sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $   */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #include <netinet/udp.h>
  51
  52
  53
  54 static void
  55 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  56 {
  57         struct sctp_nets *net;
  58
  59         /*
  60          * This now not only stops all cookie timers it also stops any INIT
  61          * timers as well. This will make sure that the timers are stopped
  62          * in all collision cases.
  63          */
  64         SCTP_TCB_LOCK_ASSERT(stcb);
  65         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  66                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  67                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  68                             stcb->sctp_ep,
  69                             stcb,
  70                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  71                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  72                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  73                             stcb->sctp_ep,
  74                             stcb,
  75                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  76                 }
  77         }
  78 }
  79
  80 /* INIT handler */
  81 static void
  82 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
  83     struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  84     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
  85 {
  86         struct sctp_init *init;
  87         struct mbuf *op_err;
  88         uint32_t init_limit;
  89
  90         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  91             stcb);
  92         if (stcb == NULL) {
  93                 SCTP_INP_RLOCK(inp);
  94                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
  95                         goto outnow;
  96                 }
  97         }
  98         op_err = NULL;
  99         init = &cp->init;
 100         /* First are we accepting? */
 101         if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
 102                 SCTPDBG(SCTP_DEBUG_INPUT2,
 103                     "sctp_handle_init: Abort, so_qlimit:%d\n",
 104                     inp->sctp_socket->so_qlimit);
 105                 /*
 106                  * FIX ME ?? What about TCP model and we have a
 107                  * match/restart case? Actually no fix is needed. the lookup
 108                  * will always find the existing assoc so stcb would not be
 109                  * NULL. It may be questionable to do this since we COULD
 110                  * just send back the INIT-ACK and hope that the app did
 111                  * accept()'s by the time the COOKIE was sent. But there is
 112                  * a price to pay for COOKIE generation and I don't want to
 113                  * pay it on the chance that the app will actually do some
 114                  * accepts(). The App just looses and should NOT be in this
 115                  * state :-)
 116                  */
 117                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 118                     vrf_id, port);
 119                 if (stcb)
 120                         *abort_no_unlock = 1;
 121                 goto outnow;
 122         }
 123         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 124                 /* Invalid length */
 125                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 126                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         /* validate parameters */
 133         if (init->initiate_tag == 0) {
 134                 /* protocol error... send abort */
 135                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 136                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 143                 /* invalid parameter... send abort */
 144                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 145                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 146                     vrf_id, port);
 147                 if (stcb)
 148                         *abort_no_unlock = 1;
 149                 goto outnow;
 150         }
 151         if (init->num_inbound_streams == 0) {
 152                 /* protocol error... send abort */
 153                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 154                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 155                     vrf_id, port);
 156                 if (stcb)
 157                         *abort_no_unlock = 1;
 158                 goto outnow;
 159         }
 160         if (init->num_outbound_streams == 0) {
 161                 /* protocol error... send abort */
 162                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 163                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 164                     vrf_id, port);
 165                 if (stcb)
 166                         *abort_no_unlock = 1;
 167                 goto outnow;
 168         }
 169         init_limit = offset + ntohs(cp->ch.chunk_length);
 170         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 171             init_limit)) {
 172                 /* auth parameter(s) error... send abort */
 173                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
 174                 if (stcb)
 175                         *abort_no_unlock = 1;
 176                 goto outnow;
 177         }
 178         /* send an INIT-ACK w/cookie */
 179         SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 180         sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
 181             ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 182 outnow:
 183         if (stcb == NULL) {
 184                 SCTP_INP_RUNLOCK(inp);
 185         }
 186 }
 187
 188 /*
 189  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 190  */
 191
 192 int
 193 sctp_is_there_unsent_data(struct sctp_tcb *stcb)
 194 {
 195         int unsent_data = 0;
 196         unsigned int i;
 197         struct sctp_stream_queue_pending *sp;
 198         struct sctp_association *asoc;
 199
 200         /*
 201          * This function returns the number of streams that have true unsent
 202          * data on them. Note that as it looks through it will clean up any
 203          * places that have old data that has been sent but left at top of
 204          * stream queue.
 205          */
 206         asoc = &stcb->asoc;
 207         SCTP_TCB_SEND_LOCK(stcb);
 208         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 209                 /* Check to see if some data queued */
 210                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 211                         /* sa_ignore FREED_MEMORY */
 212                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 213                         if (sp == NULL) {
 214                                 continue;
 215                         }
 216                         if ((sp->msg_is_complete) &&
 217                             (sp->length == 0) &&
 218                             (sp->sender_all_done)) {
 219                                 /*
 220                                  * We are doing differed cleanup. Last time
 221                                  * through when we took all the data the
 222                                  * sender_all_done was not set.
 223                                  */
 224                                 if (sp->put_last_out == 0) {
 225                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 226                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 227                                             sp->sender_all_done,
 228                                             sp->length,
 229                                             sp->msg_is_complete,
 230                                             sp->put_last_out);
 231                                 }
 232                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 233                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 234                                 if (sp->net) {
 235                                         sctp_free_remote_addr(sp->net);
 236                                         sp->net = NULL;
 237                                 }
 238                                 if (sp->data) {
 239                                         sctp_m_freem(sp->data);
 240                                         sp->data = NULL;
 241                                 }
 242                                 sctp_free_a_strmoq(stcb, sp);
 243                         } else {
 244                                 unsent_data++;
 245                                 break;
 246                         }
 247                 }
 248         }
 249         SCTP_TCB_SEND_UNLOCK(stcb);
 250         return (unsent_data);
 251 }
 252
 253 static int
 254 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
 255     struct sctp_nets *net)
 256 {
 257         struct sctp_init *init;
 258         struct sctp_association *asoc;
 259         struct sctp_nets *lnet;
 260         unsigned int i;
 261
 262         init = &cp->init;
 263         asoc = &stcb->asoc;
 264         /* save off parameters */
 265         asoc->peer_vtag = ntohl(init->initiate_tag);
 266         asoc->peers_rwnd = ntohl(init->a_rwnd);
 267         /* init tsn's */
 268         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 269
 270         if (!TAILQ_EMPTY(&asoc->nets)) {
 271                 /* update any ssthresh's that may have a default */
 272                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 273                         lnet->ssthresh = asoc->peers_rwnd;
 274                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 275                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 276                         }
 277                 }
 278         }
 279         SCTP_TCB_SEND_LOCK(stcb);
 280         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 281                 unsigned int newcnt;
 282                 struct sctp_stream_out *outs;
 283                 struct sctp_stream_queue_pending *sp, *nsp;
 284                 struct sctp_tmit_chunk *chk, *nchk;
 285
 286                 /* abandon the upper streams */
 287                 newcnt = ntohs(init->num_inbound_streams);
 288                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 289                         if (chk->rec.data.stream_number >= newcnt) {
 290                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 291                                 asoc->send_queue_cnt--;
 292                                 if (chk->data != NULL) {
 293                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 294                                         sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
 295                                             SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED);
 296                                         if (chk->data) {
 297                                                 sctp_m_freem(chk->data);
 298                                                 chk->data = NULL;
 299                                         }
 300                                 }
 301                                 sctp_free_a_chunk(stcb, chk);
 302                                 /* sa_ignore FREED_MEMORY */
 303                         }
 304                 }
 305                 if (asoc->strmout) {
 306                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 307                                 outs = &asoc->strmout[i];
 308                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 309                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 310                                         asoc->stream_queue_cnt--;
 311                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 312                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
 313                                             sp, SCTP_SO_NOT_LOCKED);
 314                                         if (sp->data) {
 315                                                 sctp_m_freem(sp->data);
 316                                                 sp->data = NULL;
 317                                         }
 318                                         if (sp->net) {
 319                                                 sctp_free_remote_addr(sp->net);
 320                                                 sp->net = NULL;
 321                                         }
 322                                         /* Free the chunk */
 323                                         sctp_free_a_strmoq(stcb, sp);
 324                                         /* sa_ignore FREED_MEMORY */
 325                                 }
 326                         }
 327                 }
 328                 /* cut back the count */
 329                 asoc->pre_open_streams = newcnt;
 330         }
 331         SCTP_TCB_SEND_UNLOCK(stcb);
 332         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 333
 334         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 335         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 336         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 337                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 338         }
 339         /* This is the next one we expect */
 340         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 341
 342         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 343         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 344
 345         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 346         /* open the requested streams */
 347
 348         if (asoc->strmin != NULL) {
 349                 /* Free the old ones */
 350                 struct sctp_queued_to_read *ctl, *nctl;
 351
 352                 for (i = 0; i < asoc->streamincnt; i++) {
 353                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 354                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 355                                 sctp_free_remote_addr(ctl->whoFrom);
 356                                 ctl->whoFrom = NULL;
 357                                 sctp_m_freem(ctl->data);
 358                                 ctl->data = NULL;
 359                                 sctp_free_a_readq(stcb, ctl);
 360                         }
 361                 }
 362                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 363         }
 364         asoc->streamincnt = ntohs(init->num_outbound_streams);
 365         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 366                 asoc->streamincnt = MAX_SCTP_STREAMS;
 367         }
 368         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 369             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 370         if (asoc->strmin == NULL) {
 371                 /* we didn't get memory for the streams! */
 372                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 373                 return (-1);
 374         }
 375         for (i = 0; i < asoc->streamincnt; i++) {
 376                 asoc->strmin[i].stream_no = i;
 377                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 378                 /*
 379                  * U-stream ranges will be set when the cookie is unpacked.
 380                  * Or for the INIT sender they are un set (if pr-sctp not
 381                  * supported) when the INIT-ACK arrives.
 382                  */
 383                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 384                 asoc->strmin[i].delivery_started = 0;
 385         }
 386         /*
 387          * load_address_from_init will put the addresses into the
 388          * association when the COOKIE is processed or the INIT-ACK is
 389          * processed. Both types of COOKIE's existing and new call this
 390          * routine. It will remove addresses that are no longer in the
 391          * association (for the restarting case where addresses are
 392          * removed). Up front when the INIT arrives we will discard it if it
 393          * is a restart and new addresses have been added.
 394          */
 395         /* sa_ignore MEMLEAK */
 396         return (0);
 397 }
 398
 399 /*
 400  * INIT-ACK message processing/consumption returns value < 0 on error
 401  */
 402 static int
 403 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 404     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 405     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 406 {
 407         struct sctp_association *asoc;
 408         struct mbuf *op_err;
 409         int retval, abort_flag;
 410         uint32_t initack_limit;
 411         int nat_friendly = 0;
 412
 413         /* First verify that we have no illegal param's */
 414         abort_flag = 0;
 415         op_err = NULL;
 416
 417         op_err = sctp_arethere_unrecognized_parameters(m,
 418             (offset + sizeof(struct sctp_init_chunk)),
 419             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 420         if (abort_flag) {
 421                 /* Send an abort and notify peer */
 422                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
 423                 *abort_no_unlock = 1;
 424                 return (-1);
 425         }
 426         asoc = &stcb->asoc;
 427         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 428         /* process the peer's parameters in the INIT-ACK */
 429         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
 430         if (retval < 0) {
 431                 return (retval);
 432         }
 433         initack_limit = offset + ntohs(cp->ch.chunk_length);
 434         /* load all addresses */
 435         if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
 436             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 437             NULL))) {
 438                 /* Huh, we should abort */
 439                 SCTPDBG(SCTP_DEBUG_INPUT1,
 440                     "Load addresses from INIT causes an abort %d\n",
 441                     retval);
 442                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 443                     NULL, 0, net->port);
 444                 *abort_no_unlock = 1;
 445                 return (-1);
 446         }
 447         /* if the peer doesn't support asconf, flush the asconf queue */
 448         if (asoc->peer_supports_asconf == 0) {
 449                 struct sctp_asconf_addr *param, *nparam;
 450
 451                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 452                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 453                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 454                 }
 455         }
 456         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 457             stcb->asoc.local_hmacs);
 458         if (op_err) {
 459                 sctp_queue_op_err(stcb, op_err);
 460                 /* queuing will steal away the mbuf chain to the out queue */
 461                 op_err = NULL;
 462         }
 463         /* extract the cookie and queue it to "echo" it back... */
 464         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 465                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 466                     stcb->asoc.overall_error_count,
 467                     0,
 468                     SCTP_FROM_SCTP_INPUT,
 469                     __LINE__);
 470         }
 471         stcb->asoc.overall_error_count = 0;
 472         net->error_count = 0;
 473
 474         /*
 475          * Cancel the INIT timer, We do this first before queueing the
 476          * cookie. We always cancel at the primary to assue that we are
 477          * canceling the timer started by the INIT which always goes to the
 478          * primary.
 479          */
 480         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 481             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 482
 483         /* calculate the RTO */
 484         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy);
 485
 486         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 487         if (retval < 0) {
 488                 /*
 489                  * No cookie, we probably should send a op error. But in any
 490                  * case if there is no cookie in the INIT-ACK, we can
 491                  * abandon the peer, its broke.
 492                  */
 493                 if (retval == -3) {
 494                         /* We abort with an error of missing mandatory param */
 495                         op_err =
 496                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 497                         if (op_err) {
 498                                 /*
 499                                  * Expand beyond to include the mandatory
 500                                  * param cookie
 501                                  */
 502                                 struct sctp_inv_mandatory_param *mp;
 503
 504                                 SCTP_BUF_LEN(op_err) =
 505                                     sizeof(struct sctp_inv_mandatory_param);
 506                                 mp = mtod(op_err,
 507                                     struct sctp_inv_mandatory_param *);
 508                                 /* Subtract the reserved param */
 509                                 mp->length =
 510                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 511                                 mp->num_param = htonl(1);
 512                                 mp->param = htons(SCTP_STATE_COOKIE);
 513                                 mp->resv = 0;
 514                         }
 515                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 516                             sh, op_err, 0, net->port);
 517                         *abort_no_unlock = 1;
 518                 }
 519                 return (retval);
 520         }
 521         return (0);
 522 }
 523
 524 static void
 525 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 526     struct sctp_tcb *stcb, struct sctp_nets *net)
 527 {
 528         struct sockaddr_storage store;
 529         struct sockaddr_in *sin;
 530         struct sockaddr_in6 *sin6;
 531         struct sctp_nets *r_net, *f_net;
 532         struct timeval tv;
 533         int req_prim = 0;
 534
 535         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 536                 /* Invalid length */
 537                 return;
 538         }
 539         sin = (struct sockaddr_in *)&store;
 540         sin6 = (struct sockaddr_in6 *)&store;
 541
 542         memset(&store, 0, sizeof(store));
 543         if (cp->heartbeat.hb_info.addr_family == AF_INET &&
 544             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 545                 sin->sin_family = cp->heartbeat.hb_info.addr_family;
 546                 sin->sin_len = cp->heartbeat.hb_info.addr_len;
 547                 sin->sin_port = stcb->rport;
 548                 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 549                     sizeof(sin->sin_addr));
 550         } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 &&
 551             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 552                 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 553                 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 554                 sin6->sin6_port = stcb->rport;
 555                 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 556                     sizeof(sin6->sin6_addr));
 557         } else {
 558                 return;
 559         }
 560         r_net = sctp_findnet(stcb, (struct sockaddr *)sin);
 561         if (r_net == NULL) {
 562                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 563                 return;
 564         }
 565         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 566             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 567             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 568                 /*
 569                  * If the its a HB and it's random value is correct when can
 570                  * confirm the destination.
 571                  */
 572                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 573                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 574                         stcb->asoc.primary_destination = r_net;
 575                         r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY;
 576                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 577                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 578                         if (f_net != r_net) {
 579                                 /*
 580                                  * first one on the list is NOT the primary
 581                                  * sctp_cmpaddr() is much more efficent if
 582                                  * the primary is the first on the list,
 583                                  * make it so.
 584                                  */
 585                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 586                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 587                         }
 588                         req_prim = 1;
 589                 }
 590                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 591                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 592         }
 593         r_net->error_count = 0;
 594         r_net->hb_responded = 1;
 595         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 596         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 597         if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
 598                 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
 599                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 600                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 601                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
 602                 /* now was it the primary? if so restore */
 603                 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
 604                         (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net);
 605                 }
 606         }
 607         /*
 608          * JRS 5/14/07 - If CMT PF is on and the destination is in PF state,
 609          * set the destination to active state and set the cwnd to one or
 610          * two MTU's based on whether PF1 or PF2 is being used. If a T3
 611          * timer is running, for the destination, stop the timer because a
 612          * PF-heartbeat was received.
 613          */
 614         if ((stcb->asoc.sctp_cmt_on_off > 0) &&
 615             (stcb->asoc.sctp_cmt_pf > 0) &&
 616             ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
 617                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 618                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 619                             stcb, net,
 620                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 621                 }
 622                 net->dest_state &= ~SCTP_ADDR_PF;
 623                 net->cwnd = net->mtu * stcb->asoc.sctp_cmt_pf;
 624                 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n",
 625                     net, net->cwnd);
 626         }
 627         /* Now lets do a RTO with this */
 628         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy);
 629         /* Mobility adaptation */
 630         if (req_prim) {
 631                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 632                     SCTP_MOBILITY_BASE) ||
 633                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 634                     SCTP_MOBILITY_FASTHANDOFF)) &&
 635                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 636                     SCTP_MOBILITY_PRIM_DELETED)) {
 637
 638                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 639                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 640                             SCTP_MOBILITY_FASTHANDOFF)) {
 641                                 sctp_assoc_immediate_retrans(stcb,
 642                                     stcb->asoc.primary_destination);
 643                         }
 644                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 645                             SCTP_MOBILITY_BASE)) {
 646                                 sctp_move_chunks_from_net(stcb,
 647                                     stcb->asoc.deleted_primary);
 648                         }
 649                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 650                             stcb->asoc.deleted_primary);
 651                 }
 652         }
 653 }
 654
 655 static int
 656 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 657 {
 658         /*
 659          * return 0 means we want you to proceed with the abort non-zero
 660          * means no abort processing
 661          */
 662         struct sctpasochead *head;
 663
 664         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 665                 /* generate a new vtag and send init */
 666                 LIST_REMOVE(stcb, sctp_asocs);
 667                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 668                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 669                 /*
 670                  * put it in the bucket in the vtag hash of assoc's for the
 671                  * system
 672                  */
 673                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 674                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 675                 return (1);
 676         }
 677         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 678                 /*
 679                  * treat like a case where the cookie expired i.e.: - dump
 680                  * current cookie. - generate a new vtag. - resend init.
 681                  */
 682                 /* generate a new vtag and send init */
 683                 LIST_REMOVE(stcb, sctp_asocs);
 684                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 685                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 686                 sctp_stop_all_cookie_timers(stcb);
 687                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 688                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 689                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 690                 /*
 691                  * put it in the bucket in the vtag hash of assoc's for the
 692                  * system
 693                  */
 694                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 695                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 696                 return (1);
 697         }
 698         return (0);
 699 }
 700
 701 static int
 702 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 703     struct sctp_nets *net)
 704 {
 705         /*
 706          * return 0 means we want you to proceed with the abort non-zero
 707          * means no abort processing
 708          */
 709         if (stcb->asoc.peer_supports_auth == 0) {
 710                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 711                 return (0);
 712         }
 713         sctp_asconf_send_nat_state_update(stcb, net);
 714         return (1);
 715 }
 716
 717
 718 static void
 719 sctp_handle_abort(struct sctp_abort_chunk *cp,
 720     struct sctp_tcb *stcb, struct sctp_nets *net)
 721 {
 722 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 723         struct socket *so;
 724
 725 #endif
 726         uint16_t len;
 727
 728         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 729         if (stcb == NULL)
 730                 return;
 731
 732         len = ntohs(cp->ch.chunk_length);
 733         if (len > sizeof(struct sctp_chunkhdr)) {
 734                 /*
 735                  * Need to check the cause codes for our two magic nat
 736                  * aborts which don't kill the assoc necessarily.
 737                  */
 738                 struct sctp_abort_chunk *cpnext;
 739                 struct sctp_missing_nat_state *natc;
 740                 uint16_t cause;
 741
 742                 cpnext = cp;
 743                 cpnext++;
 744                 natc = (struct sctp_missing_nat_state *)cpnext;
 745                 cause = ntohs(natc->cause);
 746                 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 747                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 748                             cp->ch.chunk_flags);
 749                         if (sctp_handle_nat_colliding_state(stcb)) {
 750                                 return;
 751                         }
 752                 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
 753                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 754                             cp->ch.chunk_flags);
 755                         if (sctp_handle_nat_missing_state(stcb, net)) {
 756                                 return;
 757                         }
 758                 }
 759         }
 760         /* stop any receive timers */
 761         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 762         /* notify user of the abort and clean up... */
 763         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 764         /* free the tcb */
 765 #if defined(SCTP_PANIC_ON_ABORT)
 766         printf("stcb:%p state:%d rport:%d net:%p\n",
 767             stcb, stcb->asoc.state, stcb->rport, net);
 768         if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 769                 panic("Received an ABORT");
 770         } else {
 771                 printf("No panic its in state %x closed\n", stcb->asoc.state);
 772         }
 773 #endif
 774         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 775         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 776             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 777                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 778         }
 779 #ifdef SCTP_ASOCLOG_OF_TSNS
 780         sctp_print_out_track_log(stcb);
 781 #endif
 782 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 783         so = SCTP_INP_SO(stcb->sctp_ep);
 784         atomic_add_int(&stcb->asoc.refcnt, 1);
 785         SCTP_TCB_UNLOCK(stcb);
 786         SCTP_SOCKET_LOCK(so, 1);
 787         SCTP_TCB_LOCK(stcb);
 788         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 789 #endif
 790         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 791         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 792             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 793 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 794         SCTP_SOCKET_UNLOCK(so, 1);
 795 #endif
 796         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 797 }
 798
 799 static void
 800 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 801     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 802 {
 803         struct sctp_association *asoc;
 804         int some_on_streamwheel;
 805
 806 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 807         struct socket *so;
 808
 809 #endif
 810
 811         SCTPDBG(SCTP_DEBUG_INPUT2,
 812             "sctp_handle_shutdown: handling SHUTDOWN\n");
 813         if (stcb == NULL)
 814                 return;
 815         asoc = &stcb->asoc;
 816         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 817             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 818                 return;
 819         }
 820         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 821                 /* Shutdown NOT the expected size */
 822                 return;
 823         } else {
 824                 sctp_update_acked(stcb, cp, net, abort_flag);
 825                 if (*abort_flag) {
 826                         return;
 827                 }
 828         }
 829         if (asoc->control_pdapi) {
 830                 /*
 831                  * With a normal shutdown we assume the end of last record.
