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 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 59 60 static void 61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 62 { 63 struct sctp_nets *net; 64 65 /* 66 * This now not only stops all cookie timers it also stops any INIT 67 * timers as well. This will make sure that the timers are stopped 68 * in all collision cases. 69 */ 70 SCTP_TCB_LOCK_ASSERT(stcb); 71 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 72 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 77 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 78 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 79 stcb->sctp_ep, 80 stcb, 81 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 82 } 83 } 84 } 85 86 /* INIT handler */ 87 static void 88 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 89 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 90 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 91 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 92 uint8_t mflowtype, uint32_t mflowid, 93 uint32_t vrf_id, uint16_t port) 94 { 95 struct sctp_init *init; 96 struct mbuf *op_err; 97 98 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 99 (void *)stcb); 100 if (stcb == NULL) { 101 SCTP_INP_RLOCK(inp); 102 } 103 /* validate length */ 104 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 105 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 106 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 107 mflowtype, mflowid, 108 vrf_id, port); 109 if (stcb) 110 *abort_no_unlock = 1; 111 goto outnow; 112 } 113 /* validate parameters */ 114 init = &cp->init; 115 if (init->initiate_tag == 0) { 116 /* protocol error... send abort */ 117 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 118 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 119 mflowtype, mflowid, 120 vrf_id, port); 121 if (stcb) 122 *abort_no_unlock = 1; 123 goto outnow; 124 } 125 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 126 /* invalid parameter... send abort */ 127 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 128 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 129 mflowtype, mflowid, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_inbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 138 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 139 mflowtype, mflowid, 140 vrf_id, port); 141 if (stcb) 142 *abort_no_unlock = 1; 143 goto outnow; 144 } 145 if (init->num_outbound_streams == 0) { 146 /* protocol error... send abort */ 147 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 148 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 149 mflowtype, mflowid, 150 vrf_id, port); 151 if (stcb) 152 *abort_no_unlock = 1; 153 goto outnow; 154 } 155 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 156 offset + ntohs(cp->ch.chunk_length))) { 157 /* auth parameter(s) error... send abort */ 158 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 159 "Problem with AUTH parameters"); 160 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 161 mflowtype, mflowid, 162 vrf_id, port); 163 if (stcb) 164 *abort_no_unlock = 1; 165 goto outnow; 166 } 167 /* We are only accepting if we have a listening socket. */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (!SCTP_IS_LISTENING(inp)))) { 172 /* 173 * FIX ME ?? What about TCP model and we have a 174 * match/restart case? Actually no fix is needed. the lookup 175 * will always find the existing assoc so stcb would not be 176 * NULL. It may be questionable to do this since we COULD 177 * just send back the INIT-ACK and hope that the app did 178 * accept()'s by the time the COOKIE was sent. But there is 179 * a price to pay for COOKIE generation and I don't want to 180 * pay it on the chance that the app will actually do some 181 * accepts(). The App just looses and should NOT be in this 182 * state :-) 183 */ 184 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 185 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 186 "No listener"); 187 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 188 mflowtype, mflowid, inp->fibnum, 189 vrf_id, port); 190 } 191 goto outnow; 192 } 193 if ((stcb != NULL) && 194 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 195 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 196 sctp_send_shutdown_ack(stcb, NULL); 197 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 198 } else { 199 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 200 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 201 src, dst, sh, cp, 202 mflowtype, mflowid, 203 vrf_id, port); 204 } 205 outnow: 206 if (stcb == NULL) { 207 SCTP_INP_RUNLOCK(inp); 208 } 209 } 210 211 /* 212 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 213 */ 214 215 int 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 218 SCTP_UNUSED 219 #endif 220 ) 221 { 222 int unsent_data; 223 unsigned int i; 224 struct sctp_stream_queue_pending *sp; 225 struct sctp_association *asoc; 226 227 /* 228 * This function returns if any stream has true unsent data on it. 229 * Note that as it looks through it will clean up any places that 230 * have old data that has been sent but left at top of stream queue. 231 */ 232 asoc = &stcb->asoc; 233 unsent_data = 0; 234 SCTP_TCB_SEND_LOCK(stcb); 235 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 236 /* Check to see if some data queued */ 237 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 238 /* sa_ignore FREED_MEMORY */ 239 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 240 if (sp == NULL) { 241 continue; 242 } 243 if ((sp->msg_is_complete) && 244 (sp->length == 0) && 245 (sp->sender_all_done)) { 246 /* 247 * We are doing differed cleanup. Last time 248 * through when we took all the data the 249 * sender_all_done was not set. 250 */ 251 if (sp->put_last_out == 0) { 252 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 253 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 254 sp->sender_all_done, 255 sp->length, 256 sp->msg_is_complete, 257 sp->put_last_out); 258 } 259 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 260 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 261 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 262 if (sp->net) { 263 sctp_free_remote_addr(sp->net); 264 sp->net = NULL; 265 } 266 if (sp->data) { 267 sctp_m_freem(sp->data); 268 sp->data = NULL; 269 } 270 sctp_free_a_strmoq(stcb, sp, so_locked); 271 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 272 unsent_data++; 273 } 274 } else { 275 unsent_data++; 276 } 277 if (unsent_data > 0) { 278 break; 279 } 280 } 281 } 282 SCTP_TCB_SEND_UNLOCK(stcb); 283 return (unsent_data); 284 } 285 286 static int 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 288 { 289 struct sctp_init *init; 290 struct sctp_association *asoc; 291 struct sctp_nets *lnet; 292 unsigned int i; 293 294 init = &cp->init; 295 asoc = &stcb->asoc; 296 /* save off parameters */ 297 asoc->peer_vtag = ntohl(init->initiate_tag); 298 asoc->peers_rwnd = ntohl(init->a_rwnd); 299 /* init tsn's */ 300 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 301 302 if (!TAILQ_EMPTY(&asoc->nets)) { 303 /* update any ssthresh's that may have a default */ 304 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 305 lnet->ssthresh = asoc->peers_rwnd; 306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 307 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 308 } 309 310 } 311 } 312 SCTP_TCB_SEND_LOCK(stcb); 313 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 314 unsigned int newcnt; 315 struct sctp_stream_out *outs; 316 struct sctp_stream_queue_pending *sp, *nsp; 317 struct sctp_tmit_chunk *chk, *nchk; 318 319 /* abandon the upper streams */ 320 newcnt = ntohs(init->num_inbound_streams); 321 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 322 if (chk->rec.data.sid >= newcnt) { 323 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 324 asoc->send_queue_cnt--; 325 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 326 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 327 #ifdef INVARIANTS 328 } else { 329 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 330 #endif 331 } 332 if (chk->data != NULL) { 333 sctp_free_bufspace(stcb, asoc, chk, 1); 334 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 335 0, chk, SCTP_SO_NOT_LOCKED); 336 if (chk->data) { 337 sctp_m_freem(chk->data); 338 chk->data = NULL; 339 } 340 } 341 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 342 /* sa_ignore FREED_MEMORY */ 343 } 344 } 345 if (asoc->strmout) { 346 for (i = newcnt; i < asoc->pre_open_streams; i++) { 347 outs = &asoc->strmout[i]; 348 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 349 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 350 TAILQ_REMOVE(&outs->outqueue, sp, next); 351 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 352 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 353 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 354 if (sp->data) { 355 sctp_m_freem(sp->data); 356 sp->data = NULL; 357 } 358 if (sp->net) { 359 sctp_free_remote_addr(sp->net); 360 sp->net = NULL; 361 } 362 /* Free the chunk */ 363 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 364 /* sa_ignore FREED_MEMORY */ 365 } 366 outs->state = SCTP_STREAM_CLOSED; 367 } 368 } 369 /* cut back the count */ 370 asoc->pre_open_streams = newcnt; 371 } 372 SCTP_TCB_SEND_UNLOCK(stcb); 373 asoc->streamoutcnt = asoc->pre_open_streams; 374 if (asoc->strmout) { 375 for (i = 0; i < asoc->streamoutcnt; i++) { 376 asoc->strmout[i].state = SCTP_STREAM_OPEN; 377 } 378 } 379 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 380 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 381 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 382 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 383 } 384 /* This is the next one we expect */ 385 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 386 387 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 388 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 389 390 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 391 /* open the requested streams */ 392 393 if (asoc->strmin != NULL) { 394 /* Free the old ones */ 395 for (i = 0; i < asoc->streamincnt; i++) { 396 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 397 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].sid = i; 415 asoc->strmin[i].last_mid_delivered = 0xffffffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 418 asoc->strmin[i].pd_api_started = 0; 419 asoc->strmin[i].delivery_started = 0; 420 } 421 /* 422 * load_address_from_init will put the addresses into the 423 * association when the COOKIE is processed or the INIT-ACK is 424 * processed. Both types of COOKIE's existing and new call this 425 * routine. It will remove addresses that are no longer in the 426 * association (for the restarting case where addresses are 427 * removed). Up front when the INIT arrives we will discard it if it 428 * is a restart and new addresses have been added. 429 */ 430 /* sa_ignore MEMLEAK */ 431 return (0); 432 } 433 434 /* 435 * INIT-ACK message processing/consumption returns value < 0 on error 436 */ 437 static int 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 439 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 440 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 441 struct sctp_nets *net, int *abort_no_unlock, 442 uint8_t mflowtype, uint32_t mflowid, 443 uint32_t vrf_id) 444 { 445 struct sctp_association *asoc; 446 struct mbuf *op_err; 447 int retval, abort_flag, cookie_found; 448 int initack_limit; 449 int nat_friendly = 0; 450 451 /* First verify that we have no illegal param's */ 452 abort_flag = 0; 453 cookie_found = 0; 454 455 op_err = sctp_arethere_unrecognized_parameters(m, 456 (offset + sizeof(struct sctp_init_chunk)), 457 &abort_flag, (struct sctp_chunkhdr *)cp, 458 &nat_friendly, &cookie_found); 459 if (abort_flag) { 460 /* Send an abort and notify peer */ 461 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 462 *abort_no_unlock = 1; 463 return (-1); 464 } 465 if (!cookie_found) { 466 uint16_t len; 467 468 /* Only report the missing cookie parameter */ 469 if (op_err != NULL) { 470 sctp_m_freem(op_err); 471 } 472 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 473 /* We abort with an error of missing mandatory param */ 474 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 475 if (op_err != NULL) { 476 struct sctp_error_missing_param *cause; 477 478 SCTP_BUF_LEN(op_err) = len; 479 cause = mtod(op_err, struct sctp_error_missing_param *); 480 /* Subtract the reserved param */ 481 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 482 cause->cause.length = htons(len); 483 cause->num_missing_params = htonl(1); 484 cause->type[0] = htons(SCTP_STATE_COOKIE); 485 } 486 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 487 src, dst, sh, op_err, 488 mflowtype, mflowid, 489 vrf_id, net->port); 490 *abort_no_unlock = 1; 491 return (-3); 492 } 493 asoc = &stcb->asoc; 494 asoc->peer_supports_nat = (uint8_t)nat_friendly; 495 /* process the peer's parameters in the INIT-ACK */ 496 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 497 if (retval < 0) { 498 if (op_err != NULL) { 499 sctp_m_freem(op_err); 500 } 501 return (retval); 502 } 503 initack_limit = offset + ntohs(cp->ch.chunk_length); 504 /* load all addresses */ 505 if ((retval = sctp_load_addresses_from_init(stcb, m, 506 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 507 src, dst, NULL, stcb->asoc.port))) { 508 if (op_err != NULL) { 509 sctp_m_freem(op_err); 510 } 511 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 512 "Problem with address parameters"); 513 SCTPDBG(SCTP_DEBUG_INPUT1, 514 "Load addresses from INIT causes an abort %d\n", 515 retval); 516 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 517 src, dst, sh, op_err, 518 mflowtype, mflowid, 519 vrf_id, net->port); 520 *abort_no_unlock = 1; 521 return (-1); 522 } 523 /* if the peer doesn't support asconf, flush the asconf queue */ 524 if (asoc->asconf_supported == 0) { 525 struct sctp_asconf_addr *param, *nparam; 526 527 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 528 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 529 SCTP_FREE(param, SCTP_M_ASC_ADDR); 530 } 531 } 532 533 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 534 stcb->asoc.local_hmacs); 535 if (op_err) { 536 sctp_queue_op_err(stcb, op_err); 537 /* queuing will steal away the mbuf chain to the out queue */ 538 op_err = NULL; 539 } 540 /* extract the cookie and queue it to "echo" it back... */ 541 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 542 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 543 stcb->asoc.overall_error_count, 544 0, 545 SCTP_FROM_SCTP_INPUT, 546 __LINE__); 547 } 548 stcb->asoc.overall_error_count = 0; 549 net->error_count = 0; 550 551 /* 552 * Cancel the INIT timer, We do this first before queueing the 553 * cookie. We always cancel at the primary to assue that we are 554 * canceling the timer started by the INIT which always goes to the 555 * primary. 556 */ 557 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 558 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 559 560 /* calculate the RTO */ 561 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 562 SCTP_RTT_FROM_NON_DATA); 563 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 564 return (retval); 565 } 566 567 static void 568 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 569 struct sctp_tcb *stcb, struct sctp_nets *net) 570 { 571 union sctp_sockstore store; 572 struct sctp_nets *r_net, *f_net; 573 struct timeval tv; 574 int req_prim = 0; 575 uint16_t old_error_counter; 576 577 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 578 /* Invalid length */ 579 return; 580 } 581 582 memset(&store, 0, sizeof(store)); 583 switch (cp->heartbeat.hb_info.addr_family) { 584 #ifdef INET 585 case AF_INET: 586 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 587 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 588 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 589 store.sin.sin_port = stcb->rport; 590 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 591 sizeof(store.sin.sin_addr)); 592 } else { 593 return; 594 } 595 break; 596 #endif 597 #ifdef INET6 598 case AF_INET6: 599 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 600 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 601 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 602 store.sin6.sin6_port = stcb->rport; 603 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 604 } else { 605 return; 606 } 607 break; 608 #endif 609 default: 610 return; 611 } 612 r_net = sctp_findnet(stcb, &store.sa); 613 if (r_net == NULL) { 614 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 615 return; 616 } 617 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 618 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 619 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 620 /* 621 * If the its a HB and it's random value is correct when can 622 * confirm the destination. 623 */ 624 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 625 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 626 stcb->asoc.primary_destination = r_net; 627 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 628 f_net = TAILQ_FIRST(&stcb->asoc.nets); 629 if (f_net != r_net) { 630 /* 631 * first one on the list is NOT the primary 632 * sctp_cmpaddr() is much more efficient if 633 * the primary is the first on the list, 634 * make it so. 635 */ 636 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 637 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 638 } 639 req_prim = 1; 640 } 641 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 642 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 643 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 644 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 645 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 646 } 647 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 648 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 649 stcb->asoc.overall_error_count, 650 0, 651 SCTP_FROM_SCTP_INPUT, 652 __LINE__); 653 } 654 stcb->asoc.overall_error_count = 0; 655 old_error_counter = r_net->error_count; 656 r_net->error_count = 0; 657 r_net->hb_responded = 1; 658 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 659 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 660 /* Now lets do a RTO with this */ 661 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 662 SCTP_RTT_FROM_NON_DATA); 663 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 664 r_net->dest_state |= SCTP_ADDR_REACHABLE; 665 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 666 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 667 } 668 if (r_net->dest_state & SCTP_ADDR_PF) { 669 r_net->dest_state &= ~SCTP_ADDR_PF; 670 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 671 } 672 if (old_error_counter > 0) { 673 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 674 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 675 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 676 } 677 if (r_net == stcb->asoc.primary_destination) { 678 if (stcb->asoc.alternate) { 679 /* release the alternate, primary is good */ 680 sctp_free_remote_addr(stcb->asoc.alternate); 681 stcb->asoc.alternate = NULL; 682 } 683 } 684 /* Mobility adaptation */ 685 if (req_prim) { 686 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 687 SCTP_MOBILITY_BASE) || 688 sctp_is_mobility_feature_on(stcb->sctp_ep, 689 SCTP_MOBILITY_FASTHANDOFF)) && 690 sctp_is_mobility_feature_on(stcb->sctp_ep, 691 SCTP_MOBILITY_PRIM_DELETED)) { 692 693 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 694 stcb->sctp_ep, stcb, NULL, 695 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 696 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 697 SCTP_MOBILITY_FASTHANDOFF)) { 698 sctp_assoc_immediate_retrans(stcb, 699 stcb->asoc.primary_destination); 700 } 701 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 702 SCTP_MOBILITY_BASE)) { 703 sctp_move_chunks_from_net(stcb, 704 stcb->asoc.deleted_primary); 705 } 706 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 707 stcb->asoc.deleted_primary); 708 } 709 } 710 } 711 712 static int 713 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 714 { 715 /* 716 * Return 0 means we want you to proceed with the abort non-zero 717 * means no abort processing. 718 */ 719 uint32_t new_vtag; 720 struct sctpasochead *head; 721 722 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 723 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 724 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 725 atomic_add_int(&stcb->asoc.refcnt, 1); 726 SCTP_TCB_UNLOCK(stcb); 727 SCTP_INP_INFO_WLOCK(); 728 SCTP_TCB_LOCK(stcb); 729 atomic_subtract_int(&stcb->asoc.refcnt, 1); 730 } else { 731 return (0); 732 } 733 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 734 /* generate a new vtag and send init */ 735 LIST_REMOVE(stcb, sctp_asocs); 736 stcb->asoc.my_vtag = new_vtag; 737 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 738 /* 739 * put it in the bucket in the vtag hash of assoc's for the 740 * system 741 */ 742 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 743 SCTP_INP_INFO_WUNLOCK(); 744 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 745 return (1); 746 } else { 747 /* 748 * treat like a case where the cookie expired i.e.: - dump 749 * current cookie. - generate a new vtag. - resend init. 750 */ 751 /* generate a new vtag and send init */ 752 LIST_REMOVE(stcb, sctp_asocs); 753 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 754 sctp_stop_all_cookie_timers(stcb); 755 sctp_toss_old_cookies(stcb, &stcb->asoc); 756 stcb->asoc.my_vtag = new_vtag; 757 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 758 /* 759 * put it in the bucket in the vtag hash of assoc's for the 760 * system 761 */ 762 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 763 SCTP_INP_INFO_WUNLOCK(); 764 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 765 return (1); 766 } 767 return (0); 768 } 769 770 static int 771 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 772 struct sctp_nets *net) 773 { 774 /* 775 * return 0 means we want you to proceed with the abort non-zero 776 * means no abort processing 777 */ 778 if (stcb->asoc.auth_supported == 0) { 779 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 780 return (0); 781 } 782 sctp_asconf_send_nat_state_update(stcb, net); 783 return (1); 784 } 785 786 787 /* Returns 1 if the stcb was aborted, 0 otherwise */ 788 static int 789 sctp_handle_abort(struct sctp_abort_chunk *abort, 790 struct sctp_tcb *stcb, struct sctp_nets *net) 791 { 792 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 793 struct socket *so; 794 #endif 795 uint16_t len; 796 uint16_t error; 797 798 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 799 if (stcb == NULL) 800 return (0); 801 802 len = ntohs(abort->ch.chunk_length); 803 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 804 /* 805 * Need to check the cause codes for our two magic nat 806 * aborts which don't kill the assoc necessarily. 