1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 static void 59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 60 { 61 struct sctp_nets *net; 62 63 /* 64 * This now not only stops all cookie timers it also stops any INIT 65 * timers as well. This will make sure that the timers are stopped 66 * in all collision cases. 67 */ 68 SCTP_TCB_LOCK_ASSERT(stcb); 69 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 70 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 71 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 72 stcb->sctp_ep, 73 stcb, 74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 75 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 76 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 77 stcb->sctp_ep, 78 stcb, 79 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 80 } 81 } 82 } 83 84 /* INIT handler */ 85 static void 86 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 87 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 88 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 89 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 90 uint8_t mflowtype, uint32_t mflowid, 91 uint32_t vrf_id, uint16_t port) 92 { 93 struct sctp_init *init; 94 struct mbuf *op_err; 95 96 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 97 (void *)stcb); 98 if (stcb == NULL) { 99 SCTP_INP_RLOCK(inp); 100 } 101 /* validate length */ 102 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 103 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 104 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 105 mflowtype, mflowid, 106 vrf_id, port); 107 if (stcb) 108 *abort_no_unlock = 1; 109 goto outnow; 110 } 111 /* validate parameters */ 112 init = &cp->init; 113 if (init->initiate_tag == 0) { 114 /* protocol error... send abort */ 115 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 116 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 117 mflowtype, mflowid, 118 vrf_id, port); 119 if (stcb) 120 *abort_no_unlock = 1; 121 goto outnow; 122 } 123 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 124 /* invalid parameter... send abort */ 125 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 126 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 127 mflowtype, mflowid, 128 vrf_id, port); 129 if (stcb) 130 *abort_no_unlock = 1; 131 goto outnow; 132 } 133 if (init->num_inbound_streams == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 136 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 137 mflowtype, mflowid, 138 vrf_id, port); 139 if (stcb) 140 *abort_no_unlock = 1; 141 goto outnow; 142 } 143 if (init->num_outbound_streams == 0) { 144 /* protocol error... send abort */ 145 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 146 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 147 mflowtype, mflowid, 148 vrf_id, port); 149 if (stcb) 150 *abort_no_unlock = 1; 151 goto outnow; 152 } 153 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 154 offset + ntohs(cp->ch.chunk_length))) { 155 /* auth parameter(s) error... send abort */ 156 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 157 "Problem with AUTH parameters"); 158 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 159 mflowtype, mflowid, 160 vrf_id, port); 161 if (stcb) 162 *abort_no_unlock = 1; 163 goto outnow; 164 } 165 /* We are only accepting if we have a listening socket. */ 166 if ((stcb == NULL) && 167 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 168 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 169 (!SCTP_IS_LISTENING(inp)))) { 170 /* 171 * FIX ME ?? What about TCP model and we have a 172 * match/restart case? Actually no fix is needed. the lookup 173 * will always find the existing assoc so stcb would not be 174 * NULL. It may be questionable to do this since we COULD 175 * just send back the INIT-ACK and hope that the app did 176 * accept()'s by the time the COOKIE was sent. But there is 177 * a price to pay for COOKIE generation and I don't want to 178 * pay it on the chance that the app will actually do some 179 * accepts(). The App just looses and should NOT be in this 180 * state :-) 181 */ 182 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 183 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 184 "No listener"); 185 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 186 mflowtype, mflowid, inp->fibnum, 187 vrf_id, port); 188 } 189 goto outnow; 190 } 191 if ((stcb != NULL) && 192 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 193 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 194 sctp_send_shutdown_ack(stcb, NULL); 195 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 196 } else { 197 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 198 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 199 src, dst, sh, cp, 200 mflowtype, mflowid, 201 vrf_id, port); 202 } 203 outnow: 204 if (stcb == NULL) { 205 SCTP_INP_RUNLOCK(inp); 206 } 207 } 208 209 /* 210 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 211 */ 212 213 int 214 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 215 { 216 int unsent_data; 217 unsigned int i; 218 struct sctp_stream_queue_pending *sp; 219 struct sctp_association *asoc; 220 221 /* 222 * This function returns if any stream has true unsent data on it. 223 * Note that as it looks through it will clean up any places that 224 * have old data that has been sent but left at top of stream queue. 225 */ 226 asoc = &stcb->asoc; 227 unsent_data = 0; 228 SCTP_TCB_SEND_LOCK(stcb); 229 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 230 /* Check to see if some data queued */ 231 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 232 /* sa_ignore FREED_MEMORY */ 233 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 234 if (sp == NULL) { 235 continue; 236 } 237 if ((sp->msg_is_complete) && 238 (sp->length == 0) && 239 (sp->sender_all_done)) { 240 /* 241 * We are doing differed cleanup. Last time 242 * through when we took all the data the 243 * sender_all_done was not set. 244 */ 245 if (sp->put_last_out == 0) { 246 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 247 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 248 sp->sender_all_done, 249 sp->length, 250 sp->msg_is_complete, 251 sp->put_last_out); 252 } 253 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 254 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 255 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 256 if (sp->net) { 257 sctp_free_remote_addr(sp->net); 258 sp->net = NULL; 259 } 260 if (sp->data) { 261 sctp_m_freem(sp->data); 262 sp->data = NULL; 263 } 264 sctp_free_a_strmoq(stcb, sp, so_locked); 265 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 266 unsent_data++; 267 } 268 } else { 269 unsent_data++; 270 } 271 if (unsent_data > 0) { 272 break; 273 } 274 } 275 } 276 SCTP_TCB_SEND_UNLOCK(stcb); 277 return (unsent_data); 278 } 279 280 static int 281 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 282 { 283 struct sctp_init *init; 284 struct sctp_association *asoc; 285 struct sctp_nets *lnet; 286 unsigned int i; 287 288 init = &cp->init; 289 asoc = &stcb->asoc; 290 /* save off parameters */ 291 asoc->peer_vtag = ntohl(init->initiate_tag); 292 asoc->peers_rwnd = ntohl(init->a_rwnd); 293 /* init tsn's */ 294 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 295 296 if (!TAILQ_EMPTY(&asoc->nets)) { 297 /* update any ssthresh's that may have a default */ 298 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 299 lnet->ssthresh = asoc->peers_rwnd; 300 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 301 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 302 } 303 } 304 } 305 SCTP_TCB_SEND_LOCK(stcb); 306 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 307 unsigned int newcnt; 308 struct sctp_stream_out *outs; 309 struct sctp_stream_queue_pending *sp, *nsp; 310 struct sctp_tmit_chunk *chk, *nchk; 311 312 /* abandon the upper streams */ 313 newcnt = ntohs(init->num_inbound_streams); 314 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 315 if (chk->rec.data.sid >= newcnt) { 316 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 317 asoc->send_queue_cnt--; 318 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 319 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 320 #ifdef INVARIANTS 321 } else { 322 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 323 #endif 324 } 325 if (chk->data != NULL) { 326 sctp_free_bufspace(stcb, asoc, chk, 1); 327 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 328 0, chk, SCTP_SO_NOT_LOCKED); 329 if (chk->data) { 330 sctp_m_freem(chk->data); 331 chk->data = NULL; 332 } 333 } 334 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 335 /* sa_ignore FREED_MEMORY */ 336 } 337 } 338 if (asoc->strmout) { 339 for (i = newcnt; i < asoc->pre_open_streams; i++) { 340 outs = &asoc->strmout[i]; 341 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 342 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 343 TAILQ_REMOVE(&outs->outqueue, sp, next); 344 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 345 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 346 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 347 if (sp->data) { 348 sctp_m_freem(sp->data); 349 sp->data = NULL; 350 } 351 if (sp->net) { 352 sctp_free_remote_addr(sp->net); 353 sp->net = NULL; 354 } 355 /* Free the chunk */ 356 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 357 /* sa_ignore FREED_MEMORY */ 358 } 359 outs->state = SCTP_STREAM_CLOSED; 360 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->streamoutcnt = asoc->pre_open_streams; 367 if (asoc->strmout) { 368 for (i = 0; i < asoc->streamoutcnt; i++) { 369 asoc->strmout[i].state = SCTP_STREAM_OPEN; 370 } 371 } 372 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 373 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 374 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 375 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 376 } 377 /* This is the next one we expect */ 378 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 379 380 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 381 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 382 383 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 384 /* open the requested streams */ 385 386 if (asoc->strmin != NULL) { 387 /* Free the old ones */ 388 for (i = 0; i < asoc->streamincnt; i++) { 389 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 390 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 391 } 392 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 393 } 394 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 395 asoc->streamincnt = ntohs(init->num_outbound_streams); 396 } else { 397 asoc->streamincnt = asoc->max_inbound_streams; 398 } 399 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 400 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 401 if (asoc->strmin == NULL) { 402 /* we didn't get memory for the streams! */ 403 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 404 return (-1); 405 } 406 for (i = 0; i < asoc->streamincnt; i++) { 407 asoc->strmin[i].sid = i; 408 asoc->strmin[i].last_mid_delivered = 0xffffffff; 409 TAILQ_INIT(&asoc->strmin[i].inqueue); 410 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 411 asoc->strmin[i].pd_api_started = 0; 412 asoc->strmin[i].delivery_started = 0; 413 } 414 /* 415 * load_address_from_init will put the addresses into the 416 * association when the COOKIE is processed or the INIT-ACK is 417 * processed. Both types of COOKIE's existing and new call this 418 * routine. It will remove addresses that are no longer in the 419 * association (for the restarting case where addresses are 420 * removed). Up front when the INIT arrives we will discard it if it 421 * is a restart and new addresses have been added. 422 */ 423 /* sa_ignore MEMLEAK */ 424 return (0); 425 } 426 427 /* 428 * INIT-ACK message processing/consumption returns value < 0 on error 429 */ 430 static int 431 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 432 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 433 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 434 struct sctp_nets *net, int *abort_no_unlock, 435 uint8_t mflowtype, uint32_t mflowid, 436 uint32_t vrf_id) 437 { 438 struct sctp_association *asoc; 439 struct mbuf *op_err; 440 int retval, abort_flag, cookie_found; 441 int initack_limit; 442 int nat_friendly = 0; 443 444 /* First verify that we have no illegal param's */ 445 abort_flag = 0; 446 cookie_found = 0; 447 448 op_err = sctp_arethere_unrecognized_parameters(m, 449 (offset + sizeof(struct sctp_init_chunk)), 450 &abort_flag, (struct sctp_chunkhdr *)cp, 451 &nat_friendly, &cookie_found); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 if (!cookie_found) { 459 uint16_t len; 460 461 /* Only report the missing cookie parameter */ 462 if (op_err != NULL) { 463 sctp_m_freem(op_err); 464 } 465 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 466 /* We abort with an error of missing mandatory param */ 467 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 468 if (op_err != NULL) { 469 struct sctp_error_missing_param *cause; 470 471 SCTP_BUF_LEN(op_err) = len; 472 cause = mtod(op_err, struct sctp_error_missing_param *); 473 /* Subtract the reserved param */ 474 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 475 cause->cause.length = htons(len); 476 cause->num_missing_params = htonl(1); 477 cause->type[0] = htons(SCTP_STATE_COOKIE); 478 } 479 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 480 src, dst, sh, op_err, 481 mflowtype, mflowid, 482 vrf_id, net->port); 483 *abort_no_unlock = 1; 484 return (-3); 485 } 486 asoc = &stcb->asoc; 487 asoc->peer_supports_nat = (uint8_t)nat_friendly; 488 /* process the peer's parameters in the INIT-ACK */ 489 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 490 if (retval < 0) { 491 if (op_err != NULL) { 492 sctp_m_freem(op_err); 493 } 494 return (retval); 495 } 496 initack_limit = offset + ntohs(cp->ch.chunk_length); 497 /* load all addresses */ 498 if ((retval = sctp_load_addresses_from_init(stcb, m, 499 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 500 src, dst, NULL, stcb->asoc.port))) { 501 if (op_err != NULL) { 502 sctp_m_freem(op_err); 503 } 504 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 505 "Problem with address parameters"); 506 SCTPDBG(SCTP_DEBUG_INPUT1, 507 "Load addresses from INIT causes an abort %d\n", 508 retval); 509 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 510 src, dst, sh, op_err, 511 mflowtype, mflowid, 512 vrf_id, net->port); 513 *abort_no_unlock = 1; 514 return (-1); 515 } 516 /* if the peer doesn't support asconf, flush the asconf queue */ 517 if (asoc->asconf_supported == 0) { 518 struct sctp_asconf_addr *param, *nparam; 519 520 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 521 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 522 SCTP_FREE(param, SCTP_M_ASC_ADDR); 523 } 524 } 525 526 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 527 stcb->asoc.local_hmacs); 528 if (op_err) { 529 sctp_queue_op_err(stcb, op_err); 530 /* queuing will steal away the mbuf chain to the out queue */ 531 op_err = NULL; 532 } 533 /* extract the cookie and queue it to "echo" it back... */ 534 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 535 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 536 stcb->asoc.overall_error_count, 537 0, 538 SCTP_FROM_SCTP_INPUT, 539 __LINE__); 540 } 541 stcb->asoc.overall_error_count = 0; 542 net->error_count = 0; 543 544 /* 545 * Cancel the INIT timer, We do this first before queueing the 546 * cookie. We always cancel at the primary to assue that we are 547 * canceling the timer started by the INIT which always goes to the 548 * primary. 549 */ 550 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 551 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 552 553 /* calculate the RTO */ 554 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 555 SCTP_RTT_FROM_NON_DATA); 556 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 557 return (retval); 558 } 559 560 static void 561 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 562 struct sctp_tcb *stcb, struct sctp_nets *net) 563 { 564 union sctp_sockstore store; 565 struct sctp_nets *r_net, *f_net; 566 struct timeval tv; 567 int req_prim = 0; 568 uint16_t old_error_counter; 569 570 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 571 /* Invalid length */ 572 return; 573 } 574 575 memset(&store, 0, sizeof(store)); 576 switch (cp->heartbeat.hb_info.addr_family) { 577 #ifdef INET 578 case AF_INET: 579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 582 store.sin.sin_port = stcb->rport; 583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 584 sizeof(store.sin.sin_addr)); 585 } else { 586 return; 587 } 588 break; 589 #endif 590 #ifdef INET6 591 case AF_INET6: 592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 595 store.sin6.sin6_port = stcb->rport; 596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 597 } else { 598 return; 599 } 600 break; 601 #endif 602 default: 603 return; 604 } 605 r_net = sctp_findnet(stcb, &store.sa); 606 if (r_net == NULL) { 607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 608 return; 609 } 610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 613 /* 614 * If the its a HB and it's random value is correct when can 615 * confirm the destination. 616 */ 617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 619 stcb->asoc.primary_destination = r_net; 620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 621 f_net = TAILQ_FIRST(&stcb->asoc.nets); 622 if (f_net != r_net) { 623 /* 624 * first one on the list is NOT the primary 625 * sctp_cmpaddr() is much more efficient if 626 * the primary is the first on the list, 627 * make it so. 628 */ 629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 631 } 632 req_prim = 1; 633 } 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 637 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 638 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 639 } 640 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 641 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 642 stcb->asoc.overall_error_count, 643 0, 644 SCTP_FROM_SCTP_INPUT, 645 __LINE__); 646 } 647 stcb->asoc.overall_error_count = 0; 648 old_error_counter = r_net->error_count; 649 r_net->error_count = 0; 650 r_net->hb_responded = 1; 651 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 652 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 653 /* Now lets do a RTO with this */ 654 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 655 SCTP_RTT_FROM_NON_DATA); 656 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 657 r_net->dest_state |= SCTP_ADDR_REACHABLE; 658 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 659 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 660 } 661 if (r_net->dest_state & SCTP_ADDR_PF) { 662 r_net->dest_state &= ~SCTP_ADDR_PF; 663 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 664 } 665 if (old_error_counter > 0) { 666 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 667 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 668 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 669 } 670 if (r_net == stcb->asoc.primary_destination) { 671 if (stcb->asoc.alternate) { 672 /* release the alternate, primary is good */ 673 sctp_free_remote_addr(stcb->asoc.alternate); 674 stcb->asoc.alternate = NULL; 675 } 676 } 677 /* Mobility adaptation */ 678 if (req_prim) { 679 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 680 SCTP_MOBILITY_BASE) || 681 sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_FASTHANDOFF)) && 683 sctp_is_mobility_feature_on(stcb->sctp_ep, 684 SCTP_MOBILITY_PRIM_DELETED)) { 685 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 686 stcb->sctp_ep, stcb, NULL, 687 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 688 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 689 SCTP_MOBILITY_FASTHANDOFF)) { 690 sctp_assoc_immediate_retrans(stcb, 691 stcb->asoc.primary_destination); 692 } 693 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 694 SCTP_MOBILITY_BASE)) { 695 sctp_move_chunks_from_net(stcb, 696 stcb->asoc.deleted_primary); 697 } 698 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 699 } 700 } 701 } 702 703 static int 704 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 705 { 706 /* 707 * Return 0 means we want you to proceed with the abort non-zero 708 * means no abort processing. 709 */ 710 uint32_t new_vtag; 711 struct sctpasochead *head; 712 713 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 714 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 715 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 716 atomic_add_int(&stcb->asoc.refcnt, 1); 717 SCTP_TCB_UNLOCK(stcb); 718 SCTP_INP_INFO_WLOCK(); 719 SCTP_TCB_LOCK(stcb); 720 atomic_subtract_int(&stcb->asoc.refcnt, 1); 721 } else { 722 return (0); 723 } 724 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 725 /* generate a new vtag and send init */ 726 LIST_REMOVE(stcb, sctp_asocs); 727 stcb->asoc.my_vtag = new_vtag; 728 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 729 /* 730 * put it in the bucket in the vtag hash of assoc's for the 731 * system 732 */ 733 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 734 SCTP_INP_INFO_WUNLOCK(); 735 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 736 return (1); 737 } else { 738 /* 739 * treat like a case where the cookie expired i.e.: - dump 740 * current cookie. - generate a new vtag. - resend init. 741 */ 742 /* generate a new vtag and send init */ 743 LIST_REMOVE(stcb, sctp_asocs); 744 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 745 sctp_stop_all_cookie_timers(stcb); 746 sctp_toss_old_cookies(stcb, &stcb->asoc); 747 stcb->asoc.my_vtag = new_vtag; 748 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 749 /* 750 * put it in the bucket in the vtag hash of assoc's for the 751 * system 752 */ 753 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 754 SCTP_INP_INFO_WUNLOCK(); 755 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 756 return (1); 757 } 758 return (0); 759 } 760 761 static int 762 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 763 struct sctp_nets *net) 764 { 765 /* 766 * return 0 means we want you to proceed with the abort non-zero 767 * means no abort processing 768 */ 769 if (stcb->asoc.auth_supported == 0) { 770 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 771 return (0); 772 } 773 sctp_asconf_send_nat_state_update(stcb, net); 774 return (1); 775 } 776 777 /* Returns 1 if the stcb was aborted, 0 otherwise */ 778 static int 779 sctp_handle_abort(struct sctp_abort_chunk *abort, 780 struct sctp_tcb *stcb, struct sctp_nets *net) 781 { 782 uint16_t len; 783 uint16_t error; 784 785 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 786 if (stcb == NULL) 787 return (0); 788 789 len = ntohs(abort->ch.chunk_length); 790 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 791 /* 792 * Need to check the cause codes for our two magic nat 793 * aborts which don't kill the assoc necessarily. 