1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #if defined(INET) || defined(INET6) 53 #include <netinet/udp.h> 54 #endif 55 #include <netinet/in_kdtrace.h> 56 #include <sys/smp.h> 57 58 59 60 static void 61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 62 { 63 struct sctp_nets *net; 64 65 /* 66 * This now not only stops all cookie timers it also stops any INIT 67 * timers as well. This will make sure that the timers are stopped 68 * in all collision cases. 69 */ 70 SCTP_TCB_LOCK_ASSERT(stcb); 71 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 72 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 77 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 78 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 79 stcb->sctp_ep, 80 stcb, 81 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 82 } 83 } 84 } 85 86 /* INIT handler */ 87 static void 88 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 89 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 90 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 91 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 92 uint8_t mflowtype, uint32_t mflowid, 93 uint32_t vrf_id, uint16_t port) 94 { 95 struct sctp_init *init; 96 struct mbuf *op_err; 97 98 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 99 (void *)stcb); 100 if (stcb == NULL) { 101 SCTP_INP_RLOCK(inp); 102 } 103 /* validate length */ 104 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 105 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 106 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 107 mflowtype, mflowid, 108 vrf_id, port); 109 if (stcb) 110 *abort_no_unlock = 1; 111 goto outnow; 112 } 113 /* validate parameters */ 114 init = &cp->init; 115 if (init->initiate_tag == 0) { 116 /* protocol error... send abort */ 117 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 118 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 119 mflowtype, mflowid, 120 vrf_id, port); 121 if (stcb) 122 *abort_no_unlock = 1; 123 goto outnow; 124 } 125 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 126 /* invalid parameter... send abort */ 127 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 128 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 129 mflowtype, mflowid, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_inbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 138 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 139 mflowtype, mflowid, 140 vrf_id, port); 141 if (stcb) 142 *abort_no_unlock = 1; 143 goto outnow; 144 } 145 if (init->num_outbound_streams == 0) { 146 /* protocol error... send abort */ 147 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 148 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 149 mflowtype, mflowid, 150 vrf_id, port); 151 if (stcb) 152 *abort_no_unlock = 1; 153 goto outnow; 154 } 155 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 156 offset + ntohs(cp->ch.chunk_length))) { 157 /* auth parameter(s) error... send abort */ 158 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 159 "Problem with AUTH parameters"); 160 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 161 mflowtype, mflowid, 162 vrf_id, port); 163 if (stcb) 164 *abort_no_unlock = 1; 165 goto outnow; 166 } 167 /* We are only accepting if we have a listening socket. */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (!SCTP_IS_LISTENING(inp)))) { 172 /* 173 * FIX ME ?? What about TCP model and we have a 174 * match/restart case? Actually no fix is needed. the lookup 175 * will always find the existing assoc so stcb would not be 176 * NULL. It may be questionable to do this since we COULD 177 * just send back the INIT-ACK and hope that the app did 178 * accept()'s by the time the COOKIE was sent. But there is 179 * a price to pay for COOKIE generation and I don't want to 180 * pay it on the chance that the app will actually do some 181 * accepts(). The App just looses and should NOT be in this 182 * state :-) 183 */ 184 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 185 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 186 "No listener"); 187 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 188 mflowtype, mflowid, inp->fibnum, 189 vrf_id, port); 190 } 191 goto outnow; 192 } 193 if ((stcb != NULL) && 194 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 195 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 196 sctp_send_shutdown_ack(stcb, NULL); 197 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 198 } else { 199 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 200 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 201 src, dst, sh, cp, 202 mflowtype, mflowid, 203 vrf_id, port); 204 } 205 outnow: 206 if (stcb == NULL) { 207 SCTP_INP_RUNLOCK(inp); 208 } 209 } 210 211 /* 212 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 213 */ 214 215 int 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 218 SCTP_UNUSED 219 #endif 220 ) 221 { 222 int unsent_data; 223 unsigned int i; 224 struct sctp_stream_queue_pending *sp; 225 struct sctp_association *asoc; 226 227 /* 228 * This function returns if any stream has true unsent data on it. 229 * Note that as it looks through it will clean up any places that 230 * have old data that has been sent but left at top of stream queue. 231 */ 232 asoc = &stcb->asoc; 233 unsent_data = 0; 234 SCTP_TCB_SEND_LOCK(stcb); 235 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 236 /* Check to see if some data queued */ 237 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 238 /* sa_ignore FREED_MEMORY */ 239 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 240 if (sp == NULL) { 241 continue; 242 } 243 if ((sp->msg_is_complete) && 244 (sp->length == 0) && 245 (sp->sender_all_done)) { 246 /* 247 * We are doing differed cleanup. Last time 248 * through when we took all the data the 249 * sender_all_done was not set. 250 */ 251 if (sp->put_last_out == 0) { 252 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 253 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 254 sp->sender_all_done, 255 sp->length, 256 sp->msg_is_complete, 257 sp->put_last_out); 258 } 259 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 260 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 261 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 262 if (sp->net) { 263 sctp_free_remote_addr(sp->net); 264 sp->net = NULL; 265 } 266 if (sp->data) { 267 sctp_m_freem(sp->data); 268 sp->data = NULL; 269 } 270 sctp_free_a_strmoq(stcb, sp, so_locked); 271 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 272 unsent_data++; 273 } 274 } else { 275 unsent_data++; 276 } 277 if (unsent_data > 0) { 278 break; 279 } 280 } 281 } 282 SCTP_TCB_SEND_UNLOCK(stcb); 283 return (unsent_data); 284 } 285 286 static int 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 288 { 289 struct sctp_init *init; 290 struct sctp_association *asoc; 291 struct sctp_nets *lnet; 292 unsigned int i; 293 294 init = &cp->init; 295 asoc = &stcb->asoc; 296 /* save off parameters */ 297 asoc->peer_vtag = ntohl(init->initiate_tag); 298 asoc->peers_rwnd = ntohl(init->a_rwnd); 299 /* init tsn's */ 300 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 301 302 if (!TAILQ_EMPTY(&asoc->nets)) { 303 /* update any ssthresh's that may have a default */ 304 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 305 lnet->ssthresh = asoc->peers_rwnd; 306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 307 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 308 } 309 310 } 311 } 312 SCTP_TCB_SEND_LOCK(stcb); 313 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 314 unsigned int newcnt; 315 struct sctp_stream_out *outs; 316 struct sctp_stream_queue_pending *sp, *nsp; 317 struct sctp_tmit_chunk *chk, *nchk; 318 319 /* abandon the upper streams */ 320 newcnt = ntohs(init->num_inbound_streams); 321 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 322 if (chk->rec.data.sid >= newcnt) { 323 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 324 asoc->send_queue_cnt--; 325 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 326 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 327 #ifdef INVARIANTS 328 } else { 329 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 330 #endif 331 } 332 if (chk->data != NULL) { 333 sctp_free_bufspace(stcb, asoc, chk, 1); 334 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 335 0, chk, SCTP_SO_NOT_LOCKED); 336 if (chk->data) { 337 sctp_m_freem(chk->data); 338 chk->data = NULL; 339 } 340 } 341 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 342 /* sa_ignore FREED_MEMORY */ 343 } 344 } 345 if (asoc->strmout) { 346 for (i = newcnt; i < asoc->pre_open_streams; i++) { 347 outs = &asoc->strmout[i]; 348 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 349 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 350 TAILQ_REMOVE(&outs->outqueue, sp, next); 351 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 352 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 353 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 354 if (sp->data) { 355 sctp_m_freem(sp->data); 356 sp->data = NULL; 357 } 358 if (sp->net) { 359 sctp_free_remote_addr(sp->net); 360 sp->net = NULL; 361 } 362 /* Free the chunk */ 363 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 364 /* sa_ignore FREED_MEMORY */ 365 } 366 outs->state = SCTP_STREAM_CLOSED; 367 } 368 } 369 /* cut back the count */ 370 asoc->pre_open_streams = newcnt; 371 } 372 SCTP_TCB_SEND_UNLOCK(stcb); 373 asoc->streamoutcnt = asoc->pre_open_streams; 374 if (asoc->strmout) { 375 for (i = 0; i < asoc->streamoutcnt; i++) { 376 asoc->strmout[i].state = SCTP_STREAM_OPEN; 377 } 378 } 379 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 380 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 381 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 382 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 383 } 384 /* This is the next one we expect */ 385 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 386 387 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 388 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 389 390 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 391 /* open the requested streams */ 392 393 if (asoc->strmin != NULL) { 394 /* Free the old ones */ 395 for (i = 0; i < asoc->streamincnt; i++) { 396 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 397 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].sid = i; 415 asoc->strmin[i].last_mid_delivered = 0xffffffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 418 asoc->strmin[i].pd_api_started = 0; 419 asoc->strmin[i].delivery_started = 0; 420 } 421 /* 422 * load_address_from_init will put the addresses into the 423 * association when the COOKIE is processed or the INIT-ACK is 424 * processed. Both types of COOKIE's existing and new call this 425 * routine. It will remove addresses that are no longer in the 426 * association (for the restarting case where addresses are 427 * removed). Up front when the INIT arrives we will discard it if it 428 * is a restart and new addresses have been added. 429 */ 430 /* sa_ignore MEMLEAK */ 431 return (0); 432 } 433 434 /* 435 * INIT-ACK message processing/consumption returns value < 0 on error 436 */ 437 static int 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 439 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 440 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 441 struct sctp_nets *net, int *abort_no_unlock, 442 uint8_t mflowtype, uint32_t mflowid, 443 uint32_t vrf_id) 444 { 445 struct sctp_association *asoc; 446 struct mbuf *op_err; 447 int retval, abort_flag, cookie_found; 448 int initack_limit; 449 int nat_friendly = 0; 450 451 /* First verify that we have no illegal param's */ 452 abort_flag = 0; 453 cookie_found = 0; 454 455 op_err = sctp_arethere_unrecognized_parameters(m, 456 (offset + sizeof(struct sctp_init_chunk)), 457 &abort_flag, (struct sctp_chunkhdr *)cp, 458 &nat_friendly, &cookie_found); 459 if (abort_flag) { 460 /* Send an abort and notify peer */ 461 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 462 *abort_no_unlock = 1; 463 return (-1); 464 } 465 if (!cookie_found) { 466 uint16_t len; 467 468 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 469 /* We abort with an error of missing mandatory param */ 470 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 471 if (op_err != NULL) { 472 struct sctp_error_missing_param *cause; 473 474 SCTP_BUF_LEN(op_err) = len; 475 cause = mtod(op_err, struct sctp_error_missing_param *); 476 /* Subtract the reserved param */ 477 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 478 cause->cause.length = htons(len); 479 cause->num_missing_params = htonl(1); 480 cause->type[0] = htons(SCTP_STATE_COOKIE); 481 } 482 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 483 src, dst, sh, op_err, 484 mflowtype, mflowid, 485 vrf_id, net->port); 486 *abort_no_unlock = 1; 487 return (-3); 488 } 489 asoc = &stcb->asoc; 490 asoc->peer_supports_nat = (uint8_t)nat_friendly; 491 /* process the peer's parameters in the INIT-ACK */ 492 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 493 if (retval < 0) { 494 return (retval); 495 } 496 initack_limit = offset + ntohs(cp->ch.chunk_length); 497 /* load all addresses */ 498 if ((retval = sctp_load_addresses_from_init(stcb, m, 499 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 500 src, dst, NULL, stcb->asoc.port))) { 501 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 502 "Problem with address parameters"); 503 SCTPDBG(SCTP_DEBUG_INPUT1, 504 "Load addresses from INIT causes an abort %d\n", 505 retval); 506 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 507 src, dst, sh, op_err, 508 mflowtype, mflowid, 509 vrf_id, net->port); 510 *abort_no_unlock = 1; 511 return (-1); 512 } 513 /* if the peer doesn't support asconf, flush the asconf queue */ 514 if (asoc->asconf_supported == 0) { 515 struct sctp_asconf_addr *param, *nparam; 516 517 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 518 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 519 SCTP_FREE(param, SCTP_M_ASC_ADDR); 520 } 521 } 522 523 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 524 stcb->asoc.local_hmacs); 525 if (op_err) { 526 sctp_queue_op_err(stcb, op_err); 527 /* queuing will steal away the mbuf chain to the out queue */ 528 op_err = NULL; 529 } 530 /* extract the cookie and queue it to "echo" it back... */ 531 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 532 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 533 stcb->asoc.overall_error_count, 534 0, 535 SCTP_FROM_SCTP_INPUT, 536 __LINE__); 537 } 538 stcb->asoc.overall_error_count = 0; 539 net->error_count = 0; 540 541 /* 542 * Cancel the INIT timer, We do this first before queueing the 543 * cookie. We always cancel at the primary to assue that we are 544 * canceling the timer started by the INIT which always goes to the 545 * primary. 546 */ 547 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 548 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 549 550 /* calculate the RTO */ 551 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 552 SCTP_RTT_FROM_NON_DATA); 553 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 554 return (retval); 555 } 556 557 static void 558 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 559 struct sctp_tcb *stcb, struct sctp_nets *net) 560 { 561 union sctp_sockstore store; 562 struct sctp_nets *r_net, *f_net; 563 struct timeval tv; 564 int req_prim = 0; 565 uint16_t old_error_counter; 566 567 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 568 /* Invalid length */ 569 return; 570 } 571 572 memset(&store, 0, sizeof(store)); 573 switch (cp->heartbeat.hb_info.addr_family) { 574 #ifdef INET 575 case AF_INET: 576 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 577 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 578 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 579 store.sin.sin_port = stcb->rport; 580 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 581 sizeof(store.sin.sin_addr)); 582 } else { 583 return; 584 } 585 break; 586 #endif 587 #ifdef INET6 588 case AF_INET6: 589 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 590 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 591 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 592 store.sin6.sin6_port = stcb->rport; 593 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 594 } else { 595 return; 596 } 597 break; 598 #endif 599 default: 600 return; 601 } 602 r_net = sctp_findnet(stcb, &store.sa); 603 if (r_net == NULL) { 604 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 605 return; 606 } 607 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 608 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 609 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 610 /* 611 * If the its a HB and it's random value is correct when can 612 * confirm the destination. 613 */ 614 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 615 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 616 stcb->asoc.primary_destination = r_net; 617 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 618 f_net = TAILQ_FIRST(&stcb->asoc.nets); 619 if (f_net != r_net) { 620 /* 621 * first one on the list is NOT the primary 622 * sctp_cmpaddr() is much more efficient if 623 * the primary is the first on the list, 624 * make it so. 625 */ 626 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 627 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 628 } 629 req_prim = 1; 630 } 631 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 632 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 633 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 634 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 635 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 636 } 637 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 638 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 639 stcb->asoc.overall_error_count, 640 0, 641 SCTP_FROM_SCTP_INPUT, 642 __LINE__); 643 } 644 stcb->asoc.overall_error_count = 0; 645 old_error_counter = r_net->error_count; 646 r_net->error_count = 0; 647 r_net->hb_responded = 1; 648 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 649 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 650 /* Now lets do a RTO with this */ 651 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 652 SCTP_RTT_FROM_NON_DATA); 653 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 654 r_net->dest_state |= SCTP_ADDR_REACHABLE; 655 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 656 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 657 } 658 if (r_net->dest_state & SCTP_ADDR_PF) { 659 r_net->dest_state &= ~SCTP_ADDR_PF; 660 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 661 } 662 if (old_error_counter > 0) { 663 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 664 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 665 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 666 } 667 if (r_net == stcb->asoc.primary_destination) { 668 if (stcb->asoc.alternate) { 669 /* release the alternate, primary is good */ 670 sctp_free_remote_addr(stcb->asoc.alternate); 671 stcb->asoc.alternate = NULL; 672 } 673 } 674 /* Mobility adaptation */ 675 if (req_prim) { 676 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 677 SCTP_MOBILITY_BASE) || 678 sctp_is_mobility_feature_on(stcb->sctp_ep, 679 SCTP_MOBILITY_FASTHANDOFF)) && 680 sctp_is_mobility_feature_on(stcb->sctp_ep, 681 SCTP_MOBILITY_PRIM_DELETED)) { 682 683 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 684 stcb->sctp_ep, stcb, NULL, 685 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 686 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 687 SCTP_MOBILITY_FASTHANDOFF)) { 688 sctp_assoc_immediate_retrans(stcb, 689 stcb->asoc.primary_destination); 690 } 691 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 692 SCTP_MOBILITY_BASE)) { 693 sctp_move_chunks_from_net(stcb, 694 stcb->asoc.deleted_primary); 695 } 696 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 697 stcb->asoc.deleted_primary); 698 } 699 } 700 } 701 702 static int 703 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 704 { 705 /* 706 * return 0 means we want you to proceed with the abort non-zero 707 * means no abort processing 708 */ 709 struct sctpasochead *head; 710 711 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 712 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 713 atomic_add_int(&stcb->asoc.refcnt, 1); 714 SCTP_TCB_UNLOCK(stcb); 715 SCTP_INP_INFO_WLOCK(); 716 SCTP_TCB_LOCK(stcb); 717 atomic_subtract_int(&stcb->asoc.refcnt, 1); 718 } 719 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 720 /* generate a new vtag and send init */ 721 LIST_REMOVE(stcb, sctp_asocs); 722 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 723 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 724 /* 725 * put it in the bucket in the vtag hash of assoc's for the 726 * system 727 */ 728 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 729 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 730 SCTP_INP_INFO_WUNLOCK(); 731 return (1); 732 } 733 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 734 /* 735 * treat like a case where the cookie expired i.e.: - dump 736 * current cookie. - generate a new vtag. - resend init. 737 */ 738 /* generate a new vtag and send init */ 739 LIST_REMOVE(stcb, sctp_asocs); 740 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 741 sctp_stop_all_cookie_timers(stcb); 742 sctp_toss_old_cookies(stcb, &stcb->asoc); 743 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 744 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 745 /* 746 * put it in the bucket in the vtag hash of assoc's for the 747 * system 748 */ 749 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 750 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 751 SCTP_INP_INFO_WUNLOCK(); 752 return (1); 753 } 754 return (0); 755 } 756 757 static int 758 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 759 struct sctp_nets *net) 760 { 761 /* 762 * return 0 means we want you to proceed with the abort non-zero 763 * means no abort processing 764 */ 765 if (stcb->asoc.auth_supported == 0) { 766 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 767 return (0); 768 } 769 sctp_asconf_send_nat_state_update(stcb, net); 770 return (1); 771 } 772 773 774 /* Returns 1 if the stcb was aborted, 0 otherwise */ 775 static int 776 sctp_handle_abort(struct sctp_abort_chunk *abort, 777 struct sctp_tcb *stcb, struct sctp_nets *net) 778 { 779 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 780 struct socket *so; 781 #endif 782 uint16_t len; 783 uint16_t error; 784 785 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 786 if (stcb == NULL) 787 return (0); 788 789 len = ntohs(abort->ch.chunk_length); 790 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 791 /* 792 * Need to check the cause codes for our two magic nat 793 * aborts which don't kill the assoc necessarily. 