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     struct sctp_nets *net, 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     struct sctp_nets *net)
 263 {
 264         struct sctp_init *init;
 265         struct sctp_association *asoc;
 266         struct sctp_nets *lnet;
 267         unsigned int i;
 268
 269         init = &cp->init;
 270         asoc = &stcb->asoc;
 271         /* save off parameters */
 272         asoc->peer_vtag = ntohl(init->initiate_tag);
 273         asoc->peers_rwnd = ntohl(init->a_rwnd);
 274         /* init tsn's */
 275         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 276
 277         if (!TAILQ_EMPTY(&asoc->nets)) {
 278                 /* update any ssthresh's that may have a default */
 279                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 280                         lnet->ssthresh = asoc->peers_rwnd;
 281                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 282                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 283                         }
 284                 }
 285         }
 286         SCTP_TCB_SEND_LOCK(stcb);
 287         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 288                 unsigned int newcnt;
 289                 struct sctp_stream_out *outs;
 290                 struct sctp_stream_queue_pending *sp, *nsp;
 291                 struct sctp_tmit_chunk *chk, *nchk;
 292
 293                 /* abandon the upper streams */
 294                 newcnt = ntohs(init->num_inbound_streams);
 295                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 296                         if (chk->rec.data.stream_number >= newcnt) {
 297                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 298                                 asoc->send_queue_cnt--;
 299                                 if (chk->data != NULL) {
 300                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 301                                         sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
 302                                             SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED);
 303                                         if (chk->data) {
 304                                                 sctp_m_freem(chk->data);
 305                                                 chk->data = NULL;
 306                                         }
 307                                 }
 308                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 309                                 /* sa_ignore FREED_MEMORY */
 310                         }
 311                 }
 312                 if (asoc->strmout) {
 313                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 314                                 outs = &asoc->strmout[i];
 315                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 316                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 317                                         asoc->stream_queue_cnt--;
 318                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 319                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
 320                                             sp, SCTP_SO_NOT_LOCKED);
 321                                         if (sp->data) {
 322                                                 sctp_m_freem(sp->data);
 323                                                 sp->data = NULL;
 324                                         }
 325                                         if (sp->net) {
 326                                                 sctp_free_remote_addr(sp->net);
 327                                                 sp->net = NULL;
 328                                         }
 329                                         /* Free the chunk */
 330                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 331                                         /* sa_ignore FREED_MEMORY */
 332                                 }
 333                         }
 334                 }
 335                 /* cut back the count */
 336                 asoc->pre_open_streams = newcnt;
 337         }
 338         SCTP_TCB_SEND_UNLOCK(stcb);
 339         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 340
 341         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 342         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 343         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 344                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 345         }
 346         /* This is the next one we expect */
 347         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 348
 349         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 350         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 351
 352         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 353         /* open the requested streams */
 354
 355         if (asoc->strmin != NULL) {
 356                 /* Free the old ones */
 357                 struct sctp_queued_to_read *ctl, *nctl;
 358
 359                 for (i = 0; i < asoc->streamincnt; i++) {
 360                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 361                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 362                                 sctp_free_remote_addr(ctl->whoFrom);
 363                                 ctl->whoFrom = NULL;
 364                                 sctp_m_freem(ctl->data);
 365                                 ctl->data = NULL;
 366                                 sctp_free_a_readq(stcb, ctl);
 367                         }
 368                 }
 369                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 370         }
 371         asoc->streamincnt = ntohs(init->num_outbound_streams);
 372         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 373                 asoc->streamincnt = MAX_SCTP_STREAMS;
 374         }
 375         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 376             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 377         if (asoc->strmin == NULL) {
 378                 /* we didn't get memory for the streams! */
 379                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 380                 return (-1);
 381         }
 382         for (i = 0; i < asoc->streamincnt; i++) {
 383                 asoc->strmin[i].stream_no = i;
 384                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 385                 /*
 386                  * U-stream ranges will be set when the cookie is unpacked.
 387                  * Or for the INIT sender they are un set (if pr-sctp not
 388                  * supported) when the INIT-ACK arrives.
 389                  */
 390                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 391                 asoc->strmin[i].delivery_started = 0;
 392         }
 393         /*
 394          * load_address_from_init will put the addresses into the
 395          * association when the COOKIE is processed or the INIT-ACK is
 396          * processed. Both types of COOKIE's existing and new call this
 397          * routine. It will remove addresses that are no longer in the
 398          * association (for the restarting case where addresses are
 399          * removed). Up front when the INIT arrives we will discard it if it
 400          * is a restart and new addresses have been added.
 401          */
 402         /* sa_ignore MEMLEAK */
 403         return (0);
 404 }
 405
 406 /*
 407  * INIT-ACK message processing/consumption returns value < 0 on error
 408  */
 409 static int
 410 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 411     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 412     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 413 {
 414         struct sctp_association *asoc;
 415         struct mbuf *op_err;
 416         int retval, abort_flag;
 417         uint32_t initack_limit;
 418         int nat_friendly = 0;
 419
 420         /* First verify that we have no illegal param's */
 421         abort_flag = 0;
 422         op_err = NULL;
 423
 424         op_err = sctp_arethere_unrecognized_parameters(m,
 425             (offset + sizeof(struct sctp_init_chunk)),
 426             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 427         if (abort_flag) {
 428                 /* Send an abort and notify peer */
 429                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
 430                 *abort_no_unlock = 1;
 431                 return (-1);
 432         }
 433         asoc = &stcb->asoc;
 434         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 435         /* process the peer's parameters in the INIT-ACK */
 436         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
 437         if (retval < 0) {
 438                 return (retval);
 439         }
 440         initack_limit = offset + ntohs(cp->ch.chunk_length);
 441         /* load all addresses */
 442         if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
 443             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 444             NULL))) {
 445                 /* Huh, we should abort */
 446                 SCTPDBG(SCTP_DEBUG_INPUT1,
 447                     "Load addresses from INIT causes an abort %d\n",
 448                     retval);
 449                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 450                     NULL, 0, net->port);
 451                 *abort_no_unlock = 1;
 452                 return (-1);
 453         }
 454         /* if the peer doesn't support asconf, flush the asconf queue */
 455         if (asoc->peer_supports_asconf == 0) {
 456                 struct sctp_asconf_addr *param, *nparam;
 457
 458                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 459                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 460                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 461                 }
 462         }
 463         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 464             stcb->asoc.local_hmacs);
 465         if (op_err) {
 466                 sctp_queue_op_err(stcb, op_err);
 467                 /* queuing will steal away the mbuf chain to the out queue */
 468                 op_err = NULL;
 469         }
 470         /* extract the cookie and queue it to "echo" it back... */
 471         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 472                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 473                     stcb->asoc.overall_error_count,
 474                     0,
 475                     SCTP_FROM_SCTP_INPUT,
 476                     __LINE__);
 477         }
 478         stcb->asoc.overall_error_count = 0;
 479         net->error_count = 0;
 480
 481         /*
 482          * Cancel the INIT timer, We do this first before queueing the
 483          * cookie. We always cancel at the primary to assue that we are
 484          * canceling the timer started by the INIT which always goes to the
 485          * primary.
 486          */
 487         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 488             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 489
 490         /* calculate the RTO */
 491         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 492             SCTP_RTT_FROM_NON_DATA);
 493
 494         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 495         if (retval < 0) {
 496                 /*
 497                  * No cookie, we probably should send a op error. But in any
 498                  * case if there is no cookie in the INIT-ACK, we can
 499                  * abandon the peer, its broke.
 500                  */
 501                 if (retval == -3) {
 502                         /* We abort with an error of missing mandatory param */
 503                         op_err =
 504                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 505                         if (op_err) {
 506                                 /*
 507                                  * Expand beyond to include the mandatory
 508                                  * param cookie
 509                                  */
 510                                 struct sctp_inv_mandatory_param *mp;
 511
 512                                 SCTP_BUF_LEN(op_err) =
 513                                     sizeof(struct sctp_inv_mandatory_param);
 514                                 mp = mtod(op_err,
 515                                     struct sctp_inv_mandatory_param *);
 516                                 /* Subtract the reserved param */
 517                                 mp->length =
 518                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 519                                 mp->num_param = htonl(1);
 520                                 mp->param = htons(SCTP_STATE_COOKIE);
 521                                 mp->resv = 0;
 522                         }
 523                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 524                             sh, op_err, 0, net->port);
 525                         *abort_no_unlock = 1;
 526                 }
 527                 return (retval);
 528         }
 529         return (0);
 530 }
 531
 532 static void
 533 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 534     struct sctp_tcb *stcb, struct sctp_nets *net)
 535 {
 536         struct sockaddr_storage store;
 537         struct sctp_nets *r_net, *f_net;
 538         struct timeval tv;
 539         int req_prim = 0;
 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_WAS_PRIMARY;
 603                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 604                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 605                         if (f_net != r_net) {
 606                                 /*
 607                                  * first one on the list is NOT the primary
 608                                  * sctp_cmpaddr() is much more efficent if
 609                                  * the primary is the first on the list,
 610                                  * make it so.
 611                                  */
 612                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 613                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 614                         }
 615                         req_prim = 1;
 616                 }
 617                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 618                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 619         }
 620         r_net->error_count = 0;
 621         r_net->hb_responded = 1;
 622         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 623         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 624         if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
 625                 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
 626                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 627                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 628                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
 629                 /* now was it the primary? if so restore */
 630                 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
 631                         (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net);
 632                 }
 633         }
 634         /*
 635          * JRS 5/14/07 - If CMT PF is on and the destination is in PF state,
 636          * set the destination to active state and set the cwnd to one or
 637          * two MTU's based on whether PF1 or PF2 is being used. If a T3
 638          * timer is running, for the destination, stop the timer because a
 639          * PF-heartbeat was received.
 640          */
 641         if ((stcb->asoc.sctp_cmt_on_off > 0) &&
 642             (stcb->asoc.sctp_cmt_pf > 0) &&
 643             ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
 644                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 645                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 646                             stcb, net,
 647                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 648                 }
 649                 net->dest_state &= ~SCTP_ADDR_PF;
 650                 net->cwnd = net->mtu * stcb->asoc.sctp_cmt_pf;
 651                 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n",
 652                     net, net->cwnd);
 653         }
 654         /* Now lets do a RTO with this */
 655         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 656             SCTP_RTT_FROM_NON_DATA);
 657         /* Mobility adaptation */
 658         if (req_prim) {
 659                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 660                     SCTP_MOBILITY_BASE) ||
 661                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 662                     SCTP_MOBILITY_FASTHANDOFF)) &&
 663                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 664                     SCTP_MOBILITY_PRIM_DELETED)) {
 665
 666                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 667                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 668                             SCTP_MOBILITY_FASTHANDOFF)) {
 669                                 sctp_assoc_immediate_retrans(stcb,
 670                                     stcb->asoc.primary_destination);
 671                         }
 672                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 673                             SCTP_MOBILITY_BASE)) {
 674                                 sctp_move_chunks_from_net(stcb,
 675                                     stcb->asoc.deleted_primary);
 676                         }
 677                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 678                             stcb->asoc.deleted_primary);
 679                 }
 680         }
 681 }
 682
 683 static int
 684 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 685 {
 686         /*
 687          * return 0 means we want you to proceed with the abort non-zero
 688          * means no abort processing
 689          */
 690         struct sctpasochead *head;
 691
 692         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 693                 /* generate a new vtag and send init */
 694                 LIST_REMOVE(stcb, sctp_asocs);
 695                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 696                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 697                 /*
 698                  * put it in the bucket in the vtag hash of assoc's for the
 699                  * system
 700                  */
 701                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 702                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 703                 return (1);
 704         }
 705         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 706                 /*
 707                  * treat like a case where the cookie expired i.e.: - dump
 708                  * current cookie. - generate a new vtag. - resend init.
 709                  */
 710                 /* generate a new vtag and send init */
 711                 LIST_REMOVE(stcb, sctp_asocs);
 712                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 713                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 714                 sctp_stop_all_cookie_timers(stcb);
 715                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 716                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 717                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 718                 /*
 719                  * put it in the bucket in the vtag hash of assoc's for the
 720                  * system
 721                  */
 722                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 723                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 724                 return (1);
 725         }
 726         return (0);
 727 }
 728
 729 static int
 730 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 731     struct sctp_nets *net)
 732 {
 733         /*
 734          * return 0 means we want you to proceed with the abort non-zero
 735          * means no abort processing
 736          */
 737         if (stcb->asoc.peer_supports_auth == 0) {
 738                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 739                 return (0);
 740         }
 741         sctp_asconf_send_nat_state_update(stcb, net);
 742         return (1);
 743 }
 744
 745
 746 static void
 747 sctp_handle_abort(struct sctp_abort_chunk *cp,
 748     struct sctp_tcb *stcb, struct sctp_nets *net)
 749 {
 750 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 751         struct socket *so;
 752
 753 #endif
 754         uint16_t len;
 755
 756         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 757         if (stcb == NULL)
 758                 return;
 759
 760         len = ntohs(cp->ch.chunk_length);
 761         if (len > sizeof(struct sctp_chunkhdr)) {
 762                 /*
 763                  * Need to check the cause codes for our two magic nat
 764                  * aborts which don't kill the assoc necessarily.
 765                  */
 766                 struct sctp_abort_chunk *cpnext;
 767                 struct sctp_missing_nat_state *natc;
 768                 uint16_t cause;
 769
 770                 cpnext = cp;
 771                 cpnext++;
 772                 natc = (struct sctp_missing_nat_state *)cpnext;
 773                 cause = ntohs(natc->cause);
 774                 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 775                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 776                             cp->ch.chunk_flags);
 777                         if (sctp_handle_nat_colliding_state(stcb)) {
 778                                 return;
 779                         }
 780                 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
 781                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 782                             cp->ch.chunk_flags);
 783                         if (sctp_handle_nat_missing_state(stcb, net)) {
 784                                 return;
 785                         }
 786                 }
 787         }
 788         /* stop any receive timers */
 789         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 790         /* notify user of the abort and clean up... */
 791         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 792         /* free the tcb */
 793 #if defined(SCTP_PANIC_ON_ABORT)
 794         printf("stcb:%p state:%d rport:%d net:%p\n",
 795             stcb, stcb->asoc.state, stcb->rport, net);
 796         if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 797                 panic("Received an ABORT");
 798         } else {
 799                 printf("No panic its in state %x closed\n", stcb->asoc.state);
 800         }
 801 #endif
 802         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 803         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 804             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 805                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 806         }
 807 #ifdef SCTP_ASOCLOG_OF_TSNS
 808         sctp_print_out_track_log(stcb);
 809 #endif
 810 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 811         so = SCTP_INP_SO(stcb->sctp_ep);
 812         atomic_add_int(&stcb->asoc.refcnt, 1);
 813         SCTP_TCB_UNLOCK(stcb);
 814         SCTP_SOCKET_LOCK(so, 1);
 815         SCTP_TCB_LOCK(stcb);
 816         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 817 #endif
 818         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 819         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 820             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 821 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 822         SCTP_SOCKET_UNLOCK(so, 1);
 823 #endif
 824         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 825 }
 826
 827 static void
 828 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 829     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 830 {
 831         struct sctp_association *asoc;
 832         int some_on_streamwheel;
 833
 834 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 835         struct socket *so;
 836
 837 #endif
 838
 839         SCTPDBG(SCTP_DEBUG_INPUT2,
 840             "sctp_handle_shutdown: handling SHUTDOWN\n");
 841         if (stcb == NULL)
 842                 return;
 843         asoc = &stcb->asoc;
 844         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 845             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 846                 return;
 847         }
 848         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 849                 /* Shutdown NOT the expected size */
 850                 return;
 851         } else {
 852                 sctp_update_acked(stcb, cp, net, abort_flag);
 853                 if (*abort_flag) {
 854                         return;
 855                 }
 856         }
 857         if (asoc->control_pdapi) {
 858                 /*
 859                  * With a normal shutdown we assume the end of last record.
 860                  */
 861                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 862                 asoc->control_pdapi->end_added = 1;
 863                 asoc->control_pdapi->pdapi_aborted = 1;
 864                 asoc->control_pdapi = NULL;
 865                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 866 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 867                 so = SCTP_INP_SO(stcb->sctp_ep);
 868                 atomic_add_int(&stcb->asoc.refcnt, 1);
 869                 SCTP_TCB_UNLOCK(stcb);
 870                 SCTP_SOCKET_LOCK(so, 1);
 871                 SCTP_TCB_LOCK(stcb);
 872                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 873                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 874                         /* assoc was freed while we were unlocked */
 875                         SCTP_SOCKET_UNLOCK(so, 1);
 876                         return;
 877                 }
 878 #endif
 879                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 880 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 881                 SCTP_SOCKET_UNLOCK(so, 1);
 882 #endif
 883         }
 884         /* goto SHUTDOWN_RECEIVED state to block new requests */
 885         if (stcb->sctp_socket) {
 886                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 887                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 888                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 889                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 890                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 891                         /*
 892                          * notify upper layer that peer has initiated a
 893                          * shutdown
 894                          */
 895                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 896
 897                         /* reset time */
 898                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 899                 }
 900         }
 901         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 902                 /*
 903                  * stop the shutdown timer, since we WILL move to
 904                  * SHUTDOWN-ACK-SENT.
 905                  */
 906                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 907         }
 908         /* Now is there unsent data on a stream somewhere? */
 909         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 910
 911         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 912             !TAILQ_EMPTY(&asoc->sent_queue) ||
 913             some_on_streamwheel) {
 914                 /* By returning we will push more data out */
 915                 return;
 916         } else {
 917                 /* no outstanding data to send, so move on... */
 918                 /* send SHUTDOWN-ACK */
 919                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 920                 /* move to SHUTDOWN-ACK-SENT state */
 921                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 922                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 923                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 924                 }
 925                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 926                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 927                 sctp_stop_timers_for_shutdown(stcb);
 928                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 929                     stcb, net);
 930         }
 931 }
 932
 933 static void
 934 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
 935     struct sctp_tcb *stcb,
 936     struct sctp_nets *net)
 937 {
 938         struct sctp_association *asoc;
 939
 940 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 941         struct socket *so;
 942
 943         so = SCTP_INP_SO(stcb->sctp_ep);
 944 #endif
 945         SCTPDBG(SCTP_DEBUG_INPUT2,
 946             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 947         if (stcb == NULL)
 948                 return;
 949
 950         asoc = &stcb->asoc;
 951         /* process according to association state */
 952         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 953             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 954                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 955                 sctp_send_shutdown_complete(stcb, net, 1);
 956                 SCTP_TCB_UNLOCK(stcb);
 957                 return;
 958         }
 959         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 960             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 961                 /* unexpected SHUTDOWN-ACK... so ignore... */
 962                 SCTP_TCB_UNLOCK(stcb);
 963                 return;
 964         }
 965         if (asoc->control_pdapi) {
 966                 /*
 967                  * With a normal shutdown we assume the end of last record.
 968                  */
 969                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 970                 asoc->control_pdapi->end_added = 1;
 971                 asoc->control_pdapi->pdapi_aborted = 1;
 972                 asoc->control_pdapi = NULL;
 973                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 974 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 975                 atomic_add_int(&stcb->asoc.refcnt, 1);
 976                 SCTP_TCB_UNLOCK(stcb);
 977                 SCTP_SOCKET_LOCK(so, 1);
 978                 SCTP_TCB_LOCK(stcb);
 979                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 980                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 981                         /* assoc was freed while we were unlocked */
 982                         SCTP_SOCKET_UNLOCK(so, 1);
 983                         return;
 984                 }
 985 #endif
 986                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 987 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 988                 SCTP_SOCKET_UNLOCK(so, 1);
 989 #endif
 990         }
 991         /* are the queues empty? */
 992         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 993             !TAILQ_EMPTY(&asoc->sent_queue) ||
 994             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 995                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
 996         }
 997         /* stop the timer */
 998         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 999         /* send SHUTDOWN-COMPLETE */
1000         sctp_send_shutdown_complete(stcb, net, 0);
1001         /* notify upper layer protocol */
1002         if (stcb->sctp_socket) {
1003                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1004                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1005                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1006                         /* Set the connected flag to disconnected */
1007                         stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
1008                 }
1009         }
1010         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1011         /* free the TCB but first save off the ep */
1012 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1013         atomic_add_int(&stcb->asoc.refcnt, 1);
1014         SCTP_TCB_UNLOCK(stcb);
1015         SCTP_SOCKET_LOCK(so, 1);
1016         SCTP_TCB_LOCK(stcb);
1017         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1018 #endif
1019         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1020             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1021 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1022         SCTP_SOCKET_UNLOCK(so, 1);
1023 #endif
1024 }
1025
1026 /*
1027  * Skip past the param header and then we will find the chunk that caused the
1028  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1029  * our peer must be broken.
1030  */
1031 static void
1032 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1033     struct sctp_nets *net)
1034 {
1035         struct sctp_chunkhdr *chk;
1036
1037         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1038         switch (chk->chunk_type) {
1039         case SCTP_ASCONF_ACK:
1040         case SCTP_ASCONF:
1041                 sctp_asconf_cleanup(stcb, net);
1042                 break;
1043         case SCTP_FORWARD_CUM_TSN:
1044                 stcb->asoc.peer_supports_prsctp = 0;
1045                 break;
1046         default:
1047                 SCTPDBG(SCTP_DEBUG_INPUT2,
1048                     "Peer does not support chunk type %d(%x)??\n",
1049                     chk->chunk_type, (uint32_t) chk->chunk_type);
1050                 break;
1051         }
1052 }
1053
1054 /*
1055  * Skip past the param header and then we will find the param that caused the
1056  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1057  * these will turn of specific features.