794 */ 795 struct sctp_error_cause *cause; 796 797 cause = (struct sctp_error_cause *)(abort + 1); 798 error = ntohs(cause->code); 799 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 800 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 801 abort->ch.chunk_flags); 802 if (sctp_handle_nat_colliding_state(stcb)) { 803 return (0); 804 } 805 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 806 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 807 abort->ch.chunk_flags); 808 if (sctp_handle_nat_missing_state(stcb, net)) { 809 return (0); 810 } 811 } 812 } else { 813 error = 0; 814 } 815 /* stop any receive timers */ 816 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 817 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 818 /* notify user of the abort and clean up... */ 819 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 820 /* free the tcb */ 821 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 822 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 823 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 824 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 825 } 826 #ifdef SCTP_ASOCLOG_OF_TSNS 827 sctp_print_out_track_log(stcb); 828 #endif 829 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 830 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 831 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 832 return (1); 833 } 834 835 static void 836 sctp_start_net_timers(struct sctp_tcb *stcb) 837 { 838 uint32_t cnt_hb_sent; 839 struct sctp_nets *net; 840 841 cnt_hb_sent = 0; 842 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 843 /* 844 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 845 * If the dest in unconfirmed send a hb as well if under 846 * max_hb_burst have been sent. 847 */ 848 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 849 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 850 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 851 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 852 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 853 cnt_hb_sent++; 854 } 855 } 856 if (cnt_hb_sent) { 857 sctp_chunk_output(stcb->sctp_ep, stcb, 858 SCTP_OUTPUT_FROM_COOKIE_ACK, 859 SCTP_SO_NOT_LOCKED); 860 } 861 } 862 863 static void 864 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 865 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 866 { 867 struct sctp_association *asoc; 868 int some_on_streamwheel; 869 int old_state; 870 871 SCTPDBG(SCTP_DEBUG_INPUT2, 872 "sctp_handle_shutdown: handling SHUTDOWN\n"); 873 if (stcb == NULL) 874 return; 875 asoc = &stcb->asoc; 876 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 877 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 878 return; 879 } 880 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 881 /* Shutdown NOT the expected size */ 882 return; 883 } 884 old_state = SCTP_GET_STATE(stcb); 885 sctp_update_acked(stcb, cp, abort_flag); 886 if (*abort_flag) { 887 return; 888 } 889 if (asoc->control_pdapi) { 890 /* 891 * With a normal shutdown we assume the end of last record. 892 */ 893 SCTP_INP_READ_LOCK(stcb->sctp_ep); 894 if (asoc->control_pdapi->on_strm_q) { 895 struct sctp_stream_in *strm; 896 897 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 898 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 899 /* Unordered */ 900 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 901 asoc->control_pdapi->on_strm_q = 0; 902 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 903 /* Ordered */ 904 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 905 asoc->control_pdapi->on_strm_q = 0; 906 #ifdef INVARIANTS 907 } else { 908 panic("Unknown state on ctrl:%p on_strm_q:%d", 909 asoc->control_pdapi, 910 asoc->control_pdapi->on_strm_q); 911 #endif 912 } 913 } 914 asoc->control_pdapi->end_added = 1; 915 asoc->control_pdapi->pdapi_aborted = 1; 916 asoc->control_pdapi = NULL; 917 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 918 if (stcb->sctp_socket) { 919 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 920 } 921 } 922 /* goto SHUTDOWN_RECEIVED state to block new requests */ 923 if (stcb->sctp_socket) { 924 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 925 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 926 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 927 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 928 /* 929 * notify upper layer that peer has initiated a 930 * shutdown 931 */ 932 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 933 934 /* reset time */ 935 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 936 } 937 } 938 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 939 /* 940 * stop the shutdown timer, since we WILL move to 941 * SHUTDOWN-ACK-SENT. 942 */ 943 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 944 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 945 } 946 /* Now is there unsent data on a stream somewhere? */ 947 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 948 949 if (!TAILQ_EMPTY(&asoc->send_queue) || 950 !TAILQ_EMPTY(&asoc->sent_queue) || 951 some_on_streamwheel) { 952 /* By returning we will push more data out */ 953 return; 954 } else { 955 /* no outstanding data to send, so move on... */ 956 /* send SHUTDOWN-ACK */ 957 /* move to SHUTDOWN-ACK-SENT state */ 958 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 959 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 960 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 961 } 962 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 963 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 964 sctp_stop_timers_for_shutdown(stcb); 965 sctp_send_shutdown_ack(stcb, net); 966 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 967 stcb->sctp_ep, stcb, net); 968 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 969 sctp_send_shutdown_ack(stcb, net); 970 } 971 } 972 } 973 974 static void 975 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 976 struct sctp_tcb *stcb, 977 struct sctp_nets *net) 978 { 979 struct sctp_association *asoc; 980 981 SCTPDBG(SCTP_DEBUG_INPUT2, 982 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 983 if (stcb == NULL) 984 return; 985 986 asoc = &stcb->asoc; 987 /* process according to association state */ 988 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 989 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 990 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 991 sctp_send_shutdown_complete(stcb, net, 1); 992 SCTP_TCB_UNLOCK(stcb); 993 return; 994 } 995 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 996 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 997 /* unexpected SHUTDOWN-ACK... so ignore... */ 998 SCTP_TCB_UNLOCK(stcb); 999 return; 1000 } 1001 if (asoc->control_pdapi) { 1002 /* 1003 * With a normal shutdown we assume the end of last record. 1004 */ 1005 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1006 asoc->control_pdapi->end_added = 1; 1007 asoc->control_pdapi->pdapi_aborted = 1; 1008 asoc->control_pdapi = NULL; 1009 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1010 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1011 } 1012 #ifdef INVARIANTS 1013 if (!TAILQ_EMPTY(&asoc->send_queue) || 1014 !TAILQ_EMPTY(&asoc->sent_queue) || 1015 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1016 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1017 } 1018 #endif 1019 /* stop the timer */ 1020 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1021 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1022 /* send SHUTDOWN-COMPLETE */ 1023 sctp_send_shutdown_complete(stcb, net, 0); 1024 /* notify upper layer protocol */ 1025 if (stcb->sctp_socket) { 1026 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1027 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1028 stcb->sctp_socket->so_snd.sb_cc = 0; 1029 } 1030 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1031 } 1032 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1033 /* free the TCB but first save off the ep */ 1034 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1035 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1036 } 1037 1038 static void 1039 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1040 { 1041 switch (chunk_type) { 1042 case SCTP_ASCONF_ACK: 1043 case SCTP_ASCONF: 1044 sctp_asconf_cleanup(stcb); 1045 break; 1046 case SCTP_IFORWARD_CUM_TSN: 1047 case SCTP_FORWARD_CUM_TSN: 1048 stcb->asoc.prsctp_supported = 0; 1049 break; 1050 default: 1051 SCTPDBG(SCTP_DEBUG_INPUT2, 1052 "Peer does not support chunk type %d (0x%x).\n", 1053 chunk_type, chunk_type); 1054 break; 1055 } 1056 } 1057 1058 /* 1059 * Skip past the param header and then we will find the param that caused the 1060 * problem. There are a number of param's in a ASCONF OR the prsctp param 1061 * these will turn of specific features. 1062 * XXX: Is this the right thing to do? 1063 */ 1064 static void 1065 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1066 { 1067 switch (parameter_type) { 1068 /* pr-sctp draft */ 1069 case SCTP_PRSCTP_SUPPORTED: 1070 stcb->asoc.prsctp_supported = 0; 1071 break; 1072 case SCTP_SUPPORTED_CHUNK_EXT: 1073 break; 1074 /* draft-ietf-tsvwg-addip-sctp */ 1075 case SCTP_HAS_NAT_SUPPORT: 1076 stcb->asoc.peer_supports_nat = 0; 1077 break; 1078 case SCTP_ADD_IP_ADDRESS: 1079 case SCTP_DEL_IP_ADDRESS: 1080 case SCTP_SET_PRIM_ADDR: 1081 stcb->asoc.asconf_supported = 0; 1082 break; 1083 case SCTP_SUCCESS_REPORT: 1084 case SCTP_ERROR_CAUSE_IND: 1085 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1086 SCTPDBG(SCTP_DEBUG_INPUT2, 1087 "Turning off ASCONF to this strange peer\n"); 1088 stcb->asoc.asconf_supported = 0; 1089 break; 1090 default: 1091 SCTPDBG(SCTP_DEBUG_INPUT2, 1092 "Peer does not support param type %d (0x%x)??\n", 1093 parameter_type, parameter_type); 1094 break; 1095 } 1096 } 1097 1098 static int 1099 sctp_handle_error(struct sctp_chunkhdr *ch, 1100 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1101 { 1102 struct sctp_error_cause *cause; 1103 struct sctp_association *asoc; 1104 uint32_t remaining_length, adjust; 1105 uint16_t code, cause_code, cause_length; 1106 1107 /* parse through all of the errors and process */ 1108 asoc = &stcb->asoc; 1109 cause = (struct sctp_error_cause *)((caddr_t)ch + 1110 sizeof(struct sctp_chunkhdr)); 1111 remaining_length = ntohs(ch->chunk_length); 1112 if (remaining_length > limit) { 1113 remaining_length = limit; 1114 } 1115 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1116 remaining_length -= sizeof(struct sctp_chunkhdr); 1117 } else { 1118 remaining_length = 0; 1119 } 1120 code = 0; 1121 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1122 /* Process an Error Cause */ 1123 cause_code = ntohs(cause->code); 1124 cause_length = ntohs(cause->length); 1125 if ((cause_length > remaining_length) || (cause_length == 0)) { 1126 /* Invalid cause length, possibly due to truncation. */ 1127 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1128 remaining_length, cause_length); 1129 return (0); 1130 } 1131 if (code == 0) { 1132 /* report the first error cause */ 1133 code = cause_code; 1134 } 1135 switch (cause_code) { 1136 case SCTP_CAUSE_INVALID_STREAM: 1137 case SCTP_CAUSE_MISSING_PARAM: 1138 case SCTP_CAUSE_INVALID_PARAM: 1139 case SCTP_CAUSE_NO_USER_DATA: 1140 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1141 cause_code); 1142 break; 1143 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1144 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1145 ch->chunk_flags); 1146 if (sctp_handle_nat_colliding_state(stcb)) { 1147 return (0); 1148 } 1149 break; 1150 case SCTP_CAUSE_NAT_MISSING_STATE: 1151 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1152 ch->chunk_flags); 1153 if (sctp_handle_nat_missing_state(stcb, net)) { 1154 return (0); 1155 } 1156 break; 1157 case SCTP_CAUSE_STALE_COOKIE: 1158 /* 1159 * We only act if we have echoed a cookie and are 1160 * waiting. 1161 */ 1162 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1163 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1164 struct sctp_error_stale_cookie *stale_cookie; 1165 1166 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1167 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1168 /* Double it to be more robust on RTX */ 1169 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1170 asoc->cookie_preserve_req *= 2; 1171 } else { 1172 asoc->cookie_preserve_req = UINT32_MAX; 1173 } 1174 asoc->stale_cookie_count++; 1175 if (asoc->stale_cookie_count > 1176 asoc->max_init_times) { 1177 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1178 /* now free the asoc */ 1179 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1180 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1181 return (-1); 1182 } 1183 /* blast back to INIT state */ 1184 sctp_toss_old_cookies(stcb, &stcb->asoc); 1185 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1186 sctp_stop_all_cookie_timers(stcb); 1187 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1188 } 1189 break; 1190 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1191 /* 1192 * Nothing we can do here, we don't do hostname 1193 * addresses so if the peer does not like my IPv6 1194 * (or IPv4 for that matter) it does not matter. If 1195 * they don't support that type of address, they can 1196 * NOT possibly get that packet type... i.e. with no 1197 * IPv6 you can't receive a IPv6 packet. so we can 1198 * safely ignore this one. If we ever added support 1199 * for HOSTNAME Addresses, then we would need to do 1200 * something here. 1201 */ 1202 break; 1203 case SCTP_CAUSE_UNRECOG_CHUNK: 1204 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1205 struct sctp_error_unrecognized_chunk *unrec_chunk; 1206 1207 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1208 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1209 } 1210 break; 1211 case SCTP_CAUSE_UNRECOG_PARAM: 1212 /* XXX: We only consider the first parameter */ 1213 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1214 struct sctp_paramhdr *unrec_parameter; 1215 1216 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1217 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1218 } 1219 break; 1220 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1221 /* 1222 * We ignore this since the timer will drive out a 1223 * new cookie anyway and there timer will drive us 1224 * to send a SHUTDOWN_COMPLETE. We can't send one 1225 * here since we don't have their tag. 1226 */ 1227 break; 1228 case SCTP_CAUSE_DELETING_LAST_ADDR: 1229 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1230 case SCTP_CAUSE_DELETING_SRC_ADDR: 1231 /* 1232 * We should NOT get these here, but in a 1233 * ASCONF-ACK. 1234 */ 1235 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1236 cause_code); 1237 break; 1238 case SCTP_CAUSE_OUT_OF_RESC: 1239 /* 1240 * And what, pray tell do we do with the fact that 1241 * the peer is out of resources? Not really sure we 1242 * could do anything but abort. I suspect this 1243 * should have came WITH an abort instead of in a 1244 * OP-ERROR. 1245 */ 1246 break; 1247 default: 1248 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1249 cause_code); 1250 break; 1251 } 1252 adjust = SCTP_SIZE32(cause_length); 1253 if (remaining_length >= adjust) { 1254 remaining_length -= adjust; 1255 } else { 1256 remaining_length = 0; 1257 } 1258 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1259 } 1260 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1261 return (0); 1262 } 1263 1264 static int 1265 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1266 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1267 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1268 struct sctp_nets *net, int *abort_no_unlock, 1269 uint8_t mflowtype, uint32_t mflowid, 1270 uint32_t vrf_id) 1271 { 1272 struct sctp_init_ack *init_ack; 1273 struct mbuf *op_err; 1274 1275 SCTPDBG(SCTP_DEBUG_INPUT2, 1276 "sctp_handle_init_ack: handling INIT-ACK\n"); 1277 1278 if (stcb == NULL) { 1279 SCTPDBG(SCTP_DEBUG_INPUT2, 1280 "sctp_handle_init_ack: TCB is null\n"); 1281 return (-1); 1282 } 1283 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1284 /* Invalid length */ 1285 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1286 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1287 src, dst, sh, op_err, 1288 mflowtype, mflowid, 1289 vrf_id, net->port); 1290 *abort_no_unlock = 1; 1291 return (-1); 1292 } 1293 init_ack = &cp->init; 1294 /* validate parameters */ 1295 if (init_ack->initiate_tag == 0) { 1296 /* protocol error... send an abort */ 1297 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1298 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1299 src, dst, sh, op_err, 1300 mflowtype, mflowid, 1301 vrf_id, net->port); 1302 *abort_no_unlock = 1; 1303 return (-1); 1304 } 1305 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1306 /* protocol error... send an abort */ 1307 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1308 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1309 src, dst, sh, op_err, 1310 mflowtype, mflowid, 1311 vrf_id, net->port); 1312 *abort_no_unlock = 1; 1313 return (-1); 1314 } 1315 if (init_ack->num_inbound_streams == 0) { 1316 /* protocol error... send an abort */ 1317 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1318 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1319 src, dst, sh, op_err, 1320 mflowtype, mflowid, 1321 vrf_id, net->port); 1322 *abort_no_unlock = 1; 1323 return (-1); 1324 } 1325 if (init_ack->num_outbound_streams == 0) { 1326 /* protocol error... send an abort */ 1327 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1328 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1329 src, dst, sh, op_err, 1330 mflowtype, mflowid, 1331 vrf_id, net->port); 1332 *abort_no_unlock = 1; 1333 return (-1); 1334 } 1335 /* process according to association state... */ 1336 switch (SCTP_GET_STATE(stcb)) { 1337 case SCTP_STATE_COOKIE_WAIT: 1338 /* this is the expected state for this chunk */ 1339 /* process the INIT-ACK parameters */ 1340 if (stcb->asoc.primary_destination->dest_state & 1341 SCTP_ADDR_UNCONFIRMED) { 1342 /* 1343 * The primary is where we sent the INIT, we can 1344 * always consider it confirmed when the INIT-ACK is 1345 * returned. Do this before we load addresses 1346 * though. 1347 */ 1348 stcb->asoc.primary_destination->dest_state &= 1349 ~SCTP_ADDR_UNCONFIRMED; 1350 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1351 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1352 } 1353 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1354 net, abort_no_unlock, 1355 mflowtype, mflowid, 1356 vrf_id) < 0) { 1357 /* error in parsing parameters */ 1358 return (-1); 1359 } 1360 /* update our state */ 1361 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1362 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1363 1364 /* reset the RTO calc */ 1365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1366 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1367 stcb->asoc.overall_error_count, 1368 0, 1369 SCTP_FROM_SCTP_INPUT, 1370 __LINE__); 1371 } 1372 stcb->asoc.overall_error_count = 0; 1373 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1374 /* 1375 * collapse the init timer back in case of a exponential 1376 * backoff 1377 */ 1378 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1379 stcb, net); 1380 /* 1381 * the send at the end of the inbound data processing will 1382 * cause the cookie to be sent 1383 */ 1384 break; 1385 case SCTP_STATE_SHUTDOWN_SENT: 1386 /* incorrect state... discard */ 1387 break; 1388 case SCTP_STATE_COOKIE_ECHOED: 1389 /* incorrect state... discard */ 1390 break; 1391 case SCTP_STATE_OPEN: 1392 /* incorrect state... discard */ 1393 break; 1394 case SCTP_STATE_EMPTY: 1395 case SCTP_STATE_INUSE: 1396 default: 1397 /* incorrect state... discard */ 1398 return (-1); 1399 break; 1400 } 1401 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1402 return (0); 1403 } 1404 1405 static struct sctp_tcb * 1406 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1407 struct sockaddr *src, struct sockaddr *dst, 1408 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1409 struct sctp_inpcb *inp, struct sctp_nets **netp, 1410 struct sockaddr *init_src, int *notification, 1411 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1412 uint8_t mflowtype, uint32_t mflowid, 1413 uint32_t vrf_id, uint16_t port); 1414 1415 /* 1416 * handle a state cookie for an existing association m: input packet mbuf 1417 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1418 * "split" mbuf and the cookie signature does not exist offset: offset into 1419 * mbuf to the cookie-echo chunk 1420 */ 1421 static struct sctp_tcb * 1422 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1423 struct sockaddr *src, struct sockaddr *dst, 1424 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1425 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1426 struct sockaddr *init_src, int *notification, 1427 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1428 uint8_t mflowtype, uint32_t mflowid, 1429 uint32_t vrf_id, uint16_t port) 1430 { 1431 struct sctp_association *asoc; 1432 struct sctp_init_chunk *init_cp, init_buf; 1433 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1434 struct sctp_nets *net; 1435 struct mbuf *op_err; 1436 struct timeval old; 1437 int init_offset, initack_offset, i; 1438 int retval; 1439 int spec_flag = 0; 1440 uint32_t how_indx; 1441 #if defined(SCTP_DETAILED_STR_STATS) 1442 int j; 1443 #endif 1444 1445 net = *netp; 1446 /* I know that the TCB is non-NULL from the caller */ 1447 asoc = &stcb->asoc; 1448 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1449 if (asoc->cookie_how[how_indx] == 0) 1450 break; 1451 } 1452 if (how_indx < sizeof(asoc->cookie_how)) { 1453 asoc->cookie_how[how_indx] = 1; 1454 } 1455 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1456 /* SHUTDOWN came in after sending INIT-ACK */ 1457 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1458 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1459 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1460 mflowtype, mflowid, inp->fibnum, 1461 vrf_id, net->port); 1462 if (how_indx < sizeof(asoc->cookie_how)) 1463 asoc->cookie_how[how_indx] = 2; 1464 return (NULL); 1465 } 1466 /* 1467 * find and validate the INIT chunk in the cookie (peer's info) the 1468 * INIT should start after the cookie-echo header struct (chunk 1469 * header, state cookie header struct) 1470 */ 1471 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1472 1473 init_cp = (struct sctp_init_chunk *) 1474 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1475 (uint8_t *)&init_buf); 1476 if (init_cp == NULL) { 1477 /* could not pull a INIT chunk in cookie */ 1478 return (NULL); 1479 } 1480 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1481 return (NULL); 1482 } 1483 /* 1484 * find and validate the INIT-ACK chunk in the cookie (my info) the 1485 * INIT-ACK follows the INIT chunk 1486 */ 1487 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1488 initack_cp = (struct sctp_init_ack_chunk *) 1489 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1490 (uint8_t *)&initack_buf); 1491 if (initack_cp == NULL) { 1492 /* could not pull INIT-ACK chunk in cookie */ 1493 return (NULL); 1494 } 1495 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1496 return (NULL); 1497 } 1498 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1499 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1500 /* 1501 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1502 * to get into the OPEN state 1503 */ 1504 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1505 /*- 1506 * Opps, this means that we somehow generated two vtag's 1507 * the same. I.e. we did: 1508 * Us Peer 1509 * <---INIT(tag=a)------ 1510 * ----INIT-ACK(tag=t)--> 1511 * ----INIT(tag=t)------> *1 1512 * <---INIT-ACK(tag=a)--- 1513 * <----CE(tag=t)------------- *2 1514 * 1515 * At point *1 we should be generating a different 1516 * tag t'. Which means we would throw away the CE and send 1517 * ours instead. Basically this is case C (throw away side). 