794 */ 795 struct sctp_error_cause *cause; 796 797 cause = (struct sctp_error_cause *)(abort + 1); 798 error = ntohs(cause->code); 799 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 800 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 801 abort->ch.chunk_flags); 802 if (sctp_handle_nat_colliding_state(stcb)) { 803 return (0); 804 } 805 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 806 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 807 abort->ch.chunk_flags); 808 if (sctp_handle_nat_missing_state(stcb, net)) { 809 return (0); 810 } 811 } 812 } else { 813 error = 0; 814 } 815 /* stop any receive timers */ 816 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 817 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 818 /* notify user of the abort and clean up... */ 819 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 820 /* free the tcb */ 821 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 822 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 823 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 824 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 825 } 826 #ifdef SCTP_ASOCLOG_OF_TSNS 827 sctp_print_out_track_log(stcb); 828 #endif 829 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 830 so = SCTP_INP_SO(stcb->sctp_ep); 831 atomic_add_int(&stcb->asoc.refcnt, 1); 832 SCTP_TCB_UNLOCK(stcb); 833 SCTP_SOCKET_LOCK(so, 1); 834 SCTP_TCB_LOCK(stcb); 835 atomic_subtract_int(&stcb->asoc.refcnt, 1); 836 #endif 837 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); 838 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 839 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 840 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 841 SCTP_SOCKET_UNLOCK(so, 1); 842 #endif 843 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 844 return (1); 845 } 846 847 static void 848 sctp_start_net_timers(struct sctp_tcb *stcb) 849 { 850 uint32_t cnt_hb_sent; 851 struct sctp_nets *net; 852 853 cnt_hb_sent = 0; 854 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 855 /* 856 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 857 * If the dest in unconfirmed send a hb as well if under 858 * max_hb_burst have been sent. 859 */ 860 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 861 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 862 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 863 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 864 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 865 cnt_hb_sent++; 866 } 867 } 868 if (cnt_hb_sent) { 869 sctp_chunk_output(stcb->sctp_ep, stcb, 870 SCTP_OUTPUT_FROM_COOKIE_ACK, 871 SCTP_SO_NOT_LOCKED); 872 } 873 } 874 875 876 static void 877 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 878 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 879 { 880 struct sctp_association *asoc; 881 int some_on_streamwheel; 882 int old_state; 883 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 884 struct socket *so; 885 #endif 886 887 SCTPDBG(SCTP_DEBUG_INPUT2, 888 "sctp_handle_shutdown: handling SHUTDOWN\n"); 889 if (stcb == NULL) 890 return; 891 asoc = &stcb->asoc; 892 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 893 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 894 return; 895 } 896 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 897 /* Shutdown NOT the expected size */ 898 return; 899 } 900 old_state = SCTP_GET_STATE(stcb); 901 sctp_update_acked(stcb, cp, abort_flag); 902 if (*abort_flag) { 903 return; 904 } 905 if (asoc->control_pdapi) { 906 /* 907 * With a normal shutdown we assume the end of last record. 908 */ 909 SCTP_INP_READ_LOCK(stcb->sctp_ep); 910 if (asoc->control_pdapi->on_strm_q) { 911 struct sctp_stream_in *strm; 912 913 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 914 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 915 /* Unordered */ 916 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 917 asoc->control_pdapi->on_strm_q = 0; 918 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 919 /* Ordered */ 920 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 921 asoc->control_pdapi->on_strm_q = 0; 922 #ifdef INVARIANTS 923 } else { 924 panic("Unknown state on ctrl:%p on_strm_q:%d", 925 asoc->control_pdapi, 926 asoc->control_pdapi->on_strm_q); 927 #endif 928 } 929 } 930 asoc->control_pdapi->end_added = 1; 931 asoc->control_pdapi->pdapi_aborted = 1; 932 asoc->control_pdapi = NULL; 933 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 934 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 935 so = SCTP_INP_SO(stcb->sctp_ep); 936 atomic_add_int(&stcb->asoc.refcnt, 1); 937 SCTP_TCB_UNLOCK(stcb); 938 SCTP_SOCKET_LOCK(so, 1); 939 SCTP_TCB_LOCK(stcb); 940 atomic_subtract_int(&stcb->asoc.refcnt, 1); 941 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 942 /* assoc was freed while we were unlocked */ 943 SCTP_SOCKET_UNLOCK(so, 1); 944 return; 945 } 946 #endif 947 if (stcb->sctp_socket) { 948 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 949 } 950 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 951 SCTP_SOCKET_UNLOCK(so, 1); 952 #endif 953 } 954 /* goto SHUTDOWN_RECEIVED state to block new requests */ 955 if (stcb->sctp_socket) { 956 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 957 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 958 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 959 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 960 /* 961 * notify upper layer that peer has initiated a 962 * shutdown 963 */ 964 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 965 966 /* reset time */ 967 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 968 } 969 } 970 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 971 /* 972 * stop the shutdown timer, since we WILL move to 973 * SHUTDOWN-ACK-SENT. 974 */ 975 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 976 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 977 } 978 /* Now is there unsent data on a stream somewhere? */ 979 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 980 981 if (!TAILQ_EMPTY(&asoc->send_queue) || 982 !TAILQ_EMPTY(&asoc->sent_queue) || 983 some_on_streamwheel) { 984 /* By returning we will push more data out */ 985 return; 986 } else { 987 /* no outstanding data to send, so move on... */ 988 /* send SHUTDOWN-ACK */ 989 /* move to SHUTDOWN-ACK-SENT state */ 990 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 991 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 992 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 993 } 994 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 995 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 996 sctp_stop_timers_for_shutdown(stcb); 997 sctp_send_shutdown_ack(stcb, net); 998 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 999 stcb->sctp_ep, stcb, net); 1000 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1001 sctp_send_shutdown_ack(stcb, net); 1002 } 1003 } 1004 } 1005 1006 static void 1007 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1008 struct sctp_tcb *stcb, 1009 struct sctp_nets *net) 1010 { 1011 struct sctp_association *asoc; 1012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1013 struct socket *so; 1014 1015 so = SCTP_INP_SO(stcb->sctp_ep); 1016 #endif 1017 SCTPDBG(SCTP_DEBUG_INPUT2, 1018 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1019 if (stcb == NULL) 1020 return; 1021 1022 asoc = &stcb->asoc; 1023 /* process according to association state */ 1024 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1025 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1026 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1027 sctp_send_shutdown_complete(stcb, net, 1); 1028 SCTP_TCB_UNLOCK(stcb); 1029 return; 1030 } 1031 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 1032 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1033 /* unexpected SHUTDOWN-ACK... so ignore... */ 1034 SCTP_TCB_UNLOCK(stcb); 1035 return; 1036 } 1037 if (asoc->control_pdapi) { 1038 /* 1039 * With a normal shutdown we assume the end of last record. 1040 */ 1041 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1042 asoc->control_pdapi->end_added = 1; 1043 asoc->control_pdapi->pdapi_aborted = 1; 1044 asoc->control_pdapi = NULL; 1045 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1046 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1047 atomic_add_int(&stcb->asoc.refcnt, 1); 1048 SCTP_TCB_UNLOCK(stcb); 1049 SCTP_SOCKET_LOCK(so, 1); 1050 SCTP_TCB_LOCK(stcb); 1051 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1052 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1053 /* assoc was freed while we were unlocked */ 1054 SCTP_SOCKET_UNLOCK(so, 1); 1055 return; 1056 } 1057 #endif 1058 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1059 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1060 SCTP_SOCKET_UNLOCK(so, 1); 1061 #endif 1062 } 1063 #ifdef INVARIANTS 1064 if (!TAILQ_EMPTY(&asoc->send_queue) || 1065 !TAILQ_EMPTY(&asoc->sent_queue) || 1066 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1067 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1068 } 1069 #endif 1070 /* stop the timer */ 1071 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1072 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1073 /* send SHUTDOWN-COMPLETE */ 1074 sctp_send_shutdown_complete(stcb, net, 0); 1075 /* notify upper layer protocol */ 1076 if (stcb->sctp_socket) { 1077 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1078 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1079 stcb->sctp_socket->so_snd.sb_cc = 0; 1080 } 1081 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1082 } 1083 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1084 /* free the TCB but first save off the ep */ 1085 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1086 atomic_add_int(&stcb->asoc.refcnt, 1); 1087 SCTP_TCB_UNLOCK(stcb); 1088 SCTP_SOCKET_LOCK(so, 1); 1089 SCTP_TCB_LOCK(stcb); 1090 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1091 #endif 1092 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1093 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1094 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1095 SCTP_SOCKET_UNLOCK(so, 1); 1096 #endif 1097 } 1098 1099 static void 1100 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type, 1101 struct sctp_nets *net) 1102 { 1103 switch (chunk_type) { 1104 case SCTP_ASCONF_ACK: 1105 case SCTP_ASCONF: 1106 sctp_asconf_cleanup(stcb, net); 1107 break; 1108 case SCTP_IFORWARD_CUM_TSN: 1109 case SCTP_FORWARD_CUM_TSN: 1110 stcb->asoc.prsctp_supported = 0; 1111 break; 1112 default: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, 1114 "Peer does not support chunk type %d (0x%x).\n", 1115 chunk_type, chunk_type); 1116 break; 1117 } 1118 } 1119 1120 /* 1121 * Skip past the param header and then we will find the param that caused the 1122 * problem. There are a number of param's in a ASCONF OR the prsctp param 1123 * these will turn of specific features. 1124 * XXX: Is this the right thing to do? 1125 */ 1126 static void 1127 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1128 { 1129 switch (parameter_type) { 1130 /* pr-sctp draft */ 1131 case SCTP_PRSCTP_SUPPORTED: 1132 stcb->asoc.prsctp_supported = 0; 1133 break; 1134 case SCTP_SUPPORTED_CHUNK_EXT: 1135 break; 1136 /* draft-ietf-tsvwg-addip-sctp */ 1137 case SCTP_HAS_NAT_SUPPORT: 1138 stcb->asoc.peer_supports_nat = 0; 1139 break; 1140 case SCTP_ADD_IP_ADDRESS: 1141 case SCTP_DEL_IP_ADDRESS: 1142 case SCTP_SET_PRIM_ADDR: 1143 stcb->asoc.asconf_supported = 0; 1144 break; 1145 case SCTP_SUCCESS_REPORT: 1146 case SCTP_ERROR_CAUSE_IND: 1147 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1148 SCTPDBG(SCTP_DEBUG_INPUT2, 1149 "Turning off ASCONF to this strange peer\n"); 1150 stcb->asoc.asconf_supported = 0; 1151 break; 1152 default: 1153 SCTPDBG(SCTP_DEBUG_INPUT2, 1154 "Peer does not support param type %d (0x%x)??\n", 1155 parameter_type, parameter_type); 1156 break; 1157 } 1158 } 1159 1160 static int 1161 sctp_handle_error(struct sctp_chunkhdr *ch, 1162 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1163 { 1164 struct sctp_error_cause *cause; 1165 struct sctp_association *asoc; 1166 uint32_t remaining_length, adjust; 1167 uint16_t code, cause_code, cause_length; 1168 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1169 struct socket *so; 1170 #endif 1171 1172 /* parse through all of the errors and process */ 1173 asoc = &stcb->asoc; 1174 cause = (struct sctp_error_cause *)((caddr_t)ch + 1175 sizeof(struct sctp_chunkhdr)); 1176 remaining_length = ntohs(ch->chunk_length); 1177 if (remaining_length > limit) { 1178 remaining_length = limit; 1179 } 1180 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1181 remaining_length -= sizeof(struct sctp_chunkhdr); 1182 } else { 1183 remaining_length = 0; 1184 } 1185 code = 0; 1186 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1187 /* Process an Error Cause */ 1188 cause_code = ntohs(cause->code); 1189 cause_length = ntohs(cause->length); 1190 if ((cause_length > remaining_length) || (cause_length == 0)) { 1191 /* Invalid cause length, possibly due to truncation. */ 1192 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1193 remaining_length, cause_length); 1194 return (0); 1195 } 1196 if (code == 0) { 1197 /* report the first error cause */ 1198 code = cause_code; 1199 } 1200 switch (cause_code) { 1201 case SCTP_CAUSE_INVALID_STREAM: 1202 case SCTP_CAUSE_MISSING_PARAM: 1203 case SCTP_CAUSE_INVALID_PARAM: 1204 case SCTP_CAUSE_NO_USER_DATA: 1205 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1206 cause_code); 1207 break; 1208 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1209 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1210 ch->chunk_flags); 1211 if (sctp_handle_nat_colliding_state(stcb)) { 1212 return (0); 1213 } 1214 break; 1215 case SCTP_CAUSE_NAT_MISSING_STATE: 1216 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1217 ch->chunk_flags); 1218 if (sctp_handle_nat_missing_state(stcb, net)) { 1219 return (0); 1220 } 1221 break; 1222 case SCTP_CAUSE_STALE_COOKIE: 1223 /* 1224 * We only act if we have echoed a cookie and are 1225 * waiting. 1226 */ 1227 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1228 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1229 struct sctp_error_stale_cookie *stale_cookie; 1230 1231 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1232 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1233 /* Double it to be more robust on RTX */ 1234 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1235 asoc->cookie_preserve_req *= 2; 1236 } else { 1237 asoc->cookie_preserve_req = UINT32_MAX; 1238 } 1239 asoc->stale_cookie_count++; 1240 if (asoc->stale_cookie_count > 1241 asoc->max_init_times) { 1242 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1243 /* now free the asoc */ 1244 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1245 so = SCTP_INP_SO(stcb->sctp_ep); 1246 atomic_add_int(&stcb->asoc.refcnt, 1); 1247 SCTP_TCB_UNLOCK(stcb); 1248 SCTP_SOCKET_LOCK(so, 1); 1249 SCTP_TCB_LOCK(stcb); 1250 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1251 #endif 1252 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1253 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1254 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1255 SCTP_SOCKET_UNLOCK(so, 1); 1256 #endif 1257 return (-1); 1258 } 1259 /* blast back to INIT state */ 1260 sctp_toss_old_cookies(stcb, &stcb->asoc); 1261 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1262 sctp_stop_all_cookie_timers(stcb); 1263 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1264 } 1265 break; 1266 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1267 /* 1268 * Nothing we can do here, we don't do hostname 1269 * addresses so if the peer does not like my IPv6 1270 * (or IPv4 for that matter) it does not matter. If 1271 * they don't support that type of address, they can 1272 * NOT possibly get that packet type... i.e. with no 1273 * IPv6 you can't receive a IPv6 packet. so we can 1274 * safely ignore this one. If we ever added support 1275 * for HOSTNAME Addresses, then we would need to do 1276 * something here. 1277 */ 1278 break; 1279 case SCTP_CAUSE_UNRECOG_CHUNK: 1280 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1281 struct sctp_error_unrecognized_chunk *unrec_chunk; 1282 1283 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1284 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net); 1285 } 1286 break; 1287 case SCTP_CAUSE_UNRECOG_PARAM: 1288 /* XXX: We only consider the first parameter */ 1289 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1290 struct sctp_paramhdr *unrec_parameter; 1291 1292 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1293 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1294 } 1295 break; 1296 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1297 /* 1298 * We ignore this since the timer will drive out a 1299 * new cookie anyway and there timer will drive us 1300 * to send a SHUTDOWN_COMPLETE. We can't send one 1301 * here since we don't have their tag. 1302 */ 1303 break; 1304 case SCTP_CAUSE_DELETING_LAST_ADDR: 1305 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1306 case SCTP_CAUSE_DELETING_SRC_ADDR: 1307 /* 1308 * We should NOT get these here, but in a 1309 * ASCONF-ACK. 1310 */ 1311 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1312 cause_code); 1313 break; 1314 case SCTP_CAUSE_OUT_OF_RESC: 1315 /* 1316 * And what, pray tell do we do with the fact that 1317 * the peer is out of resources? Not really sure we 1318 * could do anything but abort. I suspect this 1319 * should have came WITH an abort instead of in a 1320 * OP-ERROR. 1321 */ 1322 break; 1323 default: 1324 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1325 cause_code); 1326 break; 1327 } 1328 adjust = SCTP_SIZE32(cause_length); 1329 if (remaining_length >= adjust) { 1330 remaining_length -= adjust; 1331 } else { 1332 remaining_length = 0; 1333 } 1334 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1335 } 1336 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1337 return (0); 1338 } 1339 1340 static int 1341 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1342 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1343 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1344 struct sctp_nets *net, int *abort_no_unlock, 1345 uint8_t mflowtype, uint32_t mflowid, 1346 uint32_t vrf_id) 1347 { 1348 struct sctp_init_ack *init_ack; 1349 struct mbuf *op_err; 1350 1351 SCTPDBG(SCTP_DEBUG_INPUT2, 1352 "sctp_handle_init_ack: handling INIT-ACK\n"); 1353 1354 if (stcb == NULL) { 1355 SCTPDBG(SCTP_DEBUG_INPUT2, 1356 "sctp_handle_init_ack: TCB is null\n"); 1357 return (-1); 1358 } 1359 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1360 /* Invalid length */ 1361 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1362 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1363 src, dst, sh, op_err, 1364 mflowtype, mflowid, 1365 vrf_id, net->port); 1366 *abort_no_unlock = 1; 1367 return (-1); 1368 } 1369 init_ack = &cp->init; 1370 /* validate parameters */ 1371 if (init_ack->initiate_tag == 0) { 1372 /* protocol error... send an abort */ 1373 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1374 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1375 src, dst, sh, op_err, 1376 mflowtype, mflowid, 1377 vrf_id, net->port); 1378 *abort_no_unlock = 1; 1379 return (-1); 1380 } 1381 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1382 /* protocol error... send an abort */ 1383 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1384 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1385 src, dst, sh, op_err, 1386 mflowtype, mflowid, 1387 vrf_id, net->port); 1388 *abort_no_unlock = 1; 1389 return (-1); 1390 } 1391 if (init_ack->num_inbound_streams == 0) { 1392 /* protocol error... send an abort */ 1393 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1394 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1395 src, dst, sh, op_err, 1396 mflowtype, mflowid, 1397 vrf_id, net->port); 1398 *abort_no_unlock = 1; 1399 return (-1); 1400 } 1401 if (init_ack->num_outbound_streams == 0) { 1402 /* protocol error... send an abort */ 1403 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1404 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1405 src, dst, sh, op_err, 1406 mflowtype, mflowid, 1407 vrf_id, net->port); 1408 *abort_no_unlock = 1; 1409 return (-1); 1410 } 1411 /* process according to association state... */ 1412 switch (SCTP_GET_STATE(stcb)) { 1413 case SCTP_STATE_COOKIE_WAIT: 1414 /* this is the expected state for this chunk */ 1415 /* process the INIT-ACK parameters */ 1416 if (stcb->asoc.primary_destination->dest_state & 1417 SCTP_ADDR_UNCONFIRMED) { 1418 /* 1419 * The primary is where we sent the INIT, we can 1420 * always consider it confirmed when the INIT-ACK is 1421 * returned. Do this before we load addresses 1422 * though. 1423 */ 1424 stcb->asoc.primary_destination->dest_state &= 1425 ~SCTP_ADDR_UNCONFIRMED; 1426 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1427 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1428 } 1429 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1430 net, abort_no_unlock, 1431 mflowtype, mflowid, 1432 vrf_id) < 0) { 1433 /* error in parsing parameters */ 1434 return (-1); 1435 } 1436 /* update our state */ 1437 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1438 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1439 1440 /* reset the RTO calc */ 1441 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1442 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1443 stcb->asoc.overall_error_count, 1444 0, 1445 SCTP_FROM_SCTP_INPUT, 1446 __LINE__); 1447 } 1448 stcb->asoc.overall_error_count = 0; 1449 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1450 /* 1451 * collapse the init timer back in case of a exponential 1452 * backoff 1453 */ 1454 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1455 stcb, net); 1456 /* 1457 * the send at the end of the inbound data processing will 1458 * cause the cookie to be sent 1459 */ 1460 break; 1461 case SCTP_STATE_SHUTDOWN_SENT: 1462 /* incorrect state... discard */ 1463 break; 1464 case SCTP_STATE_COOKIE_ECHOED: 1465 /* incorrect state... discard */ 1466 break; 1467 case SCTP_STATE_OPEN: 1468 /* incorrect state... discard */ 1469 break; 1470 case SCTP_STATE_EMPTY: 1471 case SCTP_STATE_INUSE: 1472 default: 1473 /* incorrect state... discard */ 1474 return (-1); 1475 break; 1476 } 1477 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1478 return (0); 1479 } 1480 1481 static struct sctp_tcb * 1482 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1483 struct sockaddr *src, struct sockaddr *dst, 1484 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1485 struct sctp_inpcb *inp, struct sctp_nets **netp, 1486 struct sockaddr *init_src, int *notification, 1487 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1488 uint8_t mflowtype, uint32_t mflowid, 1489 uint32_t vrf_id, uint16_t port); 1490 1491 1492 /* 1493 * handle a state cookie for an existing association m: input packet mbuf 1494 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1495 * "split" mbuf and the cookie signature does not exist offset: offset into 1496 * mbuf to the cookie-echo chunk 1497 */ 1498 static struct sctp_tcb * 1499 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1500 struct sockaddr *src, struct sockaddr *dst, 1501 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1502 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1503 struct sockaddr *init_src, int *notification, 1504 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1505 uint8_t mflowtype, uint32_t mflowid, 1506 uint32_t vrf_id, uint16_t port) 1507 { 1508 struct sctp_association *asoc; 1509 struct sctp_init_chunk *init_cp, init_buf; 1510 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1511 struct sctp_nets *net; 1512 struct mbuf *op_err; 1513 struct timeval old; 1514 int init_offset, initack_offset, i; 1515 int retval; 1516 int spec_flag = 0; 1517 uint32_t how_indx; 1518 #if defined(SCTP_DETAILED_STR_STATS) 1519 int j; 1520 #endif 1521 1522 net = *netp; 1523 /* I know that the TCB is non-NULL from the caller */ 1524 asoc = &stcb->asoc; 1525 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1526 if (asoc->cookie_how[how_indx] == 0) 1527 break; 1528 } 1529 if (how_indx < sizeof(asoc->cookie_how)) { 1530 asoc->cookie_how[how_indx] = 1; 1531 } 1532 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1533 /* SHUTDOWN came in after sending INIT-ACK */ 1534 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1535 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1536 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1537 mflowtype, mflowid, inp->fibnum, 1538 vrf_id, net->port); 1539 if (how_indx < sizeof(asoc->cookie_how)) 1540 asoc->cookie_how[how_indx] = 2; 1541 return (NULL); 1542 } 1543 /* 1544 * find and validate the INIT chunk in the cookie (peer's info) the 1545 * INIT should start after the cookie-echo header struct (chunk 1546 * header, state cookie header struct) 1547 */ 1548 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1549 1550 init_cp = (struct sctp_init_chunk *) 1551 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1552 (uint8_t *)&init_buf); 1553 if (init_cp == NULL) { 1554 /* could not pull a INIT chunk in cookie */ 1555 return (NULL); 1556 } 1557 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1558 return (NULL); 1559 } 1560 /* 1561 * find and validate the INIT-ACK chunk in the cookie (my info) the 1562 * INIT-ACK follows the INIT chunk 1563 */ 1564 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1565 initack_cp = (struct sctp_init_ack_chunk *) 1566 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1567 (uint8_t *)&initack_buf); 1568 if (initack_cp == NULL) { 1569 /* could not pull INIT-ACK chunk in cookie */ 1570 return (NULL); 1571 } 1572 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1573 return (NULL); 1574 } 1575 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1576 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1577 /* 1578 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1579 * to get into the OPEN state 1580 */ 1581 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1582 /*- 1583 * Opps, this means that we somehow generated two vtag's 1584 * the same. I.e. we did: 1585 * Us Peer 1586 * <---INIT(tag=a)------ 1587 * ----INIT-ACK(tag=t)--> 1588 * ----INIT(tag=t)------> *1 1589 * <---INIT-ACK(tag=a)--- 1590 * <----CE(tag=t)------------- *2 1591 * 1592 * At point *1 we should be generating a different 1593 * tag t'. Which means we would throw away the CE and send 1594 * ours instead. Basically this is case C (throw away side). 