1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 59 60 static void 61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 62 { 63 struct sctp_nets *net; 64 65 /* 66 * This now not only stops all cookie timers it also stops any INIT 67 * timers as well. This will make sure that the timers are stopped 68 * in all collision cases. 69 */ 70 SCTP_TCB_LOCK_ASSERT(stcb); 71 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 72 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 77 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 78 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 79 stcb->sctp_ep, 80 stcb, 81 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 82 } 83 } 84 } 85 86 /* INIT handler */ 87 static void 88 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 89 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 90 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 91 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 92 uint8_t mflowtype, uint32_t mflowid, 93 uint32_t vrf_id, uint16_t port) 94 { 95 struct sctp_init *init; 96 struct mbuf *op_err; 97 98 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 99 (void *)stcb); 100 if (stcb == NULL) { 101 SCTP_INP_RLOCK(inp); 102 } 103 /* validate length */ 104 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 105 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 106 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 107 mflowtype, mflowid, 108 vrf_id, port); 109 if (stcb) 110 *abort_no_unlock = 1; 111 goto outnow; 112 } 113 /* validate parameters */ 114 init = &cp->init; 115 if (init->initiate_tag == 0) { 116 /* protocol error... send abort */ 117 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 118 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 119 mflowtype, mflowid, 120 vrf_id, port); 121 if (stcb) 122 *abort_no_unlock = 1; 123 goto outnow; 124 } 125 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 126 /* invalid parameter... send abort */ 127 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 128 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 129 mflowtype, mflowid, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_inbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 138 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 139 mflowtype, mflowid, 140 vrf_id, port); 141 if (stcb) 142 *abort_no_unlock = 1; 143 goto outnow; 144 } 145 if (init->num_outbound_streams == 0) { 146 /* protocol error... send abort */ 147 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 148 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 149 mflowtype, mflowid, 150 vrf_id, port); 151 if (stcb) 152 *abort_no_unlock = 1; 153 goto outnow; 154 } 155 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 156 offset + ntohs(cp->ch.chunk_length))) { 157 /* auth parameter(s) error... send abort */ 158 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 159 "Problem with AUTH parameters"); 160 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 161 mflowtype, mflowid, 162 vrf_id, port); 163 if (stcb) 164 *abort_no_unlock = 1; 165 goto outnow; 166 } 167 /* We are only accepting if we have a listening socket. */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (!SCTP_IS_LISTENING(inp)))) { 172 /* 173 * FIX ME ?? What about TCP model and we have a 174 * match/restart case? Actually no fix is needed. the lookup 175 * will always find the existing assoc so stcb would not be 176 * NULL. It may be questionable to do this since we COULD 177 * just send back the INIT-ACK and hope that the app did 178 * accept()'s by the time the COOKIE was sent. But there is 179 * a price to pay for COOKIE generation and I don't want to 180 * pay it on the chance that the app will actually do some 181 * accepts(). The App just looses and should NOT be in this 182 * state :-) 183 */ 184 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 185 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 186 "No listener"); 187 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 188 mflowtype, mflowid, inp->fibnum, 189 vrf_id, port); 190 } 191 goto outnow; 192 } 193 if ((stcb != NULL) && 194 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 195 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 196 sctp_send_shutdown_ack(stcb, NULL); 197 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 198 } else { 199 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 200 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 201 src, dst, sh, cp, 202 mflowtype, mflowid, 203 vrf_id, port); 204 } 205 outnow: 206 if (stcb == NULL) { 207 SCTP_INP_RUNLOCK(inp); 208 } 209 } 210 211 /* 212 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 213 */ 214 215 int 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 217 SCTP_UNUSED 218 ) 219 { 220 int unsent_data; 221 unsigned int i; 222 struct sctp_stream_queue_pending *sp; 223 struct sctp_association *asoc; 224 225 /* 226 * This function returns if any stream has true unsent data on it. 227 * Note that as it looks through it will clean up any places that 228 * have old data that has been sent but left at top of stream queue. 229 */ 230 asoc = &stcb->asoc; 231 unsent_data = 0; 232 SCTP_TCB_SEND_LOCK(stcb); 233 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 234 /* Check to see if some data queued */ 235 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 236 /* sa_ignore FREED_MEMORY */ 237 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 238 if (sp == NULL) { 239 continue; 240 } 241 if ((sp->msg_is_complete) && 242 (sp->length == 0) && 243 (sp->sender_all_done)) { 244 /* 245 * We are doing differed cleanup. Last time 246 * through when we took all the data the 247 * sender_all_done was not set. 248 */ 249 if (sp->put_last_out == 0) { 250 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 251 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 252 sp->sender_all_done, 253 sp->length, 254 sp->msg_is_complete, 255 sp->put_last_out); 256 } 257 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 258 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 259 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 260 if (sp->net) { 261 sctp_free_remote_addr(sp->net); 262 sp->net = NULL; 263 } 264 if (sp->data) { 265 sctp_m_freem(sp->data); 266 sp->data = NULL; 267 } 268 sctp_free_a_strmoq(stcb, sp, so_locked); 269 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 270 unsent_data++; 271 } 272 } else { 273 unsent_data++; 274 } 275 if (unsent_data > 0) { 276 break; 277 } 278 } 279 } 280 SCTP_TCB_SEND_UNLOCK(stcb); 281 return (unsent_data); 282 } 283 284 static int 285 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 286 { 287 struct sctp_init *init; 288 struct sctp_association *asoc; 289 struct sctp_nets *lnet; 290 unsigned int i; 291 292 init = &cp->init; 293 asoc = &stcb->asoc; 294 /* save off parameters */ 295 asoc->peer_vtag = ntohl(init->initiate_tag); 296 asoc->peers_rwnd = ntohl(init->a_rwnd); 297 /* init tsn's */ 298 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 299 300 if (!TAILQ_EMPTY(&asoc->nets)) { 301 /* update any ssthresh's that may have a default */ 302 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 303 lnet->ssthresh = asoc->peers_rwnd; 304 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 305 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 306 } 307 308 } 309 } 310 SCTP_TCB_SEND_LOCK(stcb); 311 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 312 unsigned int newcnt; 313 struct sctp_stream_out *outs; 314 struct sctp_stream_queue_pending *sp, *nsp; 315 struct sctp_tmit_chunk *chk, *nchk; 316 317 /* abandon the upper streams */ 318 newcnt = ntohs(init->num_inbound_streams); 319 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 320 if (chk->rec.data.sid >= newcnt) { 321 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 322 asoc->send_queue_cnt--; 323 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 324 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 325 #ifdef INVARIANTS 326 } else { 327 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 328 #endif 329 } 330 if (chk->data != NULL) { 331 sctp_free_bufspace(stcb, asoc, chk, 1); 332 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 333 0, chk, SCTP_SO_NOT_LOCKED); 334 if (chk->data) { 335 sctp_m_freem(chk->data); 336 chk->data = NULL; 337 } 338 } 339 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 340 /* sa_ignore FREED_MEMORY */ 341 } 342 } 343 if (asoc->strmout) { 344 for (i = newcnt; i < asoc->pre_open_streams; i++) { 345 outs = &asoc->strmout[i]; 346 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 347 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 348 TAILQ_REMOVE(&outs->outqueue, sp, next); 349 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 350 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 351 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 352 if (sp->data) { 353 sctp_m_freem(sp->data); 354 sp->data = NULL; 355 } 356 if (sp->net) { 357 sctp_free_remote_addr(sp->net); 358 sp->net = NULL; 359 } 360 /* Free the chunk */ 361 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 362 /* sa_ignore FREED_MEMORY */ 363 } 364 outs->state = SCTP_STREAM_CLOSED; 365 } 366 } 367 /* cut back the count */ 368 asoc->pre_open_streams = newcnt; 369 } 370 SCTP_TCB_SEND_UNLOCK(stcb); 371 asoc->streamoutcnt = asoc->pre_open_streams; 372 if (asoc->strmout) { 373 for (i = 0; i < asoc->streamoutcnt; i++) { 374 asoc->strmout[i].state = SCTP_STREAM_OPEN; 375 } 376 } 377 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 378 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 379 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 380 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 381 } 382 /* This is the next one we expect */ 383 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 384 385 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 386 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 387 388 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 389 /* open the requested streams */ 390 391 if (asoc->strmin != NULL) { 392 /* Free the old ones */ 393 for (i = 0; i < asoc->streamincnt; i++) { 394 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 395 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 396 } 397 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 398 } 399 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 400 asoc->streamincnt = ntohs(init->num_outbound_streams); 401 } else { 402 asoc->streamincnt = asoc->max_inbound_streams; 403 } 404 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 405 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 406 if (asoc->strmin == NULL) { 407 /* we didn't get memory for the streams! */ 408 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 409 return (-1); 410 } 411 for (i = 0; i < asoc->streamincnt; i++) { 412 asoc->strmin[i].sid = i; 413 asoc->strmin[i].last_mid_delivered = 0xffffffff; 414 TAILQ_INIT(&asoc->strmin[i].inqueue); 415 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 416 asoc->strmin[i].pd_api_started = 0; 417 asoc->strmin[i].delivery_started = 0; 418 } 419 /* 420 * load_address_from_init will put the addresses into the 421 * association when the COOKIE is processed or the INIT-ACK is 422 * processed. Both types of COOKIE's existing and new call this 423 * routine. It will remove addresses that are no longer in the 424 * association (for the restarting case where addresses are 425 * removed). Up front when the INIT arrives we will discard it if it 426 * is a restart and new addresses have been added. 427 */ 428 /* sa_ignore MEMLEAK */ 429 return (0); 430 } 431 432 /* 433 * INIT-ACK message processing/consumption returns value < 0 on error 434 */ 435 static int 436 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 437 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 438 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 439 struct sctp_nets *net, int *abort_no_unlock, 440 uint8_t mflowtype, uint32_t mflowid, 441 uint32_t vrf_id) 442 { 443 struct sctp_association *asoc; 444 struct mbuf *op_err; 445 int retval, abort_flag, cookie_found; 446 int initack_limit; 447 int nat_friendly = 0; 448 449 /* First verify that we have no illegal param's */ 450 abort_flag = 0; 451 cookie_found = 0; 452 453 op_err = sctp_arethere_unrecognized_parameters(m, 454 (offset + sizeof(struct sctp_init_chunk)), 455 &abort_flag, (struct sctp_chunkhdr *)cp, 456 &nat_friendly, &cookie_found); 457 if (abort_flag) { 458 /* Send an abort and notify peer */ 459 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 460 *abort_no_unlock = 1; 461 return (-1); 462 } 463 if (!cookie_found) { 464 uint16_t len; 465 466 /* Only report the missing cookie parameter */ 467 if (op_err != NULL) { 468 sctp_m_freem(op_err); 469 } 470 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 471 /* We abort with an error of missing mandatory param */ 472 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 473 if (op_err != NULL) { 474 struct sctp_error_missing_param *cause; 475 476 SCTP_BUF_LEN(op_err) = len; 477 cause = mtod(op_err, struct sctp_error_missing_param *); 478 /* Subtract the reserved param */ 479 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 480 cause->cause.length = htons(len); 481 cause->num_missing_params = htonl(1); 482 cause->type[0] = htons(SCTP_STATE_COOKIE); 483 } 484 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 485 src, dst, sh, op_err, 486 mflowtype, mflowid, 487 vrf_id, net->port); 488 *abort_no_unlock = 1; 489 return (-3); 490 } 491 asoc = &stcb->asoc; 492 asoc->peer_supports_nat = (uint8_t)nat_friendly; 493 /* process the peer's parameters in the INIT-ACK */ 494 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 495 if (retval < 0) { 496 if (op_err != NULL) { 497 sctp_m_freem(op_err); 498 } 499 return (retval); 500 } 501 initack_limit = offset + ntohs(cp->ch.chunk_length); 502 /* load all addresses */ 503 if ((retval = sctp_load_addresses_from_init(stcb, m, 504 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 505 src, dst, NULL, stcb->asoc.port))) { 506 if (op_err != NULL) { 507 sctp_m_freem(op_err); 508 } 509 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 510 "Problem with address parameters"); 511 SCTPDBG(SCTP_DEBUG_INPUT1, 512 "Load addresses from INIT causes an abort %d\n", 513 retval); 514 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 515 src, dst, sh, op_err, 516 mflowtype, mflowid, 517 vrf_id, net->port); 518 *abort_no_unlock = 1; 519 return (-1); 520 } 521 /* if the peer doesn't support asconf, flush the asconf queue */ 522 if (asoc->asconf_supported == 0) { 523 struct sctp_asconf_addr *param, *nparam; 524 525 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 526 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 527 SCTP_FREE(param, SCTP_M_ASC_ADDR); 528 } 529 } 530 531 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 532 stcb->asoc.local_hmacs); 533 if (op_err) { 534 sctp_queue_op_err(stcb, op_err); 535 /* queuing will steal away the mbuf chain to the out queue */ 536 op_err = NULL; 537 } 538 /* extract the cookie and queue it to "echo" it back... */ 539 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 540 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 541 stcb->asoc.overall_error_count, 542 0, 543 SCTP_FROM_SCTP_INPUT, 544 __LINE__); 545 } 546 stcb->asoc.overall_error_count = 0; 547 net->error_count = 0; 548 549 /* 550 * Cancel the INIT timer, We do this first before queueing the 551 * cookie. We always cancel at the primary to assue that we are 552 * canceling the timer started by the INIT which always goes to the 553 * primary. 554 */ 555 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 556 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 557 558 /* calculate the RTO */ 559 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 560 SCTP_RTT_FROM_NON_DATA); 561 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 562 return (retval); 563 } 564 565 static void 566 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 567 struct sctp_tcb *stcb, struct sctp_nets *net) 568 { 569 union sctp_sockstore store; 570 struct sctp_nets *r_net, *f_net; 571 struct timeval tv; 572 int req_prim = 0; 573 uint16_t old_error_counter; 574 575 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 576 /* Invalid length */ 577 return; 578 } 579 580 memset(&store, 0, sizeof(store)); 581 switch (cp->heartbeat.hb_info.addr_family) { 582 #ifdef INET 583 case AF_INET: 584 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 585 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 586 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 587 store.sin.sin_port = stcb->rport; 588 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 589 sizeof(store.sin.sin_addr)); 590 } else { 591 return; 592 } 593 break; 594 #endif 595 #ifdef INET6 596 case AF_INET6: 597 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 598 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 599 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 600 store.sin6.sin6_port = stcb->rport; 601 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 602 } else { 603 return; 604 } 605 break; 606 #endif 607 default: 608 return; 609 } 610 r_net = sctp_findnet(stcb, &store.sa); 611 if (r_net == NULL) { 612 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 613 return; 614 } 615 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 616 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 617 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 618 /* 619 * If the its a HB and it's random value is correct when can 620 * confirm the destination. 621 */ 622 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 623 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 624 stcb->asoc.primary_destination = r_net; 625 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 626 f_net = TAILQ_FIRST(&stcb->asoc.nets); 627 if (f_net != r_net) { 628 /* 629 * first one on the list is NOT the primary 630 * sctp_cmpaddr() is much more efficient if 631 * the primary is the first on the list, 632 * make it so. 633 */ 634 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 635 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 636 } 637 req_prim = 1; 638 } 639 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 640 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 641 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 642 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 643 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 644 } 645 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 646 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 647 stcb->asoc.overall_error_count, 648 0, 649 SCTP_FROM_SCTP_INPUT, 650 __LINE__); 651 } 652 stcb->asoc.overall_error_count = 0; 653 old_error_counter = r_net->error_count; 654 r_net->error_count = 0; 655 r_net->hb_responded = 1; 656 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 657 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 658 /* Now lets do a RTO with this */ 659 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 660 SCTP_RTT_FROM_NON_DATA); 661 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 662 r_net->dest_state |= SCTP_ADDR_REACHABLE; 663 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 664 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 665 } 666 if (r_net->dest_state & SCTP_ADDR_PF) { 667 r_net->dest_state &= ~SCTP_ADDR_PF; 668 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 669 } 670 if (old_error_counter > 0) { 671 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 672 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 673 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 674 } 675 if (r_net == stcb->asoc.primary_destination) { 676 if (stcb->asoc.alternate) { 677 /* release the alternate, primary is good */ 678 sctp_free_remote_addr(stcb->asoc.alternate); 679 stcb->asoc.alternate = NULL; 680 } 681 } 682 /* Mobility adaptation */ 683 if (req_prim) { 684 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 685 SCTP_MOBILITY_BASE) || 686 sctp_is_mobility_feature_on(stcb->sctp_ep, 687 SCTP_MOBILITY_FASTHANDOFF)) && 688 sctp_is_mobility_feature_on(stcb->sctp_ep, 689 SCTP_MOBILITY_PRIM_DELETED)) { 690 691 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 692 stcb->sctp_ep, stcb, NULL, 693 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 694 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 695 SCTP_MOBILITY_FASTHANDOFF)) { 696 sctp_assoc_immediate_retrans(stcb, 697 stcb->asoc.primary_destination); 698 } 699 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 700 SCTP_MOBILITY_BASE)) { 701 sctp_move_chunks_from_net(stcb, 702 stcb->asoc.deleted_primary); 703 } 704 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 705 } 706 } 707 } 708 709 static int 710 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 711 { 712 /* 713 * Return 0 means we want you to proceed with the abort non-zero 714 * means no abort processing. 715 */ 716 uint32_t new_vtag; 717 struct sctpasochead *head; 718 719 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 720 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 721 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 722 atomic_add_int(&stcb->asoc.refcnt, 1); 723 SCTP_TCB_UNLOCK(stcb); 724 SCTP_INP_INFO_WLOCK(); 725 SCTP_TCB_LOCK(stcb); 726 atomic_subtract_int(&stcb->asoc.refcnt, 1); 727 } else { 728 return (0); 729 } 730 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 731 /* generate a new vtag and send init */ 732 LIST_REMOVE(stcb, sctp_asocs); 733 stcb->asoc.my_vtag = new_vtag; 734 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 735 /* 736 * put it in the bucket in the vtag hash of assoc's for the 737 * system 738 */ 739 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 740 SCTP_INP_INFO_WUNLOCK(); 741 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 742 return (1); 743 } else { 744 /* 745 * treat like a case where the cookie expired i.e.: - dump 746 * current cookie. - generate a new vtag. - resend init. 747 */ 748 /* generate a new vtag and send init */ 749 LIST_REMOVE(stcb, sctp_asocs); 750 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 751 sctp_stop_all_cookie_timers(stcb); 752 sctp_toss_old_cookies(stcb, &stcb->asoc); 753 stcb->asoc.my_vtag = new_vtag; 754 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 755 /* 756 * put it in the bucket in the vtag hash of assoc's for the 757 * system 758 */ 759 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 760 SCTP_INP_INFO_WUNLOCK(); 761 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 762 return (1); 763 } 764 return (0); 765 } 766 767 static int 768 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 769 struct sctp_nets *net) 770 { 771 /* 772 * return 0 means we want you to proceed with the abort non-zero 773 * means no abort processing 774 */ 775 if (stcb->asoc.auth_supported == 0) { 776 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 777 return (0); 778 } 779 sctp_asconf_send_nat_state_update(stcb, net); 780 return (1); 781 } 782 783 784 /* Returns 1 if the stcb was aborted, 0 otherwise */ 785 static int 786 sctp_handle_abort(struct sctp_abort_chunk *abort, 787 struct sctp_tcb *stcb, struct sctp_nets *net) 788 { 789 uint16_t len; 790 uint16_t error; 791 792 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 793 if (stcb == NULL) 794 return (0); 795 796 len = ntohs(abort->ch.chunk_length); 797 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 798 /* 799 * Need to check the cause codes for our two magic nat 800 * aborts which don't kill the assoc necessarily. 