1518 */ 1519 if (how_indx < sizeof(asoc->cookie_how)) 1520 asoc->cookie_how[how_indx] = 17; 1521 return (NULL); 1522 } 1523 switch (SCTP_GET_STATE(stcb)) { 1524 case SCTP_STATE_COOKIE_WAIT: 1525 case SCTP_STATE_COOKIE_ECHOED: 1526 /* 1527 * INIT was sent but got a COOKIE_ECHO with the 1528 * correct tags... just accept it...but we must 1529 * process the init so that we can make sure we have 1530 * the right seq no's. 1531 */ 1532 /* First we must process the INIT !! */ 1533 retval = sctp_process_init(init_cp, stcb); 1534 if (retval < 0) { 1535 if (how_indx < sizeof(asoc->cookie_how)) 1536 asoc->cookie_how[how_indx] = 3; 1537 return (NULL); 1538 } 1539 /* we have already processed the INIT so no problem */ 1540 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1541 stcb, net, 1542 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1543 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1544 stcb, net, 1545 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1546 /* update current state */ 1547 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1548 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1549 else 1550 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1551 1552 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1553 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1554 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1555 stcb->sctp_ep, stcb, NULL); 1556 } 1557 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1558 sctp_stop_all_cookie_timers(stcb); 1559 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1560 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1561 (!SCTP_IS_LISTENING(inp))) { 1562 /* 1563 * Here is where collision would go if we 1564 * did a connect() and instead got a 1565 * init/init-ack/cookie done before the 1566 * init-ack came back.. 1567 */ 1568 stcb->sctp_ep->sctp_flags |= 1569 SCTP_PCB_FLAGS_CONNECTED; 1570 soisconnected(stcb->sctp_socket); 1571 } 1572 /* notify upper layer */ 1573 *notification = SCTP_NOTIFY_ASSOC_UP; 1574 /* 1575 * since we did not send a HB make sure we don't 1576 * double things 1577 */ 1578 old.tv_sec = cookie->time_entered.tv_sec; 1579 old.tv_usec = cookie->time_entered.tv_usec; 1580 net->hb_responded = 1; 1581 sctp_calculate_rto(stcb, asoc, net, &old, 1582 SCTP_RTT_FROM_NON_DATA); 1583 1584 if (stcb->asoc.sctp_autoclose_ticks && 1585 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1586 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1587 inp, stcb, NULL); 1588 } 1589 break; 1590 default: 1591 /* 1592 * we're in the OPEN state (or beyond), so peer must 1593 * have simply lost the COOKIE-ACK 1594 */ 1595 break; 1596 } /* end switch */ 1597 sctp_stop_all_cookie_timers(stcb); 1598 /* 1599 * We ignore the return code here.. not sure if we should 1600 * somehow abort.. but we do have an existing asoc. This 1601 * really should not fail. 1602 */ 1603 if (sctp_load_addresses_from_init(stcb, m, 1604 init_offset + sizeof(struct sctp_init_chunk), 1605 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1606 if (how_indx < sizeof(asoc->cookie_how)) 1607 asoc->cookie_how[how_indx] = 4; 1608 return (NULL); 1609 } 1610 /* respond with a COOKIE-ACK */ 1611 sctp_toss_old_cookies(stcb, asoc); 1612 sctp_send_cookie_ack(stcb); 1613 if (how_indx < sizeof(asoc->cookie_how)) 1614 asoc->cookie_how[how_indx] = 5; 1615 return (stcb); 1616 } 1617 1618 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1619 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1620 cookie->tie_tag_my_vtag == 0 && 1621 cookie->tie_tag_peer_vtag == 0) { 1622 /* 1623 * case C in Section 5.2.4 Table 2: XMOO silently discard 1624 */ 1625 if (how_indx < sizeof(asoc->cookie_how)) 1626 asoc->cookie_how[how_indx] = 6; 1627 return (NULL); 1628 } 1629 /* 1630 * If nat support, and the below and stcb is established, send back 1631 * a ABORT(colliding state) if we are established. 1632 */ 1633 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1634 (asoc->peer_supports_nat) && 1635 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1636 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1637 (asoc->peer_vtag == 0)))) { 1638 /* 1639 * Special case - Peer's support nat. We may have two init's 1640 * that we gave out the same tag on since one was not 1641 * established.. i.e. we get INIT from host-1 behind the nat 1642 * and we respond tag-a, we get a INIT from host-2 behind 1643 * the nat and we get tag-a again. Then we bring up host-1 1644 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1645 * Now we have colliding state. We must send an abort here 1646 * with colliding state indication. 1647 */ 1648 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1649 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1650 mflowtype, mflowid, inp->fibnum, 1651 vrf_id, port); 1652 return (NULL); 1653 } 1654 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1655 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1656 (asoc->peer_vtag == 0))) { 1657 /* 1658 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1659 * should be ok, re-accept peer info 1660 */ 1661 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1662 /* 1663 * Extension of case C. If we hit this, then the 1664 * random number generator returned the same vtag 1665 * when we first sent our INIT-ACK and when we later 1666 * sent our INIT. The side with the seq numbers that 1667 * are different will be the one that normnally 1668 * would have hit case C. This in effect "extends" 1669 * our vtags in this collision case to be 64 bits. 1670 * The same collision could occur aka you get both 1671 * vtag and seq number the same twice in a row.. but 1672 * is much less likely. If it did happen then we 1673 * would proceed through and bring up the assoc.. we 1674 * may end up with the wrong stream setup however.. 1675 * which would be bad.. but there is no way to 1676 * tell.. until we send on a stream that does not 1677 * exist :-) 1678 */ 1679 if (how_indx < sizeof(asoc->cookie_how)) 1680 asoc->cookie_how[how_indx] = 7; 1681 1682 return (NULL); 1683 } 1684 if (how_indx < sizeof(asoc->cookie_how)) 1685 asoc->cookie_how[how_indx] = 8; 1686 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1687 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1688 sctp_stop_all_cookie_timers(stcb); 1689 /* 1690 * since we did not send a HB make sure we don't double 1691 * things 1692 */ 1693 net->hb_responded = 1; 1694 if (stcb->asoc.sctp_autoclose_ticks && 1695 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1696 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1697 NULL); 1698 } 1699 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1700 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1701 1702 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1703 /* 1704 * Ok the peer probably discarded our data (if we 1705 * echoed a cookie+data). So anything on the 1706 * sent_queue should be marked for retransmit, we 1707 * may not get something to kick us so it COULD 1708 * still take a timeout to move these.. but it can't 1709 * hurt to mark them. 1710 */ 1711 struct sctp_tmit_chunk *chk; 1712 1713 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1714 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1715 chk->sent = SCTP_DATAGRAM_RESEND; 1716 sctp_flight_size_decrease(chk); 1717 sctp_total_flight_decrease(stcb, chk); 1718 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1719 spec_flag++; 1720 } 1721 } 1722 } 1723 /* process the INIT info (peer's info) */ 1724 retval = sctp_process_init(init_cp, stcb); 1725 if (retval < 0) { 1726 if (how_indx < sizeof(asoc->cookie_how)) 1727 asoc->cookie_how[how_indx] = 9; 1728 return (NULL); 1729 } 1730 if (sctp_load_addresses_from_init(stcb, m, 1731 init_offset + sizeof(struct sctp_init_chunk), 1732 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1733 if (how_indx < sizeof(asoc->cookie_how)) 1734 asoc->cookie_how[how_indx] = 10; 1735 return (NULL); 1736 } 1737 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1738 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1739 *notification = SCTP_NOTIFY_ASSOC_UP; 1740 1741 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1742 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1743 (!SCTP_IS_LISTENING(inp))) { 1744 stcb->sctp_ep->sctp_flags |= 1745 SCTP_PCB_FLAGS_CONNECTED; 1746 soisconnected(stcb->sctp_socket); 1747 } 1748 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1749 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1750 else 1751 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1752 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1753 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1754 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1755 } else { 1756 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1757 } 1758 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1759 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1760 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1761 stcb->sctp_ep, stcb, NULL); 1762 } 1763 sctp_stop_all_cookie_timers(stcb); 1764 sctp_toss_old_cookies(stcb, asoc); 1765 sctp_send_cookie_ack(stcb); 1766 if (spec_flag) { 1767 /* 1768 * only if we have retrans set do we do this. What 1769 * this call does is get only the COOKIE-ACK out and 1770 * then when we return the normal call to 1771 * sctp_chunk_output will get the retrans out behind 1772 * this. 1773 */ 1774 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1775 } 1776 if (how_indx < sizeof(asoc->cookie_how)) 1777 asoc->cookie_how[how_indx] = 11; 1778 1779 return (stcb); 1780 } 1781 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1782 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1783 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1784 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1785 cookie->tie_tag_peer_vtag != 0) { 1786 struct sctpasochead *head; 1787 1788 if (asoc->peer_supports_nat) { 1789 /* 1790 * This is a gross gross hack. Just call the 1791 * cookie_new code since we are allowing a duplicate 1792 * association. I hope this works... 1793 */ 1794 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1795 sh, cookie, cookie_len, 1796 inp, netp, init_src, notification, 1797 auth_skipped, auth_offset, auth_len, 1798 mflowtype, mflowid, 1799 vrf_id, port)); 1800 } 1801 /* 1802 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1803 */ 1804 /* temp code */ 1805 if (how_indx < sizeof(asoc->cookie_how)) 1806 asoc->cookie_how[how_indx] = 12; 1807 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1808 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1809 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1810 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1811 1812 /* notify upper layer */ 1813 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1814 atomic_add_int(&stcb->asoc.refcnt, 1); 1815 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1816 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1817 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1818 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1819 } 1820 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1821 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1822 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1823 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1824 } 1825 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1826 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1827 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1828 stcb->sctp_ep, stcb, NULL); 1829 1830 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1831 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1832 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1833 } 1834 asoc->pre_open_streams = 1835 ntohs(initack_cp->init.num_outbound_streams); 1836 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1837 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1838 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1839 1840 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1841 1842 asoc->str_reset_seq_in = asoc->init_seq_number; 1843 1844 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1845 if (asoc->mapping_array) { 1846 memset(asoc->mapping_array, 0, 1847 asoc->mapping_array_size); 1848 } 1849 if (asoc->nr_mapping_array) { 1850 memset(asoc->nr_mapping_array, 0, 1851 asoc->mapping_array_size); 1852 } 1853 SCTP_TCB_UNLOCK(stcb); 1854 SCTP_INP_INFO_WLOCK(); 1855 SCTP_INP_WLOCK(stcb->sctp_ep); 1856 SCTP_TCB_LOCK(stcb); 1857 atomic_add_int(&stcb->asoc.refcnt, -1); 1858 /* send up all the data */ 1859 SCTP_TCB_SEND_LOCK(stcb); 1860 1861 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1862 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1863 stcb->asoc.strmout[i].chunks_on_queues = 0; 1864 #if defined(SCTP_DETAILED_STR_STATS) 1865 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1866 asoc->strmout[i].abandoned_sent[j] = 0; 1867 asoc->strmout[i].abandoned_unsent[j] = 0; 1868 } 1869 #else 1870 asoc->strmout[i].abandoned_sent[0] = 0; 1871 asoc->strmout[i].abandoned_unsent[0] = 0; 1872 #endif 1873 stcb->asoc.strmout[i].sid = i; 1874 stcb->asoc.strmout[i].next_mid_ordered = 0; 1875 stcb->asoc.strmout[i].next_mid_unordered = 0; 1876 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1877 } 1878 /* process the INIT-ACK info (my info) */ 1879 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1880 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1881 1882 /* pull from vtag hash */ 1883 LIST_REMOVE(stcb, sctp_asocs); 1884 /* re-insert to new vtag position */ 1885 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1886 SCTP_BASE_INFO(hashasocmark))]; 1887 /* 1888 * put it in the bucket in the vtag hash of assoc's for the 1889 * system 1890 */ 1891 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1892 1893 SCTP_TCB_SEND_UNLOCK(stcb); 1894 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1895 SCTP_INP_INFO_WUNLOCK(); 1896 asoc->total_flight = 0; 1897 asoc->total_flight_count = 0; 1898 /* process the INIT info (peer's info) */ 1899 retval = sctp_process_init(init_cp, stcb); 1900 if (retval < 0) { 1901 if (how_indx < sizeof(asoc->cookie_how)) 1902 asoc->cookie_how[how_indx] = 13; 1903 1904 return (NULL); 1905 } 1906 /* 1907 * since we did not send a HB make sure we don't double 1908 * things 1909 */ 1910 net->hb_responded = 1; 1911 1912 if (sctp_load_addresses_from_init(stcb, m, 1913 init_offset + sizeof(struct sctp_init_chunk), 1914 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1915 if (how_indx < sizeof(asoc->cookie_how)) 1916 asoc->cookie_how[how_indx] = 14; 1917 1918 return (NULL); 1919 } 1920 /* respond with a COOKIE-ACK */ 1921 sctp_stop_all_cookie_timers(stcb); 1922 sctp_toss_old_cookies(stcb, asoc); 1923 sctp_send_cookie_ack(stcb); 1924 if (how_indx < sizeof(asoc->cookie_how)) 1925 asoc->cookie_how[how_indx] = 15; 1926 1927 return (stcb); 1928 } 1929 if (how_indx < sizeof(asoc->cookie_how)) 1930 asoc->cookie_how[how_indx] = 16; 1931 /* all other cases... */ 1932 return (NULL); 1933 } 1934 1935 /* 1936 * handle a state cookie for a new association m: input packet mbuf chain-- 1937 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1938 * and the cookie signature does not exist offset: offset into mbuf to the 1939 * cookie-echo chunk length: length of the cookie chunk to: where the init 1940 * was from returns a new TCB 1941 */ 1942 static struct sctp_tcb * 1943 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1944 struct sockaddr *src, struct sockaddr *dst, 1945 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1946 struct sctp_inpcb *inp, struct sctp_nets **netp, 1947 struct sockaddr *init_src, int *notification, 1948 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1949 uint8_t mflowtype, uint32_t mflowid, 1950 uint32_t vrf_id, uint16_t port) 1951 { 1952 struct sctp_tcb *stcb; 1953 struct sctp_init_chunk *init_cp, init_buf; 1954 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1955 union sctp_sockstore store; 1956 struct sctp_association *asoc; 1957 int init_offset, initack_offset, initack_limit; 1958 int retval; 1959 int error = 0; 1960 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1961 1962 /* 1963 * find and validate the INIT chunk in the cookie (peer's info) the 1964 * INIT should start after the cookie-echo header struct (chunk 1965 * header, state cookie header struct) 1966 */ 1967 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1968 init_cp = (struct sctp_init_chunk *) 1969 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1970 (uint8_t *)&init_buf); 1971 if (init_cp == NULL) { 1972 /* could not pull a INIT chunk in cookie */ 1973 SCTPDBG(SCTP_DEBUG_INPUT1, 1974 "process_cookie_new: could not pull INIT chunk hdr\n"); 1975 return (NULL); 1976 } 1977 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1978 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1979 return (NULL); 1980 } 1981 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1982 /* 1983 * find and validate the INIT-ACK chunk in the cookie (my info) the 1984 * INIT-ACK follows the INIT chunk 1985 */ 1986 initack_cp = (struct sctp_init_ack_chunk *) 1987 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1988 (uint8_t *)&initack_buf); 1989 if (initack_cp == NULL) { 1990 /* could not pull INIT-ACK chunk in cookie */ 1991 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1992 return (NULL); 1993 } 1994 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1995 return (NULL); 1996 } 1997 /* 1998 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1999 * "initack_limit" value. This is because the chk_length field 2000 * includes the length of the cookie, but the cookie is omitted when 2001 * the INIT and INIT_ACK are tacked onto the cookie... 2002 */ 2003 initack_limit = offset + cookie_len; 2004 2005 /* 2006 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2007 * and popluate 2008 */ 2009 2010 /* 2011 * Here we do a trick, we set in NULL for the proc/thread argument. 2012 * We do this since in effect we only use the p argument when the 2013 * socket is unbound and we must do an implicit bind. Since we are 2014 * getting a cookie, we cannot be unbound. 2015 */ 2016 stcb = sctp_aloc_assoc(inp, init_src, &error, 2017 ntohl(initack_cp->init.initiate_tag), vrf_id, 2018 ntohs(initack_cp->init.num_outbound_streams), 2019 port, 2020 (struct thread *)NULL, 2021 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2022 if (stcb == NULL) { 2023 struct mbuf *op_err; 2024 2025 /* memory problem? */ 2026 SCTPDBG(SCTP_DEBUG_INPUT1, 2027 "process_cookie_new: no room for another TCB!\n"); 2028 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2029 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2030 src, dst, sh, op_err, 2031 mflowtype, mflowid, 2032 vrf_id, port); 2033 return (NULL); 2034 } 2035 asoc = &stcb->asoc; 2036 /* get scope variables out of cookie */ 2037 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2038 asoc->scope.site_scope = cookie->site_scope; 2039 asoc->scope.local_scope = cookie->local_scope; 2040 asoc->scope.loopback_scope = cookie->loopback_scope; 2041 2042 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2043 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2044 struct mbuf *op_err; 2045 2046 /* 2047 * Houston we have a problem. The EP changed while the 2048 * cookie was in flight. Only recourse is to abort the 2049 * association. 2050 */ 2051 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2052 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2053 src, dst, sh, op_err, 2054 mflowtype, mflowid, 2055 vrf_id, port); 2056 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2057 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2058 return (NULL); 2059 } 2060 /* process the INIT-ACK info (my info) */ 2061 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2062 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2063 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2064 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2065 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2066 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2067 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2068 asoc->str_reset_seq_in = asoc->init_seq_number; 2069 2070 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2071 2072 /* process the INIT info (peer's info) */ 2073 retval = sctp_process_init(init_cp, stcb); 2074 if (retval < 0) { 2075 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2076 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2077 return (NULL); 2078 } 2079 /* load all addresses */ 2080 if (sctp_load_addresses_from_init(stcb, m, 2081 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2082 src, dst, init_src, port)) { 2083 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2084 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2085 return (NULL); 2086 } 2087 /* 2088 * verify any preceding AUTH chunk that was skipped 2089 */ 2090 /* pull the local authentication parameters from the cookie/init-ack */ 2091 sctp_auth_get_cookie_params(stcb, m, 2092 initack_offset + sizeof(struct sctp_init_ack_chunk), 2093 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2094 if (auth_skipped) { 2095 struct sctp_auth_chunk *auth; 2096 2097 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2098 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2099 } else { 2100 auth = NULL; 2101 } 2102 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2103 /* auth HMAC failed, dump the assoc and packet */ 2104 SCTPDBG(SCTP_DEBUG_AUTH1, 2105 "COOKIE-ECHO: AUTH failed\n"); 2106 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2107 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2108 return (NULL); 2109 } else { 2110 /* remaining chunks checked... good to go */ 2111 stcb->asoc.authenticated = 1; 2112 } 2113 } 2114 2115 /* 2116 * if we're doing ASCONFs, check to see if we have any new local 2117 * addresses that need to get added to the peer (eg. addresses 2118 * changed while cookie echo in flight). This needs to be done 2119 * after we go to the OPEN state to do the correct asconf 2120 * processing. else, make sure we have the correct addresses in our 2121 * lists 2122 */ 2123 2124 /* warning, we re-use sin, sin6, sa_store here! */ 2125 /* pull in local_address (our "from" address) */ 2126 switch (cookie->laddr_type) { 2127 #ifdef INET 2128 case SCTP_IPV4_ADDRESS: 2129 /* source addr is IPv4 */ 2130 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2131 store.sin.sin_family = AF_INET; 2132 store.sin.sin_len = sizeof(struct sockaddr_in); 2133 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2134 break; 2135 #endif 2136 #ifdef INET6 2137 case SCTP_IPV6_ADDRESS: 2138 /* source addr is IPv6 */ 2139 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2140 store.sin6.sin6_family = AF_INET6; 2141 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2142 store.sin6.sin6_scope_id = cookie->scope_id; 2143 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2144 break; 2145 #endif 2146 default: 2147 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2148 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2149 return (NULL); 2150 } 2151 2152 /* update current state */ 2153 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2154 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2155 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2156 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2157 stcb->sctp_ep, stcb, NULL); 2158 } 2159 sctp_stop_all_cookie_timers(stcb); 2160 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2161 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2162 2163 /* set up to notify upper layer */ 2164 *notification = SCTP_NOTIFY_ASSOC_UP; 2165 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2166 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2167 (!SCTP_IS_LISTENING(inp))) { 2168 /* 2169 * This is an endpoint that called connect() how it got a 2170 * cookie that is NEW is a bit of a mystery. It must be that 2171 * the INIT was sent, but before it got there.. a complete 2172 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2173 * should have went to the other code.. not here.. oh well.. 2174 * a bit of protection is worth having.. 