 832                  */
 833                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 834                 asoc->control_pdapi->end_added = 1;
 835                 asoc->control_pdapi->pdapi_aborted = 1;
 836                 asoc->control_pdapi = NULL;
 837                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 838 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 839                 so = SCTP_INP_SO(stcb->sctp_ep);
 840                 atomic_add_int(&stcb->asoc.refcnt, 1);
 841                 SCTP_TCB_UNLOCK(stcb);
 842                 SCTP_SOCKET_LOCK(so, 1);
 843                 SCTP_TCB_LOCK(stcb);
 844                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 845                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 846                         /* assoc was freed while we were unlocked */
 847                         SCTP_SOCKET_UNLOCK(so, 1);
 848                         return;
 849                 }
 850 #endif
 851                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 852 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 853                 SCTP_SOCKET_UNLOCK(so, 1);
 854 #endif
 855         }
 856         /* goto SHUTDOWN_RECEIVED state to block new requests */
 857         if (stcb->sctp_socket) {
 858                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 859                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 860                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 861                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 862                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 863                         /*
 864                          * notify upper layer that peer has initiated a
 865                          * shutdown
 866                          */
 867                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 868
 869                         /* reset time */
 870                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 871                 }
 872         }
 873         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 874                 /*
 875                  * stop the shutdown timer, since we WILL move to
 876                  * SHUTDOWN-ACK-SENT.
 877                  */
 878                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 879         }
 880         /* Now is there unsent data on a stream somewhere? */
 881         some_on_streamwheel = sctp_is_there_unsent_data(stcb);
 882
 883         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 884             !TAILQ_EMPTY(&asoc->sent_queue) ||
 885             some_on_streamwheel) {
 886                 /* By returning we will push more data out */
 887                 return;
 888         } else {
 889                 /* no outstanding data to send, so move on... */
 890                 /* send SHUTDOWN-ACK */
 891                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 892                 /* move to SHUTDOWN-ACK-SENT state */
 893                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 894                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 895                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 896                 }
 897                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 898                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 899                 sctp_stop_timers_for_shutdown(stcb);
 900                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 901                     stcb, net);
 902         }
 903 }
 904
 905 static void
 906 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
 907     struct sctp_tcb *stcb,
 908     struct sctp_nets *net)
 909 {
 910         struct sctp_association *asoc;
 911
 912 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 913         struct socket *so;
 914
 915         so = SCTP_INP_SO(stcb->sctp_ep);
 916 #endif
 917         SCTPDBG(SCTP_DEBUG_INPUT2,
 918             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 919         if (stcb == NULL)
 920                 return;
 921
 922         asoc = &stcb->asoc;
 923         /* process according to association state */
 924         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 925             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 926                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 927                 sctp_send_shutdown_complete(stcb, net, 1);
 928                 SCTP_TCB_UNLOCK(stcb);
 929                 return;
 930         }
 931         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 932             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 933                 /* unexpected SHUTDOWN-ACK... so ignore... */
 934                 SCTP_TCB_UNLOCK(stcb);
 935                 return;
 936         }
 937         if (asoc->control_pdapi) {
 938                 /*
 939                  * With a normal shutdown we assume the end of last record.
 940                  */
 941                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 942                 asoc->control_pdapi->end_added = 1;
 943                 asoc->control_pdapi->pdapi_aborted = 1;
 944                 asoc->control_pdapi = NULL;
 945                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 946 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 947                 atomic_add_int(&stcb->asoc.refcnt, 1);
 948                 SCTP_TCB_UNLOCK(stcb);
 949                 SCTP_SOCKET_LOCK(so, 1);
 950                 SCTP_TCB_LOCK(stcb);
 951                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 952                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 953                         /* assoc was freed while we were unlocked */
 954                         SCTP_SOCKET_UNLOCK(so, 1);
 955                         return;
 956                 }
 957 #endif
 958                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 959 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 960                 SCTP_SOCKET_UNLOCK(so, 1);
 961 #endif
 962         }
 963         /* are the queues empty? */
 964         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 965             !TAILQ_EMPTY(&asoc->sent_queue) ||
 966             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 967                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
 968         }
 969         /* stop the timer */
 970         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 971         /* send SHUTDOWN-COMPLETE */
 972         sctp_send_shutdown_complete(stcb, net, 0);
 973         /* notify upper layer protocol */
 974         if (stcb->sctp_socket) {
 975                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 976                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 977                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 978                         /* Set the connected flag to disconnected */
 979                         stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
 980                 }
 981         }
 982         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 983         /* free the TCB but first save off the ep */
 984 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 985         atomic_add_int(&stcb->asoc.refcnt, 1);
 986         SCTP_TCB_UNLOCK(stcb);
 987         SCTP_SOCKET_LOCK(so, 1);
 988         SCTP_TCB_LOCK(stcb);
 989         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 990 #endif
 991         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 992             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 993 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 994         SCTP_SOCKET_UNLOCK(so, 1);
 995 #endif
 996 }
 997
 998 /*
 999  * Skip past the param header and then we will find the chunk that caused the
1000  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1001  * our peer must be broken.
1002  */
1003 static void
1004 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1005     struct sctp_nets *net)
1006 {
1007         struct sctp_chunkhdr *chk;
1008
1009         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1010         switch (chk->chunk_type) {
1011         case SCTP_ASCONF_ACK:
1012         case SCTP_ASCONF:
1013                 sctp_asconf_cleanup(stcb, net);
1014                 break;
1015         case SCTP_FORWARD_CUM_TSN:
1016                 stcb->asoc.peer_supports_prsctp = 0;
1017                 break;
1018         default:
1019                 SCTPDBG(SCTP_DEBUG_INPUT2,
1020                     "Peer does not support chunk type %d(%x)??\n",
1021                     chk->chunk_type, (uint32_t) chk->chunk_type);
1022                 break;
1023         }
1024 }
1025
1026 /*
1027  * Skip past the param header and then we will find the param that caused the
1028  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1029  * these will turn of specific features.
1030  */
1031 static void
1032 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1033 {
1034         struct sctp_paramhdr *pbad;
1035
1036         pbad = phdr + 1;
1037         switch (ntohs(pbad->param_type)) {
1038                 /* pr-sctp draft */
1039         case SCTP_PRSCTP_SUPPORTED:
1040                 stcb->asoc.peer_supports_prsctp = 0;
1041                 break;
1042         case SCTP_SUPPORTED_CHUNK_EXT:
1043                 break;
1044                 /* draft-ietf-tsvwg-addip-sctp */
1045         case SCTP_HAS_NAT_SUPPORT:
1046                 stcb->asoc.peer_supports_nat = 0;
1047                 break;
1048         case SCTP_ADD_IP_ADDRESS:
1049         case SCTP_DEL_IP_ADDRESS:
1050         case SCTP_SET_PRIM_ADDR:
1051                 stcb->asoc.peer_supports_asconf = 0;
1052                 break;
1053         case SCTP_SUCCESS_REPORT:
1054         case SCTP_ERROR_CAUSE_IND:
1055                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1056                 SCTPDBG(SCTP_DEBUG_INPUT2,
1057                     "Turning off ASCONF to this strange peer\n");
1058                 stcb->asoc.peer_supports_asconf = 0;
1059                 break;
1060         default:
1061                 SCTPDBG(SCTP_DEBUG_INPUT2,
1062                     "Peer does not support param type %d(%x)??\n",
1063                     pbad->param_type, (uint32_t) pbad->param_type);
1064                 break;
1065         }
1066 }
1067
1068 static int
1069 sctp_handle_error(struct sctp_chunkhdr *ch,
1070     struct sctp_tcb *stcb, struct sctp_nets *net)
1071 {
1072         int chklen;
1073         struct sctp_paramhdr *phdr;
1074         uint16_t error_type;
1075         uint16_t error_len;
1076         struct sctp_association *asoc;
1077         int adjust;
1078
1079 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1080         struct socket *so;
1081
1082 #endif
1083
1084         /* parse through all of the errors and process */
1085         asoc = &stcb->asoc;
1086         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1087             sizeof(struct sctp_chunkhdr));
1088         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1089         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1090                 /* Process an Error Cause */
1091                 error_type = ntohs(phdr->param_type);
1092                 error_len = ntohs(phdr->param_length);
1093                 if ((error_len > chklen) || (error_len == 0)) {
1094                         /* invalid param length for this param */
1095                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1096                             chklen, error_len);
1097                         return (0);
1098                 }
1099                 switch (error_type) {
1100                 case SCTP_CAUSE_INVALID_STREAM:
1101                 case SCTP_CAUSE_MISSING_PARAM:
1102                 case SCTP_CAUSE_INVALID_PARAM:
1103                 case SCTP_CAUSE_NO_USER_DATA:
1104                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1105                             error_type);
1106                         break;
1107                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1108                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1109                             ch->chunk_flags);
1110                         if (sctp_handle_nat_colliding_state(stcb)) {
1111                                 return (0);
1112                         }
1113                         break;
1114                 case SCTP_CAUSE_NAT_MISSING_STATE:
1115                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1116                             ch->chunk_flags);
1117                         if (sctp_handle_nat_missing_state(stcb, net)) {
1118                                 return (0);
1119                         }
1120                         break;
1121                 case SCTP_CAUSE_STALE_COOKIE:
1122                         /*
1123                          * We only act if we have echoed a cookie and are
1124                          * waiting.
1125                          */
1126                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1127                                 int *p;
1128
1129                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1130                                 /* Save the time doubled */
1131                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1132                                 asoc->stale_cookie_count++;
1133                                 if (asoc->stale_cookie_count >
1134                                     asoc->max_init_times) {
1135                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1136                                         /* now free the asoc */
1137 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1138                                         so = SCTP_INP_SO(stcb->sctp_ep);
1139                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1140                                         SCTP_TCB_UNLOCK(stcb);
1141                                         SCTP_SOCKET_LOCK(so, 1);
1142                                         SCTP_TCB_LOCK(stcb);
1143                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1144 #endif
1145                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1146                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1147 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1148                                         SCTP_SOCKET_UNLOCK(so, 1);
1149 #endif
1150                                         return (-1);
1151                                 }
1152                                 /* blast back to INIT state */
1153                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1154                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1155                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1156                                 sctp_stop_all_cookie_timers(stcb);
1157                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1158                         }
1159                         break;
1160                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1161                         /*
1162                          * Nothing we can do here, we don't do hostname
1163                          * addresses so if the peer does not like my IPv6
1164                          * (or IPv4 for that matter) it does not matter. If
1165                          * they don't support that type of address, they can
1166                          * NOT possibly get that packet type... i.e. with no
1167                          * IPv6 you can't recieve a IPv6 packet. so we can
1168                          * safely ignore this one. If we ever added support
1169                          * for HOSTNAME Addresses, then we would need to do
1170                          * something here.
1171                          */
1172                         break;
1173                 case SCTP_CAUSE_UNRECOG_CHUNK:
1174                         sctp_process_unrecog_chunk(stcb, phdr, net);
1175                         break;
1176                 case SCTP_CAUSE_UNRECOG_PARAM:
1177                         sctp_process_unrecog_param(stcb, phdr);
1178                         break;
1179                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1180                         /*
1181                          * We ignore this since the timer will drive out a
1182                          * new cookie anyway and there timer will drive us
1183                          * to send a SHUTDOWN_COMPLETE. We can't send one
1184                          * here since we don't have their tag.
1185                          */
1186                         break;
1187                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1188                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1189                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1190                         /*
1191                          * We should NOT get these here, but in a
1192                          * ASCONF-ACK.
1193                          */
1194                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1195                             error_type);
1196                         break;
1197                 case SCTP_CAUSE_OUT_OF_RESC:
1198                         /*
1199                          * And what, pray tell do we do with the fact that
1200                          * the peer is out of resources? Not really sure we
1201                          * could do anything but abort. I suspect this
1202                          * should have came WITH an abort instead of in a
1203                          * OP-ERROR.
1204                          */
1205                         break;
1206                 default:
1207                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1208                             error_type);
1209                         break;
1210                 }
1211                 adjust = SCTP_SIZE32(error_len);
1212                 chklen -= adjust;
1213                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1214         }
1215         return (0);
1216 }
1217
1218 static int
1219 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1220     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1221     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1222 {
1223         struct sctp_init_ack *init_ack;
1224         struct mbuf *op_err;
1225
1226         SCTPDBG(SCTP_DEBUG_INPUT2,
1227             "sctp_handle_init_ack: handling INIT-ACK\n");
1228
1229         if (stcb == NULL) {
1230                 SCTPDBG(SCTP_DEBUG_INPUT2,
1231                     "sctp_handle_init_ack: TCB is null\n");
1232                 return (-1);
1233         }
1234         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1235                 /* Invalid length */
1236                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1237                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1238                     op_err, 0, net->port);
1239                 *abort_no_unlock = 1;
1240                 return (-1);
1241         }
1242         init_ack = &cp->init;
1243         /* validate parameters */
1244         if (init_ack->initiate_tag == 0) {
1245                 /* protocol error... send an abort */
1246                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1247                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1248                     op_err, 0, net->port);
1249                 *abort_no_unlock = 1;
1250                 return (-1);
1251         }
1252         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1253                 /* protocol error... send an abort */
1254                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1255                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1256                     op_err, 0, net->port);
1257                 *abort_no_unlock = 1;
1258                 return (-1);
1259         }
1260         if (init_ack->num_inbound_streams == 0) {
1261                 /* protocol error... send an abort */
1262                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1263                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1264                     op_err, 0, net->port);
1265                 *abort_no_unlock = 1;
1266                 return (-1);
1267         }
1268         if (init_ack->num_outbound_streams == 0) {
1269                 /* protocol error... send an abort */
1270                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1271                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1272                     op_err, 0, net->port);
1273                 *abort_no_unlock = 1;
1274                 return (-1);
1275         }
1276         /* process according to association state... */
1277         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1278         case SCTP_STATE_COOKIE_WAIT:
1279                 /* this is the expected state for this chunk */
1280                 /* process the INIT-ACK parameters */
1281                 if (stcb->asoc.primary_destination->dest_state &
1282                     SCTP_ADDR_UNCONFIRMED) {
1283                         /*
1284                          * The primary is where we sent the INIT, we can
1285                          * always consider it confirmed when the INIT-ACK is
1286                          * returned. Do this before we load addresses
1287                          * though.
1288                          */
1289                         stcb->asoc.primary_destination->dest_state &=
1290                             ~SCTP_ADDR_UNCONFIRMED;
1291                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1292                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1293                 }
1294                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1295                     net, abort_no_unlock, vrf_id) < 0) {
1296                         /* error in parsing parameters */
1297                         return (-1);
1298                 }
1299                 /* update our state */
1300                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1301                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1302
1303                 /* reset the RTO calc */
1304                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1305                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1306                             stcb->asoc.overall_error_count,
1307                             0,
1308                             SCTP_FROM_SCTP_INPUT,
1309                             __LINE__);
1310                 }
1311                 stcb->asoc.overall_error_count = 0;
1312                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1313                 /*
1314                  * collapse the init timer back in case of a exponential
1315                  * backoff
1316                  */
1317                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1318                     stcb, net);
1319                 /*
1320                  * the send at the end of the inbound data processing will
1321                  * cause the cookie to be sent
1322                  */
1323                 break;
1324         case SCTP_STATE_SHUTDOWN_SENT:
1325                 /* incorrect state... discard */
1326                 break;
1327         case SCTP_STATE_COOKIE_ECHOED:
1328                 /* incorrect state... discard */
1329                 break;
1330         case SCTP_STATE_OPEN:
1331                 /* incorrect state... discard */
1332                 break;
1333         case SCTP_STATE_EMPTY:
1334         case SCTP_STATE_INUSE:
1335         default:
1336                 /* incorrect state... discard */
1337                 return (-1);
1338                 break;
1339         }
1340         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1341         return (0);
1342 }
1343
1344 static struct sctp_tcb *
1345 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1346     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1347     struct sctp_inpcb *inp, struct sctp_nets **netp,
1348     struct sockaddr *init_src, int *notification,
1349     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1350     uint32_t vrf_id, uint16_t port);
1351
1352
1353 /*
1354  * handle a state cookie for an existing association m: input packet mbuf
1355  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1356  * "split" mbuf and the cookie signature does not exist offset: offset into
1357  * mbuf to the cookie-echo chunk
1358  */
1359 static struct sctp_tcb *
1360 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1361     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1362     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1363     struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id,
1364     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1365 {
1366         struct sctp_association *asoc;
1367         struct sctp_init_chunk *init_cp, init_buf;
1368         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1369         struct sctp_nets *net;
1370         struct mbuf *op_err;
1371         struct sctp_paramhdr *ph;
1372         int chk_length;
1373         int init_offset, initack_offset, i;
1374         int retval;
1375         int spec_flag = 0;
1376         uint32_t how_indx;
1377
1378         net = *netp;
1379         /* I know that the TCB is non-NULL from the caller */
1380         asoc = &stcb->asoc;
1381         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1382                 if (asoc->cookie_how[how_indx] == 0)
1383                         break;
1384         }
1385         if (how_indx < sizeof(asoc->cookie_how)) {
1386                 asoc->cookie_how[how_indx] = 1;
1387         }
1388         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1389                 /* SHUTDOWN came in after sending INIT-ACK */
1390                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1391                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1392                     0, M_DONTWAIT, 1, MT_DATA);
1393                 if (op_err == NULL) {
1394                         /* FOOBAR */
1395                         return (NULL);
1396                 }
1397                 /* Set the len */
1398                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1399                 ph = mtod(op_err, struct sctp_paramhdr *);
1400                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1401                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1402                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1403                     vrf_id, net->port);
1404                 if (how_indx < sizeof(asoc->cookie_how))
1405                         asoc->cookie_how[how_indx] = 2;
1406                 return (NULL);
1407         }
1408         /*
1409          * find and validate the INIT chunk in the cookie (peer's info) the
1410          * INIT should start after the cookie-echo header struct (chunk
1411          * header, state cookie header struct)
1412          */
1413         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1414
1415         init_cp = (struct sctp_init_chunk *)
1416             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1417             (uint8_t *) & init_buf);
1418         if (init_cp == NULL) {
1419                 /* could not pull a INIT chunk in cookie */
1420                 return (NULL);
1421         }
1422         chk_length = ntohs(init_cp->ch.chunk_length);
1423         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1424                 return (NULL);
1425         }
1426         /*
1427          * find and validate the INIT-ACK chunk in the cookie (my info) the
1428          * INIT-ACK follows the INIT chunk
1429          */
1430         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1431         initack_cp = (struct sctp_init_ack_chunk *)
1432             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1433             (uint8_t *) & initack_buf);
1434         if (initack_cp == NULL) {
1435                 /* could not pull INIT-ACK chunk in cookie */
1436                 return (NULL);
1437         }
1438         chk_length = ntohs(initack_cp->ch.chunk_length);
1439         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1440                 return (NULL);
1441         }
1442         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1443             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1444                 /*
1445                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1446                  * to get into the OPEN state
1447                  */
1448                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1449                         /*-
1450                          * Opps, this means that we somehow generated two vtag's
1451                          * the same. I.e. we did:
1452                          *  Us               Peer
1453                          *   <---INIT(tag=a)------
1454                          *   ----INIT-ACK(tag=t)-->
1455                          *   ----INIT(tag=t)------> *1
1456                          *   <---INIT-ACK(tag=a)---
1457                          *   <----CE(tag=t)------------- *2
1458                          *
1459                          * At point *1 we should be generating a different
1460                          * tag t'. Which means we would throw away the CE and send
1461                          * ours instead. Basically this is case C (throw away side).
1462                          */
1463                         if (how_indx < sizeof(asoc->cookie_how))
1464                                 asoc->cookie_how[how_indx] = 17;
1465                         return (NULL);
1466
1467                 }
1468                 switch SCTP_GET_STATE
1469                         (asoc) {
1470                 case SCTP_STATE_COOKIE_WAIT:
1471                 case SCTP_STATE_COOKIE_ECHOED:
1472                         /*
1473                          * INIT was sent but got a COOKIE_ECHO with the
1474                          * correct tags... just accept it...but we must
1475                          * process the init so that we can make sure we have
1476                          * the right seq no's.
1477                          */
1478                         /* First we must process the INIT !! */
1479                         retval = sctp_process_init(init_cp, stcb, net);
1480                         if (retval < 0) {
1481                                 if (how_indx < sizeof(asoc->cookie_how))
1482                                         asoc->cookie_how[how_indx] = 3;
1483                                 return (NULL);
1484                         }
1485                         /* we have already processed the INIT so no problem */
1486                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1487                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1488                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1489                         /* update current state */
1490                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1491                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1492                         else
1493                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1494
1495                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1496                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1497                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1498                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1499                         }
1500                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1501                         sctp_stop_all_cookie_timers(stcb);
1502                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1503                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1504                             (inp->sctp_socket->so_qlimit == 0)
1505                             ) {
1506 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1507                                 struct socket *so;
1508
1509 #endif
1510                                 /*
1511                                  * Here is where collision would go if we
1512                                  * did a connect() and instead got a
1513                                  * init/init-ack/cookie done before the
1514                                  * init-ack came back..