1058  */
1059 static void
1060 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1061 {
1062         struct sctp_paramhdr *pbad;
1063
1064         pbad = phdr + 1;
1065         switch (ntohs(pbad->param_type)) {
1066                 /* pr-sctp draft */
1067         case SCTP_PRSCTP_SUPPORTED:
1068                 stcb->asoc.peer_supports_prsctp = 0;
1069                 break;
1070         case SCTP_SUPPORTED_CHUNK_EXT:
1071                 break;
1072                 /* draft-ietf-tsvwg-addip-sctp */
1073         case SCTP_HAS_NAT_SUPPORT:
1074                 stcb->asoc.peer_supports_nat = 0;
1075                 break;
1076         case SCTP_ADD_IP_ADDRESS:
1077         case SCTP_DEL_IP_ADDRESS:
1078         case SCTP_SET_PRIM_ADDR:
1079                 stcb->asoc.peer_supports_asconf = 0;
1080                 break;
1081         case SCTP_SUCCESS_REPORT:
1082         case SCTP_ERROR_CAUSE_IND:
1083                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1084                 SCTPDBG(SCTP_DEBUG_INPUT2,
1085                     "Turning off ASCONF to this strange peer\n");
1086                 stcb->asoc.peer_supports_asconf = 0;
1087                 break;
1088         default:
1089                 SCTPDBG(SCTP_DEBUG_INPUT2,
1090                     "Peer does not support param type %d(%x)??\n",
1091                     pbad->param_type, (uint32_t) pbad->param_type);
1092                 break;
1093         }
1094 }
1095
1096 static int
1097 sctp_handle_error(struct sctp_chunkhdr *ch,
1098     struct sctp_tcb *stcb, struct sctp_nets *net)
1099 {
1100         int chklen;
1101         struct sctp_paramhdr *phdr;
1102         uint16_t error_type;
1103         uint16_t error_len;
1104         struct sctp_association *asoc;
1105         int adjust;
1106
1107 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1108         struct socket *so;
1109
1110 #endif
1111
1112         /* parse through all of the errors and process */
1113         asoc = &stcb->asoc;
1114         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1115             sizeof(struct sctp_chunkhdr));
1116         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1117         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1118                 /* Process an Error Cause */
1119                 error_type = ntohs(phdr->param_type);
1120                 error_len = ntohs(phdr->param_length);
1121                 if ((error_len > chklen) || (error_len == 0)) {
1122                         /* invalid param length for this param */
1123                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1124                             chklen, error_len);
1125                         return (0);
1126                 }
1127                 switch (error_type) {
1128                 case SCTP_CAUSE_INVALID_STREAM:
1129                 case SCTP_CAUSE_MISSING_PARAM:
1130                 case SCTP_CAUSE_INVALID_PARAM:
1131                 case SCTP_CAUSE_NO_USER_DATA:
1132                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1133                             error_type);
1134                         break;
1135                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1136                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1137                             ch->chunk_flags);
1138                         if (sctp_handle_nat_colliding_state(stcb)) {
1139                                 return (0);
1140                         }
1141                         break;
1142                 case SCTP_CAUSE_NAT_MISSING_STATE:
1143                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1144                             ch->chunk_flags);
1145                         if (sctp_handle_nat_missing_state(stcb, net)) {
1146                                 return (0);
1147                         }
1148                         break;
1149                 case SCTP_CAUSE_STALE_COOKIE:
1150                         /*
1151                          * We only act if we have echoed a cookie and are
1152                          * waiting.
1153                          */
1154                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1155                                 int *p;
1156
1157                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1158                                 /* Save the time doubled */
1159                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1160                                 asoc->stale_cookie_count++;
1161                                 if (asoc->stale_cookie_count >
1162                                     asoc->max_init_times) {
1163                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1164                                         /* now free the asoc */
1165 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1166                                         so = SCTP_INP_SO(stcb->sctp_ep);
1167                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1168                                         SCTP_TCB_UNLOCK(stcb);
1169                                         SCTP_SOCKET_LOCK(so, 1);
1170                                         SCTP_TCB_LOCK(stcb);
1171                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1172 #endif
1173                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1174                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1175 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1176                                         SCTP_SOCKET_UNLOCK(so, 1);
1177 #endif
1178                                         return (-1);
1179                                 }
1180                                 /* blast back to INIT state */
1181                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1182                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1183                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1184                                 sctp_stop_all_cookie_timers(stcb);
1185                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1186                         }
1187                         break;
1188                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1189                         /*
1190                          * Nothing we can do here, we don't do hostname
1191                          * addresses so if the peer does not like my IPv6
1192                          * (or IPv4 for that matter) it does not matter. If
1193                          * they don't support that type of address, they can
1194                          * NOT possibly get that packet type... i.e. with no
1195                          * IPv6 you can't recieve a IPv6 packet. so we can
1196                          * safely ignore this one. If we ever added support
1197                          * for HOSTNAME Addresses, then we would need to do
1198                          * something here.
1199                          */
1200                         break;
1201                 case SCTP_CAUSE_UNRECOG_CHUNK:
1202                         sctp_process_unrecog_chunk(stcb, phdr, net);
1203                         break;
1204                 case SCTP_CAUSE_UNRECOG_PARAM:
1205                         sctp_process_unrecog_param(stcb, phdr);
1206                         break;
1207                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1208                         /*
1209                          * We ignore this since the timer will drive out a
1210                          * new cookie anyway and there timer will drive us
1211                          * to send a SHUTDOWN_COMPLETE. We can't send one
1212                          * here since we don't have their tag.
1213                          */
1214                         break;
1215                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1216                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1217                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1218                         /*
1219                          * We should NOT get these here, but in a
1220                          * ASCONF-ACK.
1221                          */
1222                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1223                             error_type);
1224                         break;
1225                 case SCTP_CAUSE_OUT_OF_RESC:
1226                         /*
1227                          * And what, pray tell do we do with the fact that
1228                          * the peer is out of resources? Not really sure we
1229                          * could do anything but abort. I suspect this
1230                          * should have came WITH an abort instead of in a
1231                          * OP-ERROR.
1232                          */
1233                         break;
1234                 default:
1235                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1236                             error_type);
1237                         break;
1238                 }
1239                 adjust = SCTP_SIZE32(error_len);
1240                 chklen -= adjust;
1241                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1242         }
1243         return (0);
1244 }
1245
1246 static int
1247 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1248     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1249     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1250 {
1251         struct sctp_init_ack *init_ack;
1252         struct mbuf *op_err;
1253
1254         SCTPDBG(SCTP_DEBUG_INPUT2,
1255             "sctp_handle_init_ack: handling INIT-ACK\n");
1256
1257         if (stcb == NULL) {
1258                 SCTPDBG(SCTP_DEBUG_INPUT2,
1259                     "sctp_handle_init_ack: TCB is null\n");
1260                 return (-1);
1261         }
1262         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1263                 /* Invalid length */
1264                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1265                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1266                     op_err, 0, net->port);
1267                 *abort_no_unlock = 1;
1268                 return (-1);
1269         }
1270         init_ack = &cp->init;
1271         /* validate parameters */
1272         if (init_ack->initiate_tag == 0) {
1273                 /* protocol error... send an abort */
1274                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1275                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1276                     op_err, 0, net->port);
1277                 *abort_no_unlock = 1;
1278                 return (-1);
1279         }
1280         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1281                 /* protocol error... send an abort */
1282                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1283                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1284                     op_err, 0, net->port);
1285                 *abort_no_unlock = 1;
1286                 return (-1);
1287         }
1288         if (init_ack->num_inbound_streams == 0) {
1289                 /* protocol error... send an abort */
1290                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1291                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1292                     op_err, 0, net->port);
1293                 *abort_no_unlock = 1;
1294                 return (-1);
1295         }
1296         if (init_ack->num_outbound_streams == 0) {
1297                 /* protocol error... send an abort */
1298                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1299                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1300                     op_err, 0, net->port);
1301                 *abort_no_unlock = 1;
1302                 return (-1);
1303         }
1304         /* process according to association state... */
1305         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1306         case SCTP_STATE_COOKIE_WAIT:
1307                 /* this is the expected state for this chunk */
1308                 /* process the INIT-ACK parameters */
1309                 if (stcb->asoc.primary_destination->dest_state &
1310                     SCTP_ADDR_UNCONFIRMED) {
1311                         /*
1312                          * The primary is where we sent the INIT, we can
1313                          * always consider it confirmed when the INIT-ACK is
1314                          * returned. Do this before we load addresses
1315                          * though.
1316                          */
1317                         stcb->asoc.primary_destination->dest_state &=
1318                             ~SCTP_ADDR_UNCONFIRMED;
1319                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1320                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1321                 }
1322                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1323                     net, abort_no_unlock, vrf_id) < 0) {
1324                         /* error in parsing parameters */
1325                         return (-1);
1326                 }
1327                 /* update our state */
1328                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1329                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1330
1331                 /* reset the RTO calc */
1332                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1333                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1334                             stcb->asoc.overall_error_count,
1335                             0,
1336                             SCTP_FROM_SCTP_INPUT,
1337                             __LINE__);
1338                 }
1339                 stcb->asoc.overall_error_count = 0;
1340                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1341                 /*
1342                  * collapse the init timer back in case of a exponential
1343                  * backoff
1344                  */
1345                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1346                     stcb, net);
1347                 /*
1348                  * the send at the end of the inbound data processing will
1349                  * cause the cookie to be sent
1350                  */
1351                 break;
1352         case SCTP_STATE_SHUTDOWN_SENT:
1353                 /* incorrect state... discard */
1354                 break;
1355         case SCTP_STATE_COOKIE_ECHOED:
1356                 /* incorrect state... discard */
1357                 break;
1358         case SCTP_STATE_OPEN:
1359                 /* incorrect state... discard */
1360                 break;
1361         case SCTP_STATE_EMPTY:
1362         case SCTP_STATE_INUSE:
1363         default:
1364                 /* incorrect state... discard */
1365                 return (-1);
1366                 break;
1367         }
1368         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1369         return (0);
1370 }
1371
1372 static struct sctp_tcb *
1373 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1374     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1375     struct sctp_inpcb *inp, struct sctp_nets **netp,
1376     struct sockaddr *init_src, int *notification,
1377     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1378     uint32_t vrf_id, uint16_t port);
1379
1380
1381 /*
1382  * handle a state cookie for an existing association m: input packet mbuf
1383  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1384  * "split" mbuf and the cookie signature does not exist offset: offset into
1385  * mbuf to the cookie-echo chunk
1386  */
1387 static struct sctp_tcb *
1388 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1389     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1390     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1391     struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id,
1392     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1393 {
1394         struct sctp_association *asoc;
1395         struct sctp_init_chunk *init_cp, init_buf;
1396         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1397         struct sctp_nets *net;
1398         struct mbuf *op_err;
1399         struct sctp_paramhdr *ph;
1400         int chk_length;
1401         int init_offset, initack_offset, i;
1402         int retval;
1403         int spec_flag = 0;
1404         uint32_t how_indx;
1405
1406         net = *netp;
1407         /* I know that the TCB is non-NULL from the caller */
1408         asoc = &stcb->asoc;
1409         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1410                 if (asoc->cookie_how[how_indx] == 0)
1411                         break;
1412         }
1413         if (how_indx < sizeof(asoc->cookie_how)) {
1414                 asoc->cookie_how[how_indx] = 1;
1415         }
1416         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1417                 /* SHUTDOWN came in after sending INIT-ACK */
1418                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1419                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1420                     0, M_DONTWAIT, 1, MT_DATA);
1421                 if (op_err == NULL) {
1422                         /* FOOBAR */
1423                         return (NULL);
1424                 }
1425                 /* Set the len */
1426                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1427                 ph = mtod(op_err, struct sctp_paramhdr *);
1428                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1429                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1430                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1431                     vrf_id, net->port);
1432                 if (how_indx < sizeof(asoc->cookie_how))
1433                         asoc->cookie_how[how_indx] = 2;
1434                 return (NULL);
1435         }
1436         /*
1437          * find and validate the INIT chunk in the cookie (peer's info) the
1438          * INIT should start after the cookie-echo header struct (chunk
1439          * header, state cookie header struct)
1440          */
1441         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1442
1443         init_cp = (struct sctp_init_chunk *)
1444             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1445             (uint8_t *) & init_buf);
1446         if (init_cp == NULL) {
1447                 /* could not pull a INIT chunk in cookie */
1448                 return (NULL);
1449         }
1450         chk_length = ntohs(init_cp->ch.chunk_length);
1451         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1452                 return (NULL);
1453         }
1454         /*
1455          * find and validate the INIT-ACK chunk in the cookie (my info) the
1456          * INIT-ACK follows the INIT chunk
1457          */
1458         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1459         initack_cp = (struct sctp_init_ack_chunk *)
1460             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1461             (uint8_t *) & initack_buf);
1462         if (initack_cp == NULL) {
1463                 /* could not pull INIT-ACK chunk in cookie */
1464                 return (NULL);
1465         }
1466         chk_length = ntohs(initack_cp->ch.chunk_length);
1467         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1468                 return (NULL);
1469         }
1470         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1471             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1472                 /*
1473                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1474                  * to get into the OPEN state
1475                  */
1476                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1477                         /*-
1478                          * Opps, this means that we somehow generated two vtag's
1479                          * the same. I.e. we did:
1480                          *  Us               Peer
1481                          *   <---INIT(tag=a)------
1482                          *   ----INIT-ACK(tag=t)-->
1483                          *   ----INIT(tag=t)------> *1
1484                          *   <---INIT-ACK(tag=a)---
1485                          *   <----CE(tag=t)------------- *2
1486                          *
1487                          * At point *1 we should be generating a different
1488                          * tag t'. Which means we would throw away the CE and send
1489                          * ours instead. Basically this is case C (throw away side).
1490                          */
1491                         if (how_indx < sizeof(asoc->cookie_how))
1492                                 asoc->cookie_how[how_indx] = 17;
1493                         return (NULL);
1494
1495                 }
1496                 switch SCTP_GET_STATE
1497                         (asoc) {
1498                 case SCTP_STATE_COOKIE_WAIT:
1499                 case SCTP_STATE_COOKIE_ECHOED:
1500                         /*
1501                          * INIT was sent but got a COOKIE_ECHO with the
1502                          * correct tags... just accept it...but we must
1503                          * process the init so that we can make sure we have
1504                          * the right seq no's.
1505                          */
1506                         /* First we must process the INIT !! */
1507                         retval = sctp_process_init(init_cp, stcb, net);
1508                         if (retval < 0) {
1509                                 if (how_indx < sizeof(asoc->cookie_how))
1510                                         asoc->cookie_how[how_indx] = 3;
1511                                 return (NULL);
1512                         }
1513                         /* we have already processed the INIT so no problem */
1514                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1515                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1516                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1517                         /* update current state */
1518                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1519                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1520                         else
1521                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1522
1523                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1524                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1525                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1526                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1527                         }
1528                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1529                         sctp_stop_all_cookie_timers(stcb);
1530                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1531                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1532                             (inp->sctp_socket->so_qlimit == 0)
1533                             ) {
1534 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1535                                 struct socket *so;
1536
1537 #endif
1538                                 /*
1539                                  * Here is where collision would go if we
1540                                  * did a connect() and instead got a
1541                                  * init/init-ack/cookie done before the
1542                                  * init-ack came back..
1543                                  */
1544                                 stcb->sctp_ep->sctp_flags |=
1545                                     SCTP_PCB_FLAGS_CONNECTED;
1546 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1547                                 so = SCTP_INP_SO(stcb->sctp_ep);
1548                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1549                                 SCTP_TCB_UNLOCK(stcb);
1550                                 SCTP_SOCKET_LOCK(so, 1);
1551                                 SCTP_TCB_LOCK(stcb);
1552                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1553                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1554                                         SCTP_SOCKET_UNLOCK(so, 1);
1555                                         return (NULL);
1556                                 }
1557 #endif
1558                                 soisconnected(stcb->sctp_socket);
1559 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1560                                 SCTP_SOCKET_UNLOCK(so, 1);
1561 #endif
1562                         }
1563                         /* notify upper layer */
1564                         *notification = SCTP_NOTIFY_ASSOC_UP;
1565                         /*
1566                          * since we did not send a HB make sure we don't
1567                          * double things
1568                          */
1569                         net->hb_responded = 1;
1570                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1571                             &cookie->time_entered,
1572                             sctp_align_unsafe_makecopy,
1573                             SCTP_RTT_FROM_NON_DATA);
1574
1575                         if (stcb->asoc.sctp_autoclose_ticks &&
1576                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1577                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1578                                     inp, stcb, NULL);
1579                         }
1580                         break;
1581                 default:
1582                         /*
1583                          * we're in the OPEN state (or beyond), so peer must
1584                          * have simply lost the COOKIE-ACK
1585                          */
1586                         break;
1587                         }       /* end switch */
1588                 sctp_stop_all_cookie_timers(stcb);
1589                 /*
1590                  * We ignore the return code here.. not sure if we should
1591                  * somehow abort.. but we do have an existing asoc. This
1592                  * really should not fail.
1593                  */
1594                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1595                     init_offset + sizeof(struct sctp_init_chunk),
1596                     initack_offset, sh, init_src)) {
1597                         if (how_indx < sizeof(asoc->cookie_how))
1598                                 asoc->cookie_how[how_indx] = 4;
1599                         return (NULL);
1600                 }
1601                 /* respond with a COOKIE-ACK */
1602                 sctp_toss_old_cookies(stcb, asoc);
1603                 sctp_send_cookie_ack(stcb);
1604                 if (how_indx < sizeof(asoc->cookie_how))
1605                         asoc->cookie_how[how_indx] = 5;
1606                 return (stcb);
1607         }
1608         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1609             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1610             cookie->tie_tag_my_vtag == 0 &&
1611             cookie->tie_tag_peer_vtag == 0) {
1612                 /*
1613                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1614                  */
1615                 if (how_indx < sizeof(asoc->cookie_how))
1616                         asoc->cookie_how[how_indx] = 6;
1617                 return (NULL);
1618         }
1619         /*
1620          * If nat support, and the below and stcb is established, send back
1621          * a ABORT(colliding state) if we are established.
1622          */
1623         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1624             (asoc->peer_supports_nat) &&
1625             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1626             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1627             (asoc->peer_vtag == 0)))) {
1628                 /*
1629                  * Special case - Peer's support nat. We may have two init's
1630                  * that we gave out the same tag on since one was not
1631                  * established.. i.e. we get INIT from host-1 behind the nat
1632                  * and we respond tag-a, we get a INIT from host-2 behind
1633                  * the nat and we get tag-a again. Then we bring up host-1
1634                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1635                  * Now we have colliding state. We must send an abort here
1636                  * with colliding state indication.
1637                  */
1638                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1639                     0, M_DONTWAIT, 1, MT_DATA);
1640                 if (op_err == NULL) {
1641                         /* FOOBAR */
1642                         return (NULL);
1643                 }
1644                 /* pre-reserve some space */
1645 #ifdef INET6
1646                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1647 #else
1648                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1649 #endif
1650                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1651                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1652                 /* Set the len */
1653                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1654                 ph = mtod(op_err, struct sctp_paramhdr *);
1655                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1656                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1657                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1658                 return (NULL);
1659         }
1660         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1661             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1662             (asoc->peer_vtag == 0))) {
1663                 /*
1664                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1665                  * should be ok, re-accept peer info
1666                  */
1667                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1668                         /*
1669                          * Extension of case C. If we hit this, then the
1670                          * random number generator returned the same vtag
1671                          * when we first sent our INIT-ACK and when we later
1672                          * sent our INIT. The side with the seq numbers that
1673                          * are different will be the one that normnally
1674                          * would have hit case C. This in effect "extends"
1675                          * our vtags in this collision case to be 64 bits.
1676                          * The same collision could occur aka you get both
1677                          * vtag and seq number the same twice in a row.. but
1678                          * is much less likely. If it did happen then we
1679                          * would proceed through and bring up the assoc.. we
1680                          * may end up with the wrong stream setup however..
1681                          * which would be bad.. but there is no way to
1682                          * tell.. until we send on a stream that does not
1683                          * exist :-)
1684                          */
1685                         if (how_indx < sizeof(asoc->cookie_how))
1686                                 asoc->cookie_how[how_indx] = 7;
1687
1688                         return (NULL);
1689                 }
1690                 if (how_indx < sizeof(asoc->cookie_how))
1691                         asoc->cookie_how[how_indx] = 8;
1692                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1693                 sctp_stop_all_cookie_timers(stcb);
1694                 /*
1695                  * since we did not send a HB make sure we don't double
1696                  * things
1697                  */
1698                 net->hb_responded = 1;
1699                 if (stcb->asoc.sctp_autoclose_ticks &&
1700                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1701                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1702                             NULL);
1703                 }
1704                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1705                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1706
1707                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1708                         /*
1709                          * Ok the peer probably discarded our data (if we
1710                          * echoed a cookie+data). So anything on the
1711                          * sent_queue should be marked for retransmit, we
1712                          * may not get something to kick us so it COULD
1713                          * still take a timeout to move these.. but it can't
1714                          * hurt to mark them.
