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, 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         /*
 165          * We are only accepting if we have a socket with positive
 166          * so_qlimit.
 167          */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (inp->sctp_socket == NULL) ||
 172             (inp->sctp_socket->so_qlimit == 0))) {
 173                 /*
 174                  * FIX ME ?? What about TCP model and we have a
 175                  * match/restart case? Actually no fix is needed. the lookup
 176                  * will always find the existing assoc so stcb would not be
 177                  * NULL. It may be questionable to do this since we COULD
 178                  * just send back the INIT-ACK and hope that the app did
 179                  * accept()'s by the time the COOKIE was sent. But there is
 180                  * a price to pay for COOKIE generation and I don't want to
 181                  * pay it on the chance that the app will actually do some
 182                  * accepts(). The App just looses and should NOT be in this
 183                  * state :-)
 184                  */
 185                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 186                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 187                             "No listener");
 188                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 189                             mflowtype, mflowid, inp->fibnum,
 190                             vrf_id, port);
 191                 }
 192                 goto outnow;
 193         }
 194         if ((stcb != NULL) &&
 195             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 197                 sctp_send_shutdown_ack(stcb, NULL);
 198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 199         } else {
 200                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 201                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
 202                     sh, cp,
 203                     mflowtype, mflowid,
 204                     vrf_id, port,
 205                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 206         }
 207 outnow:
 208         if (stcb == NULL) {
 209                 SCTP_INP_RUNLOCK(inp);
 210         }
 211 }
 212
 213 /*
 214  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 215  */
 216
 217 int
 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 220     SCTP_UNUSED
 221 #endif
 222 )
 223 {
 224         int unsent_data = 0;
 225         unsigned int i;
 226         struct sctp_stream_queue_pending *sp;
 227         struct sctp_association *asoc;
 228
 229         /*
 230          * This function returns the number of streams that have true unsent
 231          * data on them. Note that as it looks through it will clean up any
 232          * places that have old data that has been sent but left at top of
 233          * stream queue.
 234          */
 235         asoc = &stcb->asoc;
 236         SCTP_TCB_SEND_LOCK(stcb);
 237         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 238                 /* Check to see if some data queued */
 239                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 240                         /* sa_ignore FREED_MEMORY */
 241                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 242                         if (sp == NULL) {
 243                                 continue;
 244                         }
 245                         if ((sp->msg_is_complete) &&
 246                             (sp->length == 0) &&
 247                             (sp->sender_all_done)) {
 248                                 /*
 249                                  * We are doing differed cleanup. Last time
 250                                  * through when we took all the data the
 251                                  * sender_all_done was not set.
 252                                  */
 253                                 if (sp->put_last_out == 0) {
 254                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 255                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 256                                             sp->sender_all_done,
 257                                             sp->length,
 258                                             sp->msg_is_complete,
 259                                             sp->put_last_out);
 260                                 }
 261                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 262                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 263                                 if (sp->net) {
 264                                         sctp_free_remote_addr(sp->net);
 265                                         sp->net = NULL;
 266                                 }
 267                                 if (sp->data) {
 268                                         sctp_m_freem(sp->data);
 269                                         sp->data = NULL;
 270                                 }
 271                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 272                         } else {
 273                                 unsent_data++;
 274                                 break;
 275                         }
 276                 }
 277         }
 278         SCTP_TCB_SEND_UNLOCK(stcb);
 279         return (unsent_data);
 280 }
 281
 282 static int
 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 284 {
 285         struct sctp_init *init;
 286         struct sctp_association *asoc;
 287         struct sctp_nets *lnet;
 288         unsigned int i;
 289
 290         init = &cp->init;
 291         asoc = &stcb->asoc;
 292         /* save off parameters */
 293         asoc->peer_vtag = ntohl(init->initiate_tag);
 294         asoc->peers_rwnd = ntohl(init->a_rwnd);
 295         /* init tsn's */
 296         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 297
 298         if (!TAILQ_EMPTY(&asoc->nets)) {
 299                 /* update any ssthresh's that may have a default */
 300                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 301                         lnet->ssthresh = asoc->peers_rwnd;
 302                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 303                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 304                         }
 305                 }
 306         }
 307         SCTP_TCB_SEND_LOCK(stcb);
 308         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 309                 unsigned int newcnt;
 310                 struct sctp_stream_out *outs;
 311                 struct sctp_stream_queue_pending *sp, *nsp;
 312                 struct sctp_tmit_chunk *chk, *nchk;
 313
 314                 /* abandon the upper streams */
 315                 newcnt = ntohs(init->num_inbound_streams);
 316                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 317                         if (chk->rec.data.stream_number >= newcnt) {
 318                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 319                                 asoc->send_queue_cnt--;
 320                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 321                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 322 #ifdef INVARIANTS
 323                                 } else {
 324                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
 325 #endif
 326                                 }
 327                                 if (chk->data != NULL) {
 328                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 329                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 330                                             0, chk, SCTP_SO_NOT_LOCKED);
 331                                         if (chk->data) {
 332                                                 sctp_m_freem(chk->data);
 333                                                 chk->data = NULL;
 334                                         }
 335                                 }
 336                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 337                                 /* sa_ignore FREED_MEMORY */
 338                         }
 339                 }
 340                 if (asoc->strmout) {
 341                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 342                                 outs = &asoc->strmout[i];
 343                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 344                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 345                                         asoc->stream_queue_cnt--;
 346                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 347                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 348                                         if (sp->data) {
 349                                                 sctp_m_freem(sp->data);
 350                                                 sp->data = NULL;
 351                                         }
 352                                         if (sp->net) {
 353                                                 sctp_free_remote_addr(sp->net);
 354                                                 sp->net = NULL;
 355                                         }
 356                                         /* Free the chunk */
 357                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 358                                         /* sa_ignore FREED_MEMORY */
 359                                 }
 360                                 outs->state = SCTP_STREAM_CLOSED;
 361                         }
 362                 }
 363                 /* cut back the count */
 364                 asoc->pre_open_streams = newcnt;
 365         }
 366         SCTP_TCB_SEND_UNLOCK(stcb);
 367         asoc->streamoutcnt = asoc->pre_open_streams;
 368         for (i = 0; i < asoc->streamoutcnt; i++) {
 369                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
 370         }
 371         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 372         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 373         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 374                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 375         }
 376         /* This is the next one we expect */
 377         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 378
 379         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 380         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 381
 382         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 383         /* open the requested streams */
 384
 385         if (asoc->strmin != NULL) {
 386                 /* Free the old ones */
 387                 struct sctp_queued_to_read *ctl, *nctl;
 388
 389                 for (i = 0; i < asoc->streamincnt; i++) {
 390                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 391                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 392                                 sctp_free_remote_addr(ctl->whoFrom);
 393                                 ctl->whoFrom = NULL;
 394                                 sctp_m_freem(ctl->data);
 395                                 ctl->data = NULL;
 396                                 sctp_free_a_readq(stcb, ctl);
 397                         }
 398                 }
 399                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 400         }
 401         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 402                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 403         } else {
 404                 asoc->streamincnt = asoc->max_inbound_streams;
 405         }
 406         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 407             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 408         if (asoc->strmin == NULL) {
 409                 /* we didn't get memory for the streams! */
 410                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 411                 return (-1);
 412         }
 413         for (i = 0; i < asoc->streamincnt; i++) {
 414                 asoc->strmin[i].stream_no = i;
 415                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 416                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 417                 asoc->strmin[i].delivery_started = 0;
 418         }
 419         /*
 420          * load_address_from_init will put the addresses into the
 421          * association when the COOKIE is processed or the INIT-ACK is
 422          * processed. Both types of COOKIE's existing and new call this
 423          * routine. It will remove addresses that are no longer in the
 424          * association (for the restarting case where addresses are
 425          * removed). Up front when the INIT arrives we will discard it if it
 426          * is a restart and new addresses have been added.
 427          */
 428         /* sa_ignore MEMLEAK */
 429         return (0);
 430 }
 431
 432 /*
 433  * INIT-ACK message processing/consumption returns value < 0 on error
 434  */
 435 static int
 436 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 437     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 438     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 439     struct sctp_nets *net, int *abort_no_unlock,
 440     uint8_t mflowtype, uint32_t mflowid,
 441     uint32_t vrf_id)
 442 {
 443         struct sctp_association *asoc;
 444         struct mbuf *op_err;
 445         int retval, abort_flag;
 446         uint32_t initack_limit;
 447         int nat_friendly = 0;
 448
 449         /* First verify that we have no illegal param's */
 450         abort_flag = 0;
 451
 452         op_err = sctp_arethere_unrecognized_parameters(m,
 453             (offset + sizeof(struct sctp_init_chunk)),
 454             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 455         if (abort_flag) {
 456                 /* Send an abort and notify peer */
 457                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 458                 *abort_no_unlock = 1;
 459                 return (-1);
 460         }
 461         asoc = &stcb->asoc;
 462         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 463         /* process the peer's parameters in the INIT-ACK */
 464         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 465         if (retval < 0) {
 466                 return (retval);
 467         }
 468         initack_limit = offset + ntohs(cp->ch.chunk_length);
 469         /* load all addresses */
 470         if ((retval = sctp_load_addresses_from_init(stcb, m,
 471             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 472             src, dst, NULL))) {
 473                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 474                     "Problem with address parameters");
 475                 SCTPDBG(SCTP_DEBUG_INPUT1,
 476                     "Load addresses from INIT causes an abort %d\n",
 477                     retval);
 478                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 479                     src, dst, sh, op_err,
 480                     mflowtype, mflowid,
 481                     vrf_id, net->port);
 482                 *abort_no_unlock = 1;
 483                 return (-1);
 484         }
 485         /* if the peer doesn't support asconf, flush the asconf queue */
 486         if (asoc->asconf_supported == 0) {
 487                 struct sctp_asconf_addr *param, *nparam;
 488
 489                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 490                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 491                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 492                 }
 493         }
 494         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 495             stcb->asoc.local_hmacs);
 496         if (op_err) {
 497                 sctp_queue_op_err(stcb, op_err);
 498                 /* queuing will steal away the mbuf chain to the out queue */
 499                 op_err = NULL;
 500         }
 501         /* extract the cookie and queue it to "echo" it back... */
 502         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 503                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 504                     stcb->asoc.overall_error_count,
 505                     0,
 506                     SCTP_FROM_SCTP_INPUT,
 507                     __LINE__);
 508         }
 509         stcb->asoc.overall_error_count = 0;
 510         net->error_count = 0;
 511
 512         /*
 513          * Cancel the INIT timer, We do this first before queueing the
 514          * cookie. We always cancel at the primary to assue that we are
 515          * canceling the timer started by the INIT which always goes to the
 516          * primary.
 517          */
 518         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 519             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 520
 521         /* calculate the RTO */
 522         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 523             SCTP_RTT_FROM_NON_DATA);
 524         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 525         if (retval < 0) {
 526                 /*
 527                  * No cookie, we probably should send a op error. But in any
 528                  * case if there is no cookie in the INIT-ACK, we can
 529                  * abandon the peer, its broke.
 530                  */
 531                 if (retval == -3) {
 532                         uint16_t len;
 533
 534                         len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 535                         /* We abort with an error of missing mandatory param */
 536                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 537                         if (op_err != NULL) {
 538                                 struct sctp_error_missing_param *cause;
 539
 540                                 SCTP_BUF_LEN(op_err) = len;
 541                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 542                                 /* Subtract the reserved param */
 543                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 544                                 cause->cause.length = htons(len);
 545                                 cause->num_missing_params = htonl(1);
 546                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 547                         }
 548                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 549                             src, dst, sh, op_err,
 550                             mflowtype, mflowid,
 551                             vrf_id, net->port);
 552                         *abort_no_unlock = 1;
 553                 }
 554                 return (retval);
 555         }
 556         return (0);
 557 }
 558
 559 static void
 560 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 561     struct sctp_tcb *stcb, struct sctp_nets *net)
 562 {
 563         union sctp_sockstore store;
 564         struct sctp_nets *r_net, *f_net;
 565         struct timeval tv;
 566         int req_prim = 0;
 567         uint16_t old_error_counter;
 568
 569         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 570                 /* Invalid length */
 571                 return;
 572         }
 573         memset(&store, 0, sizeof(store));
 574         switch (cp->heartbeat.hb_info.addr_family) {
 575 #ifdef INET
 576         case AF_INET:
 577                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 578                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 579                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 580                         store.sin.sin_port = stcb->rport;
 581                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 582                             sizeof(store.sin.sin_addr));
 583                 } else {
 584                         return;
 585                 }
 586                 break;
 587 #endif
 588 #ifdef INET6
 589         case AF_INET6:
 590                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 591                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 592                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 593                         store.sin6.sin6_port = stcb->rport;
 594                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 595                 } else {
 596                         return;
 597                 }
 598                 break;
 599 #endif
 600         default:
 601                 return;
 602         }
 603         r_net = sctp_findnet(stcb, &store.sa);
 604         if (r_net == NULL) {
 605                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 606                 return;
 607         }
 608         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 609             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 610             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 611                 /*
 612                  * If the its a HB and it's random value is correct when can
 613                  * confirm the destination.
 614                  */
 615                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 616                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 617                         stcb->asoc.primary_destination = r_net;
 618                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 619                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 620                         if (f_net != r_net) {
 621                                 /*
 622                                  * first one on the list is NOT the primary
 623                                  * sctp_cmpaddr() is much more efficent if
 624                                  * the primary is the first on the list,
 625                                  * make it so.
 626                                  */
 627                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 628                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 629                         }
 630                         req_prim = 1;
 631                 }
 632                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 633                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 634                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 635                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 636                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 637         }
 638         old_error_counter = r_net->error_count;
 639         r_net->error_count = 0;
 640         r_net->hb_responded = 1;
 641         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 642         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 643         /* Now lets do a RTO with this */
 644         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 645             SCTP_RTT_FROM_NON_DATA);
 646         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 647                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 648                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 649                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 650         }
 651         if (r_net->dest_state & SCTP_ADDR_PF) {
 652                 r_net->dest_state &= ~SCTP_ADDR_PF;
 653                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 654         }
 655         if (old_error_counter > 0) {
 656                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 657                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 658                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 659         }
 660         if (r_net == stcb->asoc.primary_destination) {
 661                 if (stcb->asoc.alternate) {
 662                         /* release the alternate, primary is good */
 663                         sctp_free_remote_addr(stcb->asoc.alternate);
 664                         stcb->asoc.alternate = NULL;
 665                 }
 666         }
 667         /* Mobility adaptation */
 668         if (req_prim) {
 669                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 670                     SCTP_MOBILITY_BASE) ||
 671                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 672                     SCTP_MOBILITY_FASTHANDOFF)) &&
 673                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 674                     SCTP_MOBILITY_PRIM_DELETED)) {
 675
 676                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 677                             stcb->sctp_ep, stcb, NULL,
 678                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 679                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 680                             SCTP_MOBILITY_FASTHANDOFF)) {
 681                                 sctp_assoc_immediate_retrans(stcb,
 682                                     stcb->asoc.primary_destination);
 683                         }
 684                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 685                             SCTP_MOBILITY_BASE)) {
 686                                 sctp_move_chunks_from_net(stcb,
 687                                     stcb->asoc.deleted_primary);
 688                         }
 689                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 690                             stcb->asoc.deleted_primary);
 691                 }
 692         }
 693 }
 694
 695 static int
 696 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 697 {
 698         /*
 699          * return 0 means we want you to proceed with the abort non-zero
 700          * means no abort processing
 701          */
 702         struct sctpasochead *head;
 703
 704         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 705                 /* generate a new vtag and send init */
 706                 LIST_REMOVE(stcb, sctp_asocs);
 707                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 708                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 709                 /*
 710                  * put it in the bucket in the vtag hash of assoc's for the
 711                  * system
 712                  */
 713                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 714                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 715                 return (1);
 716         }
 717         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 718                 /*
 719                  * treat like a case where the cookie expired i.e.: - dump
 720                  * current cookie. - generate a new vtag. - resend init.
 721                  */
 722                 /* generate a new vtag and send init */
 723                 LIST_REMOVE(stcb, sctp_asocs);
 724                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 725                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 726                 sctp_stop_all_cookie_timers(stcb);
 727                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 728                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 729                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 730                 /*
 731                  * put it in the bucket in the vtag hash of assoc's for the
 732                  * system
 733                  */
 734                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 735                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 736                 return (1);
 737         }
 738         return (0);
 739 }
 740
 741 static int
 742 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 743     struct sctp_nets *net)
 744 {
 745         /*
 746          * return 0 means we want you to proceed with the abort non-zero
 747          * means no abort processing
 748          */
 749         if (stcb->asoc.auth_supported == 0) {
 750                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 751                 return (0);
 752         }
 753         sctp_asconf_send_nat_state_update(stcb, net);
 754         return (1);
 755 }
 756
 757
 758 static void
 759 sctp_handle_abort(struct sctp_abort_chunk *abort,
 760     struct sctp_tcb *stcb, struct sctp_nets *net)
 761 {
 762 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 763         struct socket *so;
 764
 765 #endif
 766         uint16_t len;
 767         uint16_t error;
 768
 769         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 770         if (stcb == NULL)
 771                 return;
 772
 773         len = ntohs(abort->ch.chunk_length);
 774         if (len > sizeof(struct sctp_chunkhdr)) {
 775                 /*
 776                  * Need to check the cause codes for our two magic nat
 777                  * aborts which don't kill the assoc necessarily.
 778                  */
 779                 struct sctp_gen_error_cause *cause;
 780
 781                 cause = (struct sctp_gen_error_cause *)(abort + 1);
 782                 error = ntohs(cause->code);
 783                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 784                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 785                             abort->ch.chunk_flags);
 786                         if (sctp_handle_nat_colliding_state(stcb)) {
 787                                 return;
 788                         }
 789                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 790                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 791                             abort->ch.chunk_flags);
 792                         if (sctp_handle_nat_missing_state(stcb, net)) {
 793                                 return;
 794                         }
 795                 }
 796         } else {
 797                 error = 0;
 798         }
 799         /* stop any receive timers */
 800         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 801             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 802         /* notify user of the abort and clean up... */
 803         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 804         /* free the tcb */
 805         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 806         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 807             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 808                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 809         }
 810 #ifdef SCTP_ASOCLOG_OF_TSNS
 811         sctp_print_out_track_log(stcb);
 812 #endif
 813 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 814         so = SCTP_INP_SO(stcb->sctp_ep);
 815         atomic_add_int(&stcb->asoc.refcnt, 1);
 816         SCTP_TCB_UNLOCK(stcb);
 817         SCTP_SOCKET_LOCK(so, 1);
 818         SCTP_TCB_LOCK(stcb);
 819         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 820 #endif
 821         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 822         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 823             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 824 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 825         SCTP_SOCKET_UNLOCK(so, 1);
 826 #endif
 827         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 828 }
 829
 830 static void
 831 sctp_start_net_timers(struct sctp_tcb *stcb)
 832 {
 833         uint32_t cnt_hb_sent;
 834         struct sctp_nets *net;
 835
 836         cnt_hb_sent = 0;
 837         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 838                 /*
 839                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 840                  * If the dest in unconfirmed send a hb as well if under
 841                  * max_hb_burst have been sent.
 842                  */
 843                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 844                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 845                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 846                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 847                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 848                         cnt_hb_sent++;
 849                 }
 850         }
 851         if (cnt_hb_sent) {
 852                 sctp_chunk_output(stcb->sctp_ep, stcb,
 853                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 854                     SCTP_SO_NOT_LOCKED);
 855         }
 856 }
 857
 858
 859 static void
 860 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 861     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 862 {
 863         struct sctp_association *asoc;
 864         int some_on_streamwheel;
 865         int old_state;
 866
 867 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 868         struct socket *so;
 869
 870 #endif
 871
 872         SCTPDBG(SCTP_DEBUG_INPUT2,
 873             "sctp_handle_shutdown: handling SHUTDOWN\n");
 874         if (stcb == NULL)
 875                 return;
 876         asoc = &stcb->asoc;
 877         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 878             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 879                 return;
 880         }
 881         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 882                 /* Shutdown NOT the expected size */
 883                 return;
 884         }
 885         old_state = SCTP_GET_STATE(asoc);
 886         sctp_update_acked(stcb, cp, abort_flag);
 887         if (*abort_flag) {
 888                 return;
 889         }
 890         if (asoc->control_pdapi) {
 891                 /*
 892                  * With a normal shutdown we assume the end of last record.
 893                  */
 894                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 895                 asoc->control_pdapi->end_added = 1;
 896                 asoc->control_pdapi->pdapi_aborted = 1;
 897                 asoc->control_pdapi = NULL;
 898                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 899 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 900                 so = SCTP_INP_SO(stcb->sctp_ep);
 901                 atomic_add_int(&stcb->asoc.refcnt, 1);
 902                 SCTP_TCB_UNLOCK(stcb);
 903                 SCTP_SOCKET_LOCK(so, 1);
 904                 SCTP_TCB_LOCK(stcb);
 905                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 906                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 907                         /* assoc was freed while we were unlocked */
 908                         SCTP_SOCKET_UNLOCK(so, 1);
 909                         return;
 910                 }
 911 #endif
 912                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 914                 SCTP_SOCKET_UNLOCK(so, 1);
 915 #endif
 916         }
 917         /* goto SHUTDOWN_RECEIVED state to block new requests */
 918         if (stcb->sctp_socket) {
 919                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 920                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 921                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 922                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 923                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 924                         /*
 925                          * notify upper layer that peer has initiated a
 926                          * shutdown
 927                          */
 928                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 929
 930                         /* reset time */
 931                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 932                 }
 933         }
 934         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 935                 /*
 936                  * stop the shutdown timer, since we WILL move to
 937                  * SHUTDOWN-ACK-SENT.
 938                  */
 939                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 940                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 941         }
 942         /* Now is there unsent data on a stream somewhere? */
 943         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 944
 945         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 946             !TAILQ_EMPTY(&asoc->sent_queue) ||
 947             some_on_streamwheel) {
 948                 /* By returning we will push more data out */
 949                 return;
 950         } else {
 951                 /* no outstanding data to send, so move on... */
 952                 /* send SHUTDOWN-ACK */
 953                 /* move to SHUTDOWN-ACK-SENT state */
 954                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 955                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 956                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 957                 }
 958                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 959                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 960                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 961                         sctp_stop_timers_for_shutdown(stcb);
 962                         sctp_send_shutdown_ack(stcb, net);
 963                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 964                             stcb->sctp_ep, stcb, net);
 965                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 966                         sctp_send_shutdown_ack(stcb, net);
 967                 }
 968         }
 969 }
 970
 971 static void
 972 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 973     struct sctp_tcb *stcb,
 974     struct sctp_nets *net)
 975 {
 976         struct sctp_association *asoc;
 977
 978 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 979         struct socket *so;
 980
 981         so = SCTP_INP_SO(stcb->sctp_ep);
 982 #endif
 983         SCTPDBG(SCTP_DEBUG_INPUT2,
 984             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 985         if (stcb == NULL)
 986                 return;
 987
 988         asoc = &stcb->asoc;
 989         /* process according to association state */
 990         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 991             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 992                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 993                 sctp_send_shutdown_complete(stcb, net, 1);
 994                 SCTP_TCB_UNLOCK(stcb);
 995                 return;
 996         }
 997         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 998             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 999                 /* unexpected SHUTDOWN-ACK... so ignore... */
1000                 SCTP_TCB_UNLOCK(stcb);
1001                 return;
1002         }
1003         if (asoc->control_pdapi) {
1004                 /*
1005                  * With a normal shutdown we assume the end of last record.