807 */ 808 struct sctp_error_cause *cause; 809 810 cause = (struct sctp_error_cause *)(abort + 1); 811 error = ntohs(cause->code); 812 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 813 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 814 abort->ch.chunk_flags); 815 if (sctp_handle_nat_colliding_state(stcb)) { 816 return (0); 817 } 818 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 819 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 820 abort->ch.chunk_flags); 821 if (sctp_handle_nat_missing_state(stcb, net)) { 822 return (0); 823 } 824 } 825 } else { 826 error = 0; 827 } 828 /* stop any receive timers */ 829 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 830 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 831 /* notify user of the abort and clean up... */ 832 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 833 /* free the tcb */ 834 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 835 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 836 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 837 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 838 } 839 #ifdef SCTP_ASOCLOG_OF_TSNS 840 sctp_print_out_track_log(stcb); 841 #endif 842 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 843 so = SCTP_INP_SO(stcb->sctp_ep); 844 atomic_add_int(&stcb->asoc.refcnt, 1); 845 SCTP_TCB_UNLOCK(stcb); 846 SCTP_SOCKET_LOCK(so, 1); 847 SCTP_TCB_LOCK(stcb); 848 atomic_subtract_int(&stcb->asoc.refcnt, 1); 849 #endif 850 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); 851 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 852 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 853 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 854 SCTP_SOCKET_UNLOCK(so, 1); 855 #endif 856 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 857 return (1); 858 } 859 860 static void 861 sctp_start_net_timers(struct sctp_tcb *stcb) 862 { 863 uint32_t cnt_hb_sent; 864 struct sctp_nets *net; 865 866 cnt_hb_sent = 0; 867 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 868 /* 869 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 870 * If the dest in unconfirmed send a hb as well if under 871 * max_hb_burst have been sent. 872 */ 873 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 874 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 875 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 876 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 877 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 878 cnt_hb_sent++; 879 } 880 } 881 if (cnt_hb_sent) { 882 sctp_chunk_output(stcb->sctp_ep, stcb, 883 SCTP_OUTPUT_FROM_COOKIE_ACK, 884 SCTP_SO_NOT_LOCKED); 885 } 886 } 887 888 889 static void 890 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 891 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 892 { 893 struct sctp_association *asoc; 894 int some_on_streamwheel; 895 int old_state; 896 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 897 struct socket *so; 898 #endif 899 900 SCTPDBG(SCTP_DEBUG_INPUT2, 901 "sctp_handle_shutdown: handling SHUTDOWN\n"); 902 if (stcb == NULL) 903 return; 904 asoc = &stcb->asoc; 905 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 906 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 907 return; 908 } 909 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 910 /* Shutdown NOT the expected size */ 911 return; 912 } 913 old_state = SCTP_GET_STATE(stcb); 914 sctp_update_acked(stcb, cp, abort_flag); 915 if (*abort_flag) { 916 return; 917 } 918 if (asoc->control_pdapi) { 919 /* 920 * With a normal shutdown we assume the end of last record. 921 */ 922 SCTP_INP_READ_LOCK(stcb->sctp_ep); 923 if (asoc->control_pdapi->on_strm_q) { 924 struct sctp_stream_in *strm; 925 926 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 927 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 928 /* Unordered */ 929 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 930 asoc->control_pdapi->on_strm_q = 0; 931 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 932 /* Ordered */ 933 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 934 asoc->control_pdapi->on_strm_q = 0; 935 #ifdef INVARIANTS 936 } else { 937 panic("Unknown state on ctrl:%p on_strm_q:%d", 938 asoc->control_pdapi, 939 asoc->control_pdapi->on_strm_q); 940 #endif 941 } 942 } 943 asoc->control_pdapi->end_added = 1; 944 asoc->control_pdapi->pdapi_aborted = 1; 945 asoc->control_pdapi = NULL; 946 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 947 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 948 so = SCTP_INP_SO(stcb->sctp_ep); 949 atomic_add_int(&stcb->asoc.refcnt, 1); 950 SCTP_TCB_UNLOCK(stcb); 951 SCTP_SOCKET_LOCK(so, 1); 952 SCTP_TCB_LOCK(stcb); 953 atomic_subtract_int(&stcb->asoc.refcnt, 1); 954 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 955 /* assoc was freed while we were unlocked */ 956 SCTP_SOCKET_UNLOCK(so, 1); 957 return; 958 } 959 #endif 960 if (stcb->sctp_socket) { 961 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 962 } 963 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 964 SCTP_SOCKET_UNLOCK(so, 1); 965 #endif 966 } 967 /* goto SHUTDOWN_RECEIVED state to block new requests */ 968 if (stcb->sctp_socket) { 969 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 970 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 971 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 972 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 973 /* 974 * notify upper layer that peer has initiated a 975 * shutdown 976 */ 977 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 978 979 /* reset time */ 980 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 981 } 982 } 983 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 984 /* 985 * stop the shutdown timer, since we WILL move to 986 * SHUTDOWN-ACK-SENT. 987 */ 988 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 989 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 990 } 991 /* Now is there unsent data on a stream somewhere? */ 992 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 993 994 if (!TAILQ_EMPTY(&asoc->send_queue) || 995 !TAILQ_EMPTY(&asoc->sent_queue) || 996 some_on_streamwheel) { 997 /* By returning we will push more data out */ 998 return; 999 } else { 1000 /* no outstanding data to send, so move on... */ 1001 /* send SHUTDOWN-ACK */ 1002 /* move to SHUTDOWN-ACK-SENT state */ 1003 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 1004 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 1005 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 1006 } 1007 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 1008 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 1009 sctp_stop_timers_for_shutdown(stcb); 1010 sctp_send_shutdown_ack(stcb, net); 1011 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 1012 stcb->sctp_ep, stcb, net); 1013 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1014 sctp_send_shutdown_ack(stcb, net); 1015 } 1016 } 1017 } 1018 1019 static void 1020 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1021 struct sctp_tcb *stcb, 1022 struct sctp_nets *net) 1023 { 1024 struct sctp_association *asoc; 1025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1026 struct socket *so; 1027 1028 so = SCTP_INP_SO(stcb->sctp_ep); 1029 #endif 1030 SCTPDBG(SCTP_DEBUG_INPUT2, 1031 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1032 if (stcb == NULL) 1033 return; 1034 1035 asoc = &stcb->asoc; 1036 /* process according to association state */ 1037 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1038 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1039 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1040 sctp_send_shutdown_complete(stcb, net, 1); 1041 SCTP_TCB_UNLOCK(stcb); 1042 return; 1043 } 1044 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 1045 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1046 /* unexpected SHUTDOWN-ACK... so ignore... */ 1047 SCTP_TCB_UNLOCK(stcb); 1048 return; 1049 } 1050 if (asoc->control_pdapi) { 1051 /* 1052 * With a normal shutdown we assume the end of last record. 1053 */ 1054 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1055 asoc->control_pdapi->end_added = 1; 1056 asoc->control_pdapi->pdapi_aborted = 1; 1057 asoc->control_pdapi = NULL; 1058 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1059 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1060 atomic_add_int(&stcb->asoc.refcnt, 1); 1061 SCTP_TCB_UNLOCK(stcb); 1062 SCTP_SOCKET_LOCK(so, 1); 1063 SCTP_TCB_LOCK(stcb); 1064 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1065 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1066 /* assoc was freed while we were unlocked */ 1067 SCTP_SOCKET_UNLOCK(so, 1); 1068 return; 1069 } 1070 #endif 1071 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1072 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1073 SCTP_SOCKET_UNLOCK(so, 1); 1074 #endif 1075 } 1076 #ifdef INVARIANTS 1077 if (!TAILQ_EMPTY(&asoc->send_queue) || 1078 !TAILQ_EMPTY(&asoc->sent_queue) || 1079 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1080 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1081 } 1082 #endif 1083 /* stop the timer */ 1084 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1085 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1086 /* send SHUTDOWN-COMPLETE */ 1087 sctp_send_shutdown_complete(stcb, net, 0); 1088 /* notify upper layer protocol */ 1089 if (stcb->sctp_socket) { 1090 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1091 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1092 stcb->sctp_socket->so_snd.sb_cc = 0; 1093 } 1094 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1095 } 1096 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1097 /* free the TCB but first save off the ep */ 1098 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1099 atomic_add_int(&stcb->asoc.refcnt, 1); 1100 SCTP_TCB_UNLOCK(stcb); 1101 SCTP_SOCKET_LOCK(so, 1); 1102 SCTP_TCB_LOCK(stcb); 1103 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1104 #endif 1105 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1106 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1107 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1108 SCTP_SOCKET_UNLOCK(so, 1); 1109 #endif 1110 } 1111 1112 static void 1113 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1114 { 1115 switch (chunk_type) { 1116 case SCTP_ASCONF_ACK: 1117 case SCTP_ASCONF: 1118 sctp_asconf_cleanup(stcb); 1119 break; 1120 case SCTP_IFORWARD_CUM_TSN: 1121 case SCTP_FORWARD_CUM_TSN: 1122 stcb->asoc.prsctp_supported = 0; 1123 break; 1124 default: 1125 SCTPDBG(SCTP_DEBUG_INPUT2, 1126 "Peer does not support chunk type %d (0x%x).\n", 1127 chunk_type, chunk_type); 1128 break; 1129 } 1130 } 1131 1132 /* 1133 * Skip past the param header and then we will find the param that caused the 1134 * problem. There are a number of param's in a ASCONF OR the prsctp param 1135 * these will turn of specific features. 1136 * XXX: Is this the right thing to do? 1137 */ 1138 static void 1139 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1140 { 1141 switch (parameter_type) { 1142 /* pr-sctp draft */ 1143 case SCTP_PRSCTP_SUPPORTED: 1144 stcb->asoc.prsctp_supported = 0; 1145 break; 1146 case SCTP_SUPPORTED_CHUNK_EXT: 1147 break; 1148 /* draft-ietf-tsvwg-addip-sctp */ 1149 case SCTP_HAS_NAT_SUPPORT: 1150 stcb->asoc.peer_supports_nat = 0; 1151 break; 1152 case SCTP_ADD_IP_ADDRESS: 1153 case SCTP_DEL_IP_ADDRESS: 1154 case SCTP_SET_PRIM_ADDR: 1155 stcb->asoc.asconf_supported = 0; 1156 break; 1157 case SCTP_SUCCESS_REPORT: 1158 case SCTP_ERROR_CAUSE_IND: 1159 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1160 SCTPDBG(SCTP_DEBUG_INPUT2, 1161 "Turning off ASCONF to this strange peer\n"); 1162 stcb->asoc.asconf_supported = 0; 1163 break; 1164 default: 1165 SCTPDBG(SCTP_DEBUG_INPUT2, 1166 "Peer does not support param type %d (0x%x)??\n", 1167 parameter_type, parameter_type); 1168 break; 1169 } 1170 } 1171 1172 static int 1173 sctp_handle_error(struct sctp_chunkhdr *ch, 1174 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1175 { 1176 struct sctp_error_cause *cause; 1177 struct sctp_association *asoc; 1178 uint32_t remaining_length, adjust; 1179 uint16_t code, cause_code, cause_length; 1180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1181 struct socket *so; 1182 #endif 1183 1184 /* parse through all of the errors and process */ 1185 asoc = &stcb->asoc; 1186 cause = (struct sctp_error_cause *)((caddr_t)ch + 1187 sizeof(struct sctp_chunkhdr)); 1188 remaining_length = ntohs(ch->chunk_length); 1189 if (remaining_length > limit) { 1190 remaining_length = limit; 1191 } 1192 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1193 remaining_length -= sizeof(struct sctp_chunkhdr); 1194 } else { 1195 remaining_length = 0; 1196 } 1197 code = 0; 1198 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1199 /* Process an Error Cause */ 1200 cause_code = ntohs(cause->code); 1201 cause_length = ntohs(cause->length); 1202 if ((cause_length > remaining_length) || (cause_length == 0)) { 1203 /* Invalid cause length, possibly due to truncation. */ 1204 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1205 remaining_length, cause_length); 1206 return (0); 1207 } 1208 if (code == 0) { 1209 /* report the first error cause */ 1210 code = cause_code; 1211 } 1212 switch (cause_code) { 1213 case SCTP_CAUSE_INVALID_STREAM: 1214 case SCTP_CAUSE_MISSING_PARAM: 1215 case SCTP_CAUSE_INVALID_PARAM: 1216 case SCTP_CAUSE_NO_USER_DATA: 1217 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1218 cause_code); 1219 break; 1220 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1221 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1222 ch->chunk_flags); 1223 if (sctp_handle_nat_colliding_state(stcb)) { 1224 return (0); 1225 } 1226 break; 1227 case SCTP_CAUSE_NAT_MISSING_STATE: 1228 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1229 ch->chunk_flags); 1230 if (sctp_handle_nat_missing_state(stcb, net)) { 1231 return (0); 1232 } 1233 break; 1234 case SCTP_CAUSE_STALE_COOKIE: 1235 /* 1236 * We only act if we have echoed a cookie and are 1237 * waiting. 1238 */ 1239 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1240 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1241 struct sctp_error_stale_cookie *stale_cookie; 1242 1243 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1244 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1245 /* Double it to be more robust on RTX */ 1246 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1247 asoc->cookie_preserve_req *= 2; 1248 } else { 1249 asoc->cookie_preserve_req = UINT32_MAX; 1250 } 1251 asoc->stale_cookie_count++; 1252 if (asoc->stale_cookie_count > 1253 asoc->max_init_times) { 1254 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1255 /* now free the asoc */ 1256 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1257 so = SCTP_INP_SO(stcb->sctp_ep); 1258 atomic_add_int(&stcb->asoc.refcnt, 1); 1259 SCTP_TCB_UNLOCK(stcb); 1260 SCTP_SOCKET_LOCK(so, 1); 1261 SCTP_TCB_LOCK(stcb); 1262 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1263 #endif 1264 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1265 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1266 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1267 SCTP_SOCKET_UNLOCK(so, 1); 1268 #endif 1269 return (-1); 1270 } 1271 /* blast back to INIT state */ 1272 sctp_toss_old_cookies(stcb, &stcb->asoc); 1273 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1274 sctp_stop_all_cookie_timers(stcb); 1275 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1276 } 1277 break; 1278 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1279 /* 1280 * Nothing we can do here, we don't do hostname 1281 * addresses so if the peer does not like my IPv6 1282 * (or IPv4 for that matter) it does not matter. If 1283 * they don't support that type of address, they can 1284 * NOT possibly get that packet type... i.e. with no 1285 * IPv6 you can't receive a IPv6 packet. so we can 1286 * safely ignore this one. If we ever added support 1287 * for HOSTNAME Addresses, then we would need to do 1288 * something here. 1289 */ 1290 break; 1291 case SCTP_CAUSE_UNRECOG_CHUNK: 1292 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1293 struct sctp_error_unrecognized_chunk *unrec_chunk; 1294 1295 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1296 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1297 } 1298 break; 1299 case SCTP_CAUSE_UNRECOG_PARAM: 1300 /* XXX: We only consider the first parameter */ 1301 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1302 struct sctp_paramhdr *unrec_parameter; 1303 1304 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1305 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1306 } 1307 break; 1308 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1309 /* 1310 * We ignore this since the timer will drive out a 1311 * new cookie anyway and there timer will drive us 1312 * to send a SHUTDOWN_COMPLETE. We can't send one 1313 * here since we don't have their tag. 1314 */ 1315 break; 1316 case SCTP_CAUSE_DELETING_LAST_ADDR: 1317 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1318 case SCTP_CAUSE_DELETING_SRC_ADDR: 1319 /* 1320 * We should NOT get these here, but in a 1321 * ASCONF-ACK. 1322 */ 1323 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1324 cause_code); 1325 break; 1326 case SCTP_CAUSE_OUT_OF_RESC: 1327 /* 1328 * And what, pray tell do we do with the fact that 1329 * the peer is out of resources? Not really sure we 1330 * could do anything but abort. I suspect this 1331 * should have came WITH an abort instead of in a 1332 * OP-ERROR. 1333 */ 1334 break; 1335 default: 1336 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1337 cause_code); 1338 break; 1339 } 1340 adjust = SCTP_SIZE32(cause_length); 1341 if (remaining_length >= adjust) { 1342 remaining_length -= adjust; 1343 } else { 1344 remaining_length = 0; 1345 } 1346 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1347 } 1348 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1349 return (0); 1350 } 1351 1352 static int 1353 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1354 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1355 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1356 struct sctp_nets *net, int *abort_no_unlock, 1357 uint8_t mflowtype, uint32_t mflowid, 1358 uint32_t vrf_id) 1359 { 1360 struct sctp_init_ack *init_ack; 1361 struct mbuf *op_err; 1362 1363 SCTPDBG(SCTP_DEBUG_INPUT2, 1364 "sctp_handle_init_ack: handling INIT-ACK\n"); 1365 1366 if (stcb == NULL) { 1367 SCTPDBG(SCTP_DEBUG_INPUT2, 1368 "sctp_handle_init_ack: TCB is null\n"); 1369 return (-1); 1370 } 1371 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1372 /* Invalid length */ 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 init_ack = &cp->init; 1382 /* validate parameters */ 1383 if (init_ack->initiate_tag == 0) { 1384 /* protocol error... send an abort */ 1385 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1386 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1387 src, dst, sh, op_err, 1388 mflowtype, mflowid, 1389 vrf_id, net->port); 1390 *abort_no_unlock = 1; 1391 return (-1); 1392 } 1393 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1394 /* protocol error... send an abort */ 1395 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1396 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1397 src, dst, sh, op_err, 1398 mflowtype, mflowid, 1399 vrf_id, net->port); 1400 *abort_no_unlock = 1; 1401 return (-1); 1402 } 1403 if (init_ack->num_inbound_streams == 0) { 1404 /* protocol error... send an abort */ 1405 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1406 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1407 src, dst, sh, op_err, 1408 mflowtype, mflowid, 1409 vrf_id, net->port); 1410 *abort_no_unlock = 1; 1411 return (-1); 1412 } 1413 if (init_ack->num_outbound_streams == 0) { 1414 /* protocol error... send an abort */ 1415 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1416 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1417 src, dst, sh, op_err, 1418 mflowtype, mflowid, 1419 vrf_id, net->port); 1420 *abort_no_unlock = 1; 1421 return (-1); 1422 } 1423 /* process according to association state... */ 1424 switch (SCTP_GET_STATE(stcb)) { 1425 case SCTP_STATE_COOKIE_WAIT: 1426 /* this is the expected state for this chunk */ 1427 /* process the INIT-ACK parameters */ 1428 if (stcb->asoc.primary_destination->dest_state & 1429 SCTP_ADDR_UNCONFIRMED) { 1430 /* 1431 * The primary is where we sent the INIT, we can 1432 * always consider it confirmed when the INIT-ACK is 1433 * returned. Do this before we load addresses 1434 * though. 1435 */ 1436 stcb->asoc.primary_destination->dest_state &= 1437 ~SCTP_ADDR_UNCONFIRMED; 1438 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1439 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1440 } 1441 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1442 net, abort_no_unlock, 1443 mflowtype, mflowid, 1444 vrf_id) < 0) { 1445 /* error in parsing parameters */ 1446 return (-1); 1447 } 1448 /* update our state */ 1449 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1450 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1451 1452 /* reset the RTO calc */ 1453 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1454 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1455 stcb->asoc.overall_error_count, 1456 0, 1457 SCTP_FROM_SCTP_INPUT, 1458 __LINE__); 1459 } 1460 stcb->asoc.overall_error_count = 0; 1461 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1462 /* 1463 * collapse the init timer back in case of a exponential 1464 * backoff 1465 */ 1466 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1467 stcb, net); 1468 /* 1469 * the send at the end of the inbound data processing will 1470 * cause the cookie to be sent 1471 */ 1472 break; 1473 case SCTP_STATE_SHUTDOWN_SENT: 1474 /* incorrect state... discard */ 1475 break; 1476 case SCTP_STATE_COOKIE_ECHOED: 1477 /* incorrect state... discard */ 1478 break; 1479 case SCTP_STATE_OPEN: 1480 /* incorrect state... discard */ 1481 break; 1482 case SCTP_STATE_EMPTY: 1483 case SCTP_STATE_INUSE: 1484 default: 1485 /* incorrect state... discard */ 1486 return (-1); 1487 break; 1488 } 1489 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1490 return (0); 1491 } 1492 1493 static struct sctp_tcb * 1494 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1495 struct sockaddr *src, struct sockaddr *dst, 1496 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1497 struct sctp_inpcb *inp, struct sctp_nets **netp, 1498 struct sockaddr *init_src, int *notification, 1499 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1500 uint8_t mflowtype, uint32_t mflowid, 1501 uint32_t vrf_id, uint16_t port); 1502 1503 1504 /* 1505 * handle a state cookie for an existing association m: input packet mbuf 1506 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1507 * "split" mbuf and the cookie signature does not exist offset: offset into 1508 * mbuf to the cookie-echo chunk 1509 */ 1510 static struct sctp_tcb * 1511 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1512 struct sockaddr *src, struct sockaddr *dst, 1513 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1514 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1515 struct sockaddr *init_src, int *notification, 1516 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1517 uint8_t mflowtype, uint32_t mflowid, 1518 uint32_t vrf_id, uint16_t port) 1519 { 1520 struct sctp_association *asoc; 1521 struct sctp_init_chunk *init_cp, init_buf; 1522 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1523 struct sctp_nets *net; 1524 struct mbuf *op_err; 1525 struct timeval old; 1526 int init_offset, initack_offset, i; 1527 int retval; 1528 int spec_flag = 0; 1529 uint32_t how_indx; 1530 #if defined(SCTP_DETAILED_STR_STATS) 1531 int j; 1532 #endif 1533 1534 net = *netp; 1535 /* I know that the TCB is non-NULL from the caller */ 1536 asoc = &stcb->asoc; 1537 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1538 if (asoc->cookie_how[how_indx] == 0) 1539 break; 1540 } 1541 if (how_indx < sizeof(asoc->cookie_how)) { 1542 asoc->cookie_how[how_indx] = 1; 1543 } 1544 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1545 /* SHUTDOWN came in after sending INIT-ACK */ 1546 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1547 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1548 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1549 mflowtype, mflowid, inp->fibnum, 1550 vrf_id, net->port); 1551 if (how_indx < sizeof(asoc->cookie_how)) 1552 asoc->cookie_how[how_indx] = 2; 1553 return (NULL); 1554 } 1555 /* 1556 * find and validate the INIT chunk in the cookie (peer's info) the 1557 * INIT should start after the cookie-echo header struct (chunk 1558 * header, state cookie header struct) 1559 */ 1560 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1561 1562 init_cp = (struct sctp_init_chunk *) 1563 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1564 (uint8_t *)&init_buf); 1565 if (init_cp == NULL) { 1566 /* could not pull a INIT chunk in cookie */ 1567 return (NULL); 1568 } 1569 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1570 return (NULL); 1571 } 1572 /* 1573 * find and validate the INIT-ACK chunk in the cookie (my info) the 1574 * INIT-ACK follows the INIT chunk 1575 */ 1576 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1577 initack_cp = (struct sctp_init_ack_chunk *) 1578 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1579 (uint8_t *)&initack_buf); 1580 if (initack_cp == NULL) { 1581 /* could not pull INIT-ACK chunk in cookie */ 1582 return (NULL); 1583 } 1584 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1585 return (NULL); 1586 } 1587 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1588 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1589 /* 1590 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1591 * to get into the OPEN state 1592 */ 1593 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1594 /*- 1595 * Opps, this means that we somehow generated two vtag's 1596 * the same. I.e. we did: 1597 * Us Peer 1598 * <---INIT(tag=a)------ 1599 * ----INIT-ACK(tag=t)--> 1600 * ----INIT(tag=t)------> *1 1601 * <---INIT-ACK(tag=a)--- 1602 * <----CE(tag=t)------------- *2 1603 * 1604 * At point *1 we should be generating a different 1605 * tag t'. Which means we would throw away the CE and send 1606 * ours instead. Basically this is case C (throw away side). 