1595 */ 1596 if (how_indx < sizeof(asoc->cookie_how)) 1597 asoc->cookie_how[how_indx] = 17; 1598 return (NULL); 1599 1600 } 1601 switch (SCTP_GET_STATE(stcb)) { 1602 case SCTP_STATE_COOKIE_WAIT: 1603 case SCTP_STATE_COOKIE_ECHOED: 1604 /* 1605 * INIT was sent but got a COOKIE_ECHO with the 1606 * correct tags... just accept it...but we must 1607 * process the init so that we can make sure we have 1608 * the right seq no's. 1609 */ 1610 /* First we must process the INIT !! */ 1611 retval = sctp_process_init(init_cp, stcb); 1612 if (retval < 0) { 1613 if (how_indx < sizeof(asoc->cookie_how)) 1614 asoc->cookie_how[how_indx] = 3; 1615 return (NULL); 1616 } 1617 /* we have already processed the INIT so no problem */ 1618 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1619 stcb, net, 1620 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1621 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1622 stcb, net, 1623 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1624 /* update current state */ 1625 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1626 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1627 else 1628 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1629 1630 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1631 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1632 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1633 stcb->sctp_ep, stcb, asoc->primary_destination); 1634 } 1635 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1636 sctp_stop_all_cookie_timers(stcb); 1637 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1638 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1639 (!SCTP_IS_LISTENING(inp))) { 1640 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1641 struct socket *so; 1642 #endif 1643 /* 1644 * Here is where collision would go if we 1645 * did a connect() and instead got a 1646 * init/init-ack/cookie done before the 1647 * init-ack came back.. 1648 */ 1649 stcb->sctp_ep->sctp_flags |= 1650 SCTP_PCB_FLAGS_CONNECTED; 1651 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1652 so = SCTP_INP_SO(stcb->sctp_ep); 1653 atomic_add_int(&stcb->asoc.refcnt, 1); 1654 SCTP_TCB_UNLOCK(stcb); 1655 SCTP_SOCKET_LOCK(so, 1); 1656 SCTP_TCB_LOCK(stcb); 1657 atomic_add_int(&stcb->asoc.refcnt, -1); 1658 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1659 SCTP_SOCKET_UNLOCK(so, 1); 1660 return (NULL); 1661 } 1662 #endif 1663 soisconnected(stcb->sctp_socket); 1664 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1665 SCTP_SOCKET_UNLOCK(so, 1); 1666 #endif 1667 } 1668 /* notify upper layer */ 1669 *notification = SCTP_NOTIFY_ASSOC_UP; 1670 /* 1671 * since we did not send a HB make sure we don't 1672 * double things 1673 */ 1674 old.tv_sec = cookie->time_entered.tv_sec; 1675 old.tv_usec = cookie->time_entered.tv_usec; 1676 net->hb_responded = 1; 1677 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1678 &old, 1679 SCTP_RTT_FROM_NON_DATA); 1680 1681 if (stcb->asoc.sctp_autoclose_ticks && 1682 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1683 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1684 inp, stcb, NULL); 1685 } 1686 break; 1687 default: 1688 /* 1689 * we're in the OPEN state (or beyond), so peer must 1690 * have simply lost the COOKIE-ACK 1691 */ 1692 break; 1693 } /* end switch */ 1694 sctp_stop_all_cookie_timers(stcb); 1695 /* 1696 * We ignore the return code here.. not sure if we should 1697 * somehow abort.. but we do have an existing asoc. This 1698 * really should not fail. 1699 */ 1700 if (sctp_load_addresses_from_init(stcb, m, 1701 init_offset + sizeof(struct sctp_init_chunk), 1702 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1703 if (how_indx < sizeof(asoc->cookie_how)) 1704 asoc->cookie_how[how_indx] = 4; 1705 return (NULL); 1706 } 1707 /* respond with a COOKIE-ACK */ 1708 sctp_toss_old_cookies(stcb, asoc); 1709 sctp_send_cookie_ack(stcb); 1710 if (how_indx < sizeof(asoc->cookie_how)) 1711 asoc->cookie_how[how_indx] = 5; 1712 return (stcb); 1713 } 1714 1715 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1716 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1717 cookie->tie_tag_my_vtag == 0 && 1718 cookie->tie_tag_peer_vtag == 0) { 1719 /* 1720 * case C in Section 5.2.4 Table 2: XMOO silently discard 1721 */ 1722 if (how_indx < sizeof(asoc->cookie_how)) 1723 asoc->cookie_how[how_indx] = 6; 1724 return (NULL); 1725 } 1726 /* 1727 * If nat support, and the below and stcb is established, send back 1728 * a ABORT(colliding state) if we are established. 1729 */ 1730 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1731 (asoc->peer_supports_nat) && 1732 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1733 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1734 (asoc->peer_vtag == 0)))) { 1735 /* 1736 * Special case - Peer's support nat. We may have two init's 1737 * that we gave out the same tag on since one was not 1738 * established.. i.e. we get INIT from host-1 behind the nat 1739 * and we respond tag-a, we get a INIT from host-2 behind 1740 * the nat and we get tag-a again. Then we bring up host-1 1741 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1742 * Now we have colliding state. We must send an abort here 1743 * with colliding state indication. 1744 */ 1745 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1746 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1747 mflowtype, mflowid, inp->fibnum, 1748 vrf_id, port); 1749 return (NULL); 1750 } 1751 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1752 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1753 (asoc->peer_vtag == 0))) { 1754 /* 1755 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1756 * should be ok, re-accept peer info 1757 */ 1758 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1759 /* 1760 * Extension of case C. If we hit this, then the 1761 * random number generator returned the same vtag 1762 * when we first sent our INIT-ACK and when we later 1763 * sent our INIT. The side with the seq numbers that 1764 * are different will be the one that normnally 1765 * would have hit case C. This in effect "extends" 1766 * our vtags in this collision case to be 64 bits. 1767 * The same collision could occur aka you get both 1768 * vtag and seq number the same twice in a row.. but 1769 * is much less likely. If it did happen then we 1770 * would proceed through and bring up the assoc.. we 1771 * may end up with the wrong stream setup however.. 1772 * which would be bad.. but there is no way to 1773 * tell.. until we send on a stream that does not 1774 * exist :-) 1775 */ 1776 if (how_indx < sizeof(asoc->cookie_how)) 1777 asoc->cookie_how[how_indx] = 7; 1778 1779 return (NULL); 1780 } 1781 if (how_indx < sizeof(asoc->cookie_how)) 1782 asoc->cookie_how[how_indx] = 8; 1783 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1784 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1785 sctp_stop_all_cookie_timers(stcb); 1786 /* 1787 * since we did not send a HB make sure we don't double 1788 * things 1789 */ 1790 net->hb_responded = 1; 1791 if (stcb->asoc.sctp_autoclose_ticks && 1792 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1793 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1794 NULL); 1795 } 1796 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1797 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1798 1799 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1800 /* 1801 * Ok the peer probably discarded our data (if we 1802 * echoed a cookie+data). So anything on the 1803 * sent_queue should be marked for retransmit, we 1804 * may not get something to kick us so it COULD 1805 * still take a timeout to move these.. but it can't 1806 * hurt to mark them. 1807 */ 1808 struct sctp_tmit_chunk *chk; 1809 1810 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1811 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1812 chk->sent = SCTP_DATAGRAM_RESEND; 1813 sctp_flight_size_decrease(chk); 1814 sctp_total_flight_decrease(stcb, chk); 1815 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1816 spec_flag++; 1817 } 1818 } 1819 1820 } 1821 /* process the INIT info (peer's info) */ 1822 retval = sctp_process_init(init_cp, stcb); 1823 if (retval < 0) { 1824 if (how_indx < sizeof(asoc->cookie_how)) 1825 asoc->cookie_how[how_indx] = 9; 1826 return (NULL); 1827 } 1828 if (sctp_load_addresses_from_init(stcb, m, 1829 init_offset + sizeof(struct sctp_init_chunk), 1830 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1831 if (how_indx < sizeof(asoc->cookie_how)) 1832 asoc->cookie_how[how_indx] = 10; 1833 return (NULL); 1834 } 1835 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1836 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1837 *notification = SCTP_NOTIFY_ASSOC_UP; 1838 1839 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1840 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1841 (!SCTP_IS_LISTENING(inp))) { 1842 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1843 struct socket *so; 1844 #endif 1845 stcb->sctp_ep->sctp_flags |= 1846 SCTP_PCB_FLAGS_CONNECTED; 1847 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1848 so = SCTP_INP_SO(stcb->sctp_ep); 1849 atomic_add_int(&stcb->asoc.refcnt, 1); 1850 SCTP_TCB_UNLOCK(stcb); 1851 SCTP_SOCKET_LOCK(so, 1); 1852 SCTP_TCB_LOCK(stcb); 1853 atomic_add_int(&stcb->asoc.refcnt, -1); 1854 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1855 SCTP_SOCKET_UNLOCK(so, 1); 1856 return (NULL); 1857 } 1858 #endif 1859 soisconnected(stcb->sctp_socket); 1860 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1861 SCTP_SOCKET_UNLOCK(so, 1); 1862 #endif 1863 } 1864 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1865 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1866 else 1867 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1868 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1869 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1870 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1871 } else { 1872 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1873 } 1874 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1875 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1876 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1877 stcb->sctp_ep, stcb, asoc->primary_destination); 1878 } 1879 sctp_stop_all_cookie_timers(stcb); 1880 sctp_toss_old_cookies(stcb, asoc); 1881 sctp_send_cookie_ack(stcb); 1882 if (spec_flag) { 1883 /* 1884 * only if we have retrans set do we do this. What 1885 * this call does is get only the COOKIE-ACK out and 1886 * then when we return the normal call to 1887 * sctp_chunk_output will get the retrans out behind 1888 * this. 1889 */ 1890 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1891 } 1892 if (how_indx < sizeof(asoc->cookie_how)) 1893 asoc->cookie_how[how_indx] = 11; 1894 1895 return (stcb); 1896 } 1897 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1898 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1899 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1900 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1901 cookie->tie_tag_peer_vtag != 0) { 1902 struct sctpasochead *head; 1903 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1904 struct socket *so; 1905 #endif 1906 1907 if (asoc->peer_supports_nat) { 1908 /* 1909 * This is a gross gross hack. Just call the 1910 * cookie_new code since we are allowing a duplicate 1911 * association. I hope this works... 1912 */ 1913 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1914 sh, cookie, cookie_len, 1915 inp, netp, init_src, notification, 1916 auth_skipped, auth_offset, auth_len, 1917 mflowtype, mflowid, 1918 vrf_id, port)); 1919 } 1920 /* 1921 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1922 */ 1923 /* temp code */ 1924 if (how_indx < sizeof(asoc->cookie_how)) 1925 asoc->cookie_how[how_indx] = 12; 1926 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1927 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1928 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1929 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1930 1931 /* notify upper layer */ 1932 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1933 atomic_add_int(&stcb->asoc.refcnt, 1); 1934 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1935 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1936 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1937 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1938 } 1939 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1940 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1941 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1942 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1943 } 1944 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1945 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1946 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1947 stcb->sctp_ep, stcb, asoc->primary_destination); 1948 1949 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1950 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1951 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1952 } 1953 asoc->pre_open_streams = 1954 ntohs(initack_cp->init.num_outbound_streams); 1955 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1956 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1957 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1958 1959 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1960 1961 asoc->str_reset_seq_in = asoc->init_seq_number; 1962 1963 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1964 if (asoc->mapping_array) { 1965 memset(asoc->mapping_array, 0, 1966 asoc->mapping_array_size); 1967 } 1968 if (asoc->nr_mapping_array) { 1969 memset(asoc->nr_mapping_array, 0, 1970 asoc->mapping_array_size); 1971 } 1972 SCTP_TCB_UNLOCK(stcb); 1973 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1974 so = SCTP_INP_SO(stcb->sctp_ep); 1975 SCTP_SOCKET_LOCK(so, 1); 1976 #endif 1977 SCTP_INP_INFO_WLOCK(); 1978 SCTP_INP_WLOCK(stcb->sctp_ep); 1979 SCTP_TCB_LOCK(stcb); 1980 atomic_add_int(&stcb->asoc.refcnt, -1); 1981 /* send up all the data */ 1982 SCTP_TCB_SEND_LOCK(stcb); 1983 1984 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1985 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1986 stcb->asoc.strmout[i].chunks_on_queues = 0; 1987 #if defined(SCTP_DETAILED_STR_STATS) 1988 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1989 asoc->strmout[i].abandoned_sent[j] = 0; 1990 asoc->strmout[i].abandoned_unsent[j] = 0; 1991 } 1992 #else 1993 asoc->strmout[i].abandoned_sent[0] = 0; 1994 asoc->strmout[i].abandoned_unsent[0] = 0; 1995 #endif 1996 stcb->asoc.strmout[i].sid = i; 1997 stcb->asoc.strmout[i].next_mid_ordered = 0; 1998 stcb->asoc.strmout[i].next_mid_unordered = 0; 1999 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2000 } 2001 /* process the INIT-ACK info (my info) */ 2002 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2003 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2004 2005 /* pull from vtag hash */ 2006 LIST_REMOVE(stcb, sctp_asocs); 2007 /* re-insert to new vtag position */ 2008 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2009 SCTP_BASE_INFO(hashasocmark))]; 2010 /* 2011 * put it in the bucket in the vtag hash of assoc's for the 2012 * system 2013 */ 2014 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2015 2016 SCTP_TCB_SEND_UNLOCK(stcb); 2017 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2018 SCTP_INP_INFO_WUNLOCK(); 2019 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2020 SCTP_SOCKET_UNLOCK(so, 1); 2021 #endif 2022 asoc->total_flight = 0; 2023 asoc->total_flight_count = 0; 2024 /* process the INIT info (peer's info) */ 2025 retval = sctp_process_init(init_cp, stcb); 2026 if (retval < 0) { 2027 if (how_indx < sizeof(asoc->cookie_how)) 2028 asoc->cookie_how[how_indx] = 13; 2029 2030 return (NULL); 2031 } 2032 /* 2033 * since we did not send a HB make sure we don't double 2034 * things 2035 */ 2036 net->hb_responded = 1; 2037 2038 if (sctp_load_addresses_from_init(stcb, m, 2039 init_offset + sizeof(struct sctp_init_chunk), 2040 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2041 if (how_indx < sizeof(asoc->cookie_how)) 2042 asoc->cookie_how[how_indx] = 14; 2043 2044 return (NULL); 2045 } 2046 /* respond with a COOKIE-ACK */ 2047 sctp_stop_all_cookie_timers(stcb); 2048 sctp_toss_old_cookies(stcb, asoc); 2049 sctp_send_cookie_ack(stcb); 2050 if (how_indx < sizeof(asoc->cookie_how)) 2051 asoc->cookie_how[how_indx] = 15; 2052 2053 return (stcb); 2054 } 2055 if (how_indx < sizeof(asoc->cookie_how)) 2056 asoc->cookie_how[how_indx] = 16; 2057 /* all other cases... */ 2058 return (NULL); 2059 } 2060 2061 2062 /* 2063 * handle a state cookie for a new association m: input packet mbuf chain-- 2064 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2065 * and the cookie signature does not exist offset: offset into mbuf to the 2066 * cookie-echo chunk length: length of the cookie chunk to: where the init 2067 * was from returns a new TCB 2068 */ 2069 static struct sctp_tcb * 2070 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2071 struct sockaddr *src, struct sockaddr *dst, 2072 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2073 struct sctp_inpcb *inp, struct sctp_nets **netp, 2074 struct sockaddr *init_src, int *notification, 2075 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2076 uint8_t mflowtype, uint32_t mflowid, 2077 uint32_t vrf_id, uint16_t port) 2078 { 2079 struct sctp_tcb *stcb; 2080 struct sctp_init_chunk *init_cp, init_buf; 2081 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2082 union sctp_sockstore store; 2083 struct sctp_association *asoc; 2084 int init_offset, initack_offset, initack_limit; 2085 int retval; 2086 int error = 0; 2087 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2088 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2089 struct socket *so; 2090 2091 so = SCTP_INP_SO(inp); 2092 #endif 2093 2094 /* 2095 * find and validate the INIT chunk in the cookie (peer's info) the 2096 * INIT should start after the cookie-echo header struct (chunk 2097 * header, state cookie header struct) 2098 */ 2099 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2100 init_cp = (struct sctp_init_chunk *) 2101 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2102 (uint8_t *)&init_buf); 2103 if (init_cp == NULL) { 2104 /* could not pull a INIT chunk in cookie */ 2105 SCTPDBG(SCTP_DEBUG_INPUT1, 2106 "process_cookie_new: could not pull INIT chunk hdr\n"); 2107 return (NULL); 2108 } 2109 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2110 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2111 return (NULL); 2112 } 2113 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2114 /* 2115 * find and validate the INIT-ACK chunk in the cookie (my info) the 2116 * INIT-ACK follows the INIT chunk 2117 */ 2118 initack_cp = (struct sctp_init_ack_chunk *) 2119 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2120 (uint8_t *)&initack_buf); 2121 if (initack_cp == NULL) { 2122 /* could not pull INIT-ACK chunk in cookie */ 2123 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2124 return (NULL); 2125 } 2126 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2127 return (NULL); 2128 } 2129 /* 2130 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2131 * "initack_limit" value. This is because the chk_length field 2132 * includes the length of the cookie, but the cookie is omitted when 2133 * the INIT and INIT_ACK are tacked onto the cookie... 2134 */ 2135 initack_limit = offset + cookie_len; 2136 2137 /* 2138 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2139 * and popluate 2140 */ 2141 2142 /* 2143 * Here we do a trick, we set in NULL for the proc/thread argument. 2144 * We do this since in effect we only use the p argument when the 2145 * socket is unbound and we must do an implicit bind. Since we are 2146 * getting a cookie, we cannot be unbound. 2147 */ 2148 stcb = sctp_aloc_assoc(inp, init_src, &error, 2149 ntohl(initack_cp->init.initiate_tag), vrf_id, 2150 ntohs(initack_cp->init.num_outbound_streams), 2151 port, 2152 (struct thread *)NULL, 2153 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2154 if (stcb == NULL) { 2155 struct mbuf *op_err; 2156 2157 /* memory problem? */ 2158 SCTPDBG(SCTP_DEBUG_INPUT1, 2159 "process_cookie_new: no room for another TCB!\n"); 2160 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2161 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2162 src, dst, sh, op_err, 2163 mflowtype, mflowid, 2164 vrf_id, port); 2165 return (NULL); 2166 } 2167 /* get the correct sctp_nets */ 2168 if (netp) 2169 *netp = sctp_findnet(stcb, init_src); 2170 2171 asoc = &stcb->asoc; 2172 /* get scope variables out of cookie */ 2173 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2174 asoc->scope.site_scope = cookie->site_scope; 2175 asoc->scope.local_scope = cookie->local_scope; 2176 asoc->scope.loopback_scope = cookie->loopback_scope; 2177 2178 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2179 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2180 struct mbuf *op_err; 2181 2182 /* 2183 * Houston we have a problem. The EP changed while the 2184 * cookie was in flight. Only recourse is to abort the 2185 * association. 