sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $   */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/udp.h>
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
  86     struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  87     int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
  88 {
  89         struct sctp_init *init;
  90         struct mbuf *op_err;
  91
  92         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  93             stcb);
  94         if (stcb == NULL) {
  95                 SCTP_INP_RLOCK(inp);
  96         }
  97         /* validate length */
  98         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
  99                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 100                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 101                     vrf_id, port);
 102                 if (stcb)
 103                         *abort_no_unlock = 1;
 104                 goto outnow;
 105         }
 106         /* validate parameters */
 107         init = &cp->init;
 108         if (init->initiate_tag == 0) {
 109                 /* protocol error... send abort */
 110                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 111                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 112                     vrf_id, port);
 113                 if (stcb)
 114                         *abort_no_unlock = 1;
 115                 goto outnow;
 116         }
 117         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 118                 /* invalid parameter... send abort */
 119                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 120                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 121                     vrf_id, port);
 122                 if (stcb)
 123                         *abort_no_unlock = 1;
 124                 goto outnow;
 125         }
 126         if (init->num_inbound_streams == 0) {
 127                 /* protocol error... send abort */
 128                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 129                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 130                     vrf_id, port);
 131                 if (stcb)
 132                         *abort_no_unlock = 1;
 133                 goto outnow;
 134         }
 135         if (init->num_outbound_streams == 0) {
 136                 /* protocol error... send abort */
 137                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 138                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 139                     vrf_id, port);
 140                 if (stcb)
 141                         *abort_no_unlock = 1;
 142                 goto outnow;
 143         }
 144         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 145             offset + ntohs(cp->ch.chunk_length))) {
 146                 /* auth parameter(s) error... send abort */
 147                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         /*
 153          * We are only accepting if we have a socket with positive
 154          * so_qlimit.
 155          */
 156         if ((stcb == NULL) &&
 157             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 158             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 159             (inp->sctp_socket == NULL) ||
 160             (inp->sctp_socket->so_qlimit == 0))) {
 161                 /*
 162                  * FIX ME ?? What about TCP model and we have a
 163                  * match/restart case? Actually no fix is needed. the lookup
 164                  * will always find the existing assoc so stcb would not be
 165                  * NULL. It may be questionable to do this since we COULD
 166                  * just send back the INIT-ACK and hope that the app did
 167                  * accept()'s by the time the COOKIE was sent. But there is
 168                  * a price to pay for COOKIE generation and I don't want to
 169                  * pay it on the chance that the app will actually do some
 170                  * accepts(). The App just looses and should NOT be in this
 171                  * state :-)
 172                  */
 173                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 174                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 175                 }
 176                 goto outnow;
 177         }
 178         if ((stcb != NULL) &&
 179             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 180                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 181                 sctp_send_shutdown_ack(stcb, NULL);
 182                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 183         } else {
 184                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 185                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
 186                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 187         }
 188 outnow:
 189         if (stcb == NULL) {
 190                 SCTP_INP_RUNLOCK(inp);
 191         }
 192 }
 193
 194 /*
 195  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 196  */
 197
 198 int
 199 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 200 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 201     SCTP_UNUSED
 202 #endif
 203 )
 204 {
 205         int unsent_data = 0;
 206         unsigned int i;
 207         struct sctp_stream_queue_pending *sp;
 208         struct sctp_association *asoc;
 209
 210         /*
 211          * This function returns the number of streams that have true unsent
 212          * data on them. Note that as it looks through it will clean up any
 213          * places that have old data that has been sent but left at top of
 214          * stream queue.
 215          */
 216         asoc = &stcb->asoc;
 217         SCTP_TCB_SEND_LOCK(stcb);
 218         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 219                 /* Check to see if some data queued */
 220                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 221                         /* sa_ignore FREED_MEMORY */
 222                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 223                         if (sp == NULL) {
 224                                 continue;
 225                         }
 226                         if ((sp->msg_is_complete) &&
 227                             (sp->length == 0) &&
 228                             (sp->sender_all_done)) {
 229                                 /*
 230                                  * We are doing differed cleanup. Last time
 231                                  * through when we took all the data the
 232                                  * sender_all_done was not set.
 233                                  */
 234                                 if (sp->put_last_out == 0) {
 235                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 236                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 237                                             sp->sender_all_done,
 238                                             sp->length,
 239                                             sp->msg_is_complete,
 240                                             sp->put_last_out);
 241                                 }
 242                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 243                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 244                                 if (sp->net) {
 245                                         sctp_free_remote_addr(sp->net);
 246                                         sp->net = NULL;
 247                                 }
 248                                 if (sp->data) {
 249                                         sctp_m_freem(sp->data);
 250                                         sp->data = NULL;
 251                                 }
 252                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 253                         } else {
 254                                 unsent_data++;
 255                                 break;
 256                         }
 257                 }
 258         }
 259         SCTP_TCB_SEND_UNLOCK(stcb);
 260         return (unsent_data);
 261 }
 262
 263 static int
 264 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 265 {
 266         struct sctp_init *init;
 267         struct sctp_association *asoc;
 268         struct sctp_nets *lnet;
 269         unsigned int i;
 270
 271         init = &cp->init;
 272         asoc = &stcb->asoc;
 273         /* save off parameters */
 274         asoc->peer_vtag = ntohl(init->initiate_tag);
 275         asoc->peers_rwnd = ntohl(init->a_rwnd);
 276         /* init tsn's */
 277         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 278
 279         if (!TAILQ_EMPTY(&asoc->nets)) {
 280                 /* update any ssthresh's that may have a default */
 281                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 282                         lnet->ssthresh = asoc->peers_rwnd;
 283                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 284                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 285                         }
 286                 }
 287         }
 288         SCTP_TCB_SEND_LOCK(stcb);
 289         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 290                 unsigned int newcnt;
 291                 struct sctp_stream_out *outs;
 292                 struct sctp_stream_queue_pending *sp, *nsp;
 293                 struct sctp_tmit_chunk *chk, *nchk;
 294
 295                 /* abandon the upper streams */
 296                 newcnt = ntohs(init->num_inbound_streams);
 297                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 298                         if (chk->rec.data.stream_number >= newcnt) {
 299                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 300                                 asoc->send_queue_cnt--;
 301                                 if (chk->data != NULL) {
 302                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 303                                         sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
 304                                             SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED);
 305                                         if (chk->data) {
 306                                                 sctp_m_freem(chk->data);
 307                                                 chk->data = NULL;
 308                                         }
 309                                 }
 310                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 311                                 /* sa_ignore FREED_MEMORY */
 312                         }
 313                 }
 314                 if (asoc->strmout) {
 315                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 316                                 outs = &asoc->strmout[i];
 317                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 318                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 319                                         asoc->stream_queue_cnt--;
 320                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 321                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
 322                                             sp, SCTP_SO_NOT_LOCKED);
 323                                         if (sp->data) {
 324                                                 sctp_m_freem(sp->data);
 325                                                 sp->data = NULL;
 326                                         }
 327                                         if (sp->net) {
 328                                                 sctp_free_remote_addr(sp->net);
 329                                                 sp->net = NULL;
 330                                         }
 331                                         /* Free the chunk */
 332                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 333                                         /* sa_ignore FREED_MEMORY */
 334                                 }
 335                         }
 336                 }
 337                 /* cut back the count */
 338                 asoc->pre_open_streams = newcnt;
 339         }
 340         SCTP_TCB_SEND_UNLOCK(stcb);
 341         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 342
 343         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 344         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 345         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 346                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 347         }
 348         /* This is the next one we expect */
 349         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 350
 351         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 352         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 353
 354         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 355         /* open the requested streams */
 356
 357         if (asoc->strmin != NULL) {
 358                 /* Free the old ones */
 359                 struct sctp_queued_to_read *ctl, *nctl;
 360
 361                 for (i = 0; i < asoc->streamincnt; i++) {
 362                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 363                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 364                                 sctp_free_remote_addr(ctl->whoFrom);
 365                                 ctl->whoFrom = NULL;
 366                                 sctp_m_freem(ctl->data);
 367                                 ctl->data = NULL;
 368                                 sctp_free_a_readq(stcb, ctl);
 369                         }
 370                 }
 371                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 372         }
 373         asoc->streamincnt = ntohs(init->num_outbound_streams);
 374         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 375                 asoc->streamincnt = MAX_SCTP_STREAMS;
 376         }
 377         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 378             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 379         if (asoc->strmin == NULL) {
 380                 /* we didn't get memory for the streams! */
 381                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 382                 return (-1);
 383         }
 384         for (i = 0; i < asoc->streamincnt; i++) {
 385                 asoc->strmin[i].stream_no = i;
 386                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 387                 /*
 388                  * U-stream ranges will be set when the cookie is unpacked.
 389                  * Or for the INIT sender they are un set (if pr-sctp not
 390                  * supported) when the INIT-ACK arrives.
 391                  */
 392                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 393                 asoc->strmin[i].delivery_started = 0;
 394         }
 395         /*
 396          * load_address_from_init will put the addresses into the
 397          * association when the COOKIE is processed or the INIT-ACK is
 398          * processed. Both types of COOKIE's existing and new call this
 399          * routine. It will remove addresses that are no longer in the
 400          * association (for the restarting case where addresses are
 401          * removed). Up front when the INIT arrives we will discard it if it
 402          * is a restart and new addresses have been added.
 403          */
 404         /* sa_ignore MEMLEAK */
 405         return (0);
 406 }
 407
 408 /*
 409  * INIT-ACK message processing/consumption returns value < 0 on error
 410  */
 411 static int
 412 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 413     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 414     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 415 {
 416         struct sctp_association *asoc;
 417         struct mbuf *op_err;
 418         int retval, abort_flag;
 419         uint32_t initack_limit;
 420         int nat_friendly = 0;
 421
 422         /* First verify that we have no illegal param's */
 423         abort_flag = 0;
 424         op_err = NULL;
 425
 426         op_err = sctp_arethere_unrecognized_parameters(m,
 427             (offset + sizeof(struct sctp_init_chunk)),
 428             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 429         if (abort_flag) {
 430                 /* Send an abort and notify peer */
 431                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
 432                 *abort_no_unlock = 1;
 433                 return (-1);
 434         }
 435         asoc = &stcb->asoc;
 436         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 437         /* process the peer's parameters in the INIT-ACK */
 438         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 439         if (retval < 0) {
 440                 return (retval);
 441         }
 442         initack_limit = offset + ntohs(cp->ch.chunk_length);
 443         /* load all addresses */
 444         if ((retval = sctp_load_addresses_from_init(stcb, m,
 445             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 446             NULL))) {
 447                 /* Huh, we should abort */
 448                 SCTPDBG(SCTP_DEBUG_INPUT1,
 449                     "Load addresses from INIT causes an abort %d\n",
 450                     retval);
 451                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 452                     NULL, 0, net->port);
 453                 *abort_no_unlock = 1;
 454                 return (-1);
 455         }
 456         /* if the peer doesn't support asconf, flush the asconf queue */
 457         if (asoc->peer_supports_asconf == 0) {
 458                 struct sctp_asconf_addr *param, *nparam;
 459
 460                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 461                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 462                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 463                 }
 464         }
 465         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 466             stcb->asoc.local_hmacs);
 467         if (op_err) {
 468                 sctp_queue_op_err(stcb, op_err);
 469                 /* queuing will steal away the mbuf chain to the out queue */
 470                 op_err = NULL;
 471         }
 472         /* extract the cookie and queue it to "echo" it back... */
 473         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 474                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 475                     stcb->asoc.overall_error_count,
 476                     0,
 477                     SCTP_FROM_SCTP_INPUT,
 478                     __LINE__);
 479         }
 480         stcb->asoc.overall_error_count = 0;
 481         net->error_count = 0;
 482
 483         /*
 484          * Cancel the INIT timer, We do this first before queueing the
 485          * cookie. We always cancel at the primary to assue that we are
 486          * canceling the timer started by the INIT which always goes to the
 487          * primary.
 488          */
 489         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 490             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 491
 492         /* calculate the RTO */
 493         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 494             SCTP_RTT_FROM_NON_DATA);
 495
 496         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 497         if (retval < 0) {
 498                 /*
 499                  * No cookie, we probably should send a op error. But in any
 500                  * case if there is no cookie in the INIT-ACK, we can
 501                  * abandon the peer, its broke.
 502                  */
 503                 if (retval == -3) {
 504                         /* We abort with an error of missing mandatory param */
 505                         op_err =
 506                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 507                         if (op_err) {
 508                                 /*
 509                                  * Expand beyond to include the mandatory
 510                                  * param cookie
 511                                  */
 512                                 struct sctp_inv_mandatory_param *mp;
 513
 514                                 SCTP_BUF_LEN(op_err) =
 515                                     sizeof(struct sctp_inv_mandatory_param);
 516                                 mp = mtod(op_err,
 517                                     struct sctp_inv_mandatory_param *);
 518                                 /* Subtract the reserved param */
 519                                 mp->length =
 520                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 521                                 mp->num_param = htonl(1);
 522                                 mp->param = htons(SCTP_STATE_COOKIE);
 523                                 mp->resv = 0;
 524                         }
 525                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 526                             sh, op_err, vrf_id, net->port);
 527                         *abort_no_unlock = 1;
 528                 }
 529                 return (retval);
 530         }
 531         return (0);
 532 }
 533
 534 static void
 535 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 536     struct sctp_tcb *stcb, struct sctp_nets *net)
 537 {
 538         struct sockaddr_storage store;
 539         struct sctp_nets *r_net, *f_net;
 540         struct timeval tv;
 541         int req_prim = 0;
 542         uint16_t old_error_counter;
 543
 544 #ifdef INET
 545         struct sockaddr_in *sin;
 546
 547 #endif
 548 #ifdef INET6
 549         struct sockaddr_in6 *sin6;
 550
 551 #endif
 552
 553         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 554                 /* Invalid length */
 555                 return;
 556         }
 557         memset(&store, 0, sizeof(store));
 558         switch (cp->heartbeat.hb_info.addr_family) {
 559 #ifdef INET
 560         case AF_INET:
 561                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 562                         sin = (struct sockaddr_in *)&store;
 563                         sin->sin_family = cp->heartbeat.hb_info.addr_family;
 564                         sin->sin_len = cp->heartbeat.hb_info.addr_len;
 565                         sin->sin_port = stcb->rport;
 566                         memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 567                             sizeof(sin->sin_addr));
 568                 } else {
 569                         return;
 570                 }
 571                 break;
 572 #endif
 573 #ifdef INET6
 574         case AF_INET6:
 575                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 576                         sin6 = (struct sockaddr_in6 *)&store;
 577                         sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 578                         sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 579                         sin6->sin6_port = stcb->rport;
 580                         memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 581                             sizeof(sin6->sin6_addr));
 582                 } else {
 583                         return;
 584                 }
 585                 break;
 586 #endif
 587         default:
 588                 return;
 589         }
 590         r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
 591         if (r_net == NULL) {
 592                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 593                 return;
 594         }
 595         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 596             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 597             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 598                 /*
 599                  * If the its a HB and it's random value is correct when can
 600                  * confirm the destination.
 601                  */
 602                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 603                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 604                         stcb->asoc.primary_destination = r_net;
 605                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 606                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 607                         if (f_net != r_net) {
 608                                 /*
 609                                  * first one on the list is NOT the primary
 610                                  * sctp_cmpaddr() is much more efficent if
 611                                  * the primary is the first on the list,
 612                                  * make it so.
 613                                  */
 614                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 615                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 616                         }
 617                         req_prim = 1;
 618                 }
 619                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 620                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 621                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 622                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 623         }
 624         old_error_counter = r_net->error_count;
 625         r_net->error_count = 0;
 626         r_net->hb_responded = 1;
 627         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 628         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 629         /* Now lets do a RTO with this */
 630         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 631             SCTP_RTT_FROM_NON_DATA);
 632         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 633                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 634                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 635                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
 636         }
 637         if (r_net->dest_state & SCTP_ADDR_PF) {
 638                 r_net->dest_state &= ~SCTP_ADDR_PF;
 639                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 640         }
 641         if (old_error_counter > 0) {
 642                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 643                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 644         }
 645         if (r_net == stcb->asoc.primary_destination) {
 646                 if (stcb->asoc.alternate) {
 647                         /* release the alternate, primary is good */
 648                         sctp_free_remote_addr(stcb->asoc.alternate);
 649                         stcb->asoc.alternate = NULL;
 650                 }
 651         }
 652         /* Mobility adaptation */
 653         if (req_prim) {
 654                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 655                     SCTP_MOBILITY_BASE) ||
 656                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 657                     SCTP_MOBILITY_FASTHANDOFF)) &&
 658                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 659                     SCTP_MOBILITY_PRIM_DELETED)) {
 660
 661                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 662                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 663                             SCTP_MOBILITY_FASTHANDOFF)) {
 664                                 sctp_assoc_immediate_retrans(stcb,
 665                                     stcb->asoc.primary_destination);
 666                         }
 667                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 668                             SCTP_MOBILITY_BASE)) {
 669                                 sctp_move_chunks_from_net(stcb,
 670                                     stcb->asoc.deleted_primary);
 671                         }
 672                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 673                             stcb->asoc.deleted_primary);
 674                 }
 675         }
 676 }
 677
 678 static int
 679 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 680 {
 681         /*
 682          * return 0 means we want you to proceed with the abort non-zero
 683          * means no abort processing
 684          */
 685         struct sctpasochead *head;
 686
 687         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 688                 /* generate a new vtag and send init */
 689                 LIST_REMOVE(stcb, sctp_asocs);
 690                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 691                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 692                 /*
 693                  * put it in the bucket in the vtag hash of assoc's for the
 694                  * system
 695                  */
 696                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 697                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 698                 return (1);
 699         }
 700         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 701                 /*
 702                  * treat like a case where the cookie expired i.e.: - dump
 703                  * current cookie. - generate a new vtag. - resend init.
 704                  */
 705                 /* generate a new vtag and send init */
 706                 LIST_REMOVE(stcb, sctp_asocs);
 707                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 708                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 709                 sctp_stop_all_cookie_timers(stcb);
 710                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 711                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 712                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 713                 /*
 714                  * put it in the bucket in the vtag hash of assoc's for the
 715                  * system
 716                  */
 717                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 718                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 719                 return (1);
 720         }
 721         return (0);
 722 }
 723
 724 static int
 725 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 726     struct sctp_nets *net)
 727 {
 728         /*
 729          * return 0 means we want you to proceed with the abort non-zero
 730          * means no abort processing
 731          */
 732         if (stcb->asoc.peer_supports_auth == 0) {
 733                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 734                 return (0);
 735         }
 736         sctp_asconf_send_nat_state_update(stcb, net);
 737         return (1);
 738 }
 739
 740
 741 static void
 742 sctp_handle_abort(struct sctp_abort_chunk *cp,
 743     struct sctp_tcb *stcb, struct sctp_nets *net)
 744 {
 745 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 746         struct socket *so;
 747
 748 #endif
 749         uint16_t len;
 750
 751         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 752         if (stcb == NULL)
 753                 return;
 754
 755         len = ntohs(cp->ch.chunk_length);
 756         if (len > sizeof(struct sctp_chunkhdr)) {
 757                 /*
 758                  * Need to check the cause codes for our two magic nat
 759                  * aborts which don't kill the assoc necessarily.
 760                  */
 761                 struct sctp_abort_chunk *cpnext;
 762                 struct sctp_missing_nat_state *natc;
 763                 uint16_t cause;
 764
 765                 cpnext = cp;
 766                 cpnext++;
 767                 natc = (struct sctp_missing_nat_state *)cpnext;
 768                 cause = ntohs(natc->cause);
 769                 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 770                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 771                             cp->ch.chunk_flags);
 772                         if (sctp_handle_nat_colliding_state(stcb)) {
 773                                 return;
 774                         }
 775                 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
 776                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 777                             cp->ch.chunk_flags);
 778                         if (sctp_handle_nat_missing_state(stcb, net)) {
 779                                 return;
 780                         }
 781                 }
 782         }
 783         /* stop any receive timers */
 784         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 785         /* notify user of the abort and clean up... */
 786         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 787         /* free the tcb */
 788 #if defined(SCTP_PANIC_ON_ABORT)
 789         printf("stcb:%p state:%d rport:%d net:%p\n",
 790             stcb, stcb->asoc.state, stcb->rport, net);
 791         if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 792                 panic("Received an ABORT");
 793         } else {
 794                 printf("No panic its in state %x closed\n", stcb->asoc.state);
 795         }
 796 #endif
 797         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 798         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 799             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 800                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 801         }
 802 #ifdef SCTP_ASOCLOG_OF_TSNS
 803         sctp_print_out_track_log(stcb);
 804 #endif
 805 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 806         so = SCTP_INP_SO(stcb->sctp_ep);
 807         atomic_add_int(&stcb->asoc.refcnt, 1);
 808         SCTP_TCB_UNLOCK(stcb);
 809         SCTP_SOCKET_LOCK(so, 1);
 810         SCTP_TCB_LOCK(stcb);
 811         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 812 #endif
 813         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 814         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 815             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 816 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 817         SCTP_SOCKET_UNLOCK(so, 1);
 818 #endif
 819         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 820 }
 821
 822 static void
 823 sctp_start_net_timers(struct sctp_tcb *stcb)
 824 {
 825         uint32_t cnt_hb_sent;
 826         struct sctp_nets *net;
 827
 828         cnt_hb_sent = 0;
 829         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 830                 /*
 831                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 832                  * If the dest in unconfirmed send a hb as well if under
 833                  * max_hb_burst have been sent.
 834                  */
 835                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 836                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 837                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 838                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 839                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 840                         cnt_hb_sent++;
 841                 }
 842         }
 843         if (cnt_hb_sent) {
 844                 sctp_chunk_output(stcb->sctp_ep, stcb,
 845                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 846                     SCTP_SO_NOT_LOCKED);
 847         }
 848 }
 849
 850
 851 static void
 852 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 853     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 854 {
 855         struct sctp_association *asoc;
 856         int some_on_streamwheel;
 857
 858 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 859         struct socket *so;
 860
 861 #endif
 862
 863         SCTPDBG(SCTP_DEBUG_INPUT2,
 864             "sctp_handle_shutdown: handling SHUTDOWN\n");
 865         if (stcb == NULL)
 866                 return;
 867         asoc = &stcb->asoc;
 868         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 869             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 870                 return;
 871         }
 872         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 873                 /* Shutdown NOT the expected size */
 874                 return;
 875         } else {
 876                 sctp_update_acked(stcb, cp, abort_flag);
 877                 if (*abort_flag) {
 878                         return;
 879                 }
 880         }
 881         if (asoc->control_pdapi) {
 882                 /*
 883                  * With a normal shutdown we assume the end of last record.
