb->asoc.peers_rwnd = 0; 4486 else { 4487 if (a_rwnd > stcb->asoc.total_flight) { 4488 stcb->asoc.peers_rwnd = 4489 a_rwnd - stcb->asoc.total_flight; 4490 } else { 4491 stcb->asoc.peers_rwnd = 0; 4492 } 4493 if (stcb->asoc.peers_rwnd < 4494 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4495 /* SWS sender side engages */ 4496 stcb->asoc.peers_rwnd = 0; 4497 } 4498 } 4499 } 4500 } else { 4501 SCTP_STAT_INCR(sctps_pdrpfmbox); 4502 } 4503 4504 /* now middle boxes in sat networks get a cwnd bump */ 4505 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4506 (stcb->asoc.sat_t3_loss_recovery == 0) && 4507 (stcb->asoc.sat_network)) { 4508 /* 4509 * This is debatable but for sat networks it makes sense 4510 * Note if a T3 timer has went off, we will prohibit any 4511 * changes to cwnd until we exit the t3 loss recovery. 4512 */ 4513 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4514 net, cp, &bottle_bw, &on_queue); 4515 } 4516 } 4517 4518 /* 4519 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4520 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4521 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4522 * length of the complete packet outputs: - length: modified to remaining 4523 * length after control processing - netp: modified to new sctp_nets after 4524 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4525 * bad packet,...) otherwise return the tcb for this packet 4526 */ 4527 #ifdef __GNUC__ 4528 __attribute__((noinline)) 4529 #endif 4530 static struct sctp_tcb * 4531 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4532 struct sockaddr *src, struct sockaddr *dst, 4533 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4534 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4535 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4536 uint32_t vrf_id, uint16_t port) 4537 { 4538 struct sctp_association *asoc; 4539 struct mbuf *op_err; 4540 char msg[SCTP_DIAG_INFO_LEN]; 4541 uint32_t vtag_in; 4542 int num_chunks = 0; /* number of control chunks processed */ 4543 uint32_t chk_length, contiguous; 4544 int ret; 4545 int abort_no_unlock = 0; 4546 int ecne_seen = 0; 4547 4548 /* 4549 * How big should this be, and should it be alloc'd? Lets try the 4550 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4551 * until we get into jumbo grams and such.. 4552 */ 4553 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4554 int got_auth = 0; 4555 uint32_t auth_offset = 0, auth_len = 0; 4556 int auth_skipped = 0; 4557 int asconf_cnt = 0; 4558 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4559 struct socket *so; 4560 #endif 4561 4562 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4563 iphlen, *offset, length, (void *)stcb); 4564 4565 if (stcb) { 4566 SCTP_TCB_LOCK_ASSERT(stcb); 4567 } 4568 /* validate chunk header length... */ 4569 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4570 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4571 ntohs(ch->chunk_length)); 4572 *offset = length; 4573 return (stcb); 4574 } 4575 /* 4576 * validate the verification tag 4577 */ 4578 vtag_in = ntohl(sh->v_tag); 4579 4580 if (ch->chunk_type == SCTP_INITIATION) { 4581 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4582 ntohs(ch->chunk_length), vtag_in); 4583 if (vtag_in != 0) { 4584 /* protocol error- silently discard... */ 4585 SCTP_STAT_INCR(sctps_badvtag); 4586 if (stcb != NULL) { 4587 SCTP_TCB_UNLOCK(stcb); 4588 } 4589 return (NULL); 4590 } 4591 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4592 /* 4593 * If there is no stcb, skip the AUTH chunk and process 4594 * later after a stcb is found (to validate the lookup was 4595 * valid. 4596 */ 4597 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4598 (stcb == NULL) && 4599 (inp->auth_supported == 1)) { 4600 /* save this chunk for later processing */ 4601 auth_skipped = 1; 4602 auth_offset = *offset; 4603 auth_len = ntohs(ch->chunk_length); 4604 4605 /* (temporarily) move past this chunk */ 4606 *offset += SCTP_SIZE32(auth_len); 4607 if (*offset >= length) { 4608 /* no more data left in the mbuf chain */ 4609 *offset = length; 4610 return (NULL); 4611 } 4612 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4613 sizeof(struct sctp_chunkhdr), chunk_buf); 4614 } 4615 if (ch == NULL) { 4616 /* Help */ 4617 *offset = length; 4618 return (stcb); 4619 } 4620 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4621 goto process_control_chunks; 4622 } 4623 /* 4624 * first check if it's an ASCONF with an unknown src addr we 4625 * need to look inside to find the association 4626 */ 4627 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4628 struct sctp_chunkhdr *asconf_ch = ch; 4629 uint32_t asconf_offset = 0, asconf_len = 0; 4630 4631 /* inp's refcount may be reduced */ 4632 SCTP_INP_INCR_REF(inp); 4633 4634 asconf_offset = *offset; 4635 do { 4636 asconf_len = ntohs(asconf_ch->chunk_length); 4637 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4638 break; 4639 stcb = sctp_findassociation_ep_asconf(m, 4640 *offset, 4641 dst, 4642 sh, &inp, netp, vrf_id); 4643 if (stcb != NULL) 4644 break; 4645 asconf_offset += SCTP_SIZE32(asconf_len); 4646 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4647 sizeof(struct sctp_chunkhdr), chunk_buf); 4648 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4649 if (stcb == NULL) { 4650 /* 4651 * reduce inp's refcount if not reduced in 4652 * sctp_findassociation_ep_asconf(). 