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 } 708 } 709 } 710 711 static int 712 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 713 { 714 /* 715 * Return 0 means we want you to proceed with the abort non-zero 716 * means no abort processing. 717 */ 718 uint32_t new_vtag; 719 struct sctpasochead *head; 720 721 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 722 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 723 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 724 atomic_add_int(&stcb->asoc.refcnt, 1); 725 SCTP_TCB_UNLOCK(stcb); 726 SCTP_INP_INFO_WLOCK(); 727 SCTP_TCB_LOCK(stcb); 728 atomic_subtract_int(&stcb->asoc.refcnt, 1); 729 } else { 730 return (0); 731 } 732 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 733 /* generate a new vtag and send init */ 734 LIST_REMOVE(stcb, sctp_asocs); 735 stcb->asoc.my_vtag = new_vtag; 736 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 737 /* 738 * put it in the bucket in the vtag hash of assoc's for the 739 * system 740 */ 741 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 742 SCTP_INP_INFO_WUNLOCK(); 743 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 744 return (1); 745 } else { 746 /* 747 * treat like a case where the cookie expired i.e.: - dump 748 * current cookie. - generate a new vtag. - resend init. 749 */ 750 /* generate a new vtag and send init */ 751 LIST_REMOVE(stcb, sctp_asocs); 752 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 753 sctp_stop_all_cookie_timers(stcb); 754 sctp_toss_old_cookies(stcb, &stcb->asoc); 755 stcb->asoc.my_vtag = new_vtag; 756 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 757 /* 758 * put it in the bucket in the vtag hash of assoc's for the 759 * system 760 */ 761 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 762 SCTP_INP_INFO_WUNLOCK(); 763 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 764 return (1); 765 } 766 return (0); 767 } 768 769 static int 770 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 771 struct sctp_nets *net) 772 { 773 /* 774 * return 0 means we want you to proceed with the abort non-zero 775 * means no abort processing 776 */ 777 if (stcb->asoc.auth_supported == 0) { 778 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 779 return (0); 780 } 781 sctp_asconf_send_nat_state_update(stcb, net); 782 return (1); 783 } 784 785 786 /* Returns 1 if the stcb was aborted, 0 otherwise */ 787 static int 788 sctp_handle_abort(struct sctp_abort_chunk *abort, 789 struct sctp_tcb *stcb, struct sctp_nets *net) 790 { 791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 792 struct socket *so; 793 #endif 794 uint16_t len; 795 uint16_t error; 796 797 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 798 if (stcb == NULL) 799 return (0); 800 801 len = ntohs(abort->ch.chunk_length); 802 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 803 /* 804 * Need to check the cause codes for our two magic nat 805 * aborts which don't kill the assoc necessarily. 806 */ 807 struct sctp_error_cause *cause; 808 809 cause = (struct sctp_error_cause *)(abort + 1); 810 error = ntohs(cause->code); 811 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 812 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 813 abort->ch.chunk_flags); 814 if (sctp_handle_nat_colliding_state(stcb)) { 815 return (0); 816 } 817 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 818 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 819 abort->ch.chunk_flags); 820 if (sctp_handle_nat_missing_state(stcb, net)) { 821 return (0); 822 } 823 } 824 } else { 825 error = 0; 826 } 827 /* stop any receive timers */ 828 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 829 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 830 /* notify user of the abort and clean up... */ 831 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 832 /* free the tcb */ 833 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 834 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 835 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 836 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 837 } 838 #ifdef SCTP_ASOCLOG_OF_TSNS 839 sctp_print_out_track_log(stcb); 840 #endif 841 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 842 so = SCTP_INP_SO(stcb->sctp_ep); 843 atomic_add_int(&stcb->asoc.refcnt, 1); 844 SCTP_TCB_UNLOCK(stcb); 845 SCTP_SOCKET_LOCK(so, 1); 846 SCTP_TCB_LOCK(stcb); 847 atomic_subtract_int(&stcb->asoc.refcnt, 1); 848 #endif 849 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); 850 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 851 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 853 SCTP_SOCKET_UNLOCK(so, 1); 854 #endif 855 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 856 return (1); 857 } 858 859 static void 860 sctp_start_net_timers(struct sctp_tcb *stcb) 861 { 862 uint32_t cnt_hb_sent; 863 struct sctp_nets *net; 864 865 cnt_hb_sent = 0; 866 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 867 /* 868 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 869 * If the dest in unconfirmed send a hb as well if under 870 * max_hb_burst have been sent. 871 */ 872 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 873 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 874 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 875 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 876 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 877 cnt_hb_sent++; 878 } 879 } 880 if (cnt_hb_sent) { 881 sctp_chunk_output(stcb->sctp_ep, stcb, 882 SCTP_OUTPUT_FROM_COOKIE_ACK, 883 SCTP_SO_NOT_LOCKED); 884 } 885 } 886 887 888 static void 889 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 890 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 891 { 892 struct sctp_association *asoc; 893 int some_on_streamwheel; 894 int old_state; 895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 896 struct socket *so; 897 #endif 898 899 SCTPDBG(SCTP_DEBUG_INPUT2, 900 "sctp_handle_shutdown: handling SHUTDOWN\n"); 901 if (stcb == NULL) 902 return; 903 asoc = &stcb->asoc; 904 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 905 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 906 return; 907 } 908 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 909 /* Shutdown NOT the expected size */ 910 return; 911 } 912 old_state = SCTP_GET_STATE(stcb); 913 sctp_update_acked(stcb, cp, abort_flag); 914 if (*abort_flag) { 915 return; 916 } 917 if (asoc->control_pdapi) { 918 /* 919 * With a normal shutdown we assume the end of last record. 920 */ 921 SCTP_INP_READ_LOCK(stcb->sctp_ep); 922 if (asoc->control_pdapi->on_strm_q) { 923 struct sctp_stream_in *strm; 924 925 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 926 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 927 /* Unordered */ 928 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 929 asoc->control_pdapi->on_strm_q = 0; 930 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 931 /* Ordered */ 932 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 933 asoc->control_pdapi->on_strm_q = 0; 934 #ifdef INVARIANTS 935 } else { 936 panic("Unknown state on ctrl:%p on_strm_q:%d", 937 asoc->control_pdapi, 938 asoc->control_pdapi->on_strm_q); 939 #endif 940 } 941 } 942 asoc->control_pdapi->end_added = 1; 943 asoc->control_pdapi->pdapi_aborted = 1; 944 asoc->control_pdapi = NULL; 945 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 946 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 947 so = SCTP_INP_SO(stcb->sctp_ep); 948 atomic_add_int(&stcb->asoc.refcnt, 1); 949 SCTP_TCB_UNLOCK(stcb); 950 SCTP_SOCKET_LOCK(so, 1); 951 SCTP_TCB_LOCK(stcb); 952 atomic_subtract_int(&stcb->asoc.refcnt, 1); 953 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 954 /* assoc was freed while we were unlocked */ 955 SCTP_SOCKET_UNLOCK(so, 1); 956 return; 957 } 958 #endif 959 if (stcb->sctp_socket) { 960 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 961 } 962 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 963 SCTP_SOCKET_UNLOCK(so, 1); 964 #endif 965 } 966 /* goto SHUTDOWN_RECEIVED state to block new requests */ 967 if (stcb->sctp_socket) { 968 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 969 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 970 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 971 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 972 /* 973 * notify upper layer that peer has initiated a 974 * shutdown 975 */ 976 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 977 978 /* reset time */ 979 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 980 } 981 } 982 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 983 /* 984 * stop the shutdown timer, since we WILL move to 985 * SHUTDOWN-ACK-SENT. 986 */ 987 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 988 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 989 } 990 /* Now is there unsent data on a stream somewhere? */ 991 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 992 993 if (!TAILQ_EMPTY(&asoc->send_queue) || 994 !TAILQ_EMPTY(&asoc->sent_queue) || 995 some_on_streamwheel) { 996 /* By returning we will push more data out */ 997 return; 998 } else { 999 /* no outstanding data to send, so move on... */ 1000 /* send SHUTDOWN-ACK */ 1001 /* move to SHUTDOWN-ACK-SENT state */ 1002 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 1003 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 1004 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 1005 } 1006 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 1007 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 1008 sctp_stop_timers_for_shutdown(stcb); 1009 sctp_send_shutdown_ack(stcb, net); 1010 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 1011 stcb->sctp_ep, stcb, net); 1012 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1013 sctp_send_shutdown_ack(stcb, net); 1014 } 1015 } 1016 } 1017 1018 static void 1019 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1020 struct sctp_tcb *stcb, 1021 struct sctp_nets *net) 1022 { 1023 struct sctp_association *asoc; 1024 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1025 struct socket *so; 1026 1027 so = SCTP_INP_SO(stcb->sctp_ep); 1028 #endif 1029 SCTPDBG(SCTP_DEBUG_INPUT2, 1030 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1031 if (stcb == NULL) 1032 return; 1033 1034 asoc = &stcb->asoc; 1035 /* process according to association state */ 1036 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1037 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1038 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1039 sctp_send_shutdown_complete(stcb, net, 1); 1040 SCTP_TCB_UNLOCK(stcb); 1041 return; 1042 } 1043 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 1044 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1045 /* unexpected SHUTDOWN-ACK... so ignore... */ 1046 SCTP_TCB_UNLOCK(stcb); 1047 return; 1048 } 1049 if (asoc->control_pdapi) { 1050 /* 1051 * With a normal shutdown we assume the end of last record. 1052 */ 1053 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1054 asoc->control_pdapi->end_added = 1; 1055 asoc->control_pdapi->pdapi_aborted = 1; 1056 asoc->control_pdapi = NULL; 1057 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1058 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1059 atomic_add_int(&stcb->asoc.refcnt, 1); 1060 SCTP_TCB_UNLOCK(stcb); 1061 SCTP_SOCKET_LOCK(so, 1); 1062 SCTP_TCB_LOCK(stcb); 1063 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1064 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1065 /* assoc was freed while we were unlocked */ 1066 SCTP_SOCKET_UNLOCK(so, 1); 1067 return; 1068 } 1069 #endif 1070 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1071 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1072 SCTP_SOCKET_UNLOCK(so, 1); 1073 #endif 1074 } 1075 #ifdef INVARIANTS 1076 if (!TAILQ_EMPTY(&asoc->send_queue) || 1077 !TAILQ_EMPTY(&asoc->sent_queue) || 1078 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1079 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1080 } 1081 #endif 1082 /* stop the timer */ 1083 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1084 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1085 /* send SHUTDOWN-COMPLETE */ 1086 sctp_send_shutdown_complete(stcb, net, 0); 1087 /* notify upper layer protocol */ 1088 if (stcb->sctp_socket) { 1089 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1090 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1091 stcb->sctp_socket->so_snd.sb_cc = 0; 1092 } 1093 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1094 } 1095 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1096 /* free the TCB but first save off the ep */ 1097 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1098 atomic_add_int(&stcb->asoc.refcnt, 1); 1099 SCTP_TCB_UNLOCK(stcb); 1100 SCTP_SOCKET_LOCK(so, 1); 1101 SCTP_TCB_LOCK(stcb); 1102 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1103 #endif 1104 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1105 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1106 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1107 SCTP_SOCKET_UNLOCK(so, 1); 1108 #endif 1109 } 1110 1111 static void 1112 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1113 { 1114 switch (chunk_type) { 1115 case SCTP_ASCONF_ACK: 1116 case SCTP_ASCONF: 1117 sctp_asconf_cleanup(stcb); 1118 break; 1119 case SCTP_IFORWARD_CUM_TSN: 1120 case SCTP_FORWARD_CUM_TSN: 1121 stcb->asoc.prsctp_supported = 0; 1122 break; 1123 default: 1124 SCTPDBG(SCTP_DEBUG_INPUT2, 1125 "Peer does not support chunk type %d (0x%x).\n", 1126 chunk_type, chunk_type); 1127 break; 1128 } 1129 } 1130 1131 /* 1132 * Skip past the param header and then we will find the param that caused the 1133 * problem. There are a number of param's in a ASCONF OR the prsctp param 1134 * these will turn of specific features. 1135 * XXX: Is this the right thing to do? 1136 */ 1137 static void 1138 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1139 { 1140 switch (parameter_type) { 1141 /* pr-sctp draft */ 1142 case SCTP_PRSCTP_SUPPORTED: 1143 stcb->asoc.prsctp_supported = 0; 1144 break; 1145 case SCTP_SUPPORTED_CHUNK_EXT: 1146 break; 1147 /* draft-ietf-tsvwg-addip-sctp */ 1148 case SCTP_HAS_NAT_SUPPORT: 1149 stcb->asoc.peer_supports_nat = 0; 1150 break; 1151 case SCTP_ADD_IP_ADDRESS: 1152 case SCTP_DEL_IP_ADDRESS: 1153 case SCTP_SET_PRIM_ADDR: 1154 stcb->asoc.asconf_supported = 0; 1155 break; 1156 case SCTP_SUCCESS_REPORT: 1157 case SCTP_ERROR_CAUSE_IND: 1158 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1159 SCTPDBG(SCTP_DEBUG_INPUT2, 1160 "Turning off ASCONF to this strange peer\n"); 1161 stcb->asoc.asconf_supported = 0; 1162 break; 1163 default: 1164 SCTPDBG(SCTP_DEBUG_INPUT2, 1165 "Peer does not support param type %d (0x%x)??\n", 1166 parameter_type, parameter_type); 1167 break; 1168 } 1169 } 1170 1171 static int 1172 sctp_handle_error(struct sctp_chunkhdr *ch, 1173 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1174 { 1175 struct sctp_error_cause *cause; 1176 struct sctp_association *asoc; 1177 uint32_t remaining_length, adjust; 1178 uint16_t code, cause_code, cause_length; 1179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1180 struct socket *so; 1181 #endif 1182 1183 /* parse through all of the errors and process */ 1184 asoc = &stcb->asoc; 1185 cause = (struct sctp_error_cause *)((caddr_t)ch + 1186 sizeof(struct sctp_chunkhdr)); 1187 remaining_length = ntohs(ch->chunk_length); 1188 if (remaining_length > limit) { 1189 remaining_length = limit; 1190 } 1191 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1192 remaining_length -= sizeof(struct sctp_chunkhdr); 1193 } else { 1194 remaining_length = 0; 1195 } 1196 code = 0; 1197 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1198 /* Process an Error Cause */ 1199 cause_code = ntohs(cause->code); 1200 cause_length = ntohs(cause->length); 1201 if ((cause_length > remaining_length) || (cause_length == 0)) { 1202 /* Invalid cause length, possibly due to truncation. */ 1203 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1204 remaining_length, cause_length); 1205 return (0); 1206 } 1207 if (code == 0) { 1208 /* report the first error cause */ 1209 code = cause_code; 1210 } 1211 switch (cause_code) { 1212 case SCTP_CAUSE_INVALID_STREAM: 1213 case SCTP_CAUSE_MISSING_PARAM: 1214 case SCTP_CAUSE_INVALID_PARAM: 1215 case SCTP_CAUSE_NO_USER_DATA: 1216 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1217 cause_code); 1218 break; 1219 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1220 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1221 ch->chunk_flags); 1222 if (sctp_handle_nat_colliding_state(stcb)) { 1223 return (0); 1224 } 1225 break; 1226 case SCTP_CAUSE_NAT_MISSING_STATE: 1227 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1228 ch->chunk_flags); 1229 if (sctp_handle_nat_missing_state(stcb, net)) { 1230 return (0); 1231 } 1232 break; 1233 case SCTP_CAUSE_STALE_COOKIE: 1234 /* 1235 * We only act if we have echoed a cookie and are 1236 * waiting. 1237 */ 1238 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1239 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1240 struct sctp_error_stale_cookie *stale_cookie; 1241 1242 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1243 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1244 /* Double it to be more robust on RTX */ 1245 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1246 asoc->cookie_preserve_req *= 2; 1247 } else { 1248 asoc->cookie_preserve_req = UINT32_MAX; 1249 } 1250 asoc->stale_cookie_count++; 1251 if (asoc->stale_cookie_count > 1252 asoc->max_init_times) { 1253 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1254 /* now free the asoc */ 1255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1256 so = SCTP_INP_SO(stcb->sctp_ep); 1257 atomic_add_int(&stcb->asoc.refcnt, 1); 1258 SCTP_TCB_UNLOCK(stcb); 1259 SCTP_SOCKET_LOCK(so, 1); 1260 SCTP_TCB_LOCK(stcb); 1261 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1262 #endif 1263 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1264 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1265 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1266 SCTP_SOCKET_UNLOCK(so, 1); 1267 #endif 1268 return (-1); 1269 } 1270 /* blast back to INIT state */ 1271 sctp_toss_old_cookies(stcb, &stcb->asoc); 1272 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1273 sctp_stop_all_cookie_timers(stcb); 1274 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1275 } 1276 break; 1277 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1278 /* 1279 * Nothing we can do here, we don't do hostname 1280 * addresses so if the peer does not like my IPv6 1281 * (or IPv4 for that matter) it does not matter. If 1282 * they don't support that type of address, they can 1283 * NOT possibly get that packet type... i.e. with no 1284 * IPv6 you can't receive a IPv6 packet. so we can 1285 * safely ignore this one. If we ever added support 1286 * for HOSTNAME Addresses, then we would need to do 1287 * something here. 1288 */ 1289 break; 1290 case SCTP_CAUSE_UNRECOG_CHUNK: 1291 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1292 struct sctp_error_unrecognized_chunk *unrec_chunk; 1293 1294 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1295 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1296 } 1297 break; 1298 case SCTP_CAUSE_UNRECOG_PARAM: 1299 /* XXX: We only consider the first parameter */ 1300 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1301 struct sctp_paramhdr *unrec_parameter; 1302 1303 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1304 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1305 } 1306 break; 1307 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1308 /* 1309 * We ignore this since the timer will drive out a 1310 * new cookie anyway and there timer will drive us 1311 * to send a SHUTDOWN_COMPLETE. We can't send one 1312 * here since we don't have their tag. 1313 */ 1314 break; 1315 case SCTP_CAUSE_DELETING_LAST_ADDR: 1316 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1317 case SCTP_CAUSE_DELETING_SRC_ADDR: 1318 /* 1319 * We should NOT get these here, but in a 1320 * ASCONF-ACK. 1321 */ 1322 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1323 cause_code); 1324 break; 1325 case SCTP_CAUSE_OUT_OF_RESC: 1326 /* 1327 * And what, pray tell do we do with the fact that 1328 * the peer is out of resources? Not really sure we 1329 * could do anything but abort. I suspect this 1330 * should have came WITH an abort instead of in a 1331 * OP-ERROR. 