1 /*- 2 * Copyright (c) 2001-2007, Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 48 49 50 51 static void 52 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 53 { 54 struct sctp_nets *net; 55 56 /* 57 * This now not only stops all cookie timers it also stops any INIT 58 * timers as well. This will make sure that the timers are stopped 59 * in all collision cases. 60 */ 61 SCTP_TCB_LOCK_ASSERT(stcb); 62 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 63 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 64 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 65 stcb->sctp_ep, 66 stcb, 67 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 68 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 69 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 70 stcb->sctp_ep, 71 stcb, 72 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 73 } 74 } 75 } 76 77 /* INIT handler */ 78 static void 79 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 80 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 81 struct sctp_nets *net) 82 { 83 struct sctp_init *init; 84 struct mbuf *op_err; 85 uint32_t init_limit; 86 87 #ifdef SCTP_DEBUG 88 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 89 printf("sctp_handle_init: handling INIT tcb:%p\n", stcb); 90 } 91 #endif 92 op_err = NULL; 93 init = &cp->init; 94 /* First are we accepting? */ 95 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 96 #ifdef SCTP_DEBUG 97 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 98 printf("sctp_handle_init: Abort, so_qlimit:%d\n", inp->sctp_socket->so_qlimit); 99 } 100 #endif 101 /* 102 * FIX ME ?? What about TCP model and we have a 103 * match/restart case? 104 */ 105 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 106 return; 107 } 108 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 109 /* Invalid length */ 110 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 111 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 112 return; 113 } 114 /* validate parameters */ 115 if (init->initiate_tag == 0) { 116 /* protocol error... send abort */ 117 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 118 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 119 return; 120 } 121 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 122 /* invalid parameter... send abort */ 123 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 124 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 125 return; 126 } 127 if (init->num_inbound_streams == 0) { 128 /* protocol error... send abort */ 129 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 130 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 131 return; 132 } 133 if (init->num_outbound_streams == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 136 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 137 return; 138 } 139 init_limit = offset + ntohs(cp->ch.chunk_length); 140 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 141 init_limit)) { 142 /* auth parameter(s) error... send abort */ 143 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL); 144 return; 145 } 146 /* send an INIT-ACK w/cookie */ 147 #ifdef SCTP_DEBUG 148 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 149 printf("sctp_handle_init: sending INIT-ACK\n"); 150 } 151 #endif 152 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp); 153 } 154 155 /* 156 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 157 */ 158 static int 159 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 160 struct sctp_nets *net) 161 { 162 struct sctp_init *init; 163 struct sctp_association *asoc; 164 struct sctp_nets *lnet; 165 unsigned int i; 166 167 init = &cp->init; 168 asoc = &stcb->asoc; 169 /* save off parameters */ 170 asoc->peer_vtag = ntohl(init->initiate_tag); 171 asoc->peers_rwnd = ntohl(init->a_rwnd); 172 if (TAILQ_FIRST(&asoc->nets)) { 173 /* update any ssthresh's that may have a default */ 174 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 175 lnet->ssthresh = asoc->peers_rwnd; 176 177 #if defined(SCTP_CWND_MONITOR) || defined(SCTP_CWND_LOGGING) 178 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 179 #endif 180 181 } 182 } 183 SCTP_TCB_SEND_LOCK(stcb); 184 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 185 unsigned int newcnt; 186 struct sctp_stream_out *outs; 187 struct sctp_stream_queue_pending *sp; 188 189 /* cut back on number of streams */ 190 newcnt = ntohs(init->num_inbound_streams); 191 /* This if is probably not needed but I am cautious */ 192 if (asoc->strmout) { 193 /* First make sure no data chunks are trapped */ 194 for (i = newcnt; i < asoc->pre_open_streams; i++) { 195 outs = &asoc->strmout[i]; 196 sp = TAILQ_FIRST(&outs->outqueue); 197 while (sp) { 198 TAILQ_REMOVE(&outs->outqueue, sp, 199 next); 200 asoc->stream_queue_cnt--; 201 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 202 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 203 sp); 204 if (sp->data) { 205 sctp_m_freem(sp->data); 206 sp->data = NULL; 207 } 208 sctp_free_remote_addr(sp->net); 209 sp->net = NULL; 210 /* Free the chunk */ 211 printf("sp:%p tcb:%p weird free case\n", 212 sp, stcb); 213 214 sctp_free_a_strmoq(stcb, sp); 215 sp = TAILQ_FIRST(&outs->outqueue); 216 } 217 } 218 } 219 /* cut back the count and abandon the upper streams */ 220 asoc->pre_open_streams = newcnt; 221 } 222 SCTP_TCB_SEND_UNLOCK(stcb); 223 asoc->streamoutcnt = asoc->pre_open_streams; 224 /* init tsn's */ 225 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 226 #ifdef SCTP_MAP_LOGGING 227 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 228 #endif 229 /* This is the next one we expect */ 230 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 231 232 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 233 asoc->cumulative_tsn = asoc->asconf_seq_in; 234 asoc->last_echo_tsn = asoc->asconf_seq_in; 235 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 236 /* open the requested streams */ 237 if (asoc->strmin != NULL) { 238 /* Free the old ones */ 239 struct sctp_queued_to_read *ctl; 240 241 for (i = 0; i < asoc->streamincnt; i++) { 242 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 243 while (ctl) { 244 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 245 sctp_free_remote_addr(ctl->whoFrom); 246 sctp_m_freem(ctl->data); 247 ctl->data = NULL; 248 sctp_free_a_readq(stcb, ctl); 249 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 250 } 251 } 252 SCTP_FREE(asoc->strmin); 253 } 254 asoc->streamincnt = ntohs(init->num_outbound_streams); 255 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 256 asoc->streamincnt = MAX_SCTP_STREAMS; 257 } 258 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 259 sizeof(struct sctp_stream_in), "StreamsIn"); 260 if (asoc->strmin == NULL) { 261 /* we didn't get memory for the streams! */ 262 #ifdef SCTP_DEBUG 263 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 264 printf("process_init: couldn't get memory for the streams!\n"); 265 } 266 #endif 267 return (-1); 268 } 269 for (i = 0; i < asoc->streamincnt; i++) { 270 asoc->strmin[i].stream_no = i; 271 asoc->strmin[i].last_sequence_delivered = 0xffff; 272 /* 273 * U-stream ranges will be set when the cookie is unpacked. 274 * Or for the INIT sender they are un set (if pr-sctp not 275 * supported) when the INIT-ACK arrives. 276 */ 277 TAILQ_INIT(&asoc->strmin[i].inqueue); 278 /* 279 * we are not on any wheel, pr-sctp streams will go on the 280 * wheel when they have data waiting for reorder. 281 */ 282 asoc->strmin[i].next_spoke.tqe_next = 0; 283 asoc->strmin[i].next_spoke.tqe_prev = 0; 284 } 285 286 /* 287 * load_address_from_init will put the addresses into the 288 * association when the COOKIE is processed or the INIT-ACK is 289 * processed. Both types of COOKIE's existing and new call this 290 * routine. It will remove addresses that are no longer in the 291 * association (for the restarting case where addresses are 292 * removed). Up front when the INIT arrives we will discard it if it 293 * is a restart and new addresses have been added. 294 */ 295 return (0); 296 } 297 298 /* 299 * INIT-ACK message processing/consumption returns value < 0 on error 300 */ 301 static int 302 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 303 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 304 struct sctp_nets *net) 305 { 306 struct sctp_association *asoc; 307 struct mbuf *op_err; 308 int retval, abort_flag; 309 uint32_t initack_limit; 310 311 /* First verify that we have no illegal param's */ 312 abort_flag = 0; 313 op_err = NULL; 314 315 op_err = sctp_arethere_unrecognized_parameters(m, 316 (offset + sizeof(struct sctp_init_chunk)), 317 &abort_flag, (struct sctp_chunkhdr *)cp); 318 if (abort_flag) { 319 /* Send an abort and notify peer */ 320 if (op_err != NULL) { 321 sctp_send_operr_to(m, iphlen, op_err, cp->init.initiate_tag); 322 } else { 323 /* 324 * Just notify (abort_assoc does this if we send an 325 * abort). 326 */ 327 sctp_abort_notification(stcb, 0); 328 /* 329 * No sense in further INIT's since we will get the 330 * same param back 331 */ 332 sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 333 } 334 return (-1); 335 } 336 asoc = &stcb->asoc; 337 /* process the peer's parameters in the INIT-ACK */ 338 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 339 if (retval < 0) { 340 return (retval); 341 } 342 initack_limit = offset + ntohs(cp->ch.chunk_length); 343 /* load all addresses */ 344 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 345 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 346 NULL))) { 347 /* Huh, we should abort */ 348 #ifdef SCTP_DEBUG 349 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 350 printf("Load addresses from INIT causes an abort %d\n", retval); 351 } 352 #endif 353 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 354 NULL); 355 return (-1); 356 } 357 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 358 stcb->asoc.local_hmacs); 359 if (op_err) { 360 sctp_queue_op_err(stcb, op_err); 361 /* queuing will steal away the mbuf chain to the out queue */ 362 op_err = NULL; 363 } 364 /* extract the cookie and queue it to "echo" it back... */ 365 stcb->asoc.overall_error_count = 0; 366 net->error_count = 0; 367 368 /* 369 * Cancel the INIT timer, We do this first before queueing the 370 * cookie. We always cancel at the primary to assue that we are 371 * canceling the timer started by the INIT which always goes to the 372 * primary. 373 */ 374 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 375 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 376 377 /* calculate the RTO */ 378 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered); 379 380 retval = sctp_send_cookie_echo(m, offset, stcb, net); 381 if (retval < 0) { 382 /* 383 * No cookie, we probably should send a op error. But in any 384 * case if there is no cookie in the INIT-ACK, we can 385 * abandon the peer, its broke. 386 */ 387 if (retval == -3) { 388 /* We abort with an error of missing mandatory param */ 389 struct mbuf *op_err; 390 391 op_err = 392 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 393 if (op_err) { 394 /* 395 * Expand beyond to include the mandatory 396 * param cookie 397 */ 398 struct sctp_inv_mandatory_param *mp; 399 400 SCTP_BUF_LEN(op_err) = 401 sizeof(struct sctp_inv_mandatory_param); 402 mp = mtod(op_err, 403 struct sctp_inv_mandatory_param *); 404 /* Subtract the reserved param */ 405 mp->length = 406 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 407 mp->num_param = htonl(1); 408 mp->param = htons(SCTP_STATE_COOKIE); 409 mp->resv = 0; 410 } 411 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 412 sh, op_err); 413 } 414 return (retval); 415 } 416 return (0); 417 } 418 419 static void 420 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 421 struct sctp_tcb *stcb, struct sctp_nets *net) 422 { 423 struct sockaddr_storage store; 424 struct sockaddr_in *sin; 425 struct sockaddr_in6 *sin6; 426 struct sctp_nets *r_net; 427 struct timeval tv; 428 429 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 430 /* Invalid length */ 431 return; 432 } 433 sin = (struct sockaddr_in *)&store; 434 sin6 = (struct sockaddr_in6 *)&store; 435 436 memset(&store, 0, sizeof(store)); 437 if (cp->heartbeat.hb_info.addr_family == AF_INET && 438 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 439 sin->sin_family = cp->heartbeat.hb_info.addr_family; 440 sin->sin_len = cp->heartbeat.hb_info.addr_len; 441 sin->sin_port = stcb->rport; 442 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 443 sizeof(sin->sin_addr)); 444 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 445 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 446 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 447 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 448 sin6->sin6_port = stcb->rport; 449 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 450 sizeof(sin6->sin6_addr)); 451 } else { 452 return; 453 } 454 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 455 if (r_net == NULL) { 456 #ifdef SCTP_DEBUG 457 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 458 printf("Huh? I can't find the address I sent it to, discard\n"); 459 } 460 #endif 461 return; 462 } 463 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 464 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 465 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 466 /* 467 * If the its a HB and it's random value is correct when can 468 * confirm the destination. 469 */ 470 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 471 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 472 stcb->asoc.primary_destination = r_net; 473 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 474 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 475 r_net = TAILQ_FIRST(&stcb->asoc.nets); 476 if (r_net != stcb->asoc.primary_destination) { 477 /* 478 * first one on the list is NOT the primary 479 * sctp_cmpaddr() is much more efficent if 480 * the primary is the first on the list, 481 * make it so. 482 */ 483 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 484 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 485 } 486 } 487 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 488 stcb, 0, (void *)r_net); 489 } 490 r_net->error_count = 0; 491 r_net->hb_responded = 1; 492 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 493 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 494 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 495 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 496 r_net->dest_state |= SCTP_ADDR_REACHABLE; 497 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 498 SCTP_HEARTBEAT_SUCCESS, (void *)r_net); 499 /* now was it the primary? if so restore */ 500 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 501 sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 502 } 503 } 504 /* Now lets do a RTO with this */ 505 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv); 506 } 507 508 static void 509 sctp_handle_abort(struct sctp_abort_chunk *cp, 510 struct sctp_tcb *stcb, struct sctp_nets *net) 511 { 512 513 #ifdef SCTP_DEBUG 514 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 515 printf("sctp_handle_abort: handling ABORT\n"); 516 } 517 #endif 518 if (stcb == NULL) 519 return; 520 /* verify that the destination addr is in the association */ 521 /* ignore abort for addresses being deleted */ 522 523 /* stop any receive timers */ 524 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 525 /* notify user of the abort and clean up... */ 526 sctp_abort_notification(stcb, 0); 527 /* free the tcb */ 528 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 529 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 530 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 531 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 532 } 533 sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 534 #ifdef SCTP_DEBUG 535 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 536 printf("sctp_handle_abort: finished\n"); 537 } 538 #endif 539 } 540 541 static void 542 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 543 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 544 { 545 struct sctp_association *asoc; 546 int some_on_streamwheel; 547 548 #ifdef SCTP_DEBUG 549 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 550 printf("sctp_handle_shutdown: handling SHUTDOWN\n"); 551 } 552 #endif 553 if (stcb == NULL) 554 return; 555 asoc = &stcb->asoc; 556 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 557 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 558 return; 559 } 560 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 561 /* Shutdown NOT the expected size */ 562 return; 563 } else { 564 sctp_update_acked(stcb, cp, net, abort_flag); 565 } 566 if (asoc->control_pdapi) { 567 /* 568 * With a normal shutdown we assume the end of last record. 569 */ 570 SCTP_INP_READ_LOCK(stcb->sctp_ep); 571 asoc->control_pdapi->end_added = 1; 572 asoc->control_pdapi->pdapi_aborted = 1; 573 asoc->control_pdapi = NULL; 574 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 575 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 576 } 577 /* goto SHUTDOWN_RECEIVED state to block new requests */ 578 if (stcb->sctp_socket) { 579 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 580 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 581 asoc->state = SCTP_STATE_SHUTDOWN_RECEIVED; 582 /* 583 * notify upper layer that peer has initiated a 584 * shutdown 585 */ 586 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL); 587 588 /* reset time */ 589 SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 590 } 591 } 592 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 593 /* 594 * stop the shutdown timer, since we WILL move to 595 * SHUTDOWN-ACK-SENT. 596 */ 597 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 598 } 599 /* Now are we there yet? */ 600 some_on_streamwheel = 0; 601 if (!TAILQ_EMPTY(&asoc->out_wheel)) { 602 /* Check to see if some data queued */ 603 struct sctp_stream_out *outs; 604 605 TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) { 606 if (!TAILQ_EMPTY(&outs->outqueue)) { 607 some_on_streamwheel = 1; 608 break; 609 } 610 } 611 } 612 if (!TAILQ_EMPTY(&asoc->send_queue) || 613 !TAILQ_EMPTY(&asoc->sent_queue) || 614 some_on_streamwheel) { 615 /* By returning we will push more data out */ 616 return; 617 } else { 618 /* no outstanding data to send, so move on... */ 619 /* send SHUTDOWN-ACK */ 620 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 621 /* move to SHUTDOWN-ACK-SENT state */ 622 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 623 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 624 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 625 } 626 asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT; 627 628 /* start SHUTDOWN timer */ 629 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 630 stcb, net); 631 } 632 } 633 634 static void 635 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 636 struct sctp_tcb *stcb, struct sctp_nets *net) 637 { 638 struct sctp_association *asoc; 639 640 #ifdef SCTP_DEBUG 641 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 642 printf("sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 643 } 644 #endif 645 if (stcb == NULL) 646 return; 647 648 asoc = &stcb->asoc; 649 /* process according to association state */ 650 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 651 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 652 /* unexpected SHUTDOWN-ACK... so ignore... */ 653 SCTP_TCB_UNLOCK(stcb); 654 return; 655 } 656 if (asoc->control_pdapi) { 657 /* 658 * With a normal shutdown we assume the end of last record. 