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