4653 */ 4654 SCTP_INP_DECR_REF(inp); 4655 } 4656 /* now go back and verify any auth chunk to be sure */ 4657 if (auth_skipped && (stcb != NULL)) { 4658 struct sctp_auth_chunk *auth; 4659 4660 auth = (struct sctp_auth_chunk *) 4661 sctp_m_getptr(m, auth_offset, 4662 auth_len, chunk_buf); 4663 got_auth = 1; 4664 auth_skipped = 0; 4665 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4666 auth_offset)) { 4667 /* auth HMAC failed so dump it */ 4668 *offset = length; 4669 return (stcb); 4670 } else { 4671 /* remaining chunks are HMAC checked */ 4672 stcb->asoc.authenticated = 1; 4673 } 4674 } 4675 } 4676 if (stcb == NULL) { 4677 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4678 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4679 msg); 4680 /* no association, so it's out of the blue... */ 4681 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4682 mflowtype, mflowid, inp->fibnum, 4683 vrf_id, port); 4684 *offset = length; 4685 return (NULL); 4686 } 4687 asoc = &stcb->asoc; 4688 /* ABORT and SHUTDOWN can use either v_tag... */ 4689 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4690 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4691 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4692 /* Take the T-bit always into account. */ 4693 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4694 (vtag_in == asoc->my_vtag)) || 4695 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4696 (asoc->peer_vtag != htonl(0)) && 4697 (vtag_in == asoc->peer_vtag))) { 4698 /* this is valid */ 4699 } else { 4700 /* drop this packet... */ 4701 SCTP_STAT_INCR(sctps_badvtag); 4702 if (stcb != NULL) { 4703 SCTP_TCB_UNLOCK(stcb); 4704 } 4705 return (NULL); 4706 } 4707 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4708 if (vtag_in != asoc->my_vtag) { 4709 /* 4710 * this could be a stale SHUTDOWN-ACK or the 4711 * peer never got the SHUTDOWN-COMPLETE and 4712 * is still hung; we have started a new asoc 4713 * but it won't complete until the shutdown 4714 * is completed 4715 */ 4716 if (stcb != NULL) { 4717 SCTP_TCB_UNLOCK(stcb); 4718 } 4719 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4720 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4721 msg); 4722 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4723 sh, inp, op_err, 4724 mflowtype, mflowid, fibnum, 4725 vrf_id, port); 4726 return (NULL); 4727 } 4728 } else { 4729 /* for all other chunks, vtag must match */ 4730 if (vtag_in != asoc->my_vtag) { 4731 /* invalid vtag... */ 4732 SCTPDBG(SCTP_DEBUG_INPUT3, 4733 "invalid vtag: %xh, expect %xh\n", 4734 vtag_in, asoc->my_vtag); 4735 SCTP_STAT_INCR(sctps_badvtag); 4736 if (stcb != NULL) { 4737 SCTP_TCB_UNLOCK(stcb); 4738 } 4739 *offset = length; 4740 return (NULL); 4741 } 4742 } 4743 } /* end if !SCTP_COOKIE_ECHO */ 4744 /* 4745 * process all control chunks... 4746 */ 4747 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4748 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4749 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4750 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4751 /* implied cookie-ack.. we must have lost the ack */ 4752 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4753 *netp); 4754 } 4755 process_control_chunks: 4756 while (IS_SCTP_CONTROL(ch)) { 4757 /* validate chunk length */ 4758 chk_length = ntohs(ch->chunk_length); 4759 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4760 ch->chunk_type, chk_length); 4761 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4762 if (chk_length < sizeof(*ch) || 4763 (*offset + (int)chk_length) > length) { 4764 *offset = length; 4765 return (stcb); 4766 } 4767 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4768 /* 4769 * INIT and INIT-ACK only gets the init ack "header" portion 4770 * only because we don't have to process the peer's COOKIE. 4771 * All others get a complete chunk. 4772 */ 4773 switch (ch->chunk_type) { 4774 case SCTP_INITIATION: 4775 contiguous = sizeof(struct sctp_init_chunk); 4776 break; 4777 case SCTP_INITIATION_ACK: 4778 contiguous = sizeof(struct sctp_init_ack_chunk); 4779 break; 4780 default: 4781 contiguous = min(chk_length, sizeof(chunk_buf)); 4782 break; 4783 } 4784 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4785 contiguous, 4786 chunk_buf); 4787 if (ch == NULL) { 4788 *offset = length; 4789 if (stcb != NULL) { 4790 SCTP_TCB_UNLOCK(stcb); 4791 } 4792 return (NULL); 4793 } 4794 num_chunks++; 4795 /* Save off the last place we got a control from */ 4796 if (stcb != NULL) { 4797 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4798 /* 4799 * allow last_control to be NULL if 4800 * ASCONF... ASCONF processing will find the 4801 * right net later 4802 */ 4803 if ((netp != NULL) && (*netp != NULL)) 4804 stcb->asoc.last_control_chunk_from = *netp; 4805 } 4806 } 4807 #ifdef SCTP_AUDITING_ENABLED 4808 sctp_audit_log(0xB0, ch->chunk_type); 4809 #endif 4810 4811 /* check to see if this chunk required auth, but isn't */ 4812 if ((stcb != NULL) && 4813 (stcb->asoc.auth_supported == 1) && 4814 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4815 !stcb->asoc.authenticated) { 4816 /* "silently" ignore */ 4817 SCTP_STAT_INCR(sctps_recvauthmissing); 4818 goto next_chunk; 4819 } 4820 switch (ch->chunk_type) { 4821 case SCTP_INITIATION: 4822 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4823 /* The INIT chunk must be the only chunk. */ 4824 if ((num_chunks > 1) || 4825 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4826 /* RFC 4960 requires that no ABORT is sent */ 4827 *offset = length; 4828 if (stcb != NULL) { 4829 SCTP_TCB_UNLOCK(stcb); 4830 } 4831 return (NULL); 4832 } 4833 /* Honor our resource limit. */ 4834 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4835 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4836 sctp_abort_association(inp, stcb, m, iphlen, 4837 src, dst, sh, op_err, 4838 mflowtype, mflowid, 4839 vrf_id, port); 4840 *offset = length; 4841 return (NULL); 4842 } 4843 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4844 (struct sctp_init_chunk *)ch, inp, 4845 stcb, *netp, &abort_no_unlock, 4846 mflowtype, mflowid, 4847 vrf_id, port); 4848 *offset = length; 4849 if ((!abort_no_unlock) && (stcb != NULL)) { 4850 SCTP_TCB_UNLOCK(stcb); 4851 } 4852 return (NULL); 4853 break; 4854 case SCTP_PAD_CHUNK: 4855 break; 4856 case SCTP_INITIATION_ACK: 4857 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4858 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4859 /* We are not interested anymore */ 4860 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4861 ; 4862 } else { 4863 *offset = length; 4864 if (stcb != NULL) { 4865 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4866 so = SCTP_INP_SO(inp); 4867 atomic_add_int(&stcb->asoc.refcnt, 1); 4868 SCTP_TCB_UNLOCK(stcb); 4869 SCTP_SOCKET_LOCK(so, 1); 4870 SCTP_TCB_LOCK(stcb); 4871 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4872 #endif 4873 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4874 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4876 SCTP_SOCKET_UNLOCK(so, 1); 4877 #endif 4878 } 4879 return (NULL); 4880 } 4881 } 4882 /* The INIT-ACK chunk must be the only chunk. */ 4883 if ((num_chunks > 1) || 4884 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4885 *offset = length; 4886 return (stcb); 4887 } 4888 if ((netp != NULL) && (*netp != NULL)) { 4889 ret = sctp_handle_init_ack(m, iphlen, *offset, 4890 src, dst, sh, 4891 (struct sctp_init_ack_chunk *)ch, 4892 stcb, *netp, 4893 &abort_no_unlock, 4894 mflowtype, mflowid, 4895 vrf_id); 4896 } else { 4897 ret = -1; 4898 } 4899 *offset = length; 4900 if (abort_no_unlock) { 4901 return (NULL); 4902 } 4903 /* 4904 * Special case, I must call the output routine to 4905 * get the cookie echoed 4906 */ 4907 if ((stcb != NULL) && (ret == 0)) { 4908 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4909 } 4910 return (stcb); 4911 break; 4912 case SCTP_SELECTIVE_ACK: 4913 case SCTP_NR_SELECTIVE_ACK: 4914 { 4915 int abort_now = 0; 4916 uint32_t a_rwnd, cum_ack; 4917 uint16_t num_seg, num_nr_seg, num_dup; 4918 uint8_t flags; 4919 int offset_seg, offset_dup; 4920 4921 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4922 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4923 SCTP_STAT_INCR(sctps_recvsacks); 4924 if (stcb == NULL) { 4925 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4926 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4927 break; 4928 } 4929 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4930 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4931 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4932 break; 4933 } 4934 } else { 4935 if (stcb->asoc.nrsack_supported == 0) { 4936 goto unknown_chunk; 4937 } 4938 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4939 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4940 break; 4941 } 4942 } 4943 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4944 /*- 4945 * If we have sent a shutdown-ack, we will pay no 4946 * attention to a sack sent in to us since 4947 * we don't care anymore. 4948 */ 4949 break; 4950 } 4951 flags = ch->chunk_flags; 4952 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4953 struct sctp_sack_chunk *sack; 4954 4955 sack = (struct sctp_sack_chunk *)ch; 4956 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4957 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4958 num_nr_seg = 0; 4959 num_dup = ntohs(sack->sack.num_dup_tsns); 4960 a_rwnd = ntohl(sack->sack.a_rwnd); 4961 if (sizeof(struct sctp_sack_chunk) + 4962 num_seg * sizeof(struct sctp_gap_ack_block) + 4963 num_dup * sizeof(uint32_t) != chk_length) { 4964 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4965 break; 4966 } 4967 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4968 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4969 } else { 4970 struct sctp_nr_sack_chunk *nr_sack; 4971 4972 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4973 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4974 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4975 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4976 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4977 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4978 if (sizeof(struct sctp_nr_sack_chunk) + 4979 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4980 num_dup * sizeof(uint32_t) != chk_length) { 4981 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4982 break; 4983 } 4984 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4985 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4986 } 4987 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4988 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4989 cum_ack, num_seg, a_rwnd); 4990 stcb->asoc.seen_a_sack_this_pkt = 1; 4991 if ((stcb->asoc.pr_sctp_cnt == 0) && 4992 (num_seg == 0) && (num_nr_seg == 0) && 4993 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4994 (stcb->asoc.saw_sack_with_frags == 0) && 4995 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4996 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4997 /* 4998 * We have a SIMPLE sack having no 4999 * prior segments and data on sent 5000 * queue to be acked. Use the faster 5001 * path sack processing. We also 5002 * allow window update sacks with no 5003 * missing segments to go this way 5004 * too. 5005 */ 5006 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5007 &abort_now, ecne_seen); 5008 } else { 5009 if ((netp != NULL) && (*netp != NULL)) { 5010 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5011 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5012 cum_ack, a_rwnd, ecne_seen); 5013 } 5014 } 5015 if (abort_now) { 5016 /* ABORT signal from sack processing */ 5017 *offset = length; 5018 return (NULL); 5019 } 5020 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5021 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5022 (stcb->asoc.stream_queue_cnt == 0)) { 5023 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5024 } 5025 break; 5026 } 5027 case SCTP_HEARTBEAT_REQUEST: 5028 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5029 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5030 SCTP_STAT_INCR(sctps_recvheartbeat); 5031 sctp_send_heartbeat_ack(stcb, m, *offset, 5032 chk_length, *netp); 5033 } 5034 break; 5035 case SCTP_HEARTBEAT_ACK: 5036 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5037 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5038 /* Its not ours */ 5039 *offset = length; 5040 return (stcb); 5041 } 5042 SCTP_STAT_INCR(sctps_recvheartbeatack); 