659 */ 660 SCTP_INP_READ_LOCK(stcb->sctp_ep); 661 asoc->control_pdapi->end_added = 1; 662 asoc->control_pdapi->pdapi_aborted = 1; 663 asoc->control_pdapi = NULL; 664 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 665 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 666 } 667 /* are the queues empty? */ 668 if (!TAILQ_EMPTY(&asoc->send_queue) || 669 !TAILQ_EMPTY(&asoc->sent_queue) || 670 !TAILQ_EMPTY(&asoc->out_wheel)) { 671 sctp_report_all_outbound(stcb, 0); 672 } 673 /* stop the timer */ 674 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 675 /* send SHUTDOWN-COMPLETE */ 676 sctp_send_shutdown_complete(stcb, net); 677 /* notify upper layer protocol */ 678 if (stcb->sctp_socket) { 679 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 680 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 681 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 682 /* Set the connected flag to disconnected */ 683 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 684 } 685 } 686 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 687 /* free the TCB but first save off the ep */ 688 sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 689 SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 690 } 691 692 /* 693 * Skip past the param header and then we will find the chunk that caused the 694 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 695 * our peer must be broken. 696 */ 697 static void 698 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 699 struct sctp_nets *net) 700 { 701 struct sctp_chunkhdr *chk; 702 703 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 704 switch (chk->chunk_type) { 705 case SCTP_ASCONF_ACK: 706 case SCTP_ASCONF: 707 sctp_asconf_cleanup(stcb, net); 708 break; 709 case SCTP_FORWARD_CUM_TSN: 710 stcb->asoc.peer_supports_prsctp = 0; 711 break; 712 default: 713 #ifdef SCTP_DEBUG 714 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 715 printf("Peer does not support chunk type %d(%x)??\n", 716 chk->chunk_type, (uint32_t) chk->chunk_type); 717 } 718 #endif 719 break; 720 } 721 } 722 723 /* 724 * Skip past the param header and then we will find the param that caused the 725 * problem. There are a number of param's in a ASCONF OR the prsctp param 726 * these will turn of specific features. 727 */ 728 static void 729 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 730 { 731 struct sctp_paramhdr *pbad; 732 733 pbad = phdr + 1; 734 switch (ntohs(pbad->param_type)) { 735 /* pr-sctp draft */ 736 case SCTP_PRSCTP_SUPPORTED: 737 stcb->asoc.peer_supports_prsctp = 0; 738 break; 739 case SCTP_SUPPORTED_CHUNK_EXT: 740 break; 741 /* draft-ietf-tsvwg-addip-sctp */ 742 case SCTP_ECN_NONCE_SUPPORTED: 743 stcb->asoc.peer_supports_ecn_nonce = 0; 744 stcb->asoc.ecn_nonce_allowed = 0; 745 stcb->asoc.ecn_allowed = 0; 746 break; 747 case SCTP_ADD_IP_ADDRESS: 748 case SCTP_DEL_IP_ADDRESS: 749 case SCTP_SET_PRIM_ADDR: 750 stcb->asoc.peer_supports_asconf = 0; 751 break; 752 case SCTP_SUCCESS_REPORT: 753 case SCTP_ERROR_CAUSE_IND: 754 #ifdef SCTP_DEBUG 755 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 756 printf("Huh, the peer does not support success? or error cause?\n"); 757 printf("Turning off ASCONF to this strange peer\n"); 758 } 759 #endif 760 stcb->asoc.peer_supports_asconf = 0; 761 break; 762 default: 763 #ifdef SCTP_DEBUG 764 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 765 printf("Peer does not support param type %d(%x)??\n", 766 pbad->param_type, (uint32_t) pbad->param_type); 767 } 768 #endif 769 break; 770 } 771 } 772 773 static int 774 sctp_handle_error(struct sctp_chunkhdr *ch, 775 struct sctp_tcb *stcb, struct sctp_nets *net) 776 { 777 int chklen; 778 struct sctp_paramhdr *phdr; 779 uint16_t error_type; 780 uint16_t error_len; 781 struct sctp_association *asoc; 782 783 int adjust; 784 785 /* parse through all of the errors and process */ 786 asoc = &stcb->asoc; 787 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 788 sizeof(struct sctp_chunkhdr)); 789 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 790 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 791 /* Process an Error Cause */ 792 error_type = ntohs(phdr->param_type); 793 error_len = ntohs(phdr->param_length); 794 if ((error_len > chklen) || (error_len == 0)) { 795 /* invalid param length for this param */ 796 #ifdef SCTP_DEBUG 797 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 798 printf("Bogus length in error param- chunk left:%d errorlen:%d\n", 799 chklen, error_len); 800 } 801 #endif /* SCTP_DEBUG */ 802 return (0); 803 } 804 switch (error_type) { 805 case SCTP_CAUSE_INVALID_STREAM: 806 case SCTP_CAUSE_MISSING_PARAM: 807 case SCTP_CAUSE_INVALID_PARAM: 808 case SCTP_CAUSE_NO_USER_DATA: 809 #ifdef SCTP_DEBUG 810 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 811 printf("Software error we got a %d back? We have a bug :/ (or do they?)\n", 812 error_type); 813 } 814 #endif 815 break; 816 case SCTP_CAUSE_STALE_COOKIE: 817 /* 818 * We only act if we have echoed a cookie and are 819 * waiting. 820 */ 821 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 822 int *p; 823 824 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 825 /* Save the time doubled */ 826 asoc->cookie_preserve_req = ntohl(*p) << 1; 827 asoc->stale_cookie_count++; 828 if (asoc->stale_cookie_count > 829 asoc->max_init_times) { 830 sctp_abort_notification(stcb, 0); 831 /* now free the asoc */ 832 sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 833 return (-1); 834 } 835 /* blast back to INIT state */ 836 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 837 asoc->state |= SCTP_STATE_COOKIE_WAIT; 838 839 sctp_stop_all_cookie_timers(stcb); 840 sctp_send_initiate(stcb->sctp_ep, stcb); 841 } 842 break; 843 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 844 /* 845 * Nothing we can do here, we don't do hostname 846 * addresses so if the peer does not like my IPv6 847 * (or IPv4 for that matter) it does not matter. If 848 * they don't support that type of address, they can 849 * NOT possibly get that packet type... i.e. with no 850 * IPv6 you can't recieve a IPv6 packet. so we can 851 * safely ignore this one. If we ever added support 852 * for HOSTNAME Addresses, then we would need to do 853 * something here. 854 */ 855 break; 856 case SCTP_CAUSE_UNRECOG_CHUNK: 857 sctp_process_unrecog_chunk(stcb, phdr, net); 858 break; 859 case SCTP_CAUSE_UNRECOG_PARAM: 860 sctp_process_unrecog_param(stcb, phdr); 861 break; 862 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 863 /* 864 * We ignore this since the timer will drive out a 865 * new cookie anyway and there timer will drive us 866 * to send a SHUTDOWN_COMPLETE. We can't send one 867 * here since we don't have their tag. 868 */ 869 break; 870 case SCTP_CAUSE_DELETING_LAST_ADDR: 871 case SCTP_CAUSE_RESOURCE_SHORTAGE: 872 case SCTP_CAUSE_DELETING_SRC_ADDR: 873 /* 874 * We should NOT get these here, but in a 875 * ASCONF-ACK. 876 */ 877 #ifdef SCTP_DEBUG 878 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 879 printf("Peer sends ASCONF errors in a Operational Error?<%d>?\n", 880 error_type); 881 } 882 #endif 883 break; 884 case SCTP_CAUSE_OUT_OF_RESC: 885 /* 886 * And what, pray tell do we do with the fact that 887 * the peer is out of resources? Not really sure we 888 * could do anything but abort. I suspect this 889 * should have came WITH an abort instead of in a 890 * OP-ERROR. 891 */ 892 break; 893 default: 894 #ifdef SCTP_DEBUG 895 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 896 /* don't know what this error cause is... */ 897 printf("sctp_handle_error: unknown error type = 0x%xh\n", 898 error_type); 899 } 900 #endif /* SCTP_DEBUG */ 901 break; 902 } 903 adjust = SCTP_SIZE32(error_len); 904 chklen -= adjust; 905 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 906 } 907 return (0); 908 } 909 910 static int 911 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 912 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 913 struct sctp_nets *net) 914 { 915 struct sctp_init_ack *init_ack; 916 int *state; 917 struct mbuf *op_err; 918 919 #ifdef SCTP_DEBUG 920 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 921 printf("sctp_handle_init_ack: handling INIT-ACK\n"); 922 } 923 #endif 924 if (stcb == NULL) { 925 #ifdef SCTP_DEBUG 926 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 927 printf("sctp_handle_init_ack: TCB is null\n"); 928 } 929 #endif 930 return (-1); 931 } 932 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 933 /* Invalid length */ 934 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 935 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 936 op_err); 937 return (-1); 938 } 939 init_ack = &cp->init; 940 /* validate parameters */ 941 if (init_ack->initiate_tag == 0) { 942 /* protocol error... send an abort */ 943 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 944 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 945 op_err); 946 return (-1); 947 } 948 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 949 /* protocol error... send an abort */ 950 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 951 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 952 op_err); 953 return (-1); 954 } 955 if (init_ack->num_inbound_streams == 0) { 956 /* protocol error... send an abort */ 957 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 958 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 959 op_err); 960 return (-1); 961 } 962 if (init_ack->num_outbound_streams == 0) { 963 /* protocol error... send an abort */ 964 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 965 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 966 op_err); 967 return (-1); 968 } 969 /* process according to association state... */ 970 state = &stcb->asoc.state; 971 switch (*state & SCTP_STATE_MASK) { 972 case SCTP_STATE_COOKIE_WAIT: 973 /* this is the expected state for this chunk */ 974 /* process the INIT-ACK parameters */ 975 if (stcb->asoc.primary_destination->dest_state & 976 SCTP_ADDR_UNCONFIRMED) { 977 /* 978 * The primary is where we sent the INIT, we can 979 * always consider it confirmed when the INIT-ACK is 980 * returned. Do this before we load addresses 981 * though. 982 */ 983 stcb->asoc.primary_destination->dest_state &= 984 ~SCTP_ADDR_UNCONFIRMED; 985 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 986 stcb, 0, (void *)stcb->asoc.primary_destination); 987 } 988 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, net 989 ) < 0) { 990 /* error in parsing parameters */ 991 return (-1); 992 } 993 /* update our state */ 994 #ifdef SCTP_DEBUG 995 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 996 printf("moving to COOKIE-ECHOED state\n"); 997 } 998 #endif 999 if (*state & SCTP_STATE_SHUTDOWN_PENDING) { 1000 *state = SCTP_STATE_COOKIE_ECHOED | 1001 SCTP_STATE_SHUTDOWN_PENDING; 1002 } else { 1003 *state = SCTP_STATE_COOKIE_ECHOED; 1004 } 1005 1006 /* reset the RTO calc */ 1007 stcb->asoc.overall_error_count = 0; 1008 SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1009 /* 1010 * collapse the init timer back in case of a exponential 1011 * backoff 1012 */ 1013 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1014 stcb, net); 1015 /* 1016 * the send at the end of the inbound data processing will 1017 * cause the cookie to be sent 1018 */ 1019 break; 1020 case SCTP_STATE_SHUTDOWN_SENT: 1021 /* incorrect state... discard */ 1022 break; 1023 case SCTP_STATE_COOKIE_ECHOED: 1024 /* incorrect state... discard */ 1025 break; 1026 case SCTP_STATE_OPEN: 1027 /* incorrect state... discard */ 1028 break; 1029 case SCTP_STATE_EMPTY: 1030 case SCTP_STATE_INUSE: 1031 default: 1032 /* incorrect state... discard */ 1033 return (-1); 1034 break; 1035 } /* end switch asoc state */ 1036 #ifdef SCTP_DEBUG 1037 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1038 printf("Leaving handle-init-ack end\n"); 1039 } 1040 #endif 1041 return (0); 1042 } 1043 1044 1045 /* 1046 * handle a state cookie for an existing association m: input packet mbuf 1047 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1048 * "split" mbuf and the cookie signature does not exist offset: offset into 1049 * mbuf to the cookie-echo chunk 1050 */ 1051 static struct sctp_tcb * 1052 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1053 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1054 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 1055 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id) 1056 { 1057 struct sctp_association *asoc; 1058 struct sctp_init_chunk *init_cp, init_buf; 1059 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1060 int chk_length; 1061 int init_offset, initack_offset, i; 1062 int retval; 1063 int spec_flag = 0; 1064 int how_indx; 1065 1066 /* I know that the TCB is non-NULL from the caller */ 1067 asoc = &stcb->asoc; 1068 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1069 if (asoc->cookie_how[how_indx] == 0) 1070 break; 1071 } 1072 if (how_indx < sizeof(asoc->cookie_how)) { 1073 asoc->cookie_how[how_indx] = 1; 1074 } 1075 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1076 /* SHUTDOWN came in after sending INIT-ACK */ 1077 struct mbuf *op_err; 1078 struct sctp_paramhdr *ph; 1079 1080 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1081 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1082 0, M_DONTWAIT, 1, MT_DATA); 1083 if (op_err == NULL) { 1084 /* FOOBAR */ 1085 return (NULL); 1086 } 1087 /* pre-reserve some space */ 1088 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1089 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1090 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1091 /* Set the len */ 1092 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1093 ph = mtod(op_err, struct sctp_paramhdr *); 1094 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1095 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1096 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag); 1097 if (how_indx < sizeof(asoc->cookie_how)) 1098 asoc->cookie_how[how_indx] = 2; 1099 return (NULL); 1100 } 1101 /* 1102 * find and validate the INIT chunk in the cookie (peer's info) the 1103 * INIT should start after the cookie-echo header struct (chunk 1104 * header, state cookie header struct) 1105 */ 1106 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1107 1108 init_cp = (struct sctp_init_chunk *) 1109 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1110 (uint8_t *) & init_buf); 1111 if (init_cp == NULL) { 1112 /* could not pull a INIT chunk in cookie */ 1113 return (NULL); 1114 } 1115 chk_length = ntohs(init_cp->ch.chunk_length); 1116 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1117 return (NULL); 1118 } 1119 /* 1120 * find and validate the INIT-ACK chunk in the cookie (my info) the 1121 * INIT-ACK follows the INIT chunk 1122 */ 1123 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1124 initack_cp = (struct sctp_init_ack_chunk *) 1125 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1126 (uint8_t *) & initack_buf); 1127 if (initack_cp == NULL) { 1128 /* could not pull INIT-ACK chunk in cookie */ 1129 return (NULL); 1130 } 1131 chk_length = ntohs(initack_cp->ch.chunk_length); 1132 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1133 return (NULL); 1134 } 1135 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1136 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1137 /* 1138 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1139 * to get into the OPEN state 1140 */ 1141 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1142 #ifdef INVARIANTS 1143 panic("Case D and non-match seq?"); 1144 #else 1145 printf("Case D, seq non-match %x vs %x?\n", 1146 ntohl(initack_cp->init.initial_tsn), asoc->init_seq_number); 1147 #endif 1148 } 1149 switch SCTP_GET_STATE 1150 (asoc) { 1151 case SCTP_STATE_COOKIE_WAIT: 1152 case SCTP_STATE_COOKIE_ECHOED: 1153 /* 1154 * INIT was sent, but got got a COOKIE_ECHO with the 1155 * correct tags... just accept it...but we must 1156 * process the init so that we can make sure we have 1157 * the right seq no's. 1158 */ 1159 /* First we must process the INIT !! */ 1160 retval = sctp_process_init(init_cp, stcb, net); 1161 if (retval < 0) { 1162 if (how_indx < sizeof(asoc->cookie_how)) 1163 asoc->cookie_how[how_indx] = 3; 1164 return (NULL); 1165 } 1166 /* we have already processed the INIT so no problem */ 1167 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1168 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1169 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1170 /* update current state */ 1171 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1172 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1173 else 1174 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1175 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1176 asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 1177 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1178 stcb->sctp_ep, stcb, asoc->primary_destination); 1179 1180 } else { 1181 /* if ok, move to OPEN state */ 1182 asoc->state = SCTP_STATE_OPEN; 1183 } 1184 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1185 sctp_stop_all_cookie_timers(stcb); 1186 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1187 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1188 (inp->sctp_socket->so_qlimit == 0) 1189 ) { 1190 /* 1191 * Here is where collision would go if we 1192 * did a connect() and instead got a 1193 * init/init-ack/cookie done before the 1194 * init-ack came back.. 1195 */ 1196 stcb->sctp_ep->sctp_flags |= 1197 SCTP_PCB_FLAGS_CONNECTED; 1198 soisconnected(stcb->sctp_ep->sctp_socket); 1199 } 1200 /* notify upper layer */ 1201 *notification = SCTP_NOTIFY_ASSOC_UP; 1202 /* 1203 * since we did not send a HB make sure we don't 1204 * double things 1205 */ 1206 net->hb_responded = 1; 1207 1208 if (stcb->asoc.sctp_autoclose_ticks && 1209 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1210 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1211 inp, stcb, NULL); 1212 } 1213 break; 1214 default: 1215 /* 1216 * we're in the OPEN state (or beyond), so peer must 1217 * have simply lost the COOKIE-ACK 1218 */ 1219 1220 break; 1221 } /* end switch */ 1222 sctp_stop_all_cookie_timers(stcb); 1223 /* 1224 * We ignore the return code here.. not sure if we should 1225 * somehow abort.. but we do have an existing asoc. This 1226 * really should not fail. 1227 */ 1228 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1229 init_offset + sizeof(struct sctp_init_chunk), 1230 initack_offset, sh, init_src)) { 1231 if (how_indx < sizeof(asoc->cookie_how)) 1232 asoc->cookie_how[how_indx] = 4; 1233 return (NULL); 1234 } 1235 /* respond with a COOKIE-ACK */ 1236 sctp_toss_old_cookies(stcb, asoc); 1237 sctp_send_cookie_ack(stcb); 1238 if (how_indx < sizeof(asoc->cookie_how)) 1239 asoc->cookie_how[how_indx] = 5; 1240 return (stcb); 1241 } /* end if */ 1242 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1243 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1244 cookie->tie_tag_my_vtag == 0 && 1245 cookie->tie_tag_peer_vtag == 0) { 1246 /* 1247 * case C in Section 5.2.4 Table 2: XMOO silently discard 1248 */ 1249 if (how_indx < sizeof(asoc->cookie_how)) 1250 asoc->cookie_how[how_indx] = 6; 1251 return (NULL); 1252 } 1253 if (ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag && 1254 (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag || 1255 init_cp->init.initiate_tag == 0)) { 1256 /* 1257 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1258 * should be ok, re-accept peer info 1259 */ 1260 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1261 /* 1262 * Extension of case C. If we hit this, then the 1263 * random number generator returned the same vtag 1264 * when we first sent our INIT-ACK and when we later 1265 * sent our INIT. The side with the seq numbers that 1266 * are different will be the one that normnally 1267 * would have hit case C. This in effect "extends" 1268 * our vtags in this collision case to be 64 bits. 1269 * The same collision could occur aka you get both 1270 * vtag and seq number the same twice in a row.. but 1271 * is much less likely. If it did happen then we 1272 * would proceed through and bring up the assoc.. we 1273 * may end up with the wrong stream setup however.. 