 884                  */
 885                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 886                 asoc->control_pdapi->end_added = 1;
 887                 asoc->control_pdapi->pdapi_aborted = 1;
 888                 asoc->control_pdapi = NULL;
 889                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 890 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 891                 so = SCTP_INP_SO(stcb->sctp_ep);
 892                 atomic_add_int(&stcb->asoc.refcnt, 1);
 893                 SCTP_TCB_UNLOCK(stcb);
 894                 SCTP_SOCKET_LOCK(so, 1);
 895                 SCTP_TCB_LOCK(stcb);
 896                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 897                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 898                         /* assoc was freed while we were unlocked */
 899                         SCTP_SOCKET_UNLOCK(so, 1);
 900                         return;
 901                 }
 902 #endif
 903                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 904 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 905                 SCTP_SOCKET_UNLOCK(so, 1);
 906 #endif
 907         }
 908         /* goto SHUTDOWN_RECEIVED state to block new requests */
 909         if (stcb->sctp_socket) {
 910                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 911                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 912                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 913                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 914                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 915                         /*
 916                          * notify upper layer that peer has initiated a
 917                          * shutdown
 918                          */
 919                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 920
 921                         /* reset time */
 922                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 923                 }
 924         }
 925         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 926                 /*
 927                  * stop the shutdown timer, since we WILL move to
 928                  * SHUTDOWN-ACK-SENT.
 929                  */
 930                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 931         }
 932         /* Now is there unsent data on a stream somewhere? */
 933         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 934
 935         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 936             !TAILQ_EMPTY(&asoc->sent_queue) ||
 937             some_on_streamwheel) {
 938                 /* By returning we will push more data out */
 939                 return;
 940         } else {
 941                 /* no outstanding data to send, so move on... */
 942                 /* send SHUTDOWN-ACK */
 943                 sctp_send_shutdown_ack(stcb, net);
 944                 /* move to SHUTDOWN-ACK-SENT state */
 945                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 946                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 947                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 948                 }
 949                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 950                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 951                 sctp_stop_timers_for_shutdown(stcb);
 952                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 953                     stcb, net);
 954         }
 955 }
 956
 957 static void
 958 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 959     struct sctp_tcb *stcb,
 960     struct sctp_nets *net)
 961 {
 962         struct sctp_association *asoc;
 963
 964 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 965         struct socket *so;
 966
 967         so = SCTP_INP_SO(stcb->sctp_ep);
 968 #endif
 969         SCTPDBG(SCTP_DEBUG_INPUT2,
 970             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 971         if (stcb == NULL)
 972                 return;
 973
 974         asoc = &stcb->asoc;
 975         /* process according to association state */
 976         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 977             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 978                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 979                 sctp_send_shutdown_complete(stcb, net, 1);
 980                 SCTP_TCB_UNLOCK(stcb);
 981                 return;
 982         }
 983         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 984             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 985                 /* unexpected SHUTDOWN-ACK... so ignore... */
 986                 SCTP_TCB_UNLOCK(stcb);
 987                 return;
 988         }
 989         if (asoc->control_pdapi) {
 990                 /*
 991                  * With a normal shutdown we assume the end of last record.
 992                  */
 993                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 994                 asoc->control_pdapi->end_added = 1;
 995                 asoc->control_pdapi->pdapi_aborted = 1;
 996                 asoc->control_pdapi = NULL;
 997                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 998 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 999                 atomic_add_int(&stcb->asoc.refcnt, 1);
1000                 SCTP_TCB_UNLOCK(stcb);
1001                 SCTP_SOCKET_LOCK(so, 1);
1002                 SCTP_TCB_LOCK(stcb);
1003                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1004                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1005                         /* assoc was freed while we were unlocked */
1006                         SCTP_SOCKET_UNLOCK(so, 1);
1007                         return;
1008                 }
1009 #endif
1010                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1011 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1012                 SCTP_SOCKET_UNLOCK(so, 1);
1013 #endif
1014         }
1015         /* are the queues empty? */
1016         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1017             !TAILQ_EMPTY(&asoc->sent_queue) ||
1018             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1019                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
1020         }
1021         /* stop the timer */
1022         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1023         /* send SHUTDOWN-COMPLETE */
1024         sctp_send_shutdown_complete(stcb, net, 0);
1025         /* notify upper layer protocol */
1026         if (stcb->sctp_socket) {
1027                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1028                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1029                         stcb->sctp_socket->so_snd.sb_cc = 0;
1030                 }
1031                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1032         }
1033         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1034         /* free the TCB but first save off the ep */
1035 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1036         atomic_add_int(&stcb->asoc.refcnt, 1);
1037         SCTP_TCB_UNLOCK(stcb);
1038         SCTP_SOCKET_LOCK(so, 1);
1039         SCTP_TCB_LOCK(stcb);
1040         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1041 #endif
1042         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1043             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1044 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1045         SCTP_SOCKET_UNLOCK(so, 1);
1046 #endif
1047 }
1048
1049 /*
1050  * Skip past the param header and then we will find the chunk that caused the
1051  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1052  * our peer must be broken.
1053  */
1054 static void
1055 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1056     struct sctp_nets *net)
1057 {
1058         struct sctp_chunkhdr *chk;
1059
1060         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1061         switch (chk->chunk_type) {
1062         case SCTP_ASCONF_ACK:
1063         case SCTP_ASCONF:
1064                 sctp_asconf_cleanup(stcb, net);
1065                 break;
1066         case SCTP_FORWARD_CUM_TSN:
1067                 stcb->asoc.peer_supports_prsctp = 0;
1068                 break;
1069         default:
1070                 SCTPDBG(SCTP_DEBUG_INPUT2,
1071                     "Peer does not support chunk type %d(%x)??\n",
1072                     chk->chunk_type, (uint32_t) chk->chunk_type);
1073                 break;
1074         }
1075 }
1076
1077 /*
1078  * Skip past the param header and then we will find the param that caused the
1079  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1080  * these will turn of specific features.
1081  */
1082 static void
1083 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1084 {
1085         struct sctp_paramhdr *pbad;
1086
1087         pbad = phdr + 1;
1088         switch (ntohs(pbad->param_type)) {
1089                 /* pr-sctp draft */
1090         case SCTP_PRSCTP_SUPPORTED:
1091                 stcb->asoc.peer_supports_prsctp = 0;
1092                 break;
1093         case SCTP_SUPPORTED_CHUNK_EXT:
1094                 break;
1095                 /* draft-ietf-tsvwg-addip-sctp */
1096         case SCTP_HAS_NAT_SUPPORT:
1097                 stcb->asoc.peer_supports_nat = 0;
1098                 break;
1099         case SCTP_ADD_IP_ADDRESS:
1100         case SCTP_DEL_IP_ADDRESS:
1101         case SCTP_SET_PRIM_ADDR:
1102                 stcb->asoc.peer_supports_asconf = 0;
1103                 break;
1104         case SCTP_SUCCESS_REPORT:
1105         case SCTP_ERROR_CAUSE_IND:
1106                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1107                 SCTPDBG(SCTP_DEBUG_INPUT2,
1108                     "Turning off ASCONF to this strange peer\n");
1109                 stcb->asoc.peer_supports_asconf = 0;
1110                 break;
1111         default:
1112                 SCTPDBG(SCTP_DEBUG_INPUT2,
1113                     "Peer does not support param type %d(%x)??\n",
1114                     pbad->param_type, (uint32_t) pbad->param_type);
1115                 break;
1116         }
1117 }
1118
1119 static int
1120 sctp_handle_error(struct sctp_chunkhdr *ch,
1121     struct sctp_tcb *stcb, struct sctp_nets *net)
1122 {
1123         int chklen;
1124         struct sctp_paramhdr *phdr;
1125         uint16_t error_type;
1126         uint16_t error_len;
1127         struct sctp_association *asoc;
1128         int adjust;
1129
1130 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1131         struct socket *so;
1132
1133 #endif
1134
1135         /* parse through all of the errors and process */
1136         asoc = &stcb->asoc;
1137         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1138             sizeof(struct sctp_chunkhdr));
1139         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1140         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1141                 /* Process an Error Cause */
1142                 error_type = ntohs(phdr->param_type);
1143                 error_len = ntohs(phdr->param_length);
1144                 if ((error_len > chklen) || (error_len == 0)) {
1145                         /* invalid param length for this param */
1146                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1147                             chklen, error_len);
1148                         return (0);
1149                 }
1150                 switch (error_type) {
1151                 case SCTP_CAUSE_INVALID_STREAM:
1152                 case SCTP_CAUSE_MISSING_PARAM:
1153                 case SCTP_CAUSE_INVALID_PARAM:
1154                 case SCTP_CAUSE_NO_USER_DATA:
1155                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1156                             error_type);
1157                         break;
1158                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1159                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1160                             ch->chunk_flags);
1161                         if (sctp_handle_nat_colliding_state(stcb)) {
1162                                 return (0);
1163                         }
1164                         break;
1165                 case SCTP_CAUSE_NAT_MISSING_STATE:
1166                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1167                             ch->chunk_flags);
1168                         if (sctp_handle_nat_missing_state(stcb, net)) {
1169                                 return (0);
1170                         }
1171                         break;
1172                 case SCTP_CAUSE_STALE_COOKIE:
1173                         /*
1174                          * We only act if we have echoed a cookie and are
1175                          * waiting.
1176                          */
1177                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1178                                 int *p;
1179
1180                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1181                                 /* Save the time doubled */
1182                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1183                                 asoc->stale_cookie_count++;
1184                                 if (asoc->stale_cookie_count >
1185                                     asoc->max_init_times) {
1186                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1187                                         /* now free the asoc */
1188 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1189                                         so = SCTP_INP_SO(stcb->sctp_ep);
1190                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1191                                         SCTP_TCB_UNLOCK(stcb);
1192                                         SCTP_SOCKET_LOCK(so, 1);
1193                                         SCTP_TCB_LOCK(stcb);
1194                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1195 #endif
1196                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1197                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1198 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1199                                         SCTP_SOCKET_UNLOCK(so, 1);
1200 #endif
1201                                         return (-1);
1202                                 }
1203                                 /* blast back to INIT state */
1204                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1205                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1206                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1207                                 sctp_stop_all_cookie_timers(stcb);
1208                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1209                         }
1210                         break;
1211                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1212                         /*
1213                          * Nothing we can do here, we don't do hostname
1214                          * addresses so if the peer does not like my IPv6
1215                          * (or IPv4 for that matter) it does not matter. If
1216                          * they don't support that type of address, they can
1217                          * NOT possibly get that packet type... i.e. with no
1218                          * IPv6 you can't recieve a IPv6 packet. so we can
1219                          * safely ignore this one. If we ever added support
1220                          * for HOSTNAME Addresses, then we would need to do
1221                          * something here.
1222                          */
1223                         break;
1224                 case SCTP_CAUSE_UNRECOG_CHUNK:
1225                         sctp_process_unrecog_chunk(stcb, phdr, net);
1226                         break;
1227                 case SCTP_CAUSE_UNRECOG_PARAM:
1228                         sctp_process_unrecog_param(stcb, phdr);
1229                         break;
1230                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1231                         /*
1232                          * We ignore this since the timer will drive out a
1233                          * new cookie anyway and there timer will drive us
1234                          * to send a SHUTDOWN_COMPLETE. We can't send one
1235                          * here since we don't have their tag.
1236                          */
1237                         break;
1238                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1239                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1240                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1241                         /*
1242                          * We should NOT get these here, but in a
1243                          * ASCONF-ACK.
1244                          */
1245                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1246                             error_type);
1247                         break;
1248                 case SCTP_CAUSE_OUT_OF_RESC:
1249                         /*
1250                          * And what, pray tell do we do with the fact that
1251                          * the peer is out of resources? Not really sure we
1252                          * could do anything but abort. I suspect this
1253                          * should have came WITH an abort instead of in a
1254                          * OP-ERROR.
1255                          */
1256                         break;
1257                 default:
1258                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1259                             error_type);
1260                         break;
1261                 }
1262                 adjust = SCTP_SIZE32(error_len);
1263                 chklen -= adjust;
1264                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1265         }
1266         return (0);
1267 }
1268
1269 static int
1270 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1271     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1272     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1273 {
1274         struct sctp_init_ack *init_ack;
1275         struct mbuf *op_err;
1276
1277         SCTPDBG(SCTP_DEBUG_INPUT2,
1278             "sctp_handle_init_ack: handling INIT-ACK\n");
1279
1280         if (stcb == NULL) {
1281                 SCTPDBG(SCTP_DEBUG_INPUT2,
1282                     "sctp_handle_init_ack: TCB is null\n");
1283                 return (-1);
1284         }
1285         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1286                 /* Invalid length */
1287                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1288                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1289                     op_err, 0, net->port);
1290                 *abort_no_unlock = 1;
1291                 return (-1);
1292         }
1293         init_ack = &cp->init;
1294         /* validate parameters */
1295         if (init_ack->initiate_tag == 0) {
1296                 /* protocol error... send an abort */
1297                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1298                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1299                     op_err, 0, net->port);
1300                 *abort_no_unlock = 1;
1301                 return (-1);
1302         }
1303         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1304                 /* protocol error... send an abort */
1305                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1306                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1307                     op_err, 0, net->port);
1308                 *abort_no_unlock = 1;
1309                 return (-1);
1310         }
1311         if (init_ack->num_inbound_streams == 0) {
1312                 /* protocol error... send an abort */
1313                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1314                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1315                     op_err, 0, net->port);
1316                 *abort_no_unlock = 1;
1317                 return (-1);
1318         }
1319         if (init_ack->num_outbound_streams == 0) {
1320                 /* protocol error... send an abort */
1321                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1322                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1323                     op_err, 0, net->port);
1324                 *abort_no_unlock = 1;
1325                 return (-1);
1326         }
1327         /* process according to association state... */
1328         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1329         case SCTP_STATE_COOKIE_WAIT:
1330                 /* this is the expected state for this chunk */
1331                 /* process the INIT-ACK parameters */
1332                 if (stcb->asoc.primary_destination->dest_state &
1333                     SCTP_ADDR_UNCONFIRMED) {
1334                         /*
1335                          * The primary is where we sent the INIT, we can
1336                          * always consider it confirmed when the INIT-ACK is
1337                          * returned. Do this before we load addresses
1338                          * though.
1339                          */
1340                         stcb->asoc.primary_destination->dest_state &=
1341                             ~SCTP_ADDR_UNCONFIRMED;
1342                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1343                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1344                 }
1345                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1346                     net, abort_no_unlock, vrf_id) < 0) {
1347                         /* error in parsing parameters */
1348                         return (-1);
1349                 }
1350                 /* update our state */
1351                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1352                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1353
1354                 /* reset the RTO calc */
1355                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1356                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1357                             stcb->asoc.overall_error_count,
1358                             0,
1359                             SCTP_FROM_SCTP_INPUT,
1360                             __LINE__);
1361                 }
1362                 stcb->asoc.overall_error_count = 0;
1363                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1364                 /*
1365                  * collapse the init timer back in case of a exponential
1366                  * backoff
1367                  */
1368                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1369                     stcb, net);
1370                 /*
1371                  * the send at the end of the inbound data processing will
1372                  * cause the cookie to be sent
1373                  */
1374                 break;
1375         case SCTP_STATE_SHUTDOWN_SENT:
1376                 /* incorrect state... discard */
1377                 break;
1378         case SCTP_STATE_COOKIE_ECHOED:
1379                 /* incorrect state... discard */
1380                 break;
1381         case SCTP_STATE_OPEN:
1382                 /* incorrect state... discard */
1383                 break;
1384         case SCTP_STATE_EMPTY:
1385         case SCTP_STATE_INUSE:
1386         default:
1387                 /* incorrect state... discard */
1388                 return (-1);
1389                 break;
1390         }
1391         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1392         return (0);
1393 }
1394
1395 static struct sctp_tcb *
1396 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1397     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1398     struct sctp_inpcb *inp, struct sctp_nets **netp,
1399     struct sockaddr *init_src, int *notification,
1400     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1401     uint32_t vrf_id, uint16_t port);
1402
1403
1404 /*
1405  * handle a state cookie for an existing association m: input packet mbuf
1406  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1407  * "split" mbuf and the cookie signature does not exist offset: offset into
1408  * mbuf to the cookie-echo chunk
1409  */
1410 static struct sctp_tcb *
1411 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1412     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1413     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1414     struct sockaddr *init_src, int *notification,
1415     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1416 {
1417         struct sctp_association *asoc;
1418         struct sctp_init_chunk *init_cp, init_buf;
1419         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1420         struct sctp_nets *net;
1421         struct mbuf *op_err;
1422         struct sctp_paramhdr *ph;
1423         int init_offset, initack_offset, i;
1424         int retval;
1425         int spec_flag = 0;
1426         uint32_t how_indx;
1427
1428         net = *netp;
1429         /* I know that the TCB is non-NULL from the caller */
1430         asoc = &stcb->asoc;
1431         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1432                 if (asoc->cookie_how[how_indx] == 0)
1433                         break;
1434         }
1435         if (how_indx < sizeof(asoc->cookie_how)) {
1436                 asoc->cookie_how[how_indx] = 1;
1437         }
1438         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1439                 /* SHUTDOWN came in after sending INIT-ACK */
1440                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1441                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1442                     0, M_DONTWAIT, 1, MT_DATA);
1443                 if (op_err == NULL) {
1444                         /* FOOBAR */
1445                         return (NULL);
1446                 }
1447                 /* Set the len */
1448                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1449                 ph = mtod(op_err, struct sctp_paramhdr *);
1450                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1451                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1452                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1453                     vrf_id, net->port);
1454                 if (how_indx < sizeof(asoc->cookie_how))
1455                         asoc->cookie_how[how_indx] = 2;
1456                 return (NULL);
1457         }
1458         /*
1459          * find and validate the INIT chunk in the cookie (peer's info) the
1460          * INIT should start after the cookie-echo header struct (chunk
1461          * header, state cookie header struct)
1462          */
1463         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1464
1465         init_cp = (struct sctp_init_chunk *)
1466             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1467             (uint8_t *) & init_buf);
1468         if (init_cp == NULL) {
1469                 /* could not pull a INIT chunk in cookie */
1470                 return (NULL);
1471         }
1472         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1473                 return (NULL);
1474         }
1475         /*
1476          * find and validate the INIT-ACK chunk in the cookie (my info) the
1477          * INIT-ACK follows the INIT chunk
1478          */
1479         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1480         initack_cp = (struct sctp_init_ack_chunk *)
1481             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1482             (uint8_t *) & initack_buf);
1483         if (initack_cp == NULL) {
1484                 /* could not pull INIT-ACK chunk in cookie */
1485                 return (NULL);
1486         }
1487         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1488                 return (NULL);
1489         }
1490         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1491             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1492                 /*
1493                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1494                  * to get into the OPEN state
1495                  */
1496                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1497                         /*-
1498                          * Opps, this means that we somehow generated two vtag's
1499                          * the same. I.e. we did:
1500                          *  Us               Peer
1501                          *   <---INIT(tag=a)------
1502                          *   ----INIT-ACK(tag=t)-->
1503                          *   ----INIT(tag=t)------> *1
1504                          *   <---INIT-ACK(tag=a)---
1505                          *   <----CE(tag=t)------------- *2
1506                          *
1507                          * At point *1 we should be generating a different
1508                          * tag t'. Which means we would throw away the CE and send
1509                          * ours instead. Basically this is case C (throw away side).
1510                          */
1511                         if (how_indx < sizeof(asoc->cookie_how))
1512                                 asoc->cookie_how[how_indx] = 17;
1513                         return (NULL);
1514
1515                 }
1516                 switch SCTP_GET_STATE
1517                         (asoc) {
1518                 case SCTP_STATE_COOKIE_WAIT:
1519                 case SCTP_STATE_COOKIE_ECHOED:
1520                         /*
1521                          * INIT was sent but got a COOKIE_ECHO with the
1522                          * correct tags... just accept it...but we must
1523                          * process the init so that we can make sure we have
1524                          * the right seq no's.
1525                          */
1526                         /* First we must process the INIT !! */
1527                         retval = sctp_process_init(init_cp, stcb);
1528                         if (retval < 0) {
1529                                 if (how_indx < sizeof(asoc->cookie_how))
1530                                         asoc->cookie_how[how_indx] = 3;
1531                                 return (NULL);
1532                         }
1533                         /* we have already processed the INIT so no problem */
1534                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1535                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1536                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1537                         /* update current state */
1538                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1539                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1540                         else
1541                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1542
1543                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1544                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1545                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1546                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1547                         }
1548                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1549                         sctp_stop_all_cookie_timers(stcb);
1550                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1551                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1552                             (inp->sctp_socket->so_qlimit == 0)
1553                             ) {
1554 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1555                                 struct socket *so;
1556
1557 #endif
1558                                 /*
1559                                  * Here is where collision would go if we
1560                                  * did a connect() and instead got a
1561                                  * init/init-ack/cookie done before the
1562                                  * init-ack came back..
1563                                  */
1564                                 stcb->sctp_ep->sctp_flags |=
1565                                     SCTP_PCB_FLAGS_CONNECTED;
1566 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1567                                 so = SCTP_INP_SO(stcb->sctp_ep);
1568                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1569                                 SCTP_TCB_UNLOCK(stcb);
1570                                 SCTP_SOCKET_LOCK(so, 1);
1571                                 SCTP_TCB_LOCK(stcb);
1572                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1573                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1574                                         SCTP_SOCKET_UNLOCK(so, 1);
1575                                         return (NULL);
1576                                 }
1577 #endif
1578                                 soisconnected(stcb->sctp_socket);
1579 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1580                                 SCTP_SOCKET_UNLOCK(so, 1);
1581 #endif
1582                         }
1583                         /* notify upper layer */
1584                         *notification = SCTP_NOTIFY_ASSOC_UP;
1585                         /*
1586                          * since we did not send a HB make sure we don't
1587                          * double things
1588                          */
1589                         net->hb_responded = 1;
1590                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1591                             &cookie->time_entered,
1592                             sctp_align_unsafe_makecopy,
1593                             SCTP_RTT_FROM_NON_DATA);
1594
1595                         if (stcb->asoc.sctp_autoclose_ticks &&
1596                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1597                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1598                                     inp, stcb, NULL);
1599                         }
1600                         break;
1601                 default:
1602                         /*
1603                          * we're in the OPEN state (or beyond), so peer must
1604                          * have simply lost the COOKIE-ACK
1605                          */
1606                         break;
1607                         }       /* end switch */
1608                 sctp_stop_all_cookie_timers(stcb);
1609                 /*
1610                  * We ignore the return code here.. not sure if we should
1611                  * somehow abort.. but we do have an existing asoc. This
1612                  * really should not fail.