2186 */ 2187 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2188 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2189 src, dst, sh, op_err, 2190 mflowtype, mflowid, 2191 vrf_id, port); 2192 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2193 atomic_add_int(&stcb->asoc.refcnt, 1); 2194 SCTP_TCB_UNLOCK(stcb); 2195 SCTP_SOCKET_LOCK(so, 1); 2196 SCTP_TCB_LOCK(stcb); 2197 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2198 #endif 2199 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2200 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2202 SCTP_SOCKET_UNLOCK(so, 1); 2203 #endif 2204 return (NULL); 2205 } 2206 /* process the INIT-ACK info (my info) */ 2207 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2208 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2209 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2210 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2211 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2212 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2213 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2214 asoc->str_reset_seq_in = asoc->init_seq_number; 2215 2216 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2217 2218 /* process the INIT info (peer's info) */ 2219 if (netp) 2220 retval = sctp_process_init(init_cp, stcb); 2221 else 2222 retval = 0; 2223 if (retval < 0) { 2224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2225 atomic_add_int(&stcb->asoc.refcnt, 1); 2226 SCTP_TCB_UNLOCK(stcb); 2227 SCTP_SOCKET_LOCK(so, 1); 2228 SCTP_TCB_LOCK(stcb); 2229 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2230 #endif 2231 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2232 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2233 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2234 SCTP_SOCKET_UNLOCK(so, 1); 2235 #endif 2236 return (NULL); 2237 } 2238 /* load all addresses */ 2239 if (sctp_load_addresses_from_init(stcb, m, 2240 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2241 src, dst, init_src, port)) { 2242 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2243 atomic_add_int(&stcb->asoc.refcnt, 1); 2244 SCTP_TCB_UNLOCK(stcb); 2245 SCTP_SOCKET_LOCK(so, 1); 2246 SCTP_TCB_LOCK(stcb); 2247 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2248 #endif 2249 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2250 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2252 SCTP_SOCKET_UNLOCK(so, 1); 2253 #endif 2254 return (NULL); 2255 } 2256 /* 2257 * verify any preceding AUTH chunk that was skipped 2258 */ 2259 /* pull the local authentication parameters from the cookie/init-ack */ 2260 sctp_auth_get_cookie_params(stcb, m, 2261 initack_offset + sizeof(struct sctp_init_ack_chunk), 2262 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2263 if (auth_skipped) { 2264 struct sctp_auth_chunk *auth; 2265 2266 auth = (struct sctp_auth_chunk *) 2267 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2268 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2269 /* auth HMAC failed, dump the assoc and packet */ 2270 SCTPDBG(SCTP_DEBUG_AUTH1, 2271 "COOKIE-ECHO: AUTH failed\n"); 2272 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2273 atomic_add_int(&stcb->asoc.refcnt, 1); 2274 SCTP_TCB_UNLOCK(stcb); 2275 SCTP_SOCKET_LOCK(so, 1); 2276 SCTP_TCB_LOCK(stcb); 2277 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2278 #endif 2279 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2280 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2281 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2282 SCTP_SOCKET_UNLOCK(so, 1); 2283 #endif 2284 return (NULL); 2285 } else { 2286 /* remaining chunks checked... good to go */ 2287 stcb->asoc.authenticated = 1; 2288 } 2289 } 2290 2291 /* 2292 * if we're doing ASCONFs, check to see if we have any new local 2293 * addresses that need to get added to the peer (eg. addresses 2294 * changed while cookie echo in flight). This needs to be done 2295 * after we go to the OPEN state to do the correct asconf 2296 * processing. else, make sure we have the correct addresses in our 2297 * lists 2298 */ 2299 2300 /* warning, we re-use sin, sin6, sa_store here! */ 2301 /* pull in local_address (our "from" address) */ 2302 switch (cookie->laddr_type) { 2303 #ifdef INET 2304 case SCTP_IPV4_ADDRESS: 2305 /* source addr is IPv4 */ 2306 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2307 store.sin.sin_family = AF_INET; 2308 store.sin.sin_len = sizeof(struct sockaddr_in); 2309 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2310 break; 2311 #endif 2312 #ifdef INET6 2313 case SCTP_IPV6_ADDRESS: 2314 /* source addr is IPv6 */ 2315 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2316 store.sin6.sin6_family = AF_INET6; 2317 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2318 store.sin6.sin6_scope_id = cookie->scope_id; 2319 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2320 break; 2321 #endif 2322 default: 2323 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2324 atomic_add_int(&stcb->asoc.refcnt, 1); 2325 SCTP_TCB_UNLOCK(stcb); 2326 SCTP_SOCKET_LOCK(so, 1); 2327 SCTP_TCB_LOCK(stcb); 2328 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2329 #endif 2330 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2331 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2332 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2333 SCTP_SOCKET_UNLOCK(so, 1); 2334 #endif 2335 return (NULL); 2336 } 2337 2338 /* update current state */ 2339 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2340 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2341 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2342 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2343 stcb->sctp_ep, stcb, asoc->primary_destination); 2344 } 2345 sctp_stop_all_cookie_timers(stcb); 2346 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2347 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2348 2349 /* set up to notify upper layer */ 2350 *notification = SCTP_NOTIFY_ASSOC_UP; 2351 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2352 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2353 (!SCTP_IS_LISTENING(inp))) { 2354 /* 2355 * This is an endpoint that called connect() how it got a 2356 * cookie that is NEW is a bit of a mystery. It must be that 2357 * the INIT was sent, but before it got there.. a complete 2358 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2359 * should have went to the other code.. not here.. oh well.. 2360 * a bit of protection is worth having.. 2361 */ 2362 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2363 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2364 atomic_add_int(&stcb->asoc.refcnt, 1); 2365 SCTP_TCB_UNLOCK(stcb); 2366 SCTP_SOCKET_LOCK(so, 1); 2367 SCTP_TCB_LOCK(stcb); 2368 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2369 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2370 SCTP_SOCKET_UNLOCK(so, 1); 2371 return (NULL); 2372 } 2373 #endif 2374 soisconnected(stcb->sctp_socket); 2375 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2376 SCTP_SOCKET_UNLOCK(so, 1); 2377 #endif 2378 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2379 (SCTP_IS_LISTENING(inp))) { 2380 /* 2381 * We don't want to do anything with this one. Since it is 2382 * the listening guy. The timer will get started for 2383 * accepted connections in the caller. 2384 */ 2385 ; 2386 } 2387 /* since we did not send a HB make sure we don't double things */ 2388 if ((netp) && (*netp)) 2389 (*netp)->hb_responded = 1; 2390 2391 if (stcb->asoc.sctp_autoclose_ticks && 2392 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2393 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2394 } 2395 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2396 if ((netp != NULL) && (*netp != NULL)) { 2397 struct timeval old; 2398 2399 /* calculate the RTT and set the encaps port */ 2400 old.tv_sec = cookie->time_entered.tv_sec; 2401 old.tv_usec = cookie->time_entered.tv_usec; 2402 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2403 &old, SCTP_RTT_FROM_NON_DATA); 2404 } 2405 /* respond with a COOKIE-ACK */ 2406 sctp_send_cookie_ack(stcb); 2407 2408 /* 2409 * check the address lists for any ASCONFs that need to be sent 2410 * AFTER the cookie-ack is sent 2411 */ 2412 sctp_check_address_list(stcb, m, 2413 initack_offset + sizeof(struct sctp_init_ack_chunk), 2414 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2415 &store.sa, cookie->local_scope, cookie->site_scope, 2416 cookie->ipv4_scope, cookie->loopback_scope); 2417 2418 2419 return (stcb); 2420 } 2421 2422 /* 2423 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2424 * we NEED to make sure we are not already using the vtag. If so we 2425 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2426 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2427 SCTP_BASE_INFO(hashasocmark))]; 2428 LIST_FOREACH(stcb, head, sctp_asocs) { 2429 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2430 -- SEND ABORT - TRY AGAIN -- 2431 } 2432 } 2433 */ 2434 2435 /* 2436 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2437 * existing (non-NULL) TCB 2438 */ 2439 static struct mbuf * 2440 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2441 struct sockaddr *src, struct sockaddr *dst, 2442 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2443 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2444 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2445 struct sctp_tcb **locked_tcb, 2446 uint8_t mflowtype, uint32_t mflowid, 2447 uint32_t vrf_id, uint16_t port) 2448 { 2449 struct sctp_state_cookie *cookie; 2450 struct sctp_tcb *l_stcb = *stcb; 2451 struct sctp_inpcb *l_inp; 2452 struct sockaddr *to; 2453 struct sctp_pcb *ep; 2454 struct mbuf *m_sig; 2455 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2456 uint8_t *sig; 2457 uint8_t cookie_ok = 0; 2458 unsigned int sig_offset, cookie_offset; 2459 unsigned int cookie_len; 2460 struct timeval now; 2461 struct timeval time_expires; 2462 int notification = 0; 2463 struct sctp_nets *netl; 2464 int had_a_existing_tcb = 0; 2465 int send_int_conf = 0; 2466 #ifdef INET 2467 struct sockaddr_in sin; 2468 #endif 2469 #ifdef INET6 2470 struct sockaddr_in6 sin6; 2471 #endif 2472 2473 SCTPDBG(SCTP_DEBUG_INPUT2, 2474 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2475 2476 if (inp_p == NULL) { 2477 return (NULL); 2478 } 2479 cookie = &cp->cookie; 2480 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2481 cookie_len = ntohs(cp->ch.chunk_length); 2482 2483 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2484 sizeof(struct sctp_init_chunk) + 2485 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2486 /* cookie too small */ 2487 return (NULL); 2488 } 2489 if ((cookie->peerport != sh->src_port) || 2490 (cookie->myport != sh->dest_port) || 2491 (cookie->my_vtag != sh->v_tag)) { 2492 /* 2493 * invalid ports or bad tag. Note that we always leave the 2494 * v_tag in the header in network order and when we stored 2495 * it in the my_vtag slot we also left it in network order. 2496 * This maintains the match even though it may be in the 2497 * opposite byte order of the machine :-> 2498 */ 2499 return (NULL); 2500 } 2501 /* 2502 * split off the signature into its own mbuf (since it should not be 2503 * calculated in the sctp_hmac_m() call). 2504 */ 2505 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2506 m_sig = m_split(m, sig_offset, M_NOWAIT); 2507 if (m_sig == NULL) { 2508 /* out of memory or ?? */ 2509 return (NULL); 2510 } 2511 #ifdef SCTP_MBUF_LOGGING 2512 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2513 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2514 } 2515 #endif 2516 2517 /* 2518 * compute the signature/digest for the cookie 2519 */ 2520 ep = &(*inp_p)->sctp_ep; 2521 l_inp = *inp_p; 2522 if (l_stcb) { 2523 SCTP_TCB_UNLOCK(l_stcb); 2524 } 2525 SCTP_INP_RLOCK(l_inp); 2526 if (l_stcb) { 2527 SCTP_TCB_LOCK(l_stcb); 2528 } 2529 /* which cookie is it? */ 2530 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2531 (ep->current_secret_number != ep->last_secret_number)) { 2532 /* it's the old cookie */ 2533 (void)sctp_hmac_m(SCTP_HMAC, 2534 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2535 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2536 } else { 2537 /* it's the current cookie */ 2538 (void)sctp_hmac_m(SCTP_HMAC, 2539 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2540 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2541 } 2542 /* get the signature */ 2543 SCTP_INP_RUNLOCK(l_inp); 2544 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2545 if (sig == NULL) { 2546 /* couldn't find signature */ 2547 sctp_m_freem(m_sig); 2548 return (NULL); 2549 } 2550 /* compare the received digest with the computed digest */ 2551 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2552 /* try the old cookie? */ 2553 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2554 (ep->current_secret_number != ep->last_secret_number)) { 2555 /* compute digest with old */ 2556 (void)sctp_hmac_m(SCTP_HMAC, 2557 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2558 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2559 /* compare */ 2560 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2561 cookie_ok = 1; 2562 } 2563 } else { 2564 cookie_ok = 1; 2565 } 2566 2567 /* 2568 * Now before we continue we must reconstruct our mbuf so that 2569 * normal processing of any other chunks will work. 2570 */ 2571 { 2572 struct mbuf *m_at; 2573 2574 m_at = m; 2575 while (SCTP_BUF_NEXT(m_at) != NULL) { 2576 m_at = SCTP_BUF_NEXT(m_at); 2577 } 2578 SCTP_BUF_NEXT(m_at) = m_sig; 2579 } 2580 2581 if (cookie_ok == 0) { 2582 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2583 SCTPDBG(SCTP_DEBUG_INPUT2, 2584 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2585 (uint32_t)offset, cookie_offset, sig_offset); 2586 return (NULL); 2587 } 2588 2589 /* 2590 * check the cookie timestamps to be sure it's not stale 2591 */ 2592 (void)SCTP_GETTIME_TIMEVAL(&now); 2593 /* Expire time is in Ticks, so we convert to seconds */ 2594 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2595 time_expires.tv_usec = cookie->time_entered.tv_usec; 2596 if (timevalcmp(&now, &time_expires, >)) { 2597 /* cookie is stale! */ 2598 struct mbuf *op_err; 2599 struct sctp_error_stale_cookie *cause; 2600 struct timeval diff; 2601 uint32_t staleness; 2602 2603 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2604 0, M_NOWAIT, 1, MT_DATA); 2605 if (op_err == NULL) { 2606 /* FOOBAR */ 2607 return (NULL); 2608 } 2609 /* Set the len */ 2610 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2611 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2612 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2613 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2614 (sizeof(uint32_t)))); 2615 diff = now; 2616 timevalsub(&diff, &time_expires); 2617 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2618 staleness = UINT32_MAX; 2619 } else { 2620 staleness = diff.tv_sec * 1000000; 2621 } 2622 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2623 staleness += diff.tv_usec; 2624 } else { 2625 staleness = UINT32_MAX; 2626 } 2627 cause->stale_time = htonl(staleness); 2628 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2629 mflowtype, mflowid, l_inp->fibnum, 2630 vrf_id, port); 2631 return (NULL); 2632 } 2633 /* 2634 * Now we must see with the lookup address if we have an existing 2635 * asoc. This will only happen if we were in the COOKIE-WAIT state 2636 * and a INIT collided with us and somewhere the peer sent the 2637 * cookie on another address besides the single address our assoc 2638 * had for him. In this case we will have one of the tie-tags set at 2639 * least AND the address field in the cookie can be used to look it 2640 * up. 2641 */ 2642 to = NULL; 2643 switch (cookie->addr_type) { 2644 #ifdef INET6 2645 case SCTP_IPV6_ADDRESS: 2646 memset(&sin6, 0, sizeof(sin6)); 2647 sin6.sin6_family = AF_INET6; 2648 sin6.sin6_len = sizeof(sin6); 2649 sin6.sin6_port = sh->src_port; 2650 sin6.sin6_scope_id = cookie->scope_id; 2651 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2652 sizeof(sin6.sin6_addr.s6_addr)); 2653 to = (struct sockaddr *)&sin6; 2654 break; 2655 #endif 2656 #ifdef INET 2657 case SCTP_IPV4_ADDRESS: 2658 memset(&sin, 0, sizeof(sin)); 2659 sin.sin_family = AF_INET; 2660 sin.sin_len = sizeof(sin); 2661 sin.sin_port = sh->src_port; 2662 sin.sin_addr.s_addr = cookie->address[0]; 2663 to = (struct sockaddr *)&sin; 2664 break; 2665 #endif 2666 default: 2667 /* This should not happen */ 2668 return (NULL); 2669 } 2670 if (*stcb == NULL) { 2671 /* Yep, lets check */ 2672 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2673 if (*stcb == NULL) { 2674 /* 2675 * We should have only got back the same inp. If we 2676 * got back a different ep we have a problem. The 2677 * original findep got back l_inp and now 2678 */ 2679 if (l_inp != *inp_p) { 2680 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2681 } 2682 } else { 2683 if (*locked_tcb == NULL) { 2684 /* 2685 * In this case we found the assoc only 2686 * after we locked the create lock. This 2687 * means we are in a colliding case and we 2688 * must make sure that we unlock the tcb if 2689 * its one of the cases where we throw away 2690 * the incoming packets. 2691 */ 2692 *locked_tcb = *stcb; 2693 2694 /* 2695 * We must also increment the inp ref count 2696 * since the ref_count flags was set when we 2697 * did not find the TCB, now we found it 2698 * which reduces the refcount.. we must 2699 * raise it back out to balance it all :-) 2700 */ 2701 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2702 if ((*stcb)->sctp_ep != l_inp) { 2703 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2704 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2705 } 2706 } 2707 } 2708 } 2709 2710 cookie_len -= SCTP_SIGNATURE_SIZE; 2711 if (*stcb == NULL) { 2712 /* this is the "normal" case... get a new TCB */ 2713 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2714 cookie, cookie_len, *inp_p, 2715 netp, to, ¬ification, 2716 auth_skipped, auth_offset, auth_len, 2717 mflowtype, mflowid, 2718 vrf_id, port); 2719 } else { 2720 /* this is abnormal... cookie-echo on existing TCB */ 2721 had_a_existing_tcb = 1; 2722 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2723 src, dst, sh, 2724 cookie, cookie_len, *inp_p, *stcb, netp, to, 2725 ¬ification, auth_skipped, auth_offset, auth_len, 2726 mflowtype, mflowid, 2727 vrf_id, port); 2728 } 2729 2730 if (*stcb == NULL) { 2731 /* still no TCB... must be bad cookie-echo */ 2732 return (NULL); 2733 } 2734 if (*netp != NULL) { 2735 (*netp)->flowtype = mflowtype; 2736 (*netp)->flowid = mflowid; 2737 } 2738 /* 2739 * Ok, we built an association so confirm the address we sent the 2740 * INIT-ACK to. 2741 */ 2742 netl = sctp_findnet(*stcb, to); 2743 /* 2744 * This code should in theory NOT run but 2745 */ 2746 if (netl == NULL) { 2747 /* TSNH! Huh, why do I need to add this address here? */ 2748 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2749 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2750 return (NULL); 2751 } 2752 netl = sctp_findnet(*stcb, to); 2753 } 2754 if (netl) { 2755 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2756 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2757 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2758 netl); 2759 send_int_conf = 1; 2760 } 2761 } 2762 sctp_start_net_timers(*stcb); 2763 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2764 if (!had_a_existing_tcb || 2765 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2766 /* 2767 * If we have a NEW cookie or the connect never 2768 * reached the connected state during collision we 2769 * must do the TCP accept thing. 2770 */ 2771 struct socket *so, *oso; 2772 struct sctp_inpcb *inp; 2773 2774 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2775 /* 2776 * For a restart we will keep the same 2777 * socket, no need to do anything. I THINK!! 2778 */ 2779 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2780 if (send_int_conf) { 2781 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2782 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2783 } 2784 return (m); 2785 } 2786 oso = (*inp_p)->sctp_socket; 2787 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2788 SCTP_TCB_UNLOCK((*stcb)); 2789 CURVNET_SET(oso->so_vnet); 2790 so = sonewconn(oso, 0 2791 ); 2792 CURVNET_RESTORE(); 2793 SCTP_TCB_LOCK((*stcb)); 2794 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2795 2796 if (so == NULL) { 2797 struct mbuf *op_err; 2798 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2799 struct socket *pcb_so; 2800 #endif 2801 /* Too many sockets */ 2802 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2803 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2804 sctp_abort_association(*inp_p, NULL, m, iphlen, 2805 src, dst, sh, op_err, 2806 mflowtype, mflowid, 2807 vrf_id, port); 2808 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2809 pcb_so = SCTP_INP_SO(*inp_p); 2810 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2811 SCTP_TCB_UNLOCK((*stcb)); 2812 SCTP_SOCKET_LOCK(pcb_so, 1); 2813 SCTP_TCB_LOCK((*stcb)); 2814 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2815 #endif 2816 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2817 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2819 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2820 #endif 2821 return (NULL); 2822 } 2823 inp = (struct sctp_inpcb *)so->so_pcb; 2824 SCTP_INP_INCR_REF(inp); 2825 /* 2826 * We add the unbound flag here so that if we get an 2827 * soabort() before we get the move_pcb done, we 2828 * will properly cleanup. 2829 */ 2830 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2831 SCTP_PCB_FLAGS_CONNECTED | 2832 SCTP_PCB_FLAGS_IN_TCPPOOL | 2833 SCTP_PCB_FLAGS_UNBOUND | 2834 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2835 SCTP_PCB_FLAGS_DONT_WAKE); 2836 inp->sctp_features = (*inp_p)->sctp_features; 2837 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2838 inp->sctp_socket = so; 2839 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2840 inp->max_cwnd = (*inp_p)->max_cwnd; 2841 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2842 inp->ecn_supported = (*inp_p)->ecn_supported; 2843 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2844 inp->auth_supported = (*inp_p)->auth_supported; 2845 inp->asconf_supported = (*inp_p)->asconf_supported; 2846 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2847 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2848 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2849 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2850 inp->sctp_context = (*inp_p)->sctp_context; 2851 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2852 inp->fibnum = (*inp_p)->fibnum; 2853 inp->inp_starting_point_for_iterator = NULL; 2854 /* 2855 * copy in the authentication parameters from the 2856 * original endpoint 2857 */ 2858 if (inp->sctp_ep.local_hmacs) 2859 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2860 inp->sctp_ep.local_hmacs = 2861 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2862 if (inp->sctp_ep.local_auth_chunks) 2863 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2864 inp->sctp_ep.local_auth_chunks = 2865 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2866 2867 /* 2868 * Now we must move it from one hash table to 2869 * another and get the tcb in the right place. 2870 */ 2871 2872 /* 2873 * This is where the one-2-one socket is put into 2874 * the accept state waiting for the accept! 2875 */ 2876 if (*stcb) { 2877 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2878 } 2879 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2880 2881 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2882 SCTP_TCB_UNLOCK((*stcb)); 2883 2884 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2885 0); 2886 SCTP_TCB_LOCK((*stcb)); 2887 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2888 2889 2890 /* 2891 * now we must check to see if we were aborted while 2892 * the move was going on and the lock/unlock 2893 * happened. 2894 */ 2895 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2896 /* 2897 * yep it was, we leave the assoc attached 2898 * to the socket since the sctp_inpcb_free() 2899 * call will send an abort for us. 2900 */ 2901 SCTP_INP_DECR_REF(inp); 2902 return (NULL); 2903 } 2904 SCTP_INP_DECR_REF(inp); 2905 /* Switch over to the new guy */ 2906 *inp_p = inp; 2907 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2908 if (send_int_conf) { 2909 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2910 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2911 } 2912 2913 /* 2914 * Pull it from the incomplete queue and wake the 2915 * guy 2916 */ 2917 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2918 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2919 SCTP_TCB_UNLOCK((*stcb)); 2920 SCTP_SOCKET_LOCK(so, 1); 2921 #endif 2922 soisconnected(so); 2923 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2924 SCTP_TCB_LOCK((*stcb)); 2925 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2926 SCTP_SOCKET_UNLOCK(so, 1); 2927 #endif 2928 return (m); 2929 } 2930 } 2931 if (notification) { 2932 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2933 } 2934 if (send_int_conf) { 2935 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2936 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2937 } 2938 return (m); 2939 } 2940 2941 static void 2942 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2943 struct sctp_tcb *stcb, struct sctp_nets *net) 2944 { 2945 /* cp must not be used, others call this without a c-ack :-) */ 2946 struct sctp_association *asoc; 2947 2948 SCTPDBG(SCTP_DEBUG_INPUT2, 2949 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2950 if ((stcb == NULL) || (net == NULL)) { 2951 return; 2952 } 2953 2954 asoc = &stcb->asoc; 2955 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2956 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2957 asoc->overall_error_count, 2958 0, 2959 SCTP_FROM_SCTP_INPUT, 2960 __LINE__); 2961 } 2962 asoc->overall_error_count = 0; 2963 sctp_stop_all_cookie_timers(stcb); 2964 /* process according to association state */ 2965 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2966 /* state change only needed when I am in right state */ 2967 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2968 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2969 sctp_start_net_timers(stcb); 2970 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2971 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2972 stcb->sctp_ep, stcb, asoc->primary_destination); 2973 2974 } 2975 /* update RTO */ 2976 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2977 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2978 if (asoc->overall_error_count == 0) { 2979 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2980 &asoc->time_entered, 2981 SCTP_RTT_FROM_NON_DATA); 2982 } 2983 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2984 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2985 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2986 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2987 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2988 struct socket *so; 2989 2990 #endif 2991 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2992 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2993 so = SCTP_INP_SO(stcb->sctp_ep); 2994 atomic_add_int(&stcb->asoc.refcnt, 1); 2995 SCTP_TCB_UNLOCK(stcb); 2996 SCTP_SOCKET_LOCK(so, 1); 2997 SCTP_TCB_LOCK(stcb); 2998 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2999 #endif 3000 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3001 soisconnected(stcb->sctp_socket); 3002 } 3003 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3004 SCTP_SOCKET_UNLOCK(so, 1); 3005 #endif 3006 } 3007 /* 3008 * since we did not send a HB make sure we don't double 3009 * things 3010 */ 3011 net->hb_responded = 1; 3012 3013 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3014 /* 3015 * We don't need to do the asconf thing, nor hb or 3016 * autoclose if the socket is closed. 