sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $   */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/udp.h>
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
  86     struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  87     int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
  88 {
  89         struct sctp_init *init;
  90         struct mbuf *op_err;
  91         uint32_t init_limit;
  92
  93         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  94             stcb);
  95         if (stcb == NULL) {
  96                 SCTP_INP_RLOCK(inp);
  97                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
  98                         goto outnow;
  99                 }
 100         }
 101         op_err = NULL;
 102         init = &cp->init;
 103         /* First are we accepting? */
 104         if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
 105                 SCTPDBG(SCTP_DEBUG_INPUT2,
 106                     "sctp_handle_init: Abort, so_qlimit:%d\n",
 107                     inp->sctp_socket->so_qlimit);
 108                 /*
 109                  * FIX ME ?? What about TCP model and we have a
 110                  * match/restart case? Actually no fix is needed. the lookup
 111                  * will always find the existing assoc so stcb would not be
 112                  * NULL. It may be questionable to do this since we COULD
 113                  * just send back the INIT-ACK and hope that the app did
 114                  * accept()'s by the time the COOKIE was sent. But there is
 115                  * a price to pay for COOKIE generation and I don't want to
 116                  * pay it on the chance that the app will actually do some
 117                  * accepts(). The App just looses and should NOT be in this
 118                  * state :-)
 119                  */
 120                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 121                     vrf_id, port);
 122                 if (stcb)
 123                         *abort_no_unlock = 1;
 124                 goto outnow;
 125         }
 126         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 127                 /* Invalid length */
 128                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 129                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 130                     vrf_id, port);
 131                 if (stcb)
 132                         *abort_no_unlock = 1;
 133                 goto outnow;
 134         }
 135         /* validate parameters */
 136         if (init->initiate_tag == 0) {
 137                 /* protocol error... send abort */
 138                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 139                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 140                     vrf_id, port);
 141                 if (stcb)
 142                         *abort_no_unlock = 1;
 143                 goto outnow;
 144         }
 145         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 146                 /* invalid parameter... send abort */
 147                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 148                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 149                     vrf_id, port);
 150                 if (stcb)
 151                         *abort_no_unlock = 1;
 152                 goto outnow;
 153         }
 154         if (init->num_inbound_streams == 0) {
 155                 /* protocol error... send abort */
 156                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 157                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 158                     vrf_id, port);
 159                 if (stcb)
 160                         *abort_no_unlock = 1;
 161                 goto outnow;
 162         }
 163         if (init->num_outbound_streams == 0) {
 164                 /* protocol error... send abort */
 165                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 166                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 167                     vrf_id, port);
 168                 if (stcb)
 169                         *abort_no_unlock = 1;
 170                 goto outnow;
 171         }
 172         init_limit = offset + ntohs(cp->ch.chunk_length);
 173         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 174             init_limit)) {
 175                 /* auth parameter(s) error... send abort */
 176                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
 177                 if (stcb)
 178                         *abort_no_unlock = 1;
 179                 goto outnow;
 180         }
 181         /* send an INIT-ACK w/cookie */
 182         SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 183         sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
 184             ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 185 outnow:
 186         if (stcb == NULL) {
 187                 SCTP_INP_RUNLOCK(inp);
 188         }
 189 }
 190
 191 /*
 192  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 193  */
 194
 195 int
 196 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 197 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 198     SCTP_UNUSED
 199 #endif
 200 )
 201 {
 202         int unsent_data = 0;
 203         unsigned int i;
 204         struct sctp_stream_queue_pending *sp;
 205         struct sctp_association *asoc;
 206
 207         /*
 208          * This function returns the number of streams that have true unsent
 209          * data on them. Note that as it looks through it will clean up any
 210          * places that have old data that has been sent but left at top of
 211          * stream queue.
 212          */
 213         asoc = &stcb->asoc;
 214         SCTP_TCB_SEND_LOCK(stcb);
 215         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 216                 /* Check to see if some data queued */
 217                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 218                         /* sa_ignore FREED_MEMORY */
 219                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 220                         if (sp == NULL) {
 221                                 continue;
 222                         }
 223                         if ((sp->msg_is_complete) &&
 224                             (sp->length == 0) &&
 225                             (sp->sender_all_done)) {
 226                                 /*
 227                                  * We are doing differed cleanup. Last time
 228                                  * through when we took all the data the
 229                                  * sender_all_done was not set.
 230                                  */
 231                                 if (sp->put_last_out == 0) {
 232                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 233                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 234                                             sp->sender_all_done,
 235                                             sp->length,
 236                                             sp->msg_is_complete,
 237                                             sp->put_last_out);
 238                                 }
 239                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 240                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 241                                 if (sp->net) {
 242                                         sctp_free_remote_addr(sp->net);
 243                                         sp->net = NULL;
 244                                 }
 245                                 if (sp->data) {
 246                                         sctp_m_freem(sp->data);
 247                                         sp->data = NULL;
 248                                 }
 249                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 250                         } else {
 251                                 unsent_data++;
 252                                 break;
 253                         }
 254                 }
 255         }
 256         SCTP_TCB_SEND_UNLOCK(stcb);
 257         return (unsent_data);
 258 }
 259
 260 static int
 261 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 262 {
 263         struct sctp_init *init;
 264         struct sctp_association *asoc;
 265         struct sctp_nets *lnet;
 266         unsigned int i;
 267
 268         init = &cp->init;
 269         asoc = &stcb->asoc;
 270         /* save off parameters */
 271         asoc->peer_vtag = ntohl(init->initiate_tag);
 272         asoc->peers_rwnd = ntohl(init->a_rwnd);
 273         /* init tsn's */
 274         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 275
 276         if (!TAILQ_EMPTY(&asoc->nets)) {
 277                 /* update any ssthresh's that may have a default */
 278                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 279                         lnet->ssthresh = asoc->peers_rwnd;
 280                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 281                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 282                         }
 283                 }
 284         }
 285         SCTP_TCB_SEND_LOCK(stcb);
 286         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 287                 unsigned int newcnt;
 288                 struct sctp_stream_out *outs;
 289                 struct sctp_stream_queue_pending *sp, *nsp;
 290                 struct sctp_tmit_chunk *chk, *nchk;
 291
 292                 /* abandon the upper streams */
 293                 newcnt = ntohs(init->num_inbound_streams);
 294                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 295                         if (chk->rec.data.stream_number >= newcnt) {
 296                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 297                                 asoc->send_queue_cnt--;
 298                                 if (chk->data != NULL) {
 299                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 300                                         sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
 301                                             SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED);
 302                                         if (chk->data) {
 303                                                 sctp_m_freem(chk->data);
 304                                                 chk->data = NULL;
 305                                         }
 306                                 }
 307                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 308                                 /* sa_ignore FREED_MEMORY */
 309                         }
 310                 }
 311                 if (asoc->strmout) {
 312                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 313                                 outs = &asoc->strmout[i];
 314                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 315                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 316                                         asoc->stream_queue_cnt--;
 317                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 318                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
 319                                             sp, SCTP_SO_NOT_LOCKED);
 320                                         if (sp->data) {
 321                                                 sctp_m_freem(sp->data);
 322                                                 sp->data = NULL;
 323                                         }
 324                                         if (sp->net) {
 325                                                 sctp_free_remote_addr(sp->net);
 326                                                 sp->net = NULL;
 327                                         }
 328                                         /* Free the chunk */
 329                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 330                                         /* sa_ignore FREED_MEMORY */
 331                                 }
 332                         }
 333                 }
 334                 /* cut back the count */
 335                 asoc->pre_open_streams = newcnt;
 336         }
 337         SCTP_TCB_SEND_UNLOCK(stcb);
 338         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 339
 340         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 341         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 342         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 343                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 344         }
 345         /* This is the next one we expect */
 346         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 347
 348         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 349         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 350
 351         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 352         /* open the requested streams */
 353
 354         if (asoc->strmin != NULL) {
 355                 /* Free the old ones */
 356                 struct sctp_queued_to_read *ctl, *nctl;
 357
 358                 for (i = 0; i < asoc->streamincnt; i++) {
 359                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 360                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 361                                 sctp_free_remote_addr(ctl->whoFrom);
 362                                 ctl->whoFrom = NULL;
 363                                 sctp_m_freem(ctl->data);
 364                                 ctl->data = NULL;
 365                                 sctp_free_a_readq(stcb, ctl);
 366                         }
 367                 }
 368                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 369         }
 370         asoc->streamincnt = ntohs(init->num_outbound_streams);
 371         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 372                 asoc->streamincnt = MAX_SCTP_STREAMS;
 373         }
 374         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 375             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 376         if (asoc->strmin == NULL) {
 377                 /* we didn't get memory for the streams! */
 378                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 379                 return (-1);
 380         }
 381         for (i = 0; i < asoc->streamincnt; i++) {
 382                 asoc->strmin[i].stream_no = i;
 383                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 384                 /*
 385                  * U-stream ranges will be set when the cookie is unpacked.
 386                  * Or for the INIT sender they are un set (if pr-sctp not
 387                  * supported) when the INIT-ACK arrives.
 388                  */
 389                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 390                 asoc->strmin[i].delivery_started = 0;
 391         }
 392         /*
 393          * load_address_from_init will put the addresses into the
 394          * association when the COOKIE is processed or the INIT-ACK is
 395          * processed. Both types of COOKIE's existing and new call this
 396          * routine. It will remove addresses that are no longer in the
 397          * association (for the restarting case where addresses are
 398          * removed). Up front when the INIT arrives we will discard it if it
 399          * is a restart and new addresses have been added.
 400          */
 401         /* sa_ignore MEMLEAK */
 402         return (0);
 403 }
 404
 405 /*
 406  * INIT-ACK message processing/consumption returns value < 0 on error
 407  */
 408 static int
 409 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 410     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 411     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 412 {
 413         struct sctp_association *asoc;
 414         struct mbuf *op_err;
 415         int retval, abort_flag;
 416         uint32_t initack_limit;
 417         int nat_friendly = 0;
 418
 419         /* First verify that we have no illegal param's */
 420         abort_flag = 0;
 421         op_err = NULL;
 422
 423         op_err = sctp_arethere_unrecognized_parameters(m,
 424             (offset + sizeof(struct sctp_init_chunk)),
 425             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 426         if (abort_flag) {
 427                 /* Send an abort and notify peer */
 428                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
 429                 *abort_no_unlock = 1;
 430                 return (-1);
 431         }
 432         asoc = &stcb->asoc;
 433         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 434         /* process the peer's parameters in the INIT-ACK */
 435         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 436         if (retval < 0) {
 437                 return (retval);
 438         }
 439         initack_limit = offset + ntohs(cp->ch.chunk_length);
 440         /* load all addresses */
 441         if ((retval = sctp_load_addresses_from_init(stcb, m,
 442             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 443             NULL))) {
 444                 /* Huh, we should abort */
 445                 SCTPDBG(SCTP_DEBUG_INPUT1,
 446                     "Load addresses from INIT causes an abort %d\n",
 447                     retval);
 448                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 449                     NULL, 0, net->port);
 450                 *abort_no_unlock = 1;
 451                 return (-1);
 452         }
 453         /* if the peer doesn't support asconf, flush the asconf queue */
 454         if (asoc->peer_supports_asconf == 0) {
 455                 struct sctp_asconf_addr *param, *nparam;
 456
 457                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 458                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 459                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 460                 }
 461         }
 462         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 463             stcb->asoc.local_hmacs);
 464         if (op_err) {
 465                 sctp_queue_op_err(stcb, op_err);
 466                 /* queuing will steal away the mbuf chain to the out queue */
 467                 op_err = NULL;
 468         }
 469         /* extract the cookie and queue it to "echo" it back... */
 470         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 471                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 472                     stcb->asoc.overall_error_count,
 473                     0,
 474                     SCTP_FROM_SCTP_INPUT,
 475                     __LINE__);
 476         }
 477         stcb->asoc.overall_error_count = 0;
 478         net->error_count = 0;
 479
 480         /*
 481          * Cancel the INIT timer, We do this first before queueing the
 482          * cookie. We always cancel at the primary to assue that we are
 483          * canceling the timer started by the INIT which always goes to the
 484          * primary.
 485          */
 486         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 487             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 488
 489         /* calculate the RTO */
 490         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 491             SCTP_RTT_FROM_NON_DATA);
 492
 493         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 494         if (retval < 0) {
 495                 /*
 496                  * No cookie, we probably should send a op error. But in any
 497                  * case if there is no cookie in the INIT-ACK, we can
 498                  * abandon the peer, its broke.
 499                  */
 500                 if (retval == -3) {
 501                         /* We abort with an error of missing mandatory param */
 502                         op_err =
 503                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 504                         if (op_err) {
 505                                 /*
 506                                  * Expand beyond to include the mandatory
 507                                  * param cookie
 508                                  */
 509                                 struct sctp_inv_mandatory_param *mp;
 510
 511                                 SCTP_BUF_LEN(op_err) =
 512                                     sizeof(struct sctp_inv_mandatory_param);
 513                                 mp = mtod(op_err,
 514                                     struct sctp_inv_mandatory_param *);
 515                                 /* Subtract the reserved param */
 516                                 mp->length =
 517                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 518                                 mp->num_param = htonl(1);
 519                                 mp->param = htons(SCTP_STATE_COOKIE);
 520                                 mp->resv = 0;
 521                         }
 522                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 523                             sh, op_err, vrf_id, net->port);
 524                         *abort_no_unlock = 1;
 525                 }
 526                 return (retval);
 527         }
 528         return (0);
 529 }
 530
 531 static void
 532 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 533     struct sctp_tcb *stcb, struct sctp_nets *net)
 534 {
 535         struct sockaddr_storage store;
 536         struct sctp_nets *r_net, *f_net;
 537         struct timeval tv;
 538         int req_prim = 0;
 539         uint16_t old_error_counter;
 540
 541 #ifdef INET
 542         struct sockaddr_in *sin;
 543
 544 #endif
 545 #ifdef INET6
 546         struct sockaddr_in6 *sin6;
 547
 548 #endif
 549
 550         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 551                 /* Invalid length */
 552                 return;
 553         }
 554         memset(&store, 0, sizeof(store));
 555         switch (cp->heartbeat.hb_info.addr_family) {
 556 #ifdef INET
 557         case AF_INET:
 558                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 559                         sin = (struct sockaddr_in *)&store;
 560                         sin->sin_family = cp->heartbeat.hb_info.addr_family;
 561                         sin->sin_len = cp->heartbeat.hb_info.addr_len;
 562                         sin->sin_port = stcb->rport;
 563                         memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 564                             sizeof(sin->sin_addr));
 565                 } else {
 566                         return;
 567                 }
 568                 break;
 569 #endif
 570 #ifdef INET6
 571         case AF_INET6:
 572                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 573                         sin6 = (struct sockaddr_in6 *)&store;
 574                         sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 575                         sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 576                         sin6->sin6_port = stcb->rport;
 577                         memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 578                             sizeof(sin6->sin6_addr));
 579                 } else {
 580                         return;
 581                 }
 582                 break;
 583 #endif
 584         default:
 585                 return;
 586         }
 587         r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
 588         if (r_net == NULL) {
 589                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 590                 return;
 591         }
 592         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 593             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 594             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 595                 /*
 596                  * If the its a HB and it's random value is correct when can
 597                  * confirm the destination.
 598                  */
 599                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 600                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 601                         stcb->asoc.primary_destination = r_net;
 602                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 603                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 604                         if (f_net != r_net) {
 605                                 /*
 606                                  * first one on the list is NOT the primary
 607                                  * sctp_cmpaddr() is much more efficent if
 608                                  * the primary is the first on the list,
 609                                  * make it so.
 610                                  */
 611                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 612                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 613                         }
 614                         req_prim = 1;
 615                 }
 616                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 617                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 618                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 619                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 620         }
 621         old_error_counter = r_net->error_count;
 622         r_net->error_count = 0;
 623         r_net->hb_responded = 1;
 624         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 625         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 626         /* Now lets do a RTO with this */
 627         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 628             SCTP_RTT_FROM_NON_DATA);
 629         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 630                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 631                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 632                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
 633         }
 634         if (r_net->dest_state & SCTP_ADDR_PF) {
 635                 r_net->dest_state &= ~SCTP_ADDR_PF;
 636                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 637         }
 638         if (old_error_counter > 0) {
 639                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 640                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 641         }
 642         if (r_net == stcb->asoc.primary_destination) {
 643                 if (stcb->asoc.alternate) {
 644                         /* release the alternate, primary is good */
 645                         sctp_free_remote_addr(stcb->asoc.alternate);
 646                         stcb->asoc.alternate = NULL;
 647                 }
 648         }
 649         /* Mobility adaptation */
 650         if (req_prim) {
 651                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 652                     SCTP_MOBILITY_BASE) ||
 653                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 654                     SCTP_MOBILITY_FASTHANDOFF)) &&
 655                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 656                     SCTP_MOBILITY_PRIM_DELETED)) {
 657
 658                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 659                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 660                             SCTP_MOBILITY_FASTHANDOFF)) {
 661                                 sctp_assoc_immediate_retrans(stcb,
 662                                     stcb->asoc.primary_destination);
 663                         }
 664                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 665                             SCTP_MOBILITY_BASE)) {
 666                                 sctp_move_chunks_from_net(stcb,
 667                                     stcb->asoc.deleted_primary);
 668                         }
 669                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 670                             stcb->asoc.deleted_primary);
 671                 }
 672         }
 673 }
 674
 675 static int
 676 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 677 {
 678         /*
 679          * return 0 means we want you to proceed with the abort non-zero
 680          * means no abort processing
 681          */
 682         struct sctpasochead *head;
 683
 684         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 685                 /* generate a new vtag and send init */
 686                 LIST_REMOVE(stcb, sctp_asocs);
 687                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 688                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 689                 /*
 690                  * put it in the bucket in the vtag hash of assoc's for the
 691                  * system
 692                  */
 693                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 694                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 695                 return (1);
 696         }
 697         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 698                 /*
 699                  * treat like a case where the cookie expired i.e.: - dump
 700                  * current cookie. - generate a new vtag. - resend init.
 701                  */
 702                 /* generate a new vtag and send init */
 703                 LIST_REMOVE(stcb, sctp_asocs);
 704                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 705                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 706                 sctp_stop_all_cookie_timers(stcb);
 707                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 708                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 709                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 710                 /*
 711                  * put it in the bucket in the vtag hash of assoc's for the
 712                  * system
 713                  */
 714                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 715                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 716                 return (1);
 717         }
 718         return (0);
 719 }
 720
 721 static int
 722 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 723     struct sctp_nets *net)
 724 {
 725         /*
 726          * return 0 means we want you to proceed with the abort non-zero
 727          * means no abort processing
 728          */
 729         if (stcb->asoc.peer_supports_auth == 0) {
 730                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 731                 return (0);
 732         }
 733         sctp_asconf_send_nat_state_update(stcb, net);
 734         return (1);
 735 }
 736
 737
 738 static void
 739 sctp_handle_abort(struct sctp_abort_chunk *cp,
 740     struct sctp_tcb *stcb, struct sctp_nets *net)
 741 {
 742 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 743         struct socket *so;
 744
 745 #endif
 746         uint16_t len;
 747
 748         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 749         if (stcb == NULL)
 750                 return;
 751
 752         len = ntohs(cp->ch.chunk_length);
 753         if (len > sizeof(struct sctp_chunkhdr)) {
 754                 /*
 755                  * Need to check the cause codes for our two magic nat
 756                  * aborts which don't kill the assoc necessarily.
 757                  */
 758                 struct sctp_abort_chunk *cpnext;
 759                 struct sctp_missing_nat_state *natc;
 760                 uint16_t cause;
 761
 762                 cpnext = cp;
 763                 cpnext++;
 764                 natc = (struct sctp_missing_nat_state *)cpnext;
 765                 cause = ntohs(natc->cause);
 766                 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 767                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 768                             cp->ch.chunk_flags);
 769                         if (sctp_handle_nat_colliding_state(stcb)) {
 770                                 return;
 771                         }
 772                 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
 773                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 774                             cp->ch.chunk_flags);
 775                         if (sctp_handle_nat_missing_state(stcb, net)) {
 776                                 return;
 777                         }
 778                 }
 779         }
 780         /* stop any receive timers */
 781         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 782         /* notify user of the abort and clean up... */
 783         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 784         /* free the tcb */
 785 #if defined(SCTP_PANIC_ON_ABORT)
 786         printf("stcb:%p state:%d rport:%d net:%p\n",
 787             stcb, stcb->asoc.state, stcb->rport, net);
 788         if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 789                 panic("Received an ABORT");
 790         } else {
 791                 printf("No panic its in state %x closed\n", stcb->asoc.state);
 792         }
 793 #endif
 794         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 795         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 796             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 797                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 798         }
 799 #ifdef SCTP_ASOCLOG_OF_TSNS
 800         sctp_print_out_track_log(stcb);
 801 #endif
 802 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 803         so = SCTP_INP_SO(stcb->sctp_ep);
 804         atomic_add_int(&stcb->asoc.refcnt, 1);
 805         SCTP_TCB_UNLOCK(stcb);
 806         SCTP_SOCKET_LOCK(so, 1);
 807         SCTP_TCB_LOCK(stcb);
 808         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 809 #endif
 810         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 811         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 812             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 813 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 814         SCTP_SOCKET_UNLOCK(so, 1);
 815 #endif
 816         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 817 }
 818
 819 static void
 820 sctp_start_net_timers(struct sctp_tcb *stcb)
 821 {
 822         uint32_t cnt_hb_sent;
 823         struct sctp_nets *net;
 824
 825         cnt_hb_sent = 0;
 826         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 827                 /*
 828                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 829                  * If the dest in unconfirmed send a hb as well if under
 830                  * max_hb_burst have been sent.
 831                  */
 832                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 833                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 834                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 835                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 836                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 837                         cnt_hb_sent++;
 838                 }
 839         }
 840         if (cnt_hb_sent) {
 841                 sctp_chunk_output(stcb->sctp_ep, stcb,
 842                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 843                     SCTP_SO_NOT_LOCKED);
 844         }
 845 }
 846
 847
 848 static void
 849 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 850     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 851 {
 852         struct sctp_association *asoc;
 853         int some_on_streamwheel;
 854
 855 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 856         struct socket *so;
 857
 858 #endif
 859
 860         SCTPDBG(SCTP_DEBUG_INPUT2,
 861             "sctp_handle_shutdown: handling SHUTDOWN\n");
 862         if (stcb == NULL)
 863                 return;
 864         asoc = &stcb->asoc;
 865         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 866             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 867                 return;
 868         }
 869         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 870                 /* Shutdown NOT the expected size */
 871                 return;
 872         } else {
 873                 sctp_update_acked(stcb, cp, abort_flag);
 874                 if (*abort_flag) {
 875                         return;
 876                 }
 877         }
 878         if (asoc->control_pdapi) {
 879                 /*
 880                  * With a normal shutdown we assume the end of last record.