1515                                  */
1516                                 stcb->sctp_ep->sctp_flags |=
1517                                     SCTP_PCB_FLAGS_CONNECTED;
1518 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1519                                 so = SCTP_INP_SO(stcb->sctp_ep);
1520                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1521                                 SCTP_TCB_UNLOCK(stcb);
1522                                 SCTP_SOCKET_LOCK(so, 1);
1523                                 SCTP_TCB_LOCK(stcb);
1524                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1525                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1526                                         SCTP_SOCKET_UNLOCK(so, 1);
1527                                         return (NULL);
1528                                 }
1529 #endif
1530                                 soisconnected(stcb->sctp_socket);
1531 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1532                                 SCTP_SOCKET_UNLOCK(so, 1);
1533 #endif
1534                         }
1535                         /* notify upper layer */
1536                         *notification = SCTP_NOTIFY_ASSOC_UP;
1537                         /*
1538                          * since we did not send a HB make sure we don't
1539                          * double things
1540                          */
1541                         net->hb_responded = 1;
1542                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1543                             &cookie->time_entered, sctp_align_unsafe_makecopy);
1544
1545                         if (stcb->asoc.sctp_autoclose_ticks &&
1546                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1547                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1548                                     inp, stcb, NULL);
1549                         }
1550                         break;
1551                 default:
1552                         /*
1553                          * we're in the OPEN state (or beyond), so peer must
1554                          * have simply lost the COOKIE-ACK
1555                          */
1556                         break;
1557                         }       /* end switch */
1558                 sctp_stop_all_cookie_timers(stcb);
1559                 /*
1560                  * We ignore the return code here.. not sure if we should
1561                  * somehow abort.. but we do have an existing asoc. This
1562                  * really should not fail.
1563                  */
1564                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1565                     init_offset + sizeof(struct sctp_init_chunk),
1566                     initack_offset, sh, init_src)) {
1567                         if (how_indx < sizeof(asoc->cookie_how))
1568                                 asoc->cookie_how[how_indx] = 4;
1569                         return (NULL);
1570                 }
1571                 /* respond with a COOKIE-ACK */
1572                 sctp_toss_old_cookies(stcb, asoc);
1573                 sctp_send_cookie_ack(stcb);
1574                 if (how_indx < sizeof(asoc->cookie_how))
1575                         asoc->cookie_how[how_indx] = 5;
1576                 return (stcb);
1577         }
1578         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1579             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1580             cookie->tie_tag_my_vtag == 0 &&
1581             cookie->tie_tag_peer_vtag == 0) {
1582                 /*
1583                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1584                  */
1585                 if (how_indx < sizeof(asoc->cookie_how))
1586                         asoc->cookie_how[how_indx] = 6;
1587                 return (NULL);
1588         }
1589         /*
1590          * If nat support, and the below and stcb is established, send back
1591          * a ABORT(colliding state) if we are established.
1592          */
1593         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1594             (asoc->peer_supports_nat) &&
1595             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1596             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1597             (asoc->peer_vtag == 0)))) {
1598                 /*
1599                  * Special case - Peer's support nat. We may have two init's
1600                  * that we gave out the same tag on since one was not
1601                  * established.. i.e. we get INIT from host-1 behind the nat
1602                  * and we respond tag-a, we get a INIT from host-2 behind
1603                  * the nat and we get tag-a again. Then we bring up host-1
1604                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1605                  * Now we have colliding state. We must send an abort here
1606                  * with colliding state indication.
1607                  */
1608                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1609                     0, M_DONTWAIT, 1, MT_DATA);
1610                 if (op_err == NULL) {
1611                         /* FOOBAR */
1612                         return (NULL);
1613                 }
1614                 /* pre-reserve some space */
1615 #ifdef INET6
1616                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1617 #else
1618                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1619 #endif
1620                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1621                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1622                 /* Set the len */
1623                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1624                 ph = mtod(op_err, struct sctp_paramhdr *);
1625                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1626                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1627                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1628                 return (NULL);
1629         }
1630         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1631             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1632             (asoc->peer_vtag == 0))) {
1633                 /*
1634                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1635                  * should be ok, re-accept peer info
1636                  */
1637                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1638                         /*
1639                          * Extension of case C. If we hit this, then the
1640                          * random number generator returned the same vtag
1641                          * when we first sent our INIT-ACK and when we later
1642                          * sent our INIT. The side with the seq numbers that
1643                          * are different will be the one that normnally
1644                          * would have hit case C. This in effect "extends"
1645                          * our vtags in this collision case to be 64 bits.
1646                          * The same collision could occur aka you get both
1647                          * vtag and seq number the same twice in a row.. but
1648                          * is much less likely. If it did happen then we
1649                          * would proceed through and bring up the assoc.. we
1650                          * may end up with the wrong stream setup however..
1651                          * which would be bad.. but there is no way to
1652                          * tell.. until we send on a stream that does not
1653                          * exist :-)
1654                          */
1655                         if (how_indx < sizeof(asoc->cookie_how))
1656                                 asoc->cookie_how[how_indx] = 7;
1657
1658                         return (NULL);
1659                 }
1660                 if (how_indx < sizeof(asoc->cookie_how))
1661                         asoc->cookie_how[how_indx] = 8;
1662                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1663                 sctp_stop_all_cookie_timers(stcb);
1664                 /*
1665                  * since we did not send a HB make sure we don't double
1666                  * things
1667                  */
1668                 net->hb_responded = 1;
1669                 if (stcb->asoc.sctp_autoclose_ticks &&
1670                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1671                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1672                             NULL);
1673                 }
1674                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1675                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1676
1677                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1678                         /*
1679                          * Ok the peer probably discarded our data (if we
1680                          * echoed a cookie+data). So anything on the
1681                          * sent_queue should be marked for retransmit, we
1682                          * may not get something to kick us so it COULD
1683                          * still take a timeout to move these.. but it can't
1684                          * hurt to mark them.
1685                          */
1686                         struct sctp_tmit_chunk *chk;
1687
1688                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1689                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1690                                         chk->sent = SCTP_DATAGRAM_RESEND;
1691                                         sctp_flight_size_decrease(chk);
1692                                         sctp_total_flight_decrease(stcb, chk);
1693                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1694                                         spec_flag++;
1695                                 }
1696                         }
1697
1698                 }
1699                 /* process the INIT info (peer's info) */
1700                 retval = sctp_process_init(init_cp, stcb, net);
1701                 if (retval < 0) {
1702                         if (how_indx < sizeof(asoc->cookie_how))
1703                                 asoc->cookie_how[how_indx] = 9;
1704                         return (NULL);
1705                 }
1706                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1707                     init_offset + sizeof(struct sctp_init_chunk),
1708                     initack_offset, sh, init_src)) {
1709                         if (how_indx < sizeof(asoc->cookie_how))
1710                                 asoc->cookie_how[how_indx] = 10;
1711                         return (NULL);
1712                 }
1713                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1714                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1715                         *notification = SCTP_NOTIFY_ASSOC_UP;
1716
1717                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1718                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1719                             (inp->sctp_socket->so_qlimit == 0)) {
1720 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1721                                 struct socket *so;
1722
1723 #endif
1724                                 stcb->sctp_ep->sctp_flags |=
1725                                     SCTP_PCB_FLAGS_CONNECTED;
1726 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1727                                 so = SCTP_INP_SO(stcb->sctp_ep);
1728                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1729                                 SCTP_TCB_UNLOCK(stcb);
1730                                 SCTP_SOCKET_LOCK(so, 1);
1731                                 SCTP_TCB_LOCK(stcb);
1732                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1733                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1734                                         SCTP_SOCKET_UNLOCK(so, 1);
1735                                         return (NULL);
1736                                 }
1737 #endif
1738                                 soisconnected(stcb->sctp_socket);
1739 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1740                                 SCTP_SOCKET_UNLOCK(so, 1);
1741 #endif
1742                         }
1743                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1744                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1745                         else
1746                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1747                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1748                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1749                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1750                 } else {
1751                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1752                 }
1753                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1754                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1755                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1756                             stcb->sctp_ep, stcb, asoc->primary_destination);
1757                 }
1758                 sctp_stop_all_cookie_timers(stcb);
1759                 sctp_toss_old_cookies(stcb, asoc);
1760                 sctp_send_cookie_ack(stcb);
1761                 if (spec_flag) {
1762                         /*
1763                          * only if we have retrans set do we do this. What
1764                          * this call does is get only the COOKIE-ACK out and
1765                          * then when we return the normal call to
1766                          * sctp_chunk_output will get the retrans out behind
1767                          * this.
1768                          */
1769                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1770                 }
1771                 if (how_indx < sizeof(asoc->cookie_how))
1772                         asoc->cookie_how[how_indx] = 11;
1773
1774                 return (stcb);
1775         }
1776         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1777             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1778             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1779             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1780             cookie->tie_tag_peer_vtag != 0) {
1781                 struct sctpasochead *head;
1782
1783                 if (asoc->peer_supports_nat) {
1784                         /*
1785                          * This is a gross gross hack. just call the
1786                          * cookie_new code since we are allowing a duplicate
1787                          * association. I hope this works...
1788                          */
1789                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1790                             inp, netp, init_src, notification,
1791                             auth_skipped, auth_offset, auth_len,
1792                             vrf_id, port));
1793                 }
1794                 /*
1795                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1796                  */
1797                 /* temp code */
1798                 if (how_indx < sizeof(asoc->cookie_how))
1799                         asoc->cookie_how[how_indx] = 12;
1800                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1801                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1802
1803                 *sac_assoc_id = sctp_get_associd(stcb);
1804                 /* notify upper layer */
1805                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1806                 atomic_add_int(&stcb->asoc.refcnt, 1);
1807                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1808                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1809                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1810                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1811                 }
1812                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1813                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1814                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1815                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1816                 }
1817                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1818                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1819                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1820                             stcb->sctp_ep, stcb, asoc->primary_destination);
1821
1822                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1823                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1824                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1825                 }
1826                 asoc->pre_open_streams =
1827                     ntohs(initack_cp->init.num_outbound_streams);
1828                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1829                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1830                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1831
1832                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1833
1834                 asoc->str_reset_seq_in = asoc->init_seq_number;
1835
1836                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1837                 if (asoc->mapping_array) {
1838                         memset(asoc->mapping_array, 0,
1839                             asoc->mapping_array_size);
1840                 }
1841                 if (asoc->nr_mapping_array) {
1842                         memset(asoc->nr_mapping_array, 0,
1843                             asoc->mapping_array_size);
1844                 }
1845                 SCTP_TCB_UNLOCK(stcb);
1846                 SCTP_INP_INFO_WLOCK();
1847                 SCTP_INP_WLOCK(stcb->sctp_ep);
1848                 SCTP_TCB_LOCK(stcb);
1849                 atomic_add_int(&stcb->asoc.refcnt, -1);
1850                 /* send up all the data */
1851                 SCTP_TCB_SEND_LOCK(stcb);
1852
1853                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1854                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1855                         stcb->asoc.strmout[i].stream_no = i;
1856                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1857                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1858                 }
1859                 /* process the INIT-ACK info (my info) */
1860                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1861                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1862
1863                 /* pull from vtag hash */
1864                 LIST_REMOVE(stcb, sctp_asocs);
1865                 /* re-insert to new vtag position */
1866                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1867                     SCTP_BASE_INFO(hashasocmark))];
1868                 /*
1869                  * put it in the bucket in the vtag hash of assoc's for the
1870                  * system
1871                  */
1872                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1873
1874                 /* process the INIT info (peer's info) */
1875                 SCTP_TCB_SEND_UNLOCK(stcb);
1876                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1877                 SCTP_INP_INFO_WUNLOCK();
1878
1879                 retval = sctp_process_init(init_cp, stcb, net);
1880                 if (retval < 0) {
1881                         if (how_indx < sizeof(asoc->cookie_how))
1882                                 asoc->cookie_how[how_indx] = 13;
1883
1884                         return (NULL);
1885                 }
1886                 /*
1887                  * since we did not send a HB make sure we don't double
1888                  * things
1889                  */
1890                 net->hb_responded = 1;
1891
1892                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1893                     init_offset + sizeof(struct sctp_init_chunk),
1894                     initack_offset, sh, init_src)) {
1895                         if (how_indx < sizeof(asoc->cookie_how))
1896                                 asoc->cookie_how[how_indx] = 14;
1897
1898                         return (NULL);
1899                 }
1900                 /* respond with a COOKIE-ACK */
1901                 sctp_stop_all_cookie_timers(stcb);
1902                 sctp_toss_old_cookies(stcb, asoc);
1903                 sctp_send_cookie_ack(stcb);
1904                 if (how_indx < sizeof(asoc->cookie_how))
1905                         asoc->cookie_how[how_indx] = 15;
1906
1907                 return (stcb);
1908         }
1909         if (how_indx < sizeof(asoc->cookie_how))
1910                 asoc->cookie_how[how_indx] = 16;
1911         /* all other cases... */
1912         return (NULL);
1913 }
1914
1915
1916 /*
1917  * handle a state cookie for a new association m: input packet mbuf chain--
1918  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1919  * and the cookie signature does not exist offset: offset into mbuf to the
1920  * cookie-echo chunk length: length of the cookie chunk to: where the init
1921  * was from returns a new TCB
1922  */
1923 struct sctp_tcb *
1924 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1925     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1926     struct sctp_inpcb *inp, struct sctp_nets **netp,
1927     struct sockaddr *init_src, int *notification,
1928     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1929     uint32_t vrf_id, uint16_t port)
1930 {
1931         struct sctp_tcb *stcb;
1932         struct sctp_init_chunk *init_cp, init_buf;
1933         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1934         struct sockaddr_storage sa_store;
1935         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1936         struct sockaddr_in *sin;
1937         struct sockaddr_in6 *sin6;
1938         struct sctp_association *asoc;
1939         int chk_length;
1940         int init_offset, initack_offset, initack_limit;
1941         int retval;
1942         int error = 0;
1943         uint32_t old_tag;
1944         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1945
1946 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1947         struct socket *so;
1948
1949         so = SCTP_INP_SO(inp);
1950 #endif
1951
1952         /*
1953          * find and validate the INIT chunk in the cookie (peer's info) the
1954          * INIT should start after the cookie-echo header struct (chunk
1955          * header, state cookie header struct)
1956          */
1957         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1958         init_cp = (struct sctp_init_chunk *)
1959             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1960             (uint8_t *) & init_buf);
1961         if (init_cp == NULL) {
1962                 /* could not pull a INIT chunk in cookie */
1963                 SCTPDBG(SCTP_DEBUG_INPUT1,
1964                     "process_cookie_new: could not pull INIT chunk hdr\n");
1965                 return (NULL);
1966         }
1967         chk_length = ntohs(init_cp->ch.chunk_length);
1968         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1969                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1970                 return (NULL);
1971         }
1972         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1973         /*
1974          * find and validate the INIT-ACK chunk in the cookie (my info) the
1975          * INIT-ACK follows the INIT chunk
1976          */
1977         initack_cp = (struct sctp_init_ack_chunk *)
1978             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1979             (uint8_t *) & initack_buf);
1980         if (initack_cp == NULL) {
1981                 /* could not pull INIT-ACK chunk in cookie */
1982                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
1983                 return (NULL);
1984         }
1985         chk_length = ntohs(initack_cp->ch.chunk_length);
1986         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1987                 return (NULL);
1988         }
1989         /*
1990          * NOTE: We can't use the INIT_ACK's chk_length to determine the
1991          * "initack_limit" value.  This is because the chk_length field
1992          * includes the length of the cookie, but the cookie is omitted when
1993          * the INIT and INIT_ACK are tacked onto the cookie...
1994          */
1995         initack_limit = offset + cookie_len;
1996
1997         /*
1998          * now that we know the INIT/INIT-ACK are in place, create a new TCB
1999          * and popluate
2000          */
2001
2002         /*
2003          * Here we do a trick, we set in NULL for the proc/thread argument.
2004          * We do this since in effect we only use the p argument when the
2005          * socket is unbound and we must do an implicit bind. Since we are
2006          * getting a cookie, we cannot be unbound.
2007          */
2008         stcb = sctp_aloc_assoc(inp, init_src, &error,
2009             ntohl(initack_cp->init.initiate_tag), vrf_id,
2010             (struct thread *)NULL
2011             );
2012         if (stcb == NULL) {
2013                 struct mbuf *op_err;
2014
2015                 /* memory problem? */
2016                 SCTPDBG(SCTP_DEBUG_INPUT1,
2017                     "process_cookie_new: no room for another TCB!\n");
2018                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2019
2020                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2021                     sh, op_err, vrf_id, port);
2022                 return (NULL);
2023         }
2024         /* get the correct sctp_nets */
2025         if (netp)
2026                 *netp = sctp_findnet(stcb, init_src);
2027
2028         asoc = &stcb->asoc;
2029         /* get scope variables out of cookie */
2030         asoc->ipv4_local_scope = cookie->ipv4_scope;
2031         asoc->site_scope = cookie->site_scope;
2032         asoc->local_scope = cookie->local_scope;
2033         asoc->loopback_scope = cookie->loopback_scope;
2034
2035         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2036             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2037                 struct mbuf *op_err;
2038
2039                 /*
2040                  * Houston we have a problem. The EP changed while the
2041                  * cookie was in flight. Only recourse is to abort the
2042                  * association.
2043                  */
2044                 atomic_add_int(&stcb->asoc.refcnt, 1);
2045                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2046                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2047                     sh, op_err, vrf_id, port);
2048 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2049                 SCTP_TCB_UNLOCK(stcb);
2050                 SCTP_SOCKET_LOCK(so, 1);
2051                 SCTP_TCB_LOCK(stcb);
2052 #endif
2053                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2054                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2055 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2056                 SCTP_SOCKET_UNLOCK(so, 1);
2057 #endif
2058                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2059                 return (NULL);
2060         }
2061         /* process the INIT-ACK info (my info) */
2062         old_tag = asoc->my_vtag;
2063         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2064         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2065         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2066         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2067         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2068         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2069         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2070         asoc->str_reset_seq_in = asoc->init_seq_number;
2071
2072         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2073
2074         /* process the INIT info (peer's info) */
2075         if (netp)
2076                 retval = sctp_process_init(init_cp, stcb, *netp);
2077         else
2078                 retval = 0;
2079         if (retval < 0) {
2080                 atomic_add_int(&stcb->asoc.refcnt, 1);
2081 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2082                 SCTP_TCB_UNLOCK(stcb);
2083                 SCTP_SOCKET_LOCK(so, 1);
2084                 SCTP_TCB_LOCK(stcb);
2085 #endif
2086                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2087 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2088                 SCTP_SOCKET_UNLOCK(so, 1);
2089 #endif
2090                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2091                 return (NULL);
2092         }
2093         /* load all addresses */
2094         if (sctp_load_addresses_from_init(stcb, m, iphlen,
2095             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2096             init_src)) {
2097                 atomic_add_int(&stcb->asoc.refcnt, 1);
2098 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2099                 SCTP_TCB_UNLOCK(stcb);
2100                 SCTP_SOCKET_LOCK(so, 1);
2101                 SCTP_TCB_LOCK(stcb);
2102 #endif
2103                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2104 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2105                 SCTP_SOCKET_UNLOCK(so, 1);
2106 #endif
2107                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2108                 return (NULL);
2109         }
2110         /*
2111          * verify any preceding AUTH chunk that was skipped
2112          */
2113         /* pull the local authentication parameters from the cookie/init-ack */
2114         sctp_auth_get_cookie_params(stcb, m,
2115             initack_offset + sizeof(struct sctp_init_ack_chunk),
2116             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2117         if (auth_skipped) {
2118                 struct sctp_auth_chunk *auth;
2119
2120                 auth = (struct sctp_auth_chunk *)
2121                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2122                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2123                         /* auth HMAC failed, dump the assoc and packet */
2124                         SCTPDBG(SCTP_DEBUG_AUTH1,
2125                             "COOKIE-ECHO: AUTH failed\n");
2126                         atomic_add_int(&stcb->asoc.refcnt, 1);
2127 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2128                         SCTP_TCB_UNLOCK(stcb);
2129                         SCTP_SOCKET_LOCK(so, 1);
2130                         SCTP_TCB_LOCK(stcb);
2131 #endif
2132                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2133 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2134                         SCTP_SOCKET_UNLOCK(so, 1);
2135 #endif
2136                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2137                         return (NULL);
2138                 } else {
2139                         /* remaining chunks checked... good to go */
2140                         stcb->asoc.authenticated = 1;
2141                 }
2142         }
2143         /* update current state */
2144         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2145         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2146         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2147                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2148                     stcb->sctp_ep, stcb, asoc->primary_destination);
2149         }
2150         sctp_stop_all_cookie_timers(stcb);
2151         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2152         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2153
2154         /*
2155          * if we're doing ASCONFs, check to see if we have any new local
2156          * addresses that need to get added to the peer (eg. addresses
2157          * changed while cookie echo in flight).  This needs to be done
2158          * after we go to the OPEN state to do the correct asconf
2159          * processing. else, make sure we have the correct addresses in our
2160          * lists
2161          */
2162
2163         /* warning, we re-use sin, sin6, sa_store here! */
2164         /* pull in local_address (our "from" address) */
2165         if (cookie->laddr_type == SCTP_IPV4_ADDRESS) {
2166                 /* source addr is IPv4 */
2167                 sin = (struct sockaddr_in *)initack_src;
2168                 memset(sin, 0, sizeof(*sin));
2169                 sin->sin_family = AF_INET;
2170                 sin->sin_len = sizeof(struct sockaddr_in);
2171                 sin->sin_addr.s_addr = cookie->laddress[0];
2172         } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) {
2173                 /* source addr is IPv6 */
2174                 sin6 = (struct sockaddr_in6 *)initack_src;
2175                 memset(sin6, 0, sizeof(*sin6));
2176                 sin6->sin6_family = AF_INET6;
2177                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2178                 sin6->sin6_scope_id = cookie->scope_id;
2179                 memcpy(&sin6->sin6_addr, cookie->laddress,
2180                     sizeof(sin6->sin6_addr));
2181         } else {
2182                 atomic_add_int(&stcb->asoc.refcnt, 1);
2183 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2184                 SCTP_TCB_UNLOCK(stcb);
2185                 SCTP_SOCKET_LOCK(so, 1);
2186                 SCTP_TCB_LOCK(stcb);
2187 #endif
2188                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2189 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2190                 SCTP_SOCKET_UNLOCK(so, 1);
2191 #endif
2192                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2193                 return (NULL);
2194         }
2195
2196         /* set up to notify upper layer */
2197         *notification = SCTP_NOTIFY_ASSOC_UP;
2198         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2199             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2200             (inp->sctp_socket->so_qlimit == 0)) {
2201                 /*
2202                  * This is an endpoint that called connect() how it got a
2203                  * cookie that is NEW is a bit of a mystery. It must be that
2204                  * the INIT was sent, but before it got there.. a complete
2205                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2206                  * should have went to the other code.. not here.. oh well..