801 */ 802 struct sctp_error_cause *cause; 803 804 cause = (struct sctp_error_cause *)(abort + 1); 805 error = ntohs(cause->code); 806 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 807 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 808 abort->ch.chunk_flags); 809 if (sctp_handle_nat_colliding_state(stcb)) { 810 return (0); 811 } 812 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 813 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 814 abort->ch.chunk_flags); 815 if (sctp_handle_nat_missing_state(stcb, net)) { 816 return (0); 817 } 818 } 819 } else { 820 error = 0; 821 } 822 /* stop any receive timers */ 823 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 824 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 825 /* notify user of the abort and clean up... */ 826 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 827 /* free the tcb */ 828 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 829 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 830 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 831 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 832 } 833 #ifdef SCTP_ASOCLOG_OF_TSNS 834 sctp_print_out_track_log(stcb); 835 #endif 836 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); 837 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 838 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 839 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 840 return (1); 841 } 842 843 static void 844 sctp_start_net_timers(struct sctp_tcb *stcb) 845 { 846 uint32_t cnt_hb_sent; 847 struct sctp_nets *net; 848 849 cnt_hb_sent = 0; 850 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 851 /* 852 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 853 * If the dest in unconfirmed send a hb as well if under 854 * max_hb_burst have been sent. 855 */ 856 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 857 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 858 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 859 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 860 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 861 cnt_hb_sent++; 862 } 863 } 864 if (cnt_hb_sent) { 865 sctp_chunk_output(stcb->sctp_ep, stcb, 866 SCTP_OUTPUT_FROM_COOKIE_ACK, 867 SCTP_SO_NOT_LOCKED); 868 } 869 } 870 871 872 static void 873 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 874 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 875 { 876 struct sctp_association *asoc; 877 int some_on_streamwheel; 878 int old_state; 879 880 SCTPDBG(SCTP_DEBUG_INPUT2, 881 "sctp_handle_shutdown: handling SHUTDOWN\n"); 882 if (stcb == NULL) 883 return; 884 asoc = &stcb->asoc; 885 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 886 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 887 return; 888 } 889 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 890 /* Shutdown NOT the expected size */ 891 return; 892 } 893 old_state = SCTP_GET_STATE(stcb); 894 sctp_update_acked(stcb, cp, abort_flag); 895 if (*abort_flag) { 896 return; 897 } 898 if (asoc->control_pdapi) { 899 /* 900 * With a normal shutdown we assume the end of last record. 901 */ 902 SCTP_INP_READ_LOCK(stcb->sctp_ep); 903 if (asoc->control_pdapi->on_strm_q) { 904 struct sctp_stream_in *strm; 905 906 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 907 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 908 /* Unordered */ 909 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 910 asoc->control_pdapi->on_strm_q = 0; 911 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 912 /* Ordered */ 913 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 914 asoc->control_pdapi->on_strm_q = 0; 915 #ifdef INVARIANTS 916 } else { 917 panic("Unknown state on ctrl:%p on_strm_q:%d", 918 asoc->control_pdapi, 919 asoc->control_pdapi->on_strm_q); 920 #endif 921 } 922 } 923 asoc->control_pdapi->end_added = 1; 924 asoc->control_pdapi->pdapi_aborted = 1; 925 asoc->control_pdapi = NULL; 926 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 927 if (stcb->sctp_socket) { 928 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 929 } 930 } 931 /* goto SHUTDOWN_RECEIVED state to block new requests */ 932 if (stcb->sctp_socket) { 933 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 934 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 935 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 936 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 937 /* 938 * notify upper layer that peer has initiated a 939 * shutdown 940 */ 941 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 942 943 /* reset time */ 944 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 945 } 946 } 947 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 948 /* 949 * stop the shutdown timer, since we WILL move to 950 * SHUTDOWN-ACK-SENT. 951 */ 952 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 953 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 954 } 955 /* Now is there unsent data on a stream somewhere? */ 956 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 957 958 if (!TAILQ_EMPTY(&asoc->send_queue) || 959 !TAILQ_EMPTY(&asoc->sent_queue) || 960 some_on_streamwheel) { 961 /* By returning we will push more data out */ 962 return; 963 } else { 964 /* no outstanding data to send, so move on... */ 965 /* send SHUTDOWN-ACK */ 966 /* move to SHUTDOWN-ACK-SENT state */ 967 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 968 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 969 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 970 } 971 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 972 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 973 sctp_stop_timers_for_shutdown(stcb); 974 sctp_send_shutdown_ack(stcb, net); 975 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 976 stcb->sctp_ep, stcb, net); 977 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 978 sctp_send_shutdown_ack(stcb, net); 979 } 980 } 981 } 982 983 static void 984 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 985 struct sctp_tcb *stcb, 986 struct sctp_nets *net) 987 { 988 struct sctp_association *asoc; 989 990 SCTPDBG(SCTP_DEBUG_INPUT2, 991 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 992 if (stcb == NULL) 993 return; 994 995 asoc = &stcb->asoc; 996 /* process according to association state */ 997 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 998 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 999 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1000 sctp_send_shutdown_complete(stcb, net, 1); 1001 SCTP_TCB_UNLOCK(stcb); 1002 return; 1003 } 1004 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 1005 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1006 /* unexpected SHUTDOWN-ACK... so ignore... */ 1007 SCTP_TCB_UNLOCK(stcb); 1008 return; 1009 } 1010 if (asoc->control_pdapi) { 1011 /* 1012 * With a normal shutdown we assume the end of last record. 1013 */ 1014 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1015 asoc->control_pdapi->end_added = 1; 1016 asoc->control_pdapi->pdapi_aborted = 1; 1017 asoc->control_pdapi = NULL; 1018 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1019 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1020 } 1021 #ifdef INVARIANTS 1022 if (!TAILQ_EMPTY(&asoc->send_queue) || 1023 !TAILQ_EMPTY(&asoc->sent_queue) || 1024 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1025 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1026 } 1027 #endif 1028 /* stop the timer */ 1029 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1030 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1031 /* send SHUTDOWN-COMPLETE */ 1032 sctp_send_shutdown_complete(stcb, net, 0); 1033 /* notify upper layer protocol */ 1034 if (stcb->sctp_socket) { 1035 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1036 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1037 stcb->sctp_socket->so_snd.sb_cc = 0; 1038 } 1039 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1040 } 1041 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1042 /* free the TCB but first save off the ep */ 1043 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1044 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1045 } 1046 1047 static void 1048 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1049 { 1050 switch (chunk_type) { 1051 case SCTP_ASCONF_ACK: 1052 case SCTP_ASCONF: 1053 sctp_asconf_cleanup(stcb); 1054 break; 1055 case SCTP_IFORWARD_CUM_TSN: 1056 case SCTP_FORWARD_CUM_TSN: 1057 stcb->asoc.prsctp_supported = 0; 1058 break; 1059 default: 1060 SCTPDBG(SCTP_DEBUG_INPUT2, 1061 "Peer does not support chunk type %d (0x%x).\n", 1062 chunk_type, chunk_type); 1063 break; 1064 } 1065 } 1066 1067 /* 1068 * Skip past the param header and then we will find the param that caused the 1069 * problem. There are a number of param's in a ASCONF OR the prsctp param 1070 * these will turn of specific features. 1071 * XXX: Is this the right thing to do? 1072 */ 1073 static void 1074 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1075 { 1076 switch (parameter_type) { 1077 /* pr-sctp draft */ 1078 case SCTP_PRSCTP_SUPPORTED: 1079 stcb->asoc.prsctp_supported = 0; 1080 break; 1081 case SCTP_SUPPORTED_CHUNK_EXT: 1082 break; 1083 /* draft-ietf-tsvwg-addip-sctp */ 1084 case SCTP_HAS_NAT_SUPPORT: 1085 stcb->asoc.peer_supports_nat = 0; 1086 break; 1087 case SCTP_ADD_IP_ADDRESS: 1088 case SCTP_DEL_IP_ADDRESS: 1089 case SCTP_SET_PRIM_ADDR: 1090 stcb->asoc.asconf_supported = 0; 1091 break; 1092 case SCTP_SUCCESS_REPORT: 1093 case SCTP_ERROR_CAUSE_IND: 1094 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1095 SCTPDBG(SCTP_DEBUG_INPUT2, 1096 "Turning off ASCONF to this strange peer\n"); 1097 stcb->asoc.asconf_supported = 0; 1098 break; 1099 default: 1100 SCTPDBG(SCTP_DEBUG_INPUT2, 1101 "Peer does not support param type %d (0x%x)??\n", 1102 parameter_type, parameter_type); 1103 break; 1104 } 1105 } 1106 1107 static int 1108 sctp_handle_error(struct sctp_chunkhdr *ch, 1109 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1110 { 1111 struct sctp_error_cause *cause; 1112 struct sctp_association *asoc; 1113 uint32_t remaining_length, adjust; 1114 uint16_t code, cause_code, cause_length; 1115 1116 /* parse through all of the errors and process */ 1117 asoc = &stcb->asoc; 1118 cause = (struct sctp_error_cause *)((caddr_t)ch + 1119 sizeof(struct sctp_chunkhdr)); 1120 remaining_length = ntohs(ch->chunk_length); 1121 if (remaining_length > limit) { 1122 remaining_length = limit; 1123 } 1124 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1125 remaining_length -= sizeof(struct sctp_chunkhdr); 1126 } else { 1127 remaining_length = 0; 1128 } 1129 code = 0; 1130 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1131 /* Process an Error Cause */ 1132 cause_code = ntohs(cause->code); 1133 cause_length = ntohs(cause->length); 1134 if ((cause_length > remaining_length) || (cause_length == 0)) { 1135 /* Invalid cause length, possibly due to truncation. */ 1136 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1137 remaining_length, cause_length); 1138 return (0); 1139 } 1140 if (code == 0) { 1141 /* report the first error cause */ 1142 code = cause_code; 1143 } 1144 switch (cause_code) { 1145 case SCTP_CAUSE_INVALID_STREAM: 1146 case SCTP_CAUSE_MISSING_PARAM: 1147 case SCTP_CAUSE_INVALID_PARAM: 1148 case SCTP_CAUSE_NO_USER_DATA: 1149 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1150 cause_code); 1151 break; 1152 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1153 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1154 ch->chunk_flags); 1155 if (sctp_handle_nat_colliding_state(stcb)) { 1156 return (0); 1157 } 1158 break; 1159 case SCTP_CAUSE_NAT_MISSING_STATE: 1160 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1161 ch->chunk_flags); 1162 if (sctp_handle_nat_missing_state(stcb, net)) { 1163 return (0); 1164 } 1165 break; 1166 case SCTP_CAUSE_STALE_COOKIE: 1167 /* 1168 * We only act if we have echoed a cookie and are 1169 * waiting. 1170 */ 1171 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1172 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1173 struct sctp_error_stale_cookie *stale_cookie; 1174 1175 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1176 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1177 /* Double it to be more robust on RTX */ 1178 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1179 asoc->cookie_preserve_req *= 2; 1180 } else { 1181 asoc->cookie_preserve_req = UINT32_MAX; 1182 } 1183 asoc->stale_cookie_count++; 1184 if (asoc->stale_cookie_count > 1185 asoc->max_init_times) { 1186 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1187 /* now free the asoc */ 1188 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1189 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1190 return (-1); 1191 } 1192 /* blast back to INIT state */ 1193 sctp_toss_old_cookies(stcb, &stcb->asoc); 1194 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1195 sctp_stop_all_cookie_timers(stcb); 1196 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1197 } 1198 break; 1199 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1200 /* 1201 * Nothing we can do here, we don't do hostname 1202 * addresses so if the peer does not like my IPv6 1203 * (or IPv4 for that matter) it does not matter. If 1204 * they don't support that type of address, they can 1205 * NOT possibly get that packet type... i.e. with no 1206 * IPv6 you can't receive a IPv6 packet. so we can 1207 * safely ignore this one. If we ever added support 1208 * for HOSTNAME Addresses, then we would need to do 1209 * something here. 1210 */ 1211 break; 1212 case SCTP_CAUSE_UNRECOG_CHUNK: 1213 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1214 struct sctp_error_unrecognized_chunk *unrec_chunk; 1215 1216 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1217 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1218 } 1219 break; 1220 case SCTP_CAUSE_UNRECOG_PARAM: 1221 /* XXX: We only consider the first parameter */ 1222 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1223 struct sctp_paramhdr *unrec_parameter; 1224 1225 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1226 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1227 } 1228 break; 1229 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1230 /* 1231 * We ignore this since the timer will drive out a 1232 * new cookie anyway and there timer will drive us 1233 * to send a SHUTDOWN_COMPLETE. We can't send one 1234 * here since we don't have their tag. 1235 */ 1236 break; 1237 case SCTP_CAUSE_DELETING_LAST_ADDR: 1238 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1239 case SCTP_CAUSE_DELETING_SRC_ADDR: 1240 /* 1241 * We should NOT get these here, but in a 1242 * ASCONF-ACK. 1243 */ 1244 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1245 cause_code); 1246 break; 1247 case SCTP_CAUSE_OUT_OF_RESC: 1248 /* 1249 * And what, pray tell do we do with the fact that 1250 * the peer is out of resources? Not really sure we 1251 * could do anything but abort. I suspect this 1252 * should have came WITH an abort instead of in a 1253 * OP-ERROR. 1254 */ 1255 break; 1256 default: 1257 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1258 cause_code); 1259 break; 1260 } 1261 adjust = SCTP_SIZE32(cause_length); 1262 if (remaining_length >= adjust) { 1263 remaining_length -= adjust; 1264 } else { 1265 remaining_length = 0; 1266 } 1267 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1268 } 1269 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1270 return (0); 1271 } 1272 1273 static int 1274 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1275 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1276 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1277 struct sctp_nets *net, int *abort_no_unlock, 1278 uint8_t mflowtype, uint32_t mflowid, 1279 uint32_t vrf_id) 1280 { 1281 struct sctp_init_ack *init_ack; 1282 struct mbuf *op_err; 1283 1284 SCTPDBG(SCTP_DEBUG_INPUT2, 1285 "sctp_handle_init_ack: handling INIT-ACK\n"); 1286 1287 if (stcb == NULL) { 1288 SCTPDBG(SCTP_DEBUG_INPUT2, 1289 "sctp_handle_init_ack: TCB is null\n"); 1290 return (-1); 1291 } 1292 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1293 /* Invalid length */ 1294 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1295 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1296 src, dst, sh, op_err, 1297 mflowtype, mflowid, 1298 vrf_id, net->port); 1299 *abort_no_unlock = 1; 1300 return (-1); 1301 } 1302 init_ack = &cp->init; 1303 /* validate parameters */ 1304 if (init_ack->initiate_tag == 0) { 1305 /* protocol error... send an abort */ 1306 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1307 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1308 src, dst, sh, op_err, 1309 mflowtype, mflowid, 1310 vrf_id, net->port); 1311 *abort_no_unlock = 1; 1312 return (-1); 1313 } 1314 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1315 /* protocol error... send an abort */ 1316 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1317 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1318 src, dst, sh, op_err, 1319 mflowtype, mflowid, 1320 vrf_id, net->port); 1321 *abort_no_unlock = 1; 1322 return (-1); 1323 } 1324 if (init_ack->num_inbound_streams == 0) { 1325 /* protocol error... send an abort */ 1326 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1327 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1328 src, dst, sh, op_err, 1329 mflowtype, mflowid, 1330 vrf_id, net->port); 1331 *abort_no_unlock = 1; 1332 return (-1); 1333 } 1334 if (init_ack->num_outbound_streams == 0) { 1335 /* protocol error... send an abort */ 1336 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1337 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1338 src, dst, sh, op_err, 1339 mflowtype, mflowid, 1340 vrf_id, net->port); 1341 *abort_no_unlock = 1; 1342 return (-1); 1343 } 1344 /* process according to association state... */ 1345 switch (SCTP_GET_STATE(stcb)) { 1346 case SCTP_STATE_COOKIE_WAIT: 1347 /* this is the expected state for this chunk */ 1348 /* process the INIT-ACK parameters */ 1349 if (stcb->asoc.primary_destination->dest_state & 1350 SCTP_ADDR_UNCONFIRMED) { 1351 /* 1352 * The primary is where we sent the INIT, we can 1353 * always consider it confirmed when the INIT-ACK is 1354 * returned. Do this before we load addresses 1355 * though. 1356 */ 1357 stcb->asoc.primary_destination->dest_state &= 1358 ~SCTP_ADDR_UNCONFIRMED; 1359 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1360 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1361 } 1362 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1363 net, abort_no_unlock, 1364 mflowtype, mflowid, 1365 vrf_id) < 0) { 1366 /* error in parsing parameters */ 1367 return (-1); 1368 } 1369 /* update our state */ 1370 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1371 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1372 1373 /* reset the RTO calc */ 1374 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1375 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1376 stcb->asoc.overall_error_count, 1377 0, 1378 SCTP_FROM_SCTP_INPUT, 1379 __LINE__); 1380 } 1381 stcb->asoc.overall_error_count = 0; 1382 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1383 /* 1384 * collapse the init timer back in case of a exponential 1385 * backoff 1386 */ 1387 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1388 stcb, net); 1389 /* 1390 * the send at the end of the inbound data processing will 1391 * cause the cookie to be sent 1392 */ 1393 break; 1394 case SCTP_STATE_SHUTDOWN_SENT: 1395 /* incorrect state... discard */ 1396 break; 1397 case SCTP_STATE_COOKIE_ECHOED: 1398 /* incorrect state... discard */ 1399 break; 1400 case SCTP_STATE_OPEN: 1401 /* incorrect state... discard */ 1402 break; 1403 case SCTP_STATE_EMPTY: 1404 case SCTP_STATE_INUSE: 1405 default: 1406 /* incorrect state... discard */ 1407 return (-1); 1408 break; 1409 } 1410 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1411 return (0); 1412 } 1413 1414 static struct sctp_tcb * 1415 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1416 struct sockaddr *src, struct sockaddr *dst, 1417 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1418 struct sctp_inpcb *inp, struct sctp_nets **netp, 1419 struct sockaddr *init_src, int *notification, 1420 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1421 uint8_t mflowtype, uint32_t mflowid, 1422 uint32_t vrf_id, uint16_t port); 1423 1424 1425 /* 1426 * handle a state cookie for an existing association m: input packet mbuf 1427 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1428 * "split" mbuf and the cookie signature does not exist offset: offset into 1429 * mbuf to the cookie-echo chunk 1430 */ 1431 static struct sctp_tcb * 1432 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1433 struct sockaddr *src, struct sockaddr *dst, 1434 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1435 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1436 struct sockaddr *init_src, int *notification, 1437 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1438 uint8_t mflowtype, uint32_t mflowid, 1439 uint32_t vrf_id, uint16_t port) 1440 { 1441 struct sctp_association *asoc; 1442 struct sctp_init_chunk *init_cp, init_buf; 1443 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1444 struct sctp_nets *net; 1445 struct mbuf *op_err; 1446 struct timeval old; 1447 int init_offset, initack_offset, i; 1448 int retval; 1449 int spec_flag = 0; 1450 uint32_t how_indx; 1451 #if defined(SCTP_DETAILED_STR_STATS) 1452 int j; 1453 #endif 1454 1455 net = *netp; 1456 /* I know that the TCB is non-NULL from the caller */ 1457 asoc = &stcb->asoc; 1458 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1459 if (asoc->cookie_how[how_indx] == 0) 1460 break; 1461 } 1462 if (how_indx < sizeof(asoc->cookie_how)) { 1463 asoc->cookie_how[how_indx] = 1; 1464 } 1465 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1466 /* SHUTDOWN came in after sending INIT-ACK */ 1467 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1468 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1469 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1470 mflowtype, mflowid, inp->fibnum, 1471 vrf_id, net->port); 1472 if (how_indx < sizeof(asoc->cookie_how)) 1473 asoc->cookie_how[how_indx] = 2; 1474 return (NULL); 1475 } 1476 /* 1477 * find and validate the INIT chunk in the cookie (peer's info) the 1478 * INIT should start after the cookie-echo header struct (chunk 1479 * header, state cookie header struct) 1480 */ 1481 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1482 1483 init_cp = (struct sctp_init_chunk *) 1484 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1485 (uint8_t *)&init_buf); 1486 if (init_cp == NULL) { 1487 /* could not pull a INIT chunk in cookie */ 1488 return (NULL); 1489 } 1490 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1491 return (NULL); 1492 } 1493 /* 1494 * find and validate the INIT-ACK chunk in the cookie (my info) the 1495 * INIT-ACK follows the INIT chunk 1496 */ 1497 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1498 initack_cp = (struct sctp_init_ack_chunk *) 1499 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1500 (uint8_t *)&initack_buf); 1501 if (initack_cp == NULL) { 1502 /* could not pull INIT-ACK chunk in cookie */ 1503 return (NULL); 1504 } 1505 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1506 return (NULL); 1507 } 1508 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1509 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1510 /* 1511 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1512 * to get into the OPEN state 1513 */ 1514 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1515 /*- 1516 * Opps, this means that we somehow generated two vtag's 1517 * the same. I.e. we did: 1518 * Us Peer 1519 * <---INIT(tag=a)------ 1520 * ----INIT-ACK(tag=t)--> 1521 * ----INIT(tag=t)------> *1 1522 * <---INIT-ACK(tag=a)--- 1523 * <----CE(tag=t)------------- *2 1524 * 1525 * At point *1 we should be generating a different 1526 * tag t'. Which means we would throw away the CE and send 1527 * ours instead. Basically this is case C (throw away side). 