3017 */ 3018 goto closed_socket; 3019 } 3020 3021 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3022 stcb, net); 3023 3024 3025 if (stcb->asoc.sctp_autoclose_ticks && 3026 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3027 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3028 stcb->sctp_ep, stcb, NULL); 3029 } 3030 /* 3031 * send ASCONF if parameters are pending and ASCONFs are 3032 * allowed (eg. addresses changed when init/cookie echo were 3033 * in flight) 3034 */ 3035 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3036 (stcb->asoc.asconf_supported == 1) && 3037 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3038 #ifdef SCTP_TIMER_BASED_ASCONF 3039 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3040 stcb->sctp_ep, stcb, 3041 stcb->asoc.primary_destination); 3042 #else 3043 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3044 SCTP_ADDR_NOT_LOCKED); 3045 #endif 3046 } 3047 } 3048 closed_socket: 3049 /* Toss the cookie if I can */ 3050 sctp_toss_old_cookies(stcb, asoc); 3051 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3052 /* Restart the timer if we have pending data */ 3053 struct sctp_tmit_chunk *chk; 3054 3055 chk = TAILQ_FIRST(&asoc->sent_queue); 3056 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3057 } 3058 } 3059 3060 static void 3061 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3062 struct sctp_tcb *stcb) 3063 { 3064 struct sctp_nets *net; 3065 struct sctp_tmit_chunk *lchk; 3066 struct sctp_ecne_chunk bkup; 3067 uint8_t override_bit; 3068 uint32_t tsn, window_data_tsn; 3069 int len; 3070 unsigned int pkt_cnt; 3071 3072 len = ntohs(cp->ch.chunk_length); 3073 if ((len != sizeof(struct sctp_ecne_chunk)) && 3074 (len != sizeof(struct old_sctp_ecne_chunk))) { 3075 return; 3076 } 3077 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3078 /* Its the old format */ 3079 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3080 bkup.num_pkts_since_cwr = htonl(1); 3081 cp = &bkup; 3082 } 3083 SCTP_STAT_INCR(sctps_recvecne); 3084 tsn = ntohl(cp->tsn); 3085 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3086 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3087 if (lchk == NULL) { 3088 window_data_tsn = stcb->asoc.sending_seq - 1; 3089 } else { 3090 window_data_tsn = lchk->rec.data.tsn; 3091 } 3092 3093 /* Find where it was sent to if possible. */ 3094 net = NULL; 3095 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3096 if (lchk->rec.data.tsn == tsn) { 3097 net = lchk->whoTo; 3098 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3099 break; 3100 } 3101 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3102 break; 3103 } 3104 } 3105 if (net == NULL) { 3106 /* 3107 * What to do. A previous send of a CWR was possibly lost. 3108 * See how old it is, we may have it marked on the actual 3109 * net. 3110 */ 3111 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3112 if (tsn == net->last_cwr_tsn) { 3113 /* Found him, send it off */ 3114 break; 3115 } 3116 } 3117 if (net == NULL) { 3118 /* 3119 * If we reach here, we need to send a special CWR 3120 * that says hey, we did this a long time ago and 3121 * you lost the response. 3122 */ 3123 net = TAILQ_FIRST(&stcb->asoc.nets); 3124 if (net == NULL) { 3125 /* TSNH */ 3126 return; 3127 } 3128 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3129 } else { 3130 override_bit = 0; 3131 } 3132 } else { 3133 override_bit = 0; 3134 } 3135 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3136 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3137 /* 3138 * JRS - Use the congestion control given in the pluggable 3139 * CC module 3140 */ 3141 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3142 /* 3143 * We reduce once every RTT. So we will only lower cwnd at 3144 * the next sending seq i.e. the window_data_tsn 3145 */ 3146 net->cwr_window_tsn = window_data_tsn; 3147 net->ecn_ce_pkt_cnt += pkt_cnt; 3148 net->lost_cnt = pkt_cnt; 3149 net->last_cwr_tsn = tsn; 3150 } else { 3151 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3152 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3153 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3154 /* 3155 * Another loss in the same window update how many 3156 * marks/packets lost we have had. 3157 */ 3158 int cnt = 1; 3159 3160 if (pkt_cnt > net->lost_cnt) { 3161 /* Should be the case */ 3162 cnt = (pkt_cnt - net->lost_cnt); 3163 net->ecn_ce_pkt_cnt += cnt; 3164 } 3165 net->lost_cnt = pkt_cnt; 3166 net->last_cwr_tsn = tsn; 3167 /* 3168 * Most CC functions will ignore this call, since we 3169 * are in-window yet of the initial CE the peer saw. 3170 */ 3171 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3172 } 3173 } 3174 /* 3175 * We always send a CWR this way if our previous one was lost our 3176 * peer will get an update, or if it is not time again to reduce we 3177 * still get the cwr to the peer. Note we set the override when we 3178 * could not find the TSN on the chunk or the destination network. 3179 */ 3180 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3181 } 3182 3183 static void 3184 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3185 { 3186 /* 3187 * Here we get a CWR from the peer. We must look in the outqueue and 3188 * make sure that we have a covered ECNE in the control chunk part. 3189 * If so remove it. 3190 */ 3191 struct sctp_tmit_chunk *chk, *nchk; 3192 struct sctp_ecne_chunk *ecne; 3193 int override; 3194 uint32_t cwr_tsn; 3195 3196 cwr_tsn = ntohl(cp->tsn); 3197 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3198 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3199 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3200 continue; 3201 } 3202 if ((override == 0) && (chk->whoTo != net)) { 3203 /* Must be from the right src unless override is set */ 3204 continue; 3205 } 3206 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3207 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3208 /* this covers this ECNE, we can remove it */ 3209 stcb->asoc.ecn_echo_cnt_onq--; 3210 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3211 sctp_next); 3212 stcb->asoc.ctrl_queue_cnt--; 3213 sctp_m_freem(chk->data); 3214 chk->data = NULL; 3215 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3216 if (override == 0) { 3217 break; 3218 } 3219 } 3220 } 3221 } 3222 3223 static void 3224 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3225 struct sctp_tcb *stcb, struct sctp_nets *net) 3226 { 3227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3228 struct socket *so; 3229 #endif 3230 3231 SCTPDBG(SCTP_DEBUG_INPUT2, 3232 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3233 if (stcb == NULL) 3234 return; 3235 3236 /* process according to association state */ 3237 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3238 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3239 SCTPDBG(SCTP_DEBUG_INPUT2, 3240 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3241 SCTP_TCB_UNLOCK(stcb); 3242 return; 3243 } 3244 /* notify upper layer protocol */ 3245 if (stcb->sctp_socket) { 3246 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3247 } 3248 #ifdef INVARIANTS 3249 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3250 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3251 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3252 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3253 } 3254 #endif 3255 /* stop the timer */ 3256 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3257 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3258 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3259 /* free the TCB */ 3260 SCTPDBG(SCTP_DEBUG_INPUT2, 3261 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3262 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3263 so = SCTP_INP_SO(stcb->sctp_ep); 3264 atomic_add_int(&stcb->asoc.refcnt, 1); 3265 SCTP_TCB_UNLOCK(stcb); 3266 SCTP_SOCKET_LOCK(so, 1); 3267 SCTP_TCB_LOCK(stcb); 3268 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3269 #endif 3270 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3271 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3272 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3273 SCTP_SOCKET_UNLOCK(so, 1); 3274 #endif 3275 return; 3276 } 3277 3278 static int 3279 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3280 struct sctp_nets *net, uint8_t flg) 3281 { 3282 switch (desc->chunk_type) { 3283 case SCTP_DATA: 3284 /* find the tsn to resend (possibly */ 3285 { 3286 uint32_t tsn; 3287 struct sctp_tmit_chunk *tp1; 3288 3289 tsn = ntohl(desc->tsn_ifany); 3290 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3291 if (tp1->rec.data.tsn == tsn) { 3292 /* found it */ 3293 break; 3294 } 3295 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3296 /* not found */ 3297 tp1 = NULL; 3298 break; 3299 } 3300 } 3301 if (tp1 == NULL) { 3302 /* 3303 * Do it the other way , aka without paying 3304 * attention to queue seq order. 3305 */ 3306 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3307 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3308 if (tp1->rec.data.tsn == tsn) { 3309 /* found it */ 3310 break; 3311 } 3312 } 3313 } 3314 if (tp1 == NULL) { 3315 SCTP_STAT_INCR(sctps_pdrptsnnf); 3316 } 3317 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3318 uint8_t *ddp; 3319 3320 if (((flg & SCTP_BADCRC) == 0) && 3321 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3322 return (0); 3323 } 3324 if ((stcb->asoc.peers_rwnd == 0) && 3325 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3326 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3327 return (0); 3328 } 3329 if (stcb->asoc.peers_rwnd == 0 && 3330 (flg & SCTP_FROM_MIDDLE_BOX)) { 3331 SCTP_STAT_INCR(sctps_pdrpdizrw); 3332 return (0); 3333 } 3334 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3335 sizeof(struct sctp_data_chunk)); 3336 { 3337 unsigned int iii; 3338 3339 for (iii = 0; iii < sizeof(desc->data_bytes); 3340 iii++) { 3341 if (ddp[iii] != desc->data_bytes[iii]) { 3342 SCTP_STAT_INCR(sctps_pdrpbadd); 3343 return (-1); 3344 } 3345 } 3346 } 3347 3348 if (tp1->do_rtt) { 3349 /* 3350 * this guy had a RTO calculation 3351 * pending on it, cancel it 3352 */ 3353 if (tp1->whoTo->rto_needed == 0) { 3354 tp1->whoTo->rto_needed = 1; 3355 } 3356 tp1->do_rtt = 0; 3357 } 3358 SCTP_STAT_INCR(sctps_pdrpmark); 3359 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3360 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3361 /* 3362 * mark it as if we were doing a FR, since 3363 * we will be getting gap ack reports behind 3364 * the info from the router. 3365 */ 3366 tp1->rec.data.doing_fast_retransmit = 1; 3367 /* 3368 * mark the tsn with what sequences can 3369 * cause a new FR. 3370 */ 3371 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3372 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3373 } else { 3374 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3375 } 3376 3377 /* restart the timer */ 3378 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3379 stcb, tp1->whoTo, 3380 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3381 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3382 stcb, tp1->whoTo); 3383 3384 /* fix counts and things */ 3385 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3386 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3387 tp1->whoTo->flight_size, 3388 tp1->book_size, 3389 (uint32_t)(uintptr_t)stcb, 3390 tp1->rec.data.tsn); 3391 } 3392 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3393 sctp_flight_size_decrease(tp1); 3394 sctp_total_flight_decrease(stcb, tp1); 3395 } 3396 tp1->sent = SCTP_DATAGRAM_RESEND; 3397 } { 3398 /* audit code */ 3399 unsigned int audit; 3400 3401 audit = 0; 3402 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3403 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3404 audit++; 3405 } 3406 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3407 sctp_next) { 3408 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3409 audit++; 3410 } 3411 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3412 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3413 audit, stcb->asoc.sent_queue_retran_cnt); 3414 #ifndef SCTP_AUDITING_ENABLED 3415 stcb->asoc.sent_queue_retran_cnt = audit; 3416 #endif 3417 } 3418 } 3419 } 3420 break; 3421 case SCTP_ASCONF: 3422 { 3423 struct sctp_tmit_chunk *asconf; 3424 3425 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3426 sctp_next) { 3427 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3428 break; 3429 } 3430 } 3431 if (asconf) { 3432 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3433 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3434 asconf->sent = SCTP_DATAGRAM_RESEND; 3435 asconf->snd_count--; 3436 } 3437 } 3438 break; 3439 case SCTP_INITIATION: 3440 /* resend the INIT */ 3441 stcb->asoc.dropped_special_cnt++; 3442 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3443 /* 3444 * If we can get it in, in a few attempts we do 3445 * this, otherwise we let the timer fire. 3446 */ 3447 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3448 stcb, net, 3449 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3450 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3451 } 3452 break; 3453 case SCTP_SELECTIVE_ACK: 3454 case SCTP_NR_SELECTIVE_ACK: 3455 /* resend the sack */ 3456 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3457 break; 3458 case SCTP_HEARTBEAT_REQUEST: 3459 /* resend a demand HB */ 3460 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3461 /* 3462 * Only retransmit if we KNOW we wont destroy the 3463 * tcb 3464 */ 3465 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3466 } 3467 break; 3468 case SCTP_SHUTDOWN: 3469 sctp_send_shutdown(stcb, net); 3470 break; 3471 case SCTP_SHUTDOWN_ACK: 3472 sctp_send_shutdown_ack(stcb, net); 3473 break; 3474 case SCTP_COOKIE_ECHO: 3475 { 3476 struct sctp_tmit_chunk *cookie; 3477 3478 cookie = NULL; 3479 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3480 sctp_next) { 3481 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3482 break; 3483 } 3484 } 3485 if (cookie) { 3486 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3487 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3488 cookie->sent = SCTP_DATAGRAM_RESEND; 3489 sctp_stop_all_cookie_timers(stcb); 3490 } 3491 } 3492 break; 3493 case SCTP_COOKIE_ACK: 3494 sctp_send_cookie_ack(stcb); 3495 break; 3496 case SCTP_ASCONF_ACK: 3497 /* resend last asconf ack */ 3498 sctp_send_asconf_ack(stcb); 3499 break; 3500 case SCTP_IFORWARD_CUM_TSN: 3501 case SCTP_FORWARD_CUM_TSN: 3502 send_forward_tsn(stcb, &stcb->asoc); 3503 break; 3504 /* can't do anything with these */ 3505 case SCTP_PACKET_DROPPED: 3506 case SCTP_INITIATION_ACK: /* this should not happen */ 3507 case SCTP_HEARTBEAT_ACK: 3508 case SCTP_ABORT_ASSOCIATION: 3509 case SCTP_OPERATION_ERROR: 3510 case SCTP_SHUTDOWN_COMPLETE: 3511 case SCTP_ECN_ECHO: 3512 case SCTP_ECN_CWR: 3513 default: 3514 break; 3515 } 3516 return (0); 3517 } 3518 3519 void 3520 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3521 { 3522 uint32_t i; 3523 uint16_t temp; 3524 3525 /* 3526 * We set things to 0xffffffff since this is the last delivered 3527 * sequence and we will be sending in 0 after the reset. 3528 */ 3529 3530 if (number_entries) { 3531 for (i = 0; i < number_entries; i++) { 3532 temp = ntohs(list[i]); 3533 if (temp >= stcb->asoc.streamincnt) { 3534 continue; 3535 } 3536 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3537 } 3538 } else { 3539 list = NULL; 3540 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3541 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3542 } 3543 } 3544 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3545 } 3546 3547 static void 3548 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3549 { 3550 uint32_t i; 3551 uint16_t temp; 3552 3553 if (number_entries > 0) { 3554 for (i = 0; i < number_entries; i++) { 3555 temp = ntohs(list[i]); 3556 if (temp >= stcb->asoc.streamoutcnt) { 3557 /* no such stream */ 3558 continue; 3559 } 3560 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3561 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3562 } 3563 } else { 3564 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3565 stcb->asoc.strmout[i].next_mid_ordered = 0; 3566 stcb->asoc.strmout[i].next_mid_unordered = 0; 3567 } 3568 } 3569 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3570 } 3571 3572 static void 3573 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3574 { 3575 uint32_t i; 3576 uint16_t temp; 3577 3578 if (number_entries > 0) { 3579 for (i = 0; i < number_entries; i++) { 3580 temp = ntohs(list[i]); 3581 if (temp >= stcb->asoc.streamoutcnt) { 3582 /* no such stream */ 3583 continue; 3584 } 3585 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3586 } 3587 } else { 3588 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3589 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3590 } 3591 } 3592 } 3593 3594 3595 struct sctp_stream_reset_request * 3596 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3597 { 3598 struct sctp_association *asoc; 3599 struct sctp_chunkhdr *ch; 3600 struct sctp_stream_reset_request *r; 3601 struct sctp_tmit_chunk *chk; 3602 int len, clen; 3603 3604 asoc = &stcb->asoc; 3605 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3606 asoc->stream_reset_outstanding = 0; 3607 return (NULL); 3608 } 3609 if (stcb->asoc.str_reset == NULL) { 3610 asoc->stream_reset_outstanding = 0; 3611 return (NULL); 3612 } 3613 chk = stcb->asoc.str_reset; 3614 if (chk->data == NULL) { 3615 return (NULL); 3616 } 3617 if (bchk) { 3618 /* he wants a copy of the chk pointer */ 3619 *bchk = chk; 3620 } 3621 clen = chk->send_size; 3622 ch = mtod(chk->data, struct sctp_chunkhdr *); 3623 r = (struct sctp_stream_reset_request *)(ch + 1); 3624 if (ntohl(r->request_seq) == seq) { 3625 /* found it */ 3626 return (r); 3627 } 3628 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3629 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3630 /* move to the next one, there can only be a max of two */ 3631 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3632 if (ntohl(r->request_seq) == seq) { 3633 return (r); 3634 } 3635 } 3636 /* that seq is not here */ 3637 return (NULL); 3638 } 3639 3640 static void 3641 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3642 { 3643 struct sctp_association *asoc; 3644 struct sctp_tmit_chunk *chk; 3645 3646 asoc = &stcb->asoc; 3647 chk = asoc->str_reset; 3648 if (chk == NULL) { 3649 return; 3650 } 3651 asoc->str_reset = NULL; 3652 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3653 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3654 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3655 asoc->ctrl_queue_cnt--; 3656 if (chk->data) { 3657 sctp_m_freem(chk->data); 3658 chk->data = NULL; 3659 } 3660 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3661 } 3662 3663 3664 static int 3665 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3666 uint32_t seq, uint32_t action, 3667 struct sctp_stream_reset_response *respin) 3668 { 3669 uint16_t type; 3670 int lparam_len; 3671 struct sctp_association *asoc = &stcb->asoc; 3672 struct sctp_tmit_chunk *chk; 3673 struct sctp_stream_reset_request *req_param; 3674 struct sctp_stream_reset_out_request *req_out_param; 3675 struct sctp_stream_reset_in_request *req_in_param; 3676 uint32_t number_entries; 3677 3678 if (asoc->stream_reset_outstanding == 0) { 3679 /* duplicate */ 3680 return (0); 3681 } 3682 if (seq == stcb->asoc.str_reset_seq_out) { 3683 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3684 if (req_param != NULL) { 3685 stcb->asoc.str_reset_seq_out++; 3686 type = ntohs(req_param->ph.param_type); 3687 lparam_len = ntohs(req_param->ph.param_length); 3688 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3689 int no_clear = 0; 3690 3691 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3692 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3693 asoc->stream_reset_out_is_outstanding = 0; 3694 if (asoc->stream_reset_outstanding) 3695 asoc->stream_reset_outstanding--; 3696 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3697 /* do it */ 3698 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3699 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3700 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3701 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3702 /* 3703 * Set it up so we don't stop 3704 * retransmitting 3705 */ 3706 asoc->stream_reset_outstanding++; 3707 stcb->asoc.str_reset_seq_out--; 3708 asoc->stream_reset_out_is_outstanding = 1; 3709 no_clear = 1; 3710 } else { 3711 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3712 } 3713 if (no_clear == 0) { 3714 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3715 } 3716 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3717 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3718 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3719 if (asoc->stream_reset_outstanding) 3720 asoc->stream_reset_outstanding--; 3721 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3722 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3723 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3724 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3725 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3726 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3727 } 3728 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3729 /* Ok we now may have more streams */ 3730 int num_stream; 3731 3732 num_stream = stcb->asoc.strm_pending_add_size; 3733 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3734 /* TSNH */ 3735 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3736 } 3737 stcb->asoc.strm_pending_add_size = 0; 3738 if (asoc->stream_reset_outstanding) 3739 asoc->stream_reset_outstanding--; 3740 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3741 /* Put the new streams into effect */ 3742 int i; 3743 3744 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3745 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3746 } 3747 asoc->streamoutcnt += num_stream; 3748 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3749 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3750 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3751 SCTP_STREAM_CHANGE_DENIED); 3752 } else { 3753 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3754 SCTP_STREAM_CHANGE_FAILED); 3755 } 3756 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3757 if (asoc->stream_reset_outstanding) 3758 asoc->stream_reset_outstanding--; 3759 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3760 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3761 SCTP_STREAM_CHANGE_DENIED); 3762 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3763 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3764 SCTP_STREAM_CHANGE_FAILED); 3765 } 3766 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3767 /** 3768 * a) Adopt the new in tsn. 3769 * b) reset the map 3770 * c) Adopt the new out-tsn 3771 */ 3772 struct sctp_stream_reset_response_tsn *resp; 3773 struct sctp_forward_tsn_chunk fwdtsn; 3774 int abort_flag = 0; 3775 3776 if (respin == NULL) { 3777 /* huh ? */ 3778 return (0); 3779 } 3780 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3781 return (0); 3782 } 3783 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3784 resp = (struct sctp_stream_reset_response_tsn *)respin; 3785 asoc->stream_reset_outstanding--; 3786 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3787 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3788 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3789 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3790 if (abort_flag) { 3791 return (1); 3792 } 3793 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3794 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3795 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3796 } 3797 3798 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3799 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3800 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3801 3802 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3803 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3804 3805 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3806 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3807 3808 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3809 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3810 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3811 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3812 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3813 SCTP_ASSOC_RESET_DENIED); 3814 } else { 3815 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3816 SCTP_ASSOC_RESET_FAILED); 3817 } 3818 } 3819 /* get rid of the request and get the request flags */ 3820 if (asoc->stream_reset_outstanding == 0) { 3821 sctp_clean_up_stream_reset(stcb); 3822 } 3823 } 3824 } 3825 if (asoc->stream_reset_outstanding == 0) { 3826 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3827 } 3828 return (0); 3829 } 3830 3831 static void 3832 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3833 struct sctp_tmit_chunk *chk, 3834 struct sctp_stream_reset_in_request *req, int trunc) 3835 { 3836 uint32_t seq; 3837 int len, i; 3838 int number_entries; 3839 uint16_t temp; 3840 3841 /* 3842 * peer wants me to send a str-reset to him for my outgoing seq's if 3843 * seq_in is right. 