 881                  */
 882                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 883                 asoc->control_pdapi->end_added = 1;
 884                 asoc->control_pdapi->pdapi_aborted = 1;
 885                 asoc->control_pdapi = NULL;
 886                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 887 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 888                 so = SCTP_INP_SO(stcb->sctp_ep);
 889                 atomic_add_int(&stcb->asoc.refcnt, 1);
 890                 SCTP_TCB_UNLOCK(stcb);
 891                 SCTP_SOCKET_LOCK(so, 1);
 892                 SCTP_TCB_LOCK(stcb);
 893                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 894                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 895                         /* assoc was freed while we were unlocked */
 896                         SCTP_SOCKET_UNLOCK(so, 1);
 897                         return;
 898                 }
 899 #endif
 900                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 901 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 902                 SCTP_SOCKET_UNLOCK(so, 1);
 903 #endif
 904         }
 905         /* goto SHUTDOWN_RECEIVED state to block new requests */
 906         if (stcb->sctp_socket) {
 907                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 908                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 909                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 910                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 911                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 912                         /*
 913                          * notify upper layer that peer has initiated a
 914                          * shutdown
 915                          */
 916                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 917
 918                         /* reset time */
 919                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 920                 }
 921         }
 922         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 923                 /*
 924                  * stop the shutdown timer, since we WILL move to
 925                  * SHUTDOWN-ACK-SENT.
 926                  */
 927                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 928         }
 929         /* Now is there unsent data on a stream somewhere? */
 930         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 931
 932         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 933             !TAILQ_EMPTY(&asoc->sent_queue) ||
 934             some_on_streamwheel) {
 935                 /* By returning we will push more data out */
 936                 return;
 937         } else {
 938                 /* no outstanding data to send, so move on... */
 939                 /* send SHUTDOWN-ACK */
 940                 sctp_send_shutdown_ack(stcb, net);
 941                 /* move to SHUTDOWN-ACK-SENT state */
 942                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 943                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 944                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 945                 }
 946                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 947                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 948                 sctp_stop_timers_for_shutdown(stcb);
 949                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 950                     stcb, net);
 951         }
 952 }
 953
 954 static void
 955 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 956     struct sctp_tcb *stcb,
 957     struct sctp_nets *net)
 958 {
 959         struct sctp_association *asoc;
 960
 961 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 962         struct socket *so;
 963
 964         so = SCTP_INP_SO(stcb->sctp_ep);
 965 #endif
 966         SCTPDBG(SCTP_DEBUG_INPUT2,
 967             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 968         if (stcb == NULL)
 969                 return;
 970
 971         asoc = &stcb->asoc;
 972         /* process according to association state */
 973         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 974             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 975                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 976                 sctp_send_shutdown_complete(stcb, net, 1);
 977                 SCTP_TCB_UNLOCK(stcb);
 978                 return;
 979         }
 980         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 981             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 982                 /* unexpected SHUTDOWN-ACK... so ignore... */
 983                 SCTP_TCB_UNLOCK(stcb);
 984                 return;
 985         }
 986         if (asoc->control_pdapi) {
 987                 /*
 988                  * With a normal shutdown we assume the end of last record.
 989                  */
 990                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 991                 asoc->control_pdapi->end_added = 1;
 992                 asoc->control_pdapi->pdapi_aborted = 1;
 993                 asoc->control_pdapi = NULL;
 994                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 995 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 996                 atomic_add_int(&stcb->asoc.refcnt, 1);
 997                 SCTP_TCB_UNLOCK(stcb);
 998                 SCTP_SOCKET_LOCK(so, 1);
 999                 SCTP_TCB_LOCK(stcb);
1000                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1001                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1002                         /* assoc was freed while we were unlocked */
1003                         SCTP_SOCKET_UNLOCK(so, 1);
1004                         return;
1005                 }
1006 #endif
1007                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1008 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1009                 SCTP_SOCKET_UNLOCK(so, 1);
1010 #endif
1011         }
1012         /* are the queues empty? */
1013         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1014             !TAILQ_EMPTY(&asoc->sent_queue) ||
1015             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1016                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
1017         }
1018         /* stop the timer */
1019         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1020         /* send SHUTDOWN-COMPLETE */
1021         sctp_send_shutdown_complete(stcb, net, 0);
1022         /* notify upper layer protocol */
1023         if (stcb->sctp_socket) {
1024                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1025                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1026                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1027                         /* Set the connected flag to disconnected */
1028                         stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
1029                 }
1030         }
1031         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1032         /* free the TCB but first save off the ep */
1033 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1034         atomic_add_int(&stcb->asoc.refcnt, 1);
1035         SCTP_TCB_UNLOCK(stcb);
1036         SCTP_SOCKET_LOCK(so, 1);
1037         SCTP_TCB_LOCK(stcb);
1038         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1039 #endif
1040         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1041             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1042 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1043         SCTP_SOCKET_UNLOCK(so, 1);
1044 #endif
1045 }
1046
1047 /*
1048  * Skip past the param header and then we will find the chunk that caused the
1049  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1050  * our peer must be broken.
1051  */
1052 static void
1053 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1054     struct sctp_nets *net)
1055 {
1056         struct sctp_chunkhdr *chk;
1057
1058         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1059         switch (chk->chunk_type) {
1060         case SCTP_ASCONF_ACK:
1061         case SCTP_ASCONF:
1062                 sctp_asconf_cleanup(stcb, net);
1063                 break;
1064         case SCTP_FORWARD_CUM_TSN:
1065                 stcb->asoc.peer_supports_prsctp = 0;
1066                 break;
1067         default:
1068                 SCTPDBG(SCTP_DEBUG_INPUT2,
1069                     "Peer does not support chunk type %d(%x)??\n",
1070                     chk->chunk_type, (uint32_t) chk->chunk_type);
1071                 break;
1072         }
1073 }
1074
1075 /*
1076  * Skip past the param header and then we will find the param that caused the
1077  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1078  * these will turn of specific features.
1079  */
1080 static void
1081 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1082 {
1083         struct sctp_paramhdr *pbad;
1084
1085         pbad = phdr + 1;
1086         switch (ntohs(pbad->param_type)) {
1087                 /* pr-sctp draft */
1088         case SCTP_PRSCTP_SUPPORTED:
1089                 stcb->asoc.peer_supports_prsctp = 0;
1090                 break;
1091         case SCTP_SUPPORTED_CHUNK_EXT:
1092                 break;
1093                 /* draft-ietf-tsvwg-addip-sctp */
1094         case SCTP_HAS_NAT_SUPPORT:
1095                 stcb->asoc.peer_supports_nat = 0;
1096                 break;
1097         case SCTP_ADD_IP_ADDRESS:
1098         case SCTP_DEL_IP_ADDRESS:
1099         case SCTP_SET_PRIM_ADDR:
1100                 stcb->asoc.peer_supports_asconf = 0;
1101                 break;
1102         case SCTP_SUCCESS_REPORT:
1103         case SCTP_ERROR_CAUSE_IND:
1104                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1105                 SCTPDBG(SCTP_DEBUG_INPUT2,
1106                     "Turning off ASCONF to this strange peer\n");
1107                 stcb->asoc.peer_supports_asconf = 0;
1108                 break;
1109         default:
1110                 SCTPDBG(SCTP_DEBUG_INPUT2,
1111                     "Peer does not support param type %d(%x)??\n",
1112                     pbad->param_type, (uint32_t) pbad->param_type);
1113                 break;
1114         }
1115 }
1116
1117 static int
1118 sctp_handle_error(struct sctp_chunkhdr *ch,
1119     struct sctp_tcb *stcb, struct sctp_nets *net)
1120 {
1121         int chklen;
1122         struct sctp_paramhdr *phdr;
1123         uint16_t error_type;
1124         uint16_t error_len;
1125         struct sctp_association *asoc;
1126         int adjust;
1127
1128 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1129         struct socket *so;
1130
1131 #endif
1132
1133         /* parse through all of the errors and process */
1134         asoc = &stcb->asoc;
1135         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1136             sizeof(struct sctp_chunkhdr));
1137         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1138         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1139                 /* Process an Error Cause */
1140                 error_type = ntohs(phdr->param_type);
1141                 error_len = ntohs(phdr->param_length);
1142                 if ((error_len > chklen) || (error_len == 0)) {
1143                         /* invalid param length for this param */
1144                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1145                             chklen, error_len);
1146                         return (0);
1147                 }
1148                 switch (error_type) {
1149                 case SCTP_CAUSE_INVALID_STREAM:
1150                 case SCTP_CAUSE_MISSING_PARAM:
1151                 case SCTP_CAUSE_INVALID_PARAM:
1152                 case SCTP_CAUSE_NO_USER_DATA:
1153                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1154                             error_type);
1155                         break;
1156                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1157                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1158                             ch->chunk_flags);
1159                         if (sctp_handle_nat_colliding_state(stcb)) {
1160                                 return (0);
1161                         }
1162                         break;
1163                 case SCTP_CAUSE_NAT_MISSING_STATE:
1164                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1165                             ch->chunk_flags);
1166                         if (sctp_handle_nat_missing_state(stcb, net)) {
1167                                 return (0);
1168                         }
1169                         break;
1170                 case SCTP_CAUSE_STALE_COOKIE:
1171                         /*
1172                          * We only act if we have echoed a cookie and are
1173                          * waiting.
1174                          */
1175                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1176                                 int *p;
1177
1178                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1179                                 /* Save the time doubled */
1180                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1181                                 asoc->stale_cookie_count++;
1182                                 if (asoc->stale_cookie_count >
1183                                     asoc->max_init_times) {
1184                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1185                                         /* now free the asoc */
1186 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1187                                         so = SCTP_INP_SO(stcb->sctp_ep);
1188                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1189                                         SCTP_TCB_UNLOCK(stcb);
1190                                         SCTP_SOCKET_LOCK(so, 1);
1191                                         SCTP_TCB_LOCK(stcb);
1192                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1193 #endif
1194                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1195                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1196 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1197                                         SCTP_SOCKET_UNLOCK(so, 1);
1198 #endif
1199                                         return (-1);
1200                                 }
1201                                 /* blast back to INIT state */
1202                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1203                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1204                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1205                                 sctp_stop_all_cookie_timers(stcb);
1206                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1207                         }
1208                         break;
1209                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1210                         /*
1211                          * Nothing we can do here, we don't do hostname
1212                          * addresses so if the peer does not like my IPv6
1213                          * (or IPv4 for that matter) it does not matter. If
1214                          * they don't support that type of address, they can
1215                          * NOT possibly get that packet type... i.e. with no
1216                          * IPv6 you can't recieve a IPv6 packet. so we can
1217                          * safely ignore this one. If we ever added support
1218                          * for HOSTNAME Addresses, then we would need to do
1219                          * something here.
1220                          */
1221                         break;
1222                 case SCTP_CAUSE_UNRECOG_CHUNK:
1223                         sctp_process_unrecog_chunk(stcb, phdr, net);
1224                         break;
1225                 case SCTP_CAUSE_UNRECOG_PARAM:
1226                         sctp_process_unrecog_param(stcb, phdr);
1227                         break;
1228                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1229                         /*
1230                          * We ignore this since the timer will drive out a
1231                          * new cookie anyway and there timer will drive us
1232                          * to send a SHUTDOWN_COMPLETE. We can't send one
1233                          * here since we don't have their tag.
1234                          */
1235                         break;
1236                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1237                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1238                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1239                         /*
1240                          * We should NOT get these here, but in a
1241                          * ASCONF-ACK.
1242                          */
1243                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1244                             error_type);
1245                         break;
1246                 case SCTP_CAUSE_OUT_OF_RESC:
1247                         /*
1248                          * And what, pray tell do we do with the fact that
1249                          * the peer is out of resources? Not really sure we
1250                          * could do anything but abort. I suspect this
1251                          * should have came WITH an abort instead of in a
1252                          * OP-ERROR.
1253                          */
1254                         break;
1255                 default:
1256                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1257                             error_type);
1258                         break;
1259                 }
1260                 adjust = SCTP_SIZE32(error_len);
1261                 chklen -= adjust;
1262                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1263         }
1264         return (0);
1265 }
1266
1267 static int
1268 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1269     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1270     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1271 {
1272         struct sctp_init_ack *init_ack;
1273         struct mbuf *op_err;
1274
1275         SCTPDBG(SCTP_DEBUG_INPUT2,
1276             "sctp_handle_init_ack: handling INIT-ACK\n");
1277
1278         if (stcb == NULL) {
1279                 SCTPDBG(SCTP_DEBUG_INPUT2,
1280                     "sctp_handle_init_ack: TCB is null\n");
1281                 return (-1);
1282         }
1283         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1284                 /* Invalid length */
1285                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1286                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1287                     op_err, 0, net->port);
1288                 *abort_no_unlock = 1;
1289                 return (-1);
1290         }
1291         init_ack = &cp->init;
1292         /* validate parameters */
1293         if (init_ack->initiate_tag == 0) {
1294                 /* protocol error... send an abort */
1295                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1296                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1297                     op_err, 0, net->port);
1298                 *abort_no_unlock = 1;
1299                 return (-1);
1300         }
1301         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1302                 /* protocol error... send an abort */
1303                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1304                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1305                     op_err, 0, net->port);
1306                 *abort_no_unlock = 1;
1307                 return (-1);
1308         }
1309         if (init_ack->num_inbound_streams == 0) {
1310                 /* protocol error... send an abort */
1311                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1312                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1313                     op_err, 0, net->port);
1314                 *abort_no_unlock = 1;
1315                 return (-1);
1316         }
1317         if (init_ack->num_outbound_streams == 0) {
1318                 /* protocol error... send an abort */
1319                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1320                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1321                     op_err, 0, net->port);
1322                 *abort_no_unlock = 1;
1323                 return (-1);
1324         }
1325         /* process according to association state... */
1326         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1327         case SCTP_STATE_COOKIE_WAIT:
1328                 /* this is the expected state for this chunk */
1329                 /* process the INIT-ACK parameters */
1330                 if (stcb->asoc.primary_destination->dest_state &
1331                     SCTP_ADDR_UNCONFIRMED) {
1332                         /*
1333                          * The primary is where we sent the INIT, we can
1334                          * always consider it confirmed when the INIT-ACK is
1335                          * returned. Do this before we load addresses
1336                          * though.
1337                          */
1338                         stcb->asoc.primary_destination->dest_state &=
1339                             ~SCTP_ADDR_UNCONFIRMED;
1340                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1341                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1342                 }
1343                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1344                     net, abort_no_unlock, vrf_id) < 0) {
1345                         /* error in parsing parameters */
1346                         return (-1);
1347                 }
1348                 /* update our state */
1349                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1350                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1351
1352                 /* reset the RTO calc */
1353                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1354                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1355                             stcb->asoc.overall_error_count,
1356                             0,
1357                             SCTP_FROM_SCTP_INPUT,
1358                             __LINE__);
1359                 }
1360                 stcb->asoc.overall_error_count = 0;
1361                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1362                 /*
1363                  * collapse the init timer back in case of a exponential
1364                  * backoff
1365                  */
1366                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1367                     stcb, net);
1368                 /*
1369                  * the send at the end of the inbound data processing will
1370                  * cause the cookie to be sent
1371                  */
1372                 break;
1373         case SCTP_STATE_SHUTDOWN_SENT:
1374                 /* incorrect state... discard */
1375                 break;
1376         case SCTP_STATE_COOKIE_ECHOED:
1377                 /* incorrect state... discard */
1378                 break;
1379         case SCTP_STATE_OPEN:
1380                 /* incorrect state... discard */
1381                 break;
1382         case SCTP_STATE_EMPTY:
1383         case SCTP_STATE_INUSE:
1384         default:
1385                 /* incorrect state... discard */
1386                 return (-1);
1387                 break;
1388         }
1389         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1390         return (0);
1391 }
1392
1393 static struct sctp_tcb *
1394 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1395     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1396     struct sctp_inpcb *inp, struct sctp_nets **netp,
1397     struct sockaddr *init_src, int *notification,
1398     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1399     uint32_t vrf_id, uint16_t port);
1400
1401
1402 /*
1403  * handle a state cookie for an existing association m: input packet mbuf
1404  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1405  * "split" mbuf and the cookie signature does not exist offset: offset into
1406  * mbuf to the cookie-echo chunk
1407  */
1408 static struct sctp_tcb *
1409 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1410     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1411     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1412     struct sockaddr *init_src, int *notification,
1413     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1414 {
1415         struct sctp_association *asoc;
1416         struct sctp_init_chunk *init_cp, init_buf;
1417         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1418         struct sctp_nets *net;
1419         struct mbuf *op_err;
1420         struct sctp_paramhdr *ph;
1421         int init_offset, initack_offset, i;
1422         int retval;
1423         int spec_flag = 0;
1424         uint32_t how_indx;
1425
1426         net = *netp;
1427         /* I know that the TCB is non-NULL from the caller */
1428         asoc = &stcb->asoc;
1429         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1430                 if (asoc->cookie_how[how_indx] == 0)
1431                         break;
1432         }
1433         if (how_indx < sizeof(asoc->cookie_how)) {
1434                 asoc->cookie_how[how_indx] = 1;
1435         }
1436         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1437                 /* SHUTDOWN came in after sending INIT-ACK */
1438                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1439                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1440                     0, M_DONTWAIT, 1, MT_DATA);
1441                 if (op_err == NULL) {
1442                         /* FOOBAR */
1443                         return (NULL);
1444                 }
1445                 /* Set the len */
1446                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1447                 ph = mtod(op_err, struct sctp_paramhdr *);
1448                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1449                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1450                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1451                     vrf_id, net->port);
1452                 if (how_indx < sizeof(asoc->cookie_how))
1453                         asoc->cookie_how[how_indx] = 2;
1454                 return (NULL);
1455         }
1456         /*
1457          * find and validate the INIT chunk in the cookie (peer's info) the
1458          * INIT should start after the cookie-echo header struct (chunk
1459          * header, state cookie header struct)
1460          */
1461         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1462
1463         init_cp = (struct sctp_init_chunk *)
1464             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1465             (uint8_t *) & init_buf);
1466         if (init_cp == NULL) {
1467                 /* could not pull a INIT chunk in cookie */
1468                 return (NULL);
1469         }
1470         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1471                 return (NULL);
1472         }
1473         /*
1474          * find and validate the INIT-ACK chunk in the cookie (my info) the
1475          * INIT-ACK follows the INIT chunk
1476          */
1477         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1478         initack_cp = (struct sctp_init_ack_chunk *)
1479             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1480             (uint8_t *) & initack_buf);
1481         if (initack_cp == NULL) {
1482                 /* could not pull INIT-ACK chunk in cookie */
1483                 return (NULL);
1484         }
1485         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1486                 return (NULL);
1487         }
1488         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1489             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1490                 /*
1491                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1492                  * to get into the OPEN state
1493                  */
1494                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1495                         /*-
1496                          * Opps, this means that we somehow generated two vtag's
1497                          * the same. I.e. we did:
1498                          *  Us               Peer
1499                          *   <---INIT(tag=a)------
1500                          *   ----INIT-ACK(tag=t)-->
1501                          *   ----INIT(tag=t)------> *1
1502                          *   <---INIT-ACK(tag=a)---
1503                          *   <----CE(tag=t)------------- *2
1504                          *
1505                          * At point *1 we should be generating a different
1506                          * tag t'. Which means we would throw away the CE and send
1507                          * ours instead. Basically this is case C (throw away side).
1508                          */
1509                         if (how_indx < sizeof(asoc->cookie_how))
1510                                 asoc->cookie_how[how_indx] = 17;
1511                         return (NULL);
1512
1513                 }
1514                 switch SCTP_GET_STATE
1515                         (asoc) {
1516                 case SCTP_STATE_COOKIE_WAIT:
1517                 case SCTP_STATE_COOKIE_ECHOED:
1518                         /*
1519                          * INIT was sent but got a COOKIE_ECHO with the
1520                          * correct tags... just accept it...but we must
1521                          * process the init so that we can make sure we have
1522                          * the right seq no's.
1523                          */
1524                         /* First we must process the INIT !! */
1525                         retval = sctp_process_init(init_cp, stcb);
1526                         if (retval < 0) {
1527                                 if (how_indx < sizeof(asoc->cookie_how))
1528                                         asoc->cookie_how[how_indx] = 3;
1529                                 return (NULL);
1530                         }
1531                         /* we have already processed the INIT so no problem */
1532                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1533                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1534                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1535                         /* update current state */
1536                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1537                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1538                         else
1539                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1540
1541                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1542                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1543                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1544                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1545                         }
1546                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1547                         sctp_stop_all_cookie_timers(stcb);
1548                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1549                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1550                             (inp->sctp_socket->so_qlimit == 0)
1551                             ) {
1552 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1553                                 struct socket *so;
1554
1555 #endif
1556                                 /*
1557                                  * Here is where collision would go if we
1558                                  * did a connect() and instead got a
1559                                  * init/init-ack/cookie done before the
1560                                  * init-ack came back..
1561                                  */
1562                                 stcb->sctp_ep->sctp_flags |=
1563                                     SCTP_PCB_FLAGS_CONNECTED;
1564 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1565                                 so = SCTP_INP_SO(stcb->sctp_ep);
1566                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1567                                 SCTP_TCB_UNLOCK(stcb);
1568                                 SCTP_SOCKET_LOCK(so, 1);
1569                                 SCTP_TCB_LOCK(stcb);
1570                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1571                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1572                                         SCTP_SOCKET_UNLOCK(so, 1);
1573                                         return (NULL);
1574                                 }
1575 #endif
1576                                 soisconnected(stcb->sctp_socket);
1577 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1578                                 SCTP_SOCKET_UNLOCK(so, 1);
1579 #endif
1580                         }
1581                         /* notify upper layer */
1582                         *notification = SCTP_NOTIFY_ASSOC_UP;
1583                         /*
1584                          * since we did not send a HB make sure we don't
1585                          * double things
1586                          */
1587                         net->hb_responded = 1;
1588                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1589                             &cookie->time_entered,
1590                             sctp_align_unsafe_makecopy,
1591                             SCTP_RTT_FROM_NON_DATA);
1592
1593                         if (stcb->asoc.sctp_autoclose_ticks &&
1594                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1595                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1596                                     inp, stcb, NULL);
1597                         }
1598                         break;
1599                 default:
1600                         /*
1601                          * we're in the OPEN state (or beyond), so peer must
1602                          * have simply lost the COOKIE-ACK
1603                          */
1604                         break;
1605                         }       /* end switch */
1606                 sctp_stop_all_cookie_timers(stcb);
1607                 /*
1608                  * We ignore the return code here.. not sure if we should
1609                  * somehow abort.. but we do have an existing asoc. This
1610                  * really should not fail.