5043 if ((netp != NULL) && (*netp != NULL)) { 5044 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5045 stcb, *netp); 5046 } 5047 break; 5048 case SCTP_ABORT_ASSOCIATION: 5049 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5050 (void *)stcb); 5051 *offset = length; 5052 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5053 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5054 return (NULL); 5055 } else { 5056 return (stcb); 5057 } 5058 } else { 5059 return (NULL); 5060 } 5061 break; 5062 case SCTP_SHUTDOWN: 5063 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5064 (void *)stcb); 5065 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5066 *offset = length; 5067 return (stcb); 5068 } 5069 if ((netp != NULL) && (*netp != NULL)) { 5070 int abort_flag = 0; 5071 5072 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5073 stcb, *netp, &abort_flag); 5074 if (abort_flag) { 5075 *offset = length; 5076 return (NULL); 5077 } 5078 } 5079 break; 5080 case SCTP_SHUTDOWN_ACK: 5081 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5082 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5083 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5084 } 5085 *offset = length; 5086 return (NULL); 5087 break; 5088 case SCTP_OPERATION_ERROR: 5089 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5090 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5091 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5092 *offset = length; 5093 return (NULL); 5094 } 5095 break; 5096 case SCTP_COOKIE_ECHO: 5097 SCTPDBG(SCTP_DEBUG_INPUT3, 5098 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5099 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5100 ; 5101 } else { 5102 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5103 /* We are not interested anymore */ 5104 abend: 5105 if (stcb != NULL) { 5106 SCTP_TCB_UNLOCK(stcb); 5107 } 5108 *offset = length; 5109 return (NULL); 5110 } 5111 } 5112 /*- 5113 * First are we accepting? We do this again here 5114 * since it is possible that a previous endpoint WAS 5115 * listening responded to a INIT-ACK and then 5116 * closed. We opened and bound.. and are now no 5117 * longer listening. 5118 * 5119 * XXXGL: notes on checking listen queue length. 5120 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5121 * SOLISTENING(), because a listening "UDP type" 5122 * socket isn't listening in terms of the socket 5123 * layer. It is a normal data flow socket, that 5124 * can fork off new connections. Thus, we should 5125 * look into sol_qlen only in case we are !UDP. 5126 * 2) Checking sol_qlen in general requires locking 5127 * the socket, and this code lacks that. 5128 */ 5129 if ((stcb == NULL) && 5130 (!SCTP_IS_LISTENING(inp) || 5131 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5132 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5133 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5134 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5135 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5136 sctp_abort_association(inp, stcb, m, iphlen, 5137 src, dst, sh, op_err, 5138 mflowtype, mflowid, 5139 vrf_id, port); 5140 } 5141 *offset = length; 5142 return (NULL); 5143 } else { 5144 struct mbuf *ret_buf; 5145 struct sctp_inpcb *linp; 5146 5147 if (stcb) { 5148 linp = NULL; 5149 } else { 5150 linp = inp; 5151 } 5152 5153 if (linp != NULL) { 5154 SCTP_ASOC_CREATE_LOCK(linp); 5155 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5156 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5157 SCTP_ASOC_CREATE_UNLOCK(linp); 5158 goto abend; 5159 } 5160 } 5161 if (netp != NULL) { 5162 struct sctp_tcb *locked_stcb; 5163 5164 locked_stcb = stcb; 5165 ret_buf = 5166 sctp_handle_cookie_echo(m, iphlen, 5167 *offset, 5168 src, dst, 5169 sh, 5170 (struct sctp_cookie_echo_chunk *)ch, 5171 &inp, &stcb, netp, 5172 auth_skipped, 5173 auth_offset, 5174 auth_len, 5175 &locked_stcb, 5176 mflowtype, 5177 mflowid, 5178 vrf_id, 5179 port); 5180 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5181 SCTP_TCB_UNLOCK(locked_stcb); 5182 } 5183 if (stcb != NULL) { 5184 SCTP_TCB_LOCK_ASSERT(stcb); 5185 } 5186 } else { 5187 ret_buf = NULL; 5188 } 5189 if (linp != NULL) { 5190 SCTP_ASOC_CREATE_UNLOCK(linp); 5191 } 5192 if (ret_buf == NULL) { 5193 if (stcb != NULL) { 5194 SCTP_TCB_UNLOCK(stcb); 5195 } 5196 SCTPDBG(SCTP_DEBUG_INPUT3, 5197 "GAK, null buffer\n"); 5198 *offset = length; 5199 return (NULL); 5200 } 5201 /* if AUTH skipped, see if it verified... */ 5202 if (auth_skipped) { 5203 got_auth = 1; 5204 auth_skipped = 0; 5205 } 5206 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5207 /* 5208 * Restart the timer if we have 5209 * pending data 5210 */ 5211 struct sctp_tmit_chunk *chk; 5212 5213 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5214 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5215 } 5216 } 5217 break; 5218 case SCTP_COOKIE_ACK: 5219 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5220 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5221 return (stcb); 5222 } 5223 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5224 /* We are not interested anymore */ 5225 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5226 ; 5227 } else if (stcb) { 5228 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5229 so = SCTP_INP_SO(inp); 5230 atomic_add_int(&stcb->asoc.refcnt, 1); 5231 SCTP_TCB_UNLOCK(stcb); 5232 SCTP_SOCKET_LOCK(so, 1); 5233 SCTP_TCB_LOCK(stcb); 5234 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5235 #endif 5236 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5237 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5238 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5239 SCTP_SOCKET_UNLOCK(so, 1); 5240 #endif 5241 *offset = length; 5242 return (NULL); 5243 } 5244 } 5245 if ((netp != NULL) && (*netp != NULL)) { 5246 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5247 } 5248 break; 5249 case SCTP_ECN_ECHO: 5250 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5251 