sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, 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 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  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,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /* We are only accepting if we have a listening socket. */
 165         if ((stcb == NULL) &&
 166             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 167             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 168             (!SCTP_IS_LISTENING(inp)))) {
 169                 /*
 170                  * FIX ME ?? What about TCP model and we have a
 171                  * match/restart case? Actually no fix is needed. the lookup
 172                  * will always find the existing assoc so stcb would not be
 173                  * NULL. It may be questionable to do this since we COULD
 174                  * just send back the INIT-ACK and hope that the app did
 175                  * accept()'s by the time the COOKIE was sent. But there is
 176                  * a price to pay for COOKIE generation and I don't want to
 177                  * pay it on the chance that the app will actually do some
 178                  * accepts(). The App just looses and should NOT be in this
 179                  * state :-)
 180                  */
 181                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 182                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 183                             "No listener");
 184                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 185                             mflowtype, mflowid, inp->fibnum,
 186                             vrf_id, port);
 187                 }
 188                 goto outnow;
 189         }
 190         if ((stcb != NULL) &&
 191             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 192                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 193                 sctp_send_shutdown_ack(stcb, NULL);
 194                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 195         } else {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 197                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 198                     src, dst, sh, cp,
 199                     mflowtype, mflowid,
 200                     vrf_id, port);
 201         }
 202 outnow:
 203         if (stcb == NULL) {
 204                 SCTP_INP_RUNLOCK(inp);
 205         }
 206 }
 207
 208 /*
 209  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 210  */
 211
 212 int
 213 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 214 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 215     SCTP_UNUSED
 216 #endif
 217 )
 218 {
 219         int unsent_data;
 220         unsigned int i;
 221         struct sctp_stream_queue_pending *sp;
 222         struct sctp_association *asoc;
 223
 224         /*
 225          * This function returns if any stream has true unsent data on it.
 226          * Note that as it looks through it will clean up any places that
 227          * have old data that has been sent but left at top of stream queue.
 228          */
 229         asoc = &stcb->asoc;
 230         unsent_data = 0;
 231         SCTP_TCB_SEND_LOCK(stcb);
 232         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 233                 /* Check to see if some data queued */
 234                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 235                         /* sa_ignore FREED_MEMORY */
 236                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 237                         if (sp == NULL) {
 238                                 continue;
 239                         }
 240                         if ((sp->msg_is_complete) &&
 241                             (sp->length == 0) &&
 242                             (sp->sender_all_done)) {
 243                                 /*
 244                                  * We are doing differed cleanup. Last time
 245                                  * through when we took all the data the
 246                                  * sender_all_done was not set.
 247                                  */
 248                                 if (sp->put_last_out == 0) {
 249                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 250                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 251                                             sp->sender_all_done,
 252                                             sp->length,
 253                                             sp->msg_is_complete,
 254                                             sp->put_last_out);
 255                                 }
 256                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 257                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 258                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 259                                 if (sp->net) {
 260                                         sctp_free_remote_addr(sp->net);
 261                                         sp->net = NULL;
 262                                 }
 263                                 if (sp->data) {
 264                                         sctp_m_freem(sp->data);
 265                                         sp->data = NULL;
 266                                 }
 267                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 268                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 269                                         unsent_data++;
 270                                 }
 271                         } else {
 272                                 unsent_data++;
 273                         }
 274                         if (unsent_data > 0) {
 275                                 break;
 276                         }
 277                 }
 278         }
 279         SCTP_TCB_SEND_UNLOCK(stcb);
 280         return (unsent_data);
 281 }
 282
 283 static int
 284 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 285 {
 286         struct sctp_init *init;
 287         struct sctp_association *asoc;
 288         struct sctp_nets *lnet;
 289         unsigned int i;
 290
 291         init = &cp->init;
 292         asoc = &stcb->asoc;
 293         /* save off parameters */
 294         asoc->peer_vtag = ntohl(init->initiate_tag);
 295         asoc->peers_rwnd = ntohl(init->a_rwnd);
 296         /* init tsn's */
 297         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 298
 299         if (!TAILQ_EMPTY(&asoc->nets)) {
 300                 /* update any ssthresh's that may have a default */
 301                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 302                         lnet->ssthresh = asoc->peers_rwnd;
 303                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 304                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 305                         }
 306                 }
 307         }
 308         SCTP_TCB_SEND_LOCK(stcb);
 309         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 310                 unsigned int newcnt;
 311                 struct sctp_stream_out *outs;
 312                 struct sctp_stream_queue_pending *sp, *nsp;
 313                 struct sctp_tmit_chunk *chk, *nchk;
 314
 315                 /* abandon the upper streams */
 316                 newcnt = ntohs(init->num_inbound_streams);
 317                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 318                         if (chk->rec.data.sid >= newcnt) {
 319                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 320                                 asoc->send_queue_cnt--;
 321                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 322                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 323 #ifdef INVARIANTS
 324                                 } else {
 325                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 326 #endif
 327                                 }
 328                                 if (chk->data != NULL) {
 329                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 330                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 331                                             0, chk, SCTP_SO_NOT_LOCKED);
 332                                         if (chk->data) {
 333                                                 sctp_m_freem(chk->data);
 334                                                 chk->data = NULL;
 335                                         }
 336                                 }
 337                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 338                                 /* sa_ignore FREED_MEMORY */
 339                         }
 340                 }
 341                 if (asoc->strmout) {
 342                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 343                                 outs = &asoc->strmout[i];
 344                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 345                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 346                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 347                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 348                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 349                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 350                                         if (sp->data) {
 351                                                 sctp_m_freem(sp->data);
 352                                                 sp->data = NULL;
 353                                         }
 354                                         if (sp->net) {
 355                                                 sctp_free_remote_addr(sp->net);
 356                                                 sp->net = NULL;
 357                                         }
 358                                         /* Free the chunk */
 359                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 360                                         /* sa_ignore FREED_MEMORY */
 361                                 }
 362                                 outs->state = SCTP_STREAM_CLOSED;
 363                         }
 364                 }
 365                 /* cut back the count */
 366                 asoc->pre_open_streams = newcnt;
 367         }
 368         SCTP_TCB_SEND_UNLOCK(stcb);
 369         asoc->streamoutcnt = asoc->pre_open_streams;
 370         if (asoc->strmout) {
 371                 for (i = 0; i < asoc->streamoutcnt; i++) {
 372                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 373                 }
 374         }
 375         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 376         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 377         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 378                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 379         }
 380         /* This is the next one we expect */
 381         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 382
 383         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 384         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 385
 386         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 387         /* open the requested streams */
 388
 389         if (asoc->strmin != NULL) {
 390                 /* Free the old ones */
 391                 for (i = 0; i < asoc->streamincnt; i++) {
 392                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 393                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 394                 }
 395                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 396         }
 397         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 398                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 399         } else {
 400                 asoc->streamincnt = asoc->max_inbound_streams;
 401         }
 402         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 403             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 404         if (asoc->strmin == NULL) {
 405                 /* we didn't get memory for the streams! */
 406                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 407                 return (-1);
 408         }
 409         for (i = 0; i < asoc->streamincnt; i++) {
 410                 asoc->strmin[i].sid = i;
 411                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 412                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 413                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 414                 asoc->strmin[i].pd_api_started = 0;
 415                 asoc->strmin[i].delivery_started = 0;
 416         }
 417         /*
 418          * load_address_from_init will put the addresses into the
 419          * association when the COOKIE is processed or the INIT-ACK is
 420          * processed. Both types of COOKIE's existing and new call this
 421          * routine. It will remove addresses that are no longer in the
 422          * association (for the restarting case where addresses are
 423          * removed). Up front when the INIT arrives we will discard it if it
 424          * is a restart and new addresses have been added.
 425          */
 426         /* sa_ignore MEMLEAK */
 427         return (0);
 428 }
 429
 430 /*
 431  * INIT-ACK message processing/consumption returns value < 0 on error
 432  */
 433 static int
 434 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 435     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 436     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 437     struct sctp_nets *net, int *abort_no_unlock,
 438     uint8_t mflowtype, uint32_t mflowid,
 439     uint32_t vrf_id)
 440 {
 441         struct sctp_association *asoc;
 442         struct mbuf *op_err;
 443         int retval, abort_flag;
 444         uint32_t initack_limit;
 445         int nat_friendly = 0;
 446
 447         /* First verify that we have no illegal param's */
 448         abort_flag = 0;
 449
 450         op_err = sctp_arethere_unrecognized_parameters(m,
 451             (offset + sizeof(struct sctp_init_chunk)),
 452             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 453         if (abort_flag) {
 454                 /* Send an abort and notify peer */
 455                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 456                 *abort_no_unlock = 1;
 457                 return (-1);
 458         }
 459         asoc = &stcb->asoc;
 460         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 461         /* process the peer's parameters in the INIT-ACK */
 462         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 463         if (retval < 0) {
 464                 return (retval);
 465         }
 466         initack_limit = offset + ntohs(cp->ch.chunk_length);
 467         /* load all addresses */
 468         if ((retval = sctp_load_addresses_from_init(stcb, m,
 469             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 470             src, dst, NULL, stcb->asoc.port))) {
 471                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 472                     "Problem with address parameters");
 473                 SCTPDBG(SCTP_DEBUG_INPUT1,
 474                     "Load addresses from INIT causes an abort %d\n",
 475                     retval);
 476                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 477                     src, dst, sh, op_err,
 478                     mflowtype, mflowid,
 479                     vrf_id, net->port);
 480                 *abort_no_unlock = 1;
 481                 return (-1);
 482         }
 483         /* if the peer doesn't support asconf, flush the asconf queue */
 484         if (asoc->asconf_supported == 0) {
 485                 struct sctp_asconf_addr *param, *nparam;
 486
 487                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 488                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 489                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 490                 }
 491         }
 492         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 493             stcb->asoc.local_hmacs);
 494         if (op_err) {
 495                 sctp_queue_op_err(stcb, op_err);
 496                 /* queuing will steal away the mbuf chain to the out queue */
 497                 op_err = NULL;
 498         }
 499         /* extract the cookie and queue it to "echo" it back... */
 500         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 501                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 502                     stcb->asoc.overall_error_count,
 503                     0,
 504                     SCTP_FROM_SCTP_INPUT,
 505                     __LINE__);
 506         }
 507         stcb->asoc.overall_error_count = 0;
 508         net->error_count = 0;
 509
 510         /*
 511          * Cancel the INIT timer, We do this first before queueing the
 512          * cookie. We always cancel at the primary to assue that we are
 513          * canceling the timer started by the INIT which always goes to the
 514          * primary.
 515          */
 516         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 517             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 518
 519         /* calculate the RTO */
 520         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 521             SCTP_RTT_FROM_NON_DATA);
 522         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 523         if (retval < 0) {
 524                 /*
 525                  * No cookie, we probably should send a op error. But in any
 526                  * case if there is no cookie in the INIT-ACK, we can
 527                  * abandon the peer, its broke.
 528                  */
 529                 if (retval == -3) {
 530                         uint16_t len;
 531
 532                         len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 533                         /* We abort with an error of missing mandatory param */
 534                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 535                         if (op_err != NULL) {
 536                                 struct sctp_error_missing_param *cause;
 537
 538                                 SCTP_BUF_LEN(op_err) = len;
 539                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 540                                 /* Subtract the reserved param */
 541                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 542                                 cause->cause.length = htons(len);
 543                                 cause->num_missing_params = htonl(1);
 544                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 545                         }
 546                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 547                             src, dst, sh, op_err,
 548                             mflowtype, mflowid,
 549                             vrf_id, net->port);
 550                         *abort_no_unlock = 1;
 551                 }
 552                 return (retval);
 553         }
 554         return (0);
 555 }
 556
 557 static void
 558 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 559     struct sctp_tcb *stcb, struct sctp_nets *net)
 560 {
 561         union sctp_sockstore store;
 562         struct sctp_nets *r_net, *f_net;
 563         struct timeval tv;
 564         int req_prim = 0;
 565         uint16_t old_error_counter;
 566
 567         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 568                 /* Invalid length */
 569                 return;
 570         }
 571         memset(&store, 0, sizeof(store));
 572         switch (cp->heartbeat.hb_info.addr_family) {
 573 #ifdef INET
 574         case AF_INET:
 575                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 576                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 577                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 578                         store.sin.sin_port = stcb->rport;
 579                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 580                             sizeof(store.sin.sin_addr));
 581                 } else {
 582                         return;
 583                 }
 584                 break;
 585 #endif
 586 #ifdef INET6
 587         case AF_INET6:
 588                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 589                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 590                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 591                         store.sin6.sin6_port = stcb->rport;
 592                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 593                 } else {
 594                         return;
 595                 }
 596                 break;
 597 #endif
 598         default:
 599                 return;
 600         }
 601         r_net = sctp_findnet(stcb, &store.sa);
 602         if (r_net == NULL) {
 603                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 604                 return;
 605         }
 606         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 607             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 608             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 609                 /*
 610                  * If the its a HB and it's random value is correct when can
 611                  * confirm the destination.
 612                  */
 613                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 614                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 615                         stcb->asoc.primary_destination = r_net;
 616                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 617                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 618                         if (f_net != r_net) {
 619                                 /*
 620                                  * first one on the list is NOT the primary
 621                                  * sctp_cmpaddr() is much more efficient if
 622                                  * the primary is the first on the list,
 623                                  * make it so.
 624                                  */
 625                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 626                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 627                         }
 628                         req_prim = 1;
 629                 }
 630                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 631                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 632                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 633                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 634                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 635         }
 636         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 637                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 638                     stcb->asoc.overall_error_count,
 639                     0,
 640                     SCTP_FROM_SCTP_INPUT,
 641                     __LINE__);
 642         }
 643         stcb->asoc.overall_error_count = 0;
 644         old_error_counter = r_net->error_count;
 645         r_net->error_count = 0;
 646         r_net->hb_responded = 1;
 647         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 648         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 649         /* Now lets do a RTO with this */
 650         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 651             SCTP_RTT_FROM_NON_DATA);
 652         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 653                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 654                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 655                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 656         }
 657         if (r_net->dest_state & SCTP_ADDR_PF) {
 658                 r_net->dest_state &= ~SCTP_ADDR_PF;
 659                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 660         }
 661         if (old_error_counter > 0) {
 662                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 663                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 664                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 665         }
 666         if (r_net == stcb->asoc.primary_destination) {
 667                 if (stcb->asoc.alternate) {
 668                         /* release the alternate, primary is good */
 669                         sctp_free_remote_addr(stcb->asoc.alternate);
 670                         stcb->asoc.alternate = NULL;
 671                 }
 672         }
 673         /* Mobility adaptation */
 674         if (req_prim) {
 675                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 676                     SCTP_MOBILITY_BASE) ||
 677                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 678                     SCTP_MOBILITY_FASTHANDOFF)) &&
 679                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 680                     SCTP_MOBILITY_PRIM_DELETED)) {
 681
 682                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 683                             stcb->sctp_ep, stcb, NULL,
 684                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 685                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 686                             SCTP_MOBILITY_FASTHANDOFF)) {
 687                                 sctp_assoc_immediate_retrans(stcb,
 688                                     stcb->asoc.primary_destination);
 689                         }
 690                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 691                             SCTP_MOBILITY_BASE)) {
 692                                 sctp_move_chunks_from_net(stcb,
 693                                     stcb->asoc.deleted_primary);
 694                         }
 695                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 696                             stcb->asoc.deleted_primary);
 697                 }
 698         }
 699 }
 700
 701 static int
 702 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 703 {
 704         /*
 705          * return 0 means we want you to proceed with the abort non-zero
 706          * means no abort processing
 707          */
 708         struct sctpasochead *head;
 709
 710         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) ||
 711             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 712                 atomic_add_int(&stcb->asoc.refcnt, 1);
 713                 SCTP_TCB_UNLOCK(stcb);
 714                 SCTP_INP_INFO_WLOCK();
 715                 SCTP_TCB_LOCK(stcb);
 716                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 717         }
 718         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 719                 /* generate a new vtag and send init */
 720                 LIST_REMOVE(stcb, sctp_asocs);
 721                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 722                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 723                 /*
 724                  * put it in the bucket in the vtag hash of assoc's for the
 725                  * system
 726                  */
 727                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 728                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 729                 SCTP_INP_INFO_WUNLOCK();
 730                 return (1);
 731         }
 732         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 733                 /*
 734                  * treat like a case where the cookie expired i.e.: - dump
 735                  * current cookie. - generate a new vtag. - resend init.
 736                  */
 737                 /* generate a new vtag and send init */
 738                 LIST_REMOVE(stcb, sctp_asocs);
 739                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 740                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 741                 sctp_stop_all_cookie_timers(stcb);
 742                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 743                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 744                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 745                 /*
 746                  * put it in the bucket in the vtag hash of assoc's for the
 747                  * system
 748                  */
 749                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 750                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 751                 SCTP_INP_INFO_WUNLOCK();
 752                 return (1);
 753         }
 754         return (0);
 755 }
 756
 757 static int
 758 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 759     struct sctp_nets *net)
 760 {
 761         /*
 762          * return 0 means we want you to proceed with the abort non-zero
 763          * means no abort processing
 764          */
 765         if (stcb->asoc.auth_supported == 0) {
 766                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 767                 return (0);
 768         }
 769         sctp_asconf_send_nat_state_update(stcb, net);
 770         return (1);
 771 }
 772
 773
 774 /* Returns 1 if the stcb was aborted, 0 otherwise */
 775 static int
 776 sctp_handle_abort(struct sctp_abort_chunk *abort,
 777     struct sctp_tcb *stcb, struct sctp_nets *net)
 778 {
 779 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 780         struct socket *so;
 781 #endif
 782         uint16_t len;
 783         uint16_t error;
 784
 785         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 786         if (stcb == NULL)
 787                 return (0);
 788
 789         len = ntohs(abort->ch.chunk_length);
 790         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 791                 /*
 792                  * Need to check the cause codes for our two magic nat
 793                  * aborts which don't kill the assoc necessarily.
 794                  */
 795                 struct sctp_error_cause *cause;
 796
 797                 cause = (struct sctp_error_cause *)(abort + 1);
 798                 error = ntohs(cause->code);
 799                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 800                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 801                             abort->ch.chunk_flags);
 802                         if (sctp_handle_nat_colliding_state(stcb)) {
 803                                 return (0);
 804                         }
 805                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 806                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 807                             abort->ch.chunk_flags);
 808                         if (sctp_handle_nat_missing_state(stcb, net)) {
 809                                 return (0);
 810                         }
 811                 }
 812         } else {
 813                 error = 0;
 814         }
 815         /* stop any receive timers */
 816         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 817             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 818         /* notify user of the abort and clean up... */
 819         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 820         /* free the tcb */
 821         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 822         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 823             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 824                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 825         }
 826 #ifdef SCTP_ASOCLOG_OF_TSNS
 827         sctp_print_out_track_log(stcb);
 828 #endif
 829 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 830         so = SCTP_INP_SO(stcb->sctp_ep);
 831         atomic_add_int(&stcb->asoc.refcnt, 1);
 832         SCTP_TCB_UNLOCK(stcb);
 833         SCTP_SOCKET_LOCK(so, 1);
 834         SCTP_TCB_LOCK(stcb);
 835         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 836 #endif
 837         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 838         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 839             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 840 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 841         SCTP_SOCKET_UNLOCK(so, 1);
 842 #endif
 843         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 844         return (1);
 845 }
 846
 847 static void
 848 sctp_start_net_timers(struct sctp_tcb *stcb)
 849 {
 850         uint32_t cnt_hb_sent;
 851         struct sctp_nets *net;
 852
 853         cnt_hb_sent = 0;
 854         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 855                 /*
 856                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 857                  * If the dest in unconfirmed send a hb as well if under
 858                  * max_hb_burst have been sent.
 859                  */
 860                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 861                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 862                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 863                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 864                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 865                         cnt_hb_sent++;
 866                 }
 867         }
 868         if (cnt_hb_sent) {
 869                 sctp_chunk_output(stcb->sctp_ep, stcb,
 870                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 871                     SCTP_SO_NOT_LOCKED);
 872         }
 873 }
 874
 875
 876 static void
 877 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 878     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 879 {
 880         struct sctp_association *asoc;
 881         int some_on_streamwheel;
 882         int old_state;
 883 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 884         struct socket *so;
 885 #endif
 886
 887         SCTPDBG(SCTP_DEBUG_INPUT2,
 888             "sctp_handle_shutdown: handling SHUTDOWN\n");
 889         if (stcb == NULL)
 890                 return;
 891         asoc = &stcb->asoc;
 892         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 893             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 894                 return;
 895         }
 896         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 897                 /* Shutdown NOT the expected size */
 898                 return;
 899         }
 900         old_state = SCTP_GET_STATE(asoc);
 901         sctp_update_acked(stcb, cp, abort_flag);
 902         if (*abort_flag) {
 903                 return;
 904         }
 905         if (asoc->control_pdapi) {
 906                 /*
 907                  * With a normal shutdown we assume the end of last record.
 908                  */
 909                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 910                 if (asoc->control_pdapi->on_strm_q) {
 911                         struct sctp_stream_in *strm;
 912
 913                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 914                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 915                                 /* Unordered */
 916                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 917                                 asoc->control_pdapi->on_strm_q = 0;
 918                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 919                                 /* Ordered */
 920                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 921                                 asoc->control_pdapi->on_strm_q = 0;
 922 #ifdef INVARIANTS
 923                         } else {
 924                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 925                                     asoc->control_pdapi,
 926                                     asoc->control_pdapi->on_strm_q);
 927 #endif
 928                         }
 929                 }
 930                 asoc->control_pdapi->end_added = 1;
 931                 asoc->control_pdapi->pdapi_aborted = 1;
 932                 asoc->control_pdapi = NULL;
 933                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 934 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 935                 so = SCTP_INP_SO(stcb->sctp_ep);
 936                 atomic_add_int(&stcb->asoc.refcnt, 1);
 937                 SCTP_TCB_UNLOCK(stcb);
 938                 SCTP_SOCKET_LOCK(so, 1);
 939                 SCTP_TCB_LOCK(stcb);
 940                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 941                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 942                         /* assoc was freed while we were unlocked */
 943                         SCTP_SOCKET_UNLOCK(so, 1);
 944                         return;
 945                 }
 946 #endif
 947                 if (stcb->sctp_socket) {
 948                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 949                 }
 950 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 951                 SCTP_SOCKET_UNLOCK(so, 1);
 952 #endif
 953         }
 954         /* goto SHUTDOWN_RECEIVED state to block new requests */
 955         if (stcb->sctp_socket) {
 956                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 957                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 958                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 959                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 960                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 961                         /*
 962                          * notify upper layer that peer has initiated a
 963                          * shutdown
 964                          */
 965                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 966
 967                         /* reset time */
 968                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 969                 }
 970         }
 971         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 972                 /*
 973                  * stop the shutdown timer, since we WILL move to
 974                  * SHUTDOWN-ACK-SENT.