2175 */ 2176 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2177 soisconnected(stcb->sctp_socket); 2178 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2179 (SCTP_IS_LISTENING(inp))) { 2180 /* 2181 * We don't want to do anything with this one. Since it is 2182 * the listening guy. The timer will get started for 2183 * accepted connections in the caller. 2184 */ 2185 ; 2186 } 2187 if (stcb->asoc.sctp_autoclose_ticks && 2188 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2189 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2190 } 2191 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2192 *netp = sctp_findnet(stcb, init_src); 2193 if (*netp != NULL) { 2194 struct timeval old; 2195 2196 /* 2197 * Since we did not send a HB, make sure we don't double 2198 * things. 2199 */ 2200 (*netp)->hb_responded = 1; 2201 /* Calculate the RTT. */ 2202 old.tv_sec = cookie->time_entered.tv_sec; 2203 old.tv_usec = cookie->time_entered.tv_usec; 2204 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2205 } 2206 /* respond with a COOKIE-ACK */ 2207 sctp_send_cookie_ack(stcb); 2208 2209 /* 2210 * check the address lists for any ASCONFs that need to be sent 2211 * AFTER the cookie-ack is sent 2212 */ 2213 sctp_check_address_list(stcb, m, 2214 initack_offset + sizeof(struct sctp_init_ack_chunk), 2215 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2216 &store.sa, cookie->local_scope, cookie->site_scope, 2217 cookie->ipv4_scope, cookie->loopback_scope); 2218 2219 return (stcb); 2220 } 2221 2222 /* 2223 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2224 * we NEED to make sure we are not already using the vtag. If so we 2225 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2226 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2227 SCTP_BASE_INFO(hashasocmark))]; 2228 LIST_FOREACH(stcb, head, sctp_asocs) { 2229 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2230 -- SEND ABORT - TRY AGAIN -- 2231 } 2232 } 2233 */ 2234 2235 /* 2236 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2237 * existing (non-NULL) TCB 2238 */ 2239 static struct mbuf * 2240 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2241 struct sockaddr *src, struct sockaddr *dst, 2242 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2243 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2244 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2245 struct sctp_tcb **locked_tcb, 2246 uint8_t mflowtype, uint32_t mflowid, 2247 uint32_t vrf_id, uint16_t port) 2248 { 2249 struct sctp_state_cookie *cookie; 2250 struct sctp_tcb *l_stcb = *stcb; 2251 struct sctp_inpcb *l_inp; 2252 struct sockaddr *to; 2253 struct sctp_pcb *ep; 2254 struct mbuf *m_sig; 2255 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2256 uint8_t *sig; 2257 uint8_t cookie_ok = 0; 2258 unsigned int sig_offset, cookie_offset; 2259 unsigned int cookie_len; 2260 struct timeval now; 2261 struct timeval time_expires; 2262 int notification = 0; 2263 struct sctp_nets *netl; 2264 int had_a_existing_tcb = 0; 2265 int send_int_conf = 0; 2266 #ifdef INET 2267 struct sockaddr_in sin; 2268 #endif 2269 #ifdef INET6 2270 struct sockaddr_in6 sin6; 2271 #endif 2272 2273 SCTPDBG(SCTP_DEBUG_INPUT2, 2274 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2275 2276 if (inp_p == NULL) { 2277 return (NULL); 2278 } 2279 cookie = &cp->cookie; 2280 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2281 cookie_len = ntohs(cp->ch.chunk_length); 2282 2283 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2284 sizeof(struct sctp_init_chunk) + 2285 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2286 /* cookie too small */ 2287 return (NULL); 2288 } 2289 if ((cookie->peerport != sh->src_port) || 2290 (cookie->myport != sh->dest_port) || 2291 (cookie->my_vtag != sh->v_tag)) { 2292 /* 2293 * invalid ports or bad tag. Note that we always leave the 2294 * v_tag in the header in network order and when we stored 2295 * it in the my_vtag slot we also left it in network order. 2296 * This maintains the match even though it may be in the 2297 * opposite byte order of the machine :-> 2298 */ 2299 return (NULL); 2300 } 2301 /* 2302 * split off the signature into its own mbuf (since it should not be 2303 * calculated in the sctp_hmac_m() call). 2304 */ 2305 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2306 m_sig = m_split(m, sig_offset, M_NOWAIT); 2307 if (m_sig == NULL) { 2308 /* out of memory or ?? */ 2309 return (NULL); 2310 } 2311 #ifdef SCTP_MBUF_LOGGING 2312 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2313 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2314 } 2315 #endif 2316 2317 /* 2318 * compute the signature/digest for the cookie 2319 */ 2320 ep = &(*inp_p)->sctp_ep; 2321 l_inp = *inp_p; 2322 if (l_stcb) { 2323 SCTP_TCB_UNLOCK(l_stcb); 2324 } 2325 SCTP_INP_RLOCK(l_inp); 2326 if (l_stcb) { 2327 SCTP_TCB_LOCK(l_stcb); 2328 } 2329 /* which cookie is it? */ 2330 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2331 (ep->current_secret_number != ep->last_secret_number)) { 2332 /* it's the old cookie */ 2333 (void)sctp_hmac_m(SCTP_HMAC, 2334 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2335 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2336 } else { 2337 /* it's the current cookie */ 2338 (void)sctp_hmac_m(SCTP_HMAC, 2339 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2340 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2341 } 2342 /* get the signature */ 2343 SCTP_INP_RUNLOCK(l_inp); 2344 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2345 if (sig == NULL) { 2346 /* couldn't find signature */ 2347 sctp_m_freem(m_sig); 2348 return (NULL); 2349 } 2350 /* compare the received digest with the computed digest */ 2351 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2352 /* try the old cookie? */ 2353 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2354 (ep->current_secret_number != ep->last_secret_number)) { 2355 /* compute digest with old */ 2356 (void)sctp_hmac_m(SCTP_HMAC, 2357 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2358 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2359 /* compare */ 2360 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2361 cookie_ok = 1; 2362 } 2363 } else { 2364 cookie_ok = 1; 2365 } 2366 2367 /* 2368 * Now before we continue we must reconstruct our mbuf so that 2369 * normal processing of any other chunks will work. 2370 */ 2371 { 2372 struct mbuf *m_at; 2373 2374 m_at = m; 2375 while (SCTP_BUF_NEXT(m_at) != NULL) { 2376 m_at = SCTP_BUF_NEXT(m_at); 2377 } 2378 SCTP_BUF_NEXT(m_at) = m_sig; 2379 } 2380 2381 if (cookie_ok == 0) { 2382 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2383 SCTPDBG(SCTP_DEBUG_INPUT2, 2384 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2385 (uint32_t)offset, cookie_offset, sig_offset); 2386 return (NULL); 2387 } 2388 2389 /* 2390 * check the cookie timestamps to be sure it's not stale 2391 */ 2392 (void)SCTP_GETTIME_TIMEVAL(&now); 2393 /* Expire time is in Ticks, so we convert to seconds */ 2394 time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2395 time_expires.tv_usec = cookie->time_entered.tv_usec; 2396 if (timevalcmp(&now, &time_expires, >)) { 2397 /* cookie is stale! */ 2398 struct mbuf *op_err; 2399 struct sctp_error_stale_cookie *cause; 2400 struct timeval diff; 2401 uint32_t staleness; 2402 2403 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2404 0, M_NOWAIT, 1, MT_DATA); 2405 if (op_err == NULL) { 2406 /* FOOBAR */ 2407 return (NULL); 2408 } 2409 /* Set the len */ 2410 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2411 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2412 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2413 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2414 (sizeof(uint32_t)))); 2415 diff = now; 2416 timevalsub(&diff, &time_expires); 2417 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2418 staleness = UINT32_MAX; 2419 } else { 2420 staleness = diff.tv_sec * 1000000; 2421 } 2422 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2423 staleness += diff.tv_usec; 2424 } else { 2425 staleness = UINT32_MAX; 2426 } 2427 cause->stale_time = htonl(staleness); 2428 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2429 mflowtype, mflowid, l_inp->fibnum, 2430 vrf_id, port); 2431 return (NULL); 2432 } 2433 /* 2434 * Now we must see with the lookup address if we have an existing 2435 * asoc. This will only happen if we were in the COOKIE-WAIT state 2436 * and a INIT collided with us and somewhere the peer sent the 2437 * cookie on another address besides the single address our assoc 2438 * had for him. In this case we will have one of the tie-tags set at 2439 * least AND the address field in the cookie can be used to look it 2440 * up. 2441 */ 2442 to = NULL; 2443 switch (cookie->addr_type) { 2444 #ifdef INET6 2445 case SCTP_IPV6_ADDRESS: 2446 memset(&sin6, 0, sizeof(sin6)); 2447 sin6.sin6_family = AF_INET6; 2448 sin6.sin6_len = sizeof(sin6); 2449 sin6.sin6_port = sh->src_port; 2450 sin6.sin6_scope_id = cookie->scope_id; 2451 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2452 sizeof(sin6.sin6_addr.s6_addr)); 2453 to = (struct sockaddr *)&sin6; 2454 break; 2455 #endif 2456 #ifdef INET 2457 case SCTP_IPV4_ADDRESS: 2458 memset(&sin, 0, sizeof(sin)); 2459 sin.sin_family = AF_INET; 2460 sin.sin_len = sizeof(sin); 2461 sin.sin_port = sh->src_port; 2462 sin.sin_addr.s_addr = cookie->address[0]; 2463 to = (struct sockaddr *)&sin; 2464 break; 2465 #endif 2466 default: 2467 /* This should not happen */ 2468 return (NULL); 2469 } 2470 if (*stcb == NULL) { 2471 /* Yep, lets check */ 2472 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2473 if (*stcb == NULL) { 2474 /* 2475 * We should have only got back the same inp. If we 2476 * got back a different ep we have a problem. The 2477 * original findep got back l_inp and now 2478 */ 2479 if (l_inp != *inp_p) { 2480 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2481 } 2482 } else { 2483 if (*locked_tcb == NULL) { 2484 /* 2485 * In this case we found the assoc only 2486 * after we locked the create lock. This 2487 * means we are in a colliding case and we 2488 * must make sure that we unlock the tcb if 2489 * its one of the cases where we throw away 2490 * the incoming packets. 2491 */ 2492 *locked_tcb = *stcb; 2493 2494 /* 2495 * We must also increment the inp ref count 2496 * since the ref_count flags was set when we 2497 * did not find the TCB, now we found it 2498 * which reduces the refcount.. we must 2499 * raise it back out to balance it all :-) 2500 */ 2501 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2502 if ((*stcb)->sctp_ep != l_inp) { 2503 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2504 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2505 } 2506 } 2507 } 2508 } 2509 2510 cookie_len -= SCTP_SIGNATURE_SIZE; 2511 if (*stcb == NULL) { 2512 /* this is the "normal" case... get a new TCB */ 2513 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2514 cookie, cookie_len, *inp_p, 2515 netp, to, ¬ification, 2516 auth_skipped, auth_offset, auth_len, 2517 mflowtype, mflowid, 2518 vrf_id, port); 2519 } else { 2520 /* this is abnormal... cookie-echo on existing TCB */ 2521 had_a_existing_tcb = 1; 2522 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2523 src, dst, sh, 2524 cookie, cookie_len, *inp_p, *stcb, netp, to, 2525 ¬ification, auth_skipped, auth_offset, auth_len, 2526 mflowtype, mflowid, 2527 vrf_id, port); 2528 } 2529 2530 if (*stcb == NULL) { 2531 /* still no TCB... must be bad cookie-echo */ 2532 return (NULL); 2533 } 2534 if (*netp != NULL) { 2535 (*netp)->flowtype = mflowtype; 2536 (*netp)->flowid = mflowid; 2537 } 2538 /* 2539 * Ok, we built an association so confirm the address we sent the 2540 * INIT-ACK to. 2541 */ 2542 netl = sctp_findnet(*stcb, to); 2543 /* 2544 * This code should in theory NOT run but 2545 */ 2546 if (netl == NULL) { 2547 /* TSNH! Huh, why do I need to add this address here? */ 2548 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2549 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2550 return (NULL); 2551 } 2552 netl = sctp_findnet(*stcb, to); 2553 } 2554 if (netl) { 2555 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2556 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2557 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2558 netl); 2559 send_int_conf = 1; 2560 } 2561 } 2562 sctp_start_net_timers(*stcb); 2563 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2564 if (!had_a_existing_tcb || 2565 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2566 /* 2567 * If we have a NEW cookie or the connect never 2568 * reached the connected state during collision we 2569 * must do the TCP accept thing. 2570 */ 2571 struct socket *so, *oso; 2572 struct sctp_inpcb *inp; 2573 2574 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2575 /* 2576 * For a restart we will keep the same 2577 * socket, no need to do anything. I THINK!! 2578 */ 2579 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2580 if (send_int_conf) { 2581 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2582 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2583 } 2584 return (m); 2585 } 2586 oso = (*inp_p)->sctp_socket; 2587 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2588 SCTP_TCB_UNLOCK((*stcb)); 2589 CURVNET_SET(oso->so_vnet); 2590 so = sonewconn(oso, 0 2591 ); 2592 CURVNET_RESTORE(); 2593 SCTP_TCB_LOCK((*stcb)); 2594 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2595 2596 if (so == NULL) { 2597 struct mbuf *op_err; 2598 2599 /* Too many sockets */ 2600 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2601 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2602 sctp_abort_association(*inp_p, NULL, m, iphlen, 2603 src, dst, sh, op_err, 2604 mflowtype, mflowid, 2605 vrf_id, port); 2606 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2607 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2608 return (NULL); 2609 } 2610 inp = (struct sctp_inpcb *)so->so_pcb; 2611 SCTP_INP_INCR_REF(inp); 2612 /* 2613 * We add the unbound flag here so that if we get an 2614 * soabort() before we get the move_pcb done, we 2615 * will properly cleanup. 2616 */ 2617 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2618 SCTP_PCB_FLAGS_CONNECTED | 2619 SCTP_PCB_FLAGS_IN_TCPPOOL | 2620 SCTP_PCB_FLAGS_UNBOUND | 2621 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2622 SCTP_PCB_FLAGS_DONT_WAKE); 2623 inp->sctp_features = (*inp_p)->sctp_features; 2624 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2625 inp->sctp_socket = so; 2626 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2627 inp->max_cwnd = (*inp_p)->max_cwnd; 2628 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2629 inp->ecn_supported = (*inp_p)->ecn_supported; 2630 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2631 inp->auth_supported = (*inp_p)->auth_supported; 2632 inp->asconf_supported = (*inp_p)->asconf_supported; 2633 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2634 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2635 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2636 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2637 inp->sctp_context = (*inp_p)->sctp_context; 2638 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2639 inp->fibnum = (*inp_p)->fibnum; 2640 inp->inp_starting_point_for_iterator = NULL; 2641 /* 2642 * copy in the authentication parameters from the 2643 * original endpoint 2644 */ 2645 if (inp->sctp_ep.local_hmacs) 2646 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2647 inp->sctp_ep.local_hmacs = 2648 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2649 if (inp->sctp_ep.local_auth_chunks) 2650 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2651 inp->sctp_ep.local_auth_chunks = 2652 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2653 2654 /* 2655 * Now we must move it from one hash table to 2656 * another and get the tcb in the right place. 2657 */ 2658 2659 /* 2660 * This is where the one-2-one socket is put into 2661 * the accept state waiting for the accept! 2662 */ 2663 if (*stcb) { 2664 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2665 } 2666 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2667 2668 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2669 SCTP_TCB_UNLOCK((*stcb)); 2670 2671 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2672 0); 2673 SCTP_TCB_LOCK((*stcb)); 2674 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2675 2676 /* 2677 * now we must check to see if we were aborted while 2678 * the move was going on and the lock/unlock 2679 * happened. 2680 */ 2681 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2682 /* 2683 * yep it was, we leave the assoc attached 2684 * to the socket since the sctp_inpcb_free() 2685 * call will send an abort for us. 2686 */ 2687 SCTP_INP_DECR_REF(inp); 2688 return (NULL); 2689 } 2690 SCTP_INP_DECR_REF(inp); 2691 /* Switch over to the new guy */ 2692 *inp_p = inp; 2693 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2694 if (send_int_conf) { 2695 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2696 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2697 } 2698 2699 /* 2700 * Pull it from the incomplete queue and wake the 2701 * guy 2702 */ 2703 soisconnected(so); 2704 return (m); 2705 } 2706 } 2707 if (notification) { 2708 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2709 } 2710 if (send_int_conf) { 2711 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2712 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2713 } 2714 return (m); 2715 } 2716 2717 static void 2718 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2719 struct sctp_tcb *stcb, struct sctp_nets *net) 2720 { 2721 /* cp must not be used, others call this without a c-ack :-) */ 2722 struct sctp_association *asoc; 2723 struct sctp_tmit_chunk *chk; 2724 2725 SCTPDBG(SCTP_DEBUG_INPUT2, 2726 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2727 if ((stcb == NULL) || (net == NULL)) { 2728 return; 2729 } 2730 2731 asoc = &stcb->asoc; 2732 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2733 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2734 asoc->overall_error_count, 2735 0, 2736 SCTP_FROM_SCTP_INPUT, 2737 __LINE__); 2738 } 2739 asoc->overall_error_count = 0; 2740 sctp_stop_all_cookie_timers(stcb); 2741 /* process according to association state */ 2742 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2743 /* state change only needed when I am in right state */ 2744 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2745 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2746 sctp_start_net_timers(stcb); 2747 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2748 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2749 stcb->sctp_ep, stcb, NULL); 2750 } 2751 /* update RTO */ 2752 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2753 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2754 if (asoc->overall_error_count == 0) { 2755 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2756 SCTP_RTT_FROM_NON_DATA); 2757 } 2758 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2759 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2760 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2761 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2762 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2763 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2764 soisconnected(stcb->sctp_socket); 2765 } 2766 } 2767 /* 2768 * since we did not send a HB make sure we don't double 2769 * things 2770 */ 2771 net->hb_responded = 1; 2772 2773 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2774 /* 2775 * We don't need to do the asconf thing, nor hb or 2776 * autoclose if the socket is closed. 2777 */ 2778 goto closed_socket; 2779 } 2780 2781 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2782 stcb, net); 2783 2784 if (stcb->asoc.sctp_autoclose_ticks && 2785 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2786 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2787 stcb->sctp_ep, stcb, NULL); 2788 } 2789 /* 2790 * send ASCONF if parameters are pending and ASCONFs are 2791 * allowed (eg. addresses changed when init/cookie echo were 2792 * in flight) 2793 */ 2794 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2795 (stcb->asoc.asconf_supported == 1) && 2796 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2797 #ifdef SCTP_TIMER_BASED_ASCONF 2798 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2799 stcb->sctp_ep, stcb, 2800 stcb->asoc.primary_destination); 2801 #else 2802 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2803 SCTP_ADDR_NOT_LOCKED); 2804 #endif 2805 } 2806 } 2807 closed_socket: 2808 /* Toss the cookie if I can */ 2809 sctp_toss_old_cookies(stcb, asoc); 2810 /* Restart the timer if we have pending data */ 2811 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2812 if (chk->whoTo != NULL) { 2813 break; 2814 } 2815 } 2816 if (chk != NULL) { 2817 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2818 } 2819 } 2820 2821 static void 2822 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2823 struct sctp_tcb *stcb) 2824 { 2825 struct sctp_nets *net; 2826 struct sctp_tmit_chunk *lchk; 2827 struct sctp_ecne_chunk bkup; 2828 uint8_t override_bit; 2829 uint32_t tsn, window_data_tsn; 2830 int len; 2831 unsigned int pkt_cnt; 2832 2833 len = ntohs(cp->ch.chunk_length); 2834 if ((len != sizeof(struct sctp_ecne_chunk)) && 2835 (len != sizeof(struct old_sctp_ecne_chunk))) { 2836 return; 2837 } 2838 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2839 /* Its the old format */ 2840 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2841 bkup.num_pkts_since_cwr = htonl(1); 2842 cp = &bkup; 2843 } 2844 SCTP_STAT_INCR(sctps_recvecne); 2845 tsn = ntohl(cp->tsn); 2846 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2847 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2848 if (lchk == NULL) { 2849 window_data_tsn = stcb->asoc.sending_seq - 1; 2850 } else { 2851 window_data_tsn = lchk->rec.data.tsn; 2852 } 2853 2854 /* Find where it was sent to if possible. */ 2855 net = NULL; 2856 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2857 if (lchk->rec.data.tsn == tsn) { 2858 net = lchk->whoTo; 2859 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2860 break; 2861 } 2862 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2863 break; 2864 } 2865 } 2866 if (net == NULL) { 2867 /* 2868 * What to do. A previous send of a CWR was possibly lost. 2869 * See how old it is, we may have it marked on the actual 2870 * net. 2871 */ 2872 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2873 if (tsn == net->last_cwr_tsn) { 2874 /* Found him, send it off */ 2875 break; 2876 } 2877 } 2878 if (net == NULL) { 2879 /* 2880 * If we reach here, we need to send a special CWR 2881 * that says hey, we did this a long time ago and 2882 * you lost the response. 