1332 */ 1333 break; 1334 default: 1335 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1336 cause_code); 1337 break; 1338 } 1339 adjust = SCTP_SIZE32(cause_length); 1340 if (remaining_length >= adjust) { 1341 remaining_length -= adjust; 1342 } else { 1343 remaining_length = 0; 1344 } 1345 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1346 } 1347 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1348 return (0); 1349 } 1350 1351 static int 1352 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1353 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1354 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1355 struct sctp_nets *net, int *abort_no_unlock, 1356 uint8_t mflowtype, uint32_t mflowid, 1357 uint32_t vrf_id) 1358 { 1359 struct sctp_init_ack *init_ack; 1360 struct mbuf *op_err; 1361 1362 SCTPDBG(SCTP_DEBUG_INPUT2, 1363 "sctp_handle_init_ack: handling INIT-ACK\n"); 1364 1365 if (stcb == NULL) { 1366 SCTPDBG(SCTP_DEBUG_INPUT2, 1367 "sctp_handle_init_ack: TCB is null\n"); 1368 return (-1); 1369 } 1370 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1371 /* Invalid length */ 1372 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1373 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1374 src, dst, sh, op_err, 1375 mflowtype, mflowid, 1376 vrf_id, net->port); 1377 *abort_no_unlock = 1; 1378 return (-1); 1379 } 1380 init_ack = &cp->init; 1381 /* validate parameters */ 1382 if (init_ack->initiate_tag == 0) { 1383 /* protocol error... send an abort */ 1384 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1385 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1386 src, dst, sh, op_err, 1387 mflowtype, mflowid, 1388 vrf_id, net->port); 1389 *abort_no_unlock = 1; 1390 return (-1); 1391 } 1392 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1393 /* protocol error... send an abort */ 1394 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1395 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1396 src, dst, sh, op_err, 1397 mflowtype, mflowid, 1398 vrf_id, net->port); 1399 *abort_no_unlock = 1; 1400 return (-1); 1401 } 1402 if (init_ack->num_inbound_streams == 0) { 1403 /* protocol error... send an abort */ 1404 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1405 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1406 src, dst, sh, op_err, 1407 mflowtype, mflowid, 1408 vrf_id, net->port); 1409 *abort_no_unlock = 1; 1410 return (-1); 1411 } 1412 if (init_ack->num_outbound_streams == 0) { 1413 /* protocol error... send an abort */ 1414 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1415 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1416 src, dst, sh, op_err, 1417 mflowtype, mflowid, 1418 vrf_id, net->port); 1419 *abort_no_unlock = 1; 1420 return (-1); 1421 } 1422 /* process according to association state... */ 1423 switch (SCTP_GET_STATE(stcb)) { 1424 case SCTP_STATE_COOKIE_WAIT: 1425 /* this is the expected state for this chunk */ 1426 /* process the INIT-ACK parameters */ 1427 if (stcb->asoc.primary_destination->dest_state & 1428 SCTP_ADDR_UNCONFIRMED) { 1429 /* 1430 * The primary is where we sent the INIT, we can 1431 * always consider it confirmed when the INIT-ACK is 1432 * returned. Do this before we load addresses 1433 * though. 1434 */ 1435 stcb->asoc.primary_destination->dest_state &= 1436 ~SCTP_ADDR_UNCONFIRMED; 1437 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1438 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1439 } 1440 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1441 net, abort_no_unlock, 1442 mflowtype, mflowid, 1443 vrf_id) < 0) { 1444 /* error in parsing parameters */ 1445 return (-1); 1446 } 1447 /* update our state */ 1448 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1449 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1450 1451 /* reset the RTO calc */ 1452 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1453 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1454 stcb->asoc.overall_error_count, 1455 0, 1456 SCTP_FROM_SCTP_INPUT, 1457 __LINE__); 1458 } 1459 stcb->asoc.overall_error_count = 0; 1460 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1461 /* 1462 * collapse the init timer back in case of a exponential 1463 * backoff 1464 */ 1465 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1466 stcb, net); 1467 /* 1468 * the send at the end of the inbound data processing will 1469 * cause the cookie to be sent 1470 */ 1471 break; 1472 case SCTP_STATE_SHUTDOWN_SENT: 1473 /* incorrect state... discard */ 1474 break; 1475 case SCTP_STATE_COOKIE_ECHOED: 1476 /* incorrect state... discard */ 1477 break; 1478 case SCTP_STATE_OPEN: 1479 /* incorrect state... discard */ 1480 break; 1481 case SCTP_STATE_EMPTY: 1482 case SCTP_STATE_INUSE: 1483 default: 1484 /* incorrect state... discard */ 1485 return (-1); 1486 break; 1487 } 1488 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1489 return (0); 1490 } 1491 1492 static struct sctp_tcb * 1493 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1494 struct sockaddr *src, struct sockaddr *dst, 1495 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1496 struct sctp_inpcb *inp, struct sctp_nets **netp, 1497 struct sockaddr *init_src, int *notification, 1498 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1499 uint8_t mflowtype, uint32_t mflowid, 1500 uint32_t vrf_id, uint16_t port); 1501 1502 1503 /* 1504 * handle a state cookie for an existing association m: input packet mbuf 1505 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1506 * "split" mbuf and the cookie signature does not exist offset: offset into 1507 * mbuf to the cookie-echo chunk 1508 */ 1509 static struct sctp_tcb * 1510 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1511 struct sockaddr *src, struct sockaddr *dst, 1512 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1513 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1514 struct sockaddr *init_src, int *notification, 1515 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1516 uint8_t mflowtype, uint32_t mflowid, 1517 uint32_t vrf_id, uint16_t port) 1518 { 1519 struct sctp_association *asoc; 1520 struct sctp_init_chunk *init_cp, init_buf; 1521 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1522 struct sctp_nets *net; 1523 struct mbuf *op_err; 1524 struct timeval old; 1525 int init_offset, initack_offset, i; 1526 int retval; 1527 int spec_flag = 0; 1528 uint32_t how_indx; 1529 #if defined(SCTP_DETAILED_STR_STATS) 1530 int j; 1531 #endif 1532 1533 net = *netp; 1534 /* I know that the TCB is non-NULL from the caller */ 1535 asoc = &stcb->asoc; 1536 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1537 if (asoc->cookie_how[how_indx] == 0) 1538 break; 1539 } 1540 if (how_indx < sizeof(asoc->cookie_how)) { 1541 asoc->cookie_how[how_indx] = 1; 1542 } 1543 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1544 /* SHUTDOWN came in after sending INIT-ACK */ 1545 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1546 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1547 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1548 mflowtype, mflowid, inp->fibnum, 1549 vrf_id, net->port); 1550 if (how_indx < sizeof(asoc->cookie_how)) 1551 asoc->cookie_how[how_indx] = 2; 1552 return (NULL); 1553 } 1554 /* 1555 * find and validate the INIT chunk in the cookie (peer's info) the 1556 * INIT should start after the cookie-echo header struct (chunk 1557 * header, state cookie header struct) 1558 */ 1559 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1560 1561 init_cp = (struct sctp_init_chunk *) 1562 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1563 (uint8_t *)&init_buf); 1564 if (init_cp == NULL) { 1565 /* could not pull a INIT chunk in cookie */ 1566 return (NULL); 1567 } 1568 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1569 return (NULL); 1570 } 1571 /* 1572 * find and validate the INIT-ACK chunk in the cookie (my info) the 1573 * INIT-ACK follows the INIT chunk 1574 */ 1575 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1576 initack_cp = (struct sctp_init_ack_chunk *) 1577 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1578 (uint8_t *)&initack_buf); 1579 if (initack_cp == NULL) { 1580 /* could not pull INIT-ACK chunk in cookie */ 1581 return (NULL); 1582 } 1583 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1584 return (NULL); 1585 } 1586 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1587 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1588 /* 1589 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1590 * to get into the OPEN state 1591 */ 1592 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1593 /*- 1594 * Opps, this means that we somehow generated two vtag's 1595 * the same. I.e. we did: 1596 * Us Peer 1597 * <---INIT(tag=a)------ 1598 * ----INIT-ACK(tag=t)--> 1599 * ----INIT(tag=t)------> *1 1600 * <---INIT-ACK(tag=a)--- 1601 * <----CE(tag=t)------------- *2 1602 * 1603 * At point *1 we should be generating a different 1604 * tag t'. Which means we would throw away the CE and send 1605 * ours instead. Basically this is case C (throw away side). 1606 */ 1607 if (how_indx < sizeof(asoc->cookie_how)) 1608 asoc->cookie_how[how_indx] = 17; 1609 return (NULL); 1610 1611 } 1612 switch (SCTP_GET_STATE(stcb)) { 1613 case SCTP_STATE_COOKIE_WAIT: 1614 case SCTP_STATE_COOKIE_ECHOED: 1615 /* 1616 * INIT was sent but got a COOKIE_ECHO with the 1617 * correct tags... just accept it...but we must 1618 * process the init so that we can make sure we have 1619 * the right seq no's. 1620 */ 1621 /* First we must process the INIT !! */ 1622 retval = sctp_process_init(init_cp, stcb); 1623 if (retval < 0) { 1624 if (how_indx < sizeof(asoc->cookie_how)) 1625 asoc->cookie_how[how_indx] = 3; 1626 return (NULL); 1627 } 1628 /* we have already processed the INIT so no problem */ 1629 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1630 stcb, net, 1631 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1632 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1633 stcb, net, 1634 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1635 /* update current state */ 1636 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1637 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1638 else 1639 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1640 1641 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1642 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1643 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1644 stcb->sctp_ep, stcb, NULL); 1645 } 1646 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1647 sctp_stop_all_cookie_timers(stcb); 1648 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1649 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1650 (!SCTP_IS_LISTENING(inp))) { 1651 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1652 struct socket *so; 1653 #endif 1654 /* 1655 * Here is where collision would go if we 1656 * did a connect() and instead got a 1657 * init/init-ack/cookie done before the 1658 * init-ack came back.. 1659 */ 1660 stcb->sctp_ep->sctp_flags |= 1661 SCTP_PCB_FLAGS_CONNECTED; 1662 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1663 so = SCTP_INP_SO(stcb->sctp_ep); 1664 atomic_add_int(&stcb->asoc.refcnt, 1); 1665 SCTP_TCB_UNLOCK(stcb); 1666 SCTP_SOCKET_LOCK(so, 1); 1667 SCTP_TCB_LOCK(stcb); 1668 atomic_add_int(&stcb->asoc.refcnt, -1); 1669 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1670 SCTP_SOCKET_UNLOCK(so, 1); 1671 return (NULL); 1672 } 1673 #endif 1674 soisconnected(stcb->sctp_socket); 1675 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1676 SCTP_SOCKET_UNLOCK(so, 1); 1677 #endif 1678 } 1679 /* notify upper layer */ 1680 *notification = SCTP_NOTIFY_ASSOC_UP; 1681 /* 1682 * since we did not send a HB make sure we don't 1683 * double things 1684 */ 1685 old.tv_sec = cookie->time_entered.tv_sec; 1686 old.tv_usec = cookie->time_entered.tv_usec; 1687 net->hb_responded = 1; 1688 sctp_calculate_rto(stcb, asoc, net, &old, 1689 SCTP_RTT_FROM_NON_DATA); 1690 1691 if (stcb->asoc.sctp_autoclose_ticks && 1692 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1693 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1694 inp, stcb, NULL); 1695 } 1696 break; 1697 default: 1698 /* 1699 * we're in the OPEN state (or beyond), so peer must 1700 * have simply lost the COOKIE-ACK 1701 */ 1702 break; 1703 } /* end switch */ 1704 sctp_stop_all_cookie_timers(stcb); 1705 /* 1706 * We ignore the return code here.. not sure if we should 1707 * somehow abort.. but we do have an existing asoc. This 1708 * really should not fail. 1709 */ 1710 if (sctp_load_addresses_from_init(stcb, m, 1711 init_offset + sizeof(struct sctp_init_chunk), 1712 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1713 if (how_indx < sizeof(asoc->cookie_how)) 1714 asoc->cookie_how[how_indx] = 4; 1715 return (NULL); 1716 } 1717 /* respond with a COOKIE-ACK */ 1718 sctp_toss_old_cookies(stcb, asoc); 1719 sctp_send_cookie_ack(stcb); 1720 if (how_indx < sizeof(asoc->cookie_how)) 1721 asoc->cookie_how[how_indx] = 5; 1722 return (stcb); 1723 } 1724 1725 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1726 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1727 cookie->tie_tag_my_vtag == 0 && 1728 cookie->tie_tag_peer_vtag == 0) { 1729 /* 1730 * case C in Section 5.2.4 Table 2: XMOO silently discard 1731 */ 1732 if (how_indx < sizeof(asoc->cookie_how)) 1733 asoc->cookie_how[how_indx] = 6; 1734 return (NULL); 1735 } 1736 /* 1737 * If nat support, and the below and stcb is established, send back 1738 * a ABORT(colliding state) if we are established. 1739 */ 1740 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1741 (asoc->peer_supports_nat) && 1742 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1743 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1744 (asoc->peer_vtag == 0)))) { 1745 /* 1746 * Special case - Peer's support nat. We may have two init's 1747 * that we gave out the same tag on since one was not 1748 * established.. i.e. we get INIT from host-1 behind the nat 1749 * and we respond tag-a, we get a INIT from host-2 behind 1750 * the nat and we get tag-a again. Then we bring up host-1 1751 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1752 * Now we have colliding state. We must send an abort here 1753 * with colliding state indication. 1754 */ 1755 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1756 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1757 mflowtype, mflowid, inp->fibnum, 1758 vrf_id, port); 1759 return (NULL); 1760 } 1761 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1762 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1763 (asoc->peer_vtag == 0))) { 1764 /* 1765 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1766 * should be ok, re-accept peer info 1767 */ 1768 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1769 /* 1770 * Extension of case C. If we hit this, then the 1771 * random number generator returned the same vtag 1772 * when we first sent our INIT-ACK and when we later 1773 * sent our INIT. The side with the seq numbers that 1774 * are different will be the one that normnally 1775 * would have hit case C. This in effect "extends" 1776 * our vtags in this collision case to be 64 bits. 1777 * The same collision could occur aka you get both 1778 * vtag and seq number the same twice in a row.. but 1779 * is much less likely. If it did happen then we 1780 * would proceed through and bring up the assoc.. we 1781 * may end up with the wrong stream setup however.. 1782 * which would be bad.. but there is no way to 1783 * tell.. until we send on a stream that does not 1784 * exist :-) 1785 */ 1786 if (how_indx < sizeof(asoc->cookie_how)) 1787 asoc->cookie_how[how_indx] = 7; 1788 1789 return (NULL); 1790 } 1791 if (how_indx < sizeof(asoc->cookie_how)) 1792 asoc->cookie_how[how_indx] = 8; 1793 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1794 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1795 sctp_stop_all_cookie_timers(stcb); 1796 /* 1797 * since we did not send a HB make sure we don't double 1798 * things 1799 */ 1800 net->hb_responded = 1; 1801 if (stcb->asoc.sctp_autoclose_ticks && 1802 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1803 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1804 NULL); 1805 } 1806 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1807 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1808 1809 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1810 /* 1811 * Ok the peer probably discarded our data (if we 1812 * echoed a cookie+data). So anything on the 1813 * sent_queue should be marked for retransmit, we 1814 * may not get something to kick us so it COULD 1815 * still take a timeout to move these.. but it can't 1816 * hurt to mark them. 1817 */ 1818 struct sctp_tmit_chunk *chk; 1819 1820 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1821 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1822 chk->sent = SCTP_DATAGRAM_RESEND; 1823 sctp_flight_size_decrease(chk); 1824 sctp_total_flight_decrease(stcb, chk); 1825 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1826 spec_flag++; 1827 } 1828 } 1829 1830 } 1831 /* process the INIT info (peer's info) */ 1832 retval = sctp_process_init(init_cp, stcb); 1833 if (retval < 0) { 1834 if (how_indx < sizeof(asoc->cookie_how)) 1835 asoc->cookie_how[how_indx] = 9; 1836 return (NULL); 1837 } 1838 if (sctp_load_addresses_from_init(stcb, m, 1839 init_offset + sizeof(struct sctp_init_chunk), 1840 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1841 if (how_indx < sizeof(asoc->cookie_how)) 1842 asoc->cookie_how[how_indx] = 10; 1843 return (NULL); 1844 } 1845 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1846 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1847 *notification = SCTP_NOTIFY_ASSOC_UP; 1848 1849 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1850 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1851 (!SCTP_IS_LISTENING(inp))) { 1852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1853 struct socket *so; 1854 #endif 1855 stcb->sctp_ep->sctp_flags |= 1856 SCTP_PCB_FLAGS_CONNECTED; 1857 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1858 so = SCTP_INP_SO(stcb->sctp_ep); 1859 atomic_add_int(&stcb->asoc.refcnt, 1); 1860 SCTP_TCB_UNLOCK(stcb); 1861 SCTP_SOCKET_LOCK(so, 1); 1862 SCTP_TCB_LOCK(stcb); 1863 atomic_add_int(&stcb->asoc.refcnt, -1); 1864 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1865 SCTP_SOCKET_UNLOCK(so, 1); 1866 return (NULL); 1867 } 1868 #endif 1869 soisconnected(stcb->sctp_socket); 1870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1871 SCTP_SOCKET_UNLOCK(so, 1); 1872 #endif 1873 } 1874 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1875 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1876 else 1877 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1878 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1879 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1880 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1881 } else { 1882 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1883 } 1884 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1885 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1886 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1887 stcb->sctp_ep, stcb, NULL); 1888 } 1889 sctp_stop_all_cookie_timers(stcb); 1890 sctp_toss_old_cookies(stcb, asoc); 1891 sctp_send_cookie_ack(stcb); 1892 if (spec_flag) { 1893 /* 1894 * only if we have retrans set do we do this. What 1895 * this call does is get only the COOKIE-ACK out and 1896 * then when we return the normal call to 1897 * sctp_chunk_output will get the retrans out behind 1898 * this. 1899 */ 1900 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1901 } 1902 if (how_indx < sizeof(asoc->cookie_how)) 1903 asoc->cookie_how[how_indx] = 11; 1904 1905 return (stcb); 1906 } 1907 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1908 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1909 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1910 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1911 cookie->tie_tag_peer_vtag != 0) { 1912 struct sctpasochead *head; 1913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1914 struct socket *so; 1915 #endif 1916 1917 if (asoc->peer_supports_nat) { 1918 /* 1919 * This is a gross gross hack. Just call the 1920 * cookie_new code since we are allowing a duplicate 1921 * association. I hope this works... 