1607 */ 1608 if (how_indx < sizeof(asoc->cookie_how)) 1609 asoc->cookie_how[how_indx] = 17; 1610 return (NULL); 1611 1612 } 1613 switch (SCTP_GET_STATE(stcb)) { 1614 case SCTP_STATE_COOKIE_WAIT: 1615 case SCTP_STATE_COOKIE_ECHOED: 1616 /* 1617 * INIT was sent but got a COOKIE_ECHO with the 1618 * correct tags... just accept it...but we must 1619 * process the init so that we can make sure we have 1620 * the right seq no's. 1621 */ 1622 /* First we must process the INIT !! */ 1623 retval = sctp_process_init(init_cp, stcb); 1624 if (retval < 0) { 1625 if (how_indx < sizeof(asoc->cookie_how)) 1626 asoc->cookie_how[how_indx] = 3; 1627 return (NULL); 1628 } 1629 /* we have already processed the INIT so no problem */ 1630 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1631 stcb, net, 1632 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1633 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1634 stcb, net, 1635 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1636 /* update current state */ 1637 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1638 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1639 else 1640 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1641 1642 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1643 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1644 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1645 stcb->sctp_ep, stcb, NULL); 1646 } 1647 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1648 sctp_stop_all_cookie_timers(stcb); 1649 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1650 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1651 (!SCTP_IS_LISTENING(inp))) { 1652 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1653 struct socket *so; 1654 #endif 1655 /* 1656 * Here is where collision would go if we 1657 * did a connect() and instead got a 1658 * init/init-ack/cookie done before the 1659 * init-ack came back.. 1660 */ 1661 stcb->sctp_ep->sctp_flags |= 1662 SCTP_PCB_FLAGS_CONNECTED; 1663 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1664 so = SCTP_INP_SO(stcb->sctp_ep); 1665 atomic_add_int(&stcb->asoc.refcnt, 1); 1666 SCTP_TCB_UNLOCK(stcb); 1667 SCTP_SOCKET_LOCK(so, 1); 1668 SCTP_TCB_LOCK(stcb); 1669 atomic_add_int(&stcb->asoc.refcnt, -1); 1670 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1671 SCTP_SOCKET_UNLOCK(so, 1); 1672 return (NULL); 1673 } 1674 #endif 1675 soisconnected(stcb->sctp_socket); 1676 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1677 SCTP_SOCKET_UNLOCK(so, 1); 1678 #endif 1679 } 1680 /* notify upper layer */ 1681 *notification = SCTP_NOTIFY_ASSOC_UP; 1682 /* 1683 * since we did not send a HB make sure we don't 1684 * double things 1685 */ 1686 old.tv_sec = cookie->time_entered.tv_sec; 1687 old.tv_usec = cookie->time_entered.tv_usec; 1688 net->hb_responded = 1; 1689 sctp_calculate_rto(stcb, asoc, net, &old, 1690 SCTP_RTT_FROM_NON_DATA); 1691 1692 if (stcb->asoc.sctp_autoclose_ticks && 1693 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1694 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1695 inp, stcb, NULL); 1696 } 1697 break; 1698 default: 1699 /* 1700 * we're in the OPEN state (or beyond), so peer must 1701 * have simply lost the COOKIE-ACK 1702 */ 1703 break; 1704 } /* end switch */ 1705 sctp_stop_all_cookie_timers(stcb); 1706 /* 1707 * We ignore the return code here.. not sure if we should 1708 * somehow abort.. but we do have an existing asoc. This 1709 * really should not fail. 1710 */ 1711 if (sctp_load_addresses_from_init(stcb, m, 1712 init_offset + sizeof(struct sctp_init_chunk), 1713 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1714 if (how_indx < sizeof(asoc->cookie_how)) 1715 asoc->cookie_how[how_indx] = 4; 1716 return (NULL); 1717 } 1718 /* respond with a COOKIE-ACK */ 1719 sctp_toss_old_cookies(stcb, asoc); 1720 sctp_send_cookie_ack(stcb); 1721 if (how_indx < sizeof(asoc->cookie_how)) 1722 asoc->cookie_how[how_indx] = 5; 1723 return (stcb); 1724 } 1725 1726 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1727 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1728 cookie->tie_tag_my_vtag == 0 && 1729 cookie->tie_tag_peer_vtag == 0) { 1730 /* 1731 * case C in Section 5.2.4 Table 2: XMOO silently discard 1732 */ 1733 if (how_indx < sizeof(asoc->cookie_how)) 1734 asoc->cookie_how[how_indx] = 6; 1735 return (NULL); 1736 } 1737 /* 1738 * If nat support, and the below and stcb is established, send back 1739 * a ABORT(colliding state) if we are established. 1740 */ 1741 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1742 (asoc->peer_supports_nat) && 1743 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1744 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1745 (asoc->peer_vtag == 0)))) { 1746 /* 1747 * Special case - Peer's support nat. We may have two init's 1748 * that we gave out the same tag on since one was not 1749 * established.. i.e. we get INIT from host-1 behind the nat 1750 * and we respond tag-a, we get a INIT from host-2 behind 1751 * the nat and we get tag-a again. Then we bring up host-1 1752 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1753 * Now we have colliding state. We must send an abort here 1754 * with colliding state indication. 1755 */ 1756 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1757 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1758 mflowtype, mflowid, inp->fibnum, 1759 vrf_id, port); 1760 return (NULL); 1761 } 1762 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1763 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1764 (asoc->peer_vtag == 0))) { 1765 /* 1766 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1767 * should be ok, re-accept peer info 1768 */ 1769 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1770 /* 1771 * Extension of case C. If we hit this, then the 1772 * random number generator returned the same vtag 1773 * when we first sent our INIT-ACK and when we later 1774 * sent our INIT. The side with the seq numbers that 1775 * are different will be the one that normnally 1776 * would have hit case C. This in effect "extends" 1777 * our vtags in this collision case to be 64 bits. 1778 * The same collision could occur aka you get both 1779 * vtag and seq number the same twice in a row.. but 1780 * is much less likely. If it did happen then we 1781 * would proceed through and bring up the assoc.. we 1782 * may end up with the wrong stream setup however.. 1783 * which would be bad.. but there is no way to 1784 * tell.. until we send on a stream that does not 1785 * exist :-) 1786 */ 1787 if (how_indx < sizeof(asoc->cookie_how)) 1788 asoc->cookie_how[how_indx] = 7; 1789 1790 return (NULL); 1791 } 1792 if (how_indx < sizeof(asoc->cookie_how)) 1793 asoc->cookie_how[how_indx] = 8; 1794 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1795 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1796 sctp_stop_all_cookie_timers(stcb); 1797 /* 1798 * since we did not send a HB make sure we don't double 1799 * things 1800 */ 1801 net->hb_responded = 1; 1802 if (stcb->asoc.sctp_autoclose_ticks && 1803 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1804 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1805 NULL); 1806 } 1807 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1808 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1809 1810 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1811 /* 1812 * Ok the peer probably discarded our data (if we 1813 * echoed a cookie+data). So anything on the 1814 * sent_queue should be marked for retransmit, we 1815 * may not get something to kick us so it COULD 1816 * still take a timeout to move these.. but it can't 1817 * hurt to mark them. 1818 */ 1819 struct sctp_tmit_chunk *chk; 1820 1821 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1822 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1823 chk->sent = SCTP_DATAGRAM_RESEND; 1824 sctp_flight_size_decrease(chk); 1825 sctp_total_flight_decrease(stcb, chk); 1826 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1827 spec_flag++; 1828 } 1829 } 1830 1831 } 1832 /* process the INIT info (peer's info) */ 1833 retval = sctp_process_init(init_cp, stcb); 1834 if (retval < 0) { 1835 if (how_indx < sizeof(asoc->cookie_how)) 1836 asoc->cookie_how[how_indx] = 9; 1837 return (NULL); 1838 } 1839 if (sctp_load_addresses_from_init(stcb, m, 1840 init_offset + sizeof(struct sctp_init_chunk), 1841 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1842 if (how_indx < sizeof(asoc->cookie_how)) 1843 asoc->cookie_how[how_indx] = 10; 1844 return (NULL); 1845 } 1846 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1847 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1848 *notification = SCTP_NOTIFY_ASSOC_UP; 1849 1850 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1851 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1852 (!SCTP_IS_LISTENING(inp))) { 1853 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1854 struct socket *so; 1855 #endif 1856 stcb->sctp_ep->sctp_flags |= 1857 SCTP_PCB_FLAGS_CONNECTED; 1858 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1859 so = SCTP_INP_SO(stcb->sctp_ep); 1860 atomic_add_int(&stcb->asoc.refcnt, 1); 1861 SCTP_TCB_UNLOCK(stcb); 1862 SCTP_SOCKET_LOCK(so, 1); 1863 SCTP_TCB_LOCK(stcb); 1864 atomic_add_int(&stcb->asoc.refcnt, -1); 1865 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1866 SCTP_SOCKET_UNLOCK(so, 1); 1867 return (NULL); 1868 } 1869 #endif 1870 soisconnected(stcb->sctp_socket); 1871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1872 SCTP_SOCKET_UNLOCK(so, 1); 1873 #endif 1874 } 1875 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1876 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1877 else 1878 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1879 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1880 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1881 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1882 } else { 1883 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1884 } 1885 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1886 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1887 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1888 stcb->sctp_ep, stcb, NULL); 1889 } 1890 sctp_stop_all_cookie_timers(stcb); 1891 sctp_toss_old_cookies(stcb, asoc); 1892 sctp_send_cookie_ack(stcb); 1893 if (spec_flag) { 1894 /* 1895 * only if we have retrans set do we do this. What 1896 * this call does is get only the COOKIE-ACK out and 1897 * then when we return the normal call to 1898 * sctp_chunk_output will get the retrans out behind 1899 * this. 1900 */ 1901 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1902 } 1903 if (how_indx < sizeof(asoc->cookie_how)) 1904 asoc->cookie_how[how_indx] = 11; 1905 1906 return (stcb); 1907 } 1908 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1909 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1910 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1911 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1912 cookie->tie_tag_peer_vtag != 0) { 1913 struct sctpasochead *head; 1914 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1915 struct socket *so; 1916 #endif 1917 1918 if (asoc->peer_supports_nat) { 1919 /* 1920 * This is a gross gross hack. Just call the 1921 * cookie_new code since we are allowing a duplicate 1922 * association. I hope this works... 1923 */ 1924 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1925 sh, cookie, cookie_len, 1926 inp, netp, init_src, notification, 1927 auth_skipped, auth_offset, auth_len, 1928 mflowtype, mflowid, 1929 vrf_id, port)); 1930 } 1931 /* 1932 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1933 */ 1934 /* temp code */ 1935 if (how_indx < sizeof(asoc->cookie_how)) 1936 asoc->cookie_how[how_indx] = 12; 1937 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1938 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1939 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1940 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1941 1942 /* notify upper layer */ 1943 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1944 atomic_add_int(&stcb->asoc.refcnt, 1); 1945 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1946 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1947 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1948 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1949 } 1950 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1951 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1952 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1953 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1954 } 1955 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1956 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1957 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1958 stcb->sctp_ep, stcb, NULL); 1959 1960 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1961 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1962 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1963 } 1964 asoc->pre_open_streams = 1965 ntohs(initack_cp->init.num_outbound_streams); 1966 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1967 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1968 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1969 1970 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1971 1972 asoc->str_reset_seq_in = asoc->init_seq_number; 1973 1974 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1975 if (asoc->mapping_array) { 1976 memset(asoc->mapping_array, 0, 1977 asoc->mapping_array_size); 1978 } 1979 if (asoc->nr_mapping_array) { 1980 memset(asoc->nr_mapping_array, 0, 1981 asoc->mapping_array_size); 1982 } 1983 SCTP_TCB_UNLOCK(stcb); 1984 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1985 so = SCTP_INP_SO(stcb->sctp_ep); 1986 SCTP_SOCKET_LOCK(so, 1); 1987 #endif 1988 SCTP_INP_INFO_WLOCK(); 1989 SCTP_INP_WLOCK(stcb->sctp_ep); 1990 SCTP_TCB_LOCK(stcb); 1991 atomic_add_int(&stcb->asoc.refcnt, -1); 1992 /* send up all the data */ 1993 SCTP_TCB_SEND_LOCK(stcb); 1994 1995 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1996 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1997 stcb->asoc.strmout[i].chunks_on_queues = 0; 1998 #if defined(SCTP_DETAILED_STR_STATS) 1999 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 2000 asoc->strmout[i].abandoned_sent[j] = 0; 2001 asoc->strmout[i].abandoned_unsent[j] = 0; 2002 } 2003 #else 2004 asoc->strmout[i].abandoned_sent[0] = 0; 2005 asoc->strmout[i].abandoned_unsent[0] = 0; 2006 #endif 2007 stcb->asoc.strmout[i].sid = i; 2008 stcb->asoc.strmout[i].next_mid_ordered = 0; 2009 stcb->asoc.strmout[i].next_mid_unordered = 0; 2010 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2011 } 2012 /* process the INIT-ACK info (my info) */ 2013 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2014 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2015 2016 /* pull from vtag hash */ 2017 LIST_REMOVE(stcb, sctp_asocs); 2018 /* re-insert to new vtag position */ 2019 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2020 SCTP_BASE_INFO(hashasocmark))]; 2021 /* 2022 * put it in the bucket in the vtag hash of assoc's for the 2023 * system 2024 */ 2025 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2026 2027 SCTP_TCB_SEND_UNLOCK(stcb); 2028 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2029 SCTP_INP_INFO_WUNLOCK(); 2030 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2031 SCTP_SOCKET_UNLOCK(so, 1); 2032 #endif 2033 asoc->total_flight = 0; 2034 asoc->total_flight_count = 0; 2035 /* process the INIT info (peer's info) */ 2036 retval = sctp_process_init(init_cp, stcb); 2037 if (retval < 0) { 2038 if (how_indx < sizeof(asoc->cookie_how)) 2039 asoc->cookie_how[how_indx] = 13; 2040 2041 return (NULL); 2042 } 2043 /* 2044 * since we did not send a HB make sure we don't double 2045 * things 2046 */ 2047 net->hb_responded = 1; 2048 2049 if (sctp_load_addresses_from_init(stcb, m, 2050 init_offset + sizeof(struct sctp_init_chunk), 2051 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2052 if (how_indx < sizeof(asoc->cookie_how)) 2053 asoc->cookie_how[how_indx] = 14; 2054 2055 return (NULL); 2056 } 2057 /* respond with a COOKIE-ACK */ 2058 sctp_stop_all_cookie_timers(stcb); 2059 sctp_toss_old_cookies(stcb, asoc); 2060 sctp_send_cookie_ack(stcb); 2061 if (how_indx < sizeof(asoc->cookie_how)) 2062 asoc->cookie_how[how_indx] = 15; 2063 2064 return (stcb); 2065 } 2066 if (how_indx < sizeof(asoc->cookie_how)) 2067 asoc->cookie_how[how_indx] = 16; 2068 /* all other cases... */ 2069 return (NULL); 2070 } 2071 2072 2073 /* 2074 * handle a state cookie for a new association m: input packet mbuf chain-- 2075 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2076 * and the cookie signature does not exist offset: offset into mbuf to the 2077 * cookie-echo chunk length: length of the cookie chunk to: where the init 2078 * was from returns a new TCB 2079 */ 2080 static struct sctp_tcb * 2081 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2082 struct sockaddr *src, struct sockaddr *dst, 2083 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2084 struct sctp_inpcb *inp, struct sctp_nets **netp, 2085 struct sockaddr *init_src, int *notification, 2086 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2087 uint8_t mflowtype, uint32_t mflowid, 2088 uint32_t vrf_id, uint16_t port) 2089 { 2090 struct sctp_tcb *stcb; 2091 struct sctp_init_chunk *init_cp, init_buf; 2092 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2093 union sctp_sockstore store; 2094 struct sctp_association *asoc; 2095 int init_offset, initack_offset, initack_limit; 2096 int retval; 2097 int error = 0; 2098 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2099 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2100 struct socket *so; 2101 2102 so = SCTP_INP_SO(inp); 2103 #endif 2104 2105 /* 2106 * find and validate the INIT chunk in the cookie (peer's info) the 2107 * INIT should start after the cookie-echo header struct (chunk 2108 * header, state cookie header struct) 2109 */ 2110 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2111 init_cp = (struct sctp_init_chunk *) 2112 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2113 (uint8_t *)&init_buf); 2114 if (init_cp == NULL) { 2115 /* could not pull a INIT chunk in cookie */ 2116 SCTPDBG(SCTP_DEBUG_INPUT1, 2117 "process_cookie_new: could not pull INIT chunk hdr\n"); 2118 return (NULL); 2119 } 2120 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2121 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2122 return (NULL); 2123 } 2124 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2125 /* 2126 * find and validate the INIT-ACK chunk in the cookie (my info) the 2127 * INIT-ACK follows the INIT chunk 2128 */ 2129 initack_cp = (struct sctp_init_ack_chunk *) 2130 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2131 (uint8_t *)&initack_buf); 2132 if (initack_cp == NULL) { 2133 /* could not pull INIT-ACK chunk in cookie */ 2134 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2135 return (NULL); 2136 } 2137 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2138 return (NULL); 2139 } 2140 /* 2141 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2142 * "initack_limit" value. This is because the chk_length field 2143 * includes the length of the cookie, but the cookie is omitted when 2144 * the INIT and INIT_ACK are tacked onto the cookie... 2145 */ 2146 initack_limit = offset + cookie_len; 2147 2148 /* 2149 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2150 * and popluate 2151 */ 2152 2153 /* 2154 * Here we do a trick, we set in NULL for the proc/thread argument. 2155 * We do this since in effect we only use the p argument when the 2156 * socket is unbound and we must do an implicit bind. Since we are 2157 * getting a cookie, we cannot be unbound. 2158 */ 2159 stcb = sctp_aloc_assoc(inp, init_src, &error, 2160 ntohl(initack_cp->init.initiate_tag), vrf_id, 2161 ntohs(initack_cp->init.num_outbound_streams), 2162 port, 2163 (struct thread *)NULL, 2164 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2165 if (stcb == NULL) { 2166 struct mbuf *op_err; 2167 2168 /* memory problem? */ 2169 SCTPDBG(SCTP_DEBUG_INPUT1, 2170 "process_cookie_new: no room for another TCB!\n"); 2171 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2172 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2173 src, dst, sh, op_err, 2174 mflowtype, mflowid, 2175 vrf_id, port); 2176 return (NULL); 2177 } 2178 /* get the correct sctp_nets */ 2179 if (netp) 2180 *netp = sctp_findnet(stcb, init_src); 2181 2182 asoc = &stcb->asoc; 2183 /* get scope variables out of cookie */ 2184 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2185 asoc->scope.site_scope = cookie->site_scope; 2186 asoc->scope.local_scope = cookie->local_scope; 2187 asoc->scope.loopback_scope = cookie->loopback_scope; 2188 2189 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2190 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2191 struct mbuf *op_err; 2192 2193 /* 2194 * Houston we have a problem. The EP changed while the 2195 * cookie was in flight. Only recourse is to abort the 2196 * association. 