1715                          */
1716                         struct sctp_tmit_chunk *chk;
1717
1718                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1719                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1720                                         chk->sent = SCTP_DATAGRAM_RESEND;
1721                                         sctp_flight_size_decrease(chk);
1722                                         sctp_total_flight_decrease(stcb, chk);
1723                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1724                                         spec_flag++;
1725                                 }
1726                         }
1727
1728                 }
1729                 /* process the INIT info (peer's info) */
1730                 retval = sctp_process_init(init_cp, stcb, net);
1731                 if (retval < 0) {
1732                         if (how_indx < sizeof(asoc->cookie_how))
1733                                 asoc->cookie_how[how_indx] = 9;
1734                         return (NULL);
1735                 }
1736                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1737                     init_offset + sizeof(struct sctp_init_chunk),
1738                     initack_offset, sh, init_src)) {
1739                         if (how_indx < sizeof(asoc->cookie_how))
1740                                 asoc->cookie_how[how_indx] = 10;
1741                         return (NULL);
1742                 }
1743                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1744                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1745                         *notification = SCTP_NOTIFY_ASSOC_UP;
1746
1747                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1748                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1749                             (inp->sctp_socket->so_qlimit == 0)) {
1750 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1751                                 struct socket *so;
1752
1753 #endif
1754                                 stcb->sctp_ep->sctp_flags |=
1755                                     SCTP_PCB_FLAGS_CONNECTED;
1756 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1757                                 so = SCTP_INP_SO(stcb->sctp_ep);
1758                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1759                                 SCTP_TCB_UNLOCK(stcb);
1760                                 SCTP_SOCKET_LOCK(so, 1);
1761                                 SCTP_TCB_LOCK(stcb);
1762                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1763                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1764                                         SCTP_SOCKET_UNLOCK(so, 1);
1765                                         return (NULL);
1766                                 }
1767 #endif
1768                                 soisconnected(stcb->sctp_socket);
1769 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1770                                 SCTP_SOCKET_UNLOCK(so, 1);
1771 #endif
1772                         }
1773                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1774                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1775                         else
1776                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1777                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1778                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1779                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1780                 } else {
1781                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1782                 }
1783                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1784                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1785                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1786                             stcb->sctp_ep, stcb, asoc->primary_destination);
1787                 }
1788                 sctp_stop_all_cookie_timers(stcb);
1789                 sctp_toss_old_cookies(stcb, asoc);
1790                 sctp_send_cookie_ack(stcb);
1791                 if (spec_flag) {
1792                         /*
1793                          * only if we have retrans set do we do this. What
1794                          * this call does is get only the COOKIE-ACK out and
1795                          * then when we return the normal call to
1796                          * sctp_chunk_output will get the retrans out behind
1797                          * this.
1798                          */
1799                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1800                 }
1801                 if (how_indx < sizeof(asoc->cookie_how))
1802                         asoc->cookie_how[how_indx] = 11;
1803
1804                 return (stcb);
1805         }
1806         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1807             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1808             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1809             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1810             cookie->tie_tag_peer_vtag != 0) {
1811                 struct sctpasochead *head;
1812
1813                 if (asoc->peer_supports_nat) {
1814                         /*
1815                          * This is a gross gross hack. just call the
1816                          * cookie_new code since we are allowing a duplicate
1817                          * association. I hope this works...
1818                          */
1819                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1820                             inp, netp, init_src, notification,
1821                             auth_skipped, auth_offset, auth_len,
1822                             vrf_id, port));
1823                 }
1824                 /*
1825                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1826                  */
1827                 /* temp code */
1828                 if (how_indx < sizeof(asoc->cookie_how))
1829                         asoc->cookie_how[how_indx] = 12;
1830                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1831                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1832
1833                 *sac_assoc_id = sctp_get_associd(stcb);
1834                 /* notify upper layer */
1835                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1836                 atomic_add_int(&stcb->asoc.refcnt, 1);
1837                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1838                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1839                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1840                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1841                 }
1842                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1843                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1844                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1845                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1846                 }
1847                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1848                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1849                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1850                             stcb->sctp_ep, stcb, asoc->primary_destination);
1851
1852                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1853                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1854                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1855                 }
1856                 asoc->pre_open_streams =
1857                     ntohs(initack_cp->init.num_outbound_streams);
1858                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1859                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1860                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1861
1862                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1863
1864                 asoc->str_reset_seq_in = asoc->init_seq_number;
1865
1866                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1867                 if (asoc->mapping_array) {
1868                         memset(asoc->mapping_array, 0,
1869                             asoc->mapping_array_size);
1870                 }
1871                 if (asoc->nr_mapping_array) {
1872                         memset(asoc->nr_mapping_array, 0,
1873                             asoc->mapping_array_size);
1874                 }
1875                 SCTP_TCB_UNLOCK(stcb);
1876                 SCTP_INP_INFO_WLOCK();
1877                 SCTP_INP_WLOCK(stcb->sctp_ep);
1878                 SCTP_TCB_LOCK(stcb);
1879                 atomic_add_int(&stcb->asoc.refcnt, -1);
1880                 /* send up all the data */
1881                 SCTP_TCB_SEND_LOCK(stcb);
1882
1883                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1884                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1885                         stcb->asoc.strmout[i].stream_no = i;
1886                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1887                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1888                 }
1889                 /* process the INIT-ACK info (my info) */
1890                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1891                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1892
1893                 /* pull from vtag hash */
1894                 LIST_REMOVE(stcb, sctp_asocs);
1895                 /* re-insert to new vtag position */
1896                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1897                     SCTP_BASE_INFO(hashasocmark))];
1898                 /*
1899                  * put it in the bucket in the vtag hash of assoc's for the
1900                  * system
1901                  */
1902                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1903
1904                 /* process the INIT info (peer's info) */
1905                 SCTP_TCB_SEND_UNLOCK(stcb);
1906                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1907                 SCTP_INP_INFO_WUNLOCK();
1908
1909                 retval = sctp_process_init(init_cp, stcb, net);
1910                 if (retval < 0) {
1911                         if (how_indx < sizeof(asoc->cookie_how))
1912                                 asoc->cookie_how[how_indx] = 13;
1913
1914                         return (NULL);
1915                 }
1916                 /*
1917                  * since we did not send a HB make sure we don't double
1918                  * things
1919                  */
1920                 net->hb_responded = 1;
1921
1922                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1923                     init_offset + sizeof(struct sctp_init_chunk),
1924                     initack_offset, sh, init_src)) {
1925                         if (how_indx < sizeof(asoc->cookie_how))
1926                                 asoc->cookie_how[how_indx] = 14;
1927
1928                         return (NULL);
1929                 }
1930                 /* respond with a COOKIE-ACK */
1931                 sctp_stop_all_cookie_timers(stcb);
1932                 sctp_toss_old_cookies(stcb, asoc);
1933                 sctp_send_cookie_ack(stcb);
1934                 if (how_indx < sizeof(asoc->cookie_how))
1935                         asoc->cookie_how[how_indx] = 15;
1936
1937                 return (stcb);
1938         }
1939         if (how_indx < sizeof(asoc->cookie_how))
1940                 asoc->cookie_how[how_indx] = 16;
1941         /* all other cases... */
1942         return (NULL);
1943 }
1944
1945
1946 /*
1947  * handle a state cookie for a new association m: input packet mbuf chain--
1948  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1949  * and the cookie signature does not exist offset: offset into mbuf to the
1950  * cookie-echo chunk length: length of the cookie chunk to: where the init
1951  * was from returns a new TCB
1952  */
1953 struct sctp_tcb *
1954 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1955     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1956     struct sctp_inpcb *inp, struct sctp_nets **netp,
1957     struct sockaddr *init_src, int *notification,
1958     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1959     uint32_t vrf_id, uint16_t port)
1960 {
1961         struct sctp_tcb *stcb;
1962         struct sctp_init_chunk *init_cp, init_buf;
1963         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1964         struct sockaddr_storage sa_store;
1965         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1966         struct sctp_association *asoc;
1967         int chk_length;
1968         int init_offset, initack_offset, initack_limit;
1969         int retval;
1970         int error = 0;
1971         uint32_t old_tag;
1972         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1973
1974 #ifdef INET
1975         struct sockaddr_in *sin;
1976
1977 #endif
1978 #ifdef INET6
1979         struct sockaddr_in6 *sin6;
1980
1981 #endif
1982 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1983         struct socket *so;
1984
1985         so = SCTP_INP_SO(inp);
1986 #endif
1987
1988         /*
1989          * find and validate the INIT chunk in the cookie (peer's info) the
1990          * INIT should start after the cookie-echo header struct (chunk
1991          * header, state cookie header struct)
1992          */
1993         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1994         init_cp = (struct sctp_init_chunk *)
1995             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1996             (uint8_t *) & init_buf);
1997         if (init_cp == NULL) {
1998                 /* could not pull a INIT chunk in cookie */
1999                 SCTPDBG(SCTP_DEBUG_INPUT1,
2000                     "process_cookie_new: could not pull INIT chunk hdr\n");
2001                 return (NULL);
2002         }
2003         chk_length = ntohs(init_cp->ch.chunk_length);
2004         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2005                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2006                 return (NULL);
2007         }
2008         initack_offset = init_offset + SCTP_SIZE32(chk_length);
2009         /*
2010          * find and validate the INIT-ACK chunk in the cookie (my info) the
2011          * INIT-ACK follows the INIT chunk
2012          */
2013         initack_cp = (struct sctp_init_ack_chunk *)
2014             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2015             (uint8_t *) & initack_buf);
2016         if (initack_cp == NULL) {
2017                 /* could not pull INIT-ACK chunk in cookie */
2018                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2019                 return (NULL);
2020         }
2021         chk_length = ntohs(initack_cp->ch.chunk_length);
2022         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2023                 return (NULL);
2024         }
2025         /*
2026          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2027          * "initack_limit" value.  This is because the chk_length field
2028          * includes the length of the cookie, but the cookie is omitted when
2029          * the INIT and INIT_ACK are tacked onto the cookie...
2030          */
2031         initack_limit = offset + cookie_len;
2032
2033         /*
2034          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2035          * and popluate
2036          */
2037
2038         /*
2039          * Here we do a trick, we set in NULL for the proc/thread argument.
2040          * We do this since in effect we only use the p argument when the
2041          * socket is unbound and we must do an implicit bind. Since we are
2042          * getting a cookie, we cannot be unbound.
2043          */
2044         stcb = sctp_aloc_assoc(inp, init_src, &error,
2045             ntohl(initack_cp->init.initiate_tag), vrf_id,
2046             (struct thread *)NULL
2047             );
2048         if (stcb == NULL) {
2049                 struct mbuf *op_err;
2050
2051                 /* memory problem? */
2052                 SCTPDBG(SCTP_DEBUG_INPUT1,
2053                     "process_cookie_new: no room for another TCB!\n");
2054                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2055
2056                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2057                     sh, op_err, vrf_id, port);
2058                 return (NULL);
2059         }
2060         /* get the correct sctp_nets */
2061         if (netp)
2062                 *netp = sctp_findnet(stcb, init_src);
2063
2064         asoc = &stcb->asoc;
2065         /* get scope variables out of cookie */
2066         asoc->ipv4_local_scope = cookie->ipv4_scope;
2067         asoc->site_scope = cookie->site_scope;
2068         asoc->local_scope = cookie->local_scope;
2069         asoc->loopback_scope = cookie->loopback_scope;
2070
2071         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2072             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2073                 struct mbuf *op_err;
2074
2075                 /*
2076                  * Houston we have a problem. The EP changed while the
2077                  * cookie was in flight. Only recourse is to abort the
2078                  * association.
2079                  */
2080                 atomic_add_int(&stcb->asoc.refcnt, 1);
2081                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2082                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2083                     sh, op_err, vrf_id, port);
2084 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2085                 SCTP_TCB_UNLOCK(stcb);
2086                 SCTP_SOCKET_LOCK(so, 1);
2087                 SCTP_TCB_LOCK(stcb);
2088 #endif
2089                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2090                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2091 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2092                 SCTP_SOCKET_UNLOCK(so, 1);
2093 #endif
2094                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2095                 return (NULL);
2096         }
2097         /* process the INIT-ACK info (my info) */
2098         old_tag = asoc->my_vtag;
2099         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2100         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2101         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2102         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2103         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2104         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2105         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2106         asoc->str_reset_seq_in = asoc->init_seq_number;
2107
2108         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2109
2110         /* process the INIT info (peer's info) */
2111         if (netp)
2112                 retval = sctp_process_init(init_cp, stcb, *netp);
2113         else
2114                 retval = 0;
2115         if (retval < 0) {
2116                 atomic_add_int(&stcb->asoc.refcnt, 1);
2117 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2118                 SCTP_TCB_UNLOCK(stcb);
2119                 SCTP_SOCKET_LOCK(so, 1);
2120                 SCTP_TCB_LOCK(stcb);
2121 #endif
2122                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2123 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2124                 SCTP_SOCKET_UNLOCK(so, 1);
2125 #endif
2126                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2127                 return (NULL);
2128         }
2129         /* load all addresses */
2130         if (sctp_load_addresses_from_init(stcb, m, iphlen,
2131             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2132             init_src)) {
2133                 atomic_add_int(&stcb->asoc.refcnt, 1);
2134 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2135                 SCTP_TCB_UNLOCK(stcb);
2136                 SCTP_SOCKET_LOCK(so, 1);
2137                 SCTP_TCB_LOCK(stcb);
2138 #endif
2139                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2140 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2141                 SCTP_SOCKET_UNLOCK(so, 1);
2142 #endif
2143                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2144                 return (NULL);
2145         }
2146         /*
2147          * verify any preceding AUTH chunk that was skipped
2148          */
2149         /* pull the local authentication parameters from the cookie/init-ack */
2150         sctp_auth_get_cookie_params(stcb, m,
2151             initack_offset + sizeof(struct sctp_init_ack_chunk),
2152             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2153         if (auth_skipped) {
2154                 struct sctp_auth_chunk *auth;
2155
2156                 auth = (struct sctp_auth_chunk *)
2157                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2158                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2159                         /* auth HMAC failed, dump the assoc and packet */
2160                         SCTPDBG(SCTP_DEBUG_AUTH1,
2161                             "COOKIE-ECHO: AUTH failed\n");
2162                         atomic_add_int(&stcb->asoc.refcnt, 1);
2163 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2164                         SCTP_TCB_UNLOCK(stcb);
2165                         SCTP_SOCKET_LOCK(so, 1);
2166                         SCTP_TCB_LOCK(stcb);
2167 #endif
2168                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2169 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2170                         SCTP_SOCKET_UNLOCK(so, 1);
2171 #endif
2172                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2173                         return (NULL);
2174                 } else {
2175                         /* remaining chunks checked... good to go */
2176                         stcb->asoc.authenticated = 1;
2177                 }
2178         }
2179         /* update current state */
2180         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2181         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2182         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2183                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2184                     stcb->sctp_ep, stcb, asoc->primary_destination);
2185         }
2186         sctp_stop_all_cookie_timers(stcb);
2187         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2188         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2189
2190         /*
2191          * if we're doing ASCONFs, check to see if we have any new local
2192          * addresses that need to get added to the peer (eg. addresses
2193          * changed while cookie echo in flight).  This needs to be done
2194          * after we go to the OPEN state to do the correct asconf
2195          * processing. else, make sure we have the correct addresses in our
2196          * lists
2197          */
2198
2199         /* warning, we re-use sin, sin6, sa_store here! */
2200         /* pull in local_address (our "from" address) */
2201         switch (cookie->laddr_type) {
2202 #ifdef INET
2203         case SCTP_IPV4_ADDRESS:
2204                 /* source addr is IPv4 */
2205                 sin = (struct sockaddr_in *)initack_src;
2206                 memset(sin, 0, sizeof(*sin));
2207                 sin->sin_family = AF_INET;
2208                 sin->sin_len = sizeof(struct sockaddr_in);
2209                 sin->sin_addr.s_addr = cookie->laddress[0];
2210                 break;
2211 #endif
2212 #ifdef INET6
2213         case SCTP_IPV6_ADDRESS:
2214                 /* source addr is IPv6 */
2215                 sin6 = (struct sockaddr_in6 *)initack_src;
2216                 memset(sin6, 0, sizeof(*sin6));
2217                 sin6->sin6_family = AF_INET6;
2218                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2219                 sin6->sin6_scope_id = cookie->scope_id;
2220                 memcpy(&sin6->sin6_addr, cookie->laddress,
2221                     sizeof(sin6->sin6_addr));
2222                 break;
2223 #endif
2224         default:
2225                 atomic_add_int(&stcb->asoc.refcnt, 1);
2226 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2227                 SCTP_TCB_UNLOCK(stcb);
2228                 SCTP_SOCKET_LOCK(so, 1);
2229                 SCTP_TCB_LOCK(stcb);
2230 #endif
2231                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2232 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2233                 SCTP_SOCKET_UNLOCK(so, 1);
2234 #endif
2235                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2236                 return (NULL);
2237         }
2238
2239         /* set up to notify upper layer */
2240         *notification = SCTP_NOTIFY_ASSOC_UP;
2241         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2242             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2243             (inp->sctp_socket->so_qlimit == 0)) {
2244                 /*
2245                  * This is an endpoint that called connect() how it got a
2246                  * cookie that is NEW is a bit of a mystery. It must be that
2247                  * the INIT was sent, but before it got there.. a complete
2248                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2249                  * should have went to the other code.. not here.. oh well..
2250                  * a bit of protection is worth having..
2251                  */
2252                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2253 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2254                 atomic_add_int(&stcb->asoc.refcnt, 1);
2255                 SCTP_TCB_UNLOCK(stcb);
2256                 SCTP_SOCKET_LOCK(so, 1);
2257                 SCTP_TCB_LOCK(stcb);
2258                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2259                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2260                         SCTP_SOCKET_UNLOCK(so, 1);
2261                         return (NULL);
2262                 }
2263 #endif
2264                 soisconnected(stcb->sctp_socket);
2265 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2266                 SCTP_SOCKET_UNLOCK(so, 1);
2267 #endif
2268         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2269             (inp->sctp_socket->so_qlimit)) {
2270                 /*
2271                  * We don't want to do anything with this one. Since it is
2272                  * the listening guy. The timer will get started for
2273                  * accepted connections in the caller.
2274                  */
2275                 ;
2276         }
2277         /* since we did not send a HB make sure we don't double things */
2278         if ((netp) && (*netp))
2279                 (*netp)->hb_responded = 1;
2280
2281         if (stcb->asoc.sctp_autoclose_ticks &&
2282             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2283                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2284         }
2285         /* calculate the RTT */
2286         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2287         if ((netp) && (*netp)) {
2288                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2289                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2290                     SCTP_RTT_FROM_NON_DATA);
2291         }
2292         /* respond with a COOKIE-ACK */
2293         sctp_send_cookie_ack(stcb);
2294
2295         /*
2296          * check the address lists for any ASCONFs that need to be sent
2297          * AFTER the cookie-ack is sent
2298          */
2299         sctp_check_address_list(stcb, m,
2300             initack_offset + sizeof(struct sctp_init_ack_chunk),
2301             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2302             initack_src, cookie->local_scope, cookie->site_scope,
2303             cookie->ipv4_scope, cookie->loopback_scope);
2304
2305
2306         return (stcb);
2307 }
2308
2309 /*
2310  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2311  * we NEED to make sure we are not already using the vtag. If so we
2312  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2313         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2314                                                             SCTP_BASE_INFO(hashasocmark))];
2315         LIST_FOREACH(stcb, head, sctp_asocs) {
2316                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2317                        -- SEND ABORT - TRY AGAIN --
2318                 }
2319         }
2320 */
2321
2322 /*
2323  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2324  * existing (non-NULL) TCB
2325  */
2326 static struct mbuf *
2327 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2328     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2329     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2330     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2331     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2332 {
2333         struct sctp_state_cookie *cookie;
2334         struct sctp_tcb *l_stcb = *stcb;
2335         struct sctp_inpcb *l_inp;
2336         struct sockaddr *to;
2337         sctp_assoc_t sac_restart_id;
2338         struct sctp_pcb *ep;
2339         struct mbuf *m_sig;
2340         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2341         uint8_t *sig;
2342         uint8_t cookie_ok = 0;
2343         unsigned int size_of_pkt, sig_offset, cookie_offset;
2344         unsigned int cookie_len;
2345         struct timeval now;
2346         struct timeval time_expires;
2347         struct sockaddr_storage dest_store;
2348         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2349         struct ip *iph;
2350         int notification = 0;
2351         struct sctp_nets *netl;
2352         int had_a_existing_tcb = 0;
2353         int send_int_conf = 0;
2354
2355 #ifdef INET
2356         struct sockaddr_in sin;
2357
2358 #endif
2359 #ifdef INET6
2360         struct sockaddr_in6 sin6;
2361
2362 #endif
2363
2364         SCTPDBG(SCTP_DEBUG_INPUT2,
2365             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2366
2367         if (inp_p == NULL) {
2368                 return (NULL);
2369         }
2370         /* First get the destination address setup too. */
2371         iph = mtod(m, struct ip *);
2372         switch (iph->ip_v) {
2373 #ifdef INET
2374         case IPVERSION:
2375                 {
2376                         /* its IPv4 */
2377                         struct sockaddr_in *lsin;
2378
2379                         lsin = (struct sockaddr_in *)(localep_sa);
2380                         memset(lsin, 0, sizeof(*lsin));
2381                         lsin->sin_family = AF_INET;
2382                         lsin->sin_len = sizeof(*lsin);
2383                         lsin->sin_port = sh->dest_port;
2384                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2385                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2386                         break;
2387                 }
2388 #endif
2389 #ifdef INET6
2390         case IPV6_VERSION >> 4:
2391                 {
2392                         /* its IPv6 */
2393                         struct ip6_hdr *ip6;
2394                         struct sockaddr_in6 *lsin6;
2395
2396                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2397                         memset(lsin6, 0, sizeof(*lsin6));
2398                         lsin6->sin6_family = AF_INET6;
2399                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2400                         ip6 = mtod(m, struct ip6_hdr *);
2401                         lsin6->sin6_port = sh->dest_port;
2402                         lsin6->sin6_addr = ip6->ip6_dst;
2403                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2404                         break;
2405                 }
2406 #endif
2407         default:
2408                 return (NULL);
2409         }
2410
2411         cookie = &cp->cookie;
2412         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2413         cookie_len = ntohs(cp->ch.chunk_length);
2414
2415         if ((cookie->peerport != sh->src_port) &&
2416             (cookie->myport != sh->dest_port) &&
2417             (cookie->my_vtag != sh->v_tag)) {
2418                 /*
2419                  * invalid ports or bad tag.  Note that we always leave the
2420                  * v_tag in the header in network order and when we stored
2421                  * it in the my_vtag slot we also left it in network order.