1613                  */
1614                 if (sctp_load_addresses_from_init(stcb, m,
1615                     init_offset + sizeof(struct sctp_init_chunk),
1616                     initack_offset, sh, init_src)) {
1617                         if (how_indx < sizeof(asoc->cookie_how))
1618                                 asoc->cookie_how[how_indx] = 4;
1619                         return (NULL);
1620                 }
1621                 /* respond with a COOKIE-ACK */
1622                 sctp_toss_old_cookies(stcb, asoc);
1623                 sctp_send_cookie_ack(stcb);
1624                 if (how_indx < sizeof(asoc->cookie_how))
1625                         asoc->cookie_how[how_indx] = 5;
1626                 return (stcb);
1627         }
1628         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1629             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1630             cookie->tie_tag_my_vtag == 0 &&
1631             cookie->tie_tag_peer_vtag == 0) {
1632                 /*
1633                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1634                  */
1635                 if (how_indx < sizeof(asoc->cookie_how))
1636                         asoc->cookie_how[how_indx] = 6;
1637                 return (NULL);
1638         }
1639         /*
1640          * If nat support, and the below and stcb is established, send back
1641          * a ABORT(colliding state) if we are established.
1642          */
1643         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1644             (asoc->peer_supports_nat) &&
1645             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1646             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1647             (asoc->peer_vtag == 0)))) {
1648                 /*
1649                  * Special case - Peer's support nat. We may have two init's
1650                  * that we gave out the same tag on since one was not
1651                  * established.. i.e. we get INIT from host-1 behind the nat
1652                  * and we respond tag-a, we get a INIT from host-2 behind
1653                  * the nat and we get tag-a again. Then we bring up host-1
1654                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1655                  * Now we have colliding state. We must send an abort here
1656                  * with colliding state indication.
1657                  */
1658                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1659                     0, M_DONTWAIT, 1, MT_DATA);
1660                 if (op_err == NULL) {
1661                         /* FOOBAR */
1662                         return (NULL);
1663                 }
1664                 /* pre-reserve some space */
1665 #ifdef INET6
1666                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1667 #else
1668                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1669 #endif
1670                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1671                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1672                 /* Set the len */
1673                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1674                 ph = mtod(op_err, struct sctp_paramhdr *);
1675                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1676                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1677                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1678                 return (NULL);
1679         }
1680         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1681             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1682             (asoc->peer_vtag == 0))) {
1683                 /*
1684                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1685                  * should be ok, re-accept peer info
1686                  */
1687                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1688                         /*
1689                          * Extension of case C. If we hit this, then the
1690                          * random number generator returned the same vtag
1691                          * when we first sent our INIT-ACK and when we later
1692                          * sent our INIT. The side with the seq numbers that
1693                          * are different will be the one that normnally
1694                          * would have hit case C. This in effect "extends"
1695                          * our vtags in this collision case to be 64 bits.
1696                          * The same collision could occur aka you get both
1697                          * vtag and seq number the same twice in a row.. but
1698                          * is much less likely. If it did happen then we
1699                          * would proceed through and bring up the assoc.. we
1700                          * may end up with the wrong stream setup however..
1701                          * which would be bad.. but there is no way to
1702                          * tell.. until we send on a stream that does not
1703                          * exist :-)
1704                          */
1705                         if (how_indx < sizeof(asoc->cookie_how))
1706                                 asoc->cookie_how[how_indx] = 7;
1707
1708                         return (NULL);
1709                 }
1710                 if (how_indx < sizeof(asoc->cookie_how))
1711                         asoc->cookie_how[how_indx] = 8;
1712                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1713                 sctp_stop_all_cookie_timers(stcb);
1714                 /*
1715                  * since we did not send a HB make sure we don't double
1716                  * things
1717                  */
1718                 net->hb_responded = 1;
1719                 if (stcb->asoc.sctp_autoclose_ticks &&
1720                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1721                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1722                             NULL);
1723                 }
1724                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1725                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1726
1727                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1728                         /*
1729                          * Ok the peer probably discarded our data (if we
1730                          * echoed a cookie+data). So anything on the
1731                          * sent_queue should be marked for retransmit, we
1732                          * may not get something to kick us so it COULD
1733                          * still take a timeout to move these.. but it can't
1734                          * hurt to mark them.
1735                          */
1736                         struct sctp_tmit_chunk *chk;
1737
1738                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1739                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1740                                         chk->sent = SCTP_DATAGRAM_RESEND;
1741                                         sctp_flight_size_decrease(chk);
1742                                         sctp_total_flight_decrease(stcb, chk);
1743                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1744                                         spec_flag++;
1745                                 }
1746                         }
1747
1748                 }
1749                 /* process the INIT info (peer's info) */
1750                 retval = sctp_process_init(init_cp, stcb);
1751                 if (retval < 0) {
1752                         if (how_indx < sizeof(asoc->cookie_how))
1753                                 asoc->cookie_how[how_indx] = 9;
1754                         return (NULL);
1755                 }
1756                 if (sctp_load_addresses_from_init(stcb, m,
1757                     init_offset + sizeof(struct sctp_init_chunk),
1758                     initack_offset, sh, init_src)) {
1759                         if (how_indx < sizeof(asoc->cookie_how))
1760                                 asoc->cookie_how[how_indx] = 10;
1761                         return (NULL);
1762                 }
1763                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1764                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1765                         *notification = SCTP_NOTIFY_ASSOC_UP;
1766
1767                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1768                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1769                             (inp->sctp_socket->so_qlimit == 0)) {
1770 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1771                                 struct socket *so;
1772
1773 #endif
1774                                 stcb->sctp_ep->sctp_flags |=
1775                                     SCTP_PCB_FLAGS_CONNECTED;
1776 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1777                                 so = SCTP_INP_SO(stcb->sctp_ep);
1778                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1779                                 SCTP_TCB_UNLOCK(stcb);
1780                                 SCTP_SOCKET_LOCK(so, 1);
1781                                 SCTP_TCB_LOCK(stcb);
1782                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1783                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1784                                         SCTP_SOCKET_UNLOCK(so, 1);
1785                                         return (NULL);
1786                                 }
1787 #endif
1788                                 soisconnected(stcb->sctp_socket);
1789 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1790                                 SCTP_SOCKET_UNLOCK(so, 1);
1791 #endif
1792                         }
1793                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1794                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1795                         else
1796                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1797                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1798                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1799                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1800                 } else {
1801                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1802                 }
1803                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1804                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1805                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1806                             stcb->sctp_ep, stcb, asoc->primary_destination);
1807                 }
1808                 sctp_stop_all_cookie_timers(stcb);
1809                 sctp_toss_old_cookies(stcb, asoc);
1810                 sctp_send_cookie_ack(stcb);
1811                 if (spec_flag) {
1812                         /*
1813                          * only if we have retrans set do we do this. What
1814                          * this call does is get only the COOKIE-ACK out and
1815                          * then when we return the normal call to
1816                          * sctp_chunk_output will get the retrans out behind
1817                          * this.
1818                          */
1819                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1820                 }
1821                 if (how_indx < sizeof(asoc->cookie_how))
1822                         asoc->cookie_how[how_indx] = 11;
1823
1824                 return (stcb);
1825         }
1826         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1827             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1828             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1829             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1830             cookie->tie_tag_peer_vtag != 0) {
1831                 struct sctpasochead *head;
1832
1833                 if (asoc->peer_supports_nat) {
1834                         /*
1835                          * This is a gross gross hack. just call the
1836                          * cookie_new code since we are allowing a duplicate
1837                          * association. I hope this works...
1838                          */
1839                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1840                             inp, netp, init_src, notification,
1841                             auth_skipped, auth_offset, auth_len,
1842                             vrf_id, port));
1843                 }
1844                 /*
1845                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1846                  */
1847                 /* temp code */
1848                 if (how_indx < sizeof(asoc->cookie_how))
1849                         asoc->cookie_how[how_indx] = 12;
1850                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1851                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1852
1853                 /* notify upper layer */
1854                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1855                 atomic_add_int(&stcb->asoc.refcnt, 1);
1856                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1857                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1858                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1859                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1860                 }
1861                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1862                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1863                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1864                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1865                 }
1866                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1867                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1868                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1869                             stcb->sctp_ep, stcb, asoc->primary_destination);
1870
1871                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1872                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1873                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1874                 }
1875                 asoc->pre_open_streams =
1876                     ntohs(initack_cp->init.num_outbound_streams);
1877                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1878                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1879                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1880
1881                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1882
1883                 asoc->str_reset_seq_in = asoc->init_seq_number;
1884
1885                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1886                 if (asoc->mapping_array) {
1887                         memset(asoc->mapping_array, 0,
1888                             asoc->mapping_array_size);
1889                 }
1890                 if (asoc->nr_mapping_array) {
1891                         memset(asoc->nr_mapping_array, 0,
1892                             asoc->mapping_array_size);
1893                 }
1894                 SCTP_TCB_UNLOCK(stcb);
1895                 SCTP_INP_INFO_WLOCK();
1896                 SCTP_INP_WLOCK(stcb->sctp_ep);
1897                 SCTP_TCB_LOCK(stcb);
1898                 atomic_add_int(&stcb->asoc.refcnt, -1);
1899                 /* send up all the data */
1900                 SCTP_TCB_SEND_LOCK(stcb);
1901
1902                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1903                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1904                         stcb->asoc.strmout[i].stream_no = i;
1905                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1906                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1907                 }
1908                 /* process the INIT-ACK info (my info) */
1909                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1910                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1911
1912                 /* pull from vtag hash */
1913                 LIST_REMOVE(stcb, sctp_asocs);
1914                 /* re-insert to new vtag position */
1915                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1916                     SCTP_BASE_INFO(hashasocmark))];
1917                 /*
1918                  * put it in the bucket in the vtag hash of assoc's for the
1919                  * system
1920                  */
1921                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1922
1923                 /* process the INIT info (peer's info) */
1924                 SCTP_TCB_SEND_UNLOCK(stcb);
1925                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1926                 SCTP_INP_INFO_WUNLOCK();
1927
1928                 retval = sctp_process_init(init_cp, stcb);
1929                 if (retval < 0) {
1930                         if (how_indx < sizeof(asoc->cookie_how))
1931                                 asoc->cookie_how[how_indx] = 13;
1932
1933                         return (NULL);
1934                 }
1935                 /*
1936                  * since we did not send a HB make sure we don't double
1937                  * things
1938                  */
1939                 net->hb_responded = 1;
1940
1941                 if (sctp_load_addresses_from_init(stcb, m,
1942                     init_offset + sizeof(struct sctp_init_chunk),
1943                     initack_offset, sh, init_src)) {
1944                         if (how_indx < sizeof(asoc->cookie_how))
1945                                 asoc->cookie_how[how_indx] = 14;
1946
1947                         return (NULL);
1948                 }
1949                 /* respond with a COOKIE-ACK */
1950                 sctp_stop_all_cookie_timers(stcb);
1951                 sctp_toss_old_cookies(stcb, asoc);
1952                 sctp_send_cookie_ack(stcb);
1953                 if (how_indx < sizeof(asoc->cookie_how))
1954                         asoc->cookie_how[how_indx] = 15;
1955
1956                 return (stcb);
1957         }
1958         if (how_indx < sizeof(asoc->cookie_how))
1959                 asoc->cookie_how[how_indx] = 16;
1960         /* all other cases... */
1961         return (NULL);
1962 }
1963
1964
1965 /*
1966  * handle a state cookie for a new association m: input packet mbuf chain--
1967  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1968  * and the cookie signature does not exist offset: offset into mbuf to the
1969  * cookie-echo chunk length: length of the cookie chunk to: where the init
1970  * was from returns a new TCB
1971  */
1972 struct sctp_tcb *
1973 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1974     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1975     struct sctp_inpcb *inp, struct sctp_nets **netp,
1976     struct sockaddr *init_src, int *notification,
1977     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1978     uint32_t vrf_id, uint16_t port)
1979 {
1980         struct sctp_tcb *stcb;
1981         struct sctp_init_chunk *init_cp, init_buf;
1982         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1983         struct sockaddr_storage sa_store;
1984         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1985         struct sctp_association *asoc;
1986         int init_offset, initack_offset, initack_limit;
1987         int retval;
1988         int error = 0;
1989         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1990
1991 #ifdef INET
1992         struct sockaddr_in *sin;
1993
1994 #endif
1995 #ifdef INET6
1996         struct sockaddr_in6 *sin6;
1997
1998 #endif
1999 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2000         struct socket *so;
2001
2002         so = SCTP_INP_SO(inp);
2003 #endif
2004
2005         /*
2006          * find and validate the INIT chunk in the cookie (peer's info) the
2007          * INIT should start after the cookie-echo header struct (chunk
2008          * header, state cookie header struct)
2009          */
2010         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2011         init_cp = (struct sctp_init_chunk *)
2012             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2013             (uint8_t *) & init_buf);
2014         if (init_cp == NULL) {
2015                 /* could not pull a INIT chunk in cookie */
2016                 SCTPDBG(SCTP_DEBUG_INPUT1,
2017                     "process_cookie_new: could not pull INIT chunk hdr\n");
2018                 return (NULL);
2019         }
2020         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2021                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2022                 return (NULL);
2023         }
2024         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2025         /*
2026          * find and validate the INIT-ACK chunk in the cookie (my info) the
2027          * INIT-ACK follows the INIT chunk
2028          */
2029         initack_cp = (struct sctp_init_ack_chunk *)
2030             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2031             (uint8_t *) & initack_buf);
2032         if (initack_cp == NULL) {
2033                 /* could not pull INIT-ACK chunk in cookie */
2034                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2035                 return (NULL);
2036         }
2037         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2038                 return (NULL);
2039         }
2040         /*
2041          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2042          * "initack_limit" value.  This is because the chk_length field
2043          * includes the length of the cookie, but the cookie is omitted when
2044          * the INIT and INIT_ACK are tacked onto the cookie...
2045          */
2046         initack_limit = offset + cookie_len;
2047
2048         /*
2049          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2050          * and popluate
2051          */
2052
2053         /*
2054          * Here we do a trick, we set in NULL for the proc/thread argument.
2055          * We do this since in effect we only use the p argument when the
2056          * socket is unbound and we must do an implicit bind. Since we are
2057          * getting a cookie, we cannot be unbound.
2058          */
2059         stcb = sctp_aloc_assoc(inp, init_src, &error,
2060             ntohl(initack_cp->init.initiate_tag), vrf_id,
2061             (struct thread *)NULL
2062             );
2063         if (stcb == NULL) {
2064                 struct mbuf *op_err;
2065
2066                 /* memory problem? */
2067                 SCTPDBG(SCTP_DEBUG_INPUT1,
2068                     "process_cookie_new: no room for another TCB!\n");
2069                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2070
2071                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2072                     sh, op_err, vrf_id, port);
2073                 return (NULL);
2074         }
2075         /* get the correct sctp_nets */
2076         if (netp)
2077                 *netp = sctp_findnet(stcb, init_src);
2078
2079         asoc = &stcb->asoc;
2080         /* get scope variables out of cookie */
2081         asoc->ipv4_local_scope = cookie->ipv4_scope;
2082         asoc->site_scope = cookie->site_scope;
2083         asoc->local_scope = cookie->local_scope;
2084         asoc->loopback_scope = cookie->loopback_scope;
2085
2086         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2087             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2088                 struct mbuf *op_err;
2089
2090                 /*
2091                  * Houston we have a problem. The EP changed while the
2092                  * cookie was in flight. Only recourse is to abort the
2093                  * association.
2094                  */
2095                 atomic_add_int(&stcb->asoc.refcnt, 1);
2096                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2097                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2098                     sh, op_err, vrf_id, port);
2099 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2100                 SCTP_TCB_UNLOCK(stcb);
2101                 SCTP_SOCKET_LOCK(so, 1);
2102                 SCTP_TCB_LOCK(stcb);
2103 #endif
2104                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2105                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2106 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2107                 SCTP_SOCKET_UNLOCK(so, 1);
2108 #endif
2109                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2110                 return (NULL);
2111         }
2112         /* process the INIT-ACK info (my info) */
2113         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2114         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2115         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2116         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2117         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2118         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2119         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2120         asoc->str_reset_seq_in = asoc->init_seq_number;
2121
2122         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2123
2124         /* process the INIT info (peer's info) */
2125         if (netp)
2126                 retval = sctp_process_init(init_cp, stcb);
2127         else
2128                 retval = 0;
2129         if (retval < 0) {
2130                 atomic_add_int(&stcb->asoc.refcnt, 1);
2131 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2132                 SCTP_TCB_UNLOCK(stcb);
2133                 SCTP_SOCKET_LOCK(so, 1);
2134                 SCTP_TCB_LOCK(stcb);
2135 #endif
2136                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2137 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2138                 SCTP_SOCKET_UNLOCK(so, 1);
2139 #endif
2140                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2141                 return (NULL);
2142         }
2143         /* load all addresses */
2144         if (sctp_load_addresses_from_init(stcb, m,
2145             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2146             init_src)) {
2147                 atomic_add_int(&stcb->asoc.refcnt, 1);
2148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2149                 SCTP_TCB_UNLOCK(stcb);
2150                 SCTP_SOCKET_LOCK(so, 1);
2151                 SCTP_TCB_LOCK(stcb);
2152 #endif
2153                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2154 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2155                 SCTP_SOCKET_UNLOCK(so, 1);
2156 #endif
2157                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2158                 return (NULL);
2159         }
2160         /*
2161          * verify any preceding AUTH chunk that was skipped
2162          */
2163         /* pull the local authentication parameters from the cookie/init-ack */
2164         sctp_auth_get_cookie_params(stcb, m,
2165             initack_offset + sizeof(struct sctp_init_ack_chunk),
2166             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2167         if (auth_skipped) {
2168                 struct sctp_auth_chunk *auth;
2169
2170                 auth = (struct sctp_auth_chunk *)
2171                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2172                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2173                         /* auth HMAC failed, dump the assoc and packet */
2174                         SCTPDBG(SCTP_DEBUG_AUTH1,
2175                             "COOKIE-ECHO: AUTH failed\n");
2176                         atomic_add_int(&stcb->asoc.refcnt, 1);
2177 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2178                         SCTP_TCB_UNLOCK(stcb);
2179                         SCTP_SOCKET_LOCK(so, 1);
2180                         SCTP_TCB_LOCK(stcb);
2181 #endif
2182                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2183 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2184                         SCTP_SOCKET_UNLOCK(so, 1);
2185 #endif
2186                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2187                         return (NULL);
2188                 } else {
2189                         /* remaining chunks checked... good to go */
2190                         stcb->asoc.authenticated = 1;
2191                 }
2192         }
2193         /* update current state */
2194         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2195         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2196         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2197                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2198                     stcb->sctp_ep, stcb, asoc->primary_destination);
2199         }
2200         sctp_stop_all_cookie_timers(stcb);
2201         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2202         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2203
2204         /*
2205          * if we're doing ASCONFs, check to see if we have any new local
2206          * addresses that need to get added to the peer (eg. addresses
2207          * changed while cookie echo in flight).  This needs to be done
2208          * after we go to the OPEN state to do the correct asconf
2209          * processing. else, make sure we have the correct addresses in our
2210          * lists
2211          */
2212
2213         /* warning, we re-use sin, sin6, sa_store here! */
2214         /* pull in local_address (our "from" address) */
2215         switch (cookie->laddr_type) {
2216 #ifdef INET
2217         case SCTP_IPV4_ADDRESS:
2218                 /* source addr is IPv4 */
2219                 sin = (struct sockaddr_in *)initack_src;
2220                 memset(sin, 0, sizeof(*sin));
2221                 sin->sin_family = AF_INET;
2222                 sin->sin_len = sizeof(struct sockaddr_in);
2223                 sin->sin_addr.s_addr = cookie->laddress[0];
2224                 break;
2225 #endif
2226 #ifdef INET6
2227         case SCTP_IPV6_ADDRESS:
2228                 /* source addr is IPv6 */
2229                 sin6 = (struct sockaddr_in6 *)initack_src;
2230                 memset(sin6, 0, sizeof(*sin6));
2231                 sin6->sin6_family = AF_INET6;
2232                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2233                 sin6->sin6_scope_id = cookie->scope_id;
2234                 memcpy(&sin6->sin6_addr, cookie->laddress,
2235                     sizeof(sin6->sin6_addr));
2236                 break;
2237 #endif
2238         default:
2239                 atomic_add_int(&stcb->asoc.refcnt, 1);
2240 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2241                 SCTP_TCB_UNLOCK(stcb);
2242                 SCTP_SOCKET_LOCK(so, 1);
2243                 SCTP_TCB_LOCK(stcb);
2244 #endif
2245                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2246 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2247                 SCTP_SOCKET_UNLOCK(so, 1);
2248 #endif
2249                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2250                 return (NULL);
2251         }
2252
2253         /* set up to notify upper layer */
2254         *notification = SCTP_NOTIFY_ASSOC_UP;
2255         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2256             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2257             (inp->sctp_socket->so_qlimit == 0)) {
2258                 /*
2259                  * This is an endpoint that called connect() how it got a
2260                  * cookie that is NEW is a bit of a mystery. It must be that
2261                  * the INIT was sent, but before it got there.. a complete
2262                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2263                  * should have went to the other code.. not here.. oh well..
2264                  * a bit of protection is worth having..