1611                  */
1612                 if (sctp_load_addresses_from_init(stcb, m,
1613                     init_offset + sizeof(struct sctp_init_chunk),
1614                     initack_offset, sh, init_src)) {
1615                         if (how_indx < sizeof(asoc->cookie_how))
1616                                 asoc->cookie_how[how_indx] = 4;
1617                         return (NULL);
1618                 }
1619                 /* respond with a COOKIE-ACK */
1620                 sctp_toss_old_cookies(stcb, asoc);
1621                 sctp_send_cookie_ack(stcb);
1622                 if (how_indx < sizeof(asoc->cookie_how))
1623                         asoc->cookie_how[how_indx] = 5;
1624                 return (stcb);
1625         }
1626         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1627             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1628             cookie->tie_tag_my_vtag == 0 &&
1629             cookie->tie_tag_peer_vtag == 0) {
1630                 /*
1631                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1632                  */
1633                 if (how_indx < sizeof(asoc->cookie_how))
1634                         asoc->cookie_how[how_indx] = 6;
1635                 return (NULL);
1636         }
1637         /*
1638          * If nat support, and the below and stcb is established, send back
1639          * a ABORT(colliding state) if we are established.
1640          */
1641         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1642             (asoc->peer_supports_nat) &&
1643             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1644             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1645             (asoc->peer_vtag == 0)))) {
1646                 /*
1647                  * Special case - Peer's support nat. We may have two init's
1648                  * that we gave out the same tag on since one was not
1649                  * established.. i.e. we get INIT from host-1 behind the nat
1650                  * and we respond tag-a, we get a INIT from host-2 behind
1651                  * the nat and we get tag-a again. Then we bring up host-1
1652                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1653                  * Now we have colliding state. We must send an abort here
1654                  * with colliding state indication.
1655                  */
1656                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1657                     0, M_DONTWAIT, 1, MT_DATA);
1658                 if (op_err == NULL) {
1659                         /* FOOBAR */
1660                         return (NULL);
1661                 }
1662                 /* pre-reserve some space */
1663 #ifdef INET6
1664                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1665 #else
1666                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1667 #endif
1668                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1669                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1670                 /* Set the len */
1671                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1672                 ph = mtod(op_err, struct sctp_paramhdr *);
1673                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1674                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1675                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1676                 return (NULL);
1677         }
1678         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1679             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1680             (asoc->peer_vtag == 0))) {
1681                 /*
1682                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1683                  * should be ok, re-accept peer info
1684                  */
1685                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1686                         /*
1687                          * Extension of case C. If we hit this, then the
1688                          * random number generator returned the same vtag
1689                          * when we first sent our INIT-ACK and when we later
1690                          * sent our INIT. The side with the seq numbers that
1691                          * are different will be the one that normnally
1692                          * would have hit case C. This in effect "extends"
1693                          * our vtags in this collision case to be 64 bits.
1694                          * The same collision could occur aka you get both
1695                          * vtag and seq number the same twice in a row.. but
1696                          * is much less likely. If it did happen then we
1697                          * would proceed through and bring up the assoc.. we
1698                          * may end up with the wrong stream setup however..
1699                          * which would be bad.. but there is no way to
1700                          * tell.. until we send on a stream that does not
1701                          * exist :-)
1702                          */
1703                         if (how_indx < sizeof(asoc->cookie_how))
1704                                 asoc->cookie_how[how_indx] = 7;
1705
1706                         return (NULL);
1707                 }
1708                 if (how_indx < sizeof(asoc->cookie_how))
1709                         asoc->cookie_how[how_indx] = 8;
1710                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1711                 sctp_stop_all_cookie_timers(stcb);
1712                 /*
1713                  * since we did not send a HB make sure we don't double
1714                  * things
1715                  */
1716                 net->hb_responded = 1;
1717                 if (stcb->asoc.sctp_autoclose_ticks &&
1718                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1719                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1720                             NULL);
1721                 }
1722                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1723                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1724
1725                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1726                         /*
1727                          * Ok the peer probably discarded our data (if we
1728                          * echoed a cookie+data). So anything on the
1729                          * sent_queue should be marked for retransmit, we
1730                          * may not get something to kick us so it COULD
1731                          * still take a timeout to move these.. but it can't
1732                          * hurt to mark them.
1733                          */
1734                         struct sctp_tmit_chunk *chk;
1735
1736                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1737                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1738                                         chk->sent = SCTP_DATAGRAM_RESEND;
1739                                         sctp_flight_size_decrease(chk);
1740                                         sctp_total_flight_decrease(stcb, chk);
1741                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1742                                         spec_flag++;
1743                                 }
1744                         }
1745
1746                 }
1747                 /* process the INIT info (peer's info) */
1748                 retval = sctp_process_init(init_cp, stcb);
1749                 if (retval < 0) {
1750                         if (how_indx < sizeof(asoc->cookie_how))
1751                                 asoc->cookie_how[how_indx] = 9;
1752                         return (NULL);
1753                 }
1754                 if (sctp_load_addresses_from_init(stcb, m,
1755                     init_offset + sizeof(struct sctp_init_chunk),
1756                     initack_offset, sh, init_src)) {
1757                         if (how_indx < sizeof(asoc->cookie_how))
1758                                 asoc->cookie_how[how_indx] = 10;
1759                         return (NULL);
1760                 }
1761                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1762                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1763                         *notification = SCTP_NOTIFY_ASSOC_UP;
1764
1765                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1766                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1767                             (inp->sctp_socket->so_qlimit == 0)) {
1768 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1769                                 struct socket *so;
1770
1771 #endif
1772                                 stcb->sctp_ep->sctp_flags |=
1773                                     SCTP_PCB_FLAGS_CONNECTED;
1774 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1775                                 so = SCTP_INP_SO(stcb->sctp_ep);
1776                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1777                                 SCTP_TCB_UNLOCK(stcb);
1778                                 SCTP_SOCKET_LOCK(so, 1);
1779                                 SCTP_TCB_LOCK(stcb);
1780                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1781                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1782                                         SCTP_SOCKET_UNLOCK(so, 1);
1783                                         return (NULL);
1784                                 }
1785 #endif
1786                                 soisconnected(stcb->sctp_socket);
1787 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1788                                 SCTP_SOCKET_UNLOCK(so, 1);
1789 #endif
1790                         }
1791                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1792                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1793                         else
1794                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1795                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1796                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1797                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1798                 } else {
1799                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1800                 }
1801                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1802                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1803                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1804                             stcb->sctp_ep, stcb, asoc->primary_destination);
1805                 }
1806                 sctp_stop_all_cookie_timers(stcb);
1807                 sctp_toss_old_cookies(stcb, asoc);
1808                 sctp_send_cookie_ack(stcb);
1809                 if (spec_flag) {
1810                         /*
1811                          * only if we have retrans set do we do this. What
1812                          * this call does is get only the COOKIE-ACK out and
1813                          * then when we return the normal call to
1814                          * sctp_chunk_output will get the retrans out behind
1815                          * this.
1816                          */
1817                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1818                 }
1819                 if (how_indx < sizeof(asoc->cookie_how))
1820                         asoc->cookie_how[how_indx] = 11;
1821
1822                 return (stcb);
1823         }
1824         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1825             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1826             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1827             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1828             cookie->tie_tag_peer_vtag != 0) {
1829                 struct sctpasochead *head;
1830
1831                 if (asoc->peer_supports_nat) {
1832                         /*
1833                          * This is a gross gross hack. just call the
1834                          * cookie_new code since we are allowing a duplicate
1835                          * association. I hope this works...
1836                          */
1837                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1838                             inp, netp, init_src, notification,
1839                             auth_skipped, auth_offset, auth_len,
1840                             vrf_id, port));
1841                 }
1842                 /*
1843                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1844                  */
1845                 /* temp code */
1846                 if (how_indx < sizeof(asoc->cookie_how))
1847                         asoc->cookie_how[how_indx] = 12;
1848                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1849                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1850
1851                 /* notify upper layer */
1852                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1853                 atomic_add_int(&stcb->asoc.refcnt, 1);
1854                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1855                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1856                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1857                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1858                 }
1859                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1860                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1861                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1862                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1863                 }
1864                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1865                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1866                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1867                             stcb->sctp_ep, stcb, asoc->primary_destination);
1868
1869                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1870                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1871                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1872                 }
1873                 asoc->pre_open_streams =
1874                     ntohs(initack_cp->init.num_outbound_streams);
1875                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1876                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1877                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1878
1879                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1880
1881                 asoc->str_reset_seq_in = asoc->init_seq_number;
1882
1883                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1884                 if (asoc->mapping_array) {
1885                         memset(asoc->mapping_array, 0,
1886                             asoc->mapping_array_size);
1887                 }
1888                 if (asoc->nr_mapping_array) {
1889                         memset(asoc->nr_mapping_array, 0,
1890                             asoc->mapping_array_size);
1891                 }
1892                 SCTP_TCB_UNLOCK(stcb);
1893                 SCTP_INP_INFO_WLOCK();
1894                 SCTP_INP_WLOCK(stcb->sctp_ep);
1895                 SCTP_TCB_LOCK(stcb);
1896                 atomic_add_int(&stcb->asoc.refcnt, -1);
1897                 /* send up all the data */
1898                 SCTP_TCB_SEND_LOCK(stcb);
1899
1900                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1901                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1902                         stcb->asoc.strmout[i].stream_no = i;
1903                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1904                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1905                 }
1906                 /* process the INIT-ACK info (my info) */
1907                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1908                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1909
1910                 /* pull from vtag hash */
1911                 LIST_REMOVE(stcb, sctp_asocs);
1912                 /* re-insert to new vtag position */
1913                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1914                     SCTP_BASE_INFO(hashasocmark))];
1915                 /*
1916                  * put it in the bucket in the vtag hash of assoc's for the
1917                  * system
1918                  */
1919                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1920
1921                 /* process the INIT info (peer's info) */
1922                 SCTP_TCB_SEND_UNLOCK(stcb);
1923                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1924                 SCTP_INP_INFO_WUNLOCK();
1925
1926                 retval = sctp_process_init(init_cp, stcb);
1927                 if (retval < 0) {
1928                         if (how_indx < sizeof(asoc->cookie_how))
1929                                 asoc->cookie_how[how_indx] = 13;
1930
1931                         return (NULL);
1932                 }
1933                 /*
1934                  * since we did not send a HB make sure we don't double
1935                  * things
1936                  */
1937                 net->hb_responded = 1;
1938
1939                 if (sctp_load_addresses_from_init(stcb, m,
1940                     init_offset + sizeof(struct sctp_init_chunk),
1941                     initack_offset, sh, init_src)) {
1942                         if (how_indx < sizeof(asoc->cookie_how))
1943                                 asoc->cookie_how[how_indx] = 14;
1944
1945                         return (NULL);
1946                 }
1947                 /* respond with a COOKIE-ACK */
1948                 sctp_stop_all_cookie_timers(stcb);
1949                 sctp_toss_old_cookies(stcb, asoc);
1950                 sctp_send_cookie_ack(stcb);
1951                 if (how_indx < sizeof(asoc->cookie_how))
1952                         asoc->cookie_how[how_indx] = 15;
1953
1954                 return (stcb);
1955         }
1956         if (how_indx < sizeof(asoc->cookie_how))
1957                 asoc->cookie_how[how_indx] = 16;
1958         /* all other cases... */
1959         return (NULL);
1960 }
1961
1962
1963 /*
1964  * handle a state cookie for a new association m: input packet mbuf chain--
1965  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1966  * and the cookie signature does not exist offset: offset into mbuf to the
1967  * cookie-echo chunk length: length of the cookie chunk to: where the init
1968  * was from returns a new TCB
1969  */
1970 struct sctp_tcb *
1971 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1972     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1973     struct sctp_inpcb *inp, struct sctp_nets **netp,
1974     struct sockaddr *init_src, int *notification,
1975     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1976     uint32_t vrf_id, uint16_t port)
1977 {
1978         struct sctp_tcb *stcb;
1979         struct sctp_init_chunk *init_cp, init_buf;
1980         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1981         struct sockaddr_storage sa_store;
1982         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1983         struct sctp_association *asoc;
1984         int init_offset, initack_offset, initack_limit;
1985         int retval;
1986         int error = 0;
1987         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1988
1989 #ifdef INET
1990         struct sockaddr_in *sin;
1991
1992 #endif
1993 #ifdef INET6
1994         struct sockaddr_in6 *sin6;
1995
1996 #endif
1997 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1998         struct socket *so;
1999
2000         so = SCTP_INP_SO(inp);
2001 #endif
2002
2003         /*
2004          * find and validate the INIT chunk in the cookie (peer's info) the
2005          * INIT should start after the cookie-echo header struct (chunk
2006          * header, state cookie header struct)
2007          */
2008         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2009         init_cp = (struct sctp_init_chunk *)
2010             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2011             (uint8_t *) & init_buf);
2012         if (init_cp == NULL) {
2013                 /* could not pull a INIT chunk in cookie */
2014                 SCTPDBG(SCTP_DEBUG_INPUT1,
2015                     "process_cookie_new: could not pull INIT chunk hdr\n");
2016                 return (NULL);
2017         }
2018         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2019                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2020                 return (NULL);
2021         }
2022         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2023         /*
2024          * find and validate the INIT-ACK chunk in the cookie (my info) the
2025          * INIT-ACK follows the INIT chunk
2026          */
2027         initack_cp = (struct sctp_init_ack_chunk *)
2028             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2029             (uint8_t *) & initack_buf);
2030         if (initack_cp == NULL) {
2031                 /* could not pull INIT-ACK chunk in cookie */
2032                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2033                 return (NULL);
2034         }
2035         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2036                 return (NULL);
2037         }
2038         /*
2039          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2040          * "initack_limit" value.  This is because the chk_length field
2041          * includes the length of the cookie, but the cookie is omitted when
2042          * the INIT and INIT_ACK are tacked onto the cookie...
2043          */
2044         initack_limit = offset + cookie_len;
2045
2046         /*
2047          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2048          * and popluate
2049          */
2050
2051         /*
2052          * Here we do a trick, we set in NULL for the proc/thread argument.
2053          * We do this since in effect we only use the p argument when the
2054          * socket is unbound and we must do an implicit bind. Since we are
2055          * getting a cookie, we cannot be unbound.
2056          */
2057         stcb = sctp_aloc_assoc(inp, init_src, &error,
2058             ntohl(initack_cp->init.initiate_tag), vrf_id,
2059             (struct thread *)NULL
2060             );
2061         if (stcb == NULL) {
2062                 struct mbuf *op_err;
2063
2064                 /* memory problem? */
2065                 SCTPDBG(SCTP_DEBUG_INPUT1,
2066                     "process_cookie_new: no room for another TCB!\n");
2067                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2068
2069                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2070                     sh, op_err, vrf_id, port);
2071                 return (NULL);
2072         }
2073         /* get the correct sctp_nets */
2074         if (netp)
2075                 *netp = sctp_findnet(stcb, init_src);
2076
2077         asoc = &stcb->asoc;
2078         /* get scope variables out of cookie */
2079         asoc->ipv4_local_scope = cookie->ipv4_scope;
2080         asoc->site_scope = cookie->site_scope;
2081         asoc->local_scope = cookie->local_scope;
2082         asoc->loopback_scope = cookie->loopback_scope;
2083
2084         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2085             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2086                 struct mbuf *op_err;
2087
2088                 /*
2089                  * Houston we have a problem. The EP changed while the
2090                  * cookie was in flight. Only recourse is to abort the
2091                  * association.
2092                  */
2093                 atomic_add_int(&stcb->asoc.refcnt, 1);
2094                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2095                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2096                     sh, op_err, vrf_id, port);
2097 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2098                 SCTP_TCB_UNLOCK(stcb);
2099                 SCTP_SOCKET_LOCK(so, 1);
2100                 SCTP_TCB_LOCK(stcb);
2101 #endif
2102                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2103                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
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         /* process the INIT-ACK info (my info) */
2111         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2112         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2113         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2114         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2115         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2116         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2117         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2118         asoc->str_reset_seq_in = asoc->init_seq_number;
2119
2120         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2121
2122         /* process the INIT info (peer's info) */
2123         if (netp)
2124                 retval = sctp_process_init(init_cp, stcb);
2125         else
2126                 retval = 0;
2127         if (retval < 0) {
2128                 atomic_add_int(&stcb->asoc.refcnt, 1);
2129 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2130                 SCTP_TCB_UNLOCK(stcb);
2131                 SCTP_SOCKET_LOCK(so, 1);
2132                 SCTP_TCB_LOCK(stcb);
2133 #endif
2134                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2135 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2136                 SCTP_SOCKET_UNLOCK(so, 1);
2137 #endif
2138                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2139                 return (NULL);
2140         }
2141         /* load all addresses */
2142         if (sctp_load_addresses_from_init(stcb, m,
2143             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2144             init_src)) {
2145                 atomic_add_int(&stcb->asoc.refcnt, 1);
2146 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2147                 SCTP_TCB_UNLOCK(stcb);
2148                 SCTP_SOCKET_LOCK(so, 1);
2149                 SCTP_TCB_LOCK(stcb);
2150 #endif
2151                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2152 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2153                 SCTP_SOCKET_UNLOCK(so, 1);
2154 #endif
2155                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2156                 return (NULL);
2157         }
2158         /*
2159          * verify any preceding AUTH chunk that was skipped
2160          */
2161         /* pull the local authentication parameters from the cookie/init-ack */
2162         sctp_auth_get_cookie_params(stcb, m,
2163             initack_offset + sizeof(struct sctp_init_ack_chunk),
2164             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2165         if (auth_skipped) {
2166                 struct sctp_auth_chunk *auth;
2167
2168                 auth = (struct sctp_auth_chunk *)
2169                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2170                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2171                         /* auth HMAC failed, dump the assoc and packet */
2172                         SCTPDBG(SCTP_DEBUG_AUTH1,
2173                             "COOKIE-ECHO: AUTH failed\n");
2174                         atomic_add_int(&stcb->asoc.refcnt, 1);
2175 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2176                         SCTP_TCB_UNLOCK(stcb);
2177                         SCTP_SOCKET_LOCK(so, 1);
2178                         SCTP_TCB_LOCK(stcb);
2179 #endif
2180                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2181 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2182                         SCTP_SOCKET_UNLOCK(so, 1);
2183 #endif
2184                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2185                         return (NULL);
2186                 } else {
2187                         /* remaining chunks checked... good to go */
2188                         stcb->asoc.authenticated = 1;
2189                 }
2190         }
2191         /* update current state */
2192         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2193         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2194         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2195                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2196                     stcb->sctp_ep, stcb, asoc->primary_destination);
2197         }
2198         sctp_stop_all_cookie_timers(stcb);
2199         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2200         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2201
2202         /*
2203          * if we're doing ASCONFs, check to see if we have any new local
2204          * addresses that need to get added to the peer (eg. addresses
2205          * changed while cookie echo in flight).  This needs to be done
2206          * after we go to the OPEN state to do the correct asconf
2207          * processing. else, make sure we have the correct addresses in our
2208          * lists
2209          */
2210
2211         /* warning, we re-use sin, sin6, sa_store here! */
2212         /* pull in local_address (our "from" address) */
2213         switch (cookie->laddr_type) {
2214 #ifdef INET
2215         case SCTP_IPV4_ADDRESS:
2216                 /* source addr is IPv4 */
2217                 sin = (struct sockaddr_in *)initack_src;
2218                 memset(sin, 0, sizeof(*sin));
2219                 sin->sin_family = AF_INET;
2220                 sin->sin_len = sizeof(struct sockaddr_in);
2221                 sin->sin_addr.s_addr = cookie->laddress[0];
2222                 break;
2223 #endif
2224 #ifdef INET6
2225         case SCTP_IPV6_ADDRESS:
2226                 /* source addr is IPv6 */
2227                 sin6 = (struct sockaddr_in6 *)initack_src;
2228                 memset(sin6, 0, sizeof(*sin6));
2229                 sin6->sin6_family = AF_INET6;
2230                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2231                 sin6->sin6_scope_id = cookie->scope_id;
2232                 memcpy(&sin6->sin6_addr, cookie->laddress,
2233                     sizeof(sin6->sin6_addr));
2234                 break;
2235 #endif
2236         default:
2237                 atomic_add_int(&stcb->asoc.refcnt, 1);
2238 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2239                 SCTP_TCB_UNLOCK(stcb);
2240                 SCTP_SOCKET_LOCK(so, 1);
2241                 SCTP_TCB_LOCK(stcb);
2242 #endif
2243                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2244 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2245                 SCTP_SOCKET_UNLOCK(so, 1);
2246 #endif
2247                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2248                 return (NULL);
2249         }
2250
2251         /* set up to notify upper layer */
2252         *notification = SCTP_NOTIFY_ASSOC_UP;
2253         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2254             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2255             (inp->sctp_socket->so_qlimit == 0)) {
2256                 /*
2257                  * This is an endpoint that called connect() how it got a
2258                  * cookie that is NEW is a bit of a mystery. It must be that
2259                  * the INIT was sent, but before it got there.. a complete
2260                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2261                  * should have went to the other code.. not here.. oh well..
2262                  * a bit of protection is worth having..
2263                  */
2264                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2265 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2266                 atomic_add_int(&stcb->asoc.refcnt, 1);
2267                 SCTP_TCB_UNLOCK(stcb);
2268                 SCTP_SOCKET_LOCK(so, 1);
2269                 SCTP_TCB_LOCK(stcb);
2270                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2271                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2272                         SCTP_SOCKET_UNLOCK(so, 1);
2273                         return (NULL);
2274                 }
2275 #endif
2276                 soisconnected(stcb->sctp_socket);
2277 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2278                 SCTP_SOCKET_UNLOCK(so, 1);
2279 #endif
2280         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2281             (inp->sctp_socket->so_qlimit)) {
2282                 /*
2283                  * We don't want to do anything with this one. Since it is
2284                  * the listening guy. The timer will get started for
2285                  * accepted connections in the caller.