1006                  */
1007                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1008                 asoc->control_pdapi->end_added = 1;
1009                 asoc->control_pdapi->pdapi_aborted = 1;
1010                 asoc->control_pdapi = NULL;
1011                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1013                 atomic_add_int(&stcb->asoc.refcnt, 1);
1014                 SCTP_TCB_UNLOCK(stcb);
1015                 SCTP_SOCKET_LOCK(so, 1);
1016                 SCTP_TCB_LOCK(stcb);
1017                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1018                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1019                         /* assoc was freed while we were unlocked */
1020                         SCTP_SOCKET_UNLOCK(so, 1);
1021                         return;
1022                 }
1023 #endif
1024                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1026                 SCTP_SOCKET_UNLOCK(so, 1);
1027 #endif
1028         }
1029 #ifdef INVARIANTS
1030         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1031             !TAILQ_EMPTY(&asoc->sent_queue) ||
1032             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1033                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1034         }
1035 #endif
1036         /* stop the timer */
1037         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1038             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1039         /* send SHUTDOWN-COMPLETE */
1040         sctp_send_shutdown_complete(stcb, net, 0);
1041         /* notify upper layer protocol */
1042         if (stcb->sctp_socket) {
1043                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1044                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1045                         stcb->sctp_socket->so_snd.sb_cc = 0;
1046                 }
1047                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1048         }
1049         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1050         /* free the TCB but first save off the ep */
1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1052         atomic_add_int(&stcb->asoc.refcnt, 1);
1053         SCTP_TCB_UNLOCK(stcb);
1054         SCTP_SOCKET_LOCK(so, 1);
1055         SCTP_TCB_LOCK(stcb);
1056         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1057 #endif
1058         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1059             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1060 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1061         SCTP_SOCKET_UNLOCK(so, 1);
1062 #endif
1063 }
1064
1065 /*
1066  * Skip past the param header and then we will find the chunk that caused the
1067  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1068  * our peer must be broken.
1069  */
1070 static void
1071 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1072     struct sctp_nets *net)
1073 {
1074         struct sctp_chunkhdr *chk;
1075
1076         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1077         switch (chk->chunk_type) {
1078         case SCTP_ASCONF_ACK:
1079         case SCTP_ASCONF:
1080                 sctp_asconf_cleanup(stcb, net);
1081                 break;
1082         case SCTP_FORWARD_CUM_TSN:
1083                 stcb->asoc.prsctp_supported = 0;
1084                 break;
1085         default:
1086                 SCTPDBG(SCTP_DEBUG_INPUT2,
1087                     "Peer does not support chunk type %d(%x)??\n",
1088                     chk->chunk_type, (uint32_t) chk->chunk_type);
1089                 break;
1090         }
1091 }
1092
1093 /*
1094  * Skip past the param header and then we will find the param that caused the
1095  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1096  * these will turn of specific features.
1097  * XXX: Is this the right thing to do?
1098  */
1099 static void
1100 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1101 {
1102         struct sctp_paramhdr *pbad;
1103
1104         pbad = phdr + 1;
1105         switch (ntohs(pbad->param_type)) {
1106                 /* pr-sctp draft */
1107         case SCTP_PRSCTP_SUPPORTED:
1108                 stcb->asoc.prsctp_supported = 0;
1109                 break;
1110         case SCTP_SUPPORTED_CHUNK_EXT:
1111                 break;
1112                 /* draft-ietf-tsvwg-addip-sctp */
1113         case SCTP_HAS_NAT_SUPPORT:
1114                 stcb->asoc.peer_supports_nat = 0;
1115                 break;
1116         case SCTP_ADD_IP_ADDRESS:
1117         case SCTP_DEL_IP_ADDRESS:
1118         case SCTP_SET_PRIM_ADDR:
1119                 stcb->asoc.asconf_supported = 0;
1120                 break;
1121         case SCTP_SUCCESS_REPORT:
1122         case SCTP_ERROR_CAUSE_IND:
1123                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1124                 SCTPDBG(SCTP_DEBUG_INPUT2,
1125                     "Turning off ASCONF to this strange peer\n");
1126                 stcb->asoc.asconf_supported = 0;
1127                 break;
1128         default:
1129                 SCTPDBG(SCTP_DEBUG_INPUT2,
1130                     "Peer does not support param type %d(%x)??\n",
1131                     pbad->param_type, (uint32_t) pbad->param_type);
1132                 break;
1133         }
1134 }
1135
1136 static int
1137 sctp_handle_error(struct sctp_chunkhdr *ch,
1138     struct sctp_tcb *stcb, struct sctp_nets *net)
1139 {
1140         int chklen;
1141         struct sctp_paramhdr *phdr;
1142         uint16_t error, error_type;
1143         uint16_t error_len;
1144         struct sctp_association *asoc;
1145         int adjust;
1146
1147 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1148         struct socket *so;
1149
1150 #endif
1151
1152         /* parse through all of the errors and process */
1153         asoc = &stcb->asoc;
1154         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1155             sizeof(struct sctp_chunkhdr));
1156         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1157         error = 0;
1158         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1159                 /* Process an Error Cause */
1160                 error_type = ntohs(phdr->param_type);
1161                 error_len = ntohs(phdr->param_length);
1162                 if ((error_len > chklen) || (error_len == 0)) {
1163                         /* invalid param length for this param */
1164                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1165                             chklen, error_len);
1166                         return (0);
1167                 }
1168                 if (error == 0) {
1169                         /* report the first error cause */
1170                         error = error_type;
1171                 }
1172                 switch (error_type) {
1173                 case SCTP_CAUSE_INVALID_STREAM:
1174                 case SCTP_CAUSE_MISSING_PARAM:
1175                 case SCTP_CAUSE_INVALID_PARAM:
1176                 case SCTP_CAUSE_NO_USER_DATA:
1177                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1178                             error_type);
1179                         break;
1180                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1181                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1182                             ch->chunk_flags);
1183                         if (sctp_handle_nat_colliding_state(stcb)) {
1184                                 return (0);
1185                         }
1186                         break;
1187                 case SCTP_CAUSE_NAT_MISSING_STATE:
1188                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1189                             ch->chunk_flags);
1190                         if (sctp_handle_nat_missing_state(stcb, net)) {
1191                                 return (0);
1192                         }
1193                         break;
1194                 case SCTP_CAUSE_STALE_COOKIE:
1195                         /*
1196                          * We only act if we have echoed a cookie and are
1197                          * waiting.
1198                          */
1199                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1200                                 int *p;
1201
1202                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1203                                 /* Save the time doubled */
1204                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1205                                 asoc->stale_cookie_count++;
1206                                 if (asoc->stale_cookie_count >
1207                                     asoc->max_init_times) {
1208                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1209                                         /* now free the asoc */
1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1211                                         so = SCTP_INP_SO(stcb->sctp_ep);
1212                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1213                                         SCTP_TCB_UNLOCK(stcb);
1214                                         SCTP_SOCKET_LOCK(so, 1);
1215                                         SCTP_TCB_LOCK(stcb);
1216                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1217 #endif
1218                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1219                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1220 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1221                                         SCTP_SOCKET_UNLOCK(so, 1);
1222 #endif
1223                                         return (-1);
1224                                 }
1225                                 /* blast back to INIT state */
1226                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1227                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1228                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1229                                 sctp_stop_all_cookie_timers(stcb);
1230                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1231                         }
1232                         break;
1233                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1234                         /*
1235                          * Nothing we can do here, we don't do hostname
1236                          * addresses so if the peer does not like my IPv6
1237                          * (or IPv4 for that matter) it does not matter. If
1238                          * they don't support that type of address, they can
1239                          * NOT possibly get that packet type... i.e. with no
1240                          * IPv6 you can't recieve a IPv6 packet. so we can
1241                          * safely ignore this one. If we ever added support
1242                          * for HOSTNAME Addresses, then we would need to do
1243                          * something here.
1244                          */
1245                         break;
1246                 case SCTP_CAUSE_UNRECOG_CHUNK:
1247                         sctp_process_unrecog_chunk(stcb, phdr, net);
1248                         break;
1249                 case SCTP_CAUSE_UNRECOG_PARAM:
1250                         sctp_process_unrecog_param(stcb, phdr);
1251                         break;
1252                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1253                         /*
1254                          * We ignore this since the timer will drive out a
1255                          * new cookie anyway and there timer will drive us
1256                          * to send a SHUTDOWN_COMPLETE. We can't send one
1257                          * here since we don't have their tag.
1258                          */
1259                         break;
1260                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1261                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1262                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1263                         /*
1264                          * We should NOT get these here, but in a
1265                          * ASCONF-ACK.
1266                          */
1267                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1268                             error_type);
1269                         break;
1270                 case SCTP_CAUSE_OUT_OF_RESC:
1271                         /*
1272                          * And what, pray tell do we do with the fact that
1273                          * the peer is out of resources? Not really sure we
1274                          * could do anything but abort. I suspect this
1275                          * should have came WITH an abort instead of in a
1276                          * OP-ERROR.
1277                          */
1278                         break;
1279                 default:
1280                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1281                             error_type);
1282                         break;
1283                 }
1284                 adjust = SCTP_SIZE32(error_len);
1285                 chklen -= adjust;
1286                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1287         }
1288         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1289         return (0);
1290 }
1291
1292 static int
1293 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1294     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1295     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1296     struct sctp_nets *net, int *abort_no_unlock,
1297     uint8_t mflowtype, uint32_t mflowid,
1298     uint32_t vrf_id)
1299 {
1300         struct sctp_init_ack *init_ack;
1301         struct mbuf *op_err;
1302
1303         SCTPDBG(SCTP_DEBUG_INPUT2,
1304             "sctp_handle_init_ack: handling INIT-ACK\n");
1305
1306         if (stcb == NULL) {
1307                 SCTPDBG(SCTP_DEBUG_INPUT2,
1308                     "sctp_handle_init_ack: TCB is null\n");
1309                 return (-1);
1310         }
1311         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1312                 /* Invalid length */
1313                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1314                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1315                     src, dst, sh, op_err,
1316                     mflowtype, mflowid,
1317                     vrf_id, net->port);
1318                 *abort_no_unlock = 1;
1319                 return (-1);
1320         }
1321         init_ack = &cp->init;
1322         /* validate parameters */
1323         if (init_ack->initiate_tag == 0) {
1324                 /* protocol error... send an abort */
1325                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1326                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1327                     src, dst, sh, op_err,
1328                     mflowtype, mflowid,
1329                     vrf_id, net->port);
1330                 *abort_no_unlock = 1;
1331                 return (-1);
1332         }
1333         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1334                 /* protocol error... send an abort */
1335                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1336                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1337                     src, dst, sh, op_err,
1338                     mflowtype, mflowid,
1339                     vrf_id, net->port);
1340                 *abort_no_unlock = 1;
1341                 return (-1);
1342         }
1343         if (init_ack->num_inbound_streams == 0) {
1344                 /* protocol error... send an abort */
1345                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1346                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1347                     src, dst, sh, op_err,
1348                     mflowtype, mflowid,
1349                     vrf_id, net->port);
1350                 *abort_no_unlock = 1;
1351                 return (-1);
1352         }
1353         if (init_ack->num_outbound_streams == 0) {
1354                 /* protocol error... send an abort */
1355                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1356                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1357                     src, dst, sh, op_err,
1358                     mflowtype, mflowid,
1359                     vrf_id, net->port);
1360                 *abort_no_unlock = 1;
1361                 return (-1);
1362         }
1363         /* process according to association state... */
1364         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1365         case SCTP_STATE_COOKIE_WAIT:
1366                 /* this is the expected state for this chunk */
1367                 /* process the INIT-ACK parameters */
1368                 if (stcb->asoc.primary_destination->dest_state &
1369                     SCTP_ADDR_UNCONFIRMED) {
1370                         /*
1371                          * The primary is where we sent the INIT, we can
1372                          * always consider it confirmed when the INIT-ACK is
1373                          * returned. Do this before we load addresses
1374                          * though.
1375                          */
1376                         stcb->asoc.primary_destination->dest_state &=
1377                             ~SCTP_ADDR_UNCONFIRMED;
1378                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1379                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1380                 }
1381                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1382                     net, abort_no_unlock,
1383                     mflowtype, mflowid,
1384                     vrf_id) < 0) {
1385                         /* error in parsing parameters */
1386                         return (-1);
1387                 }
1388                 /* update our state */
1389                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1390                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1391
1392                 /* reset the RTO calc */
1393                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1394                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1395                             stcb->asoc.overall_error_count,
1396                             0,
1397                             SCTP_FROM_SCTP_INPUT,
1398                             __LINE__);
1399                 }
1400                 stcb->asoc.overall_error_count = 0;
1401                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1402                 /*
1403                  * collapse the init timer back in case of a exponential
1404                  * backoff
1405                  */
1406                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1407                     stcb, net);
1408                 /*
1409                  * the send at the end of the inbound data processing will
1410                  * cause the cookie to be sent
1411                  */
1412                 break;
1413         case SCTP_STATE_SHUTDOWN_SENT:
1414                 /* incorrect state... discard */
1415                 break;
1416         case SCTP_STATE_COOKIE_ECHOED:
1417                 /* incorrect state... discard */
1418                 break;
1419         case SCTP_STATE_OPEN:
1420                 /* incorrect state... discard */
1421                 break;
1422         case SCTP_STATE_EMPTY:
1423         case SCTP_STATE_INUSE:
1424         default:
1425                 /* incorrect state... discard */
1426                 return (-1);
1427                 break;
1428         }
1429         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1430         return (0);
1431 }
1432
1433 static struct sctp_tcb *
1434 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1435     struct sockaddr *src, struct sockaddr *dst,
1436     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1437     struct sctp_inpcb *inp, struct sctp_nets **netp,
1438     struct sockaddr *init_src, int *notification,
1439     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1440     uint8_t mflowtype, uint32_t mflowid,
1441     uint32_t vrf_id, uint16_t port);
1442
1443
1444 /*
1445  * handle a state cookie for an existing association m: input packet mbuf
1446  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1447  * "split" mbuf and the cookie signature does not exist offset: offset into
1448  * mbuf to the cookie-echo chunk
1449  */
1450 static struct sctp_tcb *
1451 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1452     struct sockaddr *src, struct sockaddr *dst,
1453     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1454     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1455     struct sockaddr *init_src, int *notification,
1456     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1457     uint8_t mflowtype, uint32_t mflowid,
1458     uint32_t vrf_id, uint16_t port)
1459 {
1460         struct sctp_association *asoc;
1461         struct sctp_init_chunk *init_cp, init_buf;
1462         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1463         struct sctp_nets *net;
1464         struct mbuf *op_err;
1465         int init_offset, initack_offset, i;
1466         int retval;
1467         int spec_flag = 0;
1468         uint32_t how_indx;
1469
1470 #if defined(SCTP_DETAILED_STR_STATS)
1471         int j;
1472
1473 #endif
1474
1475         net = *netp;
1476         /* I know that the TCB is non-NULL from the caller */
1477         asoc = &stcb->asoc;
1478         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1479                 if (asoc->cookie_how[how_indx] == 0)
1480                         break;
1481         }
1482         if (how_indx < sizeof(asoc->cookie_how)) {
1483                 asoc->cookie_how[how_indx] = 1;
1484         }
1485         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1486                 /* SHUTDOWN came in after sending INIT-ACK */
1487                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1488                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1489                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1490                     mflowtype, mflowid, inp->fibnum,
1491                     vrf_id, net->port);
1492                 if (how_indx < sizeof(asoc->cookie_how))
1493                         asoc->cookie_how[how_indx] = 2;
1494                 return (NULL);
1495         }
1496         /*
1497          * find and validate the INIT chunk in the cookie (peer's info) the
1498          * INIT should start after the cookie-echo header struct (chunk
1499          * header, state cookie header struct)
1500          */
1501         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1502
1503         init_cp = (struct sctp_init_chunk *)
1504             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1505             (uint8_t *) & init_buf);
1506         if (init_cp == NULL) {
1507                 /* could not pull a INIT chunk in cookie */
1508                 return (NULL);
1509         }
1510         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1511                 return (NULL);
1512         }
1513         /*
1514          * find and validate the INIT-ACK chunk in the cookie (my info) the
1515          * INIT-ACK follows the INIT chunk
1516          */
1517         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1518         initack_cp = (struct sctp_init_ack_chunk *)
1519             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1520             (uint8_t *) & initack_buf);
1521         if (initack_cp == NULL) {
1522                 /* could not pull INIT-ACK chunk in cookie */
1523                 return (NULL);
1524         }
1525         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1526                 return (NULL);
1527         }
1528         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1529             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1530                 /*
1531                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1532                  * to get into the OPEN state
1533                  */
1534                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1535                         /*-
1536                          * Opps, this means that we somehow generated two vtag's
1537                          * the same. I.e. we did:
1538                          *  Us               Peer
1539                          *   <---INIT(tag=a)------
1540                          *   ----INIT-ACK(tag=t)-->
1541                          *   ----INIT(tag=t)------> *1
1542                          *   <---INIT-ACK(tag=a)---
1543                          *   <----CE(tag=t)------------- *2
1544                          *
1545                          * At point *1 we should be generating a different
1546                          * tag t'. Which means we would throw away the CE and send
1547                          * ours instead. Basically this is case C (throw away side).
1548                          */
1549                         if (how_indx < sizeof(asoc->cookie_how))
1550                                 asoc->cookie_how[how_indx] = 17;
1551                         return (NULL);
1552
1553                 }
1554                 switch (SCTP_GET_STATE(asoc)) {
1555                 case SCTP_STATE_COOKIE_WAIT:
1556                 case SCTP_STATE_COOKIE_ECHOED:
1557                         /*
1558                          * INIT was sent but got a COOKIE_ECHO with the
1559                          * correct tags... just accept it...but we must
1560                          * process the init so that we can make sure we have
1561                          * the right seq no's.
1562                          */
1563                         /* First we must process the INIT !! */
1564                         retval = sctp_process_init(init_cp, stcb);
1565                         if (retval < 0) {
1566                                 if (how_indx < sizeof(asoc->cookie_how))
1567                                         asoc->cookie_how[how_indx] = 3;
1568                                 return (NULL);
1569                         }
1570                         /* we have already processed the INIT so no problem */
1571                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1572                             stcb, net,
1573                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1574                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1575                             stcb, net,
1576                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1577                         /* update current state */
1578                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1579                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1580                         else
1581                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1582
1583                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1584                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1585                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1586                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1587                         }
1588                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1589                         sctp_stop_all_cookie_timers(stcb);
1590                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1591                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1592                             (inp->sctp_socket->so_qlimit == 0)
1593                             ) {
1594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1595                                 struct socket *so;
1596
1597 #endif
1598                                 /*
1599                                  * Here is where collision would go if we
1600                                  * did a connect() and instead got a
1601                                  * init/init-ack/cookie done before the
1602                                  * init-ack came back..
1603                                  */
1604                                 stcb->sctp_ep->sctp_flags |=
1605                                     SCTP_PCB_FLAGS_CONNECTED;
1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1607                                 so = SCTP_INP_SO(stcb->sctp_ep);
1608                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1609                                 SCTP_TCB_UNLOCK(stcb);
1610                                 SCTP_SOCKET_LOCK(so, 1);
1611                                 SCTP_TCB_LOCK(stcb);
1612                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1613                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1614                                         SCTP_SOCKET_UNLOCK(so, 1);
1615                                         return (NULL);
1616                                 }
1617 #endif
1618                                 soisconnected(stcb->sctp_socket);
1619 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1620                                 SCTP_SOCKET_UNLOCK(so, 1);
1621 #endif
1622                         }
1623                         /* notify upper layer */
1624                         *notification = SCTP_NOTIFY_ASSOC_UP;
1625                         /*
1626                          * since we did not send a HB make sure we don't
1627                          * double things
1628                          */
1629                         net->hb_responded = 1;
1630                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1631                             &cookie->time_entered,
1632                             sctp_align_unsafe_makecopy,
1633                             SCTP_RTT_FROM_NON_DATA);
1634
1635                         if (stcb->asoc.sctp_autoclose_ticks &&
1636                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1637                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1638                                     inp, stcb, NULL);
1639                         }
1640                         break;
1641                 default:
1642                         /*
1643                          * we're in the OPEN state (or beyond), so peer must
1644                          * have simply lost the COOKIE-ACK
1645                          */
1646                         break;
1647                 }               /* end switch */
1648                 sctp_stop_all_cookie_timers(stcb);
1649                 /*
1650                  * We ignore the return code here.. not sure if we should
1651                  * somehow abort.. but we do have an existing asoc. This
1652                  * really should not fail.
1653                  */
1654                 if (sctp_load_addresses_from_init(stcb, m,
1655                     init_offset + sizeof(struct sctp_init_chunk),
1656                     initack_offset, src, dst, init_src)) {
1657                         if (how_indx < sizeof(asoc->cookie_how))
1658                                 asoc->cookie_how[how_indx] = 4;
1659                         return (NULL);
1660                 }
1661                 /* respond with a COOKIE-ACK */
1662                 sctp_toss_old_cookies(stcb, asoc);
1663                 sctp_send_cookie_ack(stcb);
1664                 if (how_indx < sizeof(asoc->cookie_how))
1665                         asoc->cookie_how[how_indx] = 5;
1666                 return (stcb);
1667         }
1668         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1669             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1670             cookie->tie_tag_my_vtag == 0 &&
1671             cookie->tie_tag_peer_vtag == 0) {
1672                 /*
1673                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1674                  */
1675                 if (how_indx < sizeof(asoc->cookie_how))
1676                         asoc->cookie_how[how_indx] = 6;
1677                 return (NULL);
1678         }
1679         /*
1680          * If nat support, and the below and stcb is established, send back
1681          * a ABORT(colliding state) if we are established.