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5252 /* Its not ours */ 5253 *offset = length; 5254 return (stcb); 5255 } 5256 if (stcb->asoc.ecn_supported == 0) { 5257 goto unknown_chunk; 5258 } 5259 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5260 ecne_seen = 1; 5261 break; 5262 case SCTP_ECN_CWR: 5263 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5264 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5265 *offset = length; 5266 return (stcb); 5267 } 5268 if (stcb->asoc.ecn_supported == 0) { 5269 goto unknown_chunk; 5270 } 5271 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5272 break; 5273 case SCTP_SHUTDOWN_COMPLETE: 5274 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5275 /* must be first and only chunk */ 5276 if ((num_chunks > 1) || 5277 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5278 *offset = length; 5279 return (stcb); 5280 } 5281 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5282 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5283 stcb, *netp); 5284 } 5285 *offset = length; 5286 return (NULL); 5287 break; 5288 case SCTP_ASCONF: 5289 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5290 if (stcb != NULL) { 5291 if (stcb->asoc.asconf_supported == 0) { 5292 goto unknown_chunk; 5293 } 5294 sctp_handle_asconf(m, *offset, src, 5295 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5296 asconf_cnt++; 5297 } 5298 break; 5299 case SCTP_ASCONF_ACK: 5300 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5301 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5302 /* Its not ours */ 5303 *offset = length; 5304 return (stcb); 5305 } 5306 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5307 if (stcb->asoc.asconf_supported == 0) { 5308 goto unknown_chunk; 5309 } 5310 /* He's alive so give him credit */ 5311 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5312 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5313 stcb->asoc.overall_error_count, 5314 0, 5315 SCTP_FROM_SCTP_INPUT, 5316 __LINE__); 5317 } 5318 stcb->asoc.overall_error_count = 0; 5319 sctp_handle_asconf_ack(m, *offset, 5320 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5321 if (abort_no_unlock) 5322 return (NULL); 5323 } 5324 break; 5325 case SCTP_FORWARD_CUM_TSN: 5326 case SCTP_IFORWARD_CUM_TSN: 5327 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5328 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5329 /* Its not ours */ 5330 *offset = length; 5331 return (stcb); 5332 } 5333 if (stcb != NULL) { 5334 int abort_flag = 0; 5335 5336 if (stcb->asoc.prsctp_supported == 0) { 5337 goto unknown_chunk; 5338 } 5339 *fwd_tsn_seen = 1; 5340 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5341 /* We are not interested anymore */ 5342 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5343 so = SCTP_INP_SO(inp); 5344 atomic_add_int(&stcb->asoc.refcnt, 1); 5345 SCTP_TCB_UNLOCK(stcb); 5346 SCTP_SOCKET_LOCK(so, 1); 5347 SCTP_TCB_LOCK(stcb); 5348 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5349 #endif 5350 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5351 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5352 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5353 SCTP_SOCKET_UNLOCK(so, 1); 5354 #endif 5355 *offset = length; 5356 return (NULL); 5357 } 5358 /* 5359 * For sending a SACK this looks like DATA 5360 * chunks. 5361 */ 5362 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5363 sctp_handle_forward_tsn(stcb, 5364 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5365 if (abort_flag) { 5366 *offset = length; 5367 return (NULL); 5368 } 5369 } 5370 break; 5371 case SCTP_STREAM_RESET: 5372 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5373 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5374 /* Its not ours */ 5375 *offset = length; 5376 return (stcb); 5377 } 5378 if (stcb->asoc.reconfig_supported == 0) { 5379 goto unknown_chunk; 5380 } 5381 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5382 /* stop processing */ 5383 *offset = length; 5384 return (NULL); 5385 } 5386 break; 5387 case SCTP_PACKET_DROPPED: 5388 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5389 /* re-get it all please */ 5390 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5391 /* Its not ours */ 5392 *offset = length; 5393 return (stcb); 5394 } 5395 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5396 if (stcb->asoc.pktdrop_supported == 0) { 5397 goto unknown_chunk; 5398 } 5399 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5400 stcb, *netp, 5401 min(chk_length, contiguous)); 5402 } 5403 break; 5404 case SCTP_AUTHENTICATION: 5405 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5406 if (stcb == NULL) { 5407 /* save the first AUTH for later processing */ 5408 if (auth_skipped == 0) { 5409 auth_offset = *offset; 5410 auth_len = chk_length; 5411 auth_skipped = 1; 5412 } 5413 /* skip this chunk (temporarily) */ 5414 goto next_chunk; 5415 } 5416 if (stcb->asoc.auth_supported == 0) { 5417 goto unknown_chunk; 5418 } 5419 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5420 (chk_length > (sizeof(struct sctp_auth_chunk) + 5421 SCTP_AUTH_DIGEST_LEN_MAX))) { 5422 /* Its not ours */ 5423 *offset = length; 5424 return (stcb); 5425 } 5426 if (got_auth == 1) { 5427 /* skip this chunk... it's already auth'd */ 5428 goto next_chunk; 5429 } 5430 got_auth = 1; 5431 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5432 m, *offset)) { 5433 /* auth HMAC failed so dump the packet */ 5434 *offset = length; 5435 return (stcb); 5436 } else { 5437 /* remaining chunks are HMAC checked */ 5438 stcb->asoc.authenticated = 1; 5439 } 5440 break; 5441 5442 default: 5443 unknown_chunk: 5444 /* it's an unknown chunk! */ 5445 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5446 struct sctp_gen_error_cause *cause; 5447 int len; 5448 5449 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5450 0, M_NOWAIT, 1, MT_DATA); 5451 if (op_err != NULL) { 5452 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5453 