2197 */ 2198 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2199 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2200 src, dst, sh, op_err, 2201 mflowtype, mflowid, 2202 vrf_id, port); 2203 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2204 atomic_add_int(&stcb->asoc.refcnt, 1); 2205 SCTP_TCB_UNLOCK(stcb); 2206 SCTP_SOCKET_LOCK(so, 1); 2207 SCTP_TCB_LOCK(stcb); 2208 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2209 #endif 2210 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2211 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2212 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2213 SCTP_SOCKET_UNLOCK(so, 1); 2214 #endif 2215 return (NULL); 2216 } 2217 /* process the INIT-ACK info (my info) */ 2218 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2219 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2220 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2221 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2222 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2223 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2224 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2225 asoc->str_reset_seq_in = asoc->init_seq_number; 2226 2227 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2228 2229 /* process the INIT info (peer's info) */ 2230 if (netp) 2231 retval = sctp_process_init(init_cp, stcb); 2232 else 2233 retval = 0; 2234 if (retval < 0) { 2235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2236 atomic_add_int(&stcb->asoc.refcnt, 1); 2237 SCTP_TCB_UNLOCK(stcb); 2238 SCTP_SOCKET_LOCK(so, 1); 2239 SCTP_TCB_LOCK(stcb); 2240 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2241 #endif 2242 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2243 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2244 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2245 SCTP_SOCKET_UNLOCK(so, 1); 2246 #endif 2247 return (NULL); 2248 } 2249 /* load all addresses */ 2250 if (sctp_load_addresses_from_init(stcb, m, 2251 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2252 src, dst, init_src, port)) { 2253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2254 atomic_add_int(&stcb->asoc.refcnt, 1); 2255 SCTP_TCB_UNLOCK(stcb); 2256 SCTP_SOCKET_LOCK(so, 1); 2257 SCTP_TCB_LOCK(stcb); 2258 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2259 #endif 2260 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2261 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2262 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2263 SCTP_SOCKET_UNLOCK(so, 1); 2264 #endif 2265 return (NULL); 2266 } 2267 /* 2268 * verify any preceding AUTH chunk that was skipped 2269 */ 2270 /* pull the local authentication parameters from the cookie/init-ack */ 2271 sctp_auth_get_cookie_params(stcb, m, 2272 initack_offset + sizeof(struct sctp_init_ack_chunk), 2273 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2274 if (auth_skipped) { 2275 struct sctp_auth_chunk *auth; 2276 2277 auth = (struct sctp_auth_chunk *) 2278 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2279 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2280 /* auth HMAC failed, dump the assoc and packet */ 2281 SCTPDBG(SCTP_DEBUG_AUTH1, 2282 "COOKIE-ECHO: AUTH failed\n"); 2283 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2284 atomic_add_int(&stcb->asoc.refcnt, 1); 2285 SCTP_TCB_UNLOCK(stcb); 2286 SCTP_SOCKET_LOCK(so, 1); 2287 SCTP_TCB_LOCK(stcb); 2288 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2289 #endif 2290 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2291 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2293 SCTP_SOCKET_UNLOCK(so, 1); 2294 #endif 2295 return (NULL); 2296 } else { 2297 /* remaining chunks checked... good to go */ 2298 stcb->asoc.authenticated = 1; 2299 } 2300 } 2301 2302 /* 2303 * if we're doing ASCONFs, check to see if we have any new local 2304 * addresses that need to get added to the peer (eg. addresses 2305 * changed while cookie echo in flight). This needs to be done 2306 * after we go to the OPEN state to do the correct asconf 2307 * processing. else, make sure we have the correct addresses in our 2308 * lists 2309 */ 2310 2311 /* warning, we re-use sin, sin6, sa_store here! */ 2312 /* pull in local_address (our "from" address) */ 2313 switch (cookie->laddr_type) { 2314 #ifdef INET 2315 case SCTP_IPV4_ADDRESS: 2316 /* source addr is IPv4 */ 2317 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2318 store.sin.sin_family = AF_INET; 2319 store.sin.sin_len = sizeof(struct sockaddr_in); 2320 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2321 break; 2322 #endif 2323 #ifdef INET6 2324 case SCTP_IPV6_ADDRESS: 2325 /* source addr is IPv6 */ 2326 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2327 store.sin6.sin6_family = AF_INET6; 2328 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2329 store.sin6.sin6_scope_id = cookie->scope_id; 2330 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2331 break; 2332 #endif 2333 default: 2334 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2335 atomic_add_int(&stcb->asoc.refcnt, 1); 2336 SCTP_TCB_UNLOCK(stcb); 2337 SCTP_SOCKET_LOCK(so, 1); 2338 SCTP_TCB_LOCK(stcb); 2339 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2340 #endif 2341 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2342 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2343 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2344 SCTP_SOCKET_UNLOCK(so, 1); 2345 #endif 2346 return (NULL); 2347 } 2348 2349 /* update current state */ 2350 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2351 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2352 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2353 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2354 stcb->sctp_ep, stcb, NULL); 2355 } 2356 sctp_stop_all_cookie_timers(stcb); 2357 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2358 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2359 2360 /* set up to notify upper layer */ 2361 *notification = SCTP_NOTIFY_ASSOC_UP; 2362 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2363 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2364 (!SCTP_IS_LISTENING(inp))) { 2365 /* 2366 * This is an endpoint that called connect() how it got a 2367 * cookie that is NEW is a bit of a mystery. It must be that 2368 * the INIT was sent, but before it got there.. a complete 2369 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2370 * should have went to the other code.. not here.. oh well.. 2371 * a bit of protection is worth having.. 2372 */ 2373 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2374 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2375 atomic_add_int(&stcb->asoc.refcnt, 1); 2376 SCTP_TCB_UNLOCK(stcb); 2377 SCTP_SOCKET_LOCK(so, 1); 2378 SCTP_TCB_LOCK(stcb); 2379 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2380 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2381 SCTP_SOCKET_UNLOCK(so, 1); 2382 return (NULL); 2383 } 2384 #endif 2385 soisconnected(stcb->sctp_socket); 2386 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2387 SCTP_SOCKET_UNLOCK(so, 1); 2388 #endif 2389 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2390 (SCTP_IS_LISTENING(inp))) { 2391 /* 2392 * We don't want to do anything with this one. Since it is 2393 * the listening guy. The timer will get started for 2394 * accepted connections in the caller. 2395 */ 2396 ; 2397 } 2398 /* since we did not send a HB make sure we don't double things */ 2399 if ((netp) && (*netp)) 2400 (*netp)->hb_responded = 1; 2401 2402 if (stcb->asoc.sctp_autoclose_ticks && 2403 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2404 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2405 } 2406 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2407 if ((netp != NULL) && (*netp != NULL)) { 2408 struct timeval old; 2409 2410 /* calculate the RTT and set the encaps port */ 2411 old.tv_sec = cookie->time_entered.tv_sec; 2412 old.tv_usec = cookie->time_entered.tv_usec; 2413 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2414 } 2415 /* respond with a COOKIE-ACK */ 2416 sctp_send_cookie_ack(stcb); 2417 2418 /* 2419 * check the address lists for any ASCONFs that need to be sent 2420 * AFTER the cookie-ack is sent 2421 */ 2422 sctp_check_address_list(stcb, m, 2423 initack_offset + sizeof(struct sctp_init_ack_chunk), 2424 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2425 &store.sa, cookie->local_scope, cookie->site_scope, 2426 cookie->ipv4_scope, cookie->loopback_scope); 2427 2428 2429 return (stcb); 2430 } 2431 2432 /* 2433 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2434 * we NEED to make sure we are not already using the vtag. If so we 2435 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2436 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2437 SCTP_BASE_INFO(hashasocmark))]; 2438 LIST_FOREACH(stcb, head, sctp_asocs) { 2439 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2440 -- SEND ABORT - TRY AGAIN -- 2441 } 2442 } 2443 */ 2444 2445 /* 2446 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2447 * existing (non-NULL) TCB 2448 */ 2449 static struct mbuf * 2450 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2451 struct sockaddr *src, struct sockaddr *dst, 2452 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2453 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2454 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2455 struct sctp_tcb **locked_tcb, 2456 uint8_t mflowtype, uint32_t mflowid, 2457 uint32_t vrf_id, uint16_t port) 2458 { 2459 struct sctp_state_cookie *cookie; 2460 struct sctp_tcb *l_stcb = *stcb; 2461 struct sctp_inpcb *l_inp; 2462 struct sockaddr *to; 2463 struct sctp_pcb *ep; 2464 struct mbuf *m_sig; 2465 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2466 uint8_t *sig; 2467 uint8_t cookie_ok = 0; 2468 unsigned int sig_offset, cookie_offset; 2469 unsigned int cookie_len; 2470 struct timeval now; 2471 struct timeval time_expires; 2472 int notification = 0; 2473 struct sctp_nets *netl; 2474 int had_a_existing_tcb = 0; 2475 int send_int_conf = 0; 2476 #ifdef INET 2477 struct sockaddr_in sin; 2478 #endif 2479 #ifdef INET6 2480 struct sockaddr_in6 sin6; 2481 #endif 2482 2483 SCTPDBG(SCTP_DEBUG_INPUT2, 2484 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2485 2486 if (inp_p == NULL) { 2487 return (NULL); 2488 } 2489 cookie = &cp->cookie; 2490 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2491 cookie_len = ntohs(cp->ch.chunk_length); 2492 2493 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2494 sizeof(struct sctp_init_chunk) + 2495 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2496 /* cookie too small */ 2497 return (NULL); 2498 } 2499 if ((cookie->peerport != sh->src_port) || 2500 (cookie->myport != sh->dest_port) || 2501 (cookie->my_vtag != sh->v_tag)) { 2502 /* 2503 * invalid ports or bad tag. Note that we always leave the 2504 * v_tag in the header in network order and when we stored 2505 * it in the my_vtag slot we also left it in network order. 2506 * This maintains the match even though it may be in the 2507 * opposite byte order of the machine :-> 2508 */ 2509 return (NULL); 2510 } 2511 /* 2512 * split off the signature into its own mbuf (since it should not be 2513 * calculated in the sctp_hmac_m() call). 2514 */ 2515 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2516 m_sig = m_split(m, sig_offset, M_NOWAIT); 2517 if (m_sig == NULL) { 2518 /* out of memory or ?? */ 2519 return (NULL); 2520 } 2521 #ifdef SCTP_MBUF_LOGGING 2522 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2523 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2524 } 2525 #endif 2526 2527 /* 2528 * compute the signature/digest for the cookie 2529 */ 2530 ep = &(*inp_p)->sctp_ep; 2531 l_inp = *inp_p; 2532 if (l_stcb) { 2533 SCTP_TCB_UNLOCK(l_stcb); 2534 } 2535 SCTP_INP_RLOCK(l_inp); 2536 if (l_stcb) { 2537 SCTP_TCB_LOCK(l_stcb); 2538 } 2539 /* which cookie is it? */ 2540 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2541 (ep->current_secret_number != ep->last_secret_number)) { 2542 /* it's the old cookie */ 2543 (void)sctp_hmac_m(SCTP_HMAC, 2544 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2545 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2546 } else { 2547 /* it's the current cookie */ 2548 (void)sctp_hmac_m(SCTP_HMAC, 2549 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2550 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2551 } 2552 /* get the signature */ 2553 SCTP_INP_RUNLOCK(l_inp); 2554 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2555 if (sig == NULL) { 2556 /* couldn't find signature */ 2557 sctp_m_freem(m_sig); 2558 return (NULL); 2559 } 2560 /* compare the received digest with the computed digest */ 2561 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2562 /* try the old cookie? */ 2563 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2564 (ep->current_secret_number != ep->last_secret_number)) { 2565 /* compute digest with old */ 2566 (void)sctp_hmac_m(SCTP_HMAC, 2567 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2568 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2569 /* compare */ 2570 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2571 cookie_ok = 1; 2572 } 2573 } else { 2574 cookie_ok = 1; 2575 } 2576 2577 /* 2578 * Now before we continue we must reconstruct our mbuf so that 2579 * normal processing of any other chunks will work. 2580 */ 2581 { 2582 struct mbuf *m_at; 2583 2584 m_at = m; 2585 while (SCTP_BUF_NEXT(m_at) != NULL) { 2586 m_at = SCTP_BUF_NEXT(m_at); 2587 } 2588 SCTP_BUF_NEXT(m_at) = m_sig; 2589 } 2590 2591 if (cookie_ok == 0) { 2592 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2593 SCTPDBG(SCTP_DEBUG_INPUT2, 2594 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2595 (uint32_t)offset, cookie_offset, sig_offset); 2596 return (NULL); 2597 } 2598 2599 /* 2600 * check the cookie timestamps to be sure it's not stale 2601 */ 2602 (void)SCTP_GETTIME_TIMEVAL(&now); 2603 /* Expire time is in Ticks, so we convert to seconds */ 2604 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2605 time_expires.tv_usec = cookie->time_entered.tv_usec; 2606 if (timevalcmp(&now, &time_expires, >)) { 2607 /* cookie is stale! */ 2608 struct mbuf *op_err; 2609 struct sctp_error_stale_cookie *cause; 2610 struct timeval diff; 2611 uint32_t staleness; 2612 2613 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2614 0, M_NOWAIT, 1, MT_DATA); 2615 if (op_err == NULL) { 2616 /* FOOBAR */ 2617 return (NULL); 2618 } 2619 /* Set the len */ 2620 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2621 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2622 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2623 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2624 (sizeof(uint32_t)))); 2625 diff = now; 2626 timevalsub(&diff, &time_expires); 2627 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2628 staleness = UINT32_MAX; 2629 } else { 2630 staleness = diff.tv_sec * 1000000; 2631 } 2632 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2633 staleness += diff.tv_usec; 2634 } else { 2635 staleness = UINT32_MAX; 2636 } 2637 cause->stale_time = htonl(staleness); 2638 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2639 mflowtype, mflowid, l_inp->fibnum, 2640 vrf_id, port); 2641 return (NULL); 2642 } 2643 /* 2644 * Now we must see with the lookup address if we have an existing 2645 * asoc. This will only happen if we were in the COOKIE-WAIT state 2646 * and a INIT collided with us and somewhere the peer sent the 2647 * cookie on another address besides the single address our assoc 2648 * had for him. In this case we will have one of the tie-tags set at 2649 * least AND the address field in the cookie can be used to look it 2650 * up. 2651 */ 2652 to = NULL; 2653 switch (cookie->addr_type) { 2654 #ifdef INET6 2655 case SCTP_IPV6_ADDRESS: 2656 memset(&sin6, 0, sizeof(sin6)); 2657 sin6.sin6_family = AF_INET6; 2658 sin6.sin6_len = sizeof(sin6); 2659 sin6.sin6_port = sh->src_port; 2660 sin6.sin6_scope_id = cookie->scope_id; 2661 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2662 sizeof(sin6.sin6_addr.s6_addr)); 2663 to = (struct sockaddr *)&sin6; 2664 break; 2665 #endif 2666 #ifdef INET 2667 case SCTP_IPV4_ADDRESS: 2668 memset(&sin, 0, sizeof(sin)); 2669 sin.sin_family = AF_INET; 2670 sin.sin_len = sizeof(sin); 2671 sin.sin_port = sh->src_port; 2672 sin.sin_addr.s_addr = cookie->address[0]; 2673 to = (struct sockaddr *)&sin; 2674 break; 2675 #endif 2676 default: 2677 /* This should not happen */ 2678 return (NULL); 2679 } 2680 if (*stcb == NULL) { 2681 /* Yep, lets check */ 2682 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2683 if (*stcb == NULL) { 2684 /* 2685 * We should have only got back the same inp. If we 2686 * got back a different ep we have a problem. The 2687 * original findep got back l_inp and now 2688 */ 2689 if (l_inp != *inp_p) { 2690 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2691 } 2692 } else { 2693 if (*locked_tcb == NULL) { 2694 /* 2695 * In this case we found the assoc only 2696 * after we locked the create lock. This 2697 * means we are in a colliding case and we 2698 * must make sure that we unlock the tcb if 2699 * its one of the cases where we throw away 2700 * the incoming packets. 2701 */ 2702 *locked_tcb = *stcb; 2703 2704 /* 2705 * We must also increment the inp ref count 2706 * since the ref_count flags was set when we 2707 * did not find the TCB, now we found it 2708 * which reduces the refcount.. we must 2709 * raise it back out to balance it all :-) 2710 */ 2711 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2712 if ((*stcb)->sctp_ep != l_inp) { 2713 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2714 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2715 } 2716 } 2717 } 2718 } 2719 2720 cookie_len -= SCTP_SIGNATURE_SIZE; 2721 if (*stcb == NULL) { 2722 /* this is the "normal" case... get a new TCB */ 2723 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2724 cookie, cookie_len, *inp_p, 2725 netp, to, ¬ification, 2726 auth_skipped, auth_offset, auth_len, 2727 mflowtype, mflowid, 2728 vrf_id, port); 2729 } else { 2730 /* this is abnormal... cookie-echo on existing TCB */ 2731 had_a_existing_tcb = 1; 2732 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2733 src, dst, sh, 2734 cookie, cookie_len, *inp_p, *stcb, netp, to, 2735 ¬ification, auth_skipped, auth_offset, auth_len, 2736 mflowtype, mflowid, 2737 vrf_id, port); 2738 } 2739 2740 if (*stcb == NULL) { 2741 /* still no TCB... must be bad cookie-echo */ 2742 return (NULL); 2743 } 2744 if (*netp != NULL) { 2745 (*netp)->flowtype = mflowtype; 2746 (*netp)->flowid = mflowid; 2747 } 2748 /* 2749 * Ok, we built an association so confirm the address we sent the 2750 * INIT-ACK to. 2751 */ 2752 netl = sctp_findnet(*stcb, to); 2753 /* 2754 * This code should in theory NOT run but 2755 */ 2756 if (netl == NULL) { 2757 /* TSNH! Huh, why do I need to add this address here? */ 2758 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2759 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2760 return (NULL); 2761 } 2762 netl = sctp_findnet(*stcb, to); 2763 } 2764 if (netl) { 2765 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2766 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2767 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2768 netl); 2769 send_int_conf = 1; 2770 } 2771 } 2772 sctp_start_net_timers(*stcb); 2773 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2774 if (!had_a_existing_tcb || 2775 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2776 /* 2777 * If we have a NEW cookie or the connect never 2778 * reached the connected state during collision we 2779 * must do the TCP accept thing. 2780 */ 2781 struct socket *so, *oso; 2782 struct sctp_inpcb *inp; 2783 2784 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2785 /* 2786 * For a restart we will keep the same 2787 * socket, no need to do anything. I THINK!! 2788 */ 2789 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2790 if (send_int_conf) { 2791 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2792 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2793 } 2794 return (m); 2795 } 2796 oso = (*inp_p)->sctp_socket; 2797 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2798 SCTP_TCB_UNLOCK((*stcb)); 2799 CURVNET_SET(oso->so_vnet); 2800 so = sonewconn(oso, 0 2801 ); 2802 CURVNET_RESTORE(); 2803 SCTP_TCB_LOCK((*stcb)); 2804 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2805 2806 if (so == NULL) { 2807 struct mbuf *op_err; 2808 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2809 struct socket *pcb_so; 2810 #endif 2811 /* Too many sockets */ 2812 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2813 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2814 sctp_abort_association(*inp_p, NULL, m, iphlen, 2815 src, dst, sh, op_err, 2816 mflowtype, mflowid, 2817 vrf_id, port); 2818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2819 pcb_so = SCTP_INP_SO(*inp_p); 2820 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2821 SCTP_TCB_UNLOCK((*stcb)); 2822 SCTP_SOCKET_LOCK(pcb_so, 1); 2823 SCTP_TCB_LOCK((*stcb)); 2824 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2825 #endif 2826 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2827 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2828 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2829 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2830 #endif 2831 return (NULL); 2832 } 2833 inp = (struct sctp_inpcb *)so->so_pcb; 2834 SCTP_INP_INCR_REF(inp); 2835 /* 2836 * We add the unbound flag here so that if we get an 2837 * soabort() before we get the move_pcb done, we 2838 * will properly cleanup. 2839 */ 2840 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2841 SCTP_PCB_FLAGS_CONNECTED | 2842 SCTP_PCB_FLAGS_IN_TCPPOOL | 2843 SCTP_PCB_FLAGS_UNBOUND | 2844 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2845 SCTP_PCB_FLAGS_DONT_WAKE); 2846 inp->sctp_features = (*inp_p)->sctp_features; 2847 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2848 inp->sctp_socket = so; 2849 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2850 inp->max_cwnd = (*inp_p)->max_cwnd; 2851 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2852 inp->ecn_supported = (*inp_p)->ecn_supported; 2853 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2854 inp->auth_supported = (*inp_p)->auth_supported; 2855 inp->asconf_supported = (*inp_p)->asconf_supported; 2856 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2857 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2858 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2859 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2860 inp->sctp_context = (*inp_p)->sctp_context; 2861 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2862 inp->fibnum = (*inp_p)->fibnum; 2863 inp->inp_starting_point_for_iterator = NULL; 2864 /* 2865 * copy in the authentication parameters from the 2866 * original endpoint 2867 */ 2868 if (inp->sctp_ep.local_hmacs) 2869 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2870 inp->sctp_ep.local_hmacs = 2871 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2872 if (inp->sctp_ep.local_auth_chunks) 2873 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2874 inp->sctp_ep.local_auth_chunks = 2875 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2876 2877 /* 2878 * Now we must move it from one hash table to 2879 * another and get the tcb in the right place. 2880 */ 2881 2882 /* 2883 * This is where the one-2-one socket is put into 2884 * the accept state waiting for the accept! 2885 */ 2886 if (*stcb) { 2887 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2888 } 2889 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2890 2891 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2892 SCTP_TCB_UNLOCK((*stcb)); 2893 2894 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2895 0); 2896 SCTP_TCB_LOCK((*stcb)); 2897 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2898 2899 2900 /* 2901 * now we must check to see if we were aborted while 2902 * the move was going on and the lock/unlock 2903 * happened. 