1682          */
1683         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1684             (asoc->peer_supports_nat) &&
1685             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1686             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1687             (asoc->peer_vtag == 0)))) {
1688                 /*
1689                  * Special case - Peer's support nat. We may have two init's
1690                  * that we gave out the same tag on since one was not
1691                  * established.. i.e. we get INIT from host-1 behind the nat
1692                  * and we respond tag-a, we get a INIT from host-2 behind
1693                  * the nat and we get tag-a again. Then we bring up host-1
1694                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1695                  * Now we have colliding state. We must send an abort here
1696                  * with colliding state indication.
1697                  */
1698                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1699                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1700                     mflowtype, mflowid, inp->fibnum,
1701                     vrf_id, port);
1702                 return (NULL);
1703         }
1704         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1705             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1706             (asoc->peer_vtag == 0))) {
1707                 /*
1708                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1709                  * should be ok, re-accept peer info
1710                  */
1711                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1712                         /*
1713                          * Extension of case C. If we hit this, then the
1714                          * random number generator returned the same vtag
1715                          * when we first sent our INIT-ACK and when we later
1716                          * sent our INIT. The side with the seq numbers that
1717                          * are different will be the one that normnally
1718                          * would have hit case C. This in effect "extends"
1719                          * our vtags in this collision case to be 64 bits.
1720                          * The same collision could occur aka you get both
1721                          * vtag and seq number the same twice in a row.. but
1722                          * is much less likely. If it did happen then we
1723                          * would proceed through and bring up the assoc.. we
1724                          * may end up with the wrong stream setup however..
1725                          * which would be bad.. but there is no way to
1726                          * tell.. until we send on a stream that does not
1727                          * exist :-)
1728                          */
1729                         if (how_indx < sizeof(asoc->cookie_how))
1730                                 asoc->cookie_how[how_indx] = 7;
1731
1732                         return (NULL);
1733                 }
1734                 if (how_indx < sizeof(asoc->cookie_how))
1735                         asoc->cookie_how[how_indx] = 8;
1736                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1737                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1738                 sctp_stop_all_cookie_timers(stcb);
1739                 /*
1740                  * since we did not send a HB make sure we don't double
1741                  * things
1742                  */
1743                 net->hb_responded = 1;
1744                 if (stcb->asoc.sctp_autoclose_ticks &&
1745                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1746                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1747                             NULL);
1748                 }
1749                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1750                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1751
1752                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1753                         /*
1754                          * Ok the peer probably discarded our data (if we
1755                          * echoed a cookie+data). So anything on the
1756                          * sent_queue should be marked for retransmit, we
1757                          * may not get something to kick us so it COULD
1758                          * still take a timeout to move these.. but it can't
1759                          * hurt to mark them.
1760                          */
1761                         struct sctp_tmit_chunk *chk;
1762
1763                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1764                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1765                                         chk->sent = SCTP_DATAGRAM_RESEND;
1766                                         sctp_flight_size_decrease(chk);
1767                                         sctp_total_flight_decrease(stcb, chk);
1768                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1769                                         spec_flag++;
1770                                 }
1771                         }
1772
1773                 }
1774                 /* process the INIT info (peer's info) */
1775                 retval = sctp_process_init(init_cp, stcb);
1776                 if (retval < 0) {
1777                         if (how_indx < sizeof(asoc->cookie_how))
1778                                 asoc->cookie_how[how_indx] = 9;
1779                         return (NULL);
1780                 }
1781                 if (sctp_load_addresses_from_init(stcb, m,
1782                     init_offset + sizeof(struct sctp_init_chunk),
1783                     initack_offset, src, dst, init_src)) {
1784                         if (how_indx < sizeof(asoc->cookie_how))
1785                                 asoc->cookie_how[how_indx] = 10;
1786                         return (NULL);
1787                 }
1788                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1789                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1790                         *notification = SCTP_NOTIFY_ASSOC_UP;
1791
1792                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1793                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1794                             (inp->sctp_socket->so_qlimit == 0)) {
1795 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1796                                 struct socket *so;
1797
1798 #endif
1799                                 stcb->sctp_ep->sctp_flags |=
1800                                     SCTP_PCB_FLAGS_CONNECTED;
1801 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1802                                 so = SCTP_INP_SO(stcb->sctp_ep);
1803                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1804                                 SCTP_TCB_UNLOCK(stcb);
1805                                 SCTP_SOCKET_LOCK(so, 1);
1806                                 SCTP_TCB_LOCK(stcb);
1807                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1808                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1809                                         SCTP_SOCKET_UNLOCK(so, 1);
1810                                         return (NULL);
1811                                 }
1812 #endif
1813                                 soisconnected(stcb->sctp_socket);
1814 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1815                                 SCTP_SOCKET_UNLOCK(so, 1);
1816 #endif
1817                         }
1818                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1819                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1820                         else
1821                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1822                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1823                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1824                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1825                 } else {
1826                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1827                 }
1828                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1829                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1830                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1831                             stcb->sctp_ep, stcb, asoc->primary_destination);
1832                 }
1833                 sctp_stop_all_cookie_timers(stcb);
1834                 sctp_toss_old_cookies(stcb, asoc);
1835                 sctp_send_cookie_ack(stcb);
1836                 if (spec_flag) {
1837                         /*
1838                          * only if we have retrans set do we do this. What
1839                          * this call does is get only the COOKIE-ACK out and
1840                          * then when we return the normal call to
1841                          * sctp_chunk_output will get the retrans out behind
1842                          * this.
1843                          */
1844                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1845                 }
1846                 if (how_indx < sizeof(asoc->cookie_how))
1847                         asoc->cookie_how[how_indx] = 11;
1848
1849                 return (stcb);
1850         }
1851         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1852             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1853             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1854             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1855             cookie->tie_tag_peer_vtag != 0) {
1856                 struct sctpasochead *head;
1857
1858 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1859                 struct socket *so;
1860
1861 #endif
1862
1863                 if (asoc->peer_supports_nat) {
1864                         /*
1865                          * This is a gross gross hack. Just call the
1866                          * cookie_new code since we are allowing a duplicate
1867                          * association. I hope this works...
1868                          */
1869                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1870                             sh, cookie, cookie_len,
1871                             inp, netp, init_src, notification,
1872                             auth_skipped, auth_offset, auth_len,
1873                             mflowtype, mflowid,
1874                             vrf_id, port));
1875                 }
1876                 /*
1877                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1878                  */
1879                 /* temp code */
1880                 if (how_indx < sizeof(asoc->cookie_how))
1881                         asoc->cookie_how[how_indx] = 12;
1882                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1883                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1884                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1885                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1886
1887                 /* notify upper layer */
1888                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1889                 atomic_add_int(&stcb->asoc.refcnt, 1);
1890                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1891                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1892                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1893                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1894                 }
1895                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1896                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1897                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1898                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1899                 }
1900                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1901                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1902                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1903                             stcb->sctp_ep, stcb, asoc->primary_destination);
1904
1905                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1906                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1907                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1908                 }
1909                 asoc->pre_open_streams =
1910                     ntohs(initack_cp->init.num_outbound_streams);
1911                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1912                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1913                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1914
1915                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1916
1917                 asoc->str_reset_seq_in = asoc->init_seq_number;
1918
1919                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1920                 if (asoc->mapping_array) {
1921                         memset(asoc->mapping_array, 0,
1922                             asoc->mapping_array_size);
1923                 }
1924                 if (asoc->nr_mapping_array) {
1925                         memset(asoc->nr_mapping_array, 0,
1926                             asoc->mapping_array_size);
1927                 }
1928                 SCTP_TCB_UNLOCK(stcb);
1929 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1930                 so = SCTP_INP_SO(stcb->sctp_ep);
1931                 SCTP_SOCKET_LOCK(so, 1);
1932 #endif
1933                 SCTP_INP_INFO_WLOCK();
1934                 SCTP_INP_WLOCK(stcb->sctp_ep);
1935                 SCTP_TCB_LOCK(stcb);
1936                 atomic_add_int(&stcb->asoc.refcnt, -1);
1937                 /* send up all the data */
1938                 SCTP_TCB_SEND_LOCK(stcb);
1939
1940                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1941                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1942                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1943 #if defined(SCTP_DETAILED_STR_STATS)
1944                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1945                                 asoc->strmout[i].abandoned_sent[j] = 0;
1946                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1947                         }
1948 #else
1949                         asoc->strmout[i].abandoned_sent[0] = 0;
1950                         asoc->strmout[i].abandoned_unsent[0] = 0;
1951 #endif
1952                         stcb->asoc.strmout[i].stream_no = i;
1953                         stcb->asoc.strmout[i].next_sequence_send = 0;
1954                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1955                 }
1956                 /* process the INIT-ACK info (my info) */
1957                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1958                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1959
1960                 /* pull from vtag hash */
1961                 LIST_REMOVE(stcb, sctp_asocs);
1962                 /* re-insert to new vtag position */
1963                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1964                     SCTP_BASE_INFO(hashasocmark))];
1965                 /*
1966                  * put it in the bucket in the vtag hash of assoc's for the
1967                  * system
1968                  */
1969                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1970
1971                 SCTP_TCB_SEND_UNLOCK(stcb);
1972                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1973                 SCTP_INP_INFO_WUNLOCK();
1974 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1975                 SCTP_SOCKET_UNLOCK(so, 1);
1976 #endif
1977                 asoc->total_flight = 0;
1978                 asoc->total_flight_count = 0;
1979                 /* process the INIT info (peer's info) */
1980                 retval = sctp_process_init(init_cp, stcb);
1981                 if (retval < 0) {
1982                         if (how_indx < sizeof(asoc->cookie_how))
1983                                 asoc->cookie_how[how_indx] = 13;
1984
1985                         return (NULL);
1986                 }
1987                 /*
1988                  * since we did not send a HB make sure we don't double
1989                  * things
1990                  */
1991                 net->hb_responded = 1;
1992
1993                 if (sctp_load_addresses_from_init(stcb, m,
1994                     init_offset + sizeof(struct sctp_init_chunk),
1995                     initack_offset, src, dst, init_src)) {
1996                         if (how_indx < sizeof(asoc->cookie_how))
1997                                 asoc->cookie_how[how_indx] = 14;
1998
1999                         return (NULL);
2000                 }
2001                 /* respond with a COOKIE-ACK */
2002                 sctp_stop_all_cookie_timers(stcb);
2003                 sctp_toss_old_cookies(stcb, asoc);
2004                 sctp_send_cookie_ack(stcb);
2005                 if (how_indx < sizeof(asoc->cookie_how))
2006                         asoc->cookie_how[how_indx] = 15;
2007
2008                 return (stcb);
2009         }
2010         if (how_indx < sizeof(asoc->cookie_how))
2011                 asoc->cookie_how[how_indx] = 16;
2012         /* all other cases... */
2013         return (NULL);
2014 }
2015
2016
2017 /*
2018  * handle a state cookie for a new association m: input packet mbuf chain--
2019  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2020  * and the cookie signature does not exist offset: offset into mbuf to the
2021  * cookie-echo chunk length: length of the cookie chunk to: where the init
2022  * was from returns a new TCB
2023  */
2024 static struct sctp_tcb *
2025 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2026     struct sockaddr *src, struct sockaddr *dst,
2027     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2028     struct sctp_inpcb *inp, struct sctp_nets **netp,
2029     struct sockaddr *init_src, int *notification,
2030     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2031     uint8_t mflowtype, uint32_t mflowid,
2032     uint32_t vrf_id, uint16_t port)
2033 {
2034         struct sctp_tcb *stcb;
2035         struct sctp_init_chunk *init_cp, init_buf;
2036         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2037         union sctp_sockstore store;
2038         struct sctp_association *asoc;
2039         int init_offset, initack_offset, initack_limit;
2040         int retval;
2041         int error = 0;
2042         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2043
2044 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2045         struct socket *so;
2046
2047         so = SCTP_INP_SO(inp);
2048 #endif
2049
2050         /*
2051          * find and validate the INIT chunk in the cookie (peer's info) the
2052          * INIT should start after the cookie-echo header struct (chunk
2053          * header, state cookie header struct)
2054          */
2055         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2056         init_cp = (struct sctp_init_chunk *)
2057             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2058             (uint8_t *) & init_buf);
2059         if (init_cp == NULL) {
2060                 /* could not pull a INIT chunk in cookie */
2061                 SCTPDBG(SCTP_DEBUG_INPUT1,
2062                     "process_cookie_new: could not pull INIT chunk hdr\n");
2063                 return (NULL);
2064         }
2065         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2066                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2067                 return (NULL);
2068         }
2069         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2070         /*
2071          * find and validate the INIT-ACK chunk in the cookie (my info) the
2072          * INIT-ACK follows the INIT chunk
2073          */
2074         initack_cp = (struct sctp_init_ack_chunk *)
2075             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2076             (uint8_t *) & initack_buf);
2077         if (initack_cp == NULL) {
2078                 /* could not pull INIT-ACK chunk in cookie */
2079                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2080                 return (NULL);
2081         }
2082         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2083                 return (NULL);
2084         }
2085         /*
2086          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2087          * "initack_limit" value.  This is because the chk_length field
2088          * includes the length of the cookie, but the cookie is omitted when
2089          * the INIT and INIT_ACK are tacked onto the cookie...
2090          */
2091         initack_limit = offset + cookie_len;
2092
2093         /*
2094          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2095          * and popluate
2096          */
2097
2098         /*
2099          * Here we do a trick, we set in NULL for the proc/thread argument.
2100          * We do this since in effect we only use the p argument when the
2101          * socket is unbound and we must do an implicit bind. Since we are
2102          * getting a cookie, we cannot be unbound.
2103          */
2104         stcb = sctp_aloc_assoc(inp, init_src, &error,
2105             ntohl(initack_cp->init.initiate_tag), vrf_id,
2106             ntohs(initack_cp->init.num_outbound_streams),
2107             (struct thread *)NULL
2108             );
2109         if (stcb == NULL) {
2110                 struct mbuf *op_err;
2111
2112                 /* memory problem? */
2113                 SCTPDBG(SCTP_DEBUG_INPUT1,
2114                     "process_cookie_new: no room for another TCB!\n");
2115                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2116                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2117                     src, dst, sh, op_err,
2118                     mflowtype, mflowid,
2119                     vrf_id, port);
2120                 return (NULL);
2121         }
2122         /* get the correct sctp_nets */
2123         if (netp)
2124                 *netp = sctp_findnet(stcb, init_src);
2125
2126         asoc = &stcb->asoc;
2127         /* get scope variables out of cookie */
2128         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2129         asoc->scope.site_scope = cookie->site_scope;
2130         asoc->scope.local_scope = cookie->local_scope;
2131         asoc->scope.loopback_scope = cookie->loopback_scope;
2132
2133         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2134             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2135                 struct mbuf *op_err;
2136
2137                 /*
2138                  * Houston we have a problem. The EP changed while the
2139                  * cookie was in flight. Only recourse is to abort the
2140                  * association.
2141                  */
2142                 atomic_add_int(&stcb->asoc.refcnt, 1);
2143                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2144                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2145                     src, dst, sh, op_err,
2146                     mflowtype, mflowid,
2147                     vrf_id, port);
2148 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2149                 SCTP_TCB_UNLOCK(stcb);
2150                 SCTP_SOCKET_LOCK(so, 1);
2151                 SCTP_TCB_LOCK(stcb);
2152 #endif
2153                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2154                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2155 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2156                 SCTP_SOCKET_UNLOCK(so, 1);
2157 #endif
2158                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2159                 return (NULL);
2160         }
2161         /* process the INIT-ACK info (my info) */
2162         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2163         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2164         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2165         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2166         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2167         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2168         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2169         asoc->str_reset_seq_in = asoc->init_seq_number;
2170
2171         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2172
2173         /* process the INIT info (peer's info) */
2174         if (netp)
2175                 retval = sctp_process_init(init_cp, stcb);
2176         else
2177                 retval = 0;
2178         if (retval < 0) {
2179                 atomic_add_int(&stcb->asoc.refcnt, 1);
2180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2181                 SCTP_TCB_UNLOCK(stcb);
2182                 SCTP_SOCKET_LOCK(so, 1);
2183                 SCTP_TCB_LOCK(stcb);
2184 #endif
2185                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2186                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2187 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2188                 SCTP_SOCKET_UNLOCK(so, 1);
2189 #endif
2190                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2191                 return (NULL);
2192         }
2193         /* load all addresses */
2194         if (sctp_load_addresses_from_init(stcb, m,
2195             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2196             src, dst, init_src)) {
2197                 atomic_add_int(&stcb->asoc.refcnt, 1);
2198 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2199                 SCTP_TCB_UNLOCK(stcb);
2200                 SCTP_SOCKET_LOCK(so, 1);
2201                 SCTP_TCB_LOCK(stcb);
2202 #endif
2203                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2204                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2205 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2206                 SCTP_SOCKET_UNLOCK(so, 1);
2207 #endif
2208                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2209                 return (NULL);
2210         }
2211         /*
2212          * verify any preceding AUTH chunk that was skipped
2213          */
2214         /* pull the local authentication parameters from the cookie/init-ack */
2215         sctp_auth_get_cookie_params(stcb, m,
2216             initack_offset + sizeof(struct sctp_init_ack_chunk),
2217             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2218         if (auth_skipped) {
2219                 struct sctp_auth_chunk *auth;
2220
2221                 auth = (struct sctp_auth_chunk *)
2222                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2223                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2224                         /* auth HMAC failed, dump the assoc and packet */
2225                         SCTPDBG(SCTP_DEBUG_AUTH1,
2226                             "COOKIE-ECHO: AUTH failed\n");
2227                         atomic_add_int(&stcb->asoc.refcnt, 1);
2228 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2229                         SCTP_TCB_UNLOCK(stcb);
2230                         SCTP_SOCKET_LOCK(so, 1);
2231                         SCTP_TCB_LOCK(stcb);
2232 #endif
2233                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2234                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2236                         SCTP_SOCKET_UNLOCK(so, 1);
2237 #endif
2238                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2239                         return (NULL);
2240                 } else {
2241                         /* remaining chunks checked... good to go */
2242                         stcb->asoc.authenticated = 1;
2243                 }
2244         }
2245         /* update current state */
2246         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2247         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2248         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2249                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2250                     stcb->sctp_ep, stcb, asoc->primary_destination);
2251         }
2252         sctp_stop_all_cookie_timers(stcb);
2253         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2254         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2255
2256         /*
2257          * if we're doing ASCONFs, check to see if we have any new local
2258          * addresses that need to get added to the peer (eg. addresses
2259          * changed while cookie echo in flight).  This needs to be done
2260          * after we go to the OPEN state to do the correct asconf
2261          * processing. else, make sure we have the correct addresses in our
2262          * lists
2263          */
2264
2265         /* warning, we re-use sin, sin6, sa_store here! */
2266         /* pull in local_address (our "from" address) */
2267         switch (cookie->laddr_type) {
2268 #ifdef INET
2269         case SCTP_IPV4_ADDRESS:
2270                 /* source addr is IPv4 */
2271                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2272                 store.sin.sin_family = AF_INET;
2273                 store.sin.sin_len = sizeof(struct sockaddr_in);
2274                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2275                 break;
2276 #endif
2277 #ifdef INET6
2278         case SCTP_IPV6_ADDRESS:
2279                 /* source addr is IPv6 */
2280                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2281                 store.sin6.sin6_family = AF_INET6;
2282                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2283                 store.sin6.sin6_scope_id = cookie->scope_id;
2284                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2285                 break;
2286 #endif
2287         default:
2288                 atomic_add_int(&stcb->asoc.refcnt, 1);
2289 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2290                 SCTP_TCB_UNLOCK(stcb);
2291                 SCTP_SOCKET_LOCK(so, 1);
2292                 SCTP_TCB_LOCK(stcb);
2293 #endif
2294                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2295                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2297                 SCTP_SOCKET_UNLOCK(so, 1);
2298 #endif
2299                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2300                 return (NULL);
2301         }
2302
2303         /* set up to notify upper layer */
2304         *notification = SCTP_NOTIFY_ASSOC_UP;
2305         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2306             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2307             (inp->sctp_socket->so_qlimit == 0)) {
2308                 /*
2309                  * This is an endpoint that called connect() how it got a
2310                  * cookie that is NEW is a bit of a mystery. It must be that
2311                  * the INIT was sent, but before it got there.. a complete
2312                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2313                  * should have went to the other code.. not here.. oh well..
2314                  * a bit of protection is worth having..
2315                  */
2316                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2317 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2318                 atomic_add_int(&stcb->asoc.refcnt, 1);
2319                 SCTP_TCB_UNLOCK(stcb);
2320                 SCTP_SOCKET_LOCK(so, 1);
2321                 SCTP_TCB_LOCK(stcb);
2322                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2323                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2324                         SCTP_SOCKET_UNLOCK(so, 1);
2325                         return (NULL);
2326                 }
2327 #endif
2328                 soisconnected(stcb->sctp_socket);
2329 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2330                 SCTP_SOCKET_UNLOCK(so, 1);
2331 #endif
2332         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2333             (inp->sctp_socket->so_qlimit)) {
2334                 /*
2335                  * We don't want to do anything with this one. Since it is
2336                  * the listening guy. The timer will get started for
2337                  * accepted connections in the caller.