2883 */ 2884 net = TAILQ_FIRST(&stcb->asoc.nets); 2885 if (net == NULL) { 2886 /* TSNH */ 2887 return; 2888 } 2889 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2890 } else { 2891 override_bit = 0; 2892 } 2893 } else { 2894 override_bit = 0; 2895 } 2896 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2897 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2898 /* 2899 * JRS - Use the congestion control given in the pluggable 2900 * CC module 2901 */ 2902 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2903 /* 2904 * We reduce once every RTT. So we will only lower cwnd at 2905 * the next sending seq i.e. the window_data_tsn 2906 */ 2907 net->cwr_window_tsn = window_data_tsn; 2908 net->ecn_ce_pkt_cnt += pkt_cnt; 2909 net->lost_cnt = pkt_cnt; 2910 net->last_cwr_tsn = tsn; 2911 } else { 2912 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2913 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2914 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2915 /* 2916 * Another loss in the same window update how many 2917 * marks/packets lost we have had. 2918 */ 2919 int cnt = 1; 2920 2921 if (pkt_cnt > net->lost_cnt) { 2922 /* Should be the case */ 2923 cnt = (pkt_cnt - net->lost_cnt); 2924 net->ecn_ce_pkt_cnt += cnt; 2925 } 2926 net->lost_cnt = pkt_cnt; 2927 net->last_cwr_tsn = tsn; 2928 /* 2929 * Most CC functions will ignore this call, since we 2930 * are in-window yet of the initial CE the peer saw. 2931 */ 2932 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2933 } 2934 } 2935 /* 2936 * We always send a CWR this way if our previous one was lost our 2937 * peer will get an update, or if it is not time again to reduce we 2938 * still get the cwr to the peer. Note we set the override when we 2939 * could not find the TSN on the chunk or the destination network. 2940 */ 2941 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2942 } 2943 2944 static void 2945 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2946 { 2947 /* 2948 * Here we get a CWR from the peer. We must look in the outqueue and 2949 * make sure that we have a covered ECNE in the control chunk part. 2950 * If so remove it. 2951 */ 2952 struct sctp_tmit_chunk *chk, *nchk; 2953 struct sctp_ecne_chunk *ecne; 2954 int override; 2955 uint32_t cwr_tsn; 2956 2957 cwr_tsn = ntohl(cp->tsn); 2958 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2959 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2960 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2961 continue; 2962 } 2963 if ((override == 0) && (chk->whoTo != net)) { 2964 /* Must be from the right src unless override is set */ 2965 continue; 2966 } 2967 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2968 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2969 /* this covers this ECNE, we can remove it */ 2970 stcb->asoc.ecn_echo_cnt_onq--; 2971 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2972 sctp_next); 2973 stcb->asoc.ctrl_queue_cnt--; 2974 sctp_m_freem(chk->data); 2975 chk->data = NULL; 2976 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 2977 if (override == 0) { 2978 break; 2979 } 2980 } 2981 } 2982 } 2983 2984 static void 2985 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 2986 struct sctp_tcb *stcb, struct sctp_nets *net) 2987 { 2988 2989 SCTPDBG(SCTP_DEBUG_INPUT2, 2990 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2991 if (stcb == NULL) 2992 return; 2993 2994 /* process according to association state */ 2995 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2996 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 2997 SCTPDBG(SCTP_DEBUG_INPUT2, 2998 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 2999 SCTP_TCB_UNLOCK(stcb); 3000 return; 3001 } 3002 /* notify upper layer protocol */ 3003 if (stcb->sctp_socket) { 3004 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3005 } 3006 #ifdef INVARIANTS 3007 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3008 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3009 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3010 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3011 } 3012 #endif 3013 /* stop the timer */ 3014 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3015 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3016 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3017 /* free the TCB */ 3018 SCTPDBG(SCTP_DEBUG_INPUT2, 3019 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3020 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3021 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3022 return; 3023 } 3024 3025 static int 3026 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3027 struct sctp_nets *net, uint8_t flg) 3028 { 3029 switch (desc->chunk_type) { 3030 case SCTP_DATA: 3031 case SCTP_IDATA: 3032 /* find the tsn to resend (possibly) */ 3033 { 3034 uint32_t tsn; 3035 struct sctp_tmit_chunk *tp1; 3036 3037 tsn = ntohl(desc->tsn_ifany); 3038 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3039 if (tp1->rec.data.tsn == tsn) { 3040 /* found it */ 3041 break; 3042 } 3043 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3044 /* not found */ 3045 tp1 = NULL; 3046 break; 3047 } 3048 } 3049 if (tp1 == NULL) { 3050 /* 3051 * Do it the other way , aka without paying 3052 * attention to queue seq order. 3053 */ 3054 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3055 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3056 if (tp1->rec.data.tsn == tsn) { 3057 /* found it */ 3058 break; 3059 } 3060 } 3061 } 3062 if (tp1 == NULL) { 3063 SCTP_STAT_INCR(sctps_pdrptsnnf); 3064 } 3065 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3066 if (((flg & SCTP_BADCRC) == 0) && 3067 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3068 return (0); 3069 } 3070 if ((stcb->asoc.peers_rwnd == 0) && 3071 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3072 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3073 return (0); 3074 } 3075 if (stcb->asoc.peers_rwnd == 0 && 3076 (flg & SCTP_FROM_MIDDLE_BOX)) { 3077 SCTP_STAT_INCR(sctps_pdrpdizrw); 3078 return (0); 3079 } 3080 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3081 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3082 /* Payload not matching. */ 3083 SCTP_STAT_INCR(sctps_pdrpbadd); 3084 return (-1); 3085 } 3086 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3087 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3088 /* Payload not matching. */ 3089 SCTP_STAT_INCR(sctps_pdrpbadd); 3090 return (-1); 3091 } 3092 if (tp1->do_rtt) { 3093 /* 3094 * this guy had a RTO calculation 3095 * pending on it, cancel it 3096 */ 3097 if (tp1->whoTo->rto_needed == 0) { 3098 tp1->whoTo->rto_needed = 1; 3099 } 3100 tp1->do_rtt = 0; 3101 } 3102 SCTP_STAT_INCR(sctps_pdrpmark); 3103 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3104 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3105 /* 3106 * mark it as if we were doing a FR, since 3107 * we will be getting gap ack reports behind 3108 * the info from the router. 3109 */ 3110 tp1->rec.data.doing_fast_retransmit = 1; 3111 /* 3112 * mark the tsn with what sequences can 3113 * cause a new FR. 3114 */ 3115 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3116 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3117 } else { 3118 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3119 } 3120 3121 /* restart the timer */ 3122 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3123 stcb, tp1->whoTo, 3124 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3125 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3126 stcb, tp1->whoTo); 3127 3128 /* fix counts and things */ 3129 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3130 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3131 tp1->whoTo->flight_size, 3132 tp1->book_size, 3133 (uint32_t)(uintptr_t)stcb, 3134 tp1->rec.data.tsn); 3135 } 3136 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3137 sctp_flight_size_decrease(tp1); 3138 sctp_total_flight_decrease(stcb, tp1); 3139 } 3140 tp1->sent = SCTP_DATAGRAM_RESEND; 3141 } { 3142 /* audit code */ 3143 unsigned int audit; 3144 3145 audit = 0; 3146 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3147 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3148 audit++; 3149 } 3150 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3151 sctp_next) { 3152 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3153 audit++; 3154 } 3155 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3156 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3157 audit, stcb->asoc.sent_queue_retran_cnt); 3158 #ifndef SCTP_AUDITING_ENABLED 3159 stcb->asoc.sent_queue_retran_cnt = audit; 3160 #endif 3161 } 3162 } 3163 } 3164 break; 3165 case SCTP_ASCONF: 3166 { 3167 struct sctp_tmit_chunk *asconf; 3168 3169 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3170 sctp_next) { 3171 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3172 break; 3173 } 3174 } 3175 if (asconf) { 3176 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3177 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3178 asconf->sent = SCTP_DATAGRAM_RESEND; 3179 asconf->snd_count--; 3180 } 3181 } 3182 break; 3183 case SCTP_INITIATION: 3184 /* resend the INIT */ 3185 stcb->asoc.dropped_special_cnt++; 3186 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3187 /* 3188 * If we can get it in, in a few attempts we do 3189 * this, otherwise we let the timer fire. 3190 */ 3191 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3192 stcb, net, 3193 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3194 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3195 } 3196 break; 3197 case SCTP_SELECTIVE_ACK: 3198 case SCTP_NR_SELECTIVE_ACK: 3199 /* resend the sack */ 3200 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3201 break; 3202 case SCTP_HEARTBEAT_REQUEST: 3203 /* resend a demand HB */ 3204 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3205 /* 3206 * Only retransmit if we KNOW we wont destroy the 3207 * tcb 3208 */ 3209 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3210 } 3211 break; 3212 case SCTP_SHUTDOWN: 3213 sctp_send_shutdown(stcb, net); 3214 break; 3215 case SCTP_SHUTDOWN_ACK: 3216 sctp_send_shutdown_ack(stcb, net); 3217 break; 3218 case SCTP_COOKIE_ECHO: 3219 { 3220 struct sctp_tmit_chunk *cookie; 3221 3222 cookie = NULL; 3223 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3224 sctp_next) { 3225 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3226 break; 3227 } 3228 } 3229 if (cookie) { 3230 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3231 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3232 cookie->sent = SCTP_DATAGRAM_RESEND; 3233 sctp_stop_all_cookie_timers(stcb); 3234 } 3235 } 3236 break; 3237 case SCTP_COOKIE_ACK: 3238 sctp_send_cookie_ack(stcb); 3239 break; 3240 case SCTP_ASCONF_ACK: 3241 /* resend last asconf ack */ 3242 sctp_send_asconf_ack(stcb); 3243 break; 3244 case SCTP_IFORWARD_CUM_TSN: 3245 case SCTP_FORWARD_CUM_TSN: 3246 send_forward_tsn(stcb, &stcb->asoc); 3247 break; 3248 /* can't do anything with these */ 3249 case SCTP_PACKET_DROPPED: 3250 case SCTP_INITIATION_ACK: /* this should not happen */ 3251 case SCTP_HEARTBEAT_ACK: 3252 case SCTP_ABORT_ASSOCIATION: 3253 case SCTP_OPERATION_ERROR: 3254 case SCTP_SHUTDOWN_COMPLETE: 3255 case SCTP_ECN_ECHO: 3256 case SCTP_ECN_CWR: 3257 default: 3258 break; 3259 } 3260 return (0); 3261 } 3262 3263 void 3264 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3265 { 3266 uint32_t i; 3267 uint16_t temp; 3268 3269 /* 3270 * We set things to 0xffffffff since this is the last delivered 3271 * sequence and we will be sending in 0 after the reset. 3272 */ 3273 3274 if (number_entries) { 3275 for (i = 0; i < number_entries; i++) { 3276 temp = ntohs(list[i]); 3277 if (temp >= stcb->asoc.streamincnt) { 3278 continue; 3279 } 3280 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3281 } 3282 } else { 3283 list = NULL; 3284 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3285 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3286 } 3287 } 3288 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3289 } 3290 3291 static void 3292 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3293 { 3294 uint32_t i; 3295 uint16_t temp; 3296 3297 if (number_entries > 0) { 3298 for (i = 0; i < number_entries; i++) { 3299 temp = ntohs(list[i]); 3300 if (temp >= stcb->asoc.streamoutcnt) { 3301 /* no such stream */ 3302 continue; 3303 } 3304 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3305 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3306 } 3307 } else { 3308 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3309 stcb->asoc.strmout[i].next_mid_ordered = 0; 3310 stcb->asoc.strmout[i].next_mid_unordered = 0; 3311 } 3312 } 3313 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3314 } 3315 3316 static void 3317 sctp_reset_clear_pending(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].state = SCTP_STREAM_OPEN; 3330 } 3331 } else { 3332 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3333 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3334 } 3335 } 3336 } 3337 3338 struct sctp_stream_reset_request * 3339 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3340 { 3341 struct sctp_association *asoc; 3342 struct sctp_chunkhdr *ch; 3343 struct sctp_stream_reset_request *r; 3344 struct sctp_tmit_chunk *chk; 3345 int len, clen; 3346 3347 asoc = &stcb->asoc; 3348 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3349 asoc->stream_reset_outstanding = 0; 3350 return (NULL); 3351 } 3352 if (stcb->asoc.str_reset == NULL) { 3353 asoc->stream_reset_outstanding = 0; 3354 return (NULL); 3355 } 3356 chk = stcb->asoc.str_reset; 3357 if (chk->data == NULL) { 3358 return (NULL); 3359 } 3360 if (bchk) { 3361 /* he wants a copy of the chk pointer */ 3362 *bchk = chk; 3363 } 3364 clen = chk->send_size; 3365 ch = mtod(chk->data, struct sctp_chunkhdr *); 3366 r = (struct sctp_stream_reset_request *)(ch + 1); 3367 if (ntohl(r->request_seq) == seq) { 3368 /* found it */ 3369 return (r); 3370 } 3371 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3372 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3373 /* move to the next one, there can only be a max of two */ 3374 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3375 if (ntohl(r->request_seq) == seq) { 3376 return (r); 3377 } 3378 } 3379 /* that seq is not here */ 3380 return (NULL); 3381 } 3382 3383 static void 3384 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3385 { 3386 struct sctp_association *asoc; 3387 struct sctp_tmit_chunk *chk; 3388 3389 asoc = &stcb->asoc; 3390 chk = asoc->str_reset; 3391 if (chk == NULL) { 3392 return; 3393 } 3394 asoc->str_reset = NULL; 3395 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3396 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3397 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3398 asoc->ctrl_queue_cnt--; 3399 if (chk->data) { 3400 sctp_m_freem(chk->data); 3401 chk->data = NULL; 3402 } 3403 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3404 } 3405 3406 static int 3407 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3408 uint32_t seq, uint32_t action, 3409 struct sctp_stream_reset_response *respin) 3410 { 3411 uint16_t type; 3412 int lparam_len; 3413 struct sctp_association *asoc = &stcb->asoc; 3414 struct sctp_tmit_chunk *chk; 3415 struct sctp_stream_reset_request *req_param; 3416 struct sctp_stream_reset_out_request *req_out_param; 3417 struct sctp_stream_reset_in_request *req_in_param; 3418 uint32_t number_entries; 3419 3420 if (asoc->stream_reset_outstanding == 0) { 3421 /* duplicate */ 3422 return (0); 3423 } 3424 if (seq == stcb->asoc.str_reset_seq_out) { 3425 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3426 if (req_param != NULL) { 3427 stcb->asoc.str_reset_seq_out++; 3428 type = ntohs(req_param->ph.param_type); 3429 lparam_len = ntohs(req_param->ph.param_length); 3430 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3431 int no_clear = 0; 3432 3433 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3434 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3435 asoc->stream_reset_out_is_outstanding = 0; 3436 if (asoc->stream_reset_outstanding) 3437 asoc->stream_reset_outstanding--; 3438 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3439 /* do it */ 3440 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3441 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3442 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3443 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3444 /* 3445 * Set it up so we don't stop 3446 * retransmitting 3447 */ 3448 asoc->stream_reset_outstanding++; 3449 stcb->asoc.str_reset_seq_out--; 3450 asoc->stream_reset_out_is_outstanding = 1; 3451 no_clear = 1; 3452 } else { 3453 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3454 } 3455 if (no_clear == 0) { 3456 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3457 } 3458 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3459 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3460 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3461 if (asoc->stream_reset_outstanding) 3462 asoc->stream_reset_outstanding--; 3463 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3464 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3465 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3466 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3467 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3468 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3469 } 3470 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3471 /* Ok we now may have more streams */ 3472 int num_stream; 3473 3474 num_stream = stcb->asoc.strm_pending_add_size; 3475 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3476 /* TSNH */ 3477 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3478 } 3479 stcb->asoc.strm_pending_add_size = 0; 3480 if (asoc->stream_reset_outstanding) 3481 asoc->stream_reset_outstanding--; 3482 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3483 /* Put the new streams into effect */ 3484 int i; 3485 3486 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3487 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3488 } 3489 asoc->streamoutcnt += num_stream; 3490 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3491 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3492 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3493 SCTP_STREAM_CHANGE_DENIED); 3494 } else { 3495 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3496 SCTP_STREAM_CHANGE_FAILED); 3497 } 3498 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3499 if (asoc->stream_reset_outstanding) 3500 asoc->stream_reset_outstanding--; 3501 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3502 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3503 SCTP_STREAM_CHANGE_DENIED); 3504 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3505 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3506 SCTP_STREAM_CHANGE_FAILED); 3507 } 3508 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3509 /** 3510 * a) Adopt the new in tsn. 3511 * b) reset the map 3512 * c) Adopt the new out-tsn 3513 */ 3514 struct sctp_stream_reset_response_tsn *resp; 3515 struct sctp_forward_tsn_chunk fwdtsn; 3516 int abort_flag = 0; 3517 3518 if (respin == NULL) { 3519 /* huh ? */ 3520 return (0); 3521 } 3522 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3523 return (0); 3524 } 3525 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3526 resp = (struct sctp_stream_reset_response_tsn *)respin; 3527 asoc->stream_reset_outstanding--; 3528 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3529 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3530 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3531 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3532 if (abort_flag) { 3533 return (1); 3534 } 3535 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3536 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3537 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3538 } 3539 3540 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3541 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3542 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3543 3544 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3545 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3546 3547 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3548 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3549 3550 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3551 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3552 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3553 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3554 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3555 SCTP_ASSOC_RESET_DENIED); 3556 } else { 3557 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3558 SCTP_ASSOC_RESET_FAILED); 3559 } 3560 } 3561 /* get rid of the request and get the request flags */ 3562 if (asoc->stream_reset_outstanding == 0) { 3563 sctp_clean_up_stream_reset(stcb); 3564 } 3565 } 3566 } 3567 if (asoc->stream_reset_outstanding == 0) { 3568 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3569 } 3570 return (0); 3571 } 3572 3573 static void 3574 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3575 struct sctp_tmit_chunk *chk, 3576 struct sctp_stream_reset_in_request *req, int trunc) 3577 { 3578 uint32_t seq; 3579 int len, i; 3580 int number_entries; 3581 uint16_t temp; 3582 3583 /* 3584 * peer wants me to send a str-reset to him for my outgoing seq's if 3585 * seq_in is right. 