1922 */ 1923 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1924 sh, cookie, cookie_len, 1925 inp, netp, init_src, notification, 1926 auth_skipped, auth_offset, auth_len, 1927 mflowtype, mflowid, 1928 vrf_id, port)); 1929 } 1930 /* 1931 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1932 */ 1933 /* temp code */ 1934 if (how_indx < sizeof(asoc->cookie_how)) 1935 asoc->cookie_how[how_indx] = 12; 1936 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1937 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1938 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1939 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1940 1941 /* notify upper layer */ 1942 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1943 atomic_add_int(&stcb->asoc.refcnt, 1); 1944 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1945 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1946 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1947 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1948 } 1949 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1950 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1951 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1952 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1953 } 1954 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1955 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1956 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1957 stcb->sctp_ep, stcb, NULL); 1958 1959 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1960 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1961 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1962 } 1963 asoc->pre_open_streams = 1964 ntohs(initack_cp->init.num_outbound_streams); 1965 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1966 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1967 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1968 1969 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1970 1971 asoc->str_reset_seq_in = asoc->init_seq_number; 1972 1973 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1974 if (asoc->mapping_array) { 1975 memset(asoc->mapping_array, 0, 1976 asoc->mapping_array_size); 1977 } 1978 if (asoc->nr_mapping_array) { 1979 memset(asoc->nr_mapping_array, 0, 1980 asoc->mapping_array_size); 1981 } 1982 SCTP_TCB_UNLOCK(stcb); 1983 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1984 so = SCTP_INP_SO(stcb->sctp_ep); 1985 SCTP_SOCKET_LOCK(so, 1); 1986 #endif 1987 SCTP_INP_INFO_WLOCK(); 1988 SCTP_INP_WLOCK(stcb->sctp_ep); 1989 SCTP_TCB_LOCK(stcb); 1990 atomic_add_int(&stcb->asoc.refcnt, -1); 1991 /* send up all the data */ 1992 SCTP_TCB_SEND_LOCK(stcb); 1993 1994 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1995 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1996 stcb->asoc.strmout[i].chunks_on_queues = 0; 1997 #if defined(SCTP_DETAILED_STR_STATS) 1998 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1999 asoc->strmout[i].abandoned_sent[j] = 0; 2000 asoc->strmout[i].abandoned_unsent[j] = 0; 2001 } 2002 #else 2003 asoc->strmout[i].abandoned_sent[0] = 0; 2004 asoc->strmout[i].abandoned_unsent[0] = 0; 2005 #endif 2006 stcb->asoc.strmout[i].sid = i; 2007 stcb->asoc.strmout[i].next_mid_ordered = 0; 2008 stcb->asoc.strmout[i].next_mid_unordered = 0; 2009 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2010 } 2011 /* process the INIT-ACK info (my info) */ 2012 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2013 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2014 2015 /* pull from vtag hash */ 2016 LIST_REMOVE(stcb, sctp_asocs); 2017 /* re-insert to new vtag position */ 2018 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2019 SCTP_BASE_INFO(hashasocmark))]; 2020 /* 2021 * put it in the bucket in the vtag hash of assoc's for the 2022 * system 2023 */ 2024 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2025 2026 SCTP_TCB_SEND_UNLOCK(stcb); 2027 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2028 SCTP_INP_INFO_WUNLOCK(); 2029 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2030 SCTP_SOCKET_UNLOCK(so, 1); 2031 #endif 2032 asoc->total_flight = 0; 2033 asoc->total_flight_count = 0; 2034 /* process the INIT info (peer's info) */ 2035 retval = sctp_process_init(init_cp, stcb); 2036 if (retval < 0) { 2037 if (how_indx < sizeof(asoc->cookie_how)) 2038 asoc->cookie_how[how_indx] = 13; 2039 2040 return (NULL); 2041 } 2042 /* 2043 * since we did not send a HB make sure we don't double 2044 * things 2045 */ 2046 net->hb_responded = 1; 2047 2048 if (sctp_load_addresses_from_init(stcb, m, 2049 init_offset + sizeof(struct sctp_init_chunk), 2050 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2051 if (how_indx < sizeof(asoc->cookie_how)) 2052 asoc->cookie_how[how_indx] = 14; 2053 2054 return (NULL); 2055 } 2056 /* respond with a COOKIE-ACK */ 2057 sctp_stop_all_cookie_timers(stcb); 2058 sctp_toss_old_cookies(stcb, asoc); 2059 sctp_send_cookie_ack(stcb); 2060 if (how_indx < sizeof(asoc->cookie_how)) 2061 asoc->cookie_how[how_indx] = 15; 2062 2063 return (stcb); 2064 } 2065 if (how_indx < sizeof(asoc->cookie_how)) 2066 asoc->cookie_how[how_indx] = 16; 2067 /* all other cases... */ 2068 return (NULL); 2069 } 2070 2071 2072 /* 2073 * handle a state cookie for a new association m: input packet mbuf chain-- 2074 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2075 * and the cookie signature does not exist offset: offset into mbuf to the 2076 * cookie-echo chunk length: length of the cookie chunk to: where the init 2077 * was from returns a new TCB 2078 */ 2079 static struct sctp_tcb * 2080 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2081 struct sockaddr *src, struct sockaddr *dst, 2082 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2083 struct sctp_inpcb *inp, struct sctp_nets **netp, 2084 struct sockaddr *init_src, int *notification, 2085 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2086 uint8_t mflowtype, uint32_t mflowid, 2087 uint32_t vrf_id, uint16_t port) 2088 { 2089 struct sctp_tcb *stcb; 2090 struct sctp_init_chunk *init_cp, init_buf; 2091 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2092 union sctp_sockstore store; 2093 struct sctp_association *asoc; 2094 int init_offset, initack_offset, initack_limit; 2095 int retval; 2096 int error = 0; 2097 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2098 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2099 struct socket *so; 2100 2101 so = SCTP_INP_SO(inp); 2102 #endif 2103 2104 /* 2105 * find and validate the INIT chunk in the cookie (peer's info) the 2106 * INIT should start after the cookie-echo header struct (chunk 2107 * header, state cookie header struct) 2108 */ 2109 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2110 init_cp = (struct sctp_init_chunk *) 2111 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2112 (uint8_t *)&init_buf); 2113 if (init_cp == NULL) { 2114 /* could not pull a INIT chunk in cookie */ 2115 SCTPDBG(SCTP_DEBUG_INPUT1, 2116 "process_cookie_new: could not pull INIT chunk hdr\n"); 2117 return (NULL); 2118 } 2119 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2120 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2121 return (NULL); 2122 } 2123 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2124 /* 2125 * find and validate the INIT-ACK chunk in the cookie (my info) the 2126 * INIT-ACK follows the INIT chunk 2127 */ 2128 initack_cp = (struct sctp_init_ack_chunk *) 2129 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2130 (uint8_t *)&initack_buf); 2131 if (initack_cp == NULL) { 2132 /* could not pull INIT-ACK chunk in cookie */ 2133 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2134 return (NULL); 2135 } 2136 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2137 return (NULL); 2138 } 2139 /* 2140 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2141 * "initack_limit" value. This is because the chk_length field 2142 * includes the length of the cookie, but the cookie is omitted when 2143 * the INIT and INIT_ACK are tacked onto the cookie... 2144 */ 2145 initack_limit = offset + cookie_len; 2146 2147 /* 2148 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2149 * and popluate 2150 */ 2151 2152 /* 2153 * Here we do a trick, we set in NULL for the proc/thread argument. 2154 * We do this since in effect we only use the p argument when the 2155 * socket is unbound and we must do an implicit bind. Since we are 2156 * getting a cookie, we cannot be unbound. 2157 */ 2158 stcb = sctp_aloc_assoc(inp, init_src, &error, 2159 ntohl(initack_cp->init.initiate_tag), vrf_id, 2160 ntohs(initack_cp->init.num_outbound_streams), 2161 port, 2162 (struct thread *)NULL, 2163 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2164 if (stcb == NULL) { 2165 struct mbuf *op_err; 2166 2167 /* memory problem? */ 2168 SCTPDBG(SCTP_DEBUG_INPUT1, 2169 "process_cookie_new: no room for another TCB!\n"); 2170 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2171 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2172 src, dst, sh, op_err, 2173 mflowtype, mflowid, 2174 vrf_id, port); 2175 return (NULL); 2176 } 2177 /* get the correct sctp_nets */ 2178 if (netp) 2179 *netp = sctp_findnet(stcb, init_src); 2180 2181 asoc = &stcb->asoc; 2182 /* get scope variables out of cookie */ 2183 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2184 asoc->scope.site_scope = cookie->site_scope; 2185 asoc->scope.local_scope = cookie->local_scope; 2186 asoc->scope.loopback_scope = cookie->loopback_scope; 2187 2188 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2189 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2190 struct mbuf *op_err; 2191 2192 /* 2193 * Houston we have a problem. The EP changed while the 2194 * cookie was in flight. Only recourse is to abort the 2195 * association. 2196 */ 2197 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2198 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2199 src, dst, sh, op_err, 2200 mflowtype, mflowid, 2201 vrf_id, port); 2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2203 atomic_add_int(&stcb->asoc.refcnt, 1); 2204 SCTP_TCB_UNLOCK(stcb); 2205 SCTP_SOCKET_LOCK(so, 1); 2206 SCTP_TCB_LOCK(stcb); 2207 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2208 #endif 2209 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2210 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2212 SCTP_SOCKET_UNLOCK(so, 1); 2213 #endif 2214 return (NULL); 2215 } 2216 /* process the INIT-ACK info (my info) */ 2217 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2218 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2219 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2220 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2221 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2222 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2223 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2224 asoc->str_reset_seq_in = asoc->init_seq_number; 2225 2226 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2227 2228 /* process the INIT info (peer's info) */ 2229 if (netp) 2230 retval = sctp_process_init(init_cp, stcb); 2231 else 2232 retval = 0; 2233 if (retval < 0) { 2234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2235 atomic_add_int(&stcb->asoc.refcnt, 1); 2236 SCTP_TCB_UNLOCK(stcb); 2237 SCTP_SOCKET_LOCK(so, 1); 2238 SCTP_TCB_LOCK(stcb); 2239 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2240 #endif 2241 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2242 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2243 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2244 SCTP_SOCKET_UNLOCK(so, 1); 2245 #endif 2246 return (NULL); 2247 } 2248 /* load all addresses */ 2249 if (sctp_load_addresses_from_init(stcb, m, 2250 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2251 src, dst, init_src, port)) { 2252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2253 atomic_add_int(&stcb->asoc.refcnt, 1); 2254 SCTP_TCB_UNLOCK(stcb); 2255 SCTP_SOCKET_LOCK(so, 1); 2256 SCTP_TCB_LOCK(stcb); 2257 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2258 #endif 2259 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2260 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2262 SCTP_SOCKET_UNLOCK(so, 1); 2263 #endif 2264 return (NULL); 2265 } 2266 /* 2267 * verify any preceding AUTH chunk that was skipped 2268 */ 2269 /* pull the local authentication parameters from the cookie/init-ack */ 2270 sctp_auth_get_cookie_params(stcb, m, 2271 initack_offset + sizeof(struct sctp_init_ack_chunk), 2272 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2273 if (auth_skipped) { 2274 struct sctp_auth_chunk *auth; 2275 2276 auth = (struct sctp_auth_chunk *) 2277 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2278 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2279 /* auth HMAC failed, dump the assoc and packet */ 2280 SCTPDBG(SCTP_DEBUG_AUTH1, 2281 "COOKIE-ECHO: AUTH failed\n"); 2282 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2283 atomic_add_int(&stcb->asoc.refcnt, 1); 2284 SCTP_TCB_UNLOCK(stcb); 2285 SCTP_SOCKET_LOCK(so, 1); 2286 SCTP_TCB_LOCK(stcb); 2287 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2288 #endif 2289 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2290 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2291 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2292 SCTP_SOCKET_UNLOCK(so, 1); 2293 #endif 2294 return (NULL); 2295 } else { 2296 /* remaining chunks checked... good to go */ 2297 stcb->asoc.authenticated = 1; 2298 } 2299 } 2300 2301 /* 2302 * if we're doing ASCONFs, check to see if we have any new local 2303 * addresses that need to get added to the peer (eg. addresses 2304 * changed while cookie echo in flight). This needs to be done 2305 * after we go to the OPEN state to do the correct asconf 2306 * processing. else, make sure we have the correct addresses in our 2307 * lists 2308 */ 2309 2310 /* warning, we re-use sin, sin6, sa_store here! */ 2311 /* pull in local_address (our "from" address) */ 2312 switch (cookie->laddr_type) { 2313 #ifdef INET 2314 case SCTP_IPV4_ADDRESS: 2315 /* source addr is IPv4 */ 2316 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2317 store.sin.sin_family = AF_INET; 2318 store.sin.sin_len = sizeof(struct sockaddr_in); 2319 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2320 break; 2321 #endif 2322 #ifdef INET6 2323 case SCTP_IPV6_ADDRESS: 2324 /* source addr is IPv6 */ 2325 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2326 store.sin6.sin6_family = AF_INET6; 2327 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2328 store.sin6.sin6_scope_id = cookie->scope_id; 2329 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2330 break; 2331 #endif 2332 default: 2333 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2334 atomic_add_int(&stcb->asoc.refcnt, 1); 2335 SCTP_TCB_UNLOCK(stcb); 2336 SCTP_SOCKET_LOCK(so, 1); 2337 SCTP_TCB_LOCK(stcb); 2338 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2339 #endif 2340 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2341 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2342 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2343 SCTP_SOCKET_UNLOCK(so, 1); 2344 #endif 2345 return (NULL); 2346 } 2347 2348 /* update current state */ 2349 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2350 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2351 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2352 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2353 stcb->sctp_ep, stcb, NULL); 2354 } 2355 sctp_stop_all_cookie_timers(stcb); 2356 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2357 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2358 2359 /* set up to notify upper layer */ 2360 *notification = SCTP_NOTIFY_ASSOC_UP; 2361 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2362 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2363 (!SCTP_IS_LISTENING(inp))) { 2364 /* 2365 * This is an endpoint that called connect() how it got a 2366 * cookie that is NEW is a bit of a mystery. It must be that 2367 * the INIT was sent, but before it got there.. a complete 2368 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2369 * should have went to the other code.. not here.. oh well.. 2370 * a bit of protection is worth having.. 2371 */ 2372 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2373 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2374 atomic_add_int(&stcb->asoc.refcnt, 1); 2375 SCTP_TCB_UNLOCK(stcb); 2376 SCTP_SOCKET_LOCK(so, 1); 2377 SCTP_TCB_LOCK(stcb); 2378 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2379 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2380 SCTP_SOCKET_UNLOCK(so, 1); 2381 return (NULL); 2382 } 2383 #endif 2384 soisconnected(stcb->sctp_socket); 2385 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2386 SCTP_SOCKET_UNLOCK(so, 1); 2387 #endif 2388 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2389 (SCTP_IS_LISTENING(inp))) { 2390 /* 2391 * We don't want to do anything with this one. Since it is 2392 * the listening guy. The timer will get started for 2393 * accepted connections in the caller. 2394 */ 2395 ; 2396 } 2397 /* since we did not send a HB make sure we don't double things */ 2398 if ((netp) && (*netp)) 2399 (*netp)->hb_responded = 1; 2400 2401 if (stcb->asoc.sctp_autoclose_ticks && 2402 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2403 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2404 } 2405 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2406 if ((netp != NULL) && (*netp != NULL)) { 2407 struct timeval old; 2408 2409 /* calculate the RTT and set the encaps port */ 2410 old.tv_sec = cookie->time_entered.tv_sec; 2411 old.tv_usec = cookie->time_entered.tv_usec; 2412 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2413 } 2414 /* respond with a COOKIE-ACK */ 2415 sctp_send_cookie_ack(stcb); 2416 2417 /* 2418 * check the address lists for any ASCONFs that need to be sent 2419 * AFTER the cookie-ack is sent 2420 */ 2421 sctp_check_address_list(stcb, m, 2422 initack_offset + sizeof(struct sctp_init_ack_chunk), 2423 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2424 &store.sa, cookie->local_scope, cookie->site_scope, 2425 cookie->ipv4_scope, cookie->loopback_scope); 2426 2427 2428 return (stcb); 2429 } 2430 2431 /* 2432 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2433 * we NEED to make sure we are not already using the vtag. If so we 2434 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2435 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2436 SCTP_BASE_INFO(hashasocmark))]; 2437 LIST_FOREACH(stcb, head, sctp_asocs) { 2438 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2439 -- SEND ABORT - TRY AGAIN -- 2440 } 2441 } 2442 */ 2443 2444 /* 2445 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2446 * existing (non-NULL) TCB 2447 */ 2448 static struct mbuf * 2449 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2450 struct sockaddr *src, struct sockaddr *dst, 2451 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2452 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2453 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2454 struct sctp_tcb **locked_tcb, 2455 uint8_t mflowtype, uint32_t mflowid, 2456 uint32_t vrf_id, uint16_t port) 2457 { 2458 struct sctp_state_cookie *cookie; 2459 struct sctp_tcb *l_stcb = *stcb; 2460 struct sctp_inpcb *l_inp; 2461 struct sockaddr *to; 2462 struct sctp_pcb *ep; 2463 struct mbuf *m_sig; 2464 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2465 uint8_t *sig; 2466 uint8_t cookie_ok = 0; 2467 unsigned int sig_offset, cookie_offset; 2468 unsigned int cookie_len; 2469 struct timeval now; 2470 struct timeval time_expires; 2471 int notification = 0; 2472 struct sctp_nets *netl; 2473 int had_a_existing_tcb = 0; 2474 int send_int_conf = 0; 2475 #ifdef INET 2476 struct sockaddr_in sin; 2477 #endif 2478 #ifdef INET6 2479 struct sockaddr_in6 sin6; 2480 #endif 2481 2482 SCTPDBG(SCTP_DEBUG_INPUT2, 2483 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2484 2485 if (inp_p == NULL) { 2486 return (NULL); 2487 } 2488 cookie = &cp->cookie; 2489 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2490 cookie_len = ntohs(cp->ch.chunk_length); 2491 2492 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2493 sizeof(struct sctp_init_chunk) + 2494 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2495 /* cookie too small */ 2496 return (NULL); 2497 } 2498 if ((cookie->peerport != sh->src_port) || 2499 (cookie->myport != sh->dest_port) || 2500 (cookie->my_vtag != sh->v_tag)) { 2501 /* 2502 * invalid ports or bad tag. Note that we always leave the 2503 * v_tag in the header in network order and when we stored 2504 * it in the my_vtag slot we also left it in network order. 2505 * This maintains the match even though it may be in the 2506 * opposite byte order of the machine :-> 2507 */ 2508 return (NULL); 2509 } 2510 /* 2511 * split off the signature into its own mbuf (since it should not be 2512 * calculated in the sctp_hmac_m() call). 2513 */ 2514 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2515 m_sig = m_split(m, sig_offset, M_NOWAIT); 2516 if (m_sig == NULL) { 2517 /* out of memory or ?? */ 2518 return (NULL); 2519 } 2520 #ifdef SCTP_MBUF_LOGGING 2521 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2522 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2523 } 2524 #endif 2525 2526 /* 2527 * compute the signature/digest for the cookie 2528 */ 2529 ep = &(*inp_p)->sctp_ep; 2530 l_inp = *inp_p; 2531 if (l_stcb) { 2532 SCTP_TCB_UNLOCK(l_stcb); 2533 } 2534 SCTP_INP_RLOCK(l_inp); 2535 if (l_stcb) { 2536 SCTP_TCB_LOCK(l_stcb); 2537 } 2538 /* which cookie is it? */ 2539 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2540 (ep->current_secret_number != ep->last_secret_number)) { 2541 /* it's the old cookie */ 2542 (void)sctp_hmac_m(SCTP_HMAC, 2543 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2544 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2545 } else { 2546 /* it's the current cookie */ 2547 (void)sctp_hmac_m(SCTP_HMAC, 2548 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2549 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2550 } 2551 /* get the signature */ 2552 SCTP_INP_RUNLOCK(l_inp); 2553 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2554 if (sig == NULL) { 2555 /* couldn't find signature */ 2556 sctp_m_freem(m_sig); 2557 return (NULL); 2558 } 2559 /* compare the received digest with the computed digest */ 2560 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2561 /* try the old cookie? */ 2562 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2563 (ep->current_secret_number != ep->last_secret_number)) { 2564 /* compute digest with old */ 2565 (void)sctp_hmac_m(SCTP_HMAC, 2566 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2567 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2568 /* compare */ 2569 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2570 cookie_ok = 1; 2571 } 2572 } else { 2573 cookie_ok = 1; 2574 } 2575 2576 /* 2577 * Now before we continue we must reconstruct our mbuf so that 2578 * normal processing of any other chunks will work. 2579 */ 2580 { 2581 struct mbuf *m_at; 2582 2583 m_at = m; 2584 while (SCTP_BUF_NEXT(m_at) != NULL) { 2585 m_at = SCTP_BUF_NEXT(m_at); 2586 } 2587 SCTP_BUF_NEXT(m_at) = m_sig; 2588 } 2589 2590 if (cookie_ok == 0) { 2591 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2592 SCTPDBG(SCTP_DEBUG_INPUT2, 2593 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2594 (uint32_t)offset, cookie_offset, sig_offset); 2595 return (NULL); 2596 } 2597 2598 /* 2599 * check the cookie timestamps to be sure it's not stale 2600 */ 2601 (void)SCTP_GETTIME_TIMEVAL(&now); 2602 /* Expire time is in Ticks, so we convert to seconds */ 2603 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2604 time_expires.tv_usec = cookie->time_entered.tv_usec; 2605 if (timevalcmp(&now, &time_expires, >)) { 2606 /* cookie is stale! */ 2607 struct mbuf *op_err; 2608 struct sctp_error_stale_cookie *cause; 2609 struct timeval diff; 2610 uint32_t staleness; 2611 2612 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2613 0, M_NOWAIT, 1, MT_DATA); 2614 if (op_err == NULL) { 2615 /* FOOBAR */ 2616 return (NULL); 2617 } 2618 /* Set the len */ 2619 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2620 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2621 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2622 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2623 (sizeof(uint32_t)))); 2624 diff = now; 2625 timevalsub(&diff, &time_expires); 2626 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2627 staleness = UINT32_MAX; 2628 } else { 2629 staleness = diff.tv_sec * 1000000; 2630 } 2631 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2632 staleness += diff.tv_usec; 2633 } else { 2634 staleness = UINT32_MAX; 2635 } 2636 cause->stale_time = htonl(staleness); 2637 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2638 mflowtype, mflowid, l_inp->fibnum, 2639 vrf_id, port); 2640 return (NULL); 2641 } 2642 /* 2643 * Now we must see with the lookup address if we have an existing 2644 * asoc. This will only happen if we were in the COOKIE-WAIT state 2645 * and a INIT collided with us and somewhere the peer sent the 2646 * cookie on another address besides the single address our assoc 2647 * had for him. In this case we will have one of the tie-tags set at 2648 * least AND the address field in the cookie can be used to look it 2649 * up. 2650 */ 2651 to = NULL; 2652 switch (cookie->addr_type) { 2653 #ifdef INET6 2654 case SCTP_IPV6_ADDRESS: 2655 memset(&sin6, 0, sizeof(sin6)); 2656 sin6.sin6_family = AF_INET6; 2657 sin6.sin6_len = sizeof(sin6); 2658 sin6.sin6_port = sh->src_port; 2659 sin6.sin6_scope_id = cookie->scope_id; 2660 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2661 sizeof(sin6.sin6_addr.s6_addr)); 2662 to = (struct sockaddr *)&sin6; 2663 break; 2664 #endif 2665 #ifdef INET 2666 case SCTP_IPV4_ADDRESS: 2667 memset(&sin, 0, sizeof(sin)); 2668 sin.sin_family = AF_INET; 2669 sin.sin_len = sizeof(sin); 2670 sin.sin_port = sh->src_port; 2671 sin.sin_addr.s_addr = cookie->address[0]; 2672 to = (struct sockaddr *)&sin; 2673 break; 2674 #endif 2675 default: 2676 /* This should not happen */ 2677 return (NULL); 2678 } 2679 if (*stcb == NULL) { 2680 /* Yep, lets check */ 2681 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2682 if (*stcb == NULL) { 2683 /* 2684 * We should have only got back the same inp. If we 2685 * got back a different ep we have a problem. The 2686 * original findep got back l_inp and now 2687 */ 2688 if (l_inp != *inp_p) { 2689 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2690 } 2691 } else { 2692 if (*locked_tcb == NULL) { 2693 /* 2694 * In this case we found the assoc only 2695 * after we locked the create lock. This 2696 * means we are in a colliding case and we 2697 * must make sure that we unlock the tcb if 2698 * its one of the cases where we throw away 2699 * the incoming packets. 