2338                  */
2339                 ;
2340         }
2341         /* since we did not send a HB make sure we don't double things */
2342         if ((netp) && (*netp))
2343                 (*netp)->hb_responded = 1;
2344
2345         if (stcb->asoc.sctp_autoclose_ticks &&
2346             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2347                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2348         }
2349         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2350         if ((netp != NULL) && (*netp != NULL)) {
2351                 /* calculate the RTT and set the encaps port */
2352                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2353                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2354                     SCTP_RTT_FROM_NON_DATA);
2355 #if defined(INET) || defined(INET6)
2356                 if (((*netp)->port == 0) && (port != 0)) {
2357                         sctp_pathmtu_adjustment(stcb, (*netp)->mtu - sizeof(struct udphdr));
2358                 }
2359                 (*netp)->port = port;
2360 #endif
2361         }
2362         /* respond with a COOKIE-ACK */
2363         sctp_send_cookie_ack(stcb);
2364
2365         /*
2366          * check the address lists for any ASCONFs that need to be sent
2367          * AFTER the cookie-ack is sent
2368          */
2369         sctp_check_address_list(stcb, m,
2370             initack_offset + sizeof(struct sctp_init_ack_chunk),
2371             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2372             &store.sa, cookie->local_scope, cookie->site_scope,
2373             cookie->ipv4_scope, cookie->loopback_scope);
2374
2375
2376         return (stcb);
2377 }
2378
2379 /*
2380  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2381  * we NEED to make sure we are not already using the vtag. If so we
2382  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2383         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2384                                                             SCTP_BASE_INFO(hashasocmark))];
2385         LIST_FOREACH(stcb, head, sctp_asocs) {
2386                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2387                        -- SEND ABORT - TRY AGAIN --
2388                 }
2389         }
2390 */
2391
2392 /*
2393  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2394  * existing (non-NULL) TCB
2395  */
2396 static struct mbuf *
2397 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2398     struct sockaddr *src, struct sockaddr *dst,
2399     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2400     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2401     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2402     struct sctp_tcb **locked_tcb,
2403     uint8_t mflowtype, uint32_t mflowid,
2404     uint32_t vrf_id, uint16_t port)
2405 {
2406         struct sctp_state_cookie *cookie;
2407         struct sctp_tcb *l_stcb = *stcb;
2408         struct sctp_inpcb *l_inp;
2409         struct sockaddr *to;
2410         struct sctp_pcb *ep;
2411         struct mbuf *m_sig;
2412         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2413         uint8_t *sig;
2414         uint8_t cookie_ok = 0;
2415         unsigned int sig_offset, cookie_offset;
2416         unsigned int cookie_len;
2417         struct timeval now;
2418         struct timeval time_expires;
2419         int notification = 0;
2420         struct sctp_nets *netl;
2421         int had_a_existing_tcb = 0;
2422         int send_int_conf = 0;
2423
2424 #ifdef INET
2425         struct sockaddr_in sin;
2426
2427 #endif
2428 #ifdef INET6
2429         struct sockaddr_in6 sin6;
2430
2431 #endif
2432
2433         SCTPDBG(SCTP_DEBUG_INPUT2,
2434             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2435
2436         if (inp_p == NULL) {
2437                 return (NULL);
2438         }
2439         cookie = &cp->cookie;
2440         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2441         cookie_len = ntohs(cp->ch.chunk_length);
2442
2443         if ((cookie->peerport != sh->src_port) ||
2444             (cookie->myport != sh->dest_port) ||
2445             (cookie->my_vtag != sh->v_tag)) {
2446                 /*
2447                  * invalid ports or bad tag.  Note that we always leave the
2448                  * v_tag in the header in network order and when we stored
2449                  * it in the my_vtag slot we also left it in network order.
2450                  * This maintains the match even though it may be in the
2451                  * opposite byte order of the machine :->
2452                  */
2453                 return (NULL);
2454         }
2455         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2456             sizeof(struct sctp_init_chunk) +
2457             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2458                 /* cookie too small */
2459                 return (NULL);
2460         }
2461         /*
2462          * split off the signature into its own mbuf (since it should not be
2463          * calculated in the sctp_hmac_m() call).
2464          */
2465         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2466         m_sig = m_split(m, sig_offset, M_NOWAIT);
2467         if (m_sig == NULL) {
2468                 /* out of memory or ?? */
2469                 return (NULL);
2470         }
2471 #ifdef SCTP_MBUF_LOGGING
2472         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2473                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2474         }
2475 #endif
2476
2477         /*
2478          * compute the signature/digest for the cookie
2479          */
2480         ep = &(*inp_p)->sctp_ep;
2481         l_inp = *inp_p;
2482         if (l_stcb) {
2483                 SCTP_TCB_UNLOCK(l_stcb);
2484         }
2485         SCTP_INP_RLOCK(l_inp);
2486         if (l_stcb) {
2487                 SCTP_TCB_LOCK(l_stcb);
2488         }
2489         /* which cookie is it? */
2490         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2491             (ep->current_secret_number != ep->last_secret_number)) {
2492                 /* it's the old cookie */
2493                 (void)sctp_hmac_m(SCTP_HMAC,
2494                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2495                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2496         } else {
2497                 /* it's the current cookie */
2498                 (void)sctp_hmac_m(SCTP_HMAC,
2499                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2500                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2501         }
2502         /* get the signature */
2503         SCTP_INP_RUNLOCK(l_inp);
2504         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2505         if (sig == NULL) {
2506                 /* couldn't find signature */
2507                 sctp_m_freem(m_sig);
2508                 return (NULL);
2509         }
2510         /* compare the received digest with the computed digest */
2511         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2512                 /* try the old cookie? */
2513                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2514                     (ep->current_secret_number != ep->last_secret_number)) {
2515                         /* compute digest with old */
2516                         (void)sctp_hmac_m(SCTP_HMAC,
2517                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2518                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2519                         /* compare */
2520                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2521                                 cookie_ok = 1;
2522                 }
2523         } else {
2524                 cookie_ok = 1;
2525         }
2526
2527         /*
2528          * Now before we continue we must reconstruct our mbuf so that
2529          * normal processing of any other chunks will work.
2530          */
2531         {
2532                 struct mbuf *m_at;
2533
2534                 m_at = m;
2535                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2536                         m_at = SCTP_BUF_NEXT(m_at);
2537                 }
2538                 SCTP_BUF_NEXT(m_at) = m_sig;
2539         }
2540
2541         if (cookie_ok == 0) {
2542                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2543                 SCTPDBG(SCTP_DEBUG_INPUT2,
2544                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2545                     (uint32_t) offset, cookie_offset, sig_offset);
2546                 return (NULL);
2547         }
2548         /*
2549          * check the cookie timestamps to be sure it's not stale
2550          */
2551         (void)SCTP_GETTIME_TIMEVAL(&now);
2552         /* Expire time is in Ticks, so we convert to seconds */
2553         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2554         time_expires.tv_usec = cookie->time_entered.tv_usec;
2555         /*
2556          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2557          * is undefined.
2558          */
2559         if (timevalcmp(&now, &time_expires, >)) {
2560                 /* cookie is stale! */
2561                 struct mbuf *op_err;
2562                 struct sctp_error_stale_cookie *cause;
2563                 uint32_t tim;
2564
2565                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2566                     0, M_NOWAIT, 1, MT_DATA);
2567                 if (op_err == NULL) {
2568                         /* FOOBAR */
2569                         return (NULL);
2570                 }
2571                 /* Set the len */
2572                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2573                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2574                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2575                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2576                     (sizeof(uint32_t))));
2577                 /* seconds to usec */
2578                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2579                 /* add in usec */
2580                 if (tim == 0)
2581                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2582                 cause->stale_time = htonl(tim);
2583                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2584                     mflowtype, mflowid, l_inp->fibnum,
2585                     vrf_id, port);
2586                 return (NULL);
2587         }
2588         /*
2589          * Now we must see with the lookup address if we have an existing
2590          * asoc. This will only happen if we were in the COOKIE-WAIT state
2591          * and a INIT collided with us and somewhere the peer sent the
2592          * cookie on another address besides the single address our assoc
2593          * had for him. In this case we will have one of the tie-tags set at
2594          * least AND the address field in the cookie can be used to look it
2595          * up.
2596          */
2597         to = NULL;
2598         switch (cookie->addr_type) {
2599 #ifdef INET6
2600         case SCTP_IPV6_ADDRESS:
2601                 memset(&sin6, 0, sizeof(sin6));
2602                 sin6.sin6_family = AF_INET6;
2603                 sin6.sin6_len = sizeof(sin6);
2604                 sin6.sin6_port = sh->src_port;
2605                 sin6.sin6_scope_id = cookie->scope_id;
2606                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2607                     sizeof(sin6.sin6_addr.s6_addr));
2608                 to = (struct sockaddr *)&sin6;
2609                 break;
2610 #endif
2611 #ifdef INET
2612         case SCTP_IPV4_ADDRESS:
2613                 memset(&sin, 0, sizeof(sin));
2614                 sin.sin_family = AF_INET;
2615                 sin.sin_len = sizeof(sin);
2616                 sin.sin_port = sh->src_port;
2617                 sin.sin_addr.s_addr = cookie->address[0];
2618                 to = (struct sockaddr *)&sin;
2619                 break;
2620 #endif
2621         default:
2622                 /* This should not happen */
2623                 return (NULL);
2624         }
2625         if (*stcb == NULL) {
2626                 /* Yep, lets check */
2627                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2628                 if (*stcb == NULL) {
2629                         /*
2630                          * We should have only got back the same inp. If we
2631                          * got back a different ep we have a problem. The
2632                          * original findep got back l_inp and now
2633                          */
2634                         if (l_inp != *inp_p) {
2635                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2636                         }
2637                 } else {
2638                         if (*locked_tcb == NULL) {
2639                                 /*
2640                                  * In this case we found the assoc only
2641                                  * after we locked the create lock. This
2642                                  * means we are in a colliding case and we
2643                                  * must make sure that we unlock the tcb if
2644                                  * its one of the cases where we throw away
2645                                  * the incoming packets.
2646                                  */
2647                                 *locked_tcb = *stcb;
2648
2649                                 /*
2650                                  * We must also increment the inp ref count
2651                                  * since the ref_count flags was set when we
2652                                  * did not find the TCB, now we found it
2653                                  * which reduces the refcount.. we must
2654                                  * raise it back out to balance it all :-)
2655                                  */
2656                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2657                                 if ((*stcb)->sctp_ep != l_inp) {
2658                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2659                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2660                                 }
2661                         }
2662                 }
2663         }
2664         cookie_len -= SCTP_SIGNATURE_SIZE;
2665         if (*stcb == NULL) {
2666                 /* this is the "normal" case... get a new TCB */
2667                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2668                     cookie, cookie_len, *inp_p,
2669                     netp, to, &notification,
2670                     auth_skipped, auth_offset, auth_len,
2671                     mflowtype, mflowid,
2672                     vrf_id, port);
2673         } else {
2674                 /* this is abnormal... cookie-echo on existing TCB */
2675                 had_a_existing_tcb = 1;
2676                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2677                     src, dst, sh,
2678                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2679                     &notification, auth_skipped, auth_offset, auth_len,
2680                     mflowtype, mflowid,
2681                     vrf_id, port);
2682         }
2683
2684         if (*stcb == NULL) {
2685                 /* still no TCB... must be bad cookie-echo */
2686                 return (NULL);
2687         }
2688         if (*netp != NULL) {
2689                 (*netp)->flowtype = mflowtype;
2690                 (*netp)->flowid = mflowid;
2691         }
2692         /*
2693          * Ok, we built an association so confirm the address we sent the
2694          * INIT-ACK to.
2695          */
2696         netl = sctp_findnet(*stcb, to);
2697         /*
2698          * This code should in theory NOT run but
2699          */
2700         if (netl == NULL) {
2701                 /* TSNH! Huh, why do I need to add this address here? */
2702                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2703                         return (NULL);
2704                 }
2705                 netl = sctp_findnet(*stcb, to);
2706         }
2707         if (netl) {
2708                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2709                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2710                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2711                             netl);
2712                         send_int_conf = 1;
2713                 }
2714         }
2715         sctp_start_net_timers(*stcb);
2716         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2717                 if (!had_a_existing_tcb ||
2718                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2719                         /*
2720                          * If we have a NEW cookie or the connect never
2721                          * reached the connected state during collision we
2722                          * must do the TCP accept thing.
2723                          */
2724                         struct socket *so, *oso;
2725                         struct sctp_inpcb *inp;
2726
2727                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2728                                 /*
2729                                  * For a restart we will keep the same
2730                                  * socket, no need to do anything. I THINK!!
2731                                  */
2732                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2733                                 if (send_int_conf) {
2734                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2735                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2736                                 }
2737                                 return (m);
2738                         }
2739                         oso = (*inp_p)->sctp_socket;
2740                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2741                         SCTP_TCB_UNLOCK((*stcb));
2742                         CURVNET_SET(oso->so_vnet);
2743                         so = sonewconn(oso, 0
2744                             );
2745                         CURVNET_RESTORE();
2746                         SCTP_TCB_LOCK((*stcb));
2747                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2748
2749                         if (so == NULL) {
2750                                 struct mbuf *op_err;
2751
2752 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2753                                 struct socket *pcb_so;
2754
2755 #endif
2756                                 /* Too many sockets */
2757                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2758                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2759                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2760                                     src, dst, sh, op_err,
2761                                     mflowtype, mflowid,
2762                                     vrf_id, port);
2763 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2764                                 pcb_so = SCTP_INP_SO(*inp_p);
2765                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2766                                 SCTP_TCB_UNLOCK((*stcb));
2767                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2768                                 SCTP_TCB_LOCK((*stcb));
2769                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2770 #endif
2771                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2772                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2773 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2774                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2775 #endif
2776                                 return (NULL);
2777                         }
2778                         inp = (struct sctp_inpcb *)so->so_pcb;
2779                         SCTP_INP_INCR_REF(inp);
2780                         /*
2781                          * We add the unbound flag here so that if we get an
2782                          * soabort() before we get the move_pcb done, we
2783                          * will properly cleanup.
2784                          */
2785                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2786                             SCTP_PCB_FLAGS_CONNECTED |
2787                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2788                             SCTP_PCB_FLAGS_UNBOUND |
2789                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2790                             SCTP_PCB_FLAGS_DONT_WAKE);
2791                         inp->sctp_features = (*inp_p)->sctp_features;
2792                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2793                         inp->sctp_socket = so;
2794                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2795                         inp->max_cwnd = (*inp_p)->max_cwnd;
2796                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2797                         inp->ecn_supported = (*inp_p)->ecn_supported;
2798                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2799                         inp->auth_supported = (*inp_p)->auth_supported;
2800                         inp->asconf_supported = (*inp_p)->asconf_supported;
2801                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2802                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2803                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2804                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2805                         inp->sctp_context = (*inp_p)->sctp_context;
2806                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2807                         inp->fibnum = (*inp_p)->fibnum;
2808                         inp->inp_starting_point_for_iterator = NULL;
2809                         /*
2810                          * copy in the authentication parameters from the
2811                          * original endpoint
2812                          */
2813                         if (inp->sctp_ep.local_hmacs)
2814                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2815                         inp->sctp_ep.local_hmacs =
2816                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2817                         if (inp->sctp_ep.local_auth_chunks)
2818                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2819                         inp->sctp_ep.local_auth_chunks =
2820                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2821
2822                         /*
2823                          * Now we must move it from one hash table to
2824                          * another and get the tcb in the right place.
2825                          */
2826
2827                         /*
2828                          * This is where the one-2-one socket is put into
2829                          * the accept state waiting for the accept!
2830                          */
2831                         if (*stcb) {
2832                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2833                         }
2834                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2835
2836                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2837                         SCTP_TCB_UNLOCK((*stcb));
2838
2839                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2840                             0);
2841                         SCTP_TCB_LOCK((*stcb));
2842                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2843
2844
2845                         /*
2846                          * now we must check to see if we were aborted while
2847                          * the move was going on and the lock/unlock
2848                          * happened.
2849                          */
2850                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2851                                 /*
2852                                  * yep it was, we leave the assoc attached
2853                                  * to the socket since the sctp_inpcb_free()
2854                                  * call will send an abort for us.
2855                                  */
2856                                 SCTP_INP_DECR_REF(inp);
2857                                 return (NULL);
2858                         }
2859                         SCTP_INP_DECR_REF(inp);
2860                         /* Switch over to the new guy */
2861                         *inp_p = inp;
2862                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2863                         if (send_int_conf) {
2864                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2865                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2866                         }
2867                         /*
2868                          * Pull it from the incomplete queue and wake the
2869                          * guy
2870                          */
2871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2872                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2873                         SCTP_TCB_UNLOCK((*stcb));
2874                         SCTP_SOCKET_LOCK(so, 1);
2875 #endif
2876                         soisconnected(so);
2877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2878                         SCTP_TCB_LOCK((*stcb));
2879                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2880                         SCTP_SOCKET_UNLOCK(so, 1);
2881 #endif
2882                         return (m);
2883                 }
2884         }
2885         if (notification) {
2886                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2887         }
2888         if (send_int_conf) {
2889                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2890                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2891         }
2892         return (m);
2893 }
2894
2895 static void
2896 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2897     struct sctp_tcb *stcb, struct sctp_nets *net)
2898 {
2899         /* cp must not be used, others call this without a c-ack :-) */
2900         struct sctp_association *asoc;
2901
2902         SCTPDBG(SCTP_DEBUG_INPUT2,
2903             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2904         if ((stcb == NULL) || (net == NULL)) {
2905                 return;
2906         }
2907         asoc = &stcb->asoc;
2908
2909         sctp_stop_all_cookie_timers(stcb);
2910         /* process according to association state */
2911         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2912                 /* state change only needed when I am in right state */
2913                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2914                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2915                 sctp_start_net_timers(stcb);
2916                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2917                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2918                             stcb->sctp_ep, stcb, asoc->primary_destination);
2919
2920                 }
2921                 /* update RTO */
2922                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2923                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2924                 if (asoc->overall_error_count == 0) {
2925                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2926                             &asoc->time_entered, sctp_align_safe_nocopy,
2927                             SCTP_RTT_FROM_NON_DATA);
2928                 }
2929                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2930                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2931                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2932                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2934                         struct socket *so;
2935
2936 #endif
2937                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2938 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2939                         so = SCTP_INP_SO(stcb->sctp_ep);
2940                         atomic_add_int(&stcb->asoc.refcnt, 1);
2941                         SCTP_TCB_UNLOCK(stcb);
2942                         SCTP_SOCKET_LOCK(so, 1);
2943                         SCTP_TCB_LOCK(stcb);
2944                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2945 #endif
2946                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2947                                 soisconnected(stcb->sctp_socket);
2948                         }
2949 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2950                         SCTP_SOCKET_UNLOCK(so, 1);
2951 #endif
2952                 }
2953                 /*
2954                  * since we did not send a HB make sure we don't double
2955                  * things
2956                  */
2957                 net->hb_responded = 1;
2958
2959                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2960                         /*
2961                          * We don't need to do the asconf thing, nor hb or
2962                          * autoclose if the socket is closed.
2963                          */
2964                         goto closed_socket;
2965                 }
2966                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2967                     stcb, net);
2968
2969
2970                 if (stcb->asoc.sctp_autoclose_ticks &&
2971                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2972                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2973                             stcb->sctp_ep, stcb, NULL);
2974                 }
2975                 /*
2976                  * send ASCONF if parameters are pending and ASCONFs are
2977                  * allowed (eg. addresses changed when init/cookie echo were
2978                  * in flight)
2979                  */
2980                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2981                     (stcb->asoc.asconf_supported == 1) &&
2982                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2983 #ifdef SCTP_TIMER_BASED_ASCONF
2984                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2985                             stcb->sctp_ep, stcb,
2986                             stcb->asoc.primary_destination);
2987 #else
2988                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2989                             SCTP_ADDR_NOT_LOCKED);
2990 #endif
2991                 }
2992         }
2993 closed_socket:
2994         /* Toss the cookie if I can */
2995         sctp_toss_old_cookies(stcb, asoc);
2996         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2997                 /* Restart the timer if we have pending data */
2998                 struct sctp_tmit_chunk *chk;
2999
3000                 chk = TAILQ_FIRST(&asoc->sent_queue);
3001                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3002         }
3003 }
3004
3005 static void
3006 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3007     struct sctp_tcb *stcb)
3008 {
3009         struct sctp_nets *net;
3010         struct sctp_tmit_chunk *lchk;
3011         struct sctp_ecne_chunk bkup;
3012         uint8_t override_bit;
3013         uint32_t tsn, window_data_tsn;
3014         int len;
3015         unsigned int pkt_cnt;
3016
3017         len = ntohs(cp->ch.chunk_length);
3018         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3019             (len != sizeof(struct old_sctp_ecne_chunk))) {
3020                 return;
3021         }
3022         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3023                 /* Its the old format */
3024                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3025                 bkup.num_pkts_since_cwr = htonl(1);
3026                 cp = &bkup;
3027         }
3028         SCTP_STAT_INCR(sctps_recvecne);
3029         tsn = ntohl(cp->tsn);
3030         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3031         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3032         if (lchk == NULL) {
3033                 window_data_tsn = stcb->asoc.sending_seq - 1;
3034         } else {
3035                 window_data_tsn = lchk->rec.data.TSN_seq;
3036         }
3037
3038         /* Find where it was sent to if possible. */
3039         net = NULL;
3040         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3041                 if (lchk->rec.data.TSN_seq == tsn) {
3042                         net = lchk->whoTo;
3043                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3044                         break;
3045                 }
3046                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3047                         break;
3048                 }
3049         }
3050         if (net == NULL) {
3051                 /*
3052                  * What to do. A previous send of a CWR was possibly lost.
3053                  * See how old it is, we may have it marked on the actual
3054                  * net.
3055                  */
3056                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3057                         if (tsn == net->last_cwr_tsn) {
3058                                 /* Found him, send it off */
3059                                 break;
3060                         }
3061                 }
3062                 if (net == NULL) {
3063                         /*
3064                          * If we reach here, we need to send a special CWR
3065                          * that says hey, we did this a long time ago and
3066                          * you lost the response.
3067                          */
3068                         net = TAILQ_FIRST(&stcb->asoc.nets);
3069                         if (net == NULL) {
3070                                 /* TSNH */
3071                                 return;
3072                         }
3073                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3074                 } else {
3075                         override_bit = 0;
3076                 }
3077         } else {
3078                 override_bit = 0;
3079         }
3080         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3081             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3082                 /*
3083                  * JRS - Use the congestion control given in the pluggable
3084                  * CC module
3085                  */
3086                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3087                 /*
3088                  * We reduce once every RTT. So we will only lower cwnd at
3089                  * the next sending seq i.e. the window_data_tsn
3090                  */
3091                 net->cwr_window_tsn = window_data_tsn;
3092                 net->ecn_ce_pkt_cnt += pkt_cnt;
3093                 net->lost_cnt = pkt_cnt;
3094                 net->last_cwr_tsn = tsn;
3095         } else {
3096                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3097                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3098                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3099                         /*
3100                          * Another loss in the same window update how many
3101                          * marks/packets lost we have had.
3102                          */
3103                         int cnt = 1;
3104
3105                         if (pkt_cnt > net->lost_cnt) {
3106                                 /* Should be the case */
3107                                 cnt = (pkt_cnt - net->lost_cnt);
3108                                 net->ecn_ce_pkt_cnt += cnt;
3109                         }
3110                         net->lost_cnt = pkt_cnt;
3111                         net->last_cwr_tsn = tsn;
3112                         /*
3113                          * Most CC functions will ignore this call, since we
3114                          * are in-window yet of the initial CE the peer saw.
3115                          */
3116                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3117                 }
3118         }
3119         /*
3120          * We always send a CWR this way if our previous one was lost our
3121          * peer will get an update, or if it is not time again to reduce we
3122          * still get the cwr to the peer. Note we set the override when we
3123          * could not find the TSN on the chunk or the destination network.
3124          */
3125         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3126 }
3127
3128 static void
3129 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3130 {
3131         /*
3132          * Here we get a CWR from the peer. We must look in the outqueue and
3133          * make sure that we have a covered ECNE in the control chunk part.