2207                  * a bit of protection is worth having..
2208                  */
2209                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2210 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2211                 atomic_add_int(&stcb->asoc.refcnt, 1);
2212                 SCTP_TCB_UNLOCK(stcb);
2213                 SCTP_SOCKET_LOCK(so, 1);
2214                 SCTP_TCB_LOCK(stcb);
2215                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2216                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2217                         SCTP_SOCKET_UNLOCK(so, 1);
2218                         return (NULL);
2219                 }
2220 #endif
2221                 soisconnected(stcb->sctp_socket);
2222 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2223                 SCTP_SOCKET_UNLOCK(so, 1);
2224 #endif
2225         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2226             (inp->sctp_socket->so_qlimit)) {
2227                 /*
2228                  * We don't want to do anything with this one. Since it is
2229                  * the listening guy. The timer will get started for
2230                  * accepted connections in the caller.
2231                  */
2232                 ;
2233         }
2234         /* since we did not send a HB make sure we don't double things */
2235         if ((netp) && (*netp))
2236                 (*netp)->hb_responded = 1;
2237
2238         if (stcb->asoc.sctp_autoclose_ticks &&
2239             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2240                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2241         }
2242         /* calculate the RTT */
2243         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2244         if ((netp) && (*netp)) {
2245                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2246                     &cookie->time_entered, sctp_align_unsafe_makecopy);
2247         }
2248         /* respond with a COOKIE-ACK */
2249         sctp_send_cookie_ack(stcb);
2250
2251         /*
2252          * check the address lists for any ASCONFs that need to be sent
2253          * AFTER the cookie-ack is sent
2254          */
2255         sctp_check_address_list(stcb, m,
2256             initack_offset + sizeof(struct sctp_init_ack_chunk),
2257             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2258             initack_src, cookie->local_scope, cookie->site_scope,
2259             cookie->ipv4_scope, cookie->loopback_scope);
2260
2261
2262         return (stcb);
2263 }
2264
2265 /*
2266  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2267  * we NEED to make sure we are not already using the vtag. If so we
2268  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2269         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2270                                                             SCTP_BASE_INFO(hashasocmark))];
2271         LIST_FOREACH(stcb, head, sctp_asocs) {
2272                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2273                        -- SEND ABORT - TRY AGAIN --
2274                 }
2275         }
2276 */
2277
2278 /*
2279  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2280  * existing (non-NULL) TCB
2281  */
2282 static struct mbuf *
2283 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2284     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2285     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2286     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2287     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2288 {
2289         struct sctp_state_cookie *cookie;
2290         struct sockaddr_in6 sin6;
2291         struct sockaddr_in sin;
2292         struct sctp_tcb *l_stcb = *stcb;
2293         struct sctp_inpcb *l_inp;
2294         struct sockaddr *to;
2295         sctp_assoc_t sac_restart_id;
2296         struct sctp_pcb *ep;
2297         struct mbuf *m_sig;
2298         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2299         uint8_t *sig;
2300         uint8_t cookie_ok = 0;
2301         unsigned int size_of_pkt, sig_offset, cookie_offset;
2302         unsigned int cookie_len;
2303         struct timeval now;
2304         struct timeval time_expires;
2305         struct sockaddr_storage dest_store;
2306         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2307         struct ip *iph;
2308         int notification = 0;
2309         struct sctp_nets *netl;
2310         int had_a_existing_tcb = 0;
2311         int send_int_conf = 0;
2312
2313         SCTPDBG(SCTP_DEBUG_INPUT2,
2314             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2315
2316         if (inp_p == NULL) {
2317                 return (NULL);
2318         }
2319         /* First get the destination address setup too. */
2320         iph = mtod(m, struct ip *);
2321         switch (iph->ip_v) {
2322         case IPVERSION:
2323                 {
2324                         /* its IPv4 */
2325                         struct sockaddr_in *lsin;
2326
2327                         lsin = (struct sockaddr_in *)(localep_sa);
2328                         memset(lsin, 0, sizeof(*lsin));
2329                         lsin->sin_family = AF_INET;
2330                         lsin->sin_len = sizeof(*lsin);
2331                         lsin->sin_port = sh->dest_port;
2332                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2333                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2334                         break;
2335                 }
2336 #ifdef INET6
2337         case IPV6_VERSION >> 4:
2338                 {
2339                         /* its IPv6 */
2340                         struct ip6_hdr *ip6;
2341                         struct sockaddr_in6 *lsin6;
2342
2343                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2344                         memset(lsin6, 0, sizeof(*lsin6));
2345                         lsin6->sin6_family = AF_INET6;
2346                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2347                         ip6 = mtod(m, struct ip6_hdr *);
2348                         lsin6->sin6_port = sh->dest_port;
2349                         lsin6->sin6_addr = ip6->ip6_dst;
2350                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2351                         break;
2352                 }
2353 #endif
2354         default:
2355                 return (NULL);
2356         }
2357
2358         cookie = &cp->cookie;
2359         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2360         cookie_len = ntohs(cp->ch.chunk_length);
2361
2362         if ((cookie->peerport != sh->src_port) &&
2363             (cookie->myport != sh->dest_port) &&
2364             (cookie->my_vtag != sh->v_tag)) {
2365                 /*
2366                  * invalid ports or bad tag.  Note that we always leave the
2367                  * v_tag in the header in network order and when we stored
2368                  * it in the my_vtag slot we also left it in network order.
2369                  * This maintains the match even though it may be in the
2370                  * opposite byte order of the machine :->
2371                  */
2372                 return (NULL);
2373         }
2374         if (cookie_len > size_of_pkt ||
2375             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2376             sizeof(struct sctp_init_chunk) +
2377             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2378                 /* cookie too long!  or too small */
2379                 return (NULL);
2380         }
2381         /*
2382          * split off the signature into its own mbuf (since it should not be
2383          * calculated in the sctp_hmac_m() call).
2384          */
2385         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2386         if (sig_offset > size_of_pkt) {
2387                 /* packet not correct size! */
2388                 /* XXX this may already be accounted for earlier... */
2389                 return (NULL);
2390         }
2391         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2392         if (m_sig == NULL) {
2393                 /* out of memory or ?? */
2394                 return (NULL);
2395         }
2396 #ifdef SCTP_MBUF_LOGGING
2397         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2398                 struct mbuf *mat;
2399
2400                 mat = m_sig;
2401                 while (mat) {
2402                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2403                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2404                         }
2405                         mat = SCTP_BUF_NEXT(mat);
2406                 }
2407         }
2408 #endif
2409
2410         /*
2411          * compute the signature/digest for the cookie
2412          */
2413         ep = &(*inp_p)->sctp_ep;
2414         l_inp = *inp_p;
2415         if (l_stcb) {
2416                 SCTP_TCB_UNLOCK(l_stcb);
2417         }
2418         SCTP_INP_RLOCK(l_inp);
2419         if (l_stcb) {
2420                 SCTP_TCB_LOCK(l_stcb);
2421         }
2422         /* which cookie is it? */
2423         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2424             (ep->current_secret_number != ep->last_secret_number)) {
2425                 /* it's the old cookie */
2426                 (void)sctp_hmac_m(SCTP_HMAC,
2427                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2428                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2429         } else {
2430                 /* it's the current cookie */
2431                 (void)sctp_hmac_m(SCTP_HMAC,
2432                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2433                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2434         }
2435         /* get the signature */
2436         SCTP_INP_RUNLOCK(l_inp);
2437         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2438         if (sig == NULL) {
2439                 /* couldn't find signature */
2440                 sctp_m_freem(m_sig);
2441                 return (NULL);
2442         }
2443         /* compare the received digest with the computed digest */
2444         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2445                 /* try the old cookie? */
2446                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2447                     (ep->current_secret_number != ep->last_secret_number)) {
2448                         /* compute digest with old */
2449                         (void)sctp_hmac_m(SCTP_HMAC,
2450                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2451                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2452                         /* compare */
2453                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2454                                 cookie_ok = 1;
2455                 }
2456         } else {
2457                 cookie_ok = 1;
2458         }
2459
2460         /*
2461          * Now before we continue we must reconstruct our mbuf so that
2462          * normal processing of any other chunks will work.
2463          */
2464         {
2465                 struct mbuf *m_at;
2466
2467                 m_at = m;
2468                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2469                         m_at = SCTP_BUF_NEXT(m_at);
2470                 }
2471                 SCTP_BUF_NEXT(m_at) = m_sig;
2472         }
2473
2474         if (cookie_ok == 0) {
2475                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2476                 SCTPDBG(SCTP_DEBUG_INPUT2,
2477                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2478                     (uint32_t) offset, cookie_offset, sig_offset);
2479                 return (NULL);
2480         }
2481         /*
2482          * check the cookie timestamps to be sure it's not stale
2483          */
2484         (void)SCTP_GETTIME_TIMEVAL(&now);
2485         /* Expire time is in Ticks, so we convert to seconds */
2486         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2487         time_expires.tv_usec = cookie->time_entered.tv_usec;
2488         /*
2489          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2490          * is undefined.
2491          */
2492         if (timevalcmp(&now, &time_expires, >)) {
2493                 /* cookie is stale! */
2494                 struct mbuf *op_err;
2495                 struct sctp_stale_cookie_msg *scm;
2496                 uint32_t tim;
2497
2498                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2499                     0, M_DONTWAIT, 1, MT_DATA);
2500                 if (op_err == NULL) {
2501                         /* FOOBAR */
2502                         return (NULL);
2503                 }
2504                 /* Set the len */
2505                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2506                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2507                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2508                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2509                     (sizeof(uint32_t))));
2510                 /* seconds to usec */
2511                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2512                 /* add in usec */
2513                 if (tim == 0)
2514                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2515                 scm->time_usec = htonl(tim);
2516                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2517                     vrf_id, port);
2518                 return (NULL);
2519         }
2520         /*
2521          * Now we must see with the lookup address if we have an existing
2522          * asoc. This will only happen if we were in the COOKIE-WAIT state
2523          * and a INIT collided with us and somewhere the peer sent the
2524          * cookie on another address besides the single address our assoc
2525          * had for him. In this case we will have one of the tie-tags set at
2526          * least AND the address field in the cookie can be used to look it
2527          * up.
2528          */
2529         to = NULL;
2530         if (cookie->addr_type == SCTP_IPV6_ADDRESS) {
2531                 memset(&sin6, 0, sizeof(sin6));
2532                 sin6.sin6_family = AF_INET6;
2533                 sin6.sin6_len = sizeof(sin6);
2534                 sin6.sin6_port = sh->src_port;
2535                 sin6.sin6_scope_id = cookie->scope_id;
2536                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2537                     sizeof(sin6.sin6_addr.s6_addr));
2538                 to = (struct sockaddr *)&sin6;
2539         } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) {
2540                 memset(&sin, 0, sizeof(sin));
2541                 sin.sin_family = AF_INET;
2542                 sin.sin_len = sizeof(sin);
2543                 sin.sin_port = sh->src_port;
2544                 sin.sin_addr.s_addr = cookie->address[0];
2545                 to = (struct sockaddr *)&sin;
2546         } else {
2547                 /* This should not happen */
2548                 return (NULL);
2549         }
2550         if ((*stcb == NULL) && to) {
2551                 /* Yep, lets check */
2552                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2553                 if (*stcb == NULL) {
2554                         /*
2555                          * We should have only got back the same inp. If we
2556                          * got back a different ep we have a problem. The
2557                          * original findep got back l_inp and now
2558                          */
2559                         if (l_inp != *inp_p) {
2560                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2561                         }
2562                 } else {
2563                         if (*locked_tcb == NULL) {
2564                                 /*
2565                                  * In this case we found the assoc only
2566                                  * after we locked the create lock. This
2567                                  * means we are in a colliding case and we
2568                                  * must make sure that we unlock the tcb if
2569                                  * its one of the cases where we throw away
2570                                  * the incoming packets.
2571                                  */
2572                                 *locked_tcb = *stcb;
2573
2574                                 /*
2575                                  * We must also increment the inp ref count
2576                                  * since the ref_count flags was set when we
2577                                  * did not find the TCB, now we found it
2578                                  * which reduces the refcount.. we must
2579                                  * raise it back out to balance it all :-)
2580                                  */
2581                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2582                                 if ((*stcb)->sctp_ep != l_inp) {
2583                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2584                                             (*stcb)->sctp_ep, l_inp);
2585                                 }
2586                         }
2587                 }
2588         }
2589         if (to == NULL) {
2590                 return (NULL);
2591         }
2592         cookie_len -= SCTP_SIGNATURE_SIZE;
2593         if (*stcb == NULL) {
2594                 /* this is the "normal" case... get a new TCB */
2595                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2596                     cookie_len, *inp_p, netp, to, &notification,
2597                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2598         } else {
2599                 /* this is abnormal... cookie-echo on existing TCB */
2600                 had_a_existing_tcb = 1;
2601                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2602                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2603                     &notification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port);
2604         }
2605
2606         if (*stcb == NULL) {
2607                 /* still no TCB... must be bad cookie-echo */
2608                 return (NULL);
2609         }
2610         /*
2611          * Ok, we built an association so confirm the address we sent the
2612          * INIT-ACK to.
2613          */
2614         netl = sctp_findnet(*stcb, to);
2615         /*
2616          * This code should in theory NOT run but
2617          */
2618         if (netl == NULL) {
2619                 /* TSNH! Huh, why do I need to add this address here? */
2620                 int ret;
2621
2622                 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE,
2623                     SCTP_IN_COOKIE_PROC);
2624                 netl = sctp_findnet(*stcb, to);
2625         }
2626         if (netl) {
2627                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2628                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2629                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2630                             netl);
2631                         send_int_conf = 1;
2632                 }
2633         }
2634         if (*stcb) {
2635                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p,
2636                     *stcb, NULL);
2637         }
2638         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2639                 if (!had_a_existing_tcb ||
2640                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2641                         /*
2642                          * If we have a NEW cookie or the connect never
2643                          * reached the connected state during collision we
2644                          * must do the TCP accept thing.
2645                          */
2646                         struct socket *so, *oso;
2647                         struct sctp_inpcb *inp;
2648
2649                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2650                                 /*
2651                                  * For a restart we will keep the same
2652                                  * socket, no need to do anything. I THINK!!
2653                                  */
2654                                 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED);
2655                                 if (send_int_conf) {
2656                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2657                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2658                                 }
2659                                 return (m);
2660                         }
2661                         oso = (*inp_p)->sctp_socket;
2662                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2663                         SCTP_TCB_UNLOCK((*stcb));
2664                         so = sonewconn(oso, 0
2665                             );
2666                         SCTP_TCB_LOCK((*stcb));
2667                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2668
2669                         if (so == NULL) {
2670                                 struct mbuf *op_err;
2671
2672 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2673                                 struct socket *pcb_so;
2674
2675 #endif
2676                                 /* Too many sockets */
2677                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2678                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2679                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2680                                     sh, op_err, vrf_id, port);
2681 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2682                                 pcb_so = SCTP_INP_SO(*inp_p);
2683                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2684                                 SCTP_TCB_UNLOCK((*stcb));
2685                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2686                                 SCTP_TCB_LOCK((*stcb));
2687                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2688 #endif
2689                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2690 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2691                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2692 #endif
2693                                 return (NULL);
2694                         }
2695                         inp = (struct sctp_inpcb *)so->so_pcb;
2696                         SCTP_INP_INCR_REF(inp);
2697                         /*
2698                          * We add the unbound flag here so that if we get an
2699                          * soabort() before we get the move_pcb done, we
2700                          * will properly cleanup.
2701                          */
2702                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2703                             SCTP_PCB_FLAGS_CONNECTED |
2704                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2705                             SCTP_PCB_FLAGS_UNBOUND |
2706                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2707                             SCTP_PCB_FLAGS_DONT_WAKE);
2708                         inp->sctp_features = (*inp_p)->sctp_features;
2709                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2710                         inp->sctp_socket = so;
2711                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2712                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2713                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2714                         inp->sctp_context = (*inp_p)->sctp_context;
2715                         inp->inp_starting_point_for_iterator = NULL;
2716                         /*
2717                          * copy in the authentication parameters from the
2718                          * original endpoint
2719                          */
2720                         if (inp->sctp_ep.local_hmacs)
2721                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2722                         inp->sctp_ep.local_hmacs =
2723                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2724                         if (inp->sctp_ep.local_auth_chunks)
2725                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2726                         inp->sctp_ep.local_auth_chunks =
2727                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2728
2729                         /*
2730                          * Now we must move it from one hash table to
2731                          * another and get the tcb in the right place.
2732                          */
2733
2734                         /*
2735                          * This is where the one-2-one socket is put into
2736                          * the accept state waiting for the accept!
2737                          */
2738                         if (*stcb) {
2739                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2740                         }
2741                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2742
2743                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2744                         SCTP_TCB_UNLOCK((*stcb));
2745
2746                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2747                             0);
2748                         SCTP_TCB_LOCK((*stcb));
2749                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2750
2751
2752                         /*
2753                          * now we must check to see if we were aborted while
2754                          * the move was going on and the lock/unlock
2755                          * happened.
2756                          */
2757                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2758                                 /*
2759                                  * yep it was, we leave the assoc attached
2760                                  * to the socket since the sctp_inpcb_free()
2761                                  * call will send an abort for us.
2762                                  */
2763                                 SCTP_INP_DECR_REF(inp);
2764                                 return (NULL);
2765                         }
2766                         SCTP_INP_DECR_REF(inp);
2767                         /* Switch over to the new guy */
2768                         *inp_p = inp;
2769                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2770                         if (send_int_conf) {
2771                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2772                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2773                         }
2774                         /*
2775                          * Pull it from the incomplete queue and wake the
2776                          * guy
2777                          */
2778 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2779                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2780                         SCTP_TCB_UNLOCK((*stcb));
2781                         SCTP_SOCKET_LOCK(so, 1);
2782 #endif
2783                         soisconnected(so);
2784 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2785                         SCTP_TCB_LOCK((*stcb));
2786                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2787                         SCTP_SOCKET_UNLOCK(so, 1);
2788 #endif
2789                         return (m);
2790                 }
2791         }
2792         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2793                 if (notification) {
2794                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2795                 }
2796                 if (send_int_conf) {
2797                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2798                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2799                 }
2800         }
2801         return (m);
2802 }
2803
2804 static void
2805 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
2806     struct sctp_tcb *stcb, struct sctp_nets *net)
2807 {
2808         /* cp must not be used, others call this without a c-ack :-) */
2809         struct sctp_association *asoc;
2810
2811         SCTPDBG(SCTP_DEBUG_INPUT2,
2812             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2813         if (stcb == NULL)
2814                 return;
2815
2816         asoc = &stcb->asoc;
2817
2818         sctp_stop_all_cookie_timers(stcb);
2819         /* process according to association state */
2820         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2821                 /* state change only needed when I am in right state */
2822                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2823                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2824                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2825                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2826                             stcb->sctp_ep, stcb, asoc->primary_destination);
2827
2828                 }
2829                 /* update RTO */
2830                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2831                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2832                 if (asoc->overall_error_count == 0) {
2833                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2834                             &asoc->time_entered, sctp_align_safe_nocopy);
2835                 }
2836                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2837                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2838                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2839                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2840 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2841                         struct socket *so;
2842
2843 #endif
2844                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2845 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2846                         so = SCTP_INP_SO(stcb->sctp_ep);
2847                         atomic_add_int(&stcb->asoc.refcnt, 1);
2848                         SCTP_TCB_UNLOCK(stcb);
2849                         SCTP_SOCKET_LOCK(so, 1);
2850                         SCTP_TCB_LOCK(stcb);
2851                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2852                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2853                                 SCTP_SOCKET_UNLOCK(so, 1);
2854                                 return;
2855                         }
2856 #endif
2857                         soisconnected(stcb->sctp_socket);
2858 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2859                         SCTP_SOCKET_UNLOCK(so, 1);
2860 #endif
2861                 }
2862                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2863                     stcb, net);
2864                 /*
2865                  * since we did not send a HB make sure we don't double
2866                  * things
2867                  */
2868                 net->hb_responded = 1;
2869
2870                 if (stcb->asoc.sctp_autoclose_ticks &&
2871                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2872                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2873                             stcb->sctp_ep, stcb, NULL);
2874                 }
2875                 /*
2876                  * send ASCONF if parameters are pending and ASCONFs are
2877                  * allowed (eg. addresses changed when init/cookie echo were
2878                  * in flight)
2879                  */
2880                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2881                     (stcb->asoc.peer_supports_asconf) &&
2882                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2883 #ifdef SCTP_TIMER_BASED_ASCONF
2884                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2885                             stcb->sctp_ep, stcb,
2886                             stcb->asoc.primary_destination);
2887 #else
2888                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2889                             SCTP_ADDR_NOT_LOCKED);
2890 #endif
2891                 }
2892         }
2893         /* Toss the cookie if I can */
2894         sctp_toss_old_cookies(stcb, asoc);
2895         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2896                 /* Restart the timer if we have pending data */
2897                 struct sctp_tmit_chunk *chk;
2898
2899                 chk = TAILQ_FIRST(&asoc->sent_queue);
2900                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2901         }
2902 }
2903
2904 static void
2905 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2906     struct sctp_tcb *stcb)
2907 {
2908         struct sctp_nets *net;
2909         struct sctp_tmit_chunk *lchk;
2910         struct sctp_ecne_chunk bkup;
2911         uint8_t override_bit = 0;
2912         uint32_t tsn, window_data_tsn;
2913         int len;
2914         int pkt_cnt;
2915
2916         len = ntohs(cp->ch.chunk_length);
2917         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2918             (len != sizeof(struct old_sctp_ecne_chunk))) {
2919                 return;
2920         }
2921         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2922                 /* Its the old format */
2923                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2924                 bkup.num_pkts_since_cwr = htonl(1);
2925                 cp = &bkup;
2926         }
2927         SCTP_STAT_INCR(sctps_recvecne);
2928         tsn = ntohl(cp->tsn);
2929         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2930         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2931         if (lchk == NULL) {
2932                 window_data_tsn = stcb->asoc.sending_seq - 1;
2933         } else {
2934                 window_data_tsn = lchk->rec.data.TSN_seq;
2935         }
2936
2937         /* Find where it was sent to if possible. */
2938         net = NULL;
2939         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2940                 if (lchk->rec.data.TSN_seq == tsn) {
2941                         net = lchk->whoTo;
2942                         break;
2943                 }
2944                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
2945                         break;
2946                 }
2947         }
2948         if (net == NULL) {
2949                 /*
2950                  * What to do. A previous send of a CWR was possibly lost.