1274 * which would be bad.. but there is no way to 1275 * tell.. until we send on a stream that does not 1276 * exist :-) 1277 */ 1278 if (how_indx < sizeof(asoc->cookie_how)) 1279 asoc->cookie_how[how_indx] = 7; 1280 1281 return (NULL); 1282 } 1283 if (how_indx < sizeof(asoc->cookie_how)) 1284 asoc->cookie_how[how_indx] = 8; 1285 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1286 sctp_stop_all_cookie_timers(stcb); 1287 /* 1288 * since we did not send a HB make sure we don't double 1289 * things 1290 */ 1291 net->hb_responded = 1; 1292 if (stcb->asoc.sctp_autoclose_ticks && 1293 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1294 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1295 NULL); 1296 } 1297 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1298 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1299 1300 /* Note last_cwr_tsn? where is this used? */ 1301 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1302 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1303 /* 1304 * Ok the peer probably discarded our data (if we 1305 * echoed a cookie+data). So anything on the 1306 * sent_queue should be marked for retransmit, we 1307 * may not get something to kick us so it COULD 1308 * still take a timeout to move these.. but it can't 1309 * hurt to mark them. 1310 */ 1311 struct sctp_tmit_chunk *chk; 1312 1313 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1314 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1315 chk->sent = SCTP_DATAGRAM_RESEND; 1316 stcb->asoc.sent_queue_retran_cnt++; 1317 spec_flag++; 1318 } 1319 } 1320 1321 } 1322 /* process the INIT info (peer's info) */ 1323 retval = sctp_process_init(init_cp, stcb, net); 1324 if (retval < 0) { 1325 if (how_indx < sizeof(asoc->cookie_how)) 1326 asoc->cookie_how[how_indx] = 9; 1327 return (NULL); 1328 } 1329 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1330 init_offset + sizeof(struct sctp_init_chunk), 1331 initack_offset, sh, init_src)) { 1332 if (how_indx < sizeof(asoc->cookie_how)) 1333 asoc->cookie_how[how_indx] = 10; 1334 return (NULL); 1335 } 1336 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1337 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1338 *notification = SCTP_NOTIFY_ASSOC_UP; 1339 1340 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1341 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1342 (inp->sctp_socket->so_qlimit == 0)) { 1343 stcb->sctp_ep->sctp_flags |= 1344 SCTP_PCB_FLAGS_CONNECTED; 1345 soisconnected(stcb->sctp_ep->sctp_socket); 1346 } 1347 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1348 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1349 else 1350 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1351 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1352 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1353 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1354 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1355 } else { 1356 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1357 } 1358 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1359 asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 1360 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1361 stcb->sctp_ep, stcb, asoc->primary_destination); 1362 1363 } else { 1364 asoc->state = SCTP_STATE_OPEN; 1365 } 1366 sctp_stop_all_cookie_timers(stcb); 1367 sctp_toss_old_cookies(stcb, asoc); 1368 sctp_send_cookie_ack(stcb); 1369 if (spec_flag) { 1370 /* 1371 * only if we have retrans set do we do this. What 1372 * this call does is get only the COOKIE-ACK out and 1373 * then when we return the normal call to 1374 * sctp_chunk_output will get the retrans out behind 1375 * this. 1376 */ 1377 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK); 1378 } 1379 if (how_indx < sizeof(asoc->cookie_how)) 1380 asoc->cookie_how[how_indx] = 11; 1381 1382 return (stcb); 1383 } 1384 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1385 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1386 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1387 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1388 cookie->tie_tag_peer_vtag != 0) { 1389 struct sctpasochead *head; 1390 1391 /* 1392 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1393 */ 1394 /* temp code */ 1395 if (how_indx < sizeof(asoc->cookie_how)) 1396 asoc->cookie_how[how_indx] = 12; 1397 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1398 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1399 1400 *sac_assoc_id = sctp_get_associd(stcb); 1401 /* notify upper layer */ 1402 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1403 atomic_add_int(&stcb->asoc.refcnt, 1); 1404 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1405 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1406 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1407 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1408 } 1409 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1410 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1411 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1412 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1413 } 1414 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1415 asoc->state = SCTP_STATE_OPEN | 1416 SCTP_STATE_SHUTDOWN_PENDING; 1417 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1418 stcb->sctp_ep, stcb, asoc->primary_destination); 1419 1420 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1421 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1422 asoc->state = SCTP_STATE_OPEN; 1423 } 1424 asoc->pre_open_streams = 1425 ntohs(initack_cp->init.num_outbound_streams); 1426 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1427 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1428 1429 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1430 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1431 1432 asoc->str_reset_seq_in = asoc->init_seq_number; 1433 1434 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1435 if (asoc->mapping_array) 1436 memset(asoc->mapping_array, 0, 1437 asoc->mapping_array_size); 1438 SCTP_TCB_UNLOCK(stcb); 1439 SCTP_INP_INFO_WLOCK(); 1440 SCTP_INP_WLOCK(stcb->sctp_ep); 1441 SCTP_TCB_LOCK(stcb); 1442 atomic_add_int(&stcb->asoc.refcnt, -1); 1443 /* send up all the data */ 1444 SCTP_TCB_SEND_LOCK(stcb); 1445 1446 sctp_report_all_outbound(stcb, 1); 1447 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1448 stcb->asoc.strmout[i].stream_no = i; 1449 stcb->asoc.strmout[i].next_sequence_sent = 0; 1450 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1451 } 1452 /* process the INIT-ACK info (my info) */ 1453 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1454 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1455 1456 /* pull from vtag hash */ 1457 LIST_REMOVE(stcb, sctp_asocs); 1458 /* re-insert to new vtag position */ 1459 head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1460 sctppcbinfo.hashasocmark)]; 1461 /* 1462 * put it in the bucket in the vtag hash of assoc's for the 1463 * system 1464 */ 1465 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1466 1467 /* Is this the first restart? */ 1468 if (stcb->asoc.in_restart_hash == 0) { 1469 /* Ok add it to assoc_id vtag hash */ 1470 head = &sctppcbinfo.sctp_restarthash[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id, 1471 sctppcbinfo.hashrestartmark)]; 1472 LIST_INSERT_HEAD(head, stcb, sctp_tcbrestarhash); 1473 stcb->asoc.in_restart_hash = 1; 1474 } 1475 /* process the INIT info (peer's info) */ 1476 SCTP_TCB_SEND_UNLOCK(stcb); 1477 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1478 SCTP_INP_INFO_WUNLOCK(); 1479 1480 retval = sctp_process_init(init_cp, stcb, net); 1481 if (retval < 0) { 1482 if (how_indx < sizeof(asoc->cookie_how)) 1483 asoc->cookie_how[how_indx] = 13; 1484 1485 return (NULL); 1486 } 1487 /* 1488 * since we did not send a HB make sure we don't double 1489 * things 1490 */ 1491 net->hb_responded = 1; 1492 1493 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1494 init_offset + sizeof(struct sctp_init_chunk), 1495 initack_offset, sh, init_src)) { 1496 if (how_indx < sizeof(asoc->cookie_how)) 1497 asoc->cookie_how[how_indx] = 14; 1498 1499 return (NULL); 1500 } 1501 /* respond with a COOKIE-ACK */ 1502 sctp_stop_all_cookie_timers(stcb); 1503 sctp_toss_old_cookies(stcb, asoc); 1504 sctp_send_cookie_ack(stcb); 1505 if (how_indx < sizeof(asoc->cookie_how)) 1506 asoc->cookie_how[how_indx] = 15; 1507 1508 return (stcb); 1509 } 1510 if (how_indx < sizeof(asoc->cookie_how)) 1511 asoc->cookie_how[how_indx] = 16; 1512 /* all other cases... */ 1513 return (NULL); 1514 } 1515 1516 1517 /* 1518 * handle a state cookie for a new association m: input packet mbuf chain-- 1519 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1520 * and the cookie signature does not exist offset: offset into mbuf to the 1521 * cookie-echo chunk length: length of the cookie chunk to: where the init 1522 * was from returns a new TCB 1523 */ 1524 static struct sctp_tcb * 1525 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1526 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1527 struct sctp_inpcb *inp, struct sctp_nets **netp, 1528 struct sockaddr *init_src, int *notification, 1529 int auth_skipped, uint32_t auth_offset, uint32_t auth_len) 1530 { 1531 struct sctp_tcb *stcb; 1532 struct sctp_init_chunk *init_cp, init_buf; 1533 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1534 struct sockaddr_storage sa_store; 1535 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1536 struct sockaddr_in *sin; 1537 struct sockaddr_in6 *sin6; 1538 struct sctp_association *asoc; 1539 uint32_t vrf; 1540 int chk_length; 1541 int init_offset, initack_offset, initack_limit; 1542 int retval; 1543 int error = 0; 1544 uint32_t old_tag; 1545 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1546 1547 vrf = SCTP_DEFAULT_VRFID; 1548 1549 /* 1550 * find and validate the INIT chunk in the cookie (peer's info) the 1551 * INIT should start after the cookie-echo header struct (chunk 1552 * header, state cookie header struct) 1553 */ 1554 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1555 init_cp = (struct sctp_init_chunk *) 1556 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1557 (uint8_t *) & init_buf); 1558 if (init_cp == NULL) { 1559 /* could not pull a INIT chunk in cookie */ 1560 #ifdef SCTP_DEBUG 1561 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1562 printf("process_cookie_new: could not pull INIT chunk hdr\n"); 1563 } 1564 #endif /* SCTP_DEBUG */ 1565 return (NULL); 1566 } 1567 chk_length = ntohs(init_cp->ch.chunk_length); 1568 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1569 #ifdef SCTP_DEBUG 1570 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1571 printf("HUH? process_cookie_new: could not find INIT chunk!\n"); 1572 } 1573 #endif /* SCTP_DEBUG */ 1574 return (NULL); 1575 } 1576 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1577 /* 1578 * find and validate the INIT-ACK chunk in the cookie (my info) the 1579 * INIT-ACK follows the INIT chunk 1580 */ 1581 initack_cp = (struct sctp_init_ack_chunk *) 1582 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1583 (uint8_t *) & initack_buf); 1584 if (initack_cp == NULL) { 1585 /* could not pull INIT-ACK chunk in cookie */ 1586 #ifdef SCTP_DEBUG 1587 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1588 printf("process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1589 } 1590 #endif /* SCTP_DEBUG */ 1591 return (NULL); 1592 } 1593 chk_length = ntohs(initack_cp->ch.chunk_length); 1594 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1595 return (NULL); 1596 } 1597 /* 1598 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1599 * "initack_limit" value. This is because the chk_length field 1600 * includes the length of the cookie, but the cookie is omitted when 1601 * the INIT and INIT_ACK are tacked onto the cookie... 1602 */ 1603 initack_limit = offset + cookie_len; 1604 1605 /* 1606 * now that we know the INIT/INIT-ACK are in place, create a new TCB 1607 * and popluate 1608 */ 1609 stcb = sctp_aloc_assoc(inp, init_src, 0, &error, 1610 ntohl(initack_cp->init.initiate_tag), vrf); 1611 if (stcb == NULL) { 1612 struct mbuf *op_err; 1613 1614 /* memory problem? */ 1615 #ifdef SCTP_DEBUG 1616 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1617 printf("process_cookie_new: no room for another TCB!\n"); 1618 } 1619 #endif /* SCTP_DEBUG */ 1620 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1621 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 1622 sh, op_err); 1623 return (NULL); 1624 } 1625 /* get the correct sctp_nets */ 1626 *netp = sctp_findnet(stcb, init_src); 1627 asoc = &stcb->asoc; 1628 /* get scope variables out of cookie */ 1629 asoc->ipv4_local_scope = cookie->ipv4_scope; 1630 asoc->site_scope = cookie->site_scope; 1631 asoc->local_scope = cookie->local_scope; 1632 asoc->loopback_scope = cookie->loopback_scope; 1633 1634 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 1635 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 1636 struct mbuf *op_err; 1637 1638 /* 1639 * Houston we have a problem. The EP changed while the 1640 * cookie was in flight. Only recourse is to abort the 1641 * association. 1642 */ 1643 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1644 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 1645 sh, op_err); 1646 return (NULL); 1647 } 1648 /* process the INIT-ACK info (my info) */ 1649 old_tag = asoc->my_vtag; 1650 asoc->assoc_id = asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1651 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1652 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1653 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1654 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1655 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1656 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1657 asoc->str_reset_seq_in = asoc->init_seq_number; 1658 1659 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1660 1661 /* process the INIT info (peer's info) */ 1662 retval = sctp_process_init(init_cp, stcb, *netp); 1663 if (retval < 0) { 1664 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1665 return (NULL); 1666 } 1667 /* load all addresses */ 1668 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1669 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 1670 init_src)) { 1671 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1672 return (NULL); 1673 } 1674 /* 1675 * verify any preceding AUTH chunk that was skipped 1676 */ 1677 /* pull the local authentication parameters from the cookie/init-ack */ 1678 sctp_auth_get_cookie_params(stcb, m, 1679 initack_offset + sizeof(struct sctp_init_ack_chunk), 1680 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 1681 if (auth_skipped) { 1682 struct sctp_auth_chunk *auth; 1683 1684 auth = (struct sctp_auth_chunk *) 1685 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 1686 if (sctp_handle_auth(stcb, auth, m, auth_offset)) { 1687 /* auth HMAC failed, dump the assoc and packet */ 1688 #ifdef SCTP_DEBUG 1689 if (sctp_debug_on & SCTP_DEBUG_AUTH1) 1690 printf("COOKIE-ECHO: AUTH failed\n"); 1691 #endif /* SCTP_DEBUG */ 1692 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 1693 return (NULL); 1694 } else { 1695 /* remaining chunks checked... good to go */ 1696 stcb->asoc.authenticated = 1; 1697 } 1698 } 1699 /* update current state */ 1700 #ifdef SCTP_DEBUG 1701 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1702 printf("moving to OPEN state\n"); 1703 } 1704 #endif 1705 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1706 asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 1707 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1708 stcb->sctp_ep, stcb, asoc->primary_destination); 1709 } else { 1710 asoc->state = SCTP_STATE_OPEN; 1711 } 1712 sctp_stop_all_cookie_timers(stcb); 1713 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 1714 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1715 1716 /* 1717 * if we're doing ASCONFs, check to see if we have any new local 1718 * addresses that need to get added to the peer (eg. addresses 1719 * changed while cookie echo in flight). This needs to be done 1720 * after we go to the OPEN state to do the correct asconf 1721 * processing. else, make sure we have the correct addresses in our 1722 * lists 1723 */ 1724 1725 /* warning, we re-use sin, sin6, sa_store here! */ 1726 /* pull in local_address (our "from" address) */ 1727 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 1728 /* source addr is IPv4 */ 1729 sin = (struct sockaddr_in *)initack_src; 1730 memset(sin, 0, sizeof(*sin)); 1731 sin->sin_family = AF_INET; 1732 sin->sin_len = sizeof(struct sockaddr_in); 1733 sin->sin_addr.s_addr = cookie->laddress[0]; 1734 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 1735 /* source addr is IPv6 */ 1736 sin6 = (struct sockaddr_in6 *)initack_src; 1737 memset(sin6, 0, sizeof(*sin6)); 1738 sin6->sin6_family = AF_INET6; 1739 sin6->sin6_len = sizeof(struct sockaddr_in6); 1740 sin6->sin6_scope_id = cookie->scope_id; 1741 memcpy(&sin6->sin6_addr, cookie->laddress, 1742 sizeof(sin6->sin6_addr)); 1743 } else { 1744 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 1745 return (NULL); 1746 } 1747 1748 sctp_check_address_list(stcb, m, 1749 initack_offset + sizeof(struct sctp_init_ack_chunk), 1750 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 1751 initack_src, cookie->local_scope, cookie->site_scope, 1752 cookie->ipv4_scope, cookie->loopback_scope); 1753 1754 1755 /* set up to notify upper layer */ 1756 *notification = SCTP_NOTIFY_ASSOC_UP; 1757 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1758 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1759 (inp->sctp_socket->so_qlimit == 0)) { 1760 /* 1761 * This is an endpoint that called connect() how it got a 1762 * cookie that is NEW is a bit of a mystery. It must be that 1763 * the INIT was sent, but before it got there.. a complete 1764 * INIT/INIT-ACK/COOKIE arrived. But of course then it 1765 * should have went to the other code.. not here.. oh well.. 1766 * a bit of protection is worth having.. 