3134          * If so remove it.
3135          */
3136         struct sctp_tmit_chunk *chk;
3137         struct sctp_ecne_chunk *ecne;
3138         int override;
3139         uint32_t cwr_tsn;
3140
3141         cwr_tsn = ntohl(cp->tsn);
3142         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3143         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3144                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3145                         continue;
3146                 }
3147                 if ((override == 0) && (chk->whoTo != net)) {
3148                         /* Must be from the right src unless override is set */
3149                         continue;
3150                 }
3151                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3152                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3153                         /* this covers this ECNE, we can remove it */
3154                         stcb->asoc.ecn_echo_cnt_onq--;
3155                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3156                             sctp_next);
3157                         sctp_m_freem(chk->data);
3158                         chk->data = NULL;
3159                         stcb->asoc.ctrl_queue_cnt--;
3160                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3161                         if (override == 0) {
3162                                 break;
3163                         }
3164                 }
3165         }
3166 }
3167
3168 static void
3169 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3170     struct sctp_tcb *stcb, struct sctp_nets *net)
3171 {
3172         struct sctp_association *asoc;
3173
3174 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3175         struct socket *so;
3176
3177 #endif
3178
3179         SCTPDBG(SCTP_DEBUG_INPUT2,
3180             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3181         if (stcb == NULL)
3182                 return;
3183
3184         asoc = &stcb->asoc;
3185         /* process according to association state */
3186         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3187                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3188                 SCTPDBG(SCTP_DEBUG_INPUT2,
3189                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3190                 SCTP_TCB_UNLOCK(stcb);
3191                 return;
3192         }
3193         /* notify upper layer protocol */
3194         if (stcb->sctp_socket) {
3195                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3196         }
3197 #ifdef INVARIANTS
3198         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3199             !TAILQ_EMPTY(&asoc->sent_queue) ||
3200             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3201                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3202         }
3203 #endif
3204         /* stop the timer */
3205         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3206             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3207         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3208         /* free the TCB */
3209         SCTPDBG(SCTP_DEBUG_INPUT2,
3210             "sctp_handle_shutdown_complete: calls free-asoc\n");
3211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3212         so = SCTP_INP_SO(stcb->sctp_ep);
3213         atomic_add_int(&stcb->asoc.refcnt, 1);
3214         SCTP_TCB_UNLOCK(stcb);
3215         SCTP_SOCKET_LOCK(so, 1);
3216         SCTP_TCB_LOCK(stcb);
3217         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3218 #endif
3219         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3220             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3221 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3222         SCTP_SOCKET_UNLOCK(so, 1);
3223 #endif
3224         return;
3225 }
3226
3227 static int
3228 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3229     struct sctp_nets *net, uint8_t flg)
3230 {
3231         switch (desc->chunk_type) {
3232         case SCTP_DATA:
3233                 /* find the tsn to resend (possibly */
3234                 {
3235                         uint32_t tsn;
3236                         struct sctp_tmit_chunk *tp1;
3237
3238                         tsn = ntohl(desc->tsn_ifany);
3239                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3240                                 if (tp1->rec.data.TSN_seq == tsn) {
3241                                         /* found it */
3242                                         break;
3243                                 }
3244                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3245                                         /* not found */
3246                                         tp1 = NULL;
3247                                         break;
3248                                 }
3249                         }
3250                         if (tp1 == NULL) {
3251                                 /*
3252                                  * Do it the other way , aka without paying
3253                                  * attention to queue seq order.
3254                                  */
3255                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3256                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3257                                         if (tp1->rec.data.TSN_seq == tsn) {
3258                                                 /* found it */
3259                                                 break;
3260                                         }
3261                                 }
3262                         }
3263                         if (tp1 == NULL) {
3264                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3265                         }
3266                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3267                                 uint8_t *ddp;
3268
3269                                 if (((flg & SCTP_BADCRC) == 0) &&
3270                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3271                                         return (0);
3272                                 }
3273                                 if ((stcb->asoc.peers_rwnd == 0) &&
3274                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3275                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3276                                         return (0);
3277                                 }
3278                                 if (stcb->asoc.peers_rwnd == 0 &&
3279                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3280                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3281                                         return (0);
3282                                 }
3283                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3284                                     sizeof(struct sctp_data_chunk));
3285                                 {
3286                                         unsigned int iii;
3287
3288                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3289                                             iii++) {
3290                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3291                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3292                                                         return (-1);
3293                                                 }
3294                                         }
3295                                 }
3296
3297                                 if (tp1->do_rtt) {
3298                                         /*
3299                                          * this guy had a RTO calculation
3300                                          * pending on it, cancel it
3301                                          */
3302                                         if (tp1->whoTo->rto_needed == 0) {
3303                                                 tp1->whoTo->rto_needed = 1;
3304                                         }
3305                                         tp1->do_rtt = 0;
3306                                 }
3307                                 SCTP_STAT_INCR(sctps_pdrpmark);
3308                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3309                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3310                                 /*
3311                                  * mark it as if we were doing a FR, since
3312                                  * we will be getting gap ack reports behind
3313                                  * the info from the router.
3314                                  */
3315                                 tp1->rec.data.doing_fast_retransmit = 1;
3316                                 /*
3317                                  * mark the tsn with what sequences can
3318                                  * cause a new FR.
3319                                  */
3320                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3321                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3322                                 } else {
3323                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3324                                 }
3325
3326                                 /* restart the timer */
3327                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3328                                     stcb, tp1->whoTo,
3329                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3330                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3331                                     stcb, tp1->whoTo);
3332
3333                                 /* fix counts and things */
3334                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3335                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3336                                             tp1->whoTo->flight_size,
3337                                             tp1->book_size,
3338                                             (uintptr_t) stcb,
3339                                             tp1->rec.data.TSN_seq);
3340                                 }
3341                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3342                                         sctp_flight_size_decrease(tp1);
3343                                         sctp_total_flight_decrease(stcb, tp1);
3344                                 }
3345                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3346                         } {
3347                                 /* audit code */
3348                                 unsigned int audit;
3349
3350                                 audit = 0;
3351                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3352                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3353                                                 audit++;
3354                                 }
3355                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3356                                     sctp_next) {
3357                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3358                                                 audit++;
3359                                 }
3360                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3361                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3362                                             audit, stcb->asoc.sent_queue_retran_cnt);
3363 #ifndef SCTP_AUDITING_ENABLED
3364                                         stcb->asoc.sent_queue_retran_cnt = audit;
3365 #endif
3366                                 }
3367                         }
3368                 }
3369                 break;
3370         case SCTP_ASCONF:
3371                 {
3372                         struct sctp_tmit_chunk *asconf;
3373
3374                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3375                             sctp_next) {
3376                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3377                                         break;
3378                                 }
3379                         }
3380                         if (asconf) {
3381                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3382                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3383                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3384                                 asconf->snd_count--;
3385                         }
3386                 }
3387                 break;
3388         case SCTP_INITIATION:
3389                 /* resend the INIT */
3390                 stcb->asoc.dropped_special_cnt++;
3391                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3392                         /*
3393                          * If we can get it in, in a few attempts we do
3394                          * this, otherwise we let the timer fire.
3395                          */
3396                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3397                             stcb, net,
3398                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3399                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3400                 }
3401                 break;
3402         case SCTP_SELECTIVE_ACK:
3403         case SCTP_NR_SELECTIVE_ACK:
3404                 /* resend the sack */
3405                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3406                 break;
3407         case SCTP_HEARTBEAT_REQUEST:
3408                 /* resend a demand HB */
3409                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3410                         /*
3411                          * Only retransmit if we KNOW we wont destroy the
3412                          * tcb
3413                          */
3414                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3415                 }
3416                 break;
3417         case SCTP_SHUTDOWN:
3418                 sctp_send_shutdown(stcb, net);
3419                 break;
3420         case SCTP_SHUTDOWN_ACK:
3421                 sctp_send_shutdown_ack(stcb, net);
3422                 break;
3423         case SCTP_COOKIE_ECHO:
3424                 {
3425                         struct sctp_tmit_chunk *cookie;
3426
3427                         cookie = NULL;
3428                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3429                             sctp_next) {
3430                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3431                                         break;
3432                                 }
3433                         }
3434                         if (cookie) {
3435                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3436                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3437                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3438                                 sctp_stop_all_cookie_timers(stcb);
3439                         }
3440                 }
3441                 break;
3442         case SCTP_COOKIE_ACK:
3443                 sctp_send_cookie_ack(stcb);
3444                 break;
3445         case SCTP_ASCONF_ACK:
3446                 /* resend last asconf ack */
3447                 sctp_send_asconf_ack(stcb);
3448                 break;
3449         case SCTP_FORWARD_CUM_TSN:
3450                 send_forward_tsn(stcb, &stcb->asoc);
3451                 break;
3452                 /* can't do anything with these */
3453         case SCTP_PACKET_DROPPED:
3454         case SCTP_INITIATION_ACK:       /* this should not happen */
3455         case SCTP_HEARTBEAT_ACK:
3456         case SCTP_ABORT_ASSOCIATION:
3457         case SCTP_OPERATION_ERROR:
3458         case SCTP_SHUTDOWN_COMPLETE:
3459         case SCTP_ECN_ECHO:
3460         case SCTP_ECN_CWR:
3461         default:
3462                 break;
3463         }
3464         return (0);
3465 }
3466
3467 void
3468 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3469 {
3470         uint32_t i;
3471         uint16_t temp;
3472
3473         /*
3474          * We set things to 0xffff since this is the last delivered sequence
3475          * and we will be sending in 0 after the reset.
3476          */
3477
3478         if (number_entries) {
3479                 for (i = 0; i < number_entries; i++) {
3480                         temp = ntohs(list[i]);
3481                         if (temp >= stcb->asoc.streamincnt) {
3482                                 continue;
3483                         }
3484                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3485                 }
3486         } else {
3487                 list = NULL;
3488                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3489                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3490                 }
3491         }
3492         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3493 }
3494
3495 static void
3496 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3497 {
3498         uint32_t i;
3499         uint16_t temp;
3500
3501         if (number_entries > 0) {
3502                 for (i = 0; i < number_entries; i++) {
3503                         temp = ntohs(list[i]);
3504                         if (temp >= stcb->asoc.streamoutcnt) {
3505                                 /* no such stream */
3506                                 continue;
3507                         }
3508                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3509                 }
3510         } else {
3511                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3512                         stcb->asoc.strmout[i].next_sequence_send = 0;
3513                 }
3514         }
3515         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3516 }
3517
3518 static void
3519 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3520 {
3521         uint32_t i;
3522         uint16_t temp;
3523
3524         if (number_entries > 0) {
3525                 for (i = 0; i < number_entries; i++) {
3526                         temp = ntohs(list[i]);
3527                         if (temp >= stcb->asoc.streamoutcnt) {
3528                                 /* no such stream */
3529                                 continue;
3530                         }
3531                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3532                 }
3533         } else {
3534                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3535                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3536                 }
3537         }
3538 }
3539
3540
3541 struct sctp_stream_reset_request *
3542 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3543 {
3544         struct sctp_association *asoc;
3545         struct sctp_chunkhdr *ch;
3546         struct sctp_stream_reset_request *r;
3547         struct sctp_tmit_chunk *chk;
3548         int len, clen;
3549
3550         asoc = &stcb->asoc;
3551         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3552                 asoc->stream_reset_outstanding = 0;
3553                 return (NULL);
3554         }
3555         if (stcb->asoc.str_reset == NULL) {
3556                 asoc->stream_reset_outstanding = 0;
3557                 return (NULL);
3558         }
3559         chk = stcb->asoc.str_reset;
3560         if (chk->data == NULL) {
3561                 return (NULL);
3562         }
3563         if (bchk) {
3564                 /* he wants a copy of the chk pointer */
3565                 *bchk = chk;
3566         }
3567         clen = chk->send_size;
3568         ch = mtod(chk->data, struct sctp_chunkhdr *);
3569         r = (struct sctp_stream_reset_request *)(ch + 1);
3570         if (ntohl(r->request_seq) == seq) {
3571                 /* found it */
3572                 return (r);
3573         }
3574         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3575         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3576                 /* move to the next one, there can only be a max of two */
3577                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3578                 if (ntohl(r->request_seq) == seq) {
3579                         return (r);
3580                 }
3581         }
3582         /* that seq is not here */
3583         return (NULL);
3584 }
3585
3586 static void
3587 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3588 {
3589         struct sctp_association *asoc;
3590         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3591
3592         if (stcb->asoc.str_reset == NULL) {
3593                 return;
3594         }
3595         asoc = &stcb->asoc;
3596
3597         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3598             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3599         TAILQ_REMOVE(&asoc->control_send_queue,
3600             chk,
3601             sctp_next);
3602         if (chk->data) {
3603                 sctp_m_freem(chk->data);
3604                 chk->data = NULL;
3605         }
3606         asoc->ctrl_queue_cnt--;
3607         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3608         /* sa_ignore NO_NULL_CHK */
3609         stcb->asoc.str_reset = NULL;
3610 }
3611
3612
3613 static int
3614 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3615     uint32_t seq, uint32_t action,
3616     struct sctp_stream_reset_response *respin)
3617 {
3618         uint16_t type;
3619         int lparm_len;
3620         struct sctp_association *asoc = &stcb->asoc;
3621         struct sctp_tmit_chunk *chk;
3622         struct sctp_stream_reset_request *req_param;
3623         struct sctp_stream_reset_out_request *req_out_param;
3624         struct sctp_stream_reset_in_request *req_in_param;
3625         uint32_t number_entries;
3626
3627         if (asoc->stream_reset_outstanding == 0) {
3628                 /* duplicate */
3629                 return (0);
3630         }
3631         if (seq == stcb->asoc.str_reset_seq_out) {
3632                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3633                 if (req_param != NULL) {
3634                         stcb->asoc.str_reset_seq_out++;
3635                         type = ntohs(req_param->ph.param_type);
3636                         lparm_len = ntohs(req_param->ph.param_length);
3637                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3638                                 int no_clear = 0;
3639
3640                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3641                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3642                                 asoc->stream_reset_out_is_outstanding = 0;
3643                                 if (asoc->stream_reset_outstanding)
3644                                         asoc->stream_reset_outstanding--;
3645                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3646                                         /* do it */
3647                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3648                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3649                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3650                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3651                                         /*
3652                                          * Set it up so we don't stop
3653                                          * retransmitting
3654                                          */
3655                                         asoc->stream_reset_outstanding++;
3656                                         stcb->asoc.str_reset_seq_out--;
3657                                         asoc->stream_reset_out_is_outstanding = 1;
3658                                         no_clear = 1;
3659                                 } else {
3660                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3661                                 }
3662                                 if (no_clear == 0) {
3663                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3664                                 }
3665                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3666                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3667                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3668                                 if (asoc->stream_reset_outstanding)
3669                                         asoc->stream_reset_outstanding--;
3670                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3671                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3672                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3673                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3674                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3675                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3676                                 }
3677                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3678                                 /* Ok we now may have more streams */
3679                                 int num_stream;
3680
3681                                 num_stream = stcb->asoc.strm_pending_add_size;
3682                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3683                                         /* TSNH */
3684                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3685                                 }
3686                                 stcb->asoc.strm_pending_add_size = 0;
3687                                 if (asoc->stream_reset_outstanding)
3688                                         asoc->stream_reset_outstanding--;
3689                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3690                                         /* Put the new streams into effect */
3691                                         int i;
3692
3693                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3694                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3695                                         }
3696                                         asoc->streamoutcnt += num_stream;
3697                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3698                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3699                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3700                                             SCTP_STREAM_CHANGE_DENIED);
3701                                 } else {
3702                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3703                                             SCTP_STREAM_CHANGE_FAILED);
3704                                 }
3705                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3706                                 if (asoc->stream_reset_outstanding)
3707                                         asoc->stream_reset_outstanding--;
3708                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3709                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3710                                             SCTP_STREAM_CHANGE_DENIED);
3711                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3712                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3713                                             SCTP_STREAM_CHANGE_FAILED);
3714                                 }
3715                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3716                                 /**
3717                                  * a) Adopt the new in tsn.
3718                                  * b) reset the map
3719                                  * c) Adopt the new out-tsn
3720                                  */
3721                                 struct sctp_stream_reset_response_tsn *resp;
3722                                 struct sctp_forward_tsn_chunk fwdtsn;
3723                                 int abort_flag = 0;
3724
3725                                 if (respin == NULL) {
3726                                         /* huh ? */
3727                                         return (0);
3728                                 }
3729                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3730                                         return (0);
3731                                 }
3732                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3733                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3734                                         asoc->stream_reset_outstanding--;
3735                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3736                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3737                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3738                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3739                                         if (abort_flag) {
3740                                                 return (1);
3741                                         }
3742                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3743                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3744                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3745                                         }
3746                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3747                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3748                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3749
3750                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3751                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3752
3753                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3754                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3755
3756                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3757                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3758                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3759                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3760                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3761                                             SCTP_ASSOC_RESET_DENIED);
3762                                 } else {
3763                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3764                                             SCTP_ASSOC_RESET_FAILED);
3765                                 }
3766                         }
3767                         /* get rid of the request and get the request flags */
3768                         if (asoc->stream_reset_outstanding == 0) {
3769                                 sctp_clean_up_stream_reset(stcb);
3770                         }
3771                 }
3772         }
3773         if (asoc->stream_reset_outstanding == 0) {
3774                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3775         }
3776         return (0);
3777 }
3778
3779 static void
3780 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3781     struct sctp_tmit_chunk *chk,
3782     struct sctp_stream_reset_in_request *req, int trunc)
3783 {
3784         uint32_t seq;
3785         int len, i;
3786         int number_entries;
3787         uint16_t temp;
3788
3789         /*
3790          * peer wants me to send a str-reset to him for my outgoing seq's if
3791          * seq_in is right.
3792          */
3793         struct sctp_association *asoc = &stcb->asoc;
3794
3795         seq = ntohl(req->request_seq);
3796         if (asoc->str_reset_seq_in == seq) {
3797                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3798                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3799                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3800                 } else if (trunc) {
3801                         /* Can't do it, since they exceeded our buffer size  */
3802                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3803                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3804                         len = ntohs(req->ph.param_length);
3805                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3806                         if (number_entries) {
3807                                 for (i = 0; i < number_entries; i++) {
3808                                         temp = ntohs(req->list_of_streams[i]);
3809                                         if (temp >= stcb->asoc.streamoutcnt) {
3810                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3811                                                 goto bad_boy;
3812                                         }
3813                                         req->list_of_streams[i] = temp;
3814                                 }
3815                                 for (i = 0; i < number_entries; i++) {
3816                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3817                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3818                                         }
3819                                 }
3820                         } else {
3821                                 /* Its all */
3822                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3823                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3824                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3825                                 }
3826                         }
3827                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3828                 } else {
3829                         /* Can't do it, since we have sent one out */
3830                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3831                 }
3832 bad_boy:
3833                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3834                 asoc->str_reset_seq_in++;
3835         } else if (asoc->str_reset_seq_in - 1 == seq) {
3836                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3837         } else if (asoc->str_reset_seq_in - 2 == seq) {
3838                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3839         } else {
3840                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3841         }
3842         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3843 }
3844
3845 static int
3846 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3847     struct sctp_tmit_chunk *chk,
3848     struct sctp_stream_reset_tsn_request *req)
3849 {
3850         /* reset all in and out and update the tsn */
3851         /*
3852          * A) reset my str-seq's on in and out. B) Select a receive next,
3853          * and set cum-ack to it. Also process this selected number as a
3854          * fwd-tsn as well. C) set in the response my next sending seq.
3855          */
3856         struct sctp_forward_tsn_chunk fwdtsn;
3857         struct sctp_association *asoc = &stcb->asoc;
3858         int abort_flag = 0;
3859         uint32_t seq;
3860
3861         seq = ntohl(req->request_seq);
3862         if (asoc->str_reset_seq_in == seq) {
3863                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3864                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3865                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3866                 } else {
3867                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3868                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3869                         fwdtsn.ch.chunk_flags = 0;
3870                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3871                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3872                         if (abort_flag) {
3873                                 return (1);
3874                         }
3875                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3876                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3877                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3878                         }
3879                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3880                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3881                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3882                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3883                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3884                         atomic_add_int(&asoc->sending_seq, 1);
3885                         /* save off historical data for retrans */
3886                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3887                         asoc->last_sending_seq[0] = asoc->sending_seq;
3888                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3889                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3890                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3891                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3892                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3893                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3894                 }
3895                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3896                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3897                 asoc->str_reset_seq_in++;
3898         } else if (asoc->str_reset_seq_in - 1 == seq) {
3899                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3900                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3901         } else if (asoc->str_reset_seq_in - 2 == seq) {
3902                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3903                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3904         } else {
3905                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3906         }
3907         return (0);
3908 }
3909
3910 static void
3911 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3912     struct sctp_tmit_chunk *chk,
3913     struct sctp_stream_reset_out_request *req, int trunc)
3914 {
3915         uint32_t seq, tsn;
3916         int number_entries, len;
3917         struct sctp_association *asoc = &stcb->asoc;
3918
3919         seq = ntohl(req->request_seq);
3920
3921         /* now if its not a duplicate we process it */
3922         if (asoc->str_reset_seq_in == seq) {
3923                 len = ntohs(req->ph.param_length);
3924                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3925                 /*
3926                  * the sender is resetting, handle the list issue.. we must
3927                  * a) verify if we can do the reset, if so no problem b) If
3928                  * we can't do the reset we must copy the request. c) queue
3929                  * it, and setup the data in processor to trigger it off
3930                  * when needed and dequeue all the queued data.
3931                  */
3932                 tsn = ntohl(req->send_reset_at_tsn);
3933
3934                 /* move the reset action back one */
3935                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3936                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3937                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3938                 } else if (trunc) {
3939                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3940                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3941                         /* we can do it now */
3942                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3943                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3944                 } else {
3945                         /*
3946                          * we must queue it up and thus wait for the TSN's
3947                          * to arrive that are at or before tsn
3948                          */
3949                         struct sctp_stream_reset_list *liste;
3950                         int siz;
3951
3952                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3953                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3954                             siz, SCTP_M_STRESET);
3955                         if (liste == NULL) {
3956                                 /* gak out of memory */
3957                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3958                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3959                                 return;
3960                         }
3961                         liste->seq = seq;
3962                         liste->tsn = tsn;
3963                         liste->number_entries = number_entries;
3964                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3965                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3966                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3967                 }
3968                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3969                 asoc->str_reset_seq_in++;
3970         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3971                 /*
3972                  * one seq back, just echo back last action since my
3973                  * response was lost.