2951                  * See how old it is, we may have it marked on the actual
2952                  * net.
2953                  */
2954                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2955                         if (tsn == net->last_cwr_tsn) {
2956                                 /* Found him, send it off */
2957                                 goto out;
2958                         }
2959                 }
2960                 /*
2961                  * If we reach here, we need to send a special CWR that says
2962                  * hey, we did this a long time ago and you lost the
2963                  * response.
2964                  */
2965                 net = TAILQ_FIRST(&stcb->asoc.nets);
2966                 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2967         }
2968 out:
2969         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2970             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2971                 /*
2972                  * JRS - Use the congestion control given in the pluggable
2973                  * CC module
2974                  */
2975                 int ocwnd;
2976
2977                 ocwnd = net->cwnd;
2978                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2979                 /*
2980                  * We reduce once every RTT. So we will only lower cwnd at
2981                  * the next sending seq i.e. the window_data_tsn
2982                  */
2983                 net->cwr_window_tsn = window_data_tsn;
2984                 net->ecn_ce_pkt_cnt += pkt_cnt;
2985                 net->lost_cnt = pkt_cnt;
2986                 net->last_cwr_tsn = tsn;
2987         } else {
2988                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2989                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2990                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2991                         /*
2992                          * Another loss in the same window update how many
2993                          * marks/packets lost we have had.
2994                          */
2995                         int cnt = 1;
2996
2997                         if (pkt_cnt > net->lost_cnt) {
2998                                 /* Should be the case */
2999                                 cnt = (pkt_cnt - net->lost_cnt);
3000                                 net->ecn_ce_pkt_cnt += cnt;
3001                         }
3002                         net->lost_cnt = pkt_cnt;
3003                         net->last_cwr_tsn = tsn;
3004                         /*
3005                          * Most CC functions will ignore this call, since we
3006                          * are in-window yet of the initial CE the peer saw.
3007                          */
3008                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3009                 }
3010         }
3011         /*
3012          * We always send a CWR this way if our previous one was lost our
3013          * peer will get an update, or if it is not time again to reduce we
3014          * still get the cwr to the peer. Note we set the override when we
3015          * could not find the TSN on the chunk or the destination network.
3016          */
3017         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3018 }
3019
3020 static void
3021 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3022 {
3023         /*
3024          * Here we get a CWR from the peer. We must look in the outqueue and
3025          * make sure that we have a covered ECNE in teh control chunk part.
3026          * If so remove it.
3027          */
3028         struct sctp_tmit_chunk *chk;
3029         struct sctp_ecne_chunk *ecne;
3030         int override;
3031         uint32_t cwr_tsn;
3032
3033         cwr_tsn = ntohl(cp->tsn);
3034
3035         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3036         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3037                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3038                         continue;
3039                 }
3040                 if ((override == 0) && (chk->whoTo != net)) {
3041                         /* Must be from the right src unless override is set */
3042                         continue;
3043                 }
3044                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3045                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3046                         /* this covers this ECNE, we can remove it */
3047                         stcb->asoc.ecn_echo_cnt_onq--;
3048                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3049                             sctp_next);
3050                         if (chk->data) {
3051                                 sctp_m_freem(chk->data);
3052                                 chk->data = NULL;
3053                         }
3054                         stcb->asoc.ctrl_queue_cnt--;
3055                         sctp_free_a_chunk(stcb, chk);
3056                         if (override == 0) {
3057                                 break;
3058                         }
3059                 }
3060         }
3061 }
3062
3063 static void
3064 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
3065     struct sctp_tcb *stcb, struct sctp_nets *net)
3066 {
3067         struct sctp_association *asoc;
3068
3069 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3070         struct socket *so;
3071
3072 #endif
3073
3074         SCTPDBG(SCTP_DEBUG_INPUT2,
3075             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3076         if (stcb == NULL)
3077                 return;
3078
3079         asoc = &stcb->asoc;
3080         /* process according to association state */
3081         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3082                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3083                 SCTPDBG(SCTP_DEBUG_INPUT2,
3084                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3085                 SCTP_TCB_UNLOCK(stcb);
3086                 return;
3087         }
3088         /* notify upper layer protocol */
3089         if (stcb->sctp_socket) {
3090                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3091                 /* are the queues empty? they should be */
3092                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3093                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3094                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3095                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3096                 }
3097         }
3098         /* stop the timer */
3099         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3100         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3101         /* free the TCB */
3102         SCTPDBG(SCTP_DEBUG_INPUT2,
3103             "sctp_handle_shutdown_complete: calls free-asoc\n");
3104 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3105         so = SCTP_INP_SO(stcb->sctp_ep);
3106         atomic_add_int(&stcb->asoc.refcnt, 1);
3107         SCTP_TCB_UNLOCK(stcb);
3108         SCTP_SOCKET_LOCK(so, 1);
3109         SCTP_TCB_LOCK(stcb);
3110         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3111 #endif
3112         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3113 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3114         SCTP_SOCKET_UNLOCK(so, 1);
3115 #endif
3116         return;
3117 }
3118
3119 static int
3120 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3121     struct sctp_nets *net, uint8_t flg)
3122 {
3123         switch (desc->chunk_type) {
3124         case SCTP_DATA:
3125                 /* find the tsn to resend (possibly */
3126                 {
3127                         uint32_t tsn;
3128                         struct sctp_tmit_chunk *tp1;
3129
3130                         tsn = ntohl(desc->tsn_ifany);
3131                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3132                                 if (tp1->rec.data.TSN_seq == tsn) {
3133                                         /* found it */
3134                                         break;
3135                                 }
3136                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3137                                         /* not found */
3138                                         tp1 = NULL;
3139                                         break;
3140                                 }
3141                         }
3142                         if (tp1 == NULL) {
3143                                 /*
3144                                  * Do it the other way , aka without paying
3145                                  * attention to queue seq order.
3146                                  */
3147                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3148                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3149                                         if (tp1->rec.data.TSN_seq == tsn) {
3150                                                 /* found it */
3151                                                 break;
3152                                         }
3153                                 }
3154                         }
3155                         if (tp1 == NULL) {
3156                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3157                         }
3158                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3159                                 uint8_t *ddp;
3160
3161                                 if (((flg & SCTP_BADCRC) == 0) &&
3162                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3163                                         return (0);
3164                                 }
3165                                 if ((stcb->asoc.peers_rwnd == 0) &&
3166                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3167                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3168                                         return (0);
3169                                 }
3170                                 if (stcb->asoc.peers_rwnd == 0 &&
3171                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3172                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3173                                         return (0);
3174                                 }
3175                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3176                                     sizeof(struct sctp_data_chunk));
3177                                 {
3178                                         unsigned int iii;
3179
3180                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3181                                             iii++) {
3182                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3183                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3184                                                         return (-1);
3185                                                 }
3186                                         }
3187                                 }
3188
3189                                 if (tp1->do_rtt) {
3190                                         /*
3191                                          * this guy had a RTO calculation
3192                                          * pending on it, cancel it
3193                                          */
3194                                         tp1->do_rtt = 0;
3195                                 }
3196                                 SCTP_STAT_INCR(sctps_pdrpmark);
3197                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3198                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3199                                 /*
3200                                  * mark it as if we were doing a FR, since
3201                                  * we will be getting gap ack reports behind
3202                                  * the info from the router.
3203                                  */
3204                                 tp1->rec.data.doing_fast_retransmit = 1;
3205                                 /*
3206                                  * mark the tsn with what sequences can
3207                                  * cause a new FR.
3208                                  */
3209                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3210                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3211                                 } else {
3212                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3213                                 }
3214
3215                                 /* restart the timer */
3216                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3217                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3218                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3219                                     stcb, tp1->whoTo);
3220
3221                                 /* fix counts and things */
3222                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3223                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3224                                             tp1->whoTo->flight_size,
3225                                             tp1->book_size,
3226                                             (uintptr_t) stcb,
3227                                             tp1->rec.data.TSN_seq);
3228                                 }
3229                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3230                                         sctp_flight_size_decrease(tp1);
3231                                         sctp_total_flight_decrease(stcb, tp1);
3232                                 }
3233                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3234                         } {
3235                                 /* audit code */
3236                                 unsigned int audit;
3237
3238                                 audit = 0;
3239                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3240                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3241                                                 audit++;
3242                                 }
3243                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3244                                     sctp_next) {
3245                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3246                                                 audit++;
3247                                 }
3248                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3249                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3250                                             audit, stcb->asoc.sent_queue_retran_cnt);
3251 #ifndef SCTP_AUDITING_ENABLED
3252                                         stcb->asoc.sent_queue_retran_cnt = audit;
3253 #endif
3254                                 }
3255                         }
3256                 }
3257                 break;
3258         case SCTP_ASCONF:
3259                 {
3260                         struct sctp_tmit_chunk *asconf;
3261
3262                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3263                             sctp_next) {
3264                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3265                                         break;
3266                                 }
3267                         }
3268                         if (asconf) {
3269                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3270                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3271                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3272                                 asconf->snd_count--;
3273                         }
3274                 }
3275                 break;
3276         case SCTP_INITIATION:
3277                 /* resend the INIT */
3278                 stcb->asoc.dropped_special_cnt++;
3279                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3280                         /*
3281                          * If we can get it in, in a few attempts we do
3282                          * this, otherwise we let the timer fire.
3283                          */
3284                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3285                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3286                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3287                 }
3288                 break;
3289         case SCTP_SELECTIVE_ACK:
3290         case SCTP_NR_SELECTIVE_ACK:
3291                 /* resend the sack */
3292                 sctp_send_sack(stcb);
3293                 break;
3294         case SCTP_HEARTBEAT_REQUEST:
3295                 /* resend a demand HB */
3296                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3297                         /*
3298                          * Only retransmit if we KNOW we wont destroy the
3299                          * tcb
3300                          */
3301                         (void)sctp_send_hb(stcb, 1, net);
3302                 }
3303                 break;
3304         case SCTP_SHUTDOWN:
3305                 sctp_send_shutdown(stcb, net);
3306                 break;
3307         case SCTP_SHUTDOWN_ACK:
3308                 sctp_send_shutdown_ack(stcb, net);
3309                 break;
3310         case SCTP_COOKIE_ECHO:
3311                 {
3312                         struct sctp_tmit_chunk *cookie;
3313
3314                         cookie = NULL;
3315                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3316                             sctp_next) {
3317                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3318                                         break;
3319                                 }
3320                         }
3321                         if (cookie) {
3322                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3323                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3324                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3325                                 sctp_stop_all_cookie_timers(stcb);
3326                         }
3327                 }
3328                 break;
3329         case SCTP_COOKIE_ACK:
3330                 sctp_send_cookie_ack(stcb);
3331                 break;
3332         case SCTP_ASCONF_ACK:
3333                 /* resend last asconf ack */
3334                 sctp_send_asconf_ack(stcb);
3335                 break;
3336         case SCTP_FORWARD_CUM_TSN:
3337                 send_forward_tsn(stcb, &stcb->asoc);
3338                 break;
3339                 /* can't do anything with these */
3340         case SCTP_PACKET_DROPPED:
3341         case SCTP_INITIATION_ACK:       /* this should not happen */
3342         case SCTP_HEARTBEAT_ACK:
3343         case SCTP_ABORT_ASSOCIATION:
3344         case SCTP_OPERATION_ERROR:
3345         case SCTP_SHUTDOWN_COMPLETE:
3346         case SCTP_ECN_ECHO:
3347         case SCTP_ECN_CWR:
3348         default:
3349                 break;
3350         }
3351         return (0);
3352 }
3353
3354 void
3355 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3356 {
3357         int i;
3358         uint16_t temp;
3359
3360         /*
3361          * We set things to 0xffff since this is the last delivered sequence
3362          * and we will be sending in 0 after the reset.
3363          */
3364
3365         if (number_entries) {
3366                 for (i = 0; i < number_entries; i++) {
3367                         temp = ntohs(list[i]);
3368                         if (temp >= stcb->asoc.streamincnt) {
3369                                 continue;
3370                         }
3371                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3372                 }
3373         } else {
3374                 list = NULL;
3375                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3376                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3377                 }
3378         }
3379         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3380 }
3381
3382 static void
3383 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3384 {
3385         int i;
3386
3387         if (number_entries == 0) {
3388                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3389                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3390                 }
3391         } else if (number_entries) {
3392                 for (i = 0; i < number_entries; i++) {
3393                         uint16_t temp;
3394
3395                         temp = ntohs(list[i]);
3396                         if (temp >= stcb->asoc.streamoutcnt) {
3397                                 /* no such stream */
3398                                 continue;
3399                         }
3400                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3401                 }
3402         }
3403         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3404 }
3405
3406
3407 struct sctp_stream_reset_out_request *
3408 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3409 {
3410         struct sctp_association *asoc;
3411         struct sctp_stream_reset_out_req *req;
3412         struct sctp_stream_reset_out_request *r;
3413         struct sctp_tmit_chunk *chk;
3414         int len, clen;
3415
3416         asoc = &stcb->asoc;
3417         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3418                 asoc->stream_reset_outstanding = 0;
3419                 return (NULL);
3420         }
3421         if (stcb->asoc.str_reset == NULL) {
3422                 asoc->stream_reset_outstanding = 0;
3423                 return (NULL);
3424         }
3425         chk = stcb->asoc.str_reset;
3426         if (chk->data == NULL) {
3427                 return (NULL);
3428         }
3429         if (bchk) {
3430                 /* he wants a copy of the chk pointer */
3431                 *bchk = chk;
3432         }
3433         clen = chk->send_size;
3434         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3435         r = &req->sr_req;
3436         if (ntohl(r->request_seq) == seq) {
3437                 /* found it */
3438                 return (r);
3439         }
3440         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3441         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3442                 /* move to the next one, there can only be a max of two */
3443                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3444                 if (ntohl(r->request_seq) == seq) {
3445                         return (r);
3446                 }
3447         }
3448         /* that seq is not here */
3449         return (NULL);
3450 }
3451
3452 static void
3453 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3454 {
3455         struct sctp_association *asoc;
3456         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3457
3458         if (stcb->asoc.str_reset == NULL) {
3459                 return;
3460         }
3461         asoc = &stcb->asoc;
3462
3463         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3464         TAILQ_REMOVE(&asoc->control_send_queue,
3465             chk,
3466             sctp_next);
3467         if (chk->data) {
3468                 sctp_m_freem(chk->data);
3469                 chk->data = NULL;
3470         }
3471         asoc->ctrl_queue_cnt--;
3472         sctp_free_a_chunk(stcb, chk);
3473         /* sa_ignore NO_NULL_CHK */
3474         stcb->asoc.str_reset = NULL;
3475 }
3476
3477
3478 static int
3479 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3480     uint32_t seq, uint32_t action,
3481     struct sctp_stream_reset_response *respin)
3482 {
3483         uint16_t type;
3484         int lparm_len;
3485         struct sctp_association *asoc = &stcb->asoc;
3486         struct sctp_tmit_chunk *chk;
3487         struct sctp_stream_reset_out_request *srparam;
3488         int number_entries;
3489
3490         if (asoc->stream_reset_outstanding == 0) {
3491                 /* duplicate */
3492                 return (0);
3493         }
3494         if (seq == stcb->asoc.str_reset_seq_out) {
3495                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3496                 if (srparam) {
3497                         stcb->asoc.str_reset_seq_out++;
3498                         type = ntohs(srparam->ph.param_type);
3499                         lparm_len = ntohs(srparam->ph.param_length);
3500                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3501                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3502                                 asoc->stream_reset_out_is_outstanding = 0;
3503                                 if (asoc->stream_reset_outstanding)
3504                                         asoc->stream_reset_outstanding--;
3505                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3506                                         /* do it */
3507                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3508                                 } else {
3509                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3510                                 }
3511                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3512                                 /* Answered my request */
3513                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3514                                 if (asoc->stream_reset_outstanding)
3515                                         asoc->stream_reset_outstanding--;
3516                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
3517                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3518                                 }
3519                         } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3520                                 /* Ok we now may have more streams */
3521                                 if (asoc->stream_reset_outstanding)
3522                                         asoc->stream_reset_outstanding--;
3523                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3524                                         /* Put the new streams into effect */
3525                                         stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3526                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3527                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3528                                 } else {
3529                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3530                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3531                                 }
3532                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3533                                 /**
3534                                  * a) Adopt the new in tsn.
3535                                  * b) reset the map
3536                                  * c) Adopt the new out-tsn
3537                                  */
3538                                 struct sctp_stream_reset_response_tsn *resp;
3539                                 struct sctp_forward_tsn_chunk fwdtsn;
3540                                 int abort_flag = 0;
3541
3542                                 if (respin == NULL) {
3543                                         /* huh ? */
3544                                         return (0);
3545                                 }
3546                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3547                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3548                                         asoc->stream_reset_outstanding--;
3549                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3550                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3551                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3552                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3553                                         if (abort_flag) {
3554                                                 return (1);
3555                                         }
3556                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3557                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3558                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3559                                         }
3560                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3561                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3562                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3563
3564                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3565                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3566
3567                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3568                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3569
3570                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3571                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3572
3573                                 }
3574                         }
3575                         /* get rid of the request and get the request flags */
3576                         if (asoc->stream_reset_outstanding == 0) {
3577                                 sctp_clean_up_stream_reset(stcb);
3578                         }
3579                 }
3580         }
3581         return (0);
3582 }
3583
3584 static void
3585 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3586     struct sctp_tmit_chunk *chk,
3587     struct sctp_stream_reset_in_request *req, int trunc)
3588 {
3589         uint32_t seq;
3590         int len, i;
3591         int number_entries;
3592         uint16_t temp;
3593
3594         /*
3595          * peer wants me to send a str-reset to him for my outgoing seq's if
3596          * seq_in is right.
3597          */
3598         struct sctp_association *asoc = &stcb->asoc;
3599
3600         seq = ntohl(req->request_seq);
3601         if (asoc->str_reset_seq_in == seq) {
3602                 if (trunc) {
3603                         /* Can't do it, since they exceeded our buffer size  */
3604                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3605                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3606                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3607                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3608                         len = ntohs(req->ph.param_length);
3609                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3610                         for (i = 0; i < number_entries; i++) {
3611                                 temp = ntohs(req->list_of_streams[i]);
3612                                 req->list_of_streams[i] = temp;
3613                         }
3614                         /* move the reset action back one */
3615                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3616                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3617                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3618                             asoc->str_reset_seq_out,
3619                             seq, (asoc->sending_seq - 1));
3620                         asoc->stream_reset_out_is_outstanding = 1;
3621                         asoc->str_reset = chk;
3622                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3623                         stcb->asoc.stream_reset_outstanding++;
3624                 } else {
3625                         /* Can't do it, since we have sent one out */
3626                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3627                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3628                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3629                 }
3630                 asoc->str_reset_seq_in++;
3631         } else if (asoc->str_reset_seq_in - 1 == seq) {
3632                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3633         } else if (asoc->str_reset_seq_in - 2 == seq) {
3634                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3635         } else {
3636                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3637         }
3638 }
3639
3640 static int
3641 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3642     struct sctp_tmit_chunk *chk,
3643     struct sctp_stream_reset_tsn_request *req)
3644 {
3645         /* reset all in and out and update the tsn */
3646         /*
3647          * A) reset my str-seq's on in and out. B) Select a receive next,
3648          * and set cum-ack to it. Also process this selected number as a
3649          * fwd-tsn as well. C) set in the response my next sending seq.
3650          */
3651         struct sctp_forward_tsn_chunk fwdtsn;
3652         struct sctp_association *asoc = &stcb->asoc;
3653         int abort_flag = 0;
3654         uint32_t seq;
3655
3656         seq = ntohl(req->request_seq);
3657         if (asoc->str_reset_seq_in == seq) {
3658                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3659                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3660                 fwdtsn.ch.chunk_flags = 0;
3661                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3662                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3663                 if (abort_flag) {
3664                         return (1);
3665                 }
3666                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3667                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3668                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3669                 }
3670                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3671                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3672                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3673                 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3674                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3675                 atomic_add_int(&stcb->asoc.sending_seq, 1);
3676                 /* save off historical data for retrans */
3677                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3678                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3679                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3680                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3681
3682                 sctp_add_stream_reset_result_tsn(chk,
3683                     ntohl(req->request_seq),
3684                     SCTP_STREAM_RESET_PERFORMED,
3685                     stcb->asoc.sending_seq,
3686                     stcb->asoc.mapping_array_base_tsn);
3687                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3688                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3689                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3690                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3691
3692                 asoc->str_reset_seq_in++;
3693         } else if (asoc->str_reset_seq_in - 1 == seq) {
3694                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3695                     stcb->asoc.last_sending_seq[0],
3696                     stcb->asoc.last_base_tsnsent[0]
3697                     );
3698         } else if (asoc->str_reset_seq_in - 2 == seq) {
3699                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3700                     stcb->asoc.last_sending_seq[1],
3701                     stcb->asoc.last_base_tsnsent[1]
3702                     );
3703         } else {
3704                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3705         }
3706         return (0);
3707 }
3708
3709 static void
3710 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3711     struct sctp_tmit_chunk *chk,
3712     struct sctp_stream_reset_out_request *req, int trunc)
3713 {
3714         uint32_t seq, tsn;
3715         int number_entries, len;
3716         struct sctp_association *asoc = &stcb->asoc;
3717
3718         seq = ntohl(req->request_seq);
3719
3720         /* now if its not a duplicate we process it */
3721         if (asoc->str_reset_seq_in == seq) {
3722                 len = ntohs(req->ph.param_length);
3723                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3724                 /*
3725                  * the sender is resetting, handle the list issue.. we must
3726                  * a) verify if we can do the reset, if so no problem b) If
3727                  * we can't do the reset we must copy the request. c) queue
3728                  * it, and setup the data in processor to trigger it off
3729                  * when needed and dequeue all the queued data.