3844 */ 3845 struct sctp_association *asoc = &stcb->asoc; 3846 3847 seq = ntohl(req->request_seq); 3848 if (asoc->str_reset_seq_in == seq) { 3849 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3850 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3851 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3852 } else if (trunc) { 3853 /* Can't do it, since they exceeded our buffer size */ 3854 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3855 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3856 len = ntohs(req->ph.param_length); 3857 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3858 if (number_entries) { 3859 for (i = 0; i < number_entries; i++) { 3860 temp = ntohs(req->list_of_streams[i]); 3861 if (temp >= stcb->asoc.streamoutcnt) { 3862 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3863 goto bad_boy; 3864 } 3865 req->list_of_streams[i] = temp; 3866 } 3867 for (i = 0; i < number_entries; i++) { 3868 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3869 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3870 } 3871 } 3872 } else { 3873 /* Its all */ 3874 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3875 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3876 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3877 } 3878 } 3879 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3880 } else { 3881 /* Can't do it, since we have sent one out */ 3882 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3883 } 3884 bad_boy: 3885 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3886 asoc->str_reset_seq_in++; 3887 } else if (asoc->str_reset_seq_in - 1 == seq) { 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 } else if (asoc->str_reset_seq_in - 2 == seq) { 3890 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3891 } else { 3892 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3893 } 3894 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3895 } 3896 3897 static int 3898 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3899 struct sctp_tmit_chunk *chk, 3900 struct sctp_stream_reset_tsn_request *req) 3901 { 3902 /* reset all in and out and update the tsn */ 3903 /* 3904 * A) reset my str-seq's on in and out. B) Select a receive next, 3905 * and set cum-ack to it. Also process this selected number as a 3906 * fwd-tsn as well. C) set in the response my next sending seq. 3907 */ 3908 struct sctp_forward_tsn_chunk fwdtsn; 3909 struct sctp_association *asoc = &stcb->asoc; 3910 int abort_flag = 0; 3911 uint32_t seq; 3912 3913 seq = ntohl(req->request_seq); 3914 if (asoc->str_reset_seq_in == seq) { 3915 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3916 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3917 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3918 } else { 3919 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3920 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3921 fwdtsn.ch.chunk_flags = 0; 3922 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3923 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3924 if (abort_flag) { 3925 return (1); 3926 } 3927 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3928 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3929 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3930 } 3931 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3932 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3933 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3934 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3935 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3936 atomic_add_int(&asoc->sending_seq, 1); 3937 /* save off historical data for retrans */ 3938 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3939 asoc->last_sending_seq[0] = asoc->sending_seq; 3940 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3941 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3942 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3943 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3944 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3945 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3946 } 3947 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3948 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3949 asoc->str_reset_seq_in++; 3950 } else if (asoc->str_reset_seq_in - 1 == seq) { 3951 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3952 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3953 } else if (asoc->str_reset_seq_in - 2 == seq) { 3954 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3955 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3956 } else { 3957 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3958 } 3959 return (0); 3960 } 3961 3962 static void 3963 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3964 struct sctp_tmit_chunk *chk, 3965 struct sctp_stream_reset_out_request *req, int trunc) 3966 { 3967 uint32_t seq, tsn; 3968 int number_entries, len; 3969 struct sctp_association *asoc = &stcb->asoc; 3970 3971 seq = ntohl(req->request_seq); 3972 3973 /* now if its not a duplicate we process it */ 3974 if (asoc->str_reset_seq_in == seq) { 3975 len = ntohs(req->ph.param_length); 3976 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3977 /* 3978 * the sender is resetting, handle the list issue.. we must 3979 * a) verify if we can do the reset, if so no problem b) If 3980 * we can't do the reset we must copy the request. c) queue 3981 * it, and setup the data in processor to trigger it off 3982 * when needed and dequeue all the queued data. 3983 */ 3984 tsn = ntohl(req->send_reset_at_tsn); 3985 3986 /* move the reset action back one */ 3987 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3988 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3989 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3990 } else if (trunc) { 3991 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3992 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3993 /* we can do it now */ 3994 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3995 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3996 } else { 3997 /* 3998 * we must queue it up and thus wait for the TSN's 3999 * to arrive that are at or before tsn 4000 */ 4001 struct sctp_stream_reset_list *liste; 4002 int siz; 4003 4004 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4005 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4006 siz, SCTP_M_STRESET); 4007 if (liste == NULL) { 4008 /* gak out of memory */ 4009 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4010 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4011 return; 4012 } 4013 liste->seq = seq; 4014 liste->tsn = tsn; 4015 liste->number_entries = number_entries; 4016 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4017 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4018 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4019 } 4020 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4021 asoc->str_reset_seq_in++; 4022 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4023 /* 4024 * one seq back, just echo back last action since my 4025 * response was lost. 4026 */ 4027 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4028 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4029 /* 4030 * two seq back, just echo back last action since my 4031 * response was lost. 4032 */ 4033 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4034 } else { 4035 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4036 } 4037 } 4038 4039 static void 4040 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4041 struct sctp_stream_reset_add_strm *str_add) 4042 { 4043 /* 4044 * Peer is requesting to add more streams. If its within our 4045 * max-streams we will allow it. 4046 */ 4047 uint32_t num_stream, i; 4048 uint32_t seq; 4049 struct sctp_association *asoc = &stcb->asoc; 4050 struct sctp_queued_to_read *ctl, *nctl; 4051 4052 /* Get the number. */ 4053 seq = ntohl(str_add->request_seq); 4054 num_stream = ntohs(str_add->number_of_streams); 4055 /* Now what would be the new total? */ 4056 if (asoc->str_reset_seq_in == seq) { 4057 num_stream += stcb->asoc.streamincnt; 4058 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4059 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4060 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4061 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4062 (num_stream > 0xffff)) { 4063 /* We must reject it they ask for to many */ 4064 denied: 4065 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4066 } else { 4067 /* Ok, we can do that :-) */ 4068 struct sctp_stream_in *oldstrm; 4069 4070 /* save off the old */ 4071 oldstrm = stcb->asoc.strmin; 4072 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4073 (num_stream * sizeof(struct sctp_stream_in)), 4074 SCTP_M_STRMI); 4075 if (stcb->asoc.strmin == NULL) { 4076 stcb->asoc.strmin = oldstrm; 4077 goto denied; 4078 } 4079 /* copy off the old data */ 4080 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4081 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4082 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4083 stcb->asoc.strmin[i].sid = i; 4084 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4085 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4086 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4087 /* now anything on those queues? */ 4088 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4089 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4090 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4091 } 4092 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4093 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4094 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4095 } 4096 } 4097 /* Init the new streams */ 4098 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4099 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4100 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4101 stcb->asoc.strmin[i].sid = i; 4102 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4103 stcb->asoc.strmin[i].pd_api_started = 0; 4104 stcb->asoc.strmin[i].delivery_started = 0; 4105 } 4106 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4107 /* update the size */ 4108 stcb->asoc.streamincnt = num_stream; 4109 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4110 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4111 } 4112 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4113 asoc->str_reset_seq_in++; 4114 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4115 /* 4116 * one seq back, just echo back last action since my 4117 * response was lost. 4118 */ 4119 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4120 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4121 /* 4122 * two seq back, just echo back last action since my 4123 * response was lost. 4124 */ 4125 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4126 } else { 4127 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4128 4129 } 4130 } 4131 4132 static void 4133 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4134 struct sctp_stream_reset_add_strm *str_add) 4135 { 4136 /* 4137 * Peer is requesting to add more streams. If its within our 4138 * max-streams we will allow it. 4139 */ 4140 uint16_t num_stream; 4141 uint32_t seq; 4142 struct sctp_association *asoc = &stcb->asoc; 4143 4144 /* Get the number. */ 4145 seq = ntohl(str_add->request_seq); 4146 num_stream = ntohs(str_add->number_of_streams); 4147 /* Now what would be the new total? */ 4148 if (asoc->str_reset_seq_in == seq) { 4149 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4150 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4151 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4152 } else if (stcb->asoc.stream_reset_outstanding) { 4153 /* We must reject it we have something pending */ 4154 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4155 } else { 4156 /* Ok, we can do that :-) */ 4157 int mychk; 4158 4159 mychk = stcb->asoc.streamoutcnt; 4160 mychk += num_stream; 4161 if (mychk < 0x10000) { 4162 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4163 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4164 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4165 } 4166 } else { 4167 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4168 } 4169 } 4170 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4171 asoc->str_reset_seq_in++; 4172 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4173 /* 4174 * one seq back, just echo back last action since my 4175 * response was lost. 4176 */ 4177 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4178 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4179 /* 4180 * two seq back, just echo back last action since my 4181 * response was lost. 4182 */ 4183 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4184 } else { 4185 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4186 } 4187 } 4188 4189 #ifdef __GNUC__ 4190 __attribute__((noinline)) 4191 #endif 4192 static int 4193 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4194 struct sctp_chunkhdr *ch_req) 4195 { 4196 uint16_t remaining_length, param_len, ptype; 4197 struct sctp_paramhdr pstore; 4198 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4199 uint32_t seq = 0; 4200 int num_req = 0; 4201 int trunc = 0; 4202 struct sctp_tmit_chunk *chk; 4203 struct sctp_chunkhdr *ch; 4204 struct sctp_paramhdr *ph; 4205 int ret_code = 0; 4206 int num_param = 0; 4207 4208 /* now it may be a reset or a reset-response */ 4209 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4210 4211 /* setup for adding the response */ 4212 sctp_alloc_a_chunk(stcb, chk); 4213 if (chk == NULL) { 4214 return (ret_code); 4215 } 4216 chk->copy_by_ref = 0; 4217 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4218 chk->rec.chunk_id.can_take_data = 0; 4219 chk->flags = 0; 4220 chk->asoc = &stcb->asoc; 4221 chk->no_fr_allowed = 0; 4222 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4223 chk->book_size_scale = 0; 4224 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4225 if (chk->data == NULL) { 4226 strres_nochunk: 4227 if (chk->data) { 4228 sctp_m_freem(chk->data); 4229 chk->data = NULL; 4230 } 4231 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4232 return (ret_code); 4233 } 4234 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4235 4236 /* setup chunk parameters */ 4237 chk->sent = SCTP_DATAGRAM_UNSENT; 4238 chk->snd_count = 0; 4239 chk->whoTo = NULL; 4240 4241 ch = mtod(chk->data, struct sctp_chunkhdr *); 4242 ch->chunk_type = SCTP_STREAM_RESET; 4243 ch->chunk_flags = 0; 4244 ch->chunk_length = htons(chk->send_size); 4245 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4246 offset += sizeof(struct sctp_chunkhdr); 4247 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4248 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4249 if (ph == NULL) { 4250 /* TSNH */ 4251 break; 4252 } 4253 param_len = ntohs(ph->param_length); 4254 if ((param_len > remaining_length) || 4255 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4256 /* bad parameter length */ 4257 break; 4258 } 4259 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4260 (uint8_t *)&cstore); 4261 if (ph == NULL) { 4262 /* TSNH */ 4263 break; 4264 } 4265 ptype = ntohs(ph->param_type); 4266 num_param++; 4267 if (param_len > sizeof(cstore)) { 4268 trunc = 1; 4269 } else { 4270 trunc = 0; 4271 } 4272 if (num_param > SCTP_MAX_RESET_PARAMS) { 4273 /* hit the max of parameters already sorry.. */ 4274 break; 4275 } 4276 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4277 struct sctp_stream_reset_out_request *req_out; 4278 4279 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4280 break; 4281 } 4282 req_out = (struct sctp_stream_reset_out_request *)ph; 4283 num_req++; 4284 if (stcb->asoc.stream_reset_outstanding) { 4285 seq = ntohl(req_out->response_seq); 4286 if (seq == stcb->asoc.str_reset_seq_out) { 4287 /* implicit ack */ 4288 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4289 } 4290 } 4291 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4292 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4293 struct sctp_stream_reset_add_strm *str_add; 4294 4295 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4296 break; 4297 } 4298 str_add = (struct sctp_stream_reset_add_strm *)ph; 4299 num_req++; 4300 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4301 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4302 struct sctp_stream_reset_add_strm *str_add; 4303 4304 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4305 break; 4306 } 4307 str_add = (struct sctp_stream_reset_add_strm *)ph; 4308 num_req++; 4309 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4310 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4311 struct sctp_stream_reset_in_request *req_in; 4312 4313 num_req++; 4314 req_in = (struct sctp_stream_reset_in_request *)ph; 4315 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4316 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4317 struct sctp_stream_reset_tsn_request *req_tsn; 4318 4319 num_req++; 4320 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4321 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4322 ret_code = 1; 4323 goto strres_nochunk; 4324 } 4325 /* no more */ 4326 break; 4327 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4328 struct sctp_stream_reset_response *resp; 4329 uint32_t result; 4330 4331 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4332 break; 4333 } 4334 resp = (struct sctp_stream_reset_response *)ph; 4335 seq = ntohl(resp->response_seq); 4336 result = ntohl(resp->result); 4337 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4338 ret_code = 1; 4339 goto strres_nochunk; 4340 } 4341 } else { 4342 break; 4343 } 4344 offset += SCTP_SIZE32(param_len); 4345 if (remaining_length >= SCTP_SIZE32(param_len)) { 4346 remaining_length -= SCTP_SIZE32(param_len); 4347 } else { 4348 remaining_length = 0; 4349 } 4350 } 4351 if (num_req == 0) { 4352 /* we have no response free the stuff */ 4353 goto strres_nochunk; 4354 } 4355 /* ok we have a chunk to link in */ 4356 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4357 chk, 4358 sctp_next); 4359 stcb->asoc.ctrl_queue_cnt++; 4360 return (ret_code); 4361 } 4362 4363 /* 4364 * Handle a router or endpoints report of a packet loss, there are two ways 4365 * to handle this, either we get the whole packet and must disect it 4366 * ourselves (possibly with truncation and or corruption) or it is a summary 4367 * from a middle box that did the disectting for us. 4368 */ 4369 static void 4370 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4371 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4372 { 4373 uint32_t bottle_bw, on_queue; 4374 uint16_t trunc_len; 4375 unsigned int chlen; 4376 unsigned int at; 4377 struct sctp_chunk_desc desc; 4378 struct sctp_chunkhdr *ch; 4379 4380 chlen = ntohs(cp->ch.chunk_length); 4381 chlen -= sizeof(struct sctp_pktdrop_chunk); 4382 /* XXX possible chlen underflow */ 4383 if (chlen == 0) { 4384 ch = NULL; 4385 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4386 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4387 } else { 4388 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4389 chlen -= sizeof(struct sctphdr); 4390 /* XXX possible chlen underflow */ 4391 memset(&desc, 0, sizeof(desc)); 4392 } 4393 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4394 if (trunc_len > limit) { 4395 trunc_len = limit; 4396 } 4397 4398 /* now the chunks themselves */ 4399 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4400 desc.chunk_type = ch->chunk_type; 4401 /* get amount we need to move */ 4402 at = ntohs(ch->chunk_length); 4403 if (at < sizeof(struct sctp_chunkhdr)) { 4404 /* corrupt chunk, maybe at the end? */ 4405 SCTP_STAT_INCR(sctps_pdrpcrupt); 4406 break; 4407 } 4408 if (trunc_len == 0) { 4409 /* we are supposed to have all of it */ 4410 if (at > chlen) { 4411 /* corrupt skip it */ 4412 SCTP_STAT_INCR(sctps_pdrpcrupt); 4413 break; 4414 } 4415 } else { 4416 /* is there enough of it left ? */ 4417 if (desc.chunk_type == SCTP_DATA) { 4418 if (chlen < (sizeof(struct sctp_data_chunk) + 4419 sizeof(desc.data_bytes))) { 4420 break; 4421 } 4422 } else { 4423 if (chlen < sizeof(struct sctp_chunkhdr)) { 4424 break; 4425 } 4426 } 4427 } 4428 if (desc.chunk_type == SCTP_DATA) { 4429 /* can we get out the tsn? */ 4430 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4431 SCTP_STAT_INCR(sctps_pdrpmbda); 4432 4433 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4434 /* yep */ 4435 struct sctp_data_chunk *dcp; 4436 uint8_t *ddp; 4437 unsigned int iii; 4438 4439 dcp = (struct sctp_data_chunk *)ch; 4440 ddp = (uint8_t *)(dcp + 1); 4441 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4442 desc.data_bytes[iii] = ddp[iii]; 4443 } 4444 desc.tsn_ifany = dcp->dp.tsn; 4445 } else { 4446 /* nope we are done. */ 4447 SCTP_STAT_INCR(sctps_pdrpnedat); 4448 break; 4449 } 4450 } else { 4451 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4452 SCTP_STAT_INCR(sctps_pdrpmbct); 4453 } 4454 4455 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4456 SCTP_STAT_INCR(sctps_pdrppdbrk); 4457 break; 4458 } 4459 if (SCTP_SIZE32(at) > chlen) { 4460 break; 4461 } 4462 chlen -= SCTP_SIZE32(at); 4463 if (chlen < sizeof(struct sctp_chunkhdr)) { 4464 /* done, none left */ 4465 break; 4466 } 4467 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4468 } 4469 /* Now update any rwnd --- possibly */ 4470 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4471 /* From a peer, we get a rwnd report */ 4472 uint32_t a_rwnd; 4473 4474 SCTP_STAT_INCR(sctps_pdrpfehos); 4475 4476 bottle_bw = ntohl(cp->bottle_bw); 4477 on_queue = ntohl(cp->current_onq); 4478 if (bottle_bw && on_queue) { 4479 /* a rwnd report is in here */ 4480 if (bottle_bw > on_queue) 4481 a_rwnd = bottle_bw - on_queue; 4482 else 4483 a_rwnd = 0; 4484 4485 if (a_rwnd == 0) 4486 stcb->asoc.peers_rwnd = 0; 4487 else { 4488 if (a_rwnd > stcb->asoc.total_flight) { 4489 stcb->asoc.peers_rwnd = 4490 a_rwnd - stcb->asoc.total_flight; 4491 } else { 4492 stcb->asoc.peers_rwnd = 0; 4493 } 4494 if (stcb->asoc.peers_rwnd < 4495 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4496 /* SWS sender side engages */ 4497 stcb->asoc.peers_rwnd = 0; 4498 } 4499 } 4500 } 4501 } else { 4502 SCTP_STAT_INCR(sctps_pdrpfmbox); 4503 } 4504 4505 /* now middle boxes in sat networks get a cwnd bump */ 4506 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4507 (stcb->asoc.sat_t3_loss_recovery == 0) && 4508 (stcb->asoc.sat_network)) { 4509 /* 4510 * This is debatable but for sat networks it makes sense 4511 * Note if a T3 timer has went off, we will prohibit any 4512 * changes to cwnd until we exit the t3 loss recovery. 