1528 */ 1529 if (how_indx < sizeof(asoc->cookie_how)) 1530 asoc->cookie_how[how_indx] = 17; 1531 return (NULL); 1532 1533 } 1534 switch (SCTP_GET_STATE(stcb)) { 1535 case SCTP_STATE_COOKIE_WAIT: 1536 case SCTP_STATE_COOKIE_ECHOED: 1537 /* 1538 * INIT was sent but got a COOKIE_ECHO with the 1539 * correct tags... just accept it...but we must 1540 * process the init so that we can make sure we have 1541 * the right seq no's. 1542 */ 1543 /* First we must process the INIT !! */ 1544 retval = sctp_process_init(init_cp, stcb); 1545 if (retval < 0) { 1546 if (how_indx < sizeof(asoc->cookie_how)) 1547 asoc->cookie_how[how_indx] = 3; 1548 return (NULL); 1549 } 1550 /* we have already processed the INIT so no problem */ 1551 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1552 stcb, net, 1553 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1554 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1555 stcb, net, 1556 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1557 /* update current state */ 1558 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1559 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1560 else 1561 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1562 1563 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1564 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1565 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1566 stcb->sctp_ep, stcb, NULL); 1567 } 1568 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1569 sctp_stop_all_cookie_timers(stcb); 1570 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1571 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1572 (!SCTP_IS_LISTENING(inp))) { 1573 /* 1574 * Here is where collision would go if we 1575 * did a connect() and instead got a 1576 * init/init-ack/cookie done before the 1577 * init-ack came back.. 1578 */ 1579 stcb->sctp_ep->sctp_flags |= 1580 SCTP_PCB_FLAGS_CONNECTED; 1581 soisconnected(stcb->sctp_socket); 1582 } 1583 /* notify upper layer */ 1584 *notification = SCTP_NOTIFY_ASSOC_UP; 1585 /* 1586 * since we did not send a HB make sure we don't 1587 * double things 1588 */ 1589 old.tv_sec = cookie->time_entered.tv_sec; 1590 old.tv_usec = cookie->time_entered.tv_usec; 1591 net->hb_responded = 1; 1592 sctp_calculate_rto(stcb, asoc, net, &old, 1593 SCTP_RTT_FROM_NON_DATA); 1594 1595 if (stcb->asoc.sctp_autoclose_ticks && 1596 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1597 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1598 inp, stcb, NULL); 1599 } 1600 break; 1601 default: 1602 /* 1603 * we're in the OPEN state (or beyond), so peer must 1604 * have simply lost the COOKIE-ACK 1605 */ 1606 break; 1607 } /* end switch */ 1608 sctp_stop_all_cookie_timers(stcb); 1609 /* 1610 * We ignore the return code here.. not sure if we should 1611 * somehow abort.. but we do have an existing asoc. This 1612 * really should not fail. 1613 */ 1614 if (sctp_load_addresses_from_init(stcb, m, 1615 init_offset + sizeof(struct sctp_init_chunk), 1616 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1617 if (how_indx < sizeof(asoc->cookie_how)) 1618 asoc->cookie_how[how_indx] = 4; 1619 return (NULL); 1620 } 1621 /* respond with a COOKIE-ACK */ 1622 sctp_toss_old_cookies(stcb, asoc); 1623 sctp_send_cookie_ack(stcb); 1624 if (how_indx < sizeof(asoc->cookie_how)) 1625 asoc->cookie_how[how_indx] = 5; 1626 return (stcb); 1627 } 1628 1629 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1630 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1631 cookie->tie_tag_my_vtag == 0 && 1632 cookie->tie_tag_peer_vtag == 0) { 1633 /* 1634 * case C in Section 5.2.4 Table 2: XMOO silently discard 1635 */ 1636 if (how_indx < sizeof(asoc->cookie_how)) 1637 asoc->cookie_how[how_indx] = 6; 1638 return (NULL); 1639 } 1640 /* 1641 * If nat support, and the below and stcb is established, send back 1642 * a ABORT(colliding state) if we are established. 1643 */ 1644 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1645 (asoc->peer_supports_nat) && 1646 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1647 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1648 (asoc->peer_vtag == 0)))) { 1649 /* 1650 * Special case - Peer's support nat. We may have two init's 1651 * that we gave out the same tag on since one was not 1652 * established.. i.e. we get INIT from host-1 behind the nat 1653 * and we respond tag-a, we get a INIT from host-2 behind 1654 * the nat and we get tag-a again. Then we bring up host-1 1655 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1656 * Now we have colliding state. We must send an abort here 1657 * with colliding state indication. 1658 */ 1659 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1660 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1661 mflowtype, mflowid, inp->fibnum, 1662 vrf_id, port); 1663 return (NULL); 1664 } 1665 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1666 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1667 (asoc->peer_vtag == 0))) { 1668 /* 1669 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1670 * should be ok, re-accept peer info 1671 */ 1672 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1673 /* 1674 * Extension of case C. If we hit this, then the 1675 * random number generator returned the same vtag 1676 * when we first sent our INIT-ACK and when we later 1677 * sent our INIT. The side with the seq numbers that 1678 * are different will be the one that normnally 1679 * would have hit case C. This in effect "extends" 1680 * our vtags in this collision case to be 64 bits. 1681 * The same collision could occur aka you get both 1682 * vtag and seq number the same twice in a row.. but 1683 * is much less likely. If it did happen then we 1684 * would proceed through and bring up the assoc.. we 1685 * may end up with the wrong stream setup however.. 1686 * which would be bad.. but there is no way to 1687 * tell.. until we send on a stream that does not 1688 * exist :-) 1689 */ 1690 if (how_indx < sizeof(asoc->cookie_how)) 1691 asoc->cookie_how[how_indx] = 7; 1692 1693 return (NULL); 1694 } 1695 if (how_indx < sizeof(asoc->cookie_how)) 1696 asoc->cookie_how[how_indx] = 8; 1697 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1698 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1699 sctp_stop_all_cookie_timers(stcb); 1700 /* 1701 * since we did not send a HB make sure we don't double 1702 * things 1703 */ 1704 net->hb_responded = 1; 1705 if (stcb->asoc.sctp_autoclose_ticks && 1706 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1707 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1708 NULL); 1709 } 1710 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1711 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1712 1713 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1714 /* 1715 * Ok the peer probably discarded our data (if we 1716 * echoed a cookie+data). So anything on the 1717 * sent_queue should be marked for retransmit, we 1718 * may not get something to kick us so it COULD 1719 * still take a timeout to move these.. but it can't 1720 * hurt to mark them. 1721 */ 1722 struct sctp_tmit_chunk *chk; 1723 1724 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1725 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1726 chk->sent = SCTP_DATAGRAM_RESEND; 1727 sctp_flight_size_decrease(chk); 1728 sctp_total_flight_decrease(stcb, chk); 1729 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1730 spec_flag++; 1731 } 1732 } 1733 1734 } 1735 /* process the INIT info (peer's info) */ 1736 retval = sctp_process_init(init_cp, stcb); 1737 if (retval < 0) { 1738 if (how_indx < sizeof(asoc->cookie_how)) 1739 asoc->cookie_how[how_indx] = 9; 1740 return (NULL); 1741 } 1742 if (sctp_load_addresses_from_init(stcb, m, 1743 init_offset + sizeof(struct sctp_init_chunk), 1744 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1745 if (how_indx < sizeof(asoc->cookie_how)) 1746 asoc->cookie_how[how_indx] = 10; 1747 return (NULL); 1748 } 1749 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1750 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1751 *notification = SCTP_NOTIFY_ASSOC_UP; 1752 1753 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1754 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1755 (!SCTP_IS_LISTENING(inp))) { 1756 stcb->sctp_ep->sctp_flags |= 1757 SCTP_PCB_FLAGS_CONNECTED; 1758 soisconnected(stcb->sctp_socket); 1759 } 1760 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1761 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1762 else 1763 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1764 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1765 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1766 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1767 } else { 1768 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1769 } 1770 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1771 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1772 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1773 stcb->sctp_ep, stcb, NULL); 1774 } 1775 sctp_stop_all_cookie_timers(stcb); 1776 sctp_toss_old_cookies(stcb, asoc); 1777 sctp_send_cookie_ack(stcb); 1778 if (spec_flag) { 1779 /* 1780 * only if we have retrans set do we do this. What 1781 * this call does is get only the COOKIE-ACK out and 1782 * then when we return the normal call to 1783 * sctp_chunk_output will get the retrans out behind 1784 * this. 1785 */ 1786 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1787 } 1788 if (how_indx < sizeof(asoc->cookie_how)) 1789 asoc->cookie_how[how_indx] = 11; 1790 1791 return (stcb); 1792 } 1793 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1794 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1795 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1796 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1797 cookie->tie_tag_peer_vtag != 0) { 1798 struct sctpasochead *head; 1799 1800 if (asoc->peer_supports_nat) { 1801 /* 1802 * This is a gross gross hack. Just call the 1803 * cookie_new code since we are allowing a duplicate 1804 * association. I hope this works... 1805 */ 1806 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1807 sh, cookie, cookie_len, 1808 inp, netp, init_src, notification, 1809 auth_skipped, auth_offset, auth_len, 1810 mflowtype, mflowid, 1811 vrf_id, port)); 1812 } 1813 /* 1814 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1815 */ 1816 /* temp code */ 1817 if (how_indx < sizeof(asoc->cookie_how)) 1818 asoc->cookie_how[how_indx] = 12; 1819 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1820 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1821 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1822 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1823 1824 /* notify upper layer */ 1825 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1826 atomic_add_int(&stcb->asoc.refcnt, 1); 1827 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1828 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1829 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1830 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1831 } 1832 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1833 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1834 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1835 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1836 } 1837 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1838 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1839 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1840 stcb->sctp_ep, stcb, NULL); 1841 1842 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1843 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1844 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1845 } 1846 asoc->pre_open_streams = 1847 ntohs(initack_cp->init.num_outbound_streams); 1848 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1849 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1850 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1851 1852 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1853 1854 asoc->str_reset_seq_in = asoc->init_seq_number; 1855 1856 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1857 if (asoc->mapping_array) { 1858 memset(asoc->mapping_array, 0, 1859 asoc->mapping_array_size); 1860 } 1861 if (asoc->nr_mapping_array) { 1862 memset(asoc->nr_mapping_array, 0, 1863 asoc->mapping_array_size); 1864 } 1865 SCTP_TCB_UNLOCK(stcb); 1866 SCTP_INP_INFO_WLOCK(); 1867 SCTP_INP_WLOCK(stcb->sctp_ep); 1868 SCTP_TCB_LOCK(stcb); 1869 atomic_add_int(&stcb->asoc.refcnt, -1); 1870 /* send up all the data */ 1871 SCTP_TCB_SEND_LOCK(stcb); 1872 1873 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1874 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1875 stcb->asoc.strmout[i].chunks_on_queues = 0; 1876 #if defined(SCTP_DETAILED_STR_STATS) 1877 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1878 asoc->strmout[i].abandoned_sent[j] = 0; 1879 asoc->strmout[i].abandoned_unsent[j] = 0; 1880 } 1881 #else 1882 asoc->strmout[i].abandoned_sent[0] = 0; 1883 asoc->strmout[i].abandoned_unsent[0] = 0; 1884 #endif 1885 stcb->asoc.strmout[i].sid = i; 1886 stcb->asoc.strmout[i].next_mid_ordered = 0; 1887 stcb->asoc.strmout[i].next_mid_unordered = 0; 1888 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1889 } 1890 /* process the INIT-ACK info (my info) */ 1891 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1892 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1893 1894 /* pull from vtag hash */ 1895 LIST_REMOVE(stcb, sctp_asocs); 1896 /* re-insert to new vtag position */ 1897 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1898 SCTP_BASE_INFO(hashasocmark))]; 1899 /* 1900 * put it in the bucket in the vtag hash of assoc's for the 1901 * system 1902 */ 1903 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1904 1905 SCTP_TCB_SEND_UNLOCK(stcb); 1906 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1907 SCTP_INP_INFO_WUNLOCK(); 1908 asoc->total_flight = 0; 1909 asoc->total_flight_count = 0; 1910 /* process the INIT info (peer's info) */ 1911 retval = sctp_process_init(init_cp, stcb); 1912 if (retval < 0) { 1913 if (how_indx < sizeof(asoc->cookie_how)) 1914 asoc->cookie_how[how_indx] = 13; 1915 1916 return (NULL); 1917 } 1918 /* 1919 * since we did not send a HB make sure we don't double 1920 * things 1921 */ 1922 net->hb_responded = 1; 1923 1924 if (sctp_load_addresses_from_init(stcb, m, 1925 init_offset + sizeof(struct sctp_init_chunk), 1926 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1927 if (how_indx < sizeof(asoc->cookie_how)) 1928 asoc->cookie_how[how_indx] = 14; 1929 1930 return (NULL); 1931 } 1932 /* respond with a COOKIE-ACK */ 1933 sctp_stop_all_cookie_timers(stcb); 1934 sctp_toss_old_cookies(stcb, asoc); 1935 sctp_send_cookie_ack(stcb); 1936 if (how_indx < sizeof(asoc->cookie_how)) 1937 asoc->cookie_how[how_indx] = 15; 1938 1939 return (stcb); 1940 } 1941 if (how_indx < sizeof(asoc->cookie_how)) 1942 asoc->cookie_how[how_indx] = 16; 1943 /* all other cases... */ 1944 return (NULL); 1945 } 1946 1947 1948 /* 1949 * handle a state cookie for a new association m: input packet mbuf chain-- 1950 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1951 * and the cookie signature does not exist offset: offset into mbuf to the 1952 * cookie-echo chunk length: length of the cookie chunk to: where the init 1953 * was from returns a new TCB 1954 */ 1955 static struct sctp_tcb * 1956 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1957 struct sockaddr *src, struct sockaddr *dst, 1958 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1959 struct sctp_inpcb *inp, struct sctp_nets **netp, 1960 struct sockaddr *init_src, int *notification, 1961 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1962 uint8_t mflowtype, uint32_t mflowid, 1963 uint32_t vrf_id, uint16_t port) 1964 { 1965 struct sctp_tcb *stcb; 1966 struct sctp_init_chunk *init_cp, init_buf; 1967 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1968 union sctp_sockstore store; 1969 struct sctp_association *asoc; 1970 int init_offset, initack_offset, initack_limit; 1971 int retval; 1972 int error = 0; 1973 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1974 1975 /* 1976 * find and validate the INIT chunk in the cookie (peer's info) the 1977 * INIT should start after the cookie-echo header struct (chunk 1978 * header, state cookie header struct) 1979 */ 1980 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1981 init_cp = (struct sctp_init_chunk *) 1982 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1983 (uint8_t *)&init_buf); 1984 if (init_cp == NULL) { 1985 /* could not pull a INIT chunk in cookie */ 1986 SCTPDBG(SCTP_DEBUG_INPUT1, 1987 "process_cookie_new: could not pull INIT chunk hdr\n"); 1988 return (NULL); 1989 } 1990 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1991 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1992 return (NULL); 1993 } 1994 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1995 /* 1996 * find and validate the INIT-ACK chunk in the cookie (my info) the 1997 * INIT-ACK follows the INIT chunk 1998 */ 1999 initack_cp = (struct sctp_init_ack_chunk *) 2000 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2001 (uint8_t *)&initack_buf); 2002 if (initack_cp == NULL) { 2003 /* could not pull INIT-ACK chunk in cookie */ 2004 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2005 return (NULL); 2006 } 2007 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2008 return (NULL); 2009 } 2010 /* 2011 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2012 * "initack_limit" value. This is because the chk_length field 2013 * includes the length of the cookie, but the cookie is omitted when 2014 * the INIT and INIT_ACK are tacked onto the cookie... 2015 */ 2016 initack_limit = offset + cookie_len; 2017 2018 /* 2019 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2020 * and popluate 2021 */ 2022 2023 /* 2024 * Here we do a trick, we set in NULL for the proc/thread argument. 2025 * We do this since in effect we only use the p argument when the 2026 * socket is unbound and we must do an implicit bind. Since we are 2027 * getting a cookie, we cannot be unbound. 2028 */ 2029 stcb = sctp_aloc_assoc(inp, init_src, &error, 2030 ntohl(initack_cp->init.initiate_tag), vrf_id, 2031 ntohs(initack_cp->init.num_outbound_streams), 2032 port, 2033 (struct thread *)NULL, 2034 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2035 if (stcb == NULL) { 2036 struct mbuf *op_err; 2037 2038 /* memory problem? */ 2039 SCTPDBG(SCTP_DEBUG_INPUT1, 2040 "process_cookie_new: no room for another TCB!\n"); 2041 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2042 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2043 src, dst, sh, op_err, 2044 mflowtype, mflowid, 2045 vrf_id, port); 2046 return (NULL); 2047 } 2048 /* get the correct sctp_nets */ 2049 if (netp) 2050 *netp = sctp_findnet(stcb, init_src); 2051 2052 asoc = &stcb->asoc; 2053 /* get scope variables out of cookie */ 2054 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2055 asoc->scope.site_scope = cookie->site_scope; 2056 asoc->scope.local_scope = cookie->local_scope; 2057 asoc->scope.loopback_scope = cookie->loopback_scope; 2058 2059 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2060 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2061 struct mbuf *op_err; 2062 2063 /* 2064 * Houston we have a problem. The EP changed while the 2065 * cookie was in flight. Only recourse is to abort the 2066 * association. 