3730                  */
3731                 tsn = ntohl(req->send_reset_at_tsn);
3732
3733                 /* move the reset action back one */
3734                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3735                 if (trunc) {
3736                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3737                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3738                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3739                         /* we can do it now */
3740                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3741                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3742                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3743                 } else {
3744                         /*
3745                          * we must queue it up and thus wait for the TSN's
3746                          * to arrive that are at or before tsn
3747                          */
3748                         struct sctp_stream_reset_list *liste;
3749                         int siz;
3750
3751                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3752                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3753                             siz, SCTP_M_STRESET);
3754                         if (liste == NULL) {
3755                                 /* gak out of memory */
3756                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3757                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3758                                 return;
3759                         }
3760                         liste->tsn = tsn;
3761                         liste->number_entries = number_entries;
3762                         memcpy(&liste->req, req,
3763                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3764                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3765                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3766                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3767                 }
3768                 asoc->str_reset_seq_in++;
3769         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3770                 /*
3771                  * one seq back, just echo back last action since my
3772                  * response was lost.
3773                  */
3774                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3775         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3776                 /*
3777                  * two seq back, just echo back last action since my
3778                  * response was lost.
3779                  */
3780                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3781         } else {
3782                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3783         }
3784 }
3785
3786 static void
3787 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3788     struct sctp_stream_reset_add_strm *str_add)
3789 {
3790         /*
3791          * Peer is requesting to add more streams. If its within our
3792          * max-streams we will allow it.
3793          */
3794         uint16_t num_stream, i;
3795         uint32_t seq;
3796         struct sctp_association *asoc = &stcb->asoc;
3797         struct sctp_queued_to_read *ctl, *nctl;
3798
3799         /* Get the number. */
3800         seq = ntohl(str_add->request_seq);
3801         num_stream = ntohs(str_add->number_of_streams);
3802         /* Now what would be the new total? */
3803         if (asoc->str_reset_seq_in == seq) {
3804                 num_stream += stcb->asoc.streamincnt;
3805                 if (num_stream > stcb->asoc.max_inbound_streams) {
3806                         /* We must reject it they ask for to many */
3807         denied:
3808                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3809                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3810                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3811                 } else {
3812                         /* Ok, we can do that :-) */
3813                         struct sctp_stream_in *oldstrm;
3814
3815                         /* save off the old */
3816                         oldstrm = stcb->asoc.strmin;
3817                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3818                             (num_stream * sizeof(struct sctp_stream_in)),
3819                             SCTP_M_STRMI);
3820                         if (stcb->asoc.strmin == NULL) {
3821                                 stcb->asoc.strmin = oldstrm;
3822                                 goto denied;
3823                         }
3824                         /* copy off the old data */
3825                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3826                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3827                                 stcb->asoc.strmin[i].stream_no = i;
3828                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3829                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3830                                 /* now anything on those queues? */
3831                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3832                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3833                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3834                                 }
3835                         }
3836                         /* Init the new streams */
3837                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3838                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3839                                 stcb->asoc.strmin[i].stream_no = i;
3840                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3841                                 stcb->asoc.strmin[i].delivery_started = 0;
3842                         }
3843                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3844                         /* update the size */
3845                         stcb->asoc.streamincnt = num_stream;
3846                         /* Send the ack */
3847                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3848                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3849                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3850                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3851                             (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3852                 }
3853         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3854                 /*
3855                  * one seq back, just echo back last action since my
3856                  * response was lost.
3857                  */
3858                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3859         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3860                 /*
3861                  * two seq back, just echo back last action since my
3862                  * response was lost.
3863                  */
3864                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3865         } else {
3866                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3867
3868         }
3869 }
3870
3871 #ifdef __GNUC__
3872 __attribute__((noinline))
3873 #endif
3874         static int
3875             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3876         struct sctp_stream_reset_out_req *sr_req)
3877 {
3878         int chk_length, param_len, ptype;
3879         struct sctp_paramhdr pstore;
3880         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3881
3882         uint32_t seq;
3883         int num_req = 0;
3884         int trunc = 0;
3885         struct sctp_tmit_chunk *chk;
3886         struct sctp_chunkhdr *ch;
3887         struct sctp_paramhdr *ph;
3888         int ret_code = 0;
3889         int num_param = 0;
3890
3891         /* now it may be a reset or a reset-response */
3892         chk_length = ntohs(sr_req->ch.chunk_length);
3893
3894         /* setup for adding the response */
3895         sctp_alloc_a_chunk(stcb, chk);
3896         if (chk == NULL) {
3897                 return (ret_code);
3898         }
3899         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3900         chk->rec.chunk_id.can_take_data = 0;
3901         chk->asoc = &stcb->asoc;
3902         chk->no_fr_allowed = 0;
3903         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3904         chk->book_size_scale = 0;
3905         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
3906         if (chk->data == NULL) {
3907 strres_nochunk:
3908                 if (chk->data) {
3909                         sctp_m_freem(chk->data);
3910                         chk->data = NULL;
3911                 }
3912                 sctp_free_a_chunk(stcb, chk);
3913                 return (ret_code);
3914         }
3915         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3916
3917         /* setup chunk parameters */
3918         chk->sent = SCTP_DATAGRAM_UNSENT;
3919         chk->snd_count = 0;
3920         chk->whoTo = stcb->asoc.primary_destination;
3921         atomic_add_int(&chk->whoTo->ref_count, 1);
3922
3923         ch = mtod(chk->data, struct sctp_chunkhdr *);
3924         ch->chunk_type = SCTP_STREAM_RESET;
3925         ch->chunk_flags = 0;
3926         ch->chunk_length = htons(chk->send_size);
3927         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
3928         offset += sizeof(struct sctp_chunkhdr);
3929         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
3930                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
3931                 if (ph == NULL)
3932                         break;
3933                 param_len = ntohs(ph->param_length);
3934                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
3935                         /* bad param */
3936                         break;
3937                 }
3938                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
3939                     (uint8_t *) & cstore);
3940                 ptype = ntohs(ph->param_type);
3941                 num_param++;
3942                 if (param_len > (int)sizeof(cstore)) {
3943                         trunc = 1;
3944                 } else {
3945                         trunc = 0;
3946                 }
3947
3948                 if (num_param > SCTP_MAX_RESET_PARAMS) {
3949                         /* hit the max of parameters already sorry.. */
3950                         break;
3951                 }
3952                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
3953                         struct sctp_stream_reset_out_request *req_out;
3954
3955                         req_out = (struct sctp_stream_reset_out_request *)ph;
3956                         num_req++;
3957                         if (stcb->asoc.stream_reset_outstanding) {
3958                                 seq = ntohl(req_out->response_seq);
3959                                 if (seq == stcb->asoc.str_reset_seq_out) {
3960                                         /* implicit ack */
3961                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
3962                                 }
3963                         }
3964                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
3965                 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
3966                         struct sctp_stream_reset_add_strm *str_add;
3967
3968                         str_add = (struct sctp_stream_reset_add_strm *)ph;
3969                         num_req++;
3970                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
3971                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
3972                         struct sctp_stream_reset_in_request *req_in;
3973
3974                         num_req++;
3975
3976                         req_in = (struct sctp_stream_reset_in_request *)ph;
3977
3978                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
3979                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
3980                         struct sctp_stream_reset_tsn_request *req_tsn;
3981
3982                         num_req++;
3983                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
3984
3985                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
3986                                 ret_code = 1;
3987                                 goto strres_nochunk;
3988                         }
3989                         /* no more */
3990                         break;
3991                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
3992                         struct sctp_stream_reset_response *resp;
3993                         uint32_t result;
3994
3995                         resp = (struct sctp_stream_reset_response *)ph;
3996                         seq = ntohl(resp->response_seq);
3997                         result = ntohl(resp->result);
3998                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
3999                                 ret_code = 1;
4000                                 goto strres_nochunk;
4001                         }
4002                 } else {
4003                         break;
4004                 }
4005                 offset += SCTP_SIZE32(param_len);
4006                 chk_length -= SCTP_SIZE32(param_len);
4007         }
4008         if (num_req == 0) {
4009                 /* we have no response free the stuff */
4010                 goto strres_nochunk;
4011         }
4012         /* ok we have a chunk to link in */
4013         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4014             chk,
4015             sctp_next);
4016         stcb->asoc.ctrl_queue_cnt++;
4017         return (ret_code);
4018 }
4019
4020 /*
4021  * Handle a router or endpoints report of a packet loss, there are two ways
4022  * to handle this, either we get the whole packet and must disect it
4023  * ourselves (possibly with truncation and or corruption) or it is a summary
4024  * from a middle box that did the disectting for us.
4025  */
4026 static void
4027 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4028     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4029 {
4030         uint32_t bottle_bw, on_queue;
4031         uint16_t trunc_len;
4032         unsigned int chlen;
4033         unsigned int at;
4034         struct sctp_chunk_desc desc;
4035         struct sctp_chunkhdr *ch;
4036
4037         chlen = ntohs(cp->ch.chunk_length);
4038         chlen -= sizeof(struct sctp_pktdrop_chunk);
4039         /* XXX possible chlen underflow */
4040         if (chlen == 0) {
4041                 ch = NULL;
4042                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4043                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4044         } else {
4045                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4046                 chlen -= sizeof(struct sctphdr);
4047                 /* XXX possible chlen underflow */
4048                 memset(&desc, 0, sizeof(desc));
4049         }
4050         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4051         if (trunc_len > limit) {
4052                 trunc_len = limit;
4053         }
4054         /* now the chunks themselves */
4055         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4056                 desc.chunk_type = ch->chunk_type;
4057                 /* get amount we need to move */
4058                 at = ntohs(ch->chunk_length);
4059                 if (at < sizeof(struct sctp_chunkhdr)) {
4060                         /* corrupt chunk, maybe at the end? */
4061                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4062                         break;
4063                 }
4064                 if (trunc_len == 0) {
4065                         /* we are supposed to have all of it */
4066                         if (at > chlen) {
4067                                 /* corrupt skip it */
4068                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4069                                 break;
4070                         }
4071                 } else {
4072                         /* is there enough of it left ? */
4073                         if (desc.chunk_type == SCTP_DATA) {
4074                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4075                                     sizeof(desc.data_bytes))) {
4076                                         break;
4077                                 }
4078                         } else {
4079                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4080                                         break;
4081                                 }
4082                         }
4083                 }
4084                 if (desc.chunk_type == SCTP_DATA) {
4085                         /* can we get out the tsn? */
4086                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4087                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4088
4089                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4090                                 /* yep */
4091                                 struct sctp_data_chunk *dcp;
4092                                 uint8_t *ddp;
4093                                 unsigned int iii;
4094
4095                                 dcp = (struct sctp_data_chunk *)ch;
4096                                 ddp = (uint8_t *) (dcp + 1);
4097                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4098                                         desc.data_bytes[iii] = ddp[iii];
4099                                 }
4100                                 desc.tsn_ifany = dcp->dp.tsn;
4101                         } else {
4102                                 /* nope we are done. */
4103                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4104                                 break;
4105                         }
4106                 } else {
4107                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4108                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4109                 }
4110
4111                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4112                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4113                         break;
4114                 }
4115                 if (SCTP_SIZE32(at) > chlen) {
4116                         break;
4117                 }
4118                 chlen -= SCTP_SIZE32(at);
4119                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4120                         /* done, none left */
4121                         break;
4122                 }
4123                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4124         }
4125         /* Now update any rwnd --- possibly */
4126         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4127                 /* From a peer, we get a rwnd report */
4128                 uint32_t a_rwnd;
4129
4130                 SCTP_STAT_INCR(sctps_pdrpfehos);
4131
4132                 bottle_bw = ntohl(cp->bottle_bw);
4133                 on_queue = ntohl(cp->current_onq);
4134                 if (bottle_bw && on_queue) {
4135                         /* a rwnd report is in here */
4136                         if (bottle_bw > on_queue)
4137                                 a_rwnd = bottle_bw - on_queue;
4138                         else
4139                                 a_rwnd = 0;
4140
4141                         if (a_rwnd == 0)
4142                                 stcb->asoc.peers_rwnd = 0;
4143                         else {
4144                                 if (a_rwnd > stcb->asoc.total_flight) {
4145                                         stcb->asoc.peers_rwnd =
4146                                             a_rwnd - stcb->asoc.total_flight;
4147                                 } else {
4148                                         stcb->asoc.peers_rwnd = 0;
4149                                 }
4150                                 if (stcb->asoc.peers_rwnd <
4151                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4152                                         /* SWS sender side engages */
4153                                         stcb->asoc.peers_rwnd = 0;
4154                                 }
4155                         }
4156                 }
4157         } else {
4158                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4159         }
4160
4161         /* now middle boxes in sat networks get a cwnd bump */
4162         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4163             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4164             (stcb->asoc.sat_network)) {
4165                 /*
4166                  * This is debateable but for sat networks it makes sense
4167                  * Note if a T3 timer has went off, we will prohibit any
4168                  * changes to cwnd until we exit the t3 loss recovery.
4169                  */
4170                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4171                     net, cp, &bottle_bw, &on_queue);
4172         }
4173 }
4174
4175 /*
4176  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4177  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4178  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4179  * length of the complete packet outputs: - length: modified to remaining
4180  * length after control processing - netp: modified to new sctp_nets after
4181  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4182  * bad packet,...) otherwise return the tcb for this packet
4183  */
4184 #ifdef __GNUC__
4185 __attribute__((noinline))
4186 #endif
4187         static struct sctp_tcb *
4188                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4189              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4190              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4191              uint32_t vrf_id, uint16_t port)
4192 {
4193         struct sctp_association *asoc;
4194         uint32_t vtag_in;
4195         int num_chunks = 0;     /* number of control chunks processed */
4196         uint32_t chk_length;
4197         int ret;
4198         int abort_no_unlock = 0;
4199
4200         /*
4201          * How big should this be, and should it be alloc'd? Lets try the
4202          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4203          * until we get into jumbo grams and such..
4204          */
4205         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4206         struct sctp_tcb *locked_tcb = stcb;
4207         int got_auth = 0;
4208         uint32_t auth_offset = 0, auth_len = 0;
4209         int auth_skipped = 0;
4210         int asconf_cnt = 0;
4211
4212 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4213         struct socket *so;
4214
4215 #endif
4216
4217         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4218             iphlen, *offset, length, stcb);
4219
4220         /* validate chunk header length... */
4221         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4222                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4223                     ntohs(ch->chunk_length));
4224                 if (locked_tcb) {
4225                         SCTP_TCB_UNLOCK(locked_tcb);
4226                 }
4227                 return (NULL);
4228         }
4229         /*
4230          * validate the verification tag
4231          */
4232         vtag_in = ntohl(sh->v_tag);
4233
4234         if (locked_tcb) {
4235                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4236         }
4237         if (ch->chunk_type == SCTP_INITIATION) {
4238                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4239                     ntohs(ch->chunk_length), vtag_in);
4240                 if (vtag_in != 0) {
4241                         /* protocol error- silently discard... */
4242                         SCTP_STAT_INCR(sctps_badvtag);
4243                         if (locked_tcb) {
4244                                 SCTP_TCB_UNLOCK(locked_tcb);
4245                         }
4246                         return (NULL);
4247                 }
4248         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4249                 /*
4250                  * If there is no stcb, skip the AUTH chunk and process
4251                  * later after a stcb is found (to validate the lookup was
4252                  * valid.
4253                  */
4254                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4255                     (stcb == NULL) &&
4256                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4257                         /* save this chunk for later processing */
4258                         auth_skipped = 1;
4259                         auth_offset = *offset;
4260                         auth_len = ntohs(ch->chunk_length);
4261
4262                         /* (temporarily) move past this chunk */
4263                         *offset += SCTP_SIZE32(auth_len);
4264                         if (*offset >= length) {
4265                                 /* no more data left in the mbuf chain */
4266                                 *offset = length;
4267                                 if (locked_tcb) {
4268                                         SCTP_TCB_UNLOCK(locked_tcb);
4269                                 }
4270                                 return (NULL);
4271                         }
4272                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4273                             sizeof(struct sctp_chunkhdr), chunk_buf);
4274                 }
4275                 if (ch == NULL) {
4276                         /* Help */
4277                         *offset = length;
4278                         if (locked_tcb) {
4279                                 SCTP_TCB_UNLOCK(locked_tcb);
4280                         }
4281                         return (NULL);
4282                 }
4283                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4284                         goto process_control_chunks;
4285                 }
4286                 /*
4287                  * first check if it's an ASCONF with an unknown src addr we
4288                  * need to look inside to find the association
4289                  */
4290                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4291                         struct sctp_chunkhdr *asconf_ch = ch;
4292                         uint32_t asconf_offset = 0, asconf_len = 0;
4293
4294                         /* inp's refcount may be reduced */
4295                         SCTP_INP_INCR_REF(inp);
4296
4297                         asconf_offset = *offset;
4298                         do {
4299                                 asconf_len = ntohs(asconf_ch->chunk_length);
4300                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4301                                         break;
4302                                 stcb = sctp_findassociation_ep_asconf(m, iphlen,
4303                                     *offset, sh, &inp, netp, vrf_id);
4304                                 if (stcb != NULL)
4305                                         break;
4306                                 asconf_offset += SCTP_SIZE32(asconf_len);
4307                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4308                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4309                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4310                         if (stcb == NULL) {
4311                                 /*
4312                                  * reduce inp's refcount if not reduced in
4313                                  * sctp_findassociation_ep_asconf().
4314                                  */
4315                                 SCTP_INP_DECR_REF(inp);
4316                         } else {
4317                                 locked_tcb = stcb;
4318                         }
4319
4320                         /* now go back and verify any auth chunk to be sure */
4321                         if (auth_skipped && (stcb != NULL)) {
4322                                 struct sctp_auth_chunk *auth;
4323
4324                                 auth = (struct sctp_auth_chunk *)
4325                                     sctp_m_getptr(m, auth_offset,
4326                                     auth_len, chunk_buf);
4327                                 got_auth = 1;
4328                                 auth_skipped = 0;
4329                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4330                                     auth_offset)) {
4331                                         /* auth HMAC failed so dump it */
4332                                         *offset = length;
4333                                         if (locked_tcb) {
4334                                                 SCTP_TCB_UNLOCK(locked_tcb);
4335                                         }
4336                                         return (NULL);
4337                                 } else {
4338                                         /* remaining chunks are HMAC checked */
4339                                         stcb->asoc.authenticated = 1;
4340                                 }
4341                         }
4342                 }
4343                 if (stcb == NULL) {
4344                         /* no association, so it's out of the blue... */
4345                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4346                             vrf_id, port);
4347                         *offset = length;
4348                         if (locked_tcb) {
4349                                 SCTP_TCB_UNLOCK(locked_tcb);
4350                         }
4351                         return (NULL);
4352                 }
4353                 asoc = &stcb->asoc;
4354                 /* ABORT and SHUTDOWN can use either v_tag... */
4355                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4356                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4357                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4358                         if ((vtag_in == asoc->my_vtag) ||
4359                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4360                             (vtag_in == asoc->peer_vtag))) {
4361                                 /* this is valid */
4362                         } else {
4363                                 /* drop this packet... */
4364                                 SCTP_STAT_INCR(sctps_badvtag);
4365                                 if (locked_tcb) {
4366                                         SCTP_TCB_UNLOCK(locked_tcb);
4367                                 }
4368                                 return (NULL);
4369                         }
4370                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4371                         if (vtag_in != asoc->my_vtag) {
4372                                 /*
4373                                  * this could be a stale SHUTDOWN-ACK or the
4374                                  * peer never got the SHUTDOWN-COMPLETE and
4375                                  * is still hung; we have started a new asoc
4376                                  * but it won't complete until the shutdown
4377                                  * is completed
4378                                  */
4379                                 if (locked_tcb) {
4380                                         SCTP_TCB_UNLOCK(locked_tcb);
4381                                 }
4382                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4383                                     NULL, vrf_id, port);
4384                                 return (NULL);
4385                         }
4386                 } else {
4387                         /* for all other chunks, vtag must match */
4388                         if (vtag_in != asoc->my_vtag) {
4389                                 /* invalid vtag... */
4390                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4391                                     "invalid vtag: %xh, expect %xh\n",
4392                                     vtag_in, asoc->my_vtag);
4393                                 SCTP_STAT_INCR(sctps_badvtag);
4394                                 if (locked_tcb) {
4395                                         SCTP_TCB_UNLOCK(locked_tcb);
4396                                 }
4397                                 *offset = length;
4398                                 return (NULL);
4399                         }
4400                 }
4401         }                       /* end if !SCTP_COOKIE_ECHO */
4402         /*
4403          * process all control chunks...
4404          */
4405         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4406         /* EY */
4407             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4408             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4409             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4410                 /* implied cookie-ack.. we must have lost the ack */
4411                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4412                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4413                             stcb->asoc.overall_error_count,
4414                             0,
4415                             SCTP_FROM_SCTP_INPUT,
4416                             __LINE__);
4417                 }
4418                 stcb->asoc.overall_error_count = 0;
4419                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4420                     *netp);
4421         }
4422 process_control_chunks:
4423         while (IS_SCTP_CONTROL(ch)) {
4424                 /* validate chunk length */
4425                 chk_length = ntohs(ch->chunk_length);
4426                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4427                     ch->chunk_type, chk_length);
4428                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4429                 if (chk_length < sizeof(*ch) ||
4430                     (*offset + (int)chk_length) > length) {
4431                         *offset = length;
4432                         if (locked_tcb) {
4433                                 SCTP_TCB_UNLOCK(locked_tcb);
4434                         }
4435                         return (NULL);
4436                 }
4437                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4438                 /*
4439                  * INIT-ACK only gets the init ack "header" portion only
4440                  * because we don't have to process the peer's COOKIE. All
4441                  * others get a complete chunk.