2700 */ 2701 *locked_tcb = *stcb; 2702 2703 /* 2704 * We must also increment the inp ref count 2705 * since the ref_count flags was set when we 2706 * did not find the TCB, now we found it 2707 * which reduces the refcount.. we must 2708 * raise it back out to balance it all :-) 2709 */ 2710 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2711 if ((*stcb)->sctp_ep != l_inp) { 2712 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2713 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2714 } 2715 } 2716 } 2717 } 2718 2719 cookie_len -= SCTP_SIGNATURE_SIZE; 2720 if (*stcb == NULL) { 2721 /* this is the "normal" case... get a new TCB */ 2722 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2723 cookie, cookie_len, *inp_p, 2724 netp, to, ¬ification, 2725 auth_skipped, auth_offset, auth_len, 2726 mflowtype, mflowid, 2727 vrf_id, port); 2728 } else { 2729 /* this is abnormal... cookie-echo on existing TCB */ 2730 had_a_existing_tcb = 1; 2731 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2732 src, dst, sh, 2733 cookie, cookie_len, *inp_p, *stcb, netp, to, 2734 ¬ification, auth_skipped, auth_offset, auth_len, 2735 mflowtype, mflowid, 2736 vrf_id, port); 2737 } 2738 2739 if (*stcb == NULL) { 2740 /* still no TCB... must be bad cookie-echo */ 2741 return (NULL); 2742 } 2743 if (*netp != NULL) { 2744 (*netp)->flowtype = mflowtype; 2745 (*netp)->flowid = mflowid; 2746 } 2747 /* 2748 * Ok, we built an association so confirm the address we sent the 2749 * INIT-ACK to. 2750 */ 2751 netl = sctp_findnet(*stcb, to); 2752 /* 2753 * This code should in theory NOT run but 2754 */ 2755 if (netl == NULL) { 2756 /* TSNH! Huh, why do I need to add this address here? */ 2757 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2758 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2759 return (NULL); 2760 } 2761 netl = sctp_findnet(*stcb, to); 2762 } 2763 if (netl) { 2764 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2765 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2766 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2767 netl); 2768 send_int_conf = 1; 2769 } 2770 } 2771 sctp_start_net_timers(*stcb); 2772 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2773 if (!had_a_existing_tcb || 2774 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2775 /* 2776 * If we have a NEW cookie or the connect never 2777 * reached the connected state during collision we 2778 * must do the TCP accept thing. 2779 */ 2780 struct socket *so, *oso; 2781 struct sctp_inpcb *inp; 2782 2783 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2784 /* 2785 * For a restart we will keep the same 2786 * socket, no need to do anything. I THINK!! 2787 */ 2788 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2789 if (send_int_conf) { 2790 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2791 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2792 } 2793 return (m); 2794 } 2795 oso = (*inp_p)->sctp_socket; 2796 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2797 SCTP_TCB_UNLOCK((*stcb)); 2798 CURVNET_SET(oso->so_vnet); 2799 so = sonewconn(oso, 0 2800 ); 2801 CURVNET_RESTORE(); 2802 SCTP_TCB_LOCK((*stcb)); 2803 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2804 2805 if (so == NULL) { 2806 struct mbuf *op_err; 2807 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2808 struct socket *pcb_so; 2809 #endif 2810 /* Too many sockets */ 2811 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2812 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2813 sctp_abort_association(*inp_p, NULL, m, iphlen, 2814 src, dst, sh, op_err, 2815 mflowtype, mflowid, 2816 vrf_id, port); 2817 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2818 pcb_so = SCTP_INP_SO(*inp_p); 2819 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2820 SCTP_TCB_UNLOCK((*stcb)); 2821 SCTP_SOCKET_LOCK(pcb_so, 1); 2822 SCTP_TCB_LOCK((*stcb)); 2823 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2824 #endif 2825 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2826 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2827 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2828 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2829 #endif 2830 return (NULL); 2831 } 2832 inp = (struct sctp_inpcb *)so->so_pcb; 2833 SCTP_INP_INCR_REF(inp); 2834 /* 2835 * We add the unbound flag here so that if we get an 2836 * soabort() before we get the move_pcb done, we 2837 * will properly cleanup. 2838 */ 2839 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2840 SCTP_PCB_FLAGS_CONNECTED | 2841 SCTP_PCB_FLAGS_IN_TCPPOOL | 2842 SCTP_PCB_FLAGS_UNBOUND | 2843 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2844 SCTP_PCB_FLAGS_DONT_WAKE); 2845 inp->sctp_features = (*inp_p)->sctp_features; 2846 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2847 inp->sctp_socket = so; 2848 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2849 inp->max_cwnd = (*inp_p)->max_cwnd; 2850 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2851 inp->ecn_supported = (*inp_p)->ecn_supported; 2852 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2853 inp->auth_supported = (*inp_p)->auth_supported; 2854 inp->asconf_supported = (*inp_p)->asconf_supported; 2855 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2856 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2857 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2858 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2859 inp->sctp_context = (*inp_p)->sctp_context; 2860 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2861 inp->fibnum = (*inp_p)->fibnum; 2862 inp->inp_starting_point_for_iterator = NULL; 2863 /* 2864 * copy in the authentication parameters from the 2865 * original endpoint 2866 */ 2867 if (inp->sctp_ep.local_hmacs) 2868 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2869 inp->sctp_ep.local_hmacs = 2870 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2871 if (inp->sctp_ep.local_auth_chunks) 2872 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2873 inp->sctp_ep.local_auth_chunks = 2874 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2875 2876 /* 2877 * Now we must move it from one hash table to 2878 * another and get the tcb in the right place. 2879 */ 2880 2881 /* 2882 * This is where the one-2-one socket is put into 2883 * the accept state waiting for the accept! 2884 */ 2885 if (*stcb) { 2886 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2887 } 2888 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2889 2890 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2891 SCTP_TCB_UNLOCK((*stcb)); 2892 2893 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2894 0); 2895 SCTP_TCB_LOCK((*stcb)); 2896 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2897 2898 2899 /* 2900 * now we must check to see if we were aborted while 2901 * the move was going on and the lock/unlock 2902 * happened. 2903 */ 2904 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2905 /* 2906 * yep it was, we leave the assoc attached 2907 * to the socket since the sctp_inpcb_free() 2908 * call will send an abort for us. 2909 */ 2910 SCTP_INP_DECR_REF(inp); 2911 return (NULL); 2912 } 2913 SCTP_INP_DECR_REF(inp); 2914 /* Switch over to the new guy */ 2915 *inp_p = inp; 2916 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2917 if (send_int_conf) { 2918 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2919 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2920 } 2921 2922 /* 2923 * Pull it from the incomplete queue and wake the 2924 * guy 2925 */ 2926 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2927 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2928 SCTP_TCB_UNLOCK((*stcb)); 2929 SCTP_SOCKET_LOCK(so, 1); 2930 #endif 2931 soisconnected(so); 2932 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2933 SCTP_TCB_LOCK((*stcb)); 2934 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2935 SCTP_SOCKET_UNLOCK(so, 1); 2936 #endif 2937 return (m); 2938 } 2939 } 2940 if (notification) { 2941 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2942 } 2943 if (send_int_conf) { 2944 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2945 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2946 } 2947 return (m); 2948 } 2949 2950 static void 2951 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2952 struct sctp_tcb *stcb, struct sctp_nets *net) 2953 { 2954 /* cp must not be used, others call this without a c-ack :-) */ 2955 struct sctp_association *asoc; 2956 2957 SCTPDBG(SCTP_DEBUG_INPUT2, 2958 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2959 if ((stcb == NULL) || (net == NULL)) { 2960 return; 2961 } 2962 2963 asoc = &stcb->asoc; 2964 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2965 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2966 asoc->overall_error_count, 2967 0, 2968 SCTP_FROM_SCTP_INPUT, 2969 __LINE__); 2970 } 2971 asoc->overall_error_count = 0; 2972 sctp_stop_all_cookie_timers(stcb); 2973 /* process according to association state */ 2974 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2975 /* state change only needed when I am in right state */ 2976 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2977 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2978 sctp_start_net_timers(stcb); 2979 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2980 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2981 stcb->sctp_ep, stcb, NULL); 2982 2983 } 2984 /* update RTO */ 2985 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2986 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2987 if (asoc->overall_error_count == 0) { 2988 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2989 SCTP_RTT_FROM_NON_DATA); 2990 } 2991 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2992 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2993 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2994 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2995 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2996 struct socket *so; 2997 2998 #endif 2999 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 3000 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3001 so = SCTP_INP_SO(stcb->sctp_ep); 3002 atomic_add_int(&stcb->asoc.refcnt, 1); 3003 SCTP_TCB_UNLOCK(stcb); 3004 SCTP_SOCKET_LOCK(so, 1); 3005 SCTP_TCB_LOCK(stcb); 3006 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3007 #endif 3008 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3009 soisconnected(stcb->sctp_socket); 3010 } 3011 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3012 SCTP_SOCKET_UNLOCK(so, 1); 3013 #endif 3014 } 3015 /* 3016 * since we did not send a HB make sure we don't double 3017 * things 3018 */ 3019 net->hb_responded = 1; 3020 3021 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3022 /* 3023 * We don't need to do the asconf thing, nor hb or 3024 * autoclose if the socket is closed. 3025 */ 3026 goto closed_socket; 3027 } 3028 3029 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3030 stcb, net); 3031 3032 3033 if (stcb->asoc.sctp_autoclose_ticks && 3034 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3035 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3036 stcb->sctp_ep, stcb, NULL); 3037 } 3038 /* 3039 * send ASCONF if parameters are pending and ASCONFs are 3040 * allowed (eg. addresses changed when init/cookie echo were 3041 * in flight) 3042 */ 3043 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3044 (stcb->asoc.asconf_supported == 1) && 3045 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3046 #ifdef SCTP_TIMER_BASED_ASCONF 3047 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3048 stcb->sctp_ep, stcb, 3049 stcb->asoc.primary_destination); 3050 #else 3051 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3052 SCTP_ADDR_NOT_LOCKED); 3053 #endif 3054 } 3055 } 3056 closed_socket: 3057 /* Toss the cookie if I can */ 3058 sctp_toss_old_cookies(stcb, asoc); 3059 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3060 /* Restart the timer if we have pending data */ 3061 struct sctp_tmit_chunk *chk; 3062 3063 chk = TAILQ_FIRST(&asoc->sent_queue); 3064 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3065 } 3066 } 3067 3068 static void 3069 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3070 struct sctp_tcb *stcb) 3071 { 3072 struct sctp_nets *net; 3073 struct sctp_tmit_chunk *lchk; 3074 struct sctp_ecne_chunk bkup; 3075 uint8_t override_bit; 3076 uint32_t tsn, window_data_tsn; 3077 int len; 3078 unsigned int pkt_cnt; 3079 3080 len = ntohs(cp->ch.chunk_length); 3081 if ((len != sizeof(struct sctp_ecne_chunk)) && 3082 (len != sizeof(struct old_sctp_ecne_chunk))) { 3083 return; 3084 } 3085 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3086 /* Its the old format */ 3087 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3088 bkup.num_pkts_since_cwr = htonl(1); 3089 cp = &bkup; 3090 } 3091 SCTP_STAT_INCR(sctps_recvecne); 3092 tsn = ntohl(cp->tsn); 3093 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3094 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3095 if (lchk == NULL) { 3096 window_data_tsn = stcb->asoc.sending_seq - 1; 3097 } else { 3098 window_data_tsn = lchk->rec.data.tsn; 3099 } 3100 3101 /* Find where it was sent to if possible. */ 3102 net = NULL; 3103 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3104 if (lchk->rec.data.tsn == tsn) { 3105 net = lchk->whoTo; 3106 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3107 break; 3108 } 3109 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3110 break; 3111 } 3112 } 3113 if (net == NULL) { 3114 /* 3115 * What to do. A previous send of a CWR was possibly lost. 3116 * See how old it is, we may have it marked on the actual 3117 * net. 3118 */ 3119 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3120 if (tsn == net->last_cwr_tsn) { 3121 /* Found him, send it off */ 3122 break; 3123 } 3124 } 3125 if (net == NULL) { 3126 /* 3127 * If we reach here, we need to send a special CWR 3128 * that says hey, we did this a long time ago and 3129 * you lost the response. 3130 */ 3131 net = TAILQ_FIRST(&stcb->asoc.nets); 3132 if (net == NULL) { 3133 /* TSNH */ 3134 return; 3135 } 3136 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3137 } else { 3138 override_bit = 0; 3139 } 3140 } else { 3141 override_bit = 0; 3142 } 3143 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3144 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3145 /* 3146 * JRS - Use the congestion control given in the pluggable 3147 * CC module 3148 */ 3149 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3150 /* 3151 * We reduce once every RTT. So we will only lower cwnd at 3152 * the next sending seq i.e. the window_data_tsn 3153 */ 3154 net->cwr_window_tsn = window_data_tsn; 3155 net->ecn_ce_pkt_cnt += pkt_cnt; 3156 net->lost_cnt = pkt_cnt; 3157 net->last_cwr_tsn = tsn; 3158 } else { 3159 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3160 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3161 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3162 /* 3163 * Another loss in the same window update how many 3164 * marks/packets lost we have had. 3165 */ 3166 int cnt = 1; 3167 3168 if (pkt_cnt > net->lost_cnt) { 3169 /* Should be the case */ 3170 cnt = (pkt_cnt - net->lost_cnt); 3171 net->ecn_ce_pkt_cnt += cnt; 3172 } 3173 net->lost_cnt = pkt_cnt; 3174 net->last_cwr_tsn = tsn; 3175 /* 3176 * Most CC functions will ignore this call, since we 3177 * are in-window yet of the initial CE the peer saw. 3178 */ 3179 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3180 } 3181 } 3182 /* 3183 * We always send a CWR this way if our previous one was lost our 3184 * peer will get an update, or if it is not time again to reduce we 3185 * still get the cwr to the peer. Note we set the override when we 3186 * could not find the TSN on the chunk or the destination network. 3187 */ 3188 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3189 } 3190 3191 static void 3192 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3193 { 3194 /* 3195 * Here we get a CWR from the peer. We must look in the outqueue and 3196 * make sure that we have a covered ECNE in the control chunk part. 3197 * If so remove it. 3198 */ 3199 struct sctp_tmit_chunk *chk, *nchk; 3200 struct sctp_ecne_chunk *ecne; 3201 int override; 3202 uint32_t cwr_tsn; 3203 3204 cwr_tsn = ntohl(cp->tsn); 3205 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3206 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3207 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3208 continue; 3209 } 3210 if ((override == 0) && (chk->whoTo != net)) { 3211 /* Must be from the right src unless override is set */ 3212 continue; 3213 } 3214 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3215 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3216 /* this covers this ECNE, we can remove it */ 3217 stcb->asoc.ecn_echo_cnt_onq--; 3218 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3219 sctp_next); 3220 stcb->asoc.ctrl_queue_cnt--; 3221 sctp_m_freem(chk->data); 3222 chk->data = NULL; 3223 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3224 if (override == 0) { 3225 break; 3226 } 3227 } 3228 } 3229 } 3230 3231 static void 3232 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3233 struct sctp_tcb *stcb, struct sctp_nets *net) 3234 { 3235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3236 struct socket *so; 3237 #endif 3238 3239 SCTPDBG(SCTP_DEBUG_INPUT2, 3240 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3241 if (stcb == NULL) 3242 return; 3243 3244 /* process according to association state */ 3245 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3246 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3247 SCTPDBG(SCTP_DEBUG_INPUT2, 3248 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3249 SCTP_TCB_UNLOCK(stcb); 3250 return; 3251 } 3252 /* notify upper layer protocol */ 3253 if (stcb->sctp_socket) { 3254 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3255 } 3256 #ifdef INVARIANTS 3257 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3258 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3259 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3260 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3261 } 3262 #endif 3263 /* stop the timer */ 3264 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3265 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3266 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3267 /* free the TCB */ 3268 SCTPDBG(SCTP_DEBUG_INPUT2, 3269 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3270 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3271 so = SCTP_INP_SO(stcb->sctp_ep); 3272 atomic_add_int(&stcb->asoc.refcnt, 1); 3273 SCTP_TCB_UNLOCK(stcb); 3274 SCTP_SOCKET_LOCK(so, 1); 3275 SCTP_TCB_LOCK(stcb); 3276 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3277 #endif 3278 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3279 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3280 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3281 SCTP_SOCKET_UNLOCK(so, 1); 3282 #endif 3283 return; 3284 } 3285 3286 static int 3287 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3288 struct sctp_nets *net, uint8_t flg) 3289 { 3290 switch (desc->chunk_type) { 3291 case SCTP_DATA: 3292 /* find the tsn to resend (possibly */ 3293 { 3294 uint32_t tsn; 3295 struct sctp_tmit_chunk *tp1; 3296 3297 tsn = ntohl(desc->tsn_ifany); 3298 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3299 if (tp1->rec.data.tsn == tsn) { 3300 /* found it */ 3301 break; 3302 } 3303 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3304 /* not found */ 3305 tp1 = NULL; 3306 break; 3307 } 3308 } 3309 if (tp1 == NULL) { 3310 /* 3311 * Do it the other way , aka without paying 3312 * attention to queue seq order. 