2422                  * This maintains the match even though it may be in the
2423                  * opposite byte order of the machine :->
2424                  */
2425                 return (NULL);
2426         }
2427         if (cookie_len > size_of_pkt ||
2428             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2429             sizeof(struct sctp_init_chunk) +
2430             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2431                 /* cookie too long!  or too small */
2432                 return (NULL);
2433         }
2434         /*
2435          * split off the signature into its own mbuf (since it should not be
2436          * calculated in the sctp_hmac_m() call).
2437          */
2438         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2439         if (sig_offset > size_of_pkt) {
2440                 /* packet not correct size! */
2441                 /* XXX this may already be accounted for earlier... */
2442                 return (NULL);
2443         }
2444         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2445         if (m_sig == NULL) {
2446                 /* out of memory or ?? */
2447                 return (NULL);
2448         }
2449 #ifdef SCTP_MBUF_LOGGING
2450         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2451                 struct mbuf *mat;
2452
2453                 mat = m_sig;
2454                 while (mat) {
2455                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2456                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2457                         }
2458                         mat = SCTP_BUF_NEXT(mat);
2459                 }
2460         }
2461 #endif
2462
2463         /*
2464          * compute the signature/digest for the cookie
2465          */
2466         ep = &(*inp_p)->sctp_ep;
2467         l_inp = *inp_p;
2468         if (l_stcb) {
2469                 SCTP_TCB_UNLOCK(l_stcb);
2470         }
2471         SCTP_INP_RLOCK(l_inp);
2472         if (l_stcb) {
2473                 SCTP_TCB_LOCK(l_stcb);
2474         }
2475         /* which cookie is it? */
2476         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2477             (ep->current_secret_number != ep->last_secret_number)) {
2478                 /* it's the old cookie */
2479                 (void)sctp_hmac_m(SCTP_HMAC,
2480                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2481                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2482         } else {
2483                 /* it's the current cookie */
2484                 (void)sctp_hmac_m(SCTP_HMAC,
2485                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2486                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2487         }
2488         /* get the signature */
2489         SCTP_INP_RUNLOCK(l_inp);
2490         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2491         if (sig == NULL) {
2492                 /* couldn't find signature */
2493                 sctp_m_freem(m_sig);
2494                 return (NULL);
2495         }
2496         /* compare the received digest with the computed digest */
2497         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2498                 /* try the old cookie? */
2499                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2500                     (ep->current_secret_number != ep->last_secret_number)) {
2501                         /* compute digest with old */
2502                         (void)sctp_hmac_m(SCTP_HMAC,
2503                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2504                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2505                         /* compare */
2506                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2507                                 cookie_ok = 1;
2508                 }
2509         } else {
2510                 cookie_ok = 1;
2511         }
2512
2513         /*
2514          * Now before we continue we must reconstruct our mbuf so that
2515          * normal processing of any other chunks will work.
2516          */
2517         {
2518                 struct mbuf *m_at;
2519
2520                 m_at = m;
2521                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2522                         m_at = SCTP_BUF_NEXT(m_at);
2523                 }
2524                 SCTP_BUF_NEXT(m_at) = m_sig;
2525         }
2526
2527         if (cookie_ok == 0) {
2528                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2529                 SCTPDBG(SCTP_DEBUG_INPUT2,
2530                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2531                     (uint32_t) offset, cookie_offset, sig_offset);
2532                 return (NULL);
2533         }
2534         /*
2535          * check the cookie timestamps to be sure it's not stale
2536          */
2537         (void)SCTP_GETTIME_TIMEVAL(&now);
2538         /* Expire time is in Ticks, so we convert to seconds */
2539         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2540         time_expires.tv_usec = cookie->time_entered.tv_usec;
2541         /*
2542          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2543          * is undefined.
2544          */
2545         if (timevalcmp(&now, &time_expires, >)) {
2546                 /* cookie is stale! */
2547                 struct mbuf *op_err;
2548                 struct sctp_stale_cookie_msg *scm;
2549                 uint32_t tim;
2550
2551                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2552                     0, M_DONTWAIT, 1, MT_DATA);
2553                 if (op_err == NULL) {
2554                         /* FOOBAR */
2555                         return (NULL);
2556                 }
2557                 /* Set the len */
2558                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2559                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2560                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2561                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2562                     (sizeof(uint32_t))));
2563                 /* seconds to usec */
2564                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2565                 /* add in usec */
2566                 if (tim == 0)
2567                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2568                 scm->time_usec = htonl(tim);
2569                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2570                     vrf_id, port);
2571                 return (NULL);
2572         }
2573         /*
2574          * Now we must see with the lookup address if we have an existing
2575          * asoc. This will only happen if we were in the COOKIE-WAIT state
2576          * and a INIT collided with us and somewhere the peer sent the
2577          * cookie on another address besides the single address our assoc
2578          * had for him. In this case we will have one of the tie-tags set at
2579          * least AND the address field in the cookie can be used to look it
2580          * up.
2581          */
2582         to = NULL;
2583         switch (cookie->addr_type) {
2584 #ifdef INET6
2585         case SCTP_IPV6_ADDRESS:
2586                 memset(&sin6, 0, sizeof(sin6));
2587                 sin6.sin6_family = AF_INET6;
2588                 sin6.sin6_len = sizeof(sin6);
2589                 sin6.sin6_port = sh->src_port;
2590                 sin6.sin6_scope_id = cookie->scope_id;
2591                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2592                     sizeof(sin6.sin6_addr.s6_addr));
2593                 to = (struct sockaddr *)&sin6;
2594                 break;
2595 #endif
2596 #ifdef INET
2597         case SCTP_IPV4_ADDRESS:
2598                 memset(&sin, 0, sizeof(sin));
2599                 sin.sin_family = AF_INET;
2600                 sin.sin_len = sizeof(sin);
2601                 sin.sin_port = sh->src_port;
2602                 sin.sin_addr.s_addr = cookie->address[0];
2603                 to = (struct sockaddr *)&sin;
2604                 break;
2605 #endif
2606         default:
2607                 /* This should not happen */
2608                 return (NULL);
2609         }
2610         if ((*stcb == NULL) && to) {
2611                 /* Yep, lets check */
2612                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2613                 if (*stcb == NULL) {
2614                         /*
2615                          * We should have only got back the same inp. If we
2616                          * got back a different ep we have a problem. The
2617                          * original findep got back l_inp and now
2618                          */
2619                         if (l_inp != *inp_p) {
2620                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2621                         }
2622                 } else {
2623                         if (*locked_tcb == NULL) {
2624                                 /*
2625                                  * In this case we found the assoc only
2626                                  * after we locked the create lock. This
2627                                  * means we are in a colliding case and we
2628                                  * must make sure that we unlock the tcb if
2629                                  * its one of the cases where we throw away
2630                                  * the incoming packets.
2631                                  */
2632                                 *locked_tcb = *stcb;
2633
2634                                 /*
2635                                  * We must also increment the inp ref count
2636                                  * since the ref_count flags was set when we
2637                                  * did not find the TCB, now we found it
2638                                  * which reduces the refcount.. we must
2639                                  * raise it back out to balance it all :-)
2640                                  */
2641                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2642                                 if ((*stcb)->sctp_ep != l_inp) {
2643                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2644                                             (*stcb)->sctp_ep, l_inp);
2645                                 }
2646                         }
2647                 }
2648         }
2649         if (to == NULL) {
2650                 return (NULL);
2651         }
2652         cookie_len -= SCTP_SIGNATURE_SIZE;
2653         if (*stcb == NULL) {
2654                 /* this is the "normal" case... get a new TCB */
2655                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2656                     cookie_len, *inp_p, netp, to, &notification,
2657                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2658         } else {
2659                 /* this is abnormal... cookie-echo on existing TCB */
2660                 had_a_existing_tcb = 1;
2661                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2662                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2663                     &notification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port);
2664         }
2665
2666         if (*stcb == NULL) {
2667                 /* still no TCB... must be bad cookie-echo */
2668                 return (NULL);
2669         }
2670         if ((*netp != NULL) && (m->m_flags & M_FLOWID)) {
2671                 (*netp)->flowid = m->m_pkthdr.flowid;
2672 #ifdef INVARIANTS
2673                 (*netp)->flowidset = 1;
2674 #endif
2675         }
2676         /*
2677          * Ok, we built an association so confirm the address we sent the
2678          * INIT-ACK to.
2679          */
2680         netl = sctp_findnet(*stcb, to);
2681         /*
2682          * This code should in theory NOT run but
2683          */
2684         if (netl == NULL) {
2685                 /* TSNH! Huh, why do I need to add this address here? */
2686                 int ret;
2687
2688                 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE,
2689                     SCTP_IN_COOKIE_PROC);
2690                 netl = sctp_findnet(*stcb, to);
2691         }
2692         if (netl) {
2693                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2694                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2695                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2696                             netl);
2697                         send_int_conf = 1;
2698                 }
2699         }
2700         if (*stcb) {
2701                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p,
2702                     *stcb, NULL);
2703         }
2704         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2705                 if (!had_a_existing_tcb ||
2706                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2707                         /*
2708                          * If we have a NEW cookie or the connect never
2709                          * reached the connected state during collision we
2710                          * must do the TCP accept thing.
2711                          */
2712                         struct socket *so, *oso;
2713                         struct sctp_inpcb *inp;
2714
2715                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2716                                 /*
2717                                  * For a restart we will keep the same
2718                                  * socket, no need to do anything. I THINK!!
2719                                  */
2720                                 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED);
2721                                 if (send_int_conf) {
2722                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2723                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2724                                 }
2725                                 return (m);
2726                         }
2727                         oso = (*inp_p)->sctp_socket;
2728                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2729                         SCTP_TCB_UNLOCK((*stcb));
2730                         CURVNET_SET(oso->so_vnet);
2731                         so = sonewconn(oso, 0
2732                             );
2733                         CURVNET_RESTORE();
2734                         SCTP_TCB_LOCK((*stcb));
2735                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2736
2737                         if (so == NULL) {
2738                                 struct mbuf *op_err;
2739
2740 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2741                                 struct socket *pcb_so;
2742
2743 #endif
2744                                 /* Too many sockets */
2745                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2746                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2747                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2748                                     sh, op_err, vrf_id, port);
2749 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2750                                 pcb_so = SCTP_INP_SO(*inp_p);
2751                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2752                                 SCTP_TCB_UNLOCK((*stcb));
2753                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2754                                 SCTP_TCB_LOCK((*stcb));
2755                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2756 #endif
2757                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2758 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2759                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2760 #endif
2761                                 return (NULL);
2762                         }
2763                         inp = (struct sctp_inpcb *)so->so_pcb;
2764                         SCTP_INP_INCR_REF(inp);
2765                         /*
2766                          * We add the unbound flag here so that if we get an
2767                          * soabort() before we get the move_pcb done, we
2768                          * will properly cleanup.
2769                          */
2770                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2771                             SCTP_PCB_FLAGS_CONNECTED |
2772                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2773                             SCTP_PCB_FLAGS_UNBOUND |
2774                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2775                             SCTP_PCB_FLAGS_DONT_WAKE);
2776                         inp->sctp_features = (*inp_p)->sctp_features;
2777                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2778                         inp->sctp_socket = so;
2779                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2780                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2781                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2782                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2783                         inp->sctp_context = (*inp_p)->sctp_context;
2784                         inp->inp_starting_point_for_iterator = NULL;
2785                         /*
2786                          * copy in the authentication parameters from the
2787                          * original endpoint
2788                          */
2789                         if (inp->sctp_ep.local_hmacs)
2790                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2791                         inp->sctp_ep.local_hmacs =
2792                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2793                         if (inp->sctp_ep.local_auth_chunks)
2794                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2795                         inp->sctp_ep.local_auth_chunks =
2796                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2797
2798                         /*
2799                          * Now we must move it from one hash table to
2800                          * another and get the tcb in the right place.
2801                          */
2802
2803                         /*
2804                          * This is where the one-2-one socket is put into
2805                          * the accept state waiting for the accept!
2806                          */
2807                         if (*stcb) {
2808                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2809                         }
2810                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2811
2812                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2813                         SCTP_TCB_UNLOCK((*stcb));
2814
2815                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2816                             0);
2817                         SCTP_TCB_LOCK((*stcb));
2818                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2819
2820
2821                         /*
2822                          * now we must check to see if we were aborted while
2823                          * the move was going on and the lock/unlock
2824                          * happened.
2825                          */
2826                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2827                                 /*
2828                                  * yep it was, we leave the assoc attached
2829                                  * to the socket since the sctp_inpcb_free()
2830                                  * call will send an abort for us.
2831                                  */
2832                                 SCTP_INP_DECR_REF(inp);
2833                                 return (NULL);
2834                         }
2835                         SCTP_INP_DECR_REF(inp);
2836                         /* Switch over to the new guy */
2837                         *inp_p = inp;
2838                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2839                         if (send_int_conf) {
2840                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2841                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2842                         }
2843                         /*
2844                          * Pull it from the incomplete queue and wake the
2845                          * guy
2846                          */
2847 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2848                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2849                         SCTP_TCB_UNLOCK((*stcb));
2850                         SCTP_SOCKET_LOCK(so, 1);
2851 #endif
2852                         soisconnected(so);
2853 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2854                         SCTP_TCB_LOCK((*stcb));
2855                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2856                         SCTP_SOCKET_UNLOCK(so, 1);
2857 #endif
2858                         return (m);
2859                 }
2860         }
2861         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2862                 if (notification) {
2863                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2864                 }
2865                 if (send_int_conf) {
2866                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2867                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2868                 }
2869         }
2870         return (m);
2871 }
2872
2873 static void
2874 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
2875     struct sctp_tcb *stcb, struct sctp_nets *net)
2876 {
2877         /* cp must not be used, others call this without a c-ack :-) */
2878         struct sctp_association *asoc;
2879
2880         SCTPDBG(SCTP_DEBUG_INPUT2,
2881             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2882         if (stcb == NULL)
2883                 return;
2884
2885         asoc = &stcb->asoc;
2886
2887         sctp_stop_all_cookie_timers(stcb);
2888         /* process according to association state */
2889         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2890                 /* state change only needed when I am in right state */
2891                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2892                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2893                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2894                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2895                             stcb->sctp_ep, stcb, asoc->primary_destination);
2896
2897                 }
2898                 /* update RTO */
2899                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2900                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2901                 if (asoc->overall_error_count == 0) {
2902                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2903                             &asoc->time_entered, sctp_align_safe_nocopy,
2904                             SCTP_RTT_FROM_NON_DATA);
2905                 }
2906                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2907                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2908                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2909                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2910 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2911                         struct socket *so;
2912
2913 #endif
2914                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2915 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2916                         so = SCTP_INP_SO(stcb->sctp_ep);
2917                         atomic_add_int(&stcb->asoc.refcnt, 1);
2918                         SCTP_TCB_UNLOCK(stcb);
2919                         SCTP_SOCKET_LOCK(so, 1);
2920                         SCTP_TCB_LOCK(stcb);
2921                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2922 #endif
2923                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2924                                 soisconnected(stcb->sctp_socket);
2925                         }
2926 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2927                         SCTP_SOCKET_UNLOCK(so, 1);
2928 #endif
2929                 }
2930                 /*
2931                  * since we did not send a HB make sure we don't double
2932                  * things
2933                  */
2934                 net->hb_responded = 1;
2935
2936                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2937                         /*
2938                          * We don't need to do the asconf thing, nor hb or
2939                          * autoclose if the socket is closed.
2940                          */
2941                         goto closed_socket;
2942                 }
2943                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2944                     stcb, net);
2945
2946
2947                 if (stcb->asoc.sctp_autoclose_ticks &&
2948                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2949                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2950                             stcb->sctp_ep, stcb, NULL);
2951                 }
2952                 /*
2953                  * send ASCONF if parameters are pending and ASCONFs are
2954                  * allowed (eg. addresses changed when init/cookie echo were
2955                  * in flight)
2956                  */
2957                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2958                     (stcb->asoc.peer_supports_asconf) &&
2959                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2960 #ifdef SCTP_TIMER_BASED_ASCONF
2961                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2962                             stcb->sctp_ep, stcb,
2963                             stcb->asoc.primary_destination);
2964 #else
2965                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2966                             SCTP_ADDR_NOT_LOCKED);
2967 #endif
2968                 }
2969         }
2970 closed_socket:
2971         /* Toss the cookie if I can */
2972         sctp_toss_old_cookies(stcb, asoc);
2973         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2974                 /* Restart the timer if we have pending data */
2975                 struct sctp_tmit_chunk *chk;
2976
2977                 chk = TAILQ_FIRST(&asoc->sent_queue);
2978                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2979         }
2980 }
2981
2982 static void
2983 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2984     struct sctp_tcb *stcb)
2985 {
2986         struct sctp_nets *net;
2987         struct sctp_tmit_chunk *lchk;
2988         struct sctp_ecne_chunk bkup;
2989         uint8_t override_bit = 0;
2990         uint32_t tsn, window_data_tsn;
2991         int len;
2992         unsigned int pkt_cnt;
2993
2994         len = ntohs(cp->ch.chunk_length);
2995         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2996             (len != sizeof(struct old_sctp_ecne_chunk))) {
2997                 return;
2998         }
2999         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3000                 /* Its the old format */
3001                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3002                 bkup.num_pkts_since_cwr = htonl(1);
3003                 cp = &bkup;
3004         }
3005         SCTP_STAT_INCR(sctps_recvecne);
3006         tsn = ntohl(cp->tsn);
3007         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3008         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3009         if (lchk == NULL) {
3010                 window_data_tsn = stcb->asoc.sending_seq - 1;
3011         } else {
3012                 window_data_tsn = lchk->rec.data.TSN_seq;
3013         }
3014
3015         /* Find where it was sent to if possible. */
3016         net = NULL;
3017         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3018                 if (lchk->rec.data.TSN_seq == tsn) {
3019                         net = lchk->whoTo;
3020                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3021                         break;
3022                 }
3023                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3024                         break;
3025                 }
3026         }
3027         if (net == NULL) {
3028                 /*
3029                  * What to do. A previous send of a CWR was possibly lost.
3030                  * See how old it is, we may have it marked on the actual
3031                  * net.
3032                  */
3033                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3034                         if (tsn == net->last_cwr_tsn) {
3035                                 /* Found him, send it off */
3036                                 goto out;
3037                         }
3038                 }
3039                 /*
3040                  * If we reach here, we need to send a special CWR that says
3041                  * hey, we did this a long time ago and you lost the
3042                  * response.
3043                  */
3044                 net = TAILQ_FIRST(&stcb->asoc.nets);
3045                 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3046         }
3047 out:
3048         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3049             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3050                 /*
3051                  * JRS - Use the congestion control given in the pluggable
3052                  * CC module
3053                  */
3054                 int ocwnd;
3055
3056                 ocwnd = net->cwnd;
3057                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3058                 /*
3059                  * We reduce once every RTT. So we will only lower cwnd at
3060                  * the next sending seq i.e. the window_data_tsn
3061                  */
3062                 net->cwr_window_tsn = window_data_tsn;
3063                 net->ecn_ce_pkt_cnt += pkt_cnt;
3064                 net->lost_cnt = pkt_cnt;
3065                 net->last_cwr_tsn = tsn;
3066         } else {
3067                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3068                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3069                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3070                         /*
3071                          * Another loss in the same window update how many
3072                          * marks/packets lost we have had.
3073                          */
3074                         int cnt = 1;
3075
3076                         if (pkt_cnt > net->lost_cnt) {
3077                                 /* Should be the case */
3078                                 cnt = (pkt_cnt - net->lost_cnt);
3079                                 net->ecn_ce_pkt_cnt += cnt;
3080                         }
3081                         net->lost_cnt = pkt_cnt;
3082                         net->last_cwr_tsn = tsn;
3083                         /*
3084                          * Most CC functions will ignore this call, since we
3085                          * are in-window yet of the initial CE the peer saw.
3086                          */
3087                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3088                 }
3089         }
3090         /*
3091          * We always send a CWR this way if our previous one was lost our
3092          * peer will get an update, or if it is not time again to reduce we
3093          * still get the cwr to the peer. Note we set the override when we
3094          * could not find the TSN on the chunk or the destination network.
3095          */
3096         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3097 }
3098
3099 static void
3100 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3101 {
3102         /*
3103          * Here we get a CWR from the peer. We must look in the outqueue and
3104          * make sure that we have a covered ECNE in teh control chunk part.
3105          * If so remove it.