2067 */ 2068 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2069 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2070 src, dst, sh, op_err, 2071 mflowtype, mflowid, 2072 vrf_id, port); 2073 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2074 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2075 return (NULL); 2076 } 2077 /* process the INIT-ACK info (my info) */ 2078 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2079 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2080 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2081 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2082 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2083 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2084 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2085 asoc->str_reset_seq_in = asoc->init_seq_number; 2086 2087 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2088 2089 /* process the INIT info (peer's info) */ 2090 if (netp) 2091 retval = sctp_process_init(init_cp, stcb); 2092 else 2093 retval = 0; 2094 if (retval < 0) { 2095 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2096 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2097 return (NULL); 2098 } 2099 /* load all addresses */ 2100 if (sctp_load_addresses_from_init(stcb, m, 2101 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2102 src, dst, init_src, port)) { 2103 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2104 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2105 return (NULL); 2106 } 2107 /* 2108 * verify any preceding AUTH chunk that was skipped 2109 */ 2110 /* pull the local authentication parameters from the cookie/init-ack */ 2111 sctp_auth_get_cookie_params(stcb, m, 2112 initack_offset + sizeof(struct sctp_init_ack_chunk), 2113 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2114 if (auth_skipped) { 2115 struct sctp_auth_chunk *auth; 2116 2117 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2118 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2119 } else { 2120 auth = NULL; 2121 } 2122 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2123 /* auth HMAC failed, dump the assoc and packet */ 2124 SCTPDBG(SCTP_DEBUG_AUTH1, 2125 "COOKIE-ECHO: AUTH failed\n"); 2126 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2127 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2128 return (NULL); 2129 } else { 2130 /* remaining chunks checked... good to go */ 2131 stcb->asoc.authenticated = 1; 2132 } 2133 } 2134 2135 /* 2136 * if we're doing ASCONFs, check to see if we have any new local 2137 * addresses that need to get added to the peer (eg. addresses 2138 * changed while cookie echo in flight). This needs to be done 2139 * after we go to the OPEN state to do the correct asconf 2140 * processing. else, make sure we have the correct addresses in our 2141 * lists 2142 */ 2143 2144 /* warning, we re-use sin, sin6, sa_store here! */ 2145 /* pull in local_address (our "from" address) */ 2146 switch (cookie->laddr_type) { 2147 #ifdef INET 2148 case SCTP_IPV4_ADDRESS: 2149 /* source addr is IPv4 */ 2150 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2151 store.sin.sin_family = AF_INET; 2152 store.sin.sin_len = sizeof(struct sockaddr_in); 2153 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2154 break; 2155 #endif 2156 #ifdef INET6 2157 case SCTP_IPV6_ADDRESS: 2158 /* source addr is IPv6 */ 2159 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2160 store.sin6.sin6_family = AF_INET6; 2161 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2162 store.sin6.sin6_scope_id = cookie->scope_id; 2163 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2164 break; 2165 #endif 2166 default: 2167 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2168 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2169 return (NULL); 2170 } 2171 2172 /* update current state */ 2173 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2174 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2175 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2176 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2177 stcb->sctp_ep, stcb, NULL); 2178 } 2179 sctp_stop_all_cookie_timers(stcb); 2180 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2181 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2182 2183 /* set up to notify upper layer */ 2184 *notification = SCTP_NOTIFY_ASSOC_UP; 2185 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2186 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2187 (!SCTP_IS_LISTENING(inp))) { 2188 /* 2189 * This is an endpoint that called connect() how it got a 2190 * cookie that is NEW is a bit of a mystery. It must be that 2191 * the INIT was sent, but before it got there.. a complete 2192 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2193 * should have went to the other code.. not here.. oh well.. 2194 * a bit of protection is worth having.. 2195 */ 2196 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2197 soisconnected(stcb->sctp_socket); 2198 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2199 (SCTP_IS_LISTENING(inp))) { 2200 /* 2201 * We don't want to do anything with this one. Since it is 2202 * the listening guy. The timer will get started for 2203 * accepted connections in the caller. 2204 */ 2205 ; 2206 } 2207 /* since we did not send a HB make sure we don't double things */ 2208 if ((netp) && (*netp)) 2209 (*netp)->hb_responded = 1; 2210 2211 if (stcb->asoc.sctp_autoclose_ticks && 2212 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2213 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2214 } 2215 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2216 if ((netp != NULL) && (*netp != NULL)) { 2217 struct timeval old; 2218 2219 /* calculate the RTT and set the encaps port */ 2220 old.tv_sec = cookie->time_entered.tv_sec; 2221 old.tv_usec = cookie->time_entered.tv_usec; 2222 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2223 } 2224 /* respond with a COOKIE-ACK */ 2225 sctp_send_cookie_ack(stcb); 2226 2227 /* 2228 * check the address lists for any ASCONFs that need to be sent 2229 * AFTER the cookie-ack is sent 2230 */ 2231 sctp_check_address_list(stcb, m, 2232 initack_offset + sizeof(struct sctp_init_ack_chunk), 2233 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2234 &store.sa, cookie->local_scope, cookie->site_scope, 2235 cookie->ipv4_scope, cookie->loopback_scope); 2236 2237 2238 return (stcb); 2239 } 2240 2241 /* 2242 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2243 * we NEED to make sure we are not already using the vtag. If so we 2244 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2245 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2246 SCTP_BASE_INFO(hashasocmark))]; 2247 LIST_FOREACH(stcb, head, sctp_asocs) { 2248 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2249 -- SEND ABORT - TRY AGAIN -- 2250 } 2251 } 2252 */ 2253 2254 /* 2255 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2256 * existing (non-NULL) TCB 2257 */ 2258 static struct mbuf * 2259 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2260 struct sockaddr *src, struct sockaddr *dst, 2261 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2262 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2263 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2264 struct sctp_tcb **locked_tcb, 2265 uint8_t mflowtype, uint32_t mflowid, 2266 uint32_t vrf_id, uint16_t port) 2267 { 2268 struct sctp_state_cookie *cookie; 2269 struct sctp_tcb *l_stcb = *stcb; 2270 struct sctp_inpcb *l_inp; 2271 struct sockaddr *to; 2272 struct sctp_pcb *ep; 2273 struct mbuf *m_sig; 2274 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2275 uint8_t *sig; 2276 uint8_t cookie_ok = 0; 2277 unsigned int sig_offset, cookie_offset; 2278 unsigned int cookie_len; 2279 struct timeval now; 2280 struct timeval time_expires; 2281 int notification = 0; 2282 struct sctp_nets *netl; 2283 int had_a_existing_tcb = 0; 2284 int send_int_conf = 0; 2285 #ifdef INET 2286 struct sockaddr_in sin; 2287 #endif 2288 #ifdef INET6 2289 struct sockaddr_in6 sin6; 2290 #endif 2291 2292 SCTPDBG(SCTP_DEBUG_INPUT2, 2293 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2294 2295 if (inp_p == NULL) { 2296 return (NULL); 2297 } 2298 cookie = &cp->cookie; 2299 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2300 cookie_len = ntohs(cp->ch.chunk_length); 2301 2302 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2303 sizeof(struct sctp_init_chunk) + 2304 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2305 /* cookie too small */ 2306 return (NULL); 2307 } 2308 if ((cookie->peerport != sh->src_port) || 2309 (cookie->myport != sh->dest_port) || 2310 (cookie->my_vtag != sh->v_tag)) { 2311 /* 2312 * invalid ports or bad tag. Note that we always leave the 2313 * v_tag in the header in network order and when we stored 2314 * it in the my_vtag slot we also left it in network order. 2315 * This maintains the match even though it may be in the 2316 * opposite byte order of the machine :-> 2317 */ 2318 return (NULL); 2319 } 2320 /* 2321 * split off the signature into its own mbuf (since it should not be 2322 * calculated in the sctp_hmac_m() call). 2323 */ 2324 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2325 m_sig = m_split(m, sig_offset, M_NOWAIT); 2326 if (m_sig == NULL) { 2327 /* out of memory or ?? */ 2328 return (NULL); 2329 } 2330 #ifdef SCTP_MBUF_LOGGING 2331 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2332 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2333 } 2334 #endif 2335 2336 /* 2337 * compute the signature/digest for the cookie 2338 */ 2339 ep = &(*inp_p)->sctp_ep; 2340 l_inp = *inp_p; 2341 if (l_stcb) { 2342 SCTP_TCB_UNLOCK(l_stcb); 2343 } 2344 SCTP_INP_RLOCK(l_inp); 2345 if (l_stcb) { 2346 SCTP_TCB_LOCK(l_stcb); 2347 } 2348 /* which cookie is it? */ 2349 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2350 (ep->current_secret_number != ep->last_secret_number)) { 2351 /* it's the old cookie */ 2352 (void)sctp_hmac_m(SCTP_HMAC, 2353 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2354 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2355 } else { 2356 /* it's the current cookie */ 2357 (void)sctp_hmac_m(SCTP_HMAC, 2358 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2359 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2360 } 2361 /* get the signature */ 2362 SCTP_INP_RUNLOCK(l_inp); 2363 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2364 if (sig == NULL) { 2365 /* couldn't find signature */ 2366 sctp_m_freem(m_sig); 2367 return (NULL); 2368 } 2369 /* compare the received digest with the computed digest */ 2370 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2371 /* try the old cookie? */ 2372 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2373 (ep->current_secret_number != ep->last_secret_number)) { 2374 /* compute digest with old */ 2375 (void)sctp_hmac_m(SCTP_HMAC, 2376 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2377 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2378 /* compare */ 2379 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2380 cookie_ok = 1; 2381 } 2382 } else { 2383 cookie_ok = 1; 2384 } 2385 2386 /* 2387 * Now before we continue we must reconstruct our mbuf so that 2388 * normal processing of any other chunks will work. 2389 */ 2390 { 2391 struct mbuf *m_at; 2392 2393 m_at = m; 2394 while (SCTP_BUF_NEXT(m_at) != NULL) { 2395 m_at = SCTP_BUF_NEXT(m_at); 2396 } 2397 SCTP_BUF_NEXT(m_at) = m_sig; 2398 } 2399 2400 if (cookie_ok == 0) { 2401 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2402 SCTPDBG(SCTP_DEBUG_INPUT2, 2403 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2404 (uint32_t)offset, cookie_offset, sig_offset); 2405 return (NULL); 2406 } 2407 2408 /* 2409 * check the cookie timestamps to be sure it's not stale 2410 */ 2411 (void)SCTP_GETTIME_TIMEVAL(&now); 2412 /* Expire time is in Ticks, so we convert to seconds */ 2413 time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2414 time_expires.tv_usec = cookie->time_entered.tv_usec; 2415 if (timevalcmp(&now, &time_expires, >)) { 2416 /* cookie is stale! */ 2417 struct mbuf *op_err; 2418 struct sctp_error_stale_cookie *cause; 2419 struct timeval diff; 2420 uint32_t staleness; 2421 2422 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2423 0, M_NOWAIT, 1, MT_DATA); 2424 if (op_err == NULL) { 2425 /* FOOBAR */ 2426 return (NULL); 2427 } 2428 /* Set the len */ 2429 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2430 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2431 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2432 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2433 (sizeof(uint32_t)))); 2434 diff = now; 2435 timevalsub(&diff, &time_expires); 2436 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2437 staleness = UINT32_MAX; 2438 } else { 2439 staleness = diff.tv_sec * 1000000; 2440 } 2441 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2442 staleness += diff.tv_usec; 2443 } else { 2444 staleness = UINT32_MAX; 2445 } 2446 cause->stale_time = htonl(staleness); 2447 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2448 mflowtype, mflowid, l_inp->fibnum, 2449 vrf_id, port); 2450 return (NULL); 2451 } 2452 /* 2453 * Now we must see with the lookup address if we have an existing 2454 * asoc. This will only happen if we were in the COOKIE-WAIT state 2455 * and a INIT collided with us and somewhere the peer sent the 2456 * cookie on another address besides the single address our assoc 2457 * had for him. In this case we will have one of the tie-tags set at 2458 * least AND the address field in the cookie can be used to look it 2459 * up. 2460 */ 2461 to = NULL; 2462 switch (cookie->addr_type) { 2463 #ifdef INET6 2464 case SCTP_IPV6_ADDRESS: 2465 memset(&sin6, 0, sizeof(sin6)); 2466 sin6.sin6_family = AF_INET6; 2467 sin6.sin6_len = sizeof(sin6); 2468 sin6.sin6_port = sh->src_port; 2469 sin6.sin6_scope_id = cookie->scope_id; 2470 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2471 sizeof(sin6.sin6_addr.s6_addr)); 2472 to = (struct sockaddr *)&sin6; 2473 break; 2474 #endif 2475 #ifdef INET 2476 case SCTP_IPV4_ADDRESS: 2477 memset(&sin, 0, sizeof(sin)); 2478 sin.sin_family = AF_INET; 2479 sin.sin_len = sizeof(sin); 2480 sin.sin_port = sh->src_port; 2481 sin.sin_addr.s_addr = cookie->address[0]; 2482 to = (struct sockaddr *)&sin; 2483 break; 2484 #endif 2485 default: 2486 /* This should not happen */ 2487 return (NULL); 2488 } 2489 if (*stcb == NULL) { 2490 /* Yep, lets check */ 2491 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2492 if (*stcb == NULL) { 2493 /* 2494 * We should have only got back the same inp. If we 2495 * got back a different ep we have a problem. The 2496 * original findep got back l_inp and now 2497 */ 2498 if (l_inp != *inp_p) { 2499 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2500 } 2501 } else { 2502 if (*locked_tcb == NULL) { 2503 /* 2504 * In this case we found the assoc only 2505 * after we locked the create lock. This 2506 * means we are in a colliding case and we 2507 * must make sure that we unlock the tcb if 2508 * its one of the cases where we throw away 2509 * the incoming packets. 2510 */ 2511 *locked_tcb = *stcb; 2512 2513 /* 2514 * We must also increment the inp ref count 2515 * since the ref_count flags was set when we 2516 * did not find the TCB, now we found it 2517 * which reduces the refcount.. we must 2518 * raise it back out to balance it all :-) 2519 */ 2520 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2521 if ((*stcb)->sctp_ep != l_inp) { 2522 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2523 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2524 } 2525 } 2526 } 2527 } 2528 2529 cookie_len -= SCTP_SIGNATURE_SIZE; 2530 if (*stcb == NULL) { 2531 /* this is the "normal" case... get a new TCB */ 2532 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2533 cookie, cookie_len, *inp_p, 2534 netp, to, ¬ification, 2535 auth_skipped, auth_offset, auth_len, 2536 mflowtype, mflowid, 2537 vrf_id, port); 2538 } else { 2539 /* this is abnormal... cookie-echo on existing TCB */ 2540 had_a_existing_tcb = 1; 2541 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2542 src, dst, sh, 2543 cookie, cookie_len, *inp_p, *stcb, netp, to, 2544 ¬ification, auth_skipped, auth_offset, auth_len, 2545 mflowtype, mflowid, 2546 vrf_id, port); 2547 } 2548 2549 if (*stcb == NULL) { 2550 /* still no TCB... must be bad cookie-echo */ 2551 return (NULL); 2552 } 2553 if (*netp != NULL) { 2554 (*netp)->flowtype = mflowtype; 2555 (*netp)->flowid = mflowid; 2556 } 2557 /* 2558 * Ok, we built an association so confirm the address we sent the 2559 * INIT-ACK to. 2560 */ 2561 netl = sctp_findnet(*stcb, to); 2562 /* 2563 * This code should in theory NOT run but 2564 */ 2565 if (netl == NULL) { 2566 /* TSNH! Huh, why do I need to add this address here? */ 2567 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2568 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2569 return (NULL); 2570 } 2571 netl = sctp_findnet(*stcb, to); 2572 } 2573 if (netl) { 2574 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2575 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2576 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2577 netl); 2578 send_int_conf = 1; 2579 } 2580 } 2581 sctp_start_net_timers(*stcb); 2582 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2583 if (!had_a_existing_tcb || 2584 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2585 /* 2586 * If we have a NEW cookie or the connect never 2587 * reached the connected state during collision we 2588 * must do the TCP accept thing. 2589 */ 2590 struct socket *so, *oso; 2591 struct sctp_inpcb *inp; 2592 2593 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2594 /* 2595 * For a restart we will keep the same 2596 * socket, no need to do anything. I THINK!! 2597 */ 2598 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2599 if (send_int_conf) { 2600 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2601 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2602 } 2603 return (m); 2604 } 2605 oso = (*inp_p)->sctp_socket; 2606 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2607 SCTP_TCB_UNLOCK((*stcb)); 2608 CURVNET_SET(oso->so_vnet); 2609 so = sonewconn(oso, 0 2610 ); 2611 CURVNET_RESTORE(); 2612 SCTP_TCB_LOCK((*stcb)); 2613 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2614 2615 if (so == NULL) { 2616 struct mbuf *op_err; 2617 2618 /* Too many sockets */ 2619 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2620 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2621 sctp_abort_association(*inp_p, NULL, m, iphlen, 2622 src, dst, sh, op_err, 2623 mflowtype, mflowid, 2624 vrf_id, port); 2625 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2626 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2627 return (NULL); 2628 } 2629 inp = (struct sctp_inpcb *)so->so_pcb; 2630 SCTP_INP_INCR_REF(inp); 2631 /* 2632 * We add the unbound flag here so that if we get an 2633 * soabort() before we get the move_pcb done, we 2634 * will properly cleanup. 2635 */ 2636 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2637 SCTP_PCB_FLAGS_CONNECTED | 2638 SCTP_PCB_FLAGS_IN_TCPPOOL | 2639 SCTP_PCB_FLAGS_UNBOUND | 2640 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2641 SCTP_PCB_FLAGS_DONT_WAKE); 2642 inp->sctp_features = (*inp_p)->sctp_features; 2643 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2644 inp->sctp_socket = so; 2645 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2646 inp->max_cwnd = (*inp_p)->max_cwnd; 2647 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2648 inp->ecn_supported = (*inp_p)->ecn_supported; 2649 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2650 inp->auth_supported = (*inp_p)->auth_supported; 2651 inp->asconf_supported = (*inp_p)->asconf_supported; 2652 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2653 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2654 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2655 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2656 inp->sctp_context = (*inp_p)->sctp_context; 2657 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2658 inp->fibnum = (*inp_p)->fibnum; 2659 inp->inp_starting_point_for_iterator = NULL; 2660 /* 2661 * copy in the authentication parameters from the 2662 * original endpoint 2663 */ 2664 if (inp->sctp_ep.local_hmacs) 2665 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2666 inp->sctp_ep.local_hmacs = 2667 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2668 if (inp->sctp_ep.local_auth_chunks) 2669 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2670 inp->sctp_ep.local_auth_chunks = 2671 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2672 2673 /* 2674 * Now we must move it from one hash table to 2675 * another and get the tcb in the right place. 2676 */ 2677 2678 /* 2679 * This is where the one-2-one socket is put into 2680 * the accept state waiting for the accept! 2681 */ 2682 if (*stcb) { 2683 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2684 } 2685 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2686 2687 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2688 SCTP_TCB_UNLOCK((*stcb)); 2689 2690 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2691 0); 2692 SCTP_TCB_LOCK((*stcb)); 2693 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2694 2695 2696 /* 2697 * now we must check to see if we were aborted while 2698 * the move was going on and the lock/unlock 2699 * happened. 2700 */ 2701 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2702 /* 2703 * yep it was, we leave the assoc attached 2704 * to the socket since the sctp_inpcb_free() 2705 * call will send an abort for us. 2706 */ 2707 SCTP_INP_DECR_REF(inp); 2708 return (NULL); 2709 } 2710 SCTP_INP_DECR_REF(inp); 2711 /* Switch over to the new guy */ 2712 *inp_p = inp; 2713 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2714 if (send_int_conf) { 2715 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2716 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2717 } 2718 2719 /* 2720 * Pull it from the incomplete queue and wake the 2721 * guy 2722 */ 2723 soisconnected(so); 2724 return (m); 2725 } 2726 } 2727 if (notification) { 2728 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2729 } 2730 if (send_int_conf) { 2731 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2732 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2733 } 2734 return (m); 2735 } 2736 2737 static void 2738 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2739 struct sctp_tcb *stcb, struct sctp_nets *net) 2740 { 2741 /* cp must not be used, others call this without a c-ack :-) */ 2742 struct sctp_association *asoc; 2743 struct sctp_tmit_chunk *chk; 2744 2745 SCTPDBG(SCTP_DEBUG_INPUT2, 2746 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2747 if ((stcb == NULL) || (net == NULL)) { 2748 return; 2749 } 2750 2751 asoc = &stcb->asoc; 2752 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2753 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2754 asoc->overall_error_count, 2755 0, 2756 SCTP_FROM_SCTP_INPUT, 2757 __LINE__); 2758 } 2759 asoc->overall_error_count = 0; 2760 sctp_stop_all_cookie_timers(stcb); 2761 /* process according to association state */ 2762 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2763 /* state change only needed when I am in right state */ 2764 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2765 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2766 sctp_start_net_timers(stcb); 2767 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2768 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2769 stcb->sctp_ep, stcb, NULL); 2770 2771 } 2772 /* update RTO */ 2773 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2774 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2775 if (asoc->overall_error_count == 0) { 2776 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2777 SCTP_RTT_FROM_NON_DATA); 2778 } 2779 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2780 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2781 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2782 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2783 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2784 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2785 soisconnected(stcb->sctp_socket); 2786 } 2787 } 2788 /* 2789 * since we did not send a HB make sure we don't double 2790 * things 2791 */ 2792 net->hb_responded = 1; 2793 2794 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2795 /* 2796 * We don't need to do the asconf thing, nor hb or 2797 * autoclose if the socket is closed. 