3313 */ 3314 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3315 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3316 if (tp1->rec.data.tsn == tsn) { 3317 /* found it */ 3318 break; 3319 } 3320 } 3321 } 3322 if (tp1 == NULL) { 3323 SCTP_STAT_INCR(sctps_pdrptsnnf); 3324 } 3325 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3326 uint8_t *ddp; 3327 3328 if (((flg & SCTP_BADCRC) == 0) && 3329 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3330 return (0); 3331 } 3332 if ((stcb->asoc.peers_rwnd == 0) && 3333 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3334 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3335 return (0); 3336 } 3337 if (stcb->asoc.peers_rwnd == 0 && 3338 (flg & SCTP_FROM_MIDDLE_BOX)) { 3339 SCTP_STAT_INCR(sctps_pdrpdizrw); 3340 return (0); 3341 } 3342 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3343 sizeof(struct sctp_data_chunk)); 3344 { 3345 unsigned int iii; 3346 3347 for (iii = 0; iii < sizeof(desc->data_bytes); 3348 iii++) { 3349 if (ddp[iii] != desc->data_bytes[iii]) { 3350 SCTP_STAT_INCR(sctps_pdrpbadd); 3351 return (-1); 3352 } 3353 } 3354 } 3355 3356 if (tp1->do_rtt) { 3357 /* 3358 * this guy had a RTO calculation 3359 * pending on it, cancel it 3360 */ 3361 if (tp1->whoTo->rto_needed == 0) { 3362 tp1->whoTo->rto_needed = 1; 3363 } 3364 tp1->do_rtt = 0; 3365 } 3366 SCTP_STAT_INCR(sctps_pdrpmark); 3367 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3368 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3369 /* 3370 * mark it as if we were doing a FR, since 3371 * we will be getting gap ack reports behind 3372 * the info from the router. 3373 */ 3374 tp1->rec.data.doing_fast_retransmit = 1; 3375 /* 3376 * mark the tsn with what sequences can 3377 * cause a new FR. 3378 */ 3379 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3380 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3381 } else { 3382 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3383 } 3384 3385 /* restart the timer */ 3386 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3387 stcb, tp1->whoTo, 3388 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3389 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3390 stcb, tp1->whoTo); 3391 3392 /* fix counts and things */ 3393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3394 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3395 tp1->whoTo->flight_size, 3396 tp1->book_size, 3397 (uint32_t)(uintptr_t)stcb, 3398 tp1->rec.data.tsn); 3399 } 3400 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3401 sctp_flight_size_decrease(tp1); 3402 sctp_total_flight_decrease(stcb, tp1); 3403 } 3404 tp1->sent = SCTP_DATAGRAM_RESEND; 3405 } { 3406 /* audit code */ 3407 unsigned int audit; 3408 3409 audit = 0; 3410 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3411 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3412 audit++; 3413 } 3414 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3415 sctp_next) { 3416 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3417 audit++; 3418 } 3419 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3420 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3421 audit, stcb->asoc.sent_queue_retran_cnt); 3422 #ifndef SCTP_AUDITING_ENABLED 3423 stcb->asoc.sent_queue_retran_cnt = audit; 3424 #endif 3425 } 3426 } 3427 } 3428 break; 3429 case SCTP_ASCONF: 3430 { 3431 struct sctp_tmit_chunk *asconf; 3432 3433 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3434 sctp_next) { 3435 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3436 break; 3437 } 3438 } 3439 if (asconf) { 3440 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3441 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3442 asconf->sent = SCTP_DATAGRAM_RESEND; 3443 asconf->snd_count--; 3444 } 3445 } 3446 break; 3447 case SCTP_INITIATION: 3448 /* resend the INIT */ 3449 stcb->asoc.dropped_special_cnt++; 3450 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3451 /* 3452 * If we can get it in, in a few attempts we do 3453 * this, otherwise we let the timer fire. 3454 */ 3455 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3456 stcb, net, 3457 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3458 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3459 } 3460 break; 3461 case SCTP_SELECTIVE_ACK: 3462 case SCTP_NR_SELECTIVE_ACK: 3463 /* resend the sack */ 3464 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3465 break; 3466 case SCTP_HEARTBEAT_REQUEST: 3467 /* resend a demand HB */ 3468 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3469 /* 3470 * Only retransmit if we KNOW we wont destroy the 3471 * tcb 3472 */ 3473 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3474 } 3475 break; 3476 case SCTP_SHUTDOWN: 3477 sctp_send_shutdown(stcb, net); 3478 break; 3479 case SCTP_SHUTDOWN_ACK: 3480 sctp_send_shutdown_ack(stcb, net); 3481 break; 3482 case SCTP_COOKIE_ECHO: 3483 { 3484 struct sctp_tmit_chunk *cookie; 3485 3486 cookie = NULL; 3487 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3488 sctp_next) { 3489 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3490 break; 3491 } 3492 } 3493 if (cookie) { 3494 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3495 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3496 cookie->sent = SCTP_DATAGRAM_RESEND; 3497 sctp_stop_all_cookie_timers(stcb); 3498 } 3499 } 3500 break; 3501 case SCTP_COOKIE_ACK: 3502 sctp_send_cookie_ack(stcb); 3503 break; 3504 case SCTP_ASCONF_ACK: 3505 /* resend last asconf ack */ 3506 sctp_send_asconf_ack(stcb); 3507 break; 3508 case SCTP_IFORWARD_CUM_TSN: 3509 case SCTP_FORWARD_CUM_TSN: 3510 send_forward_tsn(stcb, &stcb->asoc); 3511 break; 3512 /* can't do anything with these */ 3513 case SCTP_PACKET_DROPPED: 3514 case SCTP_INITIATION_ACK: /* this should not happen */ 3515 case SCTP_HEARTBEAT_ACK: 3516 case SCTP_ABORT_ASSOCIATION: 3517 case SCTP_OPERATION_ERROR: 3518 case SCTP_SHUTDOWN_COMPLETE: 3519 case SCTP_ECN_ECHO: 3520 case SCTP_ECN_CWR: 3521 default: 3522 break; 3523 } 3524 return (0); 3525 } 3526 3527 void 3528 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3529 { 3530 uint32_t i; 3531 uint16_t temp; 3532 3533 /* 3534 * We set things to 0xffffffff since this is the last delivered 3535 * sequence and we will be sending in 0 after the reset. 3536 */ 3537 3538 if (number_entries) { 3539 for (i = 0; i < number_entries; i++) { 3540 temp = ntohs(list[i]); 3541 if (temp >= stcb->asoc.streamincnt) { 3542 continue; 3543 } 3544 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3545 } 3546 } else { 3547 list = NULL; 3548 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3549 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3550 } 3551 } 3552 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3553 } 3554 3555 static void 3556 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3557 { 3558 uint32_t i; 3559 uint16_t temp; 3560 3561 if (number_entries > 0) { 3562 for (i = 0; i < number_entries; i++) { 3563 temp = ntohs(list[i]); 3564 if (temp >= stcb->asoc.streamoutcnt) { 3565 /* no such stream */ 3566 continue; 3567 } 3568 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3569 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3570 } 3571 } else { 3572 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3573 stcb->asoc.strmout[i].next_mid_ordered = 0; 3574 stcb->asoc.strmout[i].next_mid_unordered = 0; 3575 } 3576 } 3577 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3578 } 3579 3580 static void 3581 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3582 { 3583 uint32_t i; 3584 uint16_t temp; 3585 3586 if (number_entries > 0) { 3587 for (i = 0; i < number_entries; i++) { 3588 temp = ntohs(list[i]); 3589 if (temp >= stcb->asoc.streamoutcnt) { 3590 /* no such stream */ 3591 continue; 3592 } 3593 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3594 } 3595 } else { 3596 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3597 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3598 } 3599 } 3600 } 3601 3602 3603 struct sctp_stream_reset_request * 3604 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3605 { 3606 struct sctp_association *asoc; 3607 struct sctp_chunkhdr *ch; 3608 struct sctp_stream_reset_request *r; 3609 struct sctp_tmit_chunk *chk; 3610 int len, clen; 3611 3612 asoc = &stcb->asoc; 3613 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3614 asoc->stream_reset_outstanding = 0; 3615 return (NULL); 3616 } 3617 if (stcb->asoc.str_reset == NULL) { 3618 asoc->stream_reset_outstanding = 0; 3619 return (NULL); 3620 } 3621 chk = stcb->asoc.str_reset; 3622 if (chk->data == NULL) { 3623 return (NULL); 3624 } 3625 if (bchk) { 3626 /* he wants a copy of the chk pointer */ 3627 *bchk = chk; 3628 } 3629 clen = chk->send_size; 3630 ch = mtod(chk->data, struct sctp_chunkhdr *); 3631 r = (struct sctp_stream_reset_request *)(ch + 1); 3632 if (ntohl(r->request_seq) == seq) { 3633 /* found it */ 3634 return (r); 3635 } 3636 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3637 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3638 /* move to the next one, there can only be a max of two */ 3639 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3640 if (ntohl(r->request_seq) == seq) { 3641 return (r); 3642 } 3643 } 3644 /* that seq is not here */ 3645 return (NULL); 3646 } 3647 3648 static void 3649 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3650 { 3651 struct sctp_association *asoc; 3652 struct sctp_tmit_chunk *chk; 3653 3654 asoc = &stcb->asoc; 3655 chk = asoc->str_reset; 3656 if (chk == NULL) { 3657 return; 3658 } 3659 asoc->str_reset = NULL; 3660 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3661 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3662 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3663 asoc->ctrl_queue_cnt--; 3664 if (chk->data) { 3665 sctp_m_freem(chk->data); 3666 chk->data = NULL; 3667 } 3668 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3669 } 3670 3671 3672 static int 3673 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3674 uint32_t seq, uint32_t action, 3675 struct sctp_stream_reset_response *respin) 3676 { 3677 uint16_t type; 3678 int lparam_len; 3679 struct sctp_association *asoc = &stcb->asoc; 3680 struct sctp_tmit_chunk *chk; 3681 struct sctp_stream_reset_request *req_param; 3682 struct sctp_stream_reset_out_request *req_out_param; 3683 struct sctp_stream_reset_in_request *req_in_param; 3684 uint32_t number_entries; 3685 3686 if (asoc->stream_reset_outstanding == 0) { 3687 /* duplicate */ 3688 return (0); 3689 } 3690 if (seq == stcb->asoc.str_reset_seq_out) { 3691 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3692 if (req_param != NULL) { 3693 stcb->asoc.str_reset_seq_out++; 3694 type = ntohs(req_param->ph.param_type); 3695 lparam_len = ntohs(req_param->ph.param_length); 3696 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3697 int no_clear = 0; 3698 3699 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3700 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3701 asoc->stream_reset_out_is_outstanding = 0; 3702 if (asoc->stream_reset_outstanding) 3703 asoc->stream_reset_outstanding--; 3704 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3705 /* do it */ 3706 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3707 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3708 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3709 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3710 /* 3711 * Set it up so we don't stop 3712 * retransmitting 3713 */ 3714 asoc->stream_reset_outstanding++; 3715 stcb->asoc.str_reset_seq_out--; 3716 asoc->stream_reset_out_is_outstanding = 1; 3717 no_clear = 1; 3718 } else { 3719 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3720 } 3721 if (no_clear == 0) { 3722 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3723 } 3724 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3725 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3726 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3727 if (asoc->stream_reset_outstanding) 3728 asoc->stream_reset_outstanding--; 3729 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3730 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3731 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3732 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3733 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3734 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3735 } 3736 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3737 /* Ok we now may have more streams */ 3738 int num_stream; 3739 3740 num_stream = stcb->asoc.strm_pending_add_size; 3741 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3742 /* TSNH */ 3743 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3744 } 3745 stcb->asoc.strm_pending_add_size = 0; 3746 if (asoc->stream_reset_outstanding) 3747 asoc->stream_reset_outstanding--; 3748 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3749 /* Put the new streams into effect */ 3750 int i; 3751 3752 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3753 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3754 } 3755 asoc->streamoutcnt += num_stream; 3756 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3757 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3758 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3759 SCTP_STREAM_CHANGE_DENIED); 3760 } else { 3761 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3762 SCTP_STREAM_CHANGE_FAILED); 3763 } 3764 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3765 if (asoc->stream_reset_outstanding) 3766 asoc->stream_reset_outstanding--; 3767 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3768 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3769 SCTP_STREAM_CHANGE_DENIED); 3770 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3771 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3772 SCTP_STREAM_CHANGE_FAILED); 3773 } 3774 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3775 /** 3776 * a) Adopt the new in tsn. 3777 * b) reset the map 3778 * c) Adopt the new out-tsn 3779 */ 3780 struct sctp_stream_reset_response_tsn *resp; 3781 struct sctp_forward_tsn_chunk fwdtsn; 3782 int abort_flag = 0; 3783 3784 if (respin == NULL) { 3785 /* huh ? */ 3786 return (0); 3787 } 3788 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3789 return (0); 3790 } 3791 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3792 resp = (struct sctp_stream_reset_response_tsn *)respin; 3793 asoc->stream_reset_outstanding--; 3794 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3795 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3796 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3797 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3798 if (abort_flag) { 3799 return (1); 3800 } 3801 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3802 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3803 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3804 } 3805 3806 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3807 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3808 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3809 3810 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3811 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3812 3813 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3814 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3815 3816 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3817 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3818 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3819 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3820 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3821 SCTP_ASSOC_RESET_DENIED); 3822 } else { 3823 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3824 SCTP_ASSOC_RESET_FAILED); 3825 } 3826 } 3827 /* get rid of the request and get the request flags */ 3828 if (asoc->stream_reset_outstanding == 0) { 3829 sctp_clean_up_stream_reset(stcb); 3830 } 3831 } 3832 } 3833 if (asoc->stream_reset_outstanding == 0) { 3834 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3835 } 3836 return (0); 3837 } 3838 3839 static void 3840 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3841 struct sctp_tmit_chunk *chk, 3842 struct sctp_stream_reset_in_request *req, int trunc) 3843 { 3844 uint32_t seq; 3845 int len, i; 3846 int number_entries; 3847 uint16_t temp; 3848 3849 /* 3850 * peer wants me to send a str-reset to him for my outgoing seq's if 3851 * seq_in is right. 3852 */ 3853 struct sctp_association *asoc = &stcb->asoc; 3854 3855 seq = ntohl(req->request_seq); 3856 if (asoc->str_reset_seq_in == seq) { 3857 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3858 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3859 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3860 } else if (trunc) { 3861 /* Can't do it, since they exceeded our buffer size */ 3862 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3863 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3864 len = ntohs(req->ph.param_length); 3865 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3866 if (number_entries) { 3867 for (i = 0; i < number_entries; i++) { 3868 temp = ntohs(req->list_of_streams[i]); 3869 if (temp >= stcb->asoc.streamoutcnt) { 3870 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3871 goto bad_boy; 3872 } 3873 req->list_of_streams[i] = temp; 3874 } 3875 for (i = 0; i < number_entries; i++) { 3876 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3877 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3878 } 3879 } 3880 } else { 3881 /* Its all */ 3882 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3883 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3884 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3885 } 3886 } 3887 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3888 } else { 3889 /* Can't do it, since we have sent one out */ 3890 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3891 } 3892 bad_boy: 3893 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3894 asoc->str_reset_seq_in++; 3895 } else if (asoc->str_reset_seq_in - 1 == seq) { 3896 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3897 } else if (asoc->str_reset_seq_in - 2 == seq) { 3898 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3899 } else { 3900 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3901 } 3902 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3903 } 3904 3905 static int 3906 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3907 struct sctp_tmit_chunk *chk, 3908 struct sctp_stream_reset_tsn_request *req) 3909 { 3910 /* reset all in and out and update the tsn */ 3911 /* 3912 * A) reset my str-seq's on in and out. B) Select a receive next, 3913 * and set cum-ack to it. Also process this selected number as a 3914 * fwd-tsn as well. C) set in the response my next sending seq. 3915 */ 3916 struct sctp_forward_tsn_chunk fwdtsn; 3917 struct sctp_association *asoc = &stcb->asoc; 3918 int abort_flag = 0; 3919 uint32_t seq; 3920 3921 seq = ntohl(req->request_seq); 3922 if (asoc->str_reset_seq_in == seq) { 3923 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3924 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3925 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3926 } else { 3927 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3928 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3929 fwdtsn.ch.chunk_flags = 0; 3930 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3931 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3932 if (abort_flag) { 3933 return (1); 3934 } 3935 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3936 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3937 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3938 } 3939 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3940 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3941 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3942 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3943 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3944 atomic_add_int(&asoc->sending_seq, 1); 3945 /* save off historical data for retrans */ 3946 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3947 asoc->last_sending_seq[0] = asoc->sending_seq; 3948 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3949 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3950 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3951 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3952 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3953 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3954 } 3955 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3956 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3957 asoc->str_reset_seq_in++; 3958 } else if (asoc->str_reset_seq_in - 1 == seq) { 3959 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3960 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3961 } else if (asoc->str_reset_seq_in - 2 == seq) { 3962 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3963 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3964 } else { 3965 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3966 } 3967 return (0); 3968 } 3969 3970 static void 3971 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3972 struct sctp_tmit_chunk *chk, 3973 struct sctp_stream_reset_out_request *req, int trunc) 3974 { 3975 uint32_t seq, tsn; 3976 int number_entries, len; 3977 struct sctp_association *asoc = &stcb->asoc; 3978 3979 seq = ntohl(req->request_seq); 3980 3981 /* now if its not a duplicate we process it */ 3982 if (asoc->str_reset_seq_in == seq) { 3983 len = ntohs(req->ph.param_length); 3984 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3985 /* 3986 * the sender is resetting, handle the list issue.. we must 3987 * a) verify if we can do the reset, if so no problem b) If 3988 * we can't do the reset we must copy the request. c) queue 3989 * it, and setup the data in processor to trigger it off 3990 * when needed and dequeue all the queued data. 3991 */ 3992 tsn = ntohl(req->send_reset_at_tsn); 3993 3994 /* move the reset action back one */ 3995 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3996 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3997 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3998 } else if (trunc) { 3999 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4000 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 4001 /* we can do it now */ 4002 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 4003 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4004 } else { 4005 /* 4006 * we must queue it up and thus wait for the TSN's 4007 * to arrive that are at or before tsn 4008 */ 4009 struct sctp_stream_reset_list *liste; 4010 int siz; 4011 4012 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4013 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4014 siz, SCTP_M_STRESET); 4015 if (liste == NULL) { 4016 /* gak out of memory */ 4017 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4018 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4019 return; 4020 } 4021 liste->seq = seq; 4022 liste->tsn = tsn; 4023 liste->number_entries = number_entries; 4024 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4025 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4026 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4027 } 4028 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4029 asoc->str_reset_seq_in++; 4030 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4031 /* 4032 * one seq back, just echo back last action since my 4033 * response was lost. 4034 */ 4035 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4036 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4037 /* 4038 * two seq back, just echo back last action since my 4039 * response was lost. 4040 */ 4041 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4042 } else { 4043 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4044 } 4045 } 4046 4047 static void 4048 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4049 struct sctp_stream_reset_add_strm *str_add) 4050 { 4051 /* 4052 * Peer is requesting to add more streams. If its within our 4053 * max-streams we will allow it. 4054 */ 4055 uint32_t num_stream, i; 4056 uint32_t seq; 4057 struct sctp_association *asoc = &stcb->asoc; 4058 struct sctp_queued_to_read *ctl, *nctl; 4059 4060 /* Get the number. */ 4061 seq = ntohl(str_add->request_seq); 4062 num_stream = ntohs(str_add->number_of_streams); 4063 /* Now what would be the new total? */ 4064 if (asoc->str_reset_seq_in == seq) { 4065 num_stream += stcb->asoc.streamincnt; 4066 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4067 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4068 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4069 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4070 (num_stream > 0xffff)) { 4071 /* We must reject it they ask for to many */ 4072 denied: 4073 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4074 } else { 4075 /* Ok, we can do that :-) */ 4076 struct sctp_stream_in *oldstrm; 4077 4078 /* save off the old */ 4079 oldstrm = stcb->asoc.strmin; 4080 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4081 (num_stream * sizeof(struct sctp_stream_in)), 4082 SCTP_M_STRMI); 4083 if (stcb->asoc.strmin == NULL) { 4084 stcb->asoc.strmin = oldstrm; 4085 goto denied; 4086 } 4087 /* copy off the old data */ 4088 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4089 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4090 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4091 stcb->asoc.strmin[i].sid = i; 4092 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4093 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4094 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4095 /* now anything on those queues? */ 4096 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4097 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4098 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4099 } 4100 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4101 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4102 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4103 } 4104 } 4105 /* Init the new streams */ 4106 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4107 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4108 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4109 stcb->asoc.strmin[i].sid = i; 4110 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4111 stcb->asoc.strmin[i].pd_api_started = 0; 4112 stcb->asoc.strmin[i].delivery_started = 0; 4113 } 4114 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4115 /* update the size */ 4116 stcb->asoc.streamincnt = num_stream; 4117 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4118 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4119 } 4120 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4121 asoc->str_reset_seq_in++; 4122 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4123 /* 4124 * one seq back, just echo back last action since my 4125 * response was lost. 4126 */ 4127 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4128 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4129 /* 4130 * two seq back, just echo back last action since my 4131 * response was lost. 4132 */ 4133 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4134 } else { 4135 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4136 4137 } 4138 } 4139 4140 static void 4141 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4142 struct sctp_stream_reset_add_strm *str_add) 4143 { 4144 /* 4145 * Peer is requesting to add more streams. If its within our 4146 * max-streams we will allow it. 4147 */ 4148 uint16_t num_stream; 4149 uint32_t seq; 4150 struct sctp_association *asoc = &stcb->asoc; 4151 4152 /* Get the number. */ 4153 seq = ntohl(str_add->request_seq); 4154 num_stream = ntohs(str_add->number_of_streams); 4155 /* Now what would be the new total? */ 4156 if (asoc->str_reset_seq_in == seq) { 4157 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4158 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4159 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4160 } else if (stcb->asoc.stream_reset_outstanding) { 4161 /* We must reject it we have something pending */ 4162 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4163 } else { 4164 /* Ok, we can do that :-) */ 4165 int mychk; 4166 4167 mychk = stcb->asoc.streamoutcnt; 4168 mychk += num_stream; 4169 if (mychk < 0x10000) { 4170 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4171 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4172 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4173 } 4174 } else { 4175 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4176 } 4177 } 4178 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4179 asoc->str_reset_seq_in++; 4180 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4181 /* 4182 * one seq back, just echo back last action since my 4183 * response was lost. 4184 */ 4185 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4186 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4187 /* 4188 * two seq back, just echo back last action since my 4189 * response was lost. 4190 */ 4191 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4192 } else { 4193 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4194 } 4195 } 4196 4197 #ifdef __GNUC__ 4198 __attribute__((noinline)) 4199 #endif 4200 static int 4201 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4202 struct sctp_chunkhdr *ch_req) 4203 { 4204 uint16_t remaining_length, param_len, ptype; 4205 struct sctp_paramhdr pstore; 4206 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4207 uint32_t seq = 0; 4208 int num_req = 0; 4209 int trunc = 0; 4210 struct sctp_tmit_chunk *chk; 4211 struct sctp_chunkhdr *ch; 4212 struct sctp_paramhdr *ph; 4213 int ret_code = 0; 4214 int num_param = 0; 4215 4216 /* now it may be a reset or a reset-response */ 4217 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4218 4219 /* setup for adding the response */ 4220 sctp_alloc_a_chunk(stcb, chk); 4221 if (chk == NULL) { 4222 return (ret_code); 4223 } 4224 chk->copy_by_ref = 0; 4225 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4226 chk->rec.chunk_id.can_take_data = 0; 4227 chk->flags = 0; 4228 chk->asoc = &stcb->asoc; 4229 chk->no_fr_allowed = 0; 4230 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4231 chk->book_size_scale = 0; 4232 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4233 if (chk->data == NULL) { 4234 strres_nochunk: 4235 if (chk->data) { 4236 sctp_m_freem(chk->data); 4237 chk->data = NULL; 4238 } 4239 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4240 return (ret_code); 4241 } 4242 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4243 4244 /* setup chunk parameters */ 4245 chk->sent = SCTP_DATAGRAM_UNSENT; 4246 chk->snd_count = 0; 4247 chk->whoTo = NULL; 4248 4249 ch = mtod(chk->data, struct sctp_chunkhdr *); 4250 ch->chunk_type = SCTP_STREAM_RESET; 4251 ch->chunk_flags = 0; 4252 ch->chunk_length = htons(chk->send_size); 4253 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4254 offset += sizeof(struct sctp_chunkhdr); 4255 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4256 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4257 if (ph == NULL) { 4258 /* TSNH */ 4259 break; 4260 } 4261 param_len = ntohs(ph->param_length); 4262 if ((param_len > remaining_length) || 4263 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4264 /* bad parameter length */ 4265 break; 4266 } 4267 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4268 (uint8_t *)&cstore); 4269 if (ph == NULL) { 4270 /* TSNH */ 4271 break; 4272 } 4273 ptype = ntohs(ph->param_type); 4274 num_param++; 4275 if (param_len > sizeof(cstore)) { 4276 trunc = 1; 4277 } else { 4278 trunc = 0; 4279 } 4280 if (num_param > SCTP_MAX_RESET_PARAMS) { 4281 /* hit the max of parameters already sorry.. */ 4282 break; 4283 } 4284 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4285 struct sctp_stream_reset_out_request *req_out; 4286 4287 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4288 break; 4289 } 4290 req_out = (struct sctp_stream_reset_out_request *)ph; 4291 num_req++; 4292 if (stcb->asoc.stream_reset_outstanding) { 4293 seq = ntohl(req_out->response_seq); 4294 if (seq == stcb->asoc.str_reset_seq_out) { 4295 /* implicit ack */ 4296 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4297 } 4298 } 4299 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4300 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4301 struct sctp_stream_reset_add_strm *str_add; 4302 4303 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4304 break; 4305 } 4306 str_add = (struct sctp_stream_reset_add_strm *)ph; 4307 num_req++; 4308 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4309 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4310 struct sctp_stream_reset_add_strm *str_add; 4311 4312 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4313 break; 4314 } 4315 str_add = (struct sctp_stream_reset_add_strm *)ph; 4316 num_req++; 4317 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4318 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4319 struct sctp_stream_reset_in_request *req_in; 4320 4321 num_req++; 4322 req_in = (struct sctp_stream_reset_in_request *)ph; 4323 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4324 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4325 struct sctp_stream_reset_tsn_request *req_tsn; 4326 4327 num_req++; 4328 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4329 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4330 ret_code = 1; 4331 goto strres_nochunk; 4332 } 4333 /* no more */ 4334 break; 4335 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4336 struct sctp_stream_reset_response *resp; 4337 uint32_t result; 4338 4339 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4340 break; 4341 } 4342 resp = (struct sctp_stream_reset_response *)ph; 4343 seq = ntohl(resp->response_seq); 4344 result = ntohl(resp->result); 4345 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4346 ret_code = 1; 4347 goto strres_nochunk; 4348 } 4349 } else { 4350 break; 4351 } 4352 offset += SCTP_SIZE32(param_len); 4353 if (remaining_length >= SCTP_SIZE32(param_len)) { 4354 remaining_length -= SCTP_SIZE32(param_len); 4355 } else { 4356 remaining_length = 0; 4357 } 4358 } 4359 if (num_req == 0) { 4360 /* we have no response free the stuff */ 4361 goto strres_nochunk; 4362 } 4363 /* ok we have a chunk to link in */ 4364 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4365 chk, 4366 sctp_next); 4367 stcb->asoc.ctrl_queue_cnt++; 4368 return (ret_code); 4369 } 4370 4371 /* 4372 * Handle a router or endpoints report of a packet loss, there are two ways 4373 * to handle this, either we get the whole packet and must disect it 4374 * ourselves (possibly with truncation and or corruption) or it is a summary 4375 * from a middle box that did the disectting for us. 4376 */ 4377 static void 4378 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4379 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4380 { 4381 uint32_t bottle_bw, on_queue; 4382 uint16_t trunc_len; 4383 unsigned int chlen; 4384 unsigned int at; 4385 struct sctp_chunk_desc desc; 4386 struct sctp_chunkhdr *ch; 4387 4388 chlen = ntohs(cp->ch.chunk_length); 4389 chlen -= sizeof(struct sctp_pktdrop_chunk); 4390 /* XXX possible chlen underflow */ 4391 if (chlen == 0) { 4392 ch = NULL; 4393 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4394 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4395 } else { 4396 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4397 chlen -= sizeof(struct sctphdr); 4398 /* XXX possible chlen underflow */ 4399 memset(&desc, 0, sizeof(desc)); 4400 } 4401 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4402 if (trunc_len > limit) { 4403 trunc_len = limit; 4404 } 4405 4406 /* now the chunks themselves */ 4407 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4408 desc.chunk_type = ch->chunk_type; 4409 /* get amount we need to move */ 4410 at = ntohs(ch->chunk_length); 4411 if (at < sizeof(struct sctp_chunkhdr)) { 4412 /* corrupt chunk, maybe at the end? */ 4413 SCTP_STAT_INCR(sctps_pdrpcrupt); 4414 break; 4415 } 4416 if (trunc_len == 0) { 4417 /* we are supposed to have all of it */ 4418 if (at > chlen) { 4419 /* corrupt skip it */ 4420 SCTP_STAT_INCR(sctps_pdrpcrupt); 4421 break; 4422 } 4423 } else { 4424 /* is there enough of it left ? */ 4425 if (desc.chunk_type == SCTP_DATA) { 4426 if (chlen < (sizeof(struct sctp_data_chunk) + 4427 sizeof(desc.data_bytes))) { 4428 break; 4429 } 4430 } else { 4431 if (chlen < sizeof(struct sctp_chunkhdr)) { 4432 break; 4433 } 4434 } 4435 } 4436 if (desc.chunk_type == SCTP_DATA) { 4437 /* can we get out the tsn? */ 4438 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4439 SCTP_STAT_INCR(sctps_pdrpmbda); 4440 4441 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4442 /* yep */ 4443 struct sctp_data_chunk *dcp; 4444 uint8_t *ddp; 4445 unsigned int iii; 4446 4447 dcp = (struct sctp_data_chunk *)ch; 4448 ddp = (uint8_t *)(dcp + 1); 4449 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4450 desc.data_bytes[iii] = ddp[iii]; 4451 } 4452 desc.tsn_ifany = dcp->dp.tsn; 4453 } else { 4454 /* nope we are done. */ 4455 SCTP_STAT_INCR(sctps_pdrpnedat); 4456 break; 4457 } 4458 } else { 4459 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4460 SCTP_STAT_INCR(sctps_pdrpmbct); 4461 } 4462 4463 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4464 SCTP_STAT_INCR(sctps_pdrppdbrk); 4465 break; 4466 } 4467 if (SCTP_SIZE32(at) > chlen) { 4468 break; 4469 } 4470 chlen -= SCTP_SIZE32(at); 4471 if (chlen < sizeof(struct sctp_chunkhdr)) { 4472 /* done, none left */ 4473 break; 4474 } 4475 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4476 } 4477 /* Now update any rwnd --- possibly */ 4478 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4479 /* From a peer, we get a rwnd report */ 4480 uint32_t a_rwnd; 4481 4482 SCTP_STAT_INCR(sctps_pdrpfehos); 4483 4484 bottle_bw = ntohl(cp->bottle_bw); 4485 on_queue = ntohl(cp->current_onq); 4486 if (bottle_bw && on_queue) { 4487 /* a rwnd report is in here */ 4488 if (bottle_bw > on_queue) 4489 a_rwnd = bottle_bw - on_queue; 4490 else 4491 a_rwnd = 0; 4492 4493 if (a_rwnd == 0) 4494 stcb->asoc.peers_rwnd = 0; 4495 else { 4496 if (a_rwnd > stcb->asoc.total_flight) { 4497 stcb->asoc.peers_rwnd = 4498 a_rwnd - stcb->asoc.total_flight; 4499 } else { 4500 stcb->asoc.peers_rwnd = 0; 4501 } 4502 if (stcb->asoc.peers_rwnd < 4503 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4504 /* SWS sender side engages */ 4505 stcb->asoc.peers_rwnd = 0; 4506 } 4507 } 4508 } 4509 } else { 4510 SCTP_STAT_INCR(sctps_pdrpfmbox); 4511 } 4512 4513 /* now middle boxes in sat networks get a cwnd bump */ 4514 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4515 (stcb->asoc.sat_t3_loss_recovery == 0) && 4516 (stcb->asoc.sat_network)) { 4517 /* 4518 * This is debatable but for sat networks it makes sense 4519 * Note if a T3 timer has went off, we will prohibit any 4520 * changes to cwnd until we exit the t3 loss recovery. 4521 */ 4522 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4523 net, cp, &bottle_bw, &on_queue); 4524 } 4525 } 4526 4527 /* 4528 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4529 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4530 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4531 * length of the complete packet outputs: - length: modified to remaining 4532 * length after control processing - netp: modified to new sctp_nets after 4533 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4534 * bad packet,...) otherwise return the tcb for this packet 4535 */ 4536 #ifdef __GNUC__ 4537 __attribute__((noinline)) 4538 #endif 4539 static struct sctp_tcb * 4540 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4541 struct sockaddr *src, struct sockaddr *dst, 4542 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4543 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4544 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4545 uint32_t vrf_id, uint16_t port) 4546 { 4547 struct sctp_association *asoc; 4548 struct mbuf *op_err; 4549 char msg[SCTP_DIAG_INFO_LEN]; 4550 uint32_t vtag_in; 4551 int num_chunks = 0; /* number of control chunks processed */ 4552 uint32_t chk_length, contiguous; 4553 int ret; 4554 int abort_no_unlock = 0; 4555 int ecne_seen = 0; 4556 4557 /* 4558 * How big should this be, and should it be alloc'd? Lets try the 4559 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4560 * until we get into jumbo grams and such.. 4561 */ 4562 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4563 int got_auth = 0; 4564 uint32_t auth_offset = 0, auth_len = 0; 4565 int auth_skipped = 0; 4566 int asconf_cnt = 0; 4567 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4568 struct socket *so; 4569 #endif 4570 4571 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4572 iphlen, *offset, length, (void *)stcb); 4573 4574 if (stcb) { 4575 SCTP_TCB_LOCK_ASSERT(stcb); 4576 } 4577 /* validate chunk header length... */ 4578 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4579 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4580 ntohs(ch->chunk_length)); 4581 *offset = length; 4582 return (stcb); 4583 } 4584 /* 4585 * validate the verification tag 4586 */ 4587 vtag_in = ntohl(sh->v_tag); 4588 4589 if (ch->chunk_type == SCTP_INITIATION) { 4590 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4591 ntohs(ch->chunk_length), vtag_in); 4592 if (vtag_in != 0) { 4593 /* protocol error- silently discard... */ 4594 SCTP_STAT_INCR(sctps_badvtag); 4595 if (stcb != NULL) { 4596 SCTP_TCB_UNLOCK(stcb); 4597 } 4598 return (NULL); 4599 } 4600 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4601 /* 4602 * If there is no stcb, skip the AUTH chunk and process 4603 * later after a stcb is found (to validate the lookup was 4604 * valid. 