3106          */
3107         struct sctp_tmit_chunk *chk;
3108         struct sctp_ecne_chunk *ecne;
3109         int override;
3110         uint32_t cwr_tsn;
3111
3112         cwr_tsn = ntohl(cp->tsn);
3113
3114         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3115         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3116                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3117                         continue;
3118                 }
3119                 if ((override == 0) && (chk->whoTo != net)) {
3120                         /* Must be from the right src unless override is set */
3121                         continue;
3122                 }
3123                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3124                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3125                         /* this covers this ECNE, we can remove it */
3126                         stcb->asoc.ecn_echo_cnt_onq--;
3127                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3128                             sctp_next);
3129                         if (chk->data) {
3130                                 sctp_m_freem(chk->data);
3131                                 chk->data = NULL;
3132                         }
3133                         stcb->asoc.ctrl_queue_cnt--;
3134                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3135                         if (override == 0) {
3136                                 break;
3137                         }
3138                 }
3139         }
3140 }
3141
3142 static void
3143 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
3144     struct sctp_tcb *stcb, struct sctp_nets *net)
3145 {
3146         struct sctp_association *asoc;
3147
3148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3149         struct socket *so;
3150
3151 #endif
3152
3153         SCTPDBG(SCTP_DEBUG_INPUT2,
3154             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3155         if (stcb == NULL)
3156                 return;
3157
3158         asoc = &stcb->asoc;
3159         /* process according to association state */
3160         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3161                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3162                 SCTPDBG(SCTP_DEBUG_INPUT2,
3163                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3164                 SCTP_TCB_UNLOCK(stcb);
3165                 return;
3166         }
3167         /* notify upper layer protocol */
3168         if (stcb->sctp_socket) {
3169                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3170                 /* are the queues empty? they should be */
3171                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3172                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3173                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3174                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3175                 }
3176         }
3177         /* stop the timer */
3178         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3179         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3180         /* free the TCB */
3181         SCTPDBG(SCTP_DEBUG_INPUT2,
3182             "sctp_handle_shutdown_complete: calls free-asoc\n");
3183 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3184         so = SCTP_INP_SO(stcb->sctp_ep);
3185         atomic_add_int(&stcb->asoc.refcnt, 1);
3186         SCTP_TCB_UNLOCK(stcb);
3187         SCTP_SOCKET_LOCK(so, 1);
3188         SCTP_TCB_LOCK(stcb);
3189         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3190 #endif
3191         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3192 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3193         SCTP_SOCKET_UNLOCK(so, 1);
3194 #endif
3195         return;
3196 }
3197
3198 static int
3199 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3200     struct sctp_nets *net, uint8_t flg)
3201 {
3202         switch (desc->chunk_type) {
3203         case SCTP_DATA:
3204                 /* find the tsn to resend (possibly */
3205                 {
3206                         uint32_t tsn;
3207                         struct sctp_tmit_chunk *tp1;
3208
3209                         tsn = ntohl(desc->tsn_ifany);
3210                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3211                                 if (tp1->rec.data.TSN_seq == tsn) {
3212                                         /* found it */
3213                                         break;
3214                                 }
3215                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3216                                         /* not found */
3217                                         tp1 = NULL;
3218                                         break;
3219                                 }
3220                         }
3221                         if (tp1 == NULL) {
3222                                 /*
3223                                  * Do it the other way , aka without paying
3224                                  * attention to queue seq order.
3225                                  */
3226                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3227                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3228                                         if (tp1->rec.data.TSN_seq == tsn) {
3229                                                 /* found it */
3230                                                 break;
3231                                         }
3232                                 }
3233                         }
3234                         if (tp1 == NULL) {
3235                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3236                         }
3237                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3238                                 uint8_t *ddp;
3239
3240                                 if (((flg & SCTP_BADCRC) == 0) &&
3241                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3242                                         return (0);
3243                                 }
3244                                 if ((stcb->asoc.peers_rwnd == 0) &&
3245                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3246                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3247                                         return (0);
3248                                 }
3249                                 if (stcb->asoc.peers_rwnd == 0 &&
3250                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3251                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3252                                         return (0);
3253                                 }
3254                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3255                                     sizeof(struct sctp_data_chunk));
3256                                 {
3257                                         unsigned int iii;
3258
3259                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3260                                             iii++) {
3261                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3262                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3263                                                         return (-1);
3264                                                 }
3265                                         }
3266                                 }
3267
3268                                 if (tp1->do_rtt) {
3269                                         /*
3270                                          * this guy had a RTO calculation
3271                                          * pending on it, cancel it
3272                                          */
3273                                         if (tp1->whoTo->rto_needed == 0) {
3274                                                 tp1->whoTo->rto_needed = 1;
3275                                         }
3276                                         tp1->do_rtt = 0;
3277                                 }
3278                                 SCTP_STAT_INCR(sctps_pdrpmark);
3279                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3280                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3281                                 /*
3282                                  * mark it as if we were doing a FR, since
3283                                  * we will be getting gap ack reports behind
3284                                  * the info from the router.
3285                                  */
3286                                 tp1->rec.data.doing_fast_retransmit = 1;
3287                                 /*
3288                                  * mark the tsn with what sequences can
3289                                  * cause a new FR.
3290                                  */
3291                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3292                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3293                                 } else {
3294                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3295                                 }
3296
3297                                 /* restart the timer */
3298                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3299                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3300                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3301                                     stcb, tp1->whoTo);
3302
3303                                 /* fix counts and things */
3304                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3305                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3306                                             tp1->whoTo->flight_size,
3307                                             tp1->book_size,
3308                                             (uintptr_t) stcb,
3309                                             tp1->rec.data.TSN_seq);
3310                                 }
3311                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3312                                         sctp_flight_size_decrease(tp1);
3313                                         sctp_total_flight_decrease(stcb, tp1);
3314                                 }
3315                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3316                         } {
3317                                 /* audit code */
3318                                 unsigned int audit;
3319
3320                                 audit = 0;
3321                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3322                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3323                                                 audit++;
3324                                 }
3325                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3326                                     sctp_next) {
3327                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3328                                                 audit++;
3329                                 }
3330                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3331                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3332                                             audit, stcb->asoc.sent_queue_retran_cnt);
3333 #ifndef SCTP_AUDITING_ENABLED
3334                                         stcb->asoc.sent_queue_retran_cnt = audit;
3335 #endif
3336                                 }
3337                         }
3338                 }
3339                 break;
3340         case SCTP_ASCONF:
3341                 {
3342                         struct sctp_tmit_chunk *asconf;
3343
3344                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3345                             sctp_next) {
3346                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3347                                         break;
3348                                 }
3349                         }
3350                         if (asconf) {
3351                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3352                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3353                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3354                                 asconf->snd_count--;
3355                         }
3356                 }
3357                 break;
3358         case SCTP_INITIATION:
3359                 /* resend the INIT */
3360                 stcb->asoc.dropped_special_cnt++;
3361                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3362                         /*
3363                          * If we can get it in, in a few attempts we do
3364                          * this, otherwise we let the timer fire.
3365                          */
3366                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3367                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3368                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3369                 }
3370                 break;
3371         case SCTP_SELECTIVE_ACK:
3372         case SCTP_NR_SELECTIVE_ACK:
3373                 /* resend the sack */
3374                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3375                 break;
3376         case SCTP_HEARTBEAT_REQUEST:
3377                 /* resend a demand HB */
3378                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3379                         /*
3380                          * Only retransmit if we KNOW we wont destroy the
3381                          * tcb
3382                          */
3383                         (void)sctp_send_hb(stcb, 1, net, SCTP_SO_NOT_LOCKED);
3384                 }
3385                 break;
3386         case SCTP_SHUTDOWN:
3387                 sctp_send_shutdown(stcb, net);
3388                 break;
3389         case SCTP_SHUTDOWN_ACK:
3390                 sctp_send_shutdown_ack(stcb, net);
3391                 break;
3392         case SCTP_COOKIE_ECHO:
3393                 {
3394                         struct sctp_tmit_chunk *cookie;
3395
3396                         cookie = NULL;
3397                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3398                             sctp_next) {
3399                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3400                                         break;
3401                                 }
3402                         }
3403                         if (cookie) {
3404                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3405                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3406                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3407                                 sctp_stop_all_cookie_timers(stcb);
3408                         }
3409                 }
3410                 break;
3411         case SCTP_COOKIE_ACK:
3412                 sctp_send_cookie_ack(stcb);
3413                 break;
3414         case SCTP_ASCONF_ACK:
3415                 /* resend last asconf ack */
3416                 sctp_send_asconf_ack(stcb);
3417                 break;
3418         case SCTP_FORWARD_CUM_TSN:
3419                 send_forward_tsn(stcb, &stcb->asoc);
3420                 break;
3421                 /* can't do anything with these */
3422         case SCTP_PACKET_DROPPED:
3423         case SCTP_INITIATION_ACK:       /* this should not happen */
3424         case SCTP_HEARTBEAT_ACK:
3425         case SCTP_ABORT_ASSOCIATION:
3426         case SCTP_OPERATION_ERROR:
3427         case SCTP_SHUTDOWN_COMPLETE:
3428         case SCTP_ECN_ECHO:
3429         case SCTP_ECN_CWR:
3430         default:
3431                 break;
3432         }
3433         return (0);
3434 }
3435
3436 void
3437 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3438 {
3439         int i;
3440         uint16_t temp;
3441
3442         /*
3443          * We set things to 0xffff since this is the last delivered sequence
3444          * and we will be sending in 0 after the reset.
3445          */
3446
3447         if (number_entries) {
3448                 for (i = 0; i < number_entries; i++) {
3449                         temp = ntohs(list[i]);
3450                         if (temp >= stcb->asoc.streamincnt) {
3451                                 continue;
3452                         }
3453                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3454                 }
3455         } else {
3456                 list = NULL;
3457                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3458                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3459                 }
3460         }
3461         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3462 }
3463
3464 static void
3465 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3466 {
3467         int i;
3468
3469         if (number_entries == 0) {
3470                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3471                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3472                 }
3473         } else if (number_entries) {
3474                 for (i = 0; i < number_entries; i++) {
3475                         uint16_t temp;
3476
3477                         temp = ntohs(list[i]);
3478                         if (temp >= stcb->asoc.streamoutcnt) {
3479                                 /* no such stream */
3480                                 continue;
3481                         }
3482                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3483                 }
3484         }
3485         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3486 }
3487
3488
3489 struct sctp_stream_reset_out_request *
3490 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3491 {
3492         struct sctp_association *asoc;
3493         struct sctp_stream_reset_out_req *req;
3494         struct sctp_stream_reset_out_request *r;
3495         struct sctp_tmit_chunk *chk;
3496         int len, clen;
3497
3498         asoc = &stcb->asoc;
3499         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3500                 asoc->stream_reset_outstanding = 0;
3501                 return (NULL);
3502         }
3503         if (stcb->asoc.str_reset == NULL) {
3504                 asoc->stream_reset_outstanding = 0;
3505                 return (NULL);
3506         }
3507         chk = stcb->asoc.str_reset;
3508         if (chk->data == NULL) {
3509                 return (NULL);
3510         }
3511         if (bchk) {
3512                 /* he wants a copy of the chk pointer */
3513                 *bchk = chk;
3514         }
3515         clen = chk->send_size;
3516         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3517         r = &req->sr_req;
3518         if (ntohl(r->request_seq) == seq) {
3519                 /* found it */
3520                 return (r);
3521         }
3522         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3523         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3524                 /* move to the next one, there can only be a max of two */
3525                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3526                 if (ntohl(r->request_seq) == seq) {
3527                         return (r);
3528                 }
3529         }
3530         /* that seq is not here */
3531         return (NULL);
3532 }
3533
3534 static void
3535 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3536 {
3537         struct sctp_association *asoc;
3538         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3539
3540         if (stcb->asoc.str_reset == NULL) {
3541                 return;
3542         }
3543         asoc = &stcb->asoc;
3544
3545         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3546         TAILQ_REMOVE(&asoc->control_send_queue,
3547             chk,
3548             sctp_next);
3549         if (chk->data) {
3550                 sctp_m_freem(chk->data);
3551                 chk->data = NULL;
3552         }
3553         asoc->ctrl_queue_cnt--;
3554         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3555         /* sa_ignore NO_NULL_CHK */
3556         stcb->asoc.str_reset = NULL;
3557 }
3558
3559
3560 static int
3561 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3562     uint32_t seq, uint32_t action,
3563     struct sctp_stream_reset_response *respin)
3564 {
3565         uint16_t type;
3566         int lparm_len;
3567         struct sctp_association *asoc = &stcb->asoc;
3568         struct sctp_tmit_chunk *chk;
3569         struct sctp_stream_reset_out_request *srparam;
3570         int number_entries;
3571
3572         if (asoc->stream_reset_outstanding == 0) {
3573                 /* duplicate */
3574                 return (0);
3575         }
3576         if (seq == stcb->asoc.str_reset_seq_out) {
3577                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3578                 if (srparam) {
3579                         stcb->asoc.str_reset_seq_out++;
3580                         type = ntohs(srparam->ph.param_type);
3581                         lparm_len = ntohs(srparam->ph.param_length);
3582                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3583                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3584                                 asoc->stream_reset_out_is_outstanding = 0;
3585                                 if (asoc->stream_reset_outstanding)
3586                                         asoc->stream_reset_outstanding--;
3587                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3588                                         /* do it */
3589                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3590                                 } else {
3591                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3592                                 }
3593                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3594                                 /* Answered my request */
3595                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3596                                 if (asoc->stream_reset_outstanding)
3597                                         asoc->stream_reset_outstanding--;
3598                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
3599                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3600                                 }
3601                         } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3602                                 /* Ok we now may have more streams */
3603                                 if (asoc->stream_reset_outstanding)
3604                                         asoc->stream_reset_outstanding--;
3605                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3606                                         /* Put the new streams into effect */
3607                                         stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3608                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3609                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3610                                 } else {
3611                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3612                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3613                                 }
3614                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3615                                 /**
3616                                  * a) Adopt the new in tsn.
3617                                  * b) reset the map
3618                                  * c) Adopt the new out-tsn
3619                                  */
3620                                 struct sctp_stream_reset_response_tsn *resp;
3621                                 struct sctp_forward_tsn_chunk fwdtsn;
3622                                 int abort_flag = 0;
3623
3624                                 if (respin == NULL) {
3625                                         /* huh ? */
3626                                         return (0);
3627                                 }
3628                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3629                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3630                                         asoc->stream_reset_outstanding--;
3631                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3632                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3633                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3634                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3635                                         if (abort_flag) {
3636                                                 return (1);
3637                                         }
3638                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3639                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3640                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3641                                         }
3642                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3643                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3644                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3645
3646                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3647                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3648
3649                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3650                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3651
3652                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3653                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3654
3655                                 }
3656                         }
3657                         /* get rid of the request and get the request flags */
3658                         if (asoc->stream_reset_outstanding == 0) {
3659                                 sctp_clean_up_stream_reset(stcb);
3660                         }
3661                 }
3662         }
3663         return (0);
3664 }
3665
3666 static void
3667 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3668     struct sctp_tmit_chunk *chk,
3669     struct sctp_stream_reset_in_request *req, int trunc)
3670 {
3671         uint32_t seq;
3672         int len, i;
3673         int number_entries;
3674         uint16_t temp;
3675
3676         /*
3677          * peer wants me to send a str-reset to him for my outgoing seq's if
3678          * seq_in is right.
3679          */
3680         struct sctp_association *asoc = &stcb->asoc;
3681
3682         seq = ntohl(req->request_seq);
3683         if (asoc->str_reset_seq_in == seq) {
3684                 if (trunc) {
3685                         /* Can't do it, since they exceeded our buffer size  */
3686                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3687                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3688                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3689                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3690                         len = ntohs(req->ph.param_length);
3691                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3692                         for (i = 0; i < number_entries; i++) {
3693                                 temp = ntohs(req->list_of_streams[i]);
3694                                 req->list_of_streams[i] = temp;
3695                         }
3696                         /* move the reset action back one */
3697                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3698                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3699                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3700                             asoc->str_reset_seq_out,
3701                             seq, (asoc->sending_seq - 1));
3702                         asoc->stream_reset_out_is_outstanding = 1;
3703                         asoc->str_reset = chk;
3704                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3705                         stcb->asoc.stream_reset_outstanding++;
3706                 } else {
3707                         /* Can't do it, since we have sent one out */
3708                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3709                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3710                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3711                 }
3712                 asoc->str_reset_seq_in++;
3713         } else if (asoc->str_reset_seq_in - 1 == seq) {
3714                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3715         } else if (asoc->str_reset_seq_in - 2 == seq) {
3716                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3717         } else {
3718                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3719         }
3720 }
3721
3722 static int
3723 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3724     struct sctp_tmit_chunk *chk,
3725     struct sctp_stream_reset_tsn_request *req)
3726 {
3727         /* reset all in and out and update the tsn */
3728         /*
3729          * A) reset my str-seq's on in and out. B) Select a receive next,
3730          * and set cum-ack to it. Also process this selected number as a
3731          * fwd-tsn as well. C) set in the response my next sending seq.
3732          */
3733         struct sctp_forward_tsn_chunk fwdtsn;
3734         struct sctp_association *asoc = &stcb->asoc;
3735         int abort_flag = 0;
3736         uint32_t seq;
3737
3738         seq = ntohl(req->request_seq);
3739         if (asoc->str_reset_seq_in == seq) {
3740                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3741                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3742                 fwdtsn.ch.chunk_flags = 0;
3743                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3744                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3745                 if (abort_flag) {
3746                         return (1);
3747                 }
3748                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3749                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3750                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3751                 }
3752                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3753                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3754                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3755                 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3756                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3757                 atomic_add_int(&stcb->asoc.sending_seq, 1);
3758                 /* save off historical data for retrans */
3759                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3760                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3761                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3762                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3763
3764                 sctp_add_stream_reset_result_tsn(chk,
3765                     ntohl(req->request_seq),
3766                     SCTP_STREAM_RESET_PERFORMED,
3767                     stcb->asoc.sending_seq,
3768                     stcb->asoc.mapping_array_base_tsn);
3769                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3770                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3771                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3772                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3773
3774                 asoc->str_reset_seq_in++;
3775         } else if (asoc->str_reset_seq_in - 1 == seq) {
3776                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3777                     stcb->asoc.last_sending_seq[0],
3778                     stcb->asoc.last_base_tsnsent[0]
3779                     );
3780         } else if (asoc->str_reset_seq_in - 2 == seq) {
3781                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3782                     stcb->asoc.last_sending_seq[1],
3783                     stcb->asoc.last_base_tsnsent[1]
3784                     );
3785         } else {
3786                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3787         }
3788         return (0);
3789 }
3790
3791 static void
3792 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3793     struct sctp_tmit_chunk *chk,
3794     struct sctp_stream_reset_out_request *req, int trunc)
3795 {
3796         uint32_t seq, tsn;
3797         int number_entries, len;
3798         struct sctp_association *asoc = &stcb->asoc;
3799
3800         seq = ntohl(req->request_seq);
3801
3802         /* now if its not a duplicate we process it */
3803         if (asoc->str_reset_seq_in == seq) {
3804                 len = ntohs(req->ph.param_length);
3805                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3806                 /*
3807                  * the sender is resetting, handle the list issue.. we must
3808                  * a) verify if we can do the reset, if so no problem b) If
3809                  * we can't do the reset we must copy the request. c) queue
3810                  * it, and setup the data in processor to trigger it off
3811                  * when needed and dequeue all the queued data.
3812                  */
3813                 tsn = ntohl(req->send_reset_at_tsn);
3814
3815                 /* move the reset action back one */
3816                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3817                 if (trunc) {
3818                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3819                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3820                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3821                         /* we can do it now */
3822                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3823                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3824                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3825                 } else {
3826                         /*
3827                          * we must queue it up and thus wait for the TSN's
3828                          * to arrive that are at or before tsn
3829                          */
3830                         struct sctp_stream_reset_list *liste;
3831                         int siz;
3832
3833                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3834                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3835                             siz, SCTP_M_STRESET);
3836                         if (liste == NULL) {
3837                                 /* gak out of memory */
3838                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3839                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3840                                 return;
3841                         }
3842                         liste->tsn = tsn;
3843                         liste->number_entries = number_entries;
3844                         memcpy(&liste->req, req,
3845                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3846                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3847                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3848                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3849                 }
3850                 asoc->str_reset_seq_in++;
3851         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3852                 /*
3853                  * one seq back, just echo back last action since my
3854                  * response was lost.
3855                  */
3856                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3857         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3858                 /*
3859                  * two seq back, just echo back last action since my
3860                  * response was lost.
3861                  */
3862                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3863         } else {
3864                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3865         }
3866 }
3867
3868 static void
3869 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3870     struct sctp_stream_reset_add_strm *str_add)
3871 {
3872         /*
3873          * Peer is requesting to add more streams. If its within our
3874          * max-streams we will allow it.
3875          */
3876         uint16_t num_stream, i;
3877         uint32_t seq;
3878         struct sctp_association *asoc = &stcb->asoc;
3879         struct sctp_queued_to_read *ctl, *nctl;
3880
3881         /* Get the number. */
3882         seq = ntohl(str_add->request_seq);
3883         num_stream = ntohs(str_add->number_of_streams);
3884         /* Now what would be the new total? */
3885         if (asoc->str_reset_seq_in == seq) {
3886                 num_stream += stcb->asoc.streamincnt;
3887                 if (num_stream > stcb->asoc.max_inbound_streams) {
3888                         /* We must reject it they ask for to many */
3889         denied:
3890                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3891                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3892                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3893                 } else {
3894                         /* Ok, we can do that :-) */
3895                         struct sctp_stream_in *oldstrm;
3896
3897                         /* save off the old */
3898                         oldstrm = stcb->asoc.strmin;
3899                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3900                             (num_stream * sizeof(struct sctp_stream_in)),
3901                             SCTP_M_STRMI);
3902                         if (stcb->asoc.strmin == NULL) {
3903                                 stcb->asoc.strmin = oldstrm;
3904                                 goto denied;
3905                         }
3906                         /* copy off the old data */
3907                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3908                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3909                                 stcb->asoc.strmin[i].stream_no = i;
3910                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3911                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3912                                 /* now anything on those queues? */
3913                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3914                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3915                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3916                                 }
3917                         }
3918                         /* Init the new streams */
3919                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3920                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3921                                 stcb->asoc.strmin[i].stream_no = i;
3922                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3923                                 stcb->asoc.strmin[i].delivery_started = 0;
3924                         }
3925                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3926                         /* update the size */
3927                         stcb->asoc.streamincnt = num_stream;
3928                         /* Send the ack */
3929                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3930                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3931                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3932                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3933                             (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3934                 }
3935         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3936                 /*
3937                  * one seq back, just echo back last action since my
3938                  * response was lost.
