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