3586 */ 3587 struct sctp_association *asoc = &stcb->asoc; 3588 3589 seq = ntohl(req->request_seq); 3590 if (asoc->str_reset_seq_in == seq) { 3591 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3592 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3593 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3594 } else if (trunc) { 3595 /* Can't do it, since they exceeded our buffer size */ 3596 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3597 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3598 len = ntohs(req->ph.param_length); 3599 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3600 if (number_entries) { 3601 for (i = 0; i < number_entries; i++) { 3602 temp = ntohs(req->list_of_streams[i]); 3603 if (temp >= stcb->asoc.streamoutcnt) { 3604 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3605 goto bad_boy; 3606 } 3607 req->list_of_streams[i] = temp; 3608 } 3609 for (i = 0; i < number_entries; i++) { 3610 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3611 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3612 } 3613 } 3614 } else { 3615 /* Its all */ 3616 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3617 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3618 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3619 } 3620 } 3621 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3622 } else { 3623 /* Can't do it, since we have sent one out */ 3624 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3625 } 3626 bad_boy: 3627 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3628 asoc->str_reset_seq_in++; 3629 } else if (asoc->str_reset_seq_in - 1 == seq) { 3630 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3631 } else if (asoc->str_reset_seq_in - 2 == seq) { 3632 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3633 } else { 3634 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3635 } 3636 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3637 } 3638 3639 static int 3640 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3641 struct sctp_tmit_chunk *chk, 3642 struct sctp_stream_reset_tsn_request *req) 3643 { 3644 /* reset all in and out and update the tsn */ 3645 /* 3646 * A) reset my str-seq's on in and out. B) Select a receive next, 3647 * and set cum-ack to it. Also process this selected number as a 3648 * fwd-tsn as well. C) set in the response my next sending seq. 3649 */ 3650 struct sctp_forward_tsn_chunk fwdtsn; 3651 struct sctp_association *asoc = &stcb->asoc; 3652 int abort_flag = 0; 3653 uint32_t seq; 3654 3655 seq = ntohl(req->request_seq); 3656 if (asoc->str_reset_seq_in == seq) { 3657 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3658 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3659 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3660 } else { 3661 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3662 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3663 fwdtsn.ch.chunk_flags = 0; 3664 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3665 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3666 if (abort_flag) { 3667 return (1); 3668 } 3669 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3670 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3671 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3672 } 3673 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3674 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3675 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3676 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3677 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3678 atomic_add_int(&asoc->sending_seq, 1); 3679 /* save off historical data for retrans */ 3680 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3681 asoc->last_sending_seq[0] = asoc->sending_seq; 3682 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3683 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3684 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3685 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3686 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3687 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3688 } 3689 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3690 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3691 asoc->str_reset_seq_in++; 3692 } else if (asoc->str_reset_seq_in - 1 == seq) { 3693 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3694 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3695 } else if (asoc->str_reset_seq_in - 2 == seq) { 3696 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3697 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3698 } else { 3699 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3700 } 3701 return (0); 3702 } 3703 3704 static void 3705 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3706 struct sctp_tmit_chunk *chk, 3707 struct sctp_stream_reset_out_request *req, int trunc) 3708 { 3709 uint32_t seq, tsn; 3710 int number_entries, len; 3711 struct sctp_association *asoc = &stcb->asoc; 3712 3713 seq = ntohl(req->request_seq); 3714 3715 /* now if its not a duplicate we process it */ 3716 if (asoc->str_reset_seq_in == seq) { 3717 len = ntohs(req->ph.param_length); 3718 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3719 /* 3720 * the sender is resetting, handle the list issue.. we must 3721 * a) verify if we can do the reset, if so no problem b) If 3722 * we can't do the reset we must copy the request. c) queue 3723 * it, and setup the data in processor to trigger it off 3724 * when needed and dequeue all the queued data. 3725 */ 3726 tsn = ntohl(req->send_reset_at_tsn); 3727 3728 /* move the reset action back one */ 3729 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3730 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3731 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3732 } else if (trunc) { 3733 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3734 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3735 /* we can do it now */ 3736 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3737 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3738 } else { 3739 /* 3740 * we must queue it up and thus wait for the TSN's 3741 * to arrive that are at or before tsn 3742 */ 3743 struct sctp_stream_reset_list *liste; 3744 int siz; 3745 3746 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3747 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3748 siz, SCTP_M_STRESET); 3749 if (liste == NULL) { 3750 /* gak out of memory */ 3751 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3752 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3753 return; 3754 } 3755 liste->seq = seq; 3756 liste->tsn = tsn; 3757 liste->number_entries = number_entries; 3758 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3759 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3760 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3761 } 3762 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3763 asoc->str_reset_seq_in++; 3764 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3765 /* 3766 * one seq back, just echo back last action since my 3767 * response was lost. 3768 */ 3769 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3770 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3771 /* 3772 * two seq back, just echo back last action since my 3773 * response was lost. 3774 */ 3775 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3776 } else { 3777 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3778 } 3779 } 3780 3781 static void 3782 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3783 struct sctp_stream_reset_add_strm *str_add) 3784 { 3785 /* 3786 * Peer is requesting to add more streams. If its within our 3787 * max-streams we will allow it. 3788 */ 3789 uint32_t num_stream, i; 3790 uint32_t seq; 3791 struct sctp_association *asoc = &stcb->asoc; 3792 struct sctp_queued_to_read *ctl, *nctl; 3793 3794 /* Get the number. */ 3795 seq = ntohl(str_add->request_seq); 3796 num_stream = ntohs(str_add->number_of_streams); 3797 /* Now what would be the new total? */ 3798 if (asoc->str_reset_seq_in == seq) { 3799 num_stream += stcb->asoc.streamincnt; 3800 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3801 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3802 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3803 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3804 (num_stream > 0xffff)) { 3805 /* We must reject it they ask for to many */ 3806 denied: 3807 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3808 } else { 3809 /* Ok, we can do that :-) */ 3810 struct sctp_stream_in *oldstrm; 3811 3812 /* save off the old */ 3813 oldstrm = stcb->asoc.strmin; 3814 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3815 (num_stream * sizeof(struct sctp_stream_in)), 3816 SCTP_M_STRMI); 3817 if (stcb->asoc.strmin == NULL) { 3818 stcb->asoc.strmin = oldstrm; 3819 goto denied; 3820 } 3821 /* copy off the old data */ 3822 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3823 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3824 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3825 stcb->asoc.strmin[i].sid = i; 3826 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3827 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3828 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3829 /* now anything on those queues? */ 3830 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3831 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3832 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3833 } 3834 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3835 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3836 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3837 } 3838 } 3839 /* Init the new streams */ 3840 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3841 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3842 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3843 stcb->asoc.strmin[i].sid = i; 3844 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3845 stcb->asoc.strmin[i].pd_api_started = 0; 3846 stcb->asoc.strmin[i].delivery_started = 0; 3847 } 3848 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3849 /* update the size */ 3850 stcb->asoc.streamincnt = num_stream; 3851 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3852 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3853 } 3854 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3855 asoc->str_reset_seq_in++; 3856 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3857 /* 3858 * one seq back, just echo back last action since my 3859 * response was lost. 3860 */ 3861 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3862 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3863 /* 3864 * two seq back, just echo back last action since my 3865 * response was lost. 3866 */ 3867 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3868 } else { 3869 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3870 } 3871 } 3872 3873 static void 3874 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3875 struct sctp_stream_reset_add_strm *str_add) 3876 { 3877 /* 3878 * Peer is requesting to add more streams. If its within our 3879 * max-streams we will allow it. 3880 */ 3881 uint16_t num_stream; 3882 uint32_t seq; 3883 struct sctp_association *asoc = &stcb->asoc; 3884 3885 /* Get the number. */ 3886 seq = ntohl(str_add->request_seq); 3887 num_stream = ntohs(str_add->number_of_streams); 3888 /* Now what would be the new total? */ 3889 if (asoc->str_reset_seq_in == seq) { 3890 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3891 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3892 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3893 } else if (stcb->asoc.stream_reset_outstanding) { 3894 /* We must reject it we have something pending */ 3895 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3896 } else { 3897 /* Ok, we can do that :-) */ 3898 int mychk; 3899 3900 mychk = stcb->asoc.streamoutcnt; 3901 mychk += num_stream; 3902 if (mychk < 0x10000) { 3903 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3904 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3905 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3906 } 3907 } else { 3908 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3909 } 3910 } 3911 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3912 asoc->str_reset_seq_in++; 3913 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3914 /* 3915 * one seq back, just echo back last action since my 3916 * response was lost. 3917 */ 3918 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3919 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3920 /* 3921 * two seq back, just echo back last action since my 3922 * response was lost. 3923 */ 3924 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3925 } else { 3926 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3927 } 3928 } 3929 3930 #ifdef __GNUC__ 3931 __attribute__((noinline)) 3932 #endif 3933 static int 3934 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3935 struct sctp_chunkhdr *ch_req) 3936 { 3937 uint16_t remaining_length, param_len, ptype; 3938 struct sctp_paramhdr pstore; 3939 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3940 uint32_t seq = 0; 3941 int num_req = 0; 3942 int trunc = 0; 3943 struct sctp_tmit_chunk *chk; 3944 struct sctp_chunkhdr *ch; 3945 struct sctp_paramhdr *ph; 3946 int ret_code = 0; 3947 int num_param = 0; 3948 3949 /* now it may be a reset or a reset-response */ 3950 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3951 3952 /* setup for adding the response */ 3953 sctp_alloc_a_chunk(stcb, chk); 3954 if (chk == NULL) { 3955 return (ret_code); 3956 } 3957 chk->copy_by_ref = 0; 3958 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3959 chk->rec.chunk_id.can_take_data = 0; 3960 chk->flags = 0; 3961 chk->asoc = &stcb->asoc; 3962 chk->no_fr_allowed = 0; 3963 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3964 chk->book_size_scale = 0; 3965 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3966 if (chk->data == NULL) { 3967 strres_nochunk: 3968 if (chk->data) { 3969 sctp_m_freem(chk->data); 3970 chk->data = NULL; 3971 } 3972 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3973 return (ret_code); 3974 } 3975 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3976 3977 /* setup chunk parameters */ 3978 chk->sent = SCTP_DATAGRAM_UNSENT; 3979 chk->snd_count = 0; 3980 chk->whoTo = NULL; 3981 3982 ch = mtod(chk->data, struct sctp_chunkhdr *); 3983 ch->chunk_type = SCTP_STREAM_RESET; 3984 ch->chunk_flags = 0; 3985 ch->chunk_length = htons(chk->send_size); 3986 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3987 offset += sizeof(struct sctp_chunkhdr); 3988 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 3989 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 3990 if (ph == NULL) { 3991 /* TSNH */ 3992 break; 3993 } 3994 param_len = ntohs(ph->param_length); 3995 if ((param_len > remaining_length) || 3996 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 3997 /* bad parameter length */ 3998 break; 3999 } 4000 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4001 (uint8_t *)&cstore); 4002 if (ph == NULL) { 4003 /* TSNH */ 4004 break; 4005 } 4006 ptype = ntohs(ph->param_type); 4007 num_param++; 4008 if (param_len > sizeof(cstore)) { 4009 trunc = 1; 4010 } else { 4011 trunc = 0; 4012 } 4013 if (num_param > SCTP_MAX_RESET_PARAMS) { 4014 /* hit the max of parameters already sorry.. */ 4015 break; 4016 } 4017 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4018 struct sctp_stream_reset_out_request *req_out; 4019 4020 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4021 break; 4022 } 4023 req_out = (struct sctp_stream_reset_out_request *)ph; 4024 num_req++; 4025 if (stcb->asoc.stream_reset_outstanding) { 4026 seq = ntohl(req_out->response_seq); 4027 if (seq == stcb->asoc.str_reset_seq_out) { 4028 /* implicit ack */ 4029 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4030 } 4031 } 4032 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4033 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4034 struct sctp_stream_reset_add_strm *str_add; 4035 4036 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4037 break; 4038 } 4039 str_add = (struct sctp_stream_reset_add_strm *)ph; 4040 num_req++; 4041 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4042 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4043 struct sctp_stream_reset_add_strm *str_add; 4044 4045 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4046 break; 4047 } 4048 str_add = (struct sctp_stream_reset_add_strm *)ph; 4049 num_req++; 4050 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4051 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4052 struct sctp_stream_reset_in_request *req_in; 4053 4054 num_req++; 4055 req_in = (struct sctp_stream_reset_in_request *)ph; 4056 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4057 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4058 struct sctp_stream_reset_tsn_request *req_tsn; 4059 4060 num_req++; 4061 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4062 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4063 ret_code = 1; 4064 goto strres_nochunk; 4065 } 4066 /* no more */ 4067 break; 4068 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4069 struct sctp_stream_reset_response *resp; 4070 uint32_t result; 4071 4072 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4073 break; 4074 } 4075 resp = (struct sctp_stream_reset_response *)ph; 4076 seq = ntohl(resp->response_seq); 4077 result = ntohl(resp->result); 4078 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4079 ret_code = 1; 4080 goto strres_nochunk; 4081 } 4082 } else { 4083 break; 4084 } 4085 offset += SCTP_SIZE32(param_len); 4086 if (remaining_length >= SCTP_SIZE32(param_len)) { 4087 remaining_length -= SCTP_SIZE32(param_len); 4088 } else { 4089 remaining_length = 0; 4090 } 4091 } 4092 if (num_req == 0) { 4093 /* we have no response free the stuff */ 4094 goto strres_nochunk; 4095 } 4096 /* ok we have a chunk to link in */ 4097 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4098 chk, 4099 sctp_next); 4100 stcb->asoc.ctrl_queue_cnt++; 4101 return (ret_code); 4102 } 4103 4104 /* 4105 * Handle a router or endpoints report of a packet loss, there are two ways 4106 * to handle this, either we get the whole packet and must disect it 4107 * ourselves (possibly with truncation and or corruption) or it is a summary 4108 * from a middle box that did the disectting for us. 4109 */ 4110 static void 4111 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4112 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4113 { 4114 struct sctp_chunk_desc desc; 4115 struct sctp_chunkhdr *chk_hdr; 4116 struct sctp_data_chunk *data_chunk; 4117 struct sctp_idata_chunk *idata_chunk; 4118 uint32_t bottle_bw, on_queue; 4119 uint32_t offset, chk_len; 4120 uint16_t trunc_len; 4121 uint16_t pktdrp_len; 4122 uint8_t pktdrp_flags; 4123 4124 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4125 ("PKTDROP chunk too small")); 4126 pktdrp_flags = cp->ch.chunk_flags; 4127 pktdrp_len = ntohs(cp->ch.chunk_length); 4128 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4129 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4130 trunc_len = ntohs(cp->trunc_len); 4131 if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4132 /* The peer plays games with us. */ 4133 return; 4134 } 4135 } else { 4136 trunc_len = 0; 4137 } 4138 limit -= sizeof(struct sctp_pktdrop_chunk); 4139 offset = 0; 4140 if (offset == limit) { 4141 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4142 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4143 } 4144 } else if (offset + sizeof(struct sctphdr) > limit) { 4145 /* Only a partial SCTP common header. */ 4146 SCTP_STAT_INCR(sctps_pdrpcrupt); 4147 offset = limit; 4148 } else { 4149 /* XXX: Check embedded SCTP common header. */ 4150 offset += sizeof(struct sctphdr); 4151 } 4152 /* Now parse through the chunks themselves. */ 4153 while (offset < limit) { 4154 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4155 SCTP_STAT_INCR(sctps_pdrpcrupt); 4156 break; 4157 } 4158 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4159 desc.chunk_type = chk_hdr->chunk_type; 4160 /* get amount we need to move */ 4161 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4162 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4163 /* Someone is lying... */ 4164 break; 4165 } 4166 if (desc.chunk_type == SCTP_DATA) { 4167 if (stcb->asoc.idata_supported) { 4168 /* Some is playing games with us. */ 4169 break; 4170 } 4171 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4172 /* Some is playing games with us. */ 4173 break; 4174 } 4175 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4176 /* 4177 * Not enough data bytes available in the 4178 * chunk. 4179 */ 4180 SCTP_STAT_INCR(sctps_pdrpnedat); 4181 goto next_chunk; 4182 } 4183 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4184 /* Not enough data in buffer. */ 4185 break; 4186 } 4187 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4188 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4189 desc.tsn_ifany = data_chunk->dp.tsn; 4190 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4191 SCTP_STAT_INCR(sctps_pdrpmbda); 4192 } 4193 } else if (desc.chunk_type == SCTP_IDATA) { 4194 if (!stcb->asoc.idata_supported) { 4195 /* Some is playing games with us. */ 4196 break; 4197 } 4198 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4199 /* Some is playing games with us. */ 4200 break; 4201 } 4202 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4203 /* 4204 * Not enough data bytes available in the 4205 * chunk. 4206 */ 4207 SCTP_STAT_INCR(sctps_pdrpnedat); 4208 goto next_chunk; 4209 } 4210 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4211 /* Not enough data in buffer. */ 4212 break; 4213 } 4214 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4215 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4216 desc.tsn_ifany = idata_chunk->dp.tsn; 4217 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4218 SCTP_STAT_INCR(sctps_pdrpmbda); 4219 } 4220 } else { 4221 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4222 SCTP_STAT_INCR(sctps_pdrpmbct); 4223 } 4224 } 4225 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4226 SCTP_STAT_INCR(sctps_pdrppdbrk); 4227 break; 4228 } 4229 next_chunk: 4230 offset += SCTP_SIZE32(chk_len); 4231 } 4232 /* Now update any rwnd --- possibly */ 4233 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4234 /* From a peer, we get a rwnd report */ 4235 uint32_t a_rwnd; 4236 4237 SCTP_STAT_INCR(sctps_pdrpfehos); 4238 4239 bottle_bw = ntohl(cp->bottle_bw); 4240 on_queue = ntohl(cp->current_onq); 4241 if (bottle_bw && on_queue) { 4242 /* a rwnd report is in here */ 4243 if (bottle_bw > on_queue) 4244 a_rwnd = bottle_bw - on_queue; 4245 else 4246 a_rwnd = 0; 4247 4248 if (a_rwnd == 0) 4249 stcb->asoc.peers_rwnd = 0; 4250 else { 4251 if (a_rwnd > stcb->asoc.total_flight) { 4252 stcb->asoc.peers_rwnd = 4253 a_rwnd - stcb->asoc.total_flight; 4254 } else { 4255 stcb->asoc.peers_rwnd = 0; 4256 } 4257 if (stcb->asoc.peers_rwnd < 4258 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4259 /* SWS sender side engages */ 4260 stcb->asoc.peers_rwnd = 0; 4261 } 4262 } 4263 } 4264 } else { 4265 SCTP_STAT_INCR(sctps_pdrpfmbox); 4266 } 4267 4268 /* now middle boxes in sat networks get a cwnd bump */ 4269 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4270 (stcb->asoc.sat_t3_loss_recovery == 0) && 4271 (stcb->asoc.sat_network)) { 4272 /* 4273 * This is debatable but for sat networks it makes sense 4274 * Note if a T3 timer has went off, we will prohibit any 4275 * changes to cwnd until we exit the t3 loss recovery. 