2798 */ 2799 goto closed_socket; 2800 } 2801 2802 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2803 stcb, net); 2804 2805 2806 if (stcb->asoc.sctp_autoclose_ticks && 2807 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2808 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2809 stcb->sctp_ep, stcb, NULL); 2810 } 2811 /* 2812 * send ASCONF if parameters are pending and ASCONFs are 2813 * allowed (eg. addresses changed when init/cookie echo were 2814 * in flight) 2815 */ 2816 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2817 (stcb->asoc.asconf_supported == 1) && 2818 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2819 #ifdef SCTP_TIMER_BASED_ASCONF 2820 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2821 stcb->sctp_ep, stcb, 2822 stcb->asoc.primary_destination); 2823 #else 2824 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2825 SCTP_ADDR_NOT_LOCKED); 2826 #endif 2827 } 2828 } 2829 closed_socket: 2830 /* Toss the cookie if I can */ 2831 sctp_toss_old_cookies(stcb, asoc); 2832 /* Restart the timer if we have pending data */ 2833 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2834 if (chk->whoTo != NULL) { 2835 break; 2836 } 2837 } 2838 if (chk != NULL) { 2839 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2840 } 2841 } 2842 2843 static void 2844 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2845 struct sctp_tcb *stcb) 2846 { 2847 struct sctp_nets *net; 2848 struct sctp_tmit_chunk *lchk; 2849 struct sctp_ecne_chunk bkup; 2850 uint8_t override_bit; 2851 uint32_t tsn, window_data_tsn; 2852 int len; 2853 unsigned int pkt_cnt; 2854 2855 len = ntohs(cp->ch.chunk_length); 2856 if ((len != sizeof(struct sctp_ecne_chunk)) && 2857 (len != sizeof(struct old_sctp_ecne_chunk))) { 2858 return; 2859 } 2860 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2861 /* Its the old format */ 2862 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2863 bkup.num_pkts_since_cwr = htonl(1); 2864 cp = &bkup; 2865 } 2866 SCTP_STAT_INCR(sctps_recvecne); 2867 tsn = ntohl(cp->tsn); 2868 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2869 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2870 if (lchk == NULL) { 2871 window_data_tsn = stcb->asoc.sending_seq - 1; 2872 } else { 2873 window_data_tsn = lchk->rec.data.tsn; 2874 } 2875 2876 /* Find where it was sent to if possible. */ 2877 net = NULL; 2878 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2879 if (lchk->rec.data.tsn == tsn) { 2880 net = lchk->whoTo; 2881 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2882 break; 2883 } 2884 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2885 break; 2886 } 2887 } 2888 if (net == NULL) { 2889 /* 2890 * What to do. A previous send of a CWR was possibly lost. 2891 * See how old it is, we may have it marked on the actual 2892 * net. 2893 */ 2894 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2895 if (tsn == net->last_cwr_tsn) { 2896 /* Found him, send it off */ 2897 break; 2898 } 2899 } 2900 if (net == NULL) { 2901 /* 2902 * If we reach here, we need to send a special CWR 2903 * that says hey, we did this a long time ago and 2904 * you lost the response. 2905 */ 2906 net = TAILQ_FIRST(&stcb->asoc.nets); 2907 if (net == NULL) { 2908 /* TSNH */ 2909 return; 2910 } 2911 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2912 } else { 2913 override_bit = 0; 2914 } 2915 } else { 2916 override_bit = 0; 2917 } 2918 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2919 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2920 /* 2921 * JRS - Use the congestion control given in the pluggable 2922 * CC module 2923 */ 2924 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2925 /* 2926 * We reduce once every RTT. So we will only lower cwnd at 2927 * the next sending seq i.e. the window_data_tsn 2928 */ 2929 net->cwr_window_tsn = window_data_tsn; 2930 net->ecn_ce_pkt_cnt += pkt_cnt; 2931 net->lost_cnt = pkt_cnt; 2932 net->last_cwr_tsn = tsn; 2933 } else { 2934 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2935 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2936 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2937 /* 2938 * Another loss in the same window update how many 2939 * marks/packets lost we have had. 2940 */ 2941 int cnt = 1; 2942 2943 if (pkt_cnt > net->lost_cnt) { 2944 /* Should be the case */ 2945 cnt = (pkt_cnt - net->lost_cnt); 2946 net->ecn_ce_pkt_cnt += cnt; 2947 } 2948 net->lost_cnt = pkt_cnt; 2949 net->last_cwr_tsn = tsn; 2950 /* 2951 * Most CC functions will ignore this call, since we 2952 * are in-window yet of the initial CE the peer saw. 2953 */ 2954 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2955 } 2956 } 2957 /* 2958 * We always send a CWR this way if our previous one was lost our 2959 * peer will get an update, or if it is not time again to reduce we 2960 * still get the cwr to the peer. Note we set the override when we 2961 * could not find the TSN on the chunk or the destination network. 2962 */ 2963 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2964 } 2965 2966 static void 2967 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2968 { 2969 /* 2970 * Here we get a CWR from the peer. We must look in the outqueue and 2971 * make sure that we have a covered ECNE in the control chunk part. 2972 * If so remove it. 2973 */ 2974 struct sctp_tmit_chunk *chk, *nchk; 2975 struct sctp_ecne_chunk *ecne; 2976 int override; 2977 uint32_t cwr_tsn; 2978 2979 cwr_tsn = ntohl(cp->tsn); 2980 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2981 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2982 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2983 continue; 2984 } 2985 if ((override == 0) && (chk->whoTo != net)) { 2986 /* Must be from the right src unless override is set */ 2987 continue; 2988 } 2989 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2990 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2991 /* this covers this ECNE, we can remove it */ 2992 stcb->asoc.ecn_echo_cnt_onq--; 2993 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2994 sctp_next); 2995 stcb->asoc.ctrl_queue_cnt--; 2996 sctp_m_freem(chk->data); 2997 chk->data = NULL; 2998 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 2999 if (override == 0) { 3000 break; 3001 } 3002 } 3003 } 3004 } 3005 3006 static void 3007 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3008 struct sctp_tcb *stcb, struct sctp_nets *net) 3009 { 3010 3011 SCTPDBG(SCTP_DEBUG_INPUT2, 3012 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3013 if (stcb == NULL) 3014 return; 3015 3016 /* process according to association state */ 3017 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3018 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3019 SCTPDBG(SCTP_DEBUG_INPUT2, 3020 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3021 SCTP_TCB_UNLOCK(stcb); 3022 return; 3023 } 3024 /* notify upper layer protocol */ 3025 if (stcb->sctp_socket) { 3026 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3027 } 3028 #ifdef INVARIANTS 3029 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3030 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3031 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3032 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3033 } 3034 #endif 3035 /* stop the timer */ 3036 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3037 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3038 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3039 /* free the TCB */ 3040 SCTPDBG(SCTP_DEBUG_INPUT2, 3041 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3042 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3043 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3044 return; 3045 } 3046 3047 static int 3048 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3049 struct sctp_nets *net, uint8_t flg) 3050 { 3051 switch (desc->chunk_type) { 3052 case SCTP_DATA: 3053 /* find the tsn to resend (possibly */ 3054 { 3055 uint32_t tsn; 3056 struct sctp_tmit_chunk *tp1; 3057 3058 tsn = ntohl(desc->tsn_ifany); 3059 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3060 if (tp1->rec.data.tsn == tsn) { 3061 /* found it */ 3062 break; 3063 } 3064 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3065 /* not found */ 3066 tp1 = NULL; 3067 break; 3068 } 3069 } 3070 if (tp1 == NULL) { 3071 /* 3072 * Do it the other way , aka without paying 3073 * attention to queue seq order. 3074 */ 3075 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3076 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3077 if (tp1->rec.data.tsn == tsn) { 3078 /* found it */ 3079 break; 3080 } 3081 } 3082 } 3083 if (tp1 == NULL) { 3084 SCTP_STAT_INCR(sctps_pdrptsnnf); 3085 } 3086 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3087 uint8_t *ddp; 3088 3089 if (((flg & SCTP_BADCRC) == 0) && 3090 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3091 return (0); 3092 } 3093 if ((stcb->asoc.peers_rwnd == 0) && 3094 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3095 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3096 return (0); 3097 } 3098 if (stcb->asoc.peers_rwnd == 0 && 3099 (flg & SCTP_FROM_MIDDLE_BOX)) { 3100 SCTP_STAT_INCR(sctps_pdrpdizrw); 3101 return (0); 3102 } 3103 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3104 sizeof(struct sctp_data_chunk)); 3105 { 3106 unsigned int iii; 3107 3108 for (iii = 0; iii < sizeof(desc->data_bytes); 3109 iii++) { 3110 if (ddp[iii] != desc->data_bytes[iii]) { 3111 SCTP_STAT_INCR(sctps_pdrpbadd); 3112 return (-1); 3113 } 3114 } 3115 } 3116 3117 if (tp1->do_rtt) { 3118 /* 3119 * this guy had a RTO calculation 3120 * pending on it, cancel it 3121 */ 3122 if (tp1->whoTo->rto_needed == 0) { 3123 tp1->whoTo->rto_needed = 1; 3124 } 3125 tp1->do_rtt = 0; 3126 } 3127 SCTP_STAT_INCR(sctps_pdrpmark); 3128 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3129 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3130 /* 3131 * mark it as if we were doing a FR, since 3132 * we will be getting gap ack reports behind 3133 * the info from the router. 3134 */ 3135 tp1->rec.data.doing_fast_retransmit = 1; 3136 /* 3137 * mark the tsn with what sequences can 3138 * cause a new FR. 3139 */ 3140 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3141 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3142 } else { 3143 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3144 } 3145 3146 /* restart the timer */ 3147 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3148 stcb, tp1->whoTo, 3149 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3150 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3151 stcb, tp1->whoTo); 3152 3153 /* fix counts and things */ 3154 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3155 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3156 tp1->whoTo->flight_size, 3157 tp1->book_size, 3158 (uint32_t)(uintptr_t)stcb, 3159 tp1->rec.data.tsn); 3160 } 3161 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3162 sctp_flight_size_decrease(tp1); 3163 sctp_total_flight_decrease(stcb, tp1); 3164 } 3165 tp1->sent = SCTP_DATAGRAM_RESEND; 3166 } { 3167 /* audit code */ 3168 unsigned int audit; 3169 3170 audit = 0; 3171 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3172 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3173 audit++; 3174 } 3175 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3176 sctp_next) { 3177 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3178 audit++; 3179 } 3180 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3181 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3182 audit, stcb->asoc.sent_queue_retran_cnt); 3183 #ifndef SCTP_AUDITING_ENABLED 3184 stcb->asoc.sent_queue_retran_cnt = audit; 3185 #endif 3186 } 3187 } 3188 } 3189 break; 3190 case SCTP_ASCONF: 3191 { 3192 struct sctp_tmit_chunk *asconf; 3193 3194 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3195 sctp_next) { 3196 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3197 break; 3198 } 3199 } 3200 if (asconf) { 3201 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3202 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3203 asconf->sent = SCTP_DATAGRAM_RESEND; 3204 asconf->snd_count--; 3205 } 3206 } 3207 break; 3208 case SCTP_INITIATION: 3209 /* resend the INIT */ 3210 stcb->asoc.dropped_special_cnt++; 3211 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3212 /* 3213 * If we can get it in, in a few attempts we do 3214 * this, otherwise we let the timer fire. 3215 */ 3216 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3217 stcb, net, 3218 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3219 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3220 } 3221 break; 3222 case SCTP_SELECTIVE_ACK: 3223 case SCTP_NR_SELECTIVE_ACK: 3224 /* resend the sack */ 3225 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3226 break; 3227 case SCTP_HEARTBEAT_REQUEST: 3228 /* resend a demand HB */ 3229 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3230 /* 3231 * Only retransmit if we KNOW we wont destroy the 3232 * tcb 3233 */ 3234 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3235 } 3236 break; 3237 case SCTP_SHUTDOWN: 3238 sctp_send_shutdown(stcb, net); 3239 break; 3240 case SCTP_SHUTDOWN_ACK: 3241 sctp_send_shutdown_ack(stcb, net); 3242 break; 3243 case SCTP_COOKIE_ECHO: 3244 { 3245 struct sctp_tmit_chunk *cookie; 3246 3247 cookie = NULL; 3248 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3249 sctp_next) { 3250 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3251 break; 3252 } 3253 } 3254 if (cookie) { 3255 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3256 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3257 cookie->sent = SCTP_DATAGRAM_RESEND; 3258 sctp_stop_all_cookie_timers(stcb); 3259 } 3260 } 3261 break; 3262 case SCTP_COOKIE_ACK: 3263 sctp_send_cookie_ack(stcb); 3264 break; 3265 case SCTP_ASCONF_ACK: 3266 /* resend last asconf ack */ 3267 sctp_send_asconf_ack(stcb); 3268 break; 3269 case SCTP_IFORWARD_CUM_TSN: 3270 case SCTP_FORWARD_CUM_TSN: 3271 send_forward_tsn(stcb, &stcb->asoc); 3272 break; 3273 /* can't do anything with these */ 3274 case SCTP_PACKET_DROPPED: 3275 case SCTP_INITIATION_ACK: /* this should not happen */ 3276 case SCTP_HEARTBEAT_ACK: 3277 case SCTP_ABORT_ASSOCIATION: 3278 case SCTP_OPERATION_ERROR: 3279 case SCTP_SHUTDOWN_COMPLETE: 3280 case SCTP_ECN_ECHO: 3281 case SCTP_ECN_CWR: 3282 default: 3283 break; 3284 } 3285 return (0); 3286 } 3287 3288 void 3289 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3290 { 3291 uint32_t i; 3292 uint16_t temp; 3293 3294 /* 3295 * We set things to 0xffffffff since this is the last delivered 3296 * sequence and we will be sending in 0 after the reset. 3297 */ 3298 3299 if (number_entries) { 3300 for (i = 0; i < number_entries; i++) { 3301 temp = ntohs(list[i]); 3302 if (temp >= stcb->asoc.streamincnt) { 3303 continue; 3304 } 3305 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3306 } 3307 } else { 3308 list = NULL; 3309 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3310 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3311 } 3312 } 3313 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3314 } 3315 3316 static void 3317 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3318 { 3319 uint32_t i; 3320 uint16_t temp; 3321 3322 if (number_entries > 0) { 3323 for (i = 0; i < number_entries; i++) { 3324 temp = ntohs(list[i]); 3325 if (temp >= stcb->asoc.streamoutcnt) { 3326 /* no such stream */ 3327 continue; 3328 } 3329 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3330 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3331 } 3332 } else { 3333 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3334 stcb->asoc.strmout[i].next_mid_ordered = 0; 3335 stcb->asoc.strmout[i].next_mid_unordered = 0; 3336 } 3337 } 3338 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3339 } 3340 3341 static void 3342 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3343 { 3344 uint32_t i; 3345 uint16_t temp; 3346 3347 if (number_entries > 0) { 3348 for (i = 0; i < number_entries; i++) { 3349 temp = ntohs(list[i]); 3350 if (temp >= stcb->asoc.streamoutcnt) { 3351 /* no such stream */ 3352 continue; 3353 } 3354 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3355 } 3356 } else { 3357 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3358 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3359 } 3360 } 3361 } 3362 3363 3364 struct sctp_stream_reset_request * 3365 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3366 { 3367 struct sctp_association *asoc; 3368 struct sctp_chunkhdr *ch; 3369 struct sctp_stream_reset_request *r; 3370 struct sctp_tmit_chunk *chk; 3371 int len, clen; 3372 3373 asoc = &stcb->asoc; 3374 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3375 asoc->stream_reset_outstanding = 0; 3376 return (NULL); 3377 } 3378 if (stcb->asoc.str_reset == NULL) { 3379 asoc->stream_reset_outstanding = 0; 3380 return (NULL); 3381 } 3382 chk = stcb->asoc.str_reset; 3383 if (chk->data == NULL) { 3384 return (NULL); 3385 } 3386 if (bchk) { 3387 /* he wants a copy of the chk pointer */ 3388 *bchk = chk; 3389 } 3390 clen = chk->send_size; 3391 ch = mtod(chk->data, struct sctp_chunkhdr *); 3392 r = (struct sctp_stream_reset_request *)(ch + 1); 3393 if (ntohl(r->request_seq) == seq) { 3394 /* found it */ 3395 return (r); 3396 } 3397 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3398 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3399 /* move to the next one, there can only be a max of two */ 3400 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3401 if (ntohl(r->request_seq) == seq) { 3402 return (r); 3403 } 3404 } 3405 /* that seq is not here */ 3406 return (NULL); 3407 } 3408 3409 static void 3410 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3411 { 3412 struct sctp_association *asoc; 3413 struct sctp_tmit_chunk *chk; 3414 3415 asoc = &stcb->asoc; 3416 chk = asoc->str_reset; 3417 if (chk == NULL) { 3418 return; 3419 } 3420 asoc->str_reset = NULL; 3421 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3422 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3423 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3424 asoc->ctrl_queue_cnt--; 3425 if (chk->data) { 3426 sctp_m_freem(chk->data); 3427 chk->data = NULL; 3428 } 3429 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3430 } 3431 3432 3433 static int 3434 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3435 uint32_t seq, uint32_t action, 3436 struct sctp_stream_reset_response *respin) 3437 { 3438 uint16_t type; 3439 int lparam_len; 3440 struct sctp_association *asoc = &stcb->asoc; 3441 struct sctp_tmit_chunk *chk; 3442 struct sctp_stream_reset_request *req_param; 3443 struct sctp_stream_reset_out_request *req_out_param; 3444 struct sctp_stream_reset_in_request *req_in_param; 3445 uint32_t number_entries; 3446 3447 if (asoc->stream_reset_outstanding == 0) { 3448 /* duplicate */ 3449 return (0); 3450 } 3451 if (seq == stcb->asoc.str_reset_seq_out) { 3452 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3453 if (req_param != NULL) { 3454 stcb->asoc.str_reset_seq_out++; 3455 type = ntohs(req_param->ph.param_type); 3456 lparam_len = ntohs(req_param->ph.param_length); 3457 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3458 int no_clear = 0; 3459 3460 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3461 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3462 asoc->stream_reset_out_is_outstanding = 0; 3463 if (asoc->stream_reset_outstanding) 3464 asoc->stream_reset_outstanding--; 3465 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3466 /* do it */ 3467 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3468 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3469 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3470 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3471 /* 3472 * Set it up so we don't stop 3473 * retransmitting 3474 */ 3475 asoc->stream_reset_outstanding++; 3476 stcb->asoc.str_reset_seq_out--; 3477 asoc->stream_reset_out_is_outstanding = 1; 3478 no_clear = 1; 3479 } else { 3480 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3481 } 3482 if (no_clear == 0) { 3483 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3484 } 3485 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3486 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3487 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3488 if (asoc->stream_reset_outstanding) 3489 asoc->stream_reset_outstanding--; 3490 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3491 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3492 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3493 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3494 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3495 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3496 } 3497 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3498 /* Ok we now may have more streams */ 3499 int num_stream; 3500 3501 num_stream = stcb->asoc.strm_pending_add_size; 3502 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3503 /* TSNH */ 3504 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3505 } 3506 stcb->asoc.strm_pending_add_size = 0; 3507 if (asoc->stream_reset_outstanding) 3508 asoc->stream_reset_outstanding--; 3509 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3510 /* Put the new streams into effect */ 3511 int i; 3512 3513 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3514 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3515 } 3516 asoc->streamoutcnt += num_stream; 3517 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3518 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3519 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3520 SCTP_STREAM_CHANGE_DENIED); 3521 } else { 3522 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3523 SCTP_STREAM_CHANGE_FAILED); 3524 } 3525 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3526 if (asoc->stream_reset_outstanding) 3527 asoc->stream_reset_outstanding--; 3528 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3529 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3530 SCTP_STREAM_CHANGE_DENIED); 3531 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3532 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3533 SCTP_STREAM_CHANGE_FAILED); 3534 } 3535 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3536 /** 3537 * a) Adopt the new in tsn. 3538 * b) reset the map 3539 * c) Adopt the new out-tsn 3540 */ 3541 struct sctp_stream_reset_response_tsn *resp; 3542 struct sctp_forward_tsn_chunk fwdtsn; 3543 int abort_flag = 0; 3544 3545 if (respin == NULL) { 3546 /* huh ? */ 3547 return (0); 3548 } 3549 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3550 return (0); 3551 } 3552 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3553 resp = (struct sctp_stream_reset_response_tsn *)respin; 3554 asoc->stream_reset_outstanding--; 3555 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3556 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3557 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3558 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3559 if (abort_flag) { 3560 return (1); 3561 } 3562 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3563 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3564 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3565 } 3566 3567 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3568 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3569 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3570 3571 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3572 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3573 3574 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3575 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3576 3577 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3578 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3579 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3580 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3581 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3582 SCTP_ASSOC_RESET_DENIED); 3583 } else { 3584 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3585 SCTP_ASSOC_RESET_FAILED); 3586 } 3587 } 3588 /* get rid of the request and get the request flags */ 3589 if (asoc->stream_reset_outstanding == 0) { 3590 sctp_clean_up_stream_reset(stcb); 3591 } 3592 } 3593 } 3594 if (asoc->stream_reset_outstanding == 0) { 3595 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3596 } 3597 return (0); 3598 } 3599 3600 static void 3601 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3602 struct sctp_tmit_chunk *chk, 3603 struct sctp_stream_reset_in_request *req, int trunc) 3604 { 3605 uint32_t seq; 3606 int len, i; 3607 int number_entries; 3608 uint16_t temp; 3609 3610 /* 3611 * peer wants me to send a str-reset to him for my outgoing seq's if 3612 * seq_in is right. 