1767 */ 1768 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1769 soisconnected(stcb->sctp_ep->sctp_socket); 1770 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1771 (inp->sctp_socket->so_qlimit)) { 1772 /* 1773 * We don't want to do anything with this one. Since it is 1774 * the listening guy. The timer will get started for 1775 * accepted connections in the caller. 1776 */ 1777 ; 1778 } 1779 /* since we did not send a HB make sure we don't double things */ 1780 (*netp)->hb_responded = 1; 1781 1782 if (stcb->asoc.sctp_autoclose_ticks && 1783 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1784 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1785 } 1786 /* respond with a COOKIE-ACK */ 1787 /* calculate the RTT */ 1788 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 1789 &cookie->time_entered); 1790 sctp_send_cookie_ack(stcb); 1791 return (stcb); 1792 } 1793 1794 1795 /* 1796 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 1797 * existing (non-NULL) TCB 1798 */ 1799 static struct mbuf * 1800 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 1801 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 1802 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 1803 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, struct sctp_tcb **locked_tcb) 1804 { 1805 struct sctp_state_cookie *cookie; 1806 struct sockaddr_in6 sin6; 1807 struct sockaddr_in sin; 1808 struct sctp_tcb *l_stcb = *stcb; 1809 struct sctp_inpcb *l_inp; 1810 struct sockaddr *to; 1811 sctp_assoc_t sac_restart_id; 1812 struct sctp_pcb *ep; 1813 struct mbuf *m_sig; 1814 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 1815 uint8_t *sig; 1816 uint8_t cookie_ok = 0; 1817 unsigned int size_of_pkt, sig_offset, cookie_offset; 1818 unsigned int cookie_len; 1819 struct timeval now; 1820 struct timeval time_expires; 1821 struct sockaddr_storage dest_store; 1822 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 1823 struct ip *iph; 1824 int notification = 0; 1825 struct sctp_nets *netl; 1826 int had_a_existing_tcb = 0; 1827 1828 #ifdef SCTP_DEBUG 1829 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 1830 printf("sctp_handle_cookie: handling COOKIE-ECHO\n"); 1831 } 1832 #endif 1833 1834 if (inp_p == NULL) { 1835 return (NULL); 1836 } 1837 /* First get the destination address setup too. */ 1838 iph = mtod(m, struct ip *); 1839 if (iph->ip_v == IPVERSION) { 1840 /* its IPv4 */ 1841 struct sockaddr_in *sin; 1842 1843 sin = (struct sockaddr_in *)(localep_sa); 1844 memset(sin, 0, sizeof(*sin)); 1845 sin->sin_family = AF_INET; 1846 sin->sin_len = sizeof(*sin); 1847 sin->sin_port = sh->dest_port; 1848 sin->sin_addr.s_addr = iph->ip_dst.s_addr; 1849 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 1850 } else if (iph->ip_v == (IPV6_VERSION >> 4)) { 1851 /* its IPv6 */ 1852 struct ip6_hdr *ip6; 1853 struct sockaddr_in6 *sin6; 1854 1855 sin6 = (struct sockaddr_in6 *)(localep_sa); 1856 memset(sin6, 0, sizeof(*sin6)); 1857 sin6->sin6_family = AF_INET6; 1858 sin6->sin6_len = sizeof(struct sockaddr_in6); 1859 ip6 = mtod(m, struct ip6_hdr *); 1860 sin6->sin6_port = sh->dest_port; 1861 sin6->sin6_addr = ip6->ip6_dst; 1862 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 1863 } else { 1864 return (NULL); 1865 } 1866 1867 cookie = &cp->cookie; 1868 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 1869 cookie_len = ntohs(cp->ch.chunk_length); 1870 1871 if ((cookie->peerport != sh->src_port) && 1872 (cookie->myport != sh->dest_port) && 1873 (cookie->my_vtag != sh->v_tag)) { 1874 /* 1875 * invalid ports or bad tag. Note that we always leave the 1876 * v_tag in the header in network order and when we stored 1877 * it in the my_vtag slot we also left it in network order. 1878 * This maintians the match even though it may be in the 1879 * opposite byte order of the machine :-> 1880 */ 1881 return (NULL); 1882 } 1883 if (cookie_len > size_of_pkt || 1884 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 1885 sizeof(struct sctp_init_chunk) + 1886 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 1887 /* cookie too long! or too small */ 1888 return (NULL); 1889 } 1890 /* 1891 * split off the signature into its own mbuf (since it should not be 1892 * calculated in the sctp_hmac_m() call). 1893 */ 1894 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 1895 if (sig_offset > size_of_pkt) { 1896 /* packet not correct size! */ 1897 /* XXX this may already be accounted for earlier... */ 1898 return (NULL); 1899 } 1900 m_sig = m_split(m, sig_offset, M_DONTWAIT); 1901 if (m_sig == NULL) { 1902 /* out of memory or ?? */ 1903 return (NULL); 1904 } 1905 /* 1906 * compute the signature/digest for the cookie 1907 */ 1908 ep = &(*inp_p)->sctp_ep; 1909 l_inp = *inp_p; 1910 if (l_stcb) { 1911 SCTP_TCB_UNLOCK(l_stcb); 1912 } 1913 SCTP_INP_RLOCK(l_inp); 1914 if (l_stcb) { 1915 SCTP_TCB_LOCK(l_stcb); 1916 } 1917 /* which cookie is it? */ 1918 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 1919 (ep->current_secret_number != ep->last_secret_number)) { 1920 /* it's the old cookie */ 1921 sctp_hmac_m(SCTP_HMAC, 1922 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 1923 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1924 } else { 1925 /* it's the current cookie */ 1926 sctp_hmac_m(SCTP_HMAC, 1927 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 1928 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1929 } 1930 /* get the signature */ 1931 SCTP_INP_RUNLOCK(l_inp); 1932 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 1933 if (sig == NULL) { 1934 /* couldn't find signature */ 1935 sctp_m_freem(m_sig); 1936 return (NULL); 1937 } 1938 /* compare the received digest with the computed digest */ 1939 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 1940 /* try the old cookie? */ 1941 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 1942 (ep->current_secret_number != ep->last_secret_number)) { 1943 /* compute digest with old */ 1944 sctp_hmac_m(SCTP_HMAC, 1945 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 1946 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1947 /* compare */ 1948 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 1949 cookie_ok = 1; 1950 } 1951 } else { 1952 cookie_ok = 1; 1953 } 1954 1955 /* 1956 * Now before we continue we must reconstruct our mbuf so that 1957 * normal processing of any other chunks will work. 1958 */ 1959 { 1960 struct mbuf *m_at; 1961 1962 m_at = m; 1963 while (SCTP_BUF_NEXT(m_at) != NULL) { 1964 m_at = SCTP_BUF_NEXT(m_at); 1965 } 1966 SCTP_BUF_NEXT(m_at) = m_sig; 1967 } 1968 1969 if (cookie_ok == 0) { 1970 #ifdef SCTP_DEBUG 1971 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 1972 printf("handle_cookie_echo: cookie signature validation failed!\n"); 1973 printf("offset = %u, cookie_offset = %u, sig_offset = %u\n", 1974 (uint32_t) offset, cookie_offset, sig_offset); 1975 } 1976 #endif 1977 return (NULL); 1978 } 1979 /* 1980 * check the cookie timestamps to be sure it's not stale 1981 */ 1982 SCTP_GETTIME_TIMEVAL(&now); 1983 /* Expire time is in Ticks, so we convert to seconds */ 1984 time_expires.tv_sec = cookie->time_entered.tv_sec + cookie->cookie_life; 1985 time_expires.tv_usec = cookie->time_entered.tv_usec; 1986 if (timevalcmp(&now, &time_expires, >)) { 1987 /* cookie is stale! */ 1988 struct mbuf *op_err; 1989 struct sctp_stale_cookie_msg *scm; 1990 uint32_t tim; 1991 1992 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 1993 0, M_DONTWAIT, 1, MT_DATA); 1994 if (op_err == NULL) { 1995 /* FOOBAR */ 1996 return (NULL); 1997 } 1998 /* pre-reserve some space */ 1999 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 2000 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 2001 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 2002 2003 /* Set the len */ 2004 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2005 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2006 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2007 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2008 (sizeof(uint32_t)))); 2009 /* seconds to usec */ 2010 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2011 /* add in usec */ 2012 if (tim == 0) 2013 tim = now.tv_usec - cookie->time_entered.tv_usec; 2014 scm->time_usec = htonl(tim); 2015 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag); 2016 return (NULL); 2017 } 2018 /* 2019 * Now we must see with the lookup address if we have an existing 2020 * asoc. This will only happen if we were in the COOKIE-WAIT state 2021 * and a INIT collided with us and somewhere the peer sent the 2022 * cookie on another address besides the single address our assoc 2023 * had for him. In this case we will have one of the tie-tags set at 2024 * least AND the address field in the cookie can be used to look it 2025 * up. 2026 */ 2027 to = NULL; 2028 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2029 memset(&sin6, 0, sizeof(sin6)); 2030 sin6.sin6_family = AF_INET6; 2031 sin6.sin6_len = sizeof(sin6); 2032 sin6.sin6_port = sh->src_port; 2033 sin6.sin6_scope_id = cookie->scope_id; 2034 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2035 sizeof(sin6.sin6_addr.s6_addr)); 2036 to = (struct sockaddr *)&sin6; 2037 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2038 memset(&sin, 0, sizeof(sin)); 2039 sin.sin_family = AF_INET; 2040 sin.sin_len = sizeof(sin); 2041 sin.sin_port = sh->src_port; 2042 sin.sin_addr.s_addr = cookie->address[0]; 2043 to = (struct sockaddr *)&sin; 2044 } 2045 if ((*stcb == NULL) && to) { 2046 /* Yep, lets check */ 2047 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2048 if (*stcb == NULL) { 2049 /* 2050 * We should have only got back the same inp. If we 2051 * got back a different ep we have a problem. The 2052 * original findep got back l_inp and now 2053 */ 2054 if (l_inp != *inp_p) { 2055 printf("Bad problem find_ep got a diff inp then special_locate?\n"); 2056 } 2057 } else { 2058 if (*locked_tcb == NULL) { 2059 /* 2060 * In this case we found the assoc only 2061 * after we locked the create lock. This 2062 * means we are in a colliding case and we 2063 * must make sure that we unlock the tcb if 2064 * its one of the cases where we throw away 2065 * the incoming packets. 2066 */ 2067 *locked_tcb = *stcb; 2068 2069 /* 2070 * We must also increment the inp ref count 2071 * since the ref_count flags was set when we 2072 * did not find the TCB, now we found it 2073 * which reduces the refcount.. we must 2074 * raise it back out to balance it all :-) 2075 */ 2076 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2077 if ((*stcb)->sctp_ep != l_inp) { 2078 printf("Huh? ep:%p diff then l_inp:%p?\n", 2079 (*stcb)->sctp_ep, l_inp); 2080 } 2081 } 2082 } 2083 } 2084 cookie_len -= SCTP_SIGNATURE_SIZE; 2085 if (*stcb == NULL) { 2086 /* this is the "normal" case... get a new TCB */ 2087 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2088 cookie_len, *inp_p, netp, to, ¬ification, 2089 auth_skipped, auth_offset, auth_len); 2090 } else { 2091 /* this is abnormal... cookie-echo on existing TCB */ 2092 had_a_existing_tcb = 1; 2093 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2094 cookie, cookie_len, *inp_p, *stcb, *netp, to, ¬ification, 2095 &sac_restart_id); 2096 } 2097 2098 if (*stcb == NULL) { 2099 /* still no TCB... must be bad cookie-echo */ 2100 return (NULL); 2101 } 2102 /* 2103 * Ok, we built an association so confirm the address we sent the 2104 * INIT-ACK to. 2105 */ 2106 netl = sctp_findnet(*stcb, to); 2107 /* 2108 * This code should in theory NOT run but 2109 */ 2110 if (netl == NULL) { 2111 /* TSNH! Huh, why do I need to add this address here? */ 2112 int ret; 2113 2114 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2115 SCTP_IN_COOKIE_PROC); 2116 netl = sctp_findnet(*stcb, to); 2117 } 2118 if (netl) { 2119 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2120 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2121 sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2122 netl); 2123 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2124 (*stcb), 0, (void *)netl); 2125 } 2126 } 2127 if (*stcb) { 2128 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2129 *stcb, NULL); 2130 } 2131 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2132 if (!had_a_existing_tcb || 2133 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2134 /* 2135 * If we have a NEW cookie or the connect never 2136 * reached the connected state during collision we 2137 * must do the TCP accept thing. 2138 */ 2139 struct socket *so, *oso; 2140 struct sctp_inpcb *inp; 2141 2142 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2143 /* 2144 * For a restart we will keep the same 2145 * socket, no need to do anything. I THINK!! 2146 */ 2147 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id); 2148 return (m); 2149 } 2150 oso = (*inp_p)->sctp_socket; 2151 /* 2152 * We do this to keep the sockets side happy durin 2153 * the sonewcon ONLY. 2154 */ 2155 NET_LOCK_GIANT(); 2156 SCTP_TCB_UNLOCK((*stcb)); 2157 so = sonewconn(oso, 0 2158 ); 2159 NET_UNLOCK_GIANT(); 2160 SCTP_INP_WLOCK((*stcb)->sctp_ep); 2161 SCTP_TCB_LOCK((*stcb)); 2162 SCTP_INP_WUNLOCK((*stcb)->sctp_ep); 2163 if (so == NULL) { 2164 struct mbuf *op_err; 2165 2166 /* Too many sockets */ 2167 #ifdef SCTP_DEBUG 2168 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 2169 printf("process_cookie_new: no room for another socket!\n"); 2170 } 2171 #endif /* SCTP_DEBUG */ 2172 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2173 sctp_abort_association(*inp_p, NULL, m, iphlen, 2174 sh, op_err); 2175 sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2176 return (NULL); 2177 } 2178 inp = (struct sctp_inpcb *)so->so_pcb; 2179 SCTP_INP_INCR_REF(inp); 2180 /* 2181 * We add the unbound flag here so that if we get an 2182 * soabort() before we get the move_pcb done, we 2183 * will properly cleanup. 2184 */ 2185 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2186 SCTP_PCB_FLAGS_CONNECTED | 2187 SCTP_PCB_FLAGS_IN_TCPPOOL | 2188 SCTP_PCB_FLAGS_UNBOUND | 2189 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2190 SCTP_PCB_FLAGS_DONT_WAKE); 2191 inp->sctp_features = (*inp_p)->sctp_features; 2192 inp->sctp_socket = so; 2193 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2194 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2195 inp->sctp_context = (*inp_p)->sctp_context; 2196 inp->inp_starting_point_for_iterator = NULL; 2197 /* 2198 * copy in the authentication parameters from the 2199 * original endpoint 2200 */ 2201 if (inp->sctp_ep.local_hmacs) 2202 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2203 inp->sctp_ep.local_hmacs = 2204 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2205 if (inp->sctp_ep.local_auth_chunks) 2206 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2207 inp->sctp_ep.local_auth_chunks = 2208 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2209 (void)sctp_copy_skeylist(&(*inp_p)->sctp_ep.shared_keys, 2210 &inp->sctp_ep.shared_keys); 2211 2212 /* 2213 * Now we must move it from one hash table to 2214 * another and get the tcb in the right place. 2215 */ 2216 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2217 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb); 2218 2219 /* 2220 * now we must check to see if we were aborted while 2221 * the move was going on and the lock/unlock 2222 * happened. 2223 */ 2224 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2225 /* 2226 * yep it was, we leave the assoc attached 2227 * to the socket since the sctp_inpcb_free() 2228 * call will send an abort for us. 2229 */ 2230 SCTP_INP_DECR_REF(inp); 2231 return (NULL); 2232 } 2233 SCTP_INP_DECR_REF(inp); 2234 /* Switch over to the new guy */ 2235 *inp_p = inp; 2236 sctp_ulp_notify(notification, *stcb, 0, NULL); 2237 2238 /* 2239 * Pull it from the incomplete queue and wake the 2240 * guy 2241 */ 2242 soisconnected(so); 2243 return (m); 2244 } 2245 } 2246 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2247 sctp_ulp_notify(notification, *stcb, 0, NULL); 2248 } 2249 return (m); 2250 } 2251 2252 static void 2253 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2254 struct sctp_tcb *stcb, struct sctp_nets *net) 2255 { 2256 /* cp must not be used, others call this without a c-ack :-) */ 2257 struct sctp_association *asoc; 2258 2259 #ifdef SCTP_DEBUG 2260 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2261 printf("sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2262 } 2263 #endif 2264 if (stcb == NULL) 2265 return; 2266 2267 asoc = &stcb->asoc; 2268 2269 sctp_stop_all_cookie_timers(stcb); 2270 /* process according to association state */ 2271 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2272 /* state change only needed when I am in right state */ 2273 #ifdef SCTP_DEBUG 2274 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2275 printf("moving to OPEN state\n"); 2276 } 2277 #endif 2278 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2279 asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 2280 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2281 stcb->sctp_ep, stcb, asoc->primary_destination); 2282 2283 } else { 2284 asoc->state = SCTP_STATE_OPEN; 2285 } 2286 /* update RTO */ 2287 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2288 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2289 if (asoc->overall_error_count == 0) { 2290 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2291 &asoc->time_entered); 2292 } 2293 SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2294 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL); 2295 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2296 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2297 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2298 soisconnected(stcb->sctp_ep->sctp_socket); 2299 } 2300 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2301 stcb, net); 2302 /* 2303 * since we did not send a HB make sure we don't double 2304 * things 2305 */ 2306 net->hb_responded = 1; 2307 2308 if (stcb->asoc.sctp_autoclose_ticks && 2309 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2310 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2311 stcb->sctp_ep, stcb, NULL); 2312 } 2313 /* 2314 * set ASCONF timer if ASCONFs are pending and allowed (eg. 2315 * addresses changed when init/cookie echo in flight) 2316 */ 2317 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2318 (stcb->asoc.peer_supports_asconf) && 2319 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2320 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2321 stcb->sctp_ep, stcb, 2322 stcb->asoc.primary_destination); 2323 } 2324 } 2325 /* Toss the cookie if I can */ 2326 sctp_toss_old_cookies(stcb, asoc); 2327 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2328 /* Restart the timer if we have pending data */ 2329 struct sctp_tmit_chunk *chk; 2330 2331 chk = TAILQ_FIRST(&asoc->sent_queue); 2332 if (chk) { 2333 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2334 stcb, chk->whoTo); 2335 } 2336 } 2337 } 2338 2339 static void 2340 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2341 struct sctp_tcb *stcb) 2342 { 2343 struct sctp_nets *net; 2344 struct sctp_tmit_chunk *lchk; 2345 uint32_t tsn; 2346 2347 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2348 return; 2349 } 2350 SCTP_STAT_INCR(sctps_recvecne); 2351 tsn = ntohl(cp->tsn); 2352 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2353 /* Also we make sure we disable the nonce_wait */ 2354 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2355 if (lchk == NULL) { 2356 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2357 } else { 2358 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2359 } 2360 stcb->asoc.nonce_wait_for_ecne = 0; 2361 stcb->asoc.nonce_sum_check = 0; 2362 2363 /* Find where it was sent, if possible */ 2364 net = NULL; 2365 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2366 while (lchk) { 2367 if (lchk->rec.data.TSN_seq == tsn) { 2368 net = lchk->whoTo; 2369 break; 2370 } 2371 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2372 break; 2373 lchk = TAILQ_NEXT(lchk, sctp_next); 2374 } 2375 if (net == NULL) 2376 /* default is we use the primary */ 2377 net = stcb->asoc.primary_destination; 2378 2379 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2380 #ifdef SCTP_CWND_MONITOR 2381 int old_cwnd; 2382 2383 old_cwnd = net->cwnd; 2384 #endif 2385 SCTP_STAT_INCR(sctps_ecnereducedcwnd); 2386 net->ssthresh = net->cwnd / 2; 2387 if (net->ssthresh < net->mtu) { 2388 net->ssthresh = net->mtu; 2389 /* here back off the timer as well, to slow us down */ 2390 net->RTO <<= 2; 2391 } 2392 net->cwnd = net->ssthresh; 2393 #ifdef SCTP_CWND_MONITOR 2394 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 2395 #endif 2396 /* 2397 * we reduce once every RTT. So we will only lower cwnd at 2398 * the next sending seq i.e. the resync_tsn. 2399 */ 2400 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2401 } 2402 /* 2403 * We always send a CWR this way if our previous one was lost our 2404 * peer will get an update, or if it is not time again to reduce we 2405 * still get the cwr to the peer. 2406 */ 2407 sctp_send_cwr(stcb, net, tsn); 2408 } 2409 2410 static void 2411 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2412 { 2413 /* 2414 * Here we get a CWR from the peer. We must look in the outqueue and 2415 * make sure that we have a covered ECNE in teh control chunk part. 2416 * If so remove it. 2417 */ 2418 struct sctp_tmit_chunk *chk; 2419 struct sctp_ecne_chunk *ecne; 2420 2421 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2422 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2423 continue; 2424 } 2425 /* 2426 * Look for and remove if it is the right TSN. Since there 2427 * is only ONE ECNE on the control queue at any one time we 2428 * don't need to worry about more than one! 2429 */ 2430 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2431 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2432 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2433 /* this covers this ECNE, we can remove it */ 2434 stcb->asoc.ecn_echo_cnt_onq--; 2435 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2436 sctp_next); 2437 if (chk->data) { 2438 sctp_m_freem(chk->data); 2439 chk->data = NULL; 2440 } 2441 stcb->asoc.ctrl_queue_cnt--; 2442 sctp_free_remote_addr(chk->whoTo); 2443 sctp_free_a_chunk(stcb, chk); 2444 break; 2445 } 2446 } 2447 } 2448 2449 static void 2450 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 2451 struct sctp_tcb *stcb, struct sctp_nets *net) 2452 { 2453 struct sctp_association *asoc; 2454 2455 #ifdef SCTP_DEBUG 2456 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2457 printf("sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2458 } 2459 #endif 2460 if (stcb == NULL) 2461 return; 2462 2463 asoc = &stcb->asoc; 2464 /* process according to association state */ 2465 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2466 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 2467 SCTP_TCB_UNLOCK(stcb); 2468 return; 2469 } 2470 /* notify upper layer protocol */ 2471 if (stcb->sctp_socket) { 2472 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 2473 /* are the queues empty? they should be */ 2474 if (!TAILQ_EMPTY(&asoc->send_queue) || 2475 !TAILQ_EMPTY(&asoc->sent_queue) || 2476 !TAILQ_EMPTY(&asoc->out_wheel)) { 2477 sctp_report_all_outbound(stcb, 0); 2478 } 2479 } 2480 /* stop the timer */ 2481 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2482 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 2483 /* free the TCB */ 2484 sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2485 return; 2486 } 2487 2488 static int 2489 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 2490 struct sctp_nets *net, uint8_t flg) 2491 { 2492 switch (desc->chunk_type) { 2493 case SCTP_DATA: 2494 /* find the tsn to resend (possibly */ 2495 { 2496 uint32_t tsn; 2497 struct sctp_tmit_chunk *tp1; 2498 2499 tsn = ntohl(desc->tsn_ifany); 2500 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2501 while (tp1) { 2502 if (tp1->rec.data.TSN_seq == tsn) { 2503 /* found it */ 2504 break; 2505 } 2506 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 2507 MAX_TSN)) { 2508 /* not found */ 2509 tp1 = NULL; 2510 break; 2511 } 2512 tp1 = TAILQ_NEXT(tp1, sctp_next); 2513 } 2514 if (tp1 == NULL) { 2515 /* 2516 * Do it the other way , aka without paying 2517 * attention to queue seq order. 2518 */ 2519 SCTP_STAT_INCR(sctps_pdrpdnfnd); 2520 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2521 while (tp1) { 2522 if (tp1->rec.data.TSN_seq == tsn) { 2523 /* found it */ 2524 break; 2525 } 2526 tp1 = TAILQ_NEXT(tp1, sctp_next); 2527 } 2528 } 2529 if (tp1 == NULL) { 2530 SCTP_STAT_INCR(sctps_pdrptsnnf); 2531 } 2532 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 2533 uint8_t *ddp; 2534 2535 if ((stcb->asoc.peers_rwnd == 0) && 2536 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 2537 SCTP_STAT_INCR(sctps_pdrpdiwnp); 2538 return (0); 2539 } 2540 if (stcb->asoc.peers_rwnd == 0 && 2541 (flg & SCTP_FROM_MIDDLE_BOX)) { 2542 SCTP_STAT_INCR(sctps_pdrpdizrw); 2543 return (0); 2544 } 2545 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 2546 sizeof(struct sctp_data_chunk)); 2547 { 2548 unsigned int iii; 2549 2550 for (iii = 0; iii < sizeof(desc->data_bytes); 2551 iii++) { 2552 if (ddp[iii] != desc->data_bytes[iii]) { 2553 SCTP_STAT_INCR(sctps_pdrpbadd); 2554 return (-1); 2555 } 2556 } 2557 } 2558 /* 2559 * We zero out the nonce so resync not 2560 * needed 2561 */ 2562 tp1->rec.data.ect_nonce = 0; 2563 2564 if (tp1->do_rtt) { 2565 /* 2566 * this guy had a RTO calculation 2567 * pending on it, cancel it 2568 */ 2569 tp1->do_rtt = 0; 2570 } 2571 SCTP_STAT_INCR(sctps_pdrpmark); 2572 if (tp1->sent != SCTP_DATAGRAM_RESEND) 2573 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2574 tp1->sent = SCTP_DATAGRAM_RESEND; 2575 /* 2576 * mark it as if we were doing a FR, since 2577 * we will be getting gap ack reports behind 2578 * the info from the router. 2579 */ 2580 tp1->rec.data.doing_fast_retransmit = 1; 2581 /* 2582 * mark the tsn with what sequences can 2583 * cause a new FR. 2584 */ 2585 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 2586 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 2587 } else { 2588 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 2589 } 2590 2591 /* restart the timer */ 2592 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2593 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2594 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2595 stcb, tp1->whoTo); 2596 2597 /* fix counts and things */ 2598 #ifdef SCTP_FLIGHT_LOGGING 2599 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN, 2600 tp1->whoTo->flight_size, 2601 tp1->book_size, 2602 (uintptr_t) stcb, 2603 tp1->rec.data.TSN_seq); 2604 #endif 2605 if (tp1->whoTo->flight_size >= tp1->book_size) 2606 tp1->whoTo->flight_size -= tp1->book_size; 2607 else 2608 tp1->whoTo->flight_size = 0; 2609 2610 if (stcb->asoc.total_flight >= tp1->book_size) { 2611 stcb->asoc.total_flight -= tp1->book_size; 2612 if (stcb->asoc.total_flight_count > 0) 2613 stcb->asoc.total_flight_count--; 2614 } else { 2615 stcb->asoc.total_flight = 0; 2616 stcb->asoc.total_flight_count = 0; 2617 } 2618 tp1->snd_count--; 2619 } { 2620 /* audit code */ 2621 unsigned int audit; 2622 2623 audit = 0; 2624 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 2625 if (tp1->sent == SCTP_DATAGRAM_RESEND) 2626 audit++; 2627 } 2628 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 2629 sctp_next) { 2630 if (tp1->sent == SCTP_DATAGRAM_RESEND) 2631 audit++; 2632 } 2633 if (audit != stcb->asoc.sent_queue_retran_cnt) { 2634 printf("**Local Audit finds cnt:%d asoc cnt:%d\n", 2635 audit, stcb->asoc.sent_queue_retran_cnt); 2636 #ifndef SCTP_AUDITING_ENABLED 2637 stcb->asoc.sent_queue_retran_cnt = audit; 2638 #endif 2639 } 2640 } 2641 } 2642 break; 2643 case SCTP_ASCONF: 2644 { 2645 struct sctp_tmit_chunk *asconf; 2646 2647 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 2648 sctp_next) { 2649 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 2650 break; 2651 } 2652 } 2653 if (asconf) { 2654 if (asconf->sent != SCTP_DATAGRAM_RESEND) 2655 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2656 asconf->sent = SCTP_DATAGRAM_RESEND; 2657 asconf->snd_count--; 2658 } 2659 } 2660 break; 2661 case SCTP_INITIATION: 2662 /* resend the INIT */ 2663 stcb->asoc.dropped_special_cnt++; 2664 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 2665 /* 2666 * If we can get it in, in a few attempts we do 2667 * this, otherwise we let the timer fire. 2668 */ 2669 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 2670 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 2671 sctp_send_initiate(stcb->sctp_ep, stcb); 2672 } 2673 break; 2674 case SCTP_SELECTIVE_ACK: 2675 /* resend the sack */ 2676 sctp_send_sack(stcb); 2677 break; 2678 case SCTP_HEARTBEAT_REQUEST: 2679 /* resend a demand HB */ 2680 sctp_send_hb(stcb, 1, net); 2681 break; 2682 case SCTP_SHUTDOWN: 2683 sctp_send_shutdown(stcb, net); 2684 break; 2685 case SCTP_SHUTDOWN_ACK: 2686 sctp_send_shutdown_ack(stcb, net); 2687 break; 2688 case SCTP_COOKIE_ECHO: 2689 { 2690 struct sctp_tmit_chunk *cookie; 2691 2692 cookie = NULL; 2693 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 2694 sctp_next) { 2695 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 2696 break; 2697 } 2698 } 2699 if (cookie) { 2700 if (cookie->sent != SCTP_DATAGRAM_RESEND) 2701 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2702 cookie->sent = SCTP_DATAGRAM_RESEND; 2703 sctp_stop_all_cookie_timers(stcb); 2704 } 2705 } 2706 break; 2707 case SCTP_COOKIE_ACK: 2708 sctp_send_cookie_ack(stcb); 2709 break; 2710 case SCTP_ASCONF_ACK: 2711 /* resend last asconf ack */ 2712 sctp_send_asconf_ack(stcb, 1); 2713 break; 2714 case SCTP_FORWARD_CUM_TSN: 2715 send_forward_tsn(stcb, &stcb->asoc); 2716 break; 2717 /* can't do anything with these */ 2718 case SCTP_PACKET_DROPPED: 2719 case SCTP_INITIATION_ACK: /* this should not happen */ 2720 case SCTP_HEARTBEAT_ACK: 2721 case SCTP_ABORT_ASSOCIATION: 2722 case SCTP_OPERATION_ERROR: 2723 case SCTP_SHUTDOWN_COMPLETE: 2724 case SCTP_ECN_ECHO: 2725 case SCTP_ECN_CWR: 2726 default: 2727 break; 2728 } 2729 return (0); 2730 } 2731 2732 void 2733 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2734 { 2735 int i; 2736 uint16_t temp; 2737 2738 /* 2739 * We set things to 0xffff since this is the last delivered sequence 2740 * and we will be sending in 0 after the reset. 2741 */ 2742 2743 if (number_entries) { 2744 for (i = 0; i < number_entries; i++) { 2745 temp = ntohs(list[i]); 2746 if (temp >= stcb->asoc.streamincnt) { 2747 continue; 2748 } 2749 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 2750 } 2751 } else { 2752 list = NULL; 2753 for (i = 0; i < stcb->asoc.streamincnt; i++) { 2754 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 2755 } 2756 } 2757 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list); 2758 } 2759 2760 static void 2761 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2762 { 2763 int i; 2764 2765 if (number_entries == 0) { 2766 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 2767 stcb->asoc.strmout[i].next_sequence_sent = 0; 2768 } 2769 } else if (number_entries) { 2770 for (i = 0; i < number_entries; i++) { 2771 uint16_t temp; 2772 2773 temp = ntohs(list[i]); 2774 if (temp >= stcb->asoc.streamoutcnt) { 2775 /* no such stream */ 2776 continue; 2777 } 2778 stcb->asoc.strmout[temp].next_sequence_sent = 0; 2779 } 2780 } 2781 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list); 2782 } 2783 2784 2785 struct sctp_stream_reset_out_request * 2786 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 2787 { 2788 struct sctp_association *asoc; 2789 struct sctp_stream_reset_out_req *req; 2790 struct sctp_stream_reset_out_request *r; 2791 struct sctp_tmit_chunk *chk; 2792 int len, clen; 2793 2794 asoc = &stcb->asoc; 2795 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 2796 return (NULL); 2797 } 2798 if (stcb->asoc.str_reset == NULL) { 2799 return (NULL); 2800 } 2801 chk = stcb->asoc.str_reset; 2802 if (chk->data == NULL) { 2803 return (NULL); 2804 } 2805 if (bchk) { 2806 /* he wants a copy of the chk pointer */ 2807 *bchk = chk; 2808 } 2809 clen = chk->send_size; 2810 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 2811 r = &req->sr_req; 2812 if (ntohl(r->request_seq) == seq) { 2813 /* found it */ 2814 return (r); 2815 } 2816 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 2817 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 2818 /* move to the next one, there can only be a max of two */ 2819 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 2820 if (ntohl(r->request_seq) == seq) { 2821 return (r); 2822 } 2823 } 2824 /* that seq is not here */ 2825 return (NULL); 2826 } 2827 2828 static void 2829 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 2830 { 2831 struct sctp_association *asoc; 2832 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 2833 2834 if (stcb->asoc.str_reset == NULL) { 2835 return; 2836 } 2837 asoc = &stcb->asoc; 2838 2839 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 2840 TAILQ_REMOVE(&asoc->control_send_queue, 2841 chk, 2842 sctp_next); 2843 if (chk->data) { 2844 sctp_m_freem(chk->data); 2845 chk->data = NULL; 2846 } 2847 asoc->ctrl_queue_cnt--; 2848 sctp_free_remote_addr(chk->whoTo); 2849 2850 sctp_free_a_chunk(stcb, chk); 2851 stcb->asoc.str_reset = NULL; 2852 } 2853 2854 2855 static int 2856 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 2857 uint32_t seq, uint32_t action, 2858 struct sctp_stream_reset_response *respin) 2859 { 2860 uint16_t type; 2861 int lparm_len; 2862 struct sctp_association *asoc = &stcb->asoc; 2863 struct sctp_tmit_chunk *chk; 2864 struct sctp_stream_reset_out_request *srparam; 2865 int number_entries; 2866 2867 if (asoc->stream_reset_outstanding == 0) { 2868 /* duplicate */ 2869 return (0); 2870 } 2871 if (seq == stcb->asoc.str_reset_seq_out) { 2872 srparam = sctp_find_stream_reset(stcb, seq, &chk); 2873 if (srparam) { 2874 stcb->asoc.str_reset_seq_out++; 2875 type = ntohs(srparam->ph.param_type); 2876 lparm_len = ntohs(srparam->ph.param_length); 2877 if (type == SCTP_STR_RESET_OUT_REQUEST) { 2878 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 2879 asoc->stream_reset_out_is_outstanding = 0; 2880 if (asoc->stream_reset_outstanding) 2881 asoc->stream_reset_outstanding--; 2882 if (action == SCTP_STREAM_RESET_PERFORMED) { 2883 /* do it */ 2884 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 2885 } else { 2886 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams); 2887 } 2888 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 2889 /* Answered my request */ 2890 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 2891 if (asoc->stream_reset_outstanding) 2892 asoc->stream_reset_outstanding--; 2893 if (action != SCTP_STREAM_RESET_PERFORMED) { 2894 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams); 2895 } 2896 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 2897 /** 2898 * a) Adopt the new in tsn. 2899 * b) reset the map 2900 * c) Adopt the new out-tsn 2901 */ 2902 struct sctp_stream_reset_response_tsn *resp; 2903 struct sctp_forward_tsn_chunk fwdtsn; 2904 int abort_flag = 0; 2905 2906 if (respin == NULL) { 2907 /* huh ? */ 2908 return (0); 2909 } 2910 if (action == SCTP_STREAM_RESET_PERFORMED) { 2911 resp = (struct sctp_stream_reset_response_tsn *)respin; 2912 asoc->stream_reset_outstanding--; 2913 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 2914 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 2915 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 2916 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag); 2917 if (abort_flag) { 2918 return (1); 2919 } 2920 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 2921 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 2922 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 2923 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 2924 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 2925 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 2926 2927 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 2928 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 2929 2930 } 2931 } 2932 /* get rid of the request and get the request flags */ 2933 if (asoc->stream_reset_outstanding == 0) { 2934 sctp_clean_up_stream_reset(stcb); 2935 } 2936 } 2937 } 2938 return (0); 2939 } 2940 2941 static void 2942 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 2943 struct sctp_tmit_chunk *chk, 2944 struct sctp_stream_reset_in_request *req) 2945 { 2946 uint32_t seq; 2947 int len, i; 2948 int number_entries; 2949 uint16_t temp; 2950 2951 /* 2952 * peer wants me to send a str-reset to him for my outgoing seq's if 2953 * seq_in is right. 