 975                  */
 976                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 977                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 978         }
 979         /* Now is there unsent data on a stream somewhere? */
 980         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 981
 982         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 983             !TAILQ_EMPTY(&asoc->sent_queue) ||
 984             some_on_streamwheel) {
 985                 /* By returning we will push more data out */
 986                 return;
 987         } else {
 988                 /* no outstanding data to send, so move on... */
 989                 /* send SHUTDOWN-ACK */
 990                 /* move to SHUTDOWN-ACK-SENT state */
 991                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 992                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 993                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 994                 }
 995                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 996                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 997                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 998                         sctp_stop_timers_for_shutdown(stcb);
 999                         sctp_send_shutdown_ack(stcb, net);
1000                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
1001                             stcb->sctp_ep, stcb, net);
1002                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1003                         sctp_send_shutdown_ack(stcb, net);
1004                 }
1005         }
1006 }
1007
1008 static void
1009 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1010     struct sctp_tcb *stcb,
1011     struct sctp_nets *net)
1012 {
1013         struct sctp_association *asoc;
1014 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1015         struct socket *so;
1016
1017         so = SCTP_INP_SO(stcb->sctp_ep);
1018 #endif
1019         SCTPDBG(SCTP_DEBUG_INPUT2,
1020             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1021         if (stcb == NULL)
1022                 return;
1023
1024         asoc = &stcb->asoc;
1025         /* process according to association state */
1026         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
1027             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
1028                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1029                 sctp_send_shutdown_complete(stcb, net, 1);
1030                 SCTP_TCB_UNLOCK(stcb);
1031                 return;
1032         }
1033         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1034             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1035                 /* unexpected SHUTDOWN-ACK... so ignore... */
1036                 SCTP_TCB_UNLOCK(stcb);
1037                 return;
1038         }
1039         if (asoc->control_pdapi) {
1040                 /*
1041                  * With a normal shutdown we assume the end of last record.
1042                  */
1043                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1044                 asoc->control_pdapi->end_added = 1;
1045                 asoc->control_pdapi->pdapi_aborted = 1;
1046                 asoc->control_pdapi = NULL;
1047                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1049                 atomic_add_int(&stcb->asoc.refcnt, 1);
1050                 SCTP_TCB_UNLOCK(stcb);
1051                 SCTP_SOCKET_LOCK(so, 1);
1052                 SCTP_TCB_LOCK(stcb);
1053                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1054                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1055                         /* assoc was freed while we were unlocked */
1056                         SCTP_SOCKET_UNLOCK(so, 1);
1057                         return;
1058                 }
1059 #endif
1060                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1061 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1062                 SCTP_SOCKET_UNLOCK(so, 1);
1063 #endif
1064         }
1065 #ifdef INVARIANTS
1066         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1067             !TAILQ_EMPTY(&asoc->sent_queue) ||
1068             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1069                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1070         }
1071 #endif
1072         /* stop the timer */
1073         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1074             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1075         /* send SHUTDOWN-COMPLETE */
1076         sctp_send_shutdown_complete(stcb, net, 0);
1077         /* notify upper layer protocol */
1078         if (stcb->sctp_socket) {
1079                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1080                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1081                         stcb->sctp_socket->so_snd.sb_cc = 0;
1082                 }
1083                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1084         }
1085         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1086         /* free the TCB but first save off the ep */
1087 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1088         atomic_add_int(&stcb->asoc.refcnt, 1);
1089         SCTP_TCB_UNLOCK(stcb);
1090         SCTP_SOCKET_LOCK(so, 1);
1091         SCTP_TCB_LOCK(stcb);
1092         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1093 #endif
1094         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1095             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1096 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1097         SCTP_SOCKET_UNLOCK(so, 1);
1098 #endif
1099 }
1100
1101 /*
1102  * Skip past the param header and then we will find the chunk that caused the
1103  * problem. There are two possibilities ASCONF or FWD-TSN other than that and
1104  * our peer must be broken.
1105  */
1106 static void
1107 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1108     struct sctp_nets *net)
1109 {
1110         struct sctp_chunkhdr *chk;
1111
1112         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1113         switch (chk->chunk_type) {
1114         case SCTP_ASCONF_ACK:
1115         case SCTP_ASCONF:
1116                 sctp_asconf_cleanup(stcb, net);
1117                 break;
1118         case SCTP_IFORWARD_CUM_TSN:
1119         case SCTP_FORWARD_CUM_TSN:
1120                 stcb->asoc.prsctp_supported = 0;
1121                 break;
1122         default:
1123                 SCTPDBG(SCTP_DEBUG_INPUT2,
1124                     "Peer does not support chunk type %d(%x)??\n",
1125                     chk->chunk_type, (uint32_t)chk->chunk_type);
1126                 break;
1127         }
1128 }
1129
1130 /*
1131  * Skip past the param header and then we will find the param that caused the
1132  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1133  * these will turn of specific features.
1134  * XXX: Is this the right thing to do?
1135  */
1136 static void
1137 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1138 {
1139         struct sctp_paramhdr *pbad;
1140
1141         pbad = phdr + 1;
1142         switch (ntohs(pbad->param_type)) {
1143                 /* pr-sctp draft */
1144         case SCTP_PRSCTP_SUPPORTED:
1145                 stcb->asoc.prsctp_supported = 0;
1146                 break;
1147         case SCTP_SUPPORTED_CHUNK_EXT:
1148                 break;
1149                 /* draft-ietf-tsvwg-addip-sctp */
1150         case SCTP_HAS_NAT_SUPPORT:
1151                 stcb->asoc.peer_supports_nat = 0;
1152                 break;
1153         case SCTP_ADD_IP_ADDRESS:
1154         case SCTP_DEL_IP_ADDRESS:
1155         case SCTP_SET_PRIM_ADDR:
1156                 stcb->asoc.asconf_supported = 0;
1157                 break;
1158         case SCTP_SUCCESS_REPORT:
1159         case SCTP_ERROR_CAUSE_IND:
1160                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1161                 SCTPDBG(SCTP_DEBUG_INPUT2,
1162                     "Turning off ASCONF to this strange peer\n");
1163                 stcb->asoc.asconf_supported = 0;
1164                 break;
1165         default:
1166                 SCTPDBG(SCTP_DEBUG_INPUT2,
1167                     "Peer does not support param type %d(%x)??\n",
1168                     pbad->param_type, (uint32_t)pbad->param_type);
1169                 break;
1170         }
1171 }
1172
1173 static int
1174 sctp_handle_error(struct sctp_chunkhdr *ch,
1175     struct sctp_tcb *stcb, struct sctp_nets *net)
1176 {
1177         int chklen;
1178         struct sctp_paramhdr *phdr;
1179         uint16_t error, error_type;
1180         uint16_t error_len;
1181         struct sctp_association *asoc;
1182         int adjust;
1183 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1184         struct socket *so;
1185 #endif
1186
1187         /* parse through all of the errors and process */
1188         asoc = &stcb->asoc;
1189         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1190             sizeof(struct sctp_chunkhdr));
1191         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1192         error = 0;
1193         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1194                 /* Process an Error Cause */
1195                 error_type = ntohs(phdr->param_type);
1196                 error_len = ntohs(phdr->param_length);
1197                 if ((error_len > chklen) || (error_len == 0)) {
1198                         /* invalid param length for this param */
1199                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1200                             chklen, error_len);
1201                         return (0);
1202                 }
1203                 if (error == 0) {
1204                         /* report the first error cause */
1205                         error = error_type;
1206                 }
1207                 switch (error_type) {
1208                 case SCTP_CAUSE_INVALID_STREAM:
1209                 case SCTP_CAUSE_MISSING_PARAM:
1210                 case SCTP_CAUSE_INVALID_PARAM:
1211                 case SCTP_CAUSE_NO_USER_DATA:
1212                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1213                             error_type);
1214                         break;
1215                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1216                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1217                             ch->chunk_flags);
1218                         if (sctp_handle_nat_colliding_state(stcb)) {
1219                                 return (0);
1220                         }
1221                         break;
1222                 case SCTP_CAUSE_NAT_MISSING_STATE:
1223                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1224                             ch->chunk_flags);
1225                         if (sctp_handle_nat_missing_state(stcb, net)) {
1226                                 return (0);
1227                         }
1228                         break;
1229                 case SCTP_CAUSE_STALE_COOKIE:
1230                         /*
1231                          * We only act if we have echoed a cookie and are
1232                          * waiting.
1233                          */
1234                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1235                                 int *p;
1236
1237                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1238                                 /* Save the time doubled */
1239                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1240                                 asoc->stale_cookie_count++;
1241                                 if (asoc->stale_cookie_count >
1242                                     asoc->max_init_times) {
1243                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1244                                         /* now free the asoc */
1245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1246                                         so = SCTP_INP_SO(stcb->sctp_ep);
1247                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1248                                         SCTP_TCB_UNLOCK(stcb);
1249                                         SCTP_SOCKET_LOCK(so, 1);
1250                                         SCTP_TCB_LOCK(stcb);
1251                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1252 #endif
1253                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1254                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1256                                         SCTP_SOCKET_UNLOCK(so, 1);
1257 #endif
1258                                         return (-1);
1259                                 }
1260                                 /* blast back to INIT state */
1261                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1262                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1263                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1264                                 sctp_stop_all_cookie_timers(stcb);
1265                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1266                         }
1267                         break;
1268                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1269                         /*
1270                          * Nothing we can do here, we don't do hostname
1271                          * addresses so if the peer does not like my IPv6
1272                          * (or IPv4 for that matter) it does not matter. If
1273                          * they don't support that type of address, they can
1274                          * NOT possibly get that packet type... i.e. with no
1275                          * IPv6 you can't receive a IPv6 packet. so we can
1276                          * safely ignore this one. If we ever added support
1277                          * for HOSTNAME Addresses, then we would need to do
1278                          * something here.
1279                          */
1280                         break;
1281                 case SCTP_CAUSE_UNRECOG_CHUNK:
1282                         sctp_process_unrecog_chunk(stcb, phdr, net);
1283                         break;
1284                 case SCTP_CAUSE_UNRECOG_PARAM:
1285                         sctp_process_unrecog_param(stcb, phdr);
1286                         break;
1287                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1288                         /*
1289                          * We ignore this since the timer will drive out a
1290                          * new cookie anyway and there timer will drive us
1291                          * to send a SHUTDOWN_COMPLETE. We can't send one
1292                          * here since we don't have their tag.
1293                          */
1294                         break;
1295                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1296                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1297                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1298                         /*
1299                          * We should NOT get these here, but in a
1300                          * ASCONF-ACK.
1301                          */
1302                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1303                             error_type);
1304                         break;
1305                 case SCTP_CAUSE_OUT_OF_RESC:
1306                         /*
1307                          * And what, pray tell do we do with the fact that
1308                          * the peer is out of resources? Not really sure we
1309                          * could do anything but abort. I suspect this
1310                          * should have came WITH an abort instead of in a
1311                          * OP-ERROR.
1312                          */
1313                         break;
1314                 default:
1315                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1316                             error_type);
1317                         break;
1318                 }
1319                 adjust = SCTP_SIZE32(error_len);
1320                 chklen -= adjust;
1321                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1322         }
1323         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1324         return (0);
1325 }
1326
1327 static int
1328 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1329     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1330     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1331     struct sctp_nets *net, int *abort_no_unlock,
1332     uint8_t mflowtype, uint32_t mflowid,
1333     uint32_t vrf_id)
1334 {
1335         struct sctp_init_ack *init_ack;
1336         struct mbuf *op_err;
1337
1338         SCTPDBG(SCTP_DEBUG_INPUT2,
1339             "sctp_handle_init_ack: handling INIT-ACK\n");
1340
1341         if (stcb == NULL) {
1342                 SCTPDBG(SCTP_DEBUG_INPUT2,
1343                     "sctp_handle_init_ack: TCB is null\n");
1344                 return (-1);
1345         }
1346         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1347                 /* Invalid length */
1348                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1349                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1350                     src, dst, sh, op_err,
1351                     mflowtype, mflowid,
1352                     vrf_id, net->port);
1353                 *abort_no_unlock = 1;
1354                 return (-1);
1355         }
1356         init_ack = &cp->init;
1357         /* validate parameters */
1358         if (init_ack->initiate_tag == 0) {
1359                 /* protocol error... send an abort */
1360                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1361                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1362                     src, dst, sh, op_err,
1363                     mflowtype, mflowid,
1364                     vrf_id, net->port);
1365                 *abort_no_unlock = 1;
1366                 return (-1);
1367         }
1368         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1369                 /* protocol error... send an abort */
1370                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1371                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1372                     src, dst, sh, op_err,
1373                     mflowtype, mflowid,
1374                     vrf_id, net->port);
1375                 *abort_no_unlock = 1;
1376                 return (-1);
1377         }
1378         if (init_ack->num_inbound_streams == 0) {
1379                 /* protocol error... send an abort */
1380                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1381                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1382                     src, dst, sh, op_err,
1383                     mflowtype, mflowid,
1384                     vrf_id, net->port);
1385                 *abort_no_unlock = 1;
1386                 return (-1);
1387         }
1388         if (init_ack->num_outbound_streams == 0) {
1389                 /* protocol error... send an abort */
1390                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1391                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1392                     src, dst, sh, op_err,
1393                     mflowtype, mflowid,
1394                     vrf_id, net->port);
1395                 *abort_no_unlock = 1;
1396                 return (-1);
1397         }
1398         /* process according to association state... */
1399         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1400         case SCTP_STATE_COOKIE_WAIT:
1401                 /* this is the expected state for this chunk */
1402                 /* process the INIT-ACK parameters */
1403                 if (stcb->asoc.primary_destination->dest_state &
1404                     SCTP_ADDR_UNCONFIRMED) {
1405                         /*
1406                          * The primary is where we sent the INIT, we can
1407                          * always consider it confirmed when the INIT-ACK is
1408                          * returned. Do this before we load addresses
1409                          * though.
1410                          */
1411                         stcb->asoc.primary_destination->dest_state &=
1412                             ~SCTP_ADDR_UNCONFIRMED;
1413                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1414                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1415                 }
1416                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1417                     net, abort_no_unlock,
1418                     mflowtype, mflowid,
1419                     vrf_id) < 0) {
1420                         /* error in parsing parameters */
1421                         return (-1);
1422                 }
1423                 /* update our state */
1424                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1425                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1426
1427                 /* reset the RTO calc */
1428                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1429                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1430                             stcb->asoc.overall_error_count,
1431                             0,
1432                             SCTP_FROM_SCTP_INPUT,
1433                             __LINE__);
1434                 }
1435                 stcb->asoc.overall_error_count = 0;
1436                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1437                 /*
1438                  * collapse the init timer back in case of a exponential
1439                  * backoff
1440                  */
1441                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1442                     stcb, net);
1443                 /*
1444                  * the send at the end of the inbound data processing will
1445                  * cause the cookie to be sent
1446                  */
1447                 break;
1448         case SCTP_STATE_SHUTDOWN_SENT:
1449                 /* incorrect state... discard */
1450                 break;
1451         case SCTP_STATE_COOKIE_ECHOED:
1452                 /* incorrect state... discard */
1453                 break;
1454         case SCTP_STATE_OPEN:
1455                 /* incorrect state... discard */
1456                 break;
1457         case SCTP_STATE_EMPTY:
1458         case SCTP_STATE_INUSE:
1459         default:
1460                 /* incorrect state... discard */
1461                 return (-1);
1462                 break;
1463         }
1464         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1465         return (0);
1466 }
1467
1468 static struct sctp_tcb *
1469 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1470     struct sockaddr *src, struct sockaddr *dst,
1471     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1472     struct sctp_inpcb *inp, struct sctp_nets **netp,
1473     struct sockaddr *init_src, int *notification,
1474     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1475     uint8_t mflowtype, uint32_t mflowid,
1476     uint32_t vrf_id, uint16_t port);
1477
1478
1479 /*
1480  * handle a state cookie for an existing association m: input packet mbuf
1481  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1482  * "split" mbuf and the cookie signature does not exist offset: offset into
1483  * mbuf to the cookie-echo chunk
1484  */
1485 static struct sctp_tcb *
1486 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1487     struct sockaddr *src, struct sockaddr *dst,
1488     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1489     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1490     struct sockaddr *init_src, int *notification,
1491     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1492     uint8_t mflowtype, uint32_t mflowid,
1493     uint32_t vrf_id, uint16_t port)
1494 {
1495         struct sctp_association *asoc;
1496         struct sctp_init_chunk *init_cp, init_buf;
1497         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1498         struct sctp_nets *net;
1499         struct mbuf *op_err;
1500         struct timeval old;
1501         int init_offset, initack_offset, i;
1502         int retval;
1503         int spec_flag = 0;
1504         uint32_t how_indx;
1505 #if defined(SCTP_DETAILED_STR_STATS)
1506         int j;
1507 #endif
1508
1509         net = *netp;
1510         /* I know that the TCB is non-NULL from the caller */
1511         asoc = &stcb->asoc;
1512         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1513                 if (asoc->cookie_how[how_indx] == 0)
1514                         break;
1515         }
1516         if (how_indx < sizeof(asoc->cookie_how)) {
1517                 asoc->cookie_how[how_indx] = 1;
1518         }
1519         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1520                 /* SHUTDOWN came in after sending INIT-ACK */
1521                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1522                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1523                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1524                     mflowtype, mflowid, inp->fibnum,
1525                     vrf_id, net->port);
1526                 if (how_indx < sizeof(asoc->cookie_how))
1527                         asoc->cookie_how[how_indx] = 2;
1528                 return (NULL);
1529         }
1530         /*
1531          * find and validate the INIT chunk in the cookie (peer's info) the
1532          * INIT should start after the cookie-echo header struct (chunk
1533          * header, state cookie header struct)
1534          */
1535         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1536
1537         init_cp = (struct sctp_init_chunk *)
1538             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1539             (uint8_t *)&init_buf);
1540         if (init_cp == NULL) {
1541                 /* could not pull a INIT chunk in cookie */
1542                 return (NULL);
1543         }
1544         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1545                 return (NULL);
1546         }
1547         /*
1548          * find and validate the INIT-ACK chunk in the cookie (my info) the
1549          * INIT-ACK follows the INIT chunk
1550          */
1551         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1552         initack_cp = (struct sctp_init_ack_chunk *)
1553             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1554             (uint8_t *)&initack_buf);
1555         if (initack_cp == NULL) {
1556                 /* could not pull INIT-ACK chunk in cookie */
1557                 return (NULL);
1558         }
1559         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1560                 return (NULL);
1561         }
1562         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1563             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1564                 /*
1565                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1566                  * to get into the OPEN state
1567                  */
1568                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1569                         /*-
1570                          * Opps, this means that we somehow generated two vtag's
1571                          * the same. I.e. we did:
1572                          *  Us               Peer
1573                          *   <---INIT(tag=a)------
1574                          *   ----INIT-ACK(tag=t)-->
1575                          *   ----INIT(tag=t)------> *1
1576                          *   <---INIT-ACK(tag=a)---
1577                          *   <----CE(tag=t)------------- *2
1578                          *
1579                          * At point *1 we should be generating a different
1580                          * tag t'. Which means we would throw away the CE and send
1581                          * ours instead. Basically this is case C (throw away side).
1582                          */
1583                         if (how_indx < sizeof(asoc->cookie_how))
1584                                 asoc->cookie_how[how_indx] = 17;
1585                         return (NULL);
1586
1587                 }
1588                 switch (SCTP_GET_STATE(asoc)) {
1589                 case SCTP_STATE_COOKIE_WAIT:
1590                 case SCTP_STATE_COOKIE_ECHOED:
1591                         /*
1592                          * INIT was sent but got a COOKIE_ECHO with the
1593                          * correct tags... just accept it...but we must
1594                          * process the init so that we can make sure we have
1595                          * the right seq no's.
1596                          */
1597                         /* First we must process the INIT !! */
1598                         retval = sctp_process_init(init_cp, stcb);
1599                         if (retval < 0) {
1600                                 if (how_indx < sizeof(asoc->cookie_how))
1601                                         asoc->cookie_how[how_indx] = 3;
1602                                 return (NULL);
1603                         }
1604                         /* we have already processed the INIT so no problem */
1605                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1606                             stcb, net,
1607                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1608                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1609                             stcb, net,
1610                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1611                         /* update current state */
1612                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1613                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1614                         else
1615                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1616
1617                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1618                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1619                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1620                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1621                         }
1622                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1623                         sctp_stop_all_cookie_timers(stcb);
1624                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1625                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1626                             (!SCTP_IS_LISTENING(inp))) {
1627 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1628                                 struct socket *so;
1629 #endif
1630                                 /*
1631                                  * Here is where collision would go if we
1632                                  * did a connect() and instead got a
1633                                  * init/init-ack/cookie done before the
1634                                  * init-ack came back..
