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