2904 */ 2905 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2906 /* 2907 * yep it was, we leave the assoc attached 2908 * to the socket since the sctp_inpcb_free() 2909 * call will send an abort for us. 2910 */ 2911 SCTP_INP_DECR_REF(inp); 2912 return (NULL); 2913 } 2914 SCTP_INP_DECR_REF(inp); 2915 /* Switch over to the new guy */ 2916 *inp_p = inp; 2917 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2918 if (send_int_conf) { 2919 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2920 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2921 } 2922 2923 /* 2924 * Pull it from the incomplete queue and wake the 2925 * guy 2926 */ 2927 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2928 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2929 SCTP_TCB_UNLOCK((*stcb)); 2930 SCTP_SOCKET_LOCK(so, 1); 2931 #endif 2932 soisconnected(so); 2933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2934 SCTP_TCB_LOCK((*stcb)); 2935 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2936 SCTP_SOCKET_UNLOCK(so, 1); 2937 #endif 2938 return (m); 2939 } 2940 } 2941 if (notification) { 2942 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2943 } 2944 if (send_int_conf) { 2945 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2946 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2947 } 2948 return (m); 2949 } 2950 2951 static void 2952 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2953 struct sctp_tcb *stcb, struct sctp_nets *net) 2954 { 2955 /* cp must not be used, others call this without a c-ack :-) */ 2956 struct sctp_association *asoc; 2957 2958 SCTPDBG(SCTP_DEBUG_INPUT2, 2959 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2960 if ((stcb == NULL) || (net == NULL)) { 2961 return; 2962 } 2963 2964 asoc = &stcb->asoc; 2965 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2966 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2967 asoc->overall_error_count, 2968 0, 2969 SCTP_FROM_SCTP_INPUT, 2970 __LINE__); 2971 } 2972 asoc->overall_error_count = 0; 2973 sctp_stop_all_cookie_timers(stcb); 2974 /* process according to association state */ 2975 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2976 /* state change only needed when I am in right state */ 2977 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2978 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2979 sctp_start_net_timers(stcb); 2980 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2981 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2982 stcb->sctp_ep, stcb, NULL); 2983 2984 } 2985 /* update RTO */ 2986 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2987 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2988 if (asoc->overall_error_count == 0) { 2989 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2990 SCTP_RTT_FROM_NON_DATA); 2991 } 2992 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2993 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2994 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2995 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2996 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2997 struct socket *so; 2998 2999 #endif 3000 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 3001 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3002 so = SCTP_INP_SO(stcb->sctp_ep); 3003 atomic_add_int(&stcb->asoc.refcnt, 1); 3004 SCTP_TCB_UNLOCK(stcb); 3005 SCTP_SOCKET_LOCK(so, 1); 3006 SCTP_TCB_LOCK(stcb); 3007 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3008 #endif 3009 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3010 soisconnected(stcb->sctp_socket); 3011 } 3012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3013 SCTP_SOCKET_UNLOCK(so, 1); 3014 #endif 3015 } 3016 /* 3017 * since we did not send a HB make sure we don't double 3018 * things 3019 */ 3020 net->hb_responded = 1; 3021 3022 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3023 /* 3024 * We don't need to do the asconf thing, nor hb or 3025 * autoclose if the socket is closed. 3026 */ 3027 goto closed_socket; 3028 } 3029 3030 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3031 stcb, net); 3032 3033 3034 if (stcb->asoc.sctp_autoclose_ticks && 3035 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3036 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3037 stcb->sctp_ep, stcb, NULL); 3038 } 3039 /* 3040 * send ASCONF if parameters are pending and ASCONFs are 3041 * allowed (eg. addresses changed when init/cookie echo were 3042 * in flight) 3043 */ 3044 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3045 (stcb->asoc.asconf_supported == 1) && 3046 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3047 #ifdef SCTP_TIMER_BASED_ASCONF 3048 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3049 stcb->sctp_ep, stcb, 3050 stcb->asoc.primary_destination); 3051 #else 3052 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3053 SCTP_ADDR_NOT_LOCKED); 3054 #endif 3055 } 3056 } 3057 closed_socket: 3058 /* Toss the cookie if I can */ 3059 sctp_toss_old_cookies(stcb, asoc); 3060 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3061 /* Restart the timer if we have pending data */ 3062 struct sctp_tmit_chunk *chk; 3063 3064 chk = TAILQ_FIRST(&asoc->sent_queue); 3065 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3066 } 3067 } 3068 3069 static void 3070 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3071 struct sctp_tcb *stcb) 3072 { 3073 struct sctp_nets *net; 3074 struct sctp_tmit_chunk *lchk; 3075 struct sctp_ecne_chunk bkup; 3076 uint8_t override_bit; 3077 uint32_t tsn, window_data_tsn; 3078 int len; 3079 unsigned int pkt_cnt; 3080 3081 len = ntohs(cp->ch.chunk_length); 3082 if ((len != sizeof(struct sctp_ecne_chunk)) && 3083 (len != sizeof(struct old_sctp_ecne_chunk))) { 3084 return; 3085 } 3086 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3087 /* Its the old format */ 3088 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3089 bkup.num_pkts_since_cwr = htonl(1); 3090 cp = &bkup; 3091 } 3092 SCTP_STAT_INCR(sctps_recvecne); 3093 tsn = ntohl(cp->tsn); 3094 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3095 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3096 if (lchk == NULL) { 3097 window_data_tsn = stcb->asoc.sending_seq - 1; 3098 } else { 3099 window_data_tsn = lchk->rec.data.tsn; 3100 } 3101 3102 /* Find where it was sent to if possible. */ 3103 net = NULL; 3104 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3105 if (lchk->rec.data.tsn == tsn) { 3106 net = lchk->whoTo; 3107 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3108 break; 3109 } 3110 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3111 break; 3112 } 3113 } 3114 if (net == NULL) { 3115 /* 3116 * What to do. A previous send of a CWR was possibly lost. 3117 * See how old it is, we may have it marked on the actual 3118 * net. 3119 */ 3120 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3121 if (tsn == net->last_cwr_tsn) { 3122 /* Found him, send it off */ 3123 break; 3124 } 3125 } 3126 if (net == NULL) { 3127 /* 3128 * If we reach here, we need to send a special CWR 3129 * that says hey, we did this a long time ago and 3130 * you lost the response. 3131 */ 3132 net = TAILQ_FIRST(&stcb->asoc.nets); 3133 if (net == NULL) { 3134 /* TSNH */ 3135 return; 3136 } 3137 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3138 } else { 3139 override_bit = 0; 3140 } 3141 } else { 3142 override_bit = 0; 3143 } 3144 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3145 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3146 /* 3147 * JRS - Use the congestion control given in the pluggable 3148 * CC module 3149 */ 3150 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3151 /* 3152 * We reduce once every RTT. So we will only lower cwnd at 3153 * the next sending seq i.e. the window_data_tsn 3154 */ 3155 net->cwr_window_tsn = window_data_tsn; 3156 net->ecn_ce_pkt_cnt += pkt_cnt; 3157 net->lost_cnt = pkt_cnt; 3158 net->last_cwr_tsn = tsn; 3159 } else { 3160 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3161 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3162 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3163 /* 3164 * Another loss in the same window update how many 3165 * marks/packets lost we have had. 3166 */ 3167 int cnt = 1; 3168 3169 if (pkt_cnt > net->lost_cnt) { 3170 /* Should be the case */ 3171 cnt = (pkt_cnt - net->lost_cnt); 3172 net->ecn_ce_pkt_cnt += cnt; 3173 } 3174 net->lost_cnt = pkt_cnt; 3175 net->last_cwr_tsn = tsn; 3176 /* 3177 * Most CC functions will ignore this call, since we 3178 * are in-window yet of the initial CE the peer saw. 3179 */ 3180 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3181 } 3182 } 3183 /* 3184 * We always send a CWR this way if our previous one was lost our 3185 * peer will get an update, or if it is not time again to reduce we 3186 * still get the cwr to the peer. Note we set the override when we 3187 * could not find the TSN on the chunk or the destination network. 3188 */ 3189 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3190 } 3191 3192 static void 3193 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3194 { 3195 /* 3196 * Here we get a CWR from the peer. We must look in the outqueue and 3197 * make sure that we have a covered ECNE in the control chunk part. 3198 * If so remove it. 3199 */ 3200 struct sctp_tmit_chunk *chk, *nchk; 3201 struct sctp_ecne_chunk *ecne; 3202 int override; 3203 uint32_t cwr_tsn; 3204 3205 cwr_tsn = ntohl(cp->tsn); 3206 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3207 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3208 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3209 continue; 3210 } 3211 if ((override == 0) && (chk->whoTo != net)) { 3212 /* Must be from the right src unless override is set */ 3213 continue; 3214 } 3215 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3216 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3217 /* this covers this ECNE, we can remove it */ 3218 stcb->asoc.ecn_echo_cnt_onq--; 3219 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3220 sctp_next); 3221 stcb->asoc.ctrl_queue_cnt--; 3222 sctp_m_freem(chk->data); 3223 chk->data = NULL; 3224 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3225 if (override == 0) { 3226 break; 3227 } 3228 } 3229 } 3230 } 3231 3232 static void 3233 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3234 struct sctp_tcb *stcb, struct sctp_nets *net) 3235 { 3236 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3237 struct socket *so; 3238 #endif 3239 3240 SCTPDBG(SCTP_DEBUG_INPUT2, 3241 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3242 if (stcb == NULL) 3243 return; 3244 3245 /* process according to association state */ 3246 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3247 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3248 SCTPDBG(SCTP_DEBUG_INPUT2, 3249 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3250 SCTP_TCB_UNLOCK(stcb); 3251 return; 3252 } 3253 /* notify upper layer protocol */ 3254 if (stcb->sctp_socket) { 3255 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3256 } 3257 #ifdef INVARIANTS 3258 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3259 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3260 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3261 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3262 } 3263 #endif 3264 /* stop the timer */ 3265 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3266 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3267 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3268 /* free the TCB */ 3269 SCTPDBG(SCTP_DEBUG_INPUT2, 3270 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3271 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3272 so = SCTP_INP_SO(stcb->sctp_ep); 3273 atomic_add_int(&stcb->asoc.refcnt, 1); 3274 SCTP_TCB_UNLOCK(stcb); 3275 SCTP_SOCKET_LOCK(so, 1); 3276 SCTP_TCB_LOCK(stcb); 3277 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3278 #endif 3279 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3280 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3281 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3282 SCTP_SOCKET_UNLOCK(so, 1); 3283 #endif 3284 return; 3285 } 3286 3287 static int 3288 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3289 struct sctp_nets *net, uint8_t flg) 3290 { 3291 switch (desc->chunk_type) { 3292 case SCTP_DATA: 3293 /* find the tsn to resend (possibly */ 3294 { 3295 uint32_t tsn; 3296 struct sctp_tmit_chunk *tp1; 3297 3298 tsn = ntohl(desc->tsn_ifany); 3299 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3300 if (tp1->rec.data.tsn == tsn) { 3301 /* found it */ 3302 break; 3303 } 3304 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3305 /* not found */ 3306 tp1 = NULL; 3307 break; 3308 } 3309 } 3310 if (tp1 == NULL) { 3311 /* 3312 * Do it the other way , aka without paying 3313 * attention to queue seq order. 3314 */ 3315 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3316 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3317 if (tp1->rec.data.tsn == tsn) { 3318 /* found it */ 3319 break; 3320 } 3321 } 3322 } 3323 if (tp1 == NULL) { 3324 SCTP_STAT_INCR(sctps_pdrptsnnf); 3325 } 3326 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3327 uint8_t *ddp; 3328 3329 if (((flg & SCTP_BADCRC) == 0) && 3330 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3331 return (0); 3332 } 3333 if ((stcb->asoc.peers_rwnd == 0) && 3334 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3335 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3336 return (0); 3337 } 3338 if (stcb->asoc.peers_rwnd == 0 && 3339 (flg & SCTP_FROM_MIDDLE_BOX)) { 3340 SCTP_STAT_INCR(sctps_pdrpdizrw); 3341 return (0); 3342 } 3343 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3344 sizeof(struct sctp_data_chunk)); 3345 { 3346 unsigned int iii; 3347 3348 for (iii = 0; iii < sizeof(desc->data_bytes); 3349 iii++) { 3350 if (ddp[iii] != desc->data_bytes[iii]) { 3351 SCTP_STAT_INCR(sctps_pdrpbadd); 3352 return (-1); 3353 } 3354 } 3355 } 3356 3357 if (tp1->do_rtt) { 3358 /* 3359 * this guy had a RTO calculation 3360 * pending on it, cancel it 3361 */ 3362 if (tp1->whoTo->rto_needed == 0) { 3363 tp1->whoTo->rto_needed = 1; 3364 } 3365 tp1->do_rtt = 0; 3366 } 3367 SCTP_STAT_INCR(sctps_pdrpmark); 3368 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3369 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3370 /* 3371 * mark it as if we were doing a FR, since 3372 * we will be getting gap ack reports behind 3373 * the info from the router. 3374 */ 3375 tp1->rec.data.doing_fast_retransmit = 1; 3376 /* 3377 * mark the tsn with what sequences can 3378 * cause a new FR. 3379 */ 3380 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3381 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3382 } else { 3383 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3384 } 3385 3386 /* restart the timer */ 3387 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3388 stcb, tp1->whoTo, 3389 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3390 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3391 stcb, tp1->whoTo); 3392 3393 /* fix counts and things */ 3394 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3395 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3396 tp1->whoTo->flight_size, 3397 tp1->book_size, 3398 (uint32_t)(uintptr_t)stcb, 3399 tp1->rec.data.tsn); 3400 } 3401 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3402 sctp_flight_size_decrease(tp1); 3403 sctp_total_flight_decrease(stcb, tp1); 3404 } 3405 tp1->sent = SCTP_DATAGRAM_RESEND; 3406 } { 3407 /* audit code */ 3408 unsigned int audit; 3409 3410 audit = 0; 3411 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3412 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3413 audit++; 3414 } 3415 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3416 sctp_next) { 3417 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3418 audit++; 3419 } 3420 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3421 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3422 audit, stcb->asoc.sent_queue_retran_cnt); 3423 #ifndef SCTP_AUDITING_ENABLED 3424 stcb->asoc.sent_queue_retran_cnt = audit; 3425 #endif 3426 } 3427 } 3428 } 3429 break; 3430 case SCTP_ASCONF: 3431 { 3432 struct sctp_tmit_chunk *asconf; 3433 3434 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3435 sctp_next) { 3436 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3437 break; 3438 } 3439 } 3440 if (asconf) { 3441 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3442 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3443 asconf->sent = SCTP_DATAGRAM_RESEND; 3444 asconf->snd_count--; 3445 } 3446 } 3447 break; 3448 case SCTP_INITIATION: 3449 /* resend the INIT */ 3450 stcb->asoc.dropped_special_cnt++; 3451 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3452 /* 3453 * If we can get it in, in a few attempts we do 3454 * this, otherwise we let the timer fire. 3455 */ 3456 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3457 stcb, net, 3458 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3459 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3460 } 3461 break; 3462 case SCTP_SELECTIVE_ACK: 3463 case SCTP_NR_SELECTIVE_ACK: 3464 /* resend the sack */ 3465 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3466 break; 3467 case SCTP_HEARTBEAT_REQUEST: 3468 /* resend a demand HB */ 3469 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3470 /* 3471 * Only retransmit if we KNOW we wont destroy the 3472 * tcb 3473 */ 3474 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3475 } 3476 break; 3477 case SCTP_SHUTDOWN: 3478 sctp_send_shutdown(stcb, net); 3479 break; 3480 case SCTP_SHUTDOWN_ACK: 3481 sctp_send_shutdown_ack(stcb, net); 3482 break; 3483 case SCTP_COOKIE_ECHO: 3484 { 3485 struct sctp_tmit_chunk *cookie; 3486 3487 cookie = NULL; 3488 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3489 sctp_next) { 3490 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3491 break; 3492 } 3493 } 3494 if (cookie) { 3495 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3496 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3497 cookie->sent = SCTP_DATAGRAM_RESEND; 3498 sctp_stop_all_cookie_timers(stcb); 3499 } 3500 } 3501 break; 3502 case SCTP_COOKIE_ACK: 3503 sctp_send_cookie_ack(stcb); 3504 break; 3505 case SCTP_ASCONF_ACK: 3506 /* resend last asconf ack */ 3507 sctp_send_asconf_ack(stcb); 3508 break; 3509 case SCTP_IFORWARD_CUM_TSN: 3510 case SCTP_FORWARD_CUM_TSN: 3511 send_forward_tsn(stcb, &stcb->asoc); 3512 break; 3513 /* can't do anything with these */ 3514 case SCTP_PACKET_DROPPED: 3515 case SCTP_INITIATION_ACK: /* this should not happen */ 3516 case SCTP_HEARTBEAT_ACK: 3517 case SCTP_ABORT_ASSOCIATION: 3518 case SCTP_OPERATION_ERROR: 3519 case SCTP_SHUTDOWN_COMPLETE: 3520 case SCTP_ECN_ECHO: 3521 case SCTP_ECN_CWR: 3522 default: 3523 break; 3524 } 3525 return (0); 3526 } 3527 3528 void 3529 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3530 { 3531 uint32_t i; 3532 uint16_t temp; 3533 3534 /* 3535 * We set things to 0xffffffff since this is the last delivered 3536 * sequence and we will be sending in 0 after the reset. 3537 */ 3538 3539 if (number_entries) { 3540 for (i = 0; i < number_entries; i++) { 3541 temp = ntohs(list[i]); 3542 if (temp >= stcb->asoc.streamincnt) { 3543 continue; 3544 } 3545 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3546 } 3547 } else { 3548 list = NULL; 3549 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3550 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3551 } 3552 } 3553 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3554 } 3555 3556 static void 3557 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3558 { 3559 uint32_t i; 3560 uint16_t temp; 3561 3562 if (number_entries > 0) { 3563 for (i = 0; i < number_entries; i++) { 3564 temp = ntohs(list[i]); 3565 if (temp >= stcb->asoc.streamoutcnt) { 3566 /* no such stream */ 3567 continue; 3568 } 3569 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3570 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3571 } 3572 } else { 3573 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3574 stcb->asoc.strmout[i].next_mid_ordered = 0; 3575 stcb->asoc.strmout[i].next_mid_unordered = 0; 3576 } 3577 } 3578 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3579 } 3580 3581 static void 3582 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3583 { 3584 uint32_t i; 3585 uint16_t temp; 3586 3587 if (number_entries > 0) { 3588 for (i = 0; i < number_entries; i++) { 3589 temp = ntohs(list[i]); 3590 if (temp >= stcb->asoc.streamoutcnt) { 3591 /* no such stream */ 3592 continue; 3593 } 3594 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3595 } 3596 } else { 3597 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3598 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3599 } 3600 } 3601 } 3602 3603 3604 struct sctp_stream_reset_request * 3605 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3606 { 3607 struct sctp_association *asoc; 3608 struct sctp_chunkhdr *ch; 3609 struct sctp_stream_reset_request *r; 3610 struct sctp_tmit_chunk *chk; 3611 int len, clen; 3612 3613 asoc = &stcb->asoc; 3614 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3615 asoc->stream_reset_outstanding = 0; 3616 return (NULL); 3617 } 3618 if (stcb->asoc.str_reset == NULL) { 3619 asoc->stream_reset_outstanding = 0; 3620 return (NULL); 3621 } 3622 chk = stcb->asoc.str_reset; 3623 if (chk->data == NULL) { 3624 return (NULL); 3625 } 3626 if (bchk) { 3627 /* he wants a copy of the chk pointer */ 3628 *bchk = chk; 3629 } 3630 clen = chk->send_size; 3631 ch = mtod(chk->data, struct sctp_chunkhdr *); 3632 r = (struct sctp_stream_reset_request *)(ch + 1); 3633 if (ntohl(r->request_seq) == seq) { 3634 /* found it */ 3635 return (r); 3636 } 3637 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3638 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3639 /* move to the next one, there can only be a max of two */ 3640 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3641 if (ntohl(r->request_seq) == seq) { 3642 return (r); 3643 } 3644 } 3645 /* that seq is not here */ 3646 return (NULL); 3647 } 3648 3649 static void 3650 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3651 { 3652 struct sctp_association *asoc; 3653 struct sctp_tmit_chunk *chk; 3654 3655 asoc = &stcb->asoc; 3656 chk = asoc->str_reset; 3657 if (chk == NULL) { 3658 return; 3659 } 3660 asoc->str_reset = NULL; 3661 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3662 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3663 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3664 asoc->ctrl_queue_cnt--; 3665 if (chk->data) { 3666 sctp_m_freem(chk->data); 3667 chk->data = NULL; 3668 } 3669 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3670 } 3671 3672 3673 static int 3674 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3675 uint32_t seq, uint32_t action, 3676 struct sctp_stream_reset_response *respin) 3677 { 3678 uint16_t type; 3679 int lparam_len; 3680 struct sctp_association *asoc = &stcb->asoc; 3681 struct sctp_tmit_chunk *chk; 3682 struct sctp_stream_reset_request *req_param; 3683 struct sctp_stream_reset_out_request *req_out_param; 3684 struct sctp_stream_reset_in_request *req_in_param; 3685 uint32_t number_entries; 3686 3687 if (asoc->stream_reset_outstanding == 0) { 3688 /* duplicate */ 3689 return (0); 3690 } 3691 if (seq == stcb->asoc.str_reset_seq_out) { 3692 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3693 if (req_param != NULL) { 3694 stcb->asoc.str_reset_seq_out++; 3695 type = ntohs(req_param->ph.param_type); 3696 lparam_len = ntohs(req_param->ph.param_length); 3697 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3698 int no_clear = 0; 3699 3700 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3701 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3702 asoc->stream_reset_out_is_outstanding = 0; 3703 if (asoc->stream_reset_outstanding) 3704 asoc->stream_reset_outstanding--; 3705 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3706 /* do it */ 3707 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3708 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3709 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3710 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3711 /* 3712 * Set it up so we don't stop 3713 * retransmitting 3714 */ 3715 asoc->stream_reset_outstanding++; 3716 stcb->asoc.str_reset_seq_out--; 3717 asoc->stream_reset_out_is_outstanding = 1; 3718 no_clear = 1; 3719 } else { 3720 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3721 } 3722 if (no_clear == 0) { 3723 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3724 } 3725 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3726 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3727 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3728 if (asoc->stream_reset_outstanding) 3729 asoc->stream_reset_outstanding--; 3730 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3731 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3732 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3733 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3734 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3735 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3736 } 3737 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3738 /* Ok we now may have more streams */ 3739 int num_stream; 3740 3741 num_stream = stcb->asoc.strm_pending_add_size; 3742 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3743 /* TSNH */ 3744 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3745 } 3746 stcb->asoc.strm_pending_add_size = 0; 3747 if (asoc->stream_reset_outstanding) 3748 asoc->stream_reset_outstanding--; 3749 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3750 /* Put the new streams into effect */ 3751 int i; 3752 3753 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3754 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3755 } 3756 asoc->streamoutcnt += num_stream; 3757 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3758 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3759 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3760 SCTP_STREAM_CHANGE_DENIED); 3761 } else { 3762 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3763 SCTP_STREAM_CHANGE_FAILED); 3764 } 3765 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3766 if (asoc->stream_reset_outstanding) 3767 asoc->stream_reset_outstanding--; 3768 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3769 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3770 SCTP_STREAM_CHANGE_DENIED); 3771 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3772 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3773 SCTP_STREAM_CHANGE_FAILED); 3774 } 3775 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3776 /** 3777 * a) Adopt the new in tsn. 3778 * b) reset the map 3779 * c) Adopt the new out-tsn 3780 */ 3781 struct sctp_stream_reset_response_tsn *resp; 3782 struct sctp_forward_tsn_chunk fwdtsn; 3783 int abort_flag = 0; 3784 3785 if (respin == NULL) { 3786 /* huh ? */ 3787 return (0); 3788 } 3789 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3790 return (0); 3791 } 3792 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3793 resp = (struct sctp_stream_reset_response_tsn *)respin; 3794 asoc->stream_reset_outstanding--; 3795 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3796 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3797 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3798 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3799 if (abort_flag) { 3800 return (1); 3801 } 3802 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3803 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3804 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3805 } 3806 3807 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3808 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3809 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3810 3811 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3812 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3813 3814 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3815 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3816 3817 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3818 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3819 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3820 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3821 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3822 SCTP_ASSOC_RESET_DENIED); 3823 } else { 3824 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3825 SCTP_ASSOC_RESET_FAILED); 3826 } 3827 } 3828 /* get rid of the request and get the request flags */ 3829 if (asoc->stream_reset_outstanding == 0) { 3830 sctp_clean_up_stream_reset(stcb); 3831 } 3832 } 3833 } 3834 if (asoc->stream_reset_outstanding == 0) { 3835 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3836 } 3837 return (0); 3838 } 3839 3840 static void 3841 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3842 struct sctp_tmit_chunk *chk, 3843 struct sctp_stream_reset_in_request *req, int trunc) 3844 { 3845 uint32_t seq; 3846 int len, i; 3847 int number_entries; 3848 uint16_t temp; 3849 3850 /* 3851 * peer wants me to send a str-reset to him for my outgoing seq's if 3852 * seq_in is right. 