2286                  */
2287                 ;
2288         }
2289         /* since we did not send a HB make sure we don't double things */
2290         if ((netp) && (*netp))
2291                 (*netp)->hb_responded = 1;
2292
2293         if (stcb->asoc.sctp_autoclose_ticks &&
2294             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2295                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2296         }
2297         /* calculate the RTT */
2298         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2299         if ((netp) && (*netp)) {
2300                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2301                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2302                     SCTP_RTT_FROM_NON_DATA);
2303         }
2304         /* respond with a COOKIE-ACK */
2305         sctp_send_cookie_ack(stcb);
2306
2307         /*
2308          * check the address lists for any ASCONFs that need to be sent
2309          * AFTER the cookie-ack is sent
2310          */
2311         sctp_check_address_list(stcb, m,
2312             initack_offset + sizeof(struct sctp_init_ack_chunk),
2313             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2314             initack_src, cookie->local_scope, cookie->site_scope,
2315             cookie->ipv4_scope, cookie->loopback_scope);
2316
2317
2318         return (stcb);
2319 }
2320
2321 /*
2322  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2323  * we NEED to make sure we are not already using the vtag. If so we
2324  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2325         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2326                                                             SCTP_BASE_INFO(hashasocmark))];
2327         LIST_FOREACH(stcb, head, sctp_asocs) {
2328                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2329                        -- SEND ABORT - TRY AGAIN --
2330                 }
2331         }
2332 */
2333
2334 /*
2335  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2336  * existing (non-NULL) TCB
2337  */
2338 static struct mbuf *
2339 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2340     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2341     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2342     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2343     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2344 {
2345         struct sctp_state_cookie *cookie;
2346         struct sctp_tcb *l_stcb = *stcb;
2347         struct sctp_inpcb *l_inp;
2348         struct sockaddr *to;
2349         struct sctp_pcb *ep;
2350         struct mbuf *m_sig;
2351         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2352         uint8_t *sig;
2353         uint8_t cookie_ok = 0;
2354         unsigned int size_of_pkt, sig_offset, cookie_offset;
2355         unsigned int cookie_len;
2356         struct timeval now;
2357         struct timeval time_expires;
2358         struct sockaddr_storage dest_store;
2359         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2360         struct ip *iph;
2361         int notification = 0;
2362         struct sctp_nets *netl;
2363         int had_a_existing_tcb = 0;
2364         int send_int_conf = 0;
2365
2366 #ifdef INET
2367         struct sockaddr_in sin;
2368
2369 #endif
2370 #ifdef INET6
2371         struct sockaddr_in6 sin6;
2372
2373 #endif
2374
2375         SCTPDBG(SCTP_DEBUG_INPUT2,
2376             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2377
2378         if (inp_p == NULL) {
2379                 return (NULL);
2380         }
2381         /* First get the destination address setup too. */
2382         iph = mtod(m, struct ip *);
2383         switch (iph->ip_v) {
2384 #ifdef INET
2385         case IPVERSION:
2386                 {
2387                         /* its IPv4 */
2388                         struct sockaddr_in *lsin;
2389
2390                         lsin = (struct sockaddr_in *)(localep_sa);
2391                         memset(lsin, 0, sizeof(*lsin));
2392                         lsin->sin_family = AF_INET;
2393                         lsin->sin_len = sizeof(*lsin);
2394                         lsin->sin_port = sh->dest_port;
2395                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2396                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2397                         break;
2398                 }
2399 #endif
2400 #ifdef INET6
2401         case IPV6_VERSION >> 4:
2402                 {
2403                         /* its IPv6 */
2404                         struct ip6_hdr *ip6;
2405                         struct sockaddr_in6 *lsin6;
2406
2407                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2408                         memset(lsin6, 0, sizeof(*lsin6));
2409                         lsin6->sin6_family = AF_INET6;
2410                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2411                         ip6 = mtod(m, struct ip6_hdr *);
2412                         lsin6->sin6_port = sh->dest_port;
2413                         lsin6->sin6_addr = ip6->ip6_dst;
2414                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2415                         break;
2416                 }
2417 #endif
2418         default:
2419                 return (NULL);
2420         }
2421
2422         cookie = &cp->cookie;
2423         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2424         cookie_len = ntohs(cp->ch.chunk_length);
2425
2426         if ((cookie->peerport != sh->src_port) &&
2427             (cookie->myport != sh->dest_port) &&
2428             (cookie->my_vtag != sh->v_tag)) {
2429                 /*
2430                  * invalid ports or bad tag.  Note that we always leave the
2431                  * v_tag in the header in network order and when we stored
2432                  * it in the my_vtag slot we also left it in network order.
2433                  * This maintains the match even though it may be in the
2434                  * opposite byte order of the machine :->
2435                  */
2436                 return (NULL);
2437         }
2438         if (cookie_len > size_of_pkt ||
2439             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2440             sizeof(struct sctp_init_chunk) +
2441             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2442                 /* cookie too long!  or too small */
2443                 return (NULL);
2444         }
2445         /*
2446          * split off the signature into its own mbuf (since it should not be
2447          * calculated in the sctp_hmac_m() call).
2448          */
2449         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2450         if (sig_offset > size_of_pkt) {
2451                 /* packet not correct size! */
2452                 /* XXX this may already be accounted for earlier... */
2453                 return (NULL);
2454         }
2455         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2456         if (m_sig == NULL) {
2457                 /* out of memory or ?? */
2458                 return (NULL);
2459         }
2460 #ifdef SCTP_MBUF_LOGGING
2461         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2462                 struct mbuf *mat;
2463
2464                 mat = m_sig;
2465                 while (mat) {
2466                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2467                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2468                         }
2469                         mat = SCTP_BUF_NEXT(mat);
2470                 }
2471         }
2472 #endif
2473
2474         /*
2475          * compute the signature/digest for the cookie
2476          */
2477         ep = &(*inp_p)->sctp_ep;
2478         l_inp = *inp_p;
2479         if (l_stcb) {
2480                 SCTP_TCB_UNLOCK(l_stcb);
2481         }
2482         SCTP_INP_RLOCK(l_inp);
2483         if (l_stcb) {
2484                 SCTP_TCB_LOCK(l_stcb);
2485         }
2486         /* which cookie is it? */
2487         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2488             (ep->current_secret_number != ep->last_secret_number)) {
2489                 /* it's the old cookie */
2490                 (void)sctp_hmac_m(SCTP_HMAC,
2491                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2492                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2493         } else {
2494                 /* it's the current cookie */
2495                 (void)sctp_hmac_m(SCTP_HMAC,
2496                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2497                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2498         }
2499         /* get the signature */
2500         SCTP_INP_RUNLOCK(l_inp);
2501         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2502         if (sig == NULL) {
2503                 /* couldn't find signature */
2504                 sctp_m_freem(m_sig);
2505                 return (NULL);
2506         }
2507         /* compare the received digest with the computed digest */
2508         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2509                 /* try the old cookie? */
2510                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2511                     (ep->current_secret_number != ep->last_secret_number)) {
2512                         /* compute digest with old */
2513                         (void)sctp_hmac_m(SCTP_HMAC,
2514                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2515                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2516                         /* compare */
2517                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2518                                 cookie_ok = 1;
2519                 }
2520         } else {
2521                 cookie_ok = 1;
2522         }
2523
2524         /*
2525          * Now before we continue we must reconstruct our mbuf so that
2526          * normal processing of any other chunks will work.
2527          */
2528         {
2529                 struct mbuf *m_at;
2530
2531                 m_at = m;
2532                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2533                         m_at = SCTP_BUF_NEXT(m_at);
2534                 }
2535                 SCTP_BUF_NEXT(m_at) = m_sig;
2536         }
2537
2538         if (cookie_ok == 0) {
2539                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2540                 SCTPDBG(SCTP_DEBUG_INPUT2,
2541                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2542                     (uint32_t) offset, cookie_offset, sig_offset);
2543                 return (NULL);
2544         }
2545         /*
2546          * check the cookie timestamps to be sure it's not stale
2547          */
2548         (void)SCTP_GETTIME_TIMEVAL(&now);
2549         /* Expire time is in Ticks, so we convert to seconds */
2550         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2551         time_expires.tv_usec = cookie->time_entered.tv_usec;
2552         /*
2553          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2554          * is undefined.
2555          */
2556         if (timevalcmp(&now, &time_expires, >)) {
2557                 /* cookie is stale! */
2558                 struct mbuf *op_err;
2559                 struct sctp_stale_cookie_msg *scm;
2560                 uint32_t tim;
2561
2562                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2563                     0, M_DONTWAIT, 1, MT_DATA);
2564                 if (op_err == NULL) {
2565                         /* FOOBAR */
2566                         return (NULL);
2567                 }
2568                 /* Set the len */
2569                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2570                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2571                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2572                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2573                     (sizeof(uint32_t))));
2574                 /* seconds to usec */
2575                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2576                 /* add in usec */
2577                 if (tim == 0)
2578                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2579                 scm->time_usec = htonl(tim);
2580                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2581                     vrf_id, port);
2582                 return (NULL);
2583         }
2584         /*
2585          * Now we must see with the lookup address if we have an existing
2586          * asoc. This will only happen if we were in the COOKIE-WAIT state
2587          * and a INIT collided with us and somewhere the peer sent the
2588          * cookie on another address besides the single address our assoc
2589          * had for him. In this case we will have one of the tie-tags set at
2590          * least AND the address field in the cookie can be used to look it
2591          * up.
2592          */
2593         to = NULL;
2594         switch (cookie->addr_type) {
2595 #ifdef INET6
2596         case SCTP_IPV6_ADDRESS:
2597                 memset(&sin6, 0, sizeof(sin6));
2598                 sin6.sin6_family = AF_INET6;
2599                 sin6.sin6_len = sizeof(sin6);
2600                 sin6.sin6_port = sh->src_port;
2601                 sin6.sin6_scope_id = cookie->scope_id;
2602                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2603                     sizeof(sin6.sin6_addr.s6_addr));
2604                 to = (struct sockaddr *)&sin6;
2605                 break;
2606 #endif
2607 #ifdef INET
2608         case SCTP_IPV4_ADDRESS:
2609                 memset(&sin, 0, sizeof(sin));
2610                 sin.sin_family = AF_INET;
2611                 sin.sin_len = sizeof(sin);
2612                 sin.sin_port = sh->src_port;
2613                 sin.sin_addr.s_addr = cookie->address[0];
2614                 to = (struct sockaddr *)&sin;
2615                 break;
2616 #endif
2617         default:
2618                 /* This should not happen */
2619                 return (NULL);
2620         }
2621         if ((*stcb == NULL) && to) {
2622                 /* Yep, lets check */
2623                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2624                 if (*stcb == NULL) {
2625                         /*
2626                          * We should have only got back the same inp. If we
2627                          * got back a different ep we have a problem. The
2628                          * original findep got back l_inp and now
2629                          */
2630                         if (l_inp != *inp_p) {
2631                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2632                         }
2633                 } else {
2634                         if (*locked_tcb == NULL) {
2635                                 /*
2636                                  * In this case we found the assoc only
2637                                  * after we locked the create lock. This
2638                                  * means we are in a colliding case and we
2639                                  * must make sure that we unlock the tcb if
2640                                  * its one of the cases where we throw away
2641                                  * the incoming packets.
2642                                  */
2643                                 *locked_tcb = *stcb;
2644
2645                                 /*
2646                                  * We must also increment the inp ref count
2647                                  * since the ref_count flags was set when we
2648                                  * did not find the TCB, now we found it
2649                                  * which reduces the refcount.. we must
2650                                  * raise it back out to balance it all :-)
2651                                  */
2652                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2653                                 if ((*stcb)->sctp_ep != l_inp) {
2654                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2655                                             (*stcb)->sctp_ep, l_inp);
2656                                 }
2657                         }
2658                 }
2659         }
2660         if (to == NULL) {
2661                 return (NULL);
2662         }
2663         cookie_len -= SCTP_SIGNATURE_SIZE;
2664         if (*stcb == NULL) {
2665                 /* this is the "normal" case... get a new TCB */
2666                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2667                     cookie_len, *inp_p, netp, to, &notification,
2668                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2669         } else {
2670                 /* this is abnormal... cookie-echo on existing TCB */
2671                 had_a_existing_tcb = 1;
2672                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2673                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2674                     &notification, vrf_id, auth_skipped, auth_offset, auth_len, port);
2675         }
2676
2677         if (*stcb == NULL) {
2678                 /* still no TCB... must be bad cookie-echo */
2679                 return (NULL);
2680         }
2681         if ((*netp != NULL) && (m->m_flags & M_FLOWID)) {
2682                 (*netp)->flowid = m->m_pkthdr.flowid;
2683 #ifdef INVARIANTS
2684                 (*netp)->flowidset = 1;
2685 #endif
2686         }
2687         /*
2688          * Ok, we built an association so confirm the address we sent the
2689          * INIT-ACK to.
2690          */
2691         netl = sctp_findnet(*stcb, to);
2692         /*
2693          * This code should in theory NOT run but
2694          */
2695         if (netl == NULL) {
2696                 /* TSNH! Huh, why do I need to add this address here? */
2697                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2698                         return (NULL);
2699                 }
2700                 netl = sctp_findnet(*stcb, to);
2701         }
2702         if (netl) {
2703                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2704                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2705                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2706                             netl);
2707                         send_int_conf = 1;
2708                 }
2709         }
2710         sctp_start_net_timers(*stcb);
2711         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2712                 if (!had_a_existing_tcb ||
2713                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2714                         /*
2715                          * If we have a NEW cookie or the connect never
2716                          * reached the connected state during collision we
2717                          * must do the TCP accept thing.
2718                          */
2719                         struct socket *so, *oso;
2720                         struct sctp_inpcb *inp;
2721
2722                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2723                                 /*
2724                                  * For a restart we will keep the same
2725                                  * socket, no need to do anything. I THINK!!
2726                                  */
2727                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2728                                 if (send_int_conf) {
2729                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2730                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2731                                 }
2732                                 return (m);
2733                         }
2734                         oso = (*inp_p)->sctp_socket;
2735                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2736                         SCTP_TCB_UNLOCK((*stcb));
2737                         CURVNET_SET(oso->so_vnet);
2738                         so = sonewconn(oso, 0
2739                             );
2740                         CURVNET_RESTORE();
2741                         SCTP_TCB_LOCK((*stcb));
2742                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2743
2744                         if (so == NULL) {
2745                                 struct mbuf *op_err;
2746
2747 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2748                                 struct socket *pcb_so;
2749
2750 #endif
2751                                 /* Too many sockets */
2752                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2753                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2754                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2755                                     sh, op_err, vrf_id, port);
2756 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2757                                 pcb_so = SCTP_INP_SO(*inp_p);
2758                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2759                                 SCTP_TCB_UNLOCK((*stcb));
2760                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2761                                 SCTP_TCB_LOCK((*stcb));
2762                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2763 #endif
2764                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2765 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2766                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2767 #endif
2768                                 return (NULL);
2769                         }
2770                         inp = (struct sctp_inpcb *)so->so_pcb;
2771                         SCTP_INP_INCR_REF(inp);
2772                         /*
2773                          * We add the unbound flag here so that if we get an
2774                          * soabort() before we get the move_pcb done, we
2775                          * will properly cleanup.
2776                          */
2777                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2778                             SCTP_PCB_FLAGS_CONNECTED |
2779                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2780                             SCTP_PCB_FLAGS_UNBOUND |
2781                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2782                             SCTP_PCB_FLAGS_DONT_WAKE);
2783                         inp->sctp_features = (*inp_p)->sctp_features;
2784                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2785                         inp->sctp_socket = so;
2786                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2787                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2788                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2789                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2790                         inp->sctp_context = (*inp_p)->sctp_context;
2791                         inp->inp_starting_point_for_iterator = NULL;
2792                         /*
2793                          * copy in the authentication parameters from the
2794                          * original endpoint
2795                          */
2796                         if (inp->sctp_ep.local_hmacs)
2797                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2798                         inp->sctp_ep.local_hmacs =
2799                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2800                         if (inp->sctp_ep.local_auth_chunks)
2801                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2802                         inp->sctp_ep.local_auth_chunks =
2803                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2804
2805                         /*
2806                          * Now we must move it from one hash table to
2807                          * another and get the tcb in the right place.
2808                          */
2809
2810                         /*
2811                          * This is where the one-2-one socket is put into
2812                          * the accept state waiting for the accept!
2813                          */
2814                         if (*stcb) {
2815                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2816                         }
2817                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2818
2819                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2820                         SCTP_TCB_UNLOCK((*stcb));
2821
2822                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2823                             0);
2824                         SCTP_TCB_LOCK((*stcb));
2825                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2826
2827
2828                         /*
2829                          * now we must check to see if we were aborted while
2830                          * the move was going on and the lock/unlock
2831                          * happened.
2832                          */
2833                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2834                                 /*
2835                                  * yep it was, we leave the assoc attached
2836                                  * to the socket since the sctp_inpcb_free()
2837                                  * call will send an abort for us.
2838                                  */
2839                                 SCTP_INP_DECR_REF(inp);
2840                                 return (NULL);
2841                         }
2842                         SCTP_INP_DECR_REF(inp);
2843                         /* Switch over to the new guy */
2844                         *inp_p = inp;
2845                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2846                         if (send_int_conf) {
2847                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2848                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2849                         }
2850                         /*
2851                          * Pull it from the incomplete queue and wake the
2852                          * guy
2853                          */
2854 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2855                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2856                         SCTP_TCB_UNLOCK((*stcb));
2857                         SCTP_SOCKET_LOCK(so, 1);
2858 #endif
2859                         soisconnected(so);
2860 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2861                         SCTP_TCB_LOCK((*stcb));
2862                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2863                         SCTP_SOCKET_UNLOCK(so, 1);
2864 #endif
2865                         return (m);
2866                 }
2867         }
2868         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2869                 if (notification) {
2870                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2871                 }
2872                 if (send_int_conf) {
2873                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2874                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2875                 }
2876         }
2877         return (m);
2878 }
2879
2880 static void
2881 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2882     struct sctp_tcb *stcb, struct sctp_nets *net)
2883 {
2884         /* cp must not be used, others call this without a c-ack :-) */
2885         struct sctp_association *asoc;
2886
2887         SCTPDBG(SCTP_DEBUG_INPUT2,
2888             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2889         if (stcb == NULL)
2890                 return;
2891
2892         asoc = &stcb->asoc;
2893
2894         sctp_stop_all_cookie_timers(stcb);
2895         /* process according to association state */
2896         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2897                 /* state change only needed when I am in right state */
2898                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2899                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2900                 sctp_start_net_timers(stcb);
2901                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2902                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2903                             stcb->sctp_ep, stcb, asoc->primary_destination);
2904
2905                 }
2906                 /* update RTO */
2907                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2908                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2909                 if (asoc->overall_error_count == 0) {
2910                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2911                             &asoc->time_entered, sctp_align_safe_nocopy,
2912                             SCTP_RTT_FROM_NON_DATA);
2913                 }
2914                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2915                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2916                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2917                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2918 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2919                         struct socket *so;
2920
2921 #endif
2922                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2923 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2924                         so = SCTP_INP_SO(stcb->sctp_ep);
2925                         atomic_add_int(&stcb->asoc.refcnt, 1);
2926                         SCTP_TCB_UNLOCK(stcb);
2927                         SCTP_SOCKET_LOCK(so, 1);
2928                         SCTP_TCB_LOCK(stcb);
2929                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2930 #endif
2931                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2932                                 soisconnected(stcb->sctp_socket);
2933                         }
2934 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2935                         SCTP_SOCKET_UNLOCK(so, 1);
2936 #endif
2937                 }
2938                 /*
2939                  * since we did not send a HB make sure we don't double
2940                  * things
2941                  */
2942                 net->hb_responded = 1;
2943
2944                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2945                         /*
2946                          * We don't need to do the asconf thing, nor hb or
2947                          * autoclose if the socket is closed.
2948                          */
2949                         goto closed_socket;
2950                 }
2951                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2952                     stcb, net);
2953
2954
2955                 if (stcb->asoc.sctp_autoclose_ticks &&
2956                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2957                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2958                             stcb->sctp_ep, stcb, NULL);
2959                 }
2960                 /*
2961                  * send ASCONF if parameters are pending and ASCONFs are
2962                  * allowed (eg. addresses changed when init/cookie echo were
2963                  * in flight)
2964                  */
2965                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2966                     (stcb->asoc.peer_supports_asconf) &&
2967                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2968 #ifdef SCTP_TIMER_BASED_ASCONF
2969                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2970                             stcb->sctp_ep, stcb,
2971                             stcb->asoc.primary_destination);
2972 #else
2973                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2974                             SCTP_ADDR_NOT_LOCKED);
2975 #endif
2976                 }
2977         }
2978 closed_socket:
2979         /* Toss the cookie if I can */
2980         sctp_toss_old_cookies(stcb, asoc);
2981         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2982                 /* Restart the timer if we have pending data */
2983                 struct sctp_tmit_chunk *chk;
2984
2985                 chk = TAILQ_FIRST(&asoc->sent_queue);
2986                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2987         }
2988 }
2989
2990 static void
2991 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2992     struct sctp_tcb *stcb)
2993 {
2994         struct sctp_nets *net;
2995         struct sctp_tmit_chunk *lchk;
2996         struct sctp_ecne_chunk bkup;
2997         uint8_t override_bit;
2998         uint32_t tsn, window_data_tsn;
2999         int len;
3000         unsigned int pkt_cnt;
3001
3002         len = ntohs(cp->ch.chunk_length);
3003         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3004             (len != sizeof(struct old_sctp_ecne_chunk))) {
3005                 return;
3006         }
3007         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3008                 /* Its the old format */
3009                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3010                 bkup.num_pkts_since_cwr = htonl(1);
3011                 cp = &bkup;
3012         }
3013         SCTP_STAT_INCR(sctps_recvecne);
3014         tsn = ntohl(cp->tsn);
3015         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3016         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3017         if (lchk == NULL) {
3018                 window_data_tsn = stcb->asoc.sending_seq - 1;
3019         } else {
3020                 window_data_tsn = lchk->rec.data.TSN_seq;
3021         }
3022
3023         /* Find where it was sent to if possible. */
3024         net = NULL;
3025         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3026                 if (lchk->rec.data.TSN_seq == tsn) {
3027                         net = lchk->whoTo;
3028                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3029                         break;
3030                 }
3031                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3032                         break;
3033                 }
3034         }
3035         if (net == NULL) {
3036                 /*
3037                  * What to do. A previous send of a CWR was possibly lost.