3974                  */
3975                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3976         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3977                 /*
3978                  * two seq back, just echo back last action since my
3979                  * response was lost.
3980                  */
3981                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3982         } else {
3983                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3984         }
3985 }
3986
3987 static void
3988 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3989     struct sctp_stream_reset_add_strm *str_add)
3990 {
3991         /*
3992          * Peer is requesting to add more streams. If its within our
3993          * max-streams we will allow it.
3994          */
3995         uint32_t num_stream, i;
3996         uint32_t seq;
3997         struct sctp_association *asoc = &stcb->asoc;
3998         struct sctp_queued_to_read *ctl, *nctl;
3999
4000         /* Get the number. */
4001         seq = ntohl(str_add->request_seq);
4002         num_stream = ntohs(str_add->number_of_streams);
4003         /* Now what would be the new total? */
4004         if (asoc->str_reset_seq_in == seq) {
4005                 num_stream += stcb->asoc.streamincnt;
4006                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4007                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4008                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4009                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4010                     (num_stream > 0xffff)) {
4011                         /* We must reject it they ask for to many */
4012         denied:
4013                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4014                 } else {
4015                         /* Ok, we can do that :-) */
4016                         struct sctp_stream_in *oldstrm;
4017
4018                         /* save off the old */
4019                         oldstrm = stcb->asoc.strmin;
4020                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4021                             (num_stream * sizeof(struct sctp_stream_in)),
4022                             SCTP_M_STRMI);
4023                         if (stcb->asoc.strmin == NULL) {
4024                                 stcb->asoc.strmin = oldstrm;
4025                                 goto denied;
4026                         }
4027                         /* copy off the old data */
4028                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4029                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4030                                 stcb->asoc.strmin[i].stream_no = i;
4031                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4032                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4033                                 /* now anything on those queues? */
4034                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
4035                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
4036                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
4037                                 }
4038                         }
4039                         /* Init the new streams */
4040                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4041                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4042                                 stcb->asoc.strmin[i].stream_no = i;
4043                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
4044                                 stcb->asoc.strmin[i].delivery_started = 0;
4045                         }
4046                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4047                         /* update the size */
4048                         stcb->asoc.streamincnt = num_stream;
4049                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4050                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4051                 }
4052                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4053                 asoc->str_reset_seq_in++;
4054         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4055                 /*
4056                  * one seq back, just echo back last action since my
4057                  * response was lost.
4058                  */
4059                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4060         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4061                 /*
4062                  * two seq back, just echo back last action since my
4063                  * response was lost.
4064                  */
4065                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4066         } else {
4067                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4068
4069         }
4070 }
4071
4072 static void
4073 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4074     struct sctp_stream_reset_add_strm *str_add)
4075 {
4076         /*
4077          * Peer is requesting to add more streams. If its within our
4078          * max-streams we will allow it.
4079          */
4080         uint16_t num_stream;
4081         uint32_t seq;
4082         struct sctp_association *asoc = &stcb->asoc;
4083
4084         /* Get the number. */
4085         seq = ntohl(str_add->request_seq);
4086         num_stream = ntohs(str_add->number_of_streams);
4087         /* Now what would be the new total? */
4088         if (asoc->str_reset_seq_in == seq) {
4089                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4090                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4091                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4092                 } else if (stcb->asoc.stream_reset_outstanding) {
4093                         /* We must reject it we have something pending */
4094                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4095                 } else {
4096                         /* Ok, we can do that :-) */
4097                         int mychk;
4098
4099                         mychk = stcb->asoc.streamoutcnt;
4100                         mychk += num_stream;
4101                         if (mychk < 0x10000) {
4102                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4103                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4104                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4105                                 }
4106                         } else {
4107                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4108                         }
4109                 }
4110                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4111                 asoc->str_reset_seq_in++;
4112         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4113                 /*
4114                  * one seq back, just echo back last action since my
4115                  * response was lost.
4116                  */
4117                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4118         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4119                 /*
4120                  * two seq back, just echo back last action since my
4121                  * response was lost.
4122                  */
4123                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4124         } else {
4125                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4126         }
4127 }
4128
4129 #ifdef __GNUC__
4130 __attribute__((noinline))
4131 #endif
4132         static int
4133             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4134         struct sctp_chunkhdr *ch_req)
4135 {
4136         uint16_t remaining_length, param_len, ptype;
4137         struct sctp_paramhdr pstore;
4138         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4139         uint32_t seq = 0;
4140         int num_req = 0;
4141         int trunc = 0;
4142         struct sctp_tmit_chunk *chk;
4143         struct sctp_chunkhdr *ch;
4144         struct sctp_paramhdr *ph;
4145         int ret_code = 0;
4146         int num_param = 0;
4147
4148         /* now it may be a reset or a reset-response */
4149         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4150
4151         /* setup for adding the response */
4152         sctp_alloc_a_chunk(stcb, chk);
4153         if (chk == NULL) {
4154                 return (ret_code);
4155         }
4156         chk->copy_by_ref = 0;
4157         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4158         chk->rec.chunk_id.can_take_data = 0;
4159         chk->flags = 0;
4160         chk->asoc = &stcb->asoc;
4161         chk->no_fr_allowed = 0;
4162         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4163         chk->book_size_scale = 0;
4164         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4165         if (chk->data == NULL) {
4166 strres_nochunk:
4167                 if (chk->data) {
4168                         sctp_m_freem(chk->data);
4169                         chk->data = NULL;
4170                 }
4171                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4172                 return (ret_code);
4173         }
4174         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4175
4176         /* setup chunk parameters */
4177         chk->sent = SCTP_DATAGRAM_UNSENT;
4178         chk->snd_count = 0;
4179         chk->whoTo = NULL;
4180
4181         ch = mtod(chk->data, struct sctp_chunkhdr *);
4182         ch->chunk_type = SCTP_STREAM_RESET;
4183         ch->chunk_flags = 0;
4184         ch->chunk_length = htons(chk->send_size);
4185         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4186         offset += sizeof(struct sctp_chunkhdr);
4187         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4188                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4189                 if (ph == NULL) {
4190                         /* TSNH */
4191                         break;
4192                 }
4193                 param_len = ntohs(ph->param_length);
4194                 if ((param_len > remaining_length) ||
4195                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4196                         /* bad parameter length */
4197                         break;
4198                 }
4199                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4200                     (uint8_t *) & cstore);
4201                 if (ph == NULL) {
4202                         /* TSNH */
4203                         break;
4204                 }
4205                 ptype = ntohs(ph->param_type);
4206                 num_param++;
4207                 if (param_len > sizeof(cstore)) {
4208                         trunc = 1;
4209                 } else {
4210                         trunc = 0;
4211                 }
4212                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4213                         /* hit the max of parameters already sorry.. */
4214                         break;
4215                 }
4216                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4217                         struct sctp_stream_reset_out_request *req_out;
4218
4219                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4220                                 break;
4221                         }
4222                         req_out = (struct sctp_stream_reset_out_request *)ph;
4223                         num_req++;
4224                         if (stcb->asoc.stream_reset_outstanding) {
4225                                 seq = ntohl(req_out->response_seq);
4226                                 if (seq == stcb->asoc.str_reset_seq_out) {
4227                                         /* implicit ack */
4228                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4229                                 }
4230                         }
4231                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4232                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4233                         struct sctp_stream_reset_add_strm *str_add;
4234
4235                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4236                                 break;
4237                         }
4238                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4239                         num_req++;
4240                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4241                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4242                         struct sctp_stream_reset_add_strm *str_add;
4243
4244                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4245                                 break;
4246                         }
4247                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4248                         num_req++;
4249                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4250                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4251                         struct sctp_stream_reset_in_request *req_in;
4252
4253                         num_req++;
4254                         req_in = (struct sctp_stream_reset_in_request *)ph;
4255                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4256                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4257                         struct sctp_stream_reset_tsn_request *req_tsn;
4258
4259                         num_req++;
4260                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4261                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4262                                 ret_code = 1;
4263                                 goto strres_nochunk;
4264                         }
4265                         /* no more */
4266                         break;
4267                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4268                         struct sctp_stream_reset_response *resp;
4269                         uint32_t result;
4270
4271                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4272                                 break;
4273                         }
4274                         resp = (struct sctp_stream_reset_response *)ph;
4275                         seq = ntohl(resp->response_seq);
4276                         result = ntohl(resp->result);
4277                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4278                                 ret_code = 1;
4279                                 goto strres_nochunk;
4280                         }
4281                 } else {
4282                         break;
4283                 }
4284                 offset += SCTP_SIZE32(param_len);
4285                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4286                         remaining_length -= SCTP_SIZE32(param_len);
4287                 } else {
4288                         remaining_length = 0;
4289                 }
4290         }
4291         if (num_req == 0) {
4292                 /* we have no response free the stuff */
4293                 goto strres_nochunk;
4294         }
4295         /* ok we have a chunk to link in */
4296         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4297             chk,
4298             sctp_next);
4299         stcb->asoc.ctrl_queue_cnt++;
4300         return (ret_code);
4301 }
4302
4303 /*
4304  * Handle a router or endpoints report of a packet loss, there are two ways
4305  * to handle this, either we get the whole packet and must disect it
4306  * ourselves (possibly with truncation and or corruption) or it is a summary
4307  * from a middle box that did the disectting for us.
4308  */
4309 static void
4310 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4311     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4312 {
4313         uint32_t bottle_bw, on_queue;
4314         uint16_t trunc_len;
4315         unsigned int chlen;
4316         unsigned int at;
4317         struct sctp_chunk_desc desc;
4318         struct sctp_chunkhdr *ch;
4319
4320         chlen = ntohs(cp->ch.chunk_length);
4321         chlen -= sizeof(struct sctp_pktdrop_chunk);
4322         /* XXX possible chlen underflow */
4323         if (chlen == 0) {
4324                 ch = NULL;
4325                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4326                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4327         } else {
4328                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4329                 chlen -= sizeof(struct sctphdr);
4330                 /* XXX possible chlen underflow */
4331                 memset(&desc, 0, sizeof(desc));
4332         }
4333         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4334         if (trunc_len > limit) {
4335                 trunc_len = limit;
4336         }
4337         /* now the chunks themselves */
4338         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4339                 desc.chunk_type = ch->chunk_type;
4340                 /* get amount we need to move */
4341                 at = ntohs(ch->chunk_length);
4342                 if (at < sizeof(struct sctp_chunkhdr)) {
4343                         /* corrupt chunk, maybe at the end? */
4344                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4345                         break;
4346                 }
4347                 if (trunc_len == 0) {
4348                         /* we are supposed to have all of it */
4349                         if (at > chlen) {
4350                                 /* corrupt skip it */
4351                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4352                                 break;
4353                         }
4354                 } else {
4355                         /* is there enough of it left ? */
4356                         if (desc.chunk_type == SCTP_DATA) {
4357                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4358                                     sizeof(desc.data_bytes))) {
4359                                         break;
4360                                 }
4361                         } else {
4362                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4363                                         break;
4364                                 }
4365                         }
4366                 }
4367                 if (desc.chunk_type == SCTP_DATA) {
4368                         /* can we get out the tsn? */
4369                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4370                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4371
4372                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4373                                 /* yep */
4374                                 struct sctp_data_chunk *dcp;
4375                                 uint8_t *ddp;
4376                                 unsigned int iii;
4377
4378                                 dcp = (struct sctp_data_chunk *)ch;
4379                                 ddp = (uint8_t *) (dcp + 1);
4380                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4381                                         desc.data_bytes[iii] = ddp[iii];
4382                                 }
4383                                 desc.tsn_ifany = dcp->dp.tsn;
4384                         } else {
4385                                 /* nope we are done. */
4386                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4387                                 break;
4388                         }
4389                 } else {
4390                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4391                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4392                 }
4393
4394                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4395                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4396                         break;
4397                 }
4398                 if (SCTP_SIZE32(at) > chlen) {
4399                         break;
4400                 }
4401                 chlen -= SCTP_SIZE32(at);
4402                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4403                         /* done, none left */
4404                         break;
4405                 }
4406                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4407         }
4408         /* Now update any rwnd --- possibly */
4409         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4410                 /* From a peer, we get a rwnd report */
4411                 uint32_t a_rwnd;
4412
4413                 SCTP_STAT_INCR(sctps_pdrpfehos);
4414
4415                 bottle_bw = ntohl(cp->bottle_bw);
4416                 on_queue = ntohl(cp->current_onq);
4417                 if (bottle_bw && on_queue) {
4418                         /* a rwnd report is in here */
4419                         if (bottle_bw > on_queue)
4420                                 a_rwnd = bottle_bw - on_queue;
4421                         else
4422                                 a_rwnd = 0;
4423
4424                         if (a_rwnd == 0)
4425                                 stcb->asoc.peers_rwnd = 0;
4426                         else {
4427                                 if (a_rwnd > stcb->asoc.total_flight) {
4428                                         stcb->asoc.peers_rwnd =
4429                                             a_rwnd - stcb->asoc.total_flight;
4430                                 } else {
4431                                         stcb->asoc.peers_rwnd = 0;
4432                                 }
4433                                 if (stcb->asoc.peers_rwnd <
4434                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4435                                         /* SWS sender side engages */
4436                                         stcb->asoc.peers_rwnd = 0;
4437                                 }
4438                         }
4439                 }
4440         } else {
4441                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4442         }
4443
4444         /* now middle boxes in sat networks get a cwnd bump */
4445         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4446             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4447             (stcb->asoc.sat_network)) {
4448                 /*
4449                  * This is debateable but for sat networks it makes sense
4450                  * Note if a T3 timer has went off, we will prohibit any
4451                  * changes to cwnd until we exit the t3 loss recovery.
4452                  */
4453                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4454                     net, cp, &bottle_bw, &on_queue);
4455         }
4456 }
4457
4458 /*
4459  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4460  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4461  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4462  * length of the complete packet outputs: - length: modified to remaining
4463  * length after control processing - netp: modified to new sctp_nets after
4464  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4465  * bad packet,...) otherwise return the tcb for this packet
4466  */
4467 #ifdef __GNUC__
4468 __attribute__((noinline))
4469 #endif
4470         static struct sctp_tcb *
4471                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4472              struct sockaddr *src, struct sockaddr *dst,
4473              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4474              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4475              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4476              uint32_t vrf_id, uint16_t port)
4477 {
4478         struct sctp_association *asoc;
4479         struct mbuf *op_err;
4480         char msg[SCTP_DIAG_INFO_LEN];
4481         uint32_t vtag_in;
4482         int num_chunks = 0;     /* number of control chunks processed */
4483         uint32_t chk_length;
4484         int ret;
4485         int abort_no_unlock = 0;
4486         int ecne_seen = 0;
4487
4488         /*
4489          * How big should this be, and should it be alloc'd? Lets try the
4490          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4491          * until we get into jumbo grams and such..
4492          */
4493         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4494         struct sctp_tcb *locked_tcb = stcb;
4495         int got_auth = 0;
4496         uint32_t auth_offset = 0, auth_len = 0;
4497         int auth_skipped = 0;
4498         int asconf_cnt = 0;
4499
4500 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4501         struct socket *so;
4502
4503 #endif
4504
4505         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4506             iphlen, *offset, length, (void *)stcb);
4507
4508         /* validate chunk header length... */
4509         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4510                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4511                     ntohs(ch->chunk_length));
4512                 if (locked_tcb) {
4513                         SCTP_TCB_UNLOCK(locked_tcb);
4514                 }
4515                 return (NULL);
4516         }
4517         /*
4518          * validate the verification tag
4519          */
4520         vtag_in = ntohl(sh->v_tag);
4521
4522         if (locked_tcb) {
4523                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4524         }
4525         if (ch->chunk_type == SCTP_INITIATION) {
4526                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4527                     ntohs(ch->chunk_length), vtag_in);
4528                 if (vtag_in != 0) {
4529                         /* protocol error- silently discard... */
4530                         SCTP_STAT_INCR(sctps_badvtag);
4531                         if (locked_tcb) {
4532                                 SCTP_TCB_UNLOCK(locked_tcb);
4533                         }
4534                         return (NULL);
4535                 }
4536         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4537                 /*
4538                  * If there is no stcb, skip the AUTH chunk and process
4539                  * later after a stcb is found (to validate the lookup was
4540                  * valid.
4541                  */
4542                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4543                     (stcb == NULL) &&
4544                     (inp->auth_supported == 1)) {
4545                         /* save this chunk for later processing */
4546                         auth_skipped = 1;
4547                         auth_offset = *offset;
4548                         auth_len = ntohs(ch->chunk_length);
4549
4550                         /* (temporarily) move past this chunk */
4551                         *offset += SCTP_SIZE32(auth_len);
4552                         if (*offset >= length) {
4553                                 /* no more data left in the mbuf chain */
4554                                 *offset = length;
4555                                 if (locked_tcb) {
4556                                         SCTP_TCB_UNLOCK(locked_tcb);
4557                                 }
4558                                 return (NULL);
4559                         }
4560                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4561                             sizeof(struct sctp_chunkhdr), chunk_buf);
4562                 }
4563                 if (ch == NULL) {
4564                         /* Help */
4565                         *offset = length;
4566                         if (locked_tcb) {
4567                                 SCTP_TCB_UNLOCK(locked_tcb);
4568                         }
4569                         return (NULL);
4570                 }
4571                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4572                         goto process_control_chunks;
4573                 }
4574                 /*
4575                  * first check if it's an ASCONF with an unknown src addr we
4576                  * need to look inside to find the association
4577                  */
4578                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4579                         struct sctp_chunkhdr *asconf_ch = ch;
4580                         uint32_t asconf_offset = 0, asconf_len = 0;
4581
4582                         /* inp's refcount may be reduced */
4583                         SCTP_INP_INCR_REF(inp);
4584
4585                         asconf_offset = *offset;
4586                         do {
4587                                 asconf_len = ntohs(asconf_ch->chunk_length);
4588                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4589                                         break;
4590                                 stcb = sctp_findassociation_ep_asconf(m,
4591                                     *offset,
4592                                     dst,
4593                                     sh, &inp, netp, vrf_id);
4594                                 if (stcb != NULL)
4595                                         break;
4596                                 asconf_offset += SCTP_SIZE32(asconf_len);
4597                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4598                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4599                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4600                         if (stcb == NULL) {
4601                                 /*
4602                                  * reduce inp's refcount if not reduced in
4603                                  * sctp_findassociation_ep_asconf().
4604                                  */
4605                                 SCTP_INP_DECR_REF(inp);
4606                         } else {
4607                                 locked_tcb = stcb;
4608                         }
4609
4610                         /* now go back and verify any auth chunk to be sure */
4611                         if (auth_skipped && (stcb != NULL)) {
4612                                 struct sctp_auth_chunk *auth;
4613
4614                                 auth = (struct sctp_auth_chunk *)
4615                                     sctp_m_getptr(m, auth_offset,
4616                                     auth_len, chunk_buf);
4617                                 got_auth = 1;
4618                                 auth_skipped = 0;
4619                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4620                                     auth_offset)) {
4621                                         /* auth HMAC failed so dump it */
4622                                         *offset = length;
4623                                         if (locked_tcb) {
4624                                                 SCTP_TCB_UNLOCK(locked_tcb);
4625                                         }
4626                                         return (NULL);
4627                                 } else {
4628                                         /* remaining chunks are HMAC checked */
4629                                         stcb->asoc.authenticated = 1;
4630                                 }
4631                         }
4632                 }
4633                 if (stcb == NULL) {
4634                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4635                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4636                             msg);
4637                         /* no association, so it's out of the blue... */
4638                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4639                             mflowtype, mflowid, inp->fibnum,
4640                             vrf_id, port);
4641                         *offset = length;
4642                         if (locked_tcb) {
4643                                 SCTP_TCB_UNLOCK(locked_tcb);
4644                         }
4645                         return (NULL);
4646                 }
4647                 asoc = &stcb->asoc;
4648                 /* ABORT and SHUTDOWN can use either v_tag... */
4649                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4650                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4651                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4652                         /* Take the T-bit always into account. */
4653                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4654                             (vtag_in == asoc->my_vtag)) ||
4655                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4656                             (vtag_in == asoc->peer_vtag))) {
4657                                 /* this is valid */
4658                         } else {
4659                                 /* drop this packet... */
4660                                 SCTP_STAT_INCR(sctps_badvtag);
4661                                 if (locked_tcb) {
4662                                         SCTP_TCB_UNLOCK(locked_tcb);
4663                                 }
4664                                 return (NULL);
4665                         }
4666                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4667                         if (vtag_in != asoc->my_vtag) {
4668                                 /*
4669                                  * this could be a stale SHUTDOWN-ACK or the
4670                                  * peer never got the SHUTDOWN-COMPLETE and
4671                                  * is still hung; we have started a new asoc
4672                                  * but it won't complete until the shutdown
4673                                  * is completed
4674                                  */
4675                                 if (locked_tcb) {
4676                                         SCTP_TCB_UNLOCK(locked_tcb);
4677                                 }
4678                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4679                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4680                                     msg);
4681                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4682                                     sh, inp, op_err,
4683                                     mflowtype, mflowid, fibnum,
4684                                     vrf_id, port);
4685                                 return (NULL);
4686                         }
4687                 } else {
4688                         /* for all other chunks, vtag must match */
4689                         if (vtag_in != asoc->my_vtag) {
4690                                 /* invalid vtag... */
4691                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4692                                     "invalid vtag: %xh, expect %xh\n",
4693                                     vtag_in, asoc->my_vtag);
4694                                 SCTP_STAT_INCR(sctps_badvtag);
4695                                 if (locked_tcb) {
4696                                         SCTP_TCB_UNLOCK(locked_tcb);
4697                                 }
4698                                 *offset = length;
4699                                 return (NULL);
4700                         }
4701                 }
4702         }                       /* end if !SCTP_COOKIE_ECHO */
4703         /*
4704          * process all control chunks...
4705          */
4706         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4707             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4708             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4709             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4710                 /* implied cookie-ack.. we must have lost the ack */
4711                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4712                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4713                             stcb->asoc.overall_error_count,
4714                             0,
4715                             SCTP_FROM_SCTP_INPUT,
4716                             __LINE__);
4717                 }
4718                 stcb->asoc.overall_error_count = 0;
4719                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4720                     *netp);
4721         }
4722 process_control_chunks:
4723         while (IS_SCTP_CONTROL(ch)) {
4724                 /* validate chunk length */
4725                 chk_length = ntohs(ch->chunk_length);
4726                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4727                     ch->chunk_type, chk_length);
4728                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4729                 if (chk_length < sizeof(*ch) ||
4730                     (*offset + (int)chk_length) > length) {
4731                         *offset = length;
4732                         if (locked_tcb) {
4733                                 SCTP_TCB_UNLOCK(locked_tcb);
4734                         }
4735                         return (NULL);
4736                 }
4737                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4738                 /*
4739                  * INIT-ACK only gets the init ack "header" portion only
4740                  * because we don't have to process the peer's COOKIE. All
4741                  * others get a complete chunk.