1635                                  */
1636                                 stcb->sctp_ep->sctp_flags |=
1637                                     SCTP_PCB_FLAGS_CONNECTED;
1638 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1639                                 so = SCTP_INP_SO(stcb->sctp_ep);
1640                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1641                                 SCTP_TCB_UNLOCK(stcb);
1642                                 SCTP_SOCKET_LOCK(so, 1);
1643                                 SCTP_TCB_LOCK(stcb);
1644                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1645                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1646                                         SCTP_SOCKET_UNLOCK(so, 1);
1647                                         return (NULL);
1648                                 }
1649 #endif
1650                                 soisconnected(stcb->sctp_socket);
1651 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1652                                 SCTP_SOCKET_UNLOCK(so, 1);
1653 #endif
1654                         }
1655                         /* notify upper layer */
1656                         *notification = SCTP_NOTIFY_ASSOC_UP;
1657                         /*
1658                          * since we did not send a HB make sure we don't
1659                          * double things
1660                          */
1661                         old.tv_sec = cookie->time_entered.tv_sec;
1662                         old.tv_usec = cookie->time_entered.tv_usec;
1663                         net->hb_responded = 1;
1664                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1665                             &old,
1666                             SCTP_RTT_FROM_NON_DATA);
1667
1668                         if (stcb->asoc.sctp_autoclose_ticks &&
1669                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1670                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1671                                     inp, stcb, NULL);
1672                         }
1673                         break;
1674                 default:
1675                         /*
1676                          * we're in the OPEN state (or beyond), so peer must
1677                          * have simply lost the COOKIE-ACK
1678                          */
1679                         break;
1680                 }               /* end switch */
1681                 sctp_stop_all_cookie_timers(stcb);
1682                 /*
1683                  * We ignore the return code here.. not sure if we should
1684                  * somehow abort.. but we do have an existing asoc. This
1685                  * really should not fail.
1686                  */
1687                 if (sctp_load_addresses_from_init(stcb, m,
1688                     init_offset + sizeof(struct sctp_init_chunk),
1689                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1690                         if (how_indx < sizeof(asoc->cookie_how))
1691                                 asoc->cookie_how[how_indx] = 4;
1692                         return (NULL);
1693                 }
1694                 /* respond with a COOKIE-ACK */
1695                 sctp_toss_old_cookies(stcb, asoc);
1696                 sctp_send_cookie_ack(stcb);
1697                 if (how_indx < sizeof(asoc->cookie_how))
1698                         asoc->cookie_how[how_indx] = 5;
1699                 return (stcb);
1700         }
1701         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1702             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1703             cookie->tie_tag_my_vtag == 0 &&
1704             cookie->tie_tag_peer_vtag == 0) {
1705                 /*
1706                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1707                  */
1708                 if (how_indx < sizeof(asoc->cookie_how))
1709                         asoc->cookie_how[how_indx] = 6;
1710                 return (NULL);
1711         }
1712         /*
1713          * If nat support, and the below and stcb is established, send back
1714          * a ABORT(colliding state) if we are established.
1715          */
1716         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1717             (asoc->peer_supports_nat) &&
1718             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1719             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1720             (asoc->peer_vtag == 0)))) {
1721                 /*
1722                  * Special case - Peer's support nat. We may have two init's
1723                  * that we gave out the same tag on since one was not
1724                  * established.. i.e. we get INIT from host-1 behind the nat
1725                  * and we respond tag-a, we get a INIT from host-2 behind
1726                  * the nat and we get tag-a again. Then we bring up host-1
1727                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1728                  * Now we have colliding state. We must send an abort here
1729                  * with colliding state indication.
1730                  */
1731                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1732                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1733                     mflowtype, mflowid, inp->fibnum,
1734                     vrf_id, port);
1735                 return (NULL);
1736         }
1737         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1738             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1739             (asoc->peer_vtag == 0))) {
1740                 /*
1741                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1742                  * should be ok, re-accept peer info
1743                  */
1744                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1745                         /*
1746                          * Extension of case C. If we hit this, then the
1747                          * random number generator returned the same vtag
1748                          * when we first sent our INIT-ACK and when we later
1749                          * sent our INIT. The side with the seq numbers that
1750                          * are different will be the one that normnally
1751                          * would have hit case C. This in effect "extends"
1752                          * our vtags in this collision case to be 64 bits.
1753                          * The same collision could occur aka you get both
1754                          * vtag and seq number the same twice in a row.. but
1755                          * is much less likely. If it did happen then we
1756                          * would proceed through and bring up the assoc.. we
1757                          * may end up with the wrong stream setup however..
1758                          * which would be bad.. but there is no way to
1759                          * tell.. until we send on a stream that does not
1760                          * exist :-)
1761                          */
1762                         if (how_indx < sizeof(asoc->cookie_how))
1763                                 asoc->cookie_how[how_indx] = 7;
1764
1765                         return (NULL);
1766                 }
1767                 if (how_indx < sizeof(asoc->cookie_how))
1768                         asoc->cookie_how[how_indx] = 8;
1769                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1770                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1771                 sctp_stop_all_cookie_timers(stcb);
1772                 /*
1773                  * since we did not send a HB make sure we don't double
1774                  * things
1775                  */
1776                 net->hb_responded = 1;
1777                 if (stcb->asoc.sctp_autoclose_ticks &&
1778                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1779                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1780                             NULL);
1781                 }
1782                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1783                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1784
1785                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1786                         /*
1787                          * Ok the peer probably discarded our data (if we
1788                          * echoed a cookie+data). So anything on the
1789                          * sent_queue should be marked for retransmit, we
1790                          * may not get something to kick us so it COULD
1791                          * still take a timeout to move these.. but it can't
1792                          * hurt to mark them.
1793                          */
1794                         struct sctp_tmit_chunk *chk;
1795
1796                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1797                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1798                                         chk->sent = SCTP_DATAGRAM_RESEND;
1799                                         sctp_flight_size_decrease(chk);
1800                                         sctp_total_flight_decrease(stcb, chk);
1801                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1802                                         spec_flag++;
1803                                 }
1804                         }
1805
1806                 }
1807                 /* process the INIT info (peer's info) */
1808                 retval = sctp_process_init(init_cp, stcb);
1809                 if (retval < 0) {
1810                         if (how_indx < sizeof(asoc->cookie_how))
1811                                 asoc->cookie_how[how_indx] = 9;
1812                         return (NULL);
1813                 }
1814                 if (sctp_load_addresses_from_init(stcb, m,
1815                     init_offset + sizeof(struct sctp_init_chunk),
1816                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1817                         if (how_indx < sizeof(asoc->cookie_how))
1818                                 asoc->cookie_how[how_indx] = 10;
1819                         return (NULL);
1820                 }
1821                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1822                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1823                         *notification = SCTP_NOTIFY_ASSOC_UP;
1824
1825                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1826                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1827                             (!SCTP_IS_LISTENING(inp))) {
1828 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1829                                 struct socket *so;
1830 #endif
1831                                 stcb->sctp_ep->sctp_flags |=
1832                                     SCTP_PCB_FLAGS_CONNECTED;
1833 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1834                                 so = SCTP_INP_SO(stcb->sctp_ep);
1835                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1836                                 SCTP_TCB_UNLOCK(stcb);
1837                                 SCTP_SOCKET_LOCK(so, 1);
1838                                 SCTP_TCB_LOCK(stcb);
1839                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1840                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1841                                         SCTP_SOCKET_UNLOCK(so, 1);
1842                                         return (NULL);
1843                                 }
1844 #endif
1845                                 soisconnected(stcb->sctp_socket);
1846 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1847                                 SCTP_SOCKET_UNLOCK(so, 1);
1848 #endif
1849                         }
1850                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1851                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1852                         else
1853                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1854                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1855                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1856                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1857                 } else {
1858                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1859                 }
1860                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1861                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1862                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1863                             stcb->sctp_ep, stcb, asoc->primary_destination);
1864                 }
1865                 sctp_stop_all_cookie_timers(stcb);
1866                 sctp_toss_old_cookies(stcb, asoc);
1867                 sctp_send_cookie_ack(stcb);
1868                 if (spec_flag) {
1869                         /*
1870                          * only if we have retrans set do we do this. What
1871                          * this call does is get only the COOKIE-ACK out and
1872                          * then when we return the normal call to
1873                          * sctp_chunk_output will get the retrans out behind
1874                          * this.
1875                          */
1876                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1877                 }
1878                 if (how_indx < sizeof(asoc->cookie_how))
1879                         asoc->cookie_how[how_indx] = 11;
1880
1881                 return (stcb);
1882         }
1883         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1884             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1885             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1886             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1887             cookie->tie_tag_peer_vtag != 0) {
1888                 struct sctpasochead *head;
1889 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1890                 struct socket *so;
1891 #endif
1892
1893                 if (asoc->peer_supports_nat) {
1894                         /*
1895                          * This is a gross gross hack. Just call the
1896                          * cookie_new code since we are allowing a duplicate
1897                          * association. I hope this works...
1898                          */
1899                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1900                             sh, cookie, cookie_len,
1901                             inp, netp, init_src, notification,
1902                             auth_skipped, auth_offset, auth_len,
1903                             mflowtype, mflowid,
1904                             vrf_id, port));
1905                 }
1906                 /*
1907                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1908                  */
1909                 /* temp code */
1910                 if (how_indx < sizeof(asoc->cookie_how))
1911                         asoc->cookie_how[how_indx] = 12;
1912                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1913                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1914                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1915                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1916
1917                 /* notify upper layer */
1918                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1919                 atomic_add_int(&stcb->asoc.refcnt, 1);
1920                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1921                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1922                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1923                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1924                 }
1925                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1926                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1927                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1928                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1929                 }
1930                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1931                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1932                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1933                             stcb->sctp_ep, stcb, asoc->primary_destination);
1934
1935                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1936                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1937                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1938                 }
1939                 asoc->pre_open_streams =
1940                     ntohs(initack_cp->init.num_outbound_streams);
1941                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1942                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1943                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1944
1945                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1946
1947                 asoc->str_reset_seq_in = asoc->init_seq_number;
1948
1949                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1950                 if (asoc->mapping_array) {
1951                         memset(asoc->mapping_array, 0,
1952                             asoc->mapping_array_size);
1953                 }
1954                 if (asoc->nr_mapping_array) {
1955                         memset(asoc->nr_mapping_array, 0,
1956                             asoc->mapping_array_size);
1957                 }
1958                 SCTP_TCB_UNLOCK(stcb);
1959 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1960                 so = SCTP_INP_SO(stcb->sctp_ep);
1961                 SCTP_SOCKET_LOCK(so, 1);
1962 #endif
1963                 SCTP_INP_INFO_WLOCK();
1964                 SCTP_INP_WLOCK(stcb->sctp_ep);
1965                 SCTP_TCB_LOCK(stcb);
1966                 atomic_add_int(&stcb->asoc.refcnt, -1);
1967                 /* send up all the data */
1968                 SCTP_TCB_SEND_LOCK(stcb);
1969
1970                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1971                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1972                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1973 #if defined(SCTP_DETAILED_STR_STATS)
1974                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1975                                 asoc->strmout[i].abandoned_sent[j] = 0;
1976                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1977                         }
1978 #else
1979                         asoc->strmout[i].abandoned_sent[0] = 0;
1980                         asoc->strmout[i].abandoned_unsent[0] = 0;
1981 #endif
1982                         stcb->asoc.strmout[i].sid = i;
1983                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1984                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1985                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1986                 }
1987                 /* process the INIT-ACK info (my info) */
1988                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1989                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1990
1991                 /* pull from vtag hash */
1992                 LIST_REMOVE(stcb, sctp_asocs);
1993                 /* re-insert to new vtag position */
1994                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1995                     SCTP_BASE_INFO(hashasocmark))];
1996                 /*
1997                  * put it in the bucket in the vtag hash of assoc's for the
1998                  * system
1999                  */
2000                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2001
2002                 SCTP_TCB_SEND_UNLOCK(stcb);
2003                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2004                 SCTP_INP_INFO_WUNLOCK();
2005 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2006                 SCTP_SOCKET_UNLOCK(so, 1);
2007 #endif
2008                 asoc->total_flight = 0;
2009                 asoc->total_flight_count = 0;
2010                 /* process the INIT info (peer's info) */
2011                 retval = sctp_process_init(init_cp, stcb);
2012                 if (retval < 0) {
2013                         if (how_indx < sizeof(asoc->cookie_how))
2014                                 asoc->cookie_how[how_indx] = 13;
2015
2016                         return (NULL);
2017                 }
2018                 /*
2019                  * since we did not send a HB make sure we don't double
2020                  * things
2021                  */
2022                 net->hb_responded = 1;
2023
2024                 if (sctp_load_addresses_from_init(stcb, m,
2025                     init_offset + sizeof(struct sctp_init_chunk),
2026                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2027                         if (how_indx < sizeof(asoc->cookie_how))
2028                                 asoc->cookie_how[how_indx] = 14;
2029
2030                         return (NULL);
2031                 }
2032                 /* respond with a COOKIE-ACK */
2033                 sctp_stop_all_cookie_timers(stcb);
2034                 sctp_toss_old_cookies(stcb, asoc);
2035                 sctp_send_cookie_ack(stcb);
2036                 if (how_indx < sizeof(asoc->cookie_how))
2037                         asoc->cookie_how[how_indx] = 15;
2038
2039                 return (stcb);
2040         }
2041         if (how_indx < sizeof(asoc->cookie_how))
2042                 asoc->cookie_how[how_indx] = 16;
2043         /* all other cases... */
2044         return (NULL);
2045 }
2046
2047
2048 /*
2049  * handle a state cookie for a new association m: input packet mbuf chain--
2050  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2051  * and the cookie signature does not exist offset: offset into mbuf to the
2052  * cookie-echo chunk length: length of the cookie chunk to: where the init
2053  * was from returns a new TCB
2054  */
2055 static struct sctp_tcb *
2056 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2057     struct sockaddr *src, struct sockaddr *dst,
2058     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2059     struct sctp_inpcb *inp, struct sctp_nets **netp,
2060     struct sockaddr *init_src, int *notification,
2061     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2062     uint8_t mflowtype, uint32_t mflowid,
2063     uint32_t vrf_id, uint16_t port)
2064 {
2065         struct sctp_tcb *stcb;
2066         struct sctp_init_chunk *init_cp, init_buf;
2067         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2068         union sctp_sockstore store;
2069         struct sctp_association *asoc;
2070         int init_offset, initack_offset, initack_limit;
2071         int retval;
2072         int error = 0;
2073         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2074 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2075         struct socket *so;
2076
2077         so = SCTP_INP_SO(inp);
2078 #endif
2079
2080         /*
2081          * find and validate the INIT chunk in the cookie (peer's info) the
2082          * INIT should start after the cookie-echo header struct (chunk
2083          * header, state cookie header struct)
2084          */
2085         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2086         init_cp = (struct sctp_init_chunk *)
2087             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2088             (uint8_t *)&init_buf);
2089         if (init_cp == NULL) {
2090                 /* could not pull a INIT chunk in cookie */
2091                 SCTPDBG(SCTP_DEBUG_INPUT1,
2092                     "process_cookie_new: could not pull INIT chunk hdr\n");
2093                 return (NULL);
2094         }
2095         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2096                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2097                 return (NULL);
2098         }
2099         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2100         /*
2101          * find and validate the INIT-ACK chunk in the cookie (my info) the
2102          * INIT-ACK follows the INIT chunk
2103          */
2104         initack_cp = (struct sctp_init_ack_chunk *)
2105             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2106             (uint8_t *)&initack_buf);
2107         if (initack_cp == NULL) {
2108                 /* could not pull INIT-ACK chunk in cookie */
2109                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2110                 return (NULL);
2111         }
2112         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2113                 return (NULL);
2114         }
2115         /*
2116          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2117          * "initack_limit" value.  This is because the chk_length field
2118          * includes the length of the cookie, but the cookie is omitted when
2119          * the INIT and INIT_ACK are tacked onto the cookie...
2120          */
2121         initack_limit = offset + cookie_len;
2122
2123         /*
2124          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2125          * and popluate
2126          */
2127
2128         /*
2129          * Here we do a trick, we set in NULL for the proc/thread argument.
2130          * We do this since in effect we only use the p argument when the
2131          * socket is unbound and we must do an implicit bind. Since we are
2132          * getting a cookie, we cannot be unbound.
2133          */
2134         stcb = sctp_aloc_assoc(inp, init_src, &error,
2135             ntohl(initack_cp->init.initiate_tag), vrf_id,
2136             ntohs(initack_cp->init.num_outbound_streams),
2137             port,
2138             (struct thread *)NULL
2139             );
2140         if (stcb == NULL) {
2141                 struct mbuf *op_err;
2142
2143                 /* memory problem? */
2144                 SCTPDBG(SCTP_DEBUG_INPUT1,
2145                     "process_cookie_new: no room for another TCB!\n");
2146                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2147                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2148                     src, dst, sh, op_err,
2149                     mflowtype, mflowid,
2150                     vrf_id, port);
2151                 return (NULL);
2152         }
2153         /* get the correct sctp_nets */
2154         if (netp)
2155                 *netp = sctp_findnet(stcb, init_src);
2156
2157         asoc = &stcb->asoc;
2158         /* get scope variables out of cookie */
2159         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2160         asoc->scope.site_scope = cookie->site_scope;
2161         asoc->scope.local_scope = cookie->local_scope;
2162         asoc->scope.loopback_scope = cookie->loopback_scope;
2163
2164         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2165             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2166                 struct mbuf *op_err;
2167
2168                 /*
2169                  * Houston we have a problem. The EP changed while the
2170                  * cookie was in flight. Only recourse is to abort the
2171                  * association.
2172                  */
2173                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2174                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2175                     src, dst, sh, op_err,
2176                     mflowtype, mflowid,
2177                     vrf_id, port);
2178 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2179                 atomic_add_int(&stcb->asoc.refcnt, 1);
2180                 SCTP_TCB_UNLOCK(stcb);
2181                 SCTP_SOCKET_LOCK(so, 1);
2182                 SCTP_TCB_LOCK(stcb);
2183                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2184 #endif
2185                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2186                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2187 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2188                 SCTP_SOCKET_UNLOCK(so, 1);
2189 #endif
2190                 return (NULL);
2191         }
2192         /* process the INIT-ACK info (my info) */
2193         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2194         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2195         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2196         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2197         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2198         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2199         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2200         asoc->str_reset_seq_in = asoc->init_seq_number;
2201
2202         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2203
2204         /* process the INIT info (peer's info) */
2205         if (netp)
2206                 retval = sctp_process_init(init_cp, stcb);
2207         else
2208                 retval = 0;
2209         if (retval < 0) {
2210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2211                 atomic_add_int(&stcb->asoc.refcnt, 1);
2212                 SCTP_TCB_UNLOCK(stcb);
2213                 SCTP_SOCKET_LOCK(so, 1);
2214                 SCTP_TCB_LOCK(stcb);
2215                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2216 #endif
2217                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2218                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2219 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2220                 SCTP_SOCKET_UNLOCK(so, 1);
2221 #endif
2222                 return (NULL);
2223         }
2224         /* load all addresses */
2225         if (sctp_load_addresses_from_init(stcb, m,
2226             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2227             src, dst, init_src, port)) {
2228 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2229                 atomic_add_int(&stcb->asoc.refcnt, 1);
2230                 SCTP_TCB_UNLOCK(stcb);
2231                 SCTP_SOCKET_LOCK(so, 1);
2232                 SCTP_TCB_LOCK(stcb);
2233                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2234 #endif
2235                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2236                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2238                 SCTP_SOCKET_UNLOCK(so, 1);
2239 #endif
2240                 return (NULL);
2241         }
2242         /*
2243          * verify any preceding AUTH chunk that was skipped
2244          */
2245         /* pull the local authentication parameters from the cookie/init-ack */
2246         sctp_auth_get_cookie_params(stcb, m,
2247             initack_offset + sizeof(struct sctp_init_ack_chunk),
2248             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2249         if (auth_skipped) {
2250                 struct sctp_auth_chunk *auth;
2251
2252                 auth = (struct sctp_auth_chunk *)
2253                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2254                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2255                         /* auth HMAC failed, dump the assoc and packet */
2256                         SCTPDBG(SCTP_DEBUG_AUTH1,
2257                             "COOKIE-ECHO: AUTH failed\n");
2258 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2259                         atomic_add_int(&stcb->asoc.refcnt, 1);
2260                         SCTP_TCB_UNLOCK(stcb);
2261                         SCTP_SOCKET_LOCK(so, 1);
2262                         SCTP_TCB_LOCK(stcb);
2263                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2264 #endif
2265                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2266                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2267 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2268                         SCTP_SOCKET_UNLOCK(so, 1);
2269 #endif
2270                         return (NULL);
2271                 } else {
2272                         /* remaining chunks checked... good to go */
2273                         stcb->asoc.authenticated = 1;
2274                 }
2275         }
2276         /*
2277          * if we're doing ASCONFs, check to see if we have any new local
2278          * addresses that need to get added to the peer (eg. addresses
2279          * changed while cookie echo in flight).  This needs to be done
2280          * after we go to the OPEN state to do the correct asconf
2281          * processing. else, make sure we have the correct addresses in our
2282          * lists
2283          */
2284
2285         /* warning, we re-use sin, sin6, sa_store here! */
2286         /* pull in local_address (our "from" address) */
2287         switch (cookie->laddr_type) {
2288 #ifdef INET
2289         case SCTP_IPV4_ADDRESS:
2290                 /* source addr is IPv4 */
2291                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2292                 store.sin.sin_family = AF_INET;
2293                 store.sin.sin_len = sizeof(struct sockaddr_in);
2294                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2295                 break;
2296 #endif
2297 #ifdef INET6
2298         case SCTP_IPV6_ADDRESS:
2299                 /* source addr is IPv6 */
2300                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2301                 store.sin6.sin6_family = AF_INET6;
2302                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2303                 store.sin6.sin6_scope_id = cookie->scope_id;
2304                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2305                 break;
2306 #endif
2307         default:
2308 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2309                 atomic_add_int(&stcb->asoc.refcnt, 1);
2310                 SCTP_TCB_UNLOCK(stcb);
2311                 SCTP_SOCKET_LOCK(so, 1);
2312                 SCTP_TCB_LOCK(stcb);
2313                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2314 #endif
2315                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2316                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2317 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2318                 SCTP_SOCKET_UNLOCK(so, 1);
2319 #endif
2320                 return (NULL);
2321         }
2322
2323         /* update current state */
2324         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2325         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2326         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2327                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2328                     stcb->sctp_ep, stcb, asoc->primary_destination);
2329         }
2330         sctp_stop_all_cookie_timers(stcb);
2331         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2332         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2333
2334         /* set up to notify upper layer */
2335         *notification = SCTP_NOTIFY_ASSOC_UP;
2336         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2337             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2338             (!SCTP_IS_LISTENING(inp))) {
2339                 /*
2340                  * This is an endpoint that called connect() how it got a
2341                  * cookie that is NEW is a bit of a mystery. It must be that
2342                  * the INIT was sent, but before it got there.. a complete
2343                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2344                  * should have went to the other code.. not here.. oh well..