cause = mtod(op_err, struct sctp_gen_error_cause *); 5454 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5455 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5456 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5457 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5458 if (SCTP_BUF_NEXT(op_err) != NULL) { 5459 #ifdef SCTP_MBUF_LOGGING 5460 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5461 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5462 } 5463 #endif 5464 sctp_queue_op_err(stcb, op_err); 5465 } else { 5466 sctp_m_freem(op_err); 5467 } 5468 } 5469 } 5470 if ((ch->chunk_type & 0x80) == 0) { 5471 /* discard this packet */ 5472 *offset = length; 5473 return (stcb); 5474 } /* else skip this bad chunk and continue... */ 5475 break; 5476 } /* switch (ch->chunk_type) */ 5477 5478 5479 next_chunk: 5480 /* get the next chunk */ 5481 *offset += SCTP_SIZE32(chk_length); 5482 if (*offset >= length) { 5483 /* no more data left in the mbuf chain */ 5484 break; 5485 } 5486 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5487 sizeof(struct sctp_chunkhdr), chunk_buf); 5488 if (ch == NULL) { 5489 *offset = length; 5490 return (stcb); 5491 } 5492 } /* while */ 5493 5494 if ((asconf_cnt > 0) && (stcb != NULL)) { 5495 sctp_send_asconf_ack(stcb); 5496 } 5497 return (stcb); 5498 } 5499 5500 5501 /* 5502 * common input chunk processing (v4 and v6) 5503 */ 5504 void 5505 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5506 struct sockaddr *src, struct sockaddr *dst, 5507 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5508 #if !defined(SCTP_WITH_NO_CSUM) 5509 uint8_t compute_crc, 5510 #endif 5511 uint8_t ecn_bits, 5512 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5513 uint32_t vrf_id, uint16_t port) 5514 { 5515 uint32_t high_tsn; 5516 int fwd_tsn_seen = 0, data_processed = 0; 5517 struct mbuf *m = *mm, *op_err; 5518 char msg[SCTP_DIAG_INFO_LEN]; 5519 int un_sent; 5520 int cnt_ctrl_ready = 0; 5521 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5522 struct sctp_tcb *stcb = NULL; 5523 struct sctp_nets *net = NULL; 5524 5525 SCTP_STAT_INCR(sctps_recvdatagrams); 5526 #ifdef SCTP_AUDITING_ENABLED 5527 sctp_audit_log(0xE0, 1); 5528 sctp_auditing(0, inp, stcb, net); 5529 #endif 5530 #if !defined(SCTP_WITH_NO_CSUM) 5531 if (compute_crc != 0) { 5532 uint32_t check, calc_check; 5533 5534 check = sh->checksum; 5535 sh->checksum = 0; 5536 calc_check = sctp_calculate_cksum(m, iphlen); 5537 sh->checksum = check; 5538 if (calc_check != check) { 5539 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5540 calc_check, check, (void *)m, length, iphlen); 5541 stcb = sctp_findassociation_addr(m, offset, src, dst, 5542 sh, ch, &inp, &net, vrf_id); 5543 #if defined(INET) || defined(INET6) 5544 if ((ch->chunk_type != SCTP_INITIATION) && 5545 (net != NULL) && (net->port != port)) { 5546 if (net->port == 0) { 5547 /* UDP encapsulation turned on. */ 5548 net->mtu -= sizeof(struct udphdr); 5549 if (stcb->asoc.smallest_mtu > net->mtu) { 5550 sctp_pathmtu_adjustment(stcb, net->mtu); 5551 } 5552 } else if (port == 0) { 5553 /* UDP encapsulation turned off. */ 5554 net->mtu += sizeof(struct udphdr); 5555 /* XXX Update smallest_mtu */ 5556 } 5557 net->port = port; 5558 } 5559 #endif 5560 if (net != NULL) { 5561 net->flowtype = mflowtype; 5562 net->flowid = mflowid; 5563 } 5564 if ((inp != NULL) && (stcb != NULL)) { 5565 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5566 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5567 } else if ((inp != NULL) && (stcb == NULL)) { 5568 inp_decr = inp; 5569 } 5570 SCTP_STAT_INCR(sctps_badsum); 5571 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5572 goto out; 5573 } 5574 } 5575 #endif 5576 /* Destination port of 0 is illegal, based on RFC4960. */ 5577 if (sh->dest_port == 0) { 5578 SCTP_STAT_INCR(sctps_hdrops); 5579 goto out; 5580 } 5581 stcb = sctp_findassociation_addr(m, offset, src, dst, 5582 sh, ch, &inp, &net, vrf_id); 5583 #if defined(INET) || defined(INET6) 5584 if ((ch->chunk_type != SCTP_INITIATION) && 5585 (net != NULL) && (net->port != port)) { 5586 if (net->port == 0) { 5587 /* UDP encapsulation turned on. */ 5588 net->mtu -= sizeof(struct udphdr); 5589 if (stcb->asoc.smallest_mtu > net->mtu) { 5590 sctp_pathmtu_adjustment(stcb, net->mtu); 5591 } 5592 } else if (port == 0) { 5593 /* UDP encapsulation turned off. */ 5594 net->mtu += sizeof(struct udphdr); 5595 /* XXX Update smallest_mtu */ 5596 } 5597 net->port = port; 5598 } 5599 #endif 5600 if (net != NULL) { 5601 net->flowtype = mflowtype; 5602 net->flowid = mflowid; 5603 } 5604 if (inp == NULL) { 5605 SCTP_STAT_INCR(sctps_noport); 5606 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5607 goto out; 5608 } 5609 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5610 sctp_send_shutdown_complete2(src, dst, sh, 5611 mflowtype, mflowid, fibnum, 5612 vrf_id, port); 5613 goto out; 5614 } 5615 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5616 goto out; 5617 } 5618 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5619 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5620 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5621 (ch->chunk_type != SCTP_INIT))) { 5622 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5623 "Out of the blue"); 5624 sctp_send_abort(m, iphlen, src, dst, 5625 sh, 0, op_err, 5626 mflowtype, mflowid, fibnum, 5627 vrf_id, port); 5628 } 5629 } 5630 goto out; 5631 } else if (stcb == NULL) { 5632 inp_decr = inp; 5633 } 5634 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5635 (void *)m, iphlen, offset, length, (void *)stcb); 5636 if (stcb) { 5637 /* always clear this before beginning a packet */ 5638 stcb->asoc.authenticated = 0; 5639 stcb->asoc.seen_a_sack_this_pkt = 0; 5640 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5641 (void *)stcb, stcb->asoc.state); 5642 5643 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5644 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5645 /*- 5646 * If we hit here, we had a ref count 5647 * up when the assoc was aborted and the 5648 * timer is clearing out the assoc, we should 5649 * NOT respond to any packet.. its OOTB. 5650 */ 5651 SCTP_TCB_UNLOCK(stcb); 5652 stcb = NULL; 5653 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5654 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5655 msg); 5656 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5657 mflowtype, mflowid, inp->fibnum, 5658 vrf_id, port); 5659 goto out; 5660 } 5661 } 5662 if (IS_SCTP_CONTROL(ch)) { 5663 /* process the control portion of the SCTP packet */ 5664 /* sa_ignore NO_NULL_CHK */ 5665 stcb = sctp_process_control(m, iphlen, &offset, length, 5666 src, dst, sh, ch, 5667 inp, stcb, &net, &fwd_tsn_seen, 5668 mflowtype, mflowid, fibnum, 5669 vrf_id, port); 5670 if (stcb) { 5671 /* 5672 * This covers us if the cookie-echo was there and 5673 * it changes our INP. 5674 */ 5675 inp = stcb->sctp_ep; 5676 #if defined(INET) || defined(INET6) 5677 if ((ch->chunk_type != SCTP_INITIATION) && 5678 (net != NULL) && (net->port != port)) { 5679 if (net->port == 0) { 5680 /* UDP encapsulation turned on. */ 5681 net->mtu -= sizeof(struct udphdr); 5682 if (stcb->asoc.smallest_mtu > net->mtu) { 5683 sctp_pathmtu_adjustment(stcb, net->mtu); 5684 } 5685 } else if (port == 0) { 5686 /* UDP encapsulation turned off. */ 5687 net->mtu += sizeof(struct udphdr); 5688 /* XXX Update smallest_mtu */ 5689 } 5690 net->port = port; 5691 } 5692 #endif 5693 } 5694 } else { 5695 /* 5696 * no control chunks, so pre-process DATA chunks (these 5697 * checks are taken care of by control processing) 5698 */ 5699 5700 /* 5701 * if DATA only packet, and auth is required, then punt... 5702 * can't have authenticated without any AUTH (control) 5703 * chunks 5704 */ 5705 if ((stcb != NULL) && 5706 (stcb->asoc.auth_supported == 1) && 5707 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5708 /* "silently" ignore */ 5709 SCTP_STAT_INCR(sctps_recvauthmissing); 5710 goto out; 5711 } 5712 if (stcb == NULL) { 5713 /* out of the blue DATA chunk */ 5714 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5715 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5716 msg); 5717 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5718 mflowtype, mflowid, fibnum, 5719 vrf_id, port); 5720 goto out; 5721 } 5722 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5723 /* v_tag mismatch! */ 5724 SCTP_STAT_INCR(sctps_badvtag); 5725 goto out; 5726 } 5727 } 5728 5729 if (stcb == NULL) { 5730 /* 5731 * no valid TCB for this packet, or we found it's a bad 5732 * packet while processing control, or we're done with this 5733 * packet (done or skip rest of data), so we drop it... 5734 */ 5735 goto out; 5736 } 5737 /* 5738 * DATA chunk processing 5739 */ 5740 /* plow through the data chunks while length > offset */ 5741 5742 /* 5743 * Rest should be DATA only. Check authentication state if AUTH for 5744 * DATA is required. 5745 */ 5746 if ((length > offset) && 5747 (stcb != NULL) && 5748 (stcb->asoc.auth_supported == 1) && 5749 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5750 !stcb->asoc.authenticated) { 5751 /* "silently" ignore */ 5752 SCTP_STAT_INCR(sctps_recvauthmissing); 5753 SCTPDBG(SCTP_DEBUG_AUTH1, 5754 "Data chunk requires AUTH, skipped\n"); 5755 goto trigger_send; 5756 } 5757 if (length > offset) { 5758 int retval; 5759 5760 /* 5761 * First check to make sure our state is correct. We would 5762 * not get here unless we really did have a tag, so we don't 5763 * abort if this happens, just dump the chunk silently. 5764 */ 5765 switch (SCTP_GET_STATE(&stcb->asoc)) { 5766 case SCTP_STATE_COOKIE_ECHOED: 5767 /* 5768 * we consider data with valid tags in this state 5769 * shows us the cookie-ack was lost. Imply it was 5770 * there. 5771 */ 5772 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5773 break; 5774 case SCTP_STATE_COOKIE_WAIT: 5775 /* 5776 * We consider OOTB any data sent during asoc setup. 5777 */ 5778 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5779 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5780 msg); 5781 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5782 mflowtype, mflowid, inp->fibnum, 5783 vrf_id, port); 5784 goto out; 5785 /* sa_ignore NOTREACHED */ 5786 break; 5787 case SCTP_STATE_EMPTY: /* should not happen */ 5788 case SCTP_STATE_INUSE: /* should not happen */ 5789 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5790 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5791 default: 5792 goto out; 5793 /* sa_ignore NOTREACHED */ 5794 break; 5795 case SCTP_STATE_OPEN: 5796 case SCTP_STATE_SHUTDOWN_SENT: 5797 break; 5798 } 5799 /* plow through the data chunks while length > offset */ 5800 retval = sctp_process_data(mm, iphlen, &offset, length, 5801 inp, stcb, net, &high_tsn); 5802 if (retval == 2) { 5803 /* 5804 * The association aborted, NO UNLOCK needed since 5805 * the association is destroyed. 5806 */ 5807 stcb = NULL; 5808 goto out; 5809 } 5810 data_processed = 1; 5811 /* 5812 * Anything important needs to have been m_copy'ed in 5813 * process_data 5814 */ 5815 } 5816 /* take care of ecn */ 5817 if ((data_processed == 1) && 5818 (stcb->asoc.ecn_supported == 1) && 5819 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5820 /* Yep, we need to add a ECNE */ 5821 sctp_send_ecn_echo(stcb, net, high_tsn); 5822 } 5823 if ((data_processed == 0) && (fwd_tsn_seen)) { 5824 int was_a_gap; 5825 uint32_t highest_tsn; 5826 5827 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5828 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5829 } else { 5830 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5831 } 5832 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5833 stcb->asoc.send_sack = 1; 5834 sctp_sack_check(stcb, was_a_gap); 5835 } else if (fwd_tsn_seen) { 5836 stcb->asoc.send_sack = 1; 5837 } 5838 /* trigger send of any chunks in queue... */ 5839 trigger_send: 5840 #ifdef SCTP_AUDITING_ENABLED 5841 sctp_audit_log(0xE0, 