4742                  */
4743                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4744                     (ch->chunk_type == SCTP_INITIATION)) {
4745                         /* get an init-ack chunk */
4746                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4747                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4748                         if (ch == NULL) {
4749                                 *offset = length;
4750                                 if (locked_tcb) {
4751                                         SCTP_TCB_UNLOCK(locked_tcb);
4752                                 }
4753                                 return (NULL);
4754                         }
4755                 } else {
4756                         /* For cookies and all other chunks. */
4757                         if (chk_length > sizeof(chunk_buf)) {
4758                                 /*
4759                                  * use just the size of the chunk buffer so
4760                                  * the front part of our chunks fit in
4761                                  * contiguous space up to the chunk buffer
4762                                  * size (508 bytes). For chunks that need to
4763                                  * get more than that they must use the
4764                                  * sctp_m_getptr() function or other means
4765                                  * (e.g. know how to parse mbuf chains).
4766                                  * Cookies do this already.
4767                                  */
4768                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4769                                     (sizeof(chunk_buf) - 4),
4770                                     chunk_buf);
4771                                 if (ch == NULL) {
4772                                         *offset = length;
4773                                         if (locked_tcb) {
4774                                                 SCTP_TCB_UNLOCK(locked_tcb);
4775                                         }
4776                                         return (NULL);
4777                                 }
4778                         } else {
4779                                 /* We can fit it all */
4780                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4781                                     chk_length, chunk_buf);
4782                                 if (ch == NULL) {
4783                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4784                                         *offset = length;
4785                                         if (locked_tcb) {
4786                                                 SCTP_TCB_UNLOCK(locked_tcb);
4787                                         }
4788                                         return (NULL);
4789                                 }
4790                         }
4791                 }
4792                 num_chunks++;
4793                 /* Save off the last place we got a control from */
4794                 if (stcb != NULL) {
4795                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4796                                 /*
4797                                  * allow last_control to be NULL if
4798                                  * ASCONF... ASCONF processing will find the
4799                                  * right net later
4800                                  */
4801                                 if ((netp != NULL) && (*netp != NULL))
4802                                         stcb->asoc.last_control_chunk_from = *netp;
4803                         }
4804                 }
4805 #ifdef SCTP_AUDITING_ENABLED
4806                 sctp_audit_log(0xB0, ch->chunk_type);
4807 #endif
4808
4809                 /* check to see if this chunk required auth, but isn't */
4810                 if ((stcb != NULL) &&
4811                     (stcb->asoc.auth_supported == 1) &&
4812                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4813                     !stcb->asoc.authenticated) {
4814                         /* "silently" ignore */
4815                         SCTP_STAT_INCR(sctps_recvauthmissing);
4816                         goto next_chunk;
4817                 }
4818                 switch (ch->chunk_type) {
4819                 case SCTP_INITIATION:
4820                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4821                         /* The INIT chunk must be the only chunk. */
4822                         if ((num_chunks > 1) ||
4823                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4824                                 /* RFC 4960 requires that no ABORT is sent */
4825                                 *offset = length;
4826                                 if (locked_tcb) {
4827                                         SCTP_TCB_UNLOCK(locked_tcb);
4828                                 }
4829                                 return (NULL);
4830                         }
4831                         /* Honor our resource limit. */
4832                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4833                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4834                                 sctp_abort_association(inp, stcb, m, iphlen,
4835                                     src, dst, sh, op_err,
4836                                     mflowtype, mflowid,
4837                                     vrf_id, port);
4838                                 *offset = length;
4839                                 return (NULL);
4840                         }
4841                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4842                             (struct sctp_init_chunk *)ch, inp,
4843                             stcb, &abort_no_unlock,
4844                             mflowtype, mflowid,
4845                             vrf_id, port);
4846                         *offset = length;
4847                         if ((!abort_no_unlock) && (locked_tcb)) {
4848                                 SCTP_TCB_UNLOCK(locked_tcb);
4849                         }
4850                         return (NULL);
4851                         break;
4852                 case SCTP_PAD_CHUNK:
4853                         break;
4854                 case SCTP_INITIATION_ACK:
4855                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4856                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4857                                 /* We are not interested anymore */
4858                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4859                                         ;
4860                                 } else {
4861                                         if (locked_tcb != stcb) {
4862                                                 /* Very unlikely */
4863                                                 SCTP_TCB_UNLOCK(locked_tcb);
4864                                         }
4865                                         *offset = length;
4866                                         if (stcb) {
4867 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4868                                                 so = SCTP_INP_SO(inp);
4869                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4870                                                 SCTP_TCB_UNLOCK(stcb);
4871                                                 SCTP_SOCKET_LOCK(so, 1);
4872                                                 SCTP_TCB_LOCK(stcb);
4873                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4874 #endif
4875                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4876                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4878                                                 SCTP_SOCKET_UNLOCK(so, 1);
4879 #endif
4880                                         }
4881                                         return (NULL);
4882                                 }
4883                         }
4884                         /* The INIT-ACK chunk must be the only chunk. */
4885                         if ((num_chunks > 1) ||
4886                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4887                                 *offset = length;
4888                                 if (locked_tcb) {
4889                                         SCTP_TCB_UNLOCK(locked_tcb);
4890                                 }
4891                                 return (NULL);
4892                         }
4893                         if ((netp) && (*netp)) {
4894                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4895                                     src, dst, sh,
4896                                     (struct sctp_init_ack_chunk *)ch,
4897                                     stcb, *netp,
4898                                     &abort_no_unlock,
4899                                     mflowtype, mflowid,
4900                                     vrf_id);
4901                         } else {
4902                                 ret = -1;
4903                         }
4904                         *offset = length;
4905                         if (abort_no_unlock) {
4906                                 return (NULL);
4907                         }
4908                         /*
4909                          * Special case, I must call the output routine to
4910                          * get the cookie echoed
4911                          */
4912                         if ((stcb != NULL) && (ret == 0)) {
4913                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4914                         }
4915                         if (locked_tcb) {
4916                                 SCTP_TCB_UNLOCK(locked_tcb);
4917                         }
4918                         return (NULL);
4919                         break;
4920                 case SCTP_SELECTIVE_ACK:
4921                         {
4922                                 struct sctp_sack_chunk *sack;
4923                                 int abort_now = 0;
4924                                 uint32_t a_rwnd, cum_ack;
4925                                 uint16_t num_seg, num_dup;
4926                                 uint8_t flags;
4927                                 int offset_seg, offset_dup;
4928
4929                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4930                                 SCTP_STAT_INCR(sctps_recvsacks);
4931                                 if (stcb == NULL) {
4932                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4933                                         break;
4934                                 }
4935                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4936                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4937                                         break;
4938                                 }
4939                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4940                                         /*-
4941                                          * If we have sent a shutdown-ack, we will pay no
4942                                          * attention to a sack sent in to us since
4943                                          * we don't care anymore.
4944                                          */
4945                                         break;
4946                                 }
4947                                 sack = (struct sctp_sack_chunk *)ch;
4948                                 flags = ch->chunk_flags;
4949                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4950                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4951                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4952                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4953                                 if (sizeof(struct sctp_sack_chunk) +
4954                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4955                                     num_dup * sizeof(uint32_t) != chk_length) {
4956                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4957                                         break;
4958                                 }
4959                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4960                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4961                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4962                                     cum_ack, num_seg, a_rwnd);
4963                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4964                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4965                                     (num_seg == 0) &&
4966                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4967                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4968                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4969                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4970                                     ) {
4971                                         /*
4972                                          * We have a SIMPLE sack having no
4973                                          * prior segments and data on sent
4974                                          * queue to be acked.. Use the
4975                                          * faster path sack processing. We
4976                                          * also allow window update sacks
4977                                          * with no missing segments to go
4978                                          * this way too.
4979                                          */
4980                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4981                                 } else {
4982                                         if (netp && *netp)
4983                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4984                                                     num_seg, 0, num_dup, &abort_now, flags,
4985                                                     cum_ack, a_rwnd, ecne_seen);
4986                                 }
4987                                 if (abort_now) {
4988                                         /* ABORT signal from sack processing */
4989                                         *offset = length;
4990                                         return (NULL);
4991                                 }
4992                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4993                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4994                                     (stcb->asoc.stream_queue_cnt == 0)) {
4995                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4996                                 }
4997                         }
4998                         break;
4999                         /*
5000                          * EY - nr_sack:  If the received chunk is an
5001                          * nr_sack chunk
5002                          */
5003                 case SCTP_NR_SELECTIVE_ACK:
5004                         {
5005                                 struct sctp_nr_sack_chunk *nr_sack;
5006                                 int abort_now = 0;
5007                                 uint32_t a_rwnd, cum_ack;
5008                                 uint16_t num_seg, num_nr_seg, num_dup;
5009                                 uint8_t flags;
5010                                 int offset_seg, offset_dup;
5011
5012                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5013                                 SCTP_STAT_INCR(sctps_recvsacks);
5014                                 if (stcb == NULL) {
5015                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5016                                         break;
5017                                 }
5018                                 if (stcb->asoc.nrsack_supported == 0) {
5019                                         goto unknown_chunk;
5020                                 }
5021                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5022                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5023                                         break;
5024                                 }
5025                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5026                                         /*-
5027                                          * If we have sent a shutdown-ack, we will pay no
5028                                          * attention to a sack sent in to us since
5029                                          * we don't care anymore.
5030                                          */
5031                                         break;
5032                                 }
5033                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5034                                 flags = ch->chunk_flags;
5035                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5036                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5037                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5038                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5039                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5040                                 if (sizeof(struct sctp_nr_sack_chunk) +
5041                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5042                                     num_dup * sizeof(uint32_t) != chk_length) {
5043                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5044                                         break;
5045                                 }
5046                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5047                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5048                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5049                                     cum_ack, num_seg, a_rwnd);
5050                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5051                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5052                                     (num_seg == 0) && (num_nr_seg == 0) &&
5053                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5054                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5055                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5056                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5057                                         /*
5058                                          * We have a SIMPLE sack having no
5059                                          * prior segments and data on sent
5060                                          * queue to be acked. Use the faster
5061                                          * path sack processing. We also
5062                                          * allow window update sacks with no
5063                                          * missing segments to go this way
5064                                          * too.
5065                                          */
5066                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5067                                             &abort_now, ecne_seen);
5068                                 } else {
5069                                         if (netp && *netp)
5070                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5071                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5072                                                     cum_ack, a_rwnd, ecne_seen);
5073                                 }
5074                                 if (abort_now) {
5075                                         /* ABORT signal from sack processing */
5076                                         *offset = length;
5077                                         return (NULL);
5078                                 }
5079                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5080                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5081                                     (stcb->asoc.stream_queue_cnt == 0)) {
5082                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5083                                 }
5084                         }
5085                         break;
5086
5087                 case SCTP_HEARTBEAT_REQUEST:
5088                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5089                         if ((stcb) && netp && *netp) {
5090                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5091                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5092                                     chk_length, *netp);
5093
5094                                 /* He's alive so give him credit */
5095                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5096                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5097                                             stcb->asoc.overall_error_count,
5098                                             0,
5099                                             SCTP_FROM_SCTP_INPUT,
5100                                             __LINE__);
5101                                 }
5102                                 stcb->asoc.overall_error_count = 0;
5103                         }
5104                         break;
5105                 case SCTP_HEARTBEAT_ACK:
5106                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5107                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5108                                 /* Its not ours */
5109                                 *offset = length;
5110                                 if (locked_tcb) {
5111                                         SCTP_TCB_UNLOCK(locked_tcb);
5112                                 }
5113                                 return (NULL);
5114                         }
5115                         /* He's alive so give him credit */
5116                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5117                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5118                                     stcb->asoc.overall_error_count,
5119                                     0,
5120                                     SCTP_FROM_SCTP_INPUT,
5121                                     __LINE__);
5122                         }
5123                         stcb->asoc.overall_error_count = 0;
5124                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5125                         if (netp && *netp)
5126                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5127                                     stcb, *netp);
5128                         break;
5129                 case SCTP_ABORT_ASSOCIATION:
5130                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5131                             (void *)stcb);
5132                         if ((stcb) && netp && *netp)
5133                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5134                                     stcb, *netp);
5135                         *offset = length;
5136                         return (NULL);
5137                         break;
5138                 case SCTP_SHUTDOWN:
5139                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5140                             (void *)stcb);
5141                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5142                                 *offset = length;
5143                                 if (locked_tcb) {
5144                                         SCTP_TCB_UNLOCK(locked_tcb);
5145                                 }
5146                                 return (NULL);
5147                         }
5148                         if (netp && *netp) {
5149                                 int abort_flag = 0;
5150
5151                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5152                                     stcb, *netp, &abort_flag);
5153                                 if (abort_flag) {
5154                                         *offset = length;
5155                                         return (NULL);
5156                                 }
5157                         }
5158                         break;
5159                 case SCTP_SHUTDOWN_ACK:
5160                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5161                         if ((stcb) && (netp) && (*netp))
5162                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5163                         *offset = length;
5164                         return (NULL);
5165                         break;
5166
5167                 case SCTP_OPERATION_ERROR:
5168                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5169                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5170                                 *offset = length;
5171                                 return (NULL);
5172                         }
5173                         break;
5174                 case SCTP_COOKIE_ECHO:
5175                         SCTPDBG(SCTP_DEBUG_INPUT3,
5176                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5177                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5178                                 ;
5179                         } else {
5180                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5181                                         /* We are not interested anymore */
5182                         abend:
5183                                         if (stcb) {
5184                                                 SCTP_TCB_UNLOCK(stcb);
5185                                         }
5186                                         *offset = length;
5187                                         return (NULL);
5188                                 }
5189                         }
5190                         /*
5191                          * First are we accepting? We do this again here
5192                          * since it is possible that a previous endpoint WAS
5193                          * listening responded to a INIT-ACK and then
5194                          * closed. We opened and bound.. and are now no
5195                          * longer listening.
5196                          */
5197
5198                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5199                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5200                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5201                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5202                                         sctp_abort_association(inp, stcb, m, iphlen,
5203                                             src, dst, sh, op_err,
5204                                             mflowtype, mflowid,
5205                                             vrf_id, port);
5206                                 }
5207                                 *offset = length;
5208                                 return (NULL);
5209                         } else {
5210                                 struct mbuf *ret_buf;
5211                                 struct sctp_inpcb *linp;
5212
5213                                 if (stcb) {
5214                                         linp = NULL;
5215                                 } else {
5216                                         linp = inp;
5217                                 }
5218
5219                                 if (linp) {
5220                                         SCTP_ASOC_CREATE_LOCK(linp);
5221                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5222                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5223                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5224                                                 goto abend;
5225                                         }
5226                                 }
5227                                 if (netp) {
5228                                         ret_buf =
5229                                             sctp_handle_cookie_echo(m, iphlen,
5230                                             *offset,
5231                                             src, dst,
5232                                             sh,
5233                                             (struct sctp_cookie_echo_chunk *)ch,
5234                                             &inp, &stcb, netp,
5235                                             auth_skipped,
5236                                             auth_offset,
5237                                             auth_len,
5238                                             &locked_tcb,
5239                                             mflowtype,
5240                                             mflowid,
5241                                             vrf_id,
5242                                             port);
5243                                 } else {
5244                                         ret_buf = NULL;
5245                                 }
5246                                 if (linp) {
5247                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5248                                 }
5249                                 if (ret_buf == NULL) {
5250                                         if (locked_tcb) {
5251                                                 SCTP_TCB_UNLOCK(locked_tcb);
5252                                         }
5253                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5254                                             "GAK, null buffer\n");
5255                                         *offset = length;
5256                                         return (NULL);
5257                                 }
5258                                 /* if AUTH skipped, see if it verified... */
5259                                 if (auth_skipped) {
5260                                         got_auth = 1;
5261                                         auth_skipped = 0;
5262                                 }
5263                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5264                                         /*
5265                                          * Restart the timer if we have
5266                                          * pending data
5267                                          */
5268                                         struct sctp_tmit_chunk *chk;
5269
5270                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5271                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5272                                 }
5273                         }
5274                         break;
5275                 case SCTP_COOKIE_ACK:
5276                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5277                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5278                                 if (locked_tcb) {
5279                                         SCTP_TCB_UNLOCK(locked_tcb);
5280                                 }
5281                                 return (NULL);
5282                         }
5283                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5284                                 /* We are not interested anymore */
5285                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5286                                         ;
5287                                 } else if (stcb) {
5288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5289                                         so = SCTP_INP_SO(inp);
5290                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5291                                         SCTP_TCB_UNLOCK(stcb);
5292                                         SCTP_SOCKET_LOCK(so, 1);
5293                                         SCTP_TCB_LOCK(stcb);
5294                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5295 #endif
5296                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5297                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5298 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5299                                         SCTP_SOCKET_UNLOCK(so, 1);
5300 #endif
5301                                         *offset = length;
5302                                         return (NULL);
5303                                 }
5304                         }
5305                         /* He's alive so give him credit */
5306                         if ((stcb) && netp && *netp) {
5307                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5308                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5309                                             stcb->asoc.overall_error_count,
5310                                             0,
5311                                             SCTP_FROM_SCTP_INPUT,
5312                                             __LINE__);
5313                                 }
5314                                 stcb->asoc.overall_error_count = 0;
5315                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5316                         }
5317                         break;
5318                 case SCTP_ECN_ECHO:
5319                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5320                         /* He's alive so give him credit */
5321                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5322                                 /* Its not ours */
5323                                 if (locked_tcb) {
5324                                         SCTP_TCB_UNLOCK(locked_tcb);
5325                                 }
5326                                 *offset = length;
5327                                 return (NULL);
5328                         }
5329                         if (stcb) {
5330                                 if (stcb->asoc.ecn_supported == 0) {
5331                                         goto unknown_chunk;
5332                                 }
5333                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5334                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5335                                             stcb->asoc.overall_error_count,
5336                                             0,
5337                                             SCTP_FROM_SCTP_INPUT,
5338                                             __LINE__);
5339                                 }
5340                                 stcb->asoc.overall_error_count = 0;
5341                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5342                                     stcb);
5343                                 ecne_seen = 1;
5344                         }
5345                         break;
5346                 case SCTP_ECN_CWR:
5347                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5348                         /* He's alive so give him credit */
5349                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5350                                 /* Its not ours */
5351                                 if (locked_tcb) {
5352                                         SCTP_TCB_UNLOCK(locked_tcb);
5353                                 }
5354                                 *offset = length;
5355                                 return (NULL);
5356                         }
5357                         if (stcb) {
5358                                 if (stcb->asoc.ecn_supported == 0) {
5359                                         goto unknown_chunk;
5360                                 }
5361                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5362                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5363                                             stcb->asoc.overall_error_count,
5364                                             0,
5365                                             SCTP_FROM_SCTP_INPUT,
5366                                             __LINE__);
5367                                 }
5368                                 stcb->asoc.overall_error_count = 0;
5369                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5370                         }
5371                         break;
5372                 case SCTP_SHUTDOWN_COMPLETE:
5373                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5374                         /* must be first and only chunk */
5375                         if ((num_chunks > 1) ||
5376                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5377                                 *offset = length;
5378                                 if (locked_tcb) {
5379                                         SCTP_TCB_UNLOCK(locked_tcb);
5380                                 }
5381                                 return (NULL);
5382                         }
5383                         if ((stcb) && netp && *netp) {
5384                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5385                                     stcb, *netp);
5386                         }
5387                         *offset = length;
5388                         return (NULL);
5389                         break;
5390                 case SCTP_ASCONF:
5391                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5392                         /* He's alive so give him credit */
5393                         if (stcb) {