3038                  * See how old it is, we may have it marked on the actual
3039                  * net.
3040                  */
3041                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3042                         if (tsn == net->last_cwr_tsn) {
3043                                 /* Found him, send it off */
3044                                 break;
3045                         }
3046                 }
3047                 if (net == NULL) {
3048                         /*
3049                          * If we reach here, we need to send a special CWR
3050                          * that says hey, we did this a long time ago and
3051                          * you lost the response.
3052                          */
3053                         net = TAILQ_FIRST(&stcb->asoc.nets);
3054                         if (net == NULL) {
3055                                 /* TSNH */
3056                                 return;
3057                         }
3058                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3059                 } else {
3060                         override_bit = 0;
3061                 }
3062         } else {
3063                 override_bit = 0;
3064         }
3065         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3066             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3067                 /*
3068                  * JRS - Use the congestion control given in the pluggable
3069                  * CC module
3070                  */
3071                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3072                 /*
3073                  * We reduce once every RTT. So we will only lower cwnd at
3074                  * the next sending seq i.e. the window_data_tsn
3075                  */
3076                 net->cwr_window_tsn = window_data_tsn;
3077                 net->ecn_ce_pkt_cnt += pkt_cnt;
3078                 net->lost_cnt = pkt_cnt;
3079                 net->last_cwr_tsn = tsn;
3080         } else {
3081                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3082                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3083                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3084                         /*
3085                          * Another loss in the same window update how many
3086                          * marks/packets lost we have had.
3087                          */
3088                         int cnt = 1;
3089
3090                         if (pkt_cnt > net->lost_cnt) {
3091                                 /* Should be the case */
3092                                 cnt = (pkt_cnt - net->lost_cnt);
3093                                 net->ecn_ce_pkt_cnt += cnt;
3094                         }
3095                         net->lost_cnt = pkt_cnt;
3096                         net->last_cwr_tsn = tsn;
3097                         /*
3098                          * Most CC functions will ignore this call, since we
3099                          * are in-window yet of the initial CE the peer saw.
3100                          */
3101                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3102                 }
3103         }
3104         /*
3105          * We always send a CWR this way if our previous one was lost our
3106          * peer will get an update, or if it is not time again to reduce we
3107          * still get the cwr to the peer. Note we set the override when we
3108          * could not find the TSN on the chunk or the destination network.
3109          */
3110         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3111 }
3112
3113 static void
3114 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3115 {
3116         /*
3117          * Here we get a CWR from the peer. We must look in the outqueue and
3118          * make sure that we have a covered ECNE in teh control chunk part.
3119          * If so remove it.
3120          */
3121         struct sctp_tmit_chunk *chk;
3122         struct sctp_ecne_chunk *ecne;
3123         int override;
3124         uint32_t cwr_tsn;
3125
3126         cwr_tsn = ntohl(cp->tsn);
3127
3128         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3129         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3130                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3131                         continue;
3132                 }
3133                 if ((override == 0) && (chk->whoTo != net)) {
3134                         /* Must be from the right src unless override is set */
3135                         continue;
3136                 }
3137                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3138                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3139                         /* this covers this ECNE, we can remove it */
3140                         stcb->asoc.ecn_echo_cnt_onq--;
3141                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3142                             sctp_next);
3143                         if (chk->data) {
3144                                 sctp_m_freem(chk->data);
3145                                 chk->data = NULL;
3146                         }
3147                         stcb->asoc.ctrl_queue_cnt--;
3148                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3149                         if (override == 0) {
3150                                 break;
3151                         }
3152                 }
3153         }
3154 }
3155
3156 static void
3157 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3158     struct sctp_tcb *stcb, struct sctp_nets *net)
3159 {
3160         struct sctp_association *asoc;
3161
3162 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3163         struct socket *so;
3164
3165 #endif
3166
3167         SCTPDBG(SCTP_DEBUG_INPUT2,
3168             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3169         if (stcb == NULL)
3170                 return;
3171
3172         asoc = &stcb->asoc;
3173         /* process according to association state */
3174         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3175                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3176                 SCTPDBG(SCTP_DEBUG_INPUT2,
3177                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3178                 SCTP_TCB_UNLOCK(stcb);
3179                 return;
3180         }
3181         /* notify upper layer protocol */
3182         if (stcb->sctp_socket) {
3183                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3184                 /* are the queues empty? they should be */
3185                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3186                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3187                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3188                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3189                 }
3190         }
3191         /* stop the timer */
3192         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3193         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3194         /* free the TCB */
3195         SCTPDBG(SCTP_DEBUG_INPUT2,
3196             "sctp_handle_shutdown_complete: calls free-asoc\n");
3197 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3198         so = SCTP_INP_SO(stcb->sctp_ep);
3199         atomic_add_int(&stcb->asoc.refcnt, 1);
3200         SCTP_TCB_UNLOCK(stcb);
3201         SCTP_SOCKET_LOCK(so, 1);
3202         SCTP_TCB_LOCK(stcb);
3203         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3204 #endif
3205         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3206 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3207         SCTP_SOCKET_UNLOCK(so, 1);
3208 #endif
3209         return;
3210 }
3211
3212 static int
3213 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3214     struct sctp_nets *net, uint8_t flg)
3215 {
3216         switch (desc->chunk_type) {
3217         case SCTP_DATA:
3218                 /* find the tsn to resend (possibly */
3219                 {
3220                         uint32_t tsn;
3221                         struct sctp_tmit_chunk *tp1;
3222
3223                         tsn = ntohl(desc->tsn_ifany);
3224                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3225                                 if (tp1->rec.data.TSN_seq == tsn) {
3226                                         /* found it */
3227                                         break;
3228                                 }
3229                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3230                                         /* not found */
3231                                         tp1 = NULL;
3232                                         break;
3233                                 }
3234                         }
3235                         if (tp1 == NULL) {
3236                                 /*
3237                                  * Do it the other way , aka without paying
3238                                  * attention to queue seq order.
3239                                  */
3240                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3241                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3242                                         if (tp1->rec.data.TSN_seq == tsn) {
3243                                                 /* found it */
3244                                                 break;
3245                                         }
3246                                 }
3247                         }
3248                         if (tp1 == NULL) {
3249                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3250                         }
3251                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3252                                 uint8_t *ddp;
3253
3254                                 if (((flg & SCTP_BADCRC) == 0) &&
3255                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3256                                         return (0);
3257                                 }
3258                                 if ((stcb->asoc.peers_rwnd == 0) &&
3259                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3260                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3261                                         return (0);
3262                                 }
3263                                 if (stcb->asoc.peers_rwnd == 0 &&
3264                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3265                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3266                                         return (0);
3267                                 }
3268                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3269                                     sizeof(struct sctp_data_chunk));
3270                                 {
3271                                         unsigned int iii;
3272
3273                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3274                                             iii++) {
3275                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3276                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3277                                                         return (-1);
3278                                                 }
3279                                         }
3280                                 }
3281
3282                                 if (tp1->do_rtt) {
3283                                         /*
3284                                          * this guy had a RTO calculation
3285                                          * pending on it, cancel it
3286                                          */
3287                                         if (tp1->whoTo->rto_needed == 0) {
3288                                                 tp1->whoTo->rto_needed = 1;
3289                                         }
3290                                         tp1->do_rtt = 0;
3291                                 }
3292                                 SCTP_STAT_INCR(sctps_pdrpmark);
3293                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3294                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3295                                 /*
3296                                  * mark it as if we were doing a FR, since
3297                                  * we will be getting gap ack reports behind
3298                                  * the info from the router.
3299                                  */
3300                                 tp1->rec.data.doing_fast_retransmit = 1;
3301                                 /*
3302                                  * mark the tsn with what sequences can
3303                                  * cause a new FR.
3304                                  */
3305                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3306                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3307                                 } else {
3308                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3309                                 }
3310
3311                                 /* restart the timer */
3312                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3313                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3314                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3315                                     stcb, tp1->whoTo);
3316
3317                                 /* fix counts and things */
3318                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3319                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3320                                             tp1->whoTo->flight_size,
3321                                             tp1->book_size,
3322                                             (uintptr_t) stcb,
3323                                             tp1->rec.data.TSN_seq);
3324                                 }
3325                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3326                                         sctp_flight_size_decrease(tp1);
3327                                         sctp_total_flight_decrease(stcb, tp1);
3328                                 }
3329                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3330                         } {
3331                                 /* audit code */
3332                                 unsigned int audit;
3333
3334                                 audit = 0;
3335                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3336                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3337                                                 audit++;
3338                                 }
3339                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3340                                     sctp_next) {
3341                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3342                                                 audit++;
3343                                 }
3344                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3345                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3346                                             audit, stcb->asoc.sent_queue_retran_cnt);
3347 #ifndef SCTP_AUDITING_ENABLED
3348                                         stcb->asoc.sent_queue_retran_cnt = audit;
3349 #endif
3350                                 }
3351                         }
3352                 }
3353                 break;
3354         case SCTP_ASCONF:
3355                 {
3356                         struct sctp_tmit_chunk *asconf;
3357
3358                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3359                             sctp_next) {
3360                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3361                                         break;
3362                                 }
3363                         }
3364                         if (asconf) {
3365                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3366                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3367                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3368                                 asconf->snd_count--;
3369                         }
3370                 }
3371                 break;
3372         case SCTP_INITIATION:
3373                 /* resend the INIT */
3374                 stcb->asoc.dropped_special_cnt++;
3375                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3376                         /*
3377                          * If we can get it in, in a few attempts we do
3378                          * this, otherwise we let the timer fire.
3379                          */
3380                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3381                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3382                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3383                 }
3384                 break;
3385         case SCTP_SELECTIVE_ACK:
3386         case SCTP_NR_SELECTIVE_ACK:
3387                 /* resend the sack */
3388                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3389                 break;
3390         case SCTP_HEARTBEAT_REQUEST:
3391                 /* resend a demand HB */
3392                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3393                         /*
3394                          * Only retransmit if we KNOW we wont destroy the
3395                          * tcb
3396                          */
3397                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3398                 }
3399                 break;
3400         case SCTP_SHUTDOWN:
3401                 sctp_send_shutdown(stcb, net);
3402                 break;
3403         case SCTP_SHUTDOWN_ACK:
3404                 sctp_send_shutdown_ack(stcb, net);
3405                 break;
3406         case SCTP_COOKIE_ECHO:
3407                 {
3408                         struct sctp_tmit_chunk *cookie;
3409
3410                         cookie = NULL;
3411                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3412                             sctp_next) {
3413                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3414                                         break;
3415                                 }
3416                         }
3417                         if (cookie) {
3418                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3419                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3420                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3421                                 sctp_stop_all_cookie_timers(stcb);
3422                         }
3423                 }
3424                 break;
3425         case SCTP_COOKIE_ACK:
3426                 sctp_send_cookie_ack(stcb);
3427                 break;
3428         case SCTP_ASCONF_ACK:
3429                 /* resend last asconf ack */
3430                 sctp_send_asconf_ack(stcb);
3431                 break;
3432         case SCTP_FORWARD_CUM_TSN:
3433                 send_forward_tsn(stcb, &stcb->asoc);
3434                 break;
3435                 /* can't do anything with these */
3436         case SCTP_PACKET_DROPPED:
3437         case SCTP_INITIATION_ACK:       /* this should not happen */
3438         case SCTP_HEARTBEAT_ACK:
3439         case SCTP_ABORT_ASSOCIATION:
3440         case SCTP_OPERATION_ERROR:
3441         case SCTP_SHUTDOWN_COMPLETE:
3442         case SCTP_ECN_ECHO:
3443         case SCTP_ECN_CWR:
3444         default:
3445                 break;
3446         }
3447         return (0);
3448 }
3449
3450 void
3451 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3452 {
3453         int i;
3454         uint16_t temp;
3455
3456         /*
3457          * We set things to 0xffff since this is the last delivered sequence
3458          * and we will be sending in 0 after the reset.
3459          */
3460
3461         if (number_entries) {
3462                 for (i = 0; i < number_entries; i++) {
3463                         temp = ntohs(list[i]);
3464                         if (temp >= stcb->asoc.streamincnt) {
3465                                 continue;
3466                         }
3467                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3468                 }
3469         } else {
3470                 list = NULL;
3471                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3472                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3473                 }
3474         }
3475         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3476 }
3477
3478 static void
3479 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3480 {
3481         int i;
3482
3483         if (number_entries == 0) {
3484                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3485                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3486                 }
3487         } else if (number_entries) {
3488                 for (i = 0; i < number_entries; i++) {
3489                         uint16_t temp;
3490
3491                         temp = ntohs(list[i]);
3492                         if (temp >= stcb->asoc.streamoutcnt) {
3493                                 /* no such stream */
3494                                 continue;
3495                         }
3496                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3497                 }
3498         }
3499         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3500 }
3501
3502
3503 struct sctp_stream_reset_out_request *
3504 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3505 {
3506         struct sctp_association *asoc;
3507         struct sctp_stream_reset_out_req *req;
3508         struct sctp_stream_reset_out_request *r;
3509         struct sctp_tmit_chunk *chk;
3510         int len, clen;
3511
3512         asoc = &stcb->asoc;
3513         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3514                 asoc->stream_reset_outstanding = 0;
3515                 return (NULL);
3516         }
3517         if (stcb->asoc.str_reset == NULL) {
3518                 asoc->stream_reset_outstanding = 0;
3519                 return (NULL);
3520         }
3521         chk = stcb->asoc.str_reset;
3522         if (chk->data == NULL) {
3523                 return (NULL);
3524         }
3525         if (bchk) {
3526                 /* he wants a copy of the chk pointer */
3527                 *bchk = chk;
3528         }
3529         clen = chk->send_size;
3530         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3531         r = &req->sr_req;
3532         if (ntohl(r->request_seq) == seq) {
3533                 /* found it */
3534                 return (r);
3535         }
3536         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3537         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3538                 /* move to the next one, there can only be a max of two */
3539                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3540                 if (ntohl(r->request_seq) == seq) {
3541                         return (r);
3542                 }
3543         }
3544         /* that seq is not here */
3545         return (NULL);
3546 }
3547
3548 static void
3549 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3550 {
3551         struct sctp_association *asoc;
3552         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3553
3554         if (stcb->asoc.str_reset == NULL) {
3555                 return;
3556         }
3557         asoc = &stcb->asoc;
3558
3559         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3560         TAILQ_REMOVE(&asoc->control_send_queue,
3561             chk,
3562             sctp_next);
3563         if (chk->data) {
3564                 sctp_m_freem(chk->data);
3565                 chk->data = NULL;
3566         }
3567         asoc->ctrl_queue_cnt--;
3568         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3569         /* sa_ignore NO_NULL_CHK */
3570         stcb->asoc.str_reset = NULL;
3571 }
3572
3573
3574 static int
3575 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3576     uint32_t seq, uint32_t action,
3577     struct sctp_stream_reset_response *respin)
3578 {
3579         uint16_t type;
3580         int lparm_len;
3581         struct sctp_association *asoc = &stcb->asoc;
3582         struct sctp_tmit_chunk *chk;
3583         struct sctp_stream_reset_out_request *srparam;
3584         int number_entries;
3585
3586         if (asoc->stream_reset_outstanding == 0) {
3587                 /* duplicate */
3588                 return (0);
3589         }
3590         if (seq == stcb->asoc.str_reset_seq_out) {
3591                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3592                 if (srparam) {
3593                         stcb->asoc.str_reset_seq_out++;
3594                         type = ntohs(srparam->ph.param_type);
3595                         lparm_len = ntohs(srparam->ph.param_length);
3596                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3597                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3598                                 asoc->stream_reset_out_is_outstanding = 0;
3599                                 if (asoc->stream_reset_outstanding)
3600                                         asoc->stream_reset_outstanding--;
3601                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3602                                         /* do it */
3603                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3604                                 } else {
3605                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3606                                 }
3607                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3608                                 /* Answered my request */
3609                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3610                                 if (asoc->stream_reset_outstanding)
3611                                         asoc->stream_reset_outstanding--;
3612                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
3613                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3614                                 }
3615                         } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3616                                 /* Ok we now may have more streams */
3617                                 if (asoc->stream_reset_outstanding)
3618                                         asoc->stream_reset_outstanding--;
3619                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3620                                         /* Put the new streams into effect */
3621                                         stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3622                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3623                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3624                                 } else {
3625                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3626                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3627                                 }
3628                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3629                                 /**
3630                                  * a) Adopt the new in tsn.
3631                                  * b) reset the map
3632                                  * c) Adopt the new out-tsn
3633                                  */
3634                                 struct sctp_stream_reset_response_tsn *resp;
3635                                 struct sctp_forward_tsn_chunk fwdtsn;
3636                                 int abort_flag = 0;
3637
3638                                 if (respin == NULL) {
3639                                         /* huh ? */
3640                                         return (0);
3641                                 }
3642                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3643                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3644                                         asoc->stream_reset_outstanding--;
3645                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3646                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3647                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3648                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3649                                         if (abort_flag) {
3650                                                 return (1);
3651                                         }
3652                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3653                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3654                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3655                                         }
3656                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3657                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3658                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3659
3660                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3661                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3662
3663                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3664                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3665
3666                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3667                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3668
3669                                 }
3670                         }
3671                         /* get rid of the request and get the request flags */
3672                         if (asoc->stream_reset_outstanding == 0) {
3673                                 sctp_clean_up_stream_reset(stcb);
3674                         }
3675                 }
3676         }
3677         return (0);
3678 }
3679
3680 static void
3681 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3682     struct sctp_tmit_chunk *chk,
3683     struct sctp_stream_reset_in_request *req, int trunc)
3684 {
3685         uint32_t seq;
3686         int len, i;
3687         int number_entries;
3688         uint16_t temp;
3689
3690         /*
3691          * peer wants me to send a str-reset to him for my outgoing seq's if
3692          * seq_in is right.
3693          */
3694         struct sctp_association *asoc = &stcb->asoc;
3695
3696         seq = ntohl(req->request_seq);
3697         if (asoc->str_reset_seq_in == seq) {
3698                 if (trunc) {
3699                         /* Can't do it, since they exceeded our buffer size  */
3700                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3701                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3702                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3703                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3704                         len = ntohs(req->ph.param_length);
3705                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3706                         for (i = 0; i < number_entries; i++) {
3707                                 temp = ntohs(req->list_of_streams[i]);
3708                                 req->list_of_streams[i] = temp;
3709                         }
3710                         /* move the reset action back one */
3711                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3712                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3713                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3714                             asoc->str_reset_seq_out,
3715                             seq, (asoc->sending_seq - 1));
3716                         asoc->stream_reset_out_is_outstanding = 1;
3717                         asoc->str_reset = chk;
3718                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3719                         stcb->asoc.stream_reset_outstanding++;
3720                 } else {
3721                         /* Can't do it, since we have sent one out */
3722                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3723                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3724                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3725                 }
3726                 asoc->str_reset_seq_in++;
3727         } else if (asoc->str_reset_seq_in - 1 == seq) {
3728                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3729         } else if (asoc->str_reset_seq_in - 2 == seq) {
3730                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3731         } else {
3732                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3733         }
3734 }
3735
3736 static int
3737 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3738     struct sctp_tmit_chunk *chk,
3739     struct sctp_stream_reset_tsn_request *req)
3740 {
3741         /* reset all in and out and update the tsn */
3742         /*
3743          * A) reset my str-seq's on in and out. B) Select a receive next,
3744          * and set cum-ack to it. Also process this selected number as a
3745          * fwd-tsn as well. C) set in the response my next sending seq.
3746          */
3747         struct sctp_forward_tsn_chunk fwdtsn;
3748         struct sctp_association *asoc = &stcb->asoc;
3749         int abort_flag = 0;
3750         uint32_t seq;
3751
3752         seq = ntohl(req->request_seq);
3753         if (asoc->str_reset_seq_in == seq) {
3754                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3755                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3756                 fwdtsn.ch.chunk_flags = 0;
3757                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3758                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3759                 if (abort_flag) {
3760                         return (1);
3761                 }
3762                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3763                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3764                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3765                 }
3766                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3767                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3768                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3769                 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3770                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3771                 atomic_add_int(&stcb->asoc.sending_seq, 1);
3772                 /* save off historical data for retrans */
3773                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3774                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3775                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3776                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3777
3778                 sctp_add_stream_reset_result_tsn(chk,
3779                     ntohl(req->request_seq),
3780                     SCTP_STREAM_RESET_PERFORMED,
3781                     stcb->asoc.sending_seq,
3782                     stcb->asoc.mapping_array_base_tsn);
3783                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3784                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3785                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3786                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3787
3788                 asoc->str_reset_seq_in++;
3789         } else if (asoc->str_reset_seq_in - 1 == seq) {
3790                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3791                     stcb->asoc.last_sending_seq[0],
3792                     stcb->asoc.last_base_tsnsent[0]
3793                     );
3794         } else if (asoc->str_reset_seq_in - 2 == seq) {
3795                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3796                     stcb->asoc.last_sending_seq[1],
3797                     stcb->asoc.last_base_tsnsent[1]
3798                     );
3799         } else {
3800                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3801         }
3802         return (0);
3803 }
3804
3805 static void
3806 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3807     struct sctp_tmit_chunk *chk,
3808     struct sctp_stream_reset_out_request *req, int trunc)
3809 {
3810         uint32_t seq, tsn;
3811         int number_entries, len;
3812         struct sctp_association *asoc = &stcb->asoc;
3813
3814         seq = ntohl(req->request_seq);
3815
3816         /* now if its not a duplicate we process it */
3817         if (asoc->str_reset_seq_in == seq) {
3818                 len = ntohs(req->ph.param_length);
3819                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3820                 /*
3821                  * the sender is resetting, handle the list issue.. we must
3822                  * a) verify if we can do the reset, if so no problem b) If
3823                  * we can't do the reset we must copy the request. c) queue
3824                  * it, and setup the data in processor to trigger it off
3825                  * when needed and dequeue all the queued data.