2345                  * a bit of protection is worth having..
2346                  */
2347                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2348 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2349                 atomic_add_int(&stcb->asoc.refcnt, 1);
2350                 SCTP_TCB_UNLOCK(stcb);
2351                 SCTP_SOCKET_LOCK(so, 1);
2352                 SCTP_TCB_LOCK(stcb);
2353                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2354                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2355                         SCTP_SOCKET_UNLOCK(so, 1);
2356                         return (NULL);
2357                 }
2358 #endif
2359                 soisconnected(stcb->sctp_socket);
2360 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2361                 SCTP_SOCKET_UNLOCK(so, 1);
2362 #endif
2363         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2364             (SCTP_IS_LISTENING(inp))) {
2365                 /*
2366                  * We don't want to do anything with this one. Since it is
2367                  * the listening guy. The timer will get started for
2368                  * accepted connections in the caller.
2369                  */
2370                 ;
2371         }
2372         /* since we did not send a HB make sure we don't double things */
2373         if ((netp) && (*netp))
2374                 (*netp)->hb_responded = 1;
2375
2376         if (stcb->asoc.sctp_autoclose_ticks &&
2377             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2378                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2379         }
2380         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2381         if ((netp != NULL) && (*netp != NULL)) {
2382                 struct timeval old;
2383
2384                 /* calculate the RTT and set the encaps port */
2385                 old.tv_sec = cookie->time_entered.tv_sec;
2386                 old.tv_usec = cookie->time_entered.tv_usec;
2387                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2388                     &old, SCTP_RTT_FROM_NON_DATA);
2389         }
2390         /* respond with a COOKIE-ACK */
2391         sctp_send_cookie_ack(stcb);
2392
2393         /*
2394          * check the address lists for any ASCONFs that need to be sent
2395          * AFTER the cookie-ack is sent
2396          */
2397         sctp_check_address_list(stcb, m,
2398             initack_offset + sizeof(struct sctp_init_ack_chunk),
2399             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2400             &store.sa, cookie->local_scope, cookie->site_scope,
2401             cookie->ipv4_scope, cookie->loopback_scope);
2402
2403
2404         return (stcb);
2405 }
2406
2407 /*
2408  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2409  * we NEED to make sure we are not already using the vtag. If so we
2410  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2411         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2412                                                             SCTP_BASE_INFO(hashasocmark))];
2413         LIST_FOREACH(stcb, head, sctp_asocs) {
2414                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2415                        -- SEND ABORT - TRY AGAIN --
2416                 }
2417         }
2418 */
2419
2420 /*
2421  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2422  * existing (non-NULL) TCB
2423  */
2424 static struct mbuf *
2425 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2426     struct sockaddr *src, struct sockaddr *dst,
2427     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2428     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2429     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2430     struct sctp_tcb **locked_tcb,
2431     uint8_t mflowtype, uint32_t mflowid,
2432     uint32_t vrf_id, uint16_t port)
2433 {
2434         struct sctp_state_cookie *cookie;
2435         struct sctp_tcb *l_stcb = *stcb;
2436         struct sctp_inpcb *l_inp;
2437         struct sockaddr *to;
2438         struct sctp_pcb *ep;
2439         struct mbuf *m_sig;
2440         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2441         uint8_t *sig;
2442         uint8_t cookie_ok = 0;
2443         unsigned int sig_offset, cookie_offset;
2444         unsigned int cookie_len;
2445         struct timeval now;
2446         struct timeval time_expires;
2447         int notification = 0;
2448         struct sctp_nets *netl;
2449         int had_a_existing_tcb = 0;
2450         int send_int_conf = 0;
2451 #ifdef INET
2452         struct sockaddr_in sin;
2453 #endif
2454 #ifdef INET6
2455         struct sockaddr_in6 sin6;
2456 #endif
2457
2458         SCTPDBG(SCTP_DEBUG_INPUT2,
2459             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2460
2461         if (inp_p == NULL) {
2462                 return (NULL);
2463         }
2464         cookie = &cp->cookie;
2465         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2466         cookie_len = ntohs(cp->ch.chunk_length);
2467
2468         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2469             sizeof(struct sctp_init_chunk) +
2470             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2471                 /* cookie too small */
2472                 return (NULL);
2473         }
2474         if ((cookie->peerport != sh->src_port) ||
2475             (cookie->myport != sh->dest_port) ||
2476             (cookie->my_vtag != sh->v_tag)) {
2477                 /*
2478                  * invalid ports or bad tag.  Note that we always leave the
2479                  * v_tag in the header in network order and when we stored
2480                  * it in the my_vtag slot we also left it in network order.
2481                  * This maintains the match even though it may be in the
2482                  * opposite byte order of the machine :->
2483                  */
2484                 return (NULL);
2485         }
2486         /*
2487          * split off the signature into its own mbuf (since it should not be
2488          * calculated in the sctp_hmac_m() call).
2489          */
2490         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2491         m_sig = m_split(m, sig_offset, M_NOWAIT);
2492         if (m_sig == NULL) {
2493                 /* out of memory or ?? */
2494                 return (NULL);
2495         }
2496 #ifdef SCTP_MBUF_LOGGING
2497         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2498                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2499         }
2500 #endif
2501
2502         /*
2503          * compute the signature/digest for the cookie
2504          */
2505         ep = &(*inp_p)->sctp_ep;
2506         l_inp = *inp_p;
2507         if (l_stcb) {
2508                 SCTP_TCB_UNLOCK(l_stcb);
2509         }
2510         SCTP_INP_RLOCK(l_inp);
2511         if (l_stcb) {
2512                 SCTP_TCB_LOCK(l_stcb);
2513         }
2514         /* which cookie is it? */
2515         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2516             (ep->current_secret_number != ep->last_secret_number)) {
2517                 /* it's the old cookie */
2518                 (void)sctp_hmac_m(SCTP_HMAC,
2519                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2520                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2521         } else {
2522                 /* it's the current cookie */
2523                 (void)sctp_hmac_m(SCTP_HMAC,
2524                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2525                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2526         }
2527         /* get the signature */
2528         SCTP_INP_RUNLOCK(l_inp);
2529         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2530         if (sig == NULL) {
2531                 /* couldn't find signature */
2532                 sctp_m_freem(m_sig);
2533                 return (NULL);
2534         }
2535         /* compare the received digest with the computed digest */
2536         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2537                 /* try the old cookie? */
2538                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2539                     (ep->current_secret_number != ep->last_secret_number)) {
2540                         /* compute digest with old */
2541                         (void)sctp_hmac_m(SCTP_HMAC,
2542                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2543                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2544                         /* compare */
2545                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2546                                 cookie_ok = 1;
2547                 }
2548         } else {
2549                 cookie_ok = 1;
2550         }
2551
2552         /*
2553          * Now before we continue we must reconstruct our mbuf so that
2554          * normal processing of any other chunks will work.
2555          */
2556         {
2557                 struct mbuf *m_at;
2558
2559                 m_at = m;
2560                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2561                         m_at = SCTP_BUF_NEXT(m_at);
2562                 }
2563                 SCTP_BUF_NEXT(m_at) = m_sig;
2564         }
2565
2566         if (cookie_ok == 0) {
2567                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2568                 SCTPDBG(SCTP_DEBUG_INPUT2,
2569                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2570                     (uint32_t)offset, cookie_offset, sig_offset);
2571                 return (NULL);
2572         }
2573         /*
2574          * check the cookie timestamps to be sure it's not stale
2575          */
2576         (void)SCTP_GETTIME_TIMEVAL(&now);
2577         /* Expire time is in Ticks, so we convert to seconds */
2578         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2579         time_expires.tv_usec = cookie->time_entered.tv_usec;
2580         if (timevalcmp(&now, &time_expires, >)) {
2581                 /* cookie is stale! */
2582                 struct mbuf *op_err;
2583                 struct sctp_error_stale_cookie *cause;
2584                 struct timeval diff;
2585                 uint32_t staleness;
2586
2587                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2588                     0, M_NOWAIT, 1, MT_DATA);
2589                 if (op_err == NULL) {
2590                         /* FOOBAR */
2591                         return (NULL);
2592                 }
2593                 /* Set the len */
2594                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2595                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2596                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2597                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2598                     (sizeof(uint32_t))));
2599                 diff = now;
2600                 timevalsub(&diff, &time_expires);
2601                 if (diff.tv_sec > UINT32_MAX / 1000000) {
2602                         staleness = UINT32_MAX;
2603                 } else {
2604                         staleness = diff.tv_sec * 1000000;
2605                 }
2606                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2607                         staleness += diff.tv_usec;
2608                 } else {
2609                         staleness = UINT32_MAX;
2610                 }
2611                 cause->stale_time = htonl(staleness);
2612                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2613                     mflowtype, mflowid, l_inp->fibnum,
2614                     vrf_id, port);
2615                 return (NULL);
2616         }
2617         /*
2618          * Now we must see with the lookup address if we have an existing
2619          * asoc. This will only happen if we were in the COOKIE-WAIT state
2620          * and a INIT collided with us and somewhere the peer sent the
2621          * cookie on another address besides the single address our assoc
2622          * had for him. In this case we will have one of the tie-tags set at
2623          * least AND the address field in the cookie can be used to look it
2624          * up.
2625          */
2626         to = NULL;
2627         switch (cookie->addr_type) {
2628 #ifdef INET6
2629         case SCTP_IPV6_ADDRESS:
2630                 memset(&sin6, 0, sizeof(sin6));
2631                 sin6.sin6_family = AF_INET6;
2632                 sin6.sin6_len = sizeof(sin6);
2633                 sin6.sin6_port = sh->src_port;
2634                 sin6.sin6_scope_id = cookie->scope_id;
2635                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2636                     sizeof(sin6.sin6_addr.s6_addr));
2637                 to = (struct sockaddr *)&sin6;
2638                 break;
2639 #endif
2640 #ifdef INET
2641         case SCTP_IPV4_ADDRESS:
2642                 memset(&sin, 0, sizeof(sin));
2643                 sin.sin_family = AF_INET;
2644                 sin.sin_len = sizeof(sin);
2645                 sin.sin_port = sh->src_port;
2646                 sin.sin_addr.s_addr = cookie->address[0];
2647                 to = (struct sockaddr *)&sin;
2648                 break;
2649 #endif
2650         default:
2651                 /* This should not happen */
2652                 return (NULL);
2653         }
2654         if (*stcb == NULL) {
2655                 /* Yep, lets check */
2656                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2657                 if (*stcb == NULL) {
2658                         /*
2659                          * We should have only got back the same inp. If we
2660                          * got back a different ep we have a problem. The
2661                          * original findep got back l_inp and now
2662                          */
2663                         if (l_inp != *inp_p) {
2664                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2665                         }
2666                 } else {
2667                         if (*locked_tcb == NULL) {
2668                                 /*
2669                                  * In this case we found the assoc only
2670                                  * after we locked the create lock. This
2671                                  * means we are in a colliding case and we
2672                                  * must make sure that we unlock the tcb if
2673                                  * its one of the cases where we throw away
2674                                  * the incoming packets.
2675                                  */
2676                                 *locked_tcb = *stcb;
2677
2678                                 /*
2679                                  * We must also increment the inp ref count
2680                                  * since the ref_count flags was set when we
2681                                  * did not find the TCB, now we found it
2682                                  * which reduces the refcount.. we must
2683                                  * raise it back out to balance it all :-)
2684                                  */
2685                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2686                                 if ((*stcb)->sctp_ep != l_inp) {
2687                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2688                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2689                                 }
2690                         }
2691                 }
2692         }
2693         cookie_len -= SCTP_SIGNATURE_SIZE;
2694         if (*stcb == NULL) {
2695                 /* this is the "normal" case... get a new TCB */
2696                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2697                     cookie, cookie_len, *inp_p,
2698                     netp, to, &notification,
2699                     auth_skipped, auth_offset, auth_len,
2700                     mflowtype, mflowid,
2701                     vrf_id, port);
2702         } else {
2703                 /* this is abnormal... cookie-echo on existing TCB */
2704                 had_a_existing_tcb = 1;
2705                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2706                     src, dst, sh,
2707                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2708                     &notification, auth_skipped, auth_offset, auth_len,
2709                     mflowtype, mflowid,
2710                     vrf_id, port);
2711         }
2712
2713         if (*stcb == NULL) {
2714                 /* still no TCB... must be bad cookie-echo */
2715                 return (NULL);
2716         }
2717         if (*netp != NULL) {
2718                 (*netp)->flowtype = mflowtype;
2719                 (*netp)->flowid = mflowid;
2720         }
2721         /*
2722          * Ok, we built an association so confirm the address we sent the
2723          * INIT-ACK to.
2724          */
2725         netl = sctp_findnet(*stcb, to);
2726         /*
2727          * This code should in theory NOT run but
2728          */
2729         if (netl == NULL) {
2730                 /* TSNH! Huh, why do I need to add this address here? */
2731                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2732                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2733                         return (NULL);
2734                 }
2735                 netl = sctp_findnet(*stcb, to);
2736         }
2737         if (netl) {
2738                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2739                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2740                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2741                             netl);
2742                         send_int_conf = 1;
2743                 }
2744         }
2745         sctp_start_net_timers(*stcb);
2746         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2747                 if (!had_a_existing_tcb ||
2748                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2749                         /*
2750                          * If we have a NEW cookie or the connect never
2751                          * reached the connected state during collision we
2752                          * must do the TCP accept thing.
2753                          */
2754                         struct socket *so, *oso;
2755                         struct sctp_inpcb *inp;
2756
2757                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2758                                 /*
2759                                  * For a restart we will keep the same
2760                                  * socket, no need to do anything. I THINK!!
2761                                  */
2762                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2763                                 if (send_int_conf) {
2764                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2765                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2766                                 }
2767                                 return (m);
2768                         }
2769                         oso = (*inp_p)->sctp_socket;
2770                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2771                         SCTP_TCB_UNLOCK((*stcb));
2772                         CURVNET_SET(oso->so_vnet);
2773                         so = sonewconn(oso, 0
2774                             );
2775                         CURVNET_RESTORE();
2776                         SCTP_TCB_LOCK((*stcb));
2777                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2778
2779                         if (so == NULL) {
2780                                 struct mbuf *op_err;
2781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2782                                 struct socket *pcb_so;
2783 #endif
2784                                 /* Too many sockets */
2785                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2786                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2787                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2788                                     src, dst, sh, op_err,
2789                                     mflowtype, mflowid,
2790                                     vrf_id, port);
2791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2792                                 pcb_so = SCTP_INP_SO(*inp_p);
2793                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2794                                 SCTP_TCB_UNLOCK((*stcb));
2795                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2796                                 SCTP_TCB_LOCK((*stcb));
2797                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2798 #endif
2799                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2800                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2801 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2802                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2803 #endif
2804                                 return (NULL);
2805                         }
2806                         inp = (struct sctp_inpcb *)so->so_pcb;
2807                         SCTP_INP_INCR_REF(inp);
2808                         /*
2809                          * We add the unbound flag here so that if we get an
2810                          * soabort() before we get the move_pcb done, we
2811                          * will properly cleanup.
2812                          */
2813                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2814                             SCTP_PCB_FLAGS_CONNECTED |
2815                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2816                             SCTP_PCB_FLAGS_UNBOUND |
2817                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2818                             SCTP_PCB_FLAGS_DONT_WAKE);
2819                         inp->sctp_features = (*inp_p)->sctp_features;
2820                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2821                         inp->sctp_socket = so;
2822                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2823                         inp->max_cwnd = (*inp_p)->max_cwnd;
2824                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2825                         inp->ecn_supported = (*inp_p)->ecn_supported;
2826                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2827                         inp->auth_supported = (*inp_p)->auth_supported;
2828                         inp->asconf_supported = (*inp_p)->asconf_supported;
2829                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2830                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2831                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2832                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2833                         inp->sctp_context = (*inp_p)->sctp_context;
2834                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2835                         inp->fibnum = (*inp_p)->fibnum;
2836                         inp->inp_starting_point_for_iterator = NULL;
2837                         /*
2838                          * copy in the authentication parameters from the
2839                          * original endpoint
2840                          */
2841                         if (inp->sctp_ep.local_hmacs)
2842                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2843                         inp->sctp_ep.local_hmacs =
2844                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2845                         if (inp->sctp_ep.local_auth_chunks)
2846                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2847                         inp->sctp_ep.local_auth_chunks =
2848                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2849
2850                         /*
2851                          * Now we must move it from one hash table to
2852                          * another and get the tcb in the right place.
2853                          */
2854
2855                         /*
2856                          * This is where the one-2-one socket is put into
2857                          * the accept state waiting for the accept!
2858                          */
2859                         if (*stcb) {
2860                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2861                         }
2862                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2863
2864                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2865                         SCTP_TCB_UNLOCK((*stcb));
2866
2867                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2868                             0);
2869                         SCTP_TCB_LOCK((*stcb));
2870                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2871
2872
2873                         /*
2874                          * now we must check to see if we were aborted while
2875                          * the move was going on and the lock/unlock
2876                          * happened.
2877                          */
2878                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2879                                 /*
2880                                  * yep it was, we leave the assoc attached
2881                                  * to the socket since the sctp_inpcb_free()
2882                                  * call will send an abort for us.
2883                                  */
2884                                 SCTP_INP_DECR_REF(inp);
2885                                 return (NULL);
2886                         }
2887                         SCTP_INP_DECR_REF(inp);
2888                         /* Switch over to the new guy */
2889                         *inp_p = inp;
2890                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2891                         if (send_int_conf) {
2892                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2893                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2894                         }
2895                         /*
2896                          * Pull it from the incomplete queue and wake the
2897                          * guy
2898                          */
2899 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2900                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2901                         SCTP_TCB_UNLOCK((*stcb));
2902                         SCTP_SOCKET_LOCK(so, 1);
2903 #endif
2904                         soisconnected(so);
2905 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2906                         SCTP_TCB_LOCK((*stcb));
2907                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2908                         SCTP_SOCKET_UNLOCK(so, 1);
2909 #endif
2910                         return (m);
2911                 }
2912         }
2913         if (notification) {
2914                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2915         }
2916         if (send_int_conf) {
2917                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2918                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2919         }
2920         return (m);
2921 }
2922
2923 static void
2924 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2925     struct sctp_tcb *stcb, struct sctp_nets *net)
2926 {
2927         /* cp must not be used, others call this without a c-ack :-) */
2928         struct sctp_association *asoc;
2929
2930         SCTPDBG(SCTP_DEBUG_INPUT2,
2931             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2932         if ((stcb == NULL) || (net == NULL)) {
2933                 return;
2934         }
2935         asoc = &stcb->asoc;
2936         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2937                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2938                     asoc->overall_error_count,
2939                     0,
2940                     SCTP_FROM_SCTP_INPUT,
2941                     __LINE__);
2942         }
2943         asoc->overall_error_count = 0;
2944         sctp_stop_all_cookie_timers(stcb);
2945         /* process according to association state */
2946         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2947                 /* state change only needed when I am in right state */
2948                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2949                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2950                 sctp_start_net_timers(stcb);
2951                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2952                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2953                             stcb->sctp_ep, stcb, asoc->primary_destination);
2954
2955                 }
2956                 /* update RTO */
2957                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2958                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2959                 if (asoc->overall_error_count == 0) {
2960                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2961                             &asoc->time_entered,
2962                             SCTP_RTT_FROM_NON_DATA);
2963                 }
2964                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2965                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2966                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2967                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2968 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2969                         struct socket *so;
2970
2971 #endif
2972                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2973 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2974                         so = SCTP_INP_SO(stcb->sctp_ep);
2975                         atomic_add_int(&stcb->asoc.refcnt, 1);
2976                         SCTP_TCB_UNLOCK(stcb);
2977                         SCTP_SOCKET_LOCK(so, 1);
2978                         SCTP_TCB_LOCK(stcb);
2979                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2980 #endif
2981                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2982                                 soisconnected(stcb->sctp_socket);
2983                         }
2984 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2985                         SCTP_SOCKET_UNLOCK(so, 1);
2986 #endif
2987                 }
2988                 /*
2989                  * since we did not send a HB make sure we don't double
2990                  * things
2991                  */
2992                 net->hb_responded = 1;
2993
2994                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2995                         /*
2996                          * We don't need to do the asconf thing, nor hb or
2997                          * autoclose if the socket is closed.
2998                          */
2999                         goto closed_socket;
3000                 }
3001                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3002                     stcb, net);
3003
3004
3005                 if (stcb->asoc.sctp_autoclose_ticks &&
3006                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3007                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3008                             stcb->sctp_ep, stcb, NULL);
3009                 }
3010                 /*
3011                  * send ASCONF if parameters are pending and ASCONFs are
3012                  * allowed (eg. addresses changed when init/cookie echo were
3013                  * in flight)
3014                  */
3015                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3016                     (stcb->asoc.asconf_supported == 1) &&
3017                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3018 #ifdef SCTP_TIMER_BASED_ASCONF
3019                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3020                             stcb->sctp_ep, stcb,
3021                             stcb->asoc.primary_destination);
3022 #else
3023                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3024                             SCTP_ADDR_NOT_LOCKED);
3025 #endif
3026                 }
3027         }
3028 closed_socket:
3029         /* Toss the cookie if I can */
3030         sctp_toss_old_cookies(stcb, asoc);
3031         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3032                 /* Restart the timer if we have pending data */
3033                 struct sctp_tmit_chunk *chk;
3034
3035                 chk = TAILQ_FIRST(&asoc->sent_queue);
3036                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3037         }
3038 }
3039
3040 static void
3041 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3042     struct sctp_tcb *stcb)
3043 {
3044         struct sctp_nets *net;
3045         struct sctp_tmit_chunk *lchk;
3046         struct sctp_ecne_chunk bkup;
3047         uint8_t override_bit;
3048         uint32_t tsn, window_data_tsn;
3049         int len;
3050         unsigned int pkt_cnt;
3051
3052         len = ntohs(cp->ch.chunk_length);
3053         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3054             (len != sizeof(struct old_sctp_ecne_chunk))) {
3055                 return;
3056         }
3057         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3058                 /* Its the old format */
3059                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3060                 bkup.num_pkts_since_cwr = htonl(1);
3061                 cp = &bkup;
3062         }
3063         SCTP_STAT_INCR(sctps_recvecne);
3064         tsn = ntohl(cp->tsn);
3065         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3066         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3067         if (lchk == NULL) {
3068                 window_data_tsn = stcb->asoc.sending_seq - 1;
3069         } else {
3070                 window_data_tsn = lchk->rec.data.tsn;
3071         }
3072
3073         /* Find where it was sent to if possible. */
3074         net = NULL;
3075         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3076                 if (lchk->rec.data.tsn == tsn) {
3077                         net = lchk->whoTo;
3078                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3079                         break;
3080                 }
3081                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3082                         break;
3083                 }
3084         }
3085         if (net == NULL) {
3086                 /*
3087                  * What to do. A previous send of a CWR was possibly lost.