5394                                 if (stcb->asoc.asconf_supported == 0) {
5395                                         goto unknown_chunk;
5396                                 }
5397                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5398                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5399                                             stcb->asoc.overall_error_count,
5400                                             0,
5401                                             SCTP_FROM_SCTP_INPUT,
5402                                             __LINE__);
5403                                 }
5404                                 stcb->asoc.overall_error_count = 0;
5405                                 sctp_handle_asconf(m, *offset, src,
5406                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5407                                 asconf_cnt++;
5408                         }
5409                         break;
5410                 case SCTP_ASCONF_ACK:
5411                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5412                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5413                                 /* Its not ours */
5414                                 if (locked_tcb) {
5415                                         SCTP_TCB_UNLOCK(locked_tcb);
5416                                 }
5417                                 *offset = length;
5418                                 return (NULL);
5419                         }
5420                         if ((stcb) && netp && *netp) {
5421                                 if (stcb->asoc.asconf_supported == 0) {
5422                                         goto unknown_chunk;
5423                                 }
5424                                 /* He's alive so give him credit */
5425                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5426                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5427                                             stcb->asoc.overall_error_count,
5428                                             0,
5429                                             SCTP_FROM_SCTP_INPUT,
5430                                             __LINE__);
5431                                 }
5432                                 stcb->asoc.overall_error_count = 0;
5433                                 sctp_handle_asconf_ack(m, *offset,
5434                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5435                                 if (abort_no_unlock)
5436                                         return (NULL);
5437                         }
5438                         break;
5439                 case SCTP_FORWARD_CUM_TSN:
5440                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5441                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5442                                 /* Its not ours */
5443                                 if (locked_tcb) {
5444                                         SCTP_TCB_UNLOCK(locked_tcb);
5445                                 }
5446                                 *offset = length;
5447                                 return (NULL);
5448                         }
5449                         /* He's alive so give him credit */
5450                         if (stcb) {
5451                                 int abort_flag = 0;
5452
5453                                 if (stcb->asoc.prsctp_supported == 0) {
5454                                         goto unknown_chunk;
5455                                 }
5456                                 stcb->asoc.overall_error_count = 0;
5457                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5458                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5459                                             stcb->asoc.overall_error_count,
5460                                             0,
5461                                             SCTP_FROM_SCTP_INPUT,
5462                                             __LINE__);
5463                                 }
5464                                 *fwd_tsn_seen = 1;
5465                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5466                                         /* We are not interested anymore */
5467 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5468                                         so = SCTP_INP_SO(inp);
5469                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5470                                         SCTP_TCB_UNLOCK(stcb);
5471                                         SCTP_SOCKET_LOCK(so, 1);
5472                                         SCTP_TCB_LOCK(stcb);
5473                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5474 #endif
5475                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5476                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5477 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5478                                         SCTP_SOCKET_UNLOCK(so, 1);
5479 #endif
5480                                         *offset = length;
5481                                         return (NULL);
5482                                 }
5483                                 sctp_handle_forward_tsn(stcb,
5484                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5485                                 if (abort_flag) {
5486                                         *offset = length;
5487                                         return (NULL);
5488                                 } else {
5489                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5490                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5491                                                     stcb->asoc.overall_error_count,
5492                                                     0,
5493                                                     SCTP_FROM_SCTP_INPUT,
5494                                                     __LINE__);
5495                                         }
5496                                         stcb->asoc.overall_error_count = 0;
5497                                 }
5498
5499                         }
5500                         break;
5501                 case SCTP_STREAM_RESET:
5502                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5503                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5504                                 /* Its not ours */
5505                                 if (locked_tcb) {
5506                                         SCTP_TCB_UNLOCK(locked_tcb);
5507                                 }
5508                                 *offset = length;
5509                                 return (NULL);
5510                         }
5511                         if (stcb->asoc.reconfig_supported == 0) {
5512                                 goto unknown_chunk;
5513                         }
5514                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5515                                 /* stop processing */
5516                                 *offset = length;
5517                                 return (NULL);
5518                         }
5519                         break;
5520                 case SCTP_PACKET_DROPPED:
5521                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5522                         /* re-get it all please */
5523                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5524                                 /* Its not ours */
5525                                 if (locked_tcb) {
5526                                         SCTP_TCB_UNLOCK(locked_tcb);
5527                                 }
5528                                 *offset = length;
5529                                 return (NULL);
5530                         }
5531                         if (ch && (stcb) && netp && (*netp)) {
5532                                 if (stcb->asoc.pktdrop_supported == 0) {
5533                                         goto unknown_chunk;
5534                                 }
5535                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5536                                     stcb, *netp,
5537                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5538
5539                         }
5540                         break;
5541                 case SCTP_AUTHENTICATION:
5542                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5543                         if (stcb == NULL) {
5544                                 /* save the first AUTH for later processing */
5545                                 if (auth_skipped == 0) {
5546                                         auth_offset = *offset;
5547                                         auth_len = chk_length;
5548                                         auth_skipped = 1;
5549                                 }
5550                                 /* skip this chunk (temporarily) */
5551                                 goto next_chunk;
5552                         }
5553                         if (stcb->asoc.auth_supported == 0) {
5554                                 goto unknown_chunk;
5555                         }
5556                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5557                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5558                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5559                                 /* Its not ours */
5560                                 if (locked_tcb) {
5561                                         SCTP_TCB_UNLOCK(locked_tcb);
5562                                 }
5563                                 *offset = length;
5564                                 return (NULL);
5565                         }
5566                         if (got_auth == 1) {
5567                                 /* skip this chunk... it's already auth'd */
5568                                 goto next_chunk;
5569                         }
5570                         got_auth = 1;
5571                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5572                             m, *offset)) {
5573                                 /* auth HMAC failed so dump the packet */
5574                                 *offset = length;
5575                                 return (stcb);
5576                         } else {
5577                                 /* remaining chunks are HMAC checked */
5578                                 stcb->asoc.authenticated = 1;
5579                         }
5580                         break;
5581
5582                 default:
5583         unknown_chunk:
5584                         /* it's an unknown chunk! */
5585                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5586                                 struct sctp_gen_error_cause *cause;
5587                                 int len;
5588
5589                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5590                                     0, M_NOWAIT, 1, MT_DATA);
5591                                 if (op_err != NULL) {
5592                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5593                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5594                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5595                                         cause->length = htons(len + sizeof(struct sctp_gen_error_cause));
5596                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5597                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5598                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5599 #ifdef SCTP_MBUF_LOGGING
5600                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5601                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5602                                                 }
5603 #endif
5604                                                 sctp_queue_op_err(stcb, op_err);
5605                                         } else {
5606                                                 sctp_m_freem(op_err);
5607                                         }
5608                                 }
5609                         }
5610                         if ((ch->chunk_type & 0x80) == 0) {
5611                                 /* discard this packet */
5612                                 *offset = length;
5613                                 return (stcb);
5614                         }       /* else skip this bad chunk and continue... */
5615                         break;
5616                 }               /* switch (ch->chunk_type) */
5617
5618
5619 next_chunk:
5620                 /* get the next chunk */
5621                 *offset += SCTP_SIZE32(chk_length);
5622                 if (*offset >= length) {
5623                         /* no more data left in the mbuf chain */
5624                         break;
5625                 }
5626                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5627                     sizeof(struct sctp_chunkhdr), chunk_buf);
5628                 if (ch == NULL) {
5629                         if (locked_tcb) {
5630                                 SCTP_TCB_UNLOCK(locked_tcb);
5631                         }
5632                         *offset = length;
5633                         return (NULL);
5634                 }
5635         }                       /* while */
5636
5637         if (asconf_cnt > 0 && stcb != NULL) {
5638                 sctp_send_asconf_ack(stcb);
5639         }
5640         return (stcb);
5641 }
5642
5643
5644 /*
5645  * common input chunk processing (v4 and v6)
5646  */
5647 void
5648 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5649     struct sockaddr *src, struct sockaddr *dst,
5650     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5651 #if !defined(SCTP_WITH_NO_CSUM)
5652     uint8_t compute_crc,
5653 #endif
5654     uint8_t ecn_bits,
5655     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5656     uint32_t vrf_id, uint16_t port)
5657 {
5658         uint32_t high_tsn;
5659         int fwd_tsn_seen = 0, data_processed = 0;
5660         struct mbuf *m = *mm, *op_err;
5661         char msg[SCTP_DIAG_INFO_LEN];
5662         int un_sent;
5663         int cnt_ctrl_ready = 0;
5664         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5665         struct sctp_tcb *stcb = NULL;
5666         struct sctp_nets *net = NULL;
5667
5668         SCTP_STAT_INCR(sctps_recvdatagrams);
5669 #ifdef SCTP_AUDITING_ENABLED
5670         sctp_audit_log(0xE0, 1);
5671         sctp_auditing(0, inp, stcb, net);
5672 #endif
5673 #if !defined(SCTP_WITH_NO_CSUM)
5674         if (compute_crc != 0) {
5675                 uint32_t check, calc_check;
5676
5677                 check = sh->checksum;
5678                 sh->checksum = 0;
5679                 calc_check = sctp_calculate_cksum(m, iphlen);
5680                 sh->checksum = check;
5681                 if (calc_check != check) {
5682                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5683                             calc_check, check, (void *)m, length, iphlen);
5684                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5685                             sh, ch, &inp, &net, vrf_id);
5686 #if defined(INET) || defined(INET6)
5687                         if ((net != NULL) && (port != 0)) {
5688                                 if (net->port == 0) {
5689                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5690                                 }
5691                                 net->port = port;
5692                         }
5693 #endif
5694                         if (net != NULL) {
5695                                 net->flowtype = mflowtype;
5696                                 net->flowid = mflowid;
5697                         }
5698                         if ((inp != NULL) && (stcb != NULL)) {
5699                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5700                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5701                         } else if ((inp != NULL) && (stcb == NULL)) {
5702                                 inp_decr = inp;
5703                         }
5704                         SCTP_STAT_INCR(sctps_badsum);
5705                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5706                         goto out;
5707                 }
5708         }
5709 #endif
5710         /* Destination port of 0 is illegal, based on RFC4960. */
5711         if (sh->dest_port == 0) {
5712                 SCTP_STAT_INCR(sctps_hdrops);
5713                 goto out;
5714         }
5715         stcb = sctp_findassociation_addr(m, offset, src, dst,
5716             sh, ch, &inp, &net, vrf_id);
5717 #if defined(INET) || defined(INET6)
5718         if ((net != NULL) && (port != 0)) {
5719                 if (net->port == 0) {
5720                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5721                 }
5722                 net->port = port;
5723         }
5724 #endif
5725         if (net != NULL) {
5726                 net->flowtype = mflowtype;
5727                 net->flowid = mflowid;
5728         }
5729         if (inp == NULL) {
5730                 SCTP_STAT_INCR(sctps_noport);
5731                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5732                         goto out;
5733                 }
5734                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5735                         sctp_send_shutdown_complete2(src, dst, sh,
5736                             mflowtype, mflowid, fibnum,
5737                             vrf_id, port);
5738                         goto out;
5739                 }
5740                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5741                         goto out;
5742                 }
5743                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5744                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5745                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5746                             (ch->chunk_type != SCTP_INIT))) {
5747                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5748                                     "Out of the blue");
5749                                 sctp_send_abort(m, iphlen, src, dst,
5750                                     sh, 0, op_err,
5751                                     mflowtype, mflowid, fibnum,
5752                                     vrf_id, port);
5753                         }
5754                 }
5755                 goto out;
5756         } else if (stcb == NULL) {
5757                 inp_decr = inp;
5758         }
5759 #ifdef IPSEC
5760         /*-
5761          * I very much doubt any of the IPSEC stuff will work but I have no
5762          * idea, so I will leave it in place.
5763          */
5764         if (inp != NULL) {
5765                 switch (dst->sa_family) {
5766 #ifdef INET
5767                 case AF_INET:
5768                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5769                                 SCTP_STAT_INCR(sctps_hdrops);
5770                                 goto out;
5771                         }
5772                         break;
5773 #endif
5774 #ifdef INET6
5775                 case AF_INET6:
5776                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5777                                 SCTP_STAT_INCR(sctps_hdrops);
5778                                 goto out;
5779                         }
5780                         break;
5781 #endif
5782                 default:
5783                         break;
5784                 }
5785         }
5786 #endif
5787         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5788             (void *)m, iphlen, offset, length, (void *)stcb);
5789         if (stcb) {
5790                 /* always clear this before beginning a packet */
5791                 stcb->asoc.authenticated = 0;
5792                 stcb->asoc.seen_a_sack_this_pkt = 0;
5793                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5794                     (void *)stcb, stcb->asoc.state);
5795
5796                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5797                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5798                         /*-
5799                          * If we hit here, we had a ref count
5800                          * up when the assoc was aborted and the
5801                          * timer is clearing out the assoc, we should
5802                          * NOT respond to any packet.. its OOTB.
5803                          */
5804                         SCTP_TCB_UNLOCK(stcb);
5805                         stcb = NULL;
5806                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5807                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5808                             msg);
5809                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5810                             mflowtype, mflowid, inp->fibnum,
5811                             vrf_id, port);
5812                         goto out;
5813                 }
5814         }
5815         if (IS_SCTP_CONTROL(ch)) {
5816                 /* process the control portion of the SCTP packet */
5817                 /* sa_ignore NO_NULL_CHK */
5818                 stcb = sctp_process_control(m, iphlen, &offset, length,
5819                     src, dst, sh, ch,
5820                     inp, stcb, &net, &fwd_tsn_seen,
5821                     mflowtype, mflowid, fibnum,
5822                     vrf_id, port);
5823                 if (stcb) {
5824                         /*
5825                          * This covers us if the cookie-echo was there and
5826                          * it changes our INP.
5827                          */
5828                         inp = stcb->sctp_ep;
5829 #if defined(INET) || defined(INET6)
5830                         if ((net != NULL) && (port != 0)) {
5831                                 if (net->port == 0) {
5832                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5833                                 }
5834                                 net->port = port;
5835                         }
5836 #endif
5837                 }
5838         } else {
5839                 /*
5840                  * no control chunks, so pre-process DATA chunks (these
5841                  * checks are taken care of by control processing)
5842                  */
5843
5844                 /*
5845                  * if DATA only packet, and auth is required, then punt...
5846                  * can't have authenticated without any AUTH (control)
5847                  * chunks
5848                  */
5849                 if ((stcb != NULL) &&
5850                     (stcb->asoc.auth_supported == 1) &&
5851                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5852                         /* "silently" ignore */
5853                         SCTP_STAT_INCR(sctps_recvauthmissing);
5854                         goto out;
5855                 }
5856                 if (stcb == NULL) {
5857                         /* out of the blue DATA chunk */
5858                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5859                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5860                             msg);
5861                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5862                             mflowtype, mflowid, fibnum,
5863                             vrf_id, port);
5864                         goto out;
5865                 }
5866                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5867                         /* v_tag mismatch! */
5868                         SCTP_STAT_INCR(sctps_badvtag);
5869                         goto out;
5870                 }
5871         }
5872
5873         if (stcb == NULL) {
5874                 /*
5875                  * no valid TCB for this packet, or we found it's a bad
5876                  * packet while processing control, or we're done with this
5877                  * packet (done or skip rest of data), so we drop it...
5878                  */
5879                 goto out;
5880         }
5881         /*
5882          * DATA chunk processing
5883          */
5884         /* plow through the data chunks while length > offset */
5885
5886         /*
5887          * Rest should be DATA only.  Check authentication state if AUTH for
5888          * DATA is required.
5889          */
5890         if ((length > offset) &&
5891             (stcb != NULL) &&
5892             (stcb->asoc.auth_supported == 1) &&
5893             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5894             !stcb->asoc.authenticated) {
5895                 /* "silently" ignore */
5896                 SCTP_STAT_INCR(sctps_recvauthmissing);
5897                 SCTPDBG(SCTP_DEBUG_AUTH1,
5898                     "Data chunk requires AUTH, skipped\n");
5899                 goto trigger_send;
5900         }
5901         if (length > offset) {
5902                 int retval;
5903
5904                 /*
5905                  * First check to make sure our state is correct. We would
5906                  * not get here unless we really did have a tag, so we don't
5907                  * abort if this happens, just dump the chunk silently.
5908                  */
5909                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5910                 case SCTP_STATE_COOKIE_ECHOED:
5911                         /*
5912                          * we consider data with valid tags in this state
5913                          * shows us the cookie-ack was lost. Imply it was
5914                          * there.
5915                          */
5916                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5917                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5918                                     stcb->asoc.overall_error_count,
5919                                     0,
5920                                     SCTP_FROM_SCTP_INPUT,
5921                                     __LINE__);
5922                         }
5923                         stcb->asoc.overall_error_count = 0;
5924                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5925                         break;
5926                 case SCTP_STATE_COOKIE_WAIT:
5927                         /*
5928                          * We consider OOTB any data sent during asoc setup.
5929                          */
5930                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5931                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5932                             msg);
5933                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5934                             mflowtype, mflowid, inp->fibnum,
5935                             vrf_id, port);
5936                         goto out;
5937                         /* sa_ignore NOTREACHED */
5938                         break;
5939                 case SCTP_STATE_EMPTY:  /* should not happen */
5940                 case SCTP_STATE_INUSE:  /* should not happen */
5941                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5942                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5943                 default:
5944                         goto out;
5945                         /* sa_ignore NOTREACHED */
5946                         break;
5947                 case SCTP_STATE_OPEN:
5948                 case SCTP_STATE_SHUTDOWN_SENT:
5949                         break;
5950                 }
5951                 /* plow through the data chunks while length > offset */
5952                 retval = sctp_process_data(mm, iphlen, &offset, length,
5953                     inp, stcb, net, &high_tsn);
5954                 if (retval == 2) {
5955                         /*
5956                          * The association aborted, NO UNLOCK needed since
5957                          * the association is destroyed.
5958                          */
5959                         stcb = NULL;
5960                         goto out;
5961                 }
5962                 data_processed = 1;
5963                 /*
5964                  * Anything important needs to have been m_copy'ed in
5965                  * process_data
5966                  */
5967         }
5968         /* take care of ecn */
5969         if ((data_processed == 1) &&
5970             (stcb->asoc.ecn_supported == 1) &&
5971             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5972                 /* Yep, we need to add a ECNE */
5973                 sctp_send_ecn_echo(stcb, net, high_tsn);
5974         }
5975         if ((data_processed == 0) && (fwd_tsn_seen)) {
5976                 int was_a_gap;
5977                 uint32_t highest_tsn;
5978
5979                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5980                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5981                 } else {
5982                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5983                 }
5984                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5985                 stcb->asoc.send_sack = 1;
5986                 sctp_sack_check(stcb, was_a_gap);
5987         } else if (fwd_tsn_seen) {
5988                 stcb->asoc.send_sack = 1;
5989         }
5990         /* trigger send of any chunks in queue... */
5991 trigger_send:
5992 #ifdef SCTP_AUDITING_ENABLED
5993         sctp_audit_log(0xE0, 2);
5994         sctp_auditing(1, inp, stcb, net);
5995 #endif
5996         SCTPDBG(SCTP_DEBUG_INPUT1,
5997             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5998             stcb->asoc.peers_rwnd,
5999             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6000             stcb->asoc.total_flight);
6001         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6002         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6003                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6004         }
6005         if (cnt_ctrl_ready || stcb->asoc.trigger_reset ||
6006             ((un_sent) &&
6007             (stcb->asoc.peers_rwnd > 0 ||
6008             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6009                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6010                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6011                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6012         }
6013 #ifdef SCTP_AUDITING_ENABLED
6014         sctp_audit_log(0xE0, 3);
6015         sctp_auditing(2, inp, stcb, net);
6016 #endif
6017 out:
6018         if (stcb != NULL) {
6019                 SCTP_TCB_UNLOCK(stcb);
6020         }
6021         if (inp_decr != NULL) {
6022                 /* reduce ref-count */
6023                 SCTP_INP_WLOCK(inp_decr);
6024                 SCTP_INP_DECR_REF(inp_decr);
6025                 SCTP_INP_WUNLOCK(inp_decr);
6026         }
6027         return;
6028 }
6029
6030 #ifdef INET
6031 void
6032 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6033 {
6034         struct mbuf *m;
6035         int iphlen;
6036         uint32_t vrf_id = 0;
6037         uint8_t ecn_bits;
6038         struct sockaddr_in src, dst;
6039         struct ip *ip;
6040         struct sctphdr *sh;
6041         struct sctp_chunkhdr *ch;
6042         int length, offset;
6043
6044 #if !defined(SCTP_WITH_NO_CSUM)
6045         uint8_t compute_crc;
6046
6047 #endif
6048         uint32_t mflowid;
6049         uint8_t mflowtype;
6050         uint16_t fibnum;
6051
6052         iphlen = off;
6053         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6054                 SCTP_RELEASE_PKT(i_pak);
6055                 return;
6056         }
6057         m = SCTP_HEADER_TO_CHAIN(i_pak);
6058 #ifdef SCTP_MBUF_LOGGING
6059         /* Log in any input mbufs */
6060         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6061                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6062         }
6063 #endif
6064 #ifdef SCTP_PACKET_LOGGING
6065         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6066                 sctp_packet_log(m);
6067         }
6068 #endif
6069         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6070             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6071             m->m_pkthdr.len,
6072             if_name(m->m_pkthdr.rcvif),
6073             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6074         mflowid = m->m_pkthdr.flowid;
6075         mflowtype = M_HASHTYPE_GET(m);
6076         fibnum = M_GETFIB(m);
6077         SCTP_STAT_INCR(sctps_recvpackets);
6078         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6079         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6080         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6081         if (SCTP_BUF_LEN(m) < offset) {
6082                 if ((m = m_pullup(m, offset)) == NULL) {
6083                         SCTP_STAT_INCR(sctps_hdrops);
6084                         return;
6085                 }
6086         }
6087         ip = mtod(m, struct ip *);
6088         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6089         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6090         offset -= sizeof(struct sctp_chunkhdr);
6091         memset(&src, 0, sizeof(struct sockaddr_in));
6092         src.sin_family = AF_INET;
6093         src.sin_len = sizeof(struct sockaddr_in);
6094         src.sin_port = sh->src_port;
6095         src.sin_addr = ip->ip_src;
6096         memset(&dst, 0, sizeof(struct sockaddr_in));
6097         dst.sin_family = AF_INET;
6098         dst.sin_len = sizeof(struct sockaddr_in);
6099         dst.sin_port = sh->dest_port;
6100         dst.sin_addr = ip->ip_dst;
6101         length = ntohs(ip->ip_len);
6102         /* Validate mbuf chain length with IP payload length. */
6103         if (SCTP_HEADER_LEN(m) != length) {
6104                 SCTPDBG(SCTP_DEBUG_INPUT1,
6105                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6106                 SCTP_STAT_INCR(sctps_hdrops);
6107                 goto out;
6108         }
6109         /* SCTP does not allow broadcasts or multicasts */
6110         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6111                 goto out;
6112         }
6113         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6114                 goto out;
6115         }
6116         ecn_bits = ip->ip_tos;
6117 #if defined(SCTP_WITH_NO_CSUM)
6118         SCTP_STAT_INCR(sctps_recvnocrc);
6119 #else
6120         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6121                 SCTP_STAT_INCR(sctps_recvhwcrc);
6122                 compute_crc = 0;
6123         } else {
6124                 SCTP_STAT_INCR(sctps_recvswcrc);
6125                 compute_crc = 1;
6126         }
6127 #endif
6128         sctp_common_input_processing(&m, iphlen, offset, length,
6129             (struct sockaddr *)&src,
6130             (struct sockaddr *)&dst,
6131             sh, ch,
6132 #if !defined(SCTP_WITH_NO_CSUM)
6133             compute_crc,
6134 #endif
6135             ecn_bits,
6136             mflowtype, mflowid, fibnum,
6137             vrf_id, port);
6138 out:
6139         if (m) {
6140                 sctp_m_freem(m);
6141         }
6142         return;
6143 }
6144
6145 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6146 extern int *sctp_cpuarry;
6147
6148 #endif
6149
6150 int
6151 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6152 {
6153         struct mbuf *m;
6154         int off;
6155
6156         m = *mp;
6157         off = *offp;
6158 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6159         if (mp_ncpus > 1) {
6160                 struct ip *ip;
6161                 struct sctphdr *sh;
6162                 int offset;
6163                 int cpu_to_use;
6164                 uint32_t flowid, tag;
6165
6166                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6167                         flowid = m->m_pkthdr.flowid;
6168                 } else {
6169                         /*
6170                          * No flow id built by lower layers fix it so we
6171                          * create one.
6172                          */
6173                         offset = off + sizeof(struct sctphdr);
6174                         if (SCTP_BUF_LEN(m) < offset) {
6175                                 if ((m = m_pullup(m, offset)) == NULL) {
6176                                         SCTP_STAT_INCR(sctps_hdrops);
6177                                         return (IPPROTO_DONE);
6178                                 }
6179                         }
6180                         ip = mtod(m, struct ip *);
6181                         sh = (struct sctphdr *)((caddr_t)ip + off);
6182                         tag = htonl(sh->v_tag);
6183                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6184                         m->m_pkthdr.flowid = flowid;
6185                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6186                 }
6187                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6188                 sctp_queue_to_mcore(m, off, cpu_to_use);
6189                 return (IPPROTO_DONE);
6190         }
6191 #endif
6192         sctp_input_with_port(m, off, 0);
6193         return (IPPROTO_DONE);
6194 }
6195
6196 #endif