3853 */ 3854 struct sctp_association *asoc = &stcb->asoc; 3855 3856 seq = ntohl(req->request_seq); 3857 if (asoc->str_reset_seq_in == seq) { 3858 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3859 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3860 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3861 } else if (trunc) { 3862 /* Can't do it, since they exceeded our buffer size */ 3863 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3864 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3865 len = ntohs(req->ph.param_length); 3866 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3867 if (number_entries) { 3868 for (i = 0; i < number_entries; i++) { 3869 temp = ntohs(req->list_of_streams[i]); 3870 if (temp >= stcb->asoc.streamoutcnt) { 3871 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3872 goto bad_boy; 3873 } 3874 req->list_of_streams[i] = temp; 3875 } 3876 for (i = 0; i < number_entries; i++) { 3877 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3878 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3879 } 3880 } 3881 } else { 3882 /* Its all */ 3883 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3884 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3885 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3886 } 3887 } 3888 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3889 } else { 3890 /* Can't do it, since we have sent one out */ 3891 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3892 } 3893 bad_boy: 3894 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3895 asoc->str_reset_seq_in++; 3896 } else if (asoc->str_reset_seq_in - 1 == seq) { 3897 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3898 } else if (asoc->str_reset_seq_in - 2 == seq) { 3899 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3900 } else { 3901 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3902 } 3903 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3904 } 3905 3906 static int 3907 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3908 struct sctp_tmit_chunk *chk, 3909 struct sctp_stream_reset_tsn_request *req) 3910 { 3911 /* reset all in and out and update the tsn */ 3912 /* 3913 * A) reset my str-seq's on in and out. B) Select a receive next, 3914 * and set cum-ack to it. Also process this selected number as a 3915 * fwd-tsn as well. C) set in the response my next sending seq. 3916 */ 3917 struct sctp_forward_tsn_chunk fwdtsn; 3918 struct sctp_association *asoc = &stcb->asoc; 3919 int abort_flag = 0; 3920 uint32_t seq; 3921 3922 seq = ntohl(req->request_seq); 3923 if (asoc->str_reset_seq_in == seq) { 3924 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3925 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3926 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3927 } else { 3928 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3929 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3930 fwdtsn.ch.chunk_flags = 0; 3931 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3932 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3933 if (abort_flag) { 3934 return (1); 3935 } 3936 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3937 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3938 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3939 } 3940 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3941 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3942 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3943 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3944 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3945 atomic_add_int(&asoc->sending_seq, 1); 3946 /* save off historical data for retrans */ 3947 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3948 asoc->last_sending_seq[0] = asoc->sending_seq; 3949 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3950 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3951 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3952 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3953 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3954 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3955 } 3956 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3957 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3958 asoc->str_reset_seq_in++; 3959 } else if (asoc->str_reset_seq_in - 1 == seq) { 3960 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3961 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3962 } else if (asoc->str_reset_seq_in - 2 == seq) { 3963 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3964 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3965 } else { 3966 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3967 } 3968 return (0); 3969 } 3970 3971 static void 3972 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3973 struct sctp_tmit_chunk *chk, 3974 struct sctp_stream_reset_out_request *req, int trunc) 3975 { 3976 uint32_t seq, tsn; 3977 int number_entries, len; 3978 struct sctp_association *asoc = &stcb->asoc; 3979 3980 seq = ntohl(req->request_seq); 3981 3982 /* now if its not a duplicate we process it */ 3983 if (asoc->str_reset_seq_in == seq) { 3984 len = ntohs(req->ph.param_length); 3985 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3986 /* 3987 * the sender is resetting, handle the list issue.. we must 3988 * a) verify if we can do the reset, if so no problem b) If 3989 * we can't do the reset we must copy the request. c) queue 3990 * it, and setup the data in processor to trigger it off 3991 * when needed and dequeue all the queued data. 3992 */ 3993 tsn = ntohl(req->send_reset_at_tsn); 3994 3995 /* move the reset action back one */ 3996 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3997 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3998 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3999 } else if (trunc) { 4000 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4001 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 4002 /* we can do it now */ 4003 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 4004 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4005 } else { 4006 /* 4007 * we must queue it up and thus wait for the TSN's 4008 * to arrive that are at or before tsn 4009 */ 4010 struct sctp_stream_reset_list *liste; 4011 int siz; 4012 4013 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4014 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4015 siz, SCTP_M_STRESET); 4016 if (liste == NULL) { 4017 /* gak out of memory */ 4018 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4019 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4020 return; 4021 } 4022 liste->seq = seq; 4023 liste->tsn = tsn; 4024 liste->number_entries = number_entries; 4025 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4026 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4027 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4028 } 4029 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4030 asoc->str_reset_seq_in++; 4031 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4032 /* 4033 * one seq back, just echo back last action since my 4034 * response was lost. 4035 */ 4036 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4037 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4038 /* 4039 * two seq back, just echo back last action since my 4040 * response was lost. 4041 */ 4042 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4043 } else { 4044 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4045 } 4046 } 4047 4048 static void 4049 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4050 struct sctp_stream_reset_add_strm *str_add) 4051 { 4052 /* 4053 * Peer is requesting to add more streams. If its within our 4054 * max-streams we will allow it. 4055 */ 4056 uint32_t num_stream, i; 4057 uint32_t seq; 4058 struct sctp_association *asoc = &stcb->asoc; 4059 struct sctp_queued_to_read *ctl, *nctl; 4060 4061 /* Get the number. */ 4062 seq = ntohl(str_add->request_seq); 4063 num_stream = ntohs(str_add->number_of_streams); 4064 /* Now what would be the new total? */ 4065 if (asoc->str_reset_seq_in == seq) { 4066 num_stream += stcb->asoc.streamincnt; 4067 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4068 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4069 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4070 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4071 (num_stream > 0xffff)) { 4072 /* We must reject it they ask for to many */ 4073 denied: 4074 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4075 } else { 4076 /* Ok, we can do that :-) */ 4077 struct sctp_stream_in *oldstrm; 4078 4079 /* save off the old */ 4080 oldstrm = stcb->asoc.strmin; 4081 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4082 (num_stream * sizeof(struct sctp_stream_in)), 4083 SCTP_M_STRMI); 4084 if (stcb->asoc.strmin == NULL) { 4085 stcb->asoc.strmin = oldstrm; 4086 goto denied; 4087 } 4088 /* copy off the old data */ 4089 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4090 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4091 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4092 stcb->asoc.strmin[i].sid = i; 4093 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4094 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4095 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4096 /* now anything on those queues? */ 4097 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4098 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4099 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4100 } 4101 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4102 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4103 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4104 } 4105 } 4106 /* Init the new streams */ 4107 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4108 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4109 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4110 stcb->asoc.strmin[i].sid = i; 4111 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4112 stcb->asoc.strmin[i].pd_api_started = 0; 4113 stcb->asoc.strmin[i].delivery_started = 0; 4114 } 4115 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4116 /* update the size */ 4117 stcb->asoc.streamincnt = num_stream; 4118 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4119 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4120 } 4121 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4122 asoc->str_reset_seq_in++; 4123 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4124 /* 4125 * one seq back, just echo back last action since my 4126 * response was lost. 4127 */ 4128 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4129 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4130 /* 4131 * two seq back, just echo back last action since my 4132 * response was lost. 4133 */ 4134 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4135 } else { 4136 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4137 4138 } 4139 } 4140 4141 static void 4142 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4143 struct sctp_stream_reset_add_strm *str_add) 4144 { 4145 /* 4146 * Peer is requesting to add more streams. If its within our 4147 * max-streams we will allow it. 4148 */ 4149 uint16_t num_stream; 4150 uint32_t seq; 4151 struct sctp_association *asoc = &stcb->asoc; 4152 4153 /* Get the number. */ 4154 seq = ntohl(str_add->request_seq); 4155 num_stream = ntohs(str_add->number_of_streams); 4156 /* Now what would be the new total? */ 4157 if (asoc->str_reset_seq_in == seq) { 4158 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4159 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4160 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4161 } else if (stcb->asoc.stream_reset_outstanding) { 4162 /* We must reject it we have something pending */ 4163 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4164 } else { 4165 /* Ok, we can do that :-) */ 4166 int mychk; 4167 4168 mychk = stcb->asoc.streamoutcnt; 4169 mychk += num_stream; 4170 if (mychk < 0x10000) { 4171 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4172 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4173 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4174 } 4175 } else { 4176 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4177 } 4178 } 4179 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4180 asoc->str_reset_seq_in++; 4181 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4182 /* 4183 * one seq back, just echo back last action since my 4184 * response was lost. 4185 */ 4186 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4187 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4188 /* 4189 * two seq back, just echo back last action since my 4190 * response was lost. 4191 */ 4192 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4193 } else { 4194 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4195 } 4196 } 4197 4198 #ifdef __GNUC__ 4199 __attribute__((noinline)) 4200 #endif 4201 static int 4202 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4203 struct sctp_chunkhdr *ch_req) 4204 { 4205 uint16_t remaining_length, param_len, ptype; 4206 struct sctp_paramhdr pstore; 4207 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4208 uint32_t seq = 0; 4209 int num_req = 0; 4210 int trunc = 0; 4211 struct sctp_tmit_chunk *chk; 4212 struct sctp_chunkhdr *ch; 4213 struct sctp_paramhdr *ph; 4214 int ret_code = 0; 4215 int num_param = 0; 4216 4217 /* now it may be a reset or a reset-response */ 4218 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4219 4220 /* setup for adding the response */ 4221 sctp_alloc_a_chunk(stcb, chk); 4222 if (chk == NULL) { 4223 return (ret_code); 4224 } 4225 chk->copy_by_ref = 0; 4226 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4227 chk->rec.chunk_id.can_take_data = 0; 4228 chk->flags = 0; 4229 chk->asoc = &stcb->asoc; 4230 chk->no_fr_allowed = 0; 4231 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4232 chk->book_size_scale = 0; 4233 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4234 if (chk->data == NULL) { 4235 strres_nochunk: 4236 if (chk->data) { 4237 sctp_m_freem(chk->data); 4238 chk->data = NULL; 4239 } 4240 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4241 return (ret_code); 4242 } 4243 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4244 4245 /* setup chunk parameters */ 4246 chk->sent = SCTP_DATAGRAM_UNSENT; 4247 chk->snd_count = 0; 4248 chk->whoTo = NULL; 4249 4250 ch = mtod(chk->data, struct sctp_chunkhdr *); 4251 ch->chunk_type = SCTP_STREAM_RESET; 4252 ch->chunk_flags = 0; 4253 ch->chunk_length = htons(chk->send_size); 4254 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4255 offset += sizeof(struct sctp_chunkhdr); 4256 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4257 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4258 if (ph == NULL) { 4259 /* TSNH */ 4260 break; 4261 } 4262 param_len = ntohs(ph->param_length); 4263 if ((param_len > remaining_length) || 4264 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4265 /* bad parameter length */ 4266 break; 4267 } 4268 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4269 (uint8_t *)&cstore); 4270 if (ph == NULL) { 4271 /* TSNH */ 4272 break; 4273 } 4274 ptype = ntohs(ph->param_type); 4275 num_param++; 4276 if (param_len > sizeof(cstore)) { 4277 trunc = 1; 4278 } else { 4279 trunc = 0; 4280 } 4281 if (num_param > SCTP_MAX_RESET_PARAMS) { 4282 /* hit the max of parameters already sorry.. */ 4283 break; 4284 } 4285 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4286 struct sctp_stream_reset_out_request *req_out; 4287 4288 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4289 break; 4290 } 4291 req_out = (struct sctp_stream_reset_out_request *)ph; 4292 num_req++; 4293 if (stcb->asoc.stream_reset_outstanding) { 4294 seq = ntohl(req_out->response_seq); 4295 if (seq == stcb->asoc.str_reset_seq_out) { 4296 /* implicit ack */ 4297 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4298 } 4299 } 4300 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4301 } else if (ptype == SCTP_STR_RESET_ADD_OUT_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_strm(stcb, chk, str_add); 4310 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4311 struct sctp_stream_reset_add_strm *str_add; 4312 4313 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4314 break; 4315 } 4316 str_add = (struct sctp_stream_reset_add_strm *)ph; 4317 num_req++; 4318 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4319 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4320 struct sctp_stream_reset_in_request *req_in; 4321 4322 num_req++; 4323 req_in = (struct sctp_stream_reset_in_request *)ph; 4324 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4325 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4326 struct sctp_stream_reset_tsn_request *req_tsn; 4327 4328 num_req++; 4329 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4330 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4331 ret_code = 1; 4332 goto strres_nochunk; 4333 } 4334 /* no more */ 4335 break; 4336 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4337 struct sctp_stream_reset_response *resp; 4338 uint32_t result; 4339 4340 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4341 break; 4342 } 4343 resp = (struct sctp_stream_reset_response *)ph; 4344 seq = ntohl(resp->response_seq); 4345 result = ntohl(resp->result); 4346 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4347 ret_code = 1; 4348 goto strres_nochunk; 4349 } 4350 } else { 4351 break; 4352 } 4353 offset += SCTP_SIZE32(param_len); 4354 if (remaining_length >= SCTP_SIZE32(param_len)) { 4355 remaining_length -= SCTP_SIZE32(param_len); 4356 } else { 4357 remaining_length = 0; 4358 } 4359 } 4360 if (num_req == 0) { 4361 /* we have no response free the stuff */ 4362 goto strres_nochunk; 4363 } 4364 /* ok we have a chunk to link in */ 4365 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4366 chk, 4367 sctp_next); 4368 stcb->asoc.ctrl_queue_cnt++; 4369 return (ret_code); 4370 } 4371 4372 /* 4373 * Handle a router or endpoints report of a packet loss, there are two ways 4374 * to handle this, either we get the whole packet and must disect it 4375 * ourselves (possibly with truncation and or corruption) or it is a summary 4376 * from a middle box that did the disectting for us. 4377 */ 4378 static void 4379 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4380 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4381 { 4382 uint32_t bottle_bw, on_queue; 4383 uint16_t trunc_len; 4384 unsigned int chlen; 4385 unsigned int at; 4386 struct sctp_chunk_desc desc; 4387 struct sctp_chunkhdr *ch; 4388 4389 chlen = ntohs(cp->ch.chunk_length); 4390 chlen -= sizeof(struct sctp_pktdrop_chunk); 4391 /* XXX possible chlen underflow */ 4392 if (chlen == 0) { 4393 ch = NULL; 4394 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4395 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4396 } else { 4397 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4398 chlen -= sizeof(struct sctphdr); 4399 /* XXX possible chlen underflow */ 4400 memset(&desc, 0, sizeof(desc)); 4401 } 4402 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4403 if (trunc_len > limit) { 4404 trunc_len = limit; 4405 } 4406 4407 /* now the chunks themselves */ 4408 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4409 desc.chunk_type = ch->chunk_type; 4410 /* get amount we need to move */ 4411 at = ntohs(ch->chunk_length); 4412 if (at < sizeof(struct sctp_chunkhdr)) { 4413 /* corrupt chunk, maybe at the end? */ 4414 SCTP_STAT_INCR(sctps_pdrpcrupt); 4415 break; 4416 } 4417 if (trunc_len == 0) { 4418 /* we are supposed to have all of it */ 4419 if (at > chlen) { 4420 /* corrupt skip it */ 4421 SCTP_STAT_INCR(sctps_pdrpcrupt); 4422 break; 4423 } 4424 } else { 4425 /* is there enough of it left ? */ 4426 if (desc.chunk_type == SCTP_DATA) { 4427 if (chlen < (sizeof(struct sctp_data_chunk) + 4428 sizeof(desc.data_bytes))) { 4429 break; 4430 } 4431 } else { 4432 if (chlen < sizeof(struct sctp_chunkhdr)) { 4433 break; 4434 } 4435 } 4436 } 4437 if (desc.chunk_type == SCTP_DATA) { 4438 /* can we get out the tsn? */ 4439 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4440 SCTP_STAT_INCR(sctps_pdrpmbda); 4441 4442 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4443 /* yep */ 4444 struct sctp_data_chunk *dcp; 4445 uint8_t *ddp; 4446 unsigned int iii; 4447 4448 dcp = (struct sctp_data_chunk *)ch; 4449 ddp = (uint8_t *)(dcp + 1); 4450 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4451 desc.data_bytes[iii] = ddp[iii]; 4452 } 4453 desc.tsn_ifany = dcp->dp.tsn; 4454 } else { 4455 /* nope we are done. */ 4456 SCTP_STAT_INCR(sctps_pdrpnedat); 4457 break; 4458 } 4459 } else { 4460 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4461 SCTP_STAT_INCR(sctps_pdrpmbct); 4462 } 4463 4464 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4465 SCTP_STAT_INCR(sctps_pdrppdbrk); 4466 break; 4467 } 4468 if (SCTP_SIZE32(at) > chlen) { 4469 break; 4470 } 4471 chlen -= SCTP_SIZE32(at); 4472 if (chlen < sizeof(struct sctp_chunkhdr)) { 4473 /* done, none left */ 4474 break; 4475 } 4476 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4477 } 4478 /* Now update any rwnd --- possibly */ 4479 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4480 /* From a peer, we get a rwnd report */ 4481 uint32_t a_rwnd; 4482 4483 SCTP_STAT_INCR(sctps_pdrpfehos); 4484 4485 bottle_bw = ntohl(cp->bottle_bw); 4486 on_queue = ntohl(cp->current_onq); 4487 if (bottle_bw && on_queue) { 4488 /* a rwnd report is in here */ 4489 if (bottle_bw > on_queue) 4490 a_rwnd = bottle_bw - on_queue; 4491 else 4492 a_rwnd = 0; 4493 4494 if (a_rwnd == 0) 4495 stcb->asoc.peers_rwnd = 0; 4496 else { 4497 if (a_rwnd > stcb->asoc.total_flight) { 4498 stcb->asoc.peers_rwnd = 4499 a_rwnd - stcb->asoc.total_flight; 4500 } else { 4501 stcb->asoc.peers_rwnd = 0; 4502 } 4503 if (stcb->asoc.peers_rwnd < 4504 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4505 /* SWS sender side engages */ 4506 stcb->asoc.peers_rwnd = 0; 4507 } 4508 } 4509 } 4510 } else { 4511 SCTP_STAT_INCR(sctps_pdrpfmbox); 4512 } 4513 4514 /* now middle boxes in sat networks get a cwnd bump */ 4515 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4516 (stcb->asoc.sat_t3_loss_recovery == 0) && 4517 (stcb->asoc.sat_network)) { 4518 /* 4519 * This is debatable but for sat networks it makes sense 4520 * Note if a T3 timer has went off, we will prohibit any 4521 * changes to cwnd until we exit the t3 loss recovery. 