3088                  * See how old it is, we may have it marked on the actual
3089                  * net.
3090                  */
3091                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3092                         if (tsn == net->last_cwr_tsn) {
3093                                 /* Found him, send it off */
3094                                 break;
3095                         }
3096                 }
3097                 if (net == NULL) {
3098                         /*
3099                          * If we reach here, we need to send a special CWR
3100                          * that says hey, we did this a long time ago and
3101                          * you lost the response.
3102                          */
3103                         net = TAILQ_FIRST(&stcb->asoc.nets);
3104                         if (net == NULL) {
3105                                 /* TSNH */
3106                                 return;
3107                         }
3108                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3109                 } else {
3110                         override_bit = 0;
3111                 }
3112         } else {
3113                 override_bit = 0;
3114         }
3115         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3116             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3117                 /*
3118                  * JRS - Use the congestion control given in the pluggable
3119                  * CC module
3120                  */
3121                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3122                 /*
3123                  * We reduce once every RTT. So we will only lower cwnd at
3124                  * the next sending seq i.e. the window_data_tsn
3125                  */
3126                 net->cwr_window_tsn = window_data_tsn;
3127                 net->ecn_ce_pkt_cnt += pkt_cnt;
3128                 net->lost_cnt = pkt_cnt;
3129                 net->last_cwr_tsn = tsn;
3130         } else {
3131                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3132                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3133                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3134                         /*
3135                          * Another loss in the same window update how many
3136                          * marks/packets lost we have had.
3137                          */
3138                         int cnt = 1;
3139
3140                         if (pkt_cnt > net->lost_cnt) {
3141                                 /* Should be the case */
3142                                 cnt = (pkt_cnt - net->lost_cnt);
3143                                 net->ecn_ce_pkt_cnt += cnt;
3144                         }
3145                         net->lost_cnt = pkt_cnt;
3146                         net->last_cwr_tsn = tsn;
3147                         /*
3148                          * Most CC functions will ignore this call, since we
3149                          * are in-window yet of the initial CE the peer saw.
3150                          */
3151                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3152                 }
3153         }
3154         /*
3155          * We always send a CWR this way if our previous one was lost our
3156          * peer will get an update, or if it is not time again to reduce we
3157          * still get the cwr to the peer. Note we set the override when we
3158          * could not find the TSN on the chunk or the destination network.
3159          */
3160         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3161 }
3162
3163 static void
3164 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3165 {
3166         /*
3167          * Here we get a CWR from the peer. We must look in the outqueue and
3168          * make sure that we have a covered ECNE in the control chunk part.
3169          * If so remove it.
3170          */
3171         struct sctp_tmit_chunk *chk, *nchk;
3172         struct sctp_ecne_chunk *ecne;
3173         int override;
3174         uint32_t cwr_tsn;
3175
3176         cwr_tsn = ntohl(cp->tsn);
3177         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3178         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3179                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3180                         continue;
3181                 }
3182                 if ((override == 0) && (chk->whoTo != net)) {
3183                         /* Must be from the right src unless override is set */
3184                         continue;
3185                 }
3186                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3187                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3188                         /* this covers this ECNE, we can remove it */
3189                         stcb->asoc.ecn_echo_cnt_onq--;
3190                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3191                             sctp_next);
3192                         sctp_m_freem(chk->data);
3193                         chk->data = NULL;
3194                         stcb->asoc.ctrl_queue_cnt--;
3195                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3196                         if (override == 0) {
3197                                 break;
3198                         }
3199                 }
3200         }
3201 }
3202
3203 static void
3204 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3205     struct sctp_tcb *stcb, struct sctp_nets *net)
3206 {
3207         struct sctp_association *asoc;
3208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3209         struct socket *so;
3210 #endif
3211
3212         SCTPDBG(SCTP_DEBUG_INPUT2,
3213             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3214         if (stcb == NULL)
3215                 return;
3216
3217         asoc = &stcb->asoc;
3218         /* process according to association state */
3219         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3220                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3221                 SCTPDBG(SCTP_DEBUG_INPUT2,
3222                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3223                 SCTP_TCB_UNLOCK(stcb);
3224                 return;
3225         }
3226         /* notify upper layer protocol */
3227         if (stcb->sctp_socket) {
3228                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3229         }
3230 #ifdef INVARIANTS
3231         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3232             !TAILQ_EMPTY(&asoc->sent_queue) ||
3233             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3234                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3235         }
3236 #endif
3237         /* stop the timer */
3238         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3239             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3240         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3241         /* free the TCB */
3242         SCTPDBG(SCTP_DEBUG_INPUT2,
3243             "sctp_handle_shutdown_complete: calls free-asoc\n");
3244 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3245         so = SCTP_INP_SO(stcb->sctp_ep);
3246         atomic_add_int(&stcb->asoc.refcnt, 1);
3247         SCTP_TCB_UNLOCK(stcb);
3248         SCTP_SOCKET_LOCK(so, 1);
3249         SCTP_TCB_LOCK(stcb);
3250         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3251 #endif
3252         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3253             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3254 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3255         SCTP_SOCKET_UNLOCK(so, 1);
3256 #endif
3257         return;
3258 }
3259
3260 static int
3261 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3262     struct sctp_nets *net, uint8_t flg)
3263 {
3264         switch (desc->chunk_type) {
3265         case SCTP_DATA:
3266                 /* find the tsn to resend (possibly */
3267                 {
3268                         uint32_t tsn;
3269                         struct sctp_tmit_chunk *tp1;
3270
3271                         tsn = ntohl(desc->tsn_ifany);
3272                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3273                                 if (tp1->rec.data.tsn == tsn) {
3274                                         /* found it */
3275                                         break;
3276                                 }
3277                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3278                                         /* not found */
3279                                         tp1 = NULL;
3280                                         break;
3281                                 }
3282                         }
3283                         if (tp1 == NULL) {
3284                                 /*
3285                                  * Do it the other way , aka without paying
3286                                  * attention to queue seq order.
3287                                  */
3288                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3289                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3290                                         if (tp1->rec.data.tsn == tsn) {
3291                                                 /* found it */
3292                                                 break;
3293                                         }
3294                                 }
3295                         }
3296                         if (tp1 == NULL) {
3297                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3298                         }
3299                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3300                                 uint8_t *ddp;
3301
3302                                 if (((flg & SCTP_BADCRC) == 0) &&
3303                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3304                                         return (0);
3305                                 }
3306                                 if ((stcb->asoc.peers_rwnd == 0) &&
3307                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3308                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3309                                         return (0);
3310                                 }
3311                                 if (stcb->asoc.peers_rwnd == 0 &&
3312                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3313                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3314                                         return (0);
3315                                 }
3316                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3317                                     sizeof(struct sctp_data_chunk));
3318                                 {
3319                                         unsigned int iii;
3320
3321                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3322                                             iii++) {
3323                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3324                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3325                                                         return (-1);
3326                                                 }
3327                                         }
3328                                 }
3329
3330                                 if (tp1->do_rtt) {
3331                                         /*
3332                                          * this guy had a RTO calculation
3333                                          * pending on it, cancel it
3334                                          */
3335                                         if (tp1->whoTo->rto_needed == 0) {
3336                                                 tp1->whoTo->rto_needed = 1;
3337                                         }
3338                                         tp1->do_rtt = 0;
3339                                 }
3340                                 SCTP_STAT_INCR(sctps_pdrpmark);
3341                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3342                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3343                                 /*
3344                                  * mark it as if we were doing a FR, since
3345                                  * we will be getting gap ack reports behind
3346                                  * the info from the router.
3347                                  */
3348                                 tp1->rec.data.doing_fast_retransmit = 1;
3349                                 /*
3350                                  * mark the tsn with what sequences can
3351                                  * cause a new FR.
3352                                  */
3353                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3354                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3355                                 } else {
3356                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3357                                 }
3358
3359                                 /* restart the timer */
3360                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3361                                     stcb, tp1->whoTo,
3362                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3363                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3364                                     stcb, tp1->whoTo);
3365
3366                                 /* fix counts and things */
3367                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3368                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3369                                             tp1->whoTo->flight_size,
3370                                             tp1->book_size,
3371                                             (uint32_t)(uintptr_t)stcb,
3372                                             tp1->rec.data.tsn);
3373                                 }
3374                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3375                                         sctp_flight_size_decrease(tp1);
3376                                         sctp_total_flight_decrease(stcb, tp1);
3377                                 }
3378                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3379                         } {
3380                                 /* audit code */
3381                                 unsigned int audit;
3382
3383                                 audit = 0;
3384                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3385                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3386                                                 audit++;
3387                                 }
3388                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3389                                     sctp_next) {
3390                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3391                                                 audit++;
3392                                 }
3393                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3394                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3395                                             audit, stcb->asoc.sent_queue_retran_cnt);
3396 #ifndef SCTP_AUDITING_ENABLED
3397                                         stcb->asoc.sent_queue_retran_cnt = audit;
3398 #endif
3399                                 }
3400                         }
3401                 }
3402                 break;
3403         case SCTP_ASCONF:
3404                 {
3405                         struct sctp_tmit_chunk *asconf;
3406
3407                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3408                             sctp_next) {
3409                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3410                                         break;
3411                                 }
3412                         }
3413                         if (asconf) {
3414                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3415                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3416                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3417                                 asconf->snd_count--;
3418                         }
3419                 }
3420                 break;
3421         case SCTP_INITIATION:
3422                 /* resend the INIT */
3423                 stcb->asoc.dropped_special_cnt++;
3424                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3425                         /*
3426                          * If we can get it in, in a few attempts we do
3427                          * this, otherwise we let the timer fire.
3428                          */
3429                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3430                             stcb, net,
3431                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3432                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3433                 }
3434                 break;
3435         case SCTP_SELECTIVE_ACK:
3436         case SCTP_NR_SELECTIVE_ACK:
3437                 /* resend the sack */
3438                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3439                 break;
3440         case SCTP_HEARTBEAT_REQUEST:
3441                 /* resend a demand HB */
3442                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3443                         /*
3444                          * Only retransmit if we KNOW we wont destroy the
3445                          * tcb
3446                          */
3447                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3448                 }
3449                 break;
3450         case SCTP_SHUTDOWN:
3451                 sctp_send_shutdown(stcb, net);
3452                 break;
3453         case SCTP_SHUTDOWN_ACK:
3454                 sctp_send_shutdown_ack(stcb, net);
3455                 break;
3456         case SCTP_COOKIE_ECHO:
3457                 {
3458                         struct sctp_tmit_chunk *cookie;
3459
3460                         cookie = NULL;
3461                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3462                             sctp_next) {
3463                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3464                                         break;
3465                                 }
3466                         }
3467                         if (cookie) {
3468                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3469                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3470                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3471                                 sctp_stop_all_cookie_timers(stcb);
3472                         }
3473                 }
3474                 break;
3475         case SCTP_COOKIE_ACK:
3476                 sctp_send_cookie_ack(stcb);
3477                 break;
3478         case SCTP_ASCONF_ACK:
3479                 /* resend last asconf ack */
3480                 sctp_send_asconf_ack(stcb);
3481                 break;
3482         case SCTP_IFORWARD_CUM_TSN:
3483         case SCTP_FORWARD_CUM_TSN:
3484                 send_forward_tsn(stcb, &stcb->asoc);
3485                 break;
3486                 /* can't do anything with these */
3487         case SCTP_PACKET_DROPPED:
3488         case SCTP_INITIATION_ACK:       /* this should not happen */
3489         case SCTP_HEARTBEAT_ACK:
3490         case SCTP_ABORT_ASSOCIATION:
3491         case SCTP_OPERATION_ERROR:
3492         case SCTP_SHUTDOWN_COMPLETE:
3493         case SCTP_ECN_ECHO:
3494         case SCTP_ECN_CWR:
3495         default:
3496                 break;
3497         }
3498         return (0);
3499 }
3500
3501 void
3502 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3503 {
3504         uint32_t i;
3505         uint16_t temp;
3506
3507         /*
3508          * We set things to 0xffffffff since this is the last delivered
3509          * sequence and we will be sending in 0 after the reset.
3510          */
3511
3512         if (number_entries) {
3513                 for (i = 0; i < number_entries; i++) {
3514                         temp = ntohs(list[i]);
3515                         if (temp >= stcb->asoc.streamincnt) {
3516                                 continue;
3517                         }
3518                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3519                 }
3520         } else {
3521                 list = NULL;
3522                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3523                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3524                 }
3525         }
3526         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3527 }
3528
3529 static void
3530 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3531 {
3532         uint32_t i;
3533         uint16_t temp;
3534
3535         if (number_entries > 0) {
3536                 for (i = 0; i < number_entries; i++) {
3537                         temp = ntohs(list[i]);
3538                         if (temp >= stcb->asoc.streamoutcnt) {
3539                                 /* no such stream */
3540                                 continue;
3541                         }
3542                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3543                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3544                 }
3545         } else {
3546                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3547                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3548                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3549                 }
3550         }
3551         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3552 }
3553
3554 static void
3555 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3556 {
3557         uint32_t i;
3558         uint16_t temp;
3559
3560         if (number_entries > 0) {
3561                 for (i = 0; i < number_entries; i++) {
3562                         temp = ntohs(list[i]);
3563                         if (temp >= stcb->asoc.streamoutcnt) {
3564                                 /* no such stream */
3565                                 continue;
3566                         }
3567                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3568                 }
3569         } else {
3570                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3571                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3572                 }
3573         }
3574 }
3575
3576
3577 struct sctp_stream_reset_request *
3578 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3579 {
3580         struct sctp_association *asoc;
3581         struct sctp_chunkhdr *ch;
3582         struct sctp_stream_reset_request *r;
3583         struct sctp_tmit_chunk *chk;
3584         int len, clen;
3585
3586         asoc = &stcb->asoc;
3587         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3588                 asoc->stream_reset_outstanding = 0;
3589                 return (NULL);
3590         }
3591         if (stcb->asoc.str_reset == NULL) {
3592                 asoc->stream_reset_outstanding = 0;
3593                 return (NULL);
3594         }
3595         chk = stcb->asoc.str_reset;
3596         if (chk->data == NULL) {
3597                 return (NULL);
3598         }
3599         if (bchk) {
3600                 /* he wants a copy of the chk pointer */
3601                 *bchk = chk;
3602         }
3603         clen = chk->send_size;
3604         ch = mtod(chk->data, struct sctp_chunkhdr *);
3605         r = (struct sctp_stream_reset_request *)(ch + 1);
3606         if (ntohl(r->request_seq) == seq) {
3607                 /* found it */
3608                 return (r);
3609         }
3610         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3611         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3612                 /* move to the next one, there can only be a max of two */
3613                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3614                 if (ntohl(r->request_seq) == seq) {
3615                         return (r);
3616                 }
3617         }
3618         /* that seq is not here */
3619         return (NULL);
3620 }
3621
3622 static void
3623 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3624 {
3625         struct sctp_association *asoc;
3626         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3627
3628         if (stcb->asoc.str_reset == NULL) {
3629                 return;
3630         }
3631         asoc = &stcb->asoc;
3632
3633         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3634             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3635         TAILQ_REMOVE(&asoc->control_send_queue,
3636             chk,
3637             sctp_next);
3638         if (chk->data) {
3639                 sctp_m_freem(chk->data);
3640                 chk->data = NULL;
3641         }
3642         asoc->ctrl_queue_cnt--;
3643         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3644         /* sa_ignore NO_NULL_CHK */
3645         stcb->asoc.str_reset = NULL;
3646 }
3647
3648
3649 static int
3650 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3651     uint32_t seq, uint32_t action,
3652     struct sctp_stream_reset_response *respin)
3653 {
3654         uint16_t type;
3655         int lparam_len;
3656         struct sctp_association *asoc = &stcb->asoc;
3657         struct sctp_tmit_chunk *chk;
3658         struct sctp_stream_reset_request *req_param;
3659         struct sctp_stream_reset_out_request *req_out_param;
3660         struct sctp_stream_reset_in_request *req_in_param;
3661         uint32_t number_entries;
3662
3663         if (asoc->stream_reset_outstanding == 0) {
3664                 /* duplicate */
3665                 return (0);
3666         }
3667         if (seq == stcb->asoc.str_reset_seq_out) {
3668                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3669                 if (req_param != NULL) {
3670                         stcb->asoc.str_reset_seq_out++;
3671                         type = ntohs(req_param->ph.param_type);
3672                         lparam_len = ntohs(req_param->ph.param_length);
3673                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3674                                 int no_clear = 0;
3675
3676                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3677                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3678                                 asoc->stream_reset_out_is_outstanding = 0;
3679                                 if (asoc->stream_reset_outstanding)
3680                                         asoc->stream_reset_outstanding--;
3681                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3682                                         /* do it */
3683                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3684                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3685                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3686                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3687                                         /*
3688                                          * Set it up so we don't stop
3689                                          * retransmitting
3690                                          */
3691                                         asoc->stream_reset_outstanding++;
3692                                         stcb->asoc.str_reset_seq_out--;
3693                                         asoc->stream_reset_out_is_outstanding = 1;
3694                                         no_clear = 1;
3695                                 } else {
3696                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3697                                 }
3698                                 if (no_clear == 0) {
3699                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3700                                 }
3701                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3702                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3703                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3704                                 if (asoc->stream_reset_outstanding)
3705                                         asoc->stream_reset_outstanding--;
3706                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3707                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3708                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3709                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3710                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3711                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3712                                 }
3713                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3714                                 /* Ok we now may have more streams */
3715                                 int num_stream;
3716
3717                                 num_stream = stcb->asoc.strm_pending_add_size;
3718                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3719                                         /* TSNH */
3720                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3721                                 }
3722                                 stcb->asoc.strm_pending_add_size = 0;
3723                                 if (asoc->stream_reset_outstanding)
3724                                         asoc->stream_reset_outstanding--;
3725                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3726                                         /* Put the new streams into effect */
3727                                         int i;
3728
3729                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3730                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3731                                         }
3732                                         asoc->streamoutcnt += num_stream;
3733                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3734                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3735                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3736                                             SCTP_STREAM_CHANGE_DENIED);
3737                                 } else {
3738                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3739                                             SCTP_STREAM_CHANGE_FAILED);
3740                                 }
3741                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3742                                 if (asoc->stream_reset_outstanding)
3743                                         asoc->stream_reset_outstanding--;
3744                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3745                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3746                                             SCTP_STREAM_CHANGE_DENIED);
3747                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3748                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3749                                             SCTP_STREAM_CHANGE_FAILED);
3750                                 }
3751                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3752                                 /**
3753                                  * a) Adopt the new in tsn.
3754                                  * b) reset the map
3755                                  * c) Adopt the new out-tsn
3756                                  */
3757                                 struct sctp_stream_reset_response_tsn *resp;
3758                                 struct sctp_forward_tsn_chunk fwdtsn;
3759                                 int abort_flag = 0;
3760
3761                                 if (respin == NULL) {
3762                                         /* huh ? */
3763                                         return (0);
3764                                 }
3765                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3766                                         return (0);
3767                                 }
3768                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3769                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3770                                         asoc->stream_reset_outstanding--;
3771                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3772                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3773                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3774                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3775                                         if (abort_flag) {
3776                                                 return (1);
3777                                         }
3778                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3779                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3780                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3781                                         }
3782                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3783                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3784                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3785
3786                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3787                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3788
3789                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3790                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3791
3792                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3793                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3794                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3795                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3796                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3797                                             SCTP_ASSOC_RESET_DENIED);
3798                                 } else {
3799                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3800                                             SCTP_ASSOC_RESET_FAILED);
3801                                 }
3802                         }
3803                         /* get rid of the request and get the request flags */
3804                         if (asoc->stream_reset_outstanding == 0) {
3805                                 sctp_clean_up_stream_reset(stcb);
3806                         }
3807                 }
3808         }
3809         if (asoc->stream_reset_outstanding == 0) {
3810                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3811         }
3812         return (0);
3813 }
3814
3815 static void
3816 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3817     struct sctp_tmit_chunk *chk,
3818     struct sctp_stream_reset_in_request *req, int trunc)
3819 {
3820         uint32_t seq;
3821         int len, i;
3822         int number_entries;
3823         uint16_t temp;
3824
3825         /*
3826          * peer wants me to send a str-reset to him for my outgoing seq's if
3827          * seq_in is right.