3939                  */
3940                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3941         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3942                 /*
3943                  * two seq back, just echo back last action since my
3944                  * response was lost.
3945                  */
3946                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3947         } else {
3948                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3949
3950         }
3951 }
3952
3953 #ifdef __GNUC__
3954 __attribute__((noinline))
3955 #endif
3956         static int
3957             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3958         struct sctp_stream_reset_out_req *sr_req)
3959 {
3960         int chk_length, param_len, ptype;
3961         struct sctp_paramhdr pstore;
3962         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3963
3964         uint32_t seq;
3965         int num_req = 0;
3966         int trunc = 0;
3967         struct sctp_tmit_chunk *chk;
3968         struct sctp_chunkhdr *ch;
3969         struct sctp_paramhdr *ph;
3970         int ret_code = 0;
3971         int num_param = 0;
3972
3973         /* now it may be a reset or a reset-response */
3974         chk_length = ntohs(sr_req->ch.chunk_length);
3975
3976         /* setup for adding the response */
3977         sctp_alloc_a_chunk(stcb, chk);
3978         if (chk == NULL) {
3979                 return (ret_code);
3980         }
3981         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3982         chk->rec.chunk_id.can_take_data = 0;
3983         chk->asoc = &stcb->asoc;
3984         chk->no_fr_allowed = 0;
3985         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3986         chk->book_size_scale = 0;
3987         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
3988         if (chk->data == NULL) {
3989 strres_nochunk:
3990                 if (chk->data) {
3991                         sctp_m_freem(chk->data);
3992                         chk->data = NULL;
3993                 }
3994                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3995                 return (ret_code);
3996         }
3997         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3998
3999         /* setup chunk parameters */
4000         chk->sent = SCTP_DATAGRAM_UNSENT;
4001         chk->snd_count = 0;
4002         chk->whoTo = stcb->asoc.primary_destination;
4003         atomic_add_int(&chk->whoTo->ref_count, 1);
4004
4005         ch = mtod(chk->data, struct sctp_chunkhdr *);
4006         ch->chunk_type = SCTP_STREAM_RESET;
4007         ch->chunk_flags = 0;
4008         ch->chunk_length = htons(chk->send_size);
4009         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4010         offset += sizeof(struct sctp_chunkhdr);
4011         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4012                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4013                 if (ph == NULL)
4014                         break;
4015                 param_len = ntohs(ph->param_length);
4016                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4017                         /* bad param */
4018                         break;
4019                 }
4020                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4021                     (uint8_t *) & cstore);
4022                 ptype = ntohs(ph->param_type);
4023                 num_param++;
4024                 if (param_len > (int)sizeof(cstore)) {
4025                         trunc = 1;
4026                 } else {
4027                         trunc = 0;
4028                 }
4029
4030                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4031                         /* hit the max of parameters already sorry.. */
4032                         break;
4033                 }
4034                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4035                         struct sctp_stream_reset_out_request *req_out;
4036
4037                         req_out = (struct sctp_stream_reset_out_request *)ph;
4038                         num_req++;
4039                         if (stcb->asoc.stream_reset_outstanding) {
4040                                 seq = ntohl(req_out->response_seq);
4041                                 if (seq == stcb->asoc.str_reset_seq_out) {
4042                                         /* implicit ack */
4043                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
4044                                 }
4045                         }
4046                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4047                 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
4048                         struct sctp_stream_reset_add_strm *str_add;
4049
4050                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4051                         num_req++;
4052                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4053                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4054                         struct sctp_stream_reset_in_request *req_in;
4055
4056                         num_req++;
4057
4058                         req_in = (struct sctp_stream_reset_in_request *)ph;
4059
4060                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4061                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4062                         struct sctp_stream_reset_tsn_request *req_tsn;
4063
4064                         num_req++;
4065                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4066
4067                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4068                                 ret_code = 1;
4069                                 goto strres_nochunk;
4070                         }
4071                         /* no more */
4072                         break;
4073                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4074                         struct sctp_stream_reset_response *resp;
4075                         uint32_t result;
4076
4077                         resp = (struct sctp_stream_reset_response *)ph;
4078                         seq = ntohl(resp->response_seq);
4079                         result = ntohl(resp->result);
4080                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4081                                 ret_code = 1;
4082                                 goto strres_nochunk;
4083                         }
4084                 } else {
4085                         break;
4086                 }
4087                 offset += SCTP_SIZE32(param_len);
4088                 chk_length -= SCTP_SIZE32(param_len);
4089         }
4090         if (num_req == 0) {
4091                 /* we have no response free the stuff */
4092                 goto strres_nochunk;
4093         }
4094         /* ok we have a chunk to link in */
4095         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4096             chk,
4097             sctp_next);
4098         stcb->asoc.ctrl_queue_cnt++;
4099         return (ret_code);
4100 }
4101
4102 /*
4103  * Handle a router or endpoints report of a packet loss, there are two ways
4104  * to handle this, either we get the whole packet and must disect it
4105  * ourselves (possibly with truncation and or corruption) or it is a summary
4106  * from a middle box that did the disectting for us.
4107  */
4108 static void
4109 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4110     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4111 {
4112         uint32_t bottle_bw, on_queue;
4113         uint16_t trunc_len;
4114         unsigned int chlen;
4115         unsigned int at;
4116         struct sctp_chunk_desc desc;
4117         struct sctp_chunkhdr *ch;
4118
4119         chlen = ntohs(cp->ch.chunk_length);
4120         chlen -= sizeof(struct sctp_pktdrop_chunk);
4121         /* XXX possible chlen underflow */
4122         if (chlen == 0) {
4123                 ch = NULL;
4124                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4125                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4126         } else {
4127                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4128                 chlen -= sizeof(struct sctphdr);
4129                 /* XXX possible chlen underflow */
4130                 memset(&desc, 0, sizeof(desc));
4131         }
4132         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4133         if (trunc_len > limit) {
4134                 trunc_len = limit;
4135         }
4136         /* now the chunks themselves */
4137         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4138                 desc.chunk_type = ch->chunk_type;
4139                 /* get amount we need to move */
4140                 at = ntohs(ch->chunk_length);
4141                 if (at < sizeof(struct sctp_chunkhdr)) {
4142                         /* corrupt chunk, maybe at the end? */
4143                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4144                         break;
4145                 }
4146                 if (trunc_len == 0) {
4147                         /* we are supposed to have all of it */
4148                         if (at > chlen) {
4149                                 /* corrupt skip it */
4150                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4151                                 break;
4152                         }
4153                 } else {
4154                         /* is there enough of it left ? */
4155                         if (desc.chunk_type == SCTP_DATA) {
4156                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4157                                     sizeof(desc.data_bytes))) {
4158                                         break;
4159                                 }
4160                         } else {
4161                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4162                                         break;
4163                                 }
4164                         }
4165                 }
4166                 if (desc.chunk_type == SCTP_DATA) {
4167                         /* can we get out the tsn? */
4168                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4169                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4170
4171                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4172                                 /* yep */
4173                                 struct sctp_data_chunk *dcp;
4174                                 uint8_t *ddp;
4175                                 unsigned int iii;
4176
4177                                 dcp = (struct sctp_data_chunk *)ch;
4178                                 ddp = (uint8_t *) (dcp + 1);
4179                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4180                                         desc.data_bytes[iii] = ddp[iii];
4181                                 }
4182                                 desc.tsn_ifany = dcp->dp.tsn;
4183                         } else {
4184                                 /* nope we are done. */
4185                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4186                                 break;
4187                         }
4188                 } else {
4189                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4190                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4191                 }
4192
4193                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4194                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4195                         break;
4196                 }
4197                 if (SCTP_SIZE32(at) > chlen) {
4198                         break;
4199                 }
4200                 chlen -= SCTP_SIZE32(at);
4201                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4202                         /* done, none left */
4203                         break;
4204                 }
4205                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4206         }
4207         /* Now update any rwnd --- possibly */
4208         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4209                 /* From a peer, we get a rwnd report */
4210                 uint32_t a_rwnd;
4211
4212                 SCTP_STAT_INCR(sctps_pdrpfehos);
4213
4214                 bottle_bw = ntohl(cp->bottle_bw);
4215                 on_queue = ntohl(cp->current_onq);
4216                 if (bottle_bw && on_queue) {
4217                         /* a rwnd report is in here */
4218                         if (bottle_bw > on_queue)
4219                                 a_rwnd = bottle_bw - on_queue;
4220                         else
4221                                 a_rwnd = 0;
4222
4223                         if (a_rwnd == 0)
4224                                 stcb->asoc.peers_rwnd = 0;
4225                         else {
4226                                 if (a_rwnd > stcb->asoc.total_flight) {
4227                                         stcb->asoc.peers_rwnd =
4228                                             a_rwnd - stcb->asoc.total_flight;
4229                                 } else {
4230                                         stcb->asoc.peers_rwnd = 0;
4231                                 }
4232                                 if (stcb->asoc.peers_rwnd <
4233                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4234                                         /* SWS sender side engages */
4235                                         stcb->asoc.peers_rwnd = 0;
4236                                 }
4237                         }
4238                 }
4239         } else {
4240                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4241         }
4242
4243         /* now middle boxes in sat networks get a cwnd bump */
4244         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4245             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4246             (stcb->asoc.sat_network)) {
4247                 /*
4248                  * This is debateable but for sat networks it makes sense
4249                  * Note if a T3 timer has went off, we will prohibit any
4250                  * changes to cwnd until we exit the t3 loss recovery.
4251                  */
4252                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4253                     net, cp, &bottle_bw, &on_queue);
4254         }
4255 }
4256
4257 /*
4258  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4259  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4260  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4261  * length of the complete packet outputs: - length: modified to remaining
4262  * length after control processing - netp: modified to new sctp_nets after
4263  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4264  * bad packet,...) otherwise return the tcb for this packet
4265  */
4266 #ifdef __GNUC__
4267 __attribute__((noinline))
4268 #endif
4269         static struct sctp_tcb *
4270                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4271              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4272              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4273              uint32_t vrf_id, uint16_t port)
4274 {
4275         struct sctp_association *asoc;
4276         uint32_t vtag_in;
4277         int num_chunks = 0;     /* number of control chunks processed */
4278         uint32_t chk_length;
4279         int ret;
4280         int abort_no_unlock = 0;
4281         int ecne_seen = 0;
4282
4283         /*
4284          * How big should this be, and should it be alloc'd? Lets try the
4285          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4286          * until we get into jumbo grams and such..
4287          */
4288         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4289         struct sctp_tcb *locked_tcb = stcb;
4290         int got_auth = 0;
4291         uint32_t auth_offset = 0, auth_len = 0;
4292         int auth_skipped = 0;
4293         int asconf_cnt = 0;
4294
4295 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4296         struct socket *so;
4297
4298 #endif
4299
4300         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4301             iphlen, *offset, length, stcb);
4302
4303         /* validate chunk header length... */
4304         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4305                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4306                     ntohs(ch->chunk_length));
4307                 if (locked_tcb) {
4308                         SCTP_TCB_UNLOCK(locked_tcb);
4309                 }
4310                 return (NULL);
4311         }
4312         /*
4313          * validate the verification tag
4314          */
4315         vtag_in = ntohl(sh->v_tag);
4316
4317         if (locked_tcb) {
4318                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4319         }
4320         if (ch->chunk_type == SCTP_INITIATION) {
4321                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4322                     ntohs(ch->chunk_length), vtag_in);
4323                 if (vtag_in != 0) {
4324                         /* protocol error- silently discard... */
4325                         SCTP_STAT_INCR(sctps_badvtag);
4326                         if (locked_tcb) {
4327                                 SCTP_TCB_UNLOCK(locked_tcb);
4328                         }
4329                         return (NULL);
4330                 }
4331         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4332                 /*
4333                  * If there is no stcb, skip the AUTH chunk and process
4334                  * later after a stcb is found (to validate the lookup was
4335                  * valid.
4336                  */
4337                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4338                     (stcb == NULL) &&
4339                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4340                         /* save this chunk for later processing */
4341                         auth_skipped = 1;
4342                         auth_offset = *offset;
4343                         auth_len = ntohs(ch->chunk_length);
4344
4345                         /* (temporarily) move past this chunk */
4346                         *offset += SCTP_SIZE32(auth_len);
4347                         if (*offset >= length) {
4348                                 /* no more data left in the mbuf chain */
4349                                 *offset = length;
4350                                 if (locked_tcb) {
4351                                         SCTP_TCB_UNLOCK(locked_tcb);
4352                                 }
4353                                 return (NULL);
4354                         }
4355                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4356                             sizeof(struct sctp_chunkhdr), chunk_buf);
4357                 }
4358                 if (ch == NULL) {
4359                         /* Help */
4360                         *offset = length;
4361                         if (locked_tcb) {
4362                                 SCTP_TCB_UNLOCK(locked_tcb);
4363                         }
4364                         return (NULL);
4365                 }
4366                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4367                         goto process_control_chunks;
4368                 }
4369                 /*
4370                  * first check if it's an ASCONF with an unknown src addr we
4371                  * need to look inside to find the association
4372                  */
4373                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4374                         struct sctp_chunkhdr *asconf_ch = ch;
4375                         uint32_t asconf_offset = 0, asconf_len = 0;
4376
4377                         /* inp's refcount may be reduced */
4378                         SCTP_INP_INCR_REF(inp);
4379
4380                         asconf_offset = *offset;
4381                         do {
4382                                 asconf_len = ntohs(asconf_ch->chunk_length);
4383                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4384                                         break;
4385                                 stcb = sctp_findassociation_ep_asconf(m, iphlen,
4386                                     *offset, sh, &inp, netp, vrf_id);
4387                                 if (stcb != NULL)
4388                                         break;
4389                                 asconf_offset += SCTP_SIZE32(asconf_len);
4390                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4391                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4392                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4393                         if (stcb == NULL) {
4394                                 /*
4395                                  * reduce inp's refcount if not reduced in
4396                                  * sctp_findassociation_ep_asconf().
4397                                  */
4398                                 SCTP_INP_DECR_REF(inp);
4399                         } else {
4400                                 locked_tcb = stcb;
4401                         }
4402
4403                         /* now go back and verify any auth chunk to be sure */
4404                         if (auth_skipped && (stcb != NULL)) {
4405                                 struct sctp_auth_chunk *auth;
4406
4407                                 auth = (struct sctp_auth_chunk *)
4408                                     sctp_m_getptr(m, auth_offset,
4409                                     auth_len, chunk_buf);
4410                                 got_auth = 1;
4411                                 auth_skipped = 0;
4412                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4413                                     auth_offset)) {
4414                                         /* auth HMAC failed so dump it */
4415                                         *offset = length;
4416                                         if (locked_tcb) {
4417                                                 SCTP_TCB_UNLOCK(locked_tcb);
4418                                         }
4419                                         return (NULL);
4420                                 } else {
4421                                         /* remaining chunks are HMAC checked */
4422                                         stcb->asoc.authenticated = 1;
4423                                 }
4424                         }
4425                 }
4426                 if (stcb == NULL) {
4427                         /* no association, so it's out of the blue... */
4428                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4429                             vrf_id, port);
4430                         *offset = length;
4431                         if (locked_tcb) {
4432                                 SCTP_TCB_UNLOCK(locked_tcb);
4433                         }
4434                         return (NULL);
4435                 }
4436                 asoc = &stcb->asoc;
4437                 /* ABORT and SHUTDOWN can use either v_tag... */
4438                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4439                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4440                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4441                         if ((vtag_in == asoc->my_vtag) ||
4442                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4443                             (vtag_in == asoc->peer_vtag))) {
4444                                 /* this is valid */
4445                         } else {
4446                                 /* drop this packet... */
4447                                 SCTP_STAT_INCR(sctps_badvtag);
4448                                 if (locked_tcb) {
4449                                         SCTP_TCB_UNLOCK(locked_tcb);
4450                                 }
4451                                 return (NULL);
4452                         }
4453                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4454                         if (vtag_in != asoc->my_vtag) {
4455                                 /*
4456                                  * this could be a stale SHUTDOWN-ACK or the
4457                                  * peer never got the SHUTDOWN-COMPLETE and
4458                                  * is still hung; we have started a new asoc
4459                                  * but it won't complete until the shutdown
4460                                  * is completed
4461                                  */
4462                                 if (locked_tcb) {
4463                                         SCTP_TCB_UNLOCK(locked_tcb);
4464                                 }
4465                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4466                                     NULL, vrf_id, port);
4467                                 return (NULL);
4468                         }
4469                 } else {
4470                         /* for all other chunks, vtag must match */
4471                         if (vtag_in != asoc->my_vtag) {
4472                                 /* invalid vtag... */
4473                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4474                                     "invalid vtag: %xh, expect %xh\n",
4475                                     vtag_in, asoc->my_vtag);
4476                                 SCTP_STAT_INCR(sctps_badvtag);
4477                                 if (locked_tcb) {
4478                                         SCTP_TCB_UNLOCK(locked_tcb);
4479                                 }
4480                                 *offset = length;
4481                                 return (NULL);
4482                         }
4483                 }
4484         }                       /* end if !SCTP_COOKIE_ECHO */
4485         /*
4486          * process all control chunks...
4487          */
4488         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4489         /* EY */
4490             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4491             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4492             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4493                 /* implied cookie-ack.. we must have lost the ack */
4494                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4495                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4496                             stcb->asoc.overall_error_count,
4497                             0,
4498                             SCTP_FROM_SCTP_INPUT,
4499                             __LINE__);
4500                 }
4501                 stcb->asoc.overall_error_count = 0;
4502                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4503                     *netp);
4504         }
4505 process_control_chunks:
4506         while (IS_SCTP_CONTROL(ch)) {
4507                 /* validate chunk length */
4508                 chk_length = ntohs(ch->chunk_length);
4509                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4510                     ch->chunk_type, chk_length);
4511                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4512                 if (chk_length < sizeof(*ch) ||
4513                     (*offset + (int)chk_length) > length) {
4514                         *offset = length;
4515                         if (locked_tcb) {
4516                                 SCTP_TCB_UNLOCK(locked_tcb);
4517                         }
4518                         return (NULL);
4519                 }
4520                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4521                 /*
4522                  * INIT-ACK only gets the init ack "header" portion only
4523                  * because we don't have to process the peer's COOKIE. All
4524                  * others get a complete chunk.
4525                  */
4526                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4527                     (ch->chunk_type == SCTP_INITIATION)) {
4528                         /* get an init-ack chunk */
4529                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4530                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4531                         if (ch == NULL) {
4532                                 *offset = length;
4533                                 if (locked_tcb) {
4534                                         SCTP_TCB_UNLOCK(locked_tcb);
4535                                 }
4536                                 return (NULL);
4537                         }
4538                 } else {
4539                         /* For cookies and all other chunks. */
4540                         if (chk_length > sizeof(chunk_buf)) {
4541                                 /*
4542                                  * use just the size of the chunk buffer so
4543                                  * the front part of our chunks fit in
4544                                  * contiguous space up to the chunk buffer
4545                                  * size (508 bytes). For chunks that need to
4546                                  * get more than that they must use the
4547                                  * sctp_m_getptr() function or other means
4548                                  * (e.g. know how to parse mbuf chains).
4549                                  * Cookies do this already.