4522 */ 4523 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4524 net, cp, &bottle_bw, &on_queue); 4525 } 4526 } 4527 4528 /* 4529 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4530 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4531 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4532 * length of the complete packet outputs: - length: modified to remaining 4533 * length after control processing - netp: modified to new sctp_nets after 4534 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4535 * bad packet,...) otherwise return the tcb for this packet 4536 */ 4537 #ifdef __GNUC__ 4538 __attribute__((noinline)) 4539 #endif 4540 static struct sctp_tcb * 4541 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4542 struct sockaddr *src, struct sockaddr *dst, 4543 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4544 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4545 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4546 uint32_t vrf_id, uint16_t port) 4547 { 4548 struct sctp_association *asoc; 4549 struct mbuf *op_err; 4550 char msg[SCTP_DIAG_INFO_LEN]; 4551 uint32_t vtag_in; 4552 int num_chunks = 0; /* number of control chunks processed */ 4553 uint32_t chk_length, contiguous; 4554 int ret; 4555 int abort_no_unlock = 0; 4556 int ecne_seen = 0; 4557 4558 /* 4559 * How big should this be, and should it be alloc'd? Lets try the 4560 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4561 * until we get into jumbo grams and such.. 4562 */ 4563 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4564 int got_auth = 0; 4565 uint32_t auth_offset = 0, auth_len = 0; 4566 int auth_skipped = 0; 4567 int asconf_cnt = 0; 4568 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4569 struct socket *so; 4570 #endif 4571 4572 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4573 iphlen, *offset, length, (void *)stcb); 4574 4575 if (stcb) { 4576 SCTP_TCB_LOCK_ASSERT(stcb); 4577 } 4578 /* validate chunk header length... */ 4579 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4580 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4581 ntohs(ch->chunk_length)); 4582 *offset = length; 4583 return (stcb); 4584 } 4585 /* 4586 * validate the verification tag 4587 */ 4588 vtag_in = ntohl(sh->v_tag); 4589 4590 if (ch->chunk_type == SCTP_INITIATION) { 4591 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4592 ntohs(ch->chunk_length), vtag_in); 4593 if (vtag_in != 0) { 4594 /* protocol error- silently discard... */ 4595 SCTP_STAT_INCR(sctps_badvtag); 4596 if (stcb != NULL) { 4597 SCTP_TCB_UNLOCK(stcb); 4598 } 4599 return (NULL); 4600 } 4601 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4602 /* 4603 * If there is no stcb, skip the AUTH chunk and process 4604 * later after a stcb is found (to validate the lookup was 4605 * valid. 4606 */ 4607 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4608 (stcb == NULL) && 4609 (inp->auth_supported == 1)) { 4610 /* save this chunk for later processing */ 4611 auth_skipped = 1; 4612 auth_offset = *offset; 4613 auth_len = ntohs(ch->chunk_length); 4614 4615 /* (temporarily) move past this chunk */ 4616 *offset += SCTP_SIZE32(auth_len); 4617 if (*offset >= length) { 4618 /* no more data left in the mbuf chain */ 4619 *offset = length; 4620 return (NULL); 4621 } 4622 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4623 sizeof(struct sctp_chunkhdr), chunk_buf); 4624 } 4625 if (ch == NULL) { 4626 /* Help */ 4627 *offset = length; 4628 return (stcb); 4629 } 4630 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4631 goto process_control_chunks; 4632 } 4633 /* 4634 * first check if it's an ASCONF with an unknown src addr we 4635 * need to look inside to find the association 4636 */ 4637 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4638 struct sctp_chunkhdr *asconf_ch = ch; 4639 uint32_t asconf_offset = 0, asconf_len = 0; 4640 4641 /* inp's refcount may be reduced */ 4642 SCTP_INP_INCR_REF(inp); 4643 4644 asconf_offset = *offset; 4645 do { 4646 asconf_len = ntohs(asconf_ch->chunk_length); 4647 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4648 break; 4649 stcb = sctp_findassociation_ep_asconf(m, 4650 *offset, 4651 dst, 4652 sh, &inp, netp, vrf_id); 4653 if (stcb != NULL) 4654 break; 4655 asconf_offset += SCTP_SIZE32(asconf_len); 4656 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4657 sizeof(struct sctp_chunkhdr), chunk_buf); 4658 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4659 if (stcb == NULL) { 4660 /* 4661 * reduce inp's refcount if not reduced in 4662 * sctp_findassociation_ep_asconf(). 4663 */ 4664 SCTP_INP_DECR_REF(inp); 4665 } 4666 4667 /* now go back and verify any auth chunk to be sure */ 4668 if (auth_skipped && (stcb != NULL)) { 4669 struct sctp_auth_chunk *auth; 4670 4671 auth = (struct sctp_auth_chunk *) 4672 sctp_m_getptr(m, auth_offset, 4673 auth_len, chunk_buf); 4674 got_auth = 1; 4675 auth_skipped = 0; 4676 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4677 auth_offset)) { 4678 /* auth HMAC failed so dump it */ 4679 *offset = length; 4680 return (stcb); 4681 } else { 4682 /* remaining chunks are HMAC checked */ 4683 stcb->asoc.authenticated = 1; 4684 } 4685 } 4686 } 4687 if (stcb == NULL) { 4688 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4689 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4690 msg); 4691 /* no association, so it's out of the blue... */ 4692 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4693 mflowtype, mflowid, inp->fibnum, 4694 vrf_id, port); 4695 *offset = length; 4696 return (NULL); 4697 } 4698 asoc = &stcb->asoc; 4699 /* ABORT and SHUTDOWN can use either v_tag... */ 4700 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4701 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4702 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4703 /* Take the T-bit always into account. */ 4704 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4705 (vtag_in == asoc->my_vtag)) || 4706 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4707 (asoc->peer_vtag != htonl(0)) && 4708 (vtag_in == asoc->peer_vtag))) { 4709 /* this is valid */ 4710 } else { 4711 /* drop this packet... */ 4712 SCTP_STAT_INCR(sctps_badvtag); 4713 if (stcb != NULL) { 4714 SCTP_TCB_UNLOCK(stcb); 4715 } 4716 return (NULL); 4717 } 4718 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4719 if (vtag_in != asoc->my_vtag) { 4720 /* 4721 * this could be a stale SHUTDOWN-ACK or the 4722 * peer never got the SHUTDOWN-COMPLETE and 4723 * is still hung; we have started a new asoc 4724 * but it won't complete until the shutdown 4725 * is completed 4726 */ 4727 if (stcb != NULL) { 4728 SCTP_TCB_UNLOCK(stcb); 4729 } 4730 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4731 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4732 msg); 4733 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4734 sh, inp, op_err, 4735 mflowtype, mflowid, fibnum, 4736 vrf_id, port); 4737 return (NULL); 4738 } 4739 } else { 4740 /* for all other chunks, vtag must match */ 4741 if (vtag_in != asoc->my_vtag) { 4742 /* invalid vtag... */ 4743 SCTPDBG(SCTP_DEBUG_INPUT3, 4744 "invalid vtag: %xh, expect %xh\n", 4745 vtag_in, asoc->my_vtag); 4746 SCTP_STAT_INCR(sctps_badvtag); 4747 if (stcb != NULL) { 4748 SCTP_TCB_UNLOCK(stcb); 4749 } 4750 *offset = length; 4751 return (NULL); 4752 } 4753 } 4754 } /* end if !SCTP_COOKIE_ECHO */ 4755 /* 4756 * process all control chunks... 4757 */ 4758 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4759 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4760 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4761 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4762 /* implied cookie-ack.. we must have lost the ack */ 4763 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4764 *netp); 4765 } 4766 4767 process_control_chunks: 4768 while (IS_SCTP_CONTROL(ch)) { 4769 /* validate chunk length */ 4770 chk_length = ntohs(ch->chunk_length); 4771 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4772 ch->chunk_type, chk_length); 4773 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4774 if (chk_length < sizeof(*ch) || 4775 (*offset + (int)chk_length) > length) { 4776 *offset = length; 4777 return (stcb); 4778 } 4779 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4780 /* 4781 * INIT and INIT-ACK only gets the init ack "header" portion 4782 * only because we don't have to process the peer's COOKIE. 4783 * All others get a complete chunk. 4784 */ 4785 switch (ch->chunk_type) { 4786 case SCTP_INITIATION: 4787 contiguous = sizeof(struct sctp_init_chunk); 4788 break; 4789 case SCTP_INITIATION_ACK: 4790 contiguous = sizeof(struct sctp_init_ack_chunk); 4791 break; 4792 default: 4793 contiguous = min(chk_length, sizeof(chunk_buf)); 4794 break; 4795 } 4796 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4797 contiguous, 4798 chunk_buf); 4799 if (ch == NULL) { 4800 *offset = length; 4801 if (stcb != NULL) { 4802 SCTP_TCB_UNLOCK(stcb); 4803 } 4804 return (NULL); 4805 } 4806 4807 num_chunks++; 4808 /* Save off the last place we got a control from */ 4809 if (stcb != NULL) { 4810 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4811 /* 4812 * allow last_control to be NULL if 4813 * ASCONF... ASCONF processing will find the 4814 * right net later 4815 */ 4816 if ((netp != NULL) && (*netp != NULL)) 4817 stcb->asoc.last_control_chunk_from = *netp; 4818 } 4819 } 4820 #ifdef SCTP_AUDITING_ENABLED 4821 sctp_audit_log(0xB0, ch->chunk_type); 4822 #endif 4823 4824 /* check to see if this chunk required auth, but isn't */ 4825 if ((stcb != NULL) && 4826 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4827 !stcb->asoc.authenticated) { 4828 /* "silently" ignore */ 4829 SCTP_STAT_INCR(sctps_recvauthmissing); 4830 goto next_chunk; 4831 } 4832 switch (ch->chunk_type) { 4833 case SCTP_INITIATION: 4834 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4835 /* The INIT chunk must be the only chunk. */ 4836 if ((num_chunks > 1) || 4837 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4838 /* RFC 4960 requires that no ABORT is sent */ 4839 *offset = length; 4840 if (stcb != NULL) { 4841 SCTP_TCB_UNLOCK(stcb); 4842 } 4843 return (NULL); 4844 } 4845 /* Honor our resource limit. */ 4846 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4847 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4848 sctp_abort_association(inp, stcb, m, iphlen, 4849 src, dst, sh, op_err, 4850 mflowtype, mflowid, 4851 vrf_id, port); 4852 *offset = length; 4853 return (NULL); 4854 } 4855 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4856 (struct sctp_init_chunk *)ch, inp, 4857 stcb, *netp, &abort_no_unlock, 4858 mflowtype, mflowid, 4859 vrf_id, port); 4860 *offset = length; 4861 if ((!abort_no_unlock) && (stcb != NULL)) { 4862 SCTP_TCB_UNLOCK(stcb); 4863 } 4864 return (NULL); 4865 break; 4866 case SCTP_PAD_CHUNK: 4867 break; 4868 case SCTP_INITIATION_ACK: 4869 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4870 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4871 /* We are not interested anymore */ 4872 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4873 ; 4874 } else { 4875 *offset = length; 4876 if (stcb != NULL) { 4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4878 so = SCTP_INP_SO(inp); 4879 atomic_add_int(&stcb->asoc.refcnt, 1); 4880 SCTP_TCB_UNLOCK(stcb); 4881 SCTP_SOCKET_LOCK(so, 1); 4882 SCTP_TCB_LOCK(stcb); 4883 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4884 #endif 4885 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4886 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4887 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4888 SCTP_SOCKET_UNLOCK(so, 1); 4889 #endif 4890 } 4891 return (NULL); 4892 } 4893 } 4894 /* The INIT-ACK chunk must be the only chunk. */ 4895 if ((num_chunks > 1) || 4896 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4897 *offset = length; 4898 return (stcb); 4899 } 4900 if ((netp != NULL) && (*netp != NULL)) { 4901 ret = sctp_handle_init_ack(m, iphlen, *offset, 4902 src, dst, sh, 4903 (struct sctp_init_ack_chunk *)ch, 4904 stcb, *netp, 4905 &abort_no_unlock, 4906 mflowtype, mflowid, 4907 vrf_id); 4908 } else { 4909 ret = -1; 4910 } 4911 *offset = length; 4912 if (abort_no_unlock) { 4913 return (NULL); 4914 } 4915 /* 4916 * Special case, I must call the output routine to 4917 * get the cookie echoed 4918 */ 4919 if ((stcb != NULL) && (ret == 0)) { 4920 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4921 } 4922 return (stcb); 4923 break; 4924 case SCTP_SELECTIVE_ACK: 4925 case SCTP_NR_SELECTIVE_ACK: 4926 { 4927 int abort_now = 0; 4928 uint32_t a_rwnd, cum_ack; 4929 uint16_t num_seg, num_nr_seg, num_dup; 4930 uint8_t flags; 4931 int offset_seg, offset_dup; 4932 4933 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4934 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4935 SCTP_STAT_INCR(sctps_recvsacks); 4936 if (stcb == NULL) { 4937 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4938 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4939 break; 4940 } 4941 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4942 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4943 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4944 break; 4945 } 4946 } else { 4947 if (stcb->asoc.nrsack_supported == 0) { 4948 goto unknown_chunk; 4949 } 4950 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4951 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4952 break; 4953 } 4954 } 4955 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4956 /*- 4957 * If we have sent a shutdown-ack, we will pay no 4958 * attention to a sack sent in to us since 4959 * we don't care anymore. 4960 */ 4961 break; 4962 } 4963 flags = ch->chunk_flags; 4964 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4965 struct sctp_sack_chunk *sack; 4966 4967 sack = (struct sctp_sack_chunk *)ch; 4968 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4969 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4970 num_nr_seg = 0; 4971 num_dup = ntohs(sack->sack.num_dup_tsns); 4972 a_rwnd = ntohl(sack->sack.a_rwnd); 4973 if (sizeof(struct sctp_sack_chunk) + 4974 num_seg * sizeof(struct sctp_gap_ack_block) + 4975 num_dup * sizeof(uint32_t) != chk_length) { 4976 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4977 break; 4978 } 4979 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4980 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4981 } else { 4982 struct sctp_nr_sack_chunk *nr_sack; 4983 4984 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4985 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4986 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4987 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4988 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4989 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4990 if (sizeof(struct sctp_nr_sack_chunk) + 4991 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4992 num_dup * sizeof(uint32_t) != chk_length) { 4993 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4994 break; 4995 } 4996 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4997 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4998 } 4999 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5000 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 5001 cum_ack, num_seg, a_rwnd); 5002 stcb->asoc.seen_a_sack_this_pkt = 1; 5003 if ((stcb->asoc.pr_sctp_cnt == 0) && 5004 (num_seg == 0) && (num_nr_seg == 0) && 5005 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5006 (stcb->asoc.saw_sack_with_frags == 0) && 5007 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5008 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5009 /* 5010 * We have a SIMPLE sack having no 5011 * prior segments and data on sent 5012 * queue to be acked. Use the faster 5013 * path sack processing. We also 5014 * allow window update sacks with no 5015 * missing segments to go this way 5016 * too. 5017 */ 5018 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5019 &abort_now, ecne_seen); 5020 } else { 5021 if ((netp != NULL) && (*netp != NULL)) { 5022 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5023 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5024 cum_ack, a_rwnd, ecne_seen); 5025 } 5026 } 5027 if (abort_now) { 5028 /* ABORT signal from sack processing */ 5029 *offset = length; 5030 return (NULL); 5031 } 5032 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5033 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5034 (stcb->asoc.stream_queue_cnt == 0)) { 5035 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5036 } 5037 break; 5038 } 5039 case SCTP_HEARTBEAT_REQUEST: 5040 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5041 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5042 SCTP_STAT_INCR(sctps_recvheartbeat); 5043 sctp_send_heartbeat_ack(stcb, m, *offset, 5044 chk_length, *netp); 5045 } 5046 break; 5047 case SCTP_HEARTBEAT_ACK: 5048 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5049 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5050 /* Its not ours */ 5051 *offset = length; 5052 return (stcb); 5053 } 5054 SCTP_STAT_INCR(sctps_recvheartbeatack); 5055 if ((netp != NULL) && (*netp != NULL)) { 5056 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5057 stcb, *netp); 5058 } 5059 break; 5060 case SCTP_ABORT_ASSOCIATION: 5061 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5062 (void *)stcb); 5063 *offset = length; 5064 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5065 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5066 return (NULL); 5067 } else { 5068 return (stcb); 5069 } 5070 } else { 5071 return (NULL); 5072 } 5073 break; 5074 case SCTP_SHUTDOWN: 5075 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5076 (void *)stcb); 5077 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5078 *offset = length; 5079 return (stcb); 5080 } 5081 if ((netp != NULL) && (*netp != NULL)) { 5082 int abort_flag = 0; 5083 5084 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5085 stcb, *netp, &abort_flag); 5086 if (abort_flag) { 5087 *offset = length; 5088 return (NULL); 5089 } 5090 } 5091 break; 5092 case SCTP_SHUTDOWN_ACK: 5093 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5094 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5095 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5096 } 5097 *offset = length; 5098 return (NULL); 5099 break; 5100 case SCTP_OPERATION_ERROR: 5101 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5102 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5103 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5104 *offset = length; 5105 return (NULL); 5106 } 5107 break; 5108 case SCTP_COOKIE_ECHO: 5109 SCTPDBG(SCTP_DEBUG_INPUT3, 5110 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5111 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5112 ; 5113 } else { 5114 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5115 /* We are not interested anymore */ 5116 abend: 5117 if (stcb != NULL) { 5118 SCTP_TCB_UNLOCK(stcb); 5119 } 5120 *offset = length; 5121 return (NULL); 5122 } 5123 } 5124 /*- 5125 * First are we accepting? We do this again here 5126 * since it is possible that a previous endpoint WAS 5127 * listening responded to a INIT-ACK and then 5128 * closed. We opened and bound.. and are now no 5129 * longer listening. 5130 * 5131 * XXXGL: notes on checking listen queue length. 