2265                  */
2266                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2267 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2268                 atomic_add_int(&stcb->asoc.refcnt, 1);
2269                 SCTP_TCB_UNLOCK(stcb);
2270                 SCTP_SOCKET_LOCK(so, 1);
2271                 SCTP_TCB_LOCK(stcb);
2272                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2273                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2274                         SCTP_SOCKET_UNLOCK(so, 1);
2275                         return (NULL);
2276                 }
2277 #endif
2278                 soisconnected(stcb->sctp_socket);
2279 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2280                 SCTP_SOCKET_UNLOCK(so, 1);
2281 #endif
2282         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2283             (inp->sctp_socket->so_qlimit)) {
2284                 /*
2285                  * We don't want to do anything with this one. Since it is
2286                  * the listening guy. The timer will get started for
2287                  * accepted connections in the caller.
2288                  */
2289                 ;
2290         }
2291         /* since we did not send a HB make sure we don't double things */
2292         if ((netp) && (*netp))
2293                 (*netp)->hb_responded = 1;
2294
2295         if (stcb->asoc.sctp_autoclose_ticks &&
2296             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2297                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2298         }
2299         /* calculate the RTT */
2300         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2301         if ((netp) && (*netp)) {
2302                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2303                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2304                     SCTP_RTT_FROM_NON_DATA);
2305         }
2306         /* respond with a COOKIE-ACK */
2307         sctp_send_cookie_ack(stcb);
2308
2309         /*
2310          * check the address lists for any ASCONFs that need to be sent
2311          * AFTER the cookie-ack is sent
2312          */
2313         sctp_check_address_list(stcb, m,
2314             initack_offset + sizeof(struct sctp_init_ack_chunk),
2315             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2316             initack_src, cookie->local_scope, cookie->site_scope,
2317             cookie->ipv4_scope, cookie->loopback_scope);
2318
2319
2320         return (stcb);
2321 }
2322
2323 /*
2324  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2325  * we NEED to make sure we are not already using the vtag. If so we
2326  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2327         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2328                                                             SCTP_BASE_INFO(hashasocmark))];
2329         LIST_FOREACH(stcb, head, sctp_asocs) {
2330                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2331                        -- SEND ABORT - TRY AGAIN --
2332                 }
2333         }
2334 */
2335
2336 /*
2337  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2338  * existing (non-NULL) TCB
2339  */
2340 static struct mbuf *
2341 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2342     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2343     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2344     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2345     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2346 {
2347         struct sctp_state_cookie *cookie;
2348         struct sctp_tcb *l_stcb = *stcb;
2349         struct sctp_inpcb *l_inp;
2350         struct sockaddr *to;
2351         struct sctp_pcb *ep;
2352         struct mbuf *m_sig;
2353         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2354         uint8_t *sig;
2355         uint8_t cookie_ok = 0;
2356         unsigned int size_of_pkt, sig_offset, cookie_offset;
2357         unsigned int cookie_len;
2358         struct timeval now;
2359         struct timeval time_expires;
2360         struct sockaddr_storage dest_store;
2361         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2362         struct ip *iph;
2363         int notification = 0;
2364         struct sctp_nets *netl;
2365         int had_a_existing_tcb = 0;
2366         int send_int_conf = 0;
2367
2368 #ifdef INET
2369         struct sockaddr_in sin;
2370
2371 #endif
2372 #ifdef INET6
2373         struct sockaddr_in6 sin6;
2374
2375 #endif
2376
2377         SCTPDBG(SCTP_DEBUG_INPUT2,
2378             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2379
2380         if (inp_p == NULL) {
2381                 return (NULL);
2382         }
2383         /* First get the destination address setup too. */
2384         iph = mtod(m, struct ip *);
2385         switch (iph->ip_v) {
2386 #ifdef INET
2387         case IPVERSION:
2388                 {
2389                         /* its IPv4 */
2390                         struct sockaddr_in *lsin;
2391
2392                         lsin = (struct sockaddr_in *)(localep_sa);
2393                         memset(lsin, 0, sizeof(*lsin));
2394                         lsin->sin_family = AF_INET;
2395                         lsin->sin_len = sizeof(*lsin);
2396                         lsin->sin_port = sh->dest_port;
2397                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2398                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2399                         break;
2400                 }
2401 #endif
2402 #ifdef INET6
2403         case IPV6_VERSION >> 4:
2404                 {
2405                         /* its IPv6 */
2406                         struct ip6_hdr *ip6;
2407                         struct sockaddr_in6 *lsin6;
2408
2409                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2410                         memset(lsin6, 0, sizeof(*lsin6));
2411                         lsin6->sin6_family = AF_INET6;
2412                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2413                         ip6 = mtod(m, struct ip6_hdr *);
2414                         lsin6->sin6_port = sh->dest_port;
2415                         lsin6->sin6_addr = ip6->ip6_dst;
2416                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2417                         break;
2418                 }
2419 #endif
2420         default:
2421                 return (NULL);
2422         }
2423
2424         cookie = &cp->cookie;
2425         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2426         cookie_len = ntohs(cp->ch.chunk_length);
2427
2428         if ((cookie->peerport != sh->src_port) &&
2429             (cookie->myport != sh->dest_port) &&
2430             (cookie->my_vtag != sh->v_tag)) {
2431                 /*
2432                  * invalid ports or bad tag.  Note that we always leave the
2433                  * v_tag in the header in network order and when we stored
2434                  * it in the my_vtag slot we also left it in network order.
2435                  * This maintains the match even though it may be in the
2436                  * opposite byte order of the machine :->
2437                  */
2438                 return (NULL);
2439         }
2440         if (cookie_len > size_of_pkt ||
2441             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2442             sizeof(struct sctp_init_chunk) +
2443             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2444                 /* cookie too long!  or too small */
2445                 return (NULL);
2446         }
2447         /*
2448          * split off the signature into its own mbuf (since it should not be
2449          * calculated in the sctp_hmac_m() call).
2450          */
2451         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2452         if (sig_offset > size_of_pkt) {
2453                 /* packet not correct size! */
2454                 /* XXX this may already be accounted for earlier... */
2455                 return (NULL);
2456         }
2457         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2458         if (m_sig == NULL) {
2459                 /* out of memory or ?? */
2460                 return (NULL);
2461         }
2462 #ifdef SCTP_MBUF_LOGGING
2463         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2464                 struct mbuf *mat;
2465
2466                 mat = m_sig;
2467                 while (mat) {
2468                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2469                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2470                         }
2471                         mat = SCTP_BUF_NEXT(mat);
2472                 }
2473         }
2474 #endif
2475
2476         /*
2477          * compute the signature/digest for the cookie
2478          */
2479         ep = &(*inp_p)->sctp_ep;
2480         l_inp = *inp_p;
2481         if (l_stcb) {
2482                 SCTP_TCB_UNLOCK(l_stcb);
2483         }
2484         SCTP_INP_RLOCK(l_inp);
2485         if (l_stcb) {
2486                 SCTP_TCB_LOCK(l_stcb);
2487         }
2488         /* which cookie is it? */
2489         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2490             (ep->current_secret_number != ep->last_secret_number)) {
2491                 /* it's the old cookie */
2492                 (void)sctp_hmac_m(SCTP_HMAC,
2493                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2494                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2495         } else {
2496                 /* it's the current cookie */
2497                 (void)sctp_hmac_m(SCTP_HMAC,
2498                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2499                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2500         }
2501         /* get the signature */
2502         SCTP_INP_RUNLOCK(l_inp);
2503         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2504         if (sig == NULL) {
2505                 /* couldn't find signature */
2506                 sctp_m_freem(m_sig);
2507                 return (NULL);
2508         }
2509         /* compare the received digest with the computed digest */
2510         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2511                 /* try the old cookie? */
2512                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2513                     (ep->current_secret_number != ep->last_secret_number)) {
2514                         /* compute digest with old */
2515                         (void)sctp_hmac_m(SCTP_HMAC,
2516                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2517                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2518                         /* compare */
2519                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2520                                 cookie_ok = 1;
2521                 }
2522         } else {
2523                 cookie_ok = 1;
2524         }
2525
2526         /*
2527          * Now before we continue we must reconstruct our mbuf so that
2528          * normal processing of any other chunks will work.
2529          */
2530         {
2531                 struct mbuf *m_at;
2532
2533                 m_at = m;
2534                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2535                         m_at = SCTP_BUF_NEXT(m_at);
2536                 }
2537                 SCTP_BUF_NEXT(m_at) = m_sig;
2538         }
2539
2540         if (cookie_ok == 0) {
2541                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2542                 SCTPDBG(SCTP_DEBUG_INPUT2,
2543                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2544                     (uint32_t) offset, cookie_offset, sig_offset);
2545                 return (NULL);
2546         }
2547         /*
2548          * check the cookie timestamps to be sure it's not stale
2549          */
2550         (void)SCTP_GETTIME_TIMEVAL(&now);
2551         /* Expire time is in Ticks, so we convert to seconds */
2552         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2553         time_expires.tv_usec = cookie->time_entered.tv_usec;
2554         /*
2555          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2556          * is undefined.
2557          */
2558         if (timevalcmp(&now, &time_expires, >)) {
2559                 /* cookie is stale! */
2560                 struct mbuf *op_err;
2561                 struct sctp_stale_cookie_msg *scm;
2562                 uint32_t tim;
2563
2564                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2565                     0, M_DONTWAIT, 1, MT_DATA);
2566                 if (op_err == NULL) {
2567                         /* FOOBAR */
2568                         return (NULL);
2569                 }
2570                 /* Set the len */
2571                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2572                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2573                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2574                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2575                     (sizeof(uint32_t))));
2576                 /* seconds to usec */
2577                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2578                 /* add in usec */
2579                 if (tim == 0)
2580                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2581                 scm->time_usec = htonl(tim);
2582                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2583                     vrf_id, port);
2584                 return (NULL);
2585         }
2586         /*
2587          * Now we must see with the lookup address if we have an existing
2588          * asoc. This will only happen if we were in the COOKIE-WAIT state
2589          * and a INIT collided with us and somewhere the peer sent the
2590          * cookie on another address besides the single address our assoc
2591          * had for him. In this case we will have one of the tie-tags set at
2592          * least AND the address field in the cookie can be used to look it
2593          * up.
2594          */
2595         to = NULL;
2596         switch (cookie->addr_type) {
2597 #ifdef INET6
2598         case SCTP_IPV6_ADDRESS:
2599                 memset(&sin6, 0, sizeof(sin6));
2600                 sin6.sin6_family = AF_INET6;
2601                 sin6.sin6_len = sizeof(sin6);
2602                 sin6.sin6_port = sh->src_port;
2603                 sin6.sin6_scope_id = cookie->scope_id;
2604                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2605                     sizeof(sin6.sin6_addr.s6_addr));
2606                 to = (struct sockaddr *)&sin6;
2607                 break;
2608 #endif
2609 #ifdef INET
2610         case SCTP_IPV4_ADDRESS:
2611                 memset(&sin, 0, sizeof(sin));
2612                 sin.sin_family = AF_INET;
2613                 sin.sin_len = sizeof(sin);
2614                 sin.sin_port = sh->src_port;
2615                 sin.sin_addr.s_addr = cookie->address[0];
2616                 to = (struct sockaddr *)&sin;
2617                 break;
2618 #endif
2619         default:
2620                 /* This should not happen */
2621                 return (NULL);
2622         }
2623         if ((*stcb == NULL) && to) {
2624                 /* Yep, lets check */
2625                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2626                 if (*stcb == NULL) {
2627                         /*
2628                          * We should have only got back the same inp. If we
2629                          * got back a different ep we have a problem. The
2630                          * original findep got back l_inp and now
2631                          */
2632                         if (l_inp != *inp_p) {
2633                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2634                         }
2635                 } else {
2636                         if (*locked_tcb == NULL) {
2637                                 /*
2638                                  * In this case we found the assoc only
2639                                  * after we locked the create lock. This
2640                                  * means we are in a colliding case and we
2641                                  * must make sure that we unlock the tcb if
2642                                  * its one of the cases where we throw away
2643                                  * the incoming packets.
2644                                  */
2645                                 *locked_tcb = *stcb;
2646
2647                                 /*
2648                                  * We must also increment the inp ref count
2649                                  * since the ref_count flags was set when we
2650                                  * did not find the TCB, now we found it
2651                                  * which reduces the refcount.. we must
2652                                  * raise it back out to balance it all :-)
2653                                  */
2654                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2655                                 if ((*stcb)->sctp_ep != l_inp) {
2656                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2657                                             (*stcb)->sctp_ep, l_inp);
2658                                 }
2659                         }
2660                 }
2661         }
2662         if (to == NULL) {
2663                 return (NULL);
2664         }
2665         cookie_len -= SCTP_SIGNATURE_SIZE;
2666         if (*stcb == NULL) {
2667                 /* this is the "normal" case... get a new TCB */
2668                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2669                     cookie_len, *inp_p, netp, to, &notification,
2670                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2671         } else {
2672                 /* this is abnormal... cookie-echo on existing TCB */
2673                 had_a_existing_tcb = 1;
2674                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2675                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2676                     &notification, vrf_id, auth_skipped, auth_offset, auth_len, port);
2677         }
2678
2679         if (*stcb == NULL) {
2680                 /* still no TCB... must be bad cookie-echo */
2681                 return (NULL);
2682         }
2683         if ((*netp != NULL) && (m->m_flags & M_FLOWID)) {
2684                 (*netp)->flowid = m->m_pkthdr.flowid;
2685 #ifdef INVARIANTS
2686                 (*netp)->flowidset = 1;
2687 #endif
2688         }
2689         /*
2690          * Ok, we built an association so confirm the address we sent the
2691          * INIT-ACK to.
2692          */
2693         netl = sctp_findnet(*stcb, to);
2694         /*
2695          * This code should in theory NOT run but
2696          */
2697         if (netl == NULL) {
2698                 /* TSNH! Huh, why do I need to add this address here? */
2699                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2700                         return (NULL);
2701                 }
2702                 netl = sctp_findnet(*stcb, to);
2703         }
2704         if (netl) {
2705                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2706                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2707                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2708                             netl);
2709                         send_int_conf = 1;
2710                 }
2711         }
2712         sctp_start_net_timers(*stcb);
2713         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2714                 if (!had_a_existing_tcb ||
2715                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2716                         /*
2717                          * If we have a NEW cookie or the connect never
2718                          * reached the connected state during collision we
2719                          * must do the TCP accept thing.
2720                          */
2721                         struct socket *so, *oso;
2722                         struct sctp_inpcb *inp;
2723
2724                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2725                                 /*
2726                                  * For a restart we will keep the same
2727                                  * socket, no need to do anything. I THINK!!
2728                                  */
2729                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2730                                 if (send_int_conf) {
2731                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2732                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2733                                 }
2734                                 return (m);
2735                         }
2736                         oso = (*inp_p)->sctp_socket;
2737                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2738                         SCTP_TCB_UNLOCK((*stcb));
2739                         CURVNET_SET(oso->so_vnet);
2740                         so = sonewconn(oso, 0
2741                             );
2742                         CURVNET_RESTORE();
2743                         SCTP_TCB_LOCK((*stcb));
2744                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2745
2746                         if (so == NULL) {
2747                                 struct mbuf *op_err;
2748
2749 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2750                                 struct socket *pcb_so;
2751
2752 #endif
2753                                 /* Too many sockets */
2754                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2755                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2756                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2757                                     sh, op_err, vrf_id, port);
2758 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2759                                 pcb_so = SCTP_INP_SO(*inp_p);
2760                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2761                                 SCTP_TCB_UNLOCK((*stcb));
2762                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2763                                 SCTP_TCB_LOCK((*stcb));
2764                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2765 #endif
2766                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2767 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2768                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2769 #endif
2770                                 return (NULL);
2771                         }
2772                         inp = (struct sctp_inpcb *)so->so_pcb;
2773                         SCTP_INP_INCR_REF(inp);
2774                         /*
2775                          * We add the unbound flag here so that if we get an
2776                          * soabort() before we get the move_pcb done, we
2777                          * will properly cleanup.
2778                          */
2779                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2780                             SCTP_PCB_FLAGS_CONNECTED |
2781                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2782                             SCTP_PCB_FLAGS_UNBOUND |
2783                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2784                             SCTP_PCB_FLAGS_DONT_WAKE);
2785                         inp->sctp_features = (*inp_p)->sctp_features;
2786                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2787                         inp->sctp_socket = so;
2788                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2789                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2790                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2791                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2792                         inp->sctp_context = (*inp_p)->sctp_context;
2793                         inp->inp_starting_point_for_iterator = NULL;
2794                         /*
2795                          * copy in the authentication parameters from the
2796                          * original endpoint
2797                          */
2798                         if (inp->sctp_ep.local_hmacs)
2799                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2800                         inp->sctp_ep.local_hmacs =
2801                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2802                         if (inp->sctp_ep.local_auth_chunks)
2803                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2804                         inp->sctp_ep.local_auth_chunks =
2805                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2806
2807                         /*
2808                          * Now we must move it from one hash table to
2809                          * another and get the tcb in the right place.
2810                          */
2811
2812                         /*
2813                          * This is where the one-2-one socket is put into
2814                          * the accept state waiting for the accept!
2815                          */
2816                         if (*stcb) {
2817                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2818                         }
2819                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2820
2821                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2822                         SCTP_TCB_UNLOCK((*stcb));
2823
2824                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2825                             0);
2826                         SCTP_TCB_LOCK((*stcb));
2827                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2828
2829
2830                         /*
2831                          * now we must check to see if we were aborted while
2832                          * the move was going on and the lock/unlock
2833                          * happened.
2834                          */
2835                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2836                                 /*
2837                                  * yep it was, we leave the assoc attached
2838                                  * to the socket since the sctp_inpcb_free()
2839                                  * call will send an abort for us.
2840                                  */
2841                                 SCTP_INP_DECR_REF(inp);
2842                                 return (NULL);
2843                         }
2844                         SCTP_INP_DECR_REF(inp);
2845                         /* Switch over to the new guy */
2846                         *inp_p = inp;
2847                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2848                         if (send_int_conf) {
2849                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2850                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2851                         }
2852                         /*
2853                          * Pull it from the incomplete queue and wake the
2854                          * guy
2855                          */
2856 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2857                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2858                         SCTP_TCB_UNLOCK((*stcb));
2859                         SCTP_SOCKET_LOCK(so, 1);
2860 #endif
2861                         soisconnected(so);
2862 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2863                         SCTP_TCB_LOCK((*stcb));
2864                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2865                         SCTP_SOCKET_UNLOCK(so, 1);
2866 #endif
2867                         return (m);
2868                 }
2869         }
2870         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2871                 if (notification) {
2872                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2873                 }
2874                 if (send_int_conf) {
2875                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2876                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2877                 }
2878         }
2879         return (m);
2880 }
2881
2882 static void
2883 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2884     struct sctp_tcb *stcb, struct sctp_nets *net)
2885 {
2886         /* cp must not be used, others call this without a c-ack :-) */
2887         struct sctp_association *asoc;
2888
2889         SCTPDBG(SCTP_DEBUG_INPUT2,
2890             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2891         if (stcb == NULL)
2892                 return;
2893
2894         asoc = &stcb->asoc;
2895
2896         sctp_stop_all_cookie_timers(stcb);
2897         /* process according to association state */
2898         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2899                 /* state change only needed when I am in right state */
2900                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2901                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2902                 sctp_start_net_timers(stcb);
2903                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2904                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2905                             stcb->sctp_ep, stcb, asoc->primary_destination);
2906
2907                 }
2908                 /* update RTO */
2909                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2910                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2911                 if (asoc->overall_error_count == 0) {
2912                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2913                             &asoc->time_entered, sctp_align_safe_nocopy,
2914                             SCTP_RTT_FROM_NON_DATA);
2915                 }
2916                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2917                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2918                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2919                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2920 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2921                         struct socket *so;
2922
2923 #endif
2924                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2925 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2926                         so = SCTP_INP_SO(stcb->sctp_ep);
2927                         atomic_add_int(&stcb->asoc.refcnt, 1);
2928                         SCTP_TCB_UNLOCK(stcb);
2929                         SCTP_SOCKET_LOCK(so, 1);
2930                         SCTP_TCB_LOCK(stcb);
2931                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2932 #endif
2933                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2934                                 soisconnected(stcb->sctp_socket);
2935                         }
2936 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2937                         SCTP_SOCKET_UNLOCK(so, 1);
2938 #endif
2939                 }
2940                 /*
2941                  * since we did not send a HB make sure we don't double
2942                  * things
2943                  */
2944                 net->hb_responded = 1;
2945
2946                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2947                         /*
2948                          * We don't need to do the asconf thing, nor hb or
2949                          * autoclose if the socket is closed.
2950                          */
2951                         goto closed_socket;
2952                 }
2953                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2954                     stcb, net);
2955
2956
2957                 if (stcb->asoc.sctp_autoclose_ticks &&
2958                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2959                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2960                             stcb->sctp_ep, stcb, NULL);
2961                 }
2962                 /*
2963                  * send ASCONF if parameters are pending and ASCONFs are
2964                  * allowed (eg. addresses changed when init/cookie echo were
2965                  * in flight)
2966                  */
2967                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2968                     (stcb->asoc.peer_supports_asconf) &&
2969                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2970 #ifdef SCTP_TIMER_BASED_ASCONF
2971                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2972                             stcb->sctp_ep, stcb,
2973                             stcb->asoc.primary_destination);
2974 #else
2975                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2976                             SCTP_ADDR_NOT_LOCKED);
2977 #endif
2978                 }
2979         }
2980 closed_socket:
2981         /* Toss the cookie if I can */
2982         sctp_toss_old_cookies(stcb, asoc);
2983         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2984                 /* Restart the timer if we have pending data */
2985                 struct sctp_tmit_chunk *chk;
2986
2987                 chk = TAILQ_FIRST(&asoc->sent_queue);
2988                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2989         }
2990 }
2991
2992 static void
2993 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2994     struct sctp_tcb *stcb)
2995 {
2996         struct sctp_nets *net;
2997         struct sctp_tmit_chunk *lchk;
2998         struct sctp_ecne_chunk bkup;
2999         uint8_t override_bit;
3000         uint32_t tsn, window_data_tsn;
3001         int len;
3002         unsigned int pkt_cnt;
3003
3004         len = ntohs(cp->ch.chunk_length);
3005         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3006             (len != sizeof(struct old_sctp_ecne_chunk))) {
3007                 return;
3008         }
3009         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3010                 /* Its the old format */
3011                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3012                 bkup.num_pkts_since_cwr = htonl(1);
3013                 cp = &bkup;
3014         }
3015         SCTP_STAT_INCR(sctps_recvecne);
3016         tsn = ntohl(cp->tsn);
3017         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3018         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3019         if (lchk == NULL) {
3020                 window_data_tsn = stcb->asoc.sending_seq - 1;
3021         } else {
3022                 window_data_tsn = lchk->rec.data.TSN_seq;
3023         }
3024
3025         /* Find where it was sent to if possible. */
3026         net = NULL;
3027         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3028                 if (lchk->rec.data.TSN_seq == tsn) {
3029                         net = lchk->whoTo;
3030                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3031                         break;
3032                 }
3033                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3034                         break;
3035                 }
3036         }
3037         if (net == NULL) {
3038                 /*
3039                  * What to do. A previous send of a CWR was possibly lost.