3828          */
3829         struct sctp_association *asoc = &stcb->asoc;
3830
3831         seq = ntohl(req->request_seq);
3832         if (asoc->str_reset_seq_in == seq) {
3833                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3834                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3835                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3836                 } else if (trunc) {
3837                         /* Can't do it, since they exceeded our buffer size  */
3838                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3839                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3840                         len = ntohs(req->ph.param_length);
3841                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3842                         if (number_entries) {
3843                                 for (i = 0; i < number_entries; i++) {
3844                                         temp = ntohs(req->list_of_streams[i]);
3845                                         if (temp >= stcb->asoc.streamoutcnt) {
3846                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3847                                                 goto bad_boy;
3848                                         }
3849                                         req->list_of_streams[i] = temp;
3850                                 }
3851                                 for (i = 0; i < number_entries; i++) {
3852                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3853                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3854                                         }
3855                                 }
3856                         } else {
3857                                 /* Its all */
3858                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3859                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3860                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3861                                 }
3862                         }
3863                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3864                 } else {
3865                         /* Can't do it, since we have sent one out */
3866                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3867                 }
3868 bad_boy:
3869                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3870                 asoc->str_reset_seq_in++;
3871         } else if (asoc->str_reset_seq_in - 1 == seq) {
3872                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3873         } else if (asoc->str_reset_seq_in - 2 == seq) {
3874                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3875         } else {
3876                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3877         }
3878         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3879 }
3880
3881 static int
3882 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3883     struct sctp_tmit_chunk *chk,
3884     struct sctp_stream_reset_tsn_request *req)
3885 {
3886         /* reset all in and out and update the tsn */
3887         /*
3888          * A) reset my str-seq's on in and out. B) Select a receive next,
3889          * and set cum-ack to it. Also process this selected number as a
3890          * fwd-tsn as well. C) set in the response my next sending seq.
3891          */
3892         struct sctp_forward_tsn_chunk fwdtsn;
3893         struct sctp_association *asoc = &stcb->asoc;
3894         int abort_flag = 0;
3895         uint32_t seq;
3896
3897         seq = ntohl(req->request_seq);
3898         if (asoc->str_reset_seq_in == seq) {
3899                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3900                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3901                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3902                 } else {
3903                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3904                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3905                         fwdtsn.ch.chunk_flags = 0;
3906                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3907                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3908                         if (abort_flag) {
3909                                 return (1);
3910                         }
3911                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3912                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3913                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3914                         }
3915                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3916                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3917                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3918                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3919                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3920                         atomic_add_int(&asoc->sending_seq, 1);
3921                         /* save off historical data for retrans */
3922                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3923                         asoc->last_sending_seq[0] = asoc->sending_seq;
3924                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3925                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3926                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3927                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3928                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3929                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3930                 }
3931                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3932                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3933                 asoc->str_reset_seq_in++;
3934         } else if (asoc->str_reset_seq_in - 1 == seq) {
3935                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3936                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3937         } else if (asoc->str_reset_seq_in - 2 == seq) {
3938                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3939                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3940         } else {
3941                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3942         }
3943         return (0);
3944 }
3945
3946 static void
3947 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3948     struct sctp_tmit_chunk *chk,
3949     struct sctp_stream_reset_out_request *req, int trunc)
3950 {
3951         uint32_t seq, tsn;
3952         int number_entries, len;
3953         struct sctp_association *asoc = &stcb->asoc;
3954
3955         seq = ntohl(req->request_seq);
3956
3957         /* now if its not a duplicate we process it */
3958         if (asoc->str_reset_seq_in == seq) {
3959                 len = ntohs(req->ph.param_length);
3960                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3961                 /*
3962                  * the sender is resetting, handle the list issue.. we must
3963                  * a) verify if we can do the reset, if so no problem b) If
3964                  * we can't do the reset we must copy the request. c) queue
3965                  * it, and setup the data in processor to trigger it off
3966                  * when needed and dequeue all the queued data.
3967                  */
3968                 tsn = ntohl(req->send_reset_at_tsn);
3969
3970                 /* move the reset action back one */
3971                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3972                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3973                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3974                 } else if (trunc) {
3975                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3976                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3977                         /* we can do it now */
3978                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3979                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3980                 } else {
3981                         /*
3982                          * we must queue it up and thus wait for the TSN's
3983                          * to arrive that are at or before tsn
3984                          */
3985                         struct sctp_stream_reset_list *liste;
3986                         int siz;
3987
3988                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3989                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3990                             siz, SCTP_M_STRESET);
3991                         if (liste == NULL) {
3992                                 /* gak out of memory */
3993                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3994                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3995                                 return;
3996                         }
3997                         liste->seq = seq;
3998                         liste->tsn = tsn;
3999                         liste->number_entries = number_entries;
4000                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4001                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4002                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
4003                 }
4004                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4005                 asoc->str_reset_seq_in++;
4006         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4007                 /*
4008                  * one seq back, just echo back last action since my
4009                  * response was lost.
4010                  */
4011                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4012         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4013                 /*
4014                  * two seq back, just echo back last action since my
4015                  * response was lost.
4016                  */
4017                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4018         } else {
4019                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4020         }
4021 }
4022
4023 static void
4024 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4025     struct sctp_stream_reset_add_strm *str_add)
4026 {
4027         /*
4028          * Peer is requesting to add more streams. If its within our
4029          * max-streams we will allow it.
4030          */
4031         uint32_t num_stream, i;
4032         uint32_t seq;
4033         struct sctp_association *asoc = &stcb->asoc;
4034         struct sctp_queued_to_read *ctl, *nctl;
4035
4036         /* Get the number. */
4037         seq = ntohl(str_add->request_seq);
4038         num_stream = ntohs(str_add->number_of_streams);
4039         /* Now what would be the new total? */
4040         if (asoc->str_reset_seq_in == seq) {
4041                 num_stream += stcb->asoc.streamincnt;
4042                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4043                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4044                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4045                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4046                     (num_stream > 0xffff)) {
4047                         /* We must reject it they ask for to many */
4048         denied:
4049                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4050                 } else {
4051                         /* Ok, we can do that :-) */
4052                         struct sctp_stream_in *oldstrm;
4053
4054                         /* save off the old */
4055                         oldstrm = stcb->asoc.strmin;
4056                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4057                             (num_stream * sizeof(struct sctp_stream_in)),
4058                             SCTP_M_STRMI);
4059                         if (stcb->asoc.strmin == NULL) {
4060                                 stcb->asoc.strmin = oldstrm;
4061                                 goto denied;
4062                         }
4063                         /* copy off the old data */
4064                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4065                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4066                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4067                                 stcb->asoc.strmin[i].sid = i;
4068                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4069                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4070                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4071                                 /* now anything on those queues? */
4072                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4073                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4074                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4075                                 }
4076                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4077                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4078                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4079                                 }
4080                         }
4081                         /* Init the new streams */
4082                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4083                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4084                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4085                                 stcb->asoc.strmin[i].sid = i;
4086                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4087                                 stcb->asoc.strmin[i].pd_api_started = 0;
4088                                 stcb->asoc.strmin[i].delivery_started = 0;
4089                         }
4090                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4091                         /* update the size */
4092                         stcb->asoc.streamincnt = num_stream;
4093                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4094                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4095                 }
4096                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4097                 asoc->str_reset_seq_in++;
4098         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4099                 /*
4100                  * one seq back, just echo back last action since my
4101                  * response was lost.
4102                  */
4103                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4104         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4105                 /*
4106                  * two seq back, just echo back last action since my
4107                  * response was lost.
4108                  */
4109                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4110         } else {
4111                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4112
4113         }
4114 }
4115
4116 static void
4117 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4118     struct sctp_stream_reset_add_strm *str_add)
4119 {
4120         /*
4121          * Peer is requesting to add more streams. If its within our
4122          * max-streams we will allow it.
4123          */
4124         uint16_t num_stream;
4125         uint32_t seq;
4126         struct sctp_association *asoc = &stcb->asoc;
4127
4128         /* Get the number. */
4129         seq = ntohl(str_add->request_seq);
4130         num_stream = ntohs(str_add->number_of_streams);
4131         /* Now what would be the new total? */
4132         if (asoc->str_reset_seq_in == seq) {
4133                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4134                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4135                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4136                 } else if (stcb->asoc.stream_reset_outstanding) {
4137                         /* We must reject it we have something pending */
4138                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4139                 } else {
4140                         /* Ok, we can do that :-) */
4141                         int mychk;
4142
4143                         mychk = stcb->asoc.streamoutcnt;
4144                         mychk += num_stream;
4145                         if (mychk < 0x10000) {
4146                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4147                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4148                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4149                                 }
4150                         } else {
4151                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4152                         }
4153                 }
4154                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4155                 asoc->str_reset_seq_in++;
4156         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4157                 /*
4158                  * one seq back, just echo back last action since my
4159                  * response was lost.
4160                  */
4161                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4162         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4163                 /*
4164                  * two seq back, just echo back last action since my
4165                  * response was lost.
4166                  */
4167                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4168         } else {
4169                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4170         }
4171 }
4172
4173 #ifdef __GNUC__
4174 __attribute__((noinline))
4175 #endif
4176 static int
4177 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4178     struct sctp_chunkhdr *ch_req)
4179 {
4180         uint16_t remaining_length, param_len, ptype;
4181         struct sctp_paramhdr pstore;
4182         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4183         uint32_t seq = 0;
4184         int num_req = 0;
4185         int trunc = 0;
4186         struct sctp_tmit_chunk *chk;
4187         struct sctp_chunkhdr *ch;
4188         struct sctp_paramhdr *ph;
4189         int ret_code = 0;
4190         int num_param = 0;
4191
4192         /* now it may be a reset or a reset-response */
4193         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4194
4195         /* setup for adding the response */
4196         sctp_alloc_a_chunk(stcb, chk);
4197         if (chk == NULL) {
4198                 return (ret_code);
4199         }
4200         chk->copy_by_ref = 0;
4201         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4202         chk->rec.chunk_id.can_take_data = 0;
4203         chk->flags = 0;
4204         chk->asoc = &stcb->asoc;
4205         chk->no_fr_allowed = 0;
4206         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4207         chk->book_size_scale = 0;
4208         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4209         if (chk->data == NULL) {
4210 strres_nochunk:
4211                 if (chk->data) {
4212                         sctp_m_freem(chk->data);
4213                         chk->data = NULL;
4214                 }
4215                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4216                 return (ret_code);
4217         }
4218         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4219
4220         /* setup chunk parameters */
4221         chk->sent = SCTP_DATAGRAM_UNSENT;
4222         chk->snd_count = 0;
4223         chk->whoTo = NULL;
4224
4225         ch = mtod(chk->data, struct sctp_chunkhdr *);
4226         ch->chunk_type = SCTP_STREAM_RESET;
4227         ch->chunk_flags = 0;
4228         ch->chunk_length = htons(chk->send_size);
4229         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4230         offset += sizeof(struct sctp_chunkhdr);
4231         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4232                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4233                 if (ph == NULL) {
4234                         /* TSNH */
4235                         break;
4236                 }
4237                 param_len = ntohs(ph->param_length);
4238                 if ((param_len > remaining_length) ||
4239                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4240                         /* bad parameter length */
4241                         break;
4242                 }
4243                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4244                     (uint8_t *)&cstore);
4245                 if (ph == NULL) {
4246                         /* TSNH */
4247                         break;
4248                 }
4249                 ptype = ntohs(ph->param_type);
4250                 num_param++;
4251                 if (param_len > sizeof(cstore)) {
4252                         trunc = 1;
4253                 } else {
4254                         trunc = 0;
4255                 }
4256                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4257                         /* hit the max of parameters already sorry.. */
4258                         break;
4259                 }
4260                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4261                         struct sctp_stream_reset_out_request *req_out;
4262
4263                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4264                                 break;
4265                         }
4266                         req_out = (struct sctp_stream_reset_out_request *)ph;
4267                         num_req++;
4268                         if (stcb->asoc.stream_reset_outstanding) {
4269                                 seq = ntohl(req_out->response_seq);
4270                                 if (seq == stcb->asoc.str_reset_seq_out) {
4271                                         /* implicit ack */
4272                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4273                                 }
4274                         }
4275                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4276                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4277                         struct sctp_stream_reset_add_strm *str_add;
4278
4279                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4280                                 break;
4281                         }
4282                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4283                         num_req++;
4284                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4285                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4286                         struct sctp_stream_reset_add_strm *str_add;
4287
4288                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4289                                 break;
4290                         }
4291                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4292                         num_req++;
4293                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4294                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4295                         struct sctp_stream_reset_in_request *req_in;
4296
4297                         num_req++;
4298                         req_in = (struct sctp_stream_reset_in_request *)ph;
4299                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4300                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4301                         struct sctp_stream_reset_tsn_request *req_tsn;
4302
4303                         num_req++;
4304                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4305                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4306                                 ret_code = 1;
4307                                 goto strres_nochunk;
4308                         }
4309                         /* no more */
4310                         break;
4311                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4312                         struct sctp_stream_reset_response *resp;
4313                         uint32_t result;
4314
4315                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4316                                 break;
4317                         }
4318                         resp = (struct sctp_stream_reset_response *)ph;
4319                         seq = ntohl(resp->response_seq);
4320                         result = ntohl(resp->result);
4321                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4322                                 ret_code = 1;
4323                                 goto strres_nochunk;
4324                         }
4325                 } else {
4326                         break;
4327                 }
4328                 offset += SCTP_SIZE32(param_len);
4329                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4330                         remaining_length -= SCTP_SIZE32(param_len);
4331                 } else {
4332                         remaining_length = 0;
4333                 }
4334         }
4335         if (num_req == 0) {
4336                 /* we have no response free the stuff */
4337                 goto strres_nochunk;
4338         }
4339         /* ok we have a chunk to link in */
4340         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4341             chk,
4342             sctp_next);
4343         stcb->asoc.ctrl_queue_cnt++;
4344         return (ret_code);
4345 }
4346
4347 /*
4348  * Handle a router or endpoints report of a packet loss, there are two ways
4349  * to handle this, either we get the whole packet and must disect it
4350  * ourselves (possibly with truncation and or corruption) or it is a summary
4351  * from a middle box that did the disectting for us.
4352  */
4353 static void
4354 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4355     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4356 {
4357         uint32_t bottle_bw, on_queue;
4358         uint16_t trunc_len;
4359         unsigned int chlen;
4360         unsigned int at;
4361         struct sctp_chunk_desc desc;
4362         struct sctp_chunkhdr *ch;
4363
4364         chlen = ntohs(cp->ch.chunk_length);
4365         chlen -= sizeof(struct sctp_pktdrop_chunk);
4366         /* XXX possible chlen underflow */
4367         if (chlen == 0) {
4368                 ch = NULL;
4369                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4370                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4371         } else {
4372                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4373                 chlen -= sizeof(struct sctphdr);
4374                 /* XXX possible chlen underflow */
4375                 memset(&desc, 0, sizeof(desc));
4376         }
4377         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4378         if (trunc_len > limit) {
4379                 trunc_len = limit;
4380         }
4381         /* now the chunks themselves */
4382         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4383                 desc.chunk_type = ch->chunk_type;
4384                 /* get amount we need to move */
4385                 at = ntohs(ch->chunk_length);
4386                 if (at < sizeof(struct sctp_chunkhdr)) {
4387                         /* corrupt chunk, maybe at the end? */
4388                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4389                         break;
4390                 }
4391                 if (trunc_len == 0) {
4392                         /* we are supposed to have all of it */
4393                         if (at > chlen) {
4394                                 /* corrupt skip it */
4395                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4396                                 break;
4397                         }
4398                 } else {
4399                         /* is there enough of it left ? */
4400                         if (desc.chunk_type == SCTP_DATA) {
4401                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4402                                     sizeof(desc.data_bytes))) {
4403                                         break;
4404                                 }
4405                         } else {
4406                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4407                                         break;
4408                                 }
4409                         }
4410                 }
4411                 if (desc.chunk_type == SCTP_DATA) {
4412                         /* can we get out the tsn? */
4413                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4414                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4415
4416                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4417                                 /* yep */
4418                                 struct sctp_data_chunk *dcp;
4419                                 uint8_t *ddp;
4420                                 unsigned int iii;
4421
4422                                 dcp = (struct sctp_data_chunk *)ch;
4423                                 ddp = (uint8_t *)(dcp + 1);
4424                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4425                                         desc.data_bytes[iii] = ddp[iii];
4426                                 }
4427                                 desc.tsn_ifany = dcp->dp.tsn;
4428                         } else {
4429                                 /* nope we are done. */
4430                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4431                                 break;
4432                         }
4433                 } else {
4434                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4435                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4436                 }
4437
4438                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4439                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4440                         break;
4441                 }
4442                 if (SCTP_SIZE32(at) > chlen) {
4443                         break;
4444                 }
4445                 chlen -= SCTP_SIZE32(at);
4446                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4447                         /* done, none left */
4448                         break;
4449                 }
4450                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4451         }
4452         /* Now update any rwnd --- possibly */
4453         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4454                 /* From a peer, we get a rwnd report */
4455                 uint32_t a_rwnd;
4456
4457                 SCTP_STAT_INCR(sctps_pdrpfehos);
4458
4459                 bottle_bw = ntohl(cp->bottle_bw);
4460                 on_queue = ntohl(cp->current_onq);
4461                 if (bottle_bw && on_queue) {
4462                         /* a rwnd report is in here */
4463                         if (bottle_bw > on_queue)
4464                                 a_rwnd = bottle_bw - on_queue;
4465                         else
4466                                 a_rwnd = 0;
4467
4468                         if (a_rwnd == 0)
4469                                 stcb->asoc.peers_rwnd = 0;
4470                         else {
4471                                 if (a_rwnd > stcb->asoc.total_flight) {
4472                                         stcb->asoc.peers_rwnd =
4473                                             a_rwnd - stcb->asoc.total_flight;
4474                                 } else {
4475                                         stcb->asoc.peers_rwnd = 0;
4476                                 }
4477                                 if (stcb->asoc.peers_rwnd <
4478                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4479                                         /* SWS sender side engages */
4480                                         stcb->asoc.peers_rwnd = 0;
4481                                 }
4482                         }
4483                 }
4484         } else {
4485                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4486         }
4487
4488         /* now middle boxes in sat networks get a cwnd bump */
4489         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4490             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4491             (stcb->asoc.sat_network)) {
4492                 /*
4493                  * This is debatable but for sat networks it makes sense
4494                  * Note if a T3 timer has went off, we will prohibit any
4495                  * changes to cwnd until we exit the t3 loss recovery.
4496                  */
4497                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4498                     net, cp, &bottle_bw, &on_queue);
4499         }
4500 }
4501
4502 /*
4503  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4504  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4505  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4506  * length of the complete packet outputs: - length: modified to remaining
4507  * length after control processing - netp: modified to new sctp_nets after
4508  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4509  * bad packet,...) otherwise return the tcb for this packet
4510  */
4511 #ifdef __GNUC__
4512 __attribute__((noinline))
4513 #endif
4514 static struct sctp_tcb *
4515 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4516     struct sockaddr *src, struct sockaddr *dst,
4517     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4518     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4519     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4520     uint32_t vrf_id, uint16_t port)
4521 {
4522         struct sctp_association *asoc;
4523         struct mbuf *op_err;
4524         char msg[SCTP_DIAG_INFO_LEN];
4525         uint32_t vtag_in;
4526         int num_chunks = 0;     /* number of control chunks processed */
4527         uint32_t chk_length;
4528         int ret;
4529         int abort_no_unlock = 0;
4530         int ecne_seen = 0;
4531
4532         /*
4533          * How big should this be, and should it be alloc'd? Lets try the
4534          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4535          * until we get into jumbo grams and such..
4536          */
4537         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4538         int got_auth = 0;
4539         uint32_t auth_offset = 0, auth_len = 0;
4540         int auth_skipped = 0;
4541         int asconf_cnt = 0;
4542 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4543         struct socket *so;
4544 #endif
4545
4546         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4547             iphlen, *offset, length, (void *)stcb);
4548
4549         if (stcb) {
4550                 SCTP_TCB_LOCK_ASSERT(stcb);
4551         }
4552         /* validate chunk header length... */
4553         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4554                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4555                     ntohs(ch->chunk_length));
4556                 *offset = length;
4557                 return (stcb);
4558         }
4559         /*
4560          * validate the verification tag
4561          */
4562         vtag_in = ntohl(sh->v_tag);
4563
4564         if (ch->chunk_type == SCTP_INITIATION) {
4565                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4566                     ntohs(ch->chunk_length), vtag_in);
4567                 if (vtag_in != 0) {
4568                         /* protocol error- silently discard... */
4569                         SCTP_STAT_INCR(sctps_badvtag);
4570                         if (stcb != NULL) {
4571                                 SCTP_TCB_UNLOCK(stcb);
4572                         }
4573                         return (NULL);
4574                 }
4575         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4576                 /*
4577                  * If there is no stcb, skip the AUTH chunk and process
4578                  * later after a stcb is found (to validate the lookup was
4579                  * valid.
4580                  */
4581                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4582                     (stcb == NULL) &&
4583                     (inp->auth_supported == 1)) {
4584                         /* save this chunk for later processing */
4585                         auth_skipped = 1;
4586                         auth_offset = *offset;
4587                         auth_len = ntohs(ch->chunk_length);
4588
4589                         /* (temporarily) move past this chunk */
4590                         *offset += SCTP_SIZE32(auth_len);
4591                         if (*offset >= length) {
4592                                 /* no more data left in the mbuf chain */
4593                                 *offset = length;
4594                                 return (NULL);
4595                         }
4596                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4597                             sizeof(struct sctp_chunkhdr), chunk_buf);
4598                 }
4599                 if (ch == NULL) {
4600                         /* Help */
4601                         *offset = length;
4602                         return (stcb);
4603                 }
4604                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4605                         goto process_control_chunks;
4606                 }
4607                 /*
4608                  * first check if it's an ASCONF with an unknown src addr we
4609                  * need to look inside to find the association
4610                  */
4611                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4612                         struct sctp_chunkhdr *asconf_ch = ch;
4613                         uint32_t asconf_offset = 0, asconf_len = 0;
4614
4615                         /* inp's refcount may be reduced */
4616                         SCTP_INP_INCR_REF(inp);
4617
4618                         asconf_offset = *offset;
4619                         do {
4620                                 asconf_len = ntohs(asconf_ch->chunk_length);
4621                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4622                                         break;
4623                                 stcb = sctp_findassociation_ep_asconf(m,
4624                                     *offset,
4625                                     dst,
4626                                     sh, &inp, netp, vrf_id);
4627                                 if (stcb != NULL)
4628                                         break;
4629                                 asconf_offset += SCTP_SIZE32(asconf_len);
4630                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4631                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4632                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4633                         if (stcb == NULL) {
4634                                 /*
4635                                  * reduce inp's refcount if not reduced in
4636                                  * sctp_findassociation_ep_asconf().