4513 */ 4514 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4515 net, cp, &bottle_bw, &on_queue); 4516 } 4517 } 4518 4519 /* 4520 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4521 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4522 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4523 * length of the complete packet outputs: - length: modified to remaining 4524 * length after control processing - netp: modified to new sctp_nets after 4525 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4526 * bad packet,...) otherwise return the tcb for this packet 4527 */ 4528 #ifdef __GNUC__ 4529 __attribute__((noinline)) 4530 #endif 4531 static struct sctp_tcb * 4532 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4533 struct sockaddr *src, struct sockaddr *dst, 4534 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4535 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4536 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4537 uint32_t vrf_id, uint16_t port) 4538 { 4539 struct sctp_association *asoc; 4540 struct mbuf *op_err; 4541 char msg[SCTP_DIAG_INFO_LEN]; 4542 uint32_t vtag_in; 4543 int num_chunks = 0; /* number of control chunks processed */ 4544 uint32_t chk_length, contiguous; 4545 int ret; 4546 int abort_no_unlock = 0; 4547 int ecne_seen = 0; 4548 4549 /* 4550 * How big should this be, and should it be alloc'd? Lets try the 4551 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4552 * until we get into jumbo grams and such.. 4553 */ 4554 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4555 int got_auth = 0; 4556 uint32_t auth_offset = 0, auth_len = 0; 4557 int auth_skipped = 0; 4558 int asconf_cnt = 0; 4559 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4560 struct socket *so; 4561 #endif 4562 4563 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4564 iphlen, *offset, length, (void *)stcb); 4565 4566 if (stcb) { 4567 SCTP_TCB_LOCK_ASSERT(stcb); 4568 } 4569 /* validate chunk header length... */ 4570 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4571 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4572 ntohs(ch->chunk_length)); 4573 *offset = length; 4574 return (stcb); 4575 } 4576 /* 4577 * validate the verification tag 4578 */ 4579 vtag_in = ntohl(sh->v_tag); 4580 4581 if (ch->chunk_type == SCTP_INITIATION) { 4582 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4583 ntohs(ch->chunk_length), vtag_in); 4584 if (vtag_in != 0) { 4585 /* protocol error- silently discard... */ 4586 SCTP_STAT_INCR(sctps_badvtag); 4587 if (stcb != NULL) { 4588 SCTP_TCB_UNLOCK(stcb); 4589 } 4590 return (NULL); 4591 } 4592 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4593 /* 4594 * If there is no stcb, skip the AUTH chunk and process 4595 * later after a stcb is found (to validate the lookup was 4596 * valid. 4597 */ 4598 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4599 (stcb == NULL) && 4600 (inp->auth_supported == 1)) { 4601 /* save this chunk for later processing */ 4602 auth_skipped = 1; 4603 auth_offset = *offset; 4604 auth_len = ntohs(ch->chunk_length); 4605 4606 /* (temporarily) move past this chunk */ 4607 *offset += SCTP_SIZE32(auth_len); 4608 if (*offset >= length) { 4609 /* no more data left in the mbuf chain */ 4610 *offset = length; 4611 return (NULL); 4612 } 4613 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4614 sizeof(struct sctp_chunkhdr), chunk_buf); 4615 } 4616 if (ch == NULL) { 4617 /* Help */ 4618 *offset = length; 4619 return (stcb); 4620 } 4621 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4622 goto process_control_chunks; 4623 } 4624 /* 4625 * first check if it's an ASCONF with an unknown src addr we 4626 * need to look inside to find the association 4627 */ 4628 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4629 struct sctp_chunkhdr *asconf_ch = ch; 4630 uint32_t asconf_offset = 0, asconf_len = 0; 4631 4632 /* inp's refcount may be reduced */ 4633 SCTP_INP_INCR_REF(inp); 4634 4635 asconf_offset = *offset; 4636 do { 4637 asconf_len = ntohs(asconf_ch->chunk_length); 4638 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4639 break; 4640 stcb = sctp_findassociation_ep_asconf(m, 4641 *offset, 4642 dst, 4643 sh, &inp, netp, vrf_id); 4644 if (stcb != NULL) 4645 break; 4646 asconf_offset += SCTP_SIZE32(asconf_len); 4647 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4648 sizeof(struct sctp_chunkhdr), chunk_buf); 4649 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4650 if (stcb == NULL) { 4651 /* 4652 * reduce inp's refcount if not reduced in 4653 * sctp_findassociation_ep_asconf(). 4654 */ 4655 SCTP_INP_DECR_REF(inp); 4656 } 4657 4658 /* now go back and verify any auth chunk to be sure */ 4659 if (auth_skipped && (stcb != NULL)) { 4660 struct sctp_auth_chunk *auth; 4661 4662 auth = (struct sctp_auth_chunk *) 4663 sctp_m_getptr(m, auth_offset, 4664 auth_len, chunk_buf); 4665 got_auth = 1; 4666 auth_skipped = 0; 4667 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4668 auth_offset)) { 4669 /* auth HMAC failed so dump it */ 4670 *offset = length; 4671 return (stcb); 4672 } else { 4673 /* remaining chunks are HMAC checked */ 4674 stcb->asoc.authenticated = 1; 4675 } 4676 } 4677 } 4678 if (stcb == NULL) { 4679 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4680 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4681 msg); 4682 /* no association, so it's out of the blue... */ 4683 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4684 mflowtype, mflowid, inp->fibnum, 4685 vrf_id, port); 4686 *offset = length; 4687 return (NULL); 4688 } 4689 asoc = &stcb->asoc; 4690 /* ABORT and SHUTDOWN can use either v_tag... */ 4691 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4692 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4693 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4694 /* Take the T-bit always into account. */ 4695 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4696 (vtag_in == asoc->my_vtag)) || 4697 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4698 (asoc->peer_vtag != htonl(0)) && 4699 (vtag_in == asoc->peer_vtag))) { 4700 /* this is valid */ 4701 } else { 4702 /* drop this packet... */ 4703 SCTP_STAT_INCR(sctps_badvtag); 4704 if (stcb != NULL) { 4705 SCTP_TCB_UNLOCK(stcb); 4706 } 4707 return (NULL); 4708 } 4709 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4710 if (vtag_in != asoc->my_vtag) { 4711 /* 4712 * this could be a stale SHUTDOWN-ACK or the 4713 * peer never got the SHUTDOWN-COMPLETE and 4714 * is still hung; we have started a new asoc 4715 * but it won't complete until the shutdown 4716 * is completed 4717 */ 4718 if (stcb != NULL) { 4719 SCTP_TCB_UNLOCK(stcb); 4720 } 4721 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4722 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4723 msg); 4724 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4725 sh, inp, op_err, 4726 mflowtype, mflowid, fibnum, 4727 vrf_id, port); 4728 return (NULL); 4729 } 4730 } else { 4731 /* for all other chunks, vtag must match */ 4732 if (vtag_in != asoc->my_vtag) { 4733 /* invalid vtag... */ 4734 SCTPDBG(SCTP_DEBUG_INPUT3, 4735 "invalid vtag: %xh, expect %xh\n", 4736 vtag_in, asoc->my_vtag); 4737 SCTP_STAT_INCR(sctps_badvtag); 4738 if (stcb != NULL) { 4739 SCTP_TCB_UNLOCK(stcb); 4740 } 4741 *offset = length; 4742 return (NULL); 4743 } 4744 } 4745 } /* end if !SCTP_COOKIE_ECHO */ 4746 /* 4747 * process all control chunks... 4748 */ 4749 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4750 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4751 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4752 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4753 /* implied cookie-ack.. we must have lost the ack */ 4754 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4755 *netp); 4756 } 4757 4758 process_control_chunks: 4759 while (IS_SCTP_CONTROL(ch)) { 4760 /* validate chunk length */ 4761 chk_length = ntohs(ch->chunk_length); 4762 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4763 ch->chunk_type, chk_length); 4764 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4765 if (chk_length < sizeof(*ch) || 4766 (*offset + (int)chk_length) > length) { 4767 *offset = length; 4768 return (stcb); 4769 } 4770 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4771 /* 4772 * INIT and INIT-ACK only gets the init ack "header" portion 4773 * only because we don't have to process the peer's COOKIE. 4774 * All others get a complete chunk. 4775 */ 4776 switch (ch->chunk_type) { 4777 case SCTP_INITIATION: 4778 contiguous = sizeof(struct sctp_init_chunk); 4779 break; 4780 case SCTP_INITIATION_ACK: 4781 contiguous = sizeof(struct sctp_init_ack_chunk); 4782 break; 4783 default: 4784 contiguous = min(chk_length, sizeof(chunk_buf)); 4785 break; 4786 } 4787 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4788 contiguous, 4789 chunk_buf); 4790 if (ch == NULL) { 4791 *offset = length; 4792 if (stcb != NULL) { 4793 SCTP_TCB_UNLOCK(stcb); 4794 } 4795 return (NULL); 4796 } 4797 4798 num_chunks++; 4799 /* Save off the last place we got a control from */ 4800 if (stcb != NULL) { 4801 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4802 /* 4803 * allow last_control to be NULL if 4804 * ASCONF... ASCONF processing will find the 4805 * right net later 4806 */ 4807 if ((netp != NULL) && (*netp != NULL)) 4808 stcb->asoc.last_control_chunk_from = *netp; 4809 } 4810 } 4811 #ifdef SCTP_AUDITING_ENABLED 4812 sctp_audit_log(0xB0, ch->chunk_type); 4813 #endif 4814 4815 /* check to see if this chunk required auth, but isn't */ 4816 if ((stcb != NULL) && 4817 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4818 !stcb->asoc.authenticated) { 4819 /* "silently" ignore */ 4820 SCTP_STAT_INCR(sctps_recvauthmissing); 4821 goto next_chunk; 4822 } 4823 switch (ch->chunk_type) { 4824 case SCTP_INITIATION: 4825 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4826 /* The INIT chunk must be the only chunk. */ 4827 if ((num_chunks > 1) || 4828 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4829 /* RFC 4960 requires that no ABORT is sent */ 4830 *offset = length; 4831 if (stcb != NULL) { 4832 SCTP_TCB_UNLOCK(stcb); 4833 } 4834 return (NULL); 4835 } 4836 /* Honor our resource limit. */ 4837 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4838 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4839 sctp_abort_association(inp, stcb, m, iphlen, 4840 src, dst, sh, op_err, 4841 mflowtype, mflowid, 4842 vrf_id, port); 4843 *offset = length; 4844 return (NULL); 4845 } 4846 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4847 (struct sctp_init_chunk *)ch, inp, 4848 stcb, *netp, &abort_no_unlock, 4849 mflowtype, mflowid, 4850 vrf_id, port); 4851 *offset = length; 4852 if ((!abort_no_unlock) && (stcb != NULL)) { 4853 SCTP_TCB_UNLOCK(stcb); 4854 } 4855 return (NULL); 4856 break; 4857 case SCTP_PAD_CHUNK: 4858 break; 4859 case SCTP_INITIATION_ACK: 4860 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4861 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4862 /* We are not interested anymore */ 4863 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4864 ; 4865 } else { 4866 *offset = length; 4867 if (stcb != NULL) { 4868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4869 so = SCTP_INP_SO(inp); 4870 atomic_add_int(&stcb->asoc.refcnt, 1); 4871 SCTP_TCB_UNLOCK(stcb); 4872 SCTP_SOCKET_LOCK(so, 1); 4873 SCTP_TCB_LOCK(stcb); 4874 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4875 #endif 4876 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4877 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4878 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4879 SCTP_SOCKET_UNLOCK(so, 1); 4880 #endif 4881 } 4882 return (NULL); 4883 } 4884 } 4885 /* The INIT-ACK chunk must be the only chunk. */ 4886 if ((num_chunks > 1) || 4887 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4888 *offset = length; 4889 return (stcb); 4890 } 4891 if ((netp != NULL) && (*netp != NULL)) { 4892 ret = sctp_handle_init_ack(m, iphlen, *offset, 4893 src, dst, sh, 4894 (struct sctp_init_ack_chunk *)ch, 4895 stcb, *netp, 4896 &abort_no_unlock, 4897 mflowtype, mflowid, 4898 vrf_id); 4899 } else { 4900 ret = -1; 4901 } 4902 *offset = length; 4903 if (abort_no_unlock) { 4904 return (NULL); 4905 } 4906 /* 4907 * Special case, I must call the output routine to 4908 * get the cookie echoed 4909 */ 4910 if ((stcb != NULL) && (ret == 0)) { 4911 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4912 } 4913 return (stcb); 4914 break; 4915 case SCTP_SELECTIVE_ACK: 4916 case SCTP_NR_SELECTIVE_ACK: 4917 { 4918 int abort_now = 0; 4919 uint32_t a_rwnd, cum_ack; 4920 uint16_t num_seg, num_nr_seg, num_dup; 4921 uint8_t flags; 4922 int offset_seg, offset_dup; 4923 4924 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4925 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4926 SCTP_STAT_INCR(sctps_recvsacks); 4927 if (stcb == NULL) { 4928 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4929 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4930 break; 4931 } 4932 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4933 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4934 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4935 break; 4936 } 4937 } else { 4938 if (stcb->asoc.nrsack_supported == 0) { 4939 goto unknown_chunk; 4940 } 4941 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4942 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4943 break; 4944 } 4945 } 4946 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4947 /*- 4948 * If we have sent a shutdown-ack, we will pay no 4949 * attention to a sack sent in to us since 4950 * we don't care anymore. 4951 */ 4952 break; 4953 } 4954 flags = ch->chunk_flags; 4955 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4956 struct sctp_sack_chunk *sack; 4957 4958 sack = (struct sctp_sack_chunk *)ch; 4959 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4960 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4961 num_nr_seg = 0; 4962 num_dup = ntohs(sack->sack.num_dup_tsns); 4963 a_rwnd = ntohl(sack->sack.a_rwnd); 4964 if (sizeof(struct sctp_sack_chunk) + 4965 num_seg * sizeof(struct sctp_gap_ack_block) + 4966 num_dup * sizeof(uint32_t) != chk_length) { 4967 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4968 break; 4969 } 4970 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4971 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4972 } else { 4973 struct sctp_nr_sack_chunk *nr_sack; 4974 4975 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4976 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4977 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4978 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4979 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4980 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4981 if (sizeof(struct sctp_nr_sack_chunk) + 4982 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4983 num_dup * sizeof(uint32_t) != chk_length) { 4984 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4985 break; 4986 } 4987 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4988 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4989 } 4990 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4991 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4992 cum_ack, num_seg, a_rwnd); 4993 stcb->asoc.seen_a_sack_this_pkt = 1; 4994 if ((stcb->asoc.pr_sctp_cnt == 0) && 4995 (num_seg == 0) && (num_nr_seg == 0) && 4996 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4997 (stcb->asoc.saw_sack_with_frags == 0) && 4998 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4999 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5000 /* 5001 * We have a SIMPLE sack having no 5002 * prior segments and data on sent 5003 * queue to be acked. Use the faster 5004 * path sack processing. We also 5005 * allow window update sacks with no 5006 * missing segments to go this way 5007 * too. 5008 */ 5009 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5010 &abort_now, ecne_seen); 5011 } else { 5012 if ((netp != NULL) && (*netp != NULL)) { 5013 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5014 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5015 cum_ack, a_rwnd, ecne_seen); 5016 } 5017 } 5018 if (abort_now) { 5019 /* ABORT signal from sack processing */ 5020 *offset = length; 5021 return (NULL); 5022 } 5023 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5024 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5025 (stcb->asoc.stream_queue_cnt == 0)) { 5026 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5027 } 5028 break; 5029 } 5030 case SCTP_HEARTBEAT_REQUEST: 5031 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5032 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5033 SCTP_STAT_INCR(sctps_recvheartbeat); 5034 sctp_send_heartbeat_ack(stcb, m, *offset, 5035 chk_length, *netp); 5036 } 5037 break; 5038 case SCTP_HEARTBEAT_ACK: 5039 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5040 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5041 /* Its not ours */ 5042 *offset = length; 5043 return (stcb); 5044 } 5045 SCTP_STAT_INCR(sctps_recvheartbeatack); 5046 if ((netp != NULL) && (*netp != NULL)) { 5047 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5048 stcb, *netp); 5049 } 5050 break; 5051 case SCTP_ABORT_ASSOCIATION: 5052 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5053 (void *)stcb); 5054 *offset = length; 5055 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5056 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5057 return (NULL); 5058 } else { 5059 return (stcb); 5060 } 5061 } else { 5062 return (NULL); 5063 } 5064 break; 5065 case SCTP_SHUTDOWN: 5066 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5067 (void *)stcb); 5068 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5069 *offset = length; 5070 return (stcb); 5071 } 5072 if ((netp != NULL) && (*netp != NULL)) { 5073 int abort_flag = 0; 5074 5075 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5076 stcb, *netp, &abort_flag); 5077 if (abort_flag) { 5078 *offset = length; 5079 return (NULL); 5080 } 5081 } 5082 break; 5083 case SCTP_SHUTDOWN_ACK: 5084 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5085 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5086 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5087 } 5088 *offset = length; 5089 return (NULL); 5090 break; 5091 case SCTP_OPERATION_ERROR: 5092 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5093 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5094 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5095 *offset = length; 5096 return (NULL); 5097 } 5098 break; 5099 case SCTP_COOKIE_ECHO: 5100 SCTPDBG(SCTP_DEBUG_INPUT3, 5101 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5102 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5103 ; 5104 } else { 5105 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5106 /* We are not interested anymore */ 5107 abend: 5108 if (stcb != NULL) { 5109 SCTP_TCB_UNLOCK(stcb); 5110 } 5111 *offset = length; 5112 return (NULL); 5113 } 5114 } 5115 /*- 5116 * First are we accepting? We do this again here 5117 * since it is possible that a previous endpoint WAS 5118 * listening responded to a INIT-ACK and then 5119 * closed. We opened and bound.. and are now no 5120 * longer listening. 5121 * 5122 * XXXGL: notes on checking listen queue length. 