3040                  * See how old it is, we may have it marked on the actual
3041                  * net.
3042                  */
3043                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3044                         if (tsn == net->last_cwr_tsn) {
3045                                 /* Found him, send it off */
3046                                 break;
3047                         }
3048                 }
3049                 if (net == NULL) {
3050                         /*
3051                          * If we reach here, we need to send a special CWR
3052                          * that says hey, we did this a long time ago and
3053                          * you lost the response.
3054                          */
3055                         net = TAILQ_FIRST(&stcb->asoc.nets);
3056                         if (net == NULL) {
3057                                 /* TSNH */
3058                                 return;
3059                         }
3060                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3061                 } else {
3062                         override_bit = 0;
3063                 }
3064         } else {
3065                 override_bit = 0;
3066         }
3067         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3068             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3069                 /*
3070                  * JRS - Use the congestion control given in the pluggable
3071                  * CC module
3072                  */
3073                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3074                 /*
3075                  * We reduce once every RTT. So we will only lower cwnd at
3076                  * the next sending seq i.e. the window_data_tsn
3077                  */
3078                 net->cwr_window_tsn = window_data_tsn;
3079                 net->ecn_ce_pkt_cnt += pkt_cnt;
3080                 net->lost_cnt = pkt_cnt;
3081                 net->last_cwr_tsn = tsn;
3082         } else {
3083                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3084                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3085                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3086                         /*
3087                          * Another loss in the same window update how many
3088                          * marks/packets lost we have had.
3089                          */
3090                         int cnt = 1;
3091
3092                         if (pkt_cnt > net->lost_cnt) {
3093                                 /* Should be the case */
3094                                 cnt = (pkt_cnt - net->lost_cnt);
3095                                 net->ecn_ce_pkt_cnt += cnt;
3096                         }
3097                         net->lost_cnt = pkt_cnt;
3098                         net->last_cwr_tsn = tsn;
3099                         /*
3100                          * Most CC functions will ignore this call, since we
3101                          * are in-window yet of the initial CE the peer saw.
3102                          */
3103                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3104                 }
3105         }
3106         /*
3107          * We always send a CWR this way if our previous one was lost our
3108          * peer will get an update, or if it is not time again to reduce we
3109          * still get the cwr to the peer. Note we set the override when we
3110          * could not find the TSN on the chunk or the destination network.
3111          */
3112         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3113 }
3114
3115 static void
3116 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3117 {
3118         /*
3119          * Here we get a CWR from the peer. We must look in the outqueue and
3120          * make sure that we have a covered ECNE in teh control chunk part.
3121          * If so remove it.
3122          */
3123         struct sctp_tmit_chunk *chk;
3124         struct sctp_ecne_chunk *ecne;
3125         int override;
3126         uint32_t cwr_tsn;
3127
3128         cwr_tsn = ntohl(cp->tsn);
3129
3130         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3131         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3132                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3133                         continue;
3134                 }
3135                 if ((override == 0) && (chk->whoTo != net)) {
3136                         /* Must be from the right src unless override is set */
3137                         continue;
3138                 }
3139                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3140                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3141                         /* this covers this ECNE, we can remove it */
3142                         stcb->asoc.ecn_echo_cnt_onq--;
3143                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3144                             sctp_next);
3145                         if (chk->data) {
3146                                 sctp_m_freem(chk->data);
3147                                 chk->data = NULL;
3148                         }
3149                         stcb->asoc.ctrl_queue_cnt--;
3150                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3151                         if (override == 0) {
3152                                 break;
3153                         }
3154                 }
3155         }
3156 }
3157
3158 static void
3159 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3160     struct sctp_tcb *stcb, struct sctp_nets *net)
3161 {
3162         struct sctp_association *asoc;
3163
3164 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3165         struct socket *so;
3166
3167 #endif
3168
3169         SCTPDBG(SCTP_DEBUG_INPUT2,
3170             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3171         if (stcb == NULL)
3172                 return;
3173
3174         asoc = &stcb->asoc;
3175         /* process according to association state */
3176         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3177                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3178                 SCTPDBG(SCTP_DEBUG_INPUT2,
3179                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3180                 SCTP_TCB_UNLOCK(stcb);
3181                 return;
3182         }
3183         /* notify upper layer protocol */
3184         if (stcb->sctp_socket) {
3185                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3186                 /* are the queues empty? they should be */
3187                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3188                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3189                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3190                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3191                 }
3192         }
3193         /* stop the timer */
3194         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3195         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3196         /* free the TCB */
3197         SCTPDBG(SCTP_DEBUG_INPUT2,
3198             "sctp_handle_shutdown_complete: calls free-asoc\n");
3199 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3200         so = SCTP_INP_SO(stcb->sctp_ep);
3201         atomic_add_int(&stcb->asoc.refcnt, 1);
3202         SCTP_TCB_UNLOCK(stcb);
3203         SCTP_SOCKET_LOCK(so, 1);
3204         SCTP_TCB_LOCK(stcb);
3205         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3206 #endif
3207         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3208 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3209         SCTP_SOCKET_UNLOCK(so, 1);
3210 #endif
3211         return;
3212 }
3213
3214 static int
3215 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3216     struct sctp_nets *net, uint8_t flg)
3217 {
3218         switch (desc->chunk_type) {
3219         case SCTP_DATA:
3220                 /* find the tsn to resend (possibly */
3221                 {
3222                         uint32_t tsn;
3223                         struct sctp_tmit_chunk *tp1;
3224
3225                         tsn = ntohl(desc->tsn_ifany);
3226                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3227                                 if (tp1->rec.data.TSN_seq == tsn) {
3228                                         /* found it */
3229                                         break;
3230                                 }
3231                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3232                                         /* not found */
3233                                         tp1 = NULL;
3234                                         break;
3235                                 }
3236                         }
3237                         if (tp1 == NULL) {
3238                                 /*
3239                                  * Do it the other way , aka without paying
3240                                  * attention to queue seq order.
3241                                  */
3242                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3243                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3244                                         if (tp1->rec.data.TSN_seq == tsn) {
3245                                                 /* found it */
3246                                                 break;
3247                                         }
3248                                 }
3249                         }
3250                         if (tp1 == NULL) {
3251                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3252                         }
3253                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3254                                 uint8_t *ddp;
3255
3256                                 if (((flg & SCTP_BADCRC) == 0) &&
3257                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3258                                         return (0);
3259                                 }
3260                                 if ((stcb->asoc.peers_rwnd == 0) &&
3261                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3262                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3263                                         return (0);
3264                                 }
3265                                 if (stcb->asoc.peers_rwnd == 0 &&
3266                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3267                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3268                                         return (0);
3269                                 }
3270                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3271                                     sizeof(struct sctp_data_chunk));
3272                                 {
3273                                         unsigned int iii;
3274
3275                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3276                                             iii++) {
3277                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3278                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3279                                                         return (-1);
3280                                                 }
3281                                         }
3282                                 }
3283
3284                                 if (tp1->do_rtt) {
3285                                         /*
3286                                          * this guy had a RTO calculation
3287                                          * pending on it, cancel it
3288                                          */
3289                                         if (tp1->whoTo->rto_needed == 0) {
3290                                                 tp1->whoTo->rto_needed = 1;
3291                                         }
3292                                         tp1->do_rtt = 0;
3293                                 }
3294                                 SCTP_STAT_INCR(sctps_pdrpmark);
3295                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3296                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3297                                 /*
3298                                  * mark it as if we were doing a FR, since
3299                                  * we will be getting gap ack reports behind
3300                                  * the info from the router.
3301                                  */
3302                                 tp1->rec.data.doing_fast_retransmit = 1;
3303                                 /*
3304                                  * mark the tsn with what sequences can
3305                                  * cause a new FR.
3306                                  */
3307                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3308                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3309                                 } else {
3310                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3311                                 }
3312
3313                                 /* restart the timer */
3314                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3315                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3316                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3317                                     stcb, tp1->whoTo);
3318
3319                                 /* fix counts and things */
3320                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3321                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3322                                             tp1->whoTo->flight_size,
3323                                             tp1->book_size,
3324                                             (uintptr_t) stcb,
3325                                             tp1->rec.data.TSN_seq);
3326                                 }
3327                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3328                                         sctp_flight_size_decrease(tp1);
3329                                         sctp_total_flight_decrease(stcb, tp1);
3330                                 }
3331                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3332                         } {
3333                                 /* audit code */
3334                                 unsigned int audit;
3335
3336                                 audit = 0;
3337                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3338                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3339                                                 audit++;
3340                                 }
3341                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3342                                     sctp_next) {
3343                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3344                                                 audit++;
3345                                 }
3346                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3347                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3348                                             audit, stcb->asoc.sent_queue_retran_cnt);
3349 #ifndef SCTP_AUDITING_ENABLED
3350                                         stcb->asoc.sent_queue_retran_cnt = audit;
3351 #endif
3352                                 }
3353                         }
3354                 }
3355                 break;
3356         case SCTP_ASCONF:
3357                 {
3358                         struct sctp_tmit_chunk *asconf;
3359
3360                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3361                             sctp_next) {
3362                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3363                                         break;
3364                                 }
3365                         }
3366                         if (asconf) {
3367                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3368                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3369                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3370                                 asconf->snd_count--;
3371                         }
3372                 }
3373                 break;
3374         case SCTP_INITIATION:
3375                 /* resend the INIT */
3376                 stcb->asoc.dropped_special_cnt++;
3377                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3378                         /*
3379                          * If we can get it in, in a few attempts we do
3380                          * this, otherwise we let the timer fire.
3381                          */
3382                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3383                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3384                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3385                 }
3386                 break;
3387         case SCTP_SELECTIVE_ACK:
3388         case SCTP_NR_SELECTIVE_ACK:
3389                 /* resend the sack */
3390                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3391                 break;
3392         case SCTP_HEARTBEAT_REQUEST:
3393                 /* resend a demand HB */
3394                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3395                         /*
3396                          * Only retransmit if we KNOW we wont destroy the
3397                          * tcb
3398                          */
3399                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3400                 }
3401                 break;
3402         case SCTP_SHUTDOWN:
3403                 sctp_send_shutdown(stcb, net);
3404                 break;
3405         case SCTP_SHUTDOWN_ACK:
3406                 sctp_send_shutdown_ack(stcb, net);
3407                 break;
3408         case SCTP_COOKIE_ECHO:
3409                 {
3410                         struct sctp_tmit_chunk *cookie;
3411
3412                         cookie = NULL;
3413                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3414                             sctp_next) {
3415                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3416                                         break;
3417                                 }
3418                         }
3419                         if (cookie) {
3420                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3421                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3422                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3423                                 sctp_stop_all_cookie_timers(stcb);
3424                         }
3425                 }
3426                 break;
3427         case SCTP_COOKIE_ACK:
3428                 sctp_send_cookie_ack(stcb);
3429                 break;
3430         case SCTP_ASCONF_ACK:
3431                 /* resend last asconf ack */
3432                 sctp_send_asconf_ack(stcb);
3433                 break;
3434         case SCTP_FORWARD_CUM_TSN:
3435                 send_forward_tsn(stcb, &stcb->asoc);
3436                 break;
3437                 /* can't do anything with these */
3438         case SCTP_PACKET_DROPPED:
3439         case SCTP_INITIATION_ACK:       /* this should not happen */
3440         case SCTP_HEARTBEAT_ACK:
3441         case SCTP_ABORT_ASSOCIATION:
3442         case SCTP_OPERATION_ERROR:
3443         case SCTP_SHUTDOWN_COMPLETE:
3444         case SCTP_ECN_ECHO:
3445         case SCTP_ECN_CWR:
3446         default:
3447                 break;
3448         }
3449         return (0);
3450 }
3451
3452 void
3453 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3454 {
3455         int i;
3456         uint16_t temp;
3457
3458         /*
3459          * We set things to 0xffff since this is the last delivered sequence
3460          * and we will be sending in 0 after the reset.
3461          */
3462
3463         if (number_entries) {
3464                 for (i = 0; i < number_entries; i++) {
3465                         temp = ntohs(list[i]);
3466                         if (temp >= stcb->asoc.streamincnt) {
3467                                 continue;
3468                         }
3469                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3470                 }
3471         } else {
3472                 list = NULL;
3473                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3474                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3475                 }
3476         }
3477         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3478 }
3479
3480 static void
3481 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3482 {
3483         int i;
3484
3485         if (number_entries == 0) {
3486                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3487                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3488                 }
3489         } else if (number_entries) {
3490                 for (i = 0; i < number_entries; i++) {
3491                         uint16_t temp;
3492
3493                         temp = ntohs(list[i]);
3494                         if (temp >= stcb->asoc.streamoutcnt) {
3495                                 /* no such stream */
3496                                 continue;
3497                         }
3498                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3499                 }
3500         }
3501         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3502 }
3503
3504
3505 struct sctp_stream_reset_out_request *
3506 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3507 {
3508         struct sctp_association *asoc;
3509         struct sctp_stream_reset_out_req *req;
3510         struct sctp_stream_reset_out_request *r;
3511         struct sctp_tmit_chunk *chk;
3512         int len, clen;
3513
3514         asoc = &stcb->asoc;
3515         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3516                 asoc->stream_reset_outstanding = 0;
3517                 return (NULL);
3518         }
3519         if (stcb->asoc.str_reset == NULL) {
3520                 asoc->stream_reset_outstanding = 0;
3521                 return (NULL);
3522         }
3523         chk = stcb->asoc.str_reset;
3524         if (chk->data == NULL) {
3525                 return (NULL);
3526         }
3527         if (bchk) {
3528                 /* he wants a copy of the chk pointer */
3529                 *bchk = chk;
3530         }
3531         clen = chk->send_size;
3532         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3533         r = &req->sr_req;
3534         if (ntohl(r->request_seq) == seq) {
3535                 /* found it */
3536                 return (r);
3537         }
3538         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3539         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3540                 /* move to the next one, there can only be a max of two */
3541                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3542                 if (ntohl(r->request_seq) == seq) {
3543                         return (r);
3544                 }
3545         }
3546         /* that seq is not here */
3547         return (NULL);
3548 }
3549
3550 static void
3551 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3552 {
3553         struct sctp_association *asoc;
3554         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3555
3556         if (stcb->asoc.str_reset == NULL) {
3557                 return;
3558         }
3559         asoc = &stcb->asoc;
3560
3561         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3562         TAILQ_REMOVE(&asoc->control_send_queue,
3563             chk,
3564             sctp_next);
3565         if (chk->data) {
3566                 sctp_m_freem(chk->data);
3567                 chk->data = NULL;
3568         }
3569         asoc->ctrl_queue_cnt--;
3570         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3571         /* sa_ignore NO_NULL_CHK */
3572         stcb->asoc.str_reset = NULL;
3573 }
3574
3575
3576 static int
3577 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3578     uint32_t seq, uint32_t action,
3579     struct sctp_stream_reset_response *respin)
3580 {
3581         uint16_t type;
3582         int lparm_len;
3583         struct sctp_association *asoc = &stcb->asoc;
3584         struct sctp_tmit_chunk *chk;
3585         struct sctp_stream_reset_out_request *srparam;
3586         int number_entries;
3587
3588         if (asoc->stream_reset_outstanding == 0) {
3589                 /* duplicate */
3590                 return (0);
3591         }
3592         if (seq == stcb->asoc.str_reset_seq_out) {
3593                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3594                 if (srparam) {
3595                         stcb->asoc.str_reset_seq_out++;
3596                         type = ntohs(srparam->ph.param_type);
3597                         lparm_len = ntohs(srparam->ph.param_length);
3598                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3599                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3600                                 asoc->stream_reset_out_is_outstanding = 0;
3601                                 if (asoc->stream_reset_outstanding)
3602                                         asoc->stream_reset_outstanding--;
3603                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3604                                         /* do it */
3605                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3606                                 } else {
3607                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3608                                 }
3609                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3610                                 /* Answered my request */
3611                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3612                                 if (asoc->stream_reset_outstanding)
3613                                         asoc->stream_reset_outstanding--;
3614                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
3615                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3616                                 }
3617                         } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3618                                 /* Ok we now may have more streams */
3619                                 if (asoc->stream_reset_outstanding)
3620                                         asoc->stream_reset_outstanding--;
3621                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3622                                         /* Put the new streams into effect */
3623                                         stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3624                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3625                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3626                                 } else {
3627                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3628                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3629                                 }
3630                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3631                                 /**
3632                                  * a) Adopt the new in tsn.
3633                                  * b) reset the map
3634                                  * c) Adopt the new out-tsn
3635                                  */
3636                                 struct sctp_stream_reset_response_tsn *resp;
3637                                 struct sctp_forward_tsn_chunk fwdtsn;
3638                                 int abort_flag = 0;
3639
3640                                 if (respin == NULL) {
3641                                         /* huh ? */
3642                                         return (0);
3643                                 }
3644                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3645                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3646                                         asoc->stream_reset_outstanding--;
3647                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3648                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3649                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3650                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3651                                         if (abort_flag) {
3652                                                 return (1);
3653                                         }
3654                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3655                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3656                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3657                                         }
3658                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3659                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3660                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3661
3662                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3663                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3664
3665                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3666                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3667
3668                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3669                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3670
3671                                 }
3672                         }
3673                         /* get rid of the request and get the request flags */
3674                         if (asoc->stream_reset_outstanding == 0) {
3675                                 sctp_clean_up_stream_reset(stcb);
3676                         }
3677                 }
3678         }
3679         return (0);
3680 }
3681
3682 static void
3683 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3684     struct sctp_tmit_chunk *chk,
3685     struct sctp_stream_reset_in_request *req, int trunc)
3686 {
3687         uint32_t seq;
3688         int len, i;
3689         int number_entries;
3690         uint16_t temp;
3691
3692         /*
3693          * peer wants me to send a str-reset to him for my outgoing seq's if
3694          * seq_in is right.
3695          */
3696         struct sctp_association *asoc = &stcb->asoc;
3697
3698         seq = ntohl(req->request_seq);
3699         if (asoc->str_reset_seq_in == seq) {
3700                 if (trunc) {
3701                         /* Can't do it, since they exceeded our buffer size  */
3702                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3703                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3704                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3705                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3706                         len = ntohs(req->ph.param_length);
3707                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3708                         for (i = 0; i < number_entries; i++) {
3709                                 temp = ntohs(req->list_of_streams[i]);
3710                                 req->list_of_streams[i] = temp;
3711                         }
3712                         /* move the reset action back one */
3713                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3714                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3715                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3716                             asoc->str_reset_seq_out,
3717                             seq, (asoc->sending_seq - 1));
3718                         asoc->stream_reset_out_is_outstanding = 1;
3719                         asoc->str_reset = chk;
3720                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3721                         stcb->asoc.stream_reset_outstanding++;
3722                 } else {
3723                         /* Can't do it, since we have sent one out */
3724                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3725                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3726                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3727                 }
3728                 asoc->str_reset_seq_in++;
3729         } else if (asoc->str_reset_seq_in - 1 == seq) {
3730                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3731         } else if (asoc->str_reset_seq_in - 2 == seq) {
3732                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3733         } else {
3734                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3735         }
3736 }
3737
3738 static int
3739 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3740     struct sctp_tmit_chunk *chk,
3741     struct sctp_stream_reset_tsn_request *req)
3742 {
3743         /* reset all in and out and update the tsn */
3744         /*
3745          * A) reset my str-seq's on in and out. B) Select a receive next,
3746          * and set cum-ack to it. Also process this selected number as a
3747          * fwd-tsn as well. C) set in the response my next sending seq.
3748          */
3749         struct sctp_forward_tsn_chunk fwdtsn;
3750         struct sctp_association *asoc = &stcb->asoc;
3751         int abort_flag = 0;
3752         uint32_t seq;
3753
3754         seq = ntohl(req->request_seq);
3755         if (asoc->str_reset_seq_in == seq) {
3756                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3757                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3758                 fwdtsn.ch.chunk_flags = 0;
3759                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3760                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3761                 if (abort_flag) {
3762                         return (1);
3763                 }
3764                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3765                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3766                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3767                 }
3768                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3769                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3770                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3771                 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3772                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3773                 atomic_add_int(&stcb->asoc.sending_seq, 1);
3774                 /* save off historical data for retrans */
3775                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3776                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3777                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3778                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3779
3780                 sctp_add_stream_reset_result_tsn(chk,
3781                     ntohl(req->request_seq),
3782                     SCTP_STREAM_RESET_PERFORMED,
3783                     stcb->asoc.sending_seq,
3784                     stcb->asoc.mapping_array_base_tsn);
3785                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3786                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3787                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3788                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3789
3790                 asoc->str_reset_seq_in++;
3791         } else if (asoc->str_reset_seq_in - 1 == seq) {
3792                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3793                     stcb->asoc.last_sending_seq[0],
3794                     stcb->asoc.last_base_tsnsent[0]
3795                     );
3796         } else if (asoc->str_reset_seq_in - 2 == seq) {
3797                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3798                     stcb->asoc.last_sending_seq[1],
3799                     stcb->asoc.last_base_tsnsent[1]
3800                     );
3801         } else {
3802                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3803         }
3804         return (0);
3805 }
3806
3807 static void
3808 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3809     struct sctp_tmit_chunk *chk,
3810     struct sctp_stream_reset_out_request *req, int trunc)
3811 {
3812         uint32_t seq, tsn;
3813         int number_entries, len;
3814         struct sctp_association *asoc = &stcb->asoc;
3815
3816         seq = ntohl(req->request_seq);
3817
3818         /* now if its not a duplicate we process it */
3819         if (asoc->str_reset_seq_in == seq) {
3820                 len = ntohs(req->ph.param_length);
3821                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3822                 /*
3823                  * the sender is resetting, handle the list issue.. we must
3824                  * a) verify if we can do the reset, if so no problem b) If
3825                  * we can't do the reset we must copy the request. c) queue
3826                  * it, and setup the data in processor to trigger it off
3827                  * when needed and dequeue all the queued data.