4637                                  */
4638                                 SCTP_INP_DECR_REF(inp);
4639                         }
4640                         /* now go back and verify any auth chunk to be sure */
4641                         if (auth_skipped && (stcb != NULL)) {
4642                                 struct sctp_auth_chunk *auth;
4643
4644                                 auth = (struct sctp_auth_chunk *)
4645                                     sctp_m_getptr(m, auth_offset,
4646                                     auth_len, chunk_buf);
4647                                 got_auth = 1;
4648                                 auth_skipped = 0;
4649                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4650                                     auth_offset)) {
4651                                         /* auth HMAC failed so dump it */
4652                                         *offset = length;
4653                                         return (stcb);
4654                                 } else {
4655                                         /* remaining chunks are HMAC checked */
4656                                         stcb->asoc.authenticated = 1;
4657                                 }
4658                         }
4659                 }
4660                 if (stcb == NULL) {
4661                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4662                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4663                             msg);
4664                         /* no association, so it's out of the blue... */
4665                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4666                             mflowtype, mflowid, inp->fibnum,
4667                             vrf_id, port);
4668                         *offset = length;
4669                         return (NULL);
4670                 }
4671                 asoc = &stcb->asoc;
4672                 /* ABORT and SHUTDOWN can use either v_tag... */
4673                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4674                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4675                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4676                         /* Take the T-bit always into account. */
4677                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4678                             (vtag_in == asoc->my_vtag)) ||
4679                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4680                             (asoc->peer_vtag != htonl(0)) &&
4681                             (vtag_in == asoc->peer_vtag))) {
4682                                 /* this is valid */
4683                         } else {
4684                                 /* drop this packet... */
4685                                 SCTP_STAT_INCR(sctps_badvtag);
4686                                 if (stcb != NULL) {
4687                                         SCTP_TCB_UNLOCK(stcb);
4688                                 }
4689                                 return (NULL);
4690                         }
4691                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4692                         if (vtag_in != asoc->my_vtag) {
4693                                 /*
4694                                  * this could be a stale SHUTDOWN-ACK or the
4695                                  * peer never got the SHUTDOWN-COMPLETE and
4696                                  * is still hung; we have started a new asoc
4697                                  * but it won't complete until the shutdown
4698                                  * is completed
4699                                  */
4700                                 if (stcb != NULL) {
4701                                         SCTP_TCB_UNLOCK(stcb);
4702                                 }
4703                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4704                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4705                                     msg);
4706                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4707                                     sh, inp, op_err,
4708                                     mflowtype, mflowid, fibnum,
4709                                     vrf_id, port);
4710                                 return (NULL);
4711                         }
4712                 } else {
4713                         /* for all other chunks, vtag must match */
4714                         if (vtag_in != asoc->my_vtag) {
4715                                 /* invalid vtag... */
4716                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4717                                     "invalid vtag: %xh, expect %xh\n",
4718                                     vtag_in, asoc->my_vtag);
4719                                 SCTP_STAT_INCR(sctps_badvtag);
4720                                 if (stcb != NULL) {
4721                                         SCTP_TCB_UNLOCK(stcb);
4722                                 }
4723                                 *offset = length;
4724                                 return (NULL);
4725                         }
4726                 }
4727         }                       /* end if !SCTP_COOKIE_ECHO */
4728         /*
4729          * process all control chunks...
4730          */
4731         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4732             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4733             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4734             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4735                 /* implied cookie-ack.. we must have lost the ack */
4736                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4737                     *netp);
4738         }
4739 process_control_chunks:
4740         while (IS_SCTP_CONTROL(ch)) {
4741                 /* validate chunk length */
4742                 chk_length = ntohs(ch->chunk_length);
4743                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4744                     ch->chunk_type, chk_length);
4745                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4746                 if (chk_length < sizeof(*ch) ||
4747                     (*offset + (int)chk_length) > length) {
4748                         *offset = length;
4749                         return (stcb);
4750                 }
4751                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4752                 /*
4753                  * INIT-ACK only gets the init ack "header" portion only
4754                  * because we don't have to process the peer's COOKIE. All
4755                  * others get a complete chunk.
4756                  */
4757                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4758                     (ch->chunk_type == SCTP_INITIATION)) {
4759                         /* get an init-ack chunk */
4760                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4761                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4762                         if (ch == NULL) {
4763                                 *offset = length;
4764                                 if (stcb != NULL) {
4765                                         SCTP_TCB_UNLOCK(stcb);
4766                                 }
4767                                 return (NULL);
4768                         }
4769                 } else {
4770                         /* For cookies and all other chunks. */
4771                         if (chk_length > sizeof(chunk_buf)) {
4772                                 /*
4773                                  * use just the size of the chunk buffer so
4774                                  * the front part of our chunks fit in
4775                                  * contiguous space up to the chunk buffer
4776                                  * size (508 bytes). For chunks that need to
4777                                  * get more than that they must use the
4778                                  * sctp_m_getptr() function or other means
4779                                  * (e.g. know how to parse mbuf chains).
4780                                  * Cookies do this already.
4781                                  */
4782                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4783                                     (sizeof(chunk_buf) - 4),
4784                                     chunk_buf);
4785                                 if (ch == NULL) {
4786                                         *offset = length;
4787                                         if (stcb != NULL) {
4788                                                 SCTP_TCB_UNLOCK(stcb);
4789                                         }
4790                                         return (NULL);
4791                                 }
4792                         } else {
4793                                 /* We can fit it all */
4794                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4795                                     chk_length, chunk_buf);
4796                                 if (ch == NULL) {
4797                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4798                                         *offset = length;
4799                                         if (stcb != NULL) {
4800                                                 SCTP_TCB_UNLOCK(stcb);
4801                                         }
4802                                         return (NULL);
4803                                 }
4804                         }
4805                 }
4806                 num_chunks++;
4807                 /* Save off the last place we got a control from */
4808                 if (stcb != NULL) {
4809                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4810                                 /*
4811                                  * allow last_control to be NULL if
4812                                  * ASCONF... ASCONF processing will find the
4813                                  * right net later
4814                                  */
4815                                 if ((netp != NULL) && (*netp != NULL))
4816                                         stcb->asoc.last_control_chunk_from = *netp;
4817                         }
4818                 }
4819 #ifdef SCTP_AUDITING_ENABLED
4820                 sctp_audit_log(0xB0, ch->chunk_type);
4821 #endif
4822
4823                 /* check to see if this chunk required auth, but isn't */
4824                 if ((stcb != NULL) &&
4825                     (stcb->asoc.auth_supported == 1) &&
4826                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4827                     !stcb->asoc.authenticated) {
4828                         /* "silently" ignore */
4829                         SCTP_STAT_INCR(sctps_recvauthmissing);
4830                         goto next_chunk;
4831                 }
4832                 switch (ch->chunk_type) {
4833                 case SCTP_INITIATION:
4834                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4835                         /* The INIT chunk must be the only chunk. */
4836                         if ((num_chunks > 1) ||
4837                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4838                                 /* RFC 4960 requires that no ABORT is sent */
4839                                 *offset = length;
4840                                 if (stcb != NULL) {
4841                                         SCTP_TCB_UNLOCK(stcb);
4842                                 }
4843                                 return (NULL);
4844                         }
4845                         /* Honor our resource limit. */
4846                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4847                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4848                                 sctp_abort_association(inp, stcb, m, iphlen,
4849                                     src, dst, sh, op_err,
4850                                     mflowtype, mflowid,
4851                                     vrf_id, port);
4852                                 *offset = length;
4853                                 return (NULL);
4854                         }
4855                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4856                             (struct sctp_init_chunk *)ch, inp,
4857                             stcb, *netp, &abort_no_unlock,
4858                             mflowtype, mflowid,
4859                             vrf_id, port);
4860                         *offset = length;
4861                         if ((!abort_no_unlock) && (stcb != NULL)) {
4862                                 SCTP_TCB_UNLOCK(stcb);
4863                         }
4864                         return (NULL);
4865                         break;
4866                 case SCTP_PAD_CHUNK:
4867                         break;
4868                 case SCTP_INITIATION_ACK:
4869                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4870                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4871                                 /* We are not interested anymore */
4872                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4873                                         ;
4874                                 } else {
4875                                         *offset = length;
4876                                         if (stcb != NULL) {
4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4878                                                 so = SCTP_INP_SO(inp);
4879                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4880                                                 SCTP_TCB_UNLOCK(stcb);
4881                                                 SCTP_SOCKET_LOCK(so, 1);
4882                                                 SCTP_TCB_LOCK(stcb);
4883                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4884 #endif
4885                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4886                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4887 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4888                                                 SCTP_SOCKET_UNLOCK(so, 1);
4889 #endif
4890                                         }
4891                                         return (NULL);
4892                                 }
4893                         }
4894                         /* The INIT-ACK chunk must be the only chunk. */
4895                         if ((num_chunks > 1) ||
4896                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4897                                 *offset = length;
4898                                 return (stcb);
4899                         }
4900                         if ((netp != NULL) && (*netp != NULL)) {
4901                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4902                                     src, dst, sh,
4903                                     (struct sctp_init_ack_chunk *)ch,
4904                                     stcb, *netp,
4905                                     &abort_no_unlock,
4906                                     mflowtype, mflowid,
4907                                     vrf_id);
4908                         } else {
4909                                 ret = -1;
4910                         }
4911                         *offset = length;
4912                         if (abort_no_unlock) {
4913                                 return (NULL);
4914                         }
4915                         /*
4916                          * Special case, I must call the output routine to
4917                          * get the cookie echoed
4918                          */
4919                         if ((stcb != NULL) && (ret == 0)) {
4920                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4921                         }
4922                         return (stcb);
4923                         break;
4924                 case SCTP_SELECTIVE_ACK:
4925                 case SCTP_NR_SELECTIVE_ACK:
4926                         {
4927                                 int abort_now = 0;
4928                                 uint32_t a_rwnd, cum_ack;
4929                                 uint16_t num_seg, num_nr_seg, num_dup;
4930                                 uint8_t flags;
4931                                 int offset_seg, offset_dup;
4932
4933                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4934                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4935                                 SCTP_STAT_INCR(sctps_recvsacks);
4936                                 if (stcb == NULL) {
4937                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4938                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4939                                         break;
4940                                 }
4941                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4942                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4943                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4944                                                 break;
4945                                         }
4946                                 } else {
4947                                         if (stcb->asoc.nrsack_supported == 0) {
4948                                                 goto unknown_chunk;
4949                                         }
4950                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4951                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4952                                                 break;
4953                                         }
4954                                 }
4955                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4956                                         /*-
4957                                          * If we have sent a shutdown-ack, we will pay no
4958                                          * attention to a sack sent in to us since
4959                                          * we don't care anymore.
4960                                          */
4961                                         break;
4962                                 }
4963                                 flags = ch->chunk_flags;
4964                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4965                                         struct sctp_sack_chunk *sack;
4966
4967                                         sack = (struct sctp_sack_chunk *)ch;
4968                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4969                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4970                                         num_nr_seg = 0;
4971                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4972                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4973                                         if (sizeof(struct sctp_sack_chunk) +
4974                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4975                                             num_dup * sizeof(uint32_t) != chk_length) {
4976                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4977                                                 break;
4978                                         }
4979                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4980                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4981                                 } else {
4982                                         struct sctp_nr_sack_chunk *nr_sack;
4983
4984                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4985                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4986                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4987                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4988                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4989                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4990                                         if (sizeof(struct sctp_nr_sack_chunk) +
4991                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4992                                             num_dup * sizeof(uint32_t) != chk_length) {
4993                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4994                                                 break;
4995                                         }
4996                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4997                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4998                                 }
4999                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5000                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
5001                                     cum_ack, num_seg, a_rwnd);
5002                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5003                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5004                                     (num_seg == 0) && (num_nr_seg == 0) &&
5005                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5006                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5007                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5008                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5009                                         /*
5010                                          * We have a SIMPLE sack having no
5011                                          * prior segments and data on sent
5012                                          * queue to be acked. Use the faster
5013                                          * path sack processing. We also
5014                                          * allow window update sacks with no
5015                                          * missing segments to go this way
5016                                          * too.
5017                                          */
5018                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5019                                             &abort_now, ecne_seen);
5020                                 } else {
5021                                         if ((netp != NULL) && (*netp != NULL)) {
5022                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5023                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5024                                                     cum_ack, a_rwnd, ecne_seen);
5025                                         }
5026                                 }
5027                                 if (abort_now) {
5028                                         /* ABORT signal from sack processing */
5029                                         *offset = length;
5030                                         return (NULL);
5031                                 }
5032                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5033                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5034                                     (stcb->asoc.stream_queue_cnt == 0)) {
5035                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5036                                 }
5037                                 break;
5038                         }
5039                 case SCTP_HEARTBEAT_REQUEST:
5040                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5041                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5042                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5043                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5044                                     chk_length, *netp);
5045                         }
5046                         break;
5047                 case SCTP_HEARTBEAT_ACK:
5048                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
5049                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5050                                 /* Its not ours */
5051                                 *offset = length;
5052                                 return (stcb);
5053                         }
5054                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5055                         if ((netp != NULL) && (*netp != NULL)) {
5056                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5057                                     stcb, *netp);
5058                         }
5059                         break;
5060                 case SCTP_ABORT_ASSOCIATION:
5061                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5062                             (void *)stcb);
5063                         *offset = length;
5064                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5065                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
5066                                         return (NULL);
5067                                 } else {
5068                                         return (stcb);
5069                                 }
5070                         } else {
5071                                 return (NULL);
5072                         }
5073                         break;
5074                 case SCTP_SHUTDOWN:
5075                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5076                             (void *)stcb);
5077                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5078                                 *offset = length;
5079                                 return (stcb);
5080                         }
5081                         if ((netp != NULL) && (*netp != NULL)) {
5082                                 int abort_flag = 0;
5083
5084                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5085                                     stcb, *netp, &abort_flag);
5086                                 if (abort_flag) {
5087                                         *offset = length;
5088                                         return (NULL);
5089                                 }
5090                         }
5091                         break;
5092                 case SCTP_SHUTDOWN_ACK:
5093                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
5094                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5095                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5096                         }
5097                         *offset = length;
5098                         return (NULL);
5099                         break;
5100                 case SCTP_OPERATION_ERROR:
5101                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
5102                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
5103                             sctp_handle_error(ch, stcb, *netp) < 0) {
5104                                 *offset = length;
5105                                 return (NULL);
5106                         }
5107                         break;
5108                 case SCTP_COOKIE_ECHO:
5109                         SCTPDBG(SCTP_DEBUG_INPUT3,
5110                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
5111                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
5112                                 ;
5113                         } else {
5114                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5115                                         /* We are not interested anymore */
5116                         abend:
5117                                         if (stcb != NULL) {
5118                                                 SCTP_TCB_UNLOCK(stcb);
5119                                         }
5120                                         *offset = length;
5121                                         return (NULL);
5122                                 }
5123                         }
5124                         /*-
5125                          * First are we accepting? We do this again here
5126                          * since it is possible that a previous endpoint WAS
5127                          * listening responded to a INIT-ACK and then
5128                          * closed. We opened and bound.. and are now no
5129                          * longer listening.
5130                          *
5131                          * XXXGL: notes on checking listen queue length.
5132                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5133                          *    SOLISTENING(), because a listening "UDP type"
5134                          *    socket isn't listening in terms of the socket
5135                          *    layer.  It is a normal data flow socket, that
5136                          *    can fork off new connections.  Thus, we should
5137                          *    look into sol_qlen only in case we are !UDP.
5138                          * 2) Checking sol_qlen in general requires locking
5139                          *    the socket, and this code lacks that.
5140                          */
5141                         if ((stcb == NULL) &&
5142                             (!SCTP_IS_LISTENING(inp) ||
5143                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5144                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5145                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5146                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5147                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5148                                         sctp_abort_association(inp, stcb, m, iphlen,
5149                                             src, dst, sh, op_err,
5150                                             mflowtype, mflowid,
5151                                             vrf_id, port);
5152                                 }
5153                                 *offset = length;
5154                                 return (NULL);
5155                         } else {
5156                                 struct mbuf *ret_buf;
5157                                 struct sctp_inpcb *linp;
5158
5159                                 if (stcb) {
5160                                         linp = NULL;
5161                                 } else {
5162                                         linp = inp;
5163                                 }
5164
5165                                 if (linp != NULL) {
5166                                         SCTP_ASOC_CREATE_LOCK(linp);
5167                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5168                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5169                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5170                                                 goto abend;
5171                                         }
5172                                 }
5173                                 if (netp != NULL) {
5174                                         struct sctp_tcb *locked_stcb;
5175
5176                                         locked_stcb = stcb;
5177                                         ret_buf =
5178                                             sctp_handle_cookie_echo(m, iphlen,
5179                                             *offset,
5180                                             src, dst,
5181                                             sh,
5182                                             (struct sctp_cookie_echo_chunk *)ch,
5183                                             &inp, &stcb, netp,
5184                                             auth_skipped,
5185                                             auth_offset,
5186                                             auth_len,
5187                                             &locked_stcb,
5188                                             mflowtype,
5189                                             mflowid,
5190                                             vrf_id,
5191                                             port);
5192                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5193                                                 SCTP_TCB_UNLOCK(locked_stcb);
5194                                         }
5195                                         if (stcb != NULL) {
5196                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5197                                         }
5198                                 } else {
5199                                         ret_buf = NULL;
5200                                 }
5201                                 if (linp != NULL) {
5202                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5203                                 }
5204                                 if (ret_buf == NULL) {
5205                                         if (stcb != NULL) {
5206                                                 SCTP_TCB_UNLOCK(stcb);
5207                                         }
5208                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5209                                             "GAK, null buffer\n");
5210                                         *offset = length;
5211                                         return (NULL);
5212                                 }
5213                                 /* if AUTH skipped, see if it verified... */
5214                                 if (auth_skipped) {
5215                                         got_auth = 1;
5216                                         auth_skipped = 0;
5217                                 }
5218                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5219                                         /*
5220                                          * Restart the timer if we have
5221                                          * pending data
5222                                          */
5223                                         struct sctp_tmit_chunk *chk;
5224
5225                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5226                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5227                                 }
5228                         }
5229                         break;
5230                 case SCTP_COOKIE_ACK:
5231                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5232                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5233                                 return (stcb);
5234                         }
5235                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5236                                 /* We are not interested anymore */
5237                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5238                                         ;
5239                                 } else if (stcb) {
5240 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5241                                         so = SCTP_INP_SO(inp);
5242                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5243                                         SCTP_TCB_UNLOCK(stcb);
5244                                         SCTP_SOCKET_LOCK(so, 1);
5245                                         SCTP_TCB_LOCK(stcb);
5246                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5247 #endif
5248                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5249                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5251                                         SCTP_SOCKET_UNLOCK(so, 1);
5252 #endif
5253                                         *offset = length;
5254                                         return (NULL);
5255                                 }
5256                         }
5257                         if ((netp != NULL) && (*netp != NULL)) {
5258                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5259                         }
5260                         break;
5261                 case SCTP_ECN_ECHO:
5262                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5263                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5264                                 /* Its not ours */
5265                                 *offset = length;
5266                                 return (stcb);
5267                         }
5268                         if (stcb->asoc.ecn_supported == 0) {
5269                                 goto unknown_chunk;
5270                         }
5271                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5272                         ecne_seen = 1;
5273                         break;
5274                 case SCTP_ECN_CWR:
5275                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5276                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5277                                 *offset = length;
5278                                 return (stcb);
5279                         }
5280                         if (stcb->asoc.ecn_supported == 0) {
5281                                 goto unknown_chunk;
5282                         }
5283                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5284                         break;
5285                 case SCTP_SHUTDOWN_COMPLETE:
5286                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5287                         /* must be first and only chunk */
5288                         if ((num_chunks > 1) ||
5289                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5290                                 *offset = length;
5291                                 return (stcb);
5292                         }
5293                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5294                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5295                                     stcb, *netp);
5296                         }
5297                         *offset = length;
5298                         return (NULL);
5299                         break;
5300                 case SCTP_ASCONF:
5301                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5302                         if (stcb != NULL) {
5303                                 if (stcb->asoc.asconf_supported == 0) {
5304                                         goto unknown_chunk;
5305                                 }
5306                                 sctp_handle_asconf(m, *offset, src,
5307                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5308                                 asconf_cnt++;
5309                         }
5310                         break;
5311                 case SCTP_ASCONF_ACK:
5312                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5313                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5314                                 /* Its not ours */
5315                                 *offset = length;
5316                                 return (stcb);
5317                         }
5318                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5319                                 if (stcb->asoc.asconf_supported == 0) {
5320                                         goto unknown_chunk;
5321                                 }
5322                                 /* He's alive so give him credit */
5323                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5324                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5325                                             stcb->asoc.overall_error_count,
5326                                             0,
5327                                             SCTP_FROM_SCTP_INPUT,
5328                                             __LINE__);
5329                                 }
5330                                 stcb->asoc.overall_error_count = 0;
5331                                 sctp_handle_asconf_ack(m, *offset,
5332                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5333                                 if (abort_no_unlock)
5334                                         return (NULL);
5335                         }
5336                         break;
5337                 case SCTP_FORWARD_CUM_TSN:
5338                 case SCTP_IFORWARD_CUM_TSN:
5339                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n");
5340                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5341                                 /* Its not ours */
5342                                 *offset = length;
5343                                 return (stcb);
5344                         }
5345                         if (stcb != NULL) {
5346                                 int abort_flag = 0;
5347
5348                                 if (stcb->asoc.prsctp_supported == 0) {
5349                                         goto unknown_chunk;
5350                                 }
5351                                 *fwd_tsn_seen = 1;
5352                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5353                                         /* We are not interested anymore */
5354 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5355                                         so = SCTP_INP_SO(inp);
5356                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5357                                         SCTP_TCB_UNLOCK(stcb);
5358                                         SCTP_SOCKET_LOCK(so, 1);
5359                                         SCTP_TCB_LOCK(stcb);
5360                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5361 #endif
5362                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5363                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5364 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5365                                         SCTP_SOCKET_UNLOCK(so, 1);
5366 #endif
5367                                         *offset = length;
5368                                         return (NULL);
5369                                 }
5370                                 /*
5371                                  * For sending a SACK this looks like DATA
5372                                  * chunks.