4550                                  */
4551                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4552                                     (sizeof(chunk_buf) - 4),
4553                                     chunk_buf);
4554                                 if (ch == NULL) {
4555                                         *offset = length;
4556                                         if (locked_tcb) {
4557                                                 SCTP_TCB_UNLOCK(locked_tcb);
4558                                         }
4559                                         return (NULL);
4560                                 }
4561                         } else {
4562                                 /* We can fit it all */
4563                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4564                                     chk_length, chunk_buf);
4565                                 if (ch == NULL) {
4566                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4567                                         *offset = length;
4568                                         if (locked_tcb) {
4569                                                 SCTP_TCB_UNLOCK(locked_tcb);
4570                                         }
4571                                         return (NULL);
4572                                 }
4573                         }
4574                 }
4575                 num_chunks++;
4576                 /* Save off the last place we got a control from */
4577                 if (stcb != NULL) {
4578                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4579                                 /*
4580                                  * allow last_control to be NULL if
4581                                  * ASCONF... ASCONF processing will find the
4582                                  * right net later
4583                                  */
4584                                 if ((netp != NULL) && (*netp != NULL))
4585                                         stcb->asoc.last_control_chunk_from = *netp;
4586                         }
4587                 }
4588 #ifdef SCTP_AUDITING_ENABLED
4589                 sctp_audit_log(0xB0, ch->chunk_type);
4590 #endif
4591
4592                 /* check to see if this chunk required auth, but isn't */
4593                 if ((stcb != NULL) &&
4594                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4595                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4596                     !stcb->asoc.authenticated) {
4597                         /* "silently" ignore */
4598                         SCTP_STAT_INCR(sctps_recvauthmissing);
4599                         goto next_chunk;
4600                 }
4601                 switch (ch->chunk_type) {
4602                 case SCTP_INITIATION:
4603                         /* must be first and only chunk */
4604                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4605                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4606                                 /* We are not interested anymore? */
4607                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4608                                         /*
4609                                          * collision case where we are
4610                                          * sending to them too
4611                                          */
4612                                         ;
4613                                 } else {
4614                                         if (locked_tcb) {
4615                                                 SCTP_TCB_UNLOCK(locked_tcb);
4616                                         }
4617                                         *offset = length;
4618                                         return (NULL);
4619                                 }
4620                         }
4621                         if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4622                             (num_chunks > 1) ||
4623                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4624                                 *offset = length;
4625                                 if (locked_tcb) {
4626                                         SCTP_TCB_UNLOCK(locked_tcb);
4627                                 }
4628                                 return (NULL);
4629                         }
4630                         if ((stcb != NULL) &&
4631                             (SCTP_GET_STATE(&stcb->asoc) ==
4632                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4633                                 sctp_send_shutdown_ack(stcb,
4634                                     stcb->asoc.primary_destination);
4635                                 *offset = length;
4636                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4637                                 if (locked_tcb) {
4638                                         SCTP_TCB_UNLOCK(locked_tcb);
4639                                 }
4640                                 return (NULL);
4641                         }
4642                         if (netp) {
4643                                 sctp_handle_init(m, iphlen, *offset, sh,
4644                                     (struct sctp_init_chunk *)ch, inp,
4645                                     stcb, *netp, &abort_no_unlock, vrf_id, port);
4646                         }
4647                         if (abort_no_unlock)
4648                                 return (NULL);
4649
4650                         *offset = length;
4651                         if (locked_tcb) {
4652                                 SCTP_TCB_UNLOCK(locked_tcb);
4653                         }
4654                         return (NULL);
4655                         break;
4656                 case SCTP_PAD_CHUNK:
4657                         break;
4658                 case SCTP_INITIATION_ACK:
4659                         /* must be first and only chunk */
4660                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4661                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4662                                 /* We are not interested anymore */
4663                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4664                                         ;
4665                                 } else {
4666                                         if (locked_tcb != stcb) {
4667                                                 /* Very unlikely */
4668                                                 SCTP_TCB_UNLOCK(locked_tcb);
4669                                         }
4670                                         *offset = length;
4671                                         if (stcb) {
4672 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4673                                                 so = SCTP_INP_SO(inp);
4674                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4675                                                 SCTP_TCB_UNLOCK(stcb);
4676                                                 SCTP_SOCKET_LOCK(so, 1);
4677                                                 SCTP_TCB_LOCK(stcb);
4678                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4679 #endif
4680                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4681 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4682                                                 SCTP_SOCKET_UNLOCK(so, 1);
4683 #endif
4684                                         }
4685                                         return (NULL);
4686                                 }
4687                         }
4688                         if ((num_chunks > 1) ||
4689                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4690                                 *offset = length;
4691                                 if (locked_tcb) {
4692                                         SCTP_TCB_UNLOCK(locked_tcb);
4693                                 }
4694                                 return (NULL);
4695                         }
4696                         if ((netp) && (*netp)) {
4697                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4698                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4699                         } else {
4700                                 ret = -1;
4701                         }
4702                         /*
4703                          * Special case, I must call the output routine to
4704                          * get the cookie echoed
4705                          */
4706                         if (abort_no_unlock)
4707                                 return (NULL);
4708
4709                         if ((stcb) && ret == 0)
4710                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4711                         *offset = length;
4712                         if (locked_tcb) {
4713                                 SCTP_TCB_UNLOCK(locked_tcb);
4714                         }
4715                         return (NULL);
4716                         break;
4717                 case SCTP_SELECTIVE_ACK:
4718                         {
4719                                 struct sctp_sack_chunk *sack;
4720                                 int abort_now = 0;
4721                                 uint32_t a_rwnd, cum_ack;
4722                                 uint16_t num_seg, num_dup;
4723                                 uint8_t flags;
4724                                 int offset_seg, offset_dup;
4725
4726                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4727                                 SCTP_STAT_INCR(sctps_recvsacks);
4728                                 if (stcb == NULL) {
4729                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4730                                         break;
4731                                 }
4732                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4733                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4734                                         break;
4735                                 }
4736                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4737                                         /*-
4738                                          * If we have sent a shutdown-ack, we will pay no
4739                                          * attention to a sack sent in to us since
4740                                          * we don't care anymore.
4741                                          */
4742                                         break;
4743                                 }
4744                                 sack = (struct sctp_sack_chunk *)ch;
4745                                 flags = ch->chunk_flags;
4746                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4747                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4748                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4749                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4750                                 if (sizeof(struct sctp_sack_chunk) +
4751                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4752                                     num_dup * sizeof(uint32_t) != chk_length) {
4753                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4754                                         break;
4755                                 }
4756                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4757                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4758                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4759                                     cum_ack, num_seg, a_rwnd);
4760                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4761                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4762                                     (num_seg == 0) &&
4763                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4764                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4765                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4766                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4767                                     ) {
4768                                         /*
4769                                          * We have a SIMPLE sack having no
4770                                          * prior segments and data on sent
4771                                          * queue to be acked.. Use the
4772                                          * faster path sack processing. We
4773                                          * also allow window update sacks
4774                                          * with no missing segments to go
4775                                          * this way too.
4776                                          */
4777                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4778                                 } else {
4779                                         if (netp && *netp)
4780                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4781                                                     stcb, *netp,
4782                                                     num_seg, 0, num_dup, &abort_now, flags,
4783                                                     cum_ack, a_rwnd, ecne_seen);
4784                                 }
4785                                 if (abort_now) {
4786                                         /* ABORT signal from sack processing */
4787                                         *offset = length;
4788                                         return (NULL);
4789                                 }
4790                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4791                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4792                                     (stcb->asoc.stream_queue_cnt == 0)) {
4793                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4794                                 }
4795                         }
4796                         break;
4797                         /*
4798                          * EY - nr_sack:  If the received chunk is an
4799                          * nr_sack chunk
4800                          */
4801                 case SCTP_NR_SELECTIVE_ACK:
4802                         {
4803                                 struct sctp_nr_sack_chunk *nr_sack;
4804                                 int abort_now = 0;
4805                                 uint32_t a_rwnd, cum_ack;
4806                                 uint16_t num_seg, num_nr_seg, num_dup;
4807                                 uint8_t flags;
4808                                 int offset_seg, offset_dup;
4809
4810                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4811                                 SCTP_STAT_INCR(sctps_recvsacks);
4812                                 if (stcb == NULL) {
4813                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4814                                         break;
4815                                 }
4816                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4817                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4818                                         goto unknown_chunk;
4819                                 }
4820                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4821                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4822                                         break;
4823                                 }
4824                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4825                                         /*-
4826                                          * If we have sent a shutdown-ack, we will pay no
4827                                          * attention to a sack sent in to us since
4828                                          * we don't care anymore.
4829                                          */
4830                                         break;
4831                                 }
4832                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4833                                 flags = ch->chunk_flags;
4834                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4835                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4836                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4837                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4838                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4839                                 if (sizeof(struct sctp_nr_sack_chunk) +
4840                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4841                                     num_dup * sizeof(uint32_t) != chk_length) {
4842                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4843                                         break;
4844                                 }
4845                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4846                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4847                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4848                                     cum_ack, num_seg, a_rwnd);
4849                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4850                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4851                                     (num_seg == 0) && (num_nr_seg == 0) &&
4852                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4853                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4854                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4855                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4856                                         /*
4857                                          * We have a SIMPLE sack having no
4858                                          * prior segments and data on sent
4859                                          * queue to be acked. Use the faster
4860                                          * path sack processing. We also
4861                                          * allow window update sacks with no
4862                                          * missing segments to go this way
4863                                          * too.
4864                                          */
4865                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4866                                             &abort_now, ecne_seen);
4867                                 } else {
4868                                         if (netp && *netp)
4869                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4870                                                     stcb, *netp,
4871                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4872                                                     cum_ack, a_rwnd, ecne_seen);
4873                                 }
4874                                 if (abort_now) {
4875                                         /* ABORT signal from sack processing */
4876                                         *offset = length;
4877                                         return (NULL);
4878                                 }
4879                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4880                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4881                                     (stcb->asoc.stream_queue_cnt == 0)) {
4882                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4883                                 }
4884                         }
4885                         break;
4886
4887                 case SCTP_HEARTBEAT_REQUEST:
4888                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4889                         if ((stcb) && netp && *netp) {
4890                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4891                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4892                                     chk_length, *netp);
4893
4894                                 /* He's alive so give him credit */
4895                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4896                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4897                                             stcb->asoc.overall_error_count,
4898                                             0,
4899                                             SCTP_FROM_SCTP_INPUT,
4900                                             __LINE__);
4901                                 }
4902                                 stcb->asoc.overall_error_count = 0;
4903                         }
4904                         break;
4905                 case SCTP_HEARTBEAT_ACK:
4906                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4907                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4908                                 /* Its not ours */
4909                                 *offset = length;
4910                                 if (locked_tcb) {
4911                                         SCTP_TCB_UNLOCK(locked_tcb);
4912                                 }
4913                                 return (NULL);
4914                         }
4915                         /* He's alive so give him credit */
4916                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4917                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4918                                     stcb->asoc.overall_error_count,
4919                                     0,
4920                                     SCTP_FROM_SCTP_INPUT,
4921                                     __LINE__);
4922                         }
4923                         stcb->asoc.overall_error_count = 0;
4924                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4925                         if (netp && *netp)
4926                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4927                                     stcb, *netp);
4928                         break;
4929                 case SCTP_ABORT_ASSOCIATION:
4930                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4931                             stcb);
4932                         if ((stcb) && netp && *netp)
4933                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4934                                     stcb, *netp);
4935                         *offset = length;
4936                         return (NULL);
4937                         break;
4938                 case SCTP_SHUTDOWN:
4939                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4940                             stcb);
4941                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4942                                 *offset = length;
4943                                 if (locked_tcb) {
4944                                         SCTP_TCB_UNLOCK(locked_tcb);
4945                                 }
4946                                 return (NULL);
4947                         }
4948                         if (netp && *netp) {
4949                                 int abort_flag = 0;
4950
4951                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4952                                     stcb, *netp, &abort_flag);
4953                                 if (abort_flag) {
4954                                         *offset = length;
4955                                         return (NULL);
4956                                 }
4957                         }
4958                         break;
4959                 case SCTP_SHUTDOWN_ACK:
4960                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4961                         if ((stcb) && (netp) && (*netp))
4962                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4963                         *offset = length;
4964                         return (NULL);
4965                         break;
4966
4967                 case SCTP_OPERATION_ERROR:
4968                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4969                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4970
4971                                 *offset = length;
4972                                 return (NULL);
4973                         }
4974                         break;
4975                 case SCTP_COOKIE_ECHO:
4976                         SCTPDBG(SCTP_DEBUG_INPUT3,
4977                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4978                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4979                                 ;
4980                         } else {
4981                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4982                                         /* We are not interested anymore */
4983                         abend:
4984                                         if (stcb) {
4985                                                 SCTP_TCB_UNLOCK(stcb);
4986                                         }
4987                                         *offset = length;
4988                                         return (NULL);
4989                                 }
4990                         }
4991                         /*
4992                          * First are we accepting? We do this again here
4993                          * since it is possible that a previous endpoint WAS
4994                          * listening responded to a INIT-ACK and then
4995                          * closed. We opened and bound.. and are now no
4996                          * longer listening.
4997                          */
4998
4999                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5000                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5001                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5002                                         struct mbuf *oper;
5003                                         struct sctp_paramhdr *phdr;
5004
5005                                         oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5006                                             0, M_DONTWAIT, 1, MT_DATA);
5007                                         if (oper) {
5008                                                 SCTP_BUF_LEN(oper) =
5009                                                     sizeof(struct sctp_paramhdr);
5010                                                 phdr = mtod(oper,
5011                                                     struct sctp_paramhdr *);
5012                                                 phdr->param_type =
5013                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
5014                                                 phdr->param_length =
5015                                                     htons(sizeof(struct sctp_paramhdr));
5016                                         }
5017                                         sctp_abort_association(inp, stcb, m,
5018                                             iphlen, sh, oper, vrf_id, port);
5019                                 }
5020                                 *offset = length;
5021                                 return (NULL);
5022                         } else {
5023                                 struct mbuf *ret_buf;
5024                                 struct sctp_inpcb *linp;
5025
5026                                 if (stcb) {
5027                                         linp = NULL;
5028                                 } else {
5029                                         linp = inp;
5030                                 }
5031
5032                                 if (linp) {
5033                                         SCTP_ASOC_CREATE_LOCK(linp);
5034                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5035                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5036                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5037                                                 goto abend;
5038                                         }
5039                                 }
5040                                 if (netp) {
5041                                         ret_buf =
5042                                             sctp_handle_cookie_echo(m, iphlen,
5043                                             *offset, sh,
5044                                             (struct sctp_cookie_echo_chunk *)ch,
5045                                             &inp, &stcb, netp,
5046                                             auth_skipped,
5047                                             auth_offset,
5048                                             auth_len,
5049                                             &locked_tcb,
5050                                             vrf_id,
5051                                             port);
5052                                 } else {
5053                                         ret_buf = NULL;
5054                                 }
5055                                 if (linp) {
5056                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5057                                 }
5058                                 if (ret_buf == NULL) {
5059                                         if (locked_tcb) {
5060                                                 SCTP_TCB_UNLOCK(locked_tcb);
5061                                         }
5062                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5063                                             "GAK, null buffer\n");
5064                                         auth_skipped = 0;
5065                                         *offset = length;
5066                                         return (NULL);
5067                                 }
5068                                 /* if AUTH skipped, see if it verified... */
5069                                 if (auth_skipped) {
5070                                         got_auth = 1;
5071                                         auth_skipped = 0;
5072                                 }
5073                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5074                                         /*
5075                                          * Restart the timer if we have
5076                                          * pending data
5077                                          */
5078                                         struct sctp_tmit_chunk *chk;
5079
5080                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5081                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5082                                 }
5083                         }
5084                         break;
5085                 case SCTP_COOKIE_ACK:
5086                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5087                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5088                                 if (locked_tcb) {
5089                                         SCTP_TCB_UNLOCK(locked_tcb);
5090                                 }
5091                                 return (NULL);
5092                         }
5093                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5094                                 /* We are not interested anymore */
5095                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5096                                         ;
5097                                 } else if (stcb) {
5098 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5099                                         so = SCTP_INP_SO(inp);
5100                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5101                                         SCTP_TCB_UNLOCK(stcb);
5102                                         SCTP_SOCKET_LOCK(so, 1);
5103                                         SCTP_TCB_LOCK(stcb);
5104                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5105 #endif
5106                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5107 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5108                                         SCTP_SOCKET_UNLOCK(so, 1);
5109 #endif
5110                                         *offset = length;
5111                                         return (NULL);
5112                                 }
5113                         }
5114                         /* He's alive so give him credit */
5115                         if ((stcb) && netp && *netp) {
5116                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5117                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5118                                             stcb->asoc.overall_error_count,
5119                                             0,
5120                                             SCTP_FROM_SCTP_INPUT,
5121                                             __LINE__);
5122                                 }
5123                                 stcb->asoc.overall_error_count = 0;
5124                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5125                         }
5126                         break;
5127                 case SCTP_ECN_ECHO:
5128                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5129                         /* He's alive so give him credit */
5130                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5131                                 /* Its not ours */
5132                                 if (locked_tcb) {
5133                                         SCTP_TCB_UNLOCK(locked_tcb);
5134                                 }
5135                                 *offset = length;
5136                                 return (NULL);
5137                         }
5138                         if (stcb) {
5139                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5140                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5141                                             stcb->asoc.overall_error_count,
5142                                             0,
5143                                             SCTP_FROM_SCTP_INPUT,
5144                                             __LINE__);
5145                                 }
5146                                 stcb->asoc.overall_error_count = 0;
5147                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5148                                     stcb);
5149                                 ecne_seen = 1;
5150                         }
5151                         break;
5152                 case SCTP_ECN_CWR:
5153                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5154                         /* He's alive so give him credit */
5155                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5156                                 /* Its not ours */
5157                                 if (locked_tcb) {
5158                                         SCTP_TCB_UNLOCK(locked_tcb);
5159                                 }
5160                                 *offset = length;
5161                                 return (NULL);
5162                         }
5163                         if (stcb) {
5164                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5165                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5166                                             stcb->asoc.overall_error_count,
5167                                             0,
5168                                             SCTP_FROM_SCTP_INPUT,
5169                                             __LINE__);
5170                                 }
5171                                 stcb->asoc.overall_error_count = 0;
5172                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5173                         }
5174                         break;
5175                 case SCTP_SHUTDOWN_COMPLETE:
5176                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5177                         /* must be first and only chunk */
5178                         if ((num_chunks > 1) ||
5179                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5180                                 *offset = length;
5181                                 if (locked_tcb) {
5182                                         SCTP_TCB_UNLOCK(locked_tcb);
5183                                 }
5184                                 return (NULL);
5185                         }
5186                         if ((stcb) && netp && *netp) {
5187                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5188                                     stcb, *netp);
5189                         }
5190                         *offset = length;
5191                         return (NULL);
5192                         break;
5193                 case SCTP_ASCONF:
5194                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5195                         /* He's alive so give him credit */
5196                         if (stcb) {
5197                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5198                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5199                                             stcb->asoc.overall_error_count,
5200                                             0,
5201                                             SCTP_FROM_SCTP_INPUT,
5202                                             __LINE__);
5203                                 }
5204                                 stcb->asoc.overall_error_count = 0;
5205                                 sctp_handle_asconf(m, *offset,
5206                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5207                                 asconf_cnt++;
5208                         }
5209                         break;
5210                 case SCTP_ASCONF_ACK:
5211                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5212                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5213                                 /* Its not ours */
5214                                 if (locked_tcb) {
5215                                         SCTP_TCB_UNLOCK(locked_tcb);
5216                                 }
5217                                 *offset = length;
5218                                 return (NULL);
5219                         }
5220                         if ((stcb) && netp && *netp) {
5221                                 /* He's alive so give him credit */
5222                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5223                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5224                                             stcb->asoc.overall_error_count,
5225                                             0,
5226                                             SCTP_FROM_SCTP_INPUT,
5227                                             __LINE__);
5228                                 }
5229                                 stcb->asoc.overall_error_count = 0;
5230                                 sctp_handle_asconf_ack(m, *offset,
5231                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5232                                 if (abort_no_unlock)
5233                                         return (NULL);
5234                         }
5235                         break;
5236                 case SCTP_FORWARD_CUM_TSN:
5237                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5238                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5239                                 /* Its not ours */
5240                                 if (locked_tcb) {
5241                                         SCTP_TCB_UNLOCK(locked_tcb);
5242                                 }
5243                                 *offset = length;
5244                                 return (NULL);
5245                         }
5246                         /* He's alive so give him credit */
5247                         if (stcb) {
5248                                 int abort_flag = 0;
5249
5250                                 stcb->asoc.overall_error_count = 0;
5251                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5252                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5253                                             stcb->asoc.overall_error_count,
5254                                             0,
5255                                             SCTP_FROM_SCTP_INPUT,
5256                                             __LINE__);
5257                                 }
5258                                 *fwd_tsn_seen = 1;
5259                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5260                                         /* We are not interested anymore */
5261 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5262                                         so = SCTP_INP_SO(inp);
5263                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5264                                         SCTP_TCB_UNLOCK(stcb);
5265                                         SCTP_SOCKET_LOCK(so, 1);
5266                                         SCTP_TCB_LOCK(stcb);
5267                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5268 #endif
5269                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5270 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5271                                         SCTP_SOCKET_UNLOCK(so, 1);
5272 #endif
5273                                         *offset = length;
5274                                         return (NULL);
5275                                 }
5276                                 sctp_handle_forward_tsn(stcb,
5277                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5278                                 if (abort_flag) {
5279                                         *offset = length;
5280                                         return (NULL);
5281                                 } else {
5282                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5283                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5284                                                     stcb->asoc.overall_error_count,
5285                                                     0,
5286                                                     SCTP_FROM_SCTP_INPUT,
5287                                                     __LINE__);
5288                                         }
5289                                         stcb->asoc.overall_error_count = 0;
5290                                 }
5291
5292                         }
5293                         break;
5294                 case SCTP_STREAM_RESET:
5295                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5296                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5297                                 /* Its not ours */
5298                                 if (locked_tcb) {
5299                                         SCTP_TCB_UNLOCK(locked_tcb);
5300                                 }
5301                                 *offset = length;
5302                                 return (NULL);
5303                         }
5304                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5305                                 /* We are not interested anymore */
5306 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5307                                 so = SCTP_INP_SO(inp);
5308                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5309                                 SCTP_TCB_UNLOCK(stcb);
5310                                 SCTP_SOCKET_LOCK(so, 1);
5311                                 SCTP_TCB_LOCK(stcb);
5312                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5313 #endif
5314                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5315 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5316                                 SCTP_SOCKET_UNLOCK(so, 1);
5317 #endif
5318                                 *offset = length;
5319                                 return (NULL);
5320                         }
5321                         if (stcb->asoc.peer_supports_strreset == 0) {
5322                                 /*
5323                                  * hmm, peer should have announced this, but
5324                                  * we will turn it on since he is sending us
5325                                  * a stream reset.