2954 */ 2955 struct sctp_association *asoc = &stcb->asoc; 2956 2957 seq = ntohl(req->request_seq); 2958 if (asoc->str_reset_seq_in == seq) { 2959 if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 2960 len = ntohs(req->ph.param_length); 2961 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 2962 for (i = 0; i < number_entries; i++) { 2963 temp = ntohs(req->list_of_streams[i]); 2964 req->list_of_streams[i] = temp; 2965 } 2966 /* move the reset action back one */ 2967 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2968 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 2969 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 2970 asoc->str_reset_seq_out, 2971 seq, (asoc->sending_seq - 1)); 2972 asoc->stream_reset_out_is_outstanding = 1; 2973 asoc->str_reset = chk; 2974 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 2975 stcb->asoc.stream_reset_outstanding++; 2976 } else { 2977 /* Can't do it, since we have sent one out */ 2978 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2979 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 2980 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2981 } 2982 asoc->str_reset_seq_in++; 2983 } else if (asoc->str_reset_seq_in - 1 == seq) { 2984 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2985 } else if (asoc->str_reset_seq_in - 2 == seq) { 2986 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 2987 } else { 2988 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 2989 } 2990 } 2991 2992 static int 2993 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 2994 struct sctp_tmit_chunk *chk, 2995 struct sctp_stream_reset_tsn_request *req) 2996 { 2997 /* reset all in and out and update the tsn */ 2998 /* 2999 * A) reset my str-seq's on in and out. B) Select a receive next, 3000 * and set cum-ack to it. Also process this selected number as a 3001 * fwd-tsn as well. C) set in the response my next sending seq. 3002 */ 3003 struct sctp_forward_tsn_chunk fwdtsn; 3004 struct sctp_association *asoc = &stcb->asoc; 3005 int abort_flag = 0; 3006 uint32_t seq; 3007 3008 seq = ntohl(req->request_seq); 3009 if (asoc->str_reset_seq_in == seq) { 3010 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3011 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3012 fwdtsn.ch.chunk_flags = 0; 3013 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3014 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag); 3015 if (abort_flag) { 3016 return (1); 3017 } 3018 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3019 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3020 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3021 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3022 atomic_add_int(&stcb->asoc.sending_seq, 1); 3023 /* save off historical data for retrans */ 3024 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3025 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3026 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3027 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3028 3029 sctp_add_stream_reset_result_tsn(chk, 3030 ntohl(req->request_seq), 3031 SCTP_STREAM_RESET_PERFORMED, 3032 stcb->asoc.sending_seq, 3033 stcb->asoc.mapping_array_base_tsn); 3034 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3035 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3036 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3037 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3038 3039 asoc->str_reset_seq_in++; 3040 } else if (asoc->str_reset_seq_in - 1 == seq) { 3041 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3042 stcb->asoc.last_sending_seq[0], 3043 stcb->asoc.last_base_tsnsent[0] 3044 ); 3045 } else if (asoc->str_reset_seq_in - 2 == seq) { 3046 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3047 stcb->asoc.last_sending_seq[1], 3048 stcb->asoc.last_base_tsnsent[1] 3049 ); 3050 } else { 3051 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3052 } 3053 return (0); 3054 } 3055 3056 static void 3057 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3058 struct sctp_tmit_chunk *chk, 3059 struct sctp_stream_reset_out_request *req) 3060 { 3061 uint32_t seq, tsn; 3062 int number_entries, len; 3063 struct sctp_association *asoc = &stcb->asoc; 3064 3065 seq = ntohl(req->request_seq); 3066 3067 /* now if its not a duplicate we process it */ 3068 if (asoc->str_reset_seq_in == seq) { 3069 len = ntohs(req->ph.param_length); 3070 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3071 /* 3072 * the sender is resetting, handle the list issue.. we must 3073 * a) verify if we can do the reset, if so no problem b) If 3074 * we can't do the reset we must copy the request. c) queue 3075 * it, and setup the data in processor to trigger it off 3076 * when needed and dequeue all the queued data. 3077 */ 3078 tsn = ntohl(req->send_reset_at_tsn); 3079 3080 /* move the reset action back one */ 3081 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3082 if ((tsn == asoc->cumulative_tsn) || 3083 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3084 /* we can do it now */ 3085 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3086 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3087 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3088 } else { 3089 /* 3090 * we must queue it up and thus wait for the TSN's 3091 * to arrive that are at or before tsn 3092 */ 3093 struct sctp_stream_reset_list *liste; 3094 int siz; 3095 3096 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3097 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3098 siz, "StrRstList"); 3099 if (liste == NULL) { 3100 /* gak out of memory */ 3101 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3102 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3103 return; 3104 } 3105 liste->tsn = tsn; 3106 liste->number_entries = number_entries; 3107 memcpy(&liste->req, req, 3108 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3109 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3110 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3111 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3112 } 3113 asoc->str_reset_seq_in++; 3114 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3115 /* 3116 * one seq back, just echo back last action since my 3117 * response was lost. 3118 */ 3119 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3120 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3121 /* 3122 * two seq back, just echo back last action since my 3123 * response was lost. 3124 */ 3125 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3126 } else { 3127 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3128 } 3129 } 3130 3131 static int 3132 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct sctp_stream_reset_out_req *sr_req) 3133 { 3134 int chk_length, param_len, ptype; 3135 uint32_t seq; 3136 int num_req = 0; 3137 struct sctp_tmit_chunk *chk; 3138 struct sctp_chunkhdr *ch; 3139 struct sctp_paramhdr *ph; 3140 int ret_code = 0; 3141 int num_param = 0; 3142 3143 /* now it may be a reset or a reset-response */ 3144 chk_length = ntohs(sr_req->ch.chunk_length); 3145 3146 /* setup for adding the response */ 3147 sctp_alloc_a_chunk(stcb, chk); 3148 if (chk == NULL) { 3149 return (ret_code); 3150 } 3151 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3152 chk->asoc = &stcb->asoc; 3153 chk->no_fr_allowed = 0; 3154 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3155 chk->book_size_scale = 0; 3156 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3157 if (chk->data == NULL) { 3158 strres_nochunk: 3159 if (chk->data) { 3160 sctp_m_freem(chk->data); 3161 chk->data = NULL; 3162 } 3163 sctp_free_a_chunk(stcb, chk); 3164 return (ret_code); 3165 } 3166 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3167 3168 /* setup chunk parameters */ 3169 chk->sent = SCTP_DATAGRAM_UNSENT; 3170 chk->snd_count = 0; 3171 chk->whoTo = stcb->asoc.primary_destination; 3172 atomic_add_int(&chk->whoTo->ref_count, 1); 3173 3174 ch = mtod(chk->data, struct sctp_chunkhdr *); 3175 ch->chunk_type = SCTP_STREAM_RESET; 3176 ch->chunk_flags = 0; 3177 ch->chunk_length = htons(chk->send_size); 3178 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3179 3180 ph = (struct sctp_paramhdr *)&sr_req->sr_req; 3181 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3182 param_len = ntohs(ph->param_length); 3183 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3184 /* bad param */ 3185 break; 3186 } 3187 ptype = ntohs(ph->param_type); 3188 num_param++; 3189 if (num_param > SCTP_MAX_RESET_PARAMS) { 3190 /* hit the max of parameters already sorry.. */ 3191 break; 3192 } 3193 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3194 struct sctp_stream_reset_out_request *req_out; 3195 3196 req_out = (struct sctp_stream_reset_out_request *)ph; 3197 num_req++; 3198 if (stcb->asoc.stream_reset_outstanding) { 3199 seq = ntohl(req_out->response_seq); 3200 if (seq == stcb->asoc.str_reset_seq_out) { 3201 /* implicit ack */ 3202 sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3203 } 3204 } 3205 sctp_handle_str_reset_request_out(stcb, chk, req_out); 3206 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3207 struct sctp_stream_reset_in_request *req_in; 3208 3209 num_req++; 3210 req_in = (struct sctp_stream_reset_in_request *)ph; 3211 sctp_handle_str_reset_request_in(stcb, chk, req_in); 3212 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3213 struct sctp_stream_reset_tsn_request *req_tsn; 3214 3215 num_req++; 3216 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3217 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3218 ret_code = 1; 3219 goto strres_nochunk; 3220 } 3221 /* no more */ 3222 break; 3223 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3224 struct sctp_stream_reset_response *resp; 3225 uint32_t result; 3226 3227 resp = (struct sctp_stream_reset_response *)ph; 3228 seq = ntohl(resp->response_seq); 3229 result = ntohl(resp->result); 3230 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3231 ret_code = 1; 3232 goto strres_nochunk; 3233 } 3234 } else { 3235 break; 3236 } 3237 3238 ph = (struct sctp_paramhdr *)((caddr_t)ph + SCTP_SIZE32(param_len)); 3239 chk_length -= SCTP_SIZE32(param_len); 3240 } 3241 if (num_req == 0) { 3242 /* we have no response free the stuff */ 3243 goto strres_nochunk; 3244 } 3245 /* ok we have a chunk to link in */ 3246 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3247 chk, 3248 sctp_next); 3249 stcb->asoc.ctrl_queue_cnt++; 3250 return (ret_code); 3251 } 3252 3253 /* 3254 * Handle a router or endpoints report of a packet loss, there are two ways 3255 * to handle this, either we get the whole packet and must disect it 3256 * ourselves (possibly with truncation and or corruption) or it is a summary 3257 * from a middle box that did the disectting for us. 3258 */ 3259 static void 3260 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3261 struct sctp_tcb *stcb, struct sctp_nets *net) 3262 { 3263 uint32_t bottle_bw, on_queue; 3264 uint16_t trunc_len; 3265 unsigned int chlen; 3266 unsigned int at; 3267 struct sctp_chunk_desc desc; 3268 struct sctp_chunkhdr *ch; 3269 3270 chlen = ntohs(cp->ch.chunk_length); 3271 chlen -= sizeof(struct sctp_pktdrop_chunk); 3272 /* XXX possible chlen underflow */ 3273 if (chlen == 0) { 3274 ch = NULL; 3275 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3276 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3277 } else { 3278 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3279 chlen -= sizeof(struct sctphdr); 3280 /* XXX possible chlen underflow */ 3281 memset(&desc, 0, sizeof(desc)); 3282 } 3283 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3284 /* now the chunks themselves */ 3285 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 3286 desc.chunk_type = ch->chunk_type; 3287 /* get amount we need to move */ 3288 at = ntohs(ch->chunk_length); 3289 if (at < sizeof(struct sctp_chunkhdr)) { 3290 /* corrupt chunk, maybe at the end? */ 3291 SCTP_STAT_INCR(sctps_pdrpcrupt); 3292 break; 3293 } 3294 if (trunc_len == 0) { 3295 /* we are supposed to have all of it */ 3296 if (at > chlen) { 3297 /* corrupt skip it */ 3298 SCTP_STAT_INCR(sctps_pdrpcrupt); 3299 break; 3300 } 3301 } else { 3302 /* is there enough of it left ? */ 3303 if (desc.chunk_type == SCTP_DATA) { 3304 if (chlen < (sizeof(struct sctp_data_chunk) + 3305 sizeof(desc.data_bytes))) { 3306 break; 3307 } 3308 } else { 3309 if (chlen < sizeof(struct sctp_chunkhdr)) { 3310 break; 3311 } 3312 } 3313 } 3314 if (desc.chunk_type == SCTP_DATA) { 3315 /* can we get out the tsn? */ 3316 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3317 SCTP_STAT_INCR(sctps_pdrpmbda); 3318 3319 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 3320 /* yep */ 3321 struct sctp_data_chunk *dcp; 3322 uint8_t *ddp; 3323 unsigned int iii; 3324 3325 dcp = (struct sctp_data_chunk *)ch; 3326 ddp = (uint8_t *) (dcp + 1); 3327 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 3328 desc.data_bytes[iii] = ddp[iii]; 3329 } 3330 desc.tsn_ifany = dcp->dp.tsn; 3331 } else { 3332 /* nope we are done. */ 3333 SCTP_STAT_INCR(sctps_pdrpnedat); 3334 break; 3335 } 3336 } else { 3337 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3338 SCTP_STAT_INCR(sctps_pdrpmbct); 3339 } 3340 3341 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 3342 SCTP_STAT_INCR(sctps_pdrppdbrk); 3343 break; 3344 } 3345 if (SCTP_SIZE32(at) > chlen) { 3346 break; 3347 } 3348 chlen -= SCTP_SIZE32(at); 3349 if (chlen < sizeof(struct sctp_chunkhdr)) { 3350 /* done, none left */ 3351 break; 3352 } 3353 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 3354 } 3355 /* Now update any rwnd --- possibly */ 3356 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 3357 /* From a peer, we get a rwnd report */ 3358 uint32_t a_rwnd; 3359 3360 SCTP_STAT_INCR(sctps_pdrpfehos); 3361 3362 bottle_bw = ntohl(cp->bottle_bw); 3363 on_queue = ntohl(cp->current_onq); 3364 if (bottle_bw && on_queue) { 3365 /* a rwnd report is in here */ 3366 if (bottle_bw > on_queue) 3367 a_rwnd = bottle_bw - on_queue; 3368 else 3369 a_rwnd = 0; 3370 3371 if (a_rwnd == 0) 3372 stcb->asoc.peers_rwnd = 0; 3373 else { 3374 if (a_rwnd > stcb->asoc.total_flight) { 3375 stcb->asoc.peers_rwnd = 3376 a_rwnd - stcb->asoc.total_flight; 3377 } else { 3378 stcb->asoc.peers_rwnd = 0; 3379 } 3380 if (stcb->asoc.peers_rwnd < 3381 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3382 /* SWS sender side engages */ 3383 stcb->asoc.peers_rwnd = 0; 3384 } 3385 } 3386 } 3387 } else { 3388 SCTP_STAT_INCR(sctps_pdrpfmbox); 3389 } 3390 3391 /* now middle boxes in sat networks get a cwnd bump */ 3392 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 3393 (stcb->asoc.sat_t3_loss_recovery == 0) && 3394 (stcb->asoc.sat_network)) { 3395 /* 3396 * This is debateable but for sat networks it makes sense 3397 * Note if a T3 timer has went off, we will prohibit any 3398 * changes to cwnd until we exit the t3 loss recovery. 3399 */ 3400 uint32_t bw_avail; 3401 int rtt, incr; 3402 3403 #ifdef SCTP_CWND_MONITOR 3404 int old_cwnd = net->cwnd; 3405 3406 #endif 3407 /* need real RTT for this calc */ 3408 rtt = ((net->lastsa >> 2) + net->lastsv) >> 1; 3409 /* get bottle neck bw */ 3410 bottle_bw = ntohl(cp->bottle_bw); 3411 /* and whats on queue */ 3412 on_queue = ntohl(cp->current_onq); 3413 /* 3414 * adjust the on-queue if our flight is more it could be 3415 * that the router has not yet gotten data "in-flight" to it 3416 */ 3417 if (on_queue < net->flight_size) 3418 on_queue = net->flight_size; 3419 3420 /* calculate the available space */ 3421 bw_avail = (bottle_bw * rtt) / 1000; 3422 if (bw_avail > bottle_bw) { 3423 /* 3424 * Cap the growth to no more than the bottle neck. 3425 * This can happen as RTT slides up due to queues. 3426 * It also means if you have more than a 1 second 3427 * RTT with a empty queue you will be limited to the 3428 * bottle_bw per second no matter if other points 3429 * have 1/2 the RTT and you could get more out... 3430 */ 3431 bw_avail = bottle_bw; 3432 } 3433 if (on_queue > bw_avail) { 3434 /* 3435 * No room for anything else don't allow anything 3436 * else to be "added to the fire". 3437 */ 3438 int seg_inflight, seg_onqueue, my_portion; 3439 3440 net->partial_bytes_acked = 0; 3441 3442 /* how much are we over queue size? */ 3443 incr = on_queue - bw_avail; 3444 if (stcb->asoc.seen_a_sack_this_pkt) { 3445 /* 3446 * undo any cwnd adjustment that the sack 3447 * might have made 3448 */ 3449 net->cwnd = net->prev_cwnd; 3450 } 3451 /* Now how much of that is mine? */ 3452 seg_inflight = net->flight_size / net->mtu; 3453 seg_onqueue = on_queue / net->mtu; 3454 my_portion = (incr * seg_inflight) / seg_onqueue; 3455 3456 /* Have I made an adjustment already */ 3457 if (net->cwnd > net->flight_size) { 3458 /* 3459 * for this flight I made an adjustment we 3460 * need to decrease the portion by a share 3461 * our previous adjustment. 3462 */ 3463 int diff_adj; 3464 3465 diff_adj = net->cwnd - net->flight_size; 3466 if (diff_adj > my_portion) 3467 my_portion = 0; 3468 else 3469 my_portion -= diff_adj; 3470 } 3471 /* 3472 * back down to the previous cwnd (assume we have 3473 * had a sack before this packet). minus what ever 3474 * portion of the overage is my fault. 3475 */ 3476 net->cwnd -= my_portion; 3477 3478 /* we will NOT back down more than 1 MTU */ 3479 if (net->cwnd <= net->mtu) { 3480 net->cwnd = net->mtu; 3481 } 3482 /* force into CA */ 3483 net->ssthresh = net->cwnd - 1; 3484 } else { 3485 /* 3486 * Take 1/4 of the space left or max burst up .. 3487 * whichever is less. 3488 */ 3489 incr = min((bw_avail - on_queue) >> 2, 3490 (int)stcb->asoc.max_burst * (int)net->mtu); 3491 net->cwnd += incr; 3492 } 3493 if (net->cwnd > bw_avail) { 3494 /* We can't exceed the pipe size */ 3495 net->cwnd = bw_avail; 3496 } 3497 if (net->cwnd < net->mtu) { 3498 /* We always have 1 MTU */ 3499 net->cwnd = net->mtu; 3500 } 3501 #ifdef SCTP_CWND_MONITOR 3502 if (net->cwnd - old_cwnd != 0) { 3503 /* log only changes */ 3504 sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 3505 SCTP_CWND_LOG_FROM_SAT); 3506 } 3507 #endif 3508 } 3509 } 3510 3511 /* 3512 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 3513 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 3514 * offset: offset into the mbuf chain to first chunkhdr - length: is the 3515 * length of the complete packet outputs: - length: modified to remaining 3516 * length after control processing - netp: modified to new sctp_nets after 3517 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 3518 * bad packet,...) otherwise return the tcb for this packet 3519 */ 3520 static struct sctp_tcb * 3521 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 3522 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 3523 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen) 3524 { 3525 struct sctp_association *asoc; 3526 uint32_t vtag_in; 3527 int num_chunks = 0; /* number of control chunks processed */ 3528 int chk_length; 3529 int ret; 3530 3531 /* 3532 * How big should this be, and should it be alloc'd? Lets try the 3533 * d-mtu-ceiling for now (2k) and that should hopefully work ... 3534 * until we get into jumbo grams and such.. 3535 */ 3536 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 3537 struct sctp_tcb *locked_tcb = stcb; 3538 int got_auth = 0; 3539 uint32_t auth_offset = 0, auth_len = 0; 3540 int auth_skipped = 0; 3541 3542 #ifdef SCTP_DEBUG 3543 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 3544 printf("sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 3545 iphlen, *offset, length, stcb); 3546 } 3547 #endif /* SCTP_DEBUG */ 3548 3549 /* validate chunk header length... */ 3550 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 3551 return (NULL); 3552 } 3553 /* 3554 * validate the verification tag 3555 */ 3556 vtag_in = ntohl(sh->v_tag); 3557 3558 if (locked_tcb) { 3559 SCTP_TCB_LOCK_ASSERT(locked_tcb); 3560 } 3561 if (ch->chunk_type == SCTP_INITIATION) { 3562 if (vtag_in != 0) { 3563 /* protocol error- silently discard... */ 3564 SCTP_STAT_INCR(sctps_badvtag); 3565 if (locked_tcb) 3566 SCTP_TCB_UNLOCK(locked_tcb); 3567 return (NULL); 3568 } 3569 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 3570 /* 3571 * If there is no stcb, skip the AUTH chunk and process 3572 * later after a stcb is found (to validate the lookup was 3573 * valid. 