5123 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5124 * SOLISTENING(), because a listening "UDP type" 5125 * socket isn't listening in terms of the socket 5126 * layer. It is a normal data flow socket, that 5127 * can fork off new connections. Thus, we should 5128 * look into sol_qlen only in case we are !UDP. 5129 * 2) Checking sol_qlen in general requires locking 5130 * the socket, and this code lacks that. 5131 */ 5132 if ((stcb == NULL) && 5133 (!SCTP_IS_LISTENING(inp) || 5134 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5135 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5136 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5137 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5138 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5139 sctp_abort_association(inp, stcb, m, iphlen, 5140 src, dst, sh, op_err, 5141 mflowtype, mflowid, 5142 vrf_id, port); 5143 } 5144 *offset = length; 5145 return (NULL); 5146 } else { 5147 struct mbuf *ret_buf; 5148 struct sctp_inpcb *linp; 5149 5150 if (stcb) { 5151 linp = NULL; 5152 } else { 5153 linp = inp; 5154 } 5155 5156 if (linp != NULL) { 5157 SCTP_ASOC_CREATE_LOCK(linp); 5158 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5159 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5160 SCTP_ASOC_CREATE_UNLOCK(linp); 5161 goto abend; 5162 } 5163 } 5164 5165 if (netp != NULL) { 5166 struct sctp_tcb *locked_stcb; 5167 5168 locked_stcb = stcb; 5169 ret_buf = 5170 sctp_handle_cookie_echo(m, iphlen, 5171 *offset, 5172 src, dst, 5173 sh, 5174 (struct sctp_cookie_echo_chunk *)ch, 5175 &inp, &stcb, netp, 5176 auth_skipped, 5177 auth_offset, 5178 auth_len, 5179 &locked_stcb, 5180 mflowtype, 5181 mflowid, 5182 vrf_id, 5183 port); 5184 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5185 SCTP_TCB_UNLOCK(locked_stcb); 5186 } 5187 if (stcb != NULL) { 5188 SCTP_TCB_LOCK_ASSERT(stcb); 5189 } 5190 } else { 5191 ret_buf = NULL; 5192 } 5193 if (linp != NULL) { 5194 SCTP_ASOC_CREATE_UNLOCK(linp); 5195 } 5196 if (ret_buf == NULL) { 5197 if (stcb != NULL) { 5198 SCTP_TCB_UNLOCK(stcb); 5199 } 5200 SCTPDBG(SCTP_DEBUG_INPUT3, 5201 "GAK, null buffer\n"); 5202 *offset = length; 5203 return (NULL); 5204 } 5205 /* if AUTH skipped, see if it verified... */ 5206 if (auth_skipped) { 5207 got_auth = 1; 5208 auth_skipped = 0; 5209 } 5210 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5211 /* 5212 * Restart the timer if we have 5213 * pending data 5214 */ 5215 struct sctp_tmit_chunk *chk; 5216 5217 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5218 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5219 } 5220 } 5221 break; 5222 case SCTP_COOKIE_ACK: 5223 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5224 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5225 return (stcb); 5226 } 5227 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5228 /* We are not interested anymore */ 5229 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5230 ; 5231 } else if (stcb) { 5232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5233 so = SCTP_INP_SO(inp); 5234 atomic_add_int(&stcb->asoc.refcnt, 1); 5235 SCTP_TCB_UNLOCK(stcb); 5236 SCTP_SOCKET_LOCK(so, 1); 5237 SCTP_TCB_LOCK(stcb); 5238 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5239 #endif 5240 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5241 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5242 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5243 SCTP_SOCKET_UNLOCK(so, 1); 5244 #endif 5245 *offset = length; 5246 return (NULL); 5247 } 5248 } 5249 if ((netp != NULL) && (*netp != NULL)) { 5250 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5251 } 5252 break; 5253 case SCTP_ECN_ECHO: 5254 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5255 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5256 /* Its not ours */ 5257 *offset = length; 5258 return (stcb); 5259 } 5260 if (stcb->asoc.ecn_supported == 0) { 5261 goto unknown_chunk; 5262 } 5263 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5264 ecne_seen = 1; 5265 break; 5266 case SCTP_ECN_CWR: 5267 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5268 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5269 *offset = length; 5270 return (stcb); 5271 } 5272 if (stcb->asoc.ecn_supported == 0) { 5273 goto unknown_chunk; 5274 } 5275 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5276 break; 5277 case SCTP_SHUTDOWN_COMPLETE: 5278 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5279 /* must be first and only chunk */ 5280 if ((num_chunks > 1) || 5281 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5282 *offset = length; 5283 return (stcb); 5284 } 5285 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5286 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5287 stcb, *netp); 5288 } 5289 *offset = length; 5290 return (NULL); 5291 break; 5292 case SCTP_ASCONF: 5293 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5294 if (stcb != NULL) { 5295 if (stcb->asoc.asconf_supported == 0) { 5296 goto unknown_chunk; 5297 } 5298 sctp_handle_asconf(m, *offset, src, 5299 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5300 asconf_cnt++; 5301 } 5302 break; 5303 case SCTP_ASCONF_ACK: 5304 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5305 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5306 /* Its not ours */ 5307 *offset = length; 5308 return (stcb); 5309 } 5310 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5311 if (stcb->asoc.asconf_supported == 0) { 5312 goto unknown_chunk; 5313 } 5314 /* He's alive so give him credit */ 5315 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5316 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5317 stcb->asoc.overall_error_count, 5318 0, 5319 SCTP_FROM_SCTP_INPUT, 5320 __LINE__); 5321 } 5322 stcb->asoc.overall_error_count = 0; 5323 sctp_handle_asconf_ack(m, *offset, 5324 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5325 if (abort_no_unlock) 5326 return (NULL); 5327 } 5328 break; 5329 case SCTP_FORWARD_CUM_TSN: 5330 case SCTP_IFORWARD_CUM_TSN: 5331 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5332 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5333 /* Its not ours */ 5334 *offset = length; 5335 return (stcb); 5336 } 5337 5338 if (stcb != NULL) { 5339 int abort_flag = 0; 5340 5341 if (stcb->asoc.prsctp_supported == 0) { 5342 goto unknown_chunk; 5343 } 5344 *fwd_tsn_seen = 1; 5345 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5346 /* We are not interested anymore */ 5347 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5348 so = SCTP_INP_SO(inp); 5349 atomic_add_int(&stcb->asoc.refcnt, 1); 5350 SCTP_TCB_UNLOCK(stcb); 5351 SCTP_SOCKET_LOCK(so, 1); 5352 SCTP_TCB_LOCK(stcb); 5353 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5354 #endif 5355 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5356 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5357 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5358 SCTP_SOCKET_UNLOCK(so, 1); 5359 #endif 5360 *offset = length; 5361 return (NULL); 5362 } 5363 /* 5364 * For sending a SACK this looks like DATA 5365 * chunks. 5366 */ 5367 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5368 sctp_handle_forward_tsn(stcb, 5369 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5370 if (abort_flag) { 5371 *offset = length; 5372 return (NULL); 5373 } 5374 } 5375 break; 5376 case SCTP_STREAM_RESET: 5377 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5378 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5379 /* Its not ours */ 5380 *offset = length; 5381 return (stcb); 5382 } 5383 if (stcb->asoc.reconfig_supported == 0) { 5384 goto unknown_chunk; 5385 } 5386 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5387 /* stop processing */ 5388 *offset = length; 5389 return (NULL); 5390 } 5391 break; 5392 case SCTP_PACKET_DROPPED: 5393 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5394 /* re-get it all please */ 5395 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5396 /* Its not ours */ 5397 *offset = length; 5398 return (stcb); 5399 } 5400 5401 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5402 if (stcb->asoc.pktdrop_supported == 0) { 5403 goto unknown_chunk; 5404 } 5405 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5406 stcb, *netp, 5407 min(chk_length, contiguous)); 5408 } 5409 break; 5410 case SCTP_AUTHENTICATION: 5411 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5412 if (stcb == NULL) { 5413 /* save the first AUTH for later processing */ 5414 if (auth_skipped == 0) { 5415 auth_offset = *offset; 5416 auth_len = chk_length; 5417 auth_skipped = 1; 5418 } 5419 /* skip this chunk (temporarily) */ 5420 goto next_chunk; 5421 } 5422 if (stcb->asoc.auth_supported == 0) { 5423 goto unknown_chunk; 5424 } 5425 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5426 (chk_length > (sizeof(struct sctp_auth_chunk) + 5427 SCTP_AUTH_DIGEST_LEN_MAX))) { 5428 /* Its not ours */ 5429 *offset = length; 5430 return (stcb); 5431 } 5432 if (got_auth == 1) { 5433 /* skip this chunk... it's already auth'd */ 5434 goto next_chunk; 5435 } 5436 got_auth = 1; 5437 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5438 m, *offset)) { 5439 /* auth HMAC failed so dump the packet */ 5440 *offset = length; 5441 return (stcb); 5442 } else { 5443 /* remaining chunks are HMAC checked */ 5444 stcb->asoc.authenticated = 1; 5445 } 5446 break; 5447 5448 default: 5449 unknown_chunk: 5450 /* it's an unknown chunk! */ 5451 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5452 struct sctp_gen_error_cause *cause; 5453 int len; 5454 5455 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5456 0, M_NOWAIT, 1, MT_DATA); 5457 if (op_err != NULL) { 5458 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5459 cause = mtod(op_err, struct sctp_gen_error_cause *); 5460 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5461 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5462 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5463 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5464 if (SCTP_BUF_NEXT(op_err) != NULL) { 5465 #ifdef SCTP_MBUF_LOGGING 5466 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5467 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5468 } 5469 #endif 5470 sctp_queue_op_err(stcb, op_err); 5471 } else { 5472 sctp_m_freem(op_err); 5473 } 5474 } 5475 } 5476 if ((ch->chunk_type & 0x80) == 0) { 5477 /* discard this packet */ 5478 *offset = length; 5479 return (stcb); 5480 } /* else skip this bad chunk and continue... */ 5481 break; 5482 } /* switch (ch->chunk_type) */ 5483 5484 5485 next_chunk: 5486 /* get the next chunk */ 5487 *offset += SCTP_SIZE32(chk_length); 5488 if (*offset >= length) { 5489 /* no more data left in the mbuf chain */ 5490 break; 5491 } 5492 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5493 sizeof(struct sctp_chunkhdr), chunk_buf); 5494 if (ch == NULL) { 5495 *offset = length; 5496 return (stcb); 5497 } 5498 } /* while */ 5499 5500 if ((asconf_cnt > 0) && (stcb != NULL)) { 5501 sctp_send_asconf_ack(stcb); 5502 } 5503 return (stcb); 5504 } 5505 5506 5507 /* 5508 * common input chunk processing (v4 and v6) 5509 */ 5510 void 5511 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5512 struct sockaddr *src, struct sockaddr *dst, 5513 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5514 uint8_t compute_crc, 5515 uint8_t ecn_bits, 5516 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5517 uint32_t vrf_id, uint16_t port) 5518 { 5519 uint32_t high_tsn; 5520 int fwd_tsn_seen = 0, data_processed = 0; 5521 struct mbuf *m = *mm, *op_err; 5522 char msg[SCTP_DIAG_INFO_LEN]; 5523 int un_sent; 5524 int cnt_ctrl_ready = 0; 5525 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5526 struct sctp_tcb *stcb = NULL; 5527 struct sctp_nets *net = NULL; 5528 5529 SCTP_STAT_INCR(sctps_recvdatagrams); 5530 #ifdef SCTP_AUDITING_ENABLED 5531 sctp_audit_log(0xE0, 1); 5532 sctp_auditing(0, inp, stcb, net); 5533 #endif 5534 if (compute_crc != 0) { 5535 uint32_t check, calc_check; 5536 5537 check = sh->checksum; 5538 sh->checksum = 0; 5539 calc_check = sctp_calculate_cksum(m, iphlen); 5540 sh->checksum = check; 5541 if (calc_check != check) { 5542 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5543 calc_check, check, (void *)m, length, iphlen); 5544 stcb = sctp_findassociation_addr(m, offset, src, dst, 5545 sh, ch, &inp, &net, vrf_id); 5546 #if defined(INET) || defined(INET6) 5547 if ((ch->chunk_type != SCTP_INITIATION) && 5548 (net != NULL) && (net->port != port)) { 5549 if (net->port == 0) { 5550 /* UDP encapsulation turned on. */ 5551 net->mtu -= sizeof(struct udphdr); 5552 if (stcb->asoc.smallest_mtu > net->mtu) { 5553 sctp_pathmtu_adjustment(stcb, net->mtu); 5554 } 5555 } else if (port == 0) { 5556 /* UDP encapsulation turned off. */ 5557 net->mtu += sizeof(struct udphdr); 5558 /* XXX Update smallest_mtu */ 5559 } 5560 net->port = port; 5561 } 5562 #endif 5563 if (net != NULL) { 5564 net->flowtype = mflowtype; 5565 net->flowid = mflowid; 5566 } 5567 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5568 if ((inp != NULL) && (stcb != NULL)) { 5569 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5570 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5571 } else if ((inp != NULL) && (stcb == NULL)) { 5572 inp_decr = inp; 5573 } 5574 SCTP_STAT_INCR(sctps_badsum); 5575 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5576 goto out; 5577 } 5578 } 5579 /* Destination port of 0 is illegal, based on RFC4960. */ 5580 if (sh->dest_port == 0) { 5581 SCTP_STAT_INCR(sctps_hdrops); 5582 goto out; 5583 } 5584 stcb = sctp_findassociation_addr(m, offset, src, dst, 5585 sh, ch, &inp, &net, vrf_id); 5586 #if defined(INET) || defined(INET6) 5587 if ((ch->chunk_type != SCTP_INITIATION) && 5588 (net != NULL) && (net->port != port)) { 5589 if (net->port == 0) { 5590 /* UDP encapsulation turned on. */ 5591 net->mtu -= sizeof(struct udphdr); 5592 if (stcb->asoc.smallest_mtu > net->mtu) { 5593 sctp_pathmtu_adjustment(stcb, net->mtu); 5594 } 5595 } else if (port == 0) { 5596 /* UDP encapsulation turned off. */ 5597 net->mtu += sizeof(struct udphdr); 5598 /* XXX Update smallest_mtu */ 5599 } 5600 net->port = port; 5601 } 5602 #endif 5603 if (net != NULL) { 5604 net->flowtype = mflowtype; 5605 net->flowid = mflowid; 5606 } 5607 if (inp == NULL) { 5608 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5609 SCTP_STAT_INCR(sctps_noport); 5610 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5611 goto out; 5612 } 5613 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5614 sctp_send_shutdown_complete2(src, dst, sh, 5615 mflowtype, mflowid, fibnum, 5616 vrf_id, port); 5617 goto out; 5618 } 5619 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5620 goto out; 5621 } 5622 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5623 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5624 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5625 (ch->chunk_type != SCTP_INIT))) { 5626 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5627 "Out of the blue"); 5628 sctp_send_abort(m, iphlen, src, dst, 5629 sh, 0, op_err, 5630 mflowtype, mflowid, fibnum, 5631 vrf_id, port); 5632 } 5633 } 5634 goto out; 5635 } else if (stcb == NULL) { 5636 inp_decr = inp; 5637 } 5638 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5639 (void *)m, iphlen, offset, length, (void *)stcb); 5640 if (stcb) { 5641 /* always clear this before beginning a packet */ 5642 stcb->asoc.authenticated = 0; 5643 stcb->asoc.seen_a_sack_this_pkt = 0; 5644 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5645 (void *)stcb, stcb->asoc.state); 5646 5647 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5648 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5649 /*- 5650 * If we hit here, we had a ref count 5651 * up when the assoc was aborted and the 5652 * timer is clearing out the assoc, we should 5653 * NOT respond to any packet.. its OOTB. 5654 */ 5655 SCTP_TCB_UNLOCK(stcb); 5656 stcb = NULL; 5657 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5658 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5659 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5660 msg); 5661 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5662 mflowtype, mflowid, inp->fibnum, 5663 vrf_id, port); 5664 goto out; 5665 } 5666 } 5667 if (IS_SCTP_CONTROL(ch)) { 5668 /* process the control portion of the SCTP packet */ 5669 /* sa_ignore NO_NULL_CHK */ 5670 stcb = sctp_process_control(m, iphlen, &offset, length, 5671 src, dst, sh, ch, 5672 inp, stcb, &net, &fwd_tsn_seen, 5673 mflowtype, mflowid, fibnum, 5674 vrf_id, port); 5675 if (stcb) { 5676 /* 5677 * This covers us if the cookie-echo was there and 5678 * it changes our INP. 5679 */ 5680 inp = stcb->sctp_ep; 5681 #if defined(INET) || defined(INET6) 5682 if ((ch->chunk_type != SCTP_INITIATION) && 5683 (net != NULL) && (net->port != port)) { 5684 if (net->port == 0) { 5685 /* UDP encapsulation turned on. */ 5686 net->mtu -= sizeof(struct udphdr); 5687 if (stcb->asoc.smallest_mtu > net->mtu) { 5688 sctp_pathmtu_adjustment(stcb, net->mtu); 5689 } 5690 } else if (port == 0) { 5691 /* UDP encapsulation turned off. */ 5692 net->mtu += sizeof(struct udphdr); 5693 /* XXX Update smallest_mtu */ 5694 } 5695 net->port = port; 5696 } 5697 #endif 5698 } 5699 } else { 5700 /* 5701 * no control chunks, so pre-process DATA chunks (these 5702 * checks are taken care of by control processing) 5703 */ 5704 5705 /* 5706 * if DATA only packet, and auth is required, then punt... 5707 * can't have authenticated without any AUTH (control) 5708 * chunks 5709 */ 5710 if ((stcb != NULL) && 5711 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5712 /* "silently" ignore */ 5713 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5714 SCTP_STAT_INCR(sctps_recvauthmissing); 5715 goto out; 5716 } 5717 if (stcb == NULL) { 5718 /* out of the blue DATA chunk */ 5719 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5720 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5721 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5722 msg); 5723 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5724 mflowtype, mflowid, fibnum, 5725 vrf_id, port); 5726 goto out; 5727 } 5728 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5729 /* v_tag mismatch! */ 5730 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5731 SCTP_STAT_INCR(sctps_badvtag); 5732 goto out; 5733 } 5734 } 5735 5736 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5737 if (stcb == NULL) { 5738 /* 5739 * no valid TCB for this packet, or we found it's a bad 5740 * packet while processing control, or we're done with this 5741 * packet (done or skip rest of data), so we drop it... 5742 */ 5743 goto out; 5744 } 5745 5746 /* 5747 * DATA chunk processing 5748 */ 5749 /* plow through the data chunks while length > offset */ 5750 5751 /* 5752 * Rest should be DATA only. Check authentication state if AUTH for 5753 * DATA is required. 5754 */ 5755 if ((length > offset) && 5756 (stcb != NULL) && 5757 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5758 !stcb->asoc.authenticated) { 5759 /* "silently" ignore */ 5760 SCTP_STAT_INCR(sctps_recvauthmissing); 5761 SCTPDBG(SCTP_DEBUG_AUTH1, 5762 "Data chunk requires AUTH, skipped\n"); 5763 goto trigger_send; 5764 } 5765 if (length > offset) { 5766 int retval; 5767 5768 /* 5769 * First check to make sure our state is correct. We would 5770 * not get here unless we really did have a tag, so we don't 5771 * abort if this happens, just dump the chunk silently. 5772 */ 5773 switch (SCTP_GET_STATE(stcb)) { 5774 case SCTP_STATE_COOKIE_ECHOED: 5775 /* 5776 * we consider data with valid tags in this state 5777 * shows us the cookie-ack was lost. Imply it was 5778 * there. 5779 */ 5780 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5781 break; 5782 case SCTP_STATE_COOKIE_WAIT: 5783 /* 5784 * We consider OOTB any data sent during asoc setup. 5785 */ 5786 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5787 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5788 msg); 5789 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5790 mflowtype, mflowid, inp->fibnum, 5791 vrf_id, port); 5792 goto out; 5793 /* sa_ignore NOTREACHED */ 5794 break; 5795 case SCTP_STATE_EMPTY: /* should not happen */ 5796 case SCTP_STATE_INUSE: /* should not happen */ 5797 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5798 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5799 default: 5800 goto out; 5801 /* sa_ignore NOTREACHED */ 5802 break; 5803 case SCTP_STATE_OPEN: 5804 case SCTP_STATE_SHUTDOWN_SENT: 5805 break; 5806 } 5807 /* plow through the data chunks while length > offset */ 5808 retval = sctp_process_data(mm, iphlen, &offset, length, 5809 inp, stcb, net, &high_tsn); 5810 if (retval == 2) { 5811 /* 5812 * The association aborted, NO UNLOCK needed since 5813 * the association is destroyed. 5814 */ 5815 stcb = NULL; 5816 goto out; 5817 } 5818 data_processed = 1; 5819 /* 5820 * Anything important needs to have been m_copy'ed in 5821 * process_data 5822 */ 5823 } 5824 5825 /* take care of ecn */ 5826 if ((data_processed == 1) && 5827 (stcb->asoc.ecn_supported == 1) && 5828 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5829 /* Yep, we need to add a ECNE */ 5830 sctp_send_ecn_echo(stcb, net, high_tsn); 5831 } 5832 5833 if ((data_processed == 0) && (fwd_tsn_seen)) { 5834 int was_a_gap; 5835 uint32_t highest_tsn; 5836 5837 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5838 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5839 } else { 5840 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5841 } 5842 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5843 stcb->asoc.send_sack = 1; 5844 sctp_sack_check(stcb, was_a_gap); 5845 } else if (fwd_tsn_seen) { 5846 stcb->asoc.send_sack = 1; 5847 } 5848 /* trigger send of any chunks in queue... */ 5849 trigger_send: 5850 #ifdef SCTP_AUDITING_ENABLED 5851 sctp_audit_log(0xE0, 2); 5852 sctp_auditing(1, inp, stcb, net); 5853 #endif 5854 SCTPDBG(SCTP_DEBUG_INPUT1, 5855 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5856 stcb->asoc.peers_rwnd, 5857 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5858 stcb->asoc.total_flight); 5859 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5860 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5861 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5862 } 5863 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5864 cnt_ctrl_ready || 5865 stcb->asoc.trigger_reset || 5866 ((un_sent) && 5867 (stcb->asoc.peers_rwnd > 0 || 5868 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5869 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5870 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5871 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5872 } 5873 #ifdef SCTP_AUDITING_ENABLED 5874 sctp_audit_log(0xE0, 3); 5875 sctp_auditing(2, inp, stcb, net); 5876 #endif 5877 out: 5878 if (stcb != NULL) { 5879 SCTP_TCB_UNLOCK(stcb); 5880 } 5881 if (inp_decr != NULL) { 5882 /* reduce ref-count */ 5883 SCTP_INP_WLOCK(inp_decr); 5884 SCTP_INP_DECR_REF(inp_decr); 5885 SCTP_INP_WUNLOCK(inp_decr); 5886 } 5887 return; 5888 } 5889 5890 #ifdef INET 5891 void 5892 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5893 { 5894 struct mbuf *m; 5895 int iphlen; 5896 uint32_t vrf_id = 0; 5897 uint8_t ecn_bits; 5898 struct sockaddr_in src, dst; 5899 struct ip *ip; 5900 struct sctphdr *sh; 5901 struct sctp_chunkhdr *ch; 5902 int length, offset; 5903 uint8_t compute_crc; 5904 uint32_t mflowid; 5905 uint8_t mflowtype; 5906 uint16_t fibnum; 5907 5908 iphlen = off; 5909 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5910 SCTP_RELEASE_PKT(i_pak); 5911 return; 5912 } 5913 m = SCTP_HEADER_TO_CHAIN(i_pak); 5914 #ifdef SCTP_MBUF_LOGGING 5915 /* Log in any input mbufs */ 5916 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5917 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5918 } 5919 #endif 5920 #ifdef SCTP_PACKET_LOGGING 5921 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5922 sctp_packet_log(m); 5923 } 5924 #endif 5925 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5926 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5927 m->m_pkthdr.len, 5928 if_name(m->m_pkthdr.rcvif), 5929 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5930 mflowid = m->m_pkthdr.flowid; 5931 mflowtype = M_HASHTYPE_GET(m); 5932 fibnum = M_GETFIB(m); 5933 SCTP_STAT_INCR(sctps_recvpackets); 5934 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5935 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5936 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5937 if (SCTP_BUF_LEN(m) < offset) { 5938 if ((m = m_pullup(m, offset)) == NULL) { 5939 SCTP_STAT_INCR(sctps_hdrops); 5940 return; 5941 } 5942 } 5943 ip = mtod(m, struct ip *); 5944 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5945 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5946 offset -= sizeof(struct sctp_chunkhdr); 5947 memset(&src, 0, sizeof(struct sockaddr_in)); 5948 src.sin_family = AF_INET; 5949 src.sin_len = sizeof(struct sockaddr_in); 5950 src.sin_port = sh->src_port; 5951 src.sin_addr = ip->ip_src; 5952 memset(&dst, 0, sizeof(struct sockaddr_in)); 5953 dst.sin_family = AF_INET; 5954 dst.sin_len = sizeof(struct sockaddr_in); 5955 dst.sin_port = sh->dest_port; 5956 dst.sin_addr = ip->ip_dst; 5957 length = ntohs(ip->ip_len); 5958 /* Validate mbuf chain length with IP payload length. */ 5959 if (SCTP_HEADER_LEN(m) != length) { 5960 SCTPDBG(SCTP_DEBUG_INPUT1, 5961 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5962 SCTP_STAT_INCR(sctps_hdrops); 5963 goto out; 5964 } 5965 /* SCTP does not allow broadcasts or multicasts */ 5966 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5967 goto out; 5968 } 5969 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5970 goto out; 5971 } 5972 ecn_bits = ip->ip_tos; 5973 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5974 SCTP_STAT_INCR(sctps_recvhwcrc); 5975 compute_crc = 0; 5976 } else { 5977 SCTP_STAT_INCR(sctps_recvswcrc); 5978 compute_crc = 1; 5979 } 5980 sctp_common_input_processing(&m, iphlen, offset, length, 5981 (struct sockaddr *)&src, 5982 (struct sockaddr *)&dst, 5983 sh, ch, 5984 compute_crc, 5985 ecn_bits, 5986 mflowtype, mflowid, fibnum, 5987 vrf_id, port); 5988 out: 5989 if (m) { 5990 sctp_m_freem(m); 5991 } 5992 return; 5993 } 5994 5995 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5996 extern int *sctp_cpuarry; 5997 #endif 5998 5999 int 6000 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6001 { 6002 struct mbuf *m; 6003 int off; 6004 6005 m = *mp; 6006 off = *offp; 6007 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6008 if (mp_ncpus > 1) { 6009 struct ip *ip; 6010 struct sctphdr *sh; 6011 int offset; 6012 int cpu_to_use; 6013 uint32_t flowid, tag; 6014 6015 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6016 flowid = m->m_pkthdr.flowid; 6017 } else { 6018 /* 6019 * No flow id built by lower layers fix it so we 6020 * create one. 6021 */ 6022 offset = off + sizeof(struct sctphdr); 6023 if (SCTP_BUF_LEN(m) < offset) { 6024 if ((m = m_pullup(m, offset)) == NULL) { 6025 SCTP_STAT_INCR(sctps_hdrops); 6026 return (IPPROTO_DONE); 6027 } 6028 } 6029 ip = mtod(m, struct ip *); 6030 sh = (struct sctphdr *)((caddr_t)ip + off); 6031 tag = htonl(sh->v_tag); 6032 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6033 m->m_pkthdr.flowid = flowid; 6034 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6035 } 6036 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6037 sctp_queue_to_mcore(m, off, cpu_to_use); 6038 return (IPPROTO_DONE); 6039 } 6040 #endif 6041 sctp_input_with_port(m, off, 0); 6042 return (IPPROTO_DONE); 6043 } 6044 #endif 6045