5132 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5133 * SOLISTENING(), because a listening "UDP type" 5134 * socket isn't listening in terms of the socket 5135 * layer. It is a normal data flow socket, that 5136 * can fork off new connections. Thus, we should 5137 * look into sol_qlen only in case we are !UDP. 5138 * 2) Checking sol_qlen in general requires locking 5139 * the socket, and this code lacks that. 5140 */ 5141 if ((stcb == NULL) && 5142 (!SCTP_IS_LISTENING(inp) || 5143 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5144 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5145 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5146 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5147 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5148 sctp_abort_association(inp, stcb, m, iphlen, 5149 src, dst, sh, op_err, 5150 mflowtype, mflowid, 5151 vrf_id, port); 5152 } 5153 *offset = length; 5154 return (NULL); 5155 } else { 5156 struct mbuf *ret_buf; 5157 struct sctp_inpcb *linp; 5158 5159 if (stcb) { 5160 linp = NULL; 5161 } else { 5162 linp = inp; 5163 } 5164 5165 if (linp != NULL) { 5166 SCTP_ASOC_CREATE_LOCK(linp); 5167 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5168 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5169 SCTP_ASOC_CREATE_UNLOCK(linp); 5170 goto abend; 5171 } 5172 } 5173 5174 if (netp != NULL) { 5175 struct sctp_tcb *locked_stcb; 5176 5177 locked_stcb = stcb; 5178 ret_buf = 5179 sctp_handle_cookie_echo(m, iphlen, 5180 *offset, 5181 src, dst, 5182 sh, 5183 (struct sctp_cookie_echo_chunk *)ch, 5184 &inp, &stcb, netp, 5185 auth_skipped, 5186 auth_offset, 5187 auth_len, 5188 &locked_stcb, 5189 mflowtype, 5190 mflowid, 5191 vrf_id, 5192 port); 5193 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5194 SCTP_TCB_UNLOCK(locked_stcb); 5195 } 5196 if (stcb != NULL) { 5197 SCTP_TCB_LOCK_ASSERT(stcb); 5198 } 5199 } else { 5200 ret_buf = NULL; 5201 } 5202 if (linp != NULL) { 5203 SCTP_ASOC_CREATE_UNLOCK(linp); 5204 } 5205 if (ret_buf == NULL) { 5206 if (stcb != NULL) { 5207 SCTP_TCB_UNLOCK(stcb); 5208 } 5209 SCTPDBG(SCTP_DEBUG_INPUT3, 5210 "GAK, null buffer\n"); 5211 *offset = length; 5212 return (NULL); 5213 } 5214 /* if AUTH skipped, see if it verified... */ 5215 if (auth_skipped) { 5216 got_auth = 1; 5217 auth_skipped = 0; 5218 } 5219 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5220 /* 5221 * Restart the timer if we have 5222 * pending data 5223 */ 5224 struct sctp_tmit_chunk *chk; 5225 5226 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5227 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5228 } 5229 } 5230 break; 5231 case SCTP_COOKIE_ACK: 5232 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5233 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5234 return (stcb); 5235 } 5236 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5237 /* We are not interested anymore */ 5238 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5239 ; 5240 } else if (stcb) { 5241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5242 so = SCTP_INP_SO(inp); 5243 atomic_add_int(&stcb->asoc.refcnt, 1); 5244 SCTP_TCB_UNLOCK(stcb); 5245 SCTP_SOCKET_LOCK(so, 1); 5246 SCTP_TCB_LOCK(stcb); 5247 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5248 #endif 5249 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5250 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5252 SCTP_SOCKET_UNLOCK(so, 1); 5253 #endif 5254 *offset = length; 5255 return (NULL); 5256 } 5257 } 5258 if ((netp != NULL) && (*netp != NULL)) { 5259 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5260 } 5261 break; 5262 case SCTP_ECN_ECHO: 5263 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5264 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5265 /* Its not ours */ 5266 *offset = length; 5267 return (stcb); 5268 } 5269 if (stcb->asoc.ecn_supported == 0) { 5270 goto unknown_chunk; 5271 } 5272 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5273 ecne_seen = 1; 5274 break; 5275 case SCTP_ECN_CWR: 5276 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5277 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5278 *offset = length; 5279 return (stcb); 5280 } 5281 if (stcb->asoc.ecn_supported == 0) { 5282 goto unknown_chunk; 5283 } 5284 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5285 break; 5286 case SCTP_SHUTDOWN_COMPLETE: 5287 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5288 /* must be first and only chunk */ 5289 if ((num_chunks > 1) || 5290 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5291 *offset = length; 5292 return (stcb); 5293 } 5294 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5295 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5296 stcb, *netp); 5297 } 5298 *offset = length; 5299 return (NULL); 5300 break; 5301 case SCTP_ASCONF: 5302 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5303 if (stcb != NULL) { 5304 if (stcb->asoc.asconf_supported == 0) { 5305 goto unknown_chunk; 5306 } 5307 sctp_handle_asconf(m, *offset, src, 5308 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5309 asconf_cnt++; 5310 } 5311 break; 5312 case SCTP_ASCONF_ACK: 5313 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5314 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5315 /* Its not ours */ 5316 *offset = length; 5317 return (stcb); 5318 } 5319 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5320 if (stcb->asoc.asconf_supported == 0) { 5321 goto unknown_chunk; 5322 } 5323 /* He's alive so give him credit */ 5324 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5325 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5326 stcb->asoc.overall_error_count, 5327 0, 5328 SCTP_FROM_SCTP_INPUT, 5329 __LINE__); 5330 } 5331 stcb->asoc.overall_error_count = 0; 5332 sctp_handle_asconf_ack(m, *offset, 5333 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5334 if (abort_no_unlock) 5335 return (NULL); 5336 } 5337 break; 5338 case SCTP_FORWARD_CUM_TSN: 5339 case SCTP_IFORWARD_CUM_TSN: 5340 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5341 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5342 /* Its not ours */ 5343 *offset = length; 5344 return (stcb); 5345 } 5346 5347 if (stcb != NULL) { 5348 int abort_flag = 0; 5349 5350 if (stcb->asoc.prsctp_supported == 0) { 5351 goto unknown_chunk; 5352 } 5353 *fwd_tsn_seen = 1; 5354 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5355 /* We are not interested anymore */ 5356 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5357 so = SCTP_INP_SO(inp); 5358 atomic_add_int(&stcb->asoc.refcnt, 1); 5359 SCTP_TCB_UNLOCK(stcb); 5360 SCTP_SOCKET_LOCK(so, 1); 5361 SCTP_TCB_LOCK(stcb); 5362 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5363 #endif 5364 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5365 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5366 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5367 SCTP_SOCKET_UNLOCK(so, 1); 5368 #endif 5369 *offset = length; 5370 return (NULL); 5371 } 5372 /* 5373 * For sending a SACK this looks like DATA 5374 * chunks. 5375 */ 5376 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5377 sctp_handle_forward_tsn(stcb, 5378 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5379 if (abort_flag) { 5380 *offset = length; 5381 return (NULL); 5382 } 5383 } 5384 break; 5385 case SCTP_STREAM_RESET: 5386 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5387 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5388 /* Its not ours */ 5389 *offset = length; 5390 return (stcb); 5391 } 5392 if (stcb->asoc.reconfig_supported == 0) { 5393 goto unknown_chunk; 5394 } 5395 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5396 /* stop processing */ 5397 *offset = length; 5398 return (NULL); 5399 } 5400 break; 5401 case SCTP_PACKET_DROPPED: 5402 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5403 /* re-get it all please */ 5404 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5405 /* Its not ours */ 5406 *offset = length; 5407 return (stcb); 5408 } 5409 5410 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5411 if (stcb->asoc.pktdrop_supported == 0) { 5412 goto unknown_chunk; 5413 } 5414 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5415 stcb, *netp, 5416 min(chk_length, contiguous)); 5417 } 5418 break; 5419 case SCTP_AUTHENTICATION: 5420 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5421 if (stcb == NULL) { 5422 /* save the first AUTH for later processing */ 5423 if (auth_skipped == 0) { 5424 auth_offset = *offset; 5425 auth_len = chk_length; 5426 auth_skipped = 1; 5427 } 5428 /* skip this chunk (temporarily) */ 5429 goto next_chunk; 5430 } 5431 if (stcb->asoc.auth_supported == 0) { 5432 goto unknown_chunk; 5433 } 5434 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5435 (chk_length > (sizeof(struct sctp_auth_chunk) + 5436 SCTP_AUTH_DIGEST_LEN_MAX))) { 5437 /* Its not ours */ 5438 *offset = length; 5439 return (stcb); 5440 } 5441 if (got_auth == 1) { 5442 /* skip this chunk... it's already auth'd */ 5443 goto next_chunk; 5444 } 5445 got_auth = 1; 5446 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5447 m, *offset)) { 5448 /* auth HMAC failed so dump the packet */ 5449 *offset = length; 5450 return (stcb); 5451 } else { 5452 /* remaining chunks are HMAC checked */ 5453 stcb->asoc.authenticated = 1; 5454 } 5455 break; 5456 5457 default: 5458 unknown_chunk: 5459 /* it's an unknown chunk! */ 5460 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5461 struct sctp_gen_error_cause *cause; 5462 int len; 5463 5464 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5465 0, M_NOWAIT, 1, MT_DATA); 5466 if (op_err != NULL) { 5467 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5468 cause = mtod(op_err, struct sctp_gen_error_cause *); 5469 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5470 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5471 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5472 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5473 if (SCTP_BUF_NEXT(op_err) != NULL) { 5474 #ifdef SCTP_MBUF_LOGGING 5475 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5476 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5477 } 5478 #endif 5479 sctp_queue_op_err(stcb, op_err); 5480 } else { 5481 sctp_m_freem(op_err); 5482 } 5483 } 5484 } 5485 if ((ch->chunk_type & 0x80) == 0) { 5486 /* discard this packet */ 5487 *offset = length; 5488 return (stcb); 5489 } /* else skip this bad chunk and continue... */ 5490 break; 5491 } /* switch (ch->chunk_type) */ 5492 5493 5494 next_chunk: 5495 /* get the next chunk */ 5496 *offset += SCTP_SIZE32(chk_length); 5497 if (*offset >= length) { 5498 /* no more data left in the mbuf chain */ 5499 break; 5500 } 5501 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5502 sizeof(struct sctp_chunkhdr), chunk_buf); 5503 if (ch == NULL) { 5504 *offset = length; 5505 return (stcb); 5506 } 5507 } /* while */ 5508 5509 if ((asconf_cnt > 0) && (stcb != NULL)) { 5510 sctp_send_asconf_ack(stcb); 5511 } 5512 return (stcb); 5513 } 5514 5515 5516 /* 5517 * common input chunk processing (v4 and v6) 5518 */ 5519 void 5520 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5521 struct sockaddr *src, struct sockaddr *dst, 5522 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5523 uint8_t compute_crc, 5524 uint8_t ecn_bits, 5525 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5526 uint32_t vrf_id, uint16_t port) 5527 { 5528 uint32_t high_tsn; 5529 int fwd_tsn_seen = 0, data_processed = 0; 5530 struct mbuf *m = *mm, *op_err; 5531 char msg[SCTP_DIAG_INFO_LEN]; 5532 int un_sent; 5533 int cnt_ctrl_ready = 0; 5534 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5535 struct sctp_tcb *stcb = NULL; 5536 struct sctp_nets *net = NULL; 5537 5538 SCTP_STAT_INCR(sctps_recvdatagrams); 5539 #ifdef SCTP_AUDITING_ENABLED 5540 sctp_audit_log(0xE0, 1); 5541 sctp_auditing(0, inp, stcb, net); 5542 #endif 5543 if (compute_crc != 0) { 5544 uint32_t check, calc_check; 5545 5546 check = sh->checksum; 5547 sh->checksum = 0; 5548 calc_check = sctp_calculate_cksum(m, iphlen); 5549 sh->checksum = check; 5550 if (calc_check != check) { 5551 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5552 calc_check, check, (void *)m, length, iphlen); 5553 stcb = sctp_findassociation_addr(m, offset, src, dst, 5554 sh, ch, &inp, &net, vrf_id); 5555 #if defined(INET) || defined(INET6) 5556 if ((ch->chunk_type != SCTP_INITIATION) && 5557 (net != NULL) && (net->port != port)) { 5558 if (net->port == 0) { 5559 /* UDP encapsulation turned on. */ 5560 net->mtu -= sizeof(struct udphdr); 5561 if (stcb->asoc.smallest_mtu > net->mtu) { 5562 sctp_pathmtu_adjustment(stcb, net->mtu); 5563 } 5564 } else if (port == 0) { 5565 /* UDP encapsulation turned off. */ 5566 net->mtu += sizeof(struct udphdr); 5567 /* XXX Update smallest_mtu */ 5568 } 5569 net->port = port; 5570 } 5571 #endif 5572 if (net != NULL) { 5573 net->flowtype = mflowtype; 5574 net->flowid = mflowid; 5575 } 5576 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5577 if ((inp != NULL) && (stcb != NULL)) { 5578 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5579 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5580 } else if ((inp != NULL) && (stcb == NULL)) { 5581 inp_decr = inp; 5582 } 5583 SCTP_STAT_INCR(sctps_badsum); 5584 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5585 goto out; 5586 } 5587 } 5588 /* Destination port of 0 is illegal, based on RFC4960. */ 5589 if (sh->dest_port == 0) { 5590 SCTP_STAT_INCR(sctps_hdrops); 5591 goto out; 5592 } 5593 stcb = sctp_findassociation_addr(m, offset, src, dst, 5594 sh, ch, &inp, &net, vrf_id); 5595 #if defined(INET) || defined(INET6) 5596 if ((ch->chunk_type != SCTP_INITIATION) && 5597 (net != NULL) && (net->port != port)) { 5598 if (net->port == 0) { 5599 /* UDP encapsulation turned on. */ 5600 net->mtu -= sizeof(struct udphdr); 5601 if (stcb->asoc.smallest_mtu > net->mtu) { 5602 sctp_pathmtu_adjustment(stcb, net->mtu); 5603 } 5604 } else if (port == 0) { 5605 /* UDP encapsulation turned off. */ 5606 net->mtu += sizeof(struct udphdr); 5607 /* XXX Update smallest_mtu */ 5608 } 5609 net->port = port; 5610 } 5611 #endif 5612 if (net != NULL) { 5613 net->flowtype = mflowtype; 5614 net->flowid = mflowid; 5615 } 5616 if (inp == NULL) { 5617 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5618 SCTP_STAT_INCR(sctps_noport); 5619 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5620 goto out; 5621 } 5622 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5623 sctp_send_shutdown_complete2(src, dst, sh, 5624 mflowtype, mflowid, fibnum, 5625 vrf_id, port); 5626 goto out; 5627 } 5628 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5629 goto out; 5630 } 5631 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5632 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5633 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5634 (ch->chunk_type != SCTP_INIT))) { 5635 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5636 "Out of the blue"); 5637 sctp_send_abort(m, iphlen, src, dst, 5638 sh, 0, op_err, 5639 mflowtype, mflowid, fibnum, 5640 vrf_id, port); 5641 } 5642 } 5643 goto out; 5644 } else if (stcb == NULL) { 5645 inp_decr = inp; 5646 } 5647 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5648 (void *)m, iphlen, offset, length, (void *)stcb); 5649 if (stcb) { 5650 /* always clear this before beginning a packet */ 5651 stcb->asoc.authenticated = 0; 5652 stcb->asoc.seen_a_sack_this_pkt = 0; 5653 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5654 (void *)stcb, stcb->asoc.state); 5655 5656 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5657 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5658 /*- 5659 * If we hit here, we had a ref count 5660 * up when the assoc was aborted and the 5661 * timer is clearing out the assoc, we should 5662 * NOT respond to any packet.. its OOTB. 5663 */ 5664 SCTP_TCB_UNLOCK(stcb); 5665 stcb = NULL; 5666 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5667 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5668 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5669 msg); 5670 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5671 mflowtype, mflowid, inp->fibnum, 5672 vrf_id, port); 5673 goto out; 5674 } 5675 } 5676 if (IS_SCTP_CONTROL(ch)) { 5677 /* process the control portion of the SCTP packet */ 5678 /* sa_ignore NO_NULL_CHK */ 5679 stcb = sctp_process_control(m, iphlen, &offset, length, 5680 src, dst, sh, ch, 5681 inp, stcb, &net, &fwd_tsn_seen, 5682 mflowtype, mflowid, fibnum, 5683 vrf_id, port); 5684 if (stcb) { 5685 /* 5686 * This covers us if the cookie-echo was there and 5687 * it changes our INP. 5688 */ 5689 inp = stcb->sctp_ep; 5690 #if defined(INET) || defined(INET6) 5691 if ((ch->chunk_type != SCTP_INITIATION) && 5692 (net != NULL) && (net->port != port)) { 5693 if (net->port == 0) { 5694 /* UDP encapsulation turned on. */ 5695 net->mtu -= sizeof(struct udphdr); 5696 if (stcb->asoc.smallest_mtu > net->mtu) { 5697 sctp_pathmtu_adjustment(stcb, net->mtu); 5698 } 5699 } else if (port == 0) { 5700 /* UDP encapsulation turned off. */ 5701 net->mtu += sizeof(struct udphdr); 5702 /* XXX Update smallest_mtu */ 5703 } 5704 net->port = port; 5705 } 5706 #endif 5707 } 5708 } else { 5709 /* 5710 * no control chunks, so pre-process DATA chunks (these 5711 * checks are taken care of by control processing) 5712 */ 5713 5714 /* 5715 * if DATA only packet, and auth is required, then punt... 5716 * can't have authenticated without any AUTH (control) 5717 * chunks 5718 */ 5719 if ((stcb != NULL) && 5720 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5721 /* "silently" ignore */ 5722 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5723 SCTP_STAT_INCR(sctps_recvauthmissing); 5724 goto out; 5725 } 5726 if (stcb == NULL) { 5727 /* out of the blue DATA chunk */ 5728 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5729 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5730 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5731 msg); 5732 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5733 mflowtype, mflowid, fibnum, 5734 vrf_id, port); 5735 goto out; 5736 } 5737 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5738 /* v_tag mismatch! */ 5739 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5740 SCTP_STAT_INCR(sctps_badvtag); 5741 goto out; 5742 } 5743 } 5744 5745 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5746 if (stcb == NULL) { 5747 /* 5748 * no valid TCB for this packet, or we found it's a bad 5749 * packet while processing control, or we're done with this 5750 * packet (done or skip rest of data), so we drop it... 5751 */ 5752 goto out; 5753 } 5754 5755 /* 5756 * DATA chunk processing 5757 */ 5758 /* plow through the data chunks while length > offset */ 5759 5760 /* 5761 * Rest should be DATA only. Check authentication state if AUTH for 5762 * DATA is required. 5763 */ 5764 if ((length > offset) && 5765 (stcb != NULL) && 5766 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5767 !stcb->asoc.authenticated) { 5768 /* "silently" ignore */ 5769 SCTP_STAT_INCR(sctps_recvauthmissing); 5770 SCTPDBG(SCTP_DEBUG_AUTH1, 5771 "Data chunk requires AUTH, skipped\n"); 5772 goto trigger_send; 5773 } 5774 if (length > offset) { 5775 int retval; 5776 5777 /* 5778 * First check to make sure our state is correct. We would 5779 * not get here unless we really did have a tag, so we don't 5780 * abort if this happens, just dump the chunk silently. 5781 */ 5782 switch (SCTP_GET_STATE(stcb)) { 5783 case SCTP_STATE_COOKIE_ECHOED: 5784 /* 5785 * we consider data with valid tags in this state 5786 * shows us the cookie-ack was lost. Imply it was 5787 * there. 5788 */ 5789 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5790 break; 5791 case SCTP_STATE_COOKIE_WAIT: 5792 /* 5793 * We consider OOTB any data sent during asoc setup. 5794 */ 5795 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5796 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5797 msg); 5798 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5799 mflowtype, mflowid, inp->fibnum, 5800 vrf_id, port); 5801 goto out; 5802 /* sa_ignore NOTREACHED */ 5803 break; 5804 case SCTP_STATE_EMPTY: /* should not happen */ 5805 case SCTP_STATE_INUSE: /* should not happen */ 5806 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5807 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5808 default: 5809 goto out; 5810 /* sa_ignore NOTREACHED */ 5811 break; 5812 case SCTP_STATE_OPEN: 5813 case SCTP_STATE_SHUTDOWN_SENT: 5814 break; 5815 } 5816 /* plow through the data chunks while length > offset */ 5817 retval = sctp_process_data(mm, iphlen, &offset, length, 5818 inp, stcb, net, &high_tsn); 5819 if (retval == 2) { 5820 /* 5821 * The association aborted, NO UNLOCK needed since 5822 * the association is destroyed. 5823 */ 5824 stcb = NULL; 5825 goto out; 5826 } 5827 data_processed = 1; 5828 /* 5829 * Anything important needs to have been m_copy'ed in 5830 * process_data 5831 */ 5832 } 5833 5834 /* take care of ecn */ 5835 if ((data_processed == 1) && 5836 (stcb->asoc.ecn_supported == 1) && 5837 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5838 /* Yep, we need to add a ECNE */ 5839 sctp_send_ecn_echo(stcb, net, high_tsn); 5840 } 5841 5842 if ((data_processed == 0) && (fwd_tsn_seen)) { 5843 int was_a_gap; 5844 uint32_t highest_tsn; 5845 5846 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5847 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5848 } else { 5849 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5850 } 5851 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5852 stcb->asoc.send_sack = 1; 5853 sctp_sack_check(stcb, was_a_gap); 5854 } else if (fwd_tsn_seen) { 5855 stcb->asoc.send_sack = 1; 5856 } 5857 /* trigger send of any chunks in queue... */ 5858 trigger_send: 5859 #ifdef SCTP_AUDITING_ENABLED 5860 sctp_audit_log(0xE0, 2); 5861 sctp_auditing(1, inp, stcb, net); 5862 #endif 5863 SCTPDBG(SCTP_DEBUG_INPUT1, 5864 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5865 stcb->asoc.peers_rwnd, 5866 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5867 stcb->asoc.total_flight); 5868 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5869 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5870 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5871 } 5872 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5873 cnt_ctrl_ready || 5874 stcb->asoc.trigger_reset || 5875 ((un_sent) && 5876 (stcb->asoc.peers_rwnd > 0 || 5877 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5878 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5879 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5880 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5881 } 5882 #ifdef SCTP_AUDITING_ENABLED 5883 sctp_audit_log(0xE0, 3); 5884 sctp_auditing(2, inp, stcb, net); 5885 #endif 5886 out: 5887 if (stcb != NULL) { 5888 SCTP_TCB_UNLOCK(stcb); 5889 } 5890 if (inp_decr != NULL) { 5891 /* reduce ref-count */ 5892 SCTP_INP_WLOCK(inp_decr); 5893 SCTP_INP_DECR_REF(inp_decr); 5894 SCTP_INP_WUNLOCK(inp_decr); 5895 } 5896 return; 5897 } 5898 5899 #ifdef INET 5900 void 5901 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5902 { 5903 struct mbuf *m; 5904 int iphlen; 5905 uint32_t vrf_id = 0; 5906 uint8_t ecn_bits; 5907 struct sockaddr_in src, dst; 5908 struct ip *ip; 5909 struct sctphdr *sh; 5910 struct sctp_chunkhdr *ch; 5911 int length, offset; 5912 uint8_t compute_crc; 5913 uint32_t mflowid; 5914 uint8_t mflowtype; 5915 uint16_t fibnum; 5916 5917 iphlen = off; 5918 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5919 SCTP_RELEASE_PKT(i_pak); 5920 return; 5921 } 5922 m = SCTP_HEADER_TO_CHAIN(i_pak); 5923 #ifdef SCTP_MBUF_LOGGING 5924 /* Log in any input mbufs */ 5925 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5926 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5927 } 5928 #endif 5929 #ifdef SCTP_PACKET_LOGGING 5930 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5931 sctp_packet_log(m); 5932 } 5933 #endif 5934 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5935 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5936 m->m_pkthdr.len, 5937 if_name(m->m_pkthdr.rcvif), 5938 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5939 mflowid = m->m_pkthdr.flowid; 5940 mflowtype = M_HASHTYPE_GET(m); 5941 fibnum = M_GETFIB(m); 5942 SCTP_STAT_INCR(sctps_recvpackets); 5943 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5944 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5945 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5946 if (SCTP_BUF_LEN(m) < offset) { 5947 if ((m = m_pullup(m, offset)) == NULL) { 5948 SCTP_STAT_INCR(sctps_hdrops); 5949 return; 5950 } 5951 } 5952 ip = mtod(m, struct ip *); 5953 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5954 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5955 offset -= sizeof(struct sctp_chunkhdr); 5956 memset(&src, 0, sizeof(struct sockaddr_in)); 5957 src.sin_family = AF_INET; 5958 src.sin_len = sizeof(struct sockaddr_in); 5959 src.sin_port = sh->src_port; 5960 src.sin_addr = ip->ip_src; 5961 memset(&dst, 0, sizeof(struct sockaddr_in)); 5962 dst.sin_family = AF_INET; 5963 dst.sin_len = sizeof(struct sockaddr_in); 5964 dst.sin_port = sh->dest_port; 5965 dst.sin_addr = ip->ip_dst; 5966 length = ntohs(ip->ip_len); 5967 /* Validate mbuf chain length with IP payload length. */ 5968 if (SCTP_HEADER_LEN(m) != length) { 5969 SCTPDBG(SCTP_DEBUG_INPUT1, 5970 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5971 SCTP_STAT_INCR(sctps_hdrops); 5972 goto out; 5973 } 5974 /* SCTP does not allow broadcasts or multicasts */ 5975 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5976 goto out; 5977 } 5978 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5979 goto out; 5980 } 5981 ecn_bits = ip->ip_tos; 5982 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5983 SCTP_STAT_INCR(sctps_recvhwcrc); 5984 compute_crc = 0; 5985 } else { 5986 SCTP_STAT_INCR(sctps_recvswcrc); 5987 compute_crc = 1; 5988 } 5989 sctp_common_input_processing(&m, iphlen, offset, length, 5990 (struct sockaddr *)&src, 5991 (struct sockaddr *)&dst, 5992 sh, ch, 5993 compute_crc, 5994 ecn_bits, 5995 mflowtype, mflowid, fibnum, 5996 vrf_id, port); 5997 out: 5998 if (m) { 5999 sctp_m_freem(m); 6000 } 6001 return; 6002 } 6003 6004 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6005 extern int *sctp_cpuarry; 6006 #endif 6007 6008 int 6009 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6010 { 6011 struct mbuf *m; 6012 int off; 6013 6014 m = *mp; 6015 off = *offp; 6016 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6017 if (mp_ncpus > 1) { 6018 struct ip *ip; 6019 struct sctphdr *sh; 6020 int offset; 6021 int cpu_to_use; 6022 uint32_t flowid, tag; 6023 6024 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6025 flowid = m->m_pkthdr.flowid; 6026 } else { 6027 /* 6028 * No flow id built by lower layers fix it so we 6029 * create one. 6030 */ 6031 offset = off + sizeof(struct sctphdr); 6032 if (SCTP_BUF_LEN(m) < offset) { 6033 if ((m = m_pullup(m, offset)) == NULL) { 6034 SCTP_STAT_INCR(sctps_hdrops); 6035 return (IPPROTO_DONE); 6036 } 6037 } 6038 ip = mtod(m, struct ip *); 6039 sh = (struct sctphdr *)((caddr_t)ip + off); 6040 tag = htonl(sh->v_tag); 6041 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6042 m->m_pkthdr.flowid = flowid; 6043 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6044 } 6045 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6046 sctp_queue_to_mcore(m, off, cpu_to_use); 6047 return (IPPROTO_DONE); 6048 } 6049 #endif 6050 sctp_input_with_port(m, off, 0); 6051 return (IPPROTO_DONE); 6052 } 6053 #endif 6054