3826                  */
3827                 tsn = ntohl(req->send_reset_at_tsn);
3828
3829                 /* move the reset action back one */
3830                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3831                 if (trunc) {
3832                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3833                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3834                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3835                         /* we can do it now */
3836                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3837                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3838                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3839                 } else {
3840                         /*
3841                          * we must queue it up and thus wait for the TSN's
3842                          * to arrive that are at or before tsn
3843                          */
3844                         struct sctp_stream_reset_list *liste;
3845                         int siz;
3846
3847                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3848                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3849                             siz, SCTP_M_STRESET);
3850                         if (liste == NULL) {
3851                                 /* gak out of memory */
3852                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3853                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3854                                 return;
3855                         }
3856                         liste->tsn = tsn;
3857                         liste->number_entries = number_entries;
3858                         memcpy(&liste->req, req,
3859                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3860                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3861                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3862                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3863                 }
3864                 asoc->str_reset_seq_in++;
3865         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3866                 /*
3867                  * one seq back, just echo back last action since my
3868                  * response was lost.
3869                  */
3870                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3871         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3872                 /*
3873                  * two seq back, just echo back last action since my
3874                  * response was lost.
3875                  */
3876                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3877         } else {
3878                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3879         }
3880 }
3881
3882 static void
3883 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3884     struct sctp_stream_reset_add_strm *str_add)
3885 {
3886         /*
3887          * Peer is requesting to add more streams. If its within our
3888          * max-streams we will allow it.
3889          */
3890         uint16_t num_stream, i;
3891         uint32_t seq;
3892         struct sctp_association *asoc = &stcb->asoc;
3893         struct sctp_queued_to_read *ctl, *nctl;
3894
3895         /* Get the number. */
3896         seq = ntohl(str_add->request_seq);
3897         num_stream = ntohs(str_add->number_of_streams);
3898         /* Now what would be the new total? */
3899         if (asoc->str_reset_seq_in == seq) {
3900                 num_stream += stcb->asoc.streamincnt;
3901                 if (num_stream > stcb->asoc.max_inbound_streams) {
3902                         /* We must reject it they ask for to many */
3903         denied:
3904                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3905                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3906                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3907                 } else {
3908                         /* Ok, we can do that :-) */
3909                         struct sctp_stream_in *oldstrm;
3910
3911                         /* save off the old */
3912                         oldstrm = stcb->asoc.strmin;
3913                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3914                             (num_stream * sizeof(struct sctp_stream_in)),
3915                             SCTP_M_STRMI);
3916                         if (stcb->asoc.strmin == NULL) {
3917                                 stcb->asoc.strmin = oldstrm;
3918                                 goto denied;
3919                         }
3920                         /* copy off the old data */
3921                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3922                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3923                                 stcb->asoc.strmin[i].stream_no = i;
3924                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3925                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3926                                 /* now anything on those queues? */
3927                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3928                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3929                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3930                                 }
3931                         }
3932                         /* Init the new streams */
3933                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3934                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3935                                 stcb->asoc.strmin[i].stream_no = i;
3936                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3937                                 stcb->asoc.strmin[i].delivery_started = 0;
3938                         }
3939                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3940                         /* update the size */
3941                         stcb->asoc.streamincnt = num_stream;
3942                         /* Send the ack */
3943                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3944                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3945                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3946                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3947                             (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3948                 }
3949         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3950                 /*
3951                  * one seq back, just echo back last action since my
3952                  * response was lost.
3953                  */
3954                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3955         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3956                 /*
3957                  * two seq back, just echo back last action since my
3958                  * response was lost.
3959                  */
3960                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3961         } else {
3962                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3963
3964         }
3965 }
3966
3967 #ifdef __GNUC__
3968 __attribute__((noinline))
3969 #endif
3970         static int
3971             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3972         struct sctp_stream_reset_out_req *sr_req)
3973 {
3974         int chk_length, param_len, ptype;
3975         struct sctp_paramhdr pstore;
3976         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3977
3978         uint32_t seq;
3979         int num_req = 0;
3980         int trunc = 0;
3981         struct sctp_tmit_chunk *chk;
3982         struct sctp_chunkhdr *ch;
3983         struct sctp_paramhdr *ph;
3984         int ret_code = 0;
3985         int num_param = 0;
3986
3987         /* now it may be a reset or a reset-response */
3988         chk_length = ntohs(sr_req->ch.chunk_length);
3989
3990         /* setup for adding the response */
3991         sctp_alloc_a_chunk(stcb, chk);
3992         if (chk == NULL) {
3993                 return (ret_code);
3994         }
3995         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3996         chk->rec.chunk_id.can_take_data = 0;
3997         chk->asoc = &stcb->asoc;
3998         chk->no_fr_allowed = 0;
3999         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4000         chk->book_size_scale = 0;
4001         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4002         if (chk->data == NULL) {
4003 strres_nochunk:
4004                 if (chk->data) {
4005                         sctp_m_freem(chk->data);
4006                         chk->data = NULL;
4007                 }
4008                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4009                 return (ret_code);
4010         }
4011         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4012
4013         /* setup chunk parameters */
4014         chk->sent = SCTP_DATAGRAM_UNSENT;
4015         chk->snd_count = 0;
4016         chk->whoTo = NULL;
4017
4018         ch = mtod(chk->data, struct sctp_chunkhdr *);
4019         ch->chunk_type = SCTP_STREAM_RESET;
4020         ch->chunk_flags = 0;
4021         ch->chunk_length = htons(chk->send_size);
4022         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4023         offset += sizeof(struct sctp_chunkhdr);
4024         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4025                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4026                 if (ph == NULL)
4027                         break;
4028                 param_len = ntohs(ph->param_length);
4029                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4030                         /* bad param */
4031                         break;
4032                 }
4033                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4034                     (uint8_t *) & cstore);
4035                 ptype = ntohs(ph->param_type);
4036                 num_param++;
4037                 if (param_len > (int)sizeof(cstore)) {
4038                         trunc = 1;
4039                 } else {
4040                         trunc = 0;
4041                 }
4042
4043                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4044                         /* hit the max of parameters already sorry.. */
4045                         break;
4046                 }
4047                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4048                         struct sctp_stream_reset_out_request *req_out;
4049
4050                         req_out = (struct sctp_stream_reset_out_request *)ph;
4051                         num_req++;
4052                         if (stcb->asoc.stream_reset_outstanding) {
4053                                 seq = ntohl(req_out->response_seq);
4054                                 if (seq == stcb->asoc.str_reset_seq_out) {
4055                                         /* implicit ack */
4056                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
4057                                 }
4058                         }
4059                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4060                 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
4061                         struct sctp_stream_reset_add_strm *str_add;
4062
4063                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4064                         num_req++;
4065                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4066                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4067                         struct sctp_stream_reset_in_request *req_in;
4068
4069                         num_req++;
4070
4071                         req_in = (struct sctp_stream_reset_in_request *)ph;
4072
4073                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4074                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4075                         struct sctp_stream_reset_tsn_request *req_tsn;
4076
4077                         num_req++;
4078                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4079
4080                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4081                                 ret_code = 1;
4082                                 goto strres_nochunk;
4083                         }
4084                         /* no more */
4085                         break;
4086                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4087                         struct sctp_stream_reset_response *resp;
4088                         uint32_t result;
4089
4090                         resp = (struct sctp_stream_reset_response *)ph;
4091                         seq = ntohl(resp->response_seq);
4092                         result = ntohl(resp->result);
4093                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4094                                 ret_code = 1;
4095                                 goto strres_nochunk;
4096                         }
4097                 } else {
4098                         break;
4099                 }
4100                 offset += SCTP_SIZE32(param_len);
4101                 chk_length -= SCTP_SIZE32(param_len);
4102         }
4103         if (num_req == 0) {
4104                 /* we have no response free the stuff */
4105                 goto strres_nochunk;
4106         }
4107         /* ok we have a chunk to link in */
4108         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4109             chk,
4110             sctp_next);
4111         stcb->asoc.ctrl_queue_cnt++;
4112         return (ret_code);
4113 }
4114
4115 /*
4116  * Handle a router or endpoints report of a packet loss, there are two ways
4117  * to handle this, either we get the whole packet and must disect it
4118  * ourselves (possibly with truncation and or corruption) or it is a summary
4119  * from a middle box that did the disectting for us.
4120  */
4121 static void
4122 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4123     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4124 {
4125         uint32_t bottle_bw, on_queue;
4126         uint16_t trunc_len;
4127         unsigned int chlen;
4128         unsigned int at;
4129         struct sctp_chunk_desc desc;
4130         struct sctp_chunkhdr *ch;
4131
4132         chlen = ntohs(cp->ch.chunk_length);
4133         chlen -= sizeof(struct sctp_pktdrop_chunk);
4134         /* XXX possible chlen underflow */
4135         if (chlen == 0) {
4136                 ch = NULL;
4137                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4138                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4139         } else {
4140                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4141                 chlen -= sizeof(struct sctphdr);
4142                 /* XXX possible chlen underflow */
4143                 memset(&desc, 0, sizeof(desc));
4144         }
4145         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4146         if (trunc_len > limit) {
4147                 trunc_len = limit;
4148         }
4149         /* now the chunks themselves */
4150         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4151                 desc.chunk_type = ch->chunk_type;
4152                 /* get amount we need to move */
4153                 at = ntohs(ch->chunk_length);
4154                 if (at < sizeof(struct sctp_chunkhdr)) {
4155                         /* corrupt chunk, maybe at the end? */
4156                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4157                         break;
4158                 }
4159                 if (trunc_len == 0) {
4160                         /* we are supposed to have all of it */
4161                         if (at > chlen) {
4162                                 /* corrupt skip it */
4163                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4164                                 break;
4165                         }
4166                 } else {
4167                         /* is there enough of it left ? */
4168                         if (desc.chunk_type == SCTP_DATA) {
4169                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4170                                     sizeof(desc.data_bytes))) {
4171                                         break;
4172                                 }
4173                         } else {
4174                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4175                                         break;
4176                                 }
4177                         }
4178                 }
4179                 if (desc.chunk_type == SCTP_DATA) {
4180                         /* can we get out the tsn? */
4181                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4182                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4183
4184                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4185                                 /* yep */
4186                                 struct sctp_data_chunk *dcp;
4187                                 uint8_t *ddp;
4188                                 unsigned int iii;
4189
4190                                 dcp = (struct sctp_data_chunk *)ch;
4191                                 ddp = (uint8_t *) (dcp + 1);
4192                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4193                                         desc.data_bytes[iii] = ddp[iii];
4194                                 }
4195                                 desc.tsn_ifany = dcp->dp.tsn;
4196                         } else {
4197                                 /* nope we are done. */
4198                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4199                                 break;
4200                         }
4201                 } else {
4202                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4203                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4204                 }
4205
4206                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4207                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4208                         break;
4209                 }
4210                 if (SCTP_SIZE32(at) > chlen) {
4211                         break;
4212                 }
4213                 chlen -= SCTP_SIZE32(at);
4214                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4215                         /* done, none left */
4216                         break;
4217                 }
4218                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4219         }
4220         /* Now update any rwnd --- possibly */
4221         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4222                 /* From a peer, we get a rwnd report */
4223                 uint32_t a_rwnd;
4224
4225                 SCTP_STAT_INCR(sctps_pdrpfehos);
4226
4227                 bottle_bw = ntohl(cp->bottle_bw);
4228                 on_queue = ntohl(cp->current_onq);
4229                 if (bottle_bw && on_queue) {
4230                         /* a rwnd report is in here */
4231                         if (bottle_bw > on_queue)
4232                                 a_rwnd = bottle_bw - on_queue;
4233                         else
4234                                 a_rwnd = 0;
4235
4236                         if (a_rwnd == 0)
4237                                 stcb->asoc.peers_rwnd = 0;
4238                         else {
4239                                 if (a_rwnd > stcb->asoc.total_flight) {
4240                                         stcb->asoc.peers_rwnd =
4241                                             a_rwnd - stcb->asoc.total_flight;
4242                                 } else {
4243                                         stcb->asoc.peers_rwnd = 0;
4244                                 }
4245                                 if (stcb->asoc.peers_rwnd <
4246                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4247                                         /* SWS sender side engages */
4248                                         stcb->asoc.peers_rwnd = 0;
4249                                 }
4250                         }
4251                 }
4252         } else {
4253                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4254         }
4255
4256         /* now middle boxes in sat networks get a cwnd bump */
4257         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4258             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4259             (stcb->asoc.sat_network)) {
4260                 /*
4261                  * This is debateable but for sat networks it makes sense
4262                  * Note if a T3 timer has went off, we will prohibit any
4263                  * changes to cwnd until we exit the t3 loss recovery.
4264                  */
4265                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4266                     net, cp, &bottle_bw, &on_queue);
4267         }
4268 }
4269
4270 /*
4271  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4272  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4273  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4274  * length of the complete packet outputs: - length: modified to remaining
4275  * length after control processing - netp: modified to new sctp_nets after
4276  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4277  * bad packet,...) otherwise return the tcb for this packet
4278  */
4279 #ifdef __GNUC__
4280 __attribute__((noinline))
4281 #endif
4282         static struct sctp_tcb *
4283                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4284              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4285              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4286              uint32_t vrf_id, uint16_t port)
4287 {
4288         struct sctp_association *asoc;
4289         uint32_t vtag_in;
4290         int num_chunks = 0;     /* number of control chunks processed */
4291         uint32_t chk_length;
4292         int ret;
4293         int abort_no_unlock = 0;
4294         int ecne_seen = 0;
4295
4296         /*
4297          * How big should this be, and should it be alloc'd? Lets try the
4298          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4299          * until we get into jumbo grams and such..
4300          */
4301         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4302         struct sctp_tcb *locked_tcb = stcb;
4303         int got_auth = 0;
4304         uint32_t auth_offset = 0, auth_len = 0;
4305         int auth_skipped = 0;
4306         int asconf_cnt = 0;
4307
4308 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4309         struct socket *so;
4310
4311 #endif
4312
4313         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4314             iphlen, *offset, length, stcb);
4315
4316         /* validate chunk header length... */
4317         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4318                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4319                     ntohs(ch->chunk_length));
4320                 if (locked_tcb) {
4321                         SCTP_TCB_UNLOCK(locked_tcb);
4322                 }
4323                 return (NULL);
4324         }
4325         /*
4326          * validate the verification tag
4327          */
4328         vtag_in = ntohl(sh->v_tag);
4329
4330         if (locked_tcb) {
4331                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4332         }
4333         if (ch->chunk_type == SCTP_INITIATION) {
4334                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4335                     ntohs(ch->chunk_length), vtag_in);
4336                 if (vtag_in != 0) {
4337                         /* protocol error- silently discard... */
4338                         SCTP_STAT_INCR(sctps_badvtag);
4339                         if (locked_tcb) {
4340                                 SCTP_TCB_UNLOCK(locked_tcb);
4341                         }
4342                         return (NULL);
4343                 }
4344         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4345                 /*
4346                  * If there is no stcb, skip the AUTH chunk and process
4347                  * later after a stcb is found (to validate the lookup was
4348                  * valid.
4349                  */
4350                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4351                     (stcb == NULL) &&
4352                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4353                         /* save this chunk for later processing */
4354                         auth_skipped = 1;
4355                         auth_offset = *offset;
4356                         auth_len = ntohs(ch->chunk_length);
4357
4358                         /* (temporarily) move past this chunk */
4359                         *offset += SCTP_SIZE32(auth_len);
4360                         if (*offset >= length) {
4361                                 /* no more data left in the mbuf chain */
4362                                 *offset = length;
4363                                 if (locked_tcb) {
4364                                         SCTP_TCB_UNLOCK(locked_tcb);
4365                                 }
4366                                 return (NULL);
4367                         }
4368                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4369                             sizeof(struct sctp_chunkhdr), chunk_buf);
4370                 }
4371                 if (ch == NULL) {
4372                         /* Help */
4373                         *offset = length;
4374                         if (locked_tcb) {
4375                                 SCTP_TCB_UNLOCK(locked_tcb);
4376                         }
4377                         return (NULL);
4378                 }
4379                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4380                         goto process_control_chunks;
4381                 }
4382                 /*
4383                  * first check if it's an ASCONF with an unknown src addr we
4384                  * need to look inside to find the association
4385                  */
4386                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4387                         struct sctp_chunkhdr *asconf_ch = ch;
4388                         uint32_t asconf_offset = 0, asconf_len = 0;
4389
4390                         /* inp's refcount may be reduced */
4391                         SCTP_INP_INCR_REF(inp);
4392
4393                         asconf_offset = *offset;
4394                         do {
4395                                 asconf_len = ntohs(asconf_ch->chunk_length);
4396                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4397                                         break;
4398                                 stcb = sctp_findassociation_ep_asconf(m,
4399                                     *offset, sh, &inp, netp, vrf_id);
4400                                 if (stcb != NULL)
4401                                         break;
4402                                 asconf_offset += SCTP_SIZE32(asconf_len);
4403                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4404                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4405                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4406                         if (stcb == NULL) {
4407                                 /*
4408                                  * reduce inp's refcount if not reduced in
4409                                  * sctp_findassociation_ep_asconf().
4410                                  */
4411                                 SCTP_INP_DECR_REF(inp);
4412                         } else {
4413                                 locked_tcb = stcb;
4414                         }
4415
4416                         /* now go back and verify any auth chunk to be sure */
4417                         if (auth_skipped && (stcb != NULL)) {
4418                                 struct sctp_auth_chunk *auth;
4419
4420                                 auth = (struct sctp_auth_chunk *)
4421                                     sctp_m_getptr(m, auth_offset,
4422                                     auth_len, chunk_buf);
4423                                 got_auth = 1;
4424                                 auth_skipped = 0;
4425                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4426                                     auth_offset)) {
4427                                         /* auth HMAC failed so dump it */
4428                                         *offset = length;
4429                                         if (locked_tcb) {
4430                                                 SCTP_TCB_UNLOCK(locked_tcb);
4431                                         }
4432                                         return (NULL);
4433                                 } else {
4434                                         /* remaining chunks are HMAC checked */
4435                                         stcb->asoc.authenticated = 1;
4436                                 }
4437                         }
4438                 }
4439                 if (stcb == NULL) {
4440                         /* no association, so it's out of the blue... */
4441                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4442                             vrf_id, port);
4443                         *offset = length;
4444                         if (locked_tcb) {
4445                                 SCTP_TCB_UNLOCK(locked_tcb);
4446                         }
4447                         return (NULL);
4448                 }
4449                 asoc = &stcb->asoc;
4450                 /* ABORT and SHUTDOWN can use either v_tag... */
4451                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4452                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4453                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4454                         if ((vtag_in == asoc->my_vtag) ||
4455                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4456                             (vtag_in == asoc->peer_vtag))) {
4457                                 /* this is valid */
4458                         } else {
4459                                 /* drop this packet... */
4460                                 SCTP_STAT_INCR(sctps_badvtag);
4461                                 if (locked_tcb) {
4462                                         SCTP_TCB_UNLOCK(locked_tcb);
4463                                 }
4464                                 return (NULL);
4465                         }
4466                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4467                         if (vtag_in != asoc->my_vtag) {
4468                                 /*
4469                                  * this could be a stale SHUTDOWN-ACK or the
4470                                  * peer never got the SHUTDOWN-COMPLETE and
4471                                  * is still hung; we have started a new asoc
4472                                  * but it won't complete until the shutdown
4473                                  * is completed
4474                                  */
4475                                 if (locked_tcb) {
4476                                         SCTP_TCB_UNLOCK(locked_tcb);
4477                                 }
4478                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4479                                     NULL, vrf_id, port);
4480                                 return (NULL);
4481                         }
4482                 } else {
4483                         /* for all other chunks, vtag must match */
4484                         if (vtag_in != asoc->my_vtag) {
4485                                 /* invalid vtag... */
4486                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4487                                     "invalid vtag: %xh, expect %xh\n",
4488                                     vtag_in, asoc->my_vtag);
4489                                 SCTP_STAT_INCR(sctps_badvtag);
4490                                 if (locked_tcb) {
4491                                         SCTP_TCB_UNLOCK(locked_tcb);
4492                                 }
4493                                 *offset = length;
4494                                 return (NULL);
4495                         }
4496                 }
4497         }                       /* end if !SCTP_COOKIE_ECHO */
4498         /*
4499          * process all control chunks...
4500          */
4501         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4502         /* EY */
4503             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4504             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4505             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4506                 /* implied cookie-ack.. we must have lost the ack */
4507                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4508                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4509                             stcb->asoc.overall_error_count,
4510                             0,
4511                             SCTP_FROM_SCTP_INPUT,
4512                             __LINE__);
4513                 }
4514                 stcb->asoc.overall_error_count = 0;
4515                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4516                     *netp);
4517         }
4518 process_control_chunks:
4519         while (IS_SCTP_CONTROL(ch)) {
4520                 /* validate chunk length */
4521                 chk_length = ntohs(ch->chunk_length);
4522                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4523                     ch->chunk_type, chk_length);
4524                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4525                 if (chk_length < sizeof(*ch) ||
4526                     (*offset + (int)chk_length) > length) {
4527                         *offset = length;
4528                         if (locked_tcb) {
4529                                 SCTP_TCB_UNLOCK(locked_tcb);
4530                         }
4531                         return (NULL);
4532                 }
4533                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4534                 /*
4535                  * INIT-ACK only gets the init ack "header" portion only
4536                  * because we don't have to process the peer's COOKIE. All
4537                  * others get a complete chunk.
4538                  */
4539                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4540                     (ch->chunk_type == SCTP_INITIATION)) {
4541                         /* get an init-ack chunk */
4542                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4543                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4544                         if (ch == NULL) {
4545                                 *offset = length;
4546                                 if (locked_tcb) {
4547                                         SCTP_TCB_UNLOCK(locked_tcb);
4548                                 }
4549                                 return (NULL);
4550                         }
4551                 } else {
4552                         /* For cookies and all other chunks. */
4553                         if (chk_length > sizeof(chunk_buf)) {
4554                                 /*
4555                                  * use just the size of the chunk buffer so
4556                                  * the front part of our chunks fit in
4557                                  * contiguous space up to the chunk buffer
4558                                  * size (508 bytes). For chunks that need to
4559                                  * get more than that they must use the
4560                                  * sctp_m_getptr() function or other means
4561                                  * (e.g. know how to parse mbuf chains).
4562                                  * Cookies do this already.