4442                  */
4443                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4444                     (ch->chunk_type == SCTP_INITIATION)) {
4445                         /* get an init-ack chunk */
4446                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4447                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4448                         if (ch == NULL) {
4449                                 *offset = length;
4450                                 if (locked_tcb) {
4451                                         SCTP_TCB_UNLOCK(locked_tcb);
4452                                 }
4453                                 return (NULL);
4454                         }
4455                 } else {
4456                         /* For cookies and all other chunks. */
4457                         if (chk_length > sizeof(chunk_buf)) {
4458                                 /*
4459                                  * use just the size of the chunk buffer so
4460                                  * the front part of our chunks fit in
4461                                  * contiguous space up to the chunk buffer
4462                                  * size (508 bytes). For chunks that need to
4463                                  * get more than that they must use the
4464                                  * sctp_m_getptr() function or other means
4465                                  * (e.g. know how to parse mbuf chains).
4466                                  * Cookies do this already.
4467                                  */
4468                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4469                                     (sizeof(chunk_buf) - 4),
4470                                     chunk_buf);
4471                                 if (ch == NULL) {
4472                                         *offset = length;
4473                                         if (locked_tcb) {
4474                                                 SCTP_TCB_UNLOCK(locked_tcb);
4475                                         }
4476                                         return (NULL);
4477                                 }
4478                         } else {
4479                                 /* We can fit it all */
4480                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4481                                     chk_length, chunk_buf);
4482                                 if (ch == NULL) {
4483                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4484                                         *offset = length;
4485                                         if (locked_tcb) {
4486                                                 SCTP_TCB_UNLOCK(locked_tcb);
4487                                         }
4488                                         return (NULL);
4489                                 }
4490                         }
4491                 }
4492                 num_chunks++;
4493                 /* Save off the last place we got a control from */
4494                 if (stcb != NULL) {
4495                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4496                                 /*
4497                                  * allow last_control to be NULL if
4498                                  * ASCONF... ASCONF processing will find the
4499                                  * right net later
4500                                  */
4501                                 if ((netp != NULL) && (*netp != NULL))
4502                                         stcb->asoc.last_control_chunk_from = *netp;
4503                         }
4504                 }
4505 #ifdef SCTP_AUDITING_ENABLED
4506                 sctp_audit_log(0xB0, ch->chunk_type);
4507 #endif
4508
4509                 /* check to see if this chunk required auth, but isn't */
4510                 if ((stcb != NULL) &&
4511                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4512                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4513                     !stcb->asoc.authenticated) {
4514                         /* "silently" ignore */
4515                         SCTP_STAT_INCR(sctps_recvauthmissing);
4516                         goto next_chunk;
4517                 }
4518                 switch (ch->chunk_type) {
4519                 case SCTP_INITIATION:
4520                         /* must be first and only chunk */
4521                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4522                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4523                                 /* We are not interested anymore? */
4524                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4525                                         /*
4526                                          * collision case where we are
4527                                          * sending to them too
4528                                          */
4529                                         ;
4530                                 } else {
4531                                         if (locked_tcb) {
4532                                                 SCTP_TCB_UNLOCK(locked_tcb);
4533                                         }
4534                                         *offset = length;
4535                                         return (NULL);
4536                                 }
4537                         }
4538                         if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4539                             (num_chunks > 1) ||
4540                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4541                                 *offset = length;
4542                                 if (locked_tcb) {
4543                                         SCTP_TCB_UNLOCK(locked_tcb);
4544                                 }
4545                                 return (NULL);
4546                         }
4547                         if ((stcb != NULL) &&
4548                             (SCTP_GET_STATE(&stcb->asoc) ==
4549                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4550                                 sctp_send_shutdown_ack(stcb,
4551                                     stcb->asoc.primary_destination);
4552                                 *offset = length;
4553                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4554                                 if (locked_tcb) {
4555                                         SCTP_TCB_UNLOCK(locked_tcb);
4556                                 }
4557                                 return (NULL);
4558                         }
4559                         if (netp) {
4560                                 sctp_handle_init(m, iphlen, *offset, sh,
4561                                     (struct sctp_init_chunk *)ch, inp,
4562                                     stcb, *netp, &abort_no_unlock, vrf_id, port);
4563                         }
4564                         if (abort_no_unlock)
4565                                 return (NULL);
4566
4567                         *offset = length;
4568                         if (locked_tcb) {
4569                                 SCTP_TCB_UNLOCK(locked_tcb);
4570                         }
4571                         return (NULL);
4572                         break;
4573                 case SCTP_PAD_CHUNK:
4574                         break;
4575                 case SCTP_INITIATION_ACK:
4576                         /* must be first and only chunk */
4577                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4578                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4579                                 /* We are not interested anymore */
4580                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4581                                         ;
4582                                 } else {
4583                                         if (locked_tcb != stcb) {
4584                                                 /* Very unlikely */
4585                                                 SCTP_TCB_UNLOCK(locked_tcb);
4586                                         }
4587                                         *offset = length;
4588                                         if (stcb) {
4589 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4590                                                 so = SCTP_INP_SO(inp);
4591                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4592                                                 SCTP_TCB_UNLOCK(stcb);
4593                                                 SCTP_SOCKET_LOCK(so, 1);
4594                                                 SCTP_TCB_LOCK(stcb);
4595                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4596 #endif
4597                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4598 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4599                                                 SCTP_SOCKET_UNLOCK(so, 1);
4600 #endif
4601                                         }
4602                                         return (NULL);
4603                                 }
4604                         }
4605                         if ((num_chunks > 1) ||
4606                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4607                                 *offset = length;
4608                                 if (locked_tcb) {
4609                                         SCTP_TCB_UNLOCK(locked_tcb);
4610                                 }
4611                                 return (NULL);
4612                         }
4613                         if ((netp) && (*netp)) {
4614                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4615                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4616                         } else {
4617                                 ret = -1;
4618                         }
4619                         /*
4620                          * Special case, I must call the output routine to
4621                          * get the cookie echoed
4622                          */
4623                         if (abort_no_unlock)
4624                                 return (NULL);
4625
4626                         if ((stcb) && ret == 0)
4627                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4628                         *offset = length;
4629                         if (locked_tcb) {
4630                                 SCTP_TCB_UNLOCK(locked_tcb);
4631                         }
4632                         return (NULL);
4633                         break;
4634                 case SCTP_SELECTIVE_ACK:
4635                         {
4636                                 struct sctp_sack_chunk *sack;
4637                                 int abort_now = 0;
4638                                 uint32_t a_rwnd, cum_ack;
4639                                 uint16_t num_seg, num_dup;
4640                                 uint8_t flags;
4641                                 int offset_seg, offset_dup;
4642
4643                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4644                                 SCTP_STAT_INCR(sctps_recvsacks);
4645                                 if (stcb == NULL) {
4646                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4647                                         break;
4648                                 }
4649                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4650                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4651                                         break;
4652                                 }
4653                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4654                                         /*-
4655                                          * If we have sent a shutdown-ack, we will pay no
4656                                          * attention to a sack sent in to us since
4657                                          * we don't care anymore.
4658                                          */
4659                                         break;
4660                                 }
4661                                 sack = (struct sctp_sack_chunk *)ch;
4662                                 flags = ch->chunk_flags;
4663                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4664                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4665                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4666                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4667                                 if (sizeof(struct sctp_sack_chunk) +
4668                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4669                                     num_dup * sizeof(uint32_t) != chk_length) {
4670                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4671                                         break;
4672                                 }
4673                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4674                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4675                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4676                                     cum_ack, num_seg, a_rwnd);
4677                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4678                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4679                                     (num_seg == 0) &&
4680                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4681                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4682                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4683                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4684                                     ) {
4685                                         /*
4686                                          * We have a SIMPLE sack having no
4687                                          * prior segments and data on sent
4688                                          * queue to be acked.. Use the
4689                                          * faster path sack processing. We
4690                                          * also allow window update sacks
4691                                          * with no missing segments to go
4692                                          * this way too.
4693                                          */
4694                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now);
4695                                 } else {
4696                                         if (netp && *netp)
4697                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4698                                                     stcb, *netp,
4699                                                     num_seg, 0, num_dup, &abort_now, flags,
4700                                                     cum_ack, a_rwnd);
4701                                 }
4702                                 if (abort_now) {
4703                                         /* ABORT signal from sack processing */
4704                                         *offset = length;
4705                                         return (NULL);
4706                                 }
4707                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4708                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4709                                     (stcb->asoc.stream_queue_cnt == 0)) {
4710                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4711                                 }
4712                         }
4713                         break;
4714                         /*
4715                          * EY - nr_sack:  If the received chunk is an
4716                          * nr_sack chunk
4717                          */
4718                 case SCTP_NR_SELECTIVE_ACK:
4719                         {
4720                                 struct sctp_nr_sack_chunk *nr_sack;
4721                                 int abort_now = 0;
4722                                 uint32_t a_rwnd, cum_ack;
4723                                 uint16_t num_seg, num_nr_seg, num_dup;
4724                                 uint8_t flags;
4725                                 int offset_seg, offset_dup;
4726
4727                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4728                                 SCTP_STAT_INCR(sctps_recvsacks);
4729                                 if (stcb == NULL) {
4730                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4731                                         break;
4732                                 }
4733                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4734                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4735                                         goto unknown_chunk;
4736                                 }
4737                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4738                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4739                                         break;
4740                                 }
4741                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4742                                         /*-
4743                                          * If we have sent a shutdown-ack, we will pay no
4744                                          * attention to a sack sent in to us since
4745                                          * we don't care anymore.
4746                                          */
4747                                         break;
4748                                 }
4749                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4750                                 flags = ch->chunk_flags;
4751                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4752                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4753                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4754                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4755                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4756                                 if (sizeof(struct sctp_nr_sack_chunk) +
4757                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4758                                     num_dup * sizeof(uint32_t) != chk_length) {
4759                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4760                                         break;
4761                                 }
4762                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4763                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4764                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4765                                     cum_ack, num_seg, a_rwnd);
4766                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4767                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4768                                     (num_seg == 0) && (num_nr_seg == 0) &&
4769                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4770                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4771                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4772                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4773                                         /*
4774                                          * We have a SIMPLE sack having no
4775                                          * prior segments and data on sent
4776                                          * queue to be acked. Use the faster
4777                                          * path sack processing. We also
4778                                          * allow window update sacks with no
4779                                          * missing segments to go this way
4780                                          * too.
4781                                          */
4782                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4783                                             &abort_now);
4784                                 } else {
4785                                         if (netp && *netp)
4786                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4787                                                     stcb, *netp,
4788                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4789                                                     cum_ack, a_rwnd);
4790                                 }
4791                                 if (abort_now) {
4792                                         /* ABORT signal from sack processing */
4793                                         *offset = length;
4794                                         return (NULL);
4795                                 }
4796                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4797                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4798                                     (stcb->asoc.stream_queue_cnt == 0)) {
4799                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4800                                 }
4801                         }
4802                         break;
4803
4804                 case SCTP_HEARTBEAT_REQUEST:
4805                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4806                         if ((stcb) && netp && *netp) {
4807                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4808                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4809                                     chk_length, *netp);
4810
4811                                 /* He's alive so give him credit */
4812                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4813                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4814                                             stcb->asoc.overall_error_count,
4815                                             0,
4816                                             SCTP_FROM_SCTP_INPUT,
4817                                             __LINE__);
4818                                 }
4819                                 stcb->asoc.overall_error_count = 0;
4820                         }
4821                         break;
4822                 case SCTP_HEARTBEAT_ACK:
4823                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4824                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4825                                 /* Its not ours */
4826                                 *offset = length;
4827                                 if (locked_tcb) {
4828                                         SCTP_TCB_UNLOCK(locked_tcb);
4829                                 }
4830                                 return (NULL);
4831                         }
4832                         /* He's alive so give him credit */
4833                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4834                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4835                                     stcb->asoc.overall_error_count,
4836                                     0,
4837                                     SCTP_FROM_SCTP_INPUT,
4838                                     __LINE__);
4839                         }
4840                         stcb->asoc.overall_error_count = 0;
4841                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4842                         if (netp && *netp)
4843                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4844                                     stcb, *netp);
4845                         break;
4846                 case SCTP_ABORT_ASSOCIATION:
4847                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4848                             stcb);
4849                         if ((stcb) && netp && *netp)
4850                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4851                                     stcb, *netp);
4852                         *offset = length;
4853                         return (NULL);
4854                         break;
4855                 case SCTP_SHUTDOWN:
4856                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4857                             stcb);
4858                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4859                                 *offset = length;
4860                                 if (locked_tcb) {
4861                                         SCTP_TCB_UNLOCK(locked_tcb);
4862                                 }
4863                                 return (NULL);
4864                         }
4865                         if (netp && *netp) {
4866                                 int abort_flag = 0;
4867
4868                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4869                                     stcb, *netp, &abort_flag);
4870                                 if (abort_flag) {
4871                                         *offset = length;
4872                                         return (NULL);
4873                                 }
4874                         }
4875                         break;
4876                 case SCTP_SHUTDOWN_ACK:
4877                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4878                         if ((stcb) && (netp) && (*netp))
4879                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4880                         *offset = length;
4881                         return (NULL);
4882                         break;
4883
4884                 case SCTP_OPERATION_ERROR:
4885                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4886                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4887
4888                                 *offset = length;
4889                                 return (NULL);
4890                         }
4891                         break;
4892                 case SCTP_COOKIE_ECHO:
4893                         SCTPDBG(SCTP_DEBUG_INPUT3,
4894                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4895                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4896                                 ;
4897                         } else {
4898                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4899                                         /* We are not interested anymore */
4900                         abend:
4901                                         if (stcb) {
4902                                                 SCTP_TCB_UNLOCK(stcb);
4903                                         }
4904                                         *offset = length;
4905                                         return (NULL);
4906                                 }
4907                         }
4908                         /*
4909                          * First are we accepting? We do this again here
4910                          * since it is possible that a previous endpoint WAS
4911                          * listening responded to a INIT-ACK and then
4912                          * closed. We opened and bound.. and are now no
4913                          * longer listening.
4914                          */
4915
4916                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
4917                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4918                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4919                                         struct mbuf *oper;
4920                                         struct sctp_paramhdr *phdr;
4921
4922                                         oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
4923                                             0, M_DONTWAIT, 1, MT_DATA);
4924                                         if (oper) {
4925                                                 SCTP_BUF_LEN(oper) =
4926                                                     sizeof(struct sctp_paramhdr);
4927                                                 phdr = mtod(oper,
4928                                                     struct sctp_paramhdr *);
4929                                                 phdr->param_type =
4930                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
4931                                                 phdr->param_length =
4932                                                     htons(sizeof(struct sctp_paramhdr));
4933                                         }
4934                                         sctp_abort_association(inp, stcb, m,
4935                                             iphlen, sh, oper, vrf_id, port);
4936                                 }
4937                                 *offset = length;
4938                                 return (NULL);
4939                         } else {
4940                                 struct mbuf *ret_buf;
4941                                 struct sctp_inpcb *linp;
4942
4943                                 if (stcb) {
4944                                         linp = NULL;
4945                                 } else {
4946                                         linp = inp;
4947                                 }
4948
4949                                 if (linp) {
4950                                         SCTP_ASOC_CREATE_LOCK(linp);
4951                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4952                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4953                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
4954                                                 goto abend;
4955                                         }
4956                                 }
4957                                 if (netp) {
4958                                         ret_buf =
4959                                             sctp_handle_cookie_echo(m, iphlen,
4960                                             *offset, sh,
4961                                             (struct sctp_cookie_echo_chunk *)ch,
4962                                             &inp, &stcb, netp,
4963                                             auth_skipped,
4964                                             auth_offset,
4965                                             auth_len,
4966                                             &locked_tcb,
4967                                             vrf_id,
4968                                             port);
4969                                 } else {
4970                                         ret_buf = NULL;
4971                                 }
4972                                 if (linp) {
4973                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4974                                 }
4975                                 if (ret_buf == NULL) {
4976                                         if (locked_tcb) {
4977                                                 SCTP_TCB_UNLOCK(locked_tcb);
4978                                         }
4979                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4980                                             "GAK, null buffer\n");
4981                                         auth_skipped = 0;
4982                                         *offset = length;
4983                                         return (NULL);
4984                                 }
4985                                 /* if AUTH skipped, see if it verified... */
4986                                 if (auth_skipped) {
4987                                         got_auth = 1;
4988                                         auth_skipped = 0;
4989                                 }
4990                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
4991                                         /*
4992                                          * Restart the timer if we have
4993                                          * pending data
4994                                          */
4995                                         struct sctp_tmit_chunk *chk;
4996
4997                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
4998                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4999                                 }
5000                         }
5001                         break;
5002                 case SCTP_COOKIE_ACK:
5003                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5004                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5005                                 if (locked_tcb) {
5006                                         SCTP_TCB_UNLOCK(locked_tcb);
5007                                 }
5008                                 return (NULL);
5009                         }
5010                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5011                                 /* We are not interested anymore */
5012                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5013                                         ;
5014                                 } else if (stcb) {
5015 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5016                                         so = SCTP_INP_SO(inp);
5017                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5018                                         SCTP_TCB_UNLOCK(stcb);
5019                                         SCTP_SOCKET_LOCK(so, 1);
5020                                         SCTP_TCB_LOCK(stcb);
5021                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5022 #endif
5023                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5024 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5025                                         SCTP_SOCKET_UNLOCK(so, 1);
5026 #endif
5027                                         *offset = length;
5028                                         return (NULL);
5029                                 }
5030                         }
5031                         /* He's alive so give him credit */
5032                         if ((stcb) && netp && *netp) {
5033                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5034                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5035                                             stcb->asoc.overall_error_count,
5036                                             0,
5037                                             SCTP_FROM_SCTP_INPUT,
5038                                             __LINE__);
5039                                 }
5040                                 stcb->asoc.overall_error_count = 0;
5041                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5042                         }
5043                         break;
5044                 case SCTP_ECN_ECHO:
5045                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5046                         /* He's alive so give him credit */
5047                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5048                                 /* Its not ours */
5049                                 if (locked_tcb) {
5050                                         SCTP_TCB_UNLOCK(locked_tcb);
5051                                 }
5052                                 *offset = length;
5053                                 return (NULL);
5054                         }
5055                         if (stcb) {
5056                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5057                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5058                                             stcb->asoc.overall_error_count,
5059                                             0,
5060                                             SCTP_FROM_SCTP_INPUT,
5061                                             __LINE__);
5062                                 }
5063                                 stcb->asoc.overall_error_count = 0;
5064                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5065                                     stcb);
5066                         }
5067                         break;
5068                 case SCTP_ECN_CWR:
5069                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5070                         /* He's alive so give him credit */
5071                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5072                                 /* Its not ours */
5073                                 if (locked_tcb) {
5074                                         SCTP_TCB_UNLOCK(locked_tcb);
5075                                 }
5076                                 *offset = length;
5077                                 return (NULL);
5078                         }
5079                         if (stcb) {
5080                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5081                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5082                                             stcb->asoc.overall_error_count,
5083                                             0,
5084                                             SCTP_FROM_SCTP_INPUT,
5085                                             __LINE__);
5086                                 }
5087                                 stcb->asoc.overall_error_count = 0;
5088                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5089                         }
5090                         break;
5091                 case SCTP_SHUTDOWN_COMPLETE:
5092                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5093                         /* must be first and only chunk */
5094                         if ((num_chunks > 1) ||
5095                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5096                                 *offset = length;
5097                                 if (locked_tcb) {
5098                                         SCTP_TCB_UNLOCK(locked_tcb);
5099                                 }
5100                                 return (NULL);
5101                         }
5102                         if ((stcb) && netp && *netp) {
5103                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5104                                     stcb, *netp);
5105                         }
5106                         *offset = length;
5107                         return (NULL);
5108                         break;
5109                 case SCTP_ASCONF:
5110                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5111                         /* He's alive so give him credit */
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_asconf(m, *offset,
5122                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5123                                 asconf_cnt++;
5124                         }
5125                         break;
5126                 case SCTP_ASCONF_ACK:
5127                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5128                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5129                                 /* Its not ours */
5130                                 if (locked_tcb) {
5131                                         SCTP_TCB_UNLOCK(locked_tcb);
5132                                 }
5133                                 *offset = length;
5134                                 return (NULL);
5135                         }
5136                         if ((stcb) && netp && *netp) {
5137                                 /* He's alive so give him credit */
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_asconf_ack(m, *offset,
5147                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5148                                 if (abort_no_unlock)
5149                                         return (NULL);
5150                         }
5151                         break;
5152                 case SCTP_FORWARD_CUM_TSN:
5153                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5154                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5155                                 /* Its not ours */
5156                                 if (locked_tcb) {
5157                                         SCTP_TCB_UNLOCK(locked_tcb);
5158                                 }
5159                                 *offset = length;
5160                                 return (NULL);
5161                         }
5162                         /* He's alive so give him credit */
5163                         if (stcb) {
5164                                 int abort_flag = 0;
5165
5166                                 stcb->asoc.overall_error_count = 0;
5167                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5168                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5169                                             stcb->asoc.overall_error_count,
5170                                             0,
5171                                             SCTP_FROM_SCTP_INPUT,
5172                                             __LINE__);
5173                                 }
5174                                 *fwd_tsn_seen = 1;
5175                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5176                                         /* We are not interested anymore */
5177 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5178                                         so = SCTP_INP_SO(inp);
5179                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5180                                         SCTP_TCB_UNLOCK(stcb);
5181                                         SCTP_SOCKET_LOCK(so, 1);
5182                                         SCTP_TCB_LOCK(stcb);
5183                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5184 #endif
5185                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5186 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5187                                         SCTP_SOCKET_UNLOCK(so, 1);
5188 #endif
5189                                         *offset = length;
5190                                         return (NULL);
5191                                 }
5192                                 sctp_handle_forward_tsn(stcb,
5193                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5194                                 if (abort_flag) {
5195                                         *offset = length;
5196                                         return (NULL);
5197                                 } else {
5198                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5199                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5200                                                     stcb->asoc.overall_error_count,
5201                                                     0,
5202                                                     SCTP_FROM_SCTP_INPUT,
5203                                                     __LINE__);
5204                                         }
5205                                         stcb->asoc.overall_error_count = 0;
5206                                 }
5207
5208                         }
5209                         break;
5210                 case SCTP_STREAM_RESET:
5211                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5212                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5213                                 /* Its not ours */
5214                                 if (locked_tcb) {
5215                                         SCTP_TCB_UNLOCK(locked_tcb);
5216                                 }
5217                                 *offset = length;
5218                                 return (NULL);
5219                         }
5220                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5221                                 /* We are not interested anymore */
5222 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5223                                 so = SCTP_INP_SO(inp);
5224                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5225                                 SCTP_TCB_UNLOCK(stcb);
5226                                 SCTP_SOCKET_LOCK(so, 1);
5227                                 SCTP_TCB_LOCK(stcb);
5228                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5229 #endif
5230                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5231 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5232                                 SCTP_SOCKET_UNLOCK(so, 1);
5233 #endif
5234                                 *offset = length;
5235                                 return (NULL);
5236                         }
5237                         if (stcb->asoc.peer_supports_strreset == 0) {
5238                                 /*
5239                                  * hmm, peer should have announced this, but
5240                                  * we will turn it on since he is sending us
5241                                  * a stream reset.