4276 */ 4277 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4278 net, cp, &bottle_bw, &on_queue); 4279 } 4280 } 4281 4282 /* 4283 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4284 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4285 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4286 * length of the complete packet outputs: - length: modified to remaining 4287 * length after control processing - netp: modified to new sctp_nets after 4288 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4289 * bad packet,...) otherwise return the tcb for this packet 4290 */ 4291 #ifdef __GNUC__ 4292 __attribute__((noinline)) 4293 #endif 4294 static struct sctp_tcb * 4295 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4296 struct sockaddr *src, struct sockaddr *dst, 4297 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4298 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4299 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4300 uint32_t vrf_id, uint16_t port) 4301 { 4302 struct sctp_association *asoc; 4303 struct mbuf *op_err; 4304 char msg[SCTP_DIAG_INFO_LEN]; 4305 uint32_t vtag_in; 4306 int num_chunks = 0; /* number of control chunks processed */ 4307 uint32_t chk_length, contiguous; 4308 int ret; 4309 int abort_no_unlock = 0; 4310 int ecne_seen = 0; 4311 4312 /* 4313 * How big should this be, and should it be alloc'd? Lets try the 4314 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4315 * until we get into jumbo grams and such.. 4316 */ 4317 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4318 int got_auth = 0; 4319 uint32_t auth_offset = 0, auth_len = 0; 4320 int auth_skipped = 0; 4321 int asconf_cnt = 0; 4322 4323 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4324 iphlen, *offset, length, (void *)stcb); 4325 4326 if (stcb) { 4327 SCTP_TCB_LOCK_ASSERT(stcb); 4328 } 4329 /* validate chunk header length... */ 4330 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4331 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4332 ntohs(ch->chunk_length)); 4333 *offset = length; 4334 return (stcb); 4335 } 4336 /* 4337 * validate the verification tag 4338 */ 4339 vtag_in = ntohl(sh->v_tag); 4340 4341 if (ch->chunk_type == SCTP_INITIATION) { 4342 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4343 ntohs(ch->chunk_length), vtag_in); 4344 if (vtag_in != 0) { 4345 /* protocol error- silently discard... */ 4346 SCTP_STAT_INCR(sctps_badvtag); 4347 if (stcb != NULL) { 4348 SCTP_TCB_UNLOCK(stcb); 4349 } 4350 return (NULL); 4351 } 4352 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4353 /* 4354 * If there is no stcb, skip the AUTH chunk and process 4355 * later after a stcb is found (to validate the lookup was 4356 * valid. 4357 */ 4358 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4359 (stcb == NULL) && 4360 (inp->auth_supported == 1)) { 4361 /* save this chunk for later processing */ 4362 auth_skipped = 1; 4363 auth_offset = *offset; 4364 auth_len = ntohs(ch->chunk_length); 4365 4366 /* (temporarily) move past this chunk */ 4367 *offset += SCTP_SIZE32(auth_len); 4368 if (*offset >= length) { 4369 /* no more data left in the mbuf chain */ 4370 *offset = length; 4371 return (NULL); 4372 } 4373 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4374 sizeof(struct sctp_chunkhdr), chunk_buf); 4375 } 4376 if (ch == NULL) { 4377 /* Help */ 4378 *offset = length; 4379 return (stcb); 4380 } 4381 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4382 goto process_control_chunks; 4383 } 4384 /* 4385 * first check if it's an ASCONF with an unknown src addr we 4386 * need to look inside to find the association 4387 */ 4388 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4389 struct sctp_chunkhdr *asconf_ch = ch; 4390 uint32_t asconf_offset = 0, asconf_len = 0; 4391 4392 /* inp's refcount may be reduced */ 4393 SCTP_INP_INCR_REF(inp); 4394 4395 asconf_offset = *offset; 4396 do { 4397 asconf_len = ntohs(asconf_ch->chunk_length); 4398 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4399 break; 4400 stcb = sctp_findassociation_ep_asconf(m, 4401 *offset, 4402 dst, 4403 sh, &inp, netp, vrf_id); 4404 if (stcb != NULL) 4405 break; 4406 asconf_offset += SCTP_SIZE32(asconf_len); 4407 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4408 sizeof(struct sctp_chunkhdr), chunk_buf); 4409 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4410 if (stcb == NULL) { 4411 /* 4412 * reduce inp's refcount if not reduced in 4413 * sctp_findassociation_ep_asconf(). 4414 */ 4415 SCTP_INP_DECR_REF(inp); 4416 } 4417 4418 /* now go back and verify any auth chunk to be sure */ 4419 if (auth_skipped && (stcb != NULL)) { 4420 struct sctp_auth_chunk *auth; 4421 4422 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4423 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4424 got_auth = 1; 4425 auth_skipped = 0; 4426 } else { 4427 auth = NULL; 4428 } 4429 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4430 auth_offset)) { 4431 /* auth HMAC failed so dump it */ 4432 *offset = length; 4433 return (stcb); 4434 } else { 4435 /* remaining chunks are HMAC checked */ 4436 stcb->asoc.authenticated = 1; 4437 } 4438 } 4439 } 4440 if (stcb == NULL) { 4441 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4442 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4443 msg); 4444 /* no association, so it's out of the blue... */ 4445 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4446 mflowtype, mflowid, inp->fibnum, 4447 vrf_id, port); 4448 *offset = length; 4449 return (NULL); 4450 } 4451 asoc = &stcb->asoc; 4452 /* ABORT and SHUTDOWN can use either v_tag... */ 4453 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4454 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4455 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4456 /* Take the T-bit always into account. */ 4457 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4458 (vtag_in == asoc->my_vtag)) || 4459 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4460 (asoc->peer_vtag != htonl(0)) && 4461 (vtag_in == asoc->peer_vtag))) { 4462 /* this is valid */ 4463 } else { 4464 /* drop this packet... */ 4465 SCTP_STAT_INCR(sctps_badvtag); 4466 if (stcb != NULL) { 4467 SCTP_TCB_UNLOCK(stcb); 4468 } 4469 return (NULL); 4470 } 4471 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4472 if (vtag_in != asoc->my_vtag) { 4473 /* 4474 * this could be a stale SHUTDOWN-ACK or the 4475 * peer never got the SHUTDOWN-COMPLETE and 4476 * is still hung; we have started a new asoc 4477 * but it won't complete until the shutdown 4478 * is completed 4479 */ 4480 if (stcb != NULL) { 4481 SCTP_TCB_UNLOCK(stcb); 4482 } 4483 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4484 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4485 msg); 4486 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4487 sh, inp, op_err, 4488 mflowtype, mflowid, fibnum, 4489 vrf_id, port); 4490 return (NULL); 4491 } 4492 } else { 4493 /* for all other chunks, vtag must match */ 4494 if (vtag_in != asoc->my_vtag) { 4495 /* invalid vtag... */ 4496 SCTPDBG(SCTP_DEBUG_INPUT3, 4497 "invalid vtag: %xh, expect %xh\n", 4498 vtag_in, asoc->my_vtag); 4499 SCTP_STAT_INCR(sctps_badvtag); 4500 if (stcb != NULL) { 4501 SCTP_TCB_UNLOCK(stcb); 4502 } 4503 *offset = length; 4504 return (NULL); 4505 } 4506 } 4507 } /* end if !SCTP_COOKIE_ECHO */ 4508 /* 4509 * process all control chunks... 4510 */ 4511 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4512 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4513 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4514 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4515 /* implied cookie-ack.. we must have lost the ack */ 4516 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4517 *netp); 4518 } 4519 4520 process_control_chunks: 4521 while (IS_SCTP_CONTROL(ch)) { 4522 /* validate chunk length */ 4523 chk_length = ntohs(ch->chunk_length); 4524 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4525 ch->chunk_type, chk_length); 4526 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4527 if (chk_length < sizeof(*ch) || 4528 (*offset + (int)chk_length) > length) { 4529 *offset = length; 4530 return (stcb); 4531 } 4532 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4533 /* 4534 * INIT and INIT-ACK only gets the init ack "header" portion 4535 * only because we don't have to process the peer's COOKIE. 4536 * All others get a complete chunk. 4537 */ 4538 switch (ch->chunk_type) { 4539 case SCTP_INITIATION: 4540 contiguous = sizeof(struct sctp_init_chunk); 4541 break; 4542 case SCTP_INITIATION_ACK: 4543 contiguous = sizeof(struct sctp_init_ack_chunk); 4544 break; 4545 default: 4546 contiguous = min(chk_length, sizeof(chunk_buf)); 4547 break; 4548 } 4549 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4550 contiguous, 4551 chunk_buf); 4552 if (ch == NULL) { 4553 *offset = length; 4554 if (stcb != NULL) { 4555 SCTP_TCB_UNLOCK(stcb); 4556 } 4557 return (NULL); 4558 } 4559 4560 num_chunks++; 4561 /* Save off the last place we got a control from */ 4562 if (stcb != NULL) { 4563 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4564 /* 4565 * allow last_control to be NULL if 4566 * ASCONF... ASCONF processing will find the 4567 * right net later 4568 */ 4569 if ((netp != NULL) && (*netp != NULL)) 4570 stcb->asoc.last_control_chunk_from = *netp; 4571 } 4572 } 4573 #ifdef SCTP_AUDITING_ENABLED 4574 sctp_audit_log(0xB0, ch->chunk_type); 4575 #endif 4576 4577 /* check to see if this chunk required auth, but isn't */ 4578 if ((stcb != NULL) && 4579 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4580 !stcb->asoc.authenticated) { 4581 /* "silently" ignore */ 4582 SCTP_STAT_INCR(sctps_recvauthmissing); 4583 goto next_chunk; 4584 } 4585 switch (ch->chunk_type) { 4586 case SCTP_INITIATION: 4587 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4588 /* The INIT chunk must be the only chunk. */ 4589 if ((num_chunks > 1) || 4590 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4591 /* RFC 4960 requires that no ABORT is sent */ 4592 *offset = length; 4593 if (stcb != NULL) { 4594 SCTP_TCB_UNLOCK(stcb); 4595 } 4596 return (NULL); 4597 } 4598 /* Honor our resource limit. */ 4599 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4600 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4601 sctp_abort_association(inp, stcb, m, iphlen, 4602 src, dst, sh, op_err, 4603 mflowtype, mflowid, 4604 vrf_id, port); 4605 *offset = length; 4606 return (NULL); 4607 } 4608 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4609 (struct sctp_init_chunk *)ch, inp, 4610 stcb, *netp, &abort_no_unlock, 4611 mflowtype, mflowid, 4612 vrf_id, port); 4613 *offset = length; 4614 if ((!abort_no_unlock) && (stcb != NULL)) { 4615 SCTP_TCB_UNLOCK(stcb); 4616 } 4617 return (NULL); 4618 break; 4619 case SCTP_PAD_CHUNK: 4620 break; 4621 case SCTP_INITIATION_ACK: 4622 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4623 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4624 /* We are not interested anymore */ 4625 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4626 ; 4627 } else { 4628 *offset = length; 4629 if (stcb != NULL) { 4630 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4631 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4632 } 4633 return (NULL); 4634 } 4635 } 4636 /* The INIT-ACK chunk must be the only chunk. */ 4637 if ((num_chunks > 1) || 4638 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4639 *offset = length; 4640 return (stcb); 4641 } 4642 if ((netp != NULL) && (*netp != NULL)) { 4643 ret = sctp_handle_init_ack(m, iphlen, *offset, 4644 src, dst, sh, 4645 (struct sctp_init_ack_chunk *)ch, 4646 stcb, *netp, 4647 &abort_no_unlock, 4648 mflowtype, mflowid, 4649 vrf_id); 4650 } else { 4651 ret = -1; 4652 } 4653 *offset = length; 4654 if (abort_no_unlock) { 4655 return (NULL); 4656 } 4657 /* 4658 * Special case, I must call the output routine to 4659 * get the cookie echoed 4660 */ 4661 if ((stcb != NULL) && (ret == 0)) { 4662 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4663 } 4664 return (stcb); 4665 break; 4666 case SCTP_SELECTIVE_ACK: 4667 case SCTP_NR_SELECTIVE_ACK: 4668 { 4669 int abort_now = 0; 4670 uint32_t a_rwnd, cum_ack; 4671 uint16_t num_seg, num_nr_seg, num_dup; 4672 uint8_t flags; 4673 int offset_seg, offset_dup; 4674 4675 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4676 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4677 SCTP_STAT_INCR(sctps_recvsacks); 4678 if (stcb == NULL) { 4679 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4680 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4681 break; 4682 } 4683 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4684 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4685 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4686 break; 4687 } 4688 } else { 4689 if (stcb->asoc.nrsack_supported == 0) { 4690 goto unknown_chunk; 4691 } 4692 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4693 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4694 break; 4695 } 4696 } 4697 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4698 /*- 4699 * If we have sent a shutdown-ack, we will pay no 4700 * attention to a sack sent in to us since 4701 * we don't care anymore. 4702 */ 4703 break; 4704 } 4705 flags = ch->chunk_flags; 4706 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4707 struct sctp_sack_chunk *sack; 4708 4709 sack = (struct sctp_sack_chunk *)ch; 4710 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4711 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4712 num_nr_seg = 0; 4713 num_dup = ntohs(sack->sack.num_dup_tsns); 4714 a_rwnd = ntohl(sack->sack.a_rwnd); 4715 if (sizeof(struct sctp_sack_chunk) + 4716 num_seg * sizeof(struct sctp_gap_ack_block) + 4717 num_dup * sizeof(uint32_t) != chk_length) { 4718 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4719 break; 4720 } 4721 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4722 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4723 } else { 4724 struct sctp_nr_sack_chunk *nr_sack; 4725 4726 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4727 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4728 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4729 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4730 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4731 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4732 if (sizeof(struct sctp_nr_sack_chunk) + 4733 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4734 num_dup * sizeof(uint32_t) != chk_length) { 4735 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4736 break; 4737 } 4738 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4739 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4740 } 4741 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4742 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4743 cum_ack, num_seg, a_rwnd); 4744 stcb->asoc.seen_a_sack_this_pkt = 1; 4745 if ((stcb->asoc.pr_sctp_cnt == 0) && 4746 (num_seg == 0) && (num_nr_seg == 0) && 4747 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4748 (stcb->asoc.saw_sack_with_frags == 0) && 4749 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4750 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4751 /* 4752 * We have a SIMPLE sack having no 4753 * prior segments and data on sent 4754 * queue to be acked. Use the faster 4755 * path sack processing. We also 4756 * allow window update sacks with no 4757 * missing segments to go this way 4758 * too. 4759 */ 4760 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4761 &abort_now, ecne_seen); 4762 } else { 4763 if ((netp != NULL) && (*netp != NULL)) { 4764 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4765 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4766 cum_ack, a_rwnd, ecne_seen); 4767 } 4768 } 4769 if (abort_now) { 4770 /* ABORT signal from sack processing */ 4771 *offset = length; 4772 return (NULL); 4773 } 4774 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4775 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4776 (stcb->asoc.stream_queue_cnt == 0)) { 4777 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4778 } 4779 break; 4780 } 4781 case SCTP_HEARTBEAT_REQUEST: 4782 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4783 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4784 SCTP_STAT_INCR(sctps_recvheartbeat); 4785 sctp_send_heartbeat_ack(stcb, m, *offset, 4786 chk_length, *netp); 4787 } 4788 break; 4789 case SCTP_HEARTBEAT_ACK: 4790 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4791 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4792 /* Its not ours */ 4793 *offset = length; 4794 return (stcb); 4795 } 4796 SCTP_STAT_INCR(sctps_recvheartbeatack); 4797 if ((netp != NULL) && (*netp != NULL)) { 4798 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4799 stcb, *netp); 4800 } 4801 break; 4802 case SCTP_ABORT_ASSOCIATION: 4803 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4804 (void *)stcb); 4805 *offset = length; 4806 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4807 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4808 return (NULL); 4809 } else { 4810 return (stcb); 4811 } 4812 } else { 4813 return (NULL); 4814 } 4815 break; 4816 case SCTP_SHUTDOWN: 4817 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4818 (void *)stcb); 4819 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4820 *offset = length; 4821 return (stcb); 4822 } 4823 if ((netp != NULL) && (*netp != NULL)) { 4824 int abort_flag = 0; 4825 4826 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4827 stcb, *netp, &abort_flag); 4828 if (abort_flag) { 4829 *offset = length; 4830 return (NULL); 4831 } 4832 } 4833 break; 4834 case SCTP_SHUTDOWN_ACK: 4835 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4836 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4837 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4838 } 4839 *offset = length; 4840 return (NULL); 4841 break; 4842 case SCTP_OPERATION_ERROR: 4843 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4844 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4845 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4846 *offset = length; 4847 return (NULL); 4848 } 4849 break; 4850 case SCTP_COOKIE_ECHO: 4851 SCTPDBG(SCTP_DEBUG_INPUT3, 4852 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4853 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4854 ; 4855 } else { 4856 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4857 /* We are not interested anymore */ 4858 abend: 4859 if (stcb != NULL) { 4860 SCTP_TCB_UNLOCK(stcb); 4861 } 4862 *offset = length; 4863 return (NULL); 4864 } 4865 } 4866 /*- 4867 * First are we accepting? We do this again here 4868 * since it is possible that a previous endpoint WAS 4869 * listening responded to a INIT-ACK and then 4870 * closed. We opened and bound.. and are now no 4871 * longer listening. 4872 * 4873 * XXXGL: notes on checking listen queue length. 4874 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4875 * SOLISTENING(), because a listening "UDP type" 4876 * socket isn't listening in terms of the socket 4877 * layer. It is a normal data flow socket, that 4878 * can fork off new connections. Thus, we should 4879 * look into sol_qlen only in case we are !UDP. 4880 * 2) Checking sol_qlen in general requires locking 4881 * the socket, and this code lacks that. 4882 */ 4883 if ((stcb == NULL) && 4884 (!SCTP_IS_LISTENING(inp) || 4885 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4886 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4887 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4888 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4889 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4890 sctp_abort_association(inp, stcb, m, iphlen, 4891 src, dst, sh, op_err, 4892 mflowtype, mflowid, 4893 vrf_id, port); 4894 } 4895 *offset = length; 4896 return (NULL); 4897 } else { 4898 struct mbuf *ret_buf; 4899 struct sctp_inpcb *linp; 4900 struct sctp_tmit_chunk *chk; 4901 4902 if (stcb) { 4903 linp = NULL; 4904 } else { 4905 linp = inp; 4906 } 4907 4908 if (linp != NULL) { 4909 SCTP_ASOC_CREATE_LOCK(linp); 4910 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4911 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4912 SCTP_ASOC_CREATE_UNLOCK(linp); 4913 goto abend; 4914 } 4915 } 4916 4917 if (netp != NULL) { 4918 struct sctp_tcb *locked_stcb; 4919 4920 locked_stcb = stcb; 4921 ret_buf = 4922 sctp_handle_cookie_echo(m, iphlen, 4923 *offset, 4924 src, dst, 4925 sh, 4926 (struct sctp_cookie_echo_chunk *)ch, 4927 &inp, &stcb, netp, 4928 auth_skipped, 4929 auth_offset, 4930 auth_len, 4931 &locked_stcb, 4932 mflowtype, 4933 mflowid, 4934 vrf_id, 4935 port); 4936 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4937 SCTP_TCB_UNLOCK(locked_stcb); 4938 } 4939 if (stcb != NULL) { 4940 SCTP_TCB_LOCK_ASSERT(stcb); 4941 } 4942 } else { 4943 ret_buf = NULL; 4944 } 4945 if (linp != NULL) { 4946 SCTP_ASOC_CREATE_UNLOCK(linp); 4947 } 4948 if (ret_buf == NULL) { 4949 if (stcb != NULL) { 4950 SCTP_TCB_UNLOCK(stcb); 4951 } 4952 SCTPDBG(SCTP_DEBUG_INPUT3, 4953 "GAK, null buffer\n"); 4954 *offset = length; 4955 return (NULL); 4956 } 4957 /* if AUTH skipped, see if it verified... */ 4958 if (auth_skipped) { 4959 got_auth = 1; 4960 auth_skipped = 0; 4961 } 4962 /* Restart the timer if we have pending data */ 4963 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4964 if (chk->whoTo != NULL) { 4965 break; 4966 } 4967 } 4968 if (chk != NULL) { 4969 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4970 } 4971 } 4972 break; 4973 case SCTP_COOKIE_ACK: 4974 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4975 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4976 return (stcb); 4977 } 4978 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4979 /* We are not interested anymore */ 4980 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4981 ; 4982 } else if (stcb) { 4983 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4984 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4985 *offset = length; 4986 return (NULL); 4987 } 4988 } 4989 if ((netp != NULL) && (*netp != NULL)) { 4990 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4991 } 4992 break; 4993 case SCTP_ECN_ECHO: 4994 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 4995 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4996 /* Its not ours */ 4997 *offset = length; 4998 return (stcb); 4999 } 5000 if (stcb->asoc.ecn_supported == 0) { 5001 goto unknown_chunk; 5002 } 5003 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5004 ecne_seen = 1; 5005 break; 5006 case SCTP_ECN_CWR: 5007 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5008 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5009 *offset = length; 5010 return (stcb); 5011 } 5012 if (stcb->asoc.ecn_supported == 0) { 5013 goto unknown_chunk; 5014 } 5015 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5016 break; 5017 case SCTP_SHUTDOWN_COMPLETE: 5018 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5019 /* must be first and only chunk */ 5020 if ((num_chunks > 1) || 5021 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5022 *offset = length; 5023 return (stcb); 5024 } 5025 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5026 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5027 stcb, *netp); 5028 } 5029 *offset = length; 5030 return (NULL); 5031 break; 5032 case SCTP_ASCONF: 5033 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5034 if (stcb != NULL) { 5035 if (stcb->asoc.asconf_supported == 0) { 5036 goto unknown_chunk; 5037 } 5038 sctp_handle_asconf(m, *offset, src, 5039 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5040 asconf_cnt++; 5041 } 5042 break; 5043 case SCTP_ASCONF_ACK: 5044 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5045 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5046 /* Its not ours */ 5047 *offset = length; 5048 return (stcb); 5049 } 5050 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5051 if (stcb->asoc.asconf_supported == 0) { 5052 goto unknown_chunk; 5053 } 5054 /* He's alive so give him credit */ 5055 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5056 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5057 stcb->asoc.overall_error_count, 5058 0, 5059 SCTP_FROM_SCTP_INPUT, 5060 __LINE__); 5061 } 5062 stcb->asoc.overall_error_count = 0; 5063 sctp_handle_asconf_ack(m, *offset, 5064 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5065 if (abort_no_unlock) 5066 return (NULL); 5067 } 5068 break; 5069 case SCTP_FORWARD_CUM_TSN: 5070 case SCTP_IFORWARD_CUM_TSN: 5071 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5072 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5073 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5074 /* Its not ours */ 5075 *offset = length; 5076 return (stcb); 5077 } 5078 5079 if (stcb != NULL) { 5080 int abort_flag = 0; 5081 5082 if (stcb->asoc.prsctp_supported == 0) { 5083 goto unknown_chunk; 5084 } 5085 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5086 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5087 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5088 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5089 } else { 5090 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5091 } 5092 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5093 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 5094 *offset = length; 5095 return (NULL); 5096 } 5097 *fwd_tsn_seen = 1; 5098 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5099 /* We are not interested anymore */ 5100 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5101 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5102 *offset = length; 5103 return (NULL); 5104 } 5105 /* 5106 * For sending a SACK this looks like DATA 5107 * chunks. 