3574 */ 3575 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 3576 (stcb == NULL) && !sctp_auth_disable) { 3577 /* save this chunk for later processing */ 3578 auth_skipped = 1; 3579 auth_offset = *offset; 3580 auth_len = ntohs(ch->chunk_length); 3581 3582 /* (temporarily) move past this chunk */ 3583 *offset += SCTP_SIZE32(auth_len); 3584 if (*offset >= length) { 3585 /* no more data left in the mbuf chain */ 3586 *offset = length; 3587 return (NULL); 3588 } 3589 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3590 sizeof(struct sctp_chunkhdr), chunk_buf); 3591 } 3592 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 3593 goto process_control_chunks; 3594 } 3595 /* 3596 * first check if it's an ASCONF with an unknown src addr we 3597 * need to look inside to find the association 3598 */ 3599 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 3600 /* inp's refcount may be reduced */ 3601 SCTP_INP_INCR_REF(inp); 3602 3603 stcb = sctp_findassociation_ep_asconf(m, iphlen, 3604 *offset, sh, &inp, netp); 3605 if (stcb == NULL) { 3606 /* 3607 * reduce inp's refcount if not reduced in 3608 * sctp_findassociation_ep_asconf(). 3609 */ 3610 SCTP_INP_DECR_REF(inp); 3611 } 3612 /* now go back and verify any auth chunk to be sure */ 3613 if (auth_skipped && (stcb != NULL)) { 3614 struct sctp_auth_chunk *auth; 3615 3616 auth = (struct sctp_auth_chunk *) 3617 sctp_m_getptr(m, auth_offset, 3618 auth_len, chunk_buf); 3619 got_auth = 1; 3620 auth_skipped = 0; 3621 if (sctp_handle_auth(stcb, auth, m, 3622 auth_offset)) { 3623 /* auth HMAC failed so dump it */ 3624 *offset = length; 3625 return (NULL); 3626 } else { 3627 /* remaining chunks are HMAC checked */ 3628 stcb->asoc.authenticated = 1; 3629 } 3630 } 3631 } 3632 if (stcb == NULL) { 3633 /* no association, so it's out of the blue... */ 3634 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL); 3635 *offset = length; 3636 if (locked_tcb) 3637 SCTP_TCB_UNLOCK(locked_tcb); 3638 return (NULL); 3639 } 3640 asoc = &stcb->asoc; 3641 /* ABORT and SHUTDOWN can use either v_tag... */ 3642 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 3643 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 3644 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 3645 if ((vtag_in == asoc->my_vtag) || 3646 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 3647 (vtag_in == asoc->peer_vtag))) { 3648 /* this is valid */ 3649 } else { 3650 /* drop this packet... */ 3651 SCTP_STAT_INCR(sctps_badvtag); 3652 if (locked_tcb) 3653 SCTP_TCB_UNLOCK(locked_tcb); 3654 return (NULL); 3655 } 3656 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 3657 if (vtag_in != asoc->my_vtag) { 3658 /* 3659 * this could be a stale SHUTDOWN-ACK or the 3660 * peer never got the SHUTDOWN-COMPLETE and 3661 * is still hung; we have started a new asoc 3662 * but it won't complete until the shutdown 3663 * is completed 3664 */ 3665 if (locked_tcb) 3666 SCTP_TCB_UNLOCK(locked_tcb); 3667 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 3668 NULL); 3669 return (NULL); 3670 } 3671 } else { 3672 /* for all other chunks, vtag must match */ 3673 if (vtag_in != asoc->my_vtag) { 3674 /* invalid vtag... */ 3675 #ifdef SCTP_DEBUG 3676 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3677 printf("invalid vtag: %xh, expect %xh\n", vtag_in, asoc->my_vtag); 3678 } 3679 #endif /* SCTP_DEBUG */ 3680 SCTP_STAT_INCR(sctps_badvtag); 3681 if (locked_tcb) 3682 SCTP_TCB_UNLOCK(locked_tcb); 3683 *offset = length; 3684 return (NULL); 3685 } 3686 } 3687 } /* end if !SCTP_COOKIE_ECHO */ 3688 /* 3689 * process all control chunks... 3690 */ 3691 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 3692 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 3693 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 3694 /* implied cookie-ack.. we must have lost the ack */ 3695 stcb->asoc.overall_error_count = 0; 3696 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 3697 *netp); 3698 } 3699 process_control_chunks: 3700 3701 while (IS_SCTP_CONTROL(ch)) { 3702 /* validate chunk length */ 3703 chk_length = ntohs(ch->chunk_length); 3704 #ifdef SCTP_DEBUG 3705 if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 3706 printf("sctp_process_control: processing a chunk type=%u, len=%u\n", 3707 ch->chunk_type, chk_length); 3708 } 3709 #endif /* SCTP_DEBUG */ 3710 if ((size_t)chk_length < sizeof(*ch) || 3711 (*offset + chk_length) > length) { 3712 *offset = length; 3713 if (locked_tcb) 3714 SCTP_TCB_UNLOCK(locked_tcb); 3715 return (NULL); 3716 } 3717 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 3718 /* 3719 * INIT-ACK only gets the init ack "header" portion only 3720 * because we don't have to process the peer's COOKIE. All 3721 * others get a complete chunk. 3722 */ 3723 if (ch->chunk_type == SCTP_INITIATION_ACK) { 3724 /* get an init-ack chunk */ 3725 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3726 sizeof(struct sctp_init_ack_chunk), chunk_buf); 3727 if (ch == NULL) { 3728 *offset = length; 3729 if (locked_tcb) 3730 SCTP_TCB_UNLOCK(locked_tcb); 3731 return (NULL); 3732 } 3733 } else { 3734 /* get a complete chunk... */ 3735 if ((size_t)chk_length > sizeof(chunk_buf)) { 3736 struct mbuf *oper; 3737 struct sctp_paramhdr *phdr; 3738 3739 oper = NULL; 3740 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 3741 0, M_DONTWAIT, 1, MT_DATA); 3742 if (oper) { 3743 /* pre-reserve some space */ 3744 SCTP_BUF_RESV_UF(oper, sizeof(struct sctp_chunkhdr)); 3745 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr); 3746 phdr = mtod(oper, struct sctp_paramhdr *); 3747 phdr->param_type = htons(SCTP_CAUSE_OUT_OF_RESC); 3748 phdr->param_length = htons(sizeof(struct sctp_paramhdr)); 3749 sctp_queue_op_err(stcb, oper); 3750 } 3751 if (locked_tcb) 3752 SCTP_TCB_UNLOCK(locked_tcb); 3753 return (NULL); 3754 } 3755 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3756 chk_length, chunk_buf); 3757 if (ch == NULL) { 3758 printf("sctp_process_control: Can't get the all data....\n"); 3759 *offset = length; 3760 if (locked_tcb) 3761 SCTP_TCB_UNLOCK(locked_tcb); 3762 return (NULL); 3763 } 3764 } 3765 num_chunks++; 3766 /* Save off the last place we got a control from */ 3767 if (stcb != NULL) { 3768 if ((*netp != NULL) || (ch->chunk_type == SCTP_ASCONF)) { 3769 /* 3770 * allow last_control to be NULL if 3771 * ASCONF... ASCONF processing will find the 3772 * right net later 3773 */ 3774 stcb->asoc.last_control_chunk_from = *netp; 3775 } 3776 } 3777 #ifdef SCTP_AUDITING_ENABLED 3778 sctp_audit_log(0xB0, ch->chunk_type); 3779 #endif 3780 3781 /* check to see if this chunk required auth, but isn't */ 3782 if ((stcb != NULL) && !sctp_auth_disable && 3783 sctp_auth_is_required_chunk(ch->chunk_type, 3784 stcb->asoc.local_auth_chunks) && 3785 !stcb->asoc.authenticated) { 3786 /* "silently" ignore */ 3787 SCTP_STAT_INCR(sctps_recvauthmissing); 3788 goto next_chunk; 3789 } 3790 switch (ch->chunk_type) { 3791 case SCTP_INITIATION: 3792 /* must be first and only chunk */ 3793 #ifdef SCTP_DEBUG 3794 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3795 printf("SCTP_INIT\n"); 3796 } 3797 #endif /* SCTP_DEBUG */ 3798 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3799 /* We are not interested anymore? */ 3800 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3801 /* 3802 * collision case where we are 3803 * sending to them too 3804 */ 3805 ; 3806 } else { 3807 if (locked_tcb) 3808 SCTP_TCB_UNLOCK(locked_tcb); 3809 *offset = length; 3810 return (NULL); 3811 } 3812 } 3813 if ((num_chunks > 1) || 3814 (sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) { 3815 *offset = length; 3816 if (locked_tcb) 3817 SCTP_TCB_UNLOCK(locked_tcb); 3818 return (NULL); 3819 } 3820 if ((stcb != NULL) && 3821 (SCTP_GET_STATE(&stcb->asoc) == 3822 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 3823 sctp_send_shutdown_ack(stcb, 3824 stcb->asoc.primary_destination); 3825 *offset = length; 3826 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3827 if (locked_tcb) 3828 SCTP_TCB_UNLOCK(locked_tcb); 3829 return (NULL); 3830 } 3831 sctp_handle_init(m, iphlen, *offset, sh, 3832 (struct sctp_init_chunk *)ch, inp, stcb, *netp); 3833 *offset = length; 3834 if (locked_tcb) 3835 SCTP_TCB_UNLOCK(locked_tcb); 3836 return (NULL); 3837 break; 3838 case SCTP_INITIATION_ACK: 3839 /* must be first and only chunk */ 3840 #ifdef SCTP_DEBUG 3841 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3842 printf("SCTP_INIT-ACK\n"); 3843 } 3844 #endif /* SCTP_DEBUG */ 3845 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3846 /* We are not interested anymore */ 3847 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3848 ; 3849 } else { 3850 if (locked_tcb) 3851 SCTP_TCB_UNLOCK(locked_tcb); 3852 *offset = length; 3853 if (stcb) { 3854 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3855 } 3856 return (NULL); 3857 } 3858 } 3859 if ((num_chunks > 1) || 3860 (sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) { 3861 *offset = length; 3862 if (locked_tcb) 3863 SCTP_TCB_UNLOCK(locked_tcb); 3864 return (NULL); 3865 } 3866 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 3867 (struct sctp_init_ack_chunk *)ch, stcb, *netp); 3868 /* 3869 * Special case, I must call the output routine to 3870 * get the cookie echoed 3871 */ 3872 if ((stcb) && ret == 0) 3873 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3874 *offset = length; 3875 if (locked_tcb) 3876 SCTP_TCB_UNLOCK(locked_tcb); 3877 return (NULL); 3878 break; 3879 case SCTP_SELECTIVE_ACK: 3880 #ifdef SCTP_DEBUG 3881 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3882 printf("SCTP_SACK\n"); 3883 } 3884 #endif /* SCTP_DEBUG */ 3885 SCTP_STAT_INCR(sctps_recvsacks); 3886 { 3887 struct sctp_sack_chunk *sack; 3888 int abort_now = 0; 3889 uint32_t a_rwnd, cum_ack; 3890 uint16_t num_seg; 3891 int nonce_sum_flag; 3892 3893 sack = (struct sctp_sack_chunk *)ch; 3894 3895 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 3896 cum_ack = ntohl(sack->sack.cum_tsn_ack); 3897 num_seg = ntohs(sack->sack.num_gap_ack_blks); 3898 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 3899 stcb->asoc.seen_a_sack_this_pkt = 1; 3900 if ((stcb->asoc.pr_sctp_cnt == 0) && 3901 (num_seg == 0) && 3902 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 3903 (cum_ack == stcb->asoc.last_acked_seq)) && 3904 (stcb->asoc.saw_sack_with_frags == 0) && 3905 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 3906 ) { 3907 /* 3908 * We have a SIMPLE sack having no 3909 * prior segments and data on sent 3910 * queue to be acked.. Use the 3911 * faster path sack processing. We 3912 * also allow window update sacks 3913 * with no missing segments to go 3914 * this way too. 3915 */ 3916 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, &abort_now); 3917 } else { 3918 sctp_handle_sack(sack, stcb, *netp, &abort_now); 3919 } 3920 if (abort_now) { 3921 /* ABORT signal from sack processing */ 3922 *offset = length; 3923 return (NULL); 3924 } 3925 } 3926 break; 3927 case SCTP_HEARTBEAT_REQUEST: 3928 #ifdef SCTP_DEBUG 3929 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3930 printf("SCTP_HEARTBEAT\n"); 3931 } 3932 #endif /* SCTP_DEBUG */ 3933 SCTP_STAT_INCR(sctps_recvheartbeat); 3934 sctp_send_heartbeat_ack(stcb, m, *offset, chk_length, 3935 *netp); 3936 3937 /* He's alive so give him credit */ 3938 stcb->asoc.overall_error_count = 0; 3939 break; 3940 case SCTP_HEARTBEAT_ACK: 3941 #ifdef SCTP_DEBUG 3942 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3943 printf("SCTP_HEARTBEAT-ACK\n"); 3944 } 3945 #endif /* SCTP_DEBUG */ 3946 3947 /* He's alive so give him credit */ 3948 stcb->asoc.overall_error_count = 0; 3949 SCTP_STAT_INCR(sctps_recvheartbeatack); 3950 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 3951 stcb, *netp); 3952 break; 3953 case SCTP_ABORT_ASSOCIATION: 3954 #ifdef SCTP_DEBUG 3955 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3956 printf("SCTP_ABORT\n"); 3957 } 3958 #endif /* SCTP_DEBUG */ 3959 sctp_handle_abort((struct sctp_abort_chunk *)ch, 3960 stcb, *netp); 3961 *offset = length; 3962 return (NULL); 3963 break; 3964 case SCTP_SHUTDOWN: 3965 #ifdef SCTP_DEBUG 3966 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3967 printf("SCTP_SHUTDOWN\n"); 3968 } 3969 #endif /* SCTP_DEBUG */ 3970 { 3971 int abort_flag = 0; 3972 3973 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 3974 stcb, *netp, &abort_flag); 3975 if (abort_flag) { 3976 *offset = length; 3977 return (NULL); 3978 } 3979 } 3980 break; 3981 case SCTP_SHUTDOWN_ACK: 3982 #ifdef SCTP_DEBUG 3983 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3984 printf("SCTP_SHUTDOWN-ACK\n"); 3985 } 3986 #endif /* SCTP_DEBUG */ 3987 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 3988 *offset = length; 3989 return (NULL); 3990 break; 3991 case SCTP_OPERATION_ERROR: 3992 #ifdef SCTP_DEBUG 3993 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3994 printf("SCTP_OP-ERR\n"); 3995 } 3996 #endif /* SCTP_DEBUG */ 3997 if (sctp_handle_error(ch, stcb, *netp) < 0) { 3998 *offset = length; 3999 return (NULL); 4000 } 4001 break; 4002 case SCTP_COOKIE_ECHO: 4003 #ifdef SCTP_DEBUG 4004 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4005 printf("SCTP_COOKIE-ECHO stcb is %p\n", stcb); 4006 } 4007 #endif /* SCTP_DEBUG */ 4008 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4009 ; 4010 } else { 4011 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) && 4012 (stcb == NULL)) { 4013 /* We are not interested anymore */ 4014 *offset = length; 4015 return (NULL); 4016 } 4017 } 4018 /* 4019 * First are we accepting? We do this again here 4020 * since it is possible that a previous endpoint WAS 4021 * listening responded to a INIT-ACK and then 4022 * closed. We opened and bound.. and are now no 4023 * longer listening. 4024 */ 4025 if (inp->sctp_socket->so_qlimit == 0) { 4026 if ((stcb) && (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 4027 /* 4028 * special case, is this a retran'd 4029 * COOKIE-ECHO or a restarting assoc 4030 * that is a peeled off or 4031 * one-to-one style socket. 4032 */ 4033 goto process_cookie_anyway; 4034 } 4035 sctp_abort_association(inp, stcb, m, iphlen, sh, 4036 NULL); 4037 *offset = length; 4038 return (NULL); 4039 } else if (inp->sctp_socket->so_qlimit) { 4040 /* we are accepting so check limits like TCP */ 4041 if (inp->sctp_socket->so_qlen > 4042 inp->sctp_socket->so_qlimit) { 4043 /* no space */ 4044 struct mbuf *oper; 4045 struct sctp_paramhdr *phdr; 4046 4047 if (sctp_abort_if_one_2_one_hits_limit) { 4048 oper = NULL; 4049 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4050 0, M_DONTWAIT, 1, MT_DATA); 4051 if (oper) { 4052 SCTP_BUF_LEN(oper) = 4053 sizeof(struct sctp_paramhdr); 4054 phdr = mtod(oper, 4055 struct sctp_paramhdr *); 4056 phdr->param_type = 4057 htons(SCTP_CAUSE_OUT_OF_RESC); 4058 phdr->param_length = 4059 htons(sizeof(struct sctp_paramhdr)); 4060 } 4061 sctp_abort_association(inp, stcb, m, 4062 iphlen, sh, oper); 4063 } 4064 *offset = length; 4065 return (NULL); 4066 } 4067 } 4068 process_cookie_anyway: 4069 { 4070 struct mbuf *ret_buf; 4071 struct sctp_inpcb *linp; 4072 4073 if (stcb) 4074 linp = NULL; 4075 else 4076 linp = inp; 4077 4078 if (linp) 4079 SCTP_ASOC_CREATE_LOCK(linp); 4080 ret_buf = 4081 sctp_handle_cookie_echo(m, iphlen, 4082 *offset, sh, 4083 (struct sctp_cookie_echo_chunk *)ch, 4084 &inp, &stcb, netp, 4085 auth_skipped, 4086 auth_offset, 4087 auth_len, 4088 &locked_tcb); 4089 if (linp) 4090 SCTP_ASOC_CREATE_UNLOCK(linp); 4091 if (ret_buf == NULL) { 4092 if (locked_tcb) { 4093 SCTP_TCB_UNLOCK(locked_tcb); 4094 } 4095 #ifdef SCTP_DEBUG 4096 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4097 printf("GAK, null buffer\n"); 4098 } 4099 #endif /* SCTP_DEBUG */ 4100 auth_skipped = 0; 4101 *offset = length; 4102 return (NULL); 4103 } 4104 /* if AUTH skipped, see if it verified... */ 4105 if (auth_skipped) { 4106 got_auth = 1; 4107 auth_skipped = 0; 4108 } 4109 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4110 /* 4111 * Restart the timer if we have 4112 * pending data 4113 */ 4114 struct sctp_tmit_chunk *chk; 4115 4116 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4117 if (chk) { 4118 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4119 stcb->sctp_ep, stcb, 4120 chk->whoTo); 4121 } 4122 } 4123 } 4124 break; 4125 case SCTP_COOKIE_ACK: 4126 #ifdef SCTP_DEBUG 4127 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4128 printf("SCTP_COOKIE-ACK\n"); 4129 } 4130 #endif /* SCTP_DEBUG */ 4131 4132 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4133 /* We are not interested anymore */ 4134 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4135 ; 4136 } else { 4137 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4138 *offset = length; 4139 return (NULL); 4140 } 4141 } 4142 /* He's alive so give him credit */ 4143 stcb->asoc.overall_error_count = 0; 4144 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4145 break; 4146 case SCTP_ECN_ECHO: 4147 #ifdef SCTP_DEBUG 4148 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4149 printf("SCTP_ECN-ECHO\n"); 4150 } 4151 #endif /* SCTP_DEBUG */ 4152 /* He's alive so give him credit */ 4153 stcb->asoc.overall_error_count = 0; 4154 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 4155 stcb); 4156 break; 4157 case SCTP_ECN_CWR: 4158 #ifdef SCTP_DEBUG 4159 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4160 printf("SCTP_ECN-CWR\n"); 4161 } 4162 #endif /* SCTP_DEBUG */ 4163 /* He's alive so give him credit */ 4164 stcb->asoc.overall_error_count = 0; 4165 4166 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 4167 break; 4168 case SCTP_SHUTDOWN_COMPLETE: 4169 #ifdef SCTP_DEBUG 4170 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4171 printf("SCTP_SHUTDOWN-COMPLETE\n"); 4172 } 4173 #endif /* SCTP_DEBUG */ 4174 /* must be first and only chunk */ 4175 if ((num_chunks > 1) || 4176 (length - *offset > SCTP_SIZE32(chk_length))) { 4177 *offset = length; 4178 if (locked_tcb) 4179 SCTP_TCB_UNLOCK(locked_tcb); 4180 4181 return (NULL); 4182 } 4183 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 4184 stcb, *netp); 4185 *offset = length; 4186 return (NULL); 4187 break; 4188 case SCTP_ASCONF: 4189 #ifdef SCTP_DEBUG 4190 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4191 printf("SCTP_ASCONF\n"); 4192 } 4193 #endif /* SCTP_DEBUG */ 4194 /* He's alive so give him credit */ 4195 stcb->asoc.overall_error_count = 0; 4196 4197 sctp_handle_asconf(m, *offset, 4198 (struct sctp_asconf_chunk *)ch, stcb); 4199 break; 4200 case SCTP_ASCONF_ACK: 4201 #ifdef SCTP_DEBUG 4202 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4203 printf("SCTP_ASCONF-ACK\n"); 4204 } 4205 #endif /* SCTP_DEBUG */ 4206 /* He's alive so give him credit */ 4207 stcb->asoc.overall_error_count = 0; 4208 4209 sctp_handle_asconf_ack(m, *offset, 4210 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp); 4211 break; 4212 case SCTP_FORWARD_CUM_TSN: 4213 #ifdef SCTP_DEBUG 4214 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4215 printf("SCTP_FWD-TSN\n"); 4216 } 4217 #endif /* SCTP_DEBUG */ 4218 /* He's alive so give him credit */ 4219 { 4220 int abort_flag = 0; 4221 4222 stcb->asoc.overall_error_count = 0; 4223 *fwd_tsn_seen = 1; 4224 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4225 /* We are not interested anymore */ 4226 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 4227 *offset = length; 4228 return (NULL); 4229 } 4230 sctp_handle_forward_tsn(stcb, 4231 (struct sctp_forward_tsn_chunk *)ch, &abort_flag); 4232 if (abort_flag) { 4233 *offset = length; 4234 return (NULL); 4235 } else { 4236 stcb->asoc.overall_error_count = 0; 4237 } 4238 4239 } 4240 break; 4241 case SCTP_STREAM_RESET: 4242 #ifdef SCTP_DEBUG 4243 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4244 printf("SCTP_STREAM_RESET\n"); 4245 } 4246 #endif /* SCTP_DEBUG */ 4247 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4248 chk_length, chunk_buf); 4249 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4250 /* We are not interested anymore */ 4251 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4252 *offset = length; 4253 return (NULL); 4254 } 4255 if (stcb->asoc.peer_supports_strreset == 0) { 4256 /* 4257 * hmm, peer should have announced this, but 4258 * we will turn it on since he is sending us 4259 * a stream reset. 