3613 */ 3614 struct sctp_association *asoc = &stcb->asoc; 3615 3616 seq = ntohl(req->request_seq); 3617 if (asoc->str_reset_seq_in == seq) { 3618 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3619 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3620 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3621 } else if (trunc) { 3622 /* Can't do it, since they exceeded our buffer size */ 3623 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3624 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3625 len = ntohs(req->ph.param_length); 3626 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3627 if (number_entries) { 3628 for (i = 0; i < number_entries; i++) { 3629 temp = ntohs(req->list_of_streams[i]); 3630 if (temp >= stcb->asoc.streamoutcnt) { 3631 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3632 goto bad_boy; 3633 } 3634 req->list_of_streams[i] = temp; 3635 } 3636 for (i = 0; i < number_entries; i++) { 3637 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3638 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3639 } 3640 } 3641 } else { 3642 /* Its all */ 3643 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3644 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3645 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3646 } 3647 } 3648 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3649 } else { 3650 /* Can't do it, since we have sent one out */ 3651 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3652 } 3653 bad_boy: 3654 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3655 asoc->str_reset_seq_in++; 3656 } else if (asoc->str_reset_seq_in - 1 == seq) { 3657 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3658 } else if (asoc->str_reset_seq_in - 2 == seq) { 3659 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3660 } else { 3661 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3662 } 3663 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3664 } 3665 3666 static int 3667 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3668 struct sctp_tmit_chunk *chk, 3669 struct sctp_stream_reset_tsn_request *req) 3670 { 3671 /* reset all in and out and update the tsn */ 3672 /* 3673 * A) reset my str-seq's on in and out. B) Select a receive next, 3674 * and set cum-ack to it. Also process this selected number as a 3675 * fwd-tsn as well. C) set in the response my next sending seq. 3676 */ 3677 struct sctp_forward_tsn_chunk fwdtsn; 3678 struct sctp_association *asoc = &stcb->asoc; 3679 int abort_flag = 0; 3680 uint32_t seq; 3681 3682 seq = ntohl(req->request_seq); 3683 if (asoc->str_reset_seq_in == seq) { 3684 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3685 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3686 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3687 } else { 3688 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3689 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3690 fwdtsn.ch.chunk_flags = 0; 3691 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3692 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3693 if (abort_flag) { 3694 return (1); 3695 } 3696 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3697 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3698 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3699 } 3700 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3701 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3702 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3703 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3704 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3705 atomic_add_int(&asoc->sending_seq, 1); 3706 /* save off historical data for retrans */ 3707 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3708 asoc->last_sending_seq[0] = asoc->sending_seq; 3709 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3710 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3711 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3712 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3713 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3714 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3715 } 3716 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3717 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3718 asoc->str_reset_seq_in++; 3719 } else if (asoc->str_reset_seq_in - 1 == seq) { 3720 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3721 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3722 } else if (asoc->str_reset_seq_in - 2 == seq) { 3723 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3724 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3725 } else { 3726 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3727 } 3728 return (0); 3729 } 3730 3731 static void 3732 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3733 struct sctp_tmit_chunk *chk, 3734 struct sctp_stream_reset_out_request *req, int trunc) 3735 { 3736 uint32_t seq, tsn; 3737 int number_entries, len; 3738 struct sctp_association *asoc = &stcb->asoc; 3739 3740 seq = ntohl(req->request_seq); 3741 3742 /* now if its not a duplicate we process it */ 3743 if (asoc->str_reset_seq_in == seq) { 3744 len = ntohs(req->ph.param_length); 3745 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3746 /* 3747 * the sender is resetting, handle the list issue.. we must 3748 * a) verify if we can do the reset, if so no problem b) If 3749 * we can't do the reset we must copy the request. c) queue 3750 * it, and setup the data in processor to trigger it off 3751 * when needed and dequeue all the queued data. 3752 */ 3753 tsn = ntohl(req->send_reset_at_tsn); 3754 3755 /* move the reset action back one */ 3756 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3757 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3758 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3759 } else if (trunc) { 3760 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3761 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3762 /* we can do it now */ 3763 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3764 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3765 } else { 3766 /* 3767 * we must queue it up and thus wait for the TSN's 3768 * to arrive that are at or before tsn 3769 */ 3770 struct sctp_stream_reset_list *liste; 3771 int siz; 3772 3773 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3774 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3775 siz, SCTP_M_STRESET); 3776 if (liste == NULL) { 3777 /* gak out of memory */ 3778 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3779 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3780 return; 3781 } 3782 liste->seq = seq; 3783 liste->tsn = tsn; 3784 liste->number_entries = number_entries; 3785 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3786 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3787 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3788 } 3789 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3790 asoc->str_reset_seq_in++; 3791 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3792 /* 3793 * one seq back, just echo back last action since my 3794 * response was lost. 3795 */ 3796 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3797 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3798 /* 3799 * two seq back, just echo back last action since my 3800 * response was lost. 3801 */ 3802 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3803 } else { 3804 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3805 } 3806 } 3807 3808 static void 3809 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3810 struct sctp_stream_reset_add_strm *str_add) 3811 { 3812 /* 3813 * Peer is requesting to add more streams. If its within our 3814 * max-streams we will allow it. 3815 */ 3816 uint32_t num_stream, i; 3817 uint32_t seq; 3818 struct sctp_association *asoc = &stcb->asoc; 3819 struct sctp_queued_to_read *ctl, *nctl; 3820 3821 /* Get the number. */ 3822 seq = ntohl(str_add->request_seq); 3823 num_stream = ntohs(str_add->number_of_streams); 3824 /* Now what would be the new total? */ 3825 if (asoc->str_reset_seq_in == seq) { 3826 num_stream += stcb->asoc.streamincnt; 3827 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3828 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3829 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3830 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3831 (num_stream > 0xffff)) { 3832 /* We must reject it they ask for to many */ 3833 denied: 3834 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3835 } else { 3836 /* Ok, we can do that :-) */ 3837 struct sctp_stream_in *oldstrm; 3838 3839 /* save off the old */ 3840 oldstrm = stcb->asoc.strmin; 3841 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3842 (num_stream * sizeof(struct sctp_stream_in)), 3843 SCTP_M_STRMI); 3844 if (stcb->asoc.strmin == NULL) { 3845 stcb->asoc.strmin = oldstrm; 3846 goto denied; 3847 } 3848 /* copy off the old data */ 3849 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3850 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3851 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3852 stcb->asoc.strmin[i].sid = i; 3853 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3854 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3855 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3856 /* now anything on those queues? */ 3857 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3858 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3859 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3860 } 3861 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3862 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3863 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3864 } 3865 } 3866 /* Init the new streams */ 3867 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3868 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3869 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3870 stcb->asoc.strmin[i].sid = i; 3871 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3872 stcb->asoc.strmin[i].pd_api_started = 0; 3873 stcb->asoc.strmin[i].delivery_started = 0; 3874 } 3875 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3876 /* update the size */ 3877 stcb->asoc.streamincnt = num_stream; 3878 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3879 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3880 } 3881 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3882 asoc->str_reset_seq_in++; 3883 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3884 /* 3885 * one seq back, just echo back last action since my 3886 * response was lost. 3887 */ 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3890 /* 3891 * two seq back, just echo back last action since my 3892 * response was lost. 3893 */ 3894 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3895 } else { 3896 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3897 3898 } 3899 } 3900 3901 static void 3902 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3903 struct sctp_stream_reset_add_strm *str_add) 3904 { 3905 /* 3906 * Peer is requesting to add more streams. If its within our 3907 * max-streams we will allow it. 3908 */ 3909 uint16_t num_stream; 3910 uint32_t seq; 3911 struct sctp_association *asoc = &stcb->asoc; 3912 3913 /* Get the number. */ 3914 seq = ntohl(str_add->request_seq); 3915 num_stream = ntohs(str_add->number_of_streams); 3916 /* Now what would be the new total? */ 3917 if (asoc->str_reset_seq_in == seq) { 3918 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3919 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3920 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3921 } else if (stcb->asoc.stream_reset_outstanding) { 3922 /* We must reject it we have something pending */ 3923 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3924 } else { 3925 /* Ok, we can do that :-) */ 3926 int mychk; 3927 3928 mychk = stcb->asoc.streamoutcnt; 3929 mychk += num_stream; 3930 if (mychk < 0x10000) { 3931 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3932 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3933 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3934 } 3935 } else { 3936 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3937 } 3938 } 3939 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3940 asoc->str_reset_seq_in++; 3941 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3942 /* 3943 * one seq back, just echo back last action since my 3944 * response was lost. 3945 */ 3946 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3947 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3948 /* 3949 * two seq back, just echo back last action since my 3950 * response was lost. 3951 */ 3952 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3953 } else { 3954 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3955 } 3956 } 3957 3958 #ifdef __GNUC__ 3959 __attribute__((noinline)) 3960 #endif 3961 static int 3962 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3963 struct sctp_chunkhdr *ch_req) 3964 { 3965 uint16_t remaining_length, param_len, ptype; 3966 struct sctp_paramhdr pstore; 3967 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3968 uint32_t seq = 0; 3969 int num_req = 0; 3970 int trunc = 0; 3971 struct sctp_tmit_chunk *chk; 3972 struct sctp_chunkhdr *ch; 3973 struct sctp_paramhdr *ph; 3974 int ret_code = 0; 3975 int num_param = 0; 3976 3977 /* now it may be a reset or a reset-response */ 3978 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3979 3980 /* setup for adding the response */ 3981 sctp_alloc_a_chunk(stcb, chk); 3982 if (chk == NULL) { 3983 return (ret_code); 3984 } 3985 chk->copy_by_ref = 0; 3986 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3987 chk->rec.chunk_id.can_take_data = 0; 3988 chk->flags = 0; 3989 chk->asoc = &stcb->asoc; 3990 chk->no_fr_allowed = 0; 3991 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3992 chk->book_size_scale = 0; 3993 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3994 if (chk->data == NULL) { 3995 strres_nochunk: 3996 if (chk->data) { 3997 sctp_m_freem(chk->data); 3998 chk->data = NULL; 3999 } 4000 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4001 return (ret_code); 4002 } 4003 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4004 4005 /* setup chunk parameters */ 4006 chk->sent = SCTP_DATAGRAM_UNSENT; 4007 chk->snd_count = 0; 4008 chk->whoTo = NULL; 4009 4010 ch = mtod(chk->data, struct sctp_chunkhdr *); 4011 ch->chunk_type = SCTP_STREAM_RESET; 4012 ch->chunk_flags = 0; 4013 ch->chunk_length = htons(chk->send_size); 4014 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4015 offset += sizeof(struct sctp_chunkhdr); 4016 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4017 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4018 if (ph == NULL) { 4019 /* TSNH */ 4020 break; 4021 } 4022 param_len = ntohs(ph->param_length); 4023 if ((param_len > remaining_length) || 4024 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4025 /* bad parameter length */ 4026 break; 4027 } 4028 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4029 (uint8_t *)&cstore); 4030 if (ph == NULL) { 4031 /* TSNH */ 4032 break; 4033 } 4034 ptype = ntohs(ph->param_type); 4035 num_param++; 4036 if (param_len > sizeof(cstore)) { 4037 trunc = 1; 4038 } else { 4039 trunc = 0; 4040 } 4041 if (num_param > SCTP_MAX_RESET_PARAMS) { 4042 /* hit the max of parameters already sorry.. */ 4043 break; 4044 } 4045 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4046 struct sctp_stream_reset_out_request *req_out; 4047 4048 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4049 break; 4050 } 4051 req_out = (struct sctp_stream_reset_out_request *)ph; 4052 num_req++; 4053 if (stcb->asoc.stream_reset_outstanding) { 4054 seq = ntohl(req_out->response_seq); 4055 if (seq == stcb->asoc.str_reset_seq_out) { 4056 /* implicit ack */ 4057 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4058 } 4059 } 4060 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4061 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4062 struct sctp_stream_reset_add_strm *str_add; 4063 4064 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4065 break; 4066 } 4067 str_add = (struct sctp_stream_reset_add_strm *)ph; 4068 num_req++; 4069 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4070 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4071 struct sctp_stream_reset_add_strm *str_add; 4072 4073 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4074 break; 4075 } 4076 str_add = (struct sctp_stream_reset_add_strm *)ph; 4077 num_req++; 4078 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4079 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4080 struct sctp_stream_reset_in_request *req_in; 4081 4082 num_req++; 4083 req_in = (struct sctp_stream_reset_in_request *)ph; 4084 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4085 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4086 struct sctp_stream_reset_tsn_request *req_tsn; 4087 4088 num_req++; 4089 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4090 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4091 ret_code = 1; 4092 goto strres_nochunk; 4093 } 4094 /* no more */ 4095 break; 4096 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4097 struct sctp_stream_reset_response *resp; 4098 uint32_t result; 4099 4100 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4101 break; 4102 } 4103 resp = (struct sctp_stream_reset_response *)ph; 4104 seq = ntohl(resp->response_seq); 4105 result = ntohl(resp->result); 4106 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4107 ret_code = 1; 4108 goto strres_nochunk; 4109 } 4110 } else { 4111 break; 4112 } 4113 offset += SCTP_SIZE32(param_len); 4114 if (remaining_length >= SCTP_SIZE32(param_len)) { 4115 remaining_length -= SCTP_SIZE32(param_len); 4116 } else { 4117 remaining_length = 0; 4118 } 4119 } 4120 if (num_req == 0) { 4121 /* we have no response free the stuff */ 4122 goto strres_nochunk; 4123 } 4124 /* ok we have a chunk to link in */ 4125 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4126 chk, 4127 sctp_next); 4128 stcb->asoc.ctrl_queue_cnt++; 4129 return (ret_code); 4130 } 4131 4132 /* 4133 * Handle a router or endpoints report of a packet loss, there are two ways 4134 * to handle this, either we get the whole packet and must disect it 4135 * ourselves (possibly with truncation and or corruption) or it is a summary 4136 * from a middle box that did the disectting for us. 4137 */ 4138 static void 4139 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4140 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4141 { 4142 uint32_t bottle_bw, on_queue; 4143 uint16_t trunc_len; 4144 unsigned int chlen; 4145 unsigned int at; 4146 struct sctp_chunk_desc desc; 4147 struct sctp_chunkhdr *ch; 4148 4149 chlen = ntohs(cp->ch.chunk_length); 4150 chlen -= sizeof(struct sctp_pktdrop_chunk); 4151 /* XXX possible chlen underflow */ 4152 if (chlen == 0) { 4153 ch = NULL; 4154 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4155 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4156 } else { 4157 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4158 chlen -= sizeof(struct sctphdr); 4159 /* XXX possible chlen underflow */ 4160 memset(&desc, 0, sizeof(desc)); 4161 } 4162 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4163 if (trunc_len > limit) { 4164 trunc_len = limit; 4165 } 4166 4167 /* now the chunks themselves */ 4168 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4169 desc.chunk_type = ch->chunk_type; 4170 /* get amount we need to move */ 4171 at = ntohs(ch->chunk_length); 4172 if (at < sizeof(struct sctp_chunkhdr)) { 4173 /* corrupt chunk, maybe at the end? */ 4174 SCTP_STAT_INCR(sctps_pdrpcrupt); 4175 break; 4176 } 4177 if (trunc_len == 0) { 4178 /* we are supposed to have all of it */ 4179 if (at > chlen) { 4180 /* corrupt skip it */ 4181 SCTP_STAT_INCR(sctps_pdrpcrupt); 4182 break; 4183 } 4184 } else { 4185 /* is there enough of it left ? */ 4186 if (desc.chunk_type == SCTP_DATA) { 4187 if (chlen < (sizeof(struct sctp_data_chunk) + 4188 sizeof(desc.data_bytes))) { 4189 break; 4190 } 4191 } else { 4192 if (chlen < sizeof(struct sctp_chunkhdr)) { 4193 break; 4194 } 4195 } 4196 } 4197 if (desc.chunk_type == SCTP_DATA) { 4198 /* can we get out the tsn? */ 4199 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4200 SCTP_STAT_INCR(sctps_pdrpmbda); 4201 4202 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4203 /* yep */ 4204 struct sctp_data_chunk *dcp; 4205 uint8_t *ddp; 4206 unsigned int iii; 4207 4208 dcp = (struct sctp_data_chunk *)ch; 4209 ddp = (uint8_t *)(dcp + 1); 4210 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4211 desc.data_bytes[iii] = ddp[iii]; 4212 } 4213 desc.tsn_ifany = dcp->dp.tsn; 4214 } else { 4215 /* nope we are done. */ 4216 SCTP_STAT_INCR(sctps_pdrpnedat); 4217 break; 4218 } 4219 } else { 4220 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4221 SCTP_STAT_INCR(sctps_pdrpmbct); 4222 } 4223 4224 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4225 SCTP_STAT_INCR(sctps_pdrppdbrk); 4226 break; 4227 } 4228 if (SCTP_SIZE32(at) > chlen) { 4229 break; 4230 } 4231 chlen -= SCTP_SIZE32(at); 4232 if (chlen < sizeof(struct sctp_chunkhdr)) { 4233 /* done, none left */ 4234 break; 4235 } 4236 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4237 } 4238 /* Now update any rwnd --- possibly */ 4239 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4240 /* From a peer, we get a rwnd report */ 4241 uint32_t a_rwnd; 4242 4243 SCTP_STAT_INCR(sctps_pdrpfehos); 4244 4245 bottle_bw = ntohl(cp->bottle_bw); 4246 on_queue = ntohl(cp->current_onq); 4247 if (bottle_bw && on_queue) { 4248 /* a rwnd report is in here */ 4249 if (bottle_bw > on_queue) 4250 a_rwnd = bottle_bw - on_queue; 4251 else 4252 a_rwnd = 0; 4253 4254 if (a_rwnd == 0) 4255 stcb->asoc.peers_rwnd = 0; 4256 else { 4257 if (a_rwnd > stcb->asoc.total_flight) { 4258 stcb->asoc.peers_rwnd = 4259 a_rwnd - stcb->asoc.total_flight; 4260 } else { 4261 stcb->asoc.peers_rwnd = 0; 4262 } 4263 if (stcb->asoc.peers_rwnd < 4264 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4265 /* SWS sender side engages */ 4266 stcb->asoc.peers_rwnd = 0; 4267 } 4268 } 4269 } 4270 } else { 4271 SCTP_STAT_INCR(sctps_pdrpfmbox); 4272 } 4273 4274 /* now middle boxes in sat networks get a cwnd bump */ 4275 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4276 (stcb->asoc.sat_t3_loss_recovery == 0) && 4277 (stcb->asoc.sat_network)) { 4278 /* 4279 * This is debatable but for sat networks it makes sense 4280 * Note if a T3 timer has went off, we will prohibit any 4281 * changes to cwnd until we exit the t3 loss recovery. 