5242                                  */
5243                                 stcb->asoc.peer_supports_strreset = 1;
5244                         }
5245                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5246                                 /* stop processing */
5247                                 *offset = length;
5248                                 return (NULL);
5249                         }
5250                         break;
5251                 case SCTP_PACKET_DROPPED:
5252                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5253                         /* re-get it all please */
5254                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5255                                 /* Its not ours */
5256                                 if (locked_tcb) {
5257                                         SCTP_TCB_UNLOCK(locked_tcb);
5258                                 }
5259                                 *offset = length;
5260                                 return (NULL);
5261                         }
5262                         if (ch && (stcb) && netp && (*netp)) {
5263                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5264                                     stcb, *netp,
5265                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5266
5267                         }
5268                         break;
5269
5270                 case SCTP_AUTHENTICATION:
5271                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5272                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5273                                 goto unknown_chunk;
5274
5275                         if (stcb == NULL) {
5276                                 /* save the first AUTH for later processing */
5277                                 if (auth_skipped == 0) {
5278                                         auth_offset = *offset;
5279                                         auth_len = chk_length;
5280                                         auth_skipped = 1;
5281                                 }
5282                                 /* skip this chunk (temporarily) */
5283                                 goto next_chunk;
5284                         }
5285                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5286                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5287                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5288                                 /* Its not ours */
5289                                 if (locked_tcb) {
5290                                         SCTP_TCB_UNLOCK(locked_tcb);
5291                                 }
5292                                 *offset = length;
5293                                 return (NULL);
5294                         }
5295                         if (got_auth == 1) {
5296                                 /* skip this chunk... it's already auth'd */
5297                                 goto next_chunk;
5298                         }
5299                         got_auth = 1;
5300                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5301                             m, *offset)) {
5302                                 /* auth HMAC failed so dump the packet */
5303                                 *offset = length;
5304                                 return (stcb);
5305                         } else {
5306                                 /* remaining chunks are HMAC checked */
5307                                 stcb->asoc.authenticated = 1;
5308                         }
5309                         break;
5310
5311                 default:
5312         unknown_chunk:
5313                         /* it's an unknown chunk! */
5314                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5315                                 struct mbuf *mm;
5316                                 struct sctp_paramhdr *phd;
5317
5318                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5319                                     0, M_DONTWAIT, 1, MT_DATA);
5320                                 if (mm) {
5321                                         phd = mtod(mm, struct sctp_paramhdr *);
5322                                         /*
5323                                          * We cheat and use param type since
5324                                          * we did not bother to define a
5325                                          * error cause struct. They are the
5326                                          * same basic format with different
5327                                          * names.
5328                                          */
5329                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5330                                         phd->param_length = htons(chk_length + sizeof(*phd));
5331                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5332                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5333                                             M_DONTWAIT);
5334                                         if (SCTP_BUF_NEXT(mm)) {
5335 #ifdef SCTP_MBUF_LOGGING
5336                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5337                                                         struct mbuf *mat;
5338
5339                                                         mat = SCTP_BUF_NEXT(mm);
5340                                                         while (mat) {
5341                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5342                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5343                                                                 }
5344                                                                 mat = SCTP_BUF_NEXT(mat);
5345                                                         }
5346                                                 }
5347 #endif
5348                                                 sctp_queue_op_err(stcb, mm);
5349                                         } else {
5350                                                 sctp_m_freem(mm);
5351                                         }
5352                                 }
5353                         }
5354                         if ((ch->chunk_type & 0x80) == 0) {
5355                                 /* discard this packet */
5356                                 *offset = length;
5357                                 return (stcb);
5358                         }       /* else skip this bad chunk and continue... */
5359                         break;
5360                 }               /* switch (ch->chunk_type) */
5361
5362
5363 next_chunk:
5364                 /* get the next chunk */
5365                 *offset += SCTP_SIZE32(chk_length);
5366                 if (*offset >= length) {
5367                         /* no more data left in the mbuf chain */
5368                         break;
5369                 }
5370                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5371                     sizeof(struct sctp_chunkhdr), chunk_buf);
5372                 if (ch == NULL) {
5373                         if (locked_tcb) {
5374                                 SCTP_TCB_UNLOCK(locked_tcb);
5375                         }
5376                         *offset = length;
5377                         return (NULL);
5378                 }
5379         }                       /* while */
5380
5381         if (asconf_cnt > 0 && stcb != NULL) {
5382                 sctp_send_asconf_ack(stcb);
5383         }
5384         return (stcb);
5385 }
5386
5387
5388 #ifdef INVARIANTS
5389 #ifdef __GNUC__
5390 __attribute__((noinline))
5391 #endif
5392         void
5393              sctp_validate_no_locks(struct sctp_inpcb *inp)
5394 {
5395         struct sctp_tcb *lstcb;
5396
5397         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5398                 if (mtx_owned(&lstcb->tcb_mtx)) {
5399                         panic("Own lock on stcb at return from input");
5400                 }
5401         }
5402         if (mtx_owned(&inp->inp_create_mtx)) {
5403                 panic("Own create lock on inp");
5404         }
5405         if (mtx_owned(&inp->inp_mtx)) {
5406                 panic("Own inp lock on inp");
5407         }
5408 }
5409
5410 #endif
5411
5412 /*
5413  * common input chunk processing (v4 and v6)
5414  */
5415 void
5416 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5417     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5418     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5419     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5420 {
5421         /*
5422          * Control chunk processing
5423          */
5424         uint32_t high_tsn;
5425         int fwd_tsn_seen = 0, data_processed = 0;
5426         struct mbuf *m = *mm;
5427         int abort_flag = 0;
5428         int un_sent;
5429         int cnt_ctrl_ready = 0;
5430
5431         SCTP_STAT_INCR(sctps_recvdatagrams);
5432 #ifdef SCTP_AUDITING_ENABLED
5433         sctp_audit_log(0xE0, 1);
5434         sctp_auditing(0, inp, stcb, net);
5435 #endif
5436
5437         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5438             m, iphlen, offset, length, stcb);
5439         if (stcb) {
5440                 /* always clear this before beginning a packet */
5441                 stcb->asoc.authenticated = 0;
5442                 stcb->asoc.seen_a_sack_this_pkt = 0;
5443                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5444                     stcb, stcb->asoc.state);
5445
5446                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5447                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5448                         /*-
5449                          * If we hit here, we had a ref count
5450                          * up when the assoc was aborted and the
5451                          * timer is clearing out the assoc, we should
5452                          * NOT respond to any packet.. its OOTB.
5453                          */
5454                         SCTP_TCB_UNLOCK(stcb);
5455                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5456                             vrf_id, port);
5457                         goto out_now;
5458                 }
5459         }
5460         if (IS_SCTP_CONTROL(ch)) {
5461                 /* process the control portion of the SCTP packet */
5462                 /* sa_ignore NO_NULL_CHK */
5463                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5464                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5465                 if (stcb) {
5466                         /*
5467                          * This covers us if the cookie-echo was there and
5468                          * it changes our INP.
5469                          */
5470                         inp = stcb->sctp_ep;
5471                         if ((net) && (port)) {
5472                                 if (net->port == 0) {
5473                                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5474                                 }
5475                                 net->port = port;
5476                         }
5477                 }
5478         } else {
5479                 /*
5480                  * no control chunks, so pre-process DATA chunks (these
5481                  * checks are taken care of by control processing)
5482                  */
5483
5484                 /*
5485                  * if DATA only packet, and auth is required, then punt...
5486                  * can't have authenticated without any AUTH (control)
5487                  * chunks
5488                  */
5489                 if ((stcb != NULL) &&
5490                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5491                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5492                         /* "silently" ignore */
5493                         SCTP_STAT_INCR(sctps_recvauthmissing);
5494                         SCTP_TCB_UNLOCK(stcb);
5495                         goto out_now;
5496                 }
5497                 if (stcb == NULL) {
5498                         /* out of the blue DATA chunk */
5499                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5500                             vrf_id, port);
5501                         goto out_now;
5502                 }
5503                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5504                         /* v_tag mismatch! */
5505                         SCTP_STAT_INCR(sctps_badvtag);
5506                         SCTP_TCB_UNLOCK(stcb);
5507                         goto out_now;
5508                 }
5509         }
5510
5511         if (stcb == NULL) {
5512                 /*
5513                  * no valid TCB for this packet, or we found it's a bad
5514                  * packet while processing control, or we're done with this
5515                  * packet (done or skip rest of data), so we drop it...
5516                  */
5517                 goto out_now;
5518         }
5519         /*
5520          * DATA chunk processing
5521          */
5522         /* plow through the data chunks while length > offset */
5523
5524         /*
5525          * Rest should be DATA only.  Check authentication state if AUTH for
5526          * DATA is required.
5527          */
5528         if ((length > offset) &&
5529             (stcb != NULL) &&
5530             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5531             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5532             !stcb->asoc.authenticated) {
5533                 /* "silently" ignore */
5534                 SCTP_STAT_INCR(sctps_recvauthmissing);
5535                 SCTPDBG(SCTP_DEBUG_AUTH1,
5536                     "Data chunk requires AUTH, skipped\n");
5537                 goto trigger_send;
5538         }
5539         if (length > offset) {
5540                 int retval;
5541
5542                 /*
5543                  * First check to make sure our state is correct. We would
5544                  * not get here unless we really did have a tag, so we don't
5545                  * abort if this happens, just dump the chunk silently.
5546                  */
5547                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5548                 case SCTP_STATE_COOKIE_ECHOED:
5549                         /*
5550                          * we consider data with valid tags in this state
5551                          * shows us the cookie-ack was lost. Imply it was
5552                          * there.
5553                          */
5554                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5555                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5556                                     stcb->asoc.overall_error_count,
5557                                     0,
5558                                     SCTP_FROM_SCTP_INPUT,
5559                                     __LINE__);
5560                         }
5561                         stcb->asoc.overall_error_count = 0;
5562                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5563                         break;
5564                 case SCTP_STATE_COOKIE_WAIT:
5565                         /*
5566                          * We consider OOTB any data sent during asoc setup.
5567                          */
5568                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5569                             vrf_id, port);
5570                         SCTP_TCB_UNLOCK(stcb);
5571                         goto out_now;
5572                         /* sa_ignore NOTREACHED */
5573                         break;
5574                 case SCTP_STATE_EMPTY:  /* should not happen */
5575                 case SCTP_STATE_INUSE:  /* should not happen */
5576                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5577                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5578                 default:
5579                         SCTP_TCB_UNLOCK(stcb);
5580                         goto out_now;
5581                         /* sa_ignore NOTREACHED */
5582                         break;
5583                 case SCTP_STATE_OPEN:
5584                 case SCTP_STATE_SHUTDOWN_SENT:
5585                         break;
5586                 }
5587                 /* plow through the data chunks while length > offset */
5588                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5589                     inp, stcb, net, &high_tsn);
5590                 if (retval == 2) {
5591                         /*
5592                          * The association aborted, NO UNLOCK needed since
5593                          * the association is destroyed.
5594                          */
5595                         goto out_now;
5596                 }
5597                 data_processed = 1;
5598                 /*
5599                  * Anything important needs to have been m_copy'ed in
5600                  * process_data
5601                  */
5602         }
5603         /* take care of ecn */
5604         if (stcb->asoc.ecn_allowed && ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5605                 /* Yep, we need to add a ECNE */
5606                 sctp_send_ecn_echo(stcb, net, high_tsn);
5607         }
5608         if ((data_processed == 0) && (fwd_tsn_seen)) {
5609                 int was_a_gap;
5610                 uint32_t highest_tsn;
5611
5612                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5613                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5614                 } else {
5615                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5616                 }
5617                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5618                 stcb->asoc.send_sack = 1;
5619                 sctp_sack_check(stcb, was_a_gap, &abort_flag);
5620                 if (abort_flag) {
5621                         /* Again, we aborted so NO UNLOCK needed */
5622                         goto out_now;
5623                 }
5624         } else if (fwd_tsn_seen) {
5625                 stcb->asoc.send_sack = 1;
5626         }
5627         /* trigger send of any chunks in queue... */
5628 trigger_send:
5629 #ifdef SCTP_AUDITING_ENABLED
5630         sctp_audit_log(0xE0, 2);
5631         sctp_auditing(1, inp, stcb, net);
5632 #endif
5633         SCTPDBG(SCTP_DEBUG_INPUT1,
5634             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5635             stcb->asoc.peers_rwnd,
5636             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5637             stcb->asoc.total_flight);
5638         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5639         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5640                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5641         }
5642         if (cnt_ctrl_ready ||
5643             ((un_sent) &&
5644             (stcb->asoc.peers_rwnd > 0 ||
5645             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5646                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5647                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5648                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5649         }
5650 #ifdef SCTP_AUDITING_ENABLED
5651         sctp_audit_log(0xE0, 3);
5652         sctp_auditing(2, inp, stcb, net);
5653 #endif
5654         SCTP_TCB_UNLOCK(stcb);
5655 out_now:
5656 #ifdef INVARIANTS
5657         sctp_validate_no_locks(inp);
5658 #endif
5659         return;
5660 }
5661
5662 #if 0
5663 static void
5664 sctp_print_mbuf_chain(struct mbuf *m)
5665 {
5666         for (; m; m = SCTP_BUF_NEXT(m)) {
5667                 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5668                 if (SCTP_BUF_IS_EXTENDED(m))
5669                         printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5670         }
5671 }
5672
5673 #endif
5674
5675 void
5676 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5677 {
5678 #ifdef SCTP_MBUF_LOGGING
5679         struct mbuf *mat;
5680
5681 #endif
5682         struct mbuf *m;
5683         int iphlen;
5684         uint32_t vrf_id = 0;
5685         uint8_t ecn_bits;
5686         struct ip *ip;
5687         struct sctphdr *sh;
5688         struct sctp_inpcb *inp = NULL;
5689         struct sctp_nets *net;
5690         struct sctp_tcb *stcb = NULL;
5691         struct sctp_chunkhdr *ch;
5692         int refcount_up = 0;
5693         int length, mlen, offset;
5694
5695 #if !defined(SCTP_WITH_NO_CSUM)
5696         uint32_t check, calc_check;
5697
5698 #endif
5699
5700         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5701                 SCTP_RELEASE_PKT(i_pak);
5702                 return;
5703         }
5704         mlen = SCTP_HEADER_LEN(i_pak);
5705         iphlen = off;
5706         m = SCTP_HEADER_TO_CHAIN(i_pak);
5707
5708         net = NULL;
5709         SCTP_STAT_INCR(sctps_recvpackets);
5710         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5711
5712
5713 #ifdef SCTP_MBUF_LOGGING
5714         /* Log in any input mbufs */
5715         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5716                 mat = m;
5717                 while (mat) {
5718                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5719                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5720                         }
5721                         mat = SCTP_BUF_NEXT(mat);
5722                 }
5723         }
5724 #endif
5725 #ifdef  SCTP_PACKET_LOGGING
5726         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5727                 sctp_packet_log(m, mlen);
5728 #endif
5729         /*
5730          * Must take out the iphlen, since mlen expects this (only effect lb
5731          * case)
5732          */
5733         mlen -= iphlen;
5734
5735         /*
5736          * Get IP, SCTP, and first chunk header together in first mbuf.
5737          */
5738         ip = mtod(m, struct ip *);
5739         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5740         if (SCTP_BUF_LEN(m) < offset) {
5741                 if ((m = m_pullup(m, offset)) == 0) {
5742                         SCTP_STAT_INCR(sctps_hdrops);
5743                         return;
5744                 }
5745                 ip = mtod(m, struct ip *);
5746         }
5747         /* validate mbuf chain length with IP payload length */
5748         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5749                 SCTP_STAT_INCR(sctps_hdrops);
5750                 goto bad;
5751         }
5752         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5753         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5754         SCTPDBG(SCTP_DEBUG_INPUT1,
5755             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5756
5757         /* SCTP does not allow broadcasts or multicasts */
5758         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5759                 goto bad;
5760         }
5761         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5762                 /*
5763                  * We only look at broadcast if its a front state, All
5764                  * others we will not have a tcb for anyway.
5765                  */
5766                 goto bad;
5767         }
5768         /* validate SCTP checksum */
5769         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5770             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5771             m->m_pkthdr.len,
5772             if_name(m->m_pkthdr.rcvif),
5773             m->m_pkthdr.csum_flags);
5774 #if defined(SCTP_WITH_NO_CSUM)
5775         SCTP_STAT_INCR(sctps_recvnocrc);
5776 #else
5777         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5778                 SCTP_STAT_INCR(sctps_recvhwcrc);
5779                 goto sctp_skip_csum_4;
5780         }
5781         check = sh->checksum;   /* save incoming checksum */
5782         sh->checksum = 0;       /* prepare for calc */
5783         calc_check = sctp_calculate_cksum(m, iphlen);
5784         sh->checksum = check;
5785         SCTP_STAT_INCR(sctps_recvswcrc);
5786         if (calc_check != check) {
5787                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5788                     calc_check, check, m, mlen, iphlen);
5789
5790                 stcb = sctp_findassociation_addr(m, iphlen,
5791                     offset - sizeof(*ch),
5792                     sh, ch, &inp, &net,
5793                     vrf_id);
5794                 if ((net) && (port)) {
5795                         if (net->port == 0) {
5796                                 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5797                         }
5798                         net->port = port;
5799                 }
5800                 if ((inp) && (stcb)) {
5801                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5802                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5803                 } else if ((inp != NULL) && (stcb == NULL)) {
5804                         refcount_up = 1;
5805                 }
5806                 SCTP_STAT_INCR(sctps_badsum);
5807                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5808                 goto bad;
5809         }
5810 sctp_skip_csum_4:
5811 #endif
5812         /* destination port of 0 is illegal, based on RFC2960. */
5813         if (sh->dest_port == 0) {
5814                 SCTP_STAT_INCR(sctps_hdrops);
5815                 goto bad;
5816         }
5817         /*
5818          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5819          * IP/SCTP/first chunk header...
5820          */
5821         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
5822             sh, ch, &inp, &net, vrf_id);
5823         if ((net) && (port)) {
5824                 if (net->port == 0) {
5825                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5826                 }
5827                 net->port = port;
5828         }
5829         /* inp's ref-count increased && stcb locked */
5830         if (inp == NULL) {
5831                 struct sctp_init_chunk *init_chk, chunk_buf;
5832
5833                 SCTP_STAT_INCR(sctps_noport);
5834 #ifdef ICMP_BANDLIM
5835                 /*
5836                  * we use the bandwidth limiting to protect against sending
5837                  * too many ABORTS all at once. In this case these count the
5838                  * same as an ICMP message.
5839                  */
5840                 if (badport_bandlim(0) < 0)
5841                         goto bad;
5842 #endif                          /* ICMP_BANDLIM */
5843                 SCTPDBG(SCTP_DEBUG_INPUT1,
5844                     "Sending a ABORT from packet entry!\n");
5845                 if (ch->chunk_type == SCTP_INITIATION) {
5846                         /*
5847                          * we do a trick here to get the INIT tag, dig in
5848                          * and get the tag from the INIT and put it in the
5849                          * common header.
5850                          */
5851                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5852                             iphlen + sizeof(*sh), sizeof(*init_chk),
5853                             (uint8_t *) & chunk_buf);
5854                         if (init_chk != NULL)
5855                                 sh->v_tag = init_chk->init.initiate_tag;
5856                 }
5857                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5858                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
5859                         goto bad;
5860                 }
5861                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5862                         goto bad;
5863                 }
5864                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5865                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5866                 goto bad;
5867         } else if (stcb == NULL) {
5868                 refcount_up = 1;
5869         }
5870 #ifdef IPSEC
5871         /*
5872          * I very much doubt any of the IPSEC stuff will work but I have no
5873          * idea, so I will leave it in place.
5874          */
5875         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5876                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5877                 SCTP_STAT_INCR(sctps_hdrops);
5878                 goto bad;
5879         }
5880 #endif                          /* IPSEC */
5881
5882         /*
5883          * common chunk processing
5884          */
5885         length = ip->ip_len + iphlen;
5886         offset -= sizeof(struct sctp_chunkhdr);
5887
5888         ecn_bits = ip->ip_tos;
5889
5890         /* sa_ignore NO_NULL_CHK */
5891         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
5892             inp, stcb, net, ecn_bits, vrf_id, port);
5893         /* inp's ref-count reduced && stcb unlocked */
5894         if (m) {
5895                 sctp_m_freem(m);
5896         }
5897         if ((inp) && (refcount_up)) {
5898                 /* reduce ref-count */
5899                 SCTP_INP_DECR_REF(inp);
5900         }
5901         return;
5902 bad:
5903         if (stcb) {
5904                 SCTP_TCB_UNLOCK(stcb);
5905         }
5906         if ((inp) && (refcount_up)) {
5907                 /* reduce ref-count */
5908                 SCTP_INP_DECR_REF(inp);
5909         }
5910         if (m) {
5911                 sctp_m_freem(m);
5912         }
5913         return;
5914 }
5915 void
5916 sctp_input(i_pak, off)
5917         struct mbuf *i_pak;
5918         int off;
5919 {
5920         sctp_input_with_port(i_pak, off, 0);
5921 }