4605 */ 4606 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4607 (stcb == NULL) && 4608 (inp->auth_supported == 1)) { 4609 /* save this chunk for later processing */ 4610 auth_skipped = 1; 4611 auth_offset = *offset; 4612 auth_len = ntohs(ch->chunk_length); 4613 4614 /* (temporarily) move past this chunk */ 4615 *offset += SCTP_SIZE32(auth_len); 4616 if (*offset >= length) { 4617 /* no more data left in the mbuf chain */ 4618 *offset = length; 4619 return (NULL); 4620 } 4621 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4622 sizeof(struct sctp_chunkhdr), chunk_buf); 4623 } 4624 if (ch == NULL) { 4625 /* Help */ 4626 *offset = length; 4627 return (stcb); 4628 } 4629 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4630 goto process_control_chunks; 4631 } 4632 /* 4633 * first check if it's an ASCONF with an unknown src addr we 4634 * need to look inside to find the association 4635 */ 4636 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4637 struct sctp_chunkhdr *asconf_ch = ch; 4638 uint32_t asconf_offset = 0, asconf_len = 0; 4639 4640 /* inp's refcount may be reduced */ 4641 SCTP_INP_INCR_REF(inp); 4642 4643 asconf_offset = *offset; 4644 do { 4645 asconf_len = ntohs(asconf_ch->chunk_length); 4646 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4647 break; 4648 stcb = sctp_findassociation_ep_asconf(m, 4649 *offset, 4650 dst, 4651 sh, &inp, netp, vrf_id); 4652 if (stcb != NULL) 4653 break; 4654 asconf_offset += SCTP_SIZE32(asconf_len); 4655 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4656 sizeof(struct sctp_chunkhdr), chunk_buf); 4657 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4658 if (stcb == NULL) { 4659 /* 4660 * reduce inp's refcount if not reduced in 4661 * sctp_findassociation_ep_asconf(). 4662 */ 4663 SCTP_INP_DECR_REF(inp); 4664 } 4665 4666 /* now go back and verify any auth chunk to be sure */ 4667 if (auth_skipped && (stcb != NULL)) { 4668 struct sctp_auth_chunk *auth; 4669 4670 auth = (struct sctp_auth_chunk *) 4671 sctp_m_getptr(m, auth_offset, 4672 auth_len, chunk_buf); 4673 got_auth = 1; 4674 auth_skipped = 0; 4675 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4676 auth_offset)) { 4677 /* auth HMAC failed so dump it */ 4678 *offset = length; 4679 return (stcb); 4680 } else { 4681 /* remaining chunks are HMAC checked */ 4682 stcb->asoc.authenticated = 1; 4683 } 4684 } 4685 } 4686 if (stcb == NULL) { 4687 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4688 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4689 msg); 4690 /* no association, so it's out of the blue... */ 4691 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4692 mflowtype, mflowid, inp->fibnum, 4693 vrf_id, port); 4694 *offset = length; 4695 return (NULL); 4696 } 4697 asoc = &stcb->asoc; 4698 /* ABORT and SHUTDOWN can use either v_tag... */ 4699 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4700 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4701 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4702 /* Take the T-bit always into account. */ 4703 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4704 (vtag_in == asoc->my_vtag)) || 4705 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4706 (asoc->peer_vtag != htonl(0)) && 4707 (vtag_in == asoc->peer_vtag))) { 4708 /* this is valid */ 4709 } else { 4710 /* drop this packet... */ 4711 SCTP_STAT_INCR(sctps_badvtag); 4712 if (stcb != NULL) { 4713 SCTP_TCB_UNLOCK(stcb); 4714 } 4715 return (NULL); 4716 } 4717 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4718 if (vtag_in != asoc->my_vtag) { 4719 /* 4720 * this could be a stale SHUTDOWN-ACK or the 4721 * peer never got the SHUTDOWN-COMPLETE and 4722 * is still hung; we have started a new asoc 4723 * but it won't complete until the shutdown 4724 * is completed 4725 */ 4726 if (stcb != NULL) { 4727 SCTP_TCB_UNLOCK(stcb); 4728 } 4729 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4730 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4731 msg); 4732 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4733 sh, inp, op_err, 4734 mflowtype, mflowid, fibnum, 4735 vrf_id, port); 4736 return (NULL); 4737 } 4738 } else { 4739 /* for all other chunks, vtag must match */ 4740 if (vtag_in != asoc->my_vtag) { 4741 /* invalid vtag... */ 4742 SCTPDBG(SCTP_DEBUG_INPUT3, 4743 "invalid vtag: %xh, expect %xh\n", 4744 vtag_in, asoc->my_vtag); 4745 SCTP_STAT_INCR(sctps_badvtag); 4746 if (stcb != NULL) { 4747 SCTP_TCB_UNLOCK(stcb); 4748 } 4749 *offset = length; 4750 return (NULL); 4751 } 4752 } 4753 } /* end if !SCTP_COOKIE_ECHO */ 4754 /* 4755 * process all control chunks... 4756 */ 4757 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4758 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4759 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4760 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4761 /* implied cookie-ack.. we must have lost the ack */ 4762 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4763 *netp); 4764 } 4765 4766 process_control_chunks: 4767 while (IS_SCTP_CONTROL(ch)) { 4768 /* validate chunk length */ 4769 chk_length = ntohs(ch->chunk_length); 4770 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4771 ch->chunk_type, chk_length); 4772 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4773 if (chk_length < sizeof(*ch) || 4774 (*offset + (int)chk_length) > length) { 4775 *offset = length; 4776 return (stcb); 4777 } 4778 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4779 /* 4780 * INIT and INIT-ACK only gets the init ack "header" portion 4781 * only because we don't have to process the peer's COOKIE. 4782 * All others get a complete chunk. 4783 */ 4784 switch (ch->chunk_type) { 4785 case SCTP_INITIATION: 4786 contiguous = sizeof(struct sctp_init_chunk); 4787 break; 4788 case SCTP_INITIATION_ACK: 4789 contiguous = sizeof(struct sctp_init_ack_chunk); 4790 break; 4791 default: 4792 contiguous = min(chk_length, sizeof(chunk_buf)); 4793 break; 4794 } 4795 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4796 contiguous, 4797 chunk_buf); 4798 if (ch == NULL) { 4799 *offset = length; 4800 if (stcb != NULL) { 4801 SCTP_TCB_UNLOCK(stcb); 4802 } 4803 return (NULL); 4804 } 4805 4806 num_chunks++; 4807 /* Save off the last place we got a control from */ 4808 if (stcb != NULL) { 4809 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4810 /* 4811 * allow last_control to be NULL if 4812 * ASCONF... ASCONF processing will find the 4813 * right net later 4814 */ 4815 if ((netp != NULL) && (*netp != NULL)) 4816 stcb->asoc.last_control_chunk_from = *netp; 4817 } 4818 } 4819 #ifdef SCTP_AUDITING_ENABLED 4820 sctp_audit_log(0xB0, ch->chunk_type); 4821 #endif 4822 4823 /* check to see if this chunk required auth, but isn't */ 4824 if ((stcb != NULL) && 4825 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4826 !stcb->asoc.authenticated) { 4827 /* "silently" ignore */ 4828 SCTP_STAT_INCR(sctps_recvauthmissing); 4829 goto next_chunk; 4830 } 4831 switch (ch->chunk_type) { 4832 case SCTP_INITIATION: 4833 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4834 /* The INIT chunk must be the only chunk. */ 4835 if ((num_chunks > 1) || 4836 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4837 /* RFC 4960 requires that no ABORT is sent */ 4838 *offset = length; 4839 if (stcb != NULL) { 4840 SCTP_TCB_UNLOCK(stcb); 4841 } 4842 return (NULL); 4843 } 4844 /* Honor our resource limit. */ 4845 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4846 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4847 sctp_abort_association(inp, stcb, m, iphlen, 4848 src, dst, sh, op_err, 4849 mflowtype, mflowid, 4850 vrf_id, port); 4851 *offset = length; 4852 return (NULL); 4853 } 4854 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4855 (struct sctp_init_chunk *)ch, inp, 4856 stcb, *netp, &abort_no_unlock, 4857 mflowtype, mflowid, 4858 vrf_id, port); 4859 *offset = length; 4860 if ((!abort_no_unlock) && (stcb != NULL)) { 4861 SCTP_TCB_UNLOCK(stcb); 4862 } 4863 return (NULL); 4864 break; 4865 case SCTP_PAD_CHUNK: 4866 break; 4867 case SCTP_INITIATION_ACK: 4868 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4869 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4870 /* We are not interested anymore */ 4871 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4872 ; 4873 } else { 4874 *offset = length; 4875 if (stcb != NULL) { 4876 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4877 so = SCTP_INP_SO(inp); 4878 atomic_add_int(&stcb->asoc.refcnt, 1); 4879 SCTP_TCB_UNLOCK(stcb); 4880 SCTP_SOCKET_LOCK(so, 1); 4881 SCTP_TCB_LOCK(stcb); 4882 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4883 #endif 4884 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4885 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4886 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4887 SCTP_SOCKET_UNLOCK(so, 1); 4888 #endif 4889 } 4890 return (NULL); 4891 } 4892 } 4893 /* The INIT-ACK chunk must be the only chunk. */ 4894 if ((num_chunks > 1) || 4895 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4896 *offset = length; 4897 return (stcb); 4898 } 4899 if ((netp != NULL) && (*netp != NULL)) { 4900 ret = sctp_handle_init_ack(m, iphlen, *offset, 4901 src, dst, sh, 4902 (struct sctp_init_ack_chunk *)ch, 4903 stcb, *netp, 4904 &abort_no_unlock, 4905 mflowtype, mflowid, 4906 vrf_id); 4907 } else { 4908 ret = -1; 4909 } 4910 *offset = length; 4911 if (abort_no_unlock) { 4912 return (NULL); 4913 } 4914 /* 4915 * Special case, I must call the output routine to 4916 * get the cookie echoed 4917 */ 4918 if ((stcb != NULL) && (ret == 0)) { 4919 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4920 } 4921 return (stcb); 4922 break; 4923 case SCTP_SELECTIVE_ACK: 4924 case SCTP_NR_SELECTIVE_ACK: 4925 { 4926 int abort_now = 0; 4927 uint32_t a_rwnd, cum_ack; 4928 uint16_t num_seg, num_nr_seg, num_dup; 4929 uint8_t flags; 4930 int offset_seg, offset_dup; 4931 4932 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4933 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4934 SCTP_STAT_INCR(sctps_recvsacks); 4935 if (stcb == NULL) { 4936 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4937 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4938 break; 4939 } 4940 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4941 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4942 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4943 break; 4944 } 4945 } else { 4946 if (stcb->asoc.nrsack_supported == 0) { 4947 goto unknown_chunk; 4948 } 4949 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4950 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4951 break; 4952 } 4953 } 4954 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4955 /*- 4956 * If we have sent a shutdown-ack, we will pay no 4957 * attention to a sack sent in to us since 4958 * we don't care anymore. 4959 */ 4960 break; 4961 } 4962 flags = ch->chunk_flags; 4963 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4964 struct sctp_sack_chunk *sack; 4965 4966 sack = (struct sctp_sack_chunk *)ch; 4967 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4968 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4969 num_nr_seg = 0; 4970 num_dup = ntohs(sack->sack.num_dup_tsns); 4971 a_rwnd = ntohl(sack->sack.a_rwnd); 4972 if (sizeof(struct sctp_sack_chunk) + 4973 num_seg * sizeof(struct sctp_gap_ack_block) + 4974 num_dup * sizeof(uint32_t) != chk_length) { 4975 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4976 break; 4977 } 4978 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4979 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4980 } else { 4981 struct sctp_nr_sack_chunk *nr_sack; 4982 4983 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4984 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4985 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4986 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4987 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4988 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4989 if (sizeof(struct sctp_nr_sack_chunk) + 4990 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4991 num_dup * sizeof(uint32_t) != chk_length) { 4992 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4993 break; 4994 } 4995 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4996 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4997 } 4998 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4999 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 5000 cum_ack, num_seg, a_rwnd); 5001 stcb->asoc.seen_a_sack_this_pkt = 1; 5002 if ((stcb->asoc.pr_sctp_cnt == 0) && 5003 (num_seg == 0) && (num_nr_seg == 0) && 5004 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5005 (stcb->asoc.saw_sack_with_frags == 0) && 5006 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5007 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5008 /* 5009 * We have a SIMPLE sack having no 5010 * prior segments and data on sent 5011 * queue to be acked. Use the faster 5012 * path sack processing. We also 5013 * allow window update sacks with no 5014 * missing segments to go this way 5015 * too. 5016 */ 5017 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5018 &abort_now, ecne_seen); 5019 } else { 5020 if ((netp != NULL) && (*netp != NULL)) { 5021 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5022 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5023 cum_ack, a_rwnd, ecne_seen); 5024 } 5025 } 5026 if (abort_now) { 5027 /* ABORT signal from sack processing */ 5028 *offset = length; 5029 return (NULL); 5030 } 5031 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5032 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5033 (stcb->asoc.stream_queue_cnt == 0)) { 5034 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5035 } 5036 break; 5037 } 5038 case SCTP_HEARTBEAT_REQUEST: 5039 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5040 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5041 SCTP_STAT_INCR(sctps_recvheartbeat); 5042 sctp_send_heartbeat_ack(stcb, m, *offset, 5043 chk_length, *netp); 5044 } 5045 break; 5046 case SCTP_HEARTBEAT_ACK: 5047 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5048 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5049 /* Its not ours */ 5050 *offset = length; 5051 return (stcb); 5052 } 5053 SCTP_STAT_INCR(sctps_recvheartbeatack); 5054 if ((netp != NULL) && (*netp != NULL)) { 5055 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5056 stcb, *netp); 5057 } 5058 break; 5059 case SCTP_ABORT_ASSOCIATION: 5060 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5061 (void *)stcb); 5062 *offset = length; 5063 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5064 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5065 return (NULL); 5066 } else { 5067 return (stcb); 5068 } 5069 } else { 5070 return (NULL); 5071 } 5072 break; 5073 case SCTP_SHUTDOWN: 5074 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5075 (void *)stcb); 5076 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5077 *offset = length; 5078 return (stcb); 5079 } 5080 if ((netp != NULL) && (*netp != NULL)) { 5081 int abort_flag = 0; 5082 5083 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5084 stcb, *netp, &abort_flag); 5085 if (abort_flag) { 5086 *offset = length; 5087 return (NULL); 5088 } 5089 } 5090 break; 5091 case SCTP_SHUTDOWN_ACK: 5092 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5093 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5094 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5095 } 5096 *offset = length; 5097 return (NULL); 5098 break; 5099 case SCTP_OPERATION_ERROR: 5100 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5101 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5102 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5103 *offset = length; 5104 return (NULL); 5105 } 5106 break; 5107 case SCTP_COOKIE_ECHO: 5108 SCTPDBG(SCTP_DEBUG_INPUT3, 5109 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5110 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5111 ; 5112 } else { 5113 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5114 /* We are not interested anymore */ 5115 abend: 5116 if (stcb != NULL) { 5117 SCTP_TCB_UNLOCK(stcb); 5118 } 5119 *offset = length; 5120 return (NULL); 5121 } 5122 } 5123 /*- 5124 * First are we accepting? We do this again here 5125 * since it is possible that a previous endpoint WAS 5126 * listening responded to a INIT-ACK and then 5127 * closed. We opened and bound.. and are now no 5128 * longer listening. 5129 * 5130 * XXXGL: notes on checking listen queue length. 5131 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5132 * SOLISTENING(), because a listening "UDP type" 5133 * socket isn't listening in terms of the socket 5134 * layer. It is a normal data flow socket, that 5135 * can fork off new connections. Thus, we should 5136 * look into sol_qlen only in case we are !UDP. 5137 * 2) Checking sol_qlen in general requires locking 5138 * the socket, and this code lacks that. 5139 */ 5140 if ((stcb == NULL) && 5141 (!SCTP_IS_LISTENING(inp) || 5142 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5143 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5144 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5145 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5146 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5147 sctp_abort_association(inp, stcb, m, iphlen, 5148 src, dst, sh, op_err, 5149 mflowtype, mflowid, 5150 vrf_id, port); 5151 } 5152 *offset = length; 5153 return (NULL); 5154 } else { 5155 struct mbuf *ret_buf; 5156 struct sctp_inpcb *linp; 5157 5158 if (stcb) { 5159 linp = NULL; 5160 } else { 5161 linp = inp; 5162 } 5163 5164 if (linp != NULL) { 5165 SCTP_ASOC_CREATE_LOCK(linp); 5166 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5167 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5168 SCTP_ASOC_CREATE_UNLOCK(linp); 5169 goto abend; 5170 } 5171 } 5172 5173 if (netp != NULL) { 5174 struct sctp_tcb *locked_stcb; 5175 5176 locked_stcb = stcb; 5177 ret_buf = 5178 sctp_handle_cookie_echo(m, iphlen, 5179 *offset, 5180 src, dst, 5181 sh, 5182 (struct sctp_cookie_echo_chunk *)ch, 5183 &inp, &stcb, netp, 5184 auth_skipped, 5185 auth_offset, 5186 auth_len, 5187 &locked_stcb, 5188 mflowtype, 5189 mflowid, 5190 vrf_id, 5191 port); 5192 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5193 SCTP_TCB_UNLOCK(locked_stcb); 5194 } 5195 if (stcb != NULL) { 5196 SCTP_TCB_LOCK_ASSERT(stcb); 5197 } 5198 } else { 5199 ret_buf = NULL; 5200 } 5201 if (linp != NULL) { 5202 SCTP_ASOC_CREATE_UNLOCK(linp); 5203 } 5204 if (ret_buf == NULL) { 5205 if (stcb != NULL) { 5206 SCTP_TCB_UNLOCK(stcb); 5207 } 5208 SCTPDBG(SCTP_DEBUG_INPUT3, 5209 "GAK, null buffer\n"); 5210 *offset = length; 5211 return (NULL); 5212 } 5213 /* if AUTH skipped, see if it verified... */ 5214 if (auth_skipped) { 5215 got_auth = 1; 5216 auth_skipped = 0; 5217 } 5218 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5219 /* 5220 * Restart the timer if we have 5221 * pending data 5222 */ 5223 struct sctp_tmit_chunk *chk; 5224 5225 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5226 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5227 } 5228 } 5229 break; 5230 case SCTP_COOKIE_ACK: 5231 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5232 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5233 return (stcb); 5234 } 5235 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5236 /* We are not interested anymore */ 5237 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5238 ; 5239 } else if (stcb) { 5240 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5241 so = SCTP_INP_SO(inp); 5242 atomic_add_int(&stcb->asoc.refcnt, 1); 5243 SCTP_TCB_UNLOCK(stcb); 5244 SCTP_SOCKET_LOCK(so, 1); 5245 SCTP_TCB_LOCK(stcb); 5246 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5247 #endif 5248 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5249 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5251 SCTP_SOCKET_UNLOCK(so, 1); 5252 #endif 5253 *offset = length; 5254 return (NULL); 5255 } 5256 } 5257 if ((netp != NULL) && (*netp != NULL)) { 5258 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5259 } 5260 break; 5261 case SCTP_ECN_ECHO: 5262 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5263 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5264 /* Its not ours */ 5265 *offset = length; 5266 return (stcb); 5267 } 5268 if (stcb->asoc.ecn_supported == 0) { 5269 goto unknown_chunk; 5270 } 5271 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5272 ecne_seen = 1; 5273 break; 5274 case SCTP_ECN_CWR: 5275 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5276 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5277 *offset = length; 5278 return (stcb); 5279 } 5280 if (stcb->asoc.ecn_supported == 0) { 5281 goto unknown_chunk; 5282 } 5283 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5284 break; 5285 case SCTP_SHUTDOWN_COMPLETE: 5286 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5287 /* must be first and only chunk */ 5288 if ((num_chunks > 1) || 5289 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5290 *offset = length; 5291 return (stcb); 5292 } 5293 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5294 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5295 stcb, *netp); 5296 } 5297 *offset = length; 5298 return (NULL); 5299 break; 5300 case SCTP_ASCONF: 5301 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5302 if (stcb != NULL) { 5303 if (stcb->asoc.asconf_supported == 0) { 5304 goto unknown_chunk; 5305 } 5306 sctp_handle_asconf(m, *offset, src, 5307 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5308 asconf_cnt++; 5309 } 5310 break; 5311 case SCTP_ASCONF_ACK: 5312 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5313 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5314 /* Its not ours */ 5315 *offset = length; 5316 return (stcb); 5317 } 5318 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5319 if (stcb->asoc.asconf_supported == 0) { 5320 goto unknown_chunk; 5321 } 5322 /* He's alive so give him credit */ 5323 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5324 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5325 stcb->asoc.overall_error_count, 5326 0, 5327 SCTP_FROM_SCTP_INPUT, 5328 __LINE__); 5329 } 5330 stcb->asoc.overall_error_count = 0; 5331 sctp_handle_asconf_ack(m, *offset, 5332 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5333 if (abort_no_unlock) 5334 return (NULL); 5335 } 5336 break; 5337 case SCTP_FORWARD_CUM_TSN: 5338 case SCTP_IFORWARD_CUM_TSN: 5339 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5340 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5341 /* Its not ours */ 5342 *offset = length; 5343 return (stcb); 5344 } 5345 5346 if (stcb != NULL) { 5347 int abort_flag = 0; 5348 5349 if (stcb->asoc.prsctp_supported == 0) { 5350 goto unknown_chunk; 5351 } 5352 *fwd_tsn_seen = 1; 5353 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5354 /* We are not interested anymore */ 5355 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5356 so = SCTP_INP_SO(inp); 5357 atomic_add_int(&stcb->asoc.refcnt, 1); 5358 SCTP_TCB_UNLOCK(stcb); 5359 SCTP_SOCKET_LOCK(so, 1); 5360 SCTP_TCB_LOCK(stcb); 5361 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5362 #endif 5363 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5364 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5365 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5366 SCTP_SOCKET_UNLOCK(so, 1); 5367 #endif 5368 *offset = length; 5369 return (NULL); 5370 } 5371 /* 5372 * For sending a SACK this looks like DATA 5373 * chunks. 