3828                  */
3829                 tsn = ntohl(req->send_reset_at_tsn);
3830
3831                 /* move the reset action back one */
3832                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3833                 if (trunc) {
3834                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3835                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3836                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3837                         /* we can do it now */
3838                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3839                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3840                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3841                 } else {
3842                         /*
3843                          * we must queue it up and thus wait for the TSN's
3844                          * to arrive that are at or before tsn
3845                          */
3846                         struct sctp_stream_reset_list *liste;
3847                         int siz;
3848
3849                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3850                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3851                             siz, SCTP_M_STRESET);
3852                         if (liste == NULL) {
3853                                 /* gak out of memory */
3854                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3855                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3856                                 return;
3857                         }
3858                         liste->tsn = tsn;
3859                         liste->number_entries = number_entries;
3860                         memcpy(&liste->req, req,
3861                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3862                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3863                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3864                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3865                 }
3866                 asoc->str_reset_seq_in++;
3867         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3868                 /*
3869                  * one seq back, just echo back last action since my
3870                  * response was lost.
3871                  */
3872                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3873         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3874                 /*
3875                  * two seq back, just echo back last action since my
3876                  * response was lost.
3877                  */
3878                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3879         } else {
3880                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3881         }
3882 }
3883
3884 static void
3885 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3886     struct sctp_stream_reset_add_strm *str_add)
3887 {
3888         /*
3889          * Peer is requesting to add more streams. If its within our
3890          * max-streams we will allow it.
3891          */
3892         uint16_t num_stream, i;
3893         uint32_t seq;
3894         struct sctp_association *asoc = &stcb->asoc;
3895         struct sctp_queued_to_read *ctl, *nctl;
3896
3897         /* Get the number. */
3898         seq = ntohl(str_add->request_seq);
3899         num_stream = ntohs(str_add->number_of_streams);
3900         /* Now what would be the new total? */
3901         if (asoc->str_reset_seq_in == seq) {
3902                 num_stream += stcb->asoc.streamincnt;
3903                 if (num_stream > stcb->asoc.max_inbound_streams) {
3904                         /* We must reject it they ask for to many */
3905         denied:
3906                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3907                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3908                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3909                 } else {
3910                         /* Ok, we can do that :-) */
3911                         struct sctp_stream_in *oldstrm;
3912
3913                         /* save off the old */
3914                         oldstrm = stcb->asoc.strmin;
3915                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3916                             (num_stream * sizeof(struct sctp_stream_in)),
3917                             SCTP_M_STRMI);
3918                         if (stcb->asoc.strmin == NULL) {
3919                                 stcb->asoc.strmin = oldstrm;
3920                                 goto denied;
3921                         }
3922                         /* copy off the old data */
3923                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3924                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3925                                 stcb->asoc.strmin[i].stream_no = i;
3926                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3927                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3928                                 /* now anything on those queues? */
3929                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3930                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3931                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3932                                 }
3933                         }
3934                         /* Init the new streams */
3935                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3936                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3937                                 stcb->asoc.strmin[i].stream_no = i;
3938                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3939                                 stcb->asoc.strmin[i].delivery_started = 0;
3940                         }
3941                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3942                         /* update the size */
3943                         stcb->asoc.streamincnt = num_stream;
3944                         /* Send the ack */
3945                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3946                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3947                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3948                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3949                             (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3950                 }
3951         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3952                 /*
3953                  * one seq back, just echo back last action since my
3954                  * response was lost.
3955                  */
3956                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3957         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3958                 /*
3959                  * two seq back, just echo back last action since my
3960                  * response was lost.
3961                  */
3962                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3963         } else {
3964                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3965
3966         }
3967 }
3968
3969 #ifdef __GNUC__
3970 __attribute__((noinline))
3971 #endif
3972         static int
3973             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3974         struct sctp_stream_reset_out_req *sr_req)
3975 {
3976         int chk_length, param_len, ptype;
3977         struct sctp_paramhdr pstore;
3978         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3979
3980         uint32_t seq;
3981         int num_req = 0;
3982         int trunc = 0;
3983         struct sctp_tmit_chunk *chk;
3984         struct sctp_chunkhdr *ch;
3985         struct sctp_paramhdr *ph;
3986         int ret_code = 0;
3987         int num_param = 0;
3988
3989         /* now it may be a reset or a reset-response */
3990         chk_length = ntohs(sr_req->ch.chunk_length);
3991
3992         /* setup for adding the response */
3993         sctp_alloc_a_chunk(stcb, chk);
3994         if (chk == NULL) {
3995                 return (ret_code);
3996         }
3997         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3998         chk->rec.chunk_id.can_take_data = 0;
3999         chk->asoc = &stcb->asoc;
4000         chk->no_fr_allowed = 0;
4001         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4002         chk->book_size_scale = 0;
4003         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4004         if (chk->data == NULL) {
4005 strres_nochunk:
4006                 if (chk->data) {
4007                         sctp_m_freem(chk->data);
4008                         chk->data = NULL;
4009                 }
4010                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4011                 return (ret_code);
4012         }
4013         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4014
4015         /* setup chunk parameters */
4016         chk->sent = SCTP_DATAGRAM_UNSENT;
4017         chk->snd_count = 0;
4018         chk->whoTo = NULL;
4019
4020         ch = mtod(chk->data, struct sctp_chunkhdr *);
4021         ch->chunk_type = SCTP_STREAM_RESET;
4022         ch->chunk_flags = 0;
4023         ch->chunk_length = htons(chk->send_size);
4024         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4025         offset += sizeof(struct sctp_chunkhdr);
4026         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4027                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4028                 if (ph == NULL)
4029                         break;
4030                 param_len = ntohs(ph->param_length);
4031                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4032                         /* bad param */
4033                         break;
4034                 }
4035                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4036                     (uint8_t *) & cstore);
4037                 ptype = ntohs(ph->param_type);
4038                 num_param++;
4039                 if (param_len > (int)sizeof(cstore)) {
4040                         trunc = 1;
4041                 } else {
4042                         trunc = 0;
4043                 }
4044
4045                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4046                         /* hit the max of parameters already sorry.. */
4047                         break;
4048                 }
4049                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4050                         struct sctp_stream_reset_out_request *req_out;
4051
4052                         req_out = (struct sctp_stream_reset_out_request *)ph;
4053                         num_req++;
4054                         if (stcb->asoc.stream_reset_outstanding) {
4055                                 seq = ntohl(req_out->response_seq);
4056                                 if (seq == stcb->asoc.str_reset_seq_out) {
4057                                         /* implicit ack */
4058                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
4059                                 }
4060                         }
4061                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4062                 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
4063                         struct sctp_stream_reset_add_strm *str_add;
4064
4065                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4066                         num_req++;
4067                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4068                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4069                         struct sctp_stream_reset_in_request *req_in;
4070
4071                         num_req++;
4072
4073                         req_in = (struct sctp_stream_reset_in_request *)ph;
4074
4075                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4076                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4077                         struct sctp_stream_reset_tsn_request *req_tsn;
4078
4079                         num_req++;
4080                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4081
4082                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4083                                 ret_code = 1;
4084                                 goto strres_nochunk;
4085                         }
4086                         /* no more */
4087                         break;
4088                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4089                         struct sctp_stream_reset_response *resp;
4090                         uint32_t result;
4091
4092                         resp = (struct sctp_stream_reset_response *)ph;
4093                         seq = ntohl(resp->response_seq);
4094                         result = ntohl(resp->result);
4095                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4096                                 ret_code = 1;
4097                                 goto strres_nochunk;
4098                         }
4099                 } else {
4100                         break;
4101                 }
4102                 offset += SCTP_SIZE32(param_len);
4103                 chk_length -= SCTP_SIZE32(param_len);
4104         }
4105         if (num_req == 0) {
4106                 /* we have no response free the stuff */
4107                 goto strres_nochunk;
4108         }
4109         /* ok we have a chunk to link in */
4110         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4111             chk,
4112             sctp_next);
4113         stcb->asoc.ctrl_queue_cnt++;
4114         return (ret_code);
4115 }
4116
4117 /*
4118  * Handle a router or endpoints report of a packet loss, there are two ways
4119  * to handle this, either we get the whole packet and must disect it
4120  * ourselves (possibly with truncation and or corruption) or it is a summary
4121  * from a middle box that did the disectting for us.
4122  */
4123 static void
4124 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4125     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4126 {
4127         uint32_t bottle_bw, on_queue;
4128         uint16_t trunc_len;
4129         unsigned int chlen;
4130         unsigned int at;
4131         struct sctp_chunk_desc desc;
4132         struct sctp_chunkhdr *ch;
4133
4134         chlen = ntohs(cp->ch.chunk_length);
4135         chlen -= sizeof(struct sctp_pktdrop_chunk);
4136         /* XXX possible chlen underflow */
4137         if (chlen == 0) {
4138                 ch = NULL;
4139                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4140                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4141         } else {
4142                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4143                 chlen -= sizeof(struct sctphdr);
4144                 /* XXX possible chlen underflow */
4145                 memset(&desc, 0, sizeof(desc));
4146         }
4147         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4148         if (trunc_len > limit) {
4149                 trunc_len = limit;
4150         }
4151         /* now the chunks themselves */
4152         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4153                 desc.chunk_type = ch->chunk_type;
4154                 /* get amount we need to move */
4155                 at = ntohs(ch->chunk_length);
4156                 if (at < sizeof(struct sctp_chunkhdr)) {
4157                         /* corrupt chunk, maybe at the end? */
4158                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4159                         break;
4160                 }
4161                 if (trunc_len == 0) {
4162                         /* we are supposed to have all of it */
4163                         if (at > chlen) {
4164                                 /* corrupt skip it */
4165                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4166                                 break;
4167                         }
4168                 } else {
4169                         /* is there enough of it left ? */
4170                         if (desc.chunk_type == SCTP_DATA) {
4171                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4172                                     sizeof(desc.data_bytes))) {
4173                                         break;
4174                                 }
4175                         } else {
4176                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4177                                         break;
4178                                 }
4179                         }
4180                 }
4181                 if (desc.chunk_type == SCTP_DATA) {
4182                         /* can we get out the tsn? */
4183                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4184                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4185
4186                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4187                                 /* yep */
4188                                 struct sctp_data_chunk *dcp;
4189                                 uint8_t *ddp;
4190                                 unsigned int iii;
4191
4192                                 dcp = (struct sctp_data_chunk *)ch;
4193                                 ddp = (uint8_t *) (dcp + 1);
4194                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4195                                         desc.data_bytes[iii] = ddp[iii];
4196                                 }
4197                                 desc.tsn_ifany = dcp->dp.tsn;
4198                         } else {
4199                                 /* nope we are done. */
4200                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4201                                 break;
4202                         }
4203                 } else {
4204                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4205                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4206                 }
4207
4208                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4209                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4210                         break;
4211                 }
4212                 if (SCTP_SIZE32(at) > chlen) {
4213                         break;
4214                 }
4215                 chlen -= SCTP_SIZE32(at);
4216                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4217                         /* done, none left */
4218                         break;
4219                 }
4220                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4221         }
4222         /* Now update any rwnd --- possibly */
4223         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4224                 /* From a peer, we get a rwnd report */
4225                 uint32_t a_rwnd;
4226
4227                 SCTP_STAT_INCR(sctps_pdrpfehos);
4228
4229                 bottle_bw = ntohl(cp->bottle_bw);
4230                 on_queue = ntohl(cp->current_onq);
4231                 if (bottle_bw && on_queue) {
4232                         /* a rwnd report is in here */
4233                         if (bottle_bw > on_queue)
4234                                 a_rwnd = bottle_bw - on_queue;
4235                         else
4236                                 a_rwnd = 0;
4237
4238                         if (a_rwnd == 0)
4239                                 stcb->asoc.peers_rwnd = 0;
4240                         else {
4241                                 if (a_rwnd > stcb->asoc.total_flight) {
4242                                         stcb->asoc.peers_rwnd =
4243                                             a_rwnd - stcb->asoc.total_flight;
4244                                 } else {
4245                                         stcb->asoc.peers_rwnd = 0;
4246                                 }
4247                                 if (stcb->asoc.peers_rwnd <
4248                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4249                                         /* SWS sender side engages */
4250                                         stcb->asoc.peers_rwnd = 0;
4251                                 }
4252                         }
4253                 }
4254         } else {
4255                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4256         }
4257
4258         /* now middle boxes in sat networks get a cwnd bump */
4259         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4260             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4261             (stcb->asoc.sat_network)) {
4262                 /*
4263                  * This is debateable but for sat networks it makes sense
4264                  * Note if a T3 timer has went off, we will prohibit any
4265                  * changes to cwnd until we exit the t3 loss recovery.
4266                  */
4267                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4268                     net, cp, &bottle_bw, &on_queue);
4269         }
4270 }
4271
4272 /*
4273  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4274  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4275  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4276  * length of the complete packet outputs: - length: modified to remaining
4277  * length after control processing - netp: modified to new sctp_nets after
4278  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4279  * bad packet,...) otherwise return the tcb for this packet
4280  */
4281 #ifdef __GNUC__
4282 __attribute__((noinline))
4283 #endif
4284         static struct sctp_tcb *
4285                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4286              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4287              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4288              uint32_t vrf_id, uint16_t port)
4289 {
4290         struct sctp_association *asoc;
4291         uint32_t vtag_in;
4292         int num_chunks = 0;     /* number of control chunks processed */
4293         uint32_t chk_length;
4294         int ret;
4295         int abort_no_unlock = 0;
4296         int ecne_seen = 0;
4297
4298         /*
4299          * How big should this be, and should it be alloc'd? Lets try the
4300          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4301          * until we get into jumbo grams and such..
4302          */
4303         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4304         struct sctp_tcb *locked_tcb = stcb;
4305         int got_auth = 0;
4306         uint32_t auth_offset = 0, auth_len = 0;
4307         int auth_skipped = 0;
4308         int asconf_cnt = 0;
4309
4310 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4311         struct socket *so;
4312
4313 #endif
4314
4315         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4316             iphlen, *offset, length, stcb);
4317
4318         /* validate chunk header length... */
4319         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4320                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4321                     ntohs(ch->chunk_length));
4322                 if (locked_tcb) {
4323                         SCTP_TCB_UNLOCK(locked_tcb);
4324                 }
4325                 return (NULL);
4326         }
4327         /*
4328          * validate the verification tag
4329          */
4330         vtag_in = ntohl(sh->v_tag);
4331
4332         if (locked_tcb) {
4333                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4334         }
4335         if (ch->chunk_type == SCTP_INITIATION) {
4336                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4337                     ntohs(ch->chunk_length), vtag_in);
4338                 if (vtag_in != 0) {
4339                         /* protocol error- silently discard... */
4340                         SCTP_STAT_INCR(sctps_badvtag);
4341                         if (locked_tcb) {
4342                                 SCTP_TCB_UNLOCK(locked_tcb);
4343                         }
4344                         return (NULL);
4345                 }
4346         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4347                 /*
4348                  * If there is no stcb, skip the AUTH chunk and process
4349                  * later after a stcb is found (to validate the lookup was
4350                  * valid.
4351                  */
4352                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4353                     (stcb == NULL) &&
4354                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4355                         /* save this chunk for later processing */
4356                         auth_skipped = 1;
4357                         auth_offset = *offset;
4358                         auth_len = ntohs(ch->chunk_length);
4359
4360                         /* (temporarily) move past this chunk */
4361                         *offset += SCTP_SIZE32(auth_len);
4362                         if (*offset >= length) {
4363                                 /* no more data left in the mbuf chain */
4364                                 *offset = length;
4365                                 if (locked_tcb) {
4366                                         SCTP_TCB_UNLOCK(locked_tcb);
4367                                 }
4368                                 return (NULL);
4369                         }
4370                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4371                             sizeof(struct sctp_chunkhdr), chunk_buf);
4372                 }
4373                 if (ch == NULL) {
4374                         /* Help */
4375                         *offset = length;
4376                         if (locked_tcb) {
4377                                 SCTP_TCB_UNLOCK(locked_tcb);
4378                         }
4379                         return (NULL);
4380                 }
4381                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4382                         goto process_control_chunks;
4383                 }
4384                 /*
4385                  * first check if it's an ASCONF with an unknown src addr we
4386                  * need to look inside to find the association
4387                  */
4388                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4389                         struct sctp_chunkhdr *asconf_ch = ch;
4390                         uint32_t asconf_offset = 0, asconf_len = 0;
4391
4392                         /* inp's refcount may be reduced */
4393                         SCTP_INP_INCR_REF(inp);
4394
4395                         asconf_offset = *offset;
4396                         do {
4397                                 asconf_len = ntohs(asconf_ch->chunk_length);
4398                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4399                                         break;
4400                                 stcb = sctp_findassociation_ep_asconf(m,
4401                                     *offset, sh, &inp, netp, vrf_id);
4402                                 if (stcb != NULL)
4403                                         break;
4404                                 asconf_offset += SCTP_SIZE32(asconf_len);
4405                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4406                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4407                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4408                         if (stcb == NULL) {
4409                                 /*
4410                                  * reduce inp's refcount if not reduced in
4411                                  * sctp_findassociation_ep_asconf().
4412                                  */
4413                                 SCTP_INP_DECR_REF(inp);
4414                         } else {
4415                                 locked_tcb = stcb;
4416                         }
4417
4418                         /* now go back and verify any auth chunk to be sure */
4419                         if (auth_skipped && (stcb != NULL)) {
4420                                 struct sctp_auth_chunk *auth;
4421
4422                                 auth = (struct sctp_auth_chunk *)
4423                                     sctp_m_getptr(m, auth_offset,
4424                                     auth_len, chunk_buf);
4425                                 got_auth = 1;
4426                                 auth_skipped = 0;
4427                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4428                                     auth_offset)) {
4429                                         /* auth HMAC failed so dump it */
4430                                         *offset = length;
4431                                         if (locked_tcb) {
4432                                                 SCTP_TCB_UNLOCK(locked_tcb);
4433                                         }
4434                                         return (NULL);
4435                                 } else {
4436                                         /* remaining chunks are HMAC checked */
4437                                         stcb->asoc.authenticated = 1;
4438                                 }
4439                         }
4440                 }
4441                 if (stcb == NULL) {
4442                         /* no association, so it's out of the blue... */
4443                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4444                             vrf_id, port);
4445                         *offset = length;
4446                         if (locked_tcb) {
4447                                 SCTP_TCB_UNLOCK(locked_tcb);
4448                         }
4449                         return (NULL);
4450                 }
4451                 asoc = &stcb->asoc;
4452                 /* ABORT and SHUTDOWN can use either v_tag... */
4453                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4454                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4455                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4456                         if ((vtag_in == asoc->my_vtag) ||
4457                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4458                             (vtag_in == asoc->peer_vtag))) {
4459                                 /* this is valid */
4460                         } else {
4461                                 /* drop this packet... */
4462                                 SCTP_STAT_INCR(sctps_badvtag);
4463                                 if (locked_tcb) {
4464                                         SCTP_TCB_UNLOCK(locked_tcb);
4465                                 }
4466                                 return (NULL);
4467                         }
4468                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4469                         if (vtag_in != asoc->my_vtag) {
4470                                 /*
4471                                  * this could be a stale SHUTDOWN-ACK or the
4472                                  * peer never got the SHUTDOWN-COMPLETE and
4473                                  * is still hung; we have started a new asoc
4474                                  * but it won't complete until the shutdown
4475                                  * is completed
4476                                  */
4477                                 if (locked_tcb) {
4478                                         SCTP_TCB_UNLOCK(locked_tcb);
4479                                 }
4480                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4481                                     NULL, vrf_id, port);
4482                                 return (NULL);
4483                         }
4484                 } else {
4485                         /* for all other chunks, vtag must match */
4486                         if (vtag_in != asoc->my_vtag) {
4487                                 /* invalid vtag... */
4488                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4489                                     "invalid vtag: %xh, expect %xh\n",
4490                                     vtag_in, asoc->my_vtag);
4491                                 SCTP_STAT_INCR(sctps_badvtag);
4492                                 if (locked_tcb) {
4493                                         SCTP_TCB_UNLOCK(locked_tcb);
4494                                 }
4495                                 *offset = length;
4496                                 return (NULL);
4497                         }
4498                 }
4499         }                       /* end if !SCTP_COOKIE_ECHO */
4500         /*
4501          * process all control chunks...
4502          */
4503         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4504             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4505             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4506             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4507                 /* implied cookie-ack.. we must have lost the ack */
4508                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4509                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4510                             stcb->asoc.overall_error_count,
4511                             0,
4512                             SCTP_FROM_SCTP_INPUT,
4513                             __LINE__);
4514                 }
4515                 stcb->asoc.overall_error_count = 0;
4516                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4517                     *netp);
4518         }
4519 process_control_chunks:
4520         while (IS_SCTP_CONTROL(ch)) {
4521                 /* validate chunk length */
4522                 chk_length = ntohs(ch->chunk_length);
4523                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4524                     ch->chunk_type, chk_length);
4525                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4526                 if (chk_length < sizeof(*ch) ||
4527                     (*offset + (int)chk_length) > length) {
4528                         *offset = length;
4529                         if (locked_tcb) {
4530                                 SCTP_TCB_UNLOCK(locked_tcb);
4531                         }
4532                         return (NULL);
4533                 }
4534                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4535                 /*
4536                  * INIT-ACK only gets the init ack "header" portion only
4537                  * because we don't have to process the peer's COOKIE. All
4538                  * others get a complete chunk.
4539                  */
4540                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4541                     (ch->chunk_type == SCTP_INITIATION)) {
4542                         /* get an init-ack chunk */
4543                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4544                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4545                         if (ch == NULL) {
4546                                 *offset = length;
4547                                 if (locked_tcb) {
4548                                         SCTP_TCB_UNLOCK(locked_tcb);
4549                                 }
4550                                 return (NULL);
4551                         }
4552                 } else {
4553                         /* For cookies and all other chunks. */
4554                         if (chk_length > sizeof(chunk_buf)) {
4555                                 /*
4556                                  * use just the size of the chunk buffer so
4557                                  * the front part of our chunks fit in
4558                                  * contiguous space up to the chunk buffer
4559                                  * size (508 bytes). For chunks that need to
4560                                  * get more than that they must use the
4561                                  * sctp_m_getptr() function or other means
4562                                  * (e.g. know how to parse mbuf chains).