5373                                  */
5374                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5375                                 sctp_handle_forward_tsn(stcb,
5376                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5377                                 if (abort_flag) {
5378                                         *offset = length;
5379                                         return (NULL);
5380                                 }
5381                         }
5382                         break;
5383                 case SCTP_STREAM_RESET:
5384                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5385                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5386                                 /* Its not ours */
5387                                 *offset = length;
5388                                 return (stcb);
5389                         }
5390                         if (stcb->asoc.reconfig_supported == 0) {
5391                                 goto unknown_chunk;
5392                         }
5393                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5394                                 /* stop processing */
5395                                 *offset = length;
5396                                 return (NULL);
5397                         }
5398                         break;
5399                 case SCTP_PACKET_DROPPED:
5400                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5401                         /* re-get it all please */
5402                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5403                                 /* Its not ours */
5404                                 *offset = length;
5405                                 return (stcb);
5406                         }
5407                         if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5408                                 if (stcb->asoc.pktdrop_supported == 0) {
5409                                         goto unknown_chunk;
5410                                 }
5411                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5412                                     stcb, *netp,
5413                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5414                         }
5415                         break;
5416                 case SCTP_AUTHENTICATION:
5417                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5418                         if (stcb == NULL) {
5419                                 /* save the first AUTH for later processing */
5420                                 if (auth_skipped == 0) {
5421                                         auth_offset = *offset;
5422                                         auth_len = chk_length;
5423                                         auth_skipped = 1;
5424                                 }
5425                                 /* skip this chunk (temporarily) */
5426                                 goto next_chunk;
5427                         }
5428                         if (stcb->asoc.auth_supported == 0) {
5429                                 goto unknown_chunk;
5430                         }
5431                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5432                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5433                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5434                                 /* Its not ours */
5435                                 *offset = length;
5436                                 return (stcb);
5437                         }
5438                         if (got_auth == 1) {
5439                                 /* skip this chunk... it's already auth'd */
5440                                 goto next_chunk;
5441                         }
5442                         got_auth = 1;
5443                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5444                             m, *offset)) {
5445                                 /* auth HMAC failed so dump the packet */
5446                                 *offset = length;
5447                                 return (stcb);
5448                         } else {
5449                                 /* remaining chunks are HMAC checked */
5450                                 stcb->asoc.authenticated = 1;
5451                         }
5452                         break;
5453
5454                 default:
5455         unknown_chunk:
5456                         /* it's an unknown chunk! */
5457                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5458                                 struct sctp_gen_error_cause *cause;
5459                                 int len;
5460
5461                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5462                                     0, M_NOWAIT, 1, MT_DATA);
5463                                 if (op_err != NULL) {
5464                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5465                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5466                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5467                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5468                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5469                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5470                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5471 #ifdef SCTP_MBUF_LOGGING
5472                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5473                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5474                                                 }
5475 #endif
5476                                                 sctp_queue_op_err(stcb, op_err);
5477                                         } else {
5478                                                 sctp_m_freem(op_err);
5479                                         }
5480                                 }
5481                         }
5482                         if ((ch->chunk_type & 0x80) == 0) {
5483                                 /* discard this packet */
5484                                 *offset = length;
5485                                 return (stcb);
5486                         }       /* else skip this bad chunk and continue... */
5487                         break;
5488                 }               /* switch (ch->chunk_type) */
5489
5490
5491 next_chunk:
5492                 /* get the next chunk */
5493                 *offset += SCTP_SIZE32(chk_length);
5494                 if (*offset >= length) {
5495                         /* no more data left in the mbuf chain */
5496                         break;
5497                 }
5498                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5499                     sizeof(struct sctp_chunkhdr), chunk_buf);
5500                 if (ch == NULL) {
5501                         *offset = length;
5502                         return (stcb);
5503                 }
5504         }                       /* while */
5505
5506         if ((asconf_cnt > 0) && (stcb != NULL)) {
5507                 sctp_send_asconf_ack(stcb);
5508         }
5509         return (stcb);
5510 }
5511
5512
5513 /*
5514  * common input chunk processing (v4 and v6)
5515  */
5516 void
5517 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5518     struct sockaddr *src, struct sockaddr *dst,
5519     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5520 #if !defined(SCTP_WITH_NO_CSUM)
5521     uint8_t compute_crc,
5522 #endif
5523     uint8_t ecn_bits,
5524     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5525     uint32_t vrf_id, uint16_t port)
5526 {
5527         uint32_t high_tsn;
5528         int fwd_tsn_seen = 0, data_processed = 0;
5529         struct mbuf *m = *mm, *op_err;
5530         char msg[SCTP_DIAG_INFO_LEN];
5531         int un_sent;
5532         int cnt_ctrl_ready = 0;
5533         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5534         struct sctp_tcb *stcb = NULL;
5535         struct sctp_nets *net = NULL;
5536
5537         SCTP_STAT_INCR(sctps_recvdatagrams);
5538 #ifdef SCTP_AUDITING_ENABLED
5539         sctp_audit_log(0xE0, 1);
5540         sctp_auditing(0, inp, stcb, net);
5541 #endif
5542 #if !defined(SCTP_WITH_NO_CSUM)
5543         if (compute_crc != 0) {
5544                 uint32_t check, calc_check;
5545
5546                 check = sh->checksum;
5547                 sh->checksum = 0;
5548                 calc_check = sctp_calculate_cksum(m, iphlen);
5549                 sh->checksum = check;
5550                 if (calc_check != check) {
5551                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5552                             calc_check, check, (void *)m, length, iphlen);
5553                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5554                             sh, ch, &inp, &net, vrf_id);
5555 #if defined(INET) || defined(INET6)
5556                         if ((ch->chunk_type != SCTP_INITIATION) &&
5557                             (net != NULL) && (net->port != port)) {
5558                                 if (net->port == 0) {
5559                                         /* UDP encapsulation turned on. */
5560                                         net->mtu -= sizeof(struct udphdr);
5561                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5562                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5563                                         }
5564                                 } else if (port == 0) {
5565                                         /* UDP encapsulation turned off. */
5566                                         net->mtu += sizeof(struct udphdr);
5567                                         /* XXX Update smallest_mtu */
5568                                 }
5569                                 net->port = port;
5570                         }
5571 #endif
5572                         if (net != NULL) {
5573                                 net->flowtype = mflowtype;
5574                                 net->flowid = mflowid;
5575                         }
5576                         if ((inp != NULL) && (stcb != NULL)) {
5577                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5578                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5579                         } else if ((inp != NULL) && (stcb == NULL)) {
5580                                 inp_decr = inp;
5581                         }
5582                         SCTP_STAT_INCR(sctps_badsum);
5583                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5584                         goto out;
5585                 }
5586         }
5587 #endif
5588         /* Destination port of 0 is illegal, based on RFC4960. */
5589         if (sh->dest_port == 0) {
5590                 SCTP_STAT_INCR(sctps_hdrops);
5591                 goto out;
5592         }
5593         stcb = sctp_findassociation_addr(m, offset, src, dst,
5594             sh, ch, &inp, &net, vrf_id);
5595 #if defined(INET) || defined(INET6)
5596         if ((ch->chunk_type != SCTP_INITIATION) &&
5597             (net != NULL) && (net->port != port)) {
5598                 if (net->port == 0) {
5599                         /* UDP encapsulation turned on. */
5600                         net->mtu -= sizeof(struct udphdr);
5601                         if (stcb->asoc.smallest_mtu > net->mtu) {
5602                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5603                         }
5604                 } else if (port == 0) {
5605                         /* UDP encapsulation turned off. */
5606                         net->mtu += sizeof(struct udphdr);
5607                         /* XXX Update smallest_mtu */
5608                 }
5609                 net->port = port;
5610         }
5611 #endif
5612         if (net != NULL) {
5613                 net->flowtype = mflowtype;
5614                 net->flowid = mflowid;
5615         }
5616         if (inp == NULL) {
5617                 SCTP_STAT_INCR(sctps_noport);
5618                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5619                         goto out;
5620                 }
5621                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5622                         sctp_send_shutdown_complete2(src, dst, sh,
5623                             mflowtype, mflowid, fibnum,
5624                             vrf_id, port);
5625                         goto out;
5626                 }
5627                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5628                         goto out;
5629                 }
5630                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5631                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5632                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5633                             (ch->chunk_type != SCTP_INIT))) {
5634                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5635                                     "Out of the blue");
5636                                 sctp_send_abort(m, iphlen, src, dst,
5637                                     sh, 0, op_err,
5638                                     mflowtype, mflowid, fibnum,
5639                                     vrf_id, port);
5640                         }
5641                 }
5642                 goto out;
5643         } else if (stcb == NULL) {
5644                 inp_decr = inp;
5645         }
5646         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5647             (void *)m, iphlen, offset, length, (void *)stcb);
5648         if (stcb) {
5649                 /* always clear this before beginning a packet */
5650                 stcb->asoc.authenticated = 0;
5651                 stcb->asoc.seen_a_sack_this_pkt = 0;
5652                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5653                     (void *)stcb, stcb->asoc.state);
5654
5655                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5656                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5657                         /*-
5658                          * If we hit here, we had a ref count
5659                          * up when the assoc was aborted and the
5660                          * timer is clearing out the assoc, we should
5661                          * NOT respond to any packet.. its OOTB.
5662                          */
5663                         SCTP_TCB_UNLOCK(stcb);
5664                         stcb = NULL;
5665                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5666                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5667                             msg);
5668                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5669                             mflowtype, mflowid, inp->fibnum,
5670                             vrf_id, port);
5671                         goto out;
5672                 }
5673         }
5674         if (IS_SCTP_CONTROL(ch)) {
5675                 /* process the control portion of the SCTP packet */
5676                 /* sa_ignore NO_NULL_CHK */
5677                 stcb = sctp_process_control(m, iphlen, &offset, length,
5678                     src, dst, sh, ch,
5679                     inp, stcb, &net, &fwd_tsn_seen,
5680                     mflowtype, mflowid, fibnum,
5681                     vrf_id, port);
5682                 if (stcb) {
5683                         /*
5684                          * This covers us if the cookie-echo was there and
5685                          * it changes our INP.
5686                          */
5687                         inp = stcb->sctp_ep;
5688 #if defined(INET) || defined(INET6)
5689                         if ((ch->chunk_type != SCTP_INITIATION) &&
5690                             (net != NULL) && (net->port != port)) {
5691                                 if (net->port == 0) {
5692                                         /* UDP encapsulation turned on. */
5693                                         net->mtu -= sizeof(struct udphdr);
5694                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5695                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5696                                         }
5697                                 } else if (port == 0) {
5698                                         /* UDP encapsulation turned off. */
5699                                         net->mtu += sizeof(struct udphdr);
5700                                         /* XXX Update smallest_mtu */
5701                                 }
5702                                 net->port = port;
5703                         }
5704 #endif
5705                 }
5706         } else {
5707                 /*
5708                  * no control chunks, so pre-process DATA chunks (these
5709                  * checks are taken care of by control processing)
5710                  */
5711
5712                 /*
5713                  * if DATA only packet, and auth is required, then punt...
5714                  * can't have authenticated without any AUTH (control)
5715                  * chunks
5716                  */
5717                 if ((stcb != NULL) &&
5718                     (stcb->asoc.auth_supported == 1) &&
5719                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5720                         /* "silently" ignore */
5721                         SCTP_STAT_INCR(sctps_recvauthmissing);
5722                         goto out;
5723                 }
5724                 if (stcb == NULL) {
5725                         /* out of the blue DATA chunk */
5726                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5727                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5728                             msg);
5729                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5730                             mflowtype, mflowid, fibnum,
5731                             vrf_id, port);
5732                         goto out;
5733                 }
5734                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5735                         /* v_tag mismatch! */
5736                         SCTP_STAT_INCR(sctps_badvtag);
5737                         goto out;
5738                 }
5739         }
5740
5741         if (stcb == NULL) {
5742                 /*
5743                  * no valid TCB for this packet, or we found it's a bad
5744                  * packet while processing control, or we're done with this
5745                  * packet (done or skip rest of data), so we drop it...
5746                  */
5747                 goto out;
5748         }
5749         /*
5750          * DATA chunk processing
5751          */
5752         /* plow through the data chunks while length > offset */
5753
5754         /*
5755          * Rest should be DATA only.  Check authentication state if AUTH for
5756          * DATA is required.
5757          */
5758         if ((length > offset) &&
5759             (stcb != NULL) &&
5760             (stcb->asoc.auth_supported == 1) &&
5761             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5762             !stcb->asoc.authenticated) {
5763                 /* "silently" ignore */
5764                 SCTP_STAT_INCR(sctps_recvauthmissing);
5765                 SCTPDBG(SCTP_DEBUG_AUTH1,
5766                     "Data chunk requires AUTH, skipped\n");
5767                 goto trigger_send;
5768         }
5769         if (length > offset) {
5770                 int retval;
5771
5772                 /*
5773                  * First check to make sure our state is correct. We would
5774                  * not get here unless we really did have a tag, so we don't
5775                  * abort if this happens, just dump the chunk silently.
5776                  */
5777                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5778                 case SCTP_STATE_COOKIE_ECHOED:
5779                         /*
5780                          * we consider data with valid tags in this state
5781                          * shows us the cookie-ack was lost. Imply it was
5782                          * there.
5783                          */
5784                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5785                         break;
5786                 case SCTP_STATE_COOKIE_WAIT:
5787                         /*
5788                          * We consider OOTB any data sent during asoc setup.
5789                          */
5790                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5791                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5792                             msg);
5793                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5794                             mflowtype, mflowid, inp->fibnum,
5795                             vrf_id, port);
5796                         goto out;
5797                         /* sa_ignore NOTREACHED */
5798                         break;
5799                 case SCTP_STATE_EMPTY:  /* should not happen */
5800                 case SCTP_STATE_INUSE:  /* should not happen */
5801                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5802                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5803                 default:
5804                         goto out;
5805                         /* sa_ignore NOTREACHED */
5806                         break;
5807                 case SCTP_STATE_OPEN:
5808                 case SCTP_STATE_SHUTDOWN_SENT:
5809                         break;
5810                 }
5811                 /* plow through the data chunks while length > offset */
5812                 retval = sctp_process_data(mm, iphlen, &offset, length,
5813                     inp, stcb, net, &high_tsn);
5814                 if (retval == 2) {
5815                         /*
5816                          * The association aborted, NO UNLOCK needed since
5817                          * the association is destroyed.
5818                          */
5819                         stcb = NULL;
5820                         goto out;
5821                 }
5822                 data_processed = 1;
5823                 /*
5824                  * Anything important needs to have been m_copy'ed in
5825                  * process_data
5826                  */
5827         }
5828         /* take care of ecn */
5829         if ((data_processed == 1) &&
5830             (stcb->asoc.ecn_supported == 1) &&
5831             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5832                 /* Yep, we need to add a ECNE */
5833                 sctp_send_ecn_echo(stcb, net, high_tsn);
5834         }
5835         if ((data_processed == 0) && (fwd_tsn_seen)) {
5836                 int was_a_gap;
5837                 uint32_t highest_tsn;
5838
5839                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5840                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5841                 } else {
5842                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5843                 }
5844                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5845                 stcb->asoc.send_sack = 1;
5846                 sctp_sack_check(stcb, was_a_gap);
5847         } else if (fwd_tsn_seen) {
5848                 stcb->asoc.send_sack = 1;
5849         }
5850         /* trigger send of any chunks in queue... */
5851 trigger_send:
5852 #ifdef SCTP_AUDITING_ENABLED
5853         sctp_audit_log(0xE0, 2);
5854         sctp_auditing(1, inp, stcb, net);
5855 #endif
5856         SCTPDBG(SCTP_DEBUG_INPUT1,
5857             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5858             stcb->asoc.peers_rwnd,
5859             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5860             stcb->asoc.total_flight);
5861         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5862         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5863                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5864         }
5865         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5866             cnt_ctrl_ready ||
5867             stcb->asoc.trigger_reset ||
5868             ((un_sent) &&
5869             (stcb->asoc.peers_rwnd > 0 ||
5870             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5871                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5872                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5873                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5874         }
5875 #ifdef SCTP_AUDITING_ENABLED
5876         sctp_audit_log(0xE0, 3);
5877         sctp_auditing(2, inp, stcb, net);
5878 #endif
5879 out:
5880         if (stcb != NULL) {
5881                 SCTP_TCB_UNLOCK(stcb);
5882         }
5883         if (inp_decr != NULL) {
5884                 /* reduce ref-count */
5885                 SCTP_INP_WLOCK(inp_decr);
5886                 SCTP_INP_DECR_REF(inp_decr);
5887                 SCTP_INP_WUNLOCK(inp_decr);
5888         }
5889         return;
5890 }
5891
5892 #ifdef INET
5893 void
5894 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5895 {
5896         struct mbuf *m;
5897         int iphlen;
5898         uint32_t vrf_id = 0;
5899         uint8_t ecn_bits;
5900         struct sockaddr_in src, dst;
5901         struct ip *ip;
5902         struct sctphdr *sh;
5903         struct sctp_chunkhdr *ch;
5904         int length, offset;
5905 #if !defined(SCTP_WITH_NO_CSUM)
5906         uint8_t compute_crc;
5907 #endif
5908         uint32_t mflowid;
5909         uint8_t mflowtype;
5910         uint16_t fibnum;
5911
5912         iphlen = off;
5913         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5914                 SCTP_RELEASE_PKT(i_pak);
5915                 return;
5916         }
5917         m = SCTP_HEADER_TO_CHAIN(i_pak);
5918 #ifdef SCTP_MBUF_LOGGING
5919         /* Log in any input mbufs */
5920         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5921                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5922         }
5923 #endif
5924 #ifdef SCTP_PACKET_LOGGING
5925         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5926                 sctp_packet_log(m);
5927         }
5928 #endif
5929         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5930             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5931             m->m_pkthdr.len,
5932             if_name(m->m_pkthdr.rcvif),
5933             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5934         mflowid = m->m_pkthdr.flowid;
5935         mflowtype = M_HASHTYPE_GET(m);
5936         fibnum = M_GETFIB(m);
5937         SCTP_STAT_INCR(sctps_recvpackets);
5938         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5939         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5940         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5941         if (SCTP_BUF_LEN(m) < offset) {
5942                 if ((m = m_pullup(m, offset)) == NULL) {
5943                         SCTP_STAT_INCR(sctps_hdrops);
5944                         return;
5945                 }
5946         }
5947         ip = mtod(m, struct ip *);
5948         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5949         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5950         offset -= sizeof(struct sctp_chunkhdr);
5951         memset(&src, 0, sizeof(struct sockaddr_in));
5952         src.sin_family = AF_INET;
5953         src.sin_len = sizeof(struct sockaddr_in);
5954         src.sin_port = sh->src_port;
5955         src.sin_addr = ip->ip_src;
5956         memset(&dst, 0, sizeof(struct sockaddr_in));
5957         dst.sin_family = AF_INET;
5958         dst.sin_len = sizeof(struct sockaddr_in);
5959         dst.sin_port = sh->dest_port;
5960         dst.sin_addr = ip->ip_dst;
5961         length = ntohs(ip->ip_len);
5962         /* Validate mbuf chain length with IP payload length. */
5963         if (SCTP_HEADER_LEN(m) != length) {
5964                 SCTPDBG(SCTP_DEBUG_INPUT1,
5965                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5966                 SCTP_STAT_INCR(sctps_hdrops);
5967                 goto out;
5968         }
5969         /* SCTP does not allow broadcasts or multicasts */
5970         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5971                 goto out;
5972         }
5973         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5974                 goto out;
5975         }
5976         ecn_bits = ip->ip_tos;
5977 #if defined(SCTP_WITH_NO_CSUM)
5978         SCTP_STAT_INCR(sctps_recvnocrc);
5979 #else
5980         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5981                 SCTP_STAT_INCR(sctps_recvhwcrc);
5982                 compute_crc = 0;
5983         } else {
5984                 SCTP_STAT_INCR(sctps_recvswcrc);
5985                 compute_crc = 1;
5986         }
5987 #endif
5988         sctp_common_input_processing(&m, iphlen, offset, length,
5989             (struct sockaddr *)&src,
5990             (struct sockaddr *)&dst,
5991             sh, ch,
5992 #if !defined(SCTP_WITH_NO_CSUM)
5993             compute_crc,
5994 #endif
5995             ecn_bits,
5996             mflowtype, mflowid, fibnum,
5997             vrf_id, port);
5998 out:
5999         if (m) {
6000                 sctp_m_freem(m);
6001         }
6002         return;
6003 }
6004
6005 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6006 extern int *sctp_cpuarry;
6007 #endif
6008
6009 int
6010 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6011 {
6012         struct mbuf *m;
6013         int off;
6014
6015         m = *mp;
6016         off = *offp;
6017 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6018         if (mp_ncpus > 1) {
6019                 struct ip *ip;
6020                 struct sctphdr *sh;
6021                 int offset;
6022                 int cpu_to_use;
6023                 uint32_t flowid, tag;
6024
6025                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6026                         flowid = m->m_pkthdr.flowid;
6027                 } else {
6028                         /*
6029                          * No flow id built by lower layers fix it so we
6030                          * create one.
6031                          */
6032                         offset = off + sizeof(struct sctphdr);
6033                         if (SCTP_BUF_LEN(m) < offset) {
6034                                 if ((m = m_pullup(m, offset)) == NULL) {
6035                                         SCTP_STAT_INCR(sctps_hdrops);
6036                                         return (IPPROTO_DONE);
6037                                 }
6038                         }
6039                         ip = mtod(m, struct ip *);
6040                         sh = (struct sctphdr *)((caddr_t)ip + off);
6041                         tag = htonl(sh->v_tag);
6042                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6043                         m->m_pkthdr.flowid = flowid;
6044                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6045                 }
6046                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6047                 sctp_queue_to_mcore(m, off, cpu_to_use);
6048                 return (IPPROTO_DONE);
6049         }
6050 #endif
6051         sctp_input_with_port(m, off, 0);
6052         return (IPPROTO_DONE);
6053 }
6054 #endif