4563                                  */
4564                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4565                                     (sizeof(chunk_buf) - 4),
4566                                     chunk_buf);
4567                                 if (ch == NULL) {
4568                                         *offset = length;
4569                                         if (locked_tcb) {
4570                                                 SCTP_TCB_UNLOCK(locked_tcb);
4571                                         }
4572                                         return (NULL);
4573                                 }
4574                         } else {
4575                                 /* We can fit it all */
4576                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4577                                     chk_length, chunk_buf);
4578                                 if (ch == NULL) {
4579                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4580                                         *offset = length;
4581                                         if (locked_tcb) {
4582                                                 SCTP_TCB_UNLOCK(locked_tcb);
4583                                         }
4584                                         return (NULL);
4585                                 }
4586                         }
4587                 }
4588                 num_chunks++;
4589                 /* Save off the last place we got a control from */
4590                 if (stcb != NULL) {
4591                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4592                                 /*
4593                                  * allow last_control to be NULL if
4594                                  * ASCONF... ASCONF processing will find the
4595                                  * right net later
4596                                  */
4597                                 if ((netp != NULL) && (*netp != NULL))
4598                                         stcb->asoc.last_control_chunk_from = *netp;
4599                         }
4600                 }
4601 #ifdef SCTP_AUDITING_ENABLED
4602                 sctp_audit_log(0xB0, ch->chunk_type);
4603 #endif
4604
4605                 /* check to see if this chunk required auth, but isn't */
4606                 if ((stcb != NULL) &&
4607                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4608                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4609                     !stcb->asoc.authenticated) {
4610                         /* "silently" ignore */
4611                         SCTP_STAT_INCR(sctps_recvauthmissing);
4612                         goto next_chunk;
4613                 }
4614                 switch (ch->chunk_type) {
4615                 case SCTP_INITIATION:
4616                         /* must be first and only chunk */
4617                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4618                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4619                                 /* We are not interested anymore? */
4620                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4621                                         /*
4622                                          * collision case where we are
4623                                          * sending to them too
4624                                          */
4625                                         ;
4626                                 } else {
4627                                         if (locked_tcb) {
4628                                                 SCTP_TCB_UNLOCK(locked_tcb);
4629                                         }
4630                                         *offset = length;
4631                                         return (NULL);
4632                                 }
4633                         }
4634                         if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4635                             (num_chunks > 1) ||
4636                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4637                                 *offset = length;
4638                                 if (locked_tcb) {
4639                                         SCTP_TCB_UNLOCK(locked_tcb);
4640                                 }
4641                                 return (NULL);
4642                         }
4643                         if ((stcb != NULL) &&
4644                             (SCTP_GET_STATE(&stcb->asoc) ==
4645                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4646                                 sctp_send_shutdown_ack(stcb, NULL);
4647                                 *offset = length;
4648                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4649                                 if (locked_tcb) {
4650                                         SCTP_TCB_UNLOCK(locked_tcb);
4651                                 }
4652                                 return (NULL);
4653                         }
4654                         if (netp) {
4655                                 sctp_handle_init(m, iphlen, *offset, sh,
4656                                     (struct sctp_init_chunk *)ch, inp,
4657                                     stcb, &abort_no_unlock, vrf_id, port);
4658                         }
4659                         if (abort_no_unlock)
4660                                 return (NULL);
4661
4662                         *offset = length;
4663                         if (locked_tcb) {
4664                                 SCTP_TCB_UNLOCK(locked_tcb);
4665                         }
4666                         return (NULL);
4667                         break;
4668                 case SCTP_PAD_CHUNK:
4669                         break;
4670                 case SCTP_INITIATION_ACK:
4671                         /* must be first and only chunk */
4672                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4673                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4674                                 /* We are not interested anymore */
4675                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4676                                         ;
4677                                 } else {
4678                                         if (locked_tcb != stcb) {
4679                                                 /* Very unlikely */
4680                                                 SCTP_TCB_UNLOCK(locked_tcb);
4681                                         }
4682                                         *offset = length;
4683                                         if (stcb) {
4684 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4685                                                 so = SCTP_INP_SO(inp);
4686                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4687                                                 SCTP_TCB_UNLOCK(stcb);
4688                                                 SCTP_SOCKET_LOCK(so, 1);
4689                                                 SCTP_TCB_LOCK(stcb);
4690                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4691 #endif
4692                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4693 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4694                                                 SCTP_SOCKET_UNLOCK(so, 1);
4695 #endif
4696                                         }
4697                                         return (NULL);
4698                                 }
4699                         }
4700                         if ((num_chunks > 1) ||
4701                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4702                                 *offset = length;
4703                                 if (locked_tcb) {
4704                                         SCTP_TCB_UNLOCK(locked_tcb);
4705                                 }
4706                                 return (NULL);
4707                         }
4708                         if ((netp) && (*netp)) {
4709                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4710                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4711                         } else {
4712                                 ret = -1;
4713                         }
4714                         /*
4715                          * Special case, I must call the output routine to
4716                          * get the cookie echoed
4717                          */
4718                         if (abort_no_unlock)
4719                                 return (NULL);
4720
4721                         if ((stcb) && ret == 0)
4722                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4723                         *offset = length;
4724                         if (locked_tcb) {
4725                                 SCTP_TCB_UNLOCK(locked_tcb);
4726                         }
4727                         return (NULL);
4728                         break;
4729                 case SCTP_SELECTIVE_ACK:
4730                         {
4731                                 struct sctp_sack_chunk *sack;
4732                                 int abort_now = 0;
4733                                 uint32_t a_rwnd, cum_ack;
4734                                 uint16_t num_seg, num_dup;
4735                                 uint8_t flags;
4736                                 int offset_seg, offset_dup;
4737
4738                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4739                                 SCTP_STAT_INCR(sctps_recvsacks);
4740                                 if (stcb == NULL) {
4741                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4742                                         break;
4743                                 }
4744                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4745                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4746                                         break;
4747                                 }
4748                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4749                                         /*-
4750                                          * If we have sent a shutdown-ack, we will pay no
4751                                          * attention to a sack sent in to us since
4752                                          * we don't care anymore.
4753                                          */
4754                                         break;
4755                                 }
4756                                 sack = (struct sctp_sack_chunk *)ch;
4757                                 flags = ch->chunk_flags;
4758                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4759                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4760                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4761                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4762                                 if (sizeof(struct sctp_sack_chunk) +
4763                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4764                                     num_dup * sizeof(uint32_t) != chk_length) {
4765                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4766                                         break;
4767                                 }
4768                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4769                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4770                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4771                                     cum_ack, num_seg, a_rwnd);
4772                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4773                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4774                                     (num_seg == 0) &&
4775                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4776                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4777                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4778                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4779                                     ) {
4780                                         /*
4781                                          * We have a SIMPLE sack having no
4782                                          * prior segments and data on sent
4783                                          * queue to be acked.. Use the
4784                                          * faster path sack processing. We
4785                                          * also allow window update sacks
4786                                          * with no missing segments to go
4787                                          * this way too.
4788                                          */
4789                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4790                                 } else {
4791                                         if (netp && *netp)
4792                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4793                                                     num_seg, 0, num_dup, &abort_now, flags,
4794                                                     cum_ack, a_rwnd, ecne_seen);
4795                                 }
4796                                 if (abort_now) {
4797                                         /* ABORT signal from sack processing */
4798                                         *offset = length;
4799                                         return (NULL);
4800                                 }
4801                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4802                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4803                                     (stcb->asoc.stream_queue_cnt == 0)) {
4804                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4805                                 }
4806                         }
4807                         break;
4808                         /*
4809                          * EY - nr_sack:  If the received chunk is an
4810                          * nr_sack chunk
4811                          */
4812                 case SCTP_NR_SELECTIVE_ACK:
4813                         {
4814                                 struct sctp_nr_sack_chunk *nr_sack;
4815                                 int abort_now = 0;
4816                                 uint32_t a_rwnd, cum_ack;
4817                                 uint16_t num_seg, num_nr_seg, num_dup;
4818                                 uint8_t flags;
4819                                 int offset_seg, offset_dup;
4820
4821                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4822                                 SCTP_STAT_INCR(sctps_recvsacks);
4823                                 if (stcb == NULL) {
4824                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4825                                         break;
4826                                 }
4827                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4828                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4829                                         goto unknown_chunk;
4830                                 }
4831                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4832                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4833                                         break;
4834                                 }
4835                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4836                                         /*-
4837                                          * If we have sent a shutdown-ack, we will pay no
4838                                          * attention to a sack sent in to us since
4839                                          * we don't care anymore.
4840                                          */
4841                                         break;
4842                                 }
4843                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4844                                 flags = ch->chunk_flags;
4845                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4846                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4847                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4848                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4849                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4850                                 if (sizeof(struct sctp_nr_sack_chunk) +
4851                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4852                                     num_dup * sizeof(uint32_t) != chk_length) {
4853                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4854                                         break;
4855                                 }
4856                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4857                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4858                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4859                                     cum_ack, num_seg, a_rwnd);
4860                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4861                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4862                                     (num_seg == 0) && (num_nr_seg == 0) &&
4863                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4864                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4865                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4866                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4867                                         /*
4868                                          * We have a SIMPLE sack having no
4869                                          * prior segments and data on sent
4870                                          * queue to be acked. Use the faster
4871                                          * path sack processing. We also
4872                                          * allow window update sacks with no
4873                                          * missing segments to go this way
4874                                          * too.
4875                                          */
4876                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4877                                             &abort_now, ecne_seen);
4878                                 } else {
4879                                         if (netp && *netp)
4880                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4881                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4882                                                     cum_ack, a_rwnd, ecne_seen);
4883                                 }
4884                                 if (abort_now) {
4885                                         /* ABORT signal from sack processing */
4886                                         *offset = length;
4887                                         return (NULL);
4888                                 }
4889                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4890                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4891                                     (stcb->asoc.stream_queue_cnt == 0)) {
4892                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4893                                 }
4894                         }
4895                         break;
4896
4897                 case SCTP_HEARTBEAT_REQUEST:
4898                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4899                         if ((stcb) && netp && *netp) {
4900                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4901                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4902                                     chk_length, *netp);
4903
4904                                 /* He's alive so give him credit */
4905                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4906                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4907                                             stcb->asoc.overall_error_count,
4908                                             0,
4909                                             SCTP_FROM_SCTP_INPUT,
4910                                             __LINE__);
4911                                 }
4912                                 stcb->asoc.overall_error_count = 0;
4913                         }
4914                         break;
4915                 case SCTP_HEARTBEAT_ACK:
4916                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4917                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4918                                 /* Its not ours */
4919                                 *offset = length;
4920                                 if (locked_tcb) {
4921                                         SCTP_TCB_UNLOCK(locked_tcb);
4922                                 }
4923                                 return (NULL);
4924                         }
4925                         /* He's alive so give him credit */
4926                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4927                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4928                                     stcb->asoc.overall_error_count,
4929                                     0,
4930                                     SCTP_FROM_SCTP_INPUT,
4931                                     __LINE__);
4932                         }
4933                         stcb->asoc.overall_error_count = 0;
4934                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4935                         if (netp && *netp)
4936                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4937                                     stcb, *netp);
4938                         break;
4939                 case SCTP_ABORT_ASSOCIATION:
4940                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4941                             stcb);
4942                         if ((stcb) && netp && *netp)
4943                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4944                                     stcb, *netp);
4945                         *offset = length;
4946                         return (NULL);
4947                         break;
4948                 case SCTP_SHUTDOWN:
4949                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4950                             stcb);
4951                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4952                                 *offset = length;
4953                                 if (locked_tcb) {
4954                                         SCTP_TCB_UNLOCK(locked_tcb);
4955                                 }
4956                                 return (NULL);
4957                         }
4958                         if (netp && *netp) {
4959                                 int abort_flag = 0;
4960
4961                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4962                                     stcb, *netp, &abort_flag);
4963                                 if (abort_flag) {
4964                                         *offset = length;
4965                                         return (NULL);
4966                                 }
4967                         }
4968                         break;
4969                 case SCTP_SHUTDOWN_ACK:
4970                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4971                         if ((stcb) && (netp) && (*netp))
4972                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4973                         *offset = length;
4974                         return (NULL);
4975                         break;
4976
4977                 case SCTP_OPERATION_ERROR:
4978                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4979                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4980
4981                                 *offset = length;
4982                                 return (NULL);
4983                         }
4984                         break;
4985                 case SCTP_COOKIE_ECHO:
4986                         SCTPDBG(SCTP_DEBUG_INPUT3,
4987                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4988                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4989                                 ;
4990                         } else {
4991                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4992                                         /* We are not interested anymore */
4993                         abend:
4994                                         if (stcb) {
4995                                                 SCTP_TCB_UNLOCK(stcb);
4996                                         }
4997                                         *offset = length;
4998                                         return (NULL);
4999                                 }
5000                         }
5001                         /*
5002                          * First are we accepting? We do this again here
5003                          * since it is possible that a previous endpoint WAS
5004                          * listening responded to a INIT-ACK and then
5005                          * closed. We opened and bound.. and are now no
5006                          * longer listening.
5007                          */
5008
5009                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5010                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5011                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5012                                         struct mbuf *oper;
5013                                         struct sctp_paramhdr *phdr;
5014
5015                                         oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5016                                             0, M_DONTWAIT, 1, MT_DATA);
5017                                         if (oper) {
5018                                                 SCTP_BUF_LEN(oper) =
5019                                                     sizeof(struct sctp_paramhdr);
5020                                                 phdr = mtod(oper,
5021                                                     struct sctp_paramhdr *);
5022                                                 phdr->param_type =
5023                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
5024                                                 phdr->param_length =
5025                                                     htons(sizeof(struct sctp_paramhdr));
5026                                         }
5027                                         sctp_abort_association(inp, stcb, m,
5028                                             iphlen, sh, oper, vrf_id, port);
5029                                 }
5030                                 *offset = length;
5031                                 return (NULL);
5032                         } else {
5033                                 struct mbuf *ret_buf;
5034                                 struct sctp_inpcb *linp;
5035
5036                                 if (stcb) {
5037                                         linp = NULL;
5038                                 } else {
5039                                         linp = inp;
5040                                 }
5041
5042                                 if (linp) {
5043                                         SCTP_ASOC_CREATE_LOCK(linp);
5044                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5045                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5046                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5047                                                 goto abend;
5048                                         }
5049                                 }
5050                                 if (netp) {
5051                                         ret_buf =
5052                                             sctp_handle_cookie_echo(m, iphlen,
5053                                             *offset, sh,
5054                                             (struct sctp_cookie_echo_chunk *)ch,
5055                                             &inp, &stcb, netp,
5056                                             auth_skipped,
5057                                             auth_offset,
5058                                             auth_len,
5059                                             &locked_tcb,
5060                                             vrf_id,
5061                                             port);
5062                                 } else {
5063                                         ret_buf = NULL;
5064                                 }
5065                                 if (linp) {
5066                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5067                                 }
5068                                 if (ret_buf == NULL) {
5069                                         if (locked_tcb) {
5070                                                 SCTP_TCB_UNLOCK(locked_tcb);
5071                                         }
5072                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5073                                             "GAK, null buffer\n");
5074                                         *offset = length;
5075                                         return (NULL);
5076                                 }
5077                                 /* if AUTH skipped, see if it verified... */
5078                                 if (auth_skipped) {
5079                                         got_auth = 1;
5080                                         auth_skipped = 0;
5081                                 }
5082                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5083                                         /*
5084                                          * Restart the timer if we have
5085                                          * pending data
5086                                          */
5087                                         struct sctp_tmit_chunk *chk;
5088
5089                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5090                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5091                                 }
5092                         }
5093                         break;
5094                 case SCTP_COOKIE_ACK:
5095                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5096                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5097                                 if (locked_tcb) {
5098                                         SCTP_TCB_UNLOCK(locked_tcb);
5099                                 }
5100                                 return (NULL);
5101                         }
5102                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5103                                 /* We are not interested anymore */
5104                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5105                                         ;
5106                                 } else if (stcb) {
5107 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5108                                         so = SCTP_INP_SO(inp);
5109                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5110                                         SCTP_TCB_UNLOCK(stcb);
5111                                         SCTP_SOCKET_LOCK(so, 1);
5112                                         SCTP_TCB_LOCK(stcb);
5113                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5114 #endif
5115                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5116 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5117                                         SCTP_SOCKET_UNLOCK(so, 1);
5118 #endif
5119                                         *offset = length;
5120                                         return (NULL);
5121                                 }
5122                         }
5123                         /* He's alive so give him credit */
5124                         if ((stcb) && netp && *netp) {
5125                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5126                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5127                                             stcb->asoc.overall_error_count,
5128                                             0,
5129                                             SCTP_FROM_SCTP_INPUT,
5130                                             __LINE__);
5131                                 }
5132                                 stcb->asoc.overall_error_count = 0;
5133                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5134                         }
5135                         break;
5136                 case SCTP_ECN_ECHO:
5137                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5138                         /* He's alive so give him credit */
5139                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5140                                 /* Its not ours */
5141                                 if (locked_tcb) {
5142                                         SCTP_TCB_UNLOCK(locked_tcb);
5143                                 }
5144                                 *offset = length;
5145                                 return (NULL);
5146                         }
5147                         if (stcb) {
5148                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5149                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5150                                             stcb->asoc.overall_error_count,
5151                                             0,
5152                                             SCTP_FROM_SCTP_INPUT,
5153                                             __LINE__);
5154                                 }
5155                                 stcb->asoc.overall_error_count = 0;
5156                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5157                                     stcb);
5158                                 ecne_seen = 1;
5159                         }
5160                         break;
5161                 case SCTP_ECN_CWR:
5162                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5163                         /* He's alive so give him credit */
5164                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5165                                 /* Its not ours */
5166                                 if (locked_tcb) {
5167                                         SCTP_TCB_UNLOCK(locked_tcb);
5168                                 }
5169                                 *offset = length;
5170                                 return (NULL);
5171                         }
5172                         if (stcb) {
5173                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5174                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5175                                             stcb->asoc.overall_error_count,
5176                                             0,
5177                                             SCTP_FROM_SCTP_INPUT,
5178                                             __LINE__);
5179                                 }
5180                                 stcb->asoc.overall_error_count = 0;
5181                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5182                         }
5183                         break;
5184                 case SCTP_SHUTDOWN_COMPLETE:
5185                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5186                         /* must be first and only chunk */
5187                         if ((num_chunks > 1) ||
5188                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5189                                 *offset = length;
5190                                 if (locked_tcb) {
5191                                         SCTP_TCB_UNLOCK(locked_tcb);
5192                                 }
5193                                 return (NULL);
5194                         }
5195                         if ((stcb) && netp && *netp) {
5196                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5197                                     stcb, *netp);
5198                         }
5199                         *offset = length;
5200                         return (NULL);
5201                         break;
5202                 case SCTP_ASCONF:
5203                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5204                         /* He's alive so give him credit */
5205                         if (stcb) {
5206                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5207                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5208                                             stcb->asoc.overall_error_count,
5209                                             0,
5210                                             SCTP_FROM_SCTP_INPUT,
5211                                             __LINE__);
5212                                 }
5213                                 stcb->asoc.overall_error_count = 0;
5214                                 sctp_handle_asconf(m, *offset,
5215                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5216                                 asconf_cnt++;
5217                         }
5218                         break;
5219                 case SCTP_ASCONF_ACK:
5220                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5221                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5222                                 /* Its not ours */
5223                                 if (locked_tcb) {
5224                                         SCTP_TCB_UNLOCK(locked_tcb);
5225                                 }
5226                                 *offset = length;
5227                                 return (NULL);
5228                         }
5229                         if ((stcb) && netp && *netp) {
5230                                 /* He's alive so give him credit */
5231                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5232                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5233                                             stcb->asoc.overall_error_count,
5234                                             0,
5235                                             SCTP_FROM_SCTP_INPUT,
5236                                             __LINE__);
5237                                 }
5238                                 stcb->asoc.overall_error_count = 0;
5239                                 sctp_handle_asconf_ack(m, *offset,
5240                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5241                                 if (abort_no_unlock)
5242                                         return (NULL);
5243                         }
5244                         break;
5245                 case SCTP_FORWARD_CUM_TSN:
5246                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5247                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5248                                 /* Its not ours */
5249                                 if (locked_tcb) {
5250                                         SCTP_TCB_UNLOCK(locked_tcb);
5251                                 }
5252                                 *offset = length;
5253                                 return (NULL);
5254                         }
5255                         /* He's alive so give him credit */
5256                         if (stcb) {
5257                                 int abort_flag = 0;
5258
5259                                 stcb->asoc.overall_error_count = 0;
5260                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5261                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5262                                             stcb->asoc.overall_error_count,
5263                                             0,
5264                                             SCTP_FROM_SCTP_INPUT,
5265                                             __LINE__);
5266                                 }
5267                                 *fwd_tsn_seen = 1;
5268                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5269                                         /* We are not interested anymore */
5270 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5271                                         so = SCTP_INP_SO(inp);
5272                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5273                                         SCTP_TCB_UNLOCK(stcb);
5274                                         SCTP_SOCKET_LOCK(so, 1);
5275                                         SCTP_TCB_LOCK(stcb);
5276                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5277 #endif
5278                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5279 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5280                                         SCTP_SOCKET_UNLOCK(so, 1);
5281 #endif
5282                                         *offset = length;
5283                                         return (NULL);
5284                                 }
5285                                 sctp_handle_forward_tsn(stcb,
5286                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5287                                 if (abort_flag) {
5288                                         *offset = length;
5289                                         return (NULL);
5290                                 } else {
5291                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5292                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5293                                                     stcb->asoc.overall_error_count,
5294                                                     0,
5295                                                     SCTP_FROM_SCTP_INPUT,
5296                                                     __LINE__);
5297                                         }
5298                                         stcb->asoc.overall_error_count = 0;
5299                                 }
5300
5301                         }
5302                         break;
5303                 case SCTP_STREAM_RESET:
5304                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5305                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5306                                 /* Its not ours */
5307                                 if (locked_tcb) {
5308                                         SCTP_TCB_UNLOCK(locked_tcb);
5309                                 }
5310                                 *offset = length;
5311                                 return (NULL);
5312                         }
5313                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5314                                 /* We are not interested anymore */
5315 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5316                                 so = SCTP_INP_SO(inp);
5317                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5318                                 SCTP_TCB_UNLOCK(stcb);
5319                                 SCTP_SOCKET_LOCK(so, 1);
5320                                 SCTP_TCB_LOCK(stcb);
5321                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5322 #endif
5323                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5324 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5325                                 SCTP_SOCKET_UNLOCK(so, 1);
5326 #endif
5327                                 *offset = length;
5328                                 return (NULL);
5329                         }
5330                         if (stcb->asoc.peer_supports_strreset == 0) {
5331                                 /*
5332                                  * hmm, peer should have announced this, but
5333                                  * we will turn it on since he is sending us
5334                                  * a stream reset.