4563                                  * Cookies do this already.
4564                                  */
4565                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4566                                     (sizeof(chunk_buf) - 4),
4567                                     chunk_buf);
4568                                 if (ch == NULL) {
4569                                         *offset = length;
4570                                         if (locked_tcb) {
4571                                                 SCTP_TCB_UNLOCK(locked_tcb);
4572                                         }
4573                                         return (NULL);
4574                                 }
4575                         } else {
4576                                 /* We can fit it all */
4577                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4578                                     chk_length, chunk_buf);
4579                                 if (ch == NULL) {
4580                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4581                                         *offset = length;
4582                                         if (locked_tcb) {
4583                                                 SCTP_TCB_UNLOCK(locked_tcb);
4584                                         }
4585                                         return (NULL);
4586                                 }
4587                         }
4588                 }
4589                 num_chunks++;
4590                 /* Save off the last place we got a control from */
4591                 if (stcb != NULL) {
4592                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4593                                 /*
4594                                  * allow last_control to be NULL if
4595                                  * ASCONF... ASCONF processing will find the
4596                                  * right net later
4597                                  */
4598                                 if ((netp != NULL) && (*netp != NULL))
4599                                         stcb->asoc.last_control_chunk_from = *netp;
4600                         }
4601                 }
4602 #ifdef SCTP_AUDITING_ENABLED
4603                 sctp_audit_log(0xB0, ch->chunk_type);
4604 #endif
4605
4606                 /* check to see if this chunk required auth, but isn't */
4607                 if ((stcb != NULL) &&
4608                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4609                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4610                     !stcb->asoc.authenticated) {
4611                         /* "silently" ignore */
4612                         SCTP_STAT_INCR(sctps_recvauthmissing);
4613                         goto next_chunk;
4614                 }
4615                 switch (ch->chunk_type) {
4616                 case SCTP_INITIATION:
4617                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4618                         /* The INIT chunk must be the only chunk. */
4619                         if ((num_chunks > 1) ||
4620                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4621                                 sctp_abort_association(inp, stcb, m,
4622                                     iphlen, sh, NULL, vrf_id, port);
4623                                 *offset = length;
4624                                 return (NULL);
4625                         }
4626                         /* Honor our resource limit. */
4627                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4628                                 struct mbuf *op_err;
4629
4630                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
4631                                 sctp_abort_association(inp, stcb, m,
4632                                     iphlen, sh, op_err, vrf_id, port);
4633                                 *offset = length;
4634                                 return (NULL);
4635                         }
4636                         sctp_handle_init(m, iphlen, *offset, sh,
4637                             (struct sctp_init_chunk *)ch, inp,
4638                             stcb, &abort_no_unlock, vrf_id, port);
4639                         *offset = length;
4640                         if ((!abort_no_unlock) && (locked_tcb)) {
4641                                 SCTP_TCB_UNLOCK(locked_tcb);
4642                         }
4643                         return (NULL);
4644                         break;
4645                 case SCTP_PAD_CHUNK:
4646                         break;
4647                 case SCTP_INITIATION_ACK:
4648                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4649                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4650                                 /* We are not interested anymore */
4651                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4652                                         ;
4653                                 } else {
4654                                         if (locked_tcb != stcb) {
4655                                                 /* Very unlikely */
4656                                                 SCTP_TCB_UNLOCK(locked_tcb);
4657                                         }
4658                                         *offset = length;
4659                                         if (stcb) {
4660 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4661                                                 so = SCTP_INP_SO(inp);
4662                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4663                                                 SCTP_TCB_UNLOCK(stcb);
4664                                                 SCTP_SOCKET_LOCK(so, 1);
4665                                                 SCTP_TCB_LOCK(stcb);
4666                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4667 #endif
4668                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4669 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4670                                                 SCTP_SOCKET_UNLOCK(so, 1);
4671 #endif
4672                                         }
4673                                         return (NULL);
4674                                 }
4675                         }
4676                         /* The INIT-ACK chunk must be the only chunk. */
4677                         if ((num_chunks > 1) ||
4678                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4679                                 *offset = length;
4680                                 if (locked_tcb) {
4681                                         SCTP_TCB_UNLOCK(locked_tcb);
4682                                 }
4683                                 return (NULL);
4684                         }
4685                         if ((netp) && (*netp)) {
4686                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4687                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4688                         } else {
4689                                 ret = -1;
4690                         }
4691                         *offset = length;
4692                         if (abort_no_unlock) {
4693                                 return (NULL);
4694                         }
4695                         /*
4696                          * Special case, I must call the output routine to
4697                          * get the cookie echoed
4698                          */
4699                         if ((stcb != NULL) && (ret == 0)) {
4700                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4701                         }
4702                         if (locked_tcb) {
4703                                 SCTP_TCB_UNLOCK(locked_tcb);
4704                         }
4705                         return (NULL);
4706                         break;
4707                 case SCTP_SELECTIVE_ACK:
4708                         {
4709                                 struct sctp_sack_chunk *sack;
4710                                 int abort_now = 0;
4711                                 uint32_t a_rwnd, cum_ack;
4712                                 uint16_t num_seg, num_dup;
4713                                 uint8_t flags;
4714                                 int offset_seg, offset_dup;
4715
4716                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4717                                 SCTP_STAT_INCR(sctps_recvsacks);
4718                                 if (stcb == NULL) {
4719                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4720                                         break;
4721                                 }
4722                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4723                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4724                                         break;
4725                                 }
4726                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4727                                         /*-
4728                                          * If we have sent a shutdown-ack, we will pay no
4729                                          * attention to a sack sent in to us since
4730                                          * we don't care anymore.
4731                                          */
4732                                         break;
4733                                 }
4734                                 sack = (struct sctp_sack_chunk *)ch;
4735                                 flags = ch->chunk_flags;
4736                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4737                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4738                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4739                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4740                                 if (sizeof(struct sctp_sack_chunk) +
4741                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4742                                     num_dup * sizeof(uint32_t) != chk_length) {
4743                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4744                                         break;
4745                                 }
4746                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4747                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4748                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4749                                     cum_ack, num_seg, a_rwnd);
4750                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4751                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4752                                     (num_seg == 0) &&
4753                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4754                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4755                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4756                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4757                                     ) {
4758                                         /*
4759                                          * We have a SIMPLE sack having no
4760                                          * prior segments and data on sent
4761                                          * queue to be acked.. Use the
4762                                          * faster path sack processing. We
4763                                          * also allow window update sacks
4764                                          * with no missing segments to go
4765                                          * this way too.
4766                                          */
4767                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4768                                 } else {
4769                                         if (netp && *netp)
4770                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4771                                                     num_seg, 0, num_dup, &abort_now, flags,
4772                                                     cum_ack, a_rwnd, ecne_seen);
4773                                 }
4774                                 if (abort_now) {
4775                                         /* ABORT signal from sack processing */
4776                                         *offset = length;
4777                                         return (NULL);
4778                                 }
4779                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4780                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4781                                     (stcb->asoc.stream_queue_cnt == 0)) {
4782                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4783                                 }
4784                         }
4785                         break;
4786                         /*
4787                          * EY - nr_sack:  If the received chunk is an
4788                          * nr_sack chunk
4789                          */
4790                 case SCTP_NR_SELECTIVE_ACK:
4791                         {
4792                                 struct sctp_nr_sack_chunk *nr_sack;
4793                                 int abort_now = 0;
4794                                 uint32_t a_rwnd, cum_ack;
4795                                 uint16_t num_seg, num_nr_seg, num_dup;
4796                                 uint8_t flags;
4797                                 int offset_seg, offset_dup;
4798
4799                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4800                                 SCTP_STAT_INCR(sctps_recvsacks);
4801                                 if (stcb == NULL) {
4802                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4803                                         break;
4804                                 }
4805                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4806                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4807                                         goto unknown_chunk;
4808                                 }
4809                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4810                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4811                                         break;
4812                                 }
4813                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4814                                         /*-
4815                                          * If we have sent a shutdown-ack, we will pay no
4816                                          * attention to a sack sent in to us since
4817                                          * we don't care anymore.
4818                                          */
4819                                         break;
4820                                 }
4821                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4822                                 flags = ch->chunk_flags;
4823                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4824                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4825                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4826                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4827                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4828                                 if (sizeof(struct sctp_nr_sack_chunk) +
4829                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4830                                     num_dup * sizeof(uint32_t) != chk_length) {
4831                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4832                                         break;
4833                                 }
4834                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4835                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4836                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4837                                     cum_ack, num_seg, a_rwnd);
4838                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4839                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4840                                     (num_seg == 0) && (num_nr_seg == 0) &&
4841                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4842                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4843                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4844                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4845                                         /*
4846                                          * We have a SIMPLE sack having no
4847                                          * prior segments and data on sent
4848                                          * queue to be acked. Use the faster
4849                                          * path sack processing. We also
4850                                          * allow window update sacks with no
4851                                          * missing segments to go this way
4852                                          * too.
4853                                          */
4854                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4855                                             &abort_now, ecne_seen);
4856                                 } else {
4857                                         if (netp && *netp)
4858                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4859                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4860                                                     cum_ack, a_rwnd, ecne_seen);
4861                                 }
4862                                 if (abort_now) {
4863                                         /* ABORT signal from sack processing */
4864                                         *offset = length;
4865                                         return (NULL);
4866                                 }
4867                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4868                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4869                                     (stcb->asoc.stream_queue_cnt == 0)) {
4870                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4871                                 }
4872                         }
4873                         break;
4874
4875                 case SCTP_HEARTBEAT_REQUEST:
4876                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4877                         if ((stcb) && netp && *netp) {
4878                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4879                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4880                                     chk_length, *netp);
4881
4882                                 /* He's alive so give him credit */
4883                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4884                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4885                                             stcb->asoc.overall_error_count,
4886                                             0,
4887                                             SCTP_FROM_SCTP_INPUT,
4888                                             __LINE__);
4889                                 }
4890                                 stcb->asoc.overall_error_count = 0;
4891                         }
4892                         break;
4893                 case SCTP_HEARTBEAT_ACK:
4894                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4895                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4896                                 /* Its not ours */
4897                                 *offset = length;
4898                                 if (locked_tcb) {
4899                                         SCTP_TCB_UNLOCK(locked_tcb);
4900                                 }
4901                                 return (NULL);
4902                         }
4903                         /* He's alive so give him credit */
4904                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4905                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4906                                     stcb->asoc.overall_error_count,
4907                                     0,
4908                                     SCTP_FROM_SCTP_INPUT,
4909                                     __LINE__);
4910                         }
4911                         stcb->asoc.overall_error_count = 0;
4912                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4913                         if (netp && *netp)
4914                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4915                                     stcb, *netp);
4916                         break;
4917                 case SCTP_ABORT_ASSOCIATION:
4918                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4919                             stcb);
4920                         if ((stcb) && netp && *netp)
4921                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4922                                     stcb, *netp);
4923                         *offset = length;
4924                         return (NULL);
4925                         break;
4926                 case SCTP_SHUTDOWN:
4927                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4928                             stcb);
4929                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4930                                 *offset = length;
4931                                 if (locked_tcb) {
4932                                         SCTP_TCB_UNLOCK(locked_tcb);
4933                                 }
4934                                 return (NULL);
4935                         }
4936                         if (netp && *netp) {
4937                                 int abort_flag = 0;
4938
4939                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4940                                     stcb, *netp, &abort_flag);
4941                                 if (abort_flag) {
4942                                         *offset = length;
4943                                         return (NULL);
4944                                 }
4945                         }
4946                         break;
4947                 case SCTP_SHUTDOWN_ACK:
4948                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4949                         if ((stcb) && (netp) && (*netp))
4950                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4951                         *offset = length;
4952                         return (NULL);
4953                         break;
4954
4955                 case SCTP_OPERATION_ERROR:
4956                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4957                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4958                                 *offset = length;
4959                                 return (NULL);
4960                         }
4961                         break;
4962                 case SCTP_COOKIE_ECHO:
4963                         SCTPDBG(SCTP_DEBUG_INPUT3,
4964                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4965                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4966                                 ;
4967                         } else {
4968                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4969                                         /* We are not interested anymore */
4970                         abend:
4971                                         if (stcb) {
4972                                                 SCTP_TCB_UNLOCK(stcb);
4973                                         }
4974                                         *offset = length;
4975                                         return (NULL);
4976                                 }
4977                         }
4978                         /*
4979                          * First are we accepting? We do this again here
4980                          * since it is possible that a previous endpoint WAS
4981                          * listening responded to a INIT-ACK and then
4982                          * closed. We opened and bound.. and are now no
4983                          * longer listening.
4984                          */
4985
4986                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
4987                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4988                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4989                                         struct mbuf *op_err;
4990
4991                                         op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
4992                                         sctp_abort_association(inp, stcb, m,
4993                                             iphlen, sh, op_err, vrf_id, port);
4994                                 }
4995                                 *offset = length;
4996                                 return (NULL);
4997                         } else {
4998                                 struct mbuf *ret_buf;
4999                                 struct sctp_inpcb *linp;
5000
5001                                 if (stcb) {
5002                                         linp = NULL;
5003                                 } else {
5004                                         linp = inp;
5005                                 }
5006
5007                                 if (linp) {
5008                                         SCTP_ASOC_CREATE_LOCK(linp);
5009                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5010                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5011                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5012                                                 goto abend;
5013                                         }
5014                                 }
5015                                 if (netp) {
5016                                         ret_buf =
5017                                             sctp_handle_cookie_echo(m, iphlen,
5018                                             *offset, sh,
5019                                             (struct sctp_cookie_echo_chunk *)ch,
5020                                             &inp, &stcb, netp,
5021                                             auth_skipped,
5022                                             auth_offset,
5023                                             auth_len,
5024                                             &locked_tcb,
5025                                             vrf_id,
5026                                             port);
5027                                 } else {
5028                                         ret_buf = NULL;
5029                                 }
5030                                 if (linp) {
5031                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5032                                 }
5033                                 if (ret_buf == NULL) {
5034                                         if (locked_tcb) {
5035                                                 SCTP_TCB_UNLOCK(locked_tcb);
5036                                         }
5037                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5038                                             "GAK, null buffer\n");
5039                                         *offset = length;
5040                                         return (NULL);
5041                                 }
5042                                 /* if AUTH skipped, see if it verified... */
5043                                 if (auth_skipped) {
5044                                         got_auth = 1;
5045                                         auth_skipped = 0;
5046                                 }
5047                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5048                                         /*
5049                                          * Restart the timer if we have
5050                                          * pending data
5051                                          */
5052                                         struct sctp_tmit_chunk *chk;
5053
5054                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5055                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5056                                 }
5057                         }
5058                         break;
5059                 case SCTP_COOKIE_ACK:
5060                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5061                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5062                                 if (locked_tcb) {
5063                                         SCTP_TCB_UNLOCK(locked_tcb);
5064                                 }
5065                                 return (NULL);
5066                         }
5067                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5068                                 /* We are not interested anymore */
5069                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5070                                         ;
5071                                 } else if (stcb) {
5072 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5073                                         so = SCTP_INP_SO(inp);
5074                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5075                                         SCTP_TCB_UNLOCK(stcb);
5076                                         SCTP_SOCKET_LOCK(so, 1);
5077                                         SCTP_TCB_LOCK(stcb);
5078                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5079 #endif
5080                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5081 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5082                                         SCTP_SOCKET_UNLOCK(so, 1);
5083 #endif
5084                                         *offset = length;
5085                                         return (NULL);
5086                                 }
5087                         }
5088                         /* He's alive so give him credit */
5089                         if ((stcb) && netp && *netp) {
5090                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5091                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5092                                             stcb->asoc.overall_error_count,
5093                                             0,
5094                                             SCTP_FROM_SCTP_INPUT,
5095                                             __LINE__);
5096                                 }
5097                                 stcb->asoc.overall_error_count = 0;
5098                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5099                         }
5100                         break;
5101                 case SCTP_ECN_ECHO:
5102                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5103                         /* He's alive so give him credit */
5104                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5105                                 /* Its not ours */
5106                                 if (locked_tcb) {
5107                                         SCTP_TCB_UNLOCK(locked_tcb);
5108                                 }
5109                                 *offset = length;
5110                                 return (NULL);
5111                         }
5112                         if (stcb) {
5113                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5114                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5115                                             stcb->asoc.overall_error_count,
5116                                             0,
5117                                             SCTP_FROM_SCTP_INPUT,
5118                                             __LINE__);
5119                                 }
5120                                 stcb->asoc.overall_error_count = 0;
5121                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5122                                     stcb);
5123                                 ecne_seen = 1;
5124                         }
5125                         break;
5126                 case SCTP_ECN_CWR:
5127                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5128                         /* He's alive so give him credit */
5129                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5130                                 /* Its not ours */
5131                                 if (locked_tcb) {
5132                                         SCTP_TCB_UNLOCK(locked_tcb);
5133                                 }
5134                                 *offset = length;
5135                                 return (NULL);
5136                         }
5137                         if (stcb) {
5138                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5139                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5140                                             stcb->asoc.overall_error_count,
5141                                             0,
5142                                             SCTP_FROM_SCTP_INPUT,
5143                                             __LINE__);
5144                                 }
5145                                 stcb->asoc.overall_error_count = 0;
5146                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5147                         }
5148                         break;
5149                 case SCTP_SHUTDOWN_COMPLETE:
5150                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5151                         /* must be first and only chunk */
5152                         if ((num_chunks > 1) ||
5153                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5154                                 *offset = length;
5155                                 if (locked_tcb) {
5156                                         SCTP_TCB_UNLOCK(locked_tcb);
5157                                 }
5158                                 return (NULL);
5159                         }
5160                         if ((stcb) && netp && *netp) {
5161                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5162                                     stcb, *netp);
5163                         }
5164                         *offset = length;
5165                         return (NULL);
5166                         break;
5167                 case SCTP_ASCONF:
5168                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5169                         /* He's alive so give him credit */
5170                         if (stcb) {
5171                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5172                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5173                                             stcb->asoc.overall_error_count,
5174                                             0,
5175                                             SCTP_FROM_SCTP_INPUT,
5176                                             __LINE__);
5177                                 }
5178                                 stcb->asoc.overall_error_count = 0;
5179                                 sctp_handle_asconf(m, *offset,
5180                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5181                                 asconf_cnt++;
5182                         }
5183                         break;
5184                 case SCTP_ASCONF_ACK:
5185                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5186                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5187                                 /* Its not ours */
5188                                 if (locked_tcb) {
5189                                         SCTP_TCB_UNLOCK(locked_tcb);
5190                                 }
5191                                 *offset = length;
5192                                 return (NULL);
5193                         }
5194                         if ((stcb) && netp && *netp) {
5195                                 /* He's alive so give him credit */
5196                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5197                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5198                                             stcb->asoc.overall_error_count,
5199                                             0,
5200                                             SCTP_FROM_SCTP_INPUT,
5201                                             __LINE__);
5202                                 }
5203                                 stcb->asoc.overall_error_count = 0;
5204                                 sctp_handle_asconf_ack(m, *offset,
5205                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5206                                 if (abort_no_unlock)
5207                                         return (NULL);
5208                         }
5209                         break;
5210                 case SCTP_FORWARD_CUM_TSN:
5211                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5212                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5213                                 /* Its not ours */
5214                                 if (locked_tcb) {
5215                                         SCTP_TCB_UNLOCK(locked_tcb);
5216                                 }
5217                                 *offset = length;
5218                                 return (NULL);
5219                         }
5220                         /* He's alive so give him credit */
5221                         if (stcb) {
5222                                 int abort_flag = 0;
5223
5224                                 stcb->asoc.overall_error_count = 0;
5225                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5226                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5227                                             stcb->asoc.overall_error_count,
5228                                             0,
5229                                             SCTP_FROM_SCTP_INPUT,
5230                                             __LINE__);
5231                                 }
5232                                 *fwd_tsn_seen = 1;
5233                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5234                                         /* We are not interested anymore */
5235 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5236                                         so = SCTP_INP_SO(inp);
5237                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5238                                         SCTP_TCB_UNLOCK(stcb);
5239                                         SCTP_SOCKET_LOCK(so, 1);
5240                                         SCTP_TCB_LOCK(stcb);
5241                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5242 #endif
5243                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5244 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5245                                         SCTP_SOCKET_UNLOCK(so, 1);
5246 #endif
5247                                         *offset = length;
5248                                         return (NULL);
5249                                 }
5250                                 sctp_handle_forward_tsn(stcb,
5251                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5252                                 if (abort_flag) {
5253                                         *offset = length;
5254                                         return (NULL);
5255                                 } else {
5256                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5257                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5258                                                     stcb->asoc.overall_error_count,
5259                                                     0,
5260                                                     SCTP_FROM_SCTP_INPUT,
5261                                                     __LINE__);
5262                                         }
5263                                         stcb->asoc.overall_error_count = 0;
5264                                 }
5265
5266                         }
5267                         break;
5268                 case SCTP_STREAM_RESET:
5269                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5270                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5271                                 /* Its not ours */
5272                                 if (locked_tcb) {
5273                                         SCTP_TCB_UNLOCK(locked_tcb);
5274                                 }
5275                                 *offset = length;
5276                                 return (NULL);
5277                         }
5278                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5279                                 /* We are not interested anymore */
5280 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5281                                 so = SCTP_INP_SO(inp);
5282                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5283                                 SCTP_TCB_UNLOCK(stcb);
5284                                 SCTP_SOCKET_LOCK(so, 1);
5285                                 SCTP_TCB_LOCK(stcb);
5286                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5287 #endif
5288                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5289 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5290                                 SCTP_SOCKET_UNLOCK(so, 1);
5291 #endif
5292                                 *offset = length;
5293                                 return (NULL);
5294                         }
5295                         if (stcb->asoc.peer_supports_strreset == 0) {
5296                                 /*
5297                                  * hmm, peer should have announced this, but
5298                                  * we will turn it on since he is sending us
5299                                  * a stream reset.