2); 5842 sctp_auditing(1, inp, stcb, net); 5843 #endif 5844 SCTPDBG(SCTP_DEBUG_INPUT1, 5845 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5846 stcb->asoc.peers_rwnd, 5847 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5848 stcb->asoc.total_flight); 5849 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5850 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5851 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5852 } 5853 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5854 cnt_ctrl_ready || 5855 stcb->asoc.trigger_reset || 5856 ((un_sent) && 5857 (stcb->asoc.peers_rwnd > 0 || 5858 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5859 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5860 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5861 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5862 } 5863 #ifdef SCTP_AUDITING_ENABLED 5864 sctp_audit_log(0xE0, 3); 5865 sctp_auditing(2, inp, stcb, net); 5866 #endif 5867 out: 5868 if (stcb != NULL) { 5869 SCTP_TCB_UNLOCK(stcb); 5870 } 5871 if (inp_decr != NULL) { 5872 /* reduce ref-count */ 5873 SCTP_INP_WLOCK(inp_decr); 5874 SCTP_INP_DECR_REF(inp_decr); 5875 SCTP_INP_WUNLOCK(inp_decr); 5876 } 5877 return; 5878 } 5879 5880 #ifdef INET 5881 void 5882 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5883 { 5884 struct mbuf *m; 5885 int iphlen; 5886 uint32_t vrf_id = 0; 5887 uint8_t ecn_bits; 5888 struct sockaddr_in src, dst; 5889 struct ip *ip; 5890 struct sctphdr *sh; 5891 struct sctp_chunkhdr *ch; 5892 int length, offset; 5893 #if !defined(SCTP_WITH_NO_CSUM) 5894 uint8_t compute_crc; 5895 #endif 5896 uint32_t mflowid; 5897 uint8_t mflowtype; 5898 uint16_t fibnum; 5899 5900 iphlen = off; 5901 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5902 SCTP_RELEASE_PKT(i_pak); 5903 return; 5904 } 5905 m = SCTP_HEADER_TO_CHAIN(i_pak); 5906 #ifdef SCTP_MBUF_LOGGING 5907 /* Log in any input mbufs */ 5908 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5909 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5910 } 5911 #endif 5912 #ifdef SCTP_PACKET_LOGGING 5913 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5914 sctp_packet_log(m); 5915 } 5916 #endif 5917 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5918 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5919 m->m_pkthdr.len, 5920 if_name(m->m_pkthdr.rcvif), 5921 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5922 mflowid = m->m_pkthdr.flowid; 5923 mflowtype = M_HASHTYPE_GET(m); 5924 fibnum = M_GETFIB(m); 5925 SCTP_STAT_INCR(sctps_recvpackets); 5926 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5927 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5928 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5929 if (SCTP_BUF_LEN(m) < offset) { 5930 if ((m = m_pullup(m, offset)) == NULL) { 5931 SCTP_STAT_INCR(sctps_hdrops); 5932 return; 5933 } 5934 } 5935 ip = mtod(m, struct ip *); 5936 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5937 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5938 offset -= sizeof(struct sctp_chunkhdr); 5939 memset(&src, 0, sizeof(struct sockaddr_in)); 5940 src.sin_family = AF_INET; 5941 src.sin_len = sizeof(struct sockaddr_in); 5942 src.sin_port = sh->src_port; 5943 src.sin_addr = ip->ip_src; 5944 memset(&dst, 0, sizeof(struct sockaddr_in)); 5945 dst.sin_family = AF_INET; 5946 dst.sin_len = sizeof(struct sockaddr_in); 5947 dst.sin_port = sh->dest_port; 5948 dst.sin_addr = ip->ip_dst; 5949 length = ntohs(ip->ip_len); 5950 /* Validate mbuf chain length with IP payload length. */ 5951 if (SCTP_HEADER_LEN(m) != length) { 5952 SCTPDBG(SCTP_DEBUG_INPUT1, 5953 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5954 SCTP_STAT_INCR(sctps_hdrops); 5955 goto out; 5956 } 5957 /* SCTP does not allow broadcasts or multicasts */ 5958 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5959 goto out; 5960 } 5961 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5962 goto out; 5963 } 5964 ecn_bits = ip->ip_tos; 5965 #if defined(SCTP_WITH_NO_CSUM) 5966 SCTP_STAT_INCR(sctps_recvnocrc); 5967 #else 5968 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5969 SCTP_STAT_INCR(sctps_recvhwcrc); 5970 compute_crc = 0; 5971 } else { 5972 SCTP_STAT_INCR(sctps_recvswcrc); 5973 compute_crc = 1; 5974 } 5975 #endif 5976 sctp_common_input_processing(&m, iphlen, offset, length, 5977 (struct sockaddr *)&src, 5978 (struct sockaddr *)&dst, 5979 sh, ch, 5980 #if !defined(SCTP_WITH_NO_CSUM) 5981 compute_crc, 5982 #endif 5983 ecn_bits, 5984 mflowtype, mflowid, fibnum, 5985 vrf_id, port); 5986 out: 5987 if (m) { 5988 sctp_m_freem(m); 5989 } 5990 return; 5991 } 5992 5993 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5994 extern int *sctp_cpuarry; 5995 #endif 5996 5997 int 5998 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5999 { 6000 struct mbuf *m; 6001 int off; 6002 6003 m = *mp; 6004 off = *offp; 6005 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6006 if (mp_ncpus > 1) { 6007 struct ip *ip; 6008 struct sctphdr *sh; 6009 int offset; 6010 int cpu_to_use; 6011 uint32_t flowid, tag; 6012 6013 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6014 flowid = m->m_pkthdr.flowid; 6015 } else { 6016 /* 6017 * No flow id built by lower layers fix it so we 6018 * create one. 6019 */ 6020 offset = off + sizeof(struct sctphdr); 6021 if (SCTP_BUF_LEN(m) < offset) { 6022 if ((m = m_pullup(m, offset)) == NULL) { 6023 SCTP_STAT_INCR(sctps_hdrops); 6024 return (IPPROTO_DONE); 6025 } 6026 } 6027 ip = mtod(m, struct ip *); 6028 sh = (struct sctphdr *)((caddr_t)ip + off); 6029 tag = htonl(sh->v_tag); 6030 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6031 m->m_pkthdr.flowid = flowid; 6032 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6033 } 6034 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6035 sctp_queue_to_mcore(m, off, cpu_to_use); 6036 return (IPPROTO_DONE); 6037 } 6038 #endif 6039 sctp_input_with_port(m, off, 0); 6040 return (IPPROTO_DONE); 6041 } 6042 #endif 6043