4282 */ 4283 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4284 net, cp, &bottle_bw, &on_queue); 4285 } 4286 } 4287 4288 /* 4289 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4290 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4291 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4292 * length of the complete packet outputs: - length: modified to remaining 4293 * length after control processing - netp: modified to new sctp_nets after 4294 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4295 * bad packet,...) otherwise return the tcb for this packet 4296 */ 4297 #ifdef __GNUC__ 4298 __attribute__((noinline)) 4299 #endif 4300 static struct sctp_tcb * 4301 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4302 struct sockaddr *src, struct sockaddr *dst, 4303 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4304 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4305 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4306 uint32_t vrf_id, uint16_t port) 4307 { 4308 struct sctp_association *asoc; 4309 struct mbuf *op_err; 4310 char msg[SCTP_DIAG_INFO_LEN]; 4311 uint32_t vtag_in; 4312 int num_chunks = 0; /* number of control chunks processed */ 4313 uint32_t chk_length, contiguous; 4314 int ret; 4315 int abort_no_unlock = 0; 4316 int ecne_seen = 0; 4317 4318 /* 4319 * How big should this be, and should it be alloc'd? Lets try the 4320 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4321 * until we get into jumbo grams and such.. 4322 */ 4323 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4324 int got_auth = 0; 4325 uint32_t auth_offset = 0, auth_len = 0; 4326 int auth_skipped = 0; 4327 int asconf_cnt = 0; 4328 4329 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4330 iphlen, *offset, length, (void *)stcb); 4331 4332 if (stcb) { 4333 SCTP_TCB_LOCK_ASSERT(stcb); 4334 } 4335 /* validate chunk header length... */ 4336 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4337 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4338 ntohs(ch->chunk_length)); 4339 *offset = length; 4340 return (stcb); 4341 } 4342 /* 4343 * validate the verification tag 4344 */ 4345 vtag_in = ntohl(sh->v_tag); 4346 4347 if (ch->chunk_type == SCTP_INITIATION) { 4348 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4349 ntohs(ch->chunk_length), vtag_in); 4350 if (vtag_in != 0) { 4351 /* protocol error- silently discard... */ 4352 SCTP_STAT_INCR(sctps_badvtag); 4353 if (stcb != NULL) { 4354 SCTP_TCB_UNLOCK(stcb); 4355 } 4356 return (NULL); 4357 } 4358 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4359 /* 4360 * If there is no stcb, skip the AUTH chunk and process 4361 * later after a stcb is found (to validate the lookup was 4362 * valid. 4363 */ 4364 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4365 (stcb == NULL) && 4366 (inp->auth_supported == 1)) { 4367 /* save this chunk for later processing */ 4368 auth_skipped = 1; 4369 auth_offset = *offset; 4370 auth_len = ntohs(ch->chunk_length); 4371 4372 /* (temporarily) move past this chunk */ 4373 *offset += SCTP_SIZE32(auth_len); 4374 if (*offset >= length) { 4375 /* no more data left in the mbuf chain */ 4376 *offset = length; 4377 return (NULL); 4378 } 4379 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4380 sizeof(struct sctp_chunkhdr), chunk_buf); 4381 } 4382 if (ch == NULL) { 4383 /* Help */ 4384 *offset = length; 4385 return (stcb); 4386 } 4387 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4388 goto process_control_chunks; 4389 } 4390 /* 4391 * first check if it's an ASCONF with an unknown src addr we 4392 * need to look inside to find the association 4393 */ 4394 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4395 struct sctp_chunkhdr *asconf_ch = ch; 4396 uint32_t asconf_offset = 0, asconf_len = 0; 4397 4398 /* inp's refcount may be reduced */ 4399 SCTP_INP_INCR_REF(inp); 4400 4401 asconf_offset = *offset; 4402 do { 4403 asconf_len = ntohs(asconf_ch->chunk_length); 4404 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4405 break; 4406 stcb = sctp_findassociation_ep_asconf(m, 4407 *offset, 4408 dst, 4409 sh, &inp, netp, vrf_id); 4410 if (stcb != NULL) 4411 break; 4412 asconf_offset += SCTP_SIZE32(asconf_len); 4413 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4414 sizeof(struct sctp_chunkhdr), chunk_buf); 4415 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4416 if (stcb == NULL) { 4417 /* 4418 * reduce inp's refcount if not reduced in 4419 * sctp_findassociation_ep_asconf(). 4420 */ 4421 SCTP_INP_DECR_REF(inp); 4422 } 4423 4424 /* now go back and verify any auth chunk to be sure */ 4425 if (auth_skipped && (stcb != NULL)) { 4426 struct sctp_auth_chunk *auth; 4427 4428 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4429 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4430 got_auth = 1; 4431 auth_skipped = 0; 4432 } else { 4433 auth = NULL; 4434 } 4435 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4436 auth_offset)) { 4437 /* auth HMAC failed so dump it */ 4438 *offset = length; 4439 return (stcb); 4440 } else { 4441 /* remaining chunks are HMAC checked */ 4442 stcb->asoc.authenticated = 1; 4443 } 4444 } 4445 } 4446 if (stcb == NULL) { 4447 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4448 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4449 msg); 4450 /* no association, so it's out of the blue... */ 4451 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4452 mflowtype, mflowid, inp->fibnum, 4453 vrf_id, port); 4454 *offset = length; 4455 return (NULL); 4456 } 4457 asoc = &stcb->asoc; 4458 /* ABORT and SHUTDOWN can use either v_tag... */ 4459 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4460 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4461 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4462 /* Take the T-bit always into account. */ 4463 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4464 (vtag_in == asoc->my_vtag)) || 4465 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4466 (asoc->peer_vtag != htonl(0)) && 4467 (vtag_in == asoc->peer_vtag))) { 4468 /* this is valid */ 4469 } else { 4470 /* drop this packet... */ 4471 SCTP_STAT_INCR(sctps_badvtag); 4472 if (stcb != NULL) { 4473 SCTP_TCB_UNLOCK(stcb); 4474 } 4475 return (NULL); 4476 } 4477 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4478 if (vtag_in != asoc->my_vtag) { 4479 /* 4480 * this could be a stale SHUTDOWN-ACK or the 4481 * peer never got the SHUTDOWN-COMPLETE and 4482 * is still hung; we have started a new asoc 4483 * but it won't complete until the shutdown 4484 * is completed 4485 */ 4486 if (stcb != NULL) { 4487 SCTP_TCB_UNLOCK(stcb); 4488 } 4489 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4490 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4491 msg); 4492 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4493 sh, inp, op_err, 4494 mflowtype, mflowid, fibnum, 4495 vrf_id, port); 4496 return (NULL); 4497 } 4498 } else { 4499 /* for all other chunks, vtag must match */ 4500 if (vtag_in != asoc->my_vtag) { 4501 /* invalid vtag... */ 4502 SCTPDBG(SCTP_DEBUG_INPUT3, 4503 "invalid vtag: %xh, expect %xh\n", 4504 vtag_in, asoc->my_vtag); 4505 SCTP_STAT_INCR(sctps_badvtag); 4506 if (stcb != NULL) { 4507 SCTP_TCB_UNLOCK(stcb); 4508 } 4509 *offset = length; 4510 return (NULL); 4511 } 4512 } 4513 } /* end if !SCTP_COOKIE_ECHO */ 4514 /* 4515 * process all control chunks... 4516 */ 4517 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4518 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4519 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4520 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4521 /* implied cookie-ack.. we must have lost the ack */ 4522 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4523 *netp); 4524 } 4525 4526 process_control_chunks: 4527 while (IS_SCTP_CONTROL(ch)) { 4528 /* validate chunk length */ 4529 chk_length = ntohs(ch->chunk_length); 4530 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4531 ch->chunk_type, chk_length); 4532 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4533 if (chk_length < sizeof(*ch) || 4534 (*offset + (int)chk_length) > length) { 4535 *offset = length; 4536 return (stcb); 4537 } 4538 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4539 /* 4540 * INIT and INIT-ACK only gets the init ack "header" portion 4541 * only because we don't have to process the peer's COOKIE. 4542 * All others get a complete chunk. 4543 */ 4544 switch (ch->chunk_type) { 4545 case SCTP_INITIATION: 4546 contiguous = sizeof(struct sctp_init_chunk); 4547 break; 4548 case SCTP_INITIATION_ACK: 4549 contiguous = sizeof(struct sctp_init_ack_chunk); 4550 break; 4551 default: 4552 contiguous = min(chk_length, sizeof(chunk_buf)); 4553 break; 4554 } 4555 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4556 contiguous, 4557 chunk_buf); 4558 if (ch == NULL) { 4559 *offset = length; 4560 if (stcb != NULL) { 4561 SCTP_TCB_UNLOCK(stcb); 4562 } 4563 return (NULL); 4564 } 4565 4566 num_chunks++; 4567 /* Save off the last place we got a control from */ 4568 if (stcb != NULL) { 4569 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4570 /* 4571 * allow last_control to be NULL if 4572 * ASCONF... ASCONF processing will find the 4573 * right net later 4574 */ 4575 if ((netp != NULL) && (*netp != NULL)) 4576 stcb->asoc.last_control_chunk_from = *netp; 4577 } 4578 } 4579 #ifdef SCTP_AUDITING_ENABLED 4580 sctp_audit_log(0xB0, ch->chunk_type); 4581 #endif 4582 4583 /* check to see if this chunk required auth, but isn't */ 4584 if ((stcb != NULL) && 4585 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4586 !stcb->asoc.authenticated) { 4587 /* "silently" ignore */ 4588 SCTP_STAT_INCR(sctps_recvauthmissing); 4589 goto next_chunk; 4590 } 4591 switch (ch->chunk_type) { 4592 case SCTP_INITIATION: 4593 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4594 /* The INIT chunk must be the only chunk. */ 4595 if ((num_chunks > 1) || 4596 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4597 /* RFC 4960 requires that no ABORT is sent */ 4598 *offset = length; 4599 if (stcb != NULL) { 4600 SCTP_TCB_UNLOCK(stcb); 4601 } 4602 return (NULL); 4603 } 4604 /* Honor our resource limit. */ 4605 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4606 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4607 sctp_abort_association(inp, stcb, m, iphlen, 4608 src, dst, sh, op_err, 4609 mflowtype, mflowid, 4610 vrf_id, port); 4611 *offset = length; 4612 return (NULL); 4613 } 4614 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4615 (struct sctp_init_chunk *)ch, inp, 4616 stcb, *netp, &abort_no_unlock, 4617 mflowtype, mflowid, 4618 vrf_id, port); 4619 *offset = length; 4620 if ((!abort_no_unlock) && (stcb != NULL)) { 4621 SCTP_TCB_UNLOCK(stcb); 4622 } 4623 return (NULL); 4624 break; 4625 case SCTP_PAD_CHUNK: 4626 break; 4627 case SCTP_INITIATION_ACK: 4628 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4629 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4630 /* We are not interested anymore */ 4631 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4632 ; 4633 } else { 4634 *offset = length; 4635 if (stcb != NULL) { 4636 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4637 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4638 } 4639 return (NULL); 4640 } 4641 } 4642 /* The INIT-ACK chunk must be the only chunk. */ 4643 if ((num_chunks > 1) || 4644 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4645 *offset = length; 4646 return (stcb); 4647 } 4648 if ((netp != NULL) && (*netp != NULL)) { 4649 ret = sctp_handle_init_ack(m, iphlen, *offset, 4650 src, dst, sh, 4651 (struct sctp_init_ack_chunk *)ch, 4652 stcb, *netp, 4653 &abort_no_unlock, 4654 mflowtype, mflowid, 4655 vrf_id); 4656 } else { 4657 ret = -1; 4658 } 4659 *offset = length; 4660 if (abort_no_unlock) { 4661 return (NULL); 4662 } 4663 /* 4664 * Special case, I must call the output routine to 4665 * get the cookie echoed 4666 */ 4667 if ((stcb != NULL) && (ret == 0)) { 4668 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4669 } 4670 return (stcb); 4671 break; 4672 case SCTP_SELECTIVE_ACK: 4673 case SCTP_NR_SELECTIVE_ACK: 4674 { 4675 int abort_now = 0; 4676 uint32_t a_rwnd, cum_ack; 4677 uint16_t num_seg, num_nr_seg, num_dup; 4678 uint8_t flags; 4679 int offset_seg, offset_dup; 4680 4681 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4682 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4683 SCTP_STAT_INCR(sctps_recvsacks); 4684 if (stcb == NULL) { 4685 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4686 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4687 break; 4688 } 4689 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4690 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4691 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4692 break; 4693 } 4694 } else { 4695 if (stcb->asoc.nrsack_supported == 0) { 4696 goto unknown_chunk; 4697 } 4698 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4699 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4700 break; 4701 } 4702 } 4703 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4704 /*- 4705 * If we have sent a shutdown-ack, we will pay no 4706 * attention to a sack sent in to us since 4707 * we don't care anymore. 4708 */ 4709 break; 4710 } 4711 flags = ch->chunk_flags; 4712 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4713 struct sctp_sack_chunk *sack; 4714 4715 sack = (struct sctp_sack_chunk *)ch; 4716 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4717 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4718 num_nr_seg = 0; 4719 num_dup = ntohs(sack->sack.num_dup_tsns); 4720 a_rwnd = ntohl(sack->sack.a_rwnd); 4721 if (sizeof(struct sctp_sack_chunk) + 4722 num_seg * sizeof(struct sctp_gap_ack_block) + 4723 num_dup * sizeof(uint32_t) != chk_length) { 4724 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4725 break; 4726 } 4727 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4728 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4729 } else { 4730 struct sctp_nr_sack_chunk *nr_sack; 4731 4732 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4733 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4734 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4735 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4736 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4737 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4738 if (sizeof(struct sctp_nr_sack_chunk) + 4739 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4740 num_dup * sizeof(uint32_t) != chk_length) { 4741 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4742 break; 4743 } 4744 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4745 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4746 } 4747 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4748 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4749 cum_ack, num_seg, a_rwnd); 4750 stcb->asoc.seen_a_sack_this_pkt = 1; 4751 if ((stcb->asoc.pr_sctp_cnt == 0) && 4752 (num_seg == 0) && (num_nr_seg == 0) && 4753 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4754 (stcb->asoc.saw_sack_with_frags == 0) && 4755 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4756 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4757 /* 4758 * We have a SIMPLE sack having no 4759 * prior segments and data on sent 4760 * queue to be acked. Use the faster 4761 * path sack processing. We also 4762 * allow window update sacks with no 4763 * missing segments to go this way 4764 * too. 4765 */ 4766 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4767 &abort_now, ecne_seen); 4768 } else { 4769 if ((netp != NULL) && (*netp != NULL)) { 4770 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4771 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4772 cum_ack, a_rwnd, ecne_seen); 4773 } 4774 } 4775 if (abort_now) { 4776 /* ABORT signal from sack processing */ 4777 *offset = length; 4778 return (NULL); 4779 } 4780 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4781 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4782 (stcb->asoc.stream_queue_cnt == 0)) { 4783 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4784 } 4785 break; 4786 } 4787 case SCTP_HEARTBEAT_REQUEST: 4788 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4789 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4790 SCTP_STAT_INCR(sctps_recvheartbeat); 4791 sctp_send_heartbeat_ack(stcb, m, *offset, 4792 chk_length, *netp); 4793 } 4794 break; 4795 case SCTP_HEARTBEAT_ACK: 4796 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4797 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4798 /* Its not ours */ 4799 *offset = length; 4800 return (stcb); 4801 } 4802 SCTP_STAT_INCR(sctps_recvheartbeatack); 4803 if ((netp != NULL) && (*netp != NULL)) { 4804 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4805 stcb, *netp); 4806 } 4807 break; 4808 case SCTP_ABORT_ASSOCIATION: 4809 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4810 (void *)stcb); 4811 *offset = length; 4812 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4813 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4814 return (NULL); 4815 } else { 4816 return (stcb); 4817 } 4818 } else { 4819 return (NULL); 4820 } 4821 break; 4822 case SCTP_SHUTDOWN: 4823 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4824 (void *)stcb); 4825 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4826 *offset = length; 4827 return (stcb); 4828 } 4829 if ((netp != NULL) && (*netp != NULL)) { 4830 int abort_flag = 0; 4831 4832 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4833 stcb, *netp, &abort_flag); 4834 if (abort_flag) { 4835 *offset = length; 4836 return (NULL); 4837 } 4838 } 4839 break; 4840 case SCTP_SHUTDOWN_ACK: 4841 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4842 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4843 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4844 } 4845 *offset = length; 4846 return (NULL); 4847 break; 4848 case SCTP_OPERATION_ERROR: 4849 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4850 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4851 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4852 *offset = length; 4853 return (NULL); 4854 } 4855 break; 4856 case SCTP_COOKIE_ECHO: 4857 SCTPDBG(SCTP_DEBUG_INPUT3, 4858 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4859 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4860 ; 4861 } else { 4862 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4863 /* We are not interested anymore */ 4864 abend: 4865 if (stcb != NULL) { 4866 SCTP_TCB_UNLOCK(stcb); 4867 } 4868 *offset = length; 4869 return (NULL); 4870 } 4871 } 4872 /*- 4873 * First are we accepting? We do this again here 4874 * since it is possible that a previous endpoint WAS 4875 * listening responded to a INIT-ACK and then 4876 * closed. We opened and bound.. and are now no 4877 * longer listening. 4878 * 4879 * XXXGL: notes on checking listen queue length. 4880 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4881 * SOLISTENING(), because a listening "UDP type" 4882 * socket isn't listening in terms of the socket 4883 * layer. It is a normal data flow socket, that 4884 * can fork off new connections. Thus, we should 4885 * look into sol_qlen only in case we are !UDP. 4886 * 2) Checking sol_qlen in general requires locking 4887 * the socket, and this code lacks that. 4888 */ 4889 if ((stcb == NULL) && 4890 (!SCTP_IS_LISTENING(inp) || 4891 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4892 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4893 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4894 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4895 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4896 sctp_abort_association(inp, stcb, m, iphlen, 4897 src, dst, sh, op_err, 4898 mflowtype, mflowid, 4899 vrf_id, port); 4900 } 4901 *offset = length; 4902 return (NULL); 4903 } else { 4904 struct mbuf *ret_buf; 4905 struct sctp_inpcb *linp; 4906 struct sctp_tmit_chunk *chk; 4907 4908 if (stcb) { 4909 linp = NULL; 4910 } else { 4911 linp = inp; 4912 } 4913 4914 if (linp != NULL) { 4915 SCTP_ASOC_CREATE_LOCK(linp); 4916 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4917 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4918 SCTP_ASOC_CREATE_UNLOCK(linp); 4919 goto abend; 4920 } 4921 } 4922 4923 if (netp != NULL) { 4924 struct sctp_tcb *locked_stcb; 4925 4926 locked_stcb = stcb; 4927 ret_buf = 4928 sctp_handle_cookie_echo(m, iphlen, 4929 *offset, 4930 src, dst, 4931 sh, 4932 (struct sctp_cookie_echo_chunk *)ch, 4933 &inp, &stcb, netp, 4934 auth_skipped, 4935 auth_offset, 4936 auth_len, 4937 &locked_stcb, 4938 mflowtype, 4939 mflowid, 4940 vrf_id, 4941 port); 4942 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4943 SCTP_TCB_UNLOCK(locked_stcb); 4944 } 4945 if (stcb != NULL) { 4946 SCTP_TCB_LOCK_ASSERT(stcb); 4947 } 4948 } else { 4949 ret_buf = NULL; 4950 } 4951 if (linp != NULL) { 4952 SCTP_ASOC_CREATE_UNLOCK(linp); 4953 } 4954 if (ret_buf == NULL) { 4955 if (stcb != NULL) { 4956 SCTP_TCB_UNLOCK(stcb); 4957 } 4958 SCTPDBG(SCTP_DEBUG_INPUT3, 4959 "GAK, null buffer\n"); 4960 *offset = length; 4961 return (NULL); 4962 } 4963 /* if AUTH skipped, see if it verified... */ 4964 if (auth_skipped) { 4965 got_auth = 1; 4966 auth_skipped = 0; 4967 } 4968 /* Restart the timer if we have pending data */ 4969 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4970 if (chk->whoTo != NULL) { 4971 break; 4972 } 4973 } 4974 if (chk != NULL) { 4975 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4976 } 4977 } 4978 break; 4979 case SCTP_COOKIE_ACK: 4980 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4981 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4982 return (stcb); 4983 } 4984 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4985 /* We are not interested anymore */ 4986 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4987 ; 4988 } else if (stcb) { 4989 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4990 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4991 *offset = length; 4992 return (NULL); 4993 } 4994 } 4995 if ((netp != NULL) && (*netp != NULL)) { 4996 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4997 } 4998 break; 4999 case SCTP_ECN_ECHO: 5000 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5001 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5002 /* Its not ours */ 5003 *offset = length; 5004 return (stcb); 5005 } 5006 if (stcb->asoc.ecn_supported == 0) { 5007 goto unknown_chunk; 5008 } 5009 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5010 ecne_seen = 1; 5011 break; 5012 case SCTP_ECN_CWR: 5013 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5014 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5015 *offset = length; 5016 return (stcb); 5017 } 5018 if (stcb->asoc.ecn_supported == 0) { 5019 goto unknown_chunk; 5020 } 5021 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5022 break; 5023 case SCTP_SHUTDOWN_COMPLETE: 5024 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5025 /* must be first and only chunk */ 5026 if ((num_chunks > 1) || 5027 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5028 *offset = length; 5029 return (stcb); 5030 } 5031 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5032 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5033 stcb, *netp); 5034 } 5035 *offset = length; 5036 return (NULL); 5037 break; 5038 case SCTP_ASCONF: 5039 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5040 if (stcb != NULL) { 5041 if (stcb->asoc.asconf_supported == 0) { 5042 goto unknown_chunk; 5043 } 5044 sctp_handle_asconf(m, *offset, src, 5045 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5046 asconf_cnt++; 5047 } 5048 break; 5049 case SCTP_ASCONF_ACK: 5050 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5051 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5052 /* Its not ours */ 5053 *offset = length; 5054 return (stcb); 5055 } 5056 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5057 if (stcb->asoc.asconf_supported == 0) { 5058 goto unknown_chunk; 5059 } 5060 /* He's alive so give him credit */ 5061 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5062 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5063 stcb->asoc.overall_error_count, 5064 0, 5065 SCTP_FROM_SCTP_INPUT, 5066 __LINE__); 5067 } 5068 stcb->asoc.overall_error_count = 0; 5069 sctp_handle_asconf_ack(m, *offset, 5070 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5071 if (abort_no_unlock) 5072 return (NULL); 5073 } 5074 break; 5075 case SCTP_FORWARD_CUM_TSN: 5076 case SCTP_IFORWARD_CUM_TSN: 5077 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5078 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5079 /* Its not ours */ 5080 *offset = length; 5081 return (stcb); 5082 } 5083 5084 if (stcb != NULL) { 5085 int abort_flag = 0; 5086 5087 if (stcb->asoc.prsctp_supported == 0) { 5088 goto unknown_chunk; 5089 } 5090 *fwd_tsn_seen = 1; 5091 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5092 /* We are not interested anymore */ 5093 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5094 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5095 *offset = length; 5096 return (NULL); 5097 } 5098 /* 5099 * For sending a SACK this looks like DATA 5100 * chunks. 