5326                                  */
5327                                 stcb->asoc.peer_supports_strreset = 1;
5328                         }
5329                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5330                                 /* stop processing */
5331                                 *offset = length;
5332                                 return (NULL);
5333                         }
5334                         break;
5335                 case SCTP_PACKET_DROPPED:
5336                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5337                         /* re-get it all please */
5338                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5339                                 /* Its not ours */
5340                                 if (locked_tcb) {
5341                                         SCTP_TCB_UNLOCK(locked_tcb);
5342                                 }
5343                                 *offset = length;
5344                                 return (NULL);
5345                         }
5346                         if (ch && (stcb) && netp && (*netp)) {
5347                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5348                                     stcb, *netp,
5349                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5350
5351                         }
5352                         break;
5353
5354                 case SCTP_AUTHENTICATION:
5355                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5356                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5357                                 goto unknown_chunk;
5358
5359                         if (stcb == NULL) {
5360                                 /* save the first AUTH for later processing */
5361                                 if (auth_skipped == 0) {
5362                                         auth_offset = *offset;
5363                                         auth_len = chk_length;
5364                                         auth_skipped = 1;
5365                                 }
5366                                 /* skip this chunk (temporarily) */
5367                                 goto next_chunk;
5368                         }
5369                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5370                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5371                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5372                                 /* Its not ours */
5373                                 if (locked_tcb) {
5374                                         SCTP_TCB_UNLOCK(locked_tcb);
5375                                 }
5376                                 *offset = length;
5377                                 return (NULL);
5378                         }
5379                         if (got_auth == 1) {
5380                                 /* skip this chunk... it's already auth'd */
5381                                 goto next_chunk;
5382                         }
5383                         got_auth = 1;
5384                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5385                             m, *offset)) {
5386                                 /* auth HMAC failed so dump the packet */
5387                                 *offset = length;
5388                                 return (stcb);
5389                         } else {
5390                                 /* remaining chunks are HMAC checked */
5391                                 stcb->asoc.authenticated = 1;
5392                         }
5393                         break;
5394
5395                 default:
5396         unknown_chunk:
5397                         /* it's an unknown chunk! */
5398                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5399                                 struct mbuf *mm;
5400                                 struct sctp_paramhdr *phd;
5401
5402                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5403                                     0, M_DONTWAIT, 1, MT_DATA);
5404                                 if (mm) {
5405                                         phd = mtod(mm, struct sctp_paramhdr *);
5406                                         /*
5407                                          * We cheat and use param type since
5408                                          * we did not bother to define a
5409                                          * error cause struct. They are the
5410                                          * same basic format with different
5411                                          * names.
5412                                          */
5413                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5414                                         phd->param_length = htons(chk_length + sizeof(*phd));
5415                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5416                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5417                                             M_DONTWAIT);
5418                                         if (SCTP_BUF_NEXT(mm)) {
5419 #ifdef SCTP_MBUF_LOGGING
5420                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5421                                                         struct mbuf *mat;
5422
5423                                                         mat = SCTP_BUF_NEXT(mm);
5424                                                         while (mat) {
5425                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5426                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5427                                                                 }
5428                                                                 mat = SCTP_BUF_NEXT(mat);
5429                                                         }
5430                                                 }
5431 #endif
5432                                                 sctp_queue_op_err(stcb, mm);
5433                                         } else {
5434                                                 sctp_m_freem(mm);
5435                                         }
5436                                 }
5437                         }
5438                         if ((ch->chunk_type & 0x80) == 0) {
5439                                 /* discard this packet */
5440                                 *offset = length;
5441                                 return (stcb);
5442                         }       /* else skip this bad chunk and continue... */
5443                         break;
5444                 }               /* switch (ch->chunk_type) */
5445
5446
5447 next_chunk:
5448                 /* get the next chunk */
5449                 *offset += SCTP_SIZE32(chk_length);
5450                 if (*offset >= length) {
5451                         /* no more data left in the mbuf chain */
5452                         break;
5453                 }
5454                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5455                     sizeof(struct sctp_chunkhdr), chunk_buf);
5456                 if (ch == NULL) {
5457                         if (locked_tcb) {
5458                                 SCTP_TCB_UNLOCK(locked_tcb);
5459                         }
5460                         *offset = length;
5461                         return (NULL);
5462                 }
5463         }                       /* while */
5464
5465         if (asconf_cnt > 0 && stcb != NULL) {
5466                 sctp_send_asconf_ack(stcb);
5467         }
5468         return (stcb);
5469 }
5470
5471
5472 #ifdef INVARIANTS
5473 #ifdef __GNUC__
5474 __attribute__((noinline))
5475 #endif
5476         void
5477              sctp_validate_no_locks(struct sctp_inpcb *inp)
5478 {
5479         struct sctp_tcb *lstcb;
5480
5481         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5482                 if (mtx_owned(&lstcb->tcb_mtx)) {
5483                         panic("Own lock on stcb at return from input");
5484                 }
5485         }
5486         if (mtx_owned(&inp->inp_create_mtx)) {
5487                 panic("Own create lock on inp");
5488         }
5489         if (mtx_owned(&inp->inp_mtx)) {
5490                 panic("Own inp lock on inp");
5491         }
5492 }
5493
5494 #endif
5495
5496 /*
5497  * common input chunk processing (v4 and v6)
5498  */
5499 void
5500 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5501     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5502     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5503     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5504 {
5505         /*
5506          * Control chunk processing
5507          */
5508         uint32_t high_tsn;
5509         int fwd_tsn_seen = 0, data_processed = 0;
5510         struct mbuf *m = *mm;
5511         int abort_flag = 0;
5512         int un_sent;
5513         int cnt_ctrl_ready = 0;
5514
5515         SCTP_STAT_INCR(sctps_recvdatagrams);
5516 #ifdef SCTP_AUDITING_ENABLED
5517         sctp_audit_log(0xE0, 1);
5518         sctp_auditing(0, inp, stcb, net);
5519 #endif
5520
5521         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5522             m, iphlen, offset, length, stcb);
5523         if (stcb) {
5524                 /* always clear this before beginning a packet */
5525                 stcb->asoc.authenticated = 0;
5526                 stcb->asoc.seen_a_sack_this_pkt = 0;
5527                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5528                     stcb, stcb->asoc.state);
5529
5530                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5531                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5532                         /*-
5533                          * If we hit here, we had a ref count
5534                          * up when the assoc was aborted and the
5535                          * timer is clearing out the assoc, we should
5536                          * NOT respond to any packet.. its OOTB.
5537                          */
5538                         SCTP_TCB_UNLOCK(stcb);
5539                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5540                             vrf_id, port);
5541                         goto out_now;
5542                 }
5543         }
5544         if (IS_SCTP_CONTROL(ch)) {
5545                 /* process the control portion of the SCTP packet */
5546                 /* sa_ignore NO_NULL_CHK */
5547                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5548                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5549                 if (stcb) {
5550                         /*
5551                          * This covers us if the cookie-echo was there and
5552                          * it changes our INP.
5553                          */
5554                         inp = stcb->sctp_ep;
5555                         if ((net) && (port)) {
5556                                 if (net->port == 0) {
5557                                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5558                                 }
5559                                 net->port = port;
5560                         }
5561                 }
5562         } else {
5563                 /*
5564                  * no control chunks, so pre-process DATA chunks (these
5565                  * checks are taken care of by control processing)
5566                  */
5567
5568                 /*
5569                  * if DATA only packet, and auth is required, then punt...
5570                  * can't have authenticated without any AUTH (control)
5571                  * chunks
5572                  */
5573                 if ((stcb != NULL) &&
5574                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5575                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5576                         /* "silently" ignore */
5577                         SCTP_STAT_INCR(sctps_recvauthmissing);
5578                         SCTP_TCB_UNLOCK(stcb);
5579                         goto out_now;
5580                 }
5581                 if (stcb == NULL) {
5582                         /* out of the blue DATA chunk */
5583                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5584                             vrf_id, port);
5585                         goto out_now;
5586                 }
5587                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5588                         /* v_tag mismatch! */
5589                         SCTP_STAT_INCR(sctps_badvtag);
5590                         SCTP_TCB_UNLOCK(stcb);
5591                         goto out_now;
5592                 }
5593         }
5594
5595         if (stcb == NULL) {
5596                 /*
5597                  * no valid TCB for this packet, or we found it's a bad
5598                  * packet while processing control, or we're done with this
5599                  * packet (done or skip rest of data), so we drop it...
5600                  */
5601                 goto out_now;
5602         }
5603         /*
5604          * DATA chunk processing
5605          */
5606         /* plow through the data chunks while length > offset */
5607
5608         /*
5609          * Rest should be DATA only.  Check authentication state if AUTH for
5610          * DATA is required.
5611          */
5612         if ((length > offset) &&
5613             (stcb != NULL) &&
5614             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5615             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5616             !stcb->asoc.authenticated) {
5617                 /* "silently" ignore */
5618                 SCTP_STAT_INCR(sctps_recvauthmissing);
5619                 SCTPDBG(SCTP_DEBUG_AUTH1,
5620                     "Data chunk requires AUTH, skipped\n");
5621                 goto trigger_send;
5622         }
5623         if (length > offset) {
5624                 int retval;
5625
5626                 /*
5627                  * First check to make sure our state is correct. We would
5628                  * not get here unless we really did have a tag, so we don't
5629                  * abort if this happens, just dump the chunk silently.
5630                  */
5631                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5632                 case SCTP_STATE_COOKIE_ECHOED:
5633                         /*
5634                          * we consider data with valid tags in this state
5635                          * shows us the cookie-ack was lost. Imply it was
5636                          * there.
5637                          */
5638                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5639                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5640                                     stcb->asoc.overall_error_count,
5641                                     0,
5642                                     SCTP_FROM_SCTP_INPUT,
5643                                     __LINE__);
5644                         }
5645                         stcb->asoc.overall_error_count = 0;
5646                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5647                         break;
5648                 case SCTP_STATE_COOKIE_WAIT:
5649                         /*
5650                          * We consider OOTB any data sent during asoc setup.
5651                          */
5652                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5653                             vrf_id, port);
5654                         SCTP_TCB_UNLOCK(stcb);
5655                         goto out_now;
5656                         /* sa_ignore NOTREACHED */
5657                         break;
5658                 case SCTP_STATE_EMPTY:  /* should not happen */
5659                 case SCTP_STATE_INUSE:  /* should not happen */
5660                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5661                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5662                 default:
5663                         SCTP_TCB_UNLOCK(stcb);
5664                         goto out_now;
5665                         /* sa_ignore NOTREACHED */
5666                         break;
5667                 case SCTP_STATE_OPEN:
5668                 case SCTP_STATE_SHUTDOWN_SENT:
5669                         break;
5670                 }
5671                 /* plow through the data chunks while length > offset */
5672                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5673                     inp, stcb, net, &high_tsn);
5674                 if (retval == 2) {
5675                         /*
5676                          * The association aborted, NO UNLOCK needed since
5677                          * the association is destroyed.
5678                          */
5679                         goto out_now;
5680                 }
5681                 data_processed = 1;
5682                 /*
5683                  * Anything important needs to have been m_copy'ed in
5684                  * process_data
5685                  */
5686         }
5687         /* take care of ecn */
5688         if ((stcb->asoc.ecn_allowed == 1) &&
5689             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5690                 /* Yep, we need to add a ECNE */
5691                 sctp_send_ecn_echo(stcb, net, high_tsn);
5692         }
5693         if ((data_processed == 0) && (fwd_tsn_seen)) {
5694                 int was_a_gap;
5695                 uint32_t highest_tsn;
5696
5697                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5698                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5699                 } else {
5700                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5701                 }
5702                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5703                 stcb->asoc.send_sack = 1;
5704                 sctp_sack_check(stcb, was_a_gap, &abort_flag);
5705                 if (abort_flag) {
5706                         /* Again, we aborted so NO UNLOCK needed */
5707                         goto out_now;
5708                 }
5709         } else if (fwd_tsn_seen) {
5710                 stcb->asoc.send_sack = 1;
5711         }
5712         /* trigger send of any chunks in queue... */
5713 trigger_send:
5714 #ifdef SCTP_AUDITING_ENABLED
5715         sctp_audit_log(0xE0, 2);
5716         sctp_auditing(1, inp, stcb, net);
5717 #endif
5718         SCTPDBG(SCTP_DEBUG_INPUT1,
5719             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5720             stcb->asoc.peers_rwnd,
5721             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5722             stcb->asoc.total_flight);
5723         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5724         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5725                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5726         }
5727         if (cnt_ctrl_ready ||
5728             ((un_sent) &&
5729             (stcb->asoc.peers_rwnd > 0 ||
5730             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5731                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5732                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5733                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5734         }
5735 #ifdef SCTP_AUDITING_ENABLED
5736         sctp_audit_log(0xE0, 3);
5737         sctp_auditing(2, inp, stcb, net);
5738 #endif
5739         SCTP_TCB_UNLOCK(stcb);
5740 out_now:
5741 #ifdef INVARIANTS
5742         sctp_validate_no_locks(inp);
5743 #endif
5744         return;
5745 }
5746
5747 #if 0
5748 static void
5749 sctp_print_mbuf_chain(struct mbuf *m)
5750 {
5751         for (; m; m = SCTP_BUF_NEXT(m)) {
5752                 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5753                 if (SCTP_BUF_IS_EXTENDED(m))
5754                         printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5755         }
5756 }
5757
5758 #endif
5759
5760 #ifdef INET
5761 void
5762 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5763 {
5764 #ifdef SCTP_MBUF_LOGGING
5765         struct mbuf *mat;
5766
5767 #endif
5768         struct mbuf *m;
5769         int iphlen;
5770         uint32_t vrf_id = 0;
5771         uint8_t ecn_bits;
5772         struct ip *ip;
5773         struct sctphdr *sh;
5774         struct sctp_inpcb *inp = NULL;
5775         struct sctp_nets *net;
5776         struct sctp_tcb *stcb = NULL;
5777         struct sctp_chunkhdr *ch;
5778         int refcount_up = 0;
5779         int length, mlen, offset;
5780
5781 #if !defined(SCTP_WITH_NO_CSUM)
5782         uint32_t check, calc_check;
5783
5784 #endif
5785
5786         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5787                 SCTP_RELEASE_PKT(i_pak);
5788                 return;
5789         }
5790         mlen = SCTP_HEADER_LEN(i_pak);
5791         iphlen = off;
5792         m = SCTP_HEADER_TO_CHAIN(i_pak);
5793
5794         net = NULL;
5795         SCTP_STAT_INCR(sctps_recvpackets);
5796         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5797
5798
5799 #ifdef SCTP_MBUF_LOGGING
5800         /* Log in any input mbufs */
5801         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5802                 mat = m;
5803                 while (mat) {
5804                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5805                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5806                         }
5807                         mat = SCTP_BUF_NEXT(mat);
5808                 }
5809         }
5810 #endif
5811 #ifdef  SCTP_PACKET_LOGGING
5812         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5813                 sctp_packet_log(m, mlen);
5814 #endif
5815         /*
5816          * Must take out the iphlen, since mlen expects this (only effect lb
5817          * case)
5818          */
5819         mlen -= iphlen;
5820
5821         /*
5822          * Get IP, SCTP, and first chunk header together in first mbuf.
5823          */
5824         ip = mtod(m, struct ip *);
5825         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5826         if (SCTP_BUF_LEN(m) < offset) {
5827                 if ((m = m_pullup(m, offset)) == 0) {
5828                         SCTP_STAT_INCR(sctps_hdrops);
5829                         return;
5830                 }
5831                 ip = mtod(m, struct ip *);
5832         }
5833         /* validate mbuf chain length with IP payload length */
5834         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5835                 SCTP_STAT_INCR(sctps_hdrops);
5836                 goto bad;
5837         }
5838         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5839         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5840         SCTPDBG(SCTP_DEBUG_INPUT1,
5841             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5842
5843         /* SCTP does not allow broadcasts or multicasts */
5844         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5845                 goto bad;
5846         }
5847         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5848                 /*
5849                  * We only look at broadcast if its a front state, All
5850                  * others we will not have a tcb for anyway.
5851                  */
5852                 goto bad;
5853         }
5854         /* validate SCTP checksum */
5855         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5856             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5857             m->m_pkthdr.len,
5858             if_name(m->m_pkthdr.rcvif),
5859             m->m_pkthdr.csum_flags);
5860 #if defined(SCTP_WITH_NO_CSUM)
5861         SCTP_STAT_INCR(sctps_recvnocrc);
5862 #else
5863         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5864                 SCTP_STAT_INCR(sctps_recvhwcrc);
5865                 goto sctp_skip_csum_4;
5866         }
5867         check = sh->checksum;   /* save incoming checksum */
5868         sh->checksum = 0;       /* prepare for calc */
5869         calc_check = sctp_calculate_cksum(m, iphlen);
5870         sh->checksum = check;
5871         SCTP_STAT_INCR(sctps_recvswcrc);
5872         if (calc_check != check) {
5873                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5874                     calc_check, check, m, mlen, iphlen);
5875
5876                 stcb = sctp_findassociation_addr(m, iphlen,
5877                     offset - sizeof(*ch),
5878                     sh, ch, &inp, &net,
5879                     vrf_id);
5880                 if ((net) && (port)) {
5881                         if (net->port == 0) {
5882                                 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5883                         }
5884                         net->port = port;
5885                 }
5886                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5887                         net->flowid = m->m_pkthdr.flowid;
5888 #ifdef INVARIANTS
5889                         net->flowidset = 1;
5890 #endif
5891                 }
5892                 if ((inp) && (stcb)) {
5893                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5894                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5895                 } else if ((inp != NULL) && (stcb == NULL)) {
5896                         refcount_up = 1;
5897                 }
5898                 SCTP_STAT_INCR(sctps_badsum);
5899                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5900                 goto bad;
5901         }
5902 sctp_skip_csum_4:
5903 #endif
5904         /* destination port of 0 is illegal, based on RFC2960. */
5905         if (sh->dest_port == 0) {
5906                 SCTP_STAT_INCR(sctps_hdrops);
5907                 goto bad;
5908         }
5909         /*
5910          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5911          * IP/SCTP/first chunk header...
5912          */
5913         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
5914             sh, ch, &inp, &net, vrf_id);
5915         if ((net) && (port)) {
5916                 if (net->port == 0) {
5917                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5918                 }
5919                 net->port = port;
5920         }
5921         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5922                 net->flowid = m->m_pkthdr.flowid;
5923 #ifdef INVARIANTS
5924                 net->flowidset = 1;
5925 #endif
5926         }
5927         /* inp's ref-count increased && stcb locked */
5928         if (inp == NULL) {
5929                 struct sctp_init_chunk *init_chk, chunk_buf;
5930
5931                 SCTP_STAT_INCR(sctps_noport);
5932 #ifdef ICMP_BANDLIM
5933                 /*
5934                  * we use the bandwidth limiting to protect against sending
5935                  * too many ABORTS all at once. In this case these count the
5936                  * same as an ICMP message.
5937                  */
5938                 if (badport_bandlim(0) < 0)
5939                         goto bad;
5940 #endif                          /* ICMP_BANDLIM */
5941                 SCTPDBG(SCTP_DEBUG_INPUT1,
5942                     "Sending a ABORT from packet entry!\n");
5943                 if (ch->chunk_type == SCTP_INITIATION) {
5944                         /*
5945                          * we do a trick here to get the INIT tag, dig in
5946                          * and get the tag from the INIT and put it in the
5947                          * common header.
5948                          */
5949                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5950                             iphlen + sizeof(*sh), sizeof(*init_chk),
5951                             (uint8_t *) & chunk_buf);
5952                         if (init_chk != NULL)
5953                                 sh->v_tag = init_chk->init.initiate_tag;
5954                 }
5955                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5956                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
5957                         goto bad;
5958                 }
5959                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5960                         goto bad;
5961                 }
5962                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5963                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5964                 goto bad;
5965         } else if (stcb == NULL) {
5966                 refcount_up = 1;
5967         }
5968 #ifdef IPSEC
5969         /*
5970          * I very much doubt any of the IPSEC stuff will work but I have no
5971          * idea, so I will leave it in place.
5972          */
5973         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5974                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5975                 SCTP_STAT_INCR(sctps_hdrops);
5976                 goto bad;
5977         }
5978 #endif                          /* IPSEC */
5979
5980         /*
5981          * common chunk processing
5982          */
5983         length = ip->ip_len + iphlen;
5984         offset -= sizeof(struct sctp_chunkhdr);
5985
5986         ecn_bits = ip->ip_tos;
5987
5988         /* sa_ignore NO_NULL_CHK */
5989         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
5990             inp, stcb, net, ecn_bits, vrf_id, port);
5991         /* inp's ref-count reduced && stcb unlocked */
5992         if (m) {
5993                 sctp_m_freem(m);
5994         }
5995         if ((inp) && (refcount_up)) {
5996                 /* reduce ref-count */
5997                 SCTP_INP_DECR_REF(inp);
5998         }
5999         return;
6000 bad:
6001         if (stcb) {
6002                 SCTP_TCB_UNLOCK(stcb);
6003         }
6004         if ((inp) && (refcount_up)) {
6005                 /* reduce ref-count */
6006                 SCTP_INP_DECR_REF(inp);
6007         }
6008         if (m) {
6009                 sctp_m_freem(m);
6010         }
6011         return;
6012 }
6013
6014 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6015 extern int *sctp_cpuarry;
6016
6017 #endif
6018
6019 void
6020 sctp_input(struct mbuf *m, int off)
6021 {
6022 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6023         struct ip *ip;
6024         struct sctphdr *sh;
6025         int offset;
6026         int cpu_to_use;
6027         uint32_t flowid, tag;
6028
6029         if (mp_ncpus > 1) {
6030                 if (m->m_flags & M_FLOWID) {
6031                         flowid = m->m_pkthdr.flowid;
6032                 } else {
6033                         /*
6034                          * No flow id built by lower layers fix it so we
6035                          * create one.
6036                          */
6037                         ip = mtod(m, struct ip *);
6038                         offset = off + sizeof(*sh);
6039                         if (SCTP_BUF_LEN(m) < offset) {
6040                                 if ((m = m_pullup(m, offset)) == 0) {
6041                                         SCTP_STAT_INCR(sctps_hdrops);
6042                                         return;
6043                                 }
6044                                 ip = mtod(m, struct ip *);
6045                         }
6046                         sh = (struct sctphdr *)((caddr_t)ip + off);
6047                         tag = htonl(sh->v_tag);
6048                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6049                         m->m_pkthdr.flowid = flowid;
6050                         m->m_flags |= M_FLOWID;
6051                 }
6052                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6053                 sctp_queue_to_mcore(m, off, cpu_to_use);
6054                 return;
6055         }
6056 #endif
6057         sctp_input_with_port(m, off, 0);
6058 }
6059
6060 #endif