5300                                  */
5301                                 stcb->asoc.peer_supports_strreset = 1;
5302                         }
5303                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5304                                 /* stop processing */
5305                                 *offset = length;
5306                                 return (NULL);
5307                         }
5308                         break;
5309                 case SCTP_PACKET_DROPPED:
5310                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5311                         /* re-get it all please */
5312                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5313                                 /* Its not ours */
5314                                 if (locked_tcb) {
5315                                         SCTP_TCB_UNLOCK(locked_tcb);
5316                                 }
5317                                 *offset = length;
5318                                 return (NULL);
5319                         }
5320                         if (ch && (stcb) && netp && (*netp)) {
5321                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5322                                     stcb, *netp,
5323                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5324
5325                         }
5326                         break;
5327
5328                 case SCTP_AUTHENTICATION:
5329                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5330                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5331                                 goto unknown_chunk;
5332
5333                         if (stcb == NULL) {
5334                                 /* save the first AUTH for later processing */
5335                                 if (auth_skipped == 0) {
5336                                         auth_offset = *offset;
5337                                         auth_len = chk_length;
5338                                         auth_skipped = 1;
5339                                 }
5340                                 /* skip this chunk (temporarily) */
5341                                 goto next_chunk;
5342                         }
5343                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5344                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5345                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5346                                 /* Its not ours */
5347                                 if (locked_tcb) {
5348                                         SCTP_TCB_UNLOCK(locked_tcb);
5349                                 }
5350                                 *offset = length;
5351                                 return (NULL);
5352                         }
5353                         if (got_auth == 1) {
5354                                 /* skip this chunk... it's already auth'd */
5355                                 goto next_chunk;
5356                         }
5357                         got_auth = 1;
5358                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5359                             m, *offset)) {
5360                                 /* auth HMAC failed so dump the packet */
5361                                 *offset = length;
5362                                 return (stcb);
5363                         } else {
5364                                 /* remaining chunks are HMAC checked */
5365                                 stcb->asoc.authenticated = 1;
5366                         }
5367                         break;
5368
5369                 default:
5370         unknown_chunk:
5371                         /* it's an unknown chunk! */
5372                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5373                                 struct mbuf *mm;
5374                                 struct sctp_paramhdr *phd;
5375
5376                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5377                                     0, M_DONTWAIT, 1, MT_DATA);
5378                                 if (mm) {
5379                                         phd = mtod(mm, struct sctp_paramhdr *);
5380                                         /*
5381                                          * We cheat and use param type since
5382                                          * we did not bother to define a
5383                                          * error cause struct. They are the
5384                                          * same basic format with different
5385                                          * names.
5386                                          */
5387                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5388                                         phd->param_length = htons(chk_length + sizeof(*phd));
5389                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5390                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5391                                             M_DONTWAIT);
5392                                         if (SCTP_BUF_NEXT(mm)) {
5393 #ifdef SCTP_MBUF_LOGGING
5394                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5395                                                         struct mbuf *mat;
5396
5397                                                         mat = SCTP_BUF_NEXT(mm);
5398                                                         while (mat) {
5399                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5400                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5401                                                                 }
5402                                                                 mat = SCTP_BUF_NEXT(mat);
5403                                                         }
5404                                                 }
5405 #endif
5406                                                 sctp_queue_op_err(stcb, mm);
5407                                         } else {
5408                                                 sctp_m_freem(mm);
5409                                         }
5410                                 }
5411                         }
5412                         if ((ch->chunk_type & 0x80) == 0) {
5413                                 /* discard this packet */
5414                                 *offset = length;
5415                                 return (stcb);
5416                         }       /* else skip this bad chunk and continue... */
5417                         break;
5418                 }               /* switch (ch->chunk_type) */
5419
5420
5421 next_chunk:
5422                 /* get the next chunk */
5423                 *offset += SCTP_SIZE32(chk_length);
5424                 if (*offset >= length) {
5425                         /* no more data left in the mbuf chain */
5426                         break;
5427                 }
5428                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5429                     sizeof(struct sctp_chunkhdr), chunk_buf);
5430                 if (ch == NULL) {
5431                         if (locked_tcb) {
5432                                 SCTP_TCB_UNLOCK(locked_tcb);
5433                         }
5434                         *offset = length;
5435                         return (NULL);
5436                 }
5437         }                       /* while */
5438
5439         if (asconf_cnt > 0 && stcb != NULL) {
5440                 sctp_send_asconf_ack(stcb);
5441         }
5442         return (stcb);
5443 }
5444
5445
5446 #ifdef INVARIANTS
5447 #ifdef __GNUC__
5448 __attribute__((noinline))
5449 #endif
5450         void
5451              sctp_validate_no_locks(struct sctp_inpcb *inp)
5452 {
5453         struct sctp_tcb *lstcb;
5454
5455         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5456                 if (mtx_owned(&lstcb->tcb_mtx)) {
5457                         panic("Own lock on stcb at return from input");
5458                 }
5459         }
5460         if (mtx_owned(&inp->inp_create_mtx)) {
5461                 panic("Own create lock on inp");
5462         }
5463         if (mtx_owned(&inp->inp_mtx)) {
5464                 panic("Own inp lock on inp");
5465         }
5466 }
5467
5468 #endif
5469
5470 /*
5471  * common input chunk processing (v4 and v6)
5472  */
5473 void
5474 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5475     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5476     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5477     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5478 {
5479         /*
5480          * Control chunk processing
5481          */
5482         uint32_t high_tsn;
5483         int fwd_tsn_seen = 0, data_processed = 0;
5484         struct mbuf *m = *mm;
5485         int un_sent;
5486         int cnt_ctrl_ready = 0;
5487
5488         SCTP_STAT_INCR(sctps_recvdatagrams);
5489 #ifdef SCTP_AUDITING_ENABLED
5490         sctp_audit_log(0xE0, 1);
5491         sctp_auditing(0, inp, stcb, net);
5492 #endif
5493
5494         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5495             m, iphlen, offset, length, stcb);
5496         if (stcb) {
5497                 /* always clear this before beginning a packet */
5498                 stcb->asoc.authenticated = 0;
5499                 stcb->asoc.seen_a_sack_this_pkt = 0;
5500                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5501                     stcb, stcb->asoc.state);
5502
5503                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5504                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5505                         /*-
5506                          * If we hit here, we had a ref count
5507                          * up when the assoc was aborted and the
5508                          * timer is clearing out the assoc, we should
5509                          * NOT respond to any packet.. its OOTB.
5510                          */
5511                         SCTP_TCB_UNLOCK(stcb);
5512                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5513                             vrf_id, port);
5514                         goto out_now;
5515                 }
5516         }
5517         if (IS_SCTP_CONTROL(ch)) {
5518                 /* process the control portion of the SCTP packet */
5519                 /* sa_ignore NO_NULL_CHK */
5520                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5521                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5522                 if (stcb) {
5523                         /*
5524                          * This covers us if the cookie-echo was there and
5525                          * it changes our INP.
5526                          */
5527                         inp = stcb->sctp_ep;
5528                         if ((net) && (port)) {
5529                                 if (net->port == 0) {
5530                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5531                                 }
5532                                 net->port = port;
5533                         }
5534                 }
5535         } else {
5536                 /*
5537                  * no control chunks, so pre-process DATA chunks (these
5538                  * checks are taken care of by control processing)
5539                  */
5540
5541                 /*
5542                  * if DATA only packet, and auth is required, then punt...
5543                  * can't have authenticated without any AUTH (control)
5544                  * chunks
5545                  */
5546                 if ((stcb != NULL) &&
5547                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5548                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5549                         /* "silently" ignore */
5550                         SCTP_STAT_INCR(sctps_recvauthmissing);
5551                         SCTP_TCB_UNLOCK(stcb);
5552                         goto out_now;
5553                 }
5554                 if (stcb == NULL) {
5555                         /* out of the blue DATA chunk */
5556                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5557                             vrf_id, port);
5558                         goto out_now;
5559                 }
5560                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5561                         /* v_tag mismatch! */
5562                         SCTP_STAT_INCR(sctps_badvtag);
5563                         SCTP_TCB_UNLOCK(stcb);
5564                         goto out_now;
5565                 }
5566         }
5567
5568         if (stcb == NULL) {
5569                 /*
5570                  * no valid TCB for this packet, or we found it's a bad
5571                  * packet while processing control, or we're done with this
5572                  * packet (done or skip rest of data), so we drop it...
5573                  */
5574                 goto out_now;
5575         }
5576         /*
5577          * DATA chunk processing
5578          */
5579         /* plow through the data chunks while length > offset */
5580
5581         /*
5582          * Rest should be DATA only.  Check authentication state if AUTH for
5583          * DATA is required.
5584          */
5585         if ((length > offset) &&
5586             (stcb != NULL) &&
5587             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5588             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5589             !stcb->asoc.authenticated) {
5590                 /* "silently" ignore */
5591                 SCTP_STAT_INCR(sctps_recvauthmissing);
5592                 SCTPDBG(SCTP_DEBUG_AUTH1,
5593                     "Data chunk requires AUTH, skipped\n");
5594                 goto trigger_send;
5595         }
5596         if (length > offset) {
5597                 int retval;
5598
5599                 /*
5600                  * First check to make sure our state is correct. We would
5601                  * not get here unless we really did have a tag, so we don't
5602                  * abort if this happens, just dump the chunk silently.
5603                  */
5604                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5605                 case SCTP_STATE_COOKIE_ECHOED:
5606                         /*
5607                          * we consider data with valid tags in this state
5608                          * shows us the cookie-ack was lost. Imply it was
5609                          * there.
5610                          */
5611                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5612                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5613                                     stcb->asoc.overall_error_count,
5614                                     0,
5615                                     SCTP_FROM_SCTP_INPUT,
5616                                     __LINE__);
5617                         }
5618                         stcb->asoc.overall_error_count = 0;
5619                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5620                         break;
5621                 case SCTP_STATE_COOKIE_WAIT:
5622                         /*
5623                          * We consider OOTB any data sent during asoc setup.
5624                          */
5625                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5626                             vrf_id, port);
5627                         SCTP_TCB_UNLOCK(stcb);
5628                         goto out_now;
5629                         /* sa_ignore NOTREACHED */
5630                         break;
5631                 case SCTP_STATE_EMPTY:  /* should not happen */
5632                 case SCTP_STATE_INUSE:  /* should not happen */
5633                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5634                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5635                 default:
5636                         SCTP_TCB_UNLOCK(stcb);
5637                         goto out_now;
5638                         /* sa_ignore NOTREACHED */
5639                         break;
5640                 case SCTP_STATE_OPEN:
5641                 case SCTP_STATE_SHUTDOWN_SENT:
5642                         break;
5643                 }
5644                 /* plow through the data chunks while length > offset */
5645                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5646                     inp, stcb, net, &high_tsn);
5647                 if (retval == 2) {
5648                         /*
5649                          * The association aborted, NO UNLOCK needed since
5650                          * the association is destroyed.
5651                          */
5652                         goto out_now;
5653                 }
5654                 data_processed = 1;
5655                 /*
5656                  * Anything important needs to have been m_copy'ed in
5657                  * process_data
5658                  */
5659         }
5660         /* take care of ecn */
5661         if ((data_processed == 1) &&
5662             (stcb->asoc.ecn_allowed == 1) &&
5663             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5664                 /* Yep, we need to add a ECNE */
5665                 sctp_send_ecn_echo(stcb, net, high_tsn);
5666         }
5667         if ((data_processed == 0) && (fwd_tsn_seen)) {
5668                 int was_a_gap;
5669                 uint32_t highest_tsn;
5670
5671                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5672                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5673                 } else {
5674                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5675                 }
5676                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5677                 stcb->asoc.send_sack = 1;
5678                 sctp_sack_check(stcb, was_a_gap);
5679         } else if (fwd_tsn_seen) {
5680                 stcb->asoc.send_sack = 1;
5681         }
5682         /* trigger send of any chunks in queue... */
5683 trigger_send:
5684 #ifdef SCTP_AUDITING_ENABLED
5685         sctp_audit_log(0xE0, 2);
5686         sctp_auditing(1, inp, stcb, net);
5687 #endif
5688         SCTPDBG(SCTP_DEBUG_INPUT1,
5689             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5690             stcb->asoc.peers_rwnd,
5691             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5692             stcb->asoc.total_flight);
5693         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5694         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5695                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5696         }
5697         if (cnt_ctrl_ready ||
5698             ((un_sent) &&
5699             (stcb->asoc.peers_rwnd > 0 ||
5700             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5701                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5702                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5703                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5704         }
5705 #ifdef SCTP_AUDITING_ENABLED
5706         sctp_audit_log(0xE0, 3);
5707         sctp_auditing(2, inp, stcb, net);
5708 #endif
5709         SCTP_TCB_UNLOCK(stcb);
5710 out_now:
5711 #ifdef INVARIANTS
5712         sctp_validate_no_locks(inp);
5713 #endif
5714         return;
5715 }
5716
5717 #if 0
5718 static void
5719 sctp_print_mbuf_chain(struct mbuf *m)
5720 {
5721         for (; m; m = SCTP_BUF_NEXT(m)) {
5722                 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5723                 if (SCTP_BUF_IS_EXTENDED(m))
5724                         printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5725         }
5726 }
5727
5728 #endif
5729
5730 #ifdef INET
5731 void
5732 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5733 {
5734 #ifdef SCTP_MBUF_LOGGING
5735         struct mbuf *mat;
5736
5737 #endif
5738         struct mbuf *m;
5739         int iphlen;
5740         uint32_t vrf_id = 0;
5741         uint8_t ecn_bits;
5742         struct ip *ip;
5743         struct sctphdr *sh;
5744         struct sctp_inpcb *inp = NULL;
5745         struct sctp_nets *net;
5746         struct sctp_tcb *stcb = NULL;
5747         struct sctp_chunkhdr *ch;
5748         int refcount_up = 0;
5749         int length, mlen, offset;
5750
5751 #if !defined(SCTP_WITH_NO_CSUM)
5752         uint32_t check, calc_check;
5753
5754 #endif
5755
5756         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5757                 SCTP_RELEASE_PKT(i_pak);
5758                 return;
5759         }
5760         mlen = SCTP_HEADER_LEN(i_pak);
5761         iphlen = off;
5762         m = SCTP_HEADER_TO_CHAIN(i_pak);
5763
5764         net = NULL;
5765         SCTP_STAT_INCR(sctps_recvpackets);
5766         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5767
5768
5769 #ifdef SCTP_MBUF_LOGGING
5770         /* Log in any input mbufs */
5771         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5772                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
5773                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5774                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5775                         }
5776                 }
5777         }
5778 #endif
5779 #ifdef  SCTP_PACKET_LOGGING
5780         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5781                 sctp_packet_log(m, mlen);
5782 #endif
5783         /*
5784          * Must take out the iphlen, since mlen expects this (only effect lb
5785          * case)
5786          */
5787         mlen -= iphlen;
5788
5789         /*
5790          * Get IP, SCTP, and first chunk header together in first mbuf.
5791          */
5792         ip = mtod(m, struct ip *);
5793         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5794         if (SCTP_BUF_LEN(m) < offset) {
5795                 if ((m = m_pullup(m, offset)) == 0) {
5796                         SCTP_STAT_INCR(sctps_hdrops);
5797                         return;
5798                 }
5799                 ip = mtod(m, struct ip *);
5800         }
5801         /* validate mbuf chain length with IP payload length */
5802         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5803                 SCTP_STAT_INCR(sctps_hdrops);
5804                 goto bad;
5805         }
5806         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5807         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5808         SCTPDBG(SCTP_DEBUG_INPUT1,
5809             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5810
5811         /* SCTP does not allow broadcasts or multicasts */
5812         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5813                 goto bad;
5814         }
5815         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5816                 /*
5817                  * We only look at broadcast if its a front state, All
5818                  * others we will not have a tcb for anyway.
5819                  */
5820                 goto bad;
5821         }
5822         /* validate SCTP checksum */
5823         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5824             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5825             m->m_pkthdr.len,
5826             if_name(m->m_pkthdr.rcvif),
5827             m->m_pkthdr.csum_flags);
5828 #if defined(SCTP_WITH_NO_CSUM)
5829         SCTP_STAT_INCR(sctps_recvnocrc);
5830 #else
5831         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5832                 SCTP_STAT_INCR(sctps_recvhwcrc);
5833                 goto sctp_skip_csum_4;
5834         }
5835         check = sh->checksum;   /* save incoming checksum */
5836         sh->checksum = 0;       /* prepare for calc */
5837         calc_check = sctp_calculate_cksum(m, iphlen);
5838         sh->checksum = check;
5839         SCTP_STAT_INCR(sctps_recvswcrc);
5840         if (calc_check != check) {
5841                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5842                     calc_check, check, m, mlen, iphlen);
5843
5844                 stcb = sctp_findassociation_addr(m,
5845                     offset - sizeof(*ch),
5846                     sh, ch, &inp, &net,
5847                     vrf_id);
5848                 if ((net) && (port)) {
5849                         if (net->port == 0) {
5850                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5851                         }
5852                         net->port = port;
5853                 }
5854                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5855                         net->flowid = m->m_pkthdr.flowid;
5856 #ifdef INVARIANTS
5857                         net->flowidset = 1;
5858 #endif
5859                 }
5860                 if ((inp) && (stcb)) {
5861                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5862                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5863                 } else if ((inp != NULL) && (stcb == NULL)) {
5864                         refcount_up = 1;
5865                 }
5866                 SCTP_STAT_INCR(sctps_badsum);
5867                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5868                 goto bad;
5869         }
5870 sctp_skip_csum_4:
5871 #endif
5872         /* destination port of 0 is illegal, based on RFC2960. */
5873         if (sh->dest_port == 0) {
5874                 SCTP_STAT_INCR(sctps_hdrops);
5875                 goto bad;
5876         }
5877         /*
5878          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5879          * IP/SCTP/first chunk header...
5880          */
5881         stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
5882             sh, ch, &inp, &net, vrf_id);
5883         if ((net) && (port)) {
5884                 if (net->port == 0) {
5885                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5886                 }
5887                 net->port = port;
5888         }
5889         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5890                 net->flowid = m->m_pkthdr.flowid;
5891 #ifdef INVARIANTS
5892                 net->flowidset = 1;
5893 #endif
5894         }
5895         /* inp's ref-count increased && stcb locked */
5896         if (inp == NULL) {
5897                 struct sctp_init_chunk *init_chk, chunk_buf;
5898
5899                 SCTP_STAT_INCR(sctps_noport);
5900 #ifdef ICMP_BANDLIM
5901                 /*
5902                  * we use the bandwidth limiting to protect against sending
5903                  * too many ABORTS all at once. In this case these count the
5904                  * same as an ICMP message.
5905                  */
5906                 if (badport_bandlim(0) < 0)
5907                         goto bad;
5908 #endif                          /* ICMP_BANDLIM */
5909                 SCTPDBG(SCTP_DEBUG_INPUT1,
5910                     "Sending a ABORT from packet entry!\n");
5911                 if (ch->chunk_type == SCTP_INITIATION) {
5912                         /*
5913                          * we do a trick here to get the INIT tag, dig in
5914                          * and get the tag from the INIT and put it in the
5915                          * common header.
5916                          */
5917                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5918                             iphlen + sizeof(*sh), sizeof(*init_chk),
5919                             (uint8_t *) & chunk_buf);
5920                         if (init_chk != NULL)
5921                                 sh->v_tag = init_chk->init.initiate_tag;
5922                 }
5923                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5924                         sctp_send_shutdown_complete2(m, sh, vrf_id, port);
5925                         goto bad;
5926                 }
5927                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5928                         goto bad;
5929                 }
5930                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5931                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5932                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5933                             (ch->chunk_type != SCTP_INIT))) {
5934                                 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5935                         }
5936                 }
5937                 goto bad;
5938         } else if (stcb == NULL) {
5939                 refcount_up = 1;
5940         }
5941 #ifdef IPSEC
5942         /*
5943          * I very much doubt any of the IPSEC stuff will work but I have no
5944          * idea, so I will leave it in place.
5945          */
5946         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5947                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5948                 SCTP_STAT_INCR(sctps_hdrops);
5949                 goto bad;
5950         }
5951 #endif                          /* IPSEC */
5952
5953         /*
5954          * common chunk processing
5955          */
5956         length = ip->ip_len + iphlen;
5957         offset -= sizeof(struct sctp_chunkhdr);
5958
5959         ecn_bits = ip->ip_tos;
5960
5961         /* sa_ignore NO_NULL_CHK */
5962         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
5963             inp, stcb, net, ecn_bits, vrf_id, port);
5964         /* inp's ref-count reduced && stcb unlocked */
5965         if (m) {
5966                 sctp_m_freem(m);
5967         }
5968         if ((inp) && (refcount_up)) {
5969                 /* reduce ref-count */
5970                 SCTP_INP_DECR_REF(inp);
5971         }
5972         return;
5973 bad:
5974         if (stcb) {
5975                 SCTP_TCB_UNLOCK(stcb);
5976         }
5977         if ((inp) && (refcount_up)) {
5978                 /* reduce ref-count */
5979                 SCTP_INP_DECR_REF(inp);
5980         }
5981         if (m) {
5982                 sctp_m_freem(m);
5983         }
5984         return;
5985 }
5986
5987 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5988 extern int *sctp_cpuarry;
5989
5990 #endif
5991
5992 void
5993 sctp_input(struct mbuf *m, int off)
5994 {
5995 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5996         struct ip *ip;
5997         struct sctphdr *sh;
5998         int offset;
5999         int cpu_to_use;
6000         uint32_t flowid, tag;
6001
6002         if (mp_ncpus > 1) {
6003                 if (m->m_flags & M_FLOWID) {
6004                         flowid = m->m_pkthdr.flowid;
6005                 } else {
6006                         /*
6007                          * No flow id built by lower layers fix it so we
6008                          * create one.
6009                          */
6010                         ip = mtod(m, struct ip *);
6011                         offset = off + sizeof(*sh);
6012                         if (SCTP_BUF_LEN(m) < offset) {
6013                                 if ((m = m_pullup(m, offset)) == 0) {
6014                                         SCTP_STAT_INCR(sctps_hdrops);
6015                                         return;
6016                                 }
6017                                 ip = mtod(m, struct ip *);
6018                         }
6019                         sh = (struct sctphdr *)((caddr_t)ip + off);
6020                         tag = htonl(sh->v_tag);
6021                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6022                         m->m_pkthdr.flowid = flowid;
6023                         m->m_flags |= M_FLOWID;
6024                 }
6025                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6026                 sctp_queue_to_mcore(m, off, cpu_to_use);
6027                 return;
6028         }
6029 #endif
6030         sctp_input_with_port(m, off, 0);
6031 }
6032
6033 #endif