4260 */ 4261 stcb->asoc.peer_supports_strreset = 1; 4262 } 4263 if (sctp_handle_stream_reset(stcb, (struct sctp_stream_reset_out_req *)ch)) { 4264 /* stop processing */ 4265 *offset = length; 4266 return (NULL); 4267 } 4268 break; 4269 case SCTP_PACKET_DROPPED: 4270 #ifdef SCTP_DEBUG 4271 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4272 printf("SCTP_PACKET_DROPPED\n"); 4273 } 4274 #endif /* SCTP_DEBUG */ 4275 /* re-get it all please */ 4276 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4277 chk_length, chunk_buf); 4278 4279 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 4280 stcb, *netp); 4281 4282 break; 4283 4284 case SCTP_AUTHENTICATION: 4285 #ifdef SCTP_DEBUG 4286 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4287 printf("SCTP_AUTHENTICATION\n"); 4288 } 4289 #endif /* SCTP_DEBUG */ 4290 if (sctp_auth_disable) 4291 goto unknown_chunk; 4292 4293 if (stcb == NULL) { 4294 /* save the first AUTH for later processing */ 4295 if (auth_skipped == 0) { 4296 auth_offset = *offset; 4297 auth_len = chk_length; 4298 auth_skipped = 1; 4299 } 4300 /* skip this chunk (temporarily) */ 4301 goto next_chunk; 4302 } 4303 if (got_auth == 1) { 4304 /* skip this chunk... it's already auth'd */ 4305 goto next_chunk; 4306 } 4307 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4308 chk_length, chunk_buf); 4309 got_auth = 1; 4310 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 4311 m, *offset)) { 4312 /* auth HMAC failed so dump the packet */ 4313 *offset = length; 4314 return (stcb); 4315 } else { 4316 /* remaining chunks are HMAC checked */ 4317 stcb->asoc.authenticated = 1; 4318 } 4319 break; 4320 4321 default: 4322 unknown_chunk: 4323 /* it's an unknown chunk! */ 4324 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 4325 struct mbuf *mm; 4326 struct sctp_paramhdr *phd; 4327 4328 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4329 0, M_DONTWAIT, 1, MT_DATA); 4330 if (mm) { 4331 phd = mtod(mm, struct sctp_paramhdr *); 4332 /* 4333 * We cheat and use param type since 4334 * we did not bother to define a 4335 * error cause struct. They are the 4336 * same basic format with different 4337 * names. 4338 */ 4339 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 4340 phd->param_length = htons(chk_length + sizeof(*phd)); 4341 SCTP_BUF_LEN(mm) = sizeof(*phd); 4342 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 4343 M_DONTWAIT); 4344 if (SCTP_BUF_NEXT(mm)) { 4345 sctp_queue_op_err(stcb, mm); 4346 } else { 4347 sctp_m_freem(mm); 4348 } 4349 } 4350 } 4351 if ((ch->chunk_type & 0x80) == 0) { 4352 /* discard this packet */ 4353 *offset = length; 4354 return (stcb); 4355 } /* else skip this bad chunk and continue... */ 4356 break; 4357 } /* switch (ch->chunk_type) */ 4358 4359 4360 next_chunk: 4361 /* get the next chunk */ 4362 *offset += SCTP_SIZE32(chk_length); 4363 if (*offset >= length) { 4364 /* no more data left in the mbuf chain */ 4365 break; 4366 } 4367 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4368 sizeof(struct sctp_chunkhdr), chunk_buf); 4369 if (ch == NULL) { 4370 if (locked_tcb) 4371 SCTP_TCB_UNLOCK(locked_tcb); 4372 *offset = length; 4373 return (NULL); 4374 } 4375 } /* while */ 4376 return (stcb); 4377 } 4378 4379 4380 /* 4381 * Process the ECN bits we have something set so we must look to see if it is 4382 * ECN(0) or ECN(1) or CE 4383 */ 4384 static __inline void 4385 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 4386 uint8_t ecn_bits) 4387 { 4388 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4389 ; 4390 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 4391 /* 4392 * we only add to the nonce sum for ECT1, ECT0 does not 4393 * change the NS bit (that we have yet to find a way to send 4394 * it yet). 4395 */ 4396 4397 /* ECN Nonce stuff */ 4398 stcb->asoc.receiver_nonce_sum++; 4399 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 4400 4401 /* 4402 * Drag up the last_echo point if cumack is larger since we 4403 * don't want the point falling way behind by more than 4404 * 2^^31 and then having it be incorrect. 4405 */ 4406 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4407 stcb->asoc.last_echo_tsn, MAX_TSN)) { 4408 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4409 } 4410 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 4411 /* 4412 * Drag up the last_echo point if cumack is larger since we 4413 * don't want the point falling way behind by more than 4414 * 2^^31 and then having it be incorrect. 4415 */ 4416 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4417 stcb->asoc.last_echo_tsn, MAX_TSN)) { 4418 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4419 } 4420 } 4421 } 4422 4423 static __inline void 4424 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 4425 uint32_t high_tsn, uint8_t ecn_bits) 4426 { 4427 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4428 /* 4429 * we possibly must notify the sender that a congestion 4430 * window reduction is in order. We do this by adding a ECNE 4431 * chunk to the output chunk queue. The incoming CWR will 4432 * remove this chunk. 4433 */ 4434 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 4435 MAX_TSN)) { 4436 /* Yep, we need to add a ECNE */ 4437 sctp_send_ecn_echo(stcb, net, high_tsn); 4438 stcb->asoc.last_echo_tsn = high_tsn; 4439 } 4440 } 4441 } 4442 4443 /* 4444 * common input chunk processing (v4 and v6) 4445 */ 4446 int 4447 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 4448 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 4449 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 4450 uint8_t ecn_bits) 4451 { 4452 /* 4453 * Control chunk processing 4454 */ 4455 uint32_t high_tsn; 4456 int fwd_tsn_seen = 0, data_processed = 0; 4457 struct mbuf *m = *mm; 4458 int abort_flag = 0; 4459 int un_sent; 4460 4461 SCTP_STAT_INCR(sctps_recvdatagrams); 4462 #ifdef SCTP_AUDITING_ENABLED 4463 sctp_audit_log(0xE0, 1); 4464 sctp_auditing(0, inp, stcb, net); 4465 #endif 4466 4467 #ifdef SCTP_DEBUG 4468 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4469 printf("Ok, Common input processing called, m:%p iphlen:%d offset:%d\n", 4470 m, iphlen, offset); 4471 } 4472 #endif /* SCTP_DEBUG */ 4473 4474 if (stcb) { 4475 /* always clear this before beginning a packet */ 4476 stcb->asoc.authenticated = 0; 4477 stcb->asoc.seen_a_sack_this_pkt = 0; 4478 } 4479 if (IS_SCTP_CONTROL(ch)) { 4480 /* process the control portion of the SCTP packet */ 4481 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 4482 inp, stcb, &net, &fwd_tsn_seen); 4483 if (stcb) { 4484 /* 4485 * This covers us if the cookie-echo was there and 4486 * it changes our INP. 4487 */ 4488 inp = stcb->sctp_ep; 4489 } 4490 } else { 4491 /* 4492 * no control chunks, so pre-process DATA chunks (these 4493 * checks are taken care of by control processing) 4494 */ 4495 4496 /* 4497 * if DATA only packet, and auth is required, then punt... 4498 * can't have authenticated without any AUTH (control) 4499 * chunks 4500 */ 4501 if ((stcb != NULL) && !sctp_auth_disable && 4502 sctp_auth_is_required_chunk(SCTP_DATA, 4503 stcb->asoc.local_auth_chunks)) { 4504 /* "silently" ignore */ 4505 SCTP_STAT_INCR(sctps_recvauthmissing); 4506 SCTP_TCB_UNLOCK(stcb); 4507 return (1); 4508 } 4509 if (stcb == NULL) { 4510 /* out of the blue DATA chunk */ 4511 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL); 4512 return (1); 4513 } 4514 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 4515 /* v_tag mismatch! */ 4516 SCTP_STAT_INCR(sctps_badvtag); 4517 SCTP_TCB_UNLOCK(stcb); 4518 return (1); 4519 } 4520 } 4521 4522 if (stcb == NULL) { 4523 /* 4524 * no valid TCB for this packet, or we found it's a bad 4525 * packet while processing control, or we're done with this 4526 * packet (done or skip rest of data), so we drop it... 4527 */ 4528 return (1); 4529 } 4530 /* 4531 * DATA chunk processing 4532 */ 4533 /* plow through the data chunks while length > offset */ 4534 4535 /* 4536 * Rest should be DATA only. Check authentication state if AUTH for 4537 * DATA is required. 4538 */ 4539 if ((length > offset) && (stcb != NULL) && !sctp_auth_disable && 4540 sctp_auth_is_required_chunk(SCTP_DATA, 4541 stcb->asoc.local_auth_chunks) && 4542 !stcb->asoc.authenticated) { 4543 /* "silently" ignore */ 4544 SCTP_STAT_INCR(sctps_recvauthmissing); 4545 #ifdef SCTP_DEBUG 4546 if (sctp_debug_on & SCTP_DEBUG_AUTH1) 4547 printf("Data chunk requires AUTH, skipped\n"); 4548 #endif 4549 goto trigger_send; 4550 } 4551 if (length > offset) { 4552 int retval; 4553 4554 /* 4555 * First check to make sure our state is correct. We would 4556 * not get here unless we really did have a tag, so we don't 4557 * abort if this happens, just dump the chunk silently. 4558 */ 4559 switch (SCTP_GET_STATE(&stcb->asoc)) { 4560 case SCTP_STATE_COOKIE_ECHOED: 4561 /* 4562 * we consider data with valid tags in this state 4563 * shows us the cookie-ack was lost. Imply it was 4564 * there. 4565 */ 4566 stcb->asoc.overall_error_count = 0; 4567 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 4568 break; 4569 case SCTP_STATE_COOKIE_WAIT: 4570 /* 4571 * We consider OOTB any data sent during asoc setup. 4572 */ 4573 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL); 4574 SCTP_TCB_UNLOCK(stcb); 4575 return (1); 4576 break; 4577 case SCTP_STATE_EMPTY: /* should not happen */ 4578 case SCTP_STATE_INUSE: /* should not happen */ 4579 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 4580 case SCTP_STATE_SHUTDOWN_ACK_SENT: 4581 default: 4582 SCTP_TCB_UNLOCK(stcb); 4583 return (1); 4584 break; 4585 case SCTP_STATE_OPEN: 4586 case SCTP_STATE_SHUTDOWN_SENT: 4587 break; 4588 } 4589 /* take care of ECN, part 1. */ 4590 if (stcb->asoc.ecn_allowed && 4591 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4592 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 4593 } 4594 /* plow through the data chunks while length > offset */ 4595 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 4596 inp, stcb, net, &high_tsn); 4597 if (retval == 2) { 4598 /* 4599 * The association aborted, NO UNLOCK needed since 4600 * the association is destroyed. 4601 */ 4602 return (0); 4603 } 4604 data_processed = 1; 4605 if (retval == 0) { 4606 /* take care of ecn part 2. */ 4607 if (stcb->asoc.ecn_allowed && 4608 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4609 sctp_process_ecn_marked_b(stcb, net, high_tsn, 4610 ecn_bits); 4611 } 4612 } 4613 /* 4614 * Anything important needs to have been m_copy'ed in 4615 * process_data 4616 */ 4617 } 4618 if ((data_processed == 0) && (fwd_tsn_seen)) { 4619 int was_a_gap = 0; 4620 4621 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 4622 stcb->asoc.cumulative_tsn, MAX_TSN)) { 4623 /* there was a gap before this data was processed */ 4624 was_a_gap = 1; 4625 } 4626 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 4627 if (abort_flag) { 4628 /* Again, we aborted so NO UNLOCK needed */ 4629 return (0); 4630 } 4631 } 4632 /* trigger send of any chunks in queue... */ 4633 trigger_send: 4634 #ifdef SCTP_AUDITING_ENABLED 4635 sctp_audit_log(0xE0, 2); 4636 sctp_auditing(1, inp, stcb, net); 4637 #endif 4638 #ifdef SCTP_DEBUG 4639 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4640 printf("Check for chunk output prw:%d tqe:%d tf=%d\n", 4641 stcb->asoc.peers_rwnd, 4642 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 4643 stcb->asoc.total_flight); 4644 } 4645 #endif 4646 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 4647 4648 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 4649 ((un_sent) && 4650 (stcb->asoc.peers_rwnd > 0 || 4651 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 4652 #ifdef SCTP_DEBUG 4653 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4654 printf("Calling chunk OUTPUT\n"); 4655 } 4656 #endif 4657 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 4658 #ifdef SCTP_DEBUG 4659 if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4660 printf("chunk OUTPUT returns\n"); 4661 } 4662 #endif 4663 } 4664 #ifdef SCTP_AUDITING_ENABLED 4665 sctp_audit_log(0xE0, 3); 4666 sctp_auditing(2, inp, stcb, net); 4667 #endif 4668 SCTP_TCB_UNLOCK(stcb); 4669 return (0); 4670 } 4671 4672 4673 4674 void 4675 sctp_input(i_pak, off) 4676 struct mbuf *i_pak; 4677 int off; 4678 4679 { 4680 #ifdef SCTP_MBUF_LOGGING 4681 struct mbuf *mat; 4682 4683 #endif 4684 struct mbuf *m; 4685 int iphlen; 4686 uint8_t ecn_bits; 4687 struct ip *ip; 4688 struct sctphdr *sh; 4689 struct sctp_inpcb *inp = NULL; 4690 4691 uint32_t check, calc_check; 4692 struct sctp_nets *net; 4693 struct sctp_tcb *stcb = NULL; 4694 struct sctp_chunkhdr *ch; 4695 int refcount_up = 0; 4696 int length, mlen, offset; 4697 4698 4699 iphlen = off; 4700 m = SCTP_HEADER_TO_CHAIN(i_pak); 4701 net = NULL; 4702 SCTP_STAT_INCR(sctps_recvpackets); 4703 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 4704 4705 /* 4706 * Strip IP options, we don't allow any in or out. 4707 */ 4708 #ifdef SCTP_MBUF_LOGGING 4709 /* Log in any input mbufs */ 4710 mat = m; 4711 while (mat) { 4712 if (SCTP_BUF_IS_EXTENDED(mat)) { 4713 sctp_log_mb(mat, SCTP_MBUF_INPUT); 4714 } 4715 mat = SCTP_BUF_NEXT(mat); 4716 } 4717 #endif 4718 if ((size_t)iphlen > sizeof(struct ip)) { 4719 ip_stripoptions(m, (struct mbuf *)0); 4720 iphlen = sizeof(struct ip); 4721 } 4722 /* 4723 * Get IP, SCTP, and first chunk header together in first mbuf. 4724 */ 4725 ip = mtod(m, struct ip *); 4726 offset = iphlen + sizeof(*sh) + sizeof(*ch); 4727 if (SCTP_BUF_LEN(m) < offset) { 4728 if ((m = m_pullup(m, offset)) == 0) { 4729 SCTP_STAT_INCR(sctps_hdrops); 4730 return; 4731 } 4732 ip = mtod(m, struct ip *); 4733 } 4734 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 4735 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 4736 4737 /* SCTP does not allow broadcasts or multicasts */ 4738 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 4739 goto bad; 4740 } 4741 if (((ch->chunk_type == SCTP_INITIATION) || 4742 (ch->chunk_type == SCTP_INITIATION_ACK) || 4743 (ch->chunk_type == SCTP_COOKIE_ECHO)) && 4744 (SCTP_IS_IT_BROADCAST(ip->ip_dst, i_pak))) { 4745 /* 4746 * We only look at broadcast if its a front state, All 4747 * others we will not have a tcb for anyway. 4748 */ 4749 goto bad; 4750 } 4751 /* destination port of 0 is illegal, based on RFC2960. */ 4752 if (sh->dest_port == 0) { 4753 SCTP_STAT_INCR(sctps_hdrops); 4754 goto bad; 4755 } 4756 /* validate SCTP checksum */ 4757 if ((sctp_no_csum_on_loopback == 0) || !SCTP_IS_IT_LOOPBACK(i_pak)) { 4758 /* 4759 * we do NOT validate things from the loopback if the sysctl 4760 * is set to 1. 4761 */ 4762 check = sh->checksum; /* save incoming checksum */ 4763 if ((check == 0) && (sctp_no_csum_on_loopback)) { 4764 /* 4765 * special hook for where we got a local address 4766 * somehow routed across a non IFT_LOOP type 4767 * interface 4768 */ 4769 if (ip->ip_src.s_addr == ip->ip_dst.s_addr) 4770 goto sctp_skip_csum_4; 4771 } 4772 sh->checksum = 0; /* prepare for calc */ 4773 calc_check = sctp_calculate_sum(m, &mlen, iphlen); 4774 if (calc_check != check) { 4775 #ifdef SCTP_DEBUG 4776 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4777 printf("Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 4778 calc_check, check, m, mlen, iphlen); 4779 } 4780 #endif 4781 4782 stcb = sctp_findassociation_addr(m, iphlen, 4783 offset - sizeof(*ch), 4784 sh, ch, &inp, &net); 4785 if ((inp) && (stcb)) { 4786 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 4787 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR); 4788 } else if ((inp != NULL) && (stcb == NULL)) { 4789 refcount_up = 1; 4790 } 4791 SCTP_STAT_INCR(sctps_badsum); 4792 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 4793 goto bad; 4794 } 4795 sh->checksum = calc_check; 4796 } else { 4797 sctp_skip_csum_4: 4798 mlen = SCTP_HEADER_LEN(i_pak); 4799 } 4800 /* validate mbuf chain length with IP payload length */ 4801 if (mlen < (ip->ip_len - iphlen)) { 4802 SCTP_STAT_INCR(sctps_hdrops); 4803 goto bad; 4804 } 4805 /* 4806 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 4807 * IP/SCTP/first chunk header... 4808 */ 4809 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 4810 sh, ch, &inp, &net); 4811 /* inp's ref-count increased && stcb locked */ 4812 if (inp == NULL) { 4813 struct sctp_init_chunk *init_chk, chunk_buf; 4814 4815 SCTP_STAT_INCR(sctps_noport); 4816 #ifdef ICMP_BANDLIM 4817 /* 4818 * we use the bandwidth limiting to protect against sending 4819 * too many ABORTS all at once. In this case these count the 4820 * same as an ICMP message. 4821 */ 4822 if (badport_bandlim(0) < 0) 4823 goto bad; 4824 #endif /* ICMP_BANDLIM */ 4825 #ifdef SCTP_DEBUG 4826 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4827 printf("Sending a ABORT from packet entry!\n"); 4828 } 4829 #endif 4830 if (ch->chunk_type == SCTP_INITIATION) { 4831 /* 4832 * we do a trick here to get the INIT tag, dig in 4833 * and get the tag from the INIT and put it in the 4834 * common header. 4835 */ 4836 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 4837 iphlen + sizeof(*sh), sizeof(*init_chk), 4838 (uint8_t *) & chunk_buf); 4839 if (init_chk != NULL) 4840 sh->v_tag = init_chk->init.initiate_tag; 4841 } 4842 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4843 sctp_send_shutdown_complete2(m, iphlen, sh); 4844 goto bad; 4845 } 4846 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 4847 goto bad; 4848 } 4849 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 4850 sctp_send_abort(m, iphlen, sh, 0, NULL); 4851 goto bad; 4852 } else if (stcb == NULL) { 4853 refcount_up = 1; 4854 } 4855 #ifdef IPSEC 4856 /* 4857 * I very much doubt any of the IPSEC stuff will work but I have no 4858 * idea, so I will leave it in place. 4859 */ 4860 4861 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 4862 ipsecstat.in_polvio++; 4863 SCTP_STAT_INCR(sctps_hdrops); 4864 goto bad; 4865 } 4866 #endif /* IPSEC */ 4867 4868 4869 4870 /* 4871 * common chunk processing 4872 */ 4873 length = ip->ip_len + iphlen; 4874 offset -= sizeof(struct sctp_chunkhdr); 4875 4876 ecn_bits = ip->ip_tos; 4877 4878 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 4879 inp, stcb, net, ecn_bits); 4880 /* inp's ref-count reduced && stcb unlocked */ 4881 if (m) { 4882 sctp_m_freem(m); 4883 } 4884 if ((inp) && (refcount_up)) { 4885 /* reduce ref-count */ 4886 SCTP_INP_WLOCK(inp); 4887 SCTP_INP_DECR_REF(inp); 4888 SCTP_INP_WUNLOCK(inp); 4889 } 4890 return; 4891 bad: 4892 if (stcb) 4893 SCTP_TCB_UNLOCK(stcb); 4894 4895 if ((inp) && (refcount_up)) { 4896 /* reduce ref-count */ 4897 SCTP_INP_WLOCK(inp); 4898 SCTP_INP_DECR_REF(inp); 4899 SCTP_INP_WUNLOCK(inp); 4900 } 4901 if (m) { 4902 sctp_m_freem(m); 4903 } 4904 return; 4905 } 4906