5374 */ 5375 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5376 sctp_handle_forward_tsn(stcb, 5377 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5378 if (abort_flag) { 5379 *offset = length; 5380 return (NULL); 5381 } 5382 } 5383 break; 5384 case SCTP_STREAM_RESET: 5385 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5386 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5387 /* Its not ours */ 5388 *offset = length; 5389 return (stcb); 5390 } 5391 if (stcb->asoc.reconfig_supported == 0) { 5392 goto unknown_chunk; 5393 } 5394 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5395 /* stop processing */ 5396 *offset = length; 5397 return (NULL); 5398 } 5399 break; 5400 case SCTP_PACKET_DROPPED: 5401 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5402 /* re-get it all please */ 5403 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5404 /* Its not ours */ 5405 *offset = length; 5406 return (stcb); 5407 } 5408 5409 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5410 if (stcb->asoc.pktdrop_supported == 0) { 5411 goto unknown_chunk; 5412 } 5413 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5414 stcb, *netp, 5415 min(chk_length, contiguous)); 5416 } 5417 break; 5418 case SCTP_AUTHENTICATION: 5419 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5420 if (stcb == NULL) { 5421 /* save the first AUTH for later processing */ 5422 if (auth_skipped == 0) { 5423 auth_offset = *offset; 5424 auth_len = chk_length; 5425 auth_skipped = 1; 5426 } 5427 /* skip this chunk (temporarily) */ 5428 goto next_chunk; 5429 } 5430 if (stcb->asoc.auth_supported == 0) { 5431 goto unknown_chunk; 5432 } 5433 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5434 (chk_length > (sizeof(struct sctp_auth_chunk) + 5435 SCTP_AUTH_DIGEST_LEN_MAX))) { 5436 /* Its not ours */ 5437 *offset = length; 5438 return (stcb); 5439 } 5440 if (got_auth == 1) { 5441 /* skip this chunk... it's already auth'd */ 5442 goto next_chunk; 5443 } 5444 got_auth = 1; 5445 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5446 m, *offset)) { 5447 /* auth HMAC failed so dump the packet */ 5448 *offset = length; 5449 return (stcb); 5450 } else { 5451 /* remaining chunks are HMAC checked */ 5452 stcb->asoc.authenticated = 1; 5453 } 5454 break; 5455 5456 default: 5457 unknown_chunk: 5458 /* it's an unknown chunk! */ 5459 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5460 struct sctp_gen_error_cause *cause; 5461 int len; 5462 5463 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5464 0, M_NOWAIT, 1, MT_DATA); 5465 if (op_err != NULL) { 5466 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5467 cause = mtod(op_err, struct sctp_gen_error_cause *); 5468 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5469 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5470 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5471 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5472 if (SCTP_BUF_NEXT(op_err) != NULL) { 5473 #ifdef SCTP_MBUF_LOGGING 5474 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5475 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5476 } 5477 #endif 5478 sctp_queue_op_err(stcb, op_err); 5479 } else { 5480 sctp_m_freem(op_err); 5481 } 5482 } 5483 } 5484 if ((ch->chunk_type & 0x80) == 0) { 5485 /* discard this packet */ 5486 *offset = length; 5487 return (stcb); 5488 } /* else skip this bad chunk and continue... */ 5489 break; 5490 } /* switch (ch->chunk_type) */ 5491 5492 5493 next_chunk: 5494 /* get the next chunk */ 5495 *offset += SCTP_SIZE32(chk_length); 5496 if (*offset >= length) { 5497 /* no more data left in the mbuf chain */ 5498 break; 5499 } 5500 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5501 sizeof(struct sctp_chunkhdr), chunk_buf); 5502 if (ch == NULL) { 5503 *offset = length; 5504 return (stcb); 5505 } 5506 } /* while */ 5507 5508 if ((asconf_cnt > 0) && (stcb != NULL)) { 5509 sctp_send_asconf_ack(stcb); 5510 } 5511 return (stcb); 5512 } 5513 5514 5515 /* 5516 * common input chunk processing (v4 and v6) 5517 */ 5518 void 5519 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5520 struct sockaddr *src, struct sockaddr *dst, 5521 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5522 uint8_t compute_crc, 5523 uint8_t ecn_bits, 5524 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5525 uint32_t vrf_id, uint16_t port) 5526 { 5527 uint32_t high_tsn; 5528 int fwd_tsn_seen = 0, data_processed = 0; 5529 struct mbuf *m = *mm, *op_err; 5530 char msg[SCTP_DIAG_INFO_LEN]; 5531 int un_sent; 5532 int cnt_ctrl_ready = 0; 5533 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5534 struct sctp_tcb *stcb = NULL; 5535 struct sctp_nets *net = NULL; 5536 5537 SCTP_STAT_INCR(sctps_recvdatagrams); 5538 #ifdef SCTP_AUDITING_ENABLED 5539 sctp_audit_log(0xE0, 1); 5540 sctp_auditing(0, inp, stcb, net); 5541 #endif 5542 if (compute_crc != 0) { 5543 uint32_t check, calc_check; 5544 5545 check = sh->checksum; 5546 sh->checksum = 0; 5547 calc_check = sctp_calculate_cksum(m, iphlen); 5548 sh->checksum = check; 5549 if (calc_check != check) { 5550 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5551 calc_check, check, (void *)m, length, iphlen); 5552 stcb = sctp_findassociation_addr(m, offset, src, dst, 5553 sh, ch, &inp, &net, vrf_id); 5554 #if defined(INET) || defined(INET6) 5555 if ((ch->chunk_type != SCTP_INITIATION) && 5556 (net != NULL) && (net->port != port)) { 5557 if (net->port == 0) { 5558 /* UDP encapsulation turned on. */ 5559 net->mtu -= sizeof(struct udphdr); 5560 if (stcb->asoc.smallest_mtu > net->mtu) { 5561 sctp_pathmtu_adjustment(stcb, net->mtu); 5562 } 5563 } else if (port == 0) { 5564 /* UDP encapsulation turned off. */ 5565 net->mtu += sizeof(struct udphdr); 5566 /* XXX Update smallest_mtu */ 5567 } 5568 net->port = port; 5569 } 5570 #endif 5571 if (net != NULL) { 5572 net->flowtype = mflowtype; 5573 net->flowid = mflowid; 5574 } 5575 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5576 if ((inp != NULL) && (stcb != NULL)) { 5577 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5578 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5579 } else if ((inp != NULL) && (stcb == NULL)) { 5580 inp_decr = inp; 5581 } 5582 SCTP_STAT_INCR(sctps_badsum); 5583 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5584 goto out; 5585 } 5586 } 5587 /* Destination port of 0 is illegal, based on RFC4960. */ 5588 if (sh->dest_port == 0) { 5589 SCTP_STAT_INCR(sctps_hdrops); 5590 goto out; 5591 } 5592 stcb = sctp_findassociation_addr(m, offset, src, dst, 5593 sh, ch, &inp, &net, vrf_id); 5594 #if defined(INET) || defined(INET6) 5595 if ((ch->chunk_type != SCTP_INITIATION) && 5596 (net != NULL) && (net->port != port)) { 5597 if (net->port == 0) { 5598 /* UDP encapsulation turned on. */ 5599 net->mtu -= sizeof(struct udphdr); 5600 if (stcb->asoc.smallest_mtu > net->mtu) { 5601 sctp_pathmtu_adjustment(stcb, net->mtu); 5602 } 5603 } else if (port == 0) { 5604 /* UDP encapsulation turned off. */ 5605 net->mtu += sizeof(struct udphdr); 5606 /* XXX Update smallest_mtu */ 5607 } 5608 net->port = port; 5609 } 5610 #endif 5611 if (net != NULL) { 5612 net->flowtype = mflowtype; 5613 net->flowid = mflowid; 5614 } 5615 if (inp == NULL) { 5616 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5617 SCTP_STAT_INCR(sctps_noport); 5618 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5619 goto out; 5620 } 5621 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5622 sctp_send_shutdown_complete2(src, dst, sh, 5623 mflowtype, mflowid, fibnum, 5624 vrf_id, port); 5625 goto out; 5626 } 5627 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5628 goto out; 5629 } 5630 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5631 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5632 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5633 (ch->chunk_type != SCTP_INIT))) { 5634 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5635 "Out of the blue"); 5636 sctp_send_abort(m, iphlen, src, dst, 5637 sh, 0, op_err, 5638 mflowtype, mflowid, fibnum, 5639 vrf_id, port); 5640 } 5641 } 5642 goto out; 5643 } else if (stcb == NULL) { 5644 inp_decr = inp; 5645 } 5646 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5647 (void *)m, iphlen, offset, length, (void *)stcb); 5648 if (stcb) { 5649 /* always clear this before beginning a packet */ 5650 stcb->asoc.authenticated = 0; 5651 stcb->asoc.seen_a_sack_this_pkt = 0; 5652 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5653 (void *)stcb, stcb->asoc.state); 5654 5655 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5656 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5657 /*- 5658 * If we hit here, we had a ref count 5659 * up when the assoc was aborted and the 5660 * timer is clearing out the assoc, we should 5661 * NOT respond to any packet.. its OOTB. 5662 */ 5663 SCTP_TCB_UNLOCK(stcb); 5664 stcb = NULL; 5665 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5666 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5667 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5668 msg); 5669 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5670 mflowtype, mflowid, inp->fibnum, 5671 vrf_id, port); 5672 goto out; 5673 } 5674 } 5675 if (IS_SCTP_CONTROL(ch)) { 5676 /* process the control portion of the SCTP packet */ 5677 /* sa_ignore NO_NULL_CHK */ 5678 stcb = sctp_process_control(m, iphlen, &offset, length, 5679 src, dst, sh, ch, 5680 inp, stcb, &net, &fwd_tsn_seen, 5681 mflowtype, mflowid, fibnum, 5682 vrf_id, port); 5683 if (stcb) { 5684 /* 5685 * This covers us if the cookie-echo was there and 5686 * it changes our INP. 5687 */ 5688 inp = stcb->sctp_ep; 5689 #if defined(INET) || defined(INET6) 5690 if ((ch->chunk_type != SCTP_INITIATION) && 5691 (net != NULL) && (net->port != port)) { 5692 if (net->port == 0) { 5693 /* UDP encapsulation turned on. */ 5694 net->mtu -= sizeof(struct udphdr); 5695 if (stcb->asoc.smallest_mtu > net->mtu) { 5696 sctp_pathmtu_adjustment(stcb, net->mtu); 5697 } 5698 } else if (port == 0) { 5699 /* UDP encapsulation turned off. */ 5700 net->mtu += sizeof(struct udphdr); 5701 /* XXX Update smallest_mtu */ 5702 } 5703 net->port = port; 5704 } 5705 #endif 5706 } 5707 } else { 5708 /* 5709 * no control chunks, so pre-process DATA chunks (these 5710 * checks are taken care of by control processing) 5711 */ 5712 5713 /* 5714 * if DATA only packet, and auth is required, then punt... 5715 * can't have authenticated without any AUTH (control) 5716 * chunks 5717 */ 5718 if ((stcb != NULL) && 5719 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5720 /* "silently" ignore */ 5721 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5722 SCTP_STAT_INCR(sctps_recvauthmissing); 5723 goto out; 5724 } 5725 if (stcb == NULL) { 5726 /* out of the blue DATA chunk */ 5727 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5728 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5729 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5730 msg); 5731 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5732 mflowtype, mflowid, fibnum, 5733 vrf_id, port); 5734 goto out; 5735 } 5736 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5737 /* v_tag mismatch! */ 5738 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5739 SCTP_STAT_INCR(sctps_badvtag); 5740 goto out; 5741 } 5742 } 5743 5744 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5745 if (stcb == NULL) { 5746 /* 5747 * no valid TCB for this packet, or we found it's a bad 5748 * packet while processing control, or we're done with this 5749 * packet (done or skip rest of data), so we drop it... 5750 */ 5751 goto out; 5752 } 5753 5754 /* 5755 * DATA chunk processing 5756 */ 5757 /* plow through the data chunks while length > offset */ 5758 5759 /* 5760 * Rest should be DATA only. Check authentication state if AUTH for 5761 * DATA is required. 5762 */ 5763 if ((length > offset) && 5764 (stcb != NULL) && 5765 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5766 !stcb->asoc.authenticated) { 5767 /* "silently" ignore */ 5768 SCTP_STAT_INCR(sctps_recvauthmissing); 5769 SCTPDBG(SCTP_DEBUG_AUTH1, 5770 "Data chunk requires AUTH, skipped\n"); 5771 goto trigger_send; 5772 } 5773 if (length > offset) { 5774 int retval; 5775 5776 /* 5777 * First check to make sure our state is correct. We would 5778 * not get here unless we really did have a tag, so we don't 5779 * abort if this happens, just dump the chunk silently. 5780 */ 5781 switch (SCTP_GET_STATE(stcb)) { 5782 case SCTP_STATE_COOKIE_ECHOED: 5783 /* 5784 * we consider data with valid tags in this state 5785 * shows us the cookie-ack was lost. Imply it was 5786 * there. 5787 */ 5788 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5789 break; 5790 case SCTP_STATE_COOKIE_WAIT: 5791 /* 5792 * We consider OOTB any data sent during asoc setup. 5793 */ 5794 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5795 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5796 msg); 5797 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5798 mflowtype, mflowid, inp->fibnum, 5799 vrf_id, port); 5800 goto out; 5801 /* sa_ignore NOTREACHED */ 5802 break; 5803 case SCTP_STATE_EMPTY: /* should not happen */ 5804 case SCTP_STATE_INUSE: /* should not happen */ 5805 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5806 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5807 default: 5808 goto out; 5809 /* sa_ignore NOTREACHED */ 5810 break; 5811 case SCTP_STATE_OPEN: 5812 case SCTP_STATE_SHUTDOWN_SENT: 5813 break; 5814 } 5815 /* plow through the data chunks while length > offset */ 5816 retval = sctp_process_data(mm, iphlen, &offset, length, 5817 inp, stcb, net, &high_tsn); 5818 if (retval == 2) { 5819 /* 5820 * The association aborted, NO UNLOCK needed since 5821 * the association is destroyed. 5822 */ 5823 stcb = NULL; 5824 goto out; 5825 } 5826 data_processed = 1; 5827 /* 5828 * Anything important needs to have been m_copy'ed in 5829 * process_data 5830 */ 5831 } 5832 5833 /* take care of ecn */ 5834 if ((data_processed == 1) && 5835 (stcb->asoc.ecn_supported == 1) && 5836 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5837 /* Yep, we need to add a ECNE */ 5838 sctp_send_ecn_echo(stcb, net, high_tsn); 5839 } 5840 5841 if ((data_processed == 0) && (fwd_tsn_seen)) { 5842 int was_a_gap; 5843 uint32_t highest_tsn; 5844 5845 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5846 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5847 } else { 5848 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5849 } 5850 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5851 stcb->asoc.send_sack = 1; 5852 sctp_sack_check(stcb, was_a_gap); 5853 } else if (fwd_tsn_seen) { 5854 stcb->asoc.send_sack = 1; 5855 } 5856 /* trigger send of any chunks in queue... */ 5857 trigger_send: 5858 #ifdef SCTP_AUDITING_ENABLED 5859 sctp_audit_log(0xE0, 2); 5860 sctp_auditing(1, inp, stcb, net); 5861 #endif 5862 SCTPDBG(SCTP_DEBUG_INPUT1, 5863 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5864 stcb->asoc.peers_rwnd, 5865 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5866 stcb->asoc.total_flight); 5867 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5868 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5869 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5870 } 5871 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5872 cnt_ctrl_ready || 5873 stcb->asoc.trigger_reset || 5874 ((un_sent) && 5875 (stcb->asoc.peers_rwnd > 0 || 5876 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5877 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5878 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5879 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5880 } 5881 #ifdef SCTP_AUDITING_ENABLED 5882 sctp_audit_log(0xE0, 3); 5883 sctp_auditing(2, inp, stcb, net); 5884 #endif 5885 out: 5886 if (stcb != NULL) { 5887 SCTP_TCB_UNLOCK(stcb); 5888 } 5889 if (inp_decr != NULL) { 5890 /* reduce ref-count */ 5891 SCTP_INP_WLOCK(inp_decr); 5892 SCTP_INP_DECR_REF(inp_decr); 5893 SCTP_INP_WUNLOCK(inp_decr); 5894 } 5895 return; 5896 } 5897 5898 #ifdef INET 5899 void 5900 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5901 { 5902 struct mbuf *m; 5903 int iphlen; 5904 uint32_t vrf_id = 0; 5905 uint8_t ecn_bits; 5906 struct sockaddr_in src, dst; 5907 struct ip *ip; 5908 struct sctphdr *sh; 5909 struct sctp_chunkhdr *ch; 5910 int length, offset; 5911 uint8_t compute_crc; 5912 uint32_t mflowid; 5913 uint8_t mflowtype; 5914 uint16_t fibnum; 5915 5916 iphlen = off; 5917 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5918 SCTP_RELEASE_PKT(i_pak); 5919 return; 5920 } 5921 m = SCTP_HEADER_TO_CHAIN(i_pak); 5922 #ifdef SCTP_MBUF_LOGGING 5923 /* Log in any input mbufs */ 5924 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5925 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5926 } 5927 #endif 5928 #ifdef SCTP_PACKET_LOGGING 5929 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5930 sctp_packet_log(m); 5931 } 5932 #endif 5933 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5934 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5935 m->m_pkthdr.len, 5936 if_name(m->m_pkthdr.rcvif), 5937 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5938 mflowid = m->m_pkthdr.flowid; 5939 mflowtype = M_HASHTYPE_GET(m); 5940 fibnum = M_GETFIB(m); 5941 SCTP_STAT_INCR(sctps_recvpackets); 5942 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5943 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5944 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5945 if (SCTP_BUF_LEN(m) < offset) { 5946 if ((m = m_pullup(m, offset)) == NULL) { 5947 SCTP_STAT_INCR(sctps_hdrops); 5948 return; 5949 } 5950 } 5951 ip = mtod(m, struct ip *); 5952 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5953 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5954 offset -= sizeof(struct sctp_chunkhdr); 5955 memset(&src, 0, sizeof(struct sockaddr_in)); 5956 src.sin_family = AF_INET; 5957 src.sin_len = sizeof(struct sockaddr_in); 5958 src.sin_port = sh->src_port; 5959 src.sin_addr = ip->ip_src; 5960 memset(&dst, 0, sizeof(struct sockaddr_in)); 5961 dst.sin_family = AF_INET; 5962 dst.sin_len = sizeof(struct sockaddr_in); 5963 dst.sin_port = sh->dest_port; 5964 dst.sin_addr = ip->ip_dst; 5965 length = ntohs(ip->ip_len); 5966 /* Validate mbuf chain length with IP payload length. */ 5967 if (SCTP_HEADER_LEN(m) != length) { 5968 SCTPDBG(SCTP_DEBUG_INPUT1, 5969 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5970 SCTP_STAT_INCR(sctps_hdrops); 5971 goto out; 5972 } 5973 /* SCTP does not allow broadcasts or multicasts */ 5974 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5975 goto out; 5976 } 5977 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5978 goto out; 5979 } 5980 ecn_bits = ip->ip_tos; 5981 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5982 SCTP_STAT_INCR(sctps_recvhwcrc); 5983 compute_crc = 0; 5984 } else { 5985 SCTP_STAT_INCR(sctps_recvswcrc); 5986 compute_crc = 1; 5987 } 5988 sctp_common_input_processing(&m, iphlen, offset, length, 5989 (struct sockaddr *)&src, 5990 (struct sockaddr *)&dst, 5991 sh, ch, 5992 compute_crc, 5993 ecn_bits, 5994 mflowtype, mflowid, fibnum, 5995 vrf_id, port); 5996 out: 5997 if (m) { 5998 sctp_m_freem(m); 5999 } 6000 return; 6001 } 6002 6003 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6004 extern int *sctp_cpuarry; 6005 #endif 6006 6007 int 6008 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6009 { 6010 struct mbuf *m; 6011 int off; 6012 6013 m = *mp; 6014 off = *offp; 6015 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6016 if (mp_ncpus > 1) { 6017 struct ip *ip; 6018 struct sctphdr *sh; 6019 int offset; 6020 int cpu_to_use; 6021 uint32_t flowid, tag; 6022 6023 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6024 flowid = m->m_pkthdr.flowid; 6025 } else { 6026 /* 6027 * No flow id built by lower layers fix it so we 6028 * create one. 6029 */ 6030 offset = off + sizeof(struct sctphdr); 6031 if (SCTP_BUF_LEN(m) < offset) { 6032 if ((m = m_pullup(m, offset)) == NULL) { 6033 SCTP_STAT_INCR(sctps_hdrops); 6034 return (IPPROTO_DONE); 6035 } 6036 } 6037 ip = mtod(m, struct ip *); 6038 sh = (struct sctphdr *)((caddr_t)ip + off); 6039 tag = htonl(sh->v_tag); 6040 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6041 m->m_pkthdr.flowid = flowid; 6042 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6043 } 6044 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6045 sctp_queue_to_mcore(m, off, cpu_to_use); 6046 return (IPPROTO_DONE); 6047 } 6048 #endif 6049 sctp_input_with_port(m, off, 0); 6050 return (IPPROTO_DONE); 6051 } 6052 #endif 6053