5108 */ 5109 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5110 sctp_handle_forward_tsn(stcb, 5111 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5112 if (abort_flag) { 5113 *offset = length; 5114 return (NULL); 5115 } 5116 } 5117 break; 5118 case SCTP_STREAM_RESET: 5119 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5120 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) { 5121 /* Its not ours */ 5122 *offset = length; 5123 return (stcb); 5124 } 5125 if (stcb->asoc.reconfig_supported == 0) { 5126 goto unknown_chunk; 5127 } 5128 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5129 /* stop processing */ 5130 *offset = length; 5131 return (NULL); 5132 } 5133 break; 5134 case SCTP_PACKET_DROPPED: 5135 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5136 /* re-get it all please */ 5137 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5138 /* Its not ours */ 5139 *offset = length; 5140 return (stcb); 5141 } 5142 5143 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5144 if (stcb->asoc.pktdrop_supported == 0) { 5145 goto unknown_chunk; 5146 } 5147 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5148 stcb, *netp, 5149 min(chk_length, contiguous)); 5150 } 5151 break; 5152 case SCTP_AUTHENTICATION: 5153 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5154 if (stcb == NULL) { 5155 /* save the first AUTH for later processing */ 5156 if (auth_skipped == 0) { 5157 auth_offset = *offset; 5158 auth_len = chk_length; 5159 auth_skipped = 1; 5160 } 5161 /* skip this chunk (temporarily) */ 5162 goto next_chunk; 5163 } 5164 if (stcb->asoc.auth_supported == 0) { 5165 goto unknown_chunk; 5166 } 5167 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5168 (chk_length > (sizeof(struct sctp_auth_chunk) + 5169 SCTP_AUTH_DIGEST_LEN_MAX))) { 5170 /* Its not ours */ 5171 *offset = length; 5172 return (stcb); 5173 } 5174 if (got_auth == 1) { 5175 /* skip this chunk... it's already auth'd */ 5176 goto next_chunk; 5177 } 5178 got_auth = 1; 5179 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5180 /* auth HMAC failed so dump the packet */ 5181 *offset = length; 5182 return (stcb); 5183 } else { 5184 /* remaining chunks are HMAC checked */ 5185 stcb->asoc.authenticated = 1; 5186 } 5187 break; 5188 5189 default: 5190 unknown_chunk: 5191 /* it's an unknown chunk! */ 5192 if ((ch->chunk_type & 0x40) && 5193 (stcb != NULL) && 5194 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5195 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5196 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5197 struct sctp_gen_error_cause *cause; 5198 int len; 5199 5200 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5201 0, M_NOWAIT, 1, MT_DATA); 5202 if (op_err != NULL) { 5203 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5204 cause = mtod(op_err, struct sctp_gen_error_cause *); 5205 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5206 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5207 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5208 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5209 if (SCTP_BUF_NEXT(op_err) != NULL) { 5210 #ifdef SCTP_MBUF_LOGGING 5211 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5212 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5213 } 5214 #endif 5215 sctp_queue_op_err(stcb, op_err); 5216 } else { 5217 sctp_m_freem(op_err); 5218 } 5219 } 5220 } 5221 if ((ch->chunk_type & 0x80) == 0) { 5222 /* discard this packet */ 5223 *offset = length; 5224 return (stcb); 5225 } /* else skip this bad chunk and continue... */ 5226 break; 5227 } /* switch (ch->chunk_type) */ 5228 5229 next_chunk: 5230 /* get the next chunk */ 5231 *offset += SCTP_SIZE32(chk_length); 5232 if (*offset >= length) { 5233 /* no more data left in the mbuf chain */ 5234 break; 5235 } 5236 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5237 sizeof(struct sctp_chunkhdr), chunk_buf); 5238 if (ch == NULL) { 5239 *offset = length; 5240 return (stcb); 5241 } 5242 } /* while */ 5243 5244 if ((asconf_cnt > 0) && (stcb != NULL)) { 5245 sctp_send_asconf_ack(stcb); 5246 } 5247 return (stcb); 5248 } 5249 5250 /* 5251 * common input chunk processing (v4 and v6) 5252 */ 5253 void 5254 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5255 struct sockaddr *src, struct sockaddr *dst, 5256 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5257 uint8_t compute_crc, 5258 uint8_t ecn_bits, 5259 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5260 uint32_t vrf_id, uint16_t port) 5261 { 5262 uint32_t high_tsn; 5263 int fwd_tsn_seen = 0, data_processed = 0; 5264 struct mbuf *m = *mm, *op_err; 5265 char msg[SCTP_DIAG_INFO_LEN]; 5266 int un_sent; 5267 int cnt_ctrl_ready = 0; 5268 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5269 struct sctp_tcb *stcb = NULL; 5270 struct sctp_nets *net = NULL; 5271 5272 SCTP_STAT_INCR(sctps_recvdatagrams); 5273 #ifdef SCTP_AUDITING_ENABLED 5274 sctp_audit_log(0xE0, 1); 5275 sctp_auditing(0, inp, stcb, net); 5276 #endif 5277 if (compute_crc != 0) { 5278 uint32_t check, calc_check; 5279 5280 check = sh->checksum; 5281 sh->checksum = 0; 5282 calc_check = sctp_calculate_cksum(m, iphlen); 5283 sh->checksum = check; 5284 if (calc_check != check) { 5285 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5286 calc_check, check, (void *)m, length, iphlen); 5287 stcb = sctp_findassociation_addr(m, offset, src, dst, 5288 sh, ch, &inp, &net, vrf_id); 5289 #if defined(INET) || defined(INET6) 5290 if ((ch->chunk_type != SCTP_INITIATION) && 5291 (net != NULL) && (net->port != port)) { 5292 if (net->port == 0) { 5293 /* UDP encapsulation turned on. */ 5294 net->mtu -= sizeof(struct udphdr); 5295 if (stcb->asoc.smallest_mtu > net->mtu) { 5296 sctp_pathmtu_adjustment(stcb, net->mtu); 5297 } 5298 } else if (port == 0) { 5299 /* UDP encapsulation turned off. */ 5300 net->mtu += sizeof(struct udphdr); 5301 /* XXX Update smallest_mtu */ 5302 } 5303 net->port = port; 5304 } 5305 #endif 5306 if (net != NULL) { 5307 net->flowtype = mflowtype; 5308 net->flowid = mflowid; 5309 } 5310 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5311 if ((inp != NULL) && (stcb != NULL)) { 5312 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5313 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5314 } else if ((inp != NULL) && (stcb == NULL)) { 5315 inp_decr = inp; 5316 } 5317 SCTP_STAT_INCR(sctps_badsum); 5318 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5319 goto out; 5320 } 5321 } 5322 /* Destination port of 0 is illegal, based on RFC4960. */ 5323 if (sh->dest_port == 0) { 5324 SCTP_STAT_INCR(sctps_hdrops); 5325 goto out; 5326 } 5327 stcb = sctp_findassociation_addr(m, offset, src, dst, 5328 sh, ch, &inp, &net, vrf_id); 5329 #if defined(INET) || defined(INET6) 5330 if ((ch->chunk_type != SCTP_INITIATION) && 5331 (net != NULL) && (net->port != port)) { 5332 if (net->port == 0) { 5333 /* UDP encapsulation turned on. */ 5334 net->mtu -= sizeof(struct udphdr); 5335 if (stcb->asoc.smallest_mtu > net->mtu) { 5336 sctp_pathmtu_adjustment(stcb, net->mtu); 5337 } 5338 } else if (port == 0) { 5339 /* UDP encapsulation turned off. */ 5340 net->mtu += sizeof(struct udphdr); 5341 /* XXX Update smallest_mtu */ 5342 } 5343 net->port = port; 5344 } 5345 #endif 5346 if (net != NULL) { 5347 net->flowtype = mflowtype; 5348 net->flowid = mflowid; 5349 } 5350 if (inp == NULL) { 5351 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5352 SCTP_STAT_INCR(sctps_noport); 5353 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5354 goto out; 5355 } 5356 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5357 sctp_send_shutdown_complete2(src, dst, sh, 5358 mflowtype, mflowid, fibnum, 5359 vrf_id, port); 5360 goto out; 5361 } 5362 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5363 goto out; 5364 } 5365 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5366 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5367 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5368 (ch->chunk_type != SCTP_INIT))) { 5369 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5370 "Out of the blue"); 5371 sctp_send_abort(m, iphlen, src, dst, 5372 sh, 0, op_err, 5373 mflowtype, mflowid, fibnum, 5374 vrf_id, port); 5375 } 5376 } 5377 goto out; 5378 } else if (stcb == NULL) { 5379 inp_decr = inp; 5380 } 5381 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5382 (void *)m, iphlen, offset, length, (void *)stcb); 5383 if (stcb) { 5384 /* always clear this before beginning a packet */ 5385 stcb->asoc.authenticated = 0; 5386 stcb->asoc.seen_a_sack_this_pkt = 0; 5387 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5388 (void *)stcb, stcb->asoc.state); 5389 5390 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5391 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5392 /*- 5393 * If we hit here, we had a ref count 5394 * up when the assoc was aborted and the 5395 * timer is clearing out the assoc, we should 5396 * NOT respond to any packet.. its OOTB. 5397 */ 5398 SCTP_TCB_UNLOCK(stcb); 5399 stcb = NULL; 5400 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5401 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5402 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5403 msg); 5404 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5405 mflowtype, mflowid, inp->fibnum, 5406 vrf_id, port); 5407 goto out; 5408 } 5409 } 5410 if (IS_SCTP_CONTROL(ch)) { 5411 /* process the control portion of the SCTP packet */ 5412 /* sa_ignore NO_NULL_CHK */ 5413 stcb = sctp_process_control(m, iphlen, &offset, length, 5414 src, dst, sh, ch, 5415 inp, stcb, &net, &fwd_tsn_seen, 5416 mflowtype, mflowid, fibnum, 5417 vrf_id, port); 5418 if (stcb) { 5419 /* 5420 * This covers us if the cookie-echo was there and 5421 * it changes our INP. 5422 */ 5423 inp = stcb->sctp_ep; 5424 #if defined(INET) || defined(INET6) 5425 if ((ch->chunk_type != SCTP_INITIATION) && 5426 (net != NULL) && (net->port != port)) { 5427 if (net->port == 0) { 5428 /* UDP encapsulation turned on. */ 5429 net->mtu -= sizeof(struct udphdr); 5430 if (stcb->asoc.smallest_mtu > net->mtu) { 5431 sctp_pathmtu_adjustment(stcb, net->mtu); 5432 } 5433 } else if (port == 0) { 5434 /* UDP encapsulation turned off. */ 5435 net->mtu += sizeof(struct udphdr); 5436 /* XXX Update smallest_mtu */ 5437 } 5438 net->port = port; 5439 } 5440 #endif 5441 } 5442 } else { 5443 /* 5444 * no control chunks, so pre-process DATA chunks (these 5445 * checks are taken care of by control processing) 5446 */ 5447 5448 /* 5449 * if DATA only packet, and auth is required, then punt... 5450 * can't have authenticated without any AUTH (control) 5451 * chunks 5452 */ 5453 if ((stcb != NULL) && 5454 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5455 /* "silently" ignore */ 5456 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5457 SCTP_STAT_INCR(sctps_recvauthmissing); 5458 goto out; 5459 } 5460 if (stcb == NULL) { 5461 /* out of the blue DATA chunk */ 5462 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5463 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5464 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5465 msg); 5466 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5467 mflowtype, mflowid, fibnum, 5468 vrf_id, port); 5469 goto out; 5470 } 5471 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5472 /* v_tag mismatch! */ 5473 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5474 SCTP_STAT_INCR(sctps_badvtag); 5475 goto out; 5476 } 5477 } 5478 5479 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5480 if (stcb == NULL) { 5481 /* 5482 * no valid TCB for this packet, or we found it's a bad 5483 * packet while processing control, or we're done with this 5484 * packet (done or skip rest of data), so we drop it... 5485 */ 5486 goto out; 5487 } 5488 5489 /* 5490 * DATA chunk processing 5491 */ 5492 /* plow through the data chunks while length > offset */ 5493 5494 /* 5495 * Rest should be DATA only. Check authentication state if AUTH for 5496 * DATA is required. 5497 */ 5498 if ((length > offset) && 5499 (stcb != NULL) && 5500 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5501 !stcb->asoc.authenticated) { 5502 /* "silently" ignore */ 5503 SCTP_STAT_INCR(sctps_recvauthmissing); 5504 SCTPDBG(SCTP_DEBUG_AUTH1, 5505 "Data chunk requires AUTH, skipped\n"); 5506 goto trigger_send; 5507 } 5508 if (length > offset) { 5509 int retval; 5510 5511 /* 5512 * First check to make sure our state is correct. We would 5513 * not get here unless we really did have a tag, so we don't 5514 * abort if this happens, just dump the chunk silently. 5515 */ 5516 switch (SCTP_GET_STATE(stcb)) { 5517 case SCTP_STATE_COOKIE_ECHOED: 5518 /* 5519 * we consider data with valid tags in this state 5520 * shows us the cookie-ack was lost. Imply it was 5521 * there. 5522 */ 5523 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5524 break; 5525 case SCTP_STATE_COOKIE_WAIT: 5526 /* 5527 * We consider OOTB any data sent during asoc setup. 5528 */ 5529 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5530 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5531 msg); 5532 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5533 mflowtype, mflowid, inp->fibnum, 5534 vrf_id, port); 5535 goto out; 5536 /* sa_ignore NOTREACHED */ 5537 break; 5538 case SCTP_STATE_EMPTY: /* should not happen */ 5539 case SCTP_STATE_INUSE: /* should not happen */ 5540 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5541 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5542 default: 5543 goto out; 5544 /* sa_ignore NOTREACHED */ 5545 break; 5546 case SCTP_STATE_OPEN: 5547 case SCTP_STATE_SHUTDOWN_SENT: 5548 break; 5549 } 5550 /* plow through the data chunks while length > offset */ 5551 retval = sctp_process_data(mm, iphlen, &offset, length, 5552 inp, stcb, net, &high_tsn); 5553 if (retval == 2) { 5554 /* 5555 * The association aborted, NO UNLOCK needed since 5556 * the association is destroyed. 5557 */ 5558 stcb = NULL; 5559 goto out; 5560 } 5561 data_processed = 1; 5562 /* 5563 * Anything important needs to have been m_copy'ed in 5564 * process_data 5565 */ 5566 } 5567 5568 /* take care of ecn */ 5569 if ((data_processed == 1) && 5570 (stcb->asoc.ecn_supported == 1) && 5571 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5572 /* Yep, we need to add a ECNE */ 5573 sctp_send_ecn_echo(stcb, net, high_tsn); 5574 } 5575 5576 if ((data_processed == 0) && (fwd_tsn_seen)) { 5577 int was_a_gap; 5578 uint32_t highest_tsn; 5579 5580 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5581 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5582 } else { 5583 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5584 } 5585 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5586 stcb->asoc.send_sack = 1; 5587 sctp_sack_check(stcb, was_a_gap); 5588 } else if (fwd_tsn_seen) { 5589 stcb->asoc.send_sack = 1; 5590 } 5591 /* trigger send of any chunks in queue... */ 5592 trigger_send: 5593 #ifdef SCTP_AUDITING_ENABLED 5594 sctp_audit_log(0xE0, 2); 5595 sctp_auditing(1, inp, stcb, net); 5596 #endif 5597 SCTPDBG(SCTP_DEBUG_INPUT1, 5598 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5599 stcb->asoc.peers_rwnd, 5600 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5601 stcb->asoc.total_flight); 5602 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5603 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5604 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5605 } 5606 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5607 cnt_ctrl_ready || 5608 stcb->asoc.trigger_reset || 5609 ((un_sent > 0) && 5610 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5611 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5612 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5613 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5614 } 5615 #ifdef SCTP_AUDITING_ENABLED 5616 sctp_audit_log(0xE0, 3); 5617 sctp_auditing(2, inp, stcb, net); 5618 #endif 5619 out: 5620 if (stcb != NULL) { 5621 SCTP_TCB_UNLOCK(stcb); 5622 } 5623 if (inp_decr != NULL) { 5624 /* reduce ref-count */ 5625 SCTP_INP_WLOCK(inp_decr); 5626 SCTP_INP_DECR_REF(inp_decr); 5627 SCTP_INP_WUNLOCK(inp_decr); 5628 } 5629 return; 5630 } 5631 5632 #ifdef INET 5633 void 5634 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5635 { 5636 struct mbuf *m; 5637 int iphlen; 5638 uint32_t vrf_id = 0; 5639 uint8_t ecn_bits; 5640 struct sockaddr_in src, dst; 5641 struct ip *ip; 5642 struct sctphdr *sh; 5643 struct sctp_chunkhdr *ch; 5644 int length, offset; 5645 uint8_t compute_crc; 5646 uint32_t mflowid; 5647 uint8_t mflowtype; 5648 uint16_t fibnum; 5649 5650 iphlen = off; 5651 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5652 SCTP_RELEASE_PKT(i_pak); 5653 return; 5654 } 5655 m = SCTP_HEADER_TO_CHAIN(i_pak); 5656 #ifdef SCTP_MBUF_LOGGING 5657 /* Log in any input mbufs */ 5658 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5659 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5660 } 5661 #endif 5662 #ifdef SCTP_PACKET_LOGGING 5663 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5664 sctp_packet_log(m); 5665 } 5666 #endif 5667 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5668 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5669 m->m_pkthdr.len, 5670 if_name(m->m_pkthdr.rcvif), 5671 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5672 mflowid = m->m_pkthdr.flowid; 5673 mflowtype = M_HASHTYPE_GET(m); 5674 fibnum = M_GETFIB(m); 5675 SCTP_STAT_INCR(sctps_recvpackets); 5676 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5677 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5678 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5679 if (SCTP_BUF_LEN(m) < offset) { 5680 if ((m = m_pullup(m, offset)) == NULL) { 5681 SCTP_STAT_INCR(sctps_hdrops); 5682 return; 5683 } 5684 } 5685 ip = mtod(m, struct ip *); 5686 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5687 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5688 offset -= sizeof(struct sctp_chunkhdr); 5689 memset(&src, 0, sizeof(struct sockaddr_in)); 5690 src.sin_family = AF_INET; 5691 src.sin_len = sizeof(struct sockaddr_in); 5692 src.sin_port = sh->src_port; 5693 src.sin_addr = ip->ip_src; 5694 memset(&dst, 0, sizeof(struct sockaddr_in)); 5695 dst.sin_family = AF_INET; 5696 dst.sin_len = sizeof(struct sockaddr_in); 5697 dst.sin_port = sh->dest_port; 5698 dst.sin_addr = ip->ip_dst; 5699 length = ntohs(ip->ip_len); 5700 /* Validate mbuf chain length with IP payload length. */ 5701 if (SCTP_HEADER_LEN(m) != length) { 5702 SCTPDBG(SCTP_DEBUG_INPUT1, 5703 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5704 SCTP_STAT_INCR(sctps_hdrops); 5705 goto out; 5706 } 5707 /* SCTP does not allow broadcasts or multicasts */ 5708 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5709 goto out; 5710 } 5711 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5712 goto out; 5713 } 5714 ecn_bits = ip->ip_tos; 5715 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5716 SCTP_STAT_INCR(sctps_recvhwcrc); 5717 compute_crc = 0; 5718 } else { 5719 SCTP_STAT_INCR(sctps_recvswcrc); 5720 compute_crc = 1; 5721 } 5722 sctp_common_input_processing(&m, iphlen, offset, length, 5723 (struct sockaddr *)&src, 5724 (struct sockaddr *)&dst, 5725 sh, ch, 5726 compute_crc, 5727 ecn_bits, 5728 mflowtype, mflowid, fibnum, 5729 vrf_id, port); 5730 out: 5731 if (m) { 5732 sctp_m_freem(m); 5733 } 5734 return; 5735 } 5736 5737 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5738 extern int *sctp_cpuarry; 5739 #endif 5740 5741 int 5742 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5743 { 5744 struct mbuf *m; 5745 int off; 5746 5747 m = *mp; 5748 off = *offp; 5749 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5750 if (mp_ncpus > 1) { 5751 struct ip *ip; 5752 struct sctphdr *sh; 5753 int offset; 5754 int cpu_to_use; 5755 uint32_t flowid, tag; 5756 5757 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5758 flowid = m->m_pkthdr.flowid; 5759 } else { 5760 /* 5761 * No flow id built by lower layers fix it so we 5762 * create one. 5763 */ 5764 offset = off + sizeof(struct sctphdr); 5765 if (SCTP_BUF_LEN(m) < offset) { 5766 if ((m = m_pullup(m, offset)) == NULL) { 5767 SCTP_STAT_INCR(sctps_hdrops); 5768 return (IPPROTO_DONE); 5769 } 5770 } 5771 ip = mtod(m, struct ip *); 5772 sh = (struct sctphdr *)((caddr_t)ip + off); 5773 tag = htonl(sh->v_tag); 5774 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5775 m->m_pkthdr.flowid = flowid; 5776 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5777 } 5778 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5779 sctp_queue_to_mcore(m, off, cpu_to_use); 5780 return (IPPROTO_DONE); 5781 } 5782 #endif 5783 sctp_input_with_port(m, off, 0); 5784 return (IPPROTO_DONE); 5785 } 5786 #endif 5787