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