5335                                  */
5336                                 stcb->asoc.peer_supports_strreset = 1;
5337                         }
5338                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5339                                 /* stop processing */
5340                                 *offset = length;
5341                                 return (NULL);
5342                         }
5343                         break;
5344                 case SCTP_PACKET_DROPPED:
5345                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5346                         /* re-get it all please */
5347                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5348                                 /* Its not ours */
5349                                 if (locked_tcb) {
5350                                         SCTP_TCB_UNLOCK(locked_tcb);
5351                                 }
5352                                 *offset = length;
5353                                 return (NULL);
5354                         }
5355                         if (ch && (stcb) && netp && (*netp)) {
5356                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5357                                     stcb, *netp,
5358                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5359
5360                         }
5361                         break;
5362
5363                 case SCTP_AUTHENTICATION:
5364                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5365                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5366                                 goto unknown_chunk;
5367
5368                         if (stcb == NULL) {
5369                                 /* save the first AUTH for later processing */
5370                                 if (auth_skipped == 0) {
5371                                         auth_offset = *offset;
5372                                         auth_len = chk_length;
5373                                         auth_skipped = 1;
5374                                 }
5375                                 /* skip this chunk (temporarily) */
5376                                 goto next_chunk;
5377                         }
5378                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5379                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5380                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5381                                 /* Its not ours */
5382                                 if (locked_tcb) {
5383                                         SCTP_TCB_UNLOCK(locked_tcb);
5384                                 }
5385                                 *offset = length;
5386                                 return (NULL);
5387                         }
5388                         if (got_auth == 1) {
5389                                 /* skip this chunk... it's already auth'd */
5390                                 goto next_chunk;
5391                         }
5392                         got_auth = 1;
5393                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5394                             m, *offset)) {
5395                                 /* auth HMAC failed so dump the packet */
5396                                 *offset = length;
5397                                 return (stcb);
5398                         } else {
5399                                 /* remaining chunks are HMAC checked */
5400                                 stcb->asoc.authenticated = 1;
5401                         }
5402                         break;
5403
5404                 default:
5405         unknown_chunk:
5406                         /* it's an unknown chunk! */
5407                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5408                                 struct mbuf *mm;
5409                                 struct sctp_paramhdr *phd;
5410
5411                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5412                                     0, M_DONTWAIT, 1, MT_DATA);
5413                                 if (mm) {
5414                                         phd = mtod(mm, struct sctp_paramhdr *);
5415                                         /*
5416                                          * We cheat and use param type since
5417                                          * we did not bother to define a
5418                                          * error cause struct. They are the
5419                                          * same basic format with different
5420                                          * names.
5421                                          */
5422                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5423                                         phd->param_length = htons(chk_length + sizeof(*phd));
5424                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5425                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5426                                             M_DONTWAIT);
5427                                         if (SCTP_BUF_NEXT(mm)) {
5428 #ifdef SCTP_MBUF_LOGGING
5429                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5430                                                         struct mbuf *mat;
5431
5432                                                         mat = SCTP_BUF_NEXT(mm);
5433                                                         while (mat) {
5434                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5435                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5436                                                                 }
5437                                                                 mat = SCTP_BUF_NEXT(mat);
5438                                                         }
5439                                                 }
5440 #endif
5441                                                 sctp_queue_op_err(stcb, mm);
5442                                         } else {
5443                                                 sctp_m_freem(mm);
5444                                         }
5445                                 }
5446                         }
5447                         if ((ch->chunk_type & 0x80) == 0) {
5448                                 /* discard this packet */
5449                                 *offset = length;
5450                                 return (stcb);
5451                         }       /* else skip this bad chunk and continue... */
5452                         break;
5453                 }               /* switch (ch->chunk_type) */
5454
5455
5456 next_chunk:
5457                 /* get the next chunk */
5458                 *offset += SCTP_SIZE32(chk_length);
5459                 if (*offset >= length) {
5460                         /* no more data left in the mbuf chain */
5461                         break;
5462                 }
5463                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5464                     sizeof(struct sctp_chunkhdr), chunk_buf);
5465                 if (ch == NULL) {
5466                         if (locked_tcb) {
5467                                 SCTP_TCB_UNLOCK(locked_tcb);
5468                         }
5469                         *offset = length;
5470                         return (NULL);
5471                 }
5472         }                       /* while */
5473
5474         if (asconf_cnt > 0 && stcb != NULL) {
5475                 sctp_send_asconf_ack(stcb);
5476         }
5477         return (stcb);
5478 }
5479
5480
5481 #ifdef INVARIANTS
5482 #ifdef __GNUC__
5483 __attribute__((noinline))
5484 #endif
5485         void
5486              sctp_validate_no_locks(struct sctp_inpcb *inp)
5487 {
5488         struct sctp_tcb *lstcb;
5489
5490         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5491                 if (mtx_owned(&lstcb->tcb_mtx)) {
5492                         panic("Own lock on stcb at return from input");
5493                 }
5494         }
5495         if (mtx_owned(&inp->inp_create_mtx)) {
5496                 panic("Own create lock on inp");
5497         }
5498         if (mtx_owned(&inp->inp_mtx)) {
5499                 panic("Own inp lock on inp");
5500         }
5501 }
5502
5503 #endif
5504
5505 /*
5506  * common input chunk processing (v4 and v6)
5507  */
5508 void
5509 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5510     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5511     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5512     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5513 {
5514         /*
5515          * Control chunk processing
5516          */
5517         uint32_t high_tsn;
5518         int fwd_tsn_seen = 0, data_processed = 0;
5519         struct mbuf *m = *mm;
5520         int un_sent;
5521         int cnt_ctrl_ready = 0;
5522
5523         SCTP_STAT_INCR(sctps_recvdatagrams);
5524 #ifdef SCTP_AUDITING_ENABLED
5525         sctp_audit_log(0xE0, 1);
5526         sctp_auditing(0, inp, stcb, net);
5527 #endif
5528
5529         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5530             m, iphlen, offset, length, stcb);
5531         if (stcb) {
5532                 /* always clear this before beginning a packet */
5533                 stcb->asoc.authenticated = 0;
5534                 stcb->asoc.seen_a_sack_this_pkt = 0;
5535                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5536                     stcb, stcb->asoc.state);
5537
5538                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5539                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5540                         /*-
5541                          * If we hit here, we had a ref count
5542                          * up when the assoc was aborted and the
5543                          * timer is clearing out the assoc, we should
5544                          * NOT respond to any packet.. its OOTB.
5545                          */
5546                         SCTP_TCB_UNLOCK(stcb);
5547                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5548                             vrf_id, port);
5549                         goto out_now;
5550                 }
5551         }
5552         if (IS_SCTP_CONTROL(ch)) {
5553                 /* process the control portion of the SCTP packet */
5554                 /* sa_ignore NO_NULL_CHK */
5555                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5556                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5557                 if (stcb) {
5558                         /*
5559                          * This covers us if the cookie-echo was there and
5560                          * it changes our INP.
5561                          */
5562                         inp = stcb->sctp_ep;
5563                         if ((net) && (port)) {
5564                                 if (net->port == 0) {
5565                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5566                                 }
5567                                 net->port = port;
5568                         }
5569                 }
5570         } else {
5571                 /*
5572                  * no control chunks, so pre-process DATA chunks (these
5573                  * checks are taken care of by control processing)
5574                  */
5575
5576                 /*
5577                  * if DATA only packet, and auth is required, then punt...
5578                  * can't have authenticated without any AUTH (control)
5579                  * chunks
5580                  */
5581                 if ((stcb != NULL) &&
5582                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5583                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5584                         /* "silently" ignore */
5585                         SCTP_STAT_INCR(sctps_recvauthmissing);
5586                         SCTP_TCB_UNLOCK(stcb);
5587                         goto out_now;
5588                 }
5589                 if (stcb == NULL) {
5590                         /* out of the blue DATA chunk */
5591                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5592                             vrf_id, port);
5593                         goto out_now;
5594                 }
5595                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5596                         /* v_tag mismatch! */
5597                         SCTP_STAT_INCR(sctps_badvtag);
5598                         SCTP_TCB_UNLOCK(stcb);
5599                         goto out_now;
5600                 }
5601         }
5602
5603         if (stcb == NULL) {
5604                 /*
5605                  * no valid TCB for this packet, or we found it's a bad
5606                  * packet while processing control, or we're done with this
5607                  * packet (done or skip rest of data), so we drop it...
5608                  */
5609                 goto out_now;
5610         }
5611         /*
5612          * DATA chunk processing
5613          */
5614         /* plow through the data chunks while length > offset */
5615
5616         /*
5617          * Rest should be DATA only.  Check authentication state if AUTH for
5618          * DATA is required.
5619          */
5620         if ((length > offset) &&
5621             (stcb != NULL) &&
5622             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5623             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5624             !stcb->asoc.authenticated) {
5625                 /* "silently" ignore */
5626                 SCTP_STAT_INCR(sctps_recvauthmissing);
5627                 SCTPDBG(SCTP_DEBUG_AUTH1,
5628                     "Data chunk requires AUTH, skipped\n");
5629                 goto trigger_send;
5630         }
5631         if (length > offset) {
5632                 int retval;
5633
5634                 /*
5635                  * First check to make sure our state is correct. We would
5636                  * not get here unless we really did have a tag, so we don't
5637                  * abort if this happens, just dump the chunk silently.
5638                  */
5639                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5640                 case SCTP_STATE_COOKIE_ECHOED:
5641                         /*
5642                          * we consider data with valid tags in this state
5643                          * shows us the cookie-ack was lost. Imply it was
5644                          * there.
5645                          */
5646                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5647                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5648                                     stcb->asoc.overall_error_count,
5649                                     0,
5650                                     SCTP_FROM_SCTP_INPUT,
5651                                     __LINE__);
5652                         }
5653                         stcb->asoc.overall_error_count = 0;
5654                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5655                         break;
5656                 case SCTP_STATE_COOKIE_WAIT:
5657                         /*
5658                          * We consider OOTB any data sent during asoc setup.
5659                          */
5660                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5661                             vrf_id, port);
5662                         SCTP_TCB_UNLOCK(stcb);
5663                         goto out_now;
5664                         /* sa_ignore NOTREACHED */
5665                         break;
5666                 case SCTP_STATE_EMPTY:  /* should not happen */
5667                 case SCTP_STATE_INUSE:  /* should not happen */
5668                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5669                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5670                 default:
5671                         SCTP_TCB_UNLOCK(stcb);
5672                         goto out_now;
5673                         /* sa_ignore NOTREACHED */
5674                         break;
5675                 case SCTP_STATE_OPEN:
5676                 case SCTP_STATE_SHUTDOWN_SENT:
5677                         break;
5678                 }
5679                 /* plow through the data chunks while length > offset */
5680                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5681                     inp, stcb, net, &high_tsn);
5682                 if (retval == 2) {
5683                         /*
5684                          * The association aborted, NO UNLOCK needed since
5685                          * the association is destroyed.
5686                          */
5687                         goto out_now;
5688                 }
5689                 data_processed = 1;
5690                 /*
5691                  * Anything important needs to have been m_copy'ed in
5692                  * process_data
5693                  */
5694         }
5695         /* take care of ecn */
5696         if ((data_processed == 1) &&
5697             (stcb->asoc.ecn_allowed == 1) &&
5698             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5699                 /* Yep, we need to add a ECNE */
5700                 sctp_send_ecn_echo(stcb, net, high_tsn);
5701         }
5702         if ((data_processed == 0) && (fwd_tsn_seen)) {
5703                 int was_a_gap;
5704                 uint32_t highest_tsn;
5705
5706                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5707                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5708                 } else {
5709                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5710                 }
5711                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5712                 stcb->asoc.send_sack = 1;
5713                 sctp_sack_check(stcb, was_a_gap);
5714         } else if (fwd_tsn_seen) {
5715                 stcb->asoc.send_sack = 1;
5716         }
5717         /* trigger send of any chunks in queue... */
5718 trigger_send:
5719 #ifdef SCTP_AUDITING_ENABLED
5720         sctp_audit_log(0xE0, 2);
5721         sctp_auditing(1, inp, stcb, net);
5722 #endif
5723         SCTPDBG(SCTP_DEBUG_INPUT1,
5724             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5725             stcb->asoc.peers_rwnd,
5726             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5727             stcb->asoc.total_flight);
5728         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5729         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5730                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5731         }
5732         if (cnt_ctrl_ready ||
5733             ((un_sent) &&
5734             (stcb->asoc.peers_rwnd > 0 ||
5735             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5736                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5737                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5738                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5739         }
5740 #ifdef SCTP_AUDITING_ENABLED
5741         sctp_audit_log(0xE0, 3);
5742         sctp_auditing(2, inp, stcb, net);
5743 #endif
5744         SCTP_TCB_UNLOCK(stcb);
5745 out_now:
5746 #ifdef INVARIANTS
5747         sctp_validate_no_locks(inp);
5748 #endif
5749         return;
5750 }
5751
5752 #if 0
5753 static void
5754 sctp_print_mbuf_chain(struct mbuf *m)
5755 {
5756         for (; m; m = SCTP_BUF_NEXT(m)) {
5757                 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5758                 if (SCTP_BUF_IS_EXTENDED(m))
5759                         printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5760         }
5761 }
5762
5763 #endif
5764
5765 #ifdef INET
5766 void
5767 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5768 {
5769 #ifdef SCTP_MBUF_LOGGING
5770         struct mbuf *mat;
5771
5772 #endif
5773         struct mbuf *m;
5774         int iphlen;
5775         uint32_t vrf_id = 0;
5776         uint8_t ecn_bits;
5777         struct ip *ip;
5778         struct sctphdr *sh;
5779         struct sctp_inpcb *inp = NULL;
5780         struct sctp_nets *net;
5781         struct sctp_tcb *stcb = NULL;
5782         struct sctp_chunkhdr *ch;
5783         int refcount_up = 0;
5784         int length, mlen, offset;
5785
5786 #if !defined(SCTP_WITH_NO_CSUM)
5787         uint32_t check, calc_check;
5788
5789 #endif
5790
5791         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5792                 SCTP_RELEASE_PKT(i_pak);
5793                 return;
5794         }
5795         mlen = SCTP_HEADER_LEN(i_pak);
5796         iphlen = off;
5797         m = SCTP_HEADER_TO_CHAIN(i_pak);
5798
5799         net = NULL;
5800         SCTP_STAT_INCR(sctps_recvpackets);
5801         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5802
5803
5804 #ifdef SCTP_MBUF_LOGGING
5805         /* Log in any input mbufs */
5806         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5807                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
5808                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5809                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5810                         }
5811                 }
5812         }
5813 #endif
5814 #ifdef  SCTP_PACKET_LOGGING
5815         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5816                 sctp_packet_log(m, mlen);
5817 #endif
5818         /*
5819          * Must take out the iphlen, since mlen expects this (only effect lb
5820          * case)
5821          */
5822         mlen -= iphlen;
5823
5824         /*
5825          * Get IP, SCTP, and first chunk header together in first mbuf.
5826          */
5827         ip = mtod(m, struct ip *);
5828         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5829         if (SCTP_BUF_LEN(m) < offset) {
5830                 if ((m = m_pullup(m, offset)) == 0) {
5831                         SCTP_STAT_INCR(sctps_hdrops);
5832                         return;
5833                 }
5834                 ip = mtod(m, struct ip *);
5835         }
5836         /* validate mbuf chain length with IP payload length */
5837         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5838                 SCTP_STAT_INCR(sctps_hdrops);
5839                 goto bad;
5840         }
5841         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5842         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5843         SCTPDBG(SCTP_DEBUG_INPUT1,
5844             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5845
5846         /* SCTP does not allow broadcasts or multicasts */
5847         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5848                 goto bad;
5849         }
5850         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5851                 /*
5852                  * We only look at broadcast if its a front state, All
5853                  * others we will not have a tcb for anyway.
5854                  */
5855                 goto bad;
5856         }
5857         /* validate SCTP checksum */
5858         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5859             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5860             m->m_pkthdr.len,
5861             if_name(m->m_pkthdr.rcvif),
5862             m->m_pkthdr.csum_flags);
5863 #if defined(SCTP_WITH_NO_CSUM)
5864         SCTP_STAT_INCR(sctps_recvnocrc);
5865 #else
5866         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5867                 SCTP_STAT_INCR(sctps_recvhwcrc);
5868                 goto sctp_skip_csum_4;
5869         }
5870         check = sh->checksum;   /* save incoming checksum */
5871         sh->checksum = 0;       /* prepare for calc */
5872         calc_check = sctp_calculate_cksum(m, iphlen);
5873         sh->checksum = check;
5874         SCTP_STAT_INCR(sctps_recvswcrc);
5875         if (calc_check != check) {
5876                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5877                     calc_check, check, m, mlen, iphlen);
5878
5879                 stcb = sctp_findassociation_addr(m,
5880                     offset - sizeof(*ch),
5881                     sh, ch, &inp, &net,
5882                     vrf_id);
5883                 if ((net) && (port)) {
5884                         if (net->port == 0) {
5885                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5886                         }
5887                         net->port = port;
5888                 }
5889                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5890                         net->flowid = m->m_pkthdr.flowid;
5891 #ifdef INVARIANTS
5892                         net->flowidset = 1;
5893 #endif
5894                 }
5895                 if ((inp) && (stcb)) {
5896                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5897                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5898                 } else if ((inp != NULL) && (stcb == NULL)) {
5899                         refcount_up = 1;
5900                 }
5901                 SCTP_STAT_INCR(sctps_badsum);
5902                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5903                 goto bad;
5904         }
5905 sctp_skip_csum_4:
5906 #endif
5907         /* destination port of 0 is illegal, based on RFC2960. */
5908         if (sh->dest_port == 0) {
5909                 SCTP_STAT_INCR(sctps_hdrops);
5910                 goto bad;
5911         }
5912         /*
5913          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5914          * IP/SCTP/first chunk header...
5915          */
5916         stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
5917             sh, ch, &inp, &net, vrf_id);
5918         if ((net) && (port)) {
5919                 if (net->port == 0) {
5920                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5921                 }
5922                 net->port = port;
5923         }
5924         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5925                 net->flowid = m->m_pkthdr.flowid;
5926 #ifdef INVARIANTS
5927                 net->flowidset = 1;
5928 #endif
5929         }
5930         /* inp's ref-count increased && stcb locked */
5931         if (inp == NULL) {
5932                 struct sctp_init_chunk *init_chk, chunk_buf;
5933
5934                 SCTP_STAT_INCR(sctps_noport);
5935 #ifdef ICMP_BANDLIM
5936                 /*
5937                  * we use the bandwidth limiting to protect against sending
5938                  * too many ABORTS all at once. In this case these count the
5939                  * same as an ICMP message.
5940                  */
5941                 if (badport_bandlim(0) < 0)
5942                         goto bad;
5943 #endif                          /* ICMP_BANDLIM */
5944                 SCTPDBG(SCTP_DEBUG_INPUT1,
5945                     "Sending a ABORT from packet entry!\n");
5946                 if (ch->chunk_type == SCTP_INITIATION) {
5947                         /*
5948                          * we do a trick here to get the INIT tag, dig in
5949                          * and get the tag from the INIT and put it in the
5950                          * common header.
5951                          */
5952                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5953                             iphlen + sizeof(*sh), sizeof(*init_chk),
5954                             (uint8_t *) & chunk_buf);
5955                         if (init_chk != NULL)
5956                                 sh->v_tag = init_chk->init.initiate_tag;
5957                 }
5958                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5959                         sctp_send_shutdown_complete2(m, sh, vrf_id, port);
5960                         goto bad;
5961                 }
5962                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5963                         goto bad;
5964                 }
5965                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5966                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5967                 goto bad;
5968         } else if (stcb == NULL) {
5969                 refcount_up = 1;
5970         }
5971 #ifdef IPSEC
5972         /*
5973          * I very much doubt any of the IPSEC stuff will work but I have no
5974          * idea, so I will leave it in place.
5975          */
5976         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5977                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5978                 SCTP_STAT_INCR(sctps_hdrops);
5979                 goto bad;
5980         }
5981 #endif                          /* IPSEC */
5982
5983         /*
5984          * common chunk processing
5985          */
5986         length = ip->ip_len + iphlen;
5987         offset -= sizeof(struct sctp_chunkhdr);
5988
5989         ecn_bits = ip->ip_tos;
5990
5991         /* sa_ignore NO_NULL_CHK */
5992         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
5993             inp, stcb, net, ecn_bits, vrf_id, port);
5994         /* inp's ref-count reduced && stcb unlocked */
5995         if (m) {
5996                 sctp_m_freem(m);
5997         }
5998         if ((inp) && (refcount_up)) {
5999                 /* reduce ref-count */
6000                 SCTP_INP_DECR_REF(inp);
6001         }
6002         return;
6003 bad:
6004         if (stcb) {
6005                 SCTP_TCB_UNLOCK(stcb);
6006         }
6007         if ((inp) && (refcount_up)) {
6008                 /* reduce ref-count */
6009                 SCTP_INP_DECR_REF(inp);
6010         }
6011         if (m) {
6012                 sctp_m_freem(m);
6013         }
6014         return;
6015 }
6016
6017 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6018 extern int *sctp_cpuarry;
6019
6020 #endif
6021
6022 void
6023 sctp_input(struct mbuf *m, int off)
6024 {
6025 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6026         struct ip *ip;
6027         struct sctphdr *sh;
6028         int offset;
6029         int cpu_to_use;
6030         uint32_t flowid, tag;
6031
6032         if (mp_ncpus > 1) {
6033                 if (m->m_flags & M_FLOWID) {
6034                         flowid = m->m_pkthdr.flowid;
6035                 } else {
6036                         /*
6037                          * No flow id built by lower layers fix it so we
6038                          * create one.
6039                          */
6040                         ip = mtod(m, struct ip *);
6041                         offset = off + sizeof(*sh);
6042                         if (SCTP_BUF_LEN(m) < offset) {
6043                                 if ((m = m_pullup(m, offset)) == 0) {
6044                                         SCTP_STAT_INCR(sctps_hdrops);
6045                                         return;
6046                                 }
6047                                 ip = mtod(m, struct ip *);
6048                         }
6049                         sh = (struct sctphdr *)((caddr_t)ip + off);
6050                         tag = htonl(sh->v_tag);
6051                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6052                         m->m_pkthdr.flowid = flowid;
6053                         m->m_flags |= M_FLOWID;
6054                 }
6055                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6056                 sctp_queue_to_mcore(m, off, cpu_to_use);
6057                 return;
6058         }
6059 #endif
6060         sctp_input_with_port(m, off, 0);
6061 }
6062
6063 #endif