5101 */ 5102 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5103 sctp_handle_forward_tsn(stcb, 5104 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5105 if (abort_flag) { 5106 *offset = length; 5107 return (NULL); 5108 } 5109 } 5110 break; 5111 case SCTP_STREAM_RESET: 5112 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5113 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5114 /* Its not ours */ 5115 *offset = length; 5116 return (stcb); 5117 } 5118 if (stcb->asoc.reconfig_supported == 0) { 5119 goto unknown_chunk; 5120 } 5121 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5122 /* stop processing */ 5123 *offset = length; 5124 return (NULL); 5125 } 5126 break; 5127 case SCTP_PACKET_DROPPED: 5128 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5129 /* re-get it all please */ 5130 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5131 /* Its not ours */ 5132 *offset = length; 5133 return (stcb); 5134 } 5135 5136 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5137 if (stcb->asoc.pktdrop_supported == 0) { 5138 goto unknown_chunk; 5139 } 5140 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5141 stcb, *netp, 5142 min(chk_length, contiguous)); 5143 } 5144 break; 5145 case SCTP_AUTHENTICATION: 5146 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5147 if (stcb == NULL) { 5148 /* save the first AUTH for later processing */ 5149 if (auth_skipped == 0) { 5150 auth_offset = *offset; 5151 auth_len = chk_length; 5152 auth_skipped = 1; 5153 } 5154 /* skip this chunk (temporarily) */ 5155 goto next_chunk; 5156 } 5157 if (stcb->asoc.auth_supported == 0) { 5158 goto unknown_chunk; 5159 } 5160 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5161 (chk_length > (sizeof(struct sctp_auth_chunk) + 5162 SCTP_AUTH_DIGEST_LEN_MAX))) { 5163 /* Its not ours */ 5164 *offset = length; 5165 return (stcb); 5166 } 5167 if (got_auth == 1) { 5168 /* skip this chunk... it's already auth'd */ 5169 goto next_chunk; 5170 } 5171 got_auth = 1; 5172 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5173 m, *offset)) { 5174 /* auth HMAC failed so dump the packet */ 5175 *offset = length; 5176 return (stcb); 5177 } else { 5178 /* remaining chunks are HMAC checked */ 5179 stcb->asoc.authenticated = 1; 5180 } 5181 break; 5182 5183 default: 5184 unknown_chunk: 5185 /* it's an unknown chunk! */ 5186 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5187 struct sctp_gen_error_cause *cause; 5188 int len; 5189 5190 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5191 0, M_NOWAIT, 1, MT_DATA); 5192 if (op_err != NULL) { 5193 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5194 cause = mtod(op_err, struct sctp_gen_error_cause *); 5195 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5196 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5197 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5198 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5199 if (SCTP_BUF_NEXT(op_err) != NULL) { 5200 #ifdef SCTP_MBUF_LOGGING 5201 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5202 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5203 } 5204 #endif 5205 sctp_queue_op_err(stcb, op_err); 5206 } else { 5207 sctp_m_freem(op_err); 5208 } 5209 } 5210 } 5211 if ((ch->chunk_type & 0x80) == 0) { 5212 /* discard this packet */ 5213 *offset = length; 5214 return (stcb); 5215 } /* else skip this bad chunk and continue... */ 5216 break; 5217 } /* switch (ch->chunk_type) */ 5218 5219 5220 next_chunk: 5221 /* get the next chunk */ 5222 *offset += SCTP_SIZE32(chk_length); 5223 if (*offset >= length) { 5224 /* no more data left in the mbuf chain */ 5225 break; 5226 } 5227 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5228 sizeof(struct sctp_chunkhdr), chunk_buf); 5229 if (ch == NULL) { 5230 *offset = length; 5231 return (stcb); 5232 } 5233 } /* while */ 5234 5235 if ((asconf_cnt > 0) && (stcb != NULL)) { 5236 sctp_send_asconf_ack(stcb); 5237 } 5238 return (stcb); 5239 } 5240 5241 5242 /* 5243 * common input chunk processing (v4 and v6) 5244 */ 5245 void 5246 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5247 struct sockaddr *src, struct sockaddr *dst, 5248 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5249 uint8_t compute_crc, 5250 uint8_t ecn_bits, 5251 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5252 uint32_t vrf_id, uint16_t port) 5253 { 5254 uint32_t high_tsn; 5255 int fwd_tsn_seen = 0, data_processed = 0; 5256 struct mbuf *m = *mm, *op_err; 5257 char msg[SCTP_DIAG_INFO_LEN]; 5258 int un_sent; 5259 int cnt_ctrl_ready = 0; 5260 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5261 struct sctp_tcb *stcb = NULL; 5262 struct sctp_nets *net = NULL; 5263 5264 SCTP_STAT_INCR(sctps_recvdatagrams); 5265 #ifdef SCTP_AUDITING_ENABLED 5266 sctp_audit_log(0xE0, 1); 5267 sctp_auditing(0, inp, stcb, net); 5268 #endif 5269 if (compute_crc != 0) { 5270 uint32_t check, calc_check; 5271 5272 check = sh->checksum; 5273 sh->checksum = 0; 5274 calc_check = sctp_calculate_cksum(m, iphlen); 5275 sh->checksum = check; 5276 if (calc_check != check) { 5277 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5278 calc_check, check, (void *)m, length, iphlen); 5279 stcb = sctp_findassociation_addr(m, offset, src, dst, 5280 sh, ch, &inp, &net, vrf_id); 5281 #if defined(INET) || defined(INET6) 5282 if ((ch->chunk_type != SCTP_INITIATION) && 5283 (net != NULL) && (net->port != port)) { 5284 if (net->port == 0) { 5285 /* UDP encapsulation turned on. */ 5286 net->mtu -= sizeof(struct udphdr); 5287 if (stcb->asoc.smallest_mtu > net->mtu) { 5288 sctp_pathmtu_adjustment(stcb, net->mtu); 5289 } 5290 } else if (port == 0) { 5291 /* UDP encapsulation turned off. */ 5292 net->mtu += sizeof(struct udphdr); 5293 /* XXX Update smallest_mtu */ 5294 } 5295 net->port = port; 5296 } 5297 #endif 5298 if (net != NULL) { 5299 net->flowtype = mflowtype; 5300 net->flowid = mflowid; 5301 } 5302 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5303 if ((inp != NULL) && (stcb != NULL)) { 5304 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5305 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5306 } else if ((inp != NULL) && (stcb == NULL)) { 5307 inp_decr = inp; 5308 } 5309 SCTP_STAT_INCR(sctps_badsum); 5310 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5311 goto out; 5312 } 5313 } 5314 /* Destination port of 0 is illegal, based on RFC4960. */ 5315 if (sh->dest_port == 0) { 5316 SCTP_STAT_INCR(sctps_hdrops); 5317 goto out; 5318 } 5319 stcb = sctp_findassociation_addr(m, offset, src, dst, 5320 sh, ch, &inp, &net, vrf_id); 5321 #if defined(INET) || defined(INET6) 5322 if ((ch->chunk_type != SCTP_INITIATION) && 5323 (net != NULL) && (net->port != port)) { 5324 if (net->port == 0) { 5325 /* UDP encapsulation turned on. */ 5326 net->mtu -= sizeof(struct udphdr); 5327 if (stcb->asoc.smallest_mtu > net->mtu) { 5328 sctp_pathmtu_adjustment(stcb, net->mtu); 5329 } 5330 } else if (port == 0) { 5331 /* UDP encapsulation turned off. */ 5332 net->mtu += sizeof(struct udphdr); 5333 /* XXX Update smallest_mtu */ 5334 } 5335 net->port = port; 5336 } 5337 #endif 5338 if (net != NULL) { 5339 net->flowtype = mflowtype; 5340 net->flowid = mflowid; 5341 } 5342 if (inp == NULL) { 5343 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5344 SCTP_STAT_INCR(sctps_noport); 5345 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5346 goto out; 5347 } 5348 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5349 sctp_send_shutdown_complete2(src, dst, sh, 5350 mflowtype, mflowid, fibnum, 5351 vrf_id, port); 5352 goto out; 5353 } 5354 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5355 goto out; 5356 } 5357 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5358 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5359 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5360 (ch->chunk_type != SCTP_INIT))) { 5361 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5362 "Out of the blue"); 5363 sctp_send_abort(m, iphlen, src, dst, 5364 sh, 0, op_err, 5365 mflowtype, mflowid, fibnum, 5366 vrf_id, port); 5367 } 5368 } 5369 goto out; 5370 } else if (stcb == NULL) { 5371 inp_decr = inp; 5372 } 5373 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5374 (void *)m, iphlen, offset, length, (void *)stcb); 5375 if (stcb) { 5376 /* always clear this before beginning a packet */ 5377 stcb->asoc.authenticated = 0; 5378 stcb->asoc.seen_a_sack_this_pkt = 0; 5379 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5380 (void *)stcb, stcb->asoc.state); 5381 5382 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5383 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5384 /*- 5385 * If we hit here, we had a ref count 5386 * up when the assoc was aborted and the 5387 * timer is clearing out the assoc, we should 5388 * NOT respond to any packet.. its OOTB. 5389 */ 5390 SCTP_TCB_UNLOCK(stcb); 5391 stcb = NULL; 5392 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5393 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5394 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5395 msg); 5396 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5397 mflowtype, mflowid, inp->fibnum, 5398 vrf_id, port); 5399 goto out; 5400 } 5401 } 5402 if (IS_SCTP_CONTROL(ch)) { 5403 /* process the control portion of the SCTP packet */ 5404 /* sa_ignore NO_NULL_CHK */ 5405 stcb = sctp_process_control(m, iphlen, &offset, length, 5406 src, dst, sh, ch, 5407 inp, stcb, &net, &fwd_tsn_seen, 5408 mflowtype, mflowid, fibnum, 5409 vrf_id, port); 5410 if (stcb) { 5411 /* 5412 * This covers us if the cookie-echo was there and 5413 * it changes our INP. 5414 */ 5415 inp = stcb->sctp_ep; 5416 #if defined(INET) || defined(INET6) 5417 if ((ch->chunk_type != SCTP_INITIATION) && 5418 (net != NULL) && (net->port != port)) { 5419 if (net->port == 0) { 5420 /* UDP encapsulation turned on. */ 5421 net->mtu -= sizeof(struct udphdr); 5422 if (stcb->asoc.smallest_mtu > net->mtu) { 5423 sctp_pathmtu_adjustment(stcb, net->mtu); 5424 } 5425 } else if (port == 0) { 5426 /* UDP encapsulation turned off. */ 5427 net->mtu += sizeof(struct udphdr); 5428 /* XXX Update smallest_mtu */ 5429 } 5430 net->port = port; 5431 } 5432 #endif 5433 } 5434 } else { 5435 /* 5436 * no control chunks, so pre-process DATA chunks (these 5437 * checks are taken care of by control processing) 5438 */ 5439 5440 /* 5441 * if DATA only packet, and auth is required, then punt... 5442 * can't have authenticated without any AUTH (control) 5443 * chunks 5444 */ 5445 if ((stcb != NULL) && 5446 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5447 /* "silently" ignore */ 5448 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5449 SCTP_STAT_INCR(sctps_recvauthmissing); 5450 goto out; 5451 } 5452 if (stcb == NULL) { 5453 /* out of the blue DATA chunk */ 5454 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5455 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5456 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5457 msg); 5458 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5459 mflowtype, mflowid, fibnum, 5460 vrf_id, port); 5461 goto out; 5462 } 5463 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5464 /* v_tag mismatch! */ 5465 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5466 SCTP_STAT_INCR(sctps_badvtag); 5467 goto out; 5468 } 5469 } 5470 5471 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5472 if (stcb == NULL) { 5473 /* 5474 * no valid TCB for this packet, or we found it's a bad 5475 * packet while processing control, or we're done with this 5476 * packet (done or skip rest of data), so we drop it... 5477 */ 5478 goto out; 5479 } 5480 5481 /* 5482 * DATA chunk processing 5483 */ 5484 /* plow through the data chunks while length > offset */ 5485 5486 /* 5487 * Rest should be DATA only. Check authentication state if AUTH for 5488 * DATA is required. 5489 */ 5490 if ((length > offset) && 5491 (stcb != NULL) && 5492 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5493 !stcb->asoc.authenticated) { 5494 /* "silently" ignore */ 5495 SCTP_STAT_INCR(sctps_recvauthmissing); 5496 SCTPDBG(SCTP_DEBUG_AUTH1, 5497 "Data chunk requires AUTH, skipped\n"); 5498 goto trigger_send; 5499 } 5500 if (length > offset) { 5501 int retval; 5502 5503 /* 5504 * First check to make sure our state is correct. We would 5505 * not get here unless we really did have a tag, so we don't 5506 * abort if this happens, just dump the chunk silently. 5507 */ 5508 switch (SCTP_GET_STATE(stcb)) { 5509 case SCTP_STATE_COOKIE_ECHOED: 5510 /* 5511 * we consider data with valid tags in this state 5512 * shows us the cookie-ack was lost. Imply it was 5513 * there. 5514 */ 5515 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5516 break; 5517 case SCTP_STATE_COOKIE_WAIT: 5518 /* 5519 * We consider OOTB any data sent during asoc setup. 5520 */ 5521 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5522 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5523 msg); 5524 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5525 mflowtype, mflowid, inp->fibnum, 5526 vrf_id, port); 5527 goto out; 5528 /* sa_ignore NOTREACHED */ 5529 break; 5530 case SCTP_STATE_EMPTY: /* should not happen */ 5531 case SCTP_STATE_INUSE: /* should not happen */ 5532 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5533 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5534 default: 5535 goto out; 5536 /* sa_ignore NOTREACHED */ 5537 break; 5538 case SCTP_STATE_OPEN: 5539 case SCTP_STATE_SHUTDOWN_SENT: 5540 break; 5541 } 5542 /* plow through the data chunks while length > offset */ 5543 retval = sctp_process_data(mm, iphlen, &offset, length, 5544 inp, stcb, net, &high_tsn); 5545 if (retval == 2) { 5546 /* 5547 * The association aborted, NO UNLOCK needed since 5548 * the association is destroyed. 5549 */ 5550 stcb = NULL; 5551 goto out; 5552 } 5553 data_processed = 1; 5554 /* 5555 * Anything important needs to have been m_copy'ed in 5556 * process_data 5557 */ 5558 } 5559 5560 /* take care of ecn */ 5561 if ((data_processed == 1) && 5562 (stcb->asoc.ecn_supported == 1) && 5563 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5564 /* Yep, we need to add a ECNE */ 5565 sctp_send_ecn_echo(stcb, net, high_tsn); 5566 } 5567 5568 if ((data_processed == 0) && (fwd_tsn_seen)) { 5569 int was_a_gap; 5570 uint32_t highest_tsn; 5571 5572 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5573 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5574 } else { 5575 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5576 } 5577 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5578 stcb->asoc.send_sack = 1; 5579 sctp_sack_check(stcb, was_a_gap); 5580 } else if (fwd_tsn_seen) { 5581 stcb->asoc.send_sack = 1; 5582 } 5583 /* trigger send of any chunks in queue... */ 5584 trigger_send: 5585 #ifdef SCTP_AUDITING_ENABLED 5586 sctp_audit_log(0xE0, 2); 5587 sctp_auditing(1, inp, stcb, net); 5588 #endif 5589 SCTPDBG(SCTP_DEBUG_INPUT1, 5590 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5591 stcb->asoc.peers_rwnd, 5592 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5593 stcb->asoc.total_flight); 5594 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5595 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5596 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5597 } 5598 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5599 cnt_ctrl_ready || 5600 stcb->asoc.trigger_reset || 5601 ((un_sent) && 5602 (stcb->asoc.peers_rwnd > 0 || 5603 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5604 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5605 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5606 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5607 } 5608 #ifdef SCTP_AUDITING_ENABLED 5609 sctp_audit_log(0xE0, 3); 5610 sctp_auditing(2, inp, stcb, net); 5611 #endif 5612 out: 5613 if (stcb != NULL) { 5614 SCTP_TCB_UNLOCK(stcb); 5615 } 5616 if (inp_decr != NULL) { 5617 /* reduce ref-count */ 5618 SCTP_INP_WLOCK(inp_decr); 5619 SCTP_INP_DECR_REF(inp_decr); 5620 SCTP_INP_WUNLOCK(inp_decr); 5621 } 5622 return; 5623 } 5624 5625 #ifdef INET 5626 void 5627 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5628 { 5629 struct mbuf *m; 5630 int iphlen; 5631 uint32_t vrf_id = 0; 5632 uint8_t ecn_bits; 5633 struct sockaddr_in src, dst; 5634 struct ip *ip; 5635 struct sctphdr *sh; 5636 struct sctp_chunkhdr *ch; 5637 int length, offset; 5638 uint8_t compute_crc; 5639 uint32_t mflowid; 5640 uint8_t mflowtype; 5641 uint16_t fibnum; 5642 5643 iphlen = off; 5644 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5645 SCTP_RELEASE_PKT(i_pak); 5646 return; 5647 } 5648 m = SCTP_HEADER_TO_CHAIN(i_pak); 5649 #ifdef SCTP_MBUF_LOGGING 5650 /* Log in any input mbufs */ 5651 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5652 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5653 } 5654 #endif 5655 #ifdef SCTP_PACKET_LOGGING 5656 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5657 sctp_packet_log(m); 5658 } 5659 #endif 5660 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5661 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5662 m->m_pkthdr.len, 5663 if_name(m->m_pkthdr.rcvif), 5664 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5665 mflowid = m->m_pkthdr.flowid; 5666 mflowtype = M_HASHTYPE_GET(m); 5667 fibnum = M_GETFIB(m); 5668 SCTP_STAT_INCR(sctps_recvpackets); 5669 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5670 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5671 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5672 if (SCTP_BUF_LEN(m) < offset) { 5673 if ((m = m_pullup(m, offset)) == NULL) { 5674 SCTP_STAT_INCR(sctps_hdrops); 5675 return; 5676 } 5677 } 5678 ip = mtod(m, struct ip *); 5679 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5680 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5681 offset -= sizeof(struct sctp_chunkhdr); 5682 memset(&src, 0, sizeof(struct sockaddr_in)); 5683 src.sin_family = AF_INET; 5684 src.sin_len = sizeof(struct sockaddr_in); 5685 src.sin_port = sh->src_port; 5686 src.sin_addr = ip->ip_src; 5687 memset(&dst, 0, sizeof(struct sockaddr_in)); 5688 dst.sin_family = AF_INET; 5689 dst.sin_len = sizeof(struct sockaddr_in); 5690 dst.sin_port = sh->dest_port; 5691 dst.sin_addr = ip->ip_dst; 5692 length = ntohs(ip->ip_len); 5693 /* Validate mbuf chain length with IP payload length. */ 5694 if (SCTP_HEADER_LEN(m) != length) { 5695 SCTPDBG(SCTP_DEBUG_INPUT1, 5696 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5697 SCTP_STAT_INCR(sctps_hdrops); 5698 goto out; 5699 } 5700 /* SCTP does not allow broadcasts or multicasts */ 5701 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5702 goto out; 5703 } 5704 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5705 goto out; 5706 } 5707 ecn_bits = ip->ip_tos; 5708 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5709 SCTP_STAT_INCR(sctps_recvhwcrc); 5710 compute_crc = 0; 5711 } else { 5712 SCTP_STAT_INCR(sctps_recvswcrc); 5713 compute_crc = 1; 5714 } 5715 sctp_common_input_processing(&m, iphlen, offset, length, 5716 (struct sockaddr *)&src, 5717 (struct sockaddr *)&dst, 5718 sh, ch, 5719 compute_crc, 5720 ecn_bits, 5721 mflowtype, mflowid, fibnum, 5722 vrf_id, port); 5723 out: 5724 if (m) { 5725 sctp_m_freem(m); 5726 } 5727 return; 5728 } 5729 5730 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5731 extern int *sctp_cpuarry; 5732 #endif 5733 5734 int 5735 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5736 { 5737 struct mbuf *m; 5738 int off; 5739 5740 m = *mp; 5741 off = *offp; 5742 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5743 if (mp_ncpus > 1) { 5744 struct ip *ip; 5745 struct sctphdr *sh; 5746 int offset; 5747 int cpu_to_use; 5748 uint32_t flowid, tag; 5749 5750 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5751 flowid = m->m_pkthdr.flowid; 5752 } else { 5753 /* 5754 * No flow id built by lower layers fix it so we 5755 * create one. 5756 */ 5757 offset = off + sizeof(struct sctphdr); 5758 if (SCTP_BUF_LEN(m) < offset) { 5759 if ((m = m_pullup(m, offset)) == NULL) { 5760 SCTP_STAT_INCR(sctps_hdrops); 5761 return (IPPROTO_DONE); 5762 } 5763 } 5764 ip = mtod(m, struct ip *); 5765 sh = (struct sctphdr *)((caddr_t)ip + off); 5766 tag = htonl(sh->v_tag); 5767 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5768 m->m_pkthdr.flowid = flowid; 5769 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5770 } 5771 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5772 sctp_queue_to_mcore(m, off, cpu_to_use); 5773 return (IPPROTO_DONE); 5774 } 5775 #endif 5776